/* roulang page: index */
:root{
      --bg: #f4f7fb;
      --bg-2: #edf3fa;
      --surface: rgba(255,255,255,.82);
      --surface-strong: #ffffff;
      --surface-soft: #f8fbfe;
      --brand: #2e67b7;
      --brand-2: #4a8bd8;
      --brand-3: #dcecff;
      --accent: #2fb7c4;
      --accent-2: #dff7f9;
      --text: #1f2a37;
      --muted: #66758a;
      --line: rgba(55, 84, 126, .14);
      --line-strong: rgba(46,103,183,.18);
      --shadow: 0 18px 60px rgba(36, 58, 92, .10);
      --shadow-2: 0 14px 36px rgba(36, 58, 92, .12);
      --shadow-soft: 0 10px 28px rgba(36, 58, 92, .08);
      --radius-xl: 28px;
      --radius-lg: 22px;
      --radius-md: 18px;
      --radius-sm: 14px;
      --transition: all .24s ease;
      --container: 1280px;
    }
    *, *::before, *::after { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body{
      margin:0;
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Segoe UI", Arial, sans-serif;
      color: var(--text);
      background:
        radial-gradient(1000px 560px at 10% -5%, rgba(46,103,183,.14), transparent 56%),
        radial-gradient(840px 520px at 95% 8%, rgba(47,183,196,.12), transparent 54%),
        linear-gradient(180deg, #f8fbff 0%, #f3f7fc 100%);
      line-height: 1.75;
      overflow-x: hidden;
      padding-bottom: 96px;
    }
    img{ max-width:100%; display:block; }
    a{ color:inherit; text-decoration:none; }
    a:hover{ color: var(--brand); }
    button, input, textarea, select { font: inherit; }
    button:focus, a:focus, input:focus, textarea:focus, select:focus,
    .btn:focus, .form-control:focus, .accordion-button:focus {
      box-shadow: 0 0 0 .22rem rgba(46,103,183,.16);
      outline: none;
    }
    ::selection{ background: rgba(46,103,183,.18); color: var(--text); }

    .site-header{
      position: fixed;
      inset: 0 0 auto 0;
      z-index: 1030;
      transition: var(--transition);
      padding: 14px 0;
      background: linear-gradient(180deg, rgba(245,248,252,.52), rgba(245,248,252,.30));
      border-bottom: 1px solid transparent;
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
    }
    .site-header.is-scrolled{
      background: rgba(255,255,255,.92);
      border-bottom-color: rgba(55,84,126,.10);
      box-shadow: 0 12px 38px rgba(33, 55, 85, .08);
    }
    .site-container{
      max-width: var(--container);
      padding-left: 20px;
      padding-right: 20px;
    }
    .brand-wrap{
      display: inline-flex;
      align-items: center;
      gap: 12px;
      min-width: 0;
      color: var(--text);
      font-weight: 800;
      letter-spacing: .2px;
    }
    .brand-mark{
      width: 42px;
      height: 42px;
      border-radius: 14px;
      display: inline-grid;
      place-items: center;
      color: white;
      background:
        linear-gradient(145deg, var(--brand), #4e89d8);
      box-shadow: 0 12px 26px rgba(46,103,183,.26);
      flex: 0 0 auto;
    }
    .brand-text{
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
      font-size: 1.02rem;
    }
    .navbar .nav-link{
      color: rgba(31,42,55,.80);
      font-weight: 600;
      border-radius: 999px;
      padding: .62rem .95rem;
      transition: var(--transition);
    }
    .navbar .nav-link:hover,
    .navbar .nav-link:focus,
    .navbar .nav-link.active{
      color: var(--brand);
      background: rgba(46,103,183,.10);
    }
    .nav-search{
      min-width: 290px;
    }
    .search-shell{
      display:flex;
      align-items:center;
      gap:10px;
      padding: 8px 10px 8px 14px;
      border-radius: 999px;
      border: 1px solid rgba(55,84,126,.14);
      background: rgba(255,255,255,.86);
      box-shadow: 0 12px 30px rgba(36,58,92,.06);
      transition: var(--transition);
    }
    .search-shell:focus-within{
      border-color: rgba(46,103,183,.32);
      box-shadow: 0 16px 34px rgba(46,103,183,.10);
    }
    .search-shell input{
      border: 0;
      background: transparent;
      width: 100%;
      min-width: 0;
      color: var(--text);
      outline: none;
    }
    .search-shell input::placeholder{ color: #8191a5; }
    .btn-brand,
    .btn-brand-outline,
    .btn-soft{
      border-radius: 999px;
      padding: .82rem 1.18rem;
      font-weight: 700;
      transition: var(--transition);
      border: 1px solid transparent;
    }
    .btn-brand{
      background: linear-gradient(135deg, var(--brand), var(--brand-2));
      color: #fff;
      box-shadow: 0 14px 28px rgba(46,103,183,.20);
    }
    .btn-brand:hover{
      color:#fff;
      transform: translateY(-1px);
      box-shadow: 0 18px 36px rgba(46,103,183,.24);
      filter: brightness(1.02);
    }
    .btn-brand:active{
      transform: translateY(0);
      box-shadow: 0 10px 20px rgba(46,103,183,.18);
    }
    .btn-brand-outline{
      background: rgba(255,255,255,.78);
      color: var(--brand);
      border-color: rgba(46,103,183,.18);
    }
    .btn-brand-outline:hover{
      color: var(--brand);
      background: rgba(46,103,183,.08);
      transform: translateY(-1px);
    }
    .btn-soft{
      background: rgba(47,183,196,.10);
      color: #1f6b74;
      border-color: rgba(47,183,196,.16);
    }
    .btn-soft:hover{
      background: rgba(47,183,196,.16);
      color: #16555d;
      transform: translateY(-1px);
    }
    .chip{
      display:inline-flex;
      align-items:center;
      gap:6px;
      padding: .45rem .8rem;
      border-radius: 999px;
      background: rgba(46,103,183,.08);
      color: var(--brand);
      border: 1px solid rgba(46,103,183,.12);
      font-size: .88rem;
      font-weight: 700;
      letter-spacing: .1px;
    }
    .chip.soft{
      background: rgba(47,183,196,.10);
      color: #1f7180;
      border-color: rgba(47,183,196,.14);
    }
    .hero{
      position: relative;
      padding: 128px 0 56px;
    }
    .hero::before,
    .hero::after{
      content:"";
      position:absolute;
      inset:auto;
      pointer-events:none;
      z-index:0;
      filter: blur(2px);
    }
    .hero::before{
      width: 320px;
      height: 320px;
      border-radius: 50%;
      top: 68px;
      right: -120px;
      background: radial-gradient(circle, rgba(46,103,183,.18), rgba(46,103,183,0) 68%);
    }
    .hero::after{
      width: 220px;
      height: 220px;
      border-radius: 50%;
      left: -90px;
      bottom: -20px;
      background: radial-gradient(circle, rgba(47,183,196,.16), rgba(47,183,196,0) 66%);
    }
    .hero-grid,
    .section-grid{
      position: relative;
      z-index: 1;
    }
    .hero-panel{
      background: linear-gradient(180deg, rgba(255,255,255,.84), rgba(255,255,255,.74));
      border: 1px solid rgba(55,84,126,.12);
      border-radius: 32px;
      box-shadow: var(--shadow);
      overflow: hidden;
    }
    .hero-copy{
      padding: 42px 40px 40px;
    }
    .eyebrow{
      display:inline-flex;
      align-items:center;
      gap:8px;
      color: var(--brand);
      font-weight: 700;
      font-size: .95rem;
      margin-bottom: 16px;
    }
    .hero h1{
      font-size: clamp(2rem, 3.4vw, 4.25rem);
      line-height: 1.12;
      letter-spacing: -.04em;
      color: #173056;
      margin-bottom: 18px;
      font-weight: 900;
    }
    .hero p.lead{
      font-size: 1.06rem;
      color: var(--muted);
      max-width: 42rem;
      margin-bottom: 26px;
    }
    .hero-actions{
      display:flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-bottom: 24px;
    }
    .hero-metrics{
      display:flex;
      flex-wrap: wrap;
      gap: 12px;
    }
    .metric-chip{
      display:flex;
      align-items:center;
      gap:10px;
      padding: .85rem 1rem;
      border-radius: 18px;
      background: rgba(255,255,255,.86);
      border: 1px solid rgba(55,84,126,.10);
      box-shadow: 0 12px 24px rgba(36,58,92,.06);
      min-width: 150px;
    }
    .metric-chip strong{
      display:block;
      font-size: 1.02rem;
      line-height: 1.2;
      color: #173056;
    }
    .metric-chip span{
      display:block;
      font-size: .86rem;
      color: var(--muted);
    }
    .hero-search{
      margin-top: 22px;
      max-width: 620px;
    }
    .hero-search .search-shell{
      padding: 10px 10px 10px 16px;
      background: rgba(255,255,255,.92);
    }
    .hero-search .search-shell input{
      font-size: 1rem;
    }
    .hero-note{
      margin-top: 12px;
      color: #738296;
      font-size: .94rem;
    }
    .hero-visual{
      padding: 26px;
      height: 100%;
      background:
        linear-gradient(145deg, rgba(233,242,252,.92), rgba(255,255,255,.78));
      border-left: 1px solid rgba(55,84,126,.10);
    }
    .visual-grid{
      display:grid;
      grid-template-columns: 1.15fr .85fr;
      gap: 16px;
      height: 100%;
      min-height: 420px;
    }
    .poster-stack{
      display:grid;
      gap: 14px;
      grid-template-rows: 1.15fr .85fr;
    }
    .poster-card,
    .mini-card,
    .data-card,
    .content-card,
    .update-card,
    .scene-card,
    .stat-card,
    .recommend-card,
    .timeline-card{
      position: relative;
      border-radius: var(--radius-lg);
      border: 1px solid rgba(55,84,126,.12);
      background: var(--surface-strong);
      box-shadow: var(--shadow-soft);
      overflow: hidden;
      transition: var(--transition);
    }
    .poster-card:hover,
    .mini-card:hover,
    .content-card:hover,
    .update-card:hover,
    .scene-card:hover,
    .recommend-card:hover,
    .timeline-card:hover{
      transform: translateY(-3px);
      box-shadow: var(--shadow-2);
    }
    .poster-card{
      min-height: 278px;
      padding: 20px;
      background:
        linear-gradient(180deg, rgba(18,35,61,.15), rgba(18,35,61,.62)),
        linear-gradient(135deg, #a7c7f2 0%, #7ca9df 45%, #305d9f 100%);
      color: #fff;
      display:flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .poster-card .poster-tag,
    .mini-card .poster-tag,
    .recommend-card .poster-tag{
      display:inline-flex;
      align-items:center;
      gap:6px;
      width: fit-content;
      padding: .34rem .64rem;
      border-radius: 999px;
      background: rgba(255,255,255,.16);
      backdrop-filter: blur(10px);
      font-size: .82rem;
      font-weight: 700;
      letter-spacing: .2px;
    }
    .poster-card h2,
    .mini-card h3{
      margin: 0;
      font-weight: 900;
      letter-spacing: -.02em;
    }
    .poster-card h2{
      font-size: 1.72rem;
      line-height: 1.15;
      max-width: 11ch;
    }
    .poster-card p,
    .mini-card p{
      margin: 10px 0 0;
      opacity: .9;
      font-size: .94rem;
    }
    .poster-stats{
      display:flex;
      gap:10px;
      flex-wrap: wrap;
    }
    .poster-stat{
      padding: .48rem .72rem;
      border-radius: 999px;
      background: rgba(255,255,255,.14);
      backdrop-filter: blur(10px);
      font-size: .82rem;
      font-weight: 700;
    }
    .poster-cta{
      display:flex;
      justify-content: space-between;
      align-items:center;
      gap: 8px;
      margin-top: 12px;
    }
    .poster-cta .btn{
      padding: .62rem .9rem;
      border-radius: 999px;
      font-size: .92rem;
      font-weight: 700;
    }
    .poster-mini-grid{
      display:grid;
      grid-template-columns: 1fr;
      gap: 14px;
    }
    .mini-card{
      min-height: 126px;
      padding: 18px 18px 16px;
      color: #fff;
      display:flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .mini-card.card-1{ background: linear-gradient(145deg, rgba(47,183,196,.94), rgba(28,144,166,.95)); }
    .mini-card.card-2{ background: linear-gradient(145deg, rgba(60,103,176,.96), rgba(31,72,143,.95)); }
    .mini-card.card-3{ background: linear-gradient(145deg, rgba(111,142,194,.96), rgba(62,102,160,.95)); }
    .mini-card .mini-row{
      display:flex;
      justify-content: space-between;
      align-items:center;
      gap:10px;
      font-size: .88rem;
      font-weight: 700;
      opacity: .94;
    }
    .mini-card h3{
      font-size: 1.12rem;
    }
    .mini-card .mini-badge{
      width: 34px;
      height: 34px;
      border-radius: 12px;
      display:inline-grid;
      place-items:center;
      background: rgba(255,255,255,.18);
      flex: 0 0 auto;
    }

    .section{
      padding: 24px 0 0;
      position: relative;
    }
    .section-shell{
      background: rgba(255,255,255,.70);
      border: 1px solid rgba(55,84,126,.10);
      border-radius: 30px;
      box-shadow: var(--shadow-soft);
      overflow: hidden;
    }
    .section-pad{
      padding: 34px;
    }
    .section-header{
      display:flex;
      justify-content: space-between;
      align-items: end;
      gap: 18px;
      margin-bottom: 22px;
    }
    .section-header h2{
      margin:0;
      font-size: clamp(1.4rem, 2vw, 2.15rem);
      line-height: 1.18;
      font-weight: 900;
      color: #173056;
      letter-spacing: -.03em;
    }
    .section-header p{
      margin: 0;
      color: var(--muted);
      max-width: 52rem;
      font-size: .98rem;
    }
    .section-header .section-tag{
      flex-shrink: 0;
      margin-bottom: 2px;
    }

    .features-grid{
      display:grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 18px;
    }
    .feature-card{
      padding: 24px;
      background: linear-gradient(180deg, rgba(255,255,255,.92), rgba(248,251,254,.94));
      border: 1px solid rgba(55,84,126,.12);
      border-radius: 24px;
      box-shadow: var(--shadow-soft);
      position: relative;
      overflow: hidden;
    }
    .feature-card::after{
      content:"";
      position:absolute;
      inset:auto -24px -40px auto;
      width: 120px;
      height: 120px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(46,103,183,.12), transparent 65%);
    }
    .feature-icon{
      width: 52px;
      height: 52px;
      border-radius: 18px;
      display:inline-grid;
      place-items:center;
      color: var(--brand);
      background: rgba(46,103,183,.10);
      margin-bottom: 16px;
      font-size: 1.08rem;
    }
    .feature-card h3{
      margin: 0 0 10px;
      font-size: 1.12rem;
      font-weight: 800;
      color: #173056;
    }
    .feature-card p{
      margin: 0;
      color: var(--muted);
      font-size: .97rem;
    }

    .scene-grid{
      display:grid;
      grid-template-columns: 1.05fr .95fr;
      gap: 18px;
    }
    .scene-card{
      padding: 24px;
      background: linear-gradient(180deg, rgba(255,255,255,.95), rgba(246,249,253,.96));
    }
    .scene-card .scene-head{
      display:flex;
      justify-content: space-between;
      gap: 12px;
      align-items:center;
      margin-bottom: 18px;
    }
    .scene-card .scene-head h3{
      margin:0;
      font-size: 1.18rem;
      color: #173056;
      font-weight: 800;
    }
    .scene-card .scene-head .small{
      color: var(--muted);
    }
    .scene-list{
      display:grid;
      gap: 12px;
    }
    .scene-item{
      display:flex;
      gap: 14px;
      align-items:flex-start;
      padding: 14px 15px;
      border-radius: 18px;
      background: rgba(46,103,183,.05);
      border: 1px solid rgba(46,103,183,.10);
    }
    .scene-item .scene-dot{
      width: 42px;
      height: 42px;
      border-radius: 14px;
      display:inline-grid;
      place-items:center;
      background: linear-gradient(135deg, rgba(46,103,183,.14), rgba(47,183,196,.10));
      color: var(--brand);
      flex-shrink: 0;
      font-size: 1rem;
    }
    .scene-item h4{
      margin: 0 0 5px;
      font-size: 1rem;
      font-weight: 800;
      color: #173056;
    }
    .scene-item p{
      margin: 0;
      color: var(--muted);
      font-size: .95rem;
    }
    .scene-side{
      display:grid;
      gap: 18px;
    }
    .rank-strip{
      display:flex;
      flex-direction: column;
      gap: 12px;
    }
    .rank-row{
      display:flex;
      align-items:center;
      justify-content: space-between;
      gap: 14px;
      padding: 13px 14px;
      border-radius: 18px;
      background: #fff;
      border: 1px solid rgba(55,84,126,.10);
    }
    .rank-row .left{
      display:flex;
      align-items:center;
      gap: 12px;
      min-width: 0;
    }
    .rank-no{
      width: 34px;
      height: 34px;
      border-radius: 12px;
      display:inline-grid;
      place-items:center;
      background: rgba(46,103,183,.10);
      color: var(--brand);
      font-weight: 800;
      flex-shrink: 0;
    }
    .rank-row h4{
      margin: 0;
      font-size: .98rem;
      font-weight: 800;
      color: #173056;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }
    .rank-row p{
      margin: 2px 0 0;
      color: var(--muted);
      font-size: .86rem;
    }

    .proof-grid{
      display:grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 16px;
    }
    .stat-card{
      padding: 22px 20px;
      background: linear-gradient(180deg, rgba(255,255,255,.95), rgba(247,250,254,.96));
    }
    .stat-card .num{
      font-size: 2rem;
      font-weight: 900;
      color: var(--brand);
      line-height: 1;
      margin-bottom: 8px;
      letter-spacing: -.03em;
    }
    .stat-card .label{
      font-size: .96rem;
      font-weight: 800;
      color: #173056;
      margin-bottom: 6px;
    }
    .stat-card .desc{
      color: var(--muted);
      font-size: .92rem;
      margin: 0;
    }
    .tag-cloud{
      display:flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 18px;
    }
    .tag-cloud .chip{
      background: rgba(255,255,255,.9);
    }

    .recommend-grid{
      display:grid;
      grid-template-columns: 1.05fr .95fr;
      gap: 16px;
    }
    .recommend-card{
      min-height: 100%;
      padding: 22px;
      background: linear-gradient(180deg, rgba(255,255,255,.96), rgba(248,251,253,.96));
    }
    .recommend-main{
      min-height: 340px;
      color: #fff;
      background:
        linear-gradient(180deg, rgba(17,35,61,.10), rgba(17,35,61,.70)),
        linear-gradient(135deg, #8eb6e9 0%, #4c82cb 42%, #214d8c 100%);
      display:flex;
      flex-direction: column;
      justify-content: space-between;
      position: relative;
      overflow: hidden;
    }
    .recommend-main::after{
      content:"";
      position:absolute;
      inset: auto -80px -90px auto;
      width: 220px;
      height: 220px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(255,255,255,.26), transparent 66%);
    }
    .recommend-main .poster-tag{
      background: rgba(255,255,255,.17);
    }
    .recommend-main h3{
      font-size: clamp(1.4rem, 2.2vw, 2.2rem);
      font-weight: 900;
      line-height: 1.12;
      margin: 0;
      max-width: 13ch;
    }
    .recommend-main p{
      margin: 12px 0 0;
      color: rgba(255,255,255,.92);
      max-width: 32rem;
    }
    .recommend-list{
      display:grid;
      gap: 14px;
    }
    .recommend-mini{
      display:flex;
      gap: 14px;
      align-items: stretch;
      padding: 16px;
    }
    .recommend-mini .thumb{
      width: 92px;
      flex-shrink: 0;
      border-radius: 18px;
      background:
        linear-gradient(160deg, rgba(46,103,183,.20), rgba(47,183,196,.12)),
        linear-gradient(145deg, #dfeaf7, #f8fbfe);
      border: 1px solid rgba(46,103,183,.10);
      position: relative;
      overflow: hidden;
    }
    .recommend-mini .thumb::after{
      content:"";
      position:absolute;
      inset: 12px 14px auto auto;
      width: 22px;
      height: 22px;
      border-radius: 50%;
      background: rgba(255,255,255,.55);
    }
    .recommend-mini .body{
      min-width: 0;
      flex: 1;
    }
    .recommend-mini h4{
      margin: 0 0 6px;
      font-size: 1.02rem;
      font-weight: 800;
      color: #173056;
    }
    .recommend-mini p{
      margin: 0 0 12px;
      color: var(--muted);
      font-size: .93rem;
    }
    .recommend-meta{
      display:flex;
      align-items:center;
      justify-content: space-between;
      gap: 10px;
      font-size: .86rem;
      color: var(--muted);
    }

    .timeline-wrap{
      display:grid;
      gap: 14px;
    }
    .timeline-card{
      padding: 18px 18px 18px 20px;
      background: linear-gradient(180deg, rgba(255,255,255,.96), rgba(246,249,253,.96));
      display:flex;
      gap: 16px;
      align-items:flex-start;
    }
    .timeline-badge{
      width: 52px;
      height: 52px;
      border-radius: 18px;
      display:inline-grid;
      place-items:center;
      background: rgba(46,103,183,.10);
      color: var(--brand);
      flex-shrink: 0;
      font-weight: 900;
      box-shadow: inset 0 0 0 1px rgba(46,103,183,.08);
    }
    .timeline-card h4{
      margin: 0 0 6px;
      font-size: 1.05rem;
      font-weight: 800;
      color: #173056;
    }
    .timeline-card p{
      margin: 0;
      color: var(--muted);
      font-size: .95rem;
    }

    .latest-layout{
      display:grid;
      grid-template-columns: minmax(0, 1.5fr) minmax(320px, .72fr);
      gap: 18px;
    }
    .latest-grid{
      display:grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 16px;
    }
    .content-card{
      display:flex;
      flex-direction: column;
      padding: 20px;
      min-height: 100%;
      background: linear-gradient(180deg, rgba(255,255,255,.98), rgba(247,250,253,.96));
    }
    .content-card .meta{
      display:flex;
      justify-content: space-between;
      gap: 12px;
      align-items:center;
      margin-bottom: 12px;
      flex-wrap: wrap;
    }
    .badge-soft{
      display:inline-flex;
      align-items:center;
      gap:6px;
      padding: .36rem .66rem;
      border-radius: 999px;
      background: rgba(46,103,183,.08);
      color: var(--brand);
      border: 1px solid rgba(46,103,183,.10);
      font-size: .82rem;
      font-weight: 700;
    }
    .content-card h3{
      font-size: 1.06rem;
      line-height: 1.5;
      margin: 0 0 10px;
      color: #173056;
      font-weight: 800;
    }
    .content-card p{
      color: var(--muted);
      font-size: .94rem;
      margin: 0 0 16px;
      display: -webkit-box;
      -webkit-line-clamp: 3;
      -webkit-box-orient: vertical;
      overflow: hidden;
      min-height: 4.5em;
    }
    .content-card .link-row{
      margin-top: auto;
      display:flex;
      align-items:center;
      justify-content: space-between;
      gap: 10px;
      color: var(--brand);
      font-weight: 800;
      padding-top: 14px;
      border-top: 1px solid rgba(55,84,126,.10);
    }
    .content-card .link-row i{ transition: var(--transition); }
    .content-card:hover .link-row i{ transform: translateX(3px); }
    .sidebar-card{
      padding: 22px;
      background: linear-gradient(180deg, rgba(255,255,255,.96), rgba(247,250,253,.97));
    }
    .sidebar-card + .sidebar-card{ margin-top: 16px; }
    .sidebar-card h3{
      margin: 0 0 12px;
      font-size: 1.08rem;
      font-weight: 800;
      color: #173056;
    }
    .side-list{
      list-style: none;
      margin: 0;
      padding: 0;
      display: grid;
      gap: 10px;
    }
    .side-list li{
      display:flex;
      align-items:flex-start;
      gap: 10px;
      color: var(--muted);
      font-size: .94rem;
    }
    .side-list li i{
      color: var(--brand);
      margin-top: .2rem;
      flex-shrink: 0;
    }
    .empty-state{
      padding: 28px 22px;
      border-radius: 24px;
      background: linear-gradient(180deg, rgba(255,255,255,.98), rgba(247,250,253,.96));
      border: 1px dashed rgba(46,103,183,.22);
      color: #5f7088;
      min-height: 180px;
      display:grid;
      place-items:center;
      text-align:center;
    }

    .faq-shell .accordion-item{
      border: 1px solid rgba(55,84,126,.12);
      border-radius: 18px;
      overflow: hidden;
      background: #fff;
      box-shadow: var(--shadow-soft);
      margin-bottom: 14px;
    }
    .faq-shell .accordion-button{
      font-weight: 800;
      color: #173056;
      background: #fff;
      padding: 18px 20px;
      box-shadow: none;
    }
    .faq-shell .accordion-button:not(.collapsed){
      background: rgba(46,103,183,.06);
      color: var(--brand);
    }
    .faq-shell .accordion-button::after{
      width: 1rem;
      height: 1rem;
      background-size: 1rem;
    }
    .faq-shell .accordion-body{
      color: var(--muted);
      padding: 0 20px 18px;
    }

    .sticky-cta{
      position: fixed;
      inset: auto 0 0 0;
      z-index: 1025;
      padding: 12px 0;
      background: rgba(255,255,255,.88);
      border-top: 1px solid rgba(55,84,126,.12);
      box-shadow: 0 -12px 34px rgba(34, 57, 89, .08);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
    }
    .sticky-cta .bar{
      display:flex;
      align-items:center;
      justify-content: space-between;
      gap: 16px;
    }
    .sticky-cta .text{
      min-width: 0;
    }
    .sticky-cta .text strong{
      display:block;
      font-size: 1rem;
      color: #173056;
      margin-bottom: 2px;
    }
    .sticky-cta .text span{
      display:block;
      color: var(--muted);
      font-size: .92rem;
    }
    .sticky-cta .actions{
      display:flex;
      gap: 10px;
      flex-wrap: wrap;
    }
    .sticky-cta .actions .btn{
      padding: .82rem 1.1rem;
    }

    .footer{
      padding: 28px 0 36px;
      color: #5f7088;
    }
    .footer-shell{
      padding: 24px 26px;
      border-radius: 28px;
      background: rgba(255,255,255,.74);
      border: 1px solid rgba(55,84,126,.10);
      box-shadow: var(--shadow-soft);
    }
    .footer-top{
      display:flex;
      justify-content: space-between;
      gap: 18px;
      align-items:flex-start;
      flex-wrap: wrap;
      margin-bottom: 18px;
    }
    .footer-brand{
      display:flex;
      align-items:center;
      gap: 12px;
      color: #173056;
      font-weight: 900;
      font-size: 1.05rem;
    }
    .footer-links{
      display:flex;
      flex-wrap: wrap;
      gap: 10px 16px;
    }
    .footer-links a{
      color: #58708a;
      font-weight: 600;
      padding: .2rem 0;
    }
    .footer-links a:hover{
      color: var(--brand);
    }
    .footer-note{
      display:flex;
      justify-content: space-between;
      gap: 16px;
      flex-wrap: wrap;
      padding-top: 16px;
      border-top: 1px solid rgba(55,84,126,.10);
      font-size: .92rem;
    }

    .scroll-top{
      position: fixed;
      right: 18px;
      bottom: 112px;
      z-index: 1024;
      width: 46px;
      height: 46px;
      border: 0;
      border-radius: 50%;
      display:grid;
      place-items:center;
      color: #fff;
      background: linear-gradient(135deg, var(--brand), var(--brand-2));
      box-shadow: 0 16px 34px rgba(46,103,183,.24);
      opacity: 0;
      visibility: hidden;
      transform: translateY(8px);
      transition: var(--transition);
    }
    .scroll-top.show{
      opacity: 1;
      visibility: visible;
      transform: translateY(0);
    }

    .text-muted-2{ color: var(--muted) !important; }
    .glass{
      background: rgba(255,255,255,.74);
      border: 1px solid rgba(55,84,126,.10);
      box-shadow: var(--shadow-soft);
      border-radius: 24px;
    }

    @media (max-width: 1199.98px){
      .visual-grid{ min-height: 390px; }
      .hero-copy{ padding: 36px 30px 32px; }
      .hero-visual{ padding: 22px; }
      .latest-layout,
      .recommend-grid,
      .scene-grid{
        grid-template-columns: 1fr;
      }
      .latest-grid{
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 991.98px){
      .site-header{
        padding: 10px 0;
      }
      .navbar-collapse{
        margin-top: 12px;
        padding: 14px;
        background: rgba(255,255,255,.94);
        border-radius: 22px;
        border: 1px solid rgba(55,84,126,.10);
        box-shadow: var(--shadow-soft);
      }
      .nav-search{
        min-width: 100%;
      }
      .hero{
        padding-top: 116px;
      }
      .hero-grid,
      .proof-grid,
      .features-grid{
        grid-template-columns: 1fr 1fr;
      }
      .visual-grid{
        grid-template-columns: 1fr;
      }
      .poster-card h2{ max-width: none; }
      .recommend-main{
        min-height: 300px;
      }
      .section-pad{ padding: 28px; }
    }
    @media (max-width: 767.98px){
      body{ padding-bottom: 122px; }
      .hero{
        padding-top: 104px;
      }
      .hero-grid,
      .proof-grid,
      .features-grid,
      .latest-grid{
        grid-template-columns: 1fr;
      }
      .hero-copy,
      .hero-visual,
      .section-pad{
        padding-left: 20px;
        padding-right: 20px;
      }
      .hero-actions .btn,
      .sticky-cta .actions .btn,
      .hero-search .btn{
        width: 100%;
      }
      .metric-chip{
        min-width: calc(50% - 6px);
        flex: 1 1 calc(50% - 6px);
      }
      .section-header{
        flex-direction: column;
        align-items: flex-start;
      }
      .sticky-cta .bar{
        flex-direction: column;
        align-items: stretch;
      }
      .sticky-cta .actions{
        display:grid;
        grid-template-columns: 1fr 1fr;
      }
      .footer-top{
        flex-direction: column;
      }
      .footer-note{
        flex-direction: column;
      }
      .scroll-top{
        bottom: 146px;
      }
    }
    @media (max-width: 575.98px){
      .site-container{
        padding-left: 14px;
        padding-right: 14px;
      }
      .brand-text{
        font-size: .98rem;
      }
      .hero h1{
        font-size: 1.95rem;
      }
      .hero p.lead{
        font-size: .98rem;
      }
      .metric-chip{
        min-width: 100%;
      }
      .sticky-cta .actions{
        grid-template-columns: 1fr;
      }
      .poster-card{
        min-height: 240px;
      }
      .section-pad{
        padding: 18px;
      }
      .feature-card,
      .scene-card,
      .recommend-card,
      .timeline-card,
      .sidebar-card{
        border-radius: 20px;
      }
    }
    @media (prefers-reduced-motion: reduce){
      html{ scroll-behavior: auto; }
      *, *::before, *::after{
        animation-duration: .01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: .01ms !important;
        scroll-behavior: auto !important;
      }
    }

/* roulang page: article */
:root{
      --bg: #f4f7fb;
      --bg-2: #edf3fa;
      --surface: rgba(255,255,255,.82);
      --surface-strong: #ffffff;
      --surface-soft: #f8fbfe;
      --brand: #2e67b7;
      --brand-2: #4a8bd8;
      --brand-3: #dcecff;
      --accent: #2fb7c4;
      --accent-2: #dff7f9;
      --text: #1f2a37;
      --muted: #66758a;
      --line: rgba(55, 84, 126, .14);
      --line-strong: rgba(46,103,183,.18);
      --shadow: 0 18px 60px rgba(36, 58, 92, .10);
      --shadow-2: 0 14px 36px rgba(36, 58, 92, .12);
      --shadow-soft: 0 10px 28px rgba(36, 58, 92, .08);
      --radius-xl: 28px;
      --radius-lg: 22px;
      --radius-md: 18px;
      --radius-sm: 14px;
      --transition: all .24s ease;
      --container: 1280px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC","Segoe UI",Arial,sans-serif;
      color:var(--text);
      background:
        radial-gradient(1000px 560px at 10% -5%, rgba(46,103,183,.14), transparent 56%),
        radial-gradient(840px 520px at 95% 8%, rgba(47,183,196,.12), transparent 54%),
        linear-gradient(180deg, #f8fbff 0%, #f3f7fc 100%);
      line-height:1.75;
      overflow-x:hidden;
    }
    main, section, article, aside, nav, header, footer{display:block}
    img{max-width:100%; display:block}
    a{color:inherit; text-decoration:none}
    a:hover{color:var(--brand)}
    button, input, textarea, select{font:inherit}
    ::selection{background:rgba(46,103,183,.16); color:#173257}
    :focus-visible{
      outline:none;
      box-shadow:0 0 0 .22rem rgba(46,103,183,.16);
    }
    .text-muted-2{color:var(--muted)!important}
    .site-header{
      position:fixed;
      inset:0 0 auto 0;
      z-index:1030;
      transition:var(--transition);
      padding:14px 0;
      background:linear-gradient(180deg, rgba(245,248,252,.52), rgba(245,248,252,.30));
      border-bottom:1px solid transparent;
      backdrop-filter:blur(16px);
      -webkit-backdrop-filter:blur(16px);
    }
    .site-header.is-scrolled{
      background:rgba(255,255,255,.92);
      border-bottom-color:rgba(55,84,126,.10);
      box-shadow:0 12px 38px rgba(33, 55, 85, .08);
    }
    .site-container{
      max-width:var(--container);
      margin:0 auto;
      padding-left:20px;
      padding-right:20px;
    }
    .brand-wrap{
      display:inline-flex;
      align-items:center;
      gap:12px;
      min-width:0;
      color:var(--text);
      font-weight:800;
      letter-spacing:.2px;
      transition:var(--transition);
    }
    .brand-wrap:hover{transform:translateY(-1px); color:var(--text)}
    .brand-mark{
      width:42px;
      height:42px;
      border-radius:14px;
      display:inline-grid;
      place-items:center;
      color:#fff;
      background:linear-gradient(145deg, var(--brand), #4e89d8);
      box-shadow:0 12px 26px rgba(46,103,183,.26);
      flex:0 0 auto;
    }
    .brand-text{
      white-space:nowrap;
      overflow:hidden;
      text-overflow:ellipsis;
      font-size:1.02rem;
    }
    .navbar .nav-link{
      color:rgba(31,42,55,.80);
      font-weight:700;
      border-radius:999px;
      padding:.62rem .95rem;
      transition:var(--transition);
    }
    .navbar .nav-link:hover,
    .navbar .nav-link:focus,
    .navbar .nav-link.active{
      color:var(--brand);
      background:rgba(46,103,183,.10);
    }
    .nav-search{
      min-width:290px;
    }
    .search-shell{
      display:flex;
      align-items:center;
      gap:10px;
      padding:8px 10px 8px 14px;
      border-radius:999px;
      border:1px solid rgba(55,84,126,.14);
      background:rgba(255,255,255,.86);
      box-shadow:0 12px 30px rgba(36,58,92,.06);
      transition:var(--transition);
    }
    .search-shell:focus-within{
      border-color:rgba(46,103,183,.32);
      box-shadow:0 16px 34px rgba(46,103,183,.10);
    }
    .search-shell input{
      border:0;
      background:transparent;
      width:100%;
      min-width:0;
      color:var(--text);
      outline:none;
    }
    .search-shell input::placeholder{color:#8191a5}
    .btn-brand,
    .btn-brand-outline,
    .btn-soft{
      border-radius:999px;
      padding:.82rem 1.18rem;
      font-weight:700;
      transition:var(--transition);
      border:1px solid transparent;
    }
    .btn-brand{
      background:linear-gradient(135deg, var(--brand), var(--brand-2));
      color:#fff;
      box-shadow:0 14px 28px rgba(46,103,183,.20);
    }
    .btn-brand:hover{
      color:#fff;
      transform:translateY(-1px);
      box-shadow:0 18px 36px rgba(46,103,183,.24);
      filter:brightness(1.02);
    }
    .btn-brand:active{
      transform:translateY(0);
      box-shadow:0 10px 20px rgba(46,103,183,.18);
    }
    .btn-brand-outline{
      background:rgba(255,255,255,.78);
      color:var(--brand);
      border-color:rgba(46,103,183,.18);
    }
    .btn-brand-outline:hover{
      color:var(--brand);
      background:rgba(46,103,183,.08);
      transform:translateY(-1px);
    }
    .btn-soft{
      background:rgba(47,183,196,.10);
      color:#1f6b74;
      border-color:rgba(47,183,196,.16);
    }
    .btn-soft:hover{
      background:rgba(47,183,196,.16);
      color:#16555d;
      transform:translateY(-1px);
    }
    .chip{
      display:inline-flex;
      align-items:center;
      gap:6px;
      padding:.45rem .8rem;
      border-radius:999px;
      background:rgba(46,103,183,.08);
      color:var(--brand);
      border:1px solid rgba(46,103,183,.12);
      font-size:.88rem;
      font-weight:700;
      letter-spacing:.1px;
    }
    .chip.soft{
      background:rgba(47,183,196,.10);
      color:#1f7180;
      border-color:rgba(47,183,196,.14);
    }
    .page-main{
      padding-top:104px;
    }
    .article-hero{
      position:relative;
      padding:22px 0 14px;
    }
    .crumbs-row{
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:16px;
      margin-bottom:16px;
      flex-wrap:wrap;
    }
    .breadcrumbs{
      display:flex;
      align-items:center;
      flex-wrap:wrap;
      gap:8px;
      color:var(--muted);
      font-size:.94rem;
    }
    .breadcrumbs a{
      color:#4d6483;
      transition:var(--transition);
    }
    .breadcrumbs a:hover{color:var(--brand)}
    .breadcrumbs .sep{
      color:#b3c0d0;
    }
    .update-pill{
      display:inline-flex;
      align-items:center;
      gap:8px;
      padding:.52rem .86rem;
      border-radius:999px;
      background:rgba(46,103,183,.08);
      color:var(--brand);
      border:1px solid rgba(46,103,183,.12);
      font-size:.88rem;
      font-weight:700;
      box-shadow:0 8px 20px rgba(46,103,183,.06);
    }
    .article-hero-card{
      display:grid;
      grid-template-columns:minmax(0,1.45fr) minmax(300px, 400px);
      gap:22px;
      background:var(--surface);
      border:1px solid var(--line);
      box-shadow:var(--shadow);
      border-radius:var(--radius-xl);
      padding:28px;
      backdrop-filter:blur(16px);
      -webkit-backdrop-filter:blur(16px);
      position:relative;
      overflow:hidden;
    }
    .article-hero-card::before{
      content:"";
      position:absolute;
      inset:auto -80px -80px auto;
      width:220px;
      height:220px;
      border-radius:50%;
      background:radial-gradient(circle, rgba(46,103,183,.14), rgba(46,103,183,0) 68%);
      pointer-events:none;
    }
    .article-title{
      margin:0;
      font-size:clamp(2rem, 3.5vw, 3.15rem);
      line-height:1.18;
      letter-spacing:-.02em;
      color:#17263d;
      font-weight:900;
    }
    .article-lead{
      margin:16px 0 0;
      color:var(--muted);
      font-size:1.03rem;
      max-width:58rem;
    }
    .article-meta{
      display:flex;
      flex-wrap:wrap;
      gap:10px;
      margin-top:18px;
    }
    .article-meta .meta-item{
      display:inline-flex;
      align-items:center;
      gap:8px;
      padding:.58rem .9rem;
      background:var(--surface-soft);
      border:1px solid var(--line);
      border-radius:999px;
      color:var(--muted);
      font-weight:600;
      box-shadow:0 8px 20px rgba(36,58,92,.04);
    }
    .article-hero-panel{
      position:relative;
      overflow:hidden;
      padding:22px;
      border-radius:24px;
      background:linear-gradient(160deg, #e9f2ff 0, #f7fbff 44%, #eef9fb 100%);
      border:1px solid rgba(46,103,183,.16);
      box-shadow:inset 0 1px 0 rgba(255,255,255,.65);
      display:flex;
      flex-direction:column;
      gap:14px;
      justify-content:space-between;
    }
    .article-hero-panel::before{
      content:"";
      position:absolute;
      width:210px;
      height:210px;
      border-radius:50%;
      right:-56px;
      top:-62px;
      background:radial-gradient(circle, rgba(47,183,196,.18), rgba(47,183,196,0) 64%);
      pointer-events:none;
    }
    .panel-kicker{
      display:inline-flex;
      align-items:center;
      gap:8px;
      font-size:.88rem;
      color:var(--brand);
      font-weight:800;
      text-transform:uppercase;
      letter-spacing:.06em;
    }
    .article-hero-panel h2{
      margin:10px 0 0;
      font-size:1.22rem;
      line-height:1.4;
      font-weight:900;
      color:#1d3150;
      position:relative;
      z-index:1;
    }
    .article-hero-panel p{
      margin:8px 0 0;
      color:var(--muted);
      position:relative;
      z-index:1;
    }
    .panel-stat-grid{
      display:grid;
      grid-template-columns:1fr 1fr;
      gap:12px;
      position:relative;
      z-index:1;
    }
    .panel-stat{
      padding:14px 16px;
      background:rgba(255,255,255,.78);
      border:1px solid rgba(55,84,126,.10);
      border-radius:18px;
      box-shadow:var(--shadow-soft);
    }
    .panel-stat span{
      display:block;
      color:var(--muted);
      font-size:.88rem;
    }
    .panel-stat strong{
      display:block;
      margin-top:4px;
      color:#20314a;
      font-size:1.1rem;
      font-weight:900;
    }
    .panel-list{
      margin:0;
      padding:0;
      list-style:none;
      position:relative;
      z-index:1;
    }
    .panel-list li{
      display:flex;
      gap:10px;
      align-items:flex-start;
      padding:10px 0;
      border-top:1px dashed rgba(55,84,126,.12);
      color:#2e425f;
    }
    .panel-list li:first-child{
      border-top:0;
      padding-top:0;
    }
    .panel-list i{
      color:var(--accent);
      margin-top:.25rem;
    }
    .page-section{
      padding:16px 0 24px;
    }
    .content-card,
    .aside-card,
    .related-card,
    .empty-state-shell{
      background:var(--surface-strong);
      border:1px solid var(--line);
      border-radius:var(--radius-xl);
      box-shadow:var(--shadow-soft);
    }
    .content-card{
      padding:24px;
    }
    .section-head{
      display:flex;
      align-items:end;
      justify-content:space-between;
      gap:16px;
      margin-bottom:18px;
    }
    .section-head h2,
    .section-head h3{
      margin:0;
      font-size:1.28rem;
      font-weight:800;
      color:#20314a;
    }
    .section-head p{
      margin:.35rem 0 0;
      color:var(--muted);
    }
    .article-content{
      font-size:1.02rem;
      line-height:1.9;
      color:var(--text);
    }
    .article-content > *:first-child{margin-top:0}
    .article-content h2,
    .article-content h3{
      scroll-margin-top:120px;
      margin-top:1.8rem;
      margin-bottom:1rem;
      font-weight:800;
      color:#18314f;
    }
    .article-content h2{
      font-size:1.35rem;
      padding-left:.8rem;
      border-left:4px solid rgba(46,103,183,.26);
    }
    .article-content h3{
      font-size:1.12rem;
    }
    .article-content p{
      margin:0 0 1rem;
    }
    .article-content ul,
    .article-content ol{
      padding-left:1.3rem;
      margin:0 0 1rem;
    }
    .article-content li{
      margin:.35rem 0;
    }
    .article-content blockquote{
      margin:1.2rem 0;
      padding:1rem 1.1rem;
      border-left:4px solid rgba(47,183,196,.45);
      background:rgba(47,183,196,.08);
      border-radius:0 var(--radius-md) var(--radius-md) 0;
      color:#23535c;
    }
    .article-content img{
      margin:1.2rem auto;
      border-radius:var(--radius-lg);
      box-shadow:var(--shadow-soft);
      border:1px solid var(--line);
    }
    .article-content figure{
      margin:1.2rem 0;
    }
    .article-content figcaption{
      font-size:.92rem;
      color:var(--muted);
      margin-top:.55rem;
    }
    .article-content hr{
      border:0;
      height:1px;
      background:var(--line);
      margin:1.5rem 0;
    }
    .article-content table{
      width:100%;
      border-collapse:collapse;
      overflow-x:auto;
      display:block;
      border-radius:var(--radius-md);
      border:1px solid var(--line);
    }
    .article-content th,
    .article-content td{
      padding:.8rem .9rem;
      border-bottom:1px solid rgba(55,84,126,.10);
      white-space:nowrap;
      background:#fff;
    }
    .article-content pre{
      padding:1rem 1.1rem;
      background:#f7fbff;
      border-radius:var(--radius-md);
      overflow:auto;
      border:1px solid var(--line);
    }
    .article-content code{
      background:#edf5ff;
      padding:.14rem .34rem;
      border-radius:8px;
      color:#234e8e;
    }
    .article-aside{
      position:relative;
    }
    .aside-card{
      padding:20px;
      margin-bottom:16px;
    }
    .aside-title{
      font-size:1rem;
      font-weight:800;
      margin-bottom:14px;
      color:#20314a;
    }
    .toc-list{
      display:flex;
      flex-direction:column;
      gap:8px;
    }
    .toc-link{
      display:flex;
      gap:10px;
      align-items:flex-start;
      padding:10px 12px;
      border-radius:16px;
      background:var(--surface-soft);
      border:1px solid transparent;
      color:var(--text);
      transition:var(--transition);
    }
    .toc-link span{
      flex:0 0 auto;
      width:24px;
      height:24px;
      border-radius:8px;
      display:grid;
      place-items:center;
      background:rgba(46,103,183,.10);
      color:var(--brand);
      font-size:.78rem;
      font-weight:800;
    }
    .toc-link strong{
      display:block;
      font-size:.92rem;
      line-height:1.45;
      font-weight:700;
    }
    .toc-link:hover,
    .toc-link:focus{
      transform:translateY(-1px);
      border-color:rgba(46,103,183,.16);
      box-shadow:var(--shadow-soft);
      color:var(--text);
    }
    .toc-empty{
      padding:14px;
      border-radius:16px;
      background:rgba(46,103,183,.06);
      color:var(--muted);
    }
    .aside-list{
      list-style:none;
      padding:0;
      margin:0;
    }
    .aside-list li{
      display:flex;
      justify-content:space-between;
      gap:16px;
      padding:10px 0;
      border-bottom:1px solid rgba(55,84,126,.10);
    }
    .aside-list li:last-child{
      border-bottom:0;
      padding-bottom:0;
    }
    .aside-list strong{
      color:#20314a;
    }
    .aside-list span{
      color:var(--muted);
      text-align:right;
    }
    .tag-cloud{
      display:flex;
      flex-wrap:wrap;
      gap:10px;
      margin-top:10px;
    }
    .tag-chip{
      display:inline-flex;
      align-items:center;
      padding:.42rem .72rem;
      border-radius:999px;
      background:rgba(46,103,183,.08);
      color:var(--brand);
      border:1px solid rgba(46,103,183,.12);
      font-size:.88rem;
      font-weight:700;
    }
    .quick-links{
      display:grid;
      gap:10px;
    }
    .related-grid{
      display:grid;
      grid-template-columns:repeat(3, minmax(0,1fr));
      gap:16px;
    }
    .related-card{
      padding:18px;
      display:flex;
      flex-direction:column;
      gap:12px;
      height:100%;
      transition:var(--transition);
    }
    .related-card:hover{
      transform:translateY(-2px);
      box-shadow:var(--shadow);
      border-color:rgba(46,103,183,.18);
    }
    .related-icon{
      width:44px;
      height:44px;
      border-radius:16px;
      display:grid;
      place-items:center;
      background:linear-gradient(145deg, rgba(46,103,183,.12), rgba(47,183,196,.16));
      color:var(--brand);
      font-size:1.1rem;
    }
    .related-card h3{
      font-size:1.02rem;
      margin:0;
      color:#20314a;
    }
    .related-card p{
      margin:0;
      color:var(--muted);
      font-size:.95rem;
    }
    .related-card .link-row{
      margin-top:auto;
    }
    .faq-wrap .accordion-item{
      border:1px solid var(--line);
      border-radius:18px !important;
      overflow:hidden;
      margin-bottom:12px;
      background:var(--surface-strong);
      box-shadow:var(--shadow-soft);
    }
    .faq-wrap .accordion-button{
      background:#fff;
      color:#20314a;
      font-weight:800;
      box-shadow:none;
      padding:1rem 1.1rem;
    }
    .faq-wrap .accordion-button:not(.collapsed){
      color:var(--brand);
      background:rgba(46,103,183,.06);
    }
    .faq-wrap .accordion-button::after{
      filter:saturate(.85) brightness(.85);
    }
    .faq-wrap .accordion-body{
      color:var(--muted);
      padding:0 1.1rem 1.05rem;
    }
    .empty-state-shell{
      padding:42px 28px;
      text-align:center;
      max-width:720px;
      margin:0 auto;
    }
    .empty-state-shell h1{
      margin:0 0 10px;
      font-size:clamp(1.6rem, 4vw, 2.2rem);
      font-weight:900;
      color:#1d3050;
    }
    .empty-state-shell p{
      margin:0 auto 18px;
      max-width:38rem;
      color:var(--muted);
    }
    .footer{
      padding:26px 0 36px;
      margin-top:30px;
    }
    .footer-shell{
      background:linear-gradient(180deg, rgba(255,255,255,.92), rgba(248,251,254,.96));
      border:1px solid var(--line);
      box-shadow:var(--shadow-soft);
      border-radius:28px;
      padding:26px;
    }
    .footer-top{
      display:flex;
      justify-content:space-between;
      gap:24px;
      align-items:flex-start;
    }
    .footer-brand{
      display:inline-flex;
      align-items:center;
      gap:12px;
      font-weight:800;
      color:#20314a;
    }
    .footer-links{
      display:flex;
      flex-wrap:wrap;
      gap:10px;
    }
    .footer-links a{
      padding:.5rem .8rem;
      border-radius:999px;
      color:#42556d;
      background:rgba(46,103,183,.06);
      border:1px solid rgba(46,103,183,.08);
      transition:var(--transition);
    }
    .footer-links a:hover{
      color:var(--brand);
      transform:translateY(-1px);
      background:rgba(46,103,183,.10);
    }
    .footer-note{
      display:flex;
      justify-content:space-between;
      gap:12px;
      flex-wrap:wrap;
      margin-top:18px;
      padding-top:16px;
      border-top:1px solid rgba(55,84,126,.10);
      color:var(--muted);
      font-size:.94rem;
    }
    .reading-progress{
      position:fixed;
      top:0;
      left:0;
      right:0;
      height:3px;
      z-index:1050;
      background:transparent;
      pointer-events:none;
    }
    .reading-progress span{
      display:block;
      height:100%;
      width:0;
      background:linear-gradient(90deg, var(--brand), var(--accent));
      box-shadow:0 0 16px rgba(46,103,183,.34);
    }
    .back-top{
      position:fixed;
      right:18px;
      bottom:20px;
      width:48px;
      height:48px;
      border-radius:16px;
      border:1px solid rgba(46,103,183,.18);
      background:rgba(255,255,255,.9);
      color:var(--brand);
      display:grid;
      place-items:center;
      box-shadow:var(--shadow-2);
      opacity:0;
      visibility:hidden;
      transform:translateY(10px);
      transition:var(--transition);
      z-index:1040;
    }
    .back-top.show{
      opacity:1;
      visibility:visible;
      transform:translateY(0);
    }
    .back-top:hover{
      transform:translateY(-2px);
      color:#1f56a0;
    }
    .back-top:active{
      transform:translateY(0);
    }
    .navbar-toggler{
      width:44px;
      height:44px;
      border-radius:14px;
      background:rgba(255,255,255,.86);
      border:1px solid var(--line);
      display:grid;
      place-items:center;
      transition:var(--transition);
    }
    .navbar-toggler:hover{
      border-color:rgba(46,103,183,.26);
      box-shadow:var(--shadow-soft);
    }
    .navbar-toggler-icon{
      width:20px;
      height:20px;
      background-image:url("data:image/svg+xml;charset=utf8,%3Csvg viewBox='0 0 30 30' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath stroke='%232e67b7' stroke-width='2.2' stroke-linecap='round' stroke-miterlimit='10' d='M4 7h22M4 15h22M4 23h22'/%3E%3C/svg%3E");
    }
    .navbar-collapse .navbar-nav{
      align-items:flex-start;
    }
    .article-action-row{
      display:flex;
      flex-wrap:wrap;
      gap:10px;
      margin-top:22px;
    }
    .article-action-row .btn{
      min-width:140px;
      justify-content:center;
    }
    .support-note{
      margin-top:12px;
      color:var(--muted);
      font-size:.94rem;
    }
    .mini-divider{
      width:100%;
      height:1px;
      background:linear-gradient(90deg, rgba(46,103,183,.22), rgba(47,183,196,.18), transparent);
      margin:18px 0;
    }
    @media (min-width: 992px){
      .navbar-collapse{display:flex !important}
    }
    @media (max-width: 1199.98px){
      .related-grid{grid-template-columns:repeat(2, minmax(0,1fr))}
      .article-hero-card{grid-template-columns:minmax(0,1fr) 340px}
    }
    @media (max-width: 991.98px){
      .site-header{padding:12px 0}
      .navbar-collapse{
        margin-top:14px;
        padding:16px;
        border-radius:22px;
        background:rgba(255,255,255,.94);
        border:1px solid rgba(55,84,126,.12);
        box-shadow:var(--shadow-soft);
      }
      .nav-search{min-width:0; width:100%}
      .search-shell{width:100%}
      .page-main{padding-top:102px}
      .article-hero-card{grid-template-columns:1fr}
      .footer-top{flex-direction:column}
    }
    @media (max-width: 767.98px){
      .site-container{padding-left:16px; padding-right:16px}
      .brand-text{font-size:.98rem}
      .article-hero{padding-top:18px}
      .article-hero-card,
      .content-card,
      .aside-card,
      .footer-shell,
      .empty-state-shell{border-radius:22px}
      .article-content{font-size:1rem}
      .related-grid{grid-template-columns:1fr}
      .section-head{flex-direction:column; align-items:flex-start}
      .footer-note{flex-direction:column}
      .article-meta{gap:8px}
    }
    @media (max-width: 575.98px){
      .navbar-nav .nav-link{width:100%; text-align:left}
      .search-shell{
        flex-wrap:wrap;
        border-radius:22px;
        padding:12px;
      }
      .search-shell input{
        order:1;
        width:100%;
      }
      .search-shell .btn{
        order:2;
        width:100%;
      }
      .btn-brand, .btn-brand-outline, .btn-soft{
        width:100%;
        justify-content:center;
      }
      .article-meta{
        flex-direction:column;
      }
      .article-meta .meta-item{
        width:100%;
      }
      .back-top{
        right:14px;
        bottom:14px;
      }
      .footer-links{
        display:grid;
        grid-template-columns:1fr 1fr;
      }
      .panel-stat-grid{
        grid-template-columns:1fr;
      }
      .article-hero-card{
        padding:20px;
      }
      .content-card{
        padding:20px;
      }
    }

/* roulang: framework shim */
/* 覆盖 Bootstrap 等对 a/btn 的全局默认，避免导航出现下划线/蓝链 */
.site-header a,.site-header a:hover,.navbar a,.navbar a:hover,.nav-links a,.nav-links a:hover,header nav a,header nav a:hover{text-decoration:none}
.site-header .btn,.navbar .btn,.nav-cta{text-decoration:none}