/* roulang page: index */
:root{
    --primary: #2B4BE8;
    --primary-dark: #1E3AC4;
    --primary-soft: #EEF2FF;
    --accent: #FF7A45;
    --jade: #10B7A0;
    --ink: #0F1830;
    --text: #46536B;
    --mute: #8A93A8;
    --line: #E4E9F2;
    --surface: #FFFFFF;
    --pagebg: #F5F7FC;
    --radius-card: 18px;
    --radius-btn: 12px;
    --radius-img: 14px;
    --shadow-card: 0 1px 2px rgba(15,24,48,.04), 0 12px 28px -12px rgba(15,24,48,.14);
    --shadow-hover: 0 20px 40px -16px rgba(43,75,232,.28);
    --shadow-nav: 0 8px 24px -16px rgba(15,24,48,.25);
  }
  *{ box-sizing: border-box; }
  html{ scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
  body{
    margin: 0;
    background: var(--pagebg);
    color: var(--text);
    font-family: "PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
    font-size: 16px;
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
  }
  img{ max-width: 100%; display: block; }
  a{ color: inherit; text-decoration: none; }
  button{ font: inherit; cursor: pointer; border: 0; background: none; }
  h1,h2,h3,h4{ color: var(--ink); letter-spacing: -0.01em; margin: 0; font-weight: 700; }
  p{ margin: 0; }
  ul{ margin: 0; padding: 0; list-style: none; }

  .no-scrollbar::-webkit-scrollbar{ display: none; }
  .no-scrollbar{ -ms-overflow-style: none; scrollbar-width: none; }

  .logo-mark{
    width: 40px; height: 40px; border-radius: 12px;
    background: linear-gradient(135deg, #2B4BE8 0%, #1E3AC4 100%);
    color: #fff; display: flex; align-items: center; justify-content: center;
    font-weight: 800; font-size: 15px; letter-spacing: .02em;
    box-shadow: 0 8px 18px -10px rgba(43,75,232,.9);
    flex: none;
  }

  .nav-chip{
    display: inline-flex; align-items: center; gap: 6px;
    padding: 9px 18px; border-radius: 999px;
    font-size: 14px; font-weight: 600; color: var(--text);
    transition: background .25s ease, color .25s ease, box-shadow .25s ease;
    white-space: nowrap;
  }
  .nav-chip:hover{ background: rgba(255,255,255,.75); color: var(--primary); }
  .nav-chip.active{
    background: #fff; color: var(--primary);
    box-shadow: 0 1px 2px rgba(15,24,48,.06), 0 6px 16px -10px rgba(43,75,232,.5);
  }

  .btn-primary{
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 11px 24px; border-radius: var(--radius-btn);
    background: var(--primary); color: #fff;
    font-size: 15px; font-weight: 600;
    box-shadow: 0 10px 22px -12px rgba(43,75,232,.9);
    transition: background .25s ease, transform .25s ease, box-shadow .25s ease;
  }
  .btn-primary:hover{ background: var(--primary-dark); transform: translateY(-2px); box-shadow: var(--shadow-hover); }
  .btn-ghost{
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 11px 24px; border-radius: var(--radius-btn);
    background: #fff; color: var(--ink); border: 1px solid var(--line);
    font-size: 15px; font-weight: 600;
    transition: background .25s ease, border-color .25s ease, color .25s ease, transform .25s ease;
  }
  .btn-ghost:hover{ background: var(--primary-soft); border-color: #C9D5FF; color: var(--primary); transform: translateY(-2px); }
  .btn-accent{
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 11px 24px; border-radius: var(--radius-btn);
    background: var(--accent); color: #fff;
    font-size: 15px; font-weight: 600;
    transition: background .25s ease, transform .25s ease;
  }
  .btn-accent:hover{ background: #F2652C; transform: translateY(-2px); }

  .chip{
    display: inline-flex; align-items: center; gap: 5px;
    padding: 3px 11px; border-radius: 999px;
    font-size: 12px; font-weight: 600;
    background: var(--primary-soft); color: var(--primary);
    white-space: nowrap;
  }
  .chip-jade{ background: rgba(16,183,160,.12); color: #0B8F7C; }
  .chip-accent{ background: rgba(255,122,69,.14); color: #D9541F; }

  .card{
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-card);
    transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
    overflow: hidden;
    display: block;
  }
  .card:hover{ transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: #D4DEFA; }
  .card:hover .card-img{ transform: scale(1.05); }
  .card-img{ transition: transform .5s ease; width: 100%; height: 100%; object-fit: cover; }

  .eyebrow{
    display: inline-flex; align-items: center; gap: 8px;
    font-size: 12px; font-weight: 700; letter-spacing: .08em;
    color: var(--primary); text-transform: uppercase;
  }
  .eyebrow::before{ content: ""; width: 22px; height: 2px; border-radius: 2px; background: var(--primary); }

  .list-row{
    display: flex; align-items: center; gap: 14px;
    padding: 16px 4px; border-bottom: 1px solid var(--line);
    transition: background .25s ease, padding-left .25s ease;
  }
  .list-row:last-child{ border-bottom: 0; }
  .list-row:hover{ background: #FAFBFF; padding-left: 10px; }
  .num-badge{
    flex: none; width: 34px; height: 34px; border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    font-size: 13px; font-weight: 800; color: var(--primary);
    background: var(--primary-soft);
  }

  .img-placeholder{
    background: linear-gradient(135deg, #E8EDFF 0%, #DDE5FF 100%);
  }

  details{ border: 1px solid var(--line); border-radius: 16px; background: #fff; overflow: hidden; transition: box-shadow .25s ease, border-color .25s ease; }
  details[open]{ border-color: #CFDAFB; box-shadow: var(--shadow-card); }
  details summary{ list-style: none; cursor: pointer; padding: 18px 20px; display: flex; align-items: center; justify-content: space-between; gap: 16px; font-size: 15.5px; font-weight: 600; color: var(--ink); }
  details summary::-webkit-details-marker{ display: none; }
  details summary:hover{ color: var(--primary); }
  .faq-icon{
    flex: none; width: 26px; height: 26px; border-radius: 999px;
    border: 1px solid var(--line); display: flex; align-items: center; justify-content: center;
    color: var(--primary); font-size: 17px; line-height: 1; font-weight: 500;
    transition: transform .28s ease, background .28s ease;
  }
  details[open] .faq-icon{ transform: rotate(45deg); background: var(--primary-soft); }
  .faq-answer{
    padding: 0 20px 20px 20px; margin-left: 0;
    font-size: 15px; line-height: 1.85; color: var(--text);
    border-left: 3px solid var(--primary);
    border-radius: 0;
    margin-left: 20px; padding-left: 16px;
  }

  .tab-btn{
    padding: 9px 20px; border-radius: 999px; font-size: 14px; font-weight: 600;
    background: #fff; color: var(--text); border: 1px solid var(--line);
    transition: all .25s ease; white-space: nowrap;
  }
  .tab-btn:hover{ color: var(--primary); border-color: #C9D5FF; }
  .tab-btn.active{ background: var(--primary); color: #fff; border-color: var(--primary); }

  .arrow-btn{
    width: 38px; height: 38px; border-radius: 999px; border: 1px solid var(--line);
    background: #fff; color: var(--ink); display: flex; align-items: center; justify-content: center;
    transition: all .25s ease; flex: none; font-size: 15px;
  }
  .arrow-btn:hover{ background: var(--primary); color: #fff; border-color: var(--primary); }

  .metric-strip{
    display: grid; grid-template-columns: repeat(4, minmax(0,1fr));
    gap: 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
  }
  .metric-item{ padding: 26px 18px; text-align: center; border-right: 1px solid var(--line); }
  .metric-item:last-child{ border-right: 0; }

  .footer-link{ font-size: 14px; color: #9AA6C0; transition: color .22s ease; }
  .footer-link:hover{ color: #fff; }

  .line-clamp-2{
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
  }

  :focus-visible{ outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 6px; }

  @media (max-width: 767px){
    .metric-strip{ grid-template-columns: repeat(2, minmax(0,1fr)); }
    .metric-item{ border-bottom: 1px solid var(--line); }
    .metric-item:nth-child(2n){ border-right: 0; }
    .metric-item:nth-last-child(-n+2){ border-bottom: 0; }
  }
  @media (prefers-reduced-motion: reduce){
    *{ transition: none !important; animation: none !important; scroll-behavior: auto !important; }
    .card:hover{ transform: none; }
  }

/* roulang page: category1 */
:root{
    --primary-600:#2B4BE8;
    --primary-700:#1E3AC4;
    --primary-50:#EEF2FF;
    --accent-500:#FF7A45;
    --teal-500:#10B7A0;
    --ink:#0F1830;
    --body:#46536B;
    --muted:#8A93A8;
    --line:#E4E9F2;
    --surface:#FFFFFF;
    --page:#F5F7FC;
    --radius-card:18px;
    --radius-btn:12px;
    --radius-img:14px;
  }
  *,*::before,*::after{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{
    margin:0;
    font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
    font-size:16px;
    line-height:1.75;
    color:var(--body);
    background:var(--page);
    -webkit-font-smoothing:antialiased;
  }
  h1,h2,h3,h4{margin:0;color:var(--ink);font-weight:800;letter-spacing:-0.01em;line-height:1.3;}
  p{margin:0;}
  a{text-decoration:none;color:inherit;}
  img{max-width:100%;display:block;}
  button{font-family:inherit;}
  ul{margin:0;padding:0;list-style:none;}

  a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible{
    outline:2px solid var(--primary-600);
    outline-offset:2px;
    border-radius:8px;
  }

  /* 隐藏横滑轨道滚动条 */
  .no-bar{scrollbar-width:none;-ms-overflow-style:none;}
  .no-bar::-webkit-scrollbar{display:none;}

  /* 顶部导航 */
  .site-header{
    position:sticky;top:0;z-index:60;
    background:rgba(255,255,255,.82);
    backdrop-filter:blur(14px);
    border-bottom:1px solid transparent;
    transition:background .3s ease, box-shadow .3s ease, border-color .3s ease;
  }
  .site-header.is-scrolled{
    background:#fff;
    border-bottom-color:var(--line);
    box-shadow:0 8px 24px -16px rgba(15,24,48,.25);
  }
  .logo-mark{
    display:inline-flex;align-items:center;justify-content:center;
    width:38px;height:38px;border-radius:11px;
    background:linear-gradient(135deg,#2B4BE8,#5B78FF);
    color:#fff;font-size:13px;font-weight:800;letter-spacing:.02em;
    box-shadow:0 8px 18px -8px rgba(43,75,232,.7);
    flex:0 0 auto;
  }
  .nav-chip{
    display:inline-flex;align-items:center;height:38px;padding:0 18px;
    border-radius:999px;font-size:14px;font-weight:600;color:var(--body);
    white-space:nowrap;transition:background .2s ease,color .2s ease,box-shadow .2s ease;
  }
  .nav-chip:hover{background:#fff;color:var(--primary-600);}
  .nav-chip.active{
    background:#fff;color:var(--primary-600);
    box-shadow:0 1px 2px rgba(15,24,48,.06),0 8px 18px -10px rgba(43,75,232,.5);
  }
  .nav-chip.active:hover{color:var(--primary-700);}

  .btn{
    display:inline-flex;align-items:center;justify-content:center;gap:8px;
    height:46px;padding:0 22px;border-radius:var(--radius-btn);
    font-size:15px;font-weight:700;border:1px solid transparent;
    cursor:pointer;transition:transform .25s ease,background .25s ease,color .25s ease,border-color .25s ease,box-shadow .25s ease;
    white-space:nowrap;
  }
  .btn-primary{background:var(--primary-600);color:#fff;box-shadow:0 12px 26px -14px rgba(43,75,232,.75);}
  .btn-primary:hover{background:var(--primary-700);transform:translateY(-2px);}
  .btn-accent{background:var(--accent-500);color:#fff;box-shadow:0 12px 26px -14px rgba(255,122,69,.85);}
  .btn-accent:hover{background:#F2652C;transform:translateY(-2px);}
  .btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.55);}
  .btn-ghost:hover{background:rgba(255,255,255,.14);border-color:#fff;transform:translateY(-2px);}
  .btn-outline{background:#fff;color:var(--ink);border-color:var(--line);}
  .btn-outline:hover{background:var(--primary-50);border-color:#CBD5FF;color:var(--primary-700);}
  .btn-sm{height:40px;padding:0 16px;font-size:14px;border-radius:999px;}

  .eyebrow{
    display:inline-flex;align-items:center;gap:8px;
    font-size:12px;font-weight:700;letter-spacing:.08em;
    color:var(--primary-600);
  }
  .eyebrow::before{
    content:"";width:6px;height:6px;border-radius:999px;background:var(--accent-500);display:inline-block;
  }
  .chip{
    display:inline-flex;align-items:center;gap:6px;
    height:28px;padding:0 12px;border-radius:999px;
    font-size:12.5px;font-weight:600;
    background:var(--primary-50);color:var(--primary-600);
  }
  .chip-teal{background:rgba(16,183,160,.12);color:#0E9C89;}
  .chip-outline{background:#fff;border:1px solid var(--line);color:var(--body);}

  .card{
    background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);
    box-shadow:0 1px 2px rgba(15,24,48,.04),0 12px 28px -12px rgba(15,24,48,.14);
    transition:transform .3s ease,box-shadow .3s ease,border-color .3s ease;
  }
  .card-hover:hover{transform:translateY(-4px);box-shadow:0 20px 40px -16px rgba(43,75,232,.28);border-color:#D5DEFF;}
  .card-media{
    border-radius:var(--radius-img);overflow:hidden;background:#EEF2FF;position:relative;
  }
  .card-media img{width:100%;height:100%;object-fit:cover;transition:transform .35s ease;}
  .card-hover:hover .card-media img{transform:scale(1.05);}

  /* 页头横幅 */
  .page-hero{position:relative;overflow:hidden;background:#0F1830;}
  .page-hero img.hero-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;}
  .hero-mask{
    position:absolute;inset:0;
    background:linear-gradient(100deg,rgba(8,15,36,.94) 0%,rgba(10,19,44,.86) 42%,rgba(15,24,48,.55) 100%);
  }
  .hero-grid{
    position:absolute;inset:0;opacity:.16;
    background-image:linear-gradient(rgba(255,255,255,.35) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.35) 1px,transparent 1px);
    background-size:56px 56px;
    mask-image:linear-gradient(to right,rgba(0,0,0,.9),transparent 78%);
    -webkit-mask-image:linear-gradient(to right,rgba(0,0,0,.9),transparent 78%);
  }
  .anchor-chip{
    display:inline-flex;align-items:center;height:36px;padding:0 16px;border-radius:999px;
    font-size:13.5px;font-weight:600;color:#E6ECFF;
    background:rgba(255,255,255,.10);border:1px solid rgba(255,255,255,.22);
    transition:background .2s ease,border-color .2s ease,transform .2s ease;
  }
  .anchor-chip:hover{background:rgba(255,255,255,.2);border-color:rgba(255,255,255,.5);transform:translateY(-2px);}
  .crumb{font-size:13px;color:#9FB0D8;}
  .crumb a:hover{color:#fff;}

  /* 对照表 */
  .cmp-table{width:100%;border-collapse:separate;border-spacing:0;font-size:14.5px;}
  .cmp-table th,.cmp-table td{padding:16px 18px;text-align:left;border-bottom:1px solid var(--line);}
  .cmp-table thead th{
    font-size:13px;font-weight:800;color:var(--ink);letter-spacing:.02em;
    background:#F7F9FF;border-bottom:1px solid #DDE4FF;
  }
  .cmp-table tbody tr:nth-child(even){background:#FAFBFF;}
  .cmp-table tbody tr:hover{background:var(--primary-50);}
  .cmp-table tbody td:first-child{font-weight:700;color:var(--ink);width:22%;}
  .cmp-table tbody tr:last-child td{border-bottom:0;}

  /* 时间轴 */
  .step-line{position:relative;}
  .step-line::before{
    content:"";position:absolute;top:22px;left:6%;right:6%;height:2px;
    background:linear-gradient(90deg,#DDE4FF,#C9D5FF,#DDE4FF);
  }
  .step-dot{
    position:relative;z-index:2;
    display:inline-flex;align-items:center;justify-content:center;
    width:44px;height:44px;border-radius:999px;background:#fff;
    border:2px solid var(--primary-600);color:var(--primary-600);
    font-size:15px;font-weight:800;
  }
  .step-current .step-dot{background:var(--primary-600);color:#fff;}

  /* 列表项 */
  .tick-li{display:flex;gap:12px;align-items:flex-start;font-size:15px;line-height:1.85;}
  .tick-li::before{
    content:"";flex:0 0 auto;width:7px;height:7px;border-radius:999px;
    background:var(--primary-600);margin-top:11px;
  }
  .issue-li{
    display:flex;gap:14px;align-items:flex-start;
    padding:18px 4px;border-bottom:1px solid var(--line);
  }
  .issue-li:last-child{border-bottom:0;}
  .issue-no{
    flex:0 0 auto;width:32px;height:32px;border-radius:10px;
    display:inline-flex;align-items:center;justify-content:center;
    background:var(--primary-50);color:var(--primary-600);
    font-size:13px;font-weight:800;
  }

  /* FAQ */
  details.faq{
    background:#fff;border:1px solid var(--line);border-radius:16px;
    padding:0 20px;margin-bottom:12px;transition:border-color .25s ease,box-shadow .25s ease;
  }
  details.faq[open]{border-color:#CBD5FF;box-shadow:0 12px 28px -18px rgba(43,75,232,.4);}
  details.faq summary{
    list-style:none;cursor:pointer;
    display:flex;align-items:center;justify-content:space-between;gap:16px;
    padding:18px 0;font-size:15.5px;font-weight:700;color:var(--ink);
  }
  details.faq summary::-webkit-details-marker{display:none;}
  details.faq summary::after{
    content:"+";flex:0 0 auto;font-size:20px;font-weight:600;color:var(--primary-600);
    transition:transform .25s ease;line-height:1;
  }
  details.faq[open] summary::after{content:"×";transform:rotate(0deg);}
  details.faq .faq-body{
    padding:0 0 20px 16px;border-left:3px solid var(--primary-600);
    font-size:15px;line-height:1.85;color:var(--body);
  }

  /* 表单 */
  .field{
    width:100%;height:48px;padding:0 16px;border-radius:var(--radius-btn);
    border:1px solid var(--line);background:#fff;color:var(--ink);
    font-size:15px;font-family:inherit;transition:border-color .2s ease,box-shadow .2s ease;
  }
  .field::placeholder{color:#A8B1C4;}
  .field:focus{outline:none;border-color:var(--primary-600);box-shadow:0 0 0 4px rgba(43,75,232,.12);}
  .field-hint{font-size:13px;color:var(--muted);}

  .footer-link{font-size:14px;color:#9AA6C0;transition:color .2s ease;}
  .footer-link:hover{color:#fff;}

  @media (max-width:1023px){
    .step-line::before{display:none;}
  }
  @media (prefers-reduced-motion:reduce){
    *{animation:none !important;transition:none !important;}
    html{scroll-behavior:auto;}
    .card-hover:hover{transform:none;}
    .card-hover:hover .card-media img{transform:none;}
    .btn:hover{transform:none;}
  }

/* roulang page: article */
:root{
    --primary-600:#2B4BE8;
    --primary-700:#1E3AC4;
    --primary-50:#EEF2FF;
    --accent-500:#FF7A45;
    --teal-500:#10B7A0;
    --ink:#0F1830;
    --sub:#46536B;
    --muted:#8A93A8;
    --line:#E4E9F2;
    --page:#F5F7FC;
    --surface:#FFFFFF;
    --radius-card:18px;
    --radius-btn:12px;
    --radius-img:14px;
    --shadow-card:0 1px 2px rgba(15,24,48,.04), 0 12px 28px -12px rgba(15,24,48,.14);
    --shadow-hover:0 20px 40px -16px rgba(43,75,232,.28);
  }
  *,*::before,*::after{ box-sizing:border-box; }
  html{ -webkit-text-size-adjust:100%; scroll-behavior:smooth; }
  body{
    margin:0;
    font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
    font-size:16px;
    line-height:1.75;
    color:var(--sub);
    background:var(--page);
    -webkit-font-smoothing:antialiased;
  }
  h1,h2,h3,h4{ color:var(--ink); font-weight:800; letter-spacing:-0.01em; margin:0; }
  p{ margin:0; }
  a{ color:inherit; text-decoration:none; }
  img{ display:block; max-width:100%; }
  button{ font-family:inherit; cursor:pointer; border:0; background:none; }
  ul,ol{ margin:0; padding:0; list-style:none; }
  :focus-visible{ outline:2px solid var(--primary-600); outline-offset:2px; border-radius:6px; }

  .logo-mark{
    display:inline-flex; align-items:center; justify-content:center;
    width:34px; height:34px; border-radius:10px; flex:none;
    background:linear-gradient(135deg,#2B4BE8,#1E3AC4);
    color:#fff; font-size:12.5px; font-weight:800; letter-spacing:.02em;
    box-shadow:0 6px 14px -6px rgba(43,75,232,.75);
  }
  .nav-chip{
    display:inline-flex; align-items:center; padding:8px 16px; border-radius:999px;
    font-size:14px; font-weight:600; color:var(--sub); white-space:nowrap;
    transition:background .25s ease, color .25s ease, box-shadow .25s ease;
  }
  .nav-chip:hover{ color:var(--primary-600); background:rgba(255,255,255,.75); }
  .nav-chip.active{ background:#fff; color:var(--primary-600); box-shadow:0 2px 8px rgba(15,24,48,.08); }
  .footer-link{ font-size:14px; color:#9AA6C0; transition:color .2s ease, transform .2s ease; display:inline-block; }
  .footer-link:hover{ color:#fff; transform:translateX(2px); }

  .btn-primary{
    display:inline-flex; align-items:center; justify-content:center; gap:8px;
    padding:11px 22px; border-radius:var(--radius-btn);
    background:var(--primary-600); color:#fff; font-size:14.5px; font-weight:700;
    box-shadow:0 10px 22px -12px rgba(43,75,232,.85);
    transition:background .25s ease, transform .25s ease, box-shadow .25s ease;
  }
  .btn-primary:hover{ background:var(--primary-700); transform:translateY(-2px); box-shadow:0 16px 28px -14px rgba(43,75,232,.95); }
  .btn-accent{
    display:inline-flex; align-items:center; justify-content:center; gap:8px;
    padding:11px 22px; border-radius:var(--radius-btn);
    background:var(--accent-500); color:#fff; font-size:14.5px; font-weight:700;
    box-shadow:0 10px 22px -14px rgba(255,122,69,.9);
    transition:filter .25s ease, transform .25s ease;
  }
  .btn-accent:hover{ filter:brightness(.94); transform:translateY(-2px); }
  .btn-ghost{
    display:inline-flex; align-items:center; justify-content:center; gap:8px;
    padding:11px 22px; border-radius:var(--radius-btn);
    border:1px solid var(--line); background:#fff; color:var(--ink);
    font-size:14.5px; font-weight:700;
    transition:background .25s ease, border-color .25s ease, color .25s ease, transform .25s ease;
  }
  .btn-ghost:hover{ background:var(--primary-50); border-color:#C9D4FF; color:var(--primary-700); transform:translateY(-2px); }

  .chip{
    display:inline-flex; align-items:center; gap:6px;
    padding:5px 12px; border-radius:999px; font-size:12.5px; font-weight:600;
    background:var(--primary-50); color:var(--primary-700);
  }
  .chip-teal{ background:rgba(16,183,160,.12); color:#0B8B79; }
  .chip-outline{ background:#fff; border:1px solid var(--line); color:var(--sub); }

  .card{
    background:var(--surface); border:1px solid var(--line);
    border-radius:var(--radius-card); box-shadow:var(--shadow-card);
    transition:transform .3s ease, box-shadow .3s ease, border-color .3s ease;
  }
  .card-link:hover{ transform:translateY(-4px); box-shadow:var(--shadow-hover); border-color:#D5DDFB; }
  .card-link:hover .card-img{ transform:scale(1.05); }
  .card-img{ transition:transform .45s ease; }

  .eyebrow{
    display:inline-flex; align-items:center; gap:8px;
    font-size:12.5px; font-weight:700; color:var(--primary-600); letter-spacing:.06em;
  }
  .eyebrow::before{ content:''; width:18px; height:2px; border-radius:2px; background:var(--primary-600); }

  /* 目录 */
  .toc-link{
    display:block; padding:8px 12px 8px 14px; border-left:2px solid var(--line);
    font-size:13.5px; line-height:1.6; color:var(--muted);
    transition:color .2s ease, border-color .2s ease, background .2s ease;
  }
  .toc-link:hover{ color:var(--primary-700); background:#F8FAFF; }
  .toc-link.active{ color:var(--primary-700); border-left-color:var(--primary-600); background:#F5F8FF; font-weight:700; }

  /* 正文排版 */
  .article-body{ font-size:17px; line-height:1.95; color:var(--sub); }
  .article-body > * + *{ margin-top:20px; }
  .article-body h2{
    position:relative; padding-left:16px; font-size:23px; line-height:1.5;
    font-weight:800; color:var(--ink); margin-top:44px;
  }
  .article-body h2::before{
    content:''; position:absolute; left:0; top:7px; bottom:7px; width:4px;
    border-radius:2px; background:var(--primary-600);
  }
  .article-body h3{ font-size:19px; font-weight:700; color:var(--ink); margin-top:32px; }
  .article-body p{ margin-top:18px; }
  .article-body a{ color:var(--primary-600); text-decoration:underline; text-underline-offset:4px; }
  .article-body strong{ color:var(--ink); }
  .article-body ul{ margin-top:16px; }
  .article-body ul li{ position:relative; padding-left:20px; margin-top:10px; }
  .article-body ul li::before{
    content:''; position:absolute; left:2px; top:12px; width:7px; height:7px;
    border-radius:999px; background:var(--primary-600); opacity:.85;
  }
  .article-body ol{ margin-top:16px; padding-left:22px; list-style:decimal; }
  .article-body ol li{ margin-top:10px; padding-left:4px; }
  .article-body blockquote{
    margin-top:24px; padding:16px 20px; border-left:3px solid var(--primary-600);
    background:var(--primary-50); border-radius:0 12px 12px 0; color:var(--primary-700);
  }
  .article-body img{ margin-top:24px; border-radius:var(--radius-img); height:auto; }
  .article-body figure{ margin-top:24px; }
  .article-body figcaption{ margin-top:8px; text-align:center; font-size:13px; color:var(--muted); }
  .article-body table{
    width:100%; margin-top:24px; font-size:15px; border-collapse:collapse;
    border:1px solid var(--line); border-radius:12px; overflow:hidden;
  }
  .article-body th{
    background:var(--page); font-weight:700; color:var(--ink); text-align:left;
    padding:12px 14px; border-bottom:1px solid var(--line);
  }
  .article-body td{ padding:12px 14px; border-bottom:1px solid var(--line); }
  .article-body tr:nth-child(even) td{ background:#FAFBFE; }
  .article-body code{
    background:var(--page); padding:2px 6px; border-radius:6px; font-size:15px;
    color:var(--primary-700);
  }

  .no-scrollbar{ -ms-overflow-style:none; scrollbar-width:none; }
  .no-scrollbar::-webkit-scrollbar{ display:none; }

  #siteHeader.scrolled{ box-shadow:var(--shadow-nav); background:#fff; }
  #mobileMenu.open{ display:block; }

  @media (max-width:520px){
    .article-body{ font-size:16px; line-height:1.9; }
    .article-body h2{ font-size:20px; }
  }
  @media (prefers-reduced-motion: reduce){
    *{ transition:none !important; animation:none !important; scroll-behavior:auto !important; }
    .card-link:hover{ transform:none; }
    .card-link:hover .card-img{ transform:none; }
  }

/* roulang page: category2 */
:root {
    --primary-600: #2B4BE8;
    --primary-700: #1E3AC4;
    --primary-50: #EEF2FF;
    --accent-500: #FF7A45;
    --teal-500: #10B7A0;
    --ink: #0F1830;
    --body: #46536B;
    --muted: #8A93A8;
    --line: #E4E9F2;
    --page-bg: #F5F7FC;
    --radius-card: 18px;
    --radius-btn: 12px;
  }

  * { box-sizing: border-box; }

  html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

  body {
    margin: 0;
    font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
    font-size: 16px;
    line-height: 1.75;
    color: var(--body);
    background: var(--page-bg);
    -webkit-font-smoothing: antialiased;
  }

  h1, h2, h3, h4 {
    margin: 0;
    color: var(--ink);
    font-weight: 800;
    letter-spacing: -0.01em;
    line-height: 1.3;
  }

  p { margin: 0; }
  ul { margin: 0; padding: 0; list-style: none; }

  a { color: inherit; text-decoration: none; }

  img { display: block; max-width: 100%; height: auto; }

  button { font-family: inherit; cursor: pointer; border: none; background: none; }

  input, textarea { font-family: inherit; font-size: 15px; }

  :focus-visible {
    outline: none;
    box-shadow: 0 0 0 2px #fff, 0 0 0 4px var(--primary-600);
    border-radius: 10px;
  }

  /* 顶部导航 */
  .site-header {
    position: sticky;
    top: 0;
    z-index: 60;
    background: rgba(255,255,255,.82);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--line);
    transition: box-shadow .3s ease, background .3s ease;
  }
  .site-header.scrolled { background: #fff; box-shadow: 0 8px 24px -16px rgba(15,24,48,.25); }

  .logo-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 12px;
    background: linear-gradient(135deg, #2B4BE8 0%, #4B67F0 100%);
    color: #fff;
    font-size: 14px;
    font-weight: 800;
    letter-spacing: .02em;
    flex-shrink: 0;
  }

  .nav-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: 999px;
    font-size: 14px;
    font-weight: 600;
    color: var(--body);
    white-space: nowrap;
    transition: color .22s ease, background .22s ease, box-shadow .22s ease;
  }
  .nav-chip:hover { color: var(--primary-700); background: #fff; }
  .nav-chip.active {
    background: #fff;
    color: var(--primary-600);
    box-shadow: 0 1px 2px rgba(15,24,48,.06), 0 6px 16px -10px rgba(43,75,232,.5);
  }

  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 22px;
    border-radius: var(--radius-btn);
    font-size: 15px;
    font-weight: 700;
    transition: transform .22s ease, background .22s ease, box-shadow .22s ease, color .22s ease, border-color .22s ease;
    white-space: nowrap;
  }
  .btn-primary { background: var(--primary-600); color: #fff; box-shadow: 0 12px 26px -14px rgba(43,75,232,.7); }
  .btn-primary:hover { background: var(--primary-700); transform: translateY(-2px); box-shadow: 0 18px 34px -14px rgba(43,75,232,.7); }
  .btn-accent { background: var(--accent-500); color: #fff; box-shadow: 0 12px 26px -14px rgba(255,122,69,.75); }
  .btn-accent:hover { background: #F26430; transform: translateY(-2px); }
  .btn-ghost { background: #fff; color: var(--ink); border: 1px solid var(--line); }
  .btn-ghost:hover { background: var(--primary-50); border-color: #C9D4FF; color: var(--primary-700); transform: translateY(-2px); }
  .btn-light { background: #fff; color: var(--primary-700); }
  .btn-light:hover { background: #EEF2FF; transform: translateY(-2px); }
  .btn-outline-light { background: transparent; color: #fff; border: 1px solid rgba(255,255,255,.55); }
  .btn-outline-light:hover { background: rgba(255,255,255,.14); border-color: #fff; transform: translateY(-2px); }

  .icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: 12px;
    border: 1px solid var(--line);
    background: #fff;
    color: var(--ink);
    transition: background .22s ease, border-color .22s ease;
  }
  .icon-btn:hover { background: var(--primary-50); border-color: #C9D4FF; color: var(--primary-700); }

  /* 通用组件 */
  .eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: .16em;
    color: var(--primary-600);
  }
  .eyebrow::before {
    content: "";
    width: 18px;
    height: 2px;
    border-radius: 2px;
    background: var(--primary-600);
  }

  .chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    border-radius: 999px;
    font-size: 12.5px;
    font-weight: 600;
    border: 1px solid var(--line);
    background: #fff;
    color: var(--body);
  }
  .chip-primary { background: var(--primary-50); border-color: #D3DDFF; color: var(--primary-700); }
  .chip-accent { background: #FFF2EC; border-color: #FFD9C7; color: #D9531F; }
  .chip-teal { background: #E7F9F6; border-color: #B9EDE5; color: #0A8C7B; }

  .card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-card);
    box-shadow: 0 1px 2px rgba(15,24,48,.04), 0 12px 28px -12px rgba(15,24,48,.14);
    transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
  }
  .card-hover:hover { transform: translateY(-4px); box-shadow: 0 20px 40px -16px rgba(43,75,232,.28); border-color: #D3DDFF; }

  .status-dot {
    width: 9px;
    height: 9px;
    border-radius: 999px;
    background: var(--teal-500);
    box-shadow: 0 0 0 4px rgba(16,183,160,.16);
    flex-shrink: 0;
  }

  .bullet-item {
    display: flex;
    gap: 12px;
    align-items: flex-start;
  }
  .bullet-dot {
    margin-top: 9px;
    width: 7px;
    height: 7px;
    border-radius: 999px;
    background: var(--primary-600);
    flex-shrink: 0;
  }

  .no-scrollbar { -ms-overflow-style: none; scrollbar-width: none; }
  .no-scrollbar::-webkit-scrollbar { display: none; }

  .lib-track { scroll-snap-type: x mandatory; }

  .footer-link {
    font-size: 14px;
    color: #9AA6C0;
    transition: color .22s ease;
  }
  .footer-link:hover { color: #fff; }

  .quote-block {
    border-left: 5px solid var(--primary-600);
    padding-left: 22px;
  }

  details > summary { list-style: none; }
  details > summary::-webkit-details-marker { display: none; }

  .grid-deco {
    background-image:
      linear-gradient(rgba(43,75,232,.055) 1px, transparent 1px),
      linear-gradient(90deg, rgba(43,75,232,.055) 1px, transparent 1px);
    background-size: 34px 34px;
  }

  .hero-panel {
    background: linear-gradient(180deg, #FFFFFF 0%, #F5F7FC 100%);
  }

  @media (prefers-reduced-motion: reduce) {
    * { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
    .card-hover:hover { transform: none; }
    .btn:hover { transform: none; }
  }