/* roulang page: index */
:root{
  --ink:#111114;--ink-2:#1B1B21;--paper:#FAF9F6;--paper-2:#F1EEE7;--line:#E2DED5;
  --muted:#6C6C74;--accent:#C8FF3D;--accent-ink:#0B0B0D;--accent-2:#6B4EFF;--danger:#E5484D;
  --shadow-1:0 1px 2px rgba(17,17,20,.04),0 8px 24px rgba(17,17,20,.06);
  --shadow-2:0 12px 40px rgba(17,17,20,.12);
  --ease:cubic-bezier(.2,.7,.2,1);
  --r-btn:999px;--r-card:18px;--r-img:16px;--r-input:12px;--r-block:28px;
  --font:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:ui-monospace,"SFMono-Regular","JetBrains Mono",Consolas,monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--paper);color:var(--ink);font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button,input,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
ul,ol{list-style:none}
h1,h2,h3{line-height:1.15;letter-spacing:-.01em}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
@media(min-width:1024px){.container{padding:0 32px}}
@media(min-width:1440px){.container{max-width:1280px}}
.mono{font-family:var(--mono);font-size:12.5px;letter-spacing:.04em}
.section{padding:56px 0}
@media(min-width:640px){.section{padding:72px 0}}
@media(min-width:1024px){.section{padding:96px 0}}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;flex-wrap:wrap;margin-bottom:32px}
.sec-head h2{font-size:clamp(1.6rem,3.4vw,2.5rem);font-weight:750}
.sec-head p{color:var(--muted);font-size:14.5px;margin-top:8px}
.sec-link{display:inline-flex;align-items:center;gap:6px;font-size:14.5px;font-weight:600;border-bottom:2px solid transparent;transition:border-color .2s var(--ease)}
.sec-link:hover{border-color:var(--accent)}
.sec-link svg{transition:transform .2s var(--ease)}
.sec-link:hover svg{transform:translateX(4px)}

/* ---------- 顶部信息条 ---------- */
.topbar{background:var(--ink);color:rgba(255,255,255,.72);font-size:12.5px;height:36px}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;height:36px;white-space:nowrap;overflow-x:auto;scrollbar-width:none}
.topbar-inner::-webkit-scrollbar{display:none}
.topbar-left{display:flex;align-items:center;gap:12px}
.topbar-domain{font-family:var(--mono);letter-spacing:.06em;color:rgba(255,255,255,.9)}
.topbar-sep{width:1px;height:12px;background:rgba(255,255,255,.25)}
.topbar-tip{display:none}
@media(min-width:640px){.topbar-tip{display:inline}}
.topbar-right{display:flex;align-items:center;gap:20px}
.topbar-right a{transition:color .2s var(--ease)}
.topbar-right a:hover{color:#fff;text-decoration:underline;text-decoration-color:var(--accent);text-decoration-thickness:2px;text-underline-offset:4px}

/* ---------- 主导航 ---------- */
.site-header{position:sticky;top:0;z-index:80}
.mainnav{background:var(--paper);border-bottom:1px solid var(--line);transition:box-shadow .32s var(--ease)}
.mainnav.scrolled{box-shadow:var(--shadow-1)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;height:68px;transition:height .32s var(--ease)}
.mainnav.scrolled .nav-inner{height:56px}
.logo{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.logo-mark{width:18px;height:18px;background:var(--accent);border-radius:3px 10px 3px 10px;display:inline-block;flex:0 0 auto}
.logo-text{display:flex;flex-direction:column;line-height:1.05}
.logo-text b{font-size:17px;font-weight:800;letter-spacing:-.02em}
.logo-text em{font-style:normal;font-size:12px;color:var(--muted);letter-spacing:.02em}
.nav-menu{display:none;align-items:center;gap:28px}
@media(min-width:1024px){.nav-menu{display:flex}}
.nav-menu a{position:relative;font-size:15px;color:var(--ink);padding:6px 0;transition:color .2s var(--ease)}
.nav-menu a::after{content:"";position:absolute;left:0;bottom:0;width:100%;height:2px;background:var(--accent);transform:scaleX(0);transform-origin:left;transition:transform .2s var(--ease)}
.nav-menu a:hover::after{transform:scaleX(1)}
.nav-menu a.active{font-weight:750}
.nav-menu a.active::before{content:"";position:absolute;left:-12px;top:50%;width:4px;height:4px;background:var(--accent);transform:translateY(-50%)}
.nav-actions{display:flex;align-items:center;gap:12px}
.icon-btn{width:38px;height:38px;border-radius:50%;border:1px solid var(--line);display:none;align-items:center;justify-content:center;transition:border-color .2s var(--ease),background .2s var(--ease)}
@media(min-width:1024px){.icon-btn{display:inline-flex}}
.icon-btn:hover{border-color:var(--accent);background:var(--paper-2)}
.nav-cta{display:none}
@media(min-width:640px){.nav-cta{display:inline-flex}}
.hamburger{display:inline-flex;width:40px;height:40px;align-items:center;justify-content:center;border-radius:10px;border:1px solid var(--line)}
@media(min-width:1024px){.hamburger{display:none}}
.hamburger span{display:block;width:16px;height:1.6px;background:var(--ink);position:relative}
.hamburger span::before,.hamburger span::after{content:"";position:absolute;left:0;width:16px;height:1.6px;background:var(--ink)}
.hamburger span::before{top:-5px}
.hamburger span::after{top:5px}
.mobile-panel{position:fixed;top:0;right:0;height:100vh;width:88vw;max-width:420px;background:var(--paper);border-left:1px solid var(--line);padding:28px 24px;transform:translateX(105%);transition:transform .32s var(--ease);z-index:90;display:flex;flex-direction:column;gap:8px;overflow-y:auto}
.mobile-panel.open{transform:translateX(0)}
.mobile-panel a{display:block;font-size:20px;line-height:56px;border-bottom:1px solid var(--line)}
.mobile-panel .btn{width:100%;justify-content:center;margin-top:16px;line-height:1.4}

/* ---------- 按钮 / 徽章 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:var(--r-btn);padding:13px 26px;font-size:15px;font-weight:650;border:1px solid transparent;transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease)}
.btn:active{transform:translateY(1px)}
.btn-sm{padding:9px 20px;font-size:14px}
.btn-primary{background:var(--accent);color:var(--accent-ink)}
.btn-primary:hover{background:var(--ink);color:var(--accent)}
.btn-ghost{border-color:var(--line);color:var(--ink)}
.btn-ghost:hover{border-color:var(--accent);background:var(--paper-2)}
.btn-light{background:#fff;color:var(--ink)}
.btn-light:hover{background:var(--accent);color:var(--accent-ink)}
.btn-outline-light{border-color:rgba(255,255,255,.4);color:#fff}
.btn-outline-light:hover{border-color:var(--accent);color:var(--accent);background:rgba(255,255,255,.04)}
.badge{display:inline-flex;align-items:center;font-size:11.5px;letter-spacing:.08em;border:1px solid;border-radius:6px;padding:4px 10px;line-height:1.5;font-weight:600}
.badge-a{color:var(--ink);border-color:var(--ink)}
.badge-b{color:var(--accent-2);border-color:var(--accent-2)}
.badge-c{color:var(--muted);border-color:var(--line)}
.tag-pill{display:inline-flex;align-items:center;border:1px solid var(--line);border-radius:999px;padding:6px 14px;font-size:13px;color:var(--muted);transition:border-color .2s var(--ease),color .2s var(--ease)}
.tag-pill:hover{border-color:var(--accent);color:var(--ink)}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;padding:56px 0 64px;background:var(--paper)}
@media(min-width:1024px){.hero{padding:80px 0 96px}}
.hero::before{content:"";position:absolute;inset:0;background-image:repeating-linear-gradient(45deg,rgba(17,17,20,.035) 0 1px,transparent 1px 14px);pointer-events:none}
.hero::after{content:"";position:absolute;right:-70px;bottom:-90px;width:240px;height:240px;border-radius:50%;background:var(--accent);filter:blur(90px);opacity:.10;pointer-events:none}
.hero-inner{position:relative;z-index:1;display:grid;gap:48px}
@media(min-width:1024px){.hero-inner{grid-template-columns:1fr 1fr;gap:56px;align-items:center}}
.hero-label{display:inline-flex;align-items:center;gap:8px;background:var(--accent);color:var(--accent-ink);border-radius:999px;padding:6px 14px;font-size:12.5px;font-weight:700;letter-spacing:.04em}
.hero h1{font-size:clamp(2.2rem,6.2vw,4.5rem);line-height:1.04;letter-spacing:-.02em;font-weight:800;margin:20px 0 18px}
.hero-sub{font-size:17px;color:var(--muted);max-width:34em}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:28px 0 32px}
.hero-stats{display:flex;flex-wrap:wrap;gap:0;border-top:1px solid var(--line);padding-top:20px}
.hero-stats li{padding-right:24px;margin-right:24px;border-right:1px solid var(--line);font-size:13px;color:var(--muted)}
.hero-stats li:last-child{border-right:0;margin-right:0;padding-right:0}
.hero-stats b{display:block;font-family:var(--mono);font-size:22px;color:var(--ink);letter-spacing:0}
.hero-cards{position:relative;height:520px}
@media(min-width:1024px){.hero-cards{height:600px}}
.phone-card{position:absolute;left:50%;border-radius:22px;overflow:hidden;background:var(--ink-2)}
.phone-card.back-2{width:280px;aspect-ratio:9/16;top:18px;transform:translateX(-50%) translateX(30px) rotate(2.5deg);opacity:.45;background-image:url(/assets/images/backpic/back-2.png);background-size:cover;background-position:center}
.phone-card.back-3{width:270px;aspect-ratio:9/16;top:34px;transform:translateX(-50%) translateX(-46px) rotate(-3deg);opacity:.3;background-image:url(/assets/images/backpic/back-3.png);background-size:cover;background-position:center}
.phone-card.main{width:300px;aspect-ratio:9/16;top:0;transform:translateX(-50%);z-index:3;box-shadow:var(--shadow-2)}
@media(min-width:1440px){.phone-card.main{width:340px}}
.phone-card.main img{width:100%;height:100%;object-fit:cover}
.phone-cap{position:absolute;left:0;right:0;bottom:0;padding:44px 16px 18px;color:#fff;font-size:14px;font-weight:600;background:linear-gradient(180deg,rgba(11,11,13,0) 0%,rgba(11,11,13,.82) 70%)}
.phone-dur{position:absolute;top:14px;left:14px;background:rgba(11,11,13,.72);color:#fff;border-radius:6px;padding:3px 8px;font-family:var(--mono);font-size:12px;letter-spacing:.06em}
.phone-play{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:62px;height:62px;border-radius:50%;border:2px solid var(--accent);display:flex;align-items:center;justify-content:center;background:rgba(11,11,13,.28);transition:transform .2s var(--ease)}
.phone-play:hover{transform:translate(-50%,-50%) scale(1.08)}
.phone-bar{position:absolute;left:0;bottom:0;height:3px;background:var(--accent);width:0;animation:barRun 6s linear infinite}
@keyframes barRun{0%{width:0}100%{width:100%}}

/* ---------- 横滑片段 ---------- */
.rail-wrap{position:relative}
.rail-arrows{display:flex;gap:8px}
.circle-btn{width:40px;height:40px;border-radius:50%;border:1px solid var(--line);display:inline-flex;align-items:center;justify-content:center;transition:border-color .2s var(--ease),background .2s var(--ease)}
.circle-btn:hover{border-color:var(--accent);background:var(--paper-2)}
.rail{display:flex;gap:18px;overflow-x:auto;scroll-snap-type:x mandatory;padding:4px 0 14px;scrollbar-width:none}
.rail::-webkit-scrollbar{display:none}
.clip-card{position:relative;flex:0 0 168px;aspect-ratio:9/16;border-radius:18px;overflow:hidden;scroll-snap-align:start;background:var(--ink);outline:1px solid transparent;transition:transform .32s var(--ease),box-shadow .32s var(--ease),outline-color .32s var(--ease)}
@media(min-width:640px){.clip-card{flex:0 0 200px}}
@media(min-width:1024px){.clip-card{flex:0 0 240px}}
.clip-card img{width:100%;height:100%;object-fit:cover;opacity:.92;transition:transform .32s var(--ease)}
.clip-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-2);outline-color:var(--accent)}
.clip-card:hover img{transform:scale(1.04)}
.clip-meta{position:absolute;left:0;right:0;bottom:0;padding:48px 14px 16px;color:#fff;background:linear-gradient(180deg,rgba(11,11,13,0) 0%,rgba(11,11,13,.86) 72%)}
.clip-title{font-size:15px;font-weight:650;line-height:1.35;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.clip-info{display:block;margin-top:8px;font-family:var(--mono);font-size:11.5px;letter-spacing:.05em;color:rgba(255,255,255,.7)}
.clip-line{position:absolute;left:0;bottom:0;height:3px;width:38%;background:var(--accent)}
.clip-dur{position:absolute;top:12px;left:12px;background:rgba(11,11,13,.72);color:#fff;border-radius:6px;padding:3px 7px;font-family:var(--mono);font-size:11.5px}
.clip-play{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%) scale(.7);width:48px;height:48px;border-radius:50%;border:2px solid var(--accent);display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .2s var(--ease),transform .2s var(--ease)}
.clip-card:hover .clip-play{opacity:1;transform:translate(-50%,-50%) scale(1)}
.clip-more{flex:0 0 168px;aspect-ratio:9/16;border-radius:18px;border:1px dashed var(--line);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;color:var(--muted);font-size:14px;transition:border-color .2s var(--ease),color .2s var(--ease)}
@media(min-width:640px){.clip-more{flex:0 0 200px}}
@media(min-width:1024px){.clip-more{flex:0 0 240px}}
.clip-more:hover{border-color:var(--accent);color:var(--ink)}

/* ---------- 编号清单 ---------- */
.pick-list{border-top:1px solid var(--line)}
.pick-row{display:grid;grid-template-columns:44px 1fr 32px;gap:14px;align-items:center;padding:22px 0;border-bottom:1px solid var(--line);transition:background .2s var(--ease),transform .2s var(--ease)}
@media(min-width:640px){.pick-row{grid-template-columns:64px 1fr 36px;gap:20px;padding:26px 0}}
.pick-row:hover{background:var(--paper-2);transform:translateX(4px)}
.pick-num{font-family:var(--mono);font-size:24px;font-weight:700;color:#CFCABE;letter-spacing:.02em;transition:color .2s var(--ease)}
@media(min-width:640px){.pick-num{font-size:30px}}
.pick-row:hover .pick-num{color:var(--ink)}
.pick-row h3{font-size:17px;font-weight:650}
@media(min-width:640px){.pick-row h3{font-size:18px}}
.pick-points{margin-top:10px;display:grid;gap:6px}
.pick-points li{position:relative;padding-left:16px;font-size:14px;color:var(--muted)}
.pick-points li::before{content:"";position:absolute;left:0;top:12px;width:10px;height:1.5px;background:var(--accent)}
.pick-arrow{width:32px;height:32px;border-radius:50%;border:1px solid var(--line);display:flex;align-items:center;justify-content:center;transition:border-color .2s var(--ease),transform .2s var(--ease)}
.pick-row:hover .pick-arrow{border-color:var(--accent);transform:translateX(4px)}

/* ---------- 口碑跑马灯 ---------- */
.voice{background:var(--paper-2);border-radius:var(--r-block) var(--r-block) 0 0}
.score-chip{display:inline-flex;align-items:baseline;gap:8px;border:1px solid var(--ink);border-radius:999px;padding:6px 16px}
.score-chip b{font-family:var(--mono);font-size:18px}
.score-chip span{font-size:12px;color:var(--muted);letter-spacing:.06em}
.marquee{display:flex;flex-direction:column;gap:16px;overflow:hidden}
.marquee-row{display:flex;gap:16px;width:max-content;animation:runLeft 42s linear infinite}
.marquee-row.reverse{animation-name:runRight}
.marquee:hover .marquee-row{animation-play-state:paused}
@keyframes runLeft{from{transform:translateX(0)}to{transform:translateX(-50%)}}
@keyframes runRight{from{transform:translateX(-50%)}to{transform:translateX(0)}}
.voice-card{width:320px;flex:0 0 320px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px}
.voice-top{display:flex;align-items:center;gap:12px}
.avatar{width:36px;height:36px;border-radius:50%;background:var(--ink);color:var(--accent);display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;flex:0 0 auto}
.voice-name{font-size:14px;font-weight:650}
.stars{color:#B9A83A;font-size:12.5px;letter-spacing:.14em}
.voice-text{margin-top:12px;font-size:14px;color:var(--muted);line-height:1.7;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* ---------- 深色 CTA ---------- */
.cta-block{position:relative;overflow:hidden;background:var(--ink);color:#fff;border-radius:var(--r-block);padding:44px 28px}
@media(min-width:1024px){.cta-block{padding:64px}}
.cta-block::after{content:"";position:absolute;right:-40px;top:-60px;width:260px;height:260px;border-radius:50%;background:var(--accent);filter:blur(80px);opacity:.12;pointer-events:none}
.cta-grid{position:relative;z-index:1;display:grid;gap:32px}
@media(min-width:1024px){.cta-grid{grid-template-columns:7fr 5fr;align-items:center;gap:48px}}
.cta-block h2{font-size:clamp(1.6rem,3.4vw,2.5rem);font-weight:750}
.cta-block p{color:rgba(255,255,255,.68);margin-top:14px;font-size:15px}
.cta-checks{margin-top:24px;display:grid;gap:12px}
.cta-checks li{display:flex;align-items:center;gap:10px;font-size:14.5px;color:rgba(255,255,255,.85)}
.cta-checks svg{flex:0 0 auto}
.cta-actions{display:flex;flex-direction:column;gap:12px}
.cta-actions .btn{width:100%}

/* ---------- 最新信息（CMS） ---------- */
.news-grid{display:grid;gap:24px}
@media(min-width:640px){.news-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.news-grid{grid-template-columns:repeat(3,1fr)}}
.news-card{display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden;box-shadow:var(--shadow-1);transition:transform .32s var(--ease),box-shadow .32s var(--ease),border-color .32s var(--ease)}
.news-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-2);border-color:rgba(200,255,61,.6)}
.news-thumb{position:relative;aspect-ratio:16/10;overflow:hidden;background:var(--ink-2)}
.news-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .32s var(--ease)}
.news-card:hover .news-thumb img{transform:scale(1.04)}
.news-body{padding:20px;display:flex;flex-direction:column;gap:12px;flex:1}
.news-body h3{font-size:17px;font-weight:650;line-height:1.45;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-body p{font-size:14px;color:var(--muted);line-height:1.7;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.news-foot{margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:12px;padding-top:14px;border-top:1px solid var(--line);color:var(--muted)}
.news-foot .read{font-size:13.5px;font-weight:650;color:var(--ink);display:inline-flex;align-items:center;gap:6px}
.news-foot .read svg{transition:transform .2s var(--ease)}
.news-card:hover .read svg{transform:translateX(4px)}
.empty-state{min-height:240px;background:var(--paper-2);border:1px dashed var(--line);border-radius:var(--r-card);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;text-align:center;padding:32px}
.empty-state p{color:var(--muted);font-size:14.5px}

/* ---------- FAQ ---------- */
.faq-grid{display:grid;gap:0}
@media(min-width:1024px){.faq-grid{grid-template-columns:1fr 1fr;gap:0 48px;align-content:start}}
.faq-item{border-bottom:1px solid var(--line)}
.faq-item summary{position:relative;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:20px 0 20px 0;font-size:16px;font-weight:500;cursor:pointer;list-style:none;transition:background .2s var(--ease),padding .2s var(--ease)}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary:hover{background:var(--paper-2)}
.faq-item summary::before{content:"";position:absolute;left:0;top:12px;bottom:12px;width:3px;background:var(--accent);transform:scaleY(0);transform-origin:center;transition:transform .2s var(--ease)}
.faq-item[open] summary::before{transform:scaleY(1)}
.faq-item[open] summary{padding-left:14px}
.faq-item summary svg{flex:0 0 auto;transition:transform .32s var(--ease)}
.faq-item[open] summary svg{transform:rotate(180deg)}
.faq-answer{padding:0 0 18px;font-size:15px;color:var(--muted);line-height:1.8}
.faq-item[open] .faq-answer{padding-left:14px}

/* ---------- 表单 ---------- */
.form-card{background:#fff;border:1px solid var(--line);border-radius:var(--r-block);padding:28px;box-shadow:var(--shadow-1)}
@media(min-width:1024px){.form-card{padding:40px}}
.form-grid{display:grid;gap:18px;margin-top:24px}
@media(min-width:640px){.form-grid{grid-template-columns:1fr 1fr}}
.field{display:flex;flex-direction:column;gap:8px}
.field.full{grid-column:1/-1}
.field label{font-size:13px;color:var(--muted)}
.field input,.field textarea{height:48px;border:1px solid var(--line);border-radius:var(--r-input);padding:0 14px;background:var(--paper);transition:border-color .2s var(--ease),box-shadow .2s var(--ease)}
.field textarea{height:112px;padding:12px 14px;resize:vertical;line-height:1.7}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(200,255,61,.25)}
.form-actions{margin-top:22px;display:flex;flex-wrap:wrap;align-items:center;gap:16px}
.form-note{font-size:13px;color:var(--muted)}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--ink);color:#fff;border-radius:var(--r-block) var(--r-block) 0 0;padding:56px 0 0;margin-top:16px}
@media(min-width:1024px){.site-footer{padding-top:72px}}
.footer-grid{display:grid;gap:36px}
@media(min-width:640px){.footer-grid{grid-template-columns:1fr 1fr}}
@media(min-width:1024px){.footer-grid{grid-template-columns:1.4fr 1fr 1fr 1.4fr;gap:40px}}
.footer-brand .logo-text b{color:#fff}
.footer-brand .logo-text em{color:rgba(255,255,255,.6)}
.footer-desc{margin-top:16px;font-size:14px;color:rgba(255,255,255,.66);line-height:1.8;max-width:22em}
.socials{display:flex;gap:10px;margin-top:20px}
.socials a{width:38px;height:38px;border:1px solid rgba(255,255,255,.24);border-radius:10px;display:flex;align-items:center;justify-content:center;transition:border-color .2s var(--ease),background .2s var(--ease)}
.socials a:hover{border-color:var(--accent);background:rgba(200,255,61,.08)}
.footer-col h3{font-size:14px;font-weight:700;letter-spacing:.06em;color:#fff;margin-bottom:16px}
.footer-col ul{display:grid;gap:12px}
.footer-col a{font-size:14px;color:rgba(255,255,255,.7);transition:color .2s var(--ease)}
.footer-col a:hover{color:#fff;text-decoration:underline;text-decoration-color:var(--accent);text-decoration-thickness:2px;text-underline-offset:4px}
.footer-form{display:flex;flex-direction:column;gap:12px;margin-top:4px}
.footer-form input{height:46px;border-radius:var(--r-input);border:1px solid rgba(255,255,255,.2);background:rgba(255,255,255,.06);padding:0 14px;color:#fff;transition:border-color .2s var(--ease)}
.footer-form input::placeholder{color:rgba(255,255,255,.45)}
.footer-form input:focus{outline:none;border-color:var(--accent)}
.footer-bottom{margin-top:48px;border-top:1px solid rgba(255,255,255,.14);padding:22px 0;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;font-size:13px;color:rgba(255,255,255,.55)}
.to-top{width:40px;height:40px;border-radius:50%;border:1px solid rgba(255,255,255,.25);display:inline-flex;align-items:center;justify-content:center;transition:background .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease)}
.to-top:hover{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}

/* ---------- 移动端吸底 ---------- */
.sticky-cta{position:fixed;left:0;right:0;bottom:0;z-index:70;display:none;align-items:center;justify-content:space-between;gap:14px;height:64px;padding:0 16px;background:rgba(250,249,246,.86);backdrop-filter:blur(8px);border-top:1px solid var(--line);transform:translateY(110%);transition:transform .32s var(--ease)}
.sticky-cta.show{transform:translateY(0)}
.sticky-cta span{font-size:13.5px;color:var(--ink)}
@media(max-width:639px){.sticky-cta{display:flex}}

@media(prefers-reduced-motion:reduce){
  *{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  html{scroll-behavior:auto}
}

/* roulang page: category1 */
:root{
  --ink:#111114;
  --ink-2:#1B1B21;
  --paper:#FAF9F6;
  --paper-2:#F1EEE7;
  --line:#E2DED5;
  --muted:#6C6C74;
  --accent:#C8FF3D;
  --accent-ink:#0B0B0D;
  --accent-2:#6B4EFF;
  --danger:#E5484D;
  --shadow-1:0 1px 2px rgba(17,17,20,.04),0 8px 24px rgba(17,17,20,.06);
  --shadow-2:0 12px 40px rgba(17,17,20,.12);
  --ease:cubic-bezier(.2,.7,.2,1);
  --r-card:18px;
  --r-img:16px;
  --r-input:12px;
  --r-block:28px;
  --sans:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:ui-monospace,"SFMono-Regular","JetBrains Mono",Consolas,"Liberation Mono",monospace;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--sans);
  font-size:15px;
  line-height:1.8;
  color:var(--ink);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none;transition:color 200ms var(--ease),background-color 200ms var(--ease),border-color 200ms var(--ease)}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p,figure{margin:0}
button,input,textarea,select{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}
.mono{font-family:var(--mono);font-size:12.5px;letter-spacing:.04em}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}

/* ============ 顶部信息条 ============ */
.topbar{background:var(--ink);color:rgba(255,255,255,.72);font-size:12.5px}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;height:36px;white-space:nowrap}
.topbar-left{display:flex;align-items:center;gap:10px;min-width:0}
.topbar-domain{font-family:var(--mono);font-size:12.5px;letter-spacing:.04em;color:rgba(255,255,255,.86)}
.topbar-sep{display:none;width:1px;height:12px;background:rgba(255,255,255,.28)}
.topbar-tip{display:none;overflow:hidden;text-overflow:ellipsis}
.topbar-right{display:flex;align-items:center;gap:16px;margin-left:auto}
.topbar-right a{color:rgba(255,255,255,.72)}
.topbar-right a:hover{color:#fff;text-decoration:underline;text-decoration-color:var(--accent);text-decoration-thickness:2px;text-underline-offset:4px}
.topbar-right a + a{display:none}

/* ============ 主导航 ============ */
.site-header{position:relative;z-index:60}
.mainnav{
  position:sticky;top:0;z-index:50;
  background:var(--paper);
  border-bottom:1px solid var(--line);
  transition:box-shadow 320ms var(--ease);
}
.mainnav.is-scrolled{box-shadow:var(--shadow-1)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:14px;height:68px;transition:height 320ms var(--ease)}
.mainnav.is-scrolled .nav-inner{height:56px}
.logo{display:inline-flex;align-items:center;gap:10px;flex:none}
.logo-mark{
  width:18px;height:18px;background:var(--accent);flex:none;
  clip-path:polygon(0 0,100% 0,100% 62%,62% 100%,0 100%);
}
.logo-text{display:flex;flex-direction:column;line-height:1.12}
.logo-text b{font-size:16px;font-weight:800;letter-spacing:-.01em}
.logo-text em{font-style:normal;font-size:11.5px;color:var(--muted);letter-spacing:.02em}
.nav-menu{
  position:fixed;top:0;right:0;bottom:0;width:88vw;max-width:400px;
  display:flex;flex-direction:column;
  background:var(--paper);border-left:1px solid var(--line);
  padding:104px 26px 32px;overflow-y:auto;
  transform:translateX(102%);transition:transform 320ms var(--ease);
  box-shadow:var(--shadow-2);z-index:70;
}
.nav-open .nav-menu{transform:translateX(0)}
.nav-menu li{border-bottom:1px solid var(--line)}
.nav-menu a{display:block;line-height:56px;font-size:19px;font-weight:500;color:var(--ink)}
.nav-menu a:hover{color:var(--ink)}
.nav-menu a:hover::after{transform:scaleX(1)}
.nav-menu a.active{font-weight:800}
.nav-actions{display:flex;align-items:center;gap:10px;flex:none}
.icon-btn{
  width:38px;height:38px;border-radius:999px;border:1px solid var(--line);
  background:transparent;display:none;align-items:center;justify-content:center;
  cursor:pointer;color:var(--ink);transition:border-color 200ms var(--ease),background-color 200ms var(--ease)
}
.icon-btn:hover{border-color:var(--accent);background:var(--paper-2)}
.hamburger{
  width:40px;height:40px;border-radius:999px;border:1px solid var(--line);
  background:transparent;display:inline-flex;align-items:center;justify-content:center;
  cursor:pointer;position:relative;z-index:80
}
.hamburger span{display:block;width:16px;height:2px;background:var(--ink);position:relative;transition:background-color 200ms var(--ease)}
.hamburger span::before,.hamburger span::after{content:"";position:absolute;left:0;width:16px;height:2px;background:var(--ink);transition:transform 200ms var(--ease)}
.hamburger span::before{top:-5px}
.hamburger span::after{top:5px}
.nav-open .hamburger span{background:transparent}
.nav-open .hamburger span::before{transform:translateY(5px) rotate(45deg)}
.nav-open .hamburger span::after{transform:translateY(-5px) rotate(-45deg)}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 22px;border-radius:999px;border:1px solid transparent;
  font-size:15px;font-weight:600;cursor:pointer;white-space:nowrap;
  transition:background-color 200ms var(--ease),color 200ms var(--ease),border-color 200ms var(--ease),transform 200ms var(--ease)
}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--accent);color:var(--accent-ink)}
.btn-primary:hover{background:var(--ink);color:var(--accent)}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--ink)}
.btn-ghost:hover{border-color:var(--accent);background:var(--paper-2)}
.btn-on-dark{background:transparent;border-color:rgba(255,255,255,.32);color:#fff}
.btn-on-dark:hover{border-color:var(--accent);color:var(--accent)}
.btn-sm{height:38px;padding:0 16px;font-size:14px}
.link-arrow{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--ink)}
.link-arrow svg{transition:transform 200ms var(--ease)}
.link-arrow:hover svg{transform:translateX(4px)}
.link-arrow:hover{text-decoration:underline;text-decoration-color:var(--accent);text-decoration-thickness:2px;text-underline-offset:4px}

/* ============ 通用板块 ============ */
.section{padding:56px 0}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:18px;flex-wrap:wrap;margin-bottom:28px}
.section-head h2{font-size:clamp(1.5rem,3.4vw,2.1rem);line-height:1.15;font-weight:750;letter-spacing:-.01em}
.section-sub{margin-top:8px;color:var(--muted);font-size:14px;max-width:56ch}
.eyebrow{
  display:inline-flex;align-items:center;gap:6px;height:26px;padding:0 12px;
  border-radius:999px;background:var(--accent);color:var(--accent-ink);
  font-size:12.5px;font-weight:700;letter-spacing:.02em
}
.badge{
  display:inline-block;padding:4px 10px;border-radius:6px;border:1px solid var(--line);
  font-size:11.5px;letter-spacing:.06em;font-weight:600;line-height:1.4
}
.badge-accent{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
.badge-violet{background:transparent;color:var(--accent-2);border-color:rgba(107,78,255,.42)}
.badge-ink{background:var(--ink);color:#fff;border-color:var(--ink)}

/* ============ 分类 Hero ============ */
.page-hero{
  position:relative;overflow:hidden;background:var(--paper);
  background-image:repeating-linear-gradient(115deg,rgba(17,17,20,.04) 0 1px,transparent 1px 15px);
  padding:34px 0 40px
}
.page-hero::after{
  content:"";position:absolute;right:-70px;bottom:-90px;width:220px;height:220px;border-radius:50%;
  background:var(--accent);opacity:.1;filter:blur(60px);pointer-events:none
}
.hero-grid{position:relative;display:grid;grid-template-columns:1fr;gap:26px;align-items:center;z-index:1}
.crumbs{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--muted);overflow-x:auto;white-space:nowrap;margin-bottom:16px}
.crumbs a:hover{color:var(--ink)}
.crumbs span:last-child{color:var(--ink)}
.hero-copy h1{
  font-size:clamp(1.85rem,5vw,2.7rem);
  line-height:1.1;letter-spacing:-.02em;font-weight:800;margin:14px 0 12px
}
.hero-lead{color:var(--muted);font-size:15px;max-width:52ch}
.hero-figure{border-radius:20px;overflow:hidden;box-shadow:var(--shadow-1);background:var(--paper-2)}
.hero-figure img{width:100%;aspect-ratio:16/9;object-fit:cover}

/* ============ 概览四卡 ============ */
.overview-grid{display:grid;grid-template-columns:1fr;gap:20px}
.ov-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-card);
  padding:24px;min-height:168px;display:flex;flex-direction:column;gap:12px;
  box-shadow:var(--shadow-1);
  transition:transform 320ms var(--ease),box-shadow 320ms var(--ease),border-color 320ms var(--ease)
}
.ov-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-2);border-color:rgba(200,255,61,.65)}
.ov-icon{
  width:44px;height:44px;border-radius:12px;background:var(--paper-2);
  display:inline-flex;align-items:center;justify-content:center;color:var(--ink);flex:none
}
.ov-card h3{font-size:17px;font-weight:700;line-height:1.3}
.ov-card p{font-size:14px;color:var(--muted);line-height:1.72}

/* ============ 编号清单 ============ */
.steps{border-top:1px solid var(--line)}
.step{
  display:grid;grid-template-columns:40px 68px 1fr 32px;gap:14px;align-items:center;
  padding:18px 6px;border-bottom:1px solid var(--line);
  transition:background-color 320ms var(--ease),transform 320ms var(--ease)
}
.step:hover{background:var(--paper-2);transform:translateX(4px)}
.step-no{
  font-family:var(--mono);font-size:20px;font-weight:700;letter-spacing:.02em;
  color:rgba(17,17,20,.22);transition:color 320ms var(--ease)
}
.step:hover .step-no{color:var(--accent-ink);background:var(--accent);border-radius:8px;text-align:center}
.step-thumb{width:68px;height:68px;border-radius:14px;object-fit:cover;background:var(--paper-2)}
.step-body h3{font-size:17px;font-weight:650;line-height:1.35;margin-bottom:6px}
.step-points li{position:relative;padding-left:16px;font-size:13.5px;color:var(--muted);line-height:1.85}
.step-points li::before{content:"";position:absolute;left:0;top:.72em;width:12px;height:2px;background:var(--accent)}
.step-go{
  width:32px;height:32px;border-radius:999px;border:1px solid var(--line);
  display:inline-flex;align-items:center;justify-content:center;color:var(--ink);
  transition:border-color 200ms var(--ease),background-color 200ms var(--ease)
}
.step:hover .step-go{border-color:var(--accent);background:var(--accent);color:var(--accent-ink)}

/* ============ 延伸阅读 ============ */
.readmore{
  margin-top:24px;padding:22px;border:1px dashed var(--line);border-radius:var(--r-card);
  background:var(--paper-2);display:flex;flex-direction:column;gap:12px
}
.readmore h3{font-size:14px;font-weight:700;letter-spacing:.06em;color:var(--muted)}
.readmore-links{display:flex;flex-wrap:wrap;gap:10px 26px}
.readmore-links a{font-size:14.5px;font-weight:600;border-bottom:1px solid var(--line);padding-bottom:2px}
.readmore-links a:hover{border-color:var(--accent);color:var(--ink)}

/* ============ FAQ ============ */
.faq-list{border-top:1px solid var(--line);max-width:900px}
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  min-height:64px;padding:14px 10px;background:transparent;border:0;text-align:left;
  font-size:16px;font-weight:500;cursor:pointer;transition:background-color 200ms var(--ease)
}
.faq-q:hover{background:var(--paper-2)}
.faq-q span{position:relative;padding-left:0;transition:padding-left 200ms var(--ease)}
.faq-q span::before{
  content:"";position:absolute;left:0;top:50%;width:3px;height:0;background:var(--accent);
  transform:translateY(-50%);transition:height 220ms var(--ease)
}
.faq-item.open .faq-q span{padding-left:14px}
.faq-item.open .faq-q span::before{height:16px}
.faq-arrow{flex:none;color:var(--muted);transition:transform 260ms var(--ease)}
.faq-item.open .faq-arrow{transform:rotate(180deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height 320ms var(--ease)}
.faq-item.open .faq-a{max-height:420px}
.faq-a p{font-size:15px;line-height:1.8;color:var(--muted);padding:0 10px 18px}

/* ============ 浅色 CTA 条 ============ */
.cta-lite-box{
  background:var(--paper-2);border-radius:var(--r-block);
  padding:32px 24px;display:flex;flex-direction:column;gap:22px
}
.cta-lite-box h2{font-size:clamp(1.4rem,3vw,1.9rem);line-height:1.2;font-weight:750}
.cta-lite-box p{color:var(--muted);font-size:14.5px;margin-top:8px;max-width:56ch}
.cta-lite-actions{display:flex;flex-wrap:wrap;gap:12px}

/* ============ 页脚 ============ */
.site-footer{
  background:#111114;color:rgba(255,255,255,.7);
  border-radius:32px 32px 0 0;padding:56px 0 24px;margin-top:64px
}
.site-footer a{color:rgba(255,255,255,.7)}
.site-footer a:hover{color:#fff;text-decoration:underline;text-decoration-color:var(--accent);text-decoration-thickness:2px;text-underline-offset:4px}
.footer-grid{display:grid;grid-template-columns:1fr;gap:36px}
.footer-brand .logo-text b{color:#fff}
.footer-brand .logo-text em{color:rgba(255,255,255,.55)}
.footer-desc{margin:16px 0 18px;font-size:14px;line-height:1.8;color:rgba(255,255,255,.6);max-width:34ch}
.socials{display:flex;gap:10px}
.socials a{
  width:38px;height:38px;border-radius:12px;border:1px solid rgba(255,255,255,.18);
  display:inline-flex;align-items:center;justify-content:center
}
.socials a:hover{border-color:var(--accent);background:rgba(200,255,61,.08)}
.footer-col h3{color:#fff;font-size:14px;font-weight:700;letter-spacing:.04em;margin-bottom:16px}
.footer-col ul li{margin-bottom:10px}
.footer-col ul a{font-size:14px}
.footer-form{display:flex;flex-direction:column;gap:10px;max-width:280px}
.footer-form label{font-family:var(--mono);font-size:12px;letter-spacing:.04em;color:rgba(255,255,255,.6)}
.footer-form input{
  height:48px;border-radius:var(--r-input);border:1px solid rgba(255,255,255,.18);
  background:var(--ink-2);color:#fff;padding:0 14px;font-size:14px;
  transition:border-color 200ms var(--ease),box-shadow 200ms var(--ease)
}
.footer-form input::placeholder{color:rgba(255,255,255,.42)}
.footer-form input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(200,255,61,.25)}
.footer-form .btn{align-self:flex-start}
.footer-bottom{
  margin-top:44px;padding-top:20px;border-top:1px solid rgba(255,255,255,.12);
  display:flex;flex-direction:column;gap:14px;font-size:12.5px;color:rgba(255,255,255,.5)
}
.to-top{
  width:40px;height:40px;border-radius:999px;border:1px solid rgba(255,255,255,.2);
  display:inline-flex;align-items:center;justify-content:center;color:#fff;align-self:flex-start
}
.to-top:hover{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}

/* ============ 响应式 ============ */
@media (min-width:640px){
  body{font-size:16px}
  .container{padding:0 24px}
  .topbar-sep,.topbar-tip{display:block}
  .topbar-right a + a{display:inline}
  .section{padding:72px 0}
  .hero-grid{grid-template-columns:1.05fr .95fr;gap:34px}
  .hero-figure img{aspect-ratio:4/3}
  .overview-grid{grid-template-columns:repeat(2,1fr)}
  .step{grid-template-columns:52px 96px 1fr 40px;gap:20px;padding:22px 10px}
  .step-thumb{width:96px;height:96px}
  .step-points{display:flex;flex-wrap:wrap;gap:0 22px}
  .footer-grid{grid-template-columns:repeat(2,1fr);gap:40px}
  .footer-bottom{flex-direction:row;align-items:center;justify-content:space-between}
  .to-top{align-self:auto}
  .cta-lite-box{padding:40px 40px;flex-direction:row;align-items:center;justify-content:space-between}
  .cta-lite-actions{flex:none}
}
@media (min-width:1024px){
  .container{padding:0 32px}
  .nav-menu{
    position:static;transform:none;flex-direction:row;align-items:center;gap:28px;
    width:auto;max-width:none;background:transparent;border:0;padding:0;box-shadow:none;overflow:visible
  }
  .nav-menu li{border:0}
  .nav-menu a{line-height:1;font-size:15px;font-weight:500;padding:6px 0;position:relative}
  .nav-menu a::after{
    content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;background:var(--accent);
    transform:scaleX(0);transform-origin:left;transition:transform 220ms var(--ease)
  }
  .nav-menu a:hover::after{transform:scaleX(1)}
  .nav-menu a.active::before{
    content:"";position:absolute;left:-10px;top:50%;transform:translateY(-50%);
    width:4px;height:14px;background:var(--accent)
  }
  .hamburger{display:none}
  .icon-btn{display:inline-flex}
  .section{padding:96px 0}
  .page-hero{padding:40px 0 52px}
  .hero-copy h1{font-size:clamp(2.1rem,3.4vw,2.9rem)}
  .hero-figure img{aspect-ratio:16/10}
  .overview-grid{grid-template-columns:repeat(4,1fr)}
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:48px}
  .site-footer{padding:72px 0 28px}
}
@media (min-width:1440px){
  .container{max-width:1280px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition-property:color,background-color,border-color,box-shadow!important}
  html{scroll-behavior:auto}
  .ov-card:hover,.step:hover{transform:none}
}

/* roulang page: article */
/* ============ 设计令牌 ============ */
:root{
  --ink:#111114;
  --ink-2:#1B1B21;
  --paper:#FAF9F6;
  --paper-2:#F1EEE7;
  --line:#E2DED5;
  --muted:#6C6C74;
  --accent:#C8FF3D;
  --accent-ink:#0B0B0D;
  --accent-2:#6B4EFF;
  --danger:#E5484D;
  --radius-card:18px;
  --radius-img:16px;
  --radius-block:28px;
  --shadow-1:0 1px 2px rgba(17,17,20,.04), 0 8px 24px rgba(17,17,20,.06);
  --shadow-2:0 12px 40px rgba(17,17,20,.12);
  --ease:cubic-bezier(.2,.7,.2,1);
  --font-sans:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular","JetBrains Mono",Consolas,monospace;
}
/* ============ 基础 reset ============ */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;border-style:none}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer}
input,textarea,select{font-family:inherit;font-size:inherit}
h1,h2,h3,h4,p,figure,blockquote{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.mono{font-family:var(--font-mono);letter-spacing:.04em;font-size:12.5px}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
@media (min-width:1024px){.container{padding:0 32px}}
@media (min-width:1440px){.container{max-width:1280px}}

/* ============ 顶部信息条 ============ */
.topbar{height:36px;background:var(--ink);color:rgba(255,255,255,.72);font-size:12.5px;display:flex;align-items:center}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;width:100%;overflow-x:auto;white-space:nowrap}
.topbar-left{display:flex;align-items:center;gap:12px;min-width:0}
.topbar-domain{font-family:var(--font-mono);letter-spacing:.04em;color:rgba(255,255,255,.9)}
.topbar-sep{width:1px;height:12px;background:rgba(255,255,255,.24)}
.topbar-tip{overflow:hidden;text-overflow:ellipsis}
.topbar-right{display:flex;align-items:center;gap:18px}
.topbar-right a{color:rgba(255,255,255,.72);transition:color .2s var(--ease)}
.topbar-right a:hover{color:#fff;text-decoration:underline;text-decoration-color:var(--accent);text-decoration-thickness:2px;text-underline-offset:4px}
@media (max-width:639px){.topbar-tip{display:none}}

/* ============ 主导航 ============ */
.site-header{position:sticky;top:-36px;z-index:60}
.mainnav{background:var(--paper);border-bottom:1px solid var(--line);transition:box-shadow .3s var(--ease)}
.mainnav.is-stuck{box-shadow:var(--shadow-1)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;height:68px;transition:height .3s var(--ease)}
.mainnav.is-shrunk .nav-inner{height:56px}
.logo{display:flex;align-items:center;gap:10px;flex-shrink:0}
.logo-mark{width:18px;height:18px;background:var(--accent);border-radius:3px;clip-path:polygon(0 0,100% 0,100% 72%,72% 100%,0 100%);flex-shrink:0}
.logo-text{display:flex;flex-direction:column;line-height:1.15}
.logo-text b{font-size:17px;font-weight:800;letter-spacing:-.01em}
.logo-text em{font-style:normal;font-size:12px;color:var(--muted);letter-spacing:.02em}
.nav-menu{display:none;align-items:center;gap:28px}
.nav-menu a{position:relative;font-size:15px;color:var(--ink);padding:6px 0;transition:color .2s var(--ease)}
.nav-menu a::after{content:"";position:absolute;left:0;bottom:0;height:2px;width:0;background:var(--accent);transition:width .32s var(--ease)}
.nav-menu a:hover::after{width:100%}
.nav-menu a.active{font-weight:700}
.nav-menu a.active::before{content:"";position:absolute;left:-12px;top:50%;transform:translateY(-50%);width:4px;height:14px;background:var(--accent);border-radius:1px}
.nav-actions{display:flex;align-items:center;gap:12px}
.icon-btn{width:38px;height:38px;border-radius:50%;border:1px solid var(--line);background:transparent;color:var(--ink);display:inline-flex;align-items:center;justify-content:center;transition:border-color .2s var(--ease),color .2s var(--ease)}
.icon-btn:hover{border-color:var(--accent);color:var(--ink)}
.nav-cta{display:none}
.hamburger{width:38px;height:38px;border:1px solid var(--line);border-radius:10px;background:transparent;display:inline-flex;flex-direction:column;align-items:center;justify-content:center;gap:5px}
.hamburger span{display:block;width:16px;height:2px;background:var(--ink);border-radius:2px;transition:transform .3s var(--ease),opacity .3s var(--ease)}
.hamburger.is-open span:first-child{transform:translateY(3.5px) rotate(45deg)}
.hamburger.is-open span:last-child{transform:translateY(-3.5px) rotate(-45deg)}
@media (min-width:1024px){
  .nav-menu{display:flex}
  .nav-cta{display:inline-flex}
  .hamburger{display:none}
}
/* 移动面板 */
.mobile-panel{position:fixed;top:0;right:0;width:88vw;max-width:420px;height:100vh;background:var(--paper);border-left:1px solid var(--line);box-shadow:var(--shadow-2);transform:translateX(100%);transition:transform .32s var(--ease);z-index:80;display:flex;flex-direction:column;padding:24px 22px}
.mobile-panel.is-open{transform:translateX(0)}
.mobile-panel .panel-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}
.mobile-panel nav{display:flex;flex-direction:column}
.mobile-panel nav a{font-size:20px;line-height:56px;border-bottom:1px solid var(--line);font-weight:600}
.mobile-panel nav a.active{color:var(--ink);border-left:4px solid var(--accent);padding-left:12px}
.mobile-panel .panel-cta{margin-top:auto;width:100%}
@media (min-width:1024px){.mobile-panel{display:none}}
.backdrop{position:fixed;inset:0;background:rgba(17,17,20,.4);opacity:0;visibility:hidden;transition:opacity .3s var(--ease);z-index:70}
.backdrop.is-open{opacity:1;visibility:visible}

/* ============ 按钮 ============ */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:999px;border:1px solid transparent;padding:13px 26px;font-size:15px;font-weight:600;transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);white-space:nowrap}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--accent);color:var(--accent-ink)}
.btn-primary:hover{background:var(--ink);color:var(--accent)}
.btn-outline{border-color:var(--line);color:var(--ink);background:transparent}
.btn-outline:hover{border-color:var(--accent);background:var(--paper-2)}
.btn-sm{padding:9px 18px;font-size:14px}
.btn-ghost{background:transparent;color:var(--ink);padding-left:0;padding-right:0}
.link-arrow{display:inline-flex;align-items:center;gap:6px;font-size:14px;color:var(--ink);font-weight:600}
.link-arrow svg{transition:transform .2s var(--ease)}
.link-arrow:hover svg{transform:translateX(4px)}
.link-arrow:hover{text-decoration:underline;text-decoration-color:var(--accent);text-decoration-thickness:2px;text-underline-offset:4px}

/* ============ 徽章与标签 ============ */
.badge{display:inline-flex;align-items:center;padding:4px 10px;border-radius:6px;border:1px solid var(--line);font-size:11.5px;letter-spacing:.06em;color:var(--muted);background:var(--paper);font-weight:600}
.badge-accent{border-color:var(--accent);color:var(--ink);background:rgba(200,255,61,.18)}
.badge-violet{border-color:rgba(107,78,255,.4);color:var(--accent-2);background:rgba(107,78,255,.07)}
.tag-list{display:flex;flex-wrap:wrap;gap:10px}
.tag{display:inline-flex;padding:7px 14px;border-radius:999px;border:1px solid var(--line);font-size:13px;color:var(--ink);transition:border-color .2s var(--ease),background .2s var(--ease)}
.tag:hover{border-color:var(--accent);background:var(--paper-2)}

/* ============ 阅读进度条 ============ */
.reading-progress{position:absolute;left:0;bottom:-1px;height:2px;width:0;background:var(--accent);transition:width .1s linear}

/* ============ 面包屑 ============ */
.crumb-bar{border-bottom:1px solid var(--line);background:var(--paper)}
.crumbs{display:flex;align-items:center;gap:10px;height:52px;font-size:13px;color:var(--muted);white-space:nowrap;overflow-x:auto}
.crumbs a{color:var(--muted);transition:color .2s var(--ease)}
.crumbs a:hover{color:var(--ink);text-decoration:underline;text-decoration-color:var(--accent);text-decoration-thickness:2px;text-underline-offset:4px}
.crumbs .sep{color:var(--line)}
.crumbs .current{color:var(--ink);font-weight:600;overflow:hidden;text-overflow:ellipsis;max-width:52vw}

/* ============ 文章标题区 ============ */
.post-head{padding:56px 0 0}
@media (min-width:640px){.post-head{padding:72px 0 0}}
@media (min-width:1024px){.post-head{padding:88px 0 0}}
.post-head-inner{max-width:820px}
.post-badge-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:20px}
.post-title{font-size:clamp(1.8rem,4.6vw,2.8rem);line-height:1.14;font-weight:800;letter-spacing:-.02em;max-width:19ch;overflow-wrap:break-word}
.post-metas{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:22px;color:var(--muted)}
.post-metas .dot{color:var(--line)}
.post-cover{margin:36px 0 0}
.post-cover img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:20px}
.post-cover figcaption{font-size:13px;color:var(--muted);text-align:center;margin-top:12px}

/* ============ 正文阅读区 ============ */
.post-wrap{padding:48px 0 0}
@media (min-width:1024px){.post-wrap{padding:56px 0 0}}
.post-body{max-width:720px;margin:0 auto;font-size:17px;line-height:1.9;color:var(--ink);overflow-wrap:break-word}
.post-body p{margin:0 0 1.4em}
.post-body h2{position:relative;padding-left:18px;font-size:clamp(1.3rem,2.4vw,1.7rem);line-height:1.3;font-weight:750;margin:2.4em 0 .9em}
.post-body h2::before{content:"";position:absolute;left:0;top:.3em;width:4px;height:1em;background:var(--accent);border-radius:2px}
.post-body h3{font-size:1.25rem;line-height:1.35;font-weight:650;margin:1.8em 0 .7em}
.post-body h4{font-size:1.05rem;font-weight:650;margin:1.5em 0 .6em}
.post-body ul,.post-body ol{margin:0 0 1.4em}
.post-body ul li{position:relative;padding-left:20px;margin:.6em 0}
.post-body ul li::before{content:"";position:absolute;left:0;top:.78em;width:7px;height:7px;border-radius:50%;background:var(--accent)}
.post-body ol{counter-reset:nlist}
.post-body ol li{position:relative;padding-left:32px;margin:.6em 0;counter-increment:nlist}
.post-body ol li::before{content:counter(nlist,decimal-leading-zero);position:absolute;left:0;top:.42em;font-family:var(--font-mono);font-size:12.5px;color:var(--muted);letter-spacing:.04em}
.post-body blockquote{margin:1.7em 0;padding:18px 22px;background:var(--paper-2);border-left:3px solid var(--accent);border-radius:0 12px 12px 0;color:var(--ink-2);font-style:normal}
.post-body blockquote p:last-child{margin-bottom:0}
.post-body img{border-radius:var(--radius-img);margin:1.6em auto}
.post-body figure{margin:1.8em 0}
.post-body figcaption{font-size:13px;color:var(--muted);text-align:center;margin-top:10px;line-height:1.6}
.post-body a{color:var(--ink);text-decoration:underline;text-decoration-color:var(--accent);text-decoration-thickness:2px;text-underline-offset:4px;transition:font-weight .15s var(--ease)}
.post-body a:hover{font-weight:600}
.post-body strong{font-weight:700}
.post-body code{background:var(--paper-2);border:1px solid var(--line);padding:2px 6px;border-radius:6px;font-family:var(--font-mono);font-size:.86em}
.post-body pre{background:var(--ink);color:#F4F4F2;padding:18px 20px;border-radius:14px;overflow-x:auto;font-family:var(--font-mono);font-size:14px;line-height:1.7;margin:1.6em 0}
.post-body pre code{background:transparent;border:0;padding:0;color:inherit}
.post-body table{width:100%;border-collapse:collapse;border:1px solid var(--line);font-size:15px;margin:1.6em 0;border-radius:12px;overflow:hidden}
.post-body th{background:var(--paper-2);text-align:left;font-weight:650}
.post-body th,.post-body td{border:1px solid var(--line);padding:11px 14px}
.post-body hr{border:0;border-top:1px solid var(--line);margin:2.4em 0}
@media (max-width:639px){
  .post-body{font-size:15px;line-height:1.85}
  .post-body table{display:block;overflow-x:auto;white-space:nowrap}
}

/* ============ 文末标签与分享 ============ */
.post-foot{max-width:720px;margin:0 auto;padding:36px 0 0;border-top:1px solid var(--line);margin-top:44px;display:flex;flex-wrap:wrap;gap:20px;justify-content:space-between;align-items:center}
.share-row{display:flex;align-items:center;gap:10px}
.share-label{font-size:13px;color:var(--muted)}
.share-btn{width:38px;height:38px;border-radius:10px;border:1px solid var(--line);background:transparent;color:var(--ink);display:inline-flex;align-items:center;justify-content:center;transition:border-color .2s var(--ease),background .2s var(--ease)}
.share-btn:hover{border-color:var(--accent);background:var(--paper-2)}

/* ============ 相关推荐 ============ */
.related{padding:72px 0 0}
@media (min-width:1024px){.related{padding:96px 0 0}}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:28px}
.section-head h2{font-size:clamp(1.4rem,2.6vw,1.9rem);font-weight:750;line-height:1.2;letter-spacing:-.01em}
.section-head p{font-size:14px;color:var(--muted);margin-top:8px}
.card-grid{display:grid;grid-template-columns:1fr;gap:24px}
@media (min-width:640px){.card-grid{grid-template-columns:repeat(2,1fr)}}
@media (min-width:1024px){.card-grid{grid-template-columns:repeat(3,1fr)}}
.card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius-card);box-shadow:var(--shadow-1);overflow:hidden;transition:transform .32s var(--ease),box-shadow .32s var(--ease),border-color .32s var(--ease)}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-2);border-color:rgba(200,255,61,.5)}
.card-link{display:flex;flex-direction:column;height:100%}
.card-thumb{overflow:hidden;aspect-ratio:16/10;background:var(--paper-2)}
.card-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .4s var(--ease)}
.card:hover .card-thumb img{transform:scale(1.04)}
.card-body{padding:20px;display:flex;flex-direction:column;gap:12px;flex:1}
.card-body h3{font-size:16px;font-weight:650;line-height:1.45;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card-body p{font-size:14px;color:var(--muted);line-height:1.72;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.card-foot{margin-top:auto;display:flex;align-items:center;justify-content:space-between;color:var(--muted);padding-top:6px}
.card-foot .read{color:var(--ink);font-weight:600}

/* ============ 空态 ============ */
.empty-state{min-height:240px;background:var(--paper-2);border:1px dashed var(--line);border-radius:var(--radius-card);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;text-align:center;padding:36px 20px;color:var(--muted)}
.empty-state svg{color:var(--muted)}
.empty-state p{font-size:15px;color:var(--ink)}

/* ============ 返回入口 ============ */
.back-cta{padding:72px 0 0}
@media (min-width:1024px){.back-cta{padding:96px 0 0}}
.back-box{background:var(--ink);color:#F4F4F2;border-radius:var(--radius-block);padding:40px 28px;display:flex;flex-direction:column;gap:24px;align-items:flex-start;position:relative;overflow:hidden}
.back-box::after{content:"";position:absolute;right:-60px;top:-60px;width:220px;height:220px;border-radius:50%;background:var(--accent);opacity:.1;filter:blur(30px)}
.back-box h2{font-size:clamp(1.4rem,2.6vw,1.9rem);line-height:1.2;font-weight:750;max-width:22ch}
.back-box p{color:rgba(255,255,255,.72);font-size:15px;max-width:52ch}
.back-actions{display:flex;flex-wrap:wrap;gap:12px;position:relative;z-index:1}
.btn-onDark{border:1px solid rgba(255,255,255,.32);color:#fff;background:transparent}
.btn-onDark:hover{border-color:var(--accent);color:var(--accent)}
@media (min-width:1024px){.back-box{padding:56px 64px}}

/* ============ 页脚 ============ */
.site-footer{background:var(--ink);color:rgba(255,255,255,.7);margin-top:96px;padding:64px 0 28px;border-radius:32px 32px 0 0}
.footer-grid{display:grid;grid-template-columns:1fr;gap:36px}
@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}}
.site-footer .logo-text b{color:#fff}
.site-footer .logo-text em{color:rgba(255,255,255,.55)}
.footer-desc{font-size:14px;line-height:1.8;color:rgba(255,255,255,.62);margin-top:16px;max-width:34ch}
.socials{display:flex;gap:10px;margin-top:20px}
.socials a{width:38px;height:38px;border-radius:10px;border:1px solid rgba(255,255,255,.22);display:inline-flex;align-items:center;justify-content:center;color:rgba(255,255,255,.8);transition:border-color .2s var(--ease),color .2s var(--ease)}
.socials a:hover{border-color:var(--accent);color:var(--accent)}
.footer-col h3{font-size:14px;font-weight:700;color:#fff;margin-bottom:18px;letter-spacing:.02em}
.footer-col ul{display:flex;flex-direction:column;gap:12px}
.footer-col a{font-size:14px;color:rgba(255,255,255,.7);transition:color .2s var(--ease)}
.footer-col a:hover{color:#fff;text-decoration:underline;text-decoration-color:var(--accent);text-decoration-thickness:2px;text-underline-offset:4px}
.footer-form{display:flex;flex-direction:column;gap:10px;max-width:320px}
.footer-form input{height:46px;border-radius:12px;border:1px solid rgba(255,255,255,.2);background:rgba(255,255,255,.06);color:#fff;padding:0 14px;font-size:14px;transition:border-color .2s var(--ease),box-shadow .2s var(--ease)}
.footer-form input::placeholder{color:rgba(255,255,255,.4)}
.footer-form input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(200,255,61,.18)}
.footer-form .btn{align-self:flex-start}
.footer-bottom{margin-top:48px;padding-top:22px;border-top:1px solid rgba(255,255,255,.12);display:flex;flex-wrap:wrap;gap:14px;align-items:center;justify-content:space-between;font-size:13px;color:rgba(255,255,255,.5)}
.to-top{width:40px;height:40px;border-radius:50%;border:1px solid rgba(255,255,255,.22);display:inline-flex;align-items:center;justify-content:center;color:rgba(255,255,255,.8);transition:border-color .2s var(--ease),color .2s var(--ease),transform .2s var(--ease)}
.to-top:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-2px)}
.toast{position:fixed;left:50%;bottom:32px;transform:translate(-50%,16px);background:var(--ink);color:#fff;font-size:14px;padding:12px 20px;border-radius:999px;box-shadow:var(--shadow-2);opacity:0;visibility:hidden;transition:opacity .3s var(--ease),transform .3s var(--ease);z-index:90}
.toast.is-show{opacity:1;visibility:visible;transform:translate(-50%,0)}

@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;scroll-behavior:auto !important}
  .card:hover{transform:none}
}

/* roulang page: category2 */
:root{
  --ink:#111114;
  --ink-2:#1B1B21;
  --paper:#FAF9F6;
  --paper-2:#F1EEE7;
  --line:#E2DED5;
  --muted:#6C6C74;
  --accent:#C8FF3D;
  --accent-ink:#0B0B0D;
  --accent-2:#6B4EFF;
  --danger:#E5484D;
  --r-card:18px;
  --r-img:16px;
  --r-input:12px;
  --r-block:28px;
  --shadow-1:0 1px 2px rgba(17,17,20,.04),0 8px 24px rgba(17,17,20,.06);
  --shadow-2:0 12px 40px rgba(17,17,20,.12);
  --ease:cubic-bezier(.2,.7,.2,1);
  --font-sans:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular","JetBrains Mono",Consolas,monospace;
  --nav-h:68px;
}
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
  margin:0;
  font-family:var(--font-sans);
  font-size:15px;
  line-height:1.8;
  color:var(--ink);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;transition:color 200ms var(--ease),text-decoration-color 200ms var(--ease);}
a:hover{text-decoration:underline;text-decoration-color:var(--accent);text-decoration-thickness:2px;text-underline-offset:4px;}
button{font-family:inherit;font-size:inherit;cursor:pointer;border:0;background:none;color:inherit;}
h1,h2,h3,h4,p,ul,ol,figure{margin:0;}
ul,ol{padding:0;list-style:none;}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px;}
.mono{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.04em;}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px;}
.section{padding:56px 0;}
.section-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:32px;}
.section-title{font-size:clamp(1.6rem,3.4vw,2.5rem);line-height:1.15;font-weight:750;letter-spacing:-.01em;}
.section-sub{color:var(--muted);font-size:14px;max-width:52ch;margin-top:10px;}

/* ---------- topbar ---------- */
.topbar{background:var(--ink);color:rgba(255,255,255,.72);}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;height:36px;gap:16px;overflow-x:auto;white-space:nowrap;scrollbar-width:none;}
.topbar-inner::-webkit-scrollbar{display:none;}
.topbar-left{display:flex;align-items:center;gap:12px;font-size:12.5px;}
.topbar-domain{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.04em;color:rgba(255,255,255,.85);}
.topbar-sep{width:1px;height:12px;background:rgba(255,255,255,.25);}
.topbar-tip{display:none;}
.topbar-right{display:flex;align-items:center;gap:18px;font-size:12.5px;}
.topbar-right a{color:rgba(255,255,255,.72);}
.topbar-right a:hover{color:#fff;text-decoration-color:var(--accent);}

/* ---------- nav ---------- */
.site-header{position:relative;z-index:60;}
.mainnav{
  position:sticky;top:0;z-index:70;
  background:var(--paper);
  border-bottom:1px solid var(--line);
  transition:height 240ms var(--ease),box-shadow 240ms var(--ease);
}
.mainnav.is-scrolled{box-shadow:var(--shadow-1);}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;height:var(--nav-h);}
.mainnav.is-scrolled .nav-inner{height:56px;}
.logo{display:inline-flex;align-items:center;gap:10px;text-decoration:none;}
.logo:hover{text-decoration:none;}
.logo-mark{width:18px;height:18px;background:var(--accent);clip-path:polygon(0 0,100% 0,100% 72%,72% 100%,0 100%);flex:0 0 auto;}
.logo-text{display:flex;flex-direction:column;line-height:1.15;}
.logo-text b{font-size:16px;font-weight:800;letter-spacing:-.01em;}
.logo-text em{font-size:12px;font-style:normal;color:var(--muted);}
.nav-menu{
  position:fixed;top:0;right:0;bottom:0;width:88vw;max-width:420px;
  display:flex;flex-direction:column;gap:0;
  background:var(--paper);border-left:1px solid var(--line);
  padding:88px 24px 32px;
  transform:translateX(100%);
  transition:transform 320ms var(--ease);
  z-index:80;overflow-y:auto;
}
.nav-menu.open{transform:translateX(0);box-shadow:var(--shadow-2);}
.nav-menu li a{display:block;font-size:20px;line-height:56px;border-bottom:1px solid var(--line);position:relative;}
.nav-menu li a.active{font-weight:700;padding-left:14px;}
.nav-menu li a.active::before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:4px;height:18px;background:var(--accent);border-radius:2px;}
.nav-actions{display:flex;align-items:center;gap:10px;}
.icon-btn{
  width:38px;height:38px;border-radius:999px;border:1px solid var(--line);
  display:inline-flex;align-items:center;justify-content:center;color:var(--ink);
  transition:border-color 200ms var(--ease),background 200ms var(--ease);
}
.icon-btn:hover{border-color:var(--accent);background:var(--paper-2);}
.nav-cta{display:none;}
.hamburger{
  width:40px;height:40px;border-radius:999px;border:1px solid var(--line);
  display:inline-flex;align-items:center;justify-content:center;
}
.hamburger span{position:relative;display:block;width:16px;height:2px;background:var(--ink);border-radius:2px;transition:background 200ms var(--ease);}
.hamburger span::before,.hamburger span::after{content:"";position:absolute;left:0;width:16px;height:2px;background:var(--ink);border-radius:2px;transition:transform 240ms var(--ease),top 240ms var(--ease);}
.hamburger span::before{top:-5px;}
.hamburger span::after{top:5px;}
.hamburger.is-open span{background:transparent;}
.hamburger.is-open span::before{top:0;transform:rotate(45deg);}
.hamburger.is-open span::after{top:0;transform:rotate(-45deg);}

/* ---------- buttons / badges ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 22px;border-radius:999px;
  font-size:15px;font-weight:650;white-space:nowrap;
  transition:background 200ms var(--ease),color 200ms var(--ease),border-color 200ms var(--ease),transform 200ms var(--ease);
}
.btn:hover{text-decoration:none;}
.btn:active{transform:translateY(1px);}
.btn-sm{height:38px;padding:0 18px;font-size:14px;}
.btn-primary{background:var(--accent);color:var(--accent-ink);}
.btn-primary:hover{background:var(--ink);color:var(--accent);}
.btn-outline{border:1px solid var(--line);color:var(--ink);background:transparent;}
.btn-outline:hover{border-color:var(--accent);background:var(--paper-2);}
.btn-white-outline{border:1px solid rgba(255,255,255,.4);color:#fff;background:transparent;}
.btn-white-outline:hover{border-color:var(--accent);color:var(--accent);background:rgba(255,255,255,.06);}
.link-arrow{display:inline-flex;align-items:center;gap:6px;font-weight:600;font-size:14px;}
.link-arrow svg{transition:transform 200ms var(--ease);}
.link-arrow:hover svg{transform:translateX(4px);}
.badge{
  display:inline-block;font-size:11.5px;letter-spacing:.06em;font-weight:650;
  padding:4px 10px;border-radius:6px;border:1px solid var(--line);
  color:var(--muted);background:transparent;
}
.badge-accent{border-color:var(--accent);color:var(--ink);background:rgba(200,255,61,.35);}
.badge-purple{border-color:rgba(107,78,255,.5);color:var(--accent-2);}
.badge-ink{border-color:var(--ink);color:var(--ink);background:var(--paper-2);}

/* ---------- page head ---------- */
.page-head{
  padding:32px 0 40px;
  border-bottom:1px solid var(--line);
  background:
    linear-gradient(180deg,rgba(200,255,61,.06),rgba(250,249,246,0) 70%),
    var(--paper);
}
.crumb{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--muted);white-space:nowrap;overflow-x:auto;scrollbar-width:none;}
.crumb::-webkit-scrollbar{display:none;}
.crumb a:hover{color:var(--ink);}
.crumb .sep{color:var(--line);}
.crumb .current{color:var(--ink);font-weight:600;}
.page-head h1{
  font-size:clamp(2.2rem,6.2vw,3.4rem);
  line-height:1.08;letter-spacing:-.02em;font-weight:800;
  margin:18px 0 14px;max-width:20ch;
}
.page-head p{color:var(--muted);max-width:60ch;font-size:15px;}
.head-facts{display:flex;flex-wrap:wrap;gap:24px;margin-top:22px;}
.head-fact{display:flex;flex-direction:column;gap:2px;}
.head-fact b{font-family:var(--font-mono);font-size:20px;letter-spacing:-.01em;}
.head-fact span{font-size:13px;color:var(--muted);}

/* ---------- split layout ---------- */
.split{display:grid;gap:28px;}
.side-nav{position:relative;}
.side-nav-title{font-size:13px;color:var(--muted);letter-spacing:.06em;margin-bottom:10px;}
.side-list{display:flex;gap:10px;overflow-x:auto;padding-bottom:6px;scrollbar-width:none;}
.side-list::-webkit-scrollbar{display:none;}
.side-list a{
  display:inline-flex;align-items:center;height:40px;padding:0 16px;white-space:nowrap;
  border:1px solid var(--line);border-radius:999px;font-size:14px;color:var(--ink);
  background:var(--paper);transition:background 200ms var(--ease),border-color 200ms var(--ease);
}
.side-list a:hover{background:var(--paper-2);border-color:var(--accent);text-decoration:none;}
.side-list a.active{background:var(--ink);color:#fff;border-color:var(--ink);}
.side-list a.active::before{content:"";width:4px;height:16px;background:var(--accent);margin-right:8px;border-radius:2px;}
.side-links{margin-top:24px;padding-top:20px;border-top:1px solid var(--line);display:none;}
.side-links a{display:block;font-size:14px;padding:9px 0;color:var(--muted);}
.side-links a:hover{color:var(--ink);}

/* ---------- cards ---------- */
.flow-head{margin-bottom:22px;}
.flow-head h2{font-size:clamp(1.6rem,3.4vw,2.2rem);line-height:1.15;font-weight:750;}
.flow-head p{color:var(--muted);font-size:14px;margin-top:8px;max-width:56ch;}
.flow-grid{display:grid;gap:20px;}
.card{
  background:var(--paper);border:1px solid var(--line);border-radius:var(--r-card);
  overflow:hidden;box-shadow:var(--shadow-1);
  transition:transform 320ms var(--ease),box-shadow 320ms var(--ease),border-color 320ms var(--ease);
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-2);border-color:rgba(200,255,61,.6);}
.card-media{position:relative;overflow:hidden;aspect-ratio:16/10;background:var(--paper-2);}
.card-media img{width:100%;height:100%;object-fit:cover;transition:transform 600ms var(--ease);}
.card:hover .card-media img{transform:scale(1.04);}
.card-body{padding:20px;}
.card-title{font-size:17px;font-weight:650;line-height:1.35;margin-bottom:10px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.card-text{color:var(--muted);font-size:14px;line-height:1.75;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.card-foot{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:16px;padding-top:14px;border-top:1px solid var(--line);}
.card-foot .time{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.04em;color:var(--muted);}
.card-lg{display:grid;}
.card-lg .card-media{aspect-ratio:16/9;}
.card-lg .card-body{padding:24px;}
.card-lg .card-title{font-size:22px;-webkit-line-clamp:2;}
.card-lg .card-text{-webkit-line-clamp:3;font-size:14.5px;}
.card-tags{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px;}

/* ---------- timeline ---------- */
.timeline{display:grid;gap:22px;margin-top:8px;}
.tl-item{position:relative;padding-top:22px;border-top:2px solid var(--line);}
.tl-item::after{content:"";position:absolute;top:-2px;left:0;width:44px;height:2px;background:var(--accent);}
.tl-num{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.04em;color:var(--muted);}
.tl-title{font-size:16px;font-weight:650;margin:6px 0 8px;}
.tl-desc{font-size:13.5px;color:var(--muted);line-height:1.7;}
.tl-band{background:var(--paper-2);border-radius:var(--r-block);padding:36px 24px;}
.tl-band h2{font-size:clamp(1.6rem,3.4vw,2.2rem);font-weight:750;line-height:1.15;}
.tl-band .lead{color:var(--muted);font-size:14px;margin-top:10px;max-width:60ch;}

/* ---------- faq ---------- */
.faq-grid{display:grid;gap:0;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:16px;
  min-height:64px;padding:14px 4px;text-align:left;font-size:16px;font-weight:500;
  transition:background 200ms var(--ease);
}
.faq-q:hover{background:var(--paper-2);}
.faq-item.open .faq-q{font-weight:700;}
.faq-item.open .faq-q::before{content:"";position:absolute;}
.faq-q .chev{flex:0 0 auto;transition:transform 240ms var(--ease);color:var(--muted);}
.faq-item.open .faq-q .chev{transform:rotate(180deg);}
.faq-a{max-height:0;overflow:hidden;transition:max-height 320ms var(--ease);}
.faq-a p{font-size:15px;line-height:1.8;color:var(--muted);padding:0 4px 18px;max-width:72ch;}
.faq-item.open{border-left:3px solid var(--accent);padding-left:12px;}

/* ---------- dark cta ---------- */
.cta-dark{
  position:relative;overflow:hidden;border-radius:var(--r-block);
  background:var(--ink);color:#fff;padding:40px 24px;
}
.cta-dark::before{
  content:"";position:absolute;inset:0;
  background-image:url('/assets/images/backpic/back-1.webp');
  background-size:cover;background-position:center;opacity:.14;
}
.cta-dark::after{
  content:"";position:absolute;width:260px;height:260px;right:-60px;top:-80px;border-radius:50%;
  background:var(--accent);filter:blur(90px);opacity:.12;
}
.cta-inner{position:relative;z-index:1;display:grid;gap:28px;}
.cta-dark h2{font-size:clamp(1.6rem,3.4vw,2.4rem);line-height:1.15;font-weight:750;}
.cta-dark .lead{color:rgba(255,255,255,.7);font-size:14.5px;margin-top:12px;max-width:48ch;}
.check-list{margin-top:22px;display:grid;gap:12px;}
.check-list li{display:flex;align-items:flex-start;gap:10px;font-size:14.5px;color:rgba(255,255,255,.86);}
.check-list svg{flex:0 0 auto;margin-top:4px;color:var(--accent);}
.cta-actions{display:flex;flex-direction:column;gap:12px;}
.cta-note{font-size:13px;color:rgba(255,255,255,.55);}

/* ---------- footer ---------- */
.site-footer{background:var(--ink);color:#fff;margin-top:64px;border-radius:32px 32px 0 0;padding:56px 0 24px;}
.footer-grid{display:grid;gap:36px;}
.footer-brand .logo-text b{color:#fff;}
.footer-brand .logo-text em{color:rgba(255,255,255,.55);}
.footer-desc{color:rgba(255,255,255,.6);font-size:13.5px;margin-top:16px;max-width:34ch;}
.socials{display:flex;gap:10px;margin-top:18px;}
.socials a{
  width:38px;height:38px;border:1px solid rgba(255,255,255,.22);border-radius:10px;
  display:inline-flex;align-items:center;justify-content:center;color:rgba(255,255,255,.75);
  transition:border-color 200ms var(--ease),color 200ms var(--ease);
}
.socials a:hover{border-color:var(--accent);color:var(--accent);text-decoration:none;}
.footer-col h3{font-size:14px;font-weight:650;margin-bottom:14px;color:#fff;}
.footer-col ul li{margin-bottom:10px;}
.footer-col ul a{color:rgba(255,255,255,.7);font-size:14px;}
.footer-col ul a:hover{color:#fff;text-decoration-color:var(--accent);}
.footer-form{display:flex;flex-direction:column;gap:10px;max-width:300px;}
.footer-form label{font-size:12.5px;color:rgba(255,255,255,.6);}
.footer-form input{
  height:46px;border-radius:var(--r-input);border:1px solid rgba(255,255,255,.2);
  background:var(--ink-2);color:#fff;padding:0 14px;font-size:14px;font-family:inherit;
  transition:border-color 200ms var(--ease),box-shadow 200ms var(--ease);
}
.footer-form input::placeholder{color:rgba(255,255,255,.38);}
.footer-form input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(200,255,61,.25);}
.footer-bottom{
  margin-top:44px;padding-top:20px;border-top:1px solid rgba(255,255,255,.12);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px;
  font-size:12.5px;color:rgba(255,255,255,.55);
}
.to-top{
  width:40px;height:40px;border-radius:999px;border:1px solid rgba(255,255,255,.22);
  display:inline-flex;align-items:center;justify-content:center;color:rgba(255,255,255,.8);
  transition:background 200ms var(--ease),color 200ms var(--ease),border-color 200ms var(--ease);
}
.to-top:hover{background:var(--accent);color:var(--accent-ink);border-color:var(--accent);text-decoration:none;}

/* ---------- responsive ---------- */
@media (min-width:640px){
  body{font-size:16px;}
  .section{padding:72px 0;}
  .topbar-tip{display:inline;}
  .flow-grid{grid-template-columns:repeat(2,1fr);}
  .card-lg{grid-column:1 / -1;grid-template-columns:1.1fr 1fr;align-items:stretch;}
  .card-lg .card-media{aspect-ratio:auto;height:100%;min-height:280px;}
  .timeline{grid-template-columns:repeat(2,1fr);}
  .faq-grid{grid-template-columns:repeat(2,1fr);column-gap:40px;border-top:0;}
  .faq-grid .faq-item:nth-child(1),.faq-grid .faq-item:nth-child(2){border-top:1px solid var(--line);}
  .cta-dark{padding:56px 40px;}
  .cta-actions{flex-direction:row;}
  .footer-grid{grid-template-columns:repeat(2,1fr);}
}
@media (min-width:1024px){
  .container{padding:0 32px;}
  .section{padding:96px 0;}
  .nav-menu{
    position:static;width:auto;max-width:none;transform:none;flex-direction:row;gap:28px;
    background:transparent;border:0;padding:0;overflow:visible;box-shadow:none;
  }
  .nav-menu li a{font-size:15px;line-height:var(--nav-h);border:0;position:relative;padding:0;}
  .nav-menu li a.active{padding-left:0;font-weight:700;}
  .nav-menu li a.active::before{content:"";position:absolute;left:-12px;top:50%;transform:translateY(-50%);width:4px;height:16px;background:var(--accent);border-radius:2px;}
  .nav-menu li a::after{
    content:"";position:absolute;left:0;bottom:16px;height:2px;width:0;background:var(--accent);
    transition:width 240ms var(--ease);
  }
  .nav-menu li a:hover::after{width:100%;}
  .hamburger{display:none;}
  .nav-cta{display:inline-flex;}
  .split{grid-template-columns:250px 1fr;gap:48px;}
  .side-list{flex-direction:column;overflow:visible;gap:2px;}
  .side-list a{height:44px;border:0;border-radius:0;padding:0 12px;border-bottom:1px solid transparent;justify-content:flex-start;}
  .side-list a:hover{background:var(--paper-2);text-decoration:none;}
  .side-list a.active{background:transparent;color:var(--ink);font-weight:700;border-left:3px solid var(--accent);}
  .side-list a.active::before{display:none;}
  .side-nav.is-sticky{position:sticky;top:calc(var(--nav-h) + 24px);}
  .side-links{display:block;}
  .flow-grid{grid-template-columns:repeat(2,1fr);}
  .timeline{grid-template-columns:repeat(5,1fr);}
  .tl-band{padding:48px 40px;}
  .cta-inner{grid-template-columns:7fr 5fr;align-items:center;gap:48px;}
  .cta-dark{padding:64px;}
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:40px;}
  .page-head{padding:40px 0 56px;}
  .flow-head h2{font-size:clamp(1.6rem,2.6vw,2.2rem);}
}
@media (min-width:1440px){
  .container{max-width:1280px;}
  .section{padding:96px 0;}
  .footer-grid{gap:56px;}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;}
  .card:hover{transform:none;}
  .card:hover .card-media img{transform:none;}
}