/* roulang page: index */
:root{
  --ink-900:#0A0C0B;
  --ink-800:#121614;
  --ink-700:#1A1F1C;
  --line:rgba(198,242,78,0.14);
  --line-strong:rgba(198,242,78,0.45);
  --neon:#C6F24E;
  --neon-dim:#9CC63A;
  --violet:#7A6BFF;
  --txt:#E8EDE6;
  --txt-2:#9AA39C;
  --txt-3:#5E6660;
  --ok:#4ADE80;
  --warn:#FF8A4C;
  --err:#FF6B6B;
  --r-card:18px;
  --r-sm:12px;
  --r-btn:14px;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  background:var(--ink-900);
  color:var(--txt);
  font-family:'PingFang SC','HarmonyOS Sans SC','Noto Sans SC','Microsoft YaHei',-apple-system,sans-serif;
  font-size:1.0625rem;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
input,textarea{font:inherit}
ul,ol{list-style:none}
:focus-visible{outline:2px solid var(--neon);outline-offset:2px;border-radius:4px}

.wrap{width:100%;max-width:1240px;margin:0 auto;padding:0 20px}
@media (min-width:640px){.wrap{padding:0 32px}}
@media (min-width:1024px){.wrap{padding:0 48px}}

.sec{padding:56px 0}
@media (min-width:1024px){.sec{padding:96px 0}}
.sec-alt{background:linear-gradient(180deg,rgba(26,31,28,0) 0%,rgba(18,22,20,.9) 18%,rgba(18,22,20,.9) 82%,rgba(26,31,28,0) 100%)}

.eyebrow{
  font-family:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:.8125rem;letter-spacing:.18em;text-transform:uppercase;
  color:var(--neon);opacity:.85;margin-bottom:14px;
}
h1,h2,h3{line-height:1.2;font-weight:700;letter-spacing:-.01em}
h2{font-size:clamp(1.5rem,2.4vw,2.25rem);font-weight:700}
h3{font-size:1.375rem;font-weight:600;line-height:1.35}
.lead{color:var(--txt-2);max-width:760px}

.sec-head{display:flex;flex-wrap:wrap;gap:18px;align-items:flex-end;justify-content:space-between;margin-bottom:40px}
.sec-head p{color:var(--txt-2);font-size:.9375rem;margin-top:10px;max-width:640px}

/* ---------- 导航 ---------- */
.site-header{position:fixed;top:0;left:0;right:0;z-index:80;height:68px;transition:background .3s var(--ease),border-color .3s var(--ease),backdrop-filter .3s var(--ease);border-bottom:1px solid transparent}
.site-header.is-scrolled{background:rgba(10,12,11,.86);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.site-header.is-scrolled::after{content:'';position:absolute;left:0;bottom:-1px;height:1px;width:100%;background:linear-gradient(90deg,var(--neon),rgba(198,242,78,0) 62%)}
.nav-inner{height:68px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.logo{display:flex;align-items:center;gap:10px;font-size:1.0625rem;font-weight:800;letter-spacing:-.02em;white-space:nowrap}
.logo-mark{width:26px;height:26px;border-radius:8px;background:linear-gradient(135deg,var(--neon),var(--neon-dim));display:grid;place-items:center;color:#0A0C0B;font-size:.75rem;font-weight:800;font-family:'JetBrains Mono',ui-monospace,monospace}
.logo em{font-style:normal;color:var(--neon)}
.nav-links{display:none;align-items:center;gap:26px}
@media (min-width:1024px){.nav-links{display:flex}}
.nav-link{position:relative;font-size:15px;color:var(--txt-2);padding:8px 0;transition:color .2s var(--ease);white-space:nowrap}
.nav-link::after{content:'';position:absolute;left:50%;bottom:0;width:16px;height:2px;background:var(--neon);transform:translateX(-50%) scaleX(0);transform-origin:center;transition:transform .24s var(--ease)}
.nav-link:hover{color:var(--txt)}
.nav-link:hover::after{transform:translateX(-50%) scaleX(1)}
.nav-link.active{color:var(--neon);text-shadow:0 0 12px rgba(198,242,78,.45)}
.nav-link.active::after{transform:translateX(-50%) scaleX(1)}
.nav-actions{display:flex;align-items:center;gap:12px}
.nav-cta{display:none}
@media (min-width:1024px){.nav-cta{display:inline-flex}}
.burger{width:44px;height:44px;border:1px solid var(--line);border-radius:12px;display:grid;place-items:center;gap:5px;padding:12px}
@media (min-width:1024px){.burger{display:none}}
.burger span{display:block;width:18px;height:2px;background:var(--txt);border-radius:2px;transition:transform .24s var(--ease),opacity .24s var(--ease)}
.burger.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger.is-open span:nth-child(2){opacity:0}
.burger.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

.drawer{position:fixed;inset:68px 0 0 0;z-index:79;background:rgba(10,12,11,.98);backdrop-filter:blur(14px);padding:28px 20px 40px;display:none;flex-direction:column;gap:6px;overflow-y:auto}
.drawer.is-open{display:flex}
.drawer a{font-size:18px;color:var(--txt-2);padding:16px 4px;border-bottom:1px solid rgba(198,242,78,.08);opacity:0;transform:translateY(10px);animation:drawerIn .4s var(--ease) forwards}
.drawer a.active{color:var(--neon)}
.drawer a:nth-child(1){animation-delay:.04s}
.drawer a:nth-child(2){animation-delay:.1s}
.drawer a:nth-child(3){animation-delay:.16s}
.drawer a:nth-child(4){animation-delay:.22s}
.drawer a:nth-child(5){animation-delay:.28s}
.drawer .btn{margin-top:22px;animation:drawerIn .4s var(--ease) .34s forwards;opacity:0}
@keyframes drawerIn{to{opacity:1;transform:translateY(0)}}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 24px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;letter-spacing:.01em;
  transition:transform .24s var(--ease),background .24s var(--ease),color .24s var(--ease),border-color .24s var(--ease),box-shadow .24s var(--ease);
  border:1px solid transparent;
}
.btn-primary{background:var(--neon);color:#0A0C0B;border-color:var(--neon)}
.btn-primary:hover{background:transparent;color:var(--neon);transform:translateY(-2px);box-shadow:0 0 24px rgba(198,242,78,.22)}
.btn-ghost{border-color:var(--line);color:var(--txt);background:transparent}
.btn-ghost:hover{border-color:var(--line-strong);color:var(--neon);transform:translateY(-2px);box-shadow:0 0 24px rgba(198,242,78,.18)}
.btn-soft{background:rgba(198,242,78,.10);color:var(--neon);border-color:rgba(198,242,78,.20)}
.btn-soft:hover{background:rgba(198,242,78,.18);transform:translateY(-2px)}
.btn:active{transform:translateY(1px)}
.btn[disabled],.btn.is-disabled{opacity:.4;pointer-events:none}

.link-arrow{display:inline-flex;align-items:center;gap:8px;font-size:15px;font-weight:600;color:var(--neon)}
.link-arrow span{transition:transform .24s var(--ease)}
.link-arrow:hover span{transform:translateX(4px)}

.badge{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 14px;border-radius:999px;
  background:rgba(198,242,78,.10);border:1px solid rgba(198,242,78,.20);
  color:var(--neon);font-size:.8125rem;font-weight:600;letter-spacing:.02em;
}
.badge-violet{background:rgba(122,107,255,.12);border-color:rgba(122,107,255,.28);color:#B0A6FF}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;padding-top:124px;padding-bottom:64px;background:radial-gradient(circle at 80% 12%,rgba(198,242,78,.10),transparent 52%),radial-gradient(circle at 8% 82%,rgba(122,107,255,.08),transparent 48%),var(--ink-900)}
@media (min-width:1024px){.hero{padding-top:168px;padding-bottom:104px}}
.hero::before{
  content:'';position:absolute;inset:0;pointer-events:none;opacity:.05;
  background-image:linear-gradient(rgba(198,242,78,1) 1px,transparent 1px),linear-gradient(90deg,rgba(198,242,78,1) 1px,transparent 1px);
  background-size:24px 24px;
}
.hero-grid{position:relative;display:grid;gap:44px}
@media (min-width:1024px){.hero-grid{grid-template-columns:7fr 5fr;gap:56px;align-items:center}}
.hero-title{font-size:clamp(2rem,4.2vw,3.75rem);line-height:1.08;font-weight:800;letter-spacing:-.02em;margin:20px 0 18px;max-width:13em}
.hero-sub{font-size:1.0625rem;color:var(--txt-2);max-width:22em;margin-bottom:30px}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px}
.hero-metrics{display:flex;flex-wrap:wrap;gap:34px;margin-top:42px;padding-top:26px;border-top:1px solid var(--line)}
.metric{display:flex;flex-direction:column;gap:2px}
.metric-num{font-family:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,monospace;font-size:1.75rem;font-weight:700;color:var(--neon);line-height:1.1}
.metric-txt{font-size:.8125rem;color:var(--txt-3)}

.hero-visual{position:relative;border-radius:var(--r-card);border:1px solid var(--line);background:var(--ink-800);overflow:visible}
.hero-figure{position:relative;border-radius:calc(var(--r-card) - 1px);overflow:hidden;aspect-ratio:16/11}
.hero-figure img{width:100%;height:100%;object-fit:cover}
.hero-figure::after{content:'';position:absolute;inset:0;background:linear-gradient(180deg,rgba(10,12,11,.10),rgba(10,12,11,.72))}
.float-card{position:absolute;background:var(--ink-700);border:1px solid var(--line);border-radius:var(--r-sm);padding:14px 16px;min-width:158px}
.float-card .fc-label{font-size:.75rem;color:var(--txt-3);letter-spacing:.08em;text-transform:uppercase;font-family:'JetBrains Mono',ui-monospace,monospace}
.float-card .fc-value{font-size:1.375rem;font-weight:700;color:var(--neon);font-family:'JetBrains Mono',ui-monospace,monospace;line-height:1.3}
.float-card .fc-note{font-size:.8125rem;color:var(--txt-2)}
.fc-1{left:-14px;bottom:34px}
.fc-2{right:-10px;top:-22px}
@media (max-width:520px){.fc-1{left:8px;bottom:12px}.fc-2{right:8px;top:-16px}}

/* ---------- 卖点阶梯 ---------- */
.stair{display:grid;gap:24px}
@media (min-width:640px){.stair{grid-template-columns:repeat(2,1fr)}}
@media (min-width:1024px){.stair{grid-template-columns:repeat(6,1fr)}}
.stair-big{grid-column:span 1}
@media (min-width:1024px){.stair-big{grid-column:span 3}}
@media (min-width:640px) and (max-width:1023px){.stair-big{grid-column:span 2}}
.stair-item{grid-column:span 1}
@media (min-width:1024px){
  .stair-item{grid-column:span 3}
  .stair-offset{margin-top:32px}
}
.card{background:var(--ink-800);border:1px solid var(--line);border-radius:var(--r-card);padding:24px;transition:transform .28s var(--ease),border-color .28s var(--ease),box-shadow .28s var(--ease)}
.card:hover{transform:translateY(-3px);border-color:var(--line-strong);box-shadow:0 0 24px rgba(198,242,78,.18)}
.card-title{font-size:1.25rem;font-weight:600;margin-bottom:10px}
.card-text{font-size:.9375rem;color:var(--txt-2);line-height:1.7}
.card-media{border-radius:var(--r-sm);overflow:hidden;aspect-ratio:16/9;margin-bottom:20px}
.card-media img{width:100%;height:100%;object-fit:cover;transition:transform .5s var(--ease)}
.card:hover .card-media img{transform:scale(1.03)}
.ticks{display:grid;gap:10px;margin-top:18px}
.ticks li{display:flex;gap:10px;font-size:.9375rem;color:var(--txt-2);align-items:flex-start}
.ticks li::before{content:'';width:6px;height:6px;border-radius:2px;background:var(--neon);margin-top:10px;flex:0 0 6px}
.stair-num{font-family:'JetBrains Mono',ui-monospace,monospace;font-size:.8125rem;color:var(--neon);opacity:.6;letter-spacing:.12em}

/* ---------- 场景 tab ---------- */
.tabs{display:flex;gap:10px;overflow-x:auto;padding-bottom:6px;margin-bottom:32px;scrollbar-width:none}
.tabs::-webkit-scrollbar{display:none}
.tab{flex:0 0 auto;padding:10px 20px;border-radius:999px;border:1px solid var(--line);background:transparent;color:var(--txt-2);font-size:.9375rem;font-weight:600;transition:all .24s var(--ease);white-space:nowrap}
.tab:hover{border-color:var(--line-strong);color:var(--txt)}
.tab.is-active{background:var(--neon);color:#0A0C0B;border-color:var(--neon)}
.scene{display:grid;gap:32px}
@media (min-width:1024px){.scene{grid-template-columns:8fr 4fr;gap:40px;align-items:center}}
.scene-media{position:relative;border-radius:var(--r-card);overflow:hidden;border:1px solid var(--line);aspect-ratio:16/10}
.scene-media img{width:100%;height:100%;object-fit:cover}
.scene-tag{position:absolute;left:16px;bottom:16px;background:rgba(10,12,11,.88);border:1px solid var(--line);border-radius:var(--r-sm);padding:8px 14px;font-size:.8125rem;color:var(--txt-2)}
.scene-list{display:grid;gap:18px;margin:22px 0 26px}
.scene-list li{display:flex;gap:12px;font-size:.9375rem;color:var(--txt-2);line-height:1.7}
.scene-list li b{color:var(--txt);font-weight:600}
.scene-list li span{flex:0 0 22px;font-family:'JetBrains Mono',ui-monospace,monospace;color:var(--neon);opacity:.75}
.panel{display:none}
.panel.is-active{display:block}

/* ---------- 能力清单 ---------- */
.cap-list{border-top:1px solid var(--line)}
.cap-row{display:grid;gap:8px;padding:24px 0;border-bottom:1px solid var(--line);transition:transform .24s var(--ease);position:relative}
@media (min-width:768px){.cap-row{grid-template-columns:80px 1fr 1.1fr;gap:24px;align-items:baseline;padding:28px 0}}
.cap-row::before{content:'';position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--neon);transform:scaleY(0);transform-origin:top;transition:transform .24s var(--ease)}
.cap-row:hover::before{transform:scaleY(1)}
.cap-row:hover{transform:translateX(6px)}
.cap-num{font-family:'JetBrains Mono',ui-monospace,monospace;font-size:1.0625rem;color:var(--neon);opacity:.6;letter-spacing:.08em}
.cap-row h3{font-size:1.125rem}
.cap-row p{font-size:.9375rem;color:var(--txt-2)}

/* ---------- 社会认同 ---------- */
.stats{display:grid;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden}
@media (min-width:640px){.stats{grid-template-columns:repeat(2,1fr)}}
@media (min-width:1024px){.stats{grid-template-columns:repeat(4,1fr)}}
.stat{background:var(--ink-800);padding:28px 24px}
.stat-num{font-family:'JetBrains Mono',ui-monospace,monospace;font-size:clamp(2rem,3vw,2.75rem);font-weight:700;color:var(--neon);line-height:1.15}
.stat-name{font-size:.9375rem;color:var(--txt);margin-top:6px;font-weight:600}
.stat-note{font-size:.8125rem;color:var(--txt-3);margin-top:4px}
.logos{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:36px}
@media (min-width:640px){.logos{grid-template-columns:repeat(3,1fr)}}
@media (min-width:1024px){.logos{grid-template-columns:repeat(6,1fr)}}
.logo-chip{display:grid;place-items:center;height:72px;border:1px solid var(--line);border-radius:var(--r-sm);background:var(--ink-800);color:var(--txt-3);font-size:.9375rem;font-weight:600;filter:grayscale(1);transition:all .28s var(--ease)}
.logo-chip:hover{filter:grayscale(0);color:var(--txt);border-color:var(--line-strong);box-shadow:0 0 24px rgba(198,242,78,.16)}
.quotes{display:grid;gap:24px;margin-top:36px}
@media (min-width:1024px){.quotes{grid-template-columns:repeat(3,1fr)}}
.quote{position:relative;padding-left:30px}
.quote::before{content:'“';position:absolute;left:0;top:-6px;font-size:2.5rem;line-height:1;color:var(--neon);opacity:.5;font-family:Georgia,serif}
.quote p{font-size:.9375rem;color:var(--txt-2);line-height:1.75}
.quote-meta{display:flex;align-items:center;gap:12px;margin-top:18px}
.avatar{width:40px;height:40px;border-radius:999px;background:linear-gradient(135deg,rgba(198,242,78,.35),rgba(122,107,255,.35));border:1px solid var(--line);flex:0 0 40px}
.quote-meta b{display:block;font-size:.9375rem;font-weight:600}
.quote-meta em{font-style:normal;font-size:.8125rem;color:var(--txt-3)}

/* ---------- 最新信息 ---------- */
.latest-grid{display:grid;gap:24px}
@media (min-width:1024px){.latest-grid{grid-template-columns:5fr 7fr;gap:28px}}
.latest-side{display:grid;gap:20px}
.card-lead{padding:0;overflow:hidden;display:flex;flex-direction:column}
.card-lead .lead-media{aspect-ratio:16/9;overflow:hidden}
.card-lead .lead-media img{width:100%;height:100%;object-fit:cover;transition:transform .5s var(--ease)}
.card-lead:hover .lead-media img{transform:scale(1.03)}
.card-lead .lead-body{padding:24px}
.card-compact{display:grid;gap:16px;grid-template-columns:132px 1fr;align-items:center;padding:16px}
.card-compact .mini-media{aspect-ratio:16/11;border-radius:var(--r-sm);overflow:hidden}
.card-compact .mini-media img{width:100%;height:100%;object-fit:cover}
.card-compact h3{font-size:1.0625rem;line-height:1.45;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card-compact p{font-size:.875rem;color:var(--txt-2);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card-meta{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-size:.8125rem;color:var(--txt-3);margin-top:14px}
.tag-mini{padding:3px 10px;border-radius:999px;background:rgba(122,107,255,.12);border:1px solid rgba(122,107,255,.26);color:#B0A6FF;font-size:.75rem}
.card-meta .dot{width:3px;height:3px;border-radius:999px;background:var(--txt-3)}
.empty-state{border:1px dashed var(--line);border-radius:var(--r-card);padding:56px 24px;text-align:center;background:var(--ink-800)}
.empty-icon{width:52px;height:52px;margin:0 auto 16px;border-radius:14px;border:1px solid var(--line);display:grid;place-items:center;color:var(--neon);font-family:'JetBrains Mono',ui-monospace,monospace;font-size:1.25rem}
.empty-state p{color:var(--txt-2);margin-bottom:20px}

/* ---------- FAQ ---------- */
.faq{border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:18px;padding:22px 4px;text-align:left;font-size:1.0625rem;font-weight:600;color:var(--txt);transition:color .24s var(--ease)}
.faq-q:hover{color:var(--neon)}
.faq-icon{position:relative;width:16px;height:16px;flex:0 0 16px}
.faq-icon::before,.faq-icon::after{content:'';position:absolute;background:var(--neon);border-radius:2px;transition:transform .24s var(--ease)}
.faq-icon::before{left:0;top:7px;width:16px;height:2px}
.faq-icon::after{left:7px;top:0;width:2px;height:16px}
.faq-item.is-open .faq-icon::after{transform:rotate(90deg) scaleY(0)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .24s var(--ease)}
.faq-a p{font-size:.9375rem;color:var(--txt-2);line-height:1.8;padding:0 46px 24px 4px}

/* ---------- CTA ---------- */
.cta-band{position:relative;overflow:hidden;border:1px solid var(--line);border-radius:var(--r-card);background:var(--ink-800);padding:44px 28px;text-align:center}
@media (min-width:1024px){.cta-band{padding:64px 56px}}
.cta-band::before{content:'';position:absolute;left:-20%;top:-60%;width:150%;height:180%;transform:rotate(-45deg);background:linear-gradient(90deg,rgba(198,242,78,0) 0%,rgba(198,242,78,.08) 45%,rgba(198,242,78,0) 100%);pointer-events:none}
.cta-band h2{margin-bottom:16px;position:relative}
.cta-band p{color:var(--txt-2);max-width:560px;margin:0 auto 30px;position:relative}
.cta-band .btn{position:relative}

/* ---------- 页脚 ---------- */
.site-footer{border-top:1px solid var(--line);background:var(--ink-900);padding:56px 0 30px;margin-top:8px}
.footer-grid{display:grid;gap:34px}
@media (min-width:640px){.footer-grid{grid-template-columns:repeat(2,1fr)}}
@media (min-width:1024px){.footer-grid{grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:40px}}
.footer-col h4{font-size:.9375rem;font-weight:700;margin-bottom:16px;color:var(--txt)}
.footer-col p{font-size:.875rem;color:var(--txt-2);line-height:1.8;max-width:34ch}
.footer-col li{margin-bottom:10px}
.footer-col a{font-size:.875rem;color:var(--txt-2);transition:color .2s var(--ease)}
.footer-col a:hover{color:var(--neon)}
.footer-bottom{margin-top:40px;padding-top:22px;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;font-size:.8125rem;color:var(--txt-3)}

/* ---------- 底部转化条 ---------- */
.dock{position:fixed;left:20px;right:20px;bottom:16px;z-index:70;display:none;align-items:center;justify-content:space-between;gap:14px;height:64px;padding:0 14px 0 20px;border-radius:999px;background:rgba(18,22,20,.96);border:1px solid var(--line);backdrop-filter:blur(12px);box-shadow:0 12px 40px rgba(0,0,0,.5)}
.dock.is-visible{display:flex}
.dock-txt{font-size:.9375rem;color:var(--txt)}
.dock-actions{display:flex;align-items:center;gap:8px}
.dock .btn{height:40px;padding:0 18px;font-size:.9375rem}
.dock-close{width:34px;height:34px;border-radius:999px;border:1px solid var(--line);display:grid;place-items:center;color:var(--txt-3);font-size:1rem;line-height:1;transition:all .2s var(--ease)}
.dock-close:hover{color:var(--neon);border-color:var(--line-strong)}
@media (min-width:1024px){
  .dock{left:auto;right:28px;bottom:28px;height:60px;width:auto;max-width:520px;border-radius:999px}
}
@media (max-width:639px){
  .dock{left:0;right:0;bottom:0;border-radius:0;height:64px;border-left:0;border-right:0;border-bottom:0}
}

/* ---------- 动画 ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .48s var(--ease),transform .48s var(--ease)}
.reveal.is-in{opacity:1;transform:translateY(0)}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
  *{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important}
}

/* roulang page: article */
:root{
  --ink-900:#0A0C0B;
  --ink-800:#121614;
  --ink-700:#1A1F1C;
  --line:rgba(198,242,78,0.14);
  --line-strong:rgba(198,242,78,0.45);
  --neon:#C6F24E;
  --neon-dim:#9CC63A;
  --violet:#7A6BFF;
  --txt:#E8EDE6;
  --txt-2:#9AA39C;
  --txt-3:#5E6660;
  --btn-fg:#0A0C0B;
  --ok:#4ADE80;
  --warn:#FF8A4C;
  --err:#FF6B6B;
  --r-card:18px;
  --r-sm:12px;
  --r-btn:14px;
  --maxw:1240px;
  --font:'PingFang SC','HarmonyOS Sans SC','Noto Sans SC','Microsoft YaHei',-apple-system,sans-serif;
  --mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,monospace;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  padding-top:68px;
  background:var(--ink-900);
  color:var(--txt);
  font-family:var(--font);
  font-size:1.0625rem;
  line-height:1.75;
  letter-spacing:.01em;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  background-image:linear-gradient(rgba(198,242,78,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(198,242,78,.045) 1px,transparent 1px);
  background-size:24px 24px;
  pointer-events:none;
  z-index:0;
}
img{max-width:100%;display:block;border:0;}
a{color:inherit;text-decoration:none;transition:color .24s ease;}
button{font-family:inherit;cursor:pointer;border:0;background:none;color:inherit;}
h1,h2,h3,h4{margin:0;font-weight:700;letter-spacing:-0.01em;}
p{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
:focus-visible{outline:2px solid var(--neon);outline-offset:3px;border-radius:4px;}
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding-left:20px;padding-right:20px;position:relative;z-index:1;}
@media (min-width:640px){.wrap{padding-left:32px;padding-right:32px;}}
@media (min-width:1024px){.wrap{padding-left:48px;padding-right:48px;}}

/* ---------- header ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;height:68px;z-index:90;
  display:flex;align-items:center;
  background:transparent;
  border-bottom:1px solid transparent;
  transition:background .3s ease,backdrop-filter .3s ease,border-color .3s ease;
}
.site-header::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;
  background:linear-gradient(90deg,rgba(198,242,78,.75),rgba(198,242,78,0) 62%);
  opacity:0;transition:opacity .3s ease;
}
.site-header.scrolled{background:rgba(10,12,11,.86);backdrop-filter:blur(12px);}
.site-header.scrolled::after{opacity:1;}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;width:100%;}
.logo{display:inline-flex;align-items:center;gap:10px;font-size:17px;font-weight:700;letter-spacing:.01em;color:var(--txt);}
.logo em{font-style:normal;color:var(--neon);}
.logo-mark{
  display:inline-flex;align-items:center;justify-content:center;
  width:30px;height:30px;border-radius:9px;
  background:linear-gradient(140deg,var(--neon),var(--neon-dim));
  color:var(--btn-fg);font-family:var(--mono);font-weight:700;font-size:15px;
}
.nav-links{display:flex;align-items:center;gap:26px;}
.nav-link{
  position:relative;font-size:15px;color:var(--txt-2);
  padding:22px 0;transition:color .24s ease;
}
.nav-link::after{
  content:"";position:absolute;left:50%;bottom:16px;width:0;height:2px;
  transform:translateX(-50%);
  background:var(--neon);border-radius:2px;
  transition:width .24s ease;
}
.nav-link:hover{color:var(--txt);}
.nav-link:hover::after{width:16px;}
.nav-link.active{color:var(--neon);}
.nav-link.active::after{width:100%;box-shadow:0 0 12px rgba(198,242,78,.5);}
.nav-actions{display:flex;align-items:center;gap:14px;}
.burger{display:none;width:42px;height:42px;border-radius:12px;border:1px solid var(--line);align-items:center;justify-content:center;flex-direction:column;gap:5px;}
.burger span{display:block;width:18px;height:2px;background:var(--txt);border-radius:2px;transition:transform .24s ease,opacity .24s ease;}
.burger[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.burger[aria-expanded="true"] span:nth-child(2){opacity:0;}
.burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

@media (max-width:1023px){
  .burger{display:flex;}
  .nav-links{
    position:fixed;inset:0;z-index:-1;
    flex-direction:column;align-items:flex-start;justify-content:flex-start;
    gap:6px;padding:104px 32px 40px;
    background:rgba(10,12,11,.98);
    backdrop-filter:blur(6px);
    opacity:0;visibility:hidden;transform:translateY(-10px);
    transition:opacity .3s ease,transform .3s ease,visibility .3s ease;
  }
  .nav-links.open{opacity:1;visibility:visible;transform:none;}
  .nav-link{font-size:18px;padding:14px 0;width:100%;border-bottom:1px solid rgba(198,242,78,.08);}
  .nav-link::after{display:none;}
  .nav-cta{display:none;}
}
@media (min-width:1024px){
  .nav-links{position:static;opacity:1;visibility:visible;}
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 24px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;white-space:nowrap;
  transition:all .24s cubic-bezier(.22,.61,.36,1);
}
.btn-primary{background:var(--neon);color:var(--btn-fg);box-shadow:0 0 0 rgba(198,242,78,0);}
.btn-primary:hover{background:transparent;color:var(--neon);box-shadow:inset 0 0 0 1px var(--neon),0 0 24px rgba(198,242,78,.18);transform:translateY(-2px);}
.btn-primary:active{transform:translateY(1px);}
.btn-outline{border:1px solid var(--line-strong);color:var(--neon);background:transparent;}
.btn-outline:hover{background:rgba(198,242,78,.08);transform:translateY(-2px);}
.btn-outline:active{transform:translateY(1px);}
.btn-ghost{border:1px solid var(--line);color:var(--txt-2);background:rgba(255,255,255,.02);}
.btn-ghost:hover{color:var(--txt);border-color:var(--line-strong);transform:translateY(-2px);}
.btn[disabled],.btn.is-disabled{opacity:.4;pointer-events:none;}
.link-arrow{display:inline-flex;align-items:center;gap:6px;color:var(--neon);font-size:14px;font-weight:600;}
.link-arrow i{font-style:normal;transition:transform .24s ease;}
.link-arrow:hover i{transform:translateX(4px);}

/* ---------- badge ---------- */
.badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 13px;border-radius:999px;font-size:13px;line-height:1.5;
  background:rgba(198,242,78,.10);color:var(--neon);
  border:1px solid rgba(198,242,78,.22);
}
.badge.violet{background:rgba(122,107,255,.14);color:#B9B1FF;border-color:rgba(122,107,255,.32);}

/* ---------- breadcrumb ---------- */
.crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding-top:28px;padding-bottom:6px;
  font-size:13.5px;color:var(--txt-3);
}
.crumbs a{color:var(--txt-2);}
.crumbs a:hover{color:var(--neon);}
.crumbs .sep{color:var(--txt-3);opacity:.6;}
.crumbs .current{color:var(--txt-3);max-width:340px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}

/* ---------- article head ---------- */
.article-head{padding:26px 0 8px;max-width:820px;}
.article-head h1{
  font-size:clamp(1.75rem,3.6vw,3.1rem);
  line-height:1.12;font-weight:800;letter-spacing:-0.02em;
  margin:16px 0 18px;
}
.article-meta{display:flex;flex-wrap:wrap;align-items:center;gap:14px 22px;font-size:13.5px;color:var(--txt-3);}
.article-meta .dot{width:4px;height:4px;border-radius:50%;background:var(--txt-3);opacity:.6;}
.article-meta strong{color:var(--txt-2);font-weight:500;}

/* ---------- layout ---------- */
.article-layout{
  display:grid;grid-template-columns:minmax(0,1fr);gap:48px;
  padding-top:26px;padding-bottom:8px;
}
@media (min-width:1024px){
  .article-layout{grid-template-columns:minmax(0,1fr) 300px;gap:56px;}
}
.article-main{min-width:0;}
.cover-frame{
  border-radius:14px;overflow:hidden;border:1px solid var(--line);
  background:var(--ink-800);margin-bottom:34px;aspect-ratio:16/8;
}
.cover-frame img{width:100%;height:100%;object-fit:cover;}

/* ---------- article body ---------- */
.article-body{max-width:780px;font-size:1.0625rem;line-height:1.85;color:var(--txt);}
.article-body p{margin:0 0 1.15em;color:var(--txt);}
.article-body h2{
  font-size:clamp(1.35rem,2.2vw,1.85rem);
  line-height:1.28;margin:46px 0 16px;padding-left:14px;
  border-left:3px solid var(--neon);
}
.article-body h3{font-size:1.25rem;line-height:1.4;margin:32px 0 12px;font-weight:600;}
.article-body h4{font-size:1.0625rem;margin:24px 0 10px;color:var(--txt);}
.article-body ul,.article-body ol{margin:0 0 1.3em;padding-left:0;}
.article-body ul li{position:relative;padding-left:20px;margin-bottom:10px;color:var(--txt-2);}
.article-body ul li::before{
  content:"";position:absolute;left:0;top:.72em;width:6px;height:6px;
  background:var(--neon);border-radius:1px;
}
.article-body ol{counter-reset:item;}
.article-body ol li{position:relative;padding-left:34px;margin-bottom:10px;counter-increment:item;color:var(--txt-2);}
.article-body ol li::before{
  content:counter(item,decimal-leading-zero);
  position:absolute;left:0;top:0;font-family:var(--mono);font-size:13px;
  color:var(--neon);opacity:.75;
}
.article-body blockquote{
  margin:26px 0;padding:18px 22px;
  border-left:3px solid var(--violet);border-radius:0 var(--r-sm) var(--r-sm) 0;
  background:var(--ink-800);color:var(--txt-2);
}
.article-body blockquote p:last-child{margin-bottom:0;}
.article-body img{border-radius:14px;margin:24px 0;width:100%;}
.article-body a{color:var(--neon);border-bottom:1px solid rgba(198,242,78,.35);}
.article-body a:hover{border-bottom-color:var(--neon);}
.article-body table{width:100%;border-collapse:collapse;margin:26px 0;font-size:15px;}
.article-body th{
  text-align:left;color:var(--neon);font-weight:600;font-size:14px;
  padding:12px 14px;border-bottom:1px solid var(--line-strong);
}
.article-body td{padding:12px 14px;border-bottom:1px solid var(--line);color:var(--txt-2);}
.article-body code{
  font-family:var(--mono);font-size:13.5px;padding:2px 6px;border-radius:6px;
  background:rgba(198,242,78,.08);color:var(--neon-dim);
}
.article-body pre{
  background:var(--ink-800);border:1px solid var(--line);border-radius:var(--r-sm);
  padding:18px;overflow:auto;margin:24px 0;
}
.article-body pre code{background:none;padding:0;color:var(--txt-2);}
.article-body strong{color:#fff;font-weight:600;}

/* ---------- empty ---------- */
.empty-state{
  max-width:780px;padding:56px 28px;text-align:center;
  background:var(--ink-800);border:1px solid var(--line);border-radius:var(--r-card);
}
.empty-state .mark{
  width:52px;height:52px;margin:0 auto 18px;border-radius:14px;
  display:flex;align-items:center;justify-content:center;
  border:1px dashed var(--line-strong);color:var(--neon);font-family:var(--mono);
}
.empty-state p{color:var(--txt-2);margin-bottom:20px;}

/* ---------- toc ---------- */
.toc-inline{margin:8px 0 28px;}
.toc-inline details{background:var(--ink-800);border:1px solid var(--line);border-radius:var(--r-sm);padding:0 16px;}
.toc-inline summary{
  cursor:pointer;list-style:none;padding:14px 0;font-size:15px;font-weight:600;color:var(--neon);
}
.toc-inline summary::-webkit-details-marker{display:none;}
.toc-inline .toc-list{padding-bottom:14px;}
@media (min-width:1024px){.toc-inline{display:none;}}
.article-side{display:none;}
@media (min-width:1024px){
  .article-side{display:block;}
  .toc-card{
    position:sticky;top:96px;
    background:var(--ink-800);border:1px solid var(--line);
    border-radius:var(--r-card);padding:22px 22px 18px;
  }
  .toc-card h3{font-size:13px;letter-spacing:.14em;color:var(--txt-3);text-transform:uppercase;margin-bottom:14px;font-weight:600;}
}
.toc-list li{margin-bottom:2px;}
.toc-list a{
  display:block;padding:8px 0 8px 12px;font-size:14px;color:var(--txt-2);
  border-left:2px solid transparent;line-height:1.5;
  transition:all .2s ease;
}
.toc-list a:hover{color:var(--txt);}
.toc-list a.h3{padding-left:26px;font-size:13.5px;color:var(--txt-3);}
.toc-list a.current{color:var(--neon);border-left-color:var(--neon);background:rgba(198,242,78,.05);}
.toc-empty{font-size:13.5px;color:var(--txt-3);line-height:1.7;}

/* ---------- tags & nav ---------- */
.article-tail{max-width:780px;margin-top:48px;padding-top:26px;border-top:1px solid var(--line);}
.tag-row{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:26px;}
.post-nav{display:grid;grid-template-columns:1fr;gap:14px;}
@media (min-width:640px){.post-nav{grid-template-columns:1fr 1fr;}}
.post-nav a{
  display:block;padding:18px 20px;border:1px solid var(--line);border-radius:var(--r-sm);
  background:var(--ink-800);transition:all .24s ease;
}
.post-nav a:hover{border-color:var(--line-strong);transform:translateY(-3px);box-shadow:0 0 24px rgba(198,242,78,.12);}
.post-nav span{display:block;font-size:12.5px;color:var(--txt-3);margin-bottom:6px;letter-spacing:.08em;}
.post-nav strong{font-size:15px;font-weight:600;color:var(--txt);}

/* ---------- related ---------- */
.section{padding:72px 0;}
@media (min-width:1024px){.section{padding:96px 0;}}
.section-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:32px;}
.section-head h2{font-size:clamp(1.4rem,2.4vw,2rem);line-height:1.25;}
.section-head p{color:var(--txt-2);font-size:15px;margin-top:10px;max-width:640px;}
.grid-3{display:grid;grid-template-columns:1fr;gap:24px;}
@media (min-width:640px){.grid-3{grid-template-columns:1fr 1fr;}}
@media (min-width:1024px){.grid-3{grid-template-columns:repeat(3,1fr);}}
.card{
  display:flex;flex-direction:column;
  background:var(--ink-800);border:1px solid var(--line);border-radius:var(--r-card);
  padding:22px;transition:all .24s cubic-bezier(.22,.61,.36,1);
}
.card:hover{transform:translateY(-3px);border-color:var(--line-strong);box-shadow:0 0 24px rgba(198,242,78,.14);}
.card .thumb{aspect-ratio:16/9;border-radius:12px;overflow:hidden;margin-bottom:18px;background:var(--ink-700);}
.card .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease;}
.card:hover .thumb img{transform:scale(1.04);}
.card h3{font-size:1.0625rem;line-height:1.45;font-weight:600;margin-bottom:10px;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.card p{font-size:14px;line-height:1.7;color:var(--txt-2);margin-bottom:18px;
  display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;}
.card .meta{margin-top:auto;display:flex;align-items:center;gap:12px;font-size:13px;color:var(--txt-3);}

/* ---------- cta ---------- */
.cta-band{
  position:relative;overflow:hidden;
  background:var(--ink-800);border:1px solid var(--line);border-radius:var(--r-card);
  padding:44px 28px;
}
@media (min-width:1024px){.cta-band{padding:56px 56px;}}
.cta-band::before{
  content:"";position:absolute;top:-60%;right:-10%;width:60%;height:220%;
  background:linear-gradient(45deg,rgba(198,242,78,.08),rgba(198,242,78,0) 70%);
  transform:rotate(0deg);pointer-events:none;
}
.cta-band h2{font-size:clamp(1.4rem,2.6vw,2.1rem);line-height:1.22;margin-bottom:14px;position:relative;}
.cta-band p{color:var(--txt-2);max-width:620px;margin-bottom:26px;position:relative;font-size:15.5px;}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px;position:relative;}

/* ---------- footer ---------- */
.site-footer{
  margin-top:72px;padding:64px 0 28px;
  background:rgba(18,22,20,.6);
  border-top:1px solid var(--line);
}
.footer-grid{display:grid;grid-template-columns:1fr;gap:36px;}
@media (min-width:640px){.footer-grid{grid-template-columns:1fr 1fr;}}
@media (min-width:1024px){.footer-grid{grid-template-columns:1.6fr 1fr 1fr 1fr;gap:48px;}}
.footer-col h4{font-size:14px;color:var(--txt);margin-bottom:16px;letter-spacing:.04em;}
.footer-col p{font-size:14px;line-height:1.8;color:var(--txt-3);max-width:340px;}
.footer-col ul li{margin-bottom:11px;}
.footer-col ul a{font-size:14px;color:var(--txt-2);}
.footer-col ul a:hover{color:var(--neon);}
.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;
  margin-top:44px;padding-top:22px;border-top:1px solid var(--line);
  font-size:13px;color:var(--txt-3);
}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .48s cubic-bezier(.22,.61,.36,1),transform .48s cubic-bezier(.22,.61,.36,1);}
.reveal.in{opacity:1;transform:none;}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition-duration:.01ms!important;}
  html{scroll-behavior:auto;}
  .reveal{opacity:1;transform:none;}
}

/* roulang page: category1 */
:root{
  --ink-900:#0A0C0B;
  --ink-800:#121614;
  --ink-700:#1A1F1C;
  --line:rgba(198,242,78,0.14);
  --line-soft:rgba(232,237,230,0.08);
  --neon:#C6F24E;
  --neon-dim:#9CC63A;
  --violet:#7A6BFF;
  --text:#E8EDE6;
  --text-2:#9AA39C;
  --text-3:#5E6660;
  --ok:#4ADE80;
  --warn:#FF8A4C;
  --err:#FF6B6B;
  --r-card:18px;
  --r-sm:12px;
  --r-btn:14px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:104px}
body.site-body{
  margin:0;
  background:var(--ink-900);
  color:var(--text);
  font-family:'PingFang SC','HarmonyOS Sans SC','Noto Sans SC','Microsoft YaHei',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  font-size:1.0625rem;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{margin:0;font-weight:700;line-height:1.28}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
:focus-visible{outline:2px solid var(--neon);outline-offset:3px}
::selection{background:rgba(198,242,78,.28);color:#0A0C0B}

.wrap{width:100%;max-width:1240px;margin:0 auto;padding-left:20px;padding-right:20px}
@media (min-width:640px){.wrap{padding-left:32px;padding-right:32px}}
@media (min-width:1024px){.wrap{padding-left:48px;padding-right:48px}}

/* ---------- header ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:80;
  height:68px;display:flex;align-items:center;
  transition:background .3s var(--ease),border-color .3s var(--ease);
  border-bottom:1px solid transparent;
}
.site-header::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
  background:linear-gradient(90deg,var(--neon) 0%,rgba(198,242,78,.35) 32%,rgba(198,242,78,0) 78%);
  opacity:0;transition:opacity .3s var(--ease);
}
.site-header.scrolled{background:rgba(10,12,11,.86);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px)}
.site-header.scrolled::after{opacity:1}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;width:100%;height:68px}
.logo{display:inline-flex;align-items:center;gap:10px;font-size:1.0625rem;font-weight:800;letter-spacing:-.01em;color:var(--text)}
.logo-mark{
  width:30px;height:30px;border-radius:10px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--neon),var(--neon-dim));
  color:#0A0C0B;font-size:.9375rem;font-weight:800;line-height:1;
}
.logo em{font-style:normal;color:var(--neon)}
.nav-links{display:flex;align-items:center;gap:4px}
.nav-link{position:relative;padding:10px 12px;font-size:15px;color:var(--text-2);transition:color .24s var(--ease)}
.nav-link::after{
  content:"";position:absolute;left:50%;bottom:2px;width:0;height:2px;border-radius:2px;
  background:var(--neon);transform:translateX(-50%);transition:width .24s var(--ease);
}
.nav-link:hover{color:var(--text)}
.nav-link:hover::after{width:16px}
.nav-link.active{color:var(--neon)}
.nav-link.active::after{width:16px;box-shadow:0 0 12px rgba(198,242,78,.7)}
.nav-actions{display:flex;align-items:center;gap:12px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 24px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;letter-spacing:.01em;white-space:nowrap;
  border:1px solid transparent;cursor:pointer;
  transition:transform .24s var(--ease),background .24s var(--ease),color .24s var(--ease),border-color .24s var(--ease),box-shadow .24s var(--ease);
}
.btn-primary{background:var(--neon);color:#0A0C0B}
.btn-primary:hover{background:transparent;color:var(--neon);border-color:var(--neon);transform:translateY(-2px)}
.btn-primary:active{transform:translateY(1px)}
.btn-ghost{border-color:var(--line);color:var(--text)}
.btn-ghost:hover{border-color:rgba(198,242,78,.45);color:var(--neon);transform:translateY(-2px);box-shadow:0 0 24px rgba(198,242,78,.18)}
.btn-ghost:active{transform:translateY(1px)}
.btn[disabled]{opacity:.4;pointer-events:none}
.burger{
  display:none;width:42px;height:42px;border:1px solid var(--line);border-radius:12px;
  flex-direction:column;align-items:center;justify-content:center;gap:5px;
  transition:border-color .24s var(--ease);
}
.burger span{display:block;width:18px;height:2px;border-radius:2px;background:var(--text);transition:transform .24s var(--ease),opacity .24s var(--ease)}
.burger:hover{border-color:rgba(198,242,78,.45)}
body.nav-open .burger span:nth-child(1){transform:translateY(7px) rotate(45deg)}
body.nav-open .burger span:nth-child(2){opacity:0}
body.nav-open .burger span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ---------- category hero ---------- */
.cat-hero{
  position:relative;overflow:hidden;
  padding:104px 0 30px;
  background:
    linear-gradient(90deg,rgba(10,12,11,.97) 0%,rgba(10,12,11,.80) 52%,rgba(10,12,11,.94) 100%),
    url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
  border-bottom:1px solid var(--line);
}
.cat-hero::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.05;
  background-image:
    repeating-linear-gradient(0deg,rgba(232,237,230,.7) 0 1px,transparent 1px 24px),
    repeating-linear-gradient(90deg,rgba(232,237,230,.7) 0 1px,transparent 1px 24px);
}
.hero-inner{position:relative;z-index:2}
.crumb{display:flex;align-items:center;gap:8px;font-size:.8125rem;color:var(--text-3)}
.crumb a{transition:color .2s var(--ease)}
.crumb a:hover{color:var(--neon)}
.crumb-now{color:var(--text-2)}
.cat-h1{
  margin-top:12px;
  font-size:clamp(1.85rem,3.4vw,2.6rem);
  font-weight:800;letter-spacing:-.02em;line-height:1.14;
}
.cat-h1 span{color:var(--neon)}
.cat-sub{margin-top:10px;color:var(--text-2);font-size:1rem}

/* ---------- sections ---------- */
.sec{padding-top:88px}
.sec-first{padding-top:56px}
.sec-head{max-width:780px;margin-bottom:36px}
.sec-head h2{margin:14px 0 12px;font-size:clamp(1.5rem,2.4vw,2.25rem);letter-spacing:-.01em;line-height:1.22}
.sec-head p{color:var(--text-2);font-size:1rem;line-height:1.75}
.badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 12px;border-radius:999px;
  background:rgba(198,242,78,.10);border:1px solid rgba(198,242,78,.20);
  color:var(--neon);font-size:.8125rem;font-weight:600;letter-spacing:.02em;
}
.badge-violet{background:rgba(122,107,255,.12);border-color:rgba(122,107,255,.30);color:#A79BFF}

/* ---------- category layout ---------- */
.cat-layout{display:grid;grid-template-columns:260px minmax(0,1fr);gap:40px;align-items:start}
.subnav{
  position:sticky;top:92px;
  background:var(--ink-800);border:1px solid var(--line);border-radius:var(--r-card);
  padding:18px 14px;
}
.subnav-title{
  font-size:.75rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--text-3);padding:0 12px 10px;
}
.subnav a{
  position:relative;display:block;padding:11px 12px 11px 16px;
  font-size:15px;color:var(--text-2);border-radius:10px;
  transition:color .24s var(--ease),background .24s var(--ease),transform .24s var(--ease);
}
.subnav a::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);
  width:3px;height:0;border-radius:3px;background:var(--neon);
  transition:height .24s var(--ease);
}
.subnav a:hover{color:var(--text);background:rgba(198,242,78,.05);transform:translateX(3px)}
.subnav a.active{color:var(--neon);background:rgba(198,242,78,.08)}
.subnav a.active::before{height:20px;box-shadow:0 0 12px rgba(198,242,78,.65)}

.card-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.g-card{
  background:var(--ink-800);border:1px solid var(--line);border-radius:var(--r-card);
  overflow:hidden;height:100%;
  transition:transform .24s var(--ease),border-color .24s var(--ease),box-shadow .24s var(--ease);
}
.g-card:hover{transform:translateY(-3px);border-color:rgba(198,242,78,.45);box-shadow:0 0 24px rgba(198,242,78,.18)}
.g-card-link{display:flex;flex-direction:column;height:100%}
.g-media{margin:12px 12px 0;border-radius:var(--r-sm);overflow:hidden;aspect-ratio:16/9;background:var(--ink-700)}
.g-media img{width:100%;height:100%;object-fit:cover;transition:transform .5s var(--ease)}
.g-card:hover .g-media img{transform:scale(1.03)}
.g-body{display:flex;flex-direction:column;gap:12px;flex:1;padding:20px 24px 26px}
.g-body h3{font-size:1.125rem;font-weight:600;line-height:1.4}
.g-body p{color:var(--text-2);font-size:.9375rem;line-height:1.72}
.link-arrow{
  margin-top:auto;display:inline-flex;align-items:center;gap:6px;
  color:var(--neon);font-size:.875rem;font-weight:600;
}
.link-arrow .arw{transition:transform .24s var(--ease)}
.g-card:hover .link-arrow .arw{transform:translateX(4px)}

.stat-strip{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px;
  margin-top:44px;padding-top:32px;border-top:1px solid var(--line-soft);
}
.stat b{display:block;font-family:var(--mono);font-size:clamp(2rem,3vw,2.6rem);font-weight:700;color:var(--neon);line-height:1.1;letter-spacing:-.02em}
.stat span{display:block;margin-top:6px;color:var(--text-2);font-size:.9375rem}

/* ---------- flow ---------- */
.flow{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:32px}
.flow-item{position:relative;padding-top:22px;border-top:1px solid var(--line-soft)}
.flow-item::before{content:"";position:absolute;top:-1px;left:0;width:36px;height:2px;background:var(--neon)}
.flow-num{font-family:var(--mono);font-size:2rem;font-weight:700;line-height:1;color:var(--neon);opacity:.62}
.flow-item h3{margin:14px 0 8px;font-size:1.125rem;font-weight:600}
.flow-item p{color:var(--text-2);font-size:.9375rem;line-height:1.72}

/* ---------- tips list ---------- */
.tips{border-bottom:1px solid var(--line-soft)}
.tip{
  position:relative;display:grid;grid-template-columns:70px minmax(0,1fr) minmax(0,1.35fr);
  gap:28px;align-items:start;
  padding:24px 0;border-top:1px solid var(--line-soft);
  transition:transform .24s var(--ease);
}
.tip::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:3px;border-radius:3px;
  background:var(--neon);transform:scaleY(0);transform-origin:center;
  transition:transform .24s var(--ease);
}
.tip:hover{transform:translateX(4px)}
.tip:hover::before{transform:scaleY(1)}
.tip-num{font-family:var(--mono);font-weight:700;color:var(--neon);opacity:.62}
.tip h3{font-size:1.0625rem;font-weight:600}
.tip p{color:var(--text-2);font-size:.9375rem;line-height:1.72}

/* ---------- faq ---------- */
.faq{border-bottom:1px solid var(--line-soft);max-width:880px}
.faq-item{border-top:1px solid var(--line-soft)}
.faq-q{
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  width:100%;padding:22px 0;text-align:left;
  font-size:1.0625rem;font-weight:600;color:var(--text);
  transition:color .24s var(--ease);
}
.faq-q:hover{color:var(--neon)}
.faq-ico{position:relative;flex:none;width:16px;height:16px;transition:transform .24s var(--ease)}
.faq-ico::before,.faq-ico::after{
  content:"";position:absolute;left:50%;top:50%;background:var(--neon);border-radius:2px;
  transform:translate(-50%,-50%);
}
.faq-ico::before{width:16px;height:2px}
.faq-ico::after{width:2px;height:16px}
.faq-item.open .faq-ico{transform:rotate(45deg)}
.faq-a{overflow:hidden;max-height:0;opacity:0;transition:max-height .24s var(--ease),opacity .24s var(--ease)}
.faq-item.open .faq-a{opacity:1}
.faq-a p{padding:0 40px 24px 0;color:var(--text-2);font-size:.96875rem;line-height:1.85}

/* ---------- cta ---------- */
.cta-band{
  position:relative;overflow:hidden;
  border:1px solid var(--line);border-radius:20px;
  padding:60px 40px;text-align:center;
  background:
    linear-gradient(180deg,rgba(18,22,20,.94),rgba(18,22,20,.97)),
    url('/assets/images/backpic/back-3.webp') center/cover no-repeat;
}
.cta-light{
  position:absolute;inset:-60% -20%;pointer-events:none;
  background:linear-gradient(45deg,transparent 44%,rgba(198,242,78,.08) 50%,transparent 56%);
}
.cta-inner{position:relative;z-index:2;max-width:720px;margin:0 auto}
.cta-band h2{font-size:clamp(1.5rem,2.4vw,2.25rem);letter-spacing:-.01em;line-height:1.22}
.cta-band p{margin:14px 0 28px;color:var(--text-2);font-size:1rem}

/* ---------- footer ---------- */
.site-footer{margin-top:96px;padding:64px 0 28px;background:var(--ink-800);border-top:1px solid var(--line)}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px}
.footer-col h4{margin-bottom:16px;font-size:1rem;font-weight:600}
.footer-col ul li+li{margin-top:10px}
.footer-col a{color:var(--text-2);font-size:.9375rem;transition:color .2s var(--ease)}
.footer-col a:hover{color:var(--neon)}
.footer-col p{max-width:340px;color:var(--text-2);font-size:.9375rem;line-height:1.75}
.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;
  margin-top:48px;padding-top:22px;border-top:1px solid var(--line);
  color:var(--text-3);font-size:.8125rem;
}

/* ---------- motion ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .48s var(--ease),transform .48s var(--ease)}
.reveal.in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:1279px){
  .cat-layout{gap:32px}
}
@media (max-width:1023px){
  .burger{display:flex}
  .nav-cta{display:none}
  .nav-links{
    position:fixed;left:0;right:0;top:68px;bottom:0;
    flex-direction:column;align-items:stretch;gap:0;
    padding:28px 20px 48px;background:rgba(10,12,11,.98);
    backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
    overflow-y:auto;transform:translateX(100%);
    transition:transform .32s var(--ease);
  }
  .nav-links.is-open{transform:none}
  .nav-link{
    width:100%;padding:16px 4px;font-size:18px;
    border-bottom:1px solid var(--line-soft);
    opacity:0;transform:translateX(16px);transition:opacity .34s var(--ease),transform .34s var(--ease),color .24s var(--ease);
  }
  .nav-links.is-open .nav-link{opacity:1;transform:none}
  .nav-links.is-open .nav-link:nth-child(1){transition-delay:.06s}
  .nav-links.is-open .nav-link:nth-child(2){transition-delay:.12s}
  .nav-links.is-open .nav-link:nth-child(3){transition-delay:.18s}
  .nav-links.is-open .nav-link:nth-child(4){transition-delay:.24s}
  .nav-links.is-open .nav-link:nth-child(5){transition-delay:.30s}
  .nav-link::after{display:none}

  .cat-layout{grid-template-columns:minmax(0,1fr);gap:26px}
  .subnav-wrap{position:static}
  .subnav{
    position:static;display:flex;gap:8px;align-items:center;
    padding:12px;border-radius:var(--r-sm);
    overflow-x:auto;-webkit-overflow-scrolling:touch;
  }
  .subnav-title{display:none}
  .subnav a{
    flex:none;padding:8px 14px;font-size:.875rem;border:1px solid var(--line);
    border-radius:999px;
  }
  .subnav a::before{display:none}
  .subnav a:hover{transform:none}
  .subnav a.active{background:var(--neon);color:#0A0C0B;border-color:var(--neon)}
  .flow{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:767px){
  .card-grid{grid-template-columns:minmax(0,1fr)}
  .stat-strip{grid-template-columns:minmax(0,1fr);gap:20px}
  .tip{grid-template-columns:56px minmax(0,1fr);gap:8px 16px}
  .tip p{grid-column:2}
  .tip:hover{transform:none}
  .faq-a p{padding-right:12px}
  .cta-band{padding:44px 22px}
}
@media (max-width:639px){
  .sec{padding-top:56px}
  .sec-first{padding-top:40px}
  .cat-hero{padding:92px 0 26px}
  .flow{grid-template-columns:minmax(0,1fr);gap:24px}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:32px}
  .site-footer{margin-top:64px;padding:48px 0 24px}
}
@media (max-width:520px){
  .logo{font-size:1rem}
  .btn{height:42px;padding:0 18px;font-size:.9375rem}
}
@media print{
  .site-header,.cta-band,.subnav{display:none}
}

/* roulang page: category2 */
:root{
    --ink-900:#0A0C0B;
    --ink-800:#121614;
    --ink-700:#1A1F1C;
    --line:rgba(198,242,78,0.14);
    --line-strong:rgba(198,242,78,0.45);
    --neon:#C6F24E;
    --neon-dim:#9CC63A;
    --violet:#7A6BFF;
    --txt:#E8EDE6;
    --txt-2:#9AA39C;
    --txt-3:#5E6660;
    --ok:#4ADE80;
    --warn:#FF8A4C;
    --err:#FF6B6B;
    --r-card:18px;
    --r-sm:12px;
    --r-btn:14px;
    --wrap-w:1240px;
    --font:'PingFang SC','HarmonyOS Sans SC','Noto Sans SC','Microsoft YaHei',-apple-system,sans-serif;
    --mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,monospace;
  }

  *,*::before,*::after{box-sizing:border-box}
  html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
  body{
    margin:0;
    padding-top:68px;
    font-family:var(--font);
    font-size:1.0625rem;
    line-height:1.75;
    color:var(--txt);
    background-color:var(--ink-900);
    background-image:
      linear-gradient(rgba(198,242,78,0.035) 1px, transparent 1px),
      linear-gradient(90deg, rgba(198,242,78,0.035) 1px, transparent 1px);
    background-size:24px 24px;
    overflow-x:hidden;
  }
  img{max-width:100%;display:block;height:auto}
  a{color:inherit;text-decoration:none}
  button{font-family:inherit}
  h1,h2,h3,h4{margin:0;letter-spacing:-0.01em}
  p{margin:0 0 1.15em}
  p:last-child{margin-bottom:0}
  ul{margin:0;padding:0;list-style:none}
  :focus-visible{outline:2px solid var(--neon);outline-offset:3px;border-radius:4px}

  .wrap{width:100%;max-width:var(--wrap-w);margin:0 auto;padding-left:20px;padding-right:20px}
  @media (min-width:640px){.wrap{padding-left:32px;padding-right:32px}}
  @media (min-width:1024px){.wrap{padding-left:48px;padding-right:48px}}

  /* ---------- Header ---------- */
  .site-header{
    position:fixed;top:0;left:0;right:0;height:68px;z-index:100;
    transition:background-color .3s ease, backdrop-filter .3s ease;
  }
  .site-header::after{
    content:'';position:absolute;left:0;right:0;bottom:0;height:1px;
    background:linear-gradient(90deg,var(--neon),rgba(198,242,78,0));
    opacity:0;transition:opacity .3s ease;
  }
  .site-header.scrolled{
    background:rgba(10,12,11,.86);
    -webkit-backdrop-filter:blur(12px);
    backdrop-filter:blur(12px);
  }
  .site-header.scrolled::after{opacity:1}
  .nav-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;height:68px}
  .logo{display:inline-flex;align-items:center;gap:10px;font-weight:800;font-size:17px;letter-spacing:-0.02em;color:var(--txt)}
  .logo-mark{
    width:32px;height:32px;flex:0 0 32px;border-radius:10px;
    display:grid;place-items:center;
    background:linear-gradient(135deg,var(--neon),var(--neon-dim));
    color:#0A0C0B;font-size:16px;font-weight:800;font-family:var(--mono);
  }
  .logo em{font-style:normal;color:var(--neon)}
  .nav-links{display:none;align-items:center;gap:28px}
  .nav-link{
    position:relative;font-size:15px;color:var(--txt-2);padding:6px 0;
    transition:color .2s ease;
  }
  .nav-link::after{
    content:'';position:absolute;left:0;bottom:-2px;height:2px;width:16px;border-radius:2px;
    background:var(--neon);transform:scaleX(0);transform-origin:left;
    transition:transform .24s cubic-bezier(.22,.61,.36,1);
  }
  .nav-link:hover{color:var(--txt)}
  .nav-link:hover::after{transform:scaleX(1)}
  .nav-link.active{color:var(--neon)}
  .nav-link.active::after{
    width:100%;transform:scaleX(1);
    box-shadow:0 0 12px rgba(198,242,78,.6);
  }
  .nav-actions{display:flex;align-items:center;gap:12px}
  .burger{
    width:42px;height:42px;border:1px solid var(--line);border-radius:12px;background:transparent;
    display:inline-flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;cursor:pointer;
    transition:border-color .24s ease;
  }
  .burger:hover{border-color:var(--line-strong)}
  .burger span{display:block;width:18px;height:2px;background:var(--txt);border-radius:2px;transition:transform .24s ease,opacity .24s ease}
  .site-header.nav-open .burger span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .site-header.nav-open .burger span:nth-child(2){opacity:0}
  .site-header.nav-open .burger span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

  @media (min-width:1024px){
    .nav-links{display:flex}
    .burger{display:none}
  }
  @media (max-width:1023px){
    .nav-links{
      display:none;position:fixed;top:68px;left:0;right:0;bottom:0;
      flex-direction:column;align-items:stretch;gap:0;
      padding:24px 24px 40px;overflow-y:auto;
      background:rgba(10,12,11,.98);
      -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
    }
    .site-header.nav-open .nav-links{display:flex}
    .nav-link{font-size:18px;width:100%;padding:14px 0;border-bottom:1px solid var(--line)}
    .nav-link::after{display:none}
    .nav-link.active::after{display:block;width:28px;bottom:8px}
    .site-header.nav-open .nav-link{animation:fadeUp .48s cubic-bezier(.22,.61,.36,1) both}
    .site-header.nav-open .nav-link:nth-child(1){animation-delay:.04s}
    .site-header.nav-open .nav-link:nth-child(2){animation-delay:.12s}
    .site-header.nav-open .nav-link:nth-child(3){animation-delay:.20s}
    .site-header.nav-open .nav-link:nth-child(4){animation-delay:.28s}
    .site-header.nav-open .nav-link:nth-child(5){animation-delay:.36s}
    .nav-cta{display:none}
  }
  @keyframes fadeUp{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}

  /* ---------- Buttons ---------- */
  .btn{
    display:inline-flex;align-items:center;justify-content:center;gap:8px;
    height:44px;padding:0 24px;border-radius:var(--r-btn);
    font-size:15px;font-weight:600;line-height:1;white-space:nowrap;
    border:1px solid transparent;cursor:pointer;
    transition:transform .24s ease,background-color .24s ease,color .24s ease,border-color .24s ease,box-shadow .24s ease;
  }
  .btn-primary{background:var(--neon);color:#0A0C0B;border-color:var(--neon)}
  .btn-primary:hover{background:transparent;color:var(--neon);transform:translateY(-2px);box-shadow:0 0 24px rgba(198,242,78,.18)}
  .btn-outline{background:transparent;color:var(--neon);border-color:var(--line-strong)}
  .btn-outline:hover{background:rgba(198,242,78,.10);transform:translateY(-2px);box-shadow:0 0 24px rgba(198,242,78,.18)}
  .btn-ghost{background:transparent;color:var(--txt-2);border-color:var(--line)}
  .btn-ghost:hover{color:var(--txt);border-color:var(--line-strong);transform:translateY(-2px)}
  .btn:active{transform:translateY(1px)}
  .btn[disabled],.btn.is-disabled{opacity:.4;pointer-events:none;transform:none}
  .link-arrow{display:inline-flex;align-items:center;gap:6px;color:var(--neon);font-size:15px;font-weight:600}
  .link-arrow svg,.link-arrow .arw{transition:transform .24s ease}
  .link-arrow:hover .arw{transform:translateX(4px)}

  /* ---------- Badges ---------- */
  .badge{
    display:inline-flex;align-items:center;gap:6px;
    padding:6px 14px;border-radius:999px;font-size:13px;line-height:1.4;
    background:rgba(198,242,78,.10);border:1px solid rgba(198,242,78,.22);color:var(--neon);
  }
  .badge-violet{background:rgba(122,107,255,.12);border-color:rgba(122,107,255,.30);color:#B9B0FF}

  /* ---------- Hero ---------- */
  .hero{
    position:relative;overflow:hidden;
    padding:72px 0 64px;
    border-bottom:1px solid var(--line);
    background-image:
      linear-gradient(180deg,rgba(10,12,11,.74) 0%,rgba(10,12,11,.93) 62%,var(--ink-900) 100%),
      url('/assets/images/backpic/back-1.webp');
    background-size:cover;background-position:center right;
  }
  .hero-index{
    position:absolute;right:-8px;top:8px;
    font-family:var(--mono);font-weight:800;line-height:.8;
    font-size:clamp(150px,26vw,360px);
    color:rgba(198,242,78,.06);
    pointer-events:none;user-select:none;
  }
  .hero-inner{position:relative;z-index:2;max-width:800px}
  .hero h1{
    font-size:clamp(2rem,4.2vw,3.75rem);
    line-height:1.08;font-weight:800;letter-spacing:-0.02em;
    margin:20px 0 16px;
  }
  .hero-sub{font-size:clamp(1rem,1.4vw,1.1875rem);color:var(--txt-2);max-width:36em}
  .hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:28px}
  .hero-metrics{display:flex;flex-wrap:wrap;gap:28px 44px;margin-top:44px;padding-top:26px;border-top:1px solid var(--line)}
  .metric b{display:block;font-family:var(--mono);font-size:clamp(1.75rem,3vw,2.5rem);font-weight:700;color:var(--neon);line-height:1.1}
  .metric span{font-size:13px;color:var(--txt-3)}
  @media (max-width:639px){
    .hero{padding:52px 0 48px}
    .hero-metrics{gap:22px 32px}
  }

  /* ---------- Sections ---------- */
  .section{padding-top:clamp(56px,7vw,104px);padding-bottom:clamp(56px,7vw,104px)}
  .section-head{max-width:760px;margin-bottom:clamp(32px,4vw,52px)}
  .section-head h2{font-size:clamp(1.5rem,2.4vw,2.25rem);line-height:1.2;font-weight:700;margin-bottom:14px}
  .section-lead{color:var(--txt-2);font-size:1rem}
  .kicker{font-family:var(--mono);font-size:13px;letter-spacing:.16em;color:var(--neon);opacity:.75;text-transform:uppercase;margin-bottom:12px;display:block}

  /* ---------- Index list ---------- */
  .idx-list{border-top:1px solid var(--line)}
  .idx-row{
    position:relative;display:grid;grid-template-columns:64px 1fr 28px;gap:18px;
    padding:26px 0;border-bottom:1px solid var(--line);
    transition:transform .24s ease;
  }
  .idx-row::after{
    content:'';position:absolute;left:0;bottom:-1px;height:1px;width:100%;
    background:linear-gradient(90deg,var(--neon),rgba(198,242,78,.05));
    transform:scaleX(0);transform-origin:left;
    transition:transform .42s cubic-bezier(.22,.61,.36,1);
  }
  .idx-row:hover{transform:translateX(4px)}
  .idx-row:hover::after{transform:scaleX(1)}
  .idx-num{font-family:var(--mono);font-size:1.125rem;font-weight:700;color:var(--neon);opacity:.6;padding-top:4px;transition:opacity .24s ease}
  .idx-row:hover .idx-num{opacity:1}
  .idx-title{font-size:clamp(1.0625rem,1.6vw,1.25rem);font-weight:600;color:var(--txt)}
  .idx-desc{font-size:15px;color:var(--txt-2);margin-top:6px;max-width:46em}
  .idx-arrow{color:var(--txt-3);display:flex;align-items:flex-start;justify-content:flex-end;padding-top:6px;transition:transform .24s ease,color .24s ease}
  .idx-row:hover .idx-arrow{transform:translateX(4px);color:var(--neon)}
  @media (max-width:639px){
    .idx-row{grid-template-columns:44px 1fr 22px;gap:12px;padding:20px 0}
    .idx-num{font-size:1rem}
  }

  /* ---------- Steps ---------- */
  .steps{display:grid;grid-template-columns:1fr;gap:24px}
  @media (min-width:640px){.steps{grid-template-columns:repeat(3,1fr);gap:24px}}
  @media (min-width:1024px){.steps{gap:32px}}
  .step{padding-top:20px;border-top:2px solid rgba(198,242,78,.30);transition:border-color .24s ease,transform .24s ease}
  .step:hover{border-color:var(--neon);transform:translateY(-3px)}
  .step-num{font-family:var(--mono);font-size:13px;color:var(--neon);letter-spacing:.12em}
  .step h3{font-size:1.0625rem;font-weight:600;margin:10px 0 8px}
  .step p{font-size:15px;color:var(--txt-2);margin:0}

  /* ---------- Split block ---------- */
  .split{display:grid;grid-template-columns:1fr;gap:32px;align-items:center}
  @media (min-width:1024px){.split{grid-template-columns:7fr 5fr;gap:48px}}
  .split-media{border-radius:var(--r-sm);overflow:hidden;border:1px solid var(--line);aspect-ratio:16/9;background:var(--ink-800)}
  .split-media img{width:100%;height:100%;object-fit:cover}
  .check-list{display:grid;gap:2px;margin-top:24px}
  .check-item{display:flex;gap:14px;padding:16px 0;border-top:1px solid var(--line)}
  .check-dot{flex:0 0 6px;width:6px;height:6px;border-radius:2px;background:var(--neon);margin-top:11px}
  .check-item strong{display:block;font-size:1rem;font-weight:600;margin-bottom:4px}
  .check-item span{font-size:15px;color:var(--txt-2)}

  /* ---------- Panels ---------- */
  .panel{background:var(--ink-800);border:1px solid var(--line);border-radius:var(--r-card);padding:26px}
  @media (min-width:1024px){.panel{padding:32px}}
  .grid-2{display:grid;grid-template-columns:1fr;gap:20px}
  @media (min-width:640px){.grid-2{grid-template-columns:repeat(2,1fr)}}
  .mini-card{
    background:var(--ink-800);border:1px solid var(--line);border-radius:var(--r-card);
    padding:24px;transition:transform .24s ease,border-color .24s ease,box-shadow .24s ease;
  }
  .mini-card:hover{transform:translateY(-3px);border-color:var(--line-strong);box-shadow:0 0 24px rgba(198,242,78,.18)}
  .mini-card h3{font-size:1.0625rem;font-weight:600;margin-bottom:8px}
  .mini-card p{font-size:15px;color:var(--txt-2);margin:0}

  /* ---------- Link rows ---------- */
  .link-rows{border-top:1px solid var(--line)}
  .link-row{
    display:flex;align-items:center;justify-content:space-between;gap:18px;
    padding:20px 0;border-bottom:1px solid var(--line);
    transition:transform .24s ease,color .24s ease;
  }
  .link-row:hover{transform:translateX(4px);color:var(--neon)}
  .link-row .lr-left strong{display:block;font-size:1rem;font-weight:600}
  .link-row .lr-left span{font-size:14px;color:var(--txt-3)}
  .link-row .arw{transition:transform .24s ease}
  .link-row:hover .arw{transform:translateX(4px)}

  /* ---------- FAQ ---------- */
  .faq-list{border-top:1px solid var(--line)}
  .faq-item{border-bottom:1px solid var(--line)}
  .faq-q{
    width:100%;display:flex;align-items:flex-start;justify-content:space-between;gap:18px;
    background:none;border:0;padding:22px 0;text-align:left;cursor:pointer;
    color:var(--txt);font-size:17px;font-weight:600;line-height:1.5;
    transition:color .24s ease;
  }
  .faq-q:hover{color:var(--neon)}
  .faq-icon{
    position:relative;flex:0 0 16px;width:16px;height:16px;margin-top:5px;
    transition:transform .24s ease;
  }
  .faq-icon::before,.faq-icon::after{
    content:'';position:absolute;background:var(--neon);border-radius:2px;
  }
  .faq-icon::before{left:0;top:7px;width:16px;height:2px}
  .faq-icon::after{left:7px;top:0;width:2px;height:16px}
  .faq-item.open .faq-icon{transform:rotate(45deg)}
  .faq-a{
    max-height:0;overflow:hidden;
    transition:max-height .24s ease,padding .24s ease,opacity .24s ease;
    opacity:0;
  }
  .faq-item.open .faq-a{max-height:320px;opacity:1;padding-bottom:22px}
  .faq-a p{font-size:15px;line-height:1.8;color:var(--txt-2);max-width:52em}

  /* ---------- CTA ---------- */
  .cta-band{
    position:relative;overflow:hidden;border-radius:var(--r-card);
    border:1px solid var(--line);
    background-image:
      linear-gradient(120deg,rgba(10,12,11,.94) 0%,rgba(10,12,11,.86) 60%,rgba(10,12,11,.94) 100%),
      url('/assets/images/backpic/back-3.webp');
    background-size:cover;background-position:center;
    padding:clamp(32px,5vw,56px);
  }
  .cta-band::before{
    content:'';position:absolute;inset:-40% -10%;pointer-events:none;
    background:linear-gradient(45deg,transparent 42%,rgba(198,242,78,.08) 50%,transparent 58%);
  }
  .cta-band > *{position:relative;z-index:2}
  .cta-band h2{font-size:clamp(1.5rem,2.4vw,2.25rem);line-height:1.2;font-weight:700;margin-bottom:14px}
  .cta-band p{color:var(--txt-2);max-width:44em}
  .cta-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:28px}

  /* ---------- Footer ---------- */
  .site-footer{border-top:1px solid var(--line);background:#0C0F0D;margin-top:clamp(48px,6vw,88px)}
  .footer-grid{display:grid;grid-template-columns:1fr;gap:36px;padding:64px 0 48px}
  @media (min-width:640px){.footer-grid{grid-template-columns:repeat(2,1fr)}}
  @media (min-width:1024px){.footer-grid{grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px}}
  .footer-col h4{font-size:15px;font-weight:600;margin-bottom:14px;color:var(--txt)}
  .footer-col ul{display:grid;gap:10px}
  .footer-col a{font-size:14px;color:var(--txt-2);transition:color .2s ease}
  .footer-col a:hover{color:var(--neon)}
  .footer-col p{font-size:14px;line-height:1.8;color:var(--txt-2);max-width:34em}
  .footer-bottom{
    display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;
    padding:20px 0;border-top:1px solid var(--line);
    font-size:13px;color:var(--txt-3);
  }

  /* ---------- Reveal ---------- */
  .reveal{opacity:0;transform:translateY(12px);transition:opacity .48s cubic-bezier(.22,.61,.36,1),transform .48s cubic-bezier(.22,.61,.36,1)}
  .reveal.in{opacity:1;transform:none}

  @media (prefers-reduced-motion:reduce){
    *,*::before,*::after{animation:none!important;transition:none!important}
    .reveal{opacity:1;transform:none}
    html{scroll-behavior:auto}
  }

/* roulang page: category4 */
:root{
  --ink-900:#0A0C0B;
  --ink-800:#121614;
  --ink-700:#1A1F1C;
  --line:rgba(198,242,78,0.14);
  --line-strong:rgba(198,242,78,0.45);
  --neon:#C6F24E;
  --neon-dim:#9CC63A;
  --violet:#7A6BFF;
  --text:#E8EDE6;
  --text-2:#9AA39C;
  --text-3:#5E6660;
  --ok:#4ADE80;
  --warn:#FF8A4C;
  --err:#FF6B6B;
  --radius-lg:18px;
  --radius-sm:12px;
  --radius-btn:14px;
  --wrap:1240px;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;scroll-padding-top:92px;}
body{
  margin:0;
  background:var(--ink-900);
  color:var(--text);
  font-family:'PingFang SC','HarmonyOS Sans SC','Noto Sans SC','Microsoft YaHei',-apple-system,sans-serif;
  font-size:1.0625rem;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
h1,h2,h3,h4,p,ul,ol,figure{margin:0;padding:0;}
ul,ol{list-style:none;}
main{display:block;}
:focus-visible{outline:2px solid var(--neon);outline-offset:3px;border-radius:6px;}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 20px;width:100%;}
@media(min-width:640px){.wrap{padding:0 32px;}}
@media(min-width:1024px){.wrap{padding:0 48px;}}

/* ============ 顶部导航 ============ */
.site-header{
  position:sticky;top:0;z-index:90;
  background:transparent;
  border-bottom:1px solid transparent;
  transition:background .3s var(--ease),border-color .3s var(--ease),backdrop-filter .3s var(--ease);
}
.site-header.scrolled{
  background:rgba(10,12,11,.86);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
.site-header.scrolled::after{
  content:"";position:absolute;left:0;bottom:-1px;height:1px;width:100%;
  background:linear-gradient(90deg,var(--neon),rgba(198,242,78,0));
  pointer-events:none;
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;height:68px;}
.logo{display:inline-flex;align-items:center;gap:10px;font-weight:800;font-size:1.125rem;letter-spacing:-.01em;line-height:1;}
.logo-mark{
  width:30px;height:30px;border-radius:10px;flex:none;
  background:var(--neon);color:var(--ink-900);
  display:grid;place-items:center;font-size:.85rem;font-weight:800;
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
}
.logo em{font-style:normal;color:var(--neon);}
.nav-links{display:none;}
@media(min-width:1024px){.nav-links{display:flex;align-items:center;gap:26px;}}
.nav-link{position:relative;font-size:15px;color:var(--text-2);padding:8px 0;transition:color .24s var(--ease);white-space:nowrap;}
.nav-link::after{
  content:"";position:absolute;left:0;bottom:2px;height:2px;width:0;
  background:var(--neon);border-radius:2px;transition:width .24s var(--ease);
}
.nav-link:hover{color:var(--text);}
.nav-link:hover::after{width:16px;}
.nav-link.active{color:var(--neon);}
.nav-link.active::after{width:100%;box-shadow:0 0 12px rgba(198,242,78,.6);}
.nav-actions{display:flex;align-items:center;gap:12px;}
.nav-cta{display:none;}
@media(min-width:1024px){.nav-cta{display:inline-flex;}}
.burger{
  width:44px;height:44px;border:1px solid var(--line);border-radius:12px;
  display:grid;place-content:center;gap:5px;transition:border-color .24s var(--ease);
}
.burger:hover{border-color:var(--line-strong);}
.burger span{display:block;width:18px;height:2px;background:var(--text);border-radius:2px;transition:transform .24s var(--ease),opacity .24s var(--ease);}
.burger.active span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.burger.active span:nth-child(2){opacity:0;}
.burger.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}
@media(min-width:1024px){.burger{display:none;}}

.drawer{
  position:fixed;inset:0;z-index:120;
  background:rgba(10,12,11,.97);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  transform:translateX(100%);
  transition:transform .36s var(--ease);
  padding:22px 24px 40px;
  display:flex;flex-direction:column;overflow-y:auto;
}
.drawer.open{transform:translateX(0);}
.drawer-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px;}
.drawer-link{
  display:block;font-size:18px;color:var(--text);
  padding:18px 2px;border-bottom:1px solid var(--line);
  opacity:0;transform:translateY(10px);
  transition:opacity .32s var(--ease),transform .32s var(--ease),color .24s var(--ease);
}
.drawer.open .drawer-link{opacity:1;transform:none;}
.drawer-link.active{color:var(--neon);}
.drawer-cta{margin-top:26px;width:100%;}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 24px;border-radius:var(--radius-btn);
  font-size:15px;font-weight:600;line-height:1;
  transition:transform .24s var(--ease),background .24s var(--ease),color .24s var(--ease),border-color .24s var(--ease),box-shadow .24s var(--ease);
}
.btn-primary{background:var(--neon);color:var(--ink-900);border:1px solid var(--neon);}
.btn-primary:hover{background:transparent;color:var(--neon);transform:translateY(-2px);box-shadow:0 0 24px rgba(198,242,78,.18);}
.btn-primary:active{transform:translateY(1px);}
.btn-outline{background:transparent;color:var(--neon);border:1px solid var(--line-strong);}
.btn-outline:hover{background:var(--neon);color:var(--ink-900);transform:translateY(-2px);}
.btn-outline:active{transform:translateY(1px);}
.btn-ghost{background:transparent;color:var(--text);border:1px solid var(--line);}
.btn-ghost:hover{border-color:var(--line-strong);color:var(--neon);transform:translateY(-2px);}
.btn-ghost:active{transform:translateY(1px);}
.btn[disabled]{opacity:.4;pointer-events:none;}
.btn-link{display:inline-flex;align-items:center;gap:6px;color:var(--neon);font-weight:600;font-size:15px;}
.btn-link .arrow{transition:transform .24s var(--ease);}
.btn-link:hover .arrow{transform:translateX(4px);}

/* ============ 徽章 ============ */
.badge{
  display:inline-flex;align-items:center;gap:6px;
  border-radius:999px;padding:5px 14px;
  font-size:12.5px;letter-spacing:.04em;font-weight:600;
  background:rgba(198,242,78,.10);
  color:var(--neon);
  border:1px solid rgba(198,242,78,.22);
}
.badge-violet{background:rgba(122,107,255,.12);color:#A79CFF;border-color:rgba(122,107,255,.32);}

/* ============ 首屏 ============ */
.page-hero{position:relative;overflow:hidden;padding:64px 0 44px;}
.page-hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(198,242,78,.055) 1px,transparent 1px),linear-gradient(90deg,rgba(198,242,78,.055) 1px,transparent 1px);
  background-size:24px 24px;
  -webkit-mask-image:radial-gradient(circle at 24% 26%,#000,transparent 72%);
  mask-image:radial-gradient(circle at 24% 26%,#000,transparent 72%);
}
.page-hero::after{
  content:"";position:absolute;top:-180px;left:-120px;width:520px;height:520px;
  background:radial-gradient(circle,rgba(198,242,78,.13),transparent 66%);
  pointer-events:none;
}
.page-hero .wrap{position:relative;z-index:1;}
.page-hero h1{
  font-size:clamp(2rem,4.2vw,3.25rem);
  line-height:1.08;font-weight:800;letter-spacing:-.02em;
  margin:18px 0 14px;max-width:900px;
}
.hero-line{color:var(--text-2);font-size:1.0625rem;max-width:680px;}
.anchor-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:30px;}
.anchor-chip{
  display:inline-flex;align-items:center;gap:8px;
  border:1px solid var(--line);border-radius:999px;
  padding:9px 18px;font-size:14px;color:var(--text-2);
  transition:color .24s var(--ease),border-color .24s var(--ease),background .24s var(--ease),transform .24s var(--ease);
}
.anchor-chip::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--text-3);transition:background .24s var(--ease);}
.anchor-chip:hover{color:var(--neon);border-color:var(--line-strong);background:rgba(198,242,78,.08);transform:translateY(-2px);}
.anchor-chip:hover::before{background:var(--neon);}

/* ============ 通用板块 ============ */
.section{padding:56px 0;}
@media(min-width:1024px){.section{padding:96px 0;}}
.section-tight{padding:40px 0;}
@media(min-width:1024px){.section-tight{padding:56px 0;}}
.sec-head{max-width:780px;margin-bottom:34px;}
.sec-head h2{
  font-size:clamp(1.5rem,2.4vw,2.25rem);
  line-height:1.2;font-weight:700;letter-spacing:-.01em;
  margin:16px 0 12px;
}
.sec-sub{color:var(--text-2);font-size:1rem;line-height:1.8;}

/* ============ 数据条 ============ */
.stats{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;}
@media(min-width:1024px){.stats{grid-template-columns:repeat(4,minmax(0,1fr));gap:20px;}}
.stat{
  background:var(--ink-800);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:22px 20px;
  transition:transform .24s var(--ease),border-color .24s var(--ease),box-shadow .24s var(--ease);
}
.stat:hover{transform:translateY(-3px);border-color:var(--line-strong);box-shadow:0 0 24px rgba(198,242,78,.18);}
.stat b{
  display:block;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:clamp(1.75rem,3vw,2.5rem);font-weight:700;line-height:1;color:var(--neon);
  letter-spacing:-.02em;
}
.stat span{display:block;margin-top:10px;font-size:13.5px;color:var(--text-2);}

/* ============ 条带对照 ============ */
.bands{border-top:1px solid var(--line);}
.band{
  position:relative;
  display:grid;grid-template-columns:1fr;gap:8px;
  padding:20px 0;border-bottom:1px solid var(--line);
  transition:background .24s var(--ease);
}
.band::before{
  content:"";position:absolute;left:-12px;top:50%;transform:translateY(-50%);
  width:3px;height:0;background:var(--neon);border-radius:2px;
  transition:height .24s var(--ease);
}
.band:hover{background:linear-gradient(90deg,rgba(198,242,78,.06),transparent 62%);}
.band:hover::before{height:58%;}
.band > *{transition:transform .24s var(--ease);}
.band:hover > *{transform:translateX(4px);}
@media(min-width:768px){
  .band{grid-template-columns:200px 1fr;gap:32px;align-items:baseline;padding:24px 0;}
}
.band-term{font-size:1.0625rem;font-weight:600;color:var(--text);}
.band:hover .band-term{color:var(--neon);}
.band-desc{color:var(--text-2);font-size:15px;line-height:1.78;max-width:760px;}
.marker{display:flex;align-items:center;gap:14px;padding:16px 0;border-bottom:1px solid var(--line);}
.marker-line{flex:1;height:1px;background:linear-gradient(90deg,transparent,rgba(198,242,78,.28));}
.marker-line.rev{background:linear-gradient(90deg,rgba(198,242,78,.28),transparent);}
.marker-badge{
  font-size:12px;letter-spacing:.1em;color:var(--neon);white-space:nowrap;
  background:rgba(198,242,78,.10);border:1px solid rgba(198,242,78,.26);
  border-radius:999px;padding:5px 15px;font-weight:600;
}

/* ============ 图文节奏块 ============ */
.rhythm{display:grid;gap:28px;}
@media(min-width:1024px){.rhythm{grid-template-columns:7fr 5fr;gap:48px;align-items:center;}}
.rhythm-media{
  border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden;
  aspect-ratio:16/9;background:var(--ink-800);
}
.rhythm-media img{width:100%;height:100%;object-fit:cover;}
.rhythm-list{display:flex;flex-direction:column;}
.rhythm-item{
  display:grid;grid-template-columns:46px 1fr;gap:16px;
  padding:20px 0;border-bottom:1px solid var(--line);
}
.rhythm-item:first-child{padding-top:0;}
.rhythm-item:last-child{border-bottom:0;padding-bottom:0;}
.rhythm-num{
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:15px;font-weight:700;color:var(--neon);opacity:.6;line-height:1.8;
}
.rhythm-item h3{font-size:1.0625rem;font-weight:600;margin-bottom:6px;}
.rhythm-item p{font-size:15px;color:var(--text-2);line-height:1.78;}
.rhythm-foot{margin-top:22px;}

/* ============ FAQ ============ */
.faq{border-top:1px solid var(--line);}
.faq-item{border-bottom:1px solid var(--line);}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:20px 2px;font-size:17px;font-weight:600;text-align:left;color:var(--text);
  transition:color .24s var(--ease);
}
.faq-q:hover{color:var(--neon);}
.faq-icon{
  position:relative;width:22px;height:22px;flex:none;
  transition:transform .24s var(--ease);
}
.faq-icon::before,.faq-icon::after{
  content:"";position:absolute;left:50%;top:50%;background:var(--neon);border-radius:2px;
}
.faq-icon::before{width:14px;height:2px;transform:translate(-50%,-50%);}
.faq-icon::after{width:2px;height:14px;transform:translate(-50%,-50%);}
.faq-item.open .faq-icon{transform:rotate(45deg);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .24s var(--ease);}
.faq-item.open .faq-a{max-height:340px;}
.faq-a p{padding:0 2px 24px;font-size:15px;line-height:1.82;color:var(--text-2);max-width:820px;}

/* ============ CTA ============ */
.cta-panel{
  position:relative;overflow:hidden;
  border:1px solid var(--line);border-radius:var(--radius-lg);
  background:var(--ink-800);
  padding:48px 26px;
}
.cta-panel::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(45deg,rgba(198,242,78,.08) 0 2px,transparent 2px 16px);
  opacity:.7;
}
.cta-panel::after{
  content:"";position:absolute;right:-40px;bottom:-60px;width:420px;height:420px;
  background:radial-gradient(circle,rgba(198,242,78,.18),transparent 66%);
  pointer-events:none;
}
.cta-inner{position:relative;z-index:1;max-width:680px;}
.cta-inner h2{font-size:clamp(1.5rem,2.4vw,2.25rem);line-height:1.2;font-weight:700;margin-bottom:14px;}
.cta-inner p{color:var(--text-2);font-size:1rem;line-height:1.8;}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:28px;}
@media(min-width:768px){.cta-panel{padding:64px 56px;}}

/* ============ 页脚 ============ */
.site-footer{border-top:1px solid var(--line);padding:60px 0 28px;margin-top:20px;}
.footer-grid{display:grid;grid-template-columns:1fr;gap:34px;}
@media(min-width:640px){.footer-grid{grid-template-columns:1fr 1fr;}}
@media(min-width:1024px){.footer-grid{grid-template-columns:1.5fr 1fr 1fr 1fr;gap:44px;}}
.footer-col h4{font-size:13px;letter-spacing:.1em;color:var(--text-3);font-weight:600;margin-bottom:16px;}
.footer-col ul{display:flex;flex-direction:column;gap:11px;}
.footer-col a{color:var(--text-2);font-size:15px;transition:color .24s var(--ease);}
.footer-col a:hover{color:var(--neon);}
.footer-col p{color:var(--text-2);font-size:14px;line-height:1.8;max-width:340px;}
.footer-bottom{
  display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;
  border-top:1px solid var(--line);margin-top:42px;padding-top:22px;
  font-size:13px;color:var(--text-3);
}

/* ============ 入场动效 ============ */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .48s var(--ease),transform .48s var(--ease);}
.reveal.in{opacity:1;transform:none;}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{animation:none!important;transition:none!important;}
  .reveal{opacity:1;transform:none;}
}

/* roulang page: category3 */
:root{
  --ink-900:#0A0C0B;
  --ink-800:#121614;
  --ink-700:#1A1F1C;
  --line:rgba(198,242,78,.14);
  --line-strong:rgba(198,242,78,.45);
  --neon:#C6F24E;
  --neon-dim:#9CC63A;
  --violet:#7A6BFF;
  --violet-soft:#A79CFF;
  --txt:#E8EDE6;
  --txt-2:#9AA39C;
  --txt-3:#5E6660;
  --ok:#4ADE80;
  --warn:#FF8A4C;
  --err:#FF6B6B;
  --radius-card:18px;
  --radius-ctrl:12px;
  --radius-btn:14px;
  --shadow-hover:0 0 24px rgba(198,242,78,.18);
  --ease:cubic-bezier(.22,.61,.36,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--ink-900);
  color:var(--txt);
  font-family:'PingFang SC','HarmonyOS Sans SC','Noto Sans SC','Microsoft YaHei',-apple-system,sans-serif;
  font-size:1.0625rem;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body img{display:block;max-width:100%;height:auto}
body a{color:inherit;text-decoration:none}
body ul{list-style:none;padding:0;margin:0}
body h1,body h2,body h3,body h4{margin:0;letter-spacing:-.01em}
body button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
body p{margin:0}
.num{font-family:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,monospace}
.wrap{width:100%;max-width:1240px;margin:0 auto;padding:0 20px}
@media(min-width:640px){.wrap{padding:0 32px}}
@media(min-width:1024px){.wrap{padding:0 48px}}
@media(min-width:1280px){.wrap{padding:0 56px}}

/* ---------- 顶部导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  height:68px;display:flex;align-items:center;
  background:transparent;
  transition:background .32s var(--ease),backdrop-filter .32s var(--ease);
}
.site-header::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
  background:linear-gradient(90deg,var(--neon),rgba(198,242,78,0));
  opacity:0;transition:opacity .32s var(--ease);
}
.site-header.scrolled{background:rgba(10,12,11,.86);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px)}
.site-header.scrolled::after{opacity:1}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;width:100%}
.logo{display:inline-flex;align-items:center;gap:10px;font-weight:800;font-size:1.0625rem;letter-spacing:-.01em;white-space:nowrap}
.logo-mark{
  width:30px;height:30px;border-radius:9px;flex:0 0 30px;
  background:var(--neon);color:var(--ink-900);
  display:grid;place-items:center;
  font-family:'JetBrains Mono',ui-monospace,monospace;font-weight:700;font-size:.95rem;
}
.logo em{font-style:normal;color:var(--neon)}
.nav-links{display:flex;align-items:center;gap:26px}
.nav-link{position:relative;font-size:15px;color:var(--txt-2);padding:8px 0;transition:color .24s var(--ease)}
.nav-link::after{
  content:"";position:absolute;left:50%;bottom:2px;height:2px;width:0;border-radius:2px;
  background:var(--neon);transform:translateX(-50%);transition:width .24s var(--ease);
}
.nav-link:hover{color:var(--txt)}
.nav-link:hover::after{width:16px}
.nav-link.active{color:var(--neon)}
.nav-link.active::after{width:100%;box-shadow:0 0 12px rgba(198,242,78,.65)}
.nav-actions{display:flex;align-items:center;gap:12px}
.burger{
  display:none;width:42px;height:42px;border-radius:var(--radius-ctrl);
  border:1px solid var(--line);align-items:center;justify-content:center;flex-direction:column;gap:5px;
}
.burger span{display:block;width:18px;height:2px;background:var(--txt);border-radius:2px;transition:.24s var(--ease)}
.burger[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
@media(max-width:1023px){
  .nav-links{display:none}
  .nav-cta{display:none}
  .burger{display:flex}
}
/* 抽屉 */
.drawer{
  position:fixed;inset:0;z-index:70;background:rgba(10,12,11,.98);
  padding:24px 20px 40px;display:flex;flex-direction:column;gap:8px;
  opacity:0;visibility:hidden;transform:translateY(-10px);
  transition:opacity .3s var(--ease),transform .3s var(--ease),visibility .3s;
}
.drawer.open{opacity:1;visibility:visible;transform:none}
.drawer-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}
.drawer-close{width:42px;height:42px;border-radius:var(--radius-ctrl);border:1px solid var(--line);display:grid;place-items:center;font-size:20px;color:var(--txt-2)}
.drawer a.drawer-link{
  font-size:18px;font-weight:600;color:var(--txt);padding:16px 4px;
  border-bottom:1px solid var(--line);
  opacity:0;transform:translateY(8px);
  transition:opacity .34s var(--ease),transform .34s var(--ease),color .2s;
}
.drawer.open a.drawer-link{opacity:1;transform:none}
.drawer a.drawer-link:nth-child(2){transition-delay:.04s}
.drawer a.drawer-link:nth-child(3){transition-delay:.09s}
.drawer a.drawer-link:nth-child(4){transition-delay:.14s}
.drawer a.drawer-link:nth-child(5){transition-delay:.19s}
.drawer a.drawer-link:nth-child(6){transition-delay:.24s}
.drawer a.drawer-link:hover,.drawer a.drawer-link.active{color:var(--neon)}
.drawer-cta{margin-top:28px;justify-content:center;width:100%}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 24px;border-radius:var(--radius-btn);
  font-size:15px;font-weight:600;border:1px solid transparent;white-space:nowrap;
  transition:background .24s var(--ease),color .24s var(--ease),border-color .24s var(--ease),transform .24s var(--ease),box-shadow .24s var(--ease);
}
.btn-primary{background:var(--neon);color:var(--ink-900)}
.btn-primary:hover{background:transparent;color:var(--neon);border-color:var(--line-strong);transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.btn-outline{background:transparent;color:var(--neon);border-color:rgba(198,242,78,.45)}
.btn-outline:hover{background:rgba(198,242,78,.10);transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.btn-text{background:none;border:0;height:auto;padding:0;color:var(--neon);font-weight:600;font-size:15px}
.btn-text .arw{transition:transform .24s var(--ease)}
.btn-text:hover .arw{transform:translateX(4px)}
.btn:active{transform:translateY(1px)}
.btn-sm{height:38px;padding:0 18px;font-size:14px;border-radius:var(--radius-ctrl)}
.btn:focus-visible,.nav-link:focus-visible,.drawer a:focus-visible,.faq-q:focus-visible,input:focus-visible{outline:2px solid var(--neon);outline-offset:3px}

/* ---------- 徽章 / 标签 ---------- */
.badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 12px;border-radius:999px;
  background:rgba(198,242,78,.10);border:1px solid rgba(198,242,78,.20);
  color:var(--neon);font-size:.8125rem;font-weight:600;line-height:1.6;
}
.badge-violet{background:rgba(122,107,255,.12);border-color:rgba(122,107,255,.28);color:var(--violet-soft)}
.tag-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
.tag{
  padding:6px 14px;border-radius:999px;border:1px solid var(--line);
  color:var(--txt-2);font-size:.8125rem;transition:.2s var(--ease);
}
.tag:hover{color:var(--neon);border-color:var(--line-strong)}

/* ---------- Hero ---------- */
.page-hero{position:relative;isolation:isolate;overflow:hidden;padding:56px 0 52px;border-bottom:1px solid var(--line)}
.page-hero::before{
  content:"";position:absolute;inset:0;z-index:-2;
  background-image:linear-gradient(rgba(232,237,230,.5) 1px,transparent 1px),linear-gradient(90deg,rgba(232,237,230,.5) 1px,transparent 1px);
  background-size:24px 24px;opacity:.05;
}
.page-hero::after{
  content:"";position:absolute;inset:0;z-index:-1;
  background-image:url('/assets/images/backpic/back-1.webp');
  background-size:cover;background-position:center;
  opacity:.16;
  -webkit-mask-image:linear-gradient(90deg,#000 0%,rgba(0,0,0,.35) 70%,transparent 100%);
  mask-image:linear-gradient(90deg,#000 0%,rgba(0,0,0,.35) 70%,transparent 100%);
}
.page-hero .wrap{position:relative;z-index:1}
.crumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:.8125rem;color:var(--txt-3);margin-bottom:22px}
.crumb a{color:var(--txt-2);transition:color .2s}
.crumb a:hover{color:var(--neon)}
.crumb .sep{color:var(--txt-3)}
.crumb .now{color:var(--txt-3)}
.hero-title{
  font-size:clamp(2rem,4.2vw,3.75rem);line-height:1.08;font-weight:800;letter-spacing:-.02em;
  max-width:20ch;margin:18px 0 0;
}
.hero-title em{font-style:normal;color:var(--neon)}
.hero-sub{color:var(--txt);font-size:1.0625rem;margin-top:18px;max-width:640px}
.hero-desc{color:var(--txt-2);font-size:1rem;margin-top:12px;max-width:720px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
.hero-metrics{display:flex;flex-wrap:wrap;gap:14px;margin-top:38px}
.metric{
  flex:1 1 160px;min-width:150px;
  background:var(--ink-800);border:1px solid var(--line);border-radius:var(--radius-card);
  padding:16px 20px;
}
.metric b{display:block;font-size:1.75rem;line-height:1.2;color:var(--neon);font-weight:700}
.metric span{display:block;color:var(--txt-2);font-size:.8125rem;margin-top:4px}

/* ---------- 区块 ---------- */
.section{padding:56px 0}
@media(min-width:1024px){.section{padding:96px 0}}
.section-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:34px}
.eyebrow{font-size:.8125rem;font-weight:700;letter-spacing:.18em;color:var(--neon);text-transform:uppercase}
.section-title{font-size:clamp(1.5rem,2.4vw,2.25rem);line-height:1.2;font-weight:700;margin-top:10px}
.section-sub{color:var(--txt-2);font-size:.9375rem;margin-top:10px;max-width:720px}

/* ---------- 搜索与编号速览 ---------- */
.search-bar{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:8px}
.field{position:relative;flex:1 1 280px;min-width:220px}
.field input{
  width:100%;height:50px;padding:0 16px;
  background:#0F1412;border:1px solid var(--line);border-radius:var(--radius-ctrl);
  color:var(--txt);font-size:.9375rem;
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.field input::placeholder{color:var(--txt-3)}
.field input:focus{outline:none;border-color:var(--neon);box-shadow:0 0 0 4px rgba(198,242,78,.14)}
.filter-hint{color:var(--txt-3);font-size:.8125rem;margin-top:10px}
.idx-list{border-top:1px solid var(--line);margin-top:26px}
.idx-item{
  display:grid;grid-template-columns:64px 1fr auto;align-items:center;gap:16px;
  padding:20px 14px;border-bottom:1px solid var(--line);
  transition:background .24s var(--ease),transform .24s var(--ease),box-shadow .24s var(--ease);
}
.idx-item:hover{background:rgba(198,242,78,.05);box-shadow:inset 3px 0 0 var(--neon);transform:translateX(4px)}
.idx-num{font-size:1rem;font-weight:700;color:var(--neon);opacity:.6}
.idx-main strong{display:block;font-size:1.0625rem;font-weight:600}
.idx-main span{display:block;color:var(--txt-2);font-size:.9375rem;margin-top:4px}
.idx-arrow{color:var(--txt-3);font-size:1.1rem;transition:transform .24s var(--ease),color .24s var(--ease)}
.idx-item:hover .idx-arrow{color:var(--neon);transform:translateX(4px)}
.empty-state{display:none;text-align:center;padding:38px 16px;color:var(--txt-2);border-bottom:1px solid var(--line)}
.empty-state.show{display:block}
.empty-state .dot{width:38px;height:38px;border-radius:50%;border:1px dashed var(--line-strong);margin:0 auto 12px}

/* ---------- 图文交错流 ---------- */
.zig-list{border-top:1px solid var(--line)}
.zig-block{
  display:grid;grid-template-columns:1fr;gap:26px;
  padding:44px 0;border-bottom:1px solid var(--line);
}
@media(min-width:1024px){
  .zig-block{grid-template-columns:1.05fr 1fr;gap:56px;align-items:center;padding:72px 0}
  .zig-block.flip .zig-media{order:2}
}
.zig-media{
  position:relative;border-radius:var(--radius-card);overflow:hidden;
  border:1px solid var(--line);background:var(--ink-800);aspect-ratio:16/10;
  transition:border-color .24s var(--ease),transform .24s var(--ease),box-shadow .24s var(--ease);
}
.zig-media img{width:100%;height:100%;object-fit:cover}
.zig-block:hover .zig-media{border-color:var(--line-strong);transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.zig-media .corner{
  position:absolute;left:14px;bottom:14px;
  background:rgba(10,12,11,.82);border:1px solid var(--line);border-radius:999px;
  padding:5px 12px;font-size:.75rem;color:var(--txt-2);
}
.zig-body .badge{margin-bottom:14px}
.zig-title{font-size:1.375rem;line-height:1.35;font-weight:600;margin-bottom:14px}
.zig-p{color:var(--txt-2);font-size:1rem;line-height:1.78;margin-bottom:12px}
.zig-body .btn-text{margin-top:8px}

/* ---------- FAQ ---------- */
.faq{border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:18px;
  padding:22px 4px;text-align:left;font-size:1.0625rem;font-weight:600;color:var(--txt);
  transition:color .2s var(--ease);
}
.faq-q:hover{color:var(--neon)}
.faq-icon{position:relative;width:16px;height:16px;flex:0 0 16px;transition:transform .24s var(--ease)}
.faq-icon::before,.faq-icon::after{
  content:"";position:absolute;background:var(--neon);border-radius:2px;
}
.faq-icon::before{left:0;top:7px;width:16px;height:2px}
.faq-icon::after{left:7px;top:0;width:2px;height:16px}
.faq-item.open .faq-icon{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .24s var(--ease)}
.faq-a p{color:var(--txt-2);font-size:.9375rem;line-height:1.8;padding:0 4px 24px;max-width:820px}

/* ---------- CTA ---------- */
.cta-band{
  position:relative;overflow:hidden;isolation:isolate;
  border:1px solid var(--line);border-radius:20px;background:var(--ink-800);
  padding:52px 24px;text-align:center;
}
.cta-band::before{
  content:"";position:absolute;inset:-40%;z-index:-1;
  background:linear-gradient(45deg,transparent 42%,rgba(198,242,78,.08) 50%,transparent 58%);
}
.cta-band h2{font-size:clamp(1.5rem,2.4vw,2.25rem);line-height:1.2;font-weight:700}
.cta-band p{color:var(--txt-2);font-size:1rem;margin:14px auto 0;max-width:620px}
.cta-band .hero-actions{justify-content:center;margin-top:28px}

/* ---------- 页脚 ---------- */
.site-footer{border-top:1px solid var(--line);background:var(--ink-900);padding:56px 0 24px;margin-top:24px}
.footer-grid{display:grid;grid-template-columns:1fr;gap:32px}
@media(min-width:640px){.footer-grid{grid-template-columns:1fr 1fr}}
@media(min-width:1024px){.footer-grid{grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px}}
.footer-col h4{font-size:.9375rem;font-weight:700;margin-bottom:16px;color:var(--txt)}
.footer-col p{color:var(--txt-2);font-size:.9375rem;line-height:1.8;max-width:340px}
.footer-col li{margin-bottom:10px}
.footer-col li a{color:var(--txt-2);font-size:.9375rem;transition:color .2s var(--ease)}
.footer-col li a:hover{color:var(--neon)}
.footer-bottom{
  display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;align-items:center;
  margin-top:44px;padding-top:22px;border-top:1px solid var(--line);
  color:var(--txt-3);font-size:.8125rem;
}

/* ---------- 底部转化条 ---------- */
.convert-bar{
  position:fixed;right:24px;bottom:24px;z-index:65;
  display:flex;align-items:center;gap:14px;
  padding:10px 12px 10px 22px;border-radius:999px;
  background:rgba(18,22,20,.96);border:1px solid var(--line);
  box-shadow:0 18px 44px rgba(0,0,0,.5);
  opacity:0;transform:translateY(20px);pointer-events:none;
  transition:opacity .3s var(--ease),transform .3s var(--ease);
}
.convert-bar.show{opacity:1;transform:none;pointer-events:auto}
.convert-bar span{font-size:.9375rem;color:var(--txt)}
.convert-close{width:32px;height:32px;border-radius:50%;border:1px solid var(--line);display:grid;place-items:center;color:var(--txt-2);font-size:14px;transition:.2s var(--ease)}
.convert-close:hover{color:var(--neon);border-color:var(--line-strong)}
.convert-bar.hidden{display:none}
@media(max-width:767px){
  .convert-bar{
    left:0;right:0;bottom:0;border-radius:0;padding:10px 16px;height:64px;justify-content:space-between;
    gap:10px;
  }
  .convert-bar span{font-size:.875rem}
  body{padding-bottom:64px}
}

/* ---------- 入场动效 ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .48s var(--ease),transform .48s var(--ease);transition-delay:var(--d,0ms)}
.reveal.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){
  *{animation:none !important;transition-duration:.01ms !important}
  .reveal{opacity:1;transform:none}
}