/* roulang page: index */
:root{
    --brand-700:#17527A;
    --brand-600:#1D6A9C;
    --brand-100:#E7F0F7;
    --brand-900:#0F3A55;
    --accent-500:#E08A3C;
    --ink-900:#14212E;
    --ink-700:#3C4E5F;
    --ink-500:#6B7C8C;
    --line:#E3EAF0;
    --bg:#F7F9FB;
    --card:#FFFFFF;
    --r-card:14px;
    --r-block:18px;
    --r-btn:10px;
    --shadow-1:0 1px 2px rgba(16,42,67,.06), 0 8px 24px rgba(16,42,67,.05);
    --shadow-2:0 2px 4px rgba(16,42,67,.08), 0 14px 32px rgba(16,42,67,.10);
    --ease:cubic-bezier(.2,.7,.3,1);
  }
  *,*::before,*::after{box-sizing:border-box}
  html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
  body{
    margin:0;
    background:var(--bg);
    color:var(--ink-700);
    font-family:system-ui,-apple-system,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",sans-serif;
    font-size:16px;
    line-height:1.75;
    -webkit-font-smoothing:antialiased;
  }
  img{display:block;max-width:100%;height:auto}
  a{color:inherit;text-decoration:none}
  button,input,textarea{font:inherit;color:inherit}
  button{cursor:pointer;background:none;border:0}
  h1,h2,h3,h4,p{margin:0}
  ul{margin:0;padding:0;list-style:none}
  .num{font-variant-numeric:tabular-nums;font-feature-settings:"tnum"}

  .wrap{max-width:1200px;margin:0 auto;padding:0 32px;width:100%}
  @media (max-width:1023px){.wrap{padding:0 24px}}
  @media (max-width:520px){.wrap{padding:0 20px}}

  .section{padding:96px 0}
  .section--tight{padding:72px 0}
  .section--alt{background:#FFFFFF}
  @media (max-width:1023px){.section{padding:72px 0}.section--tight{padding:56px 0}}
  @media (max-width:520px){.section{padding:56px 0}.section--tight{padding:44px 0}}

  /* ---------- header ---------- */
  .site-head{
    position:sticky;top:0;z-index:60;background:#fff;
    border-bottom:1px solid var(--line);
  }
  .head-inner{display:flex;align-items:center;justify-content:space-between;height:72px;gap:28px}
  .logo{display:flex;align-items:center;gap:10px;font-size:19px;font-weight:700;color:var(--ink-900);letter-spacing:.01em}
  .logo-mark{
    width:20px;height:20px;border-radius:5px;background:var(--brand-700);position:relative;flex:none;
  }
  .logo-mark::after{
    content:"";position:absolute;left:5px;top:5px;width:10px;height:10px;
    border-left:2px solid #fff;border-bottom:2px solid #fff;
  }
  .nav-links{display:flex;align-items:center;gap:30px}
  .nav-link{
    position:relative;font-size:15px;letter-spacing:.02em;color:var(--ink-700);
    padding:6px 0;transition:color .2s var(--ease);white-space:nowrap;
  }
  .nav-link::after{
    content:"";position:absolute;left:0;right:0;bottom:-16px;height:2px;
    background:var(--brand-700);opacity:0;transition:opacity .2s var(--ease);
  }
  .nav-link:hover{color:var(--brand-700)}
  .nav-link.is-active{color:var(--brand-700);font-weight:600}
  .nav-link.is-active::after{opacity:1}
  .nav-cta{
    display:inline-flex;align-items:center;height:38px;padding:0 18px;border-radius:var(--r-btn);
    background:var(--brand-700);color:#fff;font-size:14px;font-weight:600;
    transition:background .2s var(--ease),transform .2s var(--ease);
  }
  .nav-cta:hover{background:var(--brand-600);transform:translateY(-1px)}
  .nav-toggle{
    display:none;width:40px;height:40px;border:1px solid var(--line);border-radius:10px;
    align-items:center;justify-content:center;color:var(--ink-900);
  }
  .nav-toggle span{display:block;width:16px;height:1.5px;background:currentColor;position:relative}
  .nav-toggle span::before,.nav-toggle span::after{
    content:"";position:absolute;left:0;width:16px;height:1.5px;background:currentColor;
  }
  .nav-toggle span::before{top:-5px}
  .nav-toggle span::after{top:5px}
  .mobile-panel{
    display:none;border-top:1px solid var(--line);background:#fff;
  }
  .mobile-panel.is-open{display:block}
  .mobile-panel a{
    display:block;padding:16px 0;border-bottom:1px solid var(--line);
    font-size:16px;color:var(--ink-700);
  }
  .mobile-panel a:last-child{border-bottom:0}
  .mobile-panel a.is-active{color:var(--brand-700);font-weight:600}
  @media (max-width:1023px){
    .nav-links,.nav-cta{display:none}
    .nav-toggle{display:flex}
    .head-inner{height:60px}
  }

  /* ---------- buttons ---------- */
  .btn{
    display:inline-flex;align-items:center;justify-content:center;gap:8px;
    height:46px;padding:0 24px;border-radius:var(--r-btn);font-size:15px;font-weight:600;
    transition:all .2s var(--ease);white-space:nowrap;
  }
  .btn-primary{background:var(--brand-700);color:#fff}
  .btn-primary:hover{background:var(--brand-600);transform:translateY(-2px);box-shadow:var(--shadow-2)}
  .btn-accent{background:var(--accent-500);color:#fff}
  .btn-accent:hover{background:#cf7a2c;transform:translateY(-2px);box-shadow:0 10px 24px rgba(224,138,60,.28)}
  .btn-ghost{background:#fff;color:var(--ink-900);border:1px solid var(--line)}
  .btn-ghost:hover{border-color:var(--brand-700);background:var(--brand-100);color:var(--brand-700)}
  .btn-onDark{background:#fff;color:var(--brand-900);border:1px solid rgba(255,255,255,.5)}
  .btn-onDark:hover{background:transparent;color:#fff}
  .btn:focus-visible,.nav-cta:focus-visible,.nav-link:focus-visible,.nav-toggle:focus-visible,
  .thumb:focus-visible,.faq-q:focus-visible,.tablink:focus-visible,.card-link:focus-visible{
    outline:2px solid var(--brand-700);outline-offset:2px;
  }
  .text-link{
    display:inline-flex;align-items:center;gap:6px;color:var(--brand-700);
    font-size:14px;font-weight:600;
  }
  .text-link .arrow{transition:transform .2s var(--ease)}
  .text-link:hover .arrow{transform:translateX(3px)}

  /* ---------- badge ---------- */
  .badge{
    display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:999px;
    background:var(--brand-100);color:var(--brand-700);font-size:12.5px;font-weight:600;
    letter-spacing:.01em;white-space:nowrap;
  }
  .badge--soft{background:#fff;border:1px solid var(--line);color:var(--ink-500)}
  .badge--dark{background:rgba(255,255,255,.14);color:#fff}

  /* ---------- titles ---------- */
  .h1{
    font-size:clamp(1.75rem,4vw,2.75rem);line-height:1.28;font-weight:700;color:var(--ink-900);
    letter-spacing:-.01em;
  }
  .h2{
    font-size:clamp(1.375rem,2.6vw,1.875rem);line-height:1.35;font-weight:700;color:var(--ink-900);
    position:relative;padding-left:16px;
  }
  .h2::before{
    content:"";position:absolute;left:0;top:.28em;bottom:.28em;width:4px;border-radius:2px;
    background:var(--brand-700);
  }
  .h3{font-size:1.125rem;font-weight:600;color:var(--ink-900);line-height:1.5}
  .lead{font-size:17px;color:var(--ink-700);line-height:1.8}
  .muted{color:var(--ink-500);font-size:14px}
  .section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:36px}
  @media (max-width:640px){.section-head{flex-direction:column;align-items:flex-start;gap:12px;margin-bottom:24px}}

  /* ---------- hero ---------- */
  .hero{padding:64px 0 80px;background:#fff;border-bottom:1px solid var(--line)}
  .hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center;min-height:560px}
  .hero-trust{
    display:flex;flex-wrap:wrap;gap:0;margin-top:32px;border-top:1px solid var(--line);padding-top:20px;
  }
  .hero-trust div{
    flex:1 1 0;min-width:120px;padding-right:18px;font-size:13.5px;color:var(--ink-500);
    border-right:1px solid var(--line);
  }
  .hero-trust div:last-child{border-right:0;padding-right:0;padding-left:18px}
  .hero-trust div:first-child{padding-left:0}
  .hero-trust strong{display:block;color:var(--ink-900);font-size:14.5px;font-weight:600;margin-bottom:2px}
  .hero-art{position:relative}
  .hero-art-bg{
    width:100%;aspect-ratio:4/3;border-radius:var(--r-block);overflow:hidden;
    background-image:url('/assets/images/backpic/back-1.png');
    background-size:cover;background-position:center;position:relative;
  }
  .hero-art-bg::after{
    content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(247,249,251,.14),rgba(15,58,85,.16));
  }
  .hero-float{
    position:absolute;left:-26px;bottom:-30px;width:56%;border-radius:var(--r-card);overflow:hidden;
    box-shadow:var(--shadow-2);transform:rotate(-3deg);border:4px solid #fff;background:#fff;
  }
  .hero-float img{width:100%;aspect-ratio:16/10;object-fit:cover}
  @media (max-width:1023px){
    .hero{padding:44px 0 56px}
    .hero-grid{grid-template-columns:1fr;gap:40px;min-height:0}
    .hero-float{left:auto;right:-10px;bottom:-24px;width:52%}
  }
  @media (max-width:520px){
    .hero-float{position:static;width:100%;transform:none;margin-top:16px;border-width:0;box-shadow:var(--shadow-1)}
    .hero-trust div{flex:1 1 100%;border-right:0;padding:10px 0;border-bottom:1px solid var(--line)}
    .hero-trust div:last-child{border-bottom:0;padding-left:0}
    .btn{width:100%}
  }

  /* ---------- value strip ---------- */
  .value-strip{
    display:grid;grid-template-columns:repeat(3,1fr);
  }
  .value-item{padding:0 32px;border-right:1px solid var(--line)}
  .value-item:first-child{padding-left:0}
  .value-item:last-child{border-right:0;padding-right:0}
  .value-ico{
    width:38px;height:38px;border-radius:10px;background:var(--brand-100);color:var(--brand-700);
    display:flex;align-items:center;justify-content:center;margin-bottom:14px;
  }
  @media (max-width:767px){
    .value-strip{grid-template-columns:1fr}
    .value-item{padding:20px 0;border-right:0;border-bottom:1px solid var(--line)}
    .value-item:last-child{border-bottom:0}
  }

  /* ---------- slider ---------- */
  .slider-stage{position:relative;border-radius:var(--r-block);overflow:hidden;background:var(--brand-100);box-shadow:var(--shadow-1)}
  .slide{display:none;animation:fade .45s var(--ease)}
  .slide.is-active{display:block}
  .slide img{width:100%;aspect-ratio:16/10;object-fit:cover}
  .slide-cap{
    position:absolute;left:20px;bottom:20px;background:rgba(255,255,255,.94);
    border-radius:999px;padding:7px 16px;font-size:13.5px;font-weight:600;color:var(--ink-900);
  }
  @keyframes fade{from{opacity:0}to{opacity:1}}
  .thumb-row{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:16px}
  .thumb{
    border-radius:10px;overflow:hidden;border:1px solid var(--line);background:#fff;
    opacity:.62;transition:all .2s var(--ease);padding:0;
  }
  .thumb img{width:100%;aspect-ratio:16/10;object-fit:cover}
  .thumb:hover{opacity:1}
  .thumb.is-active{opacity:1;border-color:var(--brand-700);box-shadow:var(--shadow-1)}
  .indicator{display:flex;gap:8px;margin-top:18px;align-items:center}
  .indicator button{height:3px;flex:1;background:var(--line);border-radius:2px;transition:all .25s var(--ease)}
  .indicator button.is-active{background:var(--brand-700);flex:0 0 32px}
  @media (max-width:520px){
    .thumb-row{display:none}
    .indicator button{height:6px;flex:1;border-radius:999px}
    .indicator button.is-active{flex:0 0 22px}
    .slide-cap{left:12px;bottom:12px;font-size:12.5px;padding:6px 12px}
  }

  /* ---------- spec cards ---------- */
  .spec-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
  .spec-card{
    background:#fff;border:1px solid var(--line);border-radius:var(--r-card);padding:28px;
  }
  .spec-card--rec{border-color:var(--brand-700);box-shadow:var(--shadow-1)}
  .spec-row{
    display:flex;justify-content:space-between;gap:18px;padding:12px 0;
    border-bottom:1px dashed var(--line);font-size:14.5px;
  }
  .spec-row:last-child{border-bottom:0}
  .spec-row span:first-child{color:var(--ink-500)}
  .spec-row span:last-child{color:var(--ink-900);font-weight:600;text-align:right}
  @media (max-width:767px){.spec-grid{grid-template-columns:1fr}}

  /* ---------- cards ---------- */
  .card{
    background:#fff;border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden;
    transition:transform .2s var(--ease),box-shadow .2s var(--ease),border-color .2s var(--ease);
    display:flex;flex-direction:column;height:100%;
  }
  .card:hover{transform:translateY(-2px);box-shadow:var(--shadow-2);border-color:#D3E0EA}
  .card-media img{width:100%;aspect-ratio:16/10;object-fit:cover}
  .card-body{padding:22px 24px 24px;display:flex;flex-direction:column;gap:10px;flex:1}
  .card-title{font-size:17px;font-weight:600;color:var(--ink-900);line-height:1.5}
  .card-text{font-size:14.5px;color:var(--ink-700);line-height:1.75}
  .card-foot{margin-top:auto;padding-top:14px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:12px}
  .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
  .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
  .grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
  @media (max-width:1023px){.grid-4{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(2,1fr)}}
  @media (max-width:640px){.grid-4,.grid-3,.grid-2{grid-template-columns:1fr;gap:16px}}

  /* ---------- reviews ---------- */
  .review-wall{column-count:3;column-gap:24px}
  .review{
    break-inside:avoid;background:#fff;border:1px solid var(--line);border-radius:var(--r-card);
    padding:24px;margin-bottom:24px;
  }
  .review-quote{font-size:14.5px;color:var(--ink-700);line-height:1.8;margin:14px 0 18px}
  .review-person{display:flex;align-items:center;gap:12px;padding-top:16px;border-top:1px solid var(--line)}
  .review-person img{width:40px;height:40px;border-radius:50%;object-fit:cover;flex:none}
  .stars{display:flex;gap:3px;color:var(--accent-500)}
  @media (max-width:1023px){.review-wall{column-count:2}}
  @media (max-width:640px){.review-wall{column-count:1}}

  /* ---------- cms list ---------- */
  .post-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
  .post-lead{grid-column:span 2;display:grid;grid-template-columns:1.02fr 1fr;align-items:stretch}
  .post-lead .card-media img{height:100%;aspect-ratio:auto;min-height:260px}
  .post-lead .card-body{padding:30px 32px;gap:14px}
  .post-lead .card-title{font-size:21px;line-height:1.45}
  .empty-state{
    text-align:center;color:var(--ink-500);font-size:15px;padding:56px 20px;
    background:#fff;border:1px dashed var(--line);border-radius:var(--r-card);
  }
  @media (max-width:767px){
    .post-grid{grid-template-columns:1fr}
    .post-lead{grid-column:span 1;grid-template-columns:1fr}
    .post-lead .card-media img{aspect-ratio:16/10;min-height:0}
    .post-lead .card-body{padding:22px 24px}
  }

  /* ---------- faq ---------- */
  .faq-wrap{max-width:800px;margin:0 auto}
  .faq-item{border-bottom:1px solid var(--line)}
  .faq-item:first-child{border-top:1px solid var(--line)}
  .faq-q{
    width:100%;display:flex;align-items:center;justify-content:space-between;gap:20px;
    min-height:56px;padding:16px 4px;text-align:left;font-size:16px;font-weight:600;color:var(--ink-900);
  }
  .faq-icon{
    position:relative;width:20px;height:20px;flex:none;transition:transform .25s var(--ease);color:var(--brand-700);
  }
  .faq-icon::before,.faq-icon::after{
    content:"";position:absolute;background:currentColor;border-radius:2px;
  }
  .faq-icon::before{left:0;right:0;top:9px;height:1.5px}
  .faq-icon::after{top:0;bottom:0;left:9px;width:1.5px}
  .faq-item.is-open .faq-icon{transform:rotate(45deg)}
  .faq-a{max-height:0;overflow:hidden;transition:max-height .3s var(--ease)}
  .faq-a-inner{
    background:#F6F8FA;border-radius:10px;padding:18px 20px;margin:0 4px 18px;
    font-size:14.5px;line-height:1.8;color:var(--ink-700);
  }

  /* ---------- dark cta ---------- */
  .cta-dark{background:var(--brand-900);color:#fff;border-radius:var(--r-block);padding:56px 48px}
  .cta-dark-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center}
  .cta-title{font-size:clamp(1.35rem,2.4vw,1.75rem);font-weight:700;color:#fff;line-height:1.4}
  .cta-actions{display:flex;gap:14px;flex-wrap:wrap;justify-content:flex-end}
  @media (max-width:900px){
    .cta-dark{padding:40px 28px}
    .cta-dark-grid{grid-template-columns:1fr;gap:26px}
    .cta-actions{justify-content:flex-start}
  }
  @media (max-width:520px){.cta-actions .btn{width:100%}}

  /* ---------- soft cta ---------- */
  .cta-soft{background:var(--brand-100);border-radius:var(--r-block);padding:40px 44px;display:flex;align-items:center;justify-content:space-between;gap:28px;flex-wrap:wrap}

  /* ---------- footer ---------- */
  .site-foot{background:var(--bg);border-top:1px solid var(--line);margin-top:0}
  .foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px;padding:64px 0 40px}
  .foot-title{font-size:14px;font-weight:600;color:var(--ink-900);margin-bottom:16px}
  .foot-links a{display:block;font-size:14px;color:var(--ink-500);padding:6px 0;transition:color .2s var(--ease)}
  .foot-links a:hover{color:var(--brand-700)}
  .foot-bottom{
    border-top:1px solid var(--line);padding:20px 0 28px;display:flex;justify-content:space-between;
    gap:16px;flex-wrap:wrap;font-size:12.5px;color:var(--ink-500);
  }
  @media (max-width:900px){.foot-grid{grid-template-columns:repeat(2,1fr);gap:32px;padding:48px 0 32px}}
  @media (max-width:520px){.foot-grid{grid-template-columns:1fr}}

  .breadcrumb{font-size:13px;color:var(--ink-500);display:flex;align-items:center;gap:8px;flex-wrap:wrap}
  .breadcrumb span.sep{color:#C6D2DC}
  .breadcrumb .current{color:var(--brand-700)}

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

/* roulang page: category1 */
:root{
  --brand-700:#17527A;
  --brand-600:#1D6A9C;
  --brand-100:#E7F0F7;
  --brand-900:#0F3A55;
  --accent-500:#E08A3C;
  --ink-900:#14212E;
  --ink-700:#3C4E5F;
  --ink-500:#6B7C8C;
  --line:#E3EAF0;
  --bg:#F7F9FB;
  --card:#FFFFFF;
  --radius:14px;
  --radius-lg:18px;
  --shadow-sm:0 1px 2px rgba(16,42,67,.06),0 8px 24px rgba(16,42,67,.05);
  --shadow-md:0 2px 4px rgba(16,42,67,.08),0 14px 32px rgba(16,42,67,.10);
  --ease:cubic-bezier(.2,.7,.3,1);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink-700);
  font-family:system-ui,-apple-system,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",sans-serif;
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto}
a{color:var(--brand-700);text-decoration:none;transition:color .2s var(--ease)}
a:hover{color:var(--brand-600)}
h1,h2,h3{color:var(--ink-900);margin:0;line-height:1.35;letter-spacing:-.01em}
p{margin:0}
button{font:inherit}
:focus-visible{outline:2px solid var(--brand-700);outline-offset:2px}
.wrap{max-width:1200px;margin:0 auto;padding:0 32px}
.muted{color:var(--ink-500);font-size:14px;line-height:1.8;margin:0}

/* ============ 顶部导航 ============ */
.site-head{position:sticky;top:0;z-index:60;background:#fff;border-bottom:1px solid var(--line)}
.head-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;height:72px}
.logo{display:inline-flex;align-items:center;gap:10px;font-size:17px;font-weight:700;color:var(--ink-900);letter-spacing:.01em;text-decoration:none;line-height:1.2}
.logo:hover{color:var(--brand-700)}
.logo-mark{position:relative;width:20px;height:20px;border-radius:5px;background:var(--brand-700);flex:0 0 auto}
.logo-mark::after{content:"";position:absolute;left:5px;top:5px;width:10px;height:10px;background:#fff;clip-path:polygon(0 0,100% 0,100% 38%,38% 38%,38% 100%,0 100%)}
.nav-links{display:flex;align-items:center;gap:28px}
.nav-link{position:relative;font-size:15px;letter-spacing:.02em;color:var(--ink-700);text-decoration:none;padding:6px 0;white-space:nowrap}
.nav-link:hover{color:var(--brand-700)}
.nav-link.is-active{color:var(--brand-700);font-weight:600}
.nav-link.is-active::after{content:"";position:absolute;left:0;right:0;bottom:-8px;height:2px;border-radius:2px;background:var(--brand-700)}
.nav-toggle{display:none;width:40px;height:40px;border:1px solid var(--line);border-radius:10px;background:#fff;cursor:pointer;align-items:center;justify-content:center;padding:0}
.nav-toggle span{position:relative;display:block;width:18px;height:2px;background:var(--ink-900);border-radius:2px}
.nav-toggle span::before,.nav-toggle span::after{content:"";position:absolute;left:0;width:18px;height:2px;background:var(--ink-900);border-radius:2px}
.nav-toggle span::before{top:-6px}
.nav-toggle span::after{top:6px}

/* ============ 按钮 ============ */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:46px;padding:0 24px;border-radius:10px;border:1px solid transparent;font-size:15px;font-weight:600;cursor:pointer;text-decoration:none;transition:transform .2s var(--ease),box-shadow .2s var(--ease),background-color .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease)}
.btn-primary{background:var(--brand-700);color:#fff}
.btn-primary:hover{background:var(--brand-600);color:#fff;transform:translateY(-2px);box-shadow:var(--shadow-md)}
.btn-accent{background:var(--accent-500);color:#fff}
.btn-accent:hover{background:#cf7c2f;color:#fff;transform:translateY(-2px);box-shadow:var(--shadow-md)}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--ink-900)}
.btn-ghost:hover{border-color:var(--brand-700);background:var(--brand-100);color:var(--brand-700);transform:translateY(-2px)}
.btn-sm{height:38px;padding:0 16px;font-size:14px}
.btn:active{transform:translateY(0)}

/* ============ 页面标题区 ============ */
.banner{
  position:relative;
  border-bottom:1px solid var(--line);
  background-image:linear-gradient(100deg,rgba(255,255,255,.96) 0%,rgba(255,255,255,.86) 46%,rgba(247,249,251,.62) 100%),url(/assets/images/backpic/back-2.webp);
  background-size:cover;
  background-position:center;
  background-repeat:no-repeat;
}
.banner-inner{position:relative;padding:52px 0 48px;max-width:800px}
.crumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--ink-500);margin-bottom:18px}
.crumb a{color:var(--ink-500)}
.crumb a:hover{color:var(--brand-700)}
.crumb .sep{color:#c3cfd9}
.crumb .now{color:var(--brand-700)}
h1.page-title{font-size:clamp(1.75rem,4vw,2.75rem);font-weight:700}
.page-sub{margin-top:16px;font-size:16.5px;line-height:1.8;color:var(--ink-700);max-width:660px}
.tag-row{margin-top:22px;display:flex;flex-wrap:wrap;gap:10px}
.badge{display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:999px;background:var(--brand-100);color:var(--brand-700);font-size:13px;font-weight:600;white-space:nowrap}

/* ============ 数据条 ============ */
.facts{margin-top:48px;background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);display:grid;grid-template-columns:repeat(4,1fr);padding:26px 0}
.fact{padding:0 24px;border-left:1px solid var(--line)}
.fact:first-child{border-left:0}
.fact-num{font-size:22px;font-weight:700;color:var(--ink-900);font-variant-numeric:tabular-nums;letter-spacing:-.01em}
.fact-label{font-size:13px;color:var(--ink-500);margin-top:4px}

/* ============ 主体布局 ============ */
.layout{display:grid;grid-template-columns:260px minmax(0,1fr);gap:48px;align-items:start;margin-top:56px;padding-bottom:96px}
.toc{position:sticky;top:96px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px 20px;box-shadow:var(--shadow-sm)}
.toc-title{font-size:13px;font-weight:600;color:var(--ink-900);letter-spacing:.06em;margin:0 0 12px}
.toc-list{display:flex;flex-direction:column;gap:2px}
.toc-list a{display:block;font-size:14px;color:var(--ink-500);padding:9px 0 9px 12px;border-left:2px solid var(--line);text-decoration:none;transition:color .2s var(--ease),border-color .2s var(--ease)}
.toc-list a:hover{color:var(--brand-700);border-left-color:var(--brand-700)}
.toc-list a.is-current{color:var(--brand-700);border-left-color:var(--brand-700);font-weight:600}
.toc-foot{margin-top:18px;padding-top:16px;border-top:1px solid var(--line);font-size:13px;color:var(--ink-500);line-height:1.8}

/* ============ 文章主体 ============ */
.article{max-width:780px}
.article section{margin-bottom:56px;scroll-margin-top:96px}
.article section:last-child{margin-bottom:0}
.article h2{font-size:clamp(1.375rem,2.6vw,1.875rem);font-weight:650;padding-left:14px;border-left:4px solid var(--brand-700);margin-bottom:22px}
.article h3{font-size:1.125rem;font-weight:600;margin:26px 0 10px}
.article p{font-size:16px;line-height:1.85;color:var(--ink-700);margin-bottom:16px}
.article p:last-child{margin-bottom:0}
.note{background:var(--brand-100);border-left:4px solid var(--brand-700);border-radius:0 12px 12px 0;padding:18px 20px;margin:26px 0;font-size:15px;line-height:1.8;color:var(--ink-700)}
.note strong{color:var(--brand-900);font-weight:650}

.plat-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin:26px 0}
.plat-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px 24px;box-shadow:var(--shadow-sm);transition:transform .2s var(--ease),box-shadow .2s var(--ease)}
.plat-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}
.plat-card h3{margin:0 0 6px;font-size:17px;font-weight:650}
.plat-card p{font-size:14px;line-height:1.7;color:var(--ink-500);margin:0 0 12px}
.plat-file{display:inline-block;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:12.5px;color:var(--brand-700);background:var(--brand-100);border-radius:8px;padding:4px 10px;font-variant-numeric:tabular-nums}

.steps{counter-reset:step;list-style:none;margin:26px 0 0;padding:0}
.steps li{position:relative;counter-increment:step;padding:18px 0 18px 60px;border-bottom:1px dashed var(--line)}
.steps li:last-child{border-bottom:0}
.steps li::before{content:counter(step,decimal-leading-zero);position:absolute;left:0;top:18px;width:36px;height:36px;border-radius:10px;background:var(--brand-100);color:var(--brand-700);display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;font-variant-numeric:tabular-nums}
.steps strong{display:block;color:var(--ink-900);font-size:16px;font-weight:650;margin-bottom:4px}
.steps em{font-style:normal;font-size:14.5px;line-height:1.75;color:var(--ink-700);display:block}

.check-list{list-style:none;margin:20px 0 0;padding:0}
.check-list li{position:relative;padding:12px 0 12px 26px;font-size:15px;line-height:1.8;color:var(--ink-700);border-bottom:1px solid var(--line)}
.check-list li:last-child{border-bottom:0}
.check-list li::before{content:"";position:absolute;left:0;top:21px;width:8px;height:8px;border-radius:999px;background:var(--brand-700)}

/* ============ 底部收口 ============ */
.cta-band{background:var(--brand-100);border-top:1px solid #d6e4ef;border-bottom:1px solid #d6e4ef;padding:76px 0}
.cta-inner{display:flex;align-items:center;justify-content:space-between;gap:36px;flex-wrap:wrap}
.cta-copy{max-width:600px}
.cta-copy h2{font-size:clamp(1.375rem,2.4vw,1.625rem);font-weight:650;margin-bottom:10px}
.cta-copy p{font-size:15px;line-height:1.8;color:var(--ink-700)}
.cta-actions{display:flex;align-items:center;gap:14px;flex-wrap:wrap}

/* ============ 页脚 ============ */
.site-foot{background:var(--bg);border-top:1px solid var(--line);padding:64px 0 0}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:48px}
.foot-title{font-size:14px;font-weight:600;color:var(--ink-900);margin:0 0 14px}
.foot-links{display:flex;flex-direction:column;gap:10px}
.foot-links a{font-size:14px;color:var(--ink-500);text-decoration:none;line-height:1.6}
.foot-links a:hover{color:var(--brand-700)}
.foot-bottom{border-top:1px solid var(--line);padding:20px 0 28px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:12px;color:var(--ink-500)}

/* ============ 响应式 ============ */
@media (max-width:1023px){
  .wrap{padding:0 24px}
  .head-inner{height:60px}
  .nav-toggle{display:inline-flex}
  .nav-cta{display:none}
  .nav-links{
    position:fixed;left:0;right:0;top:60px;bottom:0;
    background:#fff;flex-direction:column;align-items:stretch;gap:0;
    padding:8px 24px 40px;overflow-y:auto;
    transform:translateX(-100%);transition:transform .25s var(--ease);
  }
  .nav-links.is-open{transform:translateX(0)}
  .nav-link{padding:17px 0;border-bottom:1px solid var(--line);font-size:16px}
  .nav-link.is-active::after{display:none}
  .facts{grid-template-columns:repeat(2,1fr);padding:0}
  .fact{padding:18px 22px;border-left:1px solid var(--line);border-top:1px solid var(--line)}
  .fact:nth-child(1),.fact:nth-child(2){border-top:0}
  .fact:nth-child(odd){border-left:0}
  .layout{grid-template-columns:1fr;gap:32px;margin-top:40px}
  .toc{position:static}
  .toc-list{flex-direction:row;flex-wrap:wrap;gap:8px 14px}
  .toc-list a{border-left:0;border-bottom:2px solid var(--line);padding:6px 2px}
  .toc-list a:hover,.toc-list a.is-current{border-left:0;border-bottom-color:var(--brand-700)}
  .foot-grid{grid-template-columns:repeat(2,1fr);gap:32px}
  .cta-band{padding:56px 0}
}
@media (max-width:767px){
  .wrap{padding:0 20px}
  .banner-inner{padding:36px 0 34px}
  h1.page-title{font-size:clamp(1.55rem,7vw,2rem)}
  .page-sub{font-size:15.5px}
  .facts{margin-top:32px;grid-template-columns:1fr}
  .fact{border-left:0;border-top:1px solid var(--line)}
  .fact:first-child{border-top:0}
  .layout{padding-bottom:64px}
  .article h2{font-size:1.4rem;padding-left:12px}
  .plat-grid{grid-template-columns:1fr}
  .steps li{padding:16px 0 16px 52px}
  .steps li::before{width:32px;height:32px;top:16px;font-size:12.5px}
  .cta-inner{gap:24px}
  .cta-actions{width:100%;flex-direction:column;align-items:stretch}
  .cta-actions .btn{width:100%}
  .foot-grid{grid-template-columns:1fr;gap:28px}
  .foot-bottom{flex-direction:column;gap:6px}
}
@media (max-width:479px){
  body{font-size:15.5px}
  .btn{height:44px;padding:0 18px;font-size:14.5px}
  .btn-sm{height:38px}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{transition:none !important;animation:none !important}
}

/* roulang page: article */
:root{
  --brand-700:#17527A;
  --brand-600:#1D6A9C;
  --brand-100:#E7F0F7;
  --brand-900:#0F3A55;
  --accent-500:#E08A3C;
  --ink-900:#14212E;
  --ink-700:#3C4E5F;
  --ink-500:#6B7C8C;
  --line:#E3EAF0;
  --bg:#F7F9FB;
  --card:#FFFFFF;
  --radius-card:14px;
  --radius-lg:18px;
  --radius-btn:10px;
  --shadow-sm:0 1px 2px rgba(16,42,67,.06),0 8px 24px rgba(16,42,67,.05);
  --shadow-md:0 2px 4px rgba(16,42,67,.08),0 14px 32px rgba(16,42,67,.10);
  --ease:cubic-bezier(.2,.7,.3,1);
}
*,*::before,*::after{box-sizing:border-box}
.site-body{
  margin:0;
  background:var(--bg);
  color:var(--ink-700);
  font-family:system-ui,-apple-system,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",sans-serif;
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
.site-body img{max-width:100%;display:block;height:auto}
.site-body a{color:inherit;text-decoration:none}
.site-body button{font-family:inherit}
.wrap{max-width:1200px;margin:0 auto;padding:0 32px}
.muted{color:var(--ink-500);font-size:14px;line-height:1.8}

/* 顶部导航 */
.site-head{position:sticky;top:0;z-index:50;background:#fff;border-bottom:1px solid var(--line)}
.head-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;height:72px}
.logo{display:inline-flex;align-items:center;gap:10px;font-size:17px;font-weight:700;color:var(--ink-900);letter-spacing:.01em}
.logo-mark{position:relative;flex:none;width:20px;height:20px;border-radius:5px;background:var(--brand-700)}
.logo-mark::after{content:"";position:absolute;left:5px;top:9px;width:10px;height:2px;border-radius:2px;background:#fff;transform:rotate(-28deg)}
.nav-links{display:flex;align-items:center;gap:26px}
.nav-link{position:relative;padding:6px 0;font-size:15px;letter-spacing:.02em;color:var(--ink-700);transition:color .2s var(--ease)}
.nav-link:hover{color:var(--brand-700)}
.nav-link.is-active{color:var(--brand-700);font-weight:600}
.nav-link.is-active::after{content:"";position:absolute;left:0;right:0;bottom:-6px;height:2px;border-radius:2px;background:var(--brand-700)}
.head-cta{display:inline-flex;align-items:center;justify-content:center;height:38px;padding:0 18px;border-radius:10px;border:1px solid var(--line);background:#fff;color:var(--ink-900);font-size:14px;font-weight:600;transition:border-color .2s var(--ease),background-color .2s var(--ease),color .2s var(--ease)}
.head-cta:hover{border-color:var(--brand-700);background:var(--brand-100);color:var(--brand-700)}
.head-cta:focus-visible{outline:2px solid var(--brand-700);outline-offset:2px}
.nav-toggle{display:none;width:40px;height:40px;align-items:center;justify-content:center;flex-direction:column;gap:5px;border:1px solid var(--line);border-radius:10px;background:#fff;cursor:pointer}
.nav-toggle-bar{display:block;width:16px;height:1.5px;border-radius:2px;background:var(--ink-900);transition:transform .2s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1){transform:translateY(3.25px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2){transform:translateY(-3.25px) rotate(-45deg)}
.mobile-panel{display:none}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:46px;padding:0 24px;border:1px solid transparent;border-radius:var(--radius-btn);font-size:15px;font-weight:600;cursor:pointer;transition:background-color .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease),transform .2s var(--ease),box-shadow .2s var(--ease)}
.btn:focus-visible{outline:2px solid var(--brand-700);outline-offset:2px}
.btn-primary{background:var(--brand-700);color:#fff}
.btn-primary:hover{background:var(--brand-600)}
.btn-accent{background:var(--accent-500);color:#fff}
.btn-accent:hover{background:#D07C2E}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--ink-900)}
.btn-ghost:hover{border-color:var(--brand-700);background:var(--brand-100);color:var(--brand-700)}
.btn-sm{height:38px;padding:0 16px;font-size:14px}
.text-link{display:inline-flex;align-items:center;gap:6px;font-size:15px;font-weight:600;color:var(--brand-700)}
.text-link::after{content:"→";transition:transform .2s var(--ease)}
.text-link:hover::after{transform:translateX(3px)}
.text-link:focus-visible{outline:2px solid var(--brand-700);outline-offset:2px;border-radius:4px}

/* 徽章与标签 */
.badge{display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:999px;background:var(--brand-100);color:var(--brand-700);font-size:12px;font-weight:500;white-space:nowrap}
.tag-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:40px}
.tag{display:inline-flex;align-items:center;height:28px;padding:0 12px;border-radius:999px;background:var(--brand-100);color:var(--brand-700);font-size:13px;transition:background-color .2s var(--ease)}
.tag:hover{background:#D8E6F1}

/* 面包屑 */
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;padding-top:26px;font-size:13px;color:var(--ink-500)}
.crumbs a{color:var(--ink-500);transition:color .2s var(--ease)}
.crumbs a:hover{color:var(--brand-700)}
.crumbs .sep{color:#C7D3DD}
.crumbs .current{color:var(--brand-700)}

/* 文章头部 */
.art-head{padding:16px 0 28px;border-bottom:1px solid var(--line)}
.art-h1{margin:0 0 16px;max-width:880px;font-size:clamp(1.75rem,4vw,2.5rem);font-weight:700;line-height:1.35;color:var(--ink-900)}
.art-meta{display:flex;flex-wrap:wrap;align-items:center;gap:14px;font-size:13px;color:var(--ink-500)}
.art-meta .dot{width:3px;height:3px;border-radius:50%;background:#C7D3DD}

/* 文章布局 */
.art-layout{display:grid;grid-template-columns:minmax(0,1fr);gap:48px;padding:40px 0 0}
.art-side{display:grid;gap:20px;align-content:start}

/* 正文排版 */
.prose{max-width:760px;font-size:17px;line-height:1.9;color:var(--ink-700)}
.prose p{margin:0 0 1.2em}
.prose h2{position:relative;margin:40px 0 16px;padding-left:14px;font-size:clamp(1.25rem,2.2vw,1.5rem);font-weight:650;line-height:1.5;color:var(--ink-900)}
.prose h2::before{content:"";position:absolute;left:0;top:.35em;bottom:.35em;width:4px;border-radius:2px;background:var(--brand-700)}
.prose h3{margin:28px 0 12px;font-size:1.125rem;font-weight:600;color:var(--ink-900)}
.prose ul,.prose ol{margin:0 0 1.2em;padding-left:22px}
.prose li{margin:6px 0}
.prose ul li::marker{color:var(--brand-700)}
.prose ol li::marker{color:var(--brand-700);font-variant-numeric:tabular-nums}
.prose a{color:var(--brand-700);text-decoration:underline;text-underline-offset:3px}
.prose a:hover{color:var(--accent-500)}
.prose blockquote{margin:24px 0;padding:20px 22px;border-left:4px solid var(--brand-700);border-radius:0 12px 12px 0;background:var(--brand-100);color:var(--ink-900)}
.prose blockquote p:last-child{margin-bottom:0}
.prose img{border-radius:12px;margin:24px 0 12px}
.prose figure{margin:24px 0}
.prose figcaption{font-size:13px;color:var(--ink-500);text-align:center}
.prose pre{margin:20px 0;padding:16px 18px;border:1px solid var(--line);border-radius:12px;background:#F2F5F8;overflow:auto;font-size:14px;line-height:1.7}
.prose code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.92em;padding:2px 6px;border-radius:6px;background:#F2F5F8}
.prose pre code{padding:0;background:none}
.prose table{width:100%;margin:20px 0;border-collapse:collapse;font-size:15px}
.prose th,.prose td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left}
.prose th{background:#F7F9FB;color:var(--ink-900);font-weight:600}
.prose hr{margin:32px 0;border:0;border-top:1px solid var(--line)}

/* 空态 */
.empty-state{padding:32px;border:1px solid var(--line);border-radius:var(--radius-card);background:#fff;text-align:center}
.empty-title{margin:0 0 10px;font-size:18px;font-weight:600;color:var(--ink-900)}
.empty-text{margin:0 0 20px;font-size:15px;color:var(--ink-500)}

/* 侧栏 */
.side-card{padding:20px;border:1px solid var(--line);border-radius:var(--radius-card);background:#fff}
.side-title{display:flex;align-items:center;gap:8px;margin:0 0 14px;font-size:14px;font-weight:600;color:var(--ink-900)}
.side-title::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--brand-700)}
.toc-list{display:grid;gap:10px;margin:0;padding:0;list-style:none;font-size:14px}
.toc-list a{display:block;color:var(--ink-700);line-height:1.6;transition:color .2s var(--ease)}
.toc-list a:hover{color:var(--brand-700)}
.side-list{display:grid;gap:14px;margin:0;padding:0;list-style:none}
.side-item{display:block;font-size:14px;line-height:1.6}
.side-item .side-name{display:block;color:var(--ink-900);font-weight:600;transition:color .2s var(--ease)}
.side-item .side-desc{display:block;color:var(--ink-500);font-size:13px;margin-top:4px}
.side-item:hover .side-name{color:var(--brand-700)}

/* 阅读引导 */
.read-nav{display:grid;margin-top:44px;border-top:1px solid var(--line)}
.read-item{display:block;padding:20px 0;border-bottom:1px solid var(--line);transition:color .2s var(--ease)}
.read-label{margin-bottom:6px;font-size:13px;color:var(--ink-500)}
.read-name{font-size:16px;font-weight:600;color:var(--ink-900);transition:color .2s var(--ease)}
.read-item:hover .read-name{color:var(--brand-700)}

/* 板块标题 */
.band{margin-top:72px}
.sec-title{margin:0 0 10px;font-size:clamp(1.375rem,2.6vw,1.875rem);font-weight:650;line-height:1.45;color:var(--ink-900)}
.sec-sub{margin:0 0 28px;font-size:15px;color:var(--ink-500)}

/* 推荐卡 */
.rec-grid{display:grid;gap:24px}
.rec-card{display:flex;flex-direction:column;overflow:hidden;border:1px solid var(--line);border-radius:var(--radius-card);background:#fff;transition:transform .2s var(--ease),box-shadow .2s var(--ease),border-color .2s var(--ease)}
.rec-card:hover{transform:translateY(-2px);border-color:#D6E2EB;box-shadow:var(--shadow-md)}
.rec-card:focus-visible{outline:2px solid var(--brand-700);outline-offset:2px}
.rec-thumb{width:100%;aspect-ratio:16/9;object-fit:cover;background:var(--brand-100)}
.rec-body{display:flex;flex-direction:column;gap:10px;padding:18px 20px 22px}
.rec-title{margin:0;font-size:16px;font-weight:600;line-height:1.55;color:var(--ink-900)}
.rec-desc{margin:0;font-size:14px;line-height:1.7;color:var(--ink-500)}

/* FAQ */
.faq-wrap{max-width:800px}
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{display:flex;width:100%;align-items:center;justify-content:space-between;gap:16px;height:56px;padding:0;border:0;background:none;font-size:16px;font-weight:600;color:var(--ink-900);text-align:left;cursor:pointer}
.faq-q:focus-visible{outline:2px solid var(--brand-700);outline-offset:2px}
.faq-icon{position:relative;flex:none;width:20px;height:20px;transition:transform .2s var(--ease)}
.faq-icon::before,.faq-icon::after{content:"";position:absolute;border-radius:2px;background:var(--brand-700)}
.faq-icon::before{left:0;right:0;top:9px;height:2px}
.faq-icon::after{top:0;bottom:0;left:9px;width:2px}
.faq-item.is-open .faq-icon{transform:rotate(45deg)}
.faq-a{display:none;padding:20px;border-radius:0 0 10px 10px;background:#F6F8FA;font-size:14px;line-height:1.8;color:var(--ink-700)}
.faq-item.is-open .faq-a{display:block}

/* CTA */
.cta-band{margin-top:72px;padding:40px;border-radius:var(--radius-lg);background:var(--brand-100);display:grid;gap:24px}
.cta-title{margin:0 0 10px;font-size:clamp(1.25rem,2.4vw,1.6rem);font-weight:700;line-height:1.4;color:var(--ink-900)}
.cta-sub{margin:0;font-size:15px;color:var(--ink-700)}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px}

/* 页脚 */
.site-foot{margin-top:80px;padding:56px 0 24px;border-top:1px solid var(--line);background:#F7F9FB}
.foot-grid{display:grid;gap:32px}
.foot-title{margin:0 0 14px;font-size:14px;font-weight:600;color:var(--ink-900)}
.foot-links{display:grid;gap:10px}
.foot-links a{font-size:14px;line-height:1.6;color:var(--ink-500);transition:color .2s var(--ease)}
.foot-links a:hover{color:var(--brand-700)}
.foot-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;margin-top:40px;padding-top:20px;border-top:1px solid var(--line);font-size:12px;color:var(--ink-500)}

/* 响应式 */
@media(min-width:768px){
  .foot-grid{grid-template-columns:repeat(2,1fr)}
  .read-nav{grid-template-columns:1fr 1fr}
  .read-item+.read-item{border-left:1px solid var(--line);padding-left:24px}
  .rec-grid{grid-template-columns:repeat(2,1fr)}
}
@media(min-width:900px){
  .cta-band{grid-template-columns:1fr auto;align-items:center;padding:48px}
}
@media(min-width:1024px){
  .foot-grid{grid-template-columns:1.4fr 1fr 1fr 1fr}
  .rec-grid{grid-template-columns:repeat(3,1fr)}
}
@media(min-width:1280px){
  .art-layout{grid-template-columns:minmax(0,760px) 300px;justify-content:center;gap:64px}
  .art-side{position:sticky;top:96px}
}
@media(max-width:1023px){
  .wrap{padding:0 24px}
  .nav-links,.head-cta{display:none}
  .nav-toggle{display:inline-flex}
  .mobile-panel{
    display:block;position:fixed;left:0;right:0;bottom:0;top:72px;z-index:40;
    padding:8px 24px 32px;background:#fff;overflow-y:auto;
    opacity:0;visibility:hidden;transform:translateY(-6px);
    transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s var(--ease);
  }
  .mobile-panel.is-open{opacity:1;visibility:visible;transform:none}
  .mobile-panel a{display:block;line-height:52px;border-bottom:1px solid var(--line);font-size:16px;color:var(--ink-900)}
  .mobile-panel a.is-active{color:var(--brand-700);font-weight:600}
  .mobile-panel .mobile-cta{margin-top:20px;border-bottom:0}
  .mobile-panel .mobile-cta .btn{width:100%}
}
@media(max-width:767px){
  .wrap{padding:0 20px}
  .head-inner{height:60px}
  .mobile-panel{top:60px;padding:8px 20px 32px}
  .band,.cta-band,.site-foot{margin-top:56px}
  .site-foot{padding-top:40px}
  .art-layout{padding-top:32px;gap:40px}
  .prose{font-size:16.5px}
  .cta-band{padding:32px 24px}
}
@media(max-width:479px){
  .art-h1{font-size:1.6rem}
  .btn{width:100%}
  .cta-actions{flex-direction:column}
}
@media(prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important;scroll-behavior:auto!important}
}

/* roulang page: category2 */
:root{
  --brand-900:#0F3A55;
  --brand-700:#17527A;
  --brand-600:#1D6A9C;
  --brand-100:#E7F0F7;
  --accent-500:#E08A3C;
  --ink-900:#14212E;
  --ink-700:#3C4E5F;
  --ink-500:#6B7C8C;
  --line:#E3EAF0;
  --bg:#F7F9FB;
  --card:#FFFFFF;
  --radius-card:14px;
  --radius-block:18px;
  --radius-btn:10px;
  --shadow-soft:0 1px 2px rgba(16,42,67,.06),0 8px 24px rgba(16,42,67,.05);
  --shadow-hover:0 2px 4px rgba(16,42,67,.08),0 14px 32px rgba(16,42,67,.10);
  --ease:cubic-bezier(.2,.7,.3,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:system-ui,-apple-system,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",sans-serif;
  font-size:16px;
  line-height:1.75;
  color:var(--ink-700);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;cursor:pointer}
input,textarea{font:inherit}
h1,h2,h3,h4,p{margin:0}
ul{margin:0;padding:0;list-style:none}
:focus-visible{outline:2px solid var(--brand-700);outline-offset:2px;border-radius:4px}
.wrap{width:100%;max-width:1200px;margin:0 auto;padding:0 32px}
.muted{color:var(--ink-500);font-size:14px;line-height:1.75}

/* ---------- 顶部导航 ---------- */
.site-head{position:sticky;top:0;z-index:60;background:#fff;border-bottom:1px solid var(--line)}
.head-inner{display:flex;align-items:center;gap:32px;min-height:72px}
.logo{display:inline-flex;align-items:center;gap:10px;font-size:19px;font-weight:700;color:var(--ink-900);letter-spacing:.01em;white-space:nowrap}
.logo-mark{position:relative;flex:0 0 22px;width:22px;height:22px;border-radius:6px;background:var(--brand-700)}
.logo-mark::before{content:"";position:absolute;left:6px;top:6px;width:10px;height:9px;border-left:2px solid #fff;border-bottom:2px solid #fff;transform:skewX(-12deg)}
.nav-links{display:flex;align-items:center;gap:26px;margin-left:auto}
.nav-link{position:relative;display:inline-block;padding:6px 0;font-size:15px;letter-spacing:.02em;color:var(--ink-700);transition:color .2s var(--ease)}
.nav-link:hover{color:var(--brand-700)}
.nav-link.is-active{color:var(--brand-700);font-weight:600}
.nav-link.is-active::after{content:"";position:absolute;left:0;right:0;bottom:-6px;height:2px;border-radius:2px;background:var(--brand-700)}
.head-cta{display:flex;align-items:center}
.nav-toggle{display:none;flex-direction:column;justify-content:center;gap:5px;width:40px;height:40px;padding:0;margin-left:auto;background:transparent;border:0}
.nav-toggle span{display:block;width:22px;height:1.5px;border-radius:2px;background:var(--ink-900);transition:transform .2s var(--ease),opacity .2s var(--ease)}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(6.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-6.5px) rotate(-45deg)}

/* ---------- 按钮与文字链 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:46px;padding:0 24px;border:1px solid transparent;border-radius:var(--radius-btn);font-size:15px;font-weight:600;line-height:1;white-space:nowrap;transition:background .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease),transform .2s var(--ease),box-shadow .2s var(--ease)}
.btn-primary{background:var(--brand-700);color:#fff}
.btn-primary:hover{background:var(--brand-600);transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.btn-primary:active{transform:translateY(0);box-shadow:var(--shadow-soft)}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--ink-900)}
.btn-ghost:hover{border-color:var(--brand-700);background:var(--brand-100)}
.btn-accent{background:var(--accent-500);color:#fff}
.btn-accent:hover{filter:brightness(.95);transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.btn-sm{height:38px;padding:0 18px;font-size:14px}
.btn-block{width:100%}
.text-link{display:inline-flex;align-items:center;gap:6px;color:var(--brand-700);font-size:15px;font-weight:600}
.text-link::after{content:"→";transition:transform .2s var(--ease)}
.text-link:hover::after{transform:translateX(4px)}

/* ---------- 徽章 ---------- */
.badge{display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:999px;background:var(--brand-100);color:var(--brand-700);font-size:13px;font-weight:600;line-height:1}
.badge-plain{background:#F1F5F9;color:var(--ink-700)}
.badge-dot{display:inline-block;width:6px;height:6px;border-radius:999px;background:var(--brand-700);margin-right:6px}

/* ---------- 面包屑 ---------- */
.crumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--ink-500)}
.crumb a{color:var(--ink-500)}
.crumb a:hover{color:var(--brand-700)}
.crumb-sep{color:#B9C6D2}
.crumb [aria-current="page"]{color:var(--brand-700);font-weight:600}

/* ---------- 页面顶部 ---------- */
.page-hero{position:relative;min-height:240px;display:flex;align-items:flex-end;background-color:var(--brand-100);background-size:cover;background-position:center}
.page-hero::before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(255,255,255,.94) 0%,rgba(255,255,255,.82) 42%,rgba(255,255,255,.52) 100%)}
.page-hero .wrap{position:relative;z-index:2;padding-top:56px;padding-bottom:40px}
.page-hero .crumb{margin-bottom:16px}
.page-hero h1{max-width:820px;font-size:clamp(1.75rem,4vw,2.75rem);font-weight:700;line-height:1.28;color:var(--ink-900);letter-spacing:.01em}
.lede{max-width:720px;margin-top:14px;font-size:17px;line-height:1.8;color:var(--ink-700)}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}

/* ---------- 区块 ---------- */
.section{padding:96px 0}
.section-tight{padding:72px 0}
.section-alt{background:#fff}
.section-head{max-width:760px;margin-bottom:48px}
.kicker{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;letter-spacing:.08em;color:var(--brand-700);text-transform:none}
.sec-title{position:relative;margin-top:14px;padding-left:16px;font-size:clamp(1.375rem,2.6vw,1.875rem);font-weight:650;line-height:1.4;color:var(--ink-900)}
.sec-title::before{content:"";position:absolute;left:0;top:6px;bottom:6px;width:4px;border-radius:2px;background:var(--brand-700)}
.sec-intro{margin-top:16px;font-size:16px;line-height:1.8;color:var(--ink-700)}

/* ---------- 图文交错 ---------- */
.zig-row{display:grid;grid-template-columns:1.05fr 1fr;gap:56px;align-items:center;padding:56px 0;border-top:1px solid var(--line)}
.zig-row:first-of-type{border-top:0;padding-top:0}
.zig-row.reverse .zig-media{order:2}
.zig-media{border-radius:var(--radius-block);overflow:hidden;box-shadow:var(--shadow-soft);aspect-ratio:16/10;background:var(--brand-100)}
.zig-media img{width:100%;height:100%;object-fit:cover;transition:transform .4s var(--ease)}
.zig-media:hover img{transform:scale(1.03)}
.zig-body h3{font-size:1.25rem;font-weight:600;color:var(--ink-900);line-height:1.5}
.zig-body p{margin-top:16px;font-size:16px;line-height:1.85}
.zig-list{margin-top:20px;display:flex;flex-direction:column;gap:12px}
.zig-list li{position:relative;padding-left:20px;font-size:15px;line-height:1.8;color:var(--ink-700)}
.zig-list li::before{content:"";position:absolute;left:0;top:10px;width:8px;height:8px;border-radius:999px;background:var(--brand-700)}
.zig-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}
.note{margin-top:22px;padding:18px 20px;border-left:4px solid var(--brand-700);border-radius:0 var(--radius-card) var(--radius-card) 0;background:var(--brand-100);font-size:15px;line-height:1.8;color:var(--ink-700)}

/* ---------- 卡片组 ---------- */
.grid-uneven{display:grid;grid-template-columns:1.25fr 1fr;gap:24px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius-card);padding:28px;transition:transform .2s var(--ease),box-shadow .2s var(--ease),border-color .2s var(--ease)}
.card:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover);border-color:#D6E2EC}
.card h3{font-size:1.125rem;font-weight:600;color:var(--ink-900)}
.card p{margin-top:12px;font-size:15px;line-height:1.8;color:var(--ink-700)}
.card .card-link{margin-top:18px}
.card-mark{width:28px;height:28px;border-radius:8px;background:var(--brand-100);position:relative;margin-bottom:16px}
.card-mark::after{content:"";position:absolute;left:9px;top:8px;width:10px;height:10px;border-top:2px solid var(--brand-700);border-right:2px solid var(--brand-700)}
.card-lead{background:linear-gradient(180deg,#FFFFFF 0%,#F8FBFD 100%)}

/* ---------- FAQ ---------- */
.faq{max-width:800px;margin:0 auto}
.faq-item{border-bottom:1px solid var(--line)}
.faq-item:first-child{border-top:1px solid var(--line)}
.faq-q{display:flex;align-items:center;justify-content:space-between;gap:20px;width:100%;min-height:56px;padding:14px 0;background:transparent;border:0;text-align:left;font-size:16px;font-weight:600;color:var(--ink-900);transition:color .2s var(--ease)}
.faq-q:hover{color:var(--brand-700)}
.faq-icon{position:relative;flex:0 0 20px;width:20px;height:20px;transition:transform .25s var(--ease)}
.faq-icon::before,.faq-icon::after{content:"";position:absolute;top:9px;left:2px;width:16px;height:2px;border-radius:2px;background:var(--brand-700)}
.faq-icon::after{transform:rotate(90deg)}
.faq-item.is-open .faq-icon{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s var(--ease)}
.faq-a-inner{padding:20px;background:#F6F8FA;border-radius:12px;margin-bottom:18px}
.faq-a-inner p{font-size:15px;line-height:1.8;color:var(--ink-700)}
.faq-a-inner p + p{margin-top:12px}

/* ---------- 底部收口 ---------- */
.cta-band{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:32px;padding:48px;border-radius:var(--radius-block);background:var(--brand-100)}
.cta-title{font-size:1.375rem;font-weight:650;line-height:1.4;color:var(--ink-900)}
.cta-text{margin-top:12px;max-width:620px;font-size:15px;line-height:1.8;color:var(--ink-700)}
.cta-actions{display:flex;flex-wrap:wrap;align-items:center;gap:20px}

/* ---------- 页脚 ---------- */
.site-foot{margin-top:96px;padding-top:64px;background:#F7F9FB;border-top:1px solid var(--line)}
.foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:40px}
.foot-title{margin:2px 0 14px;font-size:14px;font-weight:600;color:var(--ink-900)}
.foot-links{display:flex;flex-direction:column;gap:10px}
.foot-links a{font-size:14px;color:var(--ink-500);transition:color .2s var(--ease)}
.foot-links a:hover{color:var(--brand-700)}
.foot-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;margin-top:48px;padding:20px 0 28px;border-top:1px solid var(--line);font-size:12px;color:var(--ink-500)}

/* ---------- 响应式 ---------- */
@media (max-width:1279px){
  .zig-row{gap:40px}
}
@media (max-width:1023px){
  .wrap{padding:0 24px}
  .head-inner{min-height:60px}
  .nav-toggle{display:flex}
  .head-cta{display:none}
  .nav-links{
    position:fixed;left:0;right:0;top:60px;bottom:0;
    flex-direction:column;align-items:stretch;gap:0;
    margin-left:0;padding:8px 24px 40px;
    background:#fff;overflow-y:auto;
    transform:translateX(-100%);
    transition:transform .25s var(--ease);
  }
  .nav-links.is-open{transform:translateX(0)}
  .nav-link{display:flex;align-items:center;height:52px;padding:0 4px;font-size:16px;border-bottom:1px solid var(--line)}
  .nav-link.is-active::after{display:none}
  .zig-row{grid-template-columns:1fr;gap:24px;padding:44px 0}
  .zig-row.reverse .zig-media{order:0}
  .section{padding:72px 0}
  .section-tight{padding:56px 0}
  .section-head{margin-bottom:36px}
  .grid-uneven{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr;gap:32px}
  .cta-band{padding:36px}
}
@media (max-width:767px){
  .wrap{padding:0 20px}
  .page-hero .wrap{padding-top:36px;padding-bottom:32px}
  .page-hero::before{background:linear-gradient(180deg,rgba(255,255,255,.94) 0%,rgba(255,255,255,.86) 100%)}
  .lede{font-size:16px}
  .section{padding:56px 0}
  .faq-q{font-size:15px}
  .cta-band{padding:28px}
  .cta-actions{width:100%;flex-direction:column;align-items:stretch;gap:14px}
  .cta-actions .btn{width:100%}
  .foot-grid{grid-template-columns:1fr}
  .foot-bottom{flex-direction:column;gap:6px}
}
@media (max-width:520px){
  body{font-size:15px}
  .page-hero h1{font-size:1.6rem}
  .zig-body h3{font-size:1.0625rem}
  .card{padding:22px}
  .section-head{margin-bottom:28px}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none !important;animation:none !important}
  .card:hover{transform:none}
  .zig-media:hover img{transform:none}
}

/* roulang page: category3 */
:root{
  --brand-700:#17527A;
  --brand-600:#1D6A9C;
  --brand-100:#E7F0F7;
  --brand-900:#0F3A55;
  --accent-500:#E08A3C;
  --ink-900:#14212E;
  --ink-700:#3C4E5F;
  --ink-500:#6B7C8C;
  --line:#E3EAF0;
  --bg:#F7F9FB;
  --soft:#F6F8FA;
  --radius:14px;
  --radius-lg:18px;
  --radius-btn:10px;
  --shadow:0 1px 2px rgba(16,42,67,.06),0 8px 24px rgba(16,42,67,.05);
  --shadow-hover:0 2px 4px rgba(16,42,67,.08),0 14px 32px rgba(16,42,67,.10);
  --ease:cubic-bezier(.2,.7,.3,1);
  --font-cn:system-ui,-apple-system,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font-cn);
  font-size:16px;
  line-height:1.75;
  color:var(--ink-700);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer;color:inherit}
h1,h2,h3,h4,p{margin:0}
ul{margin:0;padding:0;list-style:none}
:focus-visible{outline:2px solid var(--brand-700);outline-offset:2px;border-radius:4px}

.wrap{width:100%;max-width:1200px;margin:0 auto;padding:0 32px}

/* ---------- header ---------- */
.site-head{position:sticky;top:0;z-index:60;background:#fff;border-bottom:1px solid var(--line)}
.nav-inner{height:72px;display:flex;align-items:center;gap:36px}
.logo{display:inline-flex;align-items:center;gap:10px;font-size:18px;font-weight:700;color:var(--ink-900);letter-spacing:.01em}
.logo-mark{position:relative;width:20px;height:20px;border-radius:5px;background:var(--brand-700);overflow:hidden;flex:none}
.logo-mark::after{content:"";position:absolute;left:-4px;top:9px;width:30px;height:2px;background:#fff;opacity:.9;transform:rotate(-42deg)}
.nav-links{display:flex;align-items:center;gap:28px;margin-left:auto}
.nav-link{position:relative;display:inline-block;padding:6px 0;font-size:15px;letter-spacing:.02em;color:var(--ink-700);transition:color .2s var(--ease)}
.nav-link::after{content:"";position:absolute;left:0;right:0;bottom:-4px;height:2px;border-radius:2px;background:transparent;transition:background .2s var(--ease)}
.nav-link:hover{color:var(--brand-700)}
.nav-link:hover::after{background:var(--brand-100)}
.nav-link.is-active{color:var(--brand-700);font-weight:600}
.nav-link.is-active::after{background:var(--brand-700)}
.head-cta{display:inline-flex;align-items:center;justify-content:center;height:38px;padding:0 18px;border-radius:var(--radius-btn);font-size:14px;font-weight:600;background:var(--brand-700);color:#fff;border:1px solid var(--brand-700);transition:all .2s var(--ease)}
.head-cta:hover{background:var(--brand-600);border-color:var(--brand-600)}
.nav-toggle{display:none;margin-left:auto;align-items:center;justify-content:center;width:40px;height:40px;border:1px solid var(--line);background:#fff;border-radius:10px}
.nav-toggle span{position:relative;display:block;width:16px;height:1.5px;background:var(--ink-900);border-radius:2px}
.nav-toggle span::before,.nav-toggle span::after{content:"";position:absolute;left:0;width:16px;height:1.5px;background:var(--ink-900);border-radius:2px}
.nav-toggle span::before{top:-5px}
.nav-toggle span::after{top:5px}
.mobile-panel{display:none;background:#fff;border-top:1px solid var(--line)}
.mobile-panel.is-open{display:block}
.mobile-panel a{display:block;padding:0 24px;line-height:52px;font-size:16px;color:var(--ink-700);border-bottom:1px solid var(--line)}
.mobile-panel a:last-child{border-bottom:0}
.mobile-panel a.is-active{color:var(--brand-700);font-weight:600}

/* ---------- hero ---------- */
.hero{background:#fff;padding:36px 0 0}
.crumb{display:flex;align-items:center;flex-wrap:wrap;gap:8px;font-size:13px;color:var(--ink-500)}
.crumb .divider{color:#C4D1DB}
.crumb .current{color:var(--brand-700);font-weight:600}
.hero-title{margin-top:16px;max-width:900px;font-size:clamp(1.75rem,4vw,2.75rem);line-height:1.25;font-weight:700;color:var(--ink-900);letter-spacing:-.01em}
.hero-lead{margin-top:16px;max-width:780px;font-size:17px;color:var(--ink-700)}
.badge-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}
.badge{display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:999px;background:var(--brand-100);color:var(--brand-700);font-size:12.5px;font-weight:600;letter-spacing:.02em}
.badge-plain{background:#fff;border:1px solid var(--line);color:var(--ink-500);font-weight:500}
.hero-band{position:relative;margin-top:32px;height:240px;border-radius:var(--radius-lg);overflow:hidden;background:var(--brand-100)}
.hero-band img{width:100%;height:100%;object-fit:cover}
.hero-band::after{content:"";position:absolute;inset:0;background:rgba(247,249,251,.12)}
.hero-band-tag{position:absolute;left:24px;bottom:24px;z-index:2;display:inline-flex;align-items:center;gap:8px;padding:8px 16px;border-radius:999px;background:#fff;color:var(--ink-900);font-size:13px;font-weight:600;box-shadow:var(--shadow)}
.hero-band-tag i{width:6px;height:6px;border-radius:999px;background:var(--accent-500);flex:none}

/* ---------- section ---------- */
.sec{padding:96px 0}
.sec.is-white{background:#fff}
.sec-head{max-width:780px;margin-bottom:40px}
.sec-title{position:relative;padding-left:16px;font-size:clamp(1.375rem,2.6vw,1.875rem);font-weight:650;line-height:1.4;color:var(--ink-900)}
.sec-title::before{content:"";position:absolute;left:0;top:.34em;bottom:.3em;width:4px;border-radius:2px;background:var(--brand-700)}
.sec-sub{margin-top:16px;font-size:15px;color:var(--ink-500);max-width:760px}

/* ---------- value row ---------- */
.value-row{display:grid;grid-template-columns:repeat(3,1fr)}
.value-item{padding:0 32px;border-left:1px solid var(--line)}
.value-item:first-child{border-left:0;padding-left:0}
.value-dot{display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;border-radius:6px;background:var(--brand-100);position:relative;margin-bottom:14px}
.value-dot::after{content:"";width:8px;height:8px;border-radius:2px;background:var(--brand-700)}
.value-name{font-size:16px;font-weight:600;color:var(--ink-900)}
.value-text{margin-top:10px;font-size:14px;line-height:1.8;color:var(--ink-500)}

/* ---------- steps ---------- */
.steps{border-top:1px solid var(--line)}
.step{display:grid;grid-template-columns:110px 1fr;gap:24px;padding:32px 0;border-bottom:1px solid var(--line)}
.step-no{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-variant-numeric:tabular-nums;font-size:clamp(2.25rem,4vw,3rem);line-height:1;font-weight:700;color:var(--brand-700);letter-spacing:-.03em}
.step-title{font-size:1.125rem;font-weight:600;color:var(--ink-900)}
.step-desc{margin-top:10px;max-width:840px;color:var(--ink-700)}
.step-tip{margin-top:14px;padding:12px 16px;border-left:3px solid var(--brand-700);border-radius:0 8px 8px 0;background:var(--soft);font-size:14px;line-height:1.8;color:var(--ink-700);max-width:840px}
.step-tip b{color:var(--brand-700);font-weight:600}

/* ---------- split ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.split-media{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);background:var(--brand-100)}
.split-media img{width:100%;aspect-ratio:4/3;object-fit:cover}
.split-body p{margin-top:16px;color:var(--ink-700)}
.split-list{margin-top:24px;display:grid;gap:12px}
.split-list li{display:flex;gap:12px;font-size:15px;color:var(--ink-700)}
.split-list li::before{content:"";flex:none;width:6px;height:6px;margin-top:10px;border-radius:999px;background:var(--brand-700)}

/* ---------- rows ---------- */
.rows{border-top:1px solid var(--line)}
.row-item{display:grid;grid-template-columns:240px 1fr;gap:32px;align-items:baseline;padding:22px 0;border-bottom:1px dashed var(--line)}
.row-key{font-size:15px;font-weight:600;color:var(--ink-900);display:flex;align-items:center;gap:10px}
.row-key kbd{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:12px;padding:2px 8px;border:1px solid var(--line);border-bottom-width:2px;border-radius:6px;background:#fff;color:var(--brand-700)}
.row-val{font-size:15px;color:var(--ink-700)}

/* ---------- faq ---------- */
.faq{max-width:800px;margin:0 auto;border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{width:100%;min-height:56px;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 0;background:none;border:0;text-align:left;font-size:16px;font-weight:600;color:var(--ink-900);transition:color .2s var(--ease)}
.faq-q:hover{color:var(--brand-700)}
.faq-icon{position:relative;flex:none;width:20px;height:20px;color:var(--brand-700);transition:transform .25s var(--ease)}
.faq-icon::before,.faq-icon::after{content:"";position:absolute;left:50%;top:50%;background:currentColor;border-radius:2px}
.faq-icon::before{width:14px;height:1.6px;transform:translate(-50%,-50%)}
.faq-icon::after{width:1.6px;height:14px;transform:translate(-50%,-50%)}
.faq-item.is-open .faq-icon{transform:rotate(45deg)}
.faq-a{display:none;padding:20px;border-radius:0 0 10px 10px;background:var(--soft);font-size:14px;line-height:1.8;color:var(--ink-700)}
.faq-item.is-open .faq-a{display:block}

/* ---------- cta ---------- */
.cta-block{background:var(--brand-100);border-radius:var(--radius-lg);padding:48px;display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap}
.cta-title{font-size:clamp(1.25rem,2.4vw,1.625rem);font-weight:650;color:var(--ink-900);line-height:1.4}
.cta-note{margin-top:12px;font-size:14px;color:var(--ink-500)}
.cta-actions{display:flex;align-items:center;gap:20px;flex-wrap:wrap}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;height:46px;padding:0 24px;border-radius:var(--radius-btn);border:1px solid transparent;font-size:15px;font-weight:600;transition:all .2s var(--ease)}
.btn-primary{background:var(--brand-700);color:#fff}
.btn-primary:hover{background:var(--brand-600);transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.btn-accent{background:var(--accent-500);color:#fff}
.btn-accent:hover{filter:brightness(1.06);transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--ink-900)}
.btn-ghost:hover{border-color:var(--brand-700);background:var(--brand-100);color:var(--brand-700)}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none;box-shadow:none}
.link-arrow{display:inline-flex;align-items:center;gap:6px;font-size:15px;font-weight:600;color:var(--brand-700)}
.link-arrow i{font-style:normal;transition:transform .2s var(--ease)}
.link-arrow:hover i{transform:translateX(2px)}
.link-arrow:hover{color:var(--accent-500)}

/* ---------- footer ---------- */
.site-foot{margin-top:0;border-top:1px solid var(--line);background:var(--bg);padding:64px 0 0}
.foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:40px}
.foot-title{margin-bottom:14px;font-size:14px;font-weight:600;color:var(--ink-900)}
.foot-links{display:flex;flex-direction:column;gap:10px}
.foot-links a{font-size:14px;color:var(--ink-500);transition:color .2s var(--ease)}
.foot-links a:hover{color:var(--brand-700)}
.muted{font-size:14px;color:var(--ink-500);line-height:1.8}
.foot-bottom{margin-top:48px;padding:20px 0;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:12px;color:var(--ink-500)}

@media (max-width:1279px){
  .wrap{padding:0 32px}
}
@media (max-width:1023px){
  .wrap{padding:0 24px}
  .nav-links,.head-cta{display:none}
  .nav-toggle{display:inline-flex}
  .nav-inner{height:64px}
  .sec{padding:72px 0}
  .split{grid-template-columns:1fr;gap:32px}
  .row-item{grid-template-columns:200px 1fr;gap:24px}
  .foot-grid{grid-template-columns:1fr 1fr;gap:32px}
}
@media (max-width:767px){
  body{font-size:16px;line-height:1.7}
  .wrap{padding:0 20px}
  .nav-inner{height:60px}
  .sec{padding:56px 0}
  .hero{padding:24px 0 0}
  .hero-band{height:200px}
  .hero-band-tag{left:16px;bottom:16px;font-size:12.5px;padding:7px 12px}
  .value-row{grid-template-columns:1fr}
  .value-item{padding:24px 0 0;border-left:0;border-top:1px solid var(--line)}
  .value-item:first-child{padding-top:0;border-top:0}
  .step{grid-template-columns:1fr;gap:10px;padding:26px 0}
  .step-no{font-size:2rem}
  .row-item{grid-template-columns:1fr;gap:8px}
  .cta-block{padding:32px 24px}
  .foot-grid{grid-template-columns:1fr;gap:28px}
  .faq-a{padding:18px 16px}
}
@media (max-width:520px){
  .hero-title{font-size:1.65rem;line-height:1.3}
  .cta-actions{width:100%}
  .btn{width:100%}
  .cta-actions .btn{width:100%}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none !important;animation:none !important;scroll-behavior:auto !important}
}

/* roulang page: category4 */
:root{
    --brand-700:#17527A;
    --brand-600:#1D6A9C;
    --brand-100:#E7F0F7;
    --brand-900:#0F3A55;
    --accent-500:#E08A3C;
    --ink-900:#14212E;
    --ink-700:#3C4E5F;
    --ink-500:#6B7C8C;
    --line:#E3EAF0;
    --bg:#F7F9FB;
    --card:#FFFFFF;
    --r-card:14px;
    --r-block:18px;
    --r-btn:10px;
    --sh-1:0 1px 2px rgba(16,42,67,.06), 0 8px 24px rgba(16,42,67,.05);
    --sh-2:0 2px 4px rgba(16,42,67,.08), 0 14px 32px rgba(16,42,67,.10);
    --dur:200ms;
    --ease:cubic-bezier(.2,.7,.3,1);
  }

  *,*::before,*::after{box-sizing:border-box;}
  html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
  body{
    margin:0;
    font-family:system-ui,-apple-system,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",sans-serif;
    font-size:16px;
    line-height:1.75;
    color:var(--ink-700);
    background:var(--bg);
  }
  h1,h2,h3,h4,p,ul,ol,figure{margin:0;}
  ul,ol{padding:0;list-style:none;}
  a{color:inherit;text-decoration:none;transition:color var(--dur) var(--ease);}
  img{max-width:100%;display:block;}
  button{font:inherit;color:inherit;}
  :focus-visible{outline:2px solid var(--brand-700);outline-offset:2px;}
  @media (prefers-reduced-motion:reduce){
    *{transition:none !important;animation:none !important;scroll-behavior:auto !important;}
  }

  .skip{
    position:absolute;left:-9999px;top:0;background:var(--brand-700);color:#fff;
    padding:10px 16px;border-radius:0 0 10px 0;z-index:100;
  }
  .skip:focus{left:0;}

  .wrap{max-width:1200px;margin:0 auto;padding:0 32px;}

  /* ---------- 导航 ---------- */
  .site-head{
    position:sticky;top:0;z-index:60;background:#fff;border-bottom:1px solid var(--line);
  }
  .head-inner{display:flex;align-items:center;gap:32px;height:72px;}
  .logo{
    display:inline-flex;align-items:center;gap:10px;
    font-size:18px;font-weight:700;color:var(--ink-900);letter-spacing:.01em;white-space:nowrap;
  }
  .logo-mark{
    position:relative;width:20px;height:20px;border-radius:6px;background:var(--brand-700);flex:0 0 20px;
  }
  .logo-mark::before{
    content:"";position:absolute;left:4px;top:6px;width:9px;height:2px;background:#fff;border-radius:1px;
    box-shadow:0 6px 0 #fff;
  }
  .nav-links{display:flex;align-items:center;gap:28px;margin-left:auto;}
  .nav-link{
    position:relative;display:inline-flex;align-items:center;
    height:72px;font-size:15px;letter-spacing:.02em;color:var(--ink-700);
  }
  .nav-link:hover{color:var(--brand-700);}
  .nav-link.is-active{color:var(--brand-700);font-weight:600;}
  .nav-link.is-active::after{
    content:"";position:absolute;left:0;right:0;bottom:0;height:2px;border-radius:2px;background:var(--brand-700);
  }
  .head-actions{display:flex;align-items:center;gap:14px;margin-left:8px;}
  .nav-toggle{
    display:none;width:40px;height:40px;border:1px solid var(--line);background:#fff;border-radius:10px;
    align-items:center;justify-content:center;flex-direction:column;gap:4px;cursor:pointer;
  }
  .nav-toggle span{display:block;width:16px;height:2px;background:var(--ink-900);border-radius:2px;transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease);}
  .nav-toggle:hover{border-color:var(--brand-700);}
  .mobile-nav{display:none;background:#fff;border-top:1px solid var(--line);}
  .mobile-nav a{
    display:block;padding:15px 32px;font-size:15px;color:var(--ink-700);border-bottom:1px solid var(--line);
  }
  .mobile-nav a:hover{color:var(--brand-700);}
  .mobile-nav a.is-active{color:var(--brand-700);font-weight:600;}

  /* ---------- 按钮 ---------- */
  .btn{
    display:inline-flex;align-items:center;justify-content:center;gap:8px;
    height:46px;padding:0 24px;border-radius:var(--r-btn);
    font-size:15px;font-weight:600;border:1px solid transparent;cursor:pointer;
    transition:background var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease),transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
  }
  .btn-sm{height:38px;padding:0 18px;font-size:14px;}
  .btn-brand{background:var(--brand-700);color:#fff;}
  .btn-brand:hover{background:var(--brand-600);transform:translateY(-2px);box-shadow:var(--sh-2);}
  .btn-brand:active{transform:translateY(0);}
  .btn-ghost{background:#fff;border-color:var(--line);color:var(--ink-900);}
  .btn-ghost:hover{border-color:var(--brand-700);background:var(--brand-100);color:var(--brand-700);}
  .link-arrow{
    display:inline-flex;align-items:center;gap:4px;color:var(--brand-700);font-size:14px;font-weight:600;
  }
  .link-arrow::after{content:"→";transition:transform var(--dur) var(--ease);}
  .link-arrow:hover::after{transform:translateX(2px);}

  .badge{
    display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:999px;
    background:var(--brand-100);color:var(--brand-700);font-size:13px;font-weight:600;white-space:nowrap;
  }

  /* ---------- 分类页头图 ---------- */
  .cat-hero{
    position:relative;min-height:260px;display:flex;align-items:flex-end;
    padding:44px 0 36px;
    background-image:url("/assets/images/backpic/back-2.webp");
    background-size:cover;background-position:center;
  }
  .cat-hero::before{
    content:"";position:absolute;inset:0;
    background:linear-gradient(90deg,rgba(247,249,251,.95) 0%,rgba(247,249,251,.82) 52%,rgba(247,249,251,.58) 100%);
  }
  .cat-hero .wrap{position:relative;z-index:1;}
  .crumb{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--ink-500);margin-bottom:16px;}
  .crumb a:hover{color:var(--brand-700);}
  .crumb .sep{width:1px;height:12px;background:var(--line);transform:rotate(18deg);}
  .crumb .now{color:var(--brand-700);}
  .cat-hero h1{
    font-size:clamp(1.7rem,3.6vw,2.5rem);font-weight:700;color:var(--ink-900);line-height:1.3;
    max-width:760px;letter-spacing:-.01em;
  }
  .hero-lead{margin-top:16px;font-size:17px;color:var(--ink-700);max-width:680px;}
  .hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px;}

  /* ---------- 板块 ---------- */
  .sec{padding:96px 0;}
  .sec-white{background:#fff;}
  .sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:36px;}
  .sec-title{
    position:relative;padding-left:16px;font-size:clamp(1.375rem,2.6vw,1.875rem);
    font-weight:650;color:var(--ink-900);line-height:1.35;
  }
  .sec-title::before{
    content:"";position:absolute;left:0;top:.24em;bottom:.24em;width:4px;border-radius:2px;background:var(--brand-700);
  }
  .sec-sub{margin-top:10px;font-size:15px;color:var(--ink-500);max-width:640px;}

  /* ---------- 三条高频问答 ---------- */
  .qa-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
  .qa-card{
    background:var(--card);border:1px solid var(--line);border-radius:var(--r-card);
    padding:28px 26px;display:flex;flex-direction:column;gap:14px;
    transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease),border-color var(--dur) var(--ease);
  }
  .qa-card:hover{transform:translateY(-2px);box-shadow:var(--sh-2);border-color:#D5E1EA;}
  .qa-num{
    display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:9px;
    background:var(--brand-100);color:var(--brand-700);font-size:14px;font-weight:700;
  }
  .qa-card h3{font-size:1.0625rem;font-weight:600;color:var(--ink-900);line-height:1.55;}
  .qa-card p{font-size:14.5px;color:var(--ink-700);}

  /* ---------- 横向滚动卡 ---------- */
  .rail{
    display:flex;gap:20px;overflow-x:auto;scroll-snap-type:x mandatory;
    padding:4px 4px 18px;margin:0 -4px;
  }
  .rail::-webkit-scrollbar{height:6px;}
  .rail::-webkit-scrollbar-track{background:var(--line);border-radius:999px;}
  .rail::-webkit-scrollbar-thumb{background:#B9CBD8;border-radius:999px;}
  .rail-card{
    flex:0 0 300px;scroll-snap-align:start;background:var(--card);border:1px solid var(--line);
    border-radius:var(--r-card);overflow:hidden;display:flex;flex-direction:column;
    transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
  }
  .rail-card:hover{transform:translateY(-2px);box-shadow:var(--sh-2);}
  .rail-media{position:relative;aspect-ratio:16/9;background:var(--brand-100);overflow:hidden;}
  .rail-media img{width:100%;height:100%;object-fit:cover;}
  .rail-body{padding:20px 22px 22px;display:flex;flex-direction:column;gap:10px;flex:1;}
  .rail-body h3{font-size:1.0625rem;font-weight:600;color:var(--ink-900);}
  .rail-body p{font-size:14px;color:var(--ink-500);flex:1;}
  .rail-hint{font-size:13px;color:var(--ink-500);margin-top:4px;}

  /* ---------- 排查清单 ---------- */
  .check-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;}
  .check-card{
    background:var(--card);border:1px solid var(--line);border-radius:var(--r-card);padding:26px 26px 18px;
    transition:box-shadow var(--dur) var(--ease);
  }
  .check-card:hover{box-shadow:var(--sh-1);}
  .check-card h3{
    font-size:1.0625rem;font-weight:600;color:var(--ink-900);padding-bottom:14px;border-bottom:1px solid var(--line);
  }
  .check-row{
    display:flex;align-items:flex-start;gap:12px;padding:15px 0;border-bottom:1px dashed var(--line);
    font-size:14.5px;color:var(--ink-700);
  }
  .check-row:last-child{border-bottom:0;}
  .tick{
    position:relative;flex:0 0 18px;width:18px;height:18px;margin-top:3px;border-radius:6px;background:var(--brand-100);
  }
  .tick::after{
    content:"";position:absolute;left:5px;top:4px;width:7px;height:4px;border-left:2px solid var(--brand-700);
    border-bottom:2px solid var(--brand-700);transform:rotate(-45deg);
  }
  .check-note{
    margin-top:18px;padding:16px 18px;border-radius:12px;background:var(--brand-100);
    font-size:14px;color:var(--brand-700);line-height:1.8;
  }

  /* ---------- FAQ ---------- */
  .faq{max-width:800px;margin:0 auto;}
  .faq-item{border-bottom:1px solid var(--line);}
  .faq-item:first-child{border-top:1px solid var(--line);}
  .faq-q{
    width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
    min-height:56px;padding:16px 0;background:none;border:0;text-align:left;cursor:pointer;
    font-size:16px;font-weight:600;color:var(--ink-900);line-height:1.6;
    transition:color var(--dur) var(--ease);
  }
  .faq-q:hover{color:var(--brand-700);}
  .faq-icon{position:relative;flex:0 0 20px;width:20px;height:20px;transition:transform var(--dur) var(--ease);}
  .faq-icon::before,.faq-icon::after{
    content:"";position:absolute;background:var(--brand-700);border-radius:2px;
  }
  .faq-icon::before{left:0;top:9px;width:20px;height:2px;}
  .faq-icon::after{left:9px;top:0;width:2px;height:20px;}
  .faq-item.is-open .faq-icon{transform:rotate(45deg);}
  .faq-a{
    display:none;background:#F6F8FA;border-radius:10px;padding:20px;margin-bottom:18px;
    font-size:14px;line-height:1.85;color:var(--ink-700);
  }
  .faq-a p+p{margin-top:10px;}
  .faq-item.is-open .faq-a{display:block;}

  /* ---------- 支持信息 ---------- */
  .support-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:24px;}
  .support-card{
    background:var(--card);border:1px solid var(--line);border-radius:var(--r-card);padding:28px;
  }
  .support-card h3{font-size:1.0625rem;font-weight:600;color:var(--ink-900);margin-bottom:12px;}
  .support-card p{font-size:14.5px;}
  .support-list li{
    display:flex;gap:10px;padding:12px 0;border-bottom:1px dashed var(--line);font-size:14.5px;
  }
  .support-list li:last-child{border-bottom:0;}
  .dot{flex:0 0 6px;width:6px;height:6px;border-radius:999px;background:var(--brand-700);margin-top:11px;}
  .support-mail{
    display:inline-flex;align-items:center;gap:8px;margin-top:14px;font-size:15px;font-weight:600;color:var(--brand-700);
  }
  .support-mail:hover{color:var(--brand-600);}

  /* ---------- 底部收口 ---------- */
  .cta-strip{
    background:var(--brand-100);border-radius:var(--r-block);padding:48px;
    display:flex;align-items:center;justify-content:space-between;gap:32px;
  }
  .cta-strip h2{font-size:clamp(1.25rem,2.2vw,1.6rem);font-weight:650;color:var(--ink-900);}
  .cta-strip p{margin-top:10px;font-size:15px;color:var(--ink-700);max-width:560px;}
  .cta-actions{display:flex;flex-wrap:wrap;gap:14px;flex:0 0 auto;}

  /* ---------- 页脚 ---------- */
  .site-foot{margin-top:96px;border-top:1px solid var(--line);background:var(--bg);padding:56px 0 24px;}
  .foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px;}
  .foot-title{font-size:14px;font-weight:600;color:var(--ink-900);margin-bottom:14px;}
  .foot-links a{display:block;font-size:14px;color:var(--ink-500);padding:6px 0;}
  .foot-links a:hover{color:var(--brand-700);}
  .muted{color:var(--ink-500);font-size:14px;}
  .foot-bottom{
    display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;
    margin-top:40px;padding-top:20px;border-top:1px solid var(--line);font-size:12px;color:var(--ink-500);
  }

  /* ---------- 响应式 ---------- */
  @media (max-width:1279px){
    .rail-card{flex:0 0 280px;}
  }
  @media (max-width:1023px){
    .wrap{padding:0 24px;}
    .nav-links{display:none;}
    .head-actions{margin-left:auto;}
    .nav-toggle{display:inline-flex;}
    body.nav-open .mobile-nav{display:block;}
    body.nav-open{overflow:hidden;}
    .sec{padding:72px 0;}
    .qa-grid{grid-template-columns:1fr 1fr;}
    .check-grid{grid-template-columns:1fr;}
    .support-grid{grid-template-columns:1fr;}
    .foot-grid{grid-template-columns:1fr 1fr;}
    .site-foot{margin-top:72px;}
    .cta-strip{flex-direction:column;align-items:flex-start;padding:36px;}
    .cta-actions{width:100%;}
  }
  @media (max-width:767px){
    .wrap{padding:0 20px;}
    .head-inner{height:60px;gap:16px;}
    .nav-link{height:60px;}
    .site-head .btn-sm{display:none;}
    .cat-hero{min-height:220px;padding:32px 0 28px;}
    .hero-lead{font-size:15.5px;}
    .sec{padding:56px 0;}
    .qa-grid{grid-template-columns:1fr;}
    .sec-head{flex-direction:column;align-items:flex-start;gap:14px;margin-bottom:26px;}
    .rail{scroll-snap-type:x proximity;}
    .rail-card{flex:0 0 82%;}
    .faq-q{font-size:15.5px;}
    .cta-actions .btn{width:100%;}
    .foot-grid{grid-template-columns:1fr;gap:26px;}
    .foot-bottom{flex-direction:column;align-items:flex-start;gap:6px;}
    .site-foot{padding:44px 0 20px;}
  }
  @media (max-width:479px){
    .cat-hero h1{font-size:1.5rem;}
    .rail-card{flex:0 0 88%;}
    .cta-strip{padding:28px 22px;}
  }