/* roulang page: index */
:root{
      --bg: #f4f8fc;
      --bg-soft: #edf4fb;
      --surface: rgba(255,255,255,.88);
      --surface-solid: #ffffff;
      --surface-2: #f8fbff;
      --text: #17324d;
      --muted: #6c7f95;
      --line: rgba(35, 74, 116, .12);
      --line-2: rgba(35, 74, 116, .08);
      --primary: #2f6fb3;
      --primary-2: #4d8fd5;
      --primary-soft: rgba(47,111,179,.12);
      --accent: #69a9e8;
      --success: #1ea672;
      --warning: #e7a92f;
      --shadow-sm: 0 8px 24px rgba(34, 66, 99, .06);
      --shadow-md: 0 18px 44px rgba(34, 66, 99, .10);
      --shadow-lg: 0 28px 60px rgba(34, 66, 99, .16);
      --radius-sm: 14px;
      --radius: 18px;
      --radius-lg: 26px;
      --container: 1180px;
      --transition: 220ms cubic-bezier(.2,.7,.2,1);
    }

    *{ box-sizing: border-box; }
    html{
      scroll-behavior: smooth;
    }
    body{
      margin: 0;
      color: var(--text);
      font-family: -apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",system-ui,sans-serif;
      line-height: 1.72;
      background:
        radial-gradient(circle at 10% 0%, rgba(77,143,213,.13), transparent 30%),
        radial-gradient(circle at 90% 10%, rgba(105,169,232,.12), transparent 24%),
        linear-gradient(180deg, #fbfdff 0%, var(--bg) 32%, #f7faff 100%);
      min-height: 100vh;
      text-rendering: optimizeLegibility;
      -webkit-font-smoothing: antialiased;
    }
    img{ max-width:100%; display:block; }
    a{
      color: inherit;
      text-decoration: none;
      transition: color var(--transition), background-color var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
    }
    a:hover{ color: var(--primary); }
    button,
    .btn,
    input,
    textarea{
      font: inherit;
    }
    ::selection{
      background: rgba(47,111,179,.18);
      color: var(--text);
    }
    :focus-visible{
      outline: 3px solid rgba(47,111,179,.25);
      outline-offset: 2px;
    }

    .page-shell{
      position: relative;
      overflow: clip;
    }
    .bg-orb{
      position: absolute;
      border-radius: 999px;
      filter: blur(2px);
      pointer-events: none;
      opacity: .75;
      z-index: 0;
    }
    .orb-1{
      width: 320px;
      height: 320px;
      left: -120px;
      top: 180px;
      background: radial-gradient(circle, rgba(77,143,213,.22) 0%, rgba(77,143,213,0) 70%);
    }
    .orb-2{
      width: 260px;
      height: 260px;
      right: -100px;
      top: 680px;
      background: radial-gradient(circle, rgba(105,169,232,.16) 0%, rgba(105,169,232,0) 70%);
    }

    .container-custom{
      width: min(100% - 2rem, var(--container));
      margin-inline: auto;
      position: relative;
      z-index: 1;
    }

    .site-header{
      position: sticky;
      top: 0;
      z-index: 1030;
      backdrop-filter: blur(18px);
      background: rgba(247, 250, 253, .82);
      border-bottom: 1px solid rgba(35, 74, 116, .08);
    }
    .site-header .nav-wrap{
      display: flex;
      align-items: center;
      gap: 1rem;
      padding: 1rem 0;
    }
    .brand{
      display: inline-flex;
      align-items: center;
      gap: .8rem;
      font-weight: 800;
      letter-spacing: .2px;
      color: var(--text);
      white-space: nowrap;
      flex: 0 0 auto;
    }
    .brand-mark{
      width: 42px;
      height: 42px;
      border-radius: 14px;
      display: grid;
      place-items: center;
      color: #fff;
      background:
        linear-gradient(145deg, var(--primary) 0%, var(--primary-2) 100%);
      box-shadow: 0 12px 24px rgba(47,111,179,.22);
      flex: 0 0 auto;
    }
    .brand-mark i{ font-size: 1.2rem; }
    .brand span{
      font-size: 1.06rem;
    }
    .chip-nav{
      display: flex;
      align-items: center;
      gap: .55rem;
      flex-wrap: nowrap;
      overflow-x: auto;
      overflow-y: hidden;
      scrollbar-width: none;
      -ms-overflow-style: none;
      padding: .25rem .15rem;
      margin-inline: auto;
      max-width: 100%;
    }
    .chip-nav::-webkit-scrollbar{ display:none; }
    .chip{
      display: inline-flex;
      align-items: center;
      gap: .45rem;
      padding: .62rem .95rem;
      border-radius: 999px;
      border: 1px solid transparent;
      color: var(--muted);
      background: transparent;
      font-size: .95rem;
      font-weight: 600;
      white-space: nowrap;
      transition: transform var(--transition), border-color var(--transition), background-color var(--transition), color var(--transition), box-shadow var(--transition);
    }
    .chip:hover{
      background: rgba(255,255,255,.8);
      border-color: var(--line);
      color: var(--primary);
      box-shadow: 0 10px 24px rgba(34,66,99,.06);
      transform: translateY(-1px);
    }
    .chip.active{
      background: linear-gradient(180deg, rgba(47,111,179,.14), rgba(47,111,179,.08));
      border-color: rgba(47,111,179,.16);
      color: var(--primary);
      box-shadow: inset 0 0 0 1px rgba(47,111,179,.04);
    }
    .header-cta{
      display: inline-flex;
      align-items: center;
      gap: .5rem;
      flex: 0 0 auto;
    }

    .btn{
      border-radius: 999px;
      padding: .8rem 1.15rem;
      font-weight: 700;
      transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition), border-color var(--transition), color var(--transition), opacity var(--transition);
    }
    .btn:hover{ transform: translateY(-1px); }
    .btn:active{ transform: translateY(0); }
    .btn-primary{
      border: 1px solid rgba(47,111,179,.12);
      background: linear-gradient(180deg, var(--primary-2), var(--primary));
      color: #fff;
      box-shadow: 0 14px 28px rgba(47,111,179,.22);
    }
    .btn-primary:hover{
      color: #fff;
      box-shadow: 0 18px 36px rgba(47,111,179,.30);
      filter: saturate(1.03);
    }
    .btn-outline-primary{
      border: 1px solid rgba(47,111,179,.22);
      color: var(--primary);
      background: rgba(255,255,255,.75);
      box-shadow: 0 10px 18px rgba(34,66,99,.05);
    }
    .btn-outline-primary:hover{
      background: rgba(47,111,179,.08);
      color: var(--primary);
      border-color: rgba(47,111,179,.28);
    }
    .btn-lightish{
      background: rgba(255,255,255,.82);
      color: var(--text);
      border: 1px solid rgba(35,74,116,.10);
    }
    .btn-lightish:hover{
      background: #fff;
      border-color: rgba(47,111,179,.16);
      color: var(--primary);
    }

    .hero{
      padding: 2rem 0 1.2rem;
    }
    .hero-panel{
      position: relative;
      overflow: hidden;
      border: 1px solid rgba(35,74,116,.10);
      background:
        linear-gradient(135deg, rgba(255,255,255,.90) 0%, rgba(244,248,252,.92) 100%);
      border-radius: 30px;
      box-shadow: var(--shadow-lg);
      padding: clamp(1.25rem, 3vw, 2rem);
    }
    .hero-panel::before,
    .hero-panel::after{
      content:"";
      position: absolute;
      border-radius: 999px;
      pointer-events: none;
    }
    .hero-panel::before{
      width: 180px;
      height: 180px;
      background: radial-gradient(circle, rgba(77,143,213,.16) 0%, rgba(77,143,213,0) 72%);
      top: -45px;
      right: 8%;
    }
    .hero-panel::after{
      width: 220px;
      height: 220px;
      background: radial-gradient(circle, rgba(105,169,232,.14) 0%, rgba(105,169,232,0) 72%);
      bottom: -80px;
      left: -40px;
    }
    .hero-grid{
      display: grid;
      grid-template-columns: 1.28fr .92fr;
      gap: 1.35rem;
      align-items: stretch;
    }
    .eyebrow{
      display: inline-flex;
      align-items: center;
      gap: .45rem;
      padding: .42rem .75rem;
      border-radius: 999px;
      background: rgba(47,111,179,.10);
      color: var(--primary);
      font-size: .86rem;
      font-weight: 700;
      border: 1px solid rgba(47,111,179,.10);
    }
    .hero h1{
      margin: .85rem 0 .85rem;
      font-size: clamp(2rem, 4vw, 3.55rem);
      line-height: 1.12;
      letter-spacing: -.02em;
      font-weight: 900;
    }
    .hero-lead{
      max-width: 58ch;
      color: var(--muted);
      font-size: 1.03rem;
      margin-bottom: 1.2rem;
    }
    .hero-actions{
      display: flex;
      flex-wrap: wrap;
      gap: .75rem;
      align-items: center;
      margin-bottom: 1.2rem;
    }
    .hero-tags{
      display: flex;
      flex-wrap: wrap;
      gap: .55rem;
      margin-top: .7rem;
    }
    .mini-tag{
      display: inline-flex;
      align-items: center;
      gap: .35rem;
      padding: .44rem .72rem;
      border-radius: 999px;
      background: rgba(255,255,255,.82);
      border: 1px solid rgba(35,74,116,.10);
      color: var(--muted);
      font-size: .88rem;
      font-weight: 600;
    }
    .mini-tag i{ color: var(--primary); }

    .hero-aside{
      display: grid;
      gap: .85rem;
      align-content: start;
    }
    .hero-board,
    .panel-card,
    .update-card,
    .compare-card,
    .topic-card,
    .faq-shell,
    .cta-shell{
      background: var(--surface);
      border: 1px solid rgba(35,74,116,.10);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
    }
    .hero-board{
      padding: 1rem;
      backdrop-filter: blur(8px);
    }
    .board-top{
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: .75rem;
      margin-bottom: .85rem;
    }
    .board-top strong{
      font-size: 1rem;
    }
    .status-pill{
      display: inline-flex;
      align-items: center;
      gap: .4rem;
      padding: .35rem .65rem;
      border-radius: 999px;
      background: rgba(30,166,114,.12);
      color: var(--success);
      font-size: .84rem;
      font-weight: 700;
    }
    .status-pill .dot{
      width: 8px;
      height: 8px;
      border-radius: 999px;
      background: currentColor;
      box-shadow: 0 0 0 4px rgba(30,166,114,.12);
    }
    .metric-grid{
      display: grid;
      grid-template-columns: repeat(2, minmax(0,1fr));
      gap: .75rem;
    }
    .metric-card{
      padding: .95rem;
      border-radius: 18px;
      background: linear-gradient(180deg, rgba(255,255,255,.88), rgba(248,251,255,.95));
      border: 1px solid rgba(35,74,116,.08);
      transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    }
    .metric-card:hover{
      transform: translateY(-2px);
      border-color: rgba(47,111,179,.16);
      box-shadow: 0 16px 28px rgba(34,66,99,.08);
    }
    .metric-value{
      display: flex;
      align-items: baseline;
      gap: .4rem;
      font-size: 1.55rem;
      line-height: 1.1;
      font-weight: 900;
      color: var(--text);
      margin-bottom: .25rem;
    }
    .metric-value small{
      font-size: .86rem;
      font-weight: 700;
      color: var(--primary);
    }
    .metric-label{
      color: var(--muted);
      font-size: .9rem;
    }
    .metric-foot{
      margin-top: .55rem;
      display: inline-flex;
      align-items: center;
      gap: .38rem;
      color: var(--primary);
      font-size: .84rem;
      font-weight: 700;
    }

    .board-list{
      display: grid;
      gap: .7rem;
      margin-top: .85rem;
    }
    .board-item{
      display: flex;
      align-items: center;
      gap: .8rem;
      padding: .85rem .95rem;
      border-radius: 18px;
      background: rgba(255,255,255,.82);
      border: 1px solid rgba(35,74,116,.08);
    }
    .board-icon{
      width: 38px;
      height: 38px;
      border-radius: 13px;
      display: grid;
      place-items: center;
      background: rgba(47,111,179,.10);
      color: var(--primary);
      flex: 0 0 auto;
    }
    .board-item strong{
      display: block;
      line-height: 1.2;
      margin-bottom: .14rem;
      font-size: .94rem;
    }
    .board-item span{
      color: var(--muted);
      font-size: .86rem;
    }

    .section{
      padding: 1rem 0;
    }
    .section-head{
      display: flex;
      align-items: end;
      justify-content: space-between;
      gap: 1rem;
      margin-bottom: 1rem;
      flex-wrap: wrap;
    }
    .section-title{
      margin: 0;
      font-size: clamp(1.45rem, 2vw, 2rem);
      font-weight: 900;
      line-height: 1.2;
      letter-spacing: -.02em;
    }
    .section-lead{
      margin: .35rem 0 0;
      color: var(--muted);
      max-width: 72ch;
    }

    .panel-card{
      padding: 1rem;
    }
    .entry-grid{
      display: grid;
      grid-template-columns: repeat(4, minmax(0,1fr));
      gap: 1rem;
    }
    .entry-card{
      padding: 1rem;
      border-radius: 22px;
      background: linear-gradient(180deg, rgba(255,255,255,.92), rgba(246,249,253,.98));
      border: 1px solid rgba(35,74,116,.08);
      box-shadow: 0 10px 22px rgba(34,66,99,.05);
      height: 100%;
      transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    }
    .entry-card:hover{
      transform: translateY(-3px);
      box-shadow: 0 16px 30px rgba(34,66,99,.10);
      border-color: rgba(47,111,179,.15);
    }
    .entry-icon{
      width: 48px;
      height: 48px;
      border-radius: 16px;
      display: grid;
      place-items: center;
      font-size: 1.3rem;
      color: var(--primary);
      background: linear-gradient(180deg, rgba(47,111,179,.12), rgba(47,111,179,.06));
      border: 1px solid rgba(47,111,179,.10);
      margin-bottom: .85rem;
    }
    .entry-card h3{
      font-size: 1.06rem;
      margin: 0 0 .45rem;
      font-weight: 800;
    }
    .entry-card p{
      margin: 0 0 .85rem;
      color: var(--muted);
      font-size: .95rem;
      min-height: 3.2em;
    }
    .entry-meta{
      display: flex;
      flex-wrap: wrap;
      gap: .45rem;
    }
    .entry-chip{
      display: inline-flex;
      align-items: center;
      gap: .35rem;
      padding: .38rem .65rem;
      border-radius: 999px;
      background: rgba(47,111,179,.08);
      color: var(--primary);
      font-size: .82rem;
      font-weight: 700;
      border: 1px solid rgba(47,111,179,.09);
    }
    .entry-chip.alt{
      background: rgba(30,166,114,.08);
      color: #17795a;
      border-color: rgba(30,166,114,.10);
    }

    .topics-grid{
      display: grid;
      grid-template-columns: 1.05fr 1fr 1fr;
      gap: 1rem;
    }
    .topic-card{
      padding: 1.1rem;
      transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
      position: relative;
      overflow: hidden;
    }
    .topic-card:hover{
      transform: translateY(-3px);
      box-shadow: 0 18px 36px rgba(34,66,99,.10);
      border-color: rgba(47,111,179,.16);
    }
    .topic-card.highlight{
      background:
        linear-gradient(180deg, rgba(47,111,179,.06), rgba(255,255,255,.90)),
        var(--surface);
    }
    .topic-head{
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: .75rem;
      margin-bottom: .7rem;
    }
    .topic-head .topic-icon{
      width: 42px;
      height: 42px;
      border-radius: 14px;
      display: grid;
      place-items: center;
      color: var(--primary);
      background: rgba(47,111,179,.10);
      border: 1px solid rgba(47,111,179,.08);
      flex: 0 0 auto;
    }
    .topic-card h3{
      margin: 0 0 .4rem;
      font-weight: 850;
      font-size: 1.05rem;
    }
    .topic-card p{
      margin: 0;
      color: var(--muted);
      font-size: .95rem;
    }
    .topic-list{
      list-style: none;
      padding: 0;
      margin: .95rem 0 0;
      display: grid;
      gap: .65rem;
    }
    .topic-list li{
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: .75rem;
      padding: .68rem .75rem;
      border-radius: 14px;
      background: rgba(255,255,255,.75);
      border: 1px solid rgba(35,74,116,.08);
    }
    .topic-list span{
      color: var(--muted);
      font-size: .88rem;
    }
    .topic-list strong{
      font-size: .93rem;
    }
    .topic-badge{
      display: inline-flex;
      align-items: center;
      gap: .3rem;
      padding: .32rem .55rem;
      border-radius: 999px;
      background: rgba(47,111,179,.08);
      color: var(--primary);
      font-size: .78rem;
      font-weight: 800;
      white-space: nowrap;
    }

    .compare-grid{
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1rem;
    }
    .compare-card{
      padding: 1.1rem;
      overflow: hidden;
      position: relative;
    }
    .compare-card.left{
      background: linear-gradient(180deg, rgba(255,255,255,.92), rgba(248,250,253,.98));
    }
    .compare-card.right{
      background: linear-gradient(180deg, rgba(235,244,253,.95), rgba(255,255,255,.98));
      border-color: rgba(47,111,179,.14);
    }
    .compare-top{
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: .75rem;
      margin-bottom: .8rem;
    }
    .compare-top h3{
      margin: 0;
      font-size: 1.06rem;
      font-weight: 850;
    }
    .compare-note{
      color: var(--muted);
      font-size: .9rem;
      margin: 0 0 .85rem;
    }
    .compare-row{
      display: grid;
      gap: .45rem;
      margin-bottom: .8rem;
    }
    .compare-label{
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: .8rem;
      font-size: .92rem;
      color: var(--text);
      font-weight: 700;
    }
    .compare-track{
      width: 100%;
      height: 10px;
      border-radius: 999px;
      background: rgba(35,74,116,.10);
      overflow: hidden;
    }
    .compare-bar{
      height: 100%;
      border-radius: inherit;
      background: linear-gradient(90deg, var(--primary-2), var(--primary));
      box-shadow: 0 8px 18px rgba(47,111,179,.22);
    }
    .compare-items{
      display: grid;
      gap: .65rem;
      margin-top: .95rem;
    }
    .compare-item{
      display: flex;
      gap: .75rem;
      align-items: flex-start;
      padding: .82rem .85rem;
      border-radius: 16px;
      background: rgba(255,255,255,.78);
      border: 1px solid rgba(35,74,116,.08);
    }
    .compare-item i{
      color: var(--primary);
      margin-top: .1rem;
    }
    .compare-item strong{
      display: block;
      font-size: .94rem;
      margin-bottom: .15rem;
    }
    .compare-item span{
      color: var(--muted);
      font-size: .9rem;
    }

    .updates-layout{
      display: grid;
      grid-template-columns: 1.2fr .8fr;
      gap: 1rem;
      align-items: start;
    }
    .update-card{
      padding: 1rem;
      display: block;
      margin-bottom: .8rem;
      transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    }
    .update-card:hover{
      transform: translateY(-2px);
      box-shadow: 0 18px 36px rgba(34,66,99,.10);
      border-color: rgba(47,111,179,.16);
    }
    .update-head{
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      gap: .6rem;
      margin-bottom: .55rem;
      align-items: center;
    }
    .update-meta{
      display: flex;
      align-items: center;
      gap: .5rem;
      flex-wrap: wrap;
    }
    .meta-tag{
      display: inline-flex;
      align-items: center;
      gap: .3rem;
      padding: .36rem .58rem;
      border-radius: 999px;
      background: rgba(47,111,179,.10);
      color: var(--primary);
      border: 1px solid rgba(47,111,179,.08);
      font-size: .8rem;
      font-weight: 800;
    }
    .meta-time{
      color: var(--muted);
      font-size: .84rem;
      font-weight: 600;
    }
    .update-card h3{
      margin: .2rem 0 .45rem;
      font-size: 1.05rem;
      line-height: 1.45;
      font-weight: 850;
    }
    .update-card p{
      margin: 0;
      color: var(--muted);
      font-size: .95rem;
    }
    .update-link{
      display: inline-flex;
      align-items: center;
      gap: .45rem;
      margin-top: .85rem;
      color: var(--primary);
      font-weight: 800;
      font-size: .92rem;
    }
    .update-link i{
      transition: transform var(--transition);
    }
    .update-card:hover .update-link i{
      transform: translateX(2px);
    }
    .update-empty{
      padding: 1.2rem;
      border-radius: 18px;
      background: rgba(255,255,255,.84);
      border: 1px dashed rgba(47,111,179,.18);
      color: var(--muted);
      text-align: center;
      font-weight: 700;
    }
    .aside-stack{
      display: grid;
      gap: 1rem;
    }
    .aside-card{
      padding: 1rem;
      border-radius: var(--radius-lg);
      background: var(--surface);
      border: 1px solid rgba(35,74,116,.10);
      box-shadow: var(--shadow-sm);
    }
    .aside-card h3{
      margin: 0 0 .5rem;
      font-size: 1.02rem;
      font-weight: 850;
    }
    .aside-card p{
      margin: 0 0 .85rem;
      color: var(--muted);
      font-size: .94rem;
    }
    .aside-list{
      list-style: none;
      padding: 0;
      margin: 0;
      display: grid;
      gap: .65rem;
    }
    .aside-list li{
      display: flex;
      align-items: flex-start;
      gap: .7rem;
      padding: .78rem .85rem;
      border-radius: 14px;
      background: rgba(255,255,255,.82);
      border: 1px solid rgba(35,74,116,.08);
    }
    .aside-list i{
      color: var(--primary);
      margin-top: .1rem;
      flex: 0 0 auto;
    }
    .aside-list strong{
      display:block;
      font-size:.93rem;
      margin-bottom:.15rem;
    }
    .aside-list span{
      color: var(--muted);
      font-size:.9rem;
    }

    .faq-shell{
      padding: 1.05rem;
    }
    .accordion{
      --bs-accordion-bg: transparent;
      --bs-accordion-border-color: transparent;
      --bs-accordion-color: var(--text);
      --bs-accordion-btn-focus-box-shadow: none;
      --bs-accordion-active-bg: transparent;
      --bs-accordion-active-color: var(--primary);
      --bs-accordion-btn-icon-width: 1.1rem;
      --bs-accordion-btn-padding-x: 1rem;
      --bs-accordion-btn-padding-y: 1rem;
      --bs-accordion-body-padding-x: 1rem;
      --bs-accordion-body-padding-y: 0 .9rem 1rem;
    }
    .accordion-item{
      border: 1px solid rgba(35,74,116,.10);
      border-radius: 18px;
      overflow: hidden;
      background: rgba(255,255,255,.82);
      box-shadow: 0 10px 20px rgba(34,66,99,.05);
      margin-bottom: .8rem;
    }
    .accordion-button{
      font-weight: 800;
      color: var(--text);
      background: rgba(255,255,255,.78);
      box-shadow: none;
    }
    .accordion-button:not(.collapsed){
      color: var(--primary);
      background: linear-gradient(180deg, rgba(47,111,179,.10), rgba(47,111,179,.05));
    }
    .accordion-button::after{
      background-size: .95rem;
      opacity: .75;
    }
    .accordion-body{
      color: var(--muted);
      padding-top: 0;
    }

    .cta-shell{
      padding: 1.15rem;
      position: relative;
      overflow: hidden;
      background:
        linear-gradient(135deg, rgba(47,111,179,.09) 0%, rgba(255,255,255,.95) 42%, rgba(248,251,255,.98) 100%);
    }
    .cta-shell::before{
      content:"";
      position:absolute;
      right:-70px;
      top:-40px;
      width:240px;
      height:240px;
      border-radius:999px;
      background: radial-gradient(circle, rgba(47,111,179,.14) 0%, rgba(47,111,179,0) 70%);
      pointer-events:none;
    }
    .cta-grid{
      display:grid;
      grid-template-columns: 1fr .9fr;
      gap: 1rem;
      align-items: stretch;
      position: relative;
      z-index: 1;
    }
    .cta-copy h2{
      margin: 0 0 .55rem;
      font-size: clamp(1.5rem, 2.6vw, 2.2rem);
      font-weight: 900;
      line-height: 1.18;
    }
    .cta-copy p{
      margin: 0 0 .95rem;
      color: var(--muted);
      max-width: 62ch;
    }
    .cta-points{
      display: grid;
      gap: .65rem;
      margin-top: .95rem;
    }
    .cta-point{
      display: flex;
      gap: .7rem;
      align-items: flex-start;
      padding: .72rem .82rem;
      border-radius: 16px;
      background: rgba(255,255,255,.82);
      border: 1px solid rgba(35,74,116,.08);
    }
    .cta-point i{
      color: var(--primary);
      margin-top: .12rem;
    }
    .cta-point strong{
      display:block;
      font-size:.94rem;
      margin-bottom:.1rem;
    }
    .cta-point span{
      color: var(--muted);
      font-size:.9rem;
    }

    .form-card{
      padding: 1rem;
      border-radius: 24px;
      background: rgba(255,255,255,.92);
      border: 1px solid rgba(35,74,116,.10);
      box-shadow: 0 16px 34px rgba(34,66,99,.08);
      height: 100%;
    }
    .form-label{
      font-weight: 700;
      color: var(--text);
      margin-bottom: .35rem;
    }
    .form-control{
      border-radius: 14px;
      border: 1px solid rgba(35,74,116,.14);
      padding: .82rem .95rem;
      background: #fff;
      color: var(--text);
      box-shadow: none;
      transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition), background-color var(--transition);
    }
    .form-control::placeholder{
      color: #8ca0b4;
    }
    .form-control:focus{
      border-color: rgba(47,111,179,.35);
      box-shadow: 0 0 0 .22rem rgba(47,111,179,.12);
      background: #fff;
    }
    textarea.form-control{
      min-height: 126px;
      resize: vertical;
    }
    .form-help{
      color: var(--muted);
      font-size: .88rem;
      margin-top: .55rem;
    }
    .form-actions{
      display:flex;
      flex-wrap: wrap;
      gap: .75rem;
      margin-top: .95rem;
    }

    .site-footer{
      margin-top: 1.25rem;
      padding: 1.4rem 0 1.7rem;
    }
    .footer-shell{
      padding: 1.15rem;
      border-radius: 28px;
      background: rgba(255,255,255,.88);
      border: 1px solid rgba(35,74,116,.10);
      box-shadow: var(--shadow-sm);
    }
    .footer-grid{
      display:grid;
      grid-template-columns: 1.2fr .8fr .8fr;
      gap: 1rem;
    }
    .footer-brand{
      display:flex;
      flex-direction: column;
      gap: .75rem;
    }
    .footer-brand .brand{
      margin-bottom: .1rem;
    }
    .footer-brand p,
    .footer-col p{
      color: var(--muted);
      margin: 0;
      font-size: .94rem;
    }
    .footer-title{
      margin: 0 0 .65rem;
      font-size: 1rem;
      font-weight: 850;
    }
    .footer-links{
      list-style:none;
      padding:0;
      margin:0;
      display:grid;
      gap:.5rem;
    }
    .footer-links a{
      color: var(--muted);
      font-weight: 600;
    }
    .footer-links a:hover{
      color: var(--primary);
    }
    .footer-note{
      margin-top: 1rem;
      padding-top: .95rem;
      border-top: 1px solid rgba(35,74,116,.10);
      color: var(--muted);
      font-size: .86rem;
      display:flex;
      align-items:center;
      justify-content: space-between;
      gap: .75rem;
      flex-wrap: wrap;
    }

    .section-divider{
      height: 1px;
      background: linear-gradient(90deg, transparent, rgba(35,74,116,.12), transparent);
      margin: .6rem 0;
    }

    .badge-soft{
      display:inline-flex;
      align-items:center;
      gap:.35rem;
      padding:.38rem .6rem;
      border-radius:999px;
      background: rgba(47,111,179,.08);
      color: var(--primary);
      font-size:.8rem;
      font-weight:800;
      border:1px solid rgba(47,111,179,.08);
    }

    .mobile-only{
      display:none;
    }

    @media (max-width: 992px){
      .site-header .nav-wrap{
        flex-wrap: wrap;
      }
      .chip-nav{
        order: 3;
        width: 100%;
        padding-bottom: .2rem;
      }
      .header-cta{
        margin-left: auto;
      }
      .hero-grid,
      .updates-layout,
      .cta-grid,
      .footer-grid,
      .compare-grid,
      .topics-grid{
        grid-template-columns: 1fr;
      }
      .entry-grid{
        grid-template-columns: repeat(2, minmax(0,1fr));
      }
      .metric-grid{
        grid-template-columns: repeat(2, minmax(0,1fr));
      }
    }

    @media (max-width: 768px){
      .container-custom{
        width: min(100% - 1.2rem, var(--container));
      }
      .hero{
        padding-top: 1.25rem;
      }
      .hero-panel{
        border-radius: 24px;
      }
      .hero h1{
        font-size: clamp(1.8rem, 8vw, 2.55rem);
      }
      .section{
        padding: .8rem 0;
      }
      .section-head{
        margin-bottom: .85rem;
      }
      .entry-grid{
        grid-template-columns: 1fr;
      }
      .metric-grid{
        grid-template-columns: 1fr;
      }
      .header-cta{
        width: 100%;
      }
      .header-cta .btn{
        flex: 1 1 auto;
      }
      .site-header .nav-wrap{
        padding: .88rem 0;
      }
      .brand span{
        font-size: 1rem;
      }
      .footer-note{
        flex-direction: column;
        align-items: flex-start;
      }
      .form-actions .btn{
        width: 100%;
      }
    }

    @media (max-width: 520px){
      body{
        line-height: 1.68;
      }
      .hero-panel,
      .panel-card,
      .cta-shell,
      .footer-shell{
        padding: .95rem;
      }
      .hero-actions,
      .form-actions{
        display:grid;
        grid-template-columns: 1fr;
      }
      .hero-actions .btn,
      .form-actions .btn{
        width: 100%;
      }
      .chip{
        padding: .55rem .82rem;
        font-size: .9rem;
      }
      .topic-card,
      .compare-card,
      .aside-card,
      .faq-shell,
      .form-card{
        border-radius: 22px;
      }
      .update-card h3{
        font-size: 1rem;
      }
      .section-title{
        font-size: 1.35rem;
      }
    }

.lead-form{
      margin-top: 1rem;
    }
    .privacy-note{
      margin: .9rem 0 0;
      display:flex;
      align-items:flex-start;
      gap:.45rem;
      color: var(--muted);
      font-size: .86rem;
      line-height: 1.7;
    }
    .privacy-note i{
      color: var(--primary);
      margin-top: .15rem;
    }
    .last-section{
      padding-bottom: 1.4rem;
    }
    .quick-return{
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:1.2rem;
      padding: 1.25rem;
      border:1px solid rgba(35,74,116,.10);
      border-radius: var(--radius-lg);
      background: linear-gradient(135deg, rgba(255,255,255,.95), rgba(236,247,255,.92));
      box-shadow: var(--shadow-sm);
    }
    .quick-return h2{
      margin: .75rem 0 .35rem;
      font-size: clamp(1.25rem, 2vw, 1.65rem);
      font-weight: 900;
      letter-spacing: -.02em;
      color: var(--text);
    }
    .quick-return p{
      margin:0;
      color: var(--muted);
      max-width: 680px;
    }
    .quick-actions{
      display:flex;
      align-items:center;
      justify-content:flex-end;
      gap:.7rem;
      flex-wrap:wrap;
      min-width: 280px;
    }
    .footer-brand{
      margin-bottom: .8rem;
    }
    @media (max-width: 768px){
      .quick-return{
        align-items:flex-start;
        flex-direction:column;
        padding: 1rem;
      }
      .quick-actions{
        width:100%;
        min-width: 0;
        justify-content:flex-start;
      }
      .quick-actions .btn{
        width:100%;
      }
    }

/* roulang page: article */
:root{
      --bg: #f4f8fc;
      --bg-soft: #edf4fb;
      --surface: rgba(255,255,255,.88);
      --surface-solid: #ffffff;
      --surface-2: #f8fbff;
      --text: #17324d;
      --muted: #6c7f95;
      --line: rgba(35, 74, 116, .12);
      --line-2: rgba(35, 74, 116, .08);
      --primary: #2f6fb3;
      --primary-2: #4d8fd5;
      --primary-soft: rgba(47,111,179,.12);
      --accent: #69a9e8;
      --success: #1ea672;
      --warning: #e7a92f;
      --danger: #dc5b5b;
      --shadow-sm: 0 8px 24px rgba(34, 66, 99, .06);
      --shadow-md: 0 18px 44px rgba(34, 66, 99, .10);
      --shadow-lg: 0 28px 60px rgba(34, 66, 99, .16);
      --radius-sm: 14px;
      --radius: 18px;
      --radius-lg: 26px;
      --container: 1180px;
      --transition: 220ms cubic-bezier(.2,.7,.2,1);
    }

    *{ box-sizing: border-box; }
    html{
      scroll-behavior: smooth;
      scroll-padding-top: 90px;
    }
    body{
      margin: 0;
      color: var(--text);
      font-family: -apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",system-ui,sans-serif;
      line-height: 1.72;
      background:
        radial-gradient(circle at 10% 0%, rgba(77,143,213,.13), transparent 30%),
        radial-gradient(circle at 90% 10%, rgba(105,169,232,.12), transparent 24%),
        linear-gradient(180deg, #fbfdff 0%, var(--bg) 32%, #f7faff 100%);
      min-height: 100vh;
      text-rendering: optimizeLegibility;
      -webkit-font-smoothing: antialiased;
    }
    ::selection{ background: rgba(47,111,179,.16); color: var(--text); }
    img{ max-width: 100%; display: block; }
    a{
      color: inherit;
      text-decoration: none;
      transition: color var(--transition), background-color var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition), opacity var(--transition);
    }
    a:hover{ color: var(--primary); }
    a:focus-visible,
    button:focus-visible,
    .btn:focus-visible,
    .chip:focus-visible,
    input:focus-visible,
    textarea:focus-visible,
    .accordion-button:focus-visible{
      outline: 0;
      box-shadow: 0 0 0 4px rgba(47,111,179,.16);
    }
    button,
    .btn,
    input,
    textarea{
      font: inherit;
    }
    p{ margin-bottom: 0; }
    ul{ margin-bottom: 0; padding-left: 1.15rem; }
    hr{
      opacity: 1;
      border-color: var(--line);
      margin: 1rem 0;
    }
    .container-custom{
      width: min(100% - 2rem, var(--container));
      margin-inline: auto;
      position: relative;
      z-index: 1;
    }

    .site-header{
      position: sticky;
      top: 0;
      z-index: 1030;
      backdrop-filter: blur(18px);
      background: rgba(247, 250, 253, .82);
      border-bottom: 1px solid rgba(35, 74, 116, .08);
    }
    .site-header .nav-wrap{
      display: flex;
      align-items: center;
      gap: 1rem;
      padding: 1rem 0;
    }
    .brand{
      display: inline-flex;
      align-items: center;
      gap: .8rem;
      font-weight: 800;
      letter-spacing: .2px;
      color: var(--text);
      white-space: nowrap;
      flex: 0 0 auto;
    }
    .brand-mark{
      width: 42px;
      height: 42px;
      border-radius: 14px;
      display: grid;
      place-items: center;
      color: #fff;
      background: linear-gradient(145deg, var(--primary) 0%, var(--primary-2) 100%);
      box-shadow: 0 12px 24px rgba(47,111,179,.22);
      flex: 0 0 auto;
    }
    .brand-mark i{ font-size: 1.2rem; }
    .brand span{
      font-size: 1.06rem;
    }

    .chip-nav{
      display: flex;
      align-items: center;
      gap: .55rem;
      flex-wrap: nowrap;
      overflow-x: auto;
      overflow-y: hidden;
      scrollbar-width: none;
      -ms-overflow-style: none;
      padding: .25rem .15rem;
      margin-inline: auto;
      max-width: 100%;
    }
    .chip-nav::-webkit-scrollbar{ display: none; }
    .chip{
      display: inline-flex;
      align-items: center;
      gap: .45rem;
      padding: .62rem .95rem;
      border-radius: 999px;
      border: 1px solid transparent;
      color: var(--muted);
      background: transparent;
      font-size: .95rem;
      font-weight: 600;
      white-space: nowrap;
      transition: transform var(--transition), border-color var(--transition), background-color var(--transition), color var(--transition), box-shadow var(--transition), opacity var(--transition);
    }
    .chip:hover{
      background: rgba(255,255,255,.8);
      border-color: var(--line);
      color: var(--primary);
      box-shadow: 0 10px 24px rgba(34,66,99,.06);
      transform: translateY(-1px);
    }
    .chip.active{
      background: linear-gradient(180deg, rgba(47,111,179,.14), rgba(47,111,179,.08));
      border-color: rgba(47,111,179,.16);
      color: var(--primary);
      box-shadow: inset 0 0 0 1px rgba(47,111,179,.04);
    }
    .header-cta{
      display: inline-flex;
      align-items: center;
      gap: .5rem;
      flex: 0 0 auto;
    }

    .btn{
      border-radius: 999px;
      padding: .8rem 1.15rem;
      font-weight: 700;
      border: 1px solid transparent;
      transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition), border-color var(--transition), color var(--transition), opacity var(--transition), filter var(--transition);
    }
    .btn:hover{ transform: translateY(-1px); }
    .btn:active{ transform: translateY(0); }
    .btn-primary{
      border: 1px solid rgba(47,111,179,.12);
      background: linear-gradient(180deg, var(--primary-2), var(--primary));
      color: #fff;
      box-shadow: 0 14px 28px rgba(47,111,179,.22);
    }
    .btn-primary:hover{
      color: #fff;
      box-shadow: 0 18px 36px rgba(47,111,179,.30);
      filter: saturate(1.03);
    }
    .btn-outline-primary{
      border: 1px solid rgba(47,111,179,.22);
      color: var(--primary);
      background: rgba(255,255,255,.75);
      box-shadow: 0 10px 18px rgba(34,66,99,.05);
    }
    .btn-outline-primary:hover{
      background: rgba(47,111,179,.08);
      color: var(--primary);
      border-color: rgba(47,111,179,.28);
    }
    .btn-lightish{
      background: rgba(255,255,255,.82);
      color: var(--text);
      border: 1px solid rgba(35,74,116,.10);
      box-shadow: 0 10px 18px rgba(34,66,99,.05);
    }
    .btn-lightish:hover{
      background: #fff;
      border-color: rgba(47,111,179,.16);
      color: var(--primary);
    }
    .btn-soft{
      background: var(--primary-soft);
      border-color: transparent;
      color: var(--primary);
    }
    .btn-soft:hover{
      background: rgba(47,111,179,.16);
      color: var(--primary);
    }

    .page-main{
      padding: 1.2rem 0 2.8rem;
    }
    .hero{
      padding: .2rem 0 1rem;
    }
    .hero-panel{
      position: relative;
      overflow: hidden;
      border: 1px solid rgba(35,74,116,.10);
      background: linear-gradient(135deg, rgba(255,255,255,.92) 0%, rgba(244,248,252,.95) 100%);
      border-radius: 30px;
      box-shadow: var(--shadow-lg);
      padding: clamp(1.2rem, 3vw, 2rem);
    }
    .hero-panel::before,
    .hero-panel::after{
      content: "";
      position: absolute;
      border-radius: 999px;
      pointer-events: none;
      filter: blur(1px);
    }
    .hero-panel::before{
      width: 210px;
      height: 210px;
      right: -70px;
      top: -72px;
      background: radial-gradient(circle, rgba(77,143,213,.15), transparent 62%);
    }
    .hero-panel::after{
      width: 150px;
      height: 150px;
      left: -46px;
      bottom: -60px;
      background: radial-gradient(circle, rgba(105,169,232,.14), transparent 62%);
    }
    .hero-grid{
      display: grid;
      grid-template-columns: minmax(0, 1.25fr) minmax(300px, .85fr);
      gap: 1.2rem;
      align-items: start;
      position: relative;
      z-index: 1;
    }
    .hero-badge-row{
      display: flex;
      flex-wrap: wrap;
      gap: .55rem;
      margin-bottom: .95rem;
    }
    .badge-soft,
    .pill{
      display: inline-flex;
      align-items: center;
      gap: .42rem;
      padding: .42rem .75rem;
      border-radius: 999px;
      background: rgba(47,111,179,.08);
      color: var(--primary);
      border: 1px solid rgba(47,111,179,.12);
      font-size: .88rem;
      font-weight: 700;
      letter-spacing: .1px;
      white-space: nowrap;
    }
    .badge-soft i,
    .pill i{
      font-size: .9rem;
    }
    .section-kicker{
      display: inline-flex;
      align-items: center;
      gap: .5rem;
      color: var(--primary);
      font-weight: 800;
      margin-bottom: .65rem;
    }
    .section-kicker::before{
      content: "";
      width: 14px;
      height: 14px;
      border-radius: 50%;
      background: linear-gradient(145deg, var(--primary-2), var(--accent));
      box-shadow: 0 8px 18px rgba(47,111,179,.2);
    }
    .hero-title{
      margin: 0;
      font-weight: 900;
      line-height: 1.12;
      letter-spacing: -.02em;
      font-size: clamp(1.9rem, 3.6vw, 3.2rem);
      color: var(--text);
    }
    .hero-subtitle{
      margin-top: .95rem;
      max-width: 62ch;
      color: var(--muted);
      font-size: 1.02rem;
    }
    .hero-actions{
      display: flex;
      flex-wrap: wrap;
      gap: .7rem;
      margin-top: 1.25rem;
    }

    .meta-grid{
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: .85rem;
    }
    .metric-card,
    .info-card,
    .side-card,
    .reading-card,
    .compare-card,
    .update-card,
    .faq-card,
    .cta-card,
    .not-found-card{
      background: var(--surface);
      border: 1px solid rgba(35,74,116,.10);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
      backdrop-filter: blur(12px);
    }
    .metric-card{
      padding: 1rem;
      transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    }
    .metric-card:hover{
      transform: translateY(-2px);
      box-shadow: var(--shadow-md);
      border-color: rgba(47,111,179,.18);
    }
    .metric-label{
      color: var(--muted);
      font-size: .9rem;
      display: flex;
      align-items: center;
      gap: .45rem;
      margin-bottom: .55rem;
    }
    .metric-label i{ color: var(--primary); }
    .metric-value{
      font-size: 1.24rem;
      font-weight: 900;
      line-height: 1.3;
      letter-spacing: -.01em;
      color: var(--text);
    }
    .metric-desc{
      margin-top: .4rem;
      color: var(--muted);
      font-size: .92rem;
    }
    .trend{
      display: inline-flex;
      align-items: center;
      gap: .3rem;
      margin-top: .55rem;
      color: var(--success);
      font-size: .84rem;
      font-weight: 700;
    }

    .section-shell{
      padding: 1.15rem 0 0;
    }
    .section-head{
      display: flex;
      align-items: end;
      justify-content: space-between;
      gap: 1rem;
      margin-bottom: 1rem;
    }
    .section-title{
      margin: 0;
      font-weight: 900;
      letter-spacing: -.02em;
      font-size: clamp(1.25rem, 1.7vw, 1.65rem);
      color: var(--text);
    }
    .section-desc{
      color: var(--muted);
      max-width: 64ch;
      margin-top: .45rem;
    }
    .section-action{
      flex: 0 0 auto;
    }

    .content-grid{
      display: grid;
      grid-template-columns: minmax(0, 1.35fr) minmax(280px, .65fr);
      gap: 1rem;
      align-items: start;
    }
    .reading-card{
      padding: clamp(1.1rem, 2vw, 1.4rem);
    }
    .article-topline{
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: .55rem;
      margin-bottom: .9rem;
    }
    .article-topline .muted{
      color: var(--muted);
      font-size: .92rem;
    }
    .article-topline .dot{
      width: 5px;
      height: 5px;
      border-radius: 50%;
      background: rgba(108,127,149,.55);
    }
    .article-body{
      max-width: 760px;
      color: var(--text);
      font-size: 1.02rem;
      line-height: 1.9;
    }
    .article-body > * + *{ margin-top: 1rem; }
    .article-body h1,
    .article-body h2,
    .article-body h3,
    .article-body h4{
      color: var(--text);
      line-height: 1.35;
      font-weight: 800;
      margin-top: 1.5rem;
      margin-bottom: .8rem;
      letter-spacing: -.01em;
    }
    .article-body h2{
      font-size: 1.35rem;
      padding-left: .7rem;
      border-left: 4px solid rgba(47,111,179,.22);
    }
    .article-body h3{ font-size: 1.15rem; }
    .article-body p{
      margin: 0;
      color: var(--text);
    }
    .article-body a{
      color: var(--primary);
      text-decoration: none;
      border-bottom: 1px solid rgba(47,111,179,.22);
    }
    .article-body a:hover{
      color: var(--primary-2);
      border-bottom-color: rgba(47,111,179,.42);
    }
    .article-body ul,
    .article-body ol{
      padding-left: 1.3rem;
      margin: .3rem 0 0;
    }
    .article-body li + li{ margin-top: .35rem; }
    .article-body blockquote{
      margin: 1.2rem 0;
      padding: 1rem 1.1rem;
      border-left: 4px solid rgba(47,111,179,.22);
      background: rgba(47,111,179,.06);
      border-radius: 0 var(--radius) var(--radius) 0;
      color: #33526f;
    }
    .article-body img{
      margin: 1rem 0;
      border-radius: 18px;
      box-shadow: var(--shadow-sm);
    }
    .article-body figure{
      margin: 1rem 0;
    }
    .article-body figcaption{
      color: var(--muted);
      font-size: .9rem;
      text-align: center;
      margin-top: .45rem;
    }
    .article-body table{
      width: 100%;
      border-collapse: separate;
      border-spacing: 0;
      margin: 1rem 0;
      overflow: hidden;
      border-radius: 18px;
      border: 1px solid rgba(35,74,116,.10);
      background: #fff;
      box-shadow: var(--shadow-sm);
      display: block;
      overflow-x: auto;
      white-space: nowrap;
    }
    .article-body th,
    .article-body td{
      padding: .85rem 1rem;
      border-bottom: 1px solid rgba(35,74,116,.08);
      text-align: left;
    }
    .article-body th{
      background: #f5f9fe;
      color: var(--text);
      font-weight: 800;
    }
    .article-body code{
      padding: .18rem .42rem;
      border-radius: 8px;
      background: rgba(47,111,179,.08);
      color: var(--primary);
      font-size: .92em;
    }
    .article-body pre{
      margin: 1rem 0;
      padding: 1rem 1.1rem;
      border-radius: 18px;
      background: #0f2438;
      color: #e8f2ff;
      overflow: auto;
      box-shadow: var(--shadow-sm);
    }
    .article-body pre code{
      background: transparent;
      color: inherit;
      padding: 0;
    }
    .article-body hr{
      margin: 1.3rem 0;
    }

    .side-stack{
      display: grid;
      gap: 1rem;
      position: sticky;
      top: 92px;
    }
    .side-card{
      padding: 1rem;
    }
    .side-title{
      display: flex;
      align-items: center;
      gap: .5rem;
      margin-bottom: .9rem;
      font-size: 1.02rem;
      font-weight: 800;
      color: var(--text);
    }
    .side-title i{
      color: var(--primary);
    }
    .info-list{
      display: grid;
      gap: .72rem;
      list-style: none;
      padding: 0;
      margin: 0;
    }
    .info-list li{
      display: flex;
      align-items: flex-start;
      justify-content: space-between;
      gap: .8rem;
      color: var(--muted);
      font-size: .96rem;
      padding-bottom: .72rem;
      border-bottom: 1px dashed rgba(35,74,116,.12);
    }
    .info-list li:last-child{
      padding-bottom: 0;
      border-bottom: 0;
    }
    .info-list strong{
      color: var(--text);
      font-weight: 800;
      flex: 0 0 auto;
    }
    .jump-list{
      display: flex;
      flex-wrap: wrap;
      gap: .55rem;
    }
    .jump-link{
      display: inline-flex;
      align-items: center;
      gap: .42rem;
      padding: .58rem .8rem;
      border-radius: 999px;
      background: #f7fbff;
      border: 1px solid rgba(35,74,116,.10);
      color: var(--text);
      font-size: .92rem;
      font-weight: 700;
    }
    .jump-link:hover{
      background: rgba(47,111,179,.08);
      border-color: rgba(47,111,179,.16);
      color: var(--primary);
    }

    .compare-grid{
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 1rem;
    }
    .compare-card{
      padding: 1rem;
      position: relative;
      overflow: hidden;
    }
    .compare-card::after{
      content: "";
      position: absolute;
      inset: auto -18px -18px auto;
      width: 110px;
      height: 110px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(77,143,213,.12), transparent 68%);
      pointer-events: none;
    }
    .compare-label{
      display: flex;
      align-items: center;
      gap: .45rem;
      color: var(--muted);
      font-size: .9rem;
      margin-bottom: .6rem;
    }
    .compare-label i{
      color: var(--primary);
    }
    .compare-title{
      font-size: 1.05rem;
      font-weight: 800;
      margin-bottom: .45rem;
      color: var(--text);
    }
    .compare-text{
      color: var(--muted);
      font-size: .95rem;
    }
    .bar{
      height: 10px;
      border-radius: 999px;
      background: #e8eef6;
      overflow: hidden;
      margin-top: .95rem;
      box-shadow: inset 0 1px 2px rgba(0,0,0,.05);
    }
    .bar > span{
      display: block;
      height: 100%;
      border-radius: inherit;
      background: linear-gradient(90deg, var(--primary-2), var(--primary));
    }
    .compare-foot{
      margin-top: .55rem;
      font-size: .9rem;
      color: var(--muted);
      display: flex;
      justify-content: space-between;
      gap: .75rem;
    }

    .updates-grid{
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 1rem;
    }
    .update-card{
      padding: 1rem;
      transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    }
    .update-card:hover{
      transform: translateY(-2px);
      box-shadow: var(--shadow-md);
      border-color: rgba(47,111,179,.18);
    }
    .update-top{
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: .8rem;
      margin-bottom: .75rem;
    }
    .update-icon{
      width: 42px;
      height: 42px;
      border-radius: 14px;
      display: grid;
      place-items: center;
      background: linear-gradient(180deg, rgba(47,111,179,.12), rgba(47,111,179,.06));
      color: var(--primary);
      flex: 0 0 auto;
    }
    .update-date{
      color: var(--muted);
      font-size: .9rem;
      white-space: nowrap;
    }
    .update-title{
      font-size: 1.08rem;
      font-weight: 800;
      margin-bottom: .45rem;
      color: var(--text);
    }
    .update-text{
      color: var(--muted);
      font-size: .95rem;
      min-height: 3.7em;
    }
    .update-link{
      display: inline-flex;
      align-items: center;
      gap: .35rem;
      margin-top: .9rem;
      color: var(--primary);
      font-weight: 800;
      font-size: .95rem;
    }
    .update-link:hover{
      color: var(--primary-2);
    }

    .faq-wrap{
      display: grid;
      gap: .9rem;
    }
    .faq-card{
      padding: .2rem;
      overflow: hidden;
    }
    .accordion{
      --bs-accordion-bg: transparent;
      --bs-accordion-border-color: transparent;
      --bs-accordion-color: var(--text);
      --bs-accordion-btn-color: var(--text);
      --bs-accordion-btn-bg: transparent;
      --bs-accordion-btn-focus-box-shadow: none;
      --bs-accordion-active-color: var(--text);
      --bs-accordion-active-bg: transparent;
      --bs-accordion-body-padding-x: 1rem;
      --bs-accordion-body-padding-y: 0 1rem 1rem;
      --bs-accordion-btn-padding-x: 1rem;
      --bs-accordion-btn-padding-y: 1rem;
    }
    .accordion-item{
      border: 0;
      background: transparent;
    }
    .accordion-item + .accordion-item{
      margin-top: .55rem;
    }
    .accordion-button{
      border-radius: 18px !important;
      font-weight: 800;
      box-shadow: none !important;
      background: #f8fbff;
      border: 1px solid rgba(35,74,116,.10);
      color: var(--text);
      transition: background-color var(--transition), border-color var(--transition), transform var(--transition);
    }
    .accordion-button:not(.collapsed){
      background: linear-gradient(180deg, rgba(47,111,179,.08), rgba(47,111,179,.05));
      border-color: rgba(47,111,179,.16);
      color: var(--primary);
    }
    .accordion-button::after{
      background-size: 1rem;
      opacity: .72;
    }
    .accordion-body{
      color: var(--muted);
      padding-top: .85rem;
      line-height: 1.85;
    }

    .cta-card{
      padding: clamp(1.1rem, 2vw, 1.5rem);
      position: relative;
      overflow: hidden;
      background:
        radial-gradient(circle at 10% 0%, rgba(77,143,213,.10), transparent 28%),
        radial-gradient(circle at 90% 20%, rgba(105,169,232,.10), transparent 24%),
        linear-gradient(180deg, rgba(255,255,255,.95), rgba(246,250,254,.96));
    }
    .cta-inner{
      display: grid;
      grid-template-columns: minmax(0, 1.05fr) minmax(300px, .95fr);
      gap: 1rem;
      align-items: start;
    }
    .cta-title{
      margin: 0;
      font-size: clamp(1.35rem, 2vw, 1.8rem);
      font-weight: 900;
      color: var(--text);
      letter-spacing: -.02em;
    }
    .cta-text{
      margin-top: .65rem;
      color: var(--muted);
      max-width: 60ch;
    }
    .cta-points{
      display: grid;
      gap: .55rem;
      margin-top: 1rem;
      list-style: none;
      padding: 0;
    }
    .cta-points li{
      display: flex;
      align-items: center;
      gap: .55rem;
      color: var(--text);
      font-size: .95rem;
    }
    .cta-points i{
      color: var(--success);
    }
    .form-shell{
      background: rgba(255,255,255,.82);
      border: 1px solid rgba(35,74,116,.10);
      border-radius: 22px;
      padding: 1rem;
      box-shadow: var(--shadow-sm);
    }
    .form-label{
      font-weight: 700;
      color: var(--text);
      margin-bottom: .45rem;
    }
    .form-control,
    .form-select{
      border-radius: 16px;
      border: 1px solid rgba(35,74,116,.14);
      background-color: rgba(255,255,255,.96);
      padding: .82rem 1rem;
      color: var(--text);
      transition: border-color var(--transition), box-shadow var(--transition), background-color var(--transition), transform var(--transition);
    }
    .form-control::placeholder{
      color: #91a2b7;
    }
    .form-control:focus,
    .form-select:focus{
      border-color: rgba(47,111,179,.34);
      box-shadow: 0 0 0 4px rgba(47,111,179,.14);
      background: #fff;
    }
    textarea.form-control{
      min-height: 118px;
      resize: vertical;
    }
    .form-help{
      margin-top: .45rem;
      color: var(--muted);
      font-size: .88rem;
    }
    .form-actions{
      display: flex;
      flex-wrap: wrap;
      gap: .7rem;
      margin-top: 1rem;
    }

    .site-footer{
      margin-top: 2.6rem;
      padding: 2rem 0 1.1rem;
    }
    .footer-shell{
      background: rgba(255,255,255,.8);
      border: 1px solid rgba(35,74,116,.10);
      border-radius: 30px;
      box-shadow: var(--shadow-sm);
      padding: 1.3rem;
    }
    .footer-grid{
      display: grid;
      grid-template-columns: 1.2fr .7fr .7fr;
      gap: 1rem;
      align-items: start;
    }
    .footer-brand{
      margin-bottom: .8rem;
    }
    .footer-text{
      color: var(--muted);
      max-width: 42ch;
    }
    .footer-title{
      margin: .15rem 0 .9rem;
      font-size: 1rem;
      font-weight: 800;
      color: var(--text);
    }
    .footer-links{
      list-style: none;
      padding: 0;
      margin: 0;
      display: grid;
      gap: .55rem;
    }
    .footer-links a{
      color: var(--muted);
      display: inline-flex;
      align-items: center;
      gap: .35rem;
      padding: .16rem 0;
    }
    .footer-links a:hover{
      color: var(--primary);
    }
    .footer-note{
      display: flex;
      justify-content: space-between;
      gap: .75rem;
      flex-wrap: wrap;
      margin-top: 1rem;
      padding-top: 1rem;
      border-top: 1px solid rgba(35,74,116,.10);
      color: var(--muted);
      font-size: .9rem;
    }

    .not-found-shell{
      min-height: calc(100vh - 240px);
      display: grid;
      place-items: center;
      padding: 2rem 0 3rem;
    }
    .not-found-card{
      width: min(100%, 680px);
      padding: clamp(1.2rem, 2.4vw, 1.8rem);
      text-align: center;
    }
    .not-found-title{
      margin: 0;
      font-size: clamp(1.5rem, 2vw, 2rem);
      font-weight: 900;
      color: var(--text);
      letter-spacing: -.02em;
    }
    .not-found-text{
      margin-top: .7rem;
      color: var(--muted);
    }
    .not-found-actions{
      margin-top: 1.1rem;
      display: flex;
      justify-content: center;
      gap: .7rem;
      flex-wrap: wrap;
    }

    .sticky-top-soft{
      position: sticky;
      top: 92px;
    }

    @media (max-width: 1199.98px){
      .hero-grid,
      .cta-inner{
        grid-template-columns: 1fr;
      }
      .content-grid{
        grid-template-columns: 1fr;
      }
      .side-stack{
        position: static;
      }
    }
    @media (max-width: 991.98px){
      .site-header .nav-wrap{
        flex-wrap: wrap;
      }
      .chip-nav{
        order: 3;
        width: 100%;
        margin-inline: 0;
      }
      .header-cta{
        margin-left: auto;
      }
      .meta-grid,
      .compare-grid,
      .updates-grid{
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }
      .footer-grid{
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 767.98px){
      .page-main{
        padding-top: .9rem;
      }
      .hero-panel{
        border-radius: 26px;
      }
      .section-head{
        align-items: start;
        flex-direction: column;
      }
      .meta-grid,
      .compare-grid,
      .updates-grid{
        grid-template-columns: 1fr;
      }
      .hero-actions,
      .form-actions,
      .not-found-actions{
        flex-direction: column;
      }
      .hero-actions .btn,
      .form-actions .btn,
      .not-found-actions .btn{
        width: 100%;
        justify-content: center;
      }
      .footer-shell{
        padding: 1.1rem;
      }
      .footer-note{
        flex-direction: column;
      }
    }
    @media (max-width: 575.98px){
      .container-custom{
        width: min(100% - 1.2rem, var(--container));
      }
      .site-header .nav-wrap{
        gap: .75rem;
      }
      .brand span{
        font-size: 1rem;
      }
      .brand-mark{
        width: 38px;
        height: 38px;
        border-radius: 13px;
      }
      .chip{
        padding: .55rem .82rem;
        font-size: .9rem;
      }
      .hero-title{
        font-size: 1.8rem;
      }
      .hero-subtitle,
      .section-desc,
      .article-body{
        font-size: .98rem;
      }
      .reading-card,
      .side-card,
      .compare-card,
      .update-card,
      .cta-card,
      .not-found-card,
      .footer-shell{
        border-radius: 22px;
      }
      .accordion-button{
        border-radius: 16px !important;
      }
      .form-control,
      .form-select{
        border-radius: 14px;
      }
    }

/* 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}