/* roulang page: index */
:root {
      --copper: #C45C26;
      --copper-dark: #9A471C;
      --porcelain: #2F6F6A;
      --arc: #1F7A72;
      --graphite: #1C2429;
      --cabinet: #2A3338;
      --paper: #F3F0E8;
      --mist: #E7EEEC;
      --white: #FBFBFA;
      --amber: #D9A441;
      --ink: #1A1F22;
      --muted: #5C676C;
      --line: #D8D3C6;
      --radius: 8px;
      --shadow: 2px 3px 0 rgba(28, 36, 41, 0.12);
      --shadow-hover: 3px 6px 0 rgba(196, 92, 38, 0.18);
      --space: 88px;
      --container: 1240px;
      --topbar-h: 38px;
      --nav-h: 72px;
    }
    *, *::before, *::after { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      font-family: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      font-size: 16px;
      line-height: 1.75;
      color: var(--ink);
      background: var(--paper);
      letter-spacing: 0.01em;
    }
    img { max-width: 100%; height: auto; display: block; }
    a { color: var(--porcelain); text-decoration: none; }
    a:hover { color: var(--copper); }
    button, input, select, textarea { font-family: inherit; }
    button { cursor: pointer; }
    h1, h2, h3, h4 { margin: 0; letter-spacing: -0.03em; line-height: 1.28; color: var(--graphite); }
    p { margin: 0; }
    ul, ol { margin: 0; padding: 0; }
    .container { width: min(var(--container), calc(100% - 48px)); margin: 0 auto; }
    .skip {
      position: absolute; left: -999px; top: 0;
      background: var(--copper); color: #fff; padding: 8px 14px; z-index: 100;
    }
    .skip:focus { left: 12px; top: 12px; }
    .num { font-variant-numeric: tabular-nums; letter-spacing: -0.04em; }
    .badge {
      display: inline-flex; align-items: center; gap: 6px;
      padding: 4px 10px; border-radius: 6px;
      background: rgba(217, 164, 65, 0.16); color: #7A5A16;
      font-size: 12px; font-weight: 600; letter-spacing: 0.04em;
    }
    .btn {
      display: inline-flex; align-items: center; justify-content: center;
      min-height: 44px; padding: 10px 20px; border-radius: 8px;
      border: 1px solid transparent; font-size: 15px; font-weight: 600;
      transition: transform .18s ease, background .18s ease, color .18s ease, border-color .18s ease;
    }
    .btn:focus-visible, .icon-btn:focus-visible, .nav-links a:focus-visible, .quiz-opt:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
      outline: 2px solid var(--arc);
      outline-offset: 2px;
    }
    .btn-primary { background: var(--copper); color: #fff; }
    .btn-primary:hover { background: var(--porcelain); color: #fff; transform: translateY(-2px); }
    .btn-primary:active { transform: translateY(0); background: var(--cabinet); }
    .btn-ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,.45); }
    .btn-ghost:hover { background: #fff; color: var(--graphite); }
    .btn-line { background: transparent; color: var(--graphite); border-color: var(--cabinet); }
    .btn-line:hover { background: var(--graphite); color: #fff; transform: translateY(-2px); }
    .site-header { position: relative; z-index: 80; }
    .topbar {
      background: var(--graphite); color: #D6DDD9; font-size: 12px; height: var(--topbar-h);
      display: flex; align-items: center; transition: transform .25s ease;
    }
    .topbar .container { display: flex; justify-content: space-between; align-items: center; gap: 16px; }
    .topbar-left, .topbar-right { display: flex; gap: 18px; align-items: center; flex-wrap: wrap; }
    .topbar a { color: #E7EEEC; }
    .topbar a:hover { color: var(--amber); }
    .site-header.is-compact .topbar { transform: translateY(-100%); position: absolute; width: 100%; }
    .nav-main {
      background: var(--mist);
      border-bottom: 1px solid #D3DDDA;
      min-height: var(--nav-h);
    }
    .site-header.is-stuck .nav-main {
      position: sticky; top: 0; z-index: 90;
      box-shadow: 0 2px 0 rgba(28,36,41,.08);
    }
    .nav-inner { display: flex; align-items: center; gap: 20px; min-height: var(--nav-h); }
    .logo {
      display: flex; align-items: center; gap: 10px; color: var(--graphite); font-weight: 800; white-space: nowrap;
    }
    .logo svg { flex-shrink: 0; }
    .logo:hover { color: var(--copper); }
    .nav-links { display: flex; align-items: center; gap: 4px; margin-left: auto; list-style: none; }
    .nav-links a {
      display: block; padding: 8px 10px; color: var(--cabinet); font-size: 14px; font-weight: 600;
      border-radius: 6px;
    }
    .nav-links a:hover, .nav-links a.is-active { color: var(--copper); background: rgba(196,92,38,.08); }
    .nav-cta { margin-left: 8px; }
    .hamburger {
      display: none; width: 44px; height: 44px; border: 1px solid var(--cabinet); background: #fff; border-radius: 8px;
      align-items: center; justify-content: center; flex-direction: column; gap: 5px;
    }
    .hamburger span { width: 18px; height: 2px; background: var(--graphite); display: block; }
    .drawer {
      position: fixed; inset: 0 0 0 auto; width: min(360px, 92vw); background: var(--white);
      transform: translateX(100%); transition: transform .24s ease; z-index: 120;
      border-left: 2px solid var(--copper); padding: 24px; overflow: auto;
    }
    .drawer.is-open { transform: translateX(0); }
    .drawer-mask {
      position: fixed; inset: 0; background: rgba(28,36,41,.46); opacity: 0; pointer-events: none;
      transition: opacity .24s ease; z-index: 110;
    }
    .drawer-mask.is-open { opacity: 1; pointer-events: auto; }
    .drawer nav { display: flex; flex-direction: column; gap: 6px; margin: 24px 0; }
    .drawer nav a { padding: 12px 10px; color: var(--graphite); font-weight: 700; border-bottom: 1px solid var(--line); }
    body.menu-lock { overflow: hidden; }
    .hero { position: relative; min-height: 720px; color: #fff; overflow: hidden; }
    .slides { position: absolute; inset: 0; }
    .slide {
      position: absolute; inset: 0; opacity: 0; transition: opacity .6s ease;
      background-size: cover; background-position: center;
    }
    .slide.is-active { opacity: 1; }
    .slide::after {
      content: ""; position: absolute; inset: 0;
      background: linear-gradient(90deg, rgba(28,36,41,.88) 0%, rgba(28,36,41,.62) 42%, rgba(28,36,41,.28) 100%);
    }
    .hero-grid {
      position: absolute; inset: 0; pointer-events: none; opacity: .18;
      background-image: linear-gradient(rgba(255,255,255,.16) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.16) 1px, transparent 1px);
      background-size: 48px 48px;
    }
    .hero-content { position: relative; z-index: 2; padding: 72px 0 88px; }
    .hero-layout { display: grid; grid-template-columns: 1.15fr .85fr; gap: 32px; align-items: stretch; }
    .hero-copy { max-width: 640px; padding: 18px 0 8px; }
    .hero h1 { color: #fff; font-size: 42px; font-weight: 800; margin: 14px 0 18px; }
    .hero-lead { color: #E7EEEC; font-size: 16px; line-height: 1.8; margin-bottom: 22px; }
    .hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
    .hero-meta { display: flex; gap: 22px; margin-top: 28px; padding-top: 18px; border-top: 1px solid rgba(217,164,65,.35); }
    .hero-meta b { display: block; color: var(--amber); font-size: 22px; }
    .hero-meta span { color: #C9D4D0; font-size: 13px; }
    .quiz {
      background: rgba(28,36,41,.72); border: 1px solid rgba(196,92,38,.45);
      border-radius: 10px; padding: 22px; backdrop-filter: none;
    }
    .quiz h3 { color: #fff; font-size: 20px; margin-bottom: 8px; }
    .quiz p { color: #D5DEDB; font-size: 14px; margin-bottom: 14px; }
    .quiz-q { margin-bottom: 12px; }
    .quiz-q span { display: block; color: var(--amber); font-size: 12px; font-weight: 700; margin-bottom: 6px; }
    .quiz-opts { display: flex; flex-wrap: wrap; gap: 8px; }
    .quiz-opt {
      border: 1px solid rgba(255,255,255,.28); background: transparent; color: #fff;
      border-radius: 6px; min-height: 40px; padding: 6px 12px; font-size: 13px;
    }
    .quiz-opt.is-on, .quiz-opt:hover { background: var(--copper); border-color: var(--copper); }
    .quiz-result {
      margin-top: 14px; background: #F3F0E8; color: var(--graphite);
      border-radius: 8px; padding: 14px; min-height: 96px;
    }
    .quiz-result strong { display: block; margin-bottom: 4px; color: var(--copper-dark); }
    .carousel-ui { position: absolute; left: 0; right: 0; bottom: 18px; z-index: 3; }
    .carousel-ui .container { display: flex; align-items: center; gap: 10px; }
    .icon-btn {
      width: 44px; height: 44px; border-radius: 8px; border: 1px solid rgba(255,255,255,.35);
      background: rgba(28,36,41,.45); color: #fff;
    }
    .icon-btn:hover { background: var(--copper); border-color: var(--copper); }
    .dots { display: flex; gap: 8px; margin-left: 8px; }
    .dots button {
      width: 22px; height: 6px; border: 0; border-radius: 2px; background: rgba(255,255,255,.35);
    }
    .dots button.is-on { background: var(--amber); }
    main section { padding: var(--space) 0; position: relative; }
    .sec-kicker { color: var(--copper); font-size: 13px; font-weight: 700; letter-spacing: .12em; margin-bottom: 8px; }
    .sec-title { font-size: 32px; margin-bottom: 14px; }
    .sec-desc { color: var(--muted); max-width: 760px; margin-bottom: 28px; }
    .pain { background: var(--white); }
    .pain-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 28px; }
    .pain-item {
      display: grid; grid-template-columns: 52px 1fr; gap: 12px; padding: 16px 0;
      border-bottom: 1px solid var(--line);
    }
    .pain-item b { color: var(--copper); font-size: 22px; }
    .pain-item h3 { font-size: 18px; margin-bottom: 4px; }
    .pain-item p { color: var(--muted); font-size: 14px; }
    .param-card {
      background: var(--mist); border: 1px solid #D3DDDA; border-radius: 10px; overflow: hidden;
      box-shadow: var(--shadow);
    }
    .param-card img { width: 100%; height: 220px; object-fit: cover; }
    .param-table { width: 100%; border-collapse: collapse; font-size: 14px; }
    .param-table th, .param-table td { padding: 10px 14px; text-align: left; border-top: 1px solid #D3DDDA; }
    .param-table th { width: 38%; color: var(--porcelain); font-weight: 700; background: #FBFBFA; }
    .solution { background: var(--paper); }
    .split { display: grid; grid-template-columns: 1fr 1fr; gap: 36px; align-items: center; }
    .split img { width: 100%; height: 420px; object-fit: cover; border-radius: 10px; box-shadow: var(--shadow); }
    .check-list { list-style: none; margin-top: 16px; display: grid; gap: 10px; }
    .check-list li {
      padding-left: 28px; position: relative; color: var(--cabinet);
    }
    .check-list li::before {
      content: ""; position: absolute; left: 0; top: 8px; width: 14px; height: 14px;
      border: 2px solid var(--copper); border-radius: 2px; background: rgba(196,92,38,.15);
    }
    .advantages { background: var(--mist); }
    .adv-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .adv-card {
      background: var(--white); border: 1px solid #D3DDDA; border-radius: 8px; padding: 22px;
      box-shadow: var(--shadow); transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
    }
    .adv-card:hover { transform: translateY(-3px); border-color: var(--copper); box-shadow: var(--shadow-hover); }
    .adv-card em { display: block; color: var(--amber); font-style: normal; font-weight: 800; margin-bottom: 8px; }
    .adv-card h3 { font-size: 18px; margin-bottom: 8px; }
    .adv-card p { color: var(--muted); font-size: 14px; }
    .products { background: var(--white); }
    .product-stage { display: grid; grid-template-columns: 1.3fr .85fr; grid-template-rows: 1fr 1fr; gap: 16px; }
    .product-card {
      position: relative; overflow: hidden; border-radius: 10px; min-height: 210px; color: #fff;
      border: 1px solid #D3DDDA; box-shadow: var(--shadow);
    }
    .product-card img { width: 100%; height: 100%; object-fit: cover; min-height: 210px; }
    .product-card.feature { grid-row: 1 / span 2; min-height: 460px; }
    .product-card.feature img { min-height: 460px; }
    .product-card figcaption {
      position: absolute; left: 0; right: 0; bottom: 0; padding: 18px;
      background: linear-gradient(180deg, transparent, rgba(28,36,41,.86));
    }
    .product-card h3 { color: #fff; font-size: 22px; margin: 6px 0; }
    .product-card p { color: #D6DDD9; font-size: 14px; }
    .process { background: var(--paper); }
    .steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; }
    .step {
      padding: 22px 18px 22px 0; border-top: 3px solid var(--copper); position: relative;
    }
    .step + .step { padding-left: 18px; }
    .step + .step::before {
      content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 1px; background: var(--line);
    }
    .step b { color: var(--porcelain); display: block; font-size: 13px; margin-bottom: 8px; }
    .step h3 { font-size: 18px; margin-bottom: 8px; }
    .step p { color: var(--muted); font-size: 14px; }
    .scenes {
      background: var(--cabinet) url("/assets/images/a09d0c539a8c86fa.webp") center/cover no-repeat;
      color: #fff;
    }
    .scenes::before {
      content: ""; position: absolute; inset: 0; background: rgba(28,36,41,.78);
    }
    .scenes .container { position: relative; z-index: 1; }
    .scenes .sec-title, .scenes .sec-kicker { color: #fff; }
    .scenes .sec-desc { color: #D5DEDB; }
    .scene-track { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 14px; }
    .scene-card {
      background: rgba(251,251,250,.08); border: 1px solid rgba(217,164,65,.28);
      border-radius: 8px; padding: 20px; min-height: 190px;
    }
    .scene-card:first-child { background: rgba(196,92,38,.18); }
    .scene-card h3 { color: #fff; font-size: 20px; margin-bottom: 8px; }
    .scene-card p { color: #D6DDD9; font-size: 14px; }
    .cases { background: var(--graphite); color: #E7EEEC; }
    .cases .sec-title { color: #fff; }
    .cases .sec-desc { color: #B7C2BE; }
    .case-layout { display: grid; grid-template-columns: 1.1fr .9fr; gap: 24px; }
    .case-main img { width: 100%; height: 360px; object-fit: cover; border-radius: 10px; }
    .case-main h3 { color: #fff; margin: 14px 0 8px; font-size: 24px; }
    .case-side { display: grid; gap: 12px; }
    .case-mini {
      display: grid; grid-template-columns: 120px 1fr; gap: 12px; background: #232C31;
      border-radius: 8px; overflow: hidden; border: 1px solid #354046;
    }
    .case-mini img { width: 120px; height: 100%; object-fit: cover; min-height: 108px; }
    .case-mini h3 { color: #fff; font-size: 16px; margin-bottom: 4px; padding-top: 12px; }
    .case-mini p { color: #B7C2BE; font-size: 13px; padding-right: 12px; }
    .stories { background: var(--white); }
    .story {
      display: grid; grid-template-columns: .9fr 1.1fr; gap: 28px; align-items: stretch;
      border: 1px solid var(--line); border-radius: 10px; overflow: hidden; box-shadow: var(--shadow);
    }
    .story img { width: 100%; height: 100%; object-fit: cover; min-height: 360px; }
    .story-body { padding: 28px 28px 28px 8px; }
    .story-meta { display: flex; gap: 10px; flex-wrap: wrap; margin: 12px 0 18px; }
    .tag { background: var(--mist); color: var(--porcelain); border-radius: 6px; padding: 4px 8px; font-size: 12px; font-weight: 700; }
    .stats { background: var(--paper); }
    .stat-bar {
      display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line);
      border: 1px solid var(--line); border-radius: 10px; overflow: hidden;
    }
    .stat-item { background: var(--white); padding: 28px 20px; }
    .stat-item strong { display: block; font-size: 36px; color: var(--copper); }
    .stat-item span { color: var(--muted); font-size: 14px; }
    .reviews { background: var(--mist); }
    .review-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 16px; }
    .review-card {
      background: var(--white); border-radius: 8px; padding: 22px; border: 1px solid #D3DDDA; box-shadow: var(--shadow);
    }
    .review-card + .review-card { margin-top: 12px; }
    .review-card h3 { font-size: 18px; margin-bottom: 8px; }
    .review-card p { color: var(--muted); font-size: 14px; }
    .review-card .who { margin-top: 12px; color: var(--porcelain); font-size: 13px; font-weight: 700; }
    .news { background: var(--white); }
    .news-head { display: flex; justify-content: space-between; align-items: end; gap: 16px; }
    .news-list { display: grid; gap: 14px; }
    .news-item {
      display: grid; grid-template-columns: 220px 1fr auto; gap: 16px; align-items: center;
      border: 1px solid var(--line); border-radius: 8px; overflow: hidden; background: var(--paper);
      transition: transform .18s ease, border-color .18s ease;
    }
    .news-item:hover { transform: translateY(-2px); border-color: var(--copper); }
    .news-item img { width: 220px; height: 132px; object-fit: cover; }
    .news-item h3 { font-size: 18px; margin-bottom: 6px; }
    .news-item p { color: var(--muted); font-size: 14px; }
    .news-date { color: var(--copper); font-weight: 700; padding-right: 18px; white-space: nowrap; }
    .compare { background: var(--paper); }
    .plan-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .plan {
      background: var(--white); border: 1px solid var(--line); border-radius: 8px; padding: 22px;
      box-shadow: var(--shadow);
    }
    .plan.featured { border-color: var(--copper); background: #FFF8F2; transform: translateY(-6px); }
    .plan h3 { font-size: 22px; margin: 8px 0; }
    .plan .price { font-size: 28px; color: var(--copper); font-weight: 800; margin-bottom: 10px; }
    .plan ul { list-style: none; display: grid; gap: 8px; margin: 12px 0 18px; color: var(--cabinet); font-size: 14px; }
    .channel {
      margin-top: 22px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px;
      background: var(--cabinet); color: #E7EEEC; border-radius: 10px; padding: 18px;
    }
    .channel h3 { color: var(--amber); font-size: 16px; margin-bottom: 6px; }
    .channel p { color: #C9D4D0; font-size: 14px; }
    .guarantee { background: var(--mist); padding-top: 56px; padding-bottom: 56px; }
    .g-bar { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; }
    .g-item { background: var(--white); border-radius: 8px; padding: 16px; border: 1px solid #D3DDDA; text-align: left; }
    .g-item strong { display: block; color: var(--porcelain); margin-bottom: 4px; }
    .g-item span { color: var(--muted); font-size: 13px; }
    .faq { background: var(--white); }
    .faq-item { border-bottom: 1px solid var(--line); }
    .faq-item button {
      width: 100%; text-align: left; background: none; border: 0; padding: 18px 0;
      font-size: 17px; font-weight: 700; color: var(--graphite); display: flex; justify-content: space-between; gap: 12px;
    }
    .faq-item button::after { content: "+"; color: var(--copper); }
    .faq-item.is-open button::after { content: "–"; }
    .faq-item .ans { display: none; color: var(--muted); padding: 0 0 16px; }
    .faq-item.is-open .ans { display: block; }
    .quote {
      background: var(--graphite) url("/assets/images/58036aefdb651ff3.jpg") center/cover no-repeat;
    }
    .quote::before { content: ""; position: absolute; inset: 0; background: rgba(28,36,41,.86); }
    .quote .container { position: relative; z-index: 1; }
    .quote .sec-title { color: #fff; }
    .quote .sec-desc { color: #D5DEDB; }
    .form {
      display: grid; grid-template-columns: 1fr 1fr; gap: 12px;
      background: var(--white); border-radius: 10px; padding: 22px; box-shadow: var(--shadow);
    }
    .form .full { grid-column: 1 / -1; }
    .form label { display: block; font-size: 13px; font-weight: 700; margin-bottom: 6px; color: var(--cabinet); }
    .form input, .form select, .form textarea {
      width: 100%; border: 1px solid #D3DDDA; border-radius: 8px; min-height: 44px; padding: 10px 12px; background: #FBFBFA;
    }
    .form textarea { min-height: 110px; resize: vertical; }
    .form-msg { display: none; color: var(--porcelain); font-weight: 700; }
    .form-msg.is-on { display: block; }
    .form-err { color: #A33B1A; font-size: 13px; min-height: 18px; }
    .site-footer { background: #161C20; color: #B7C2BE; padding: 56px 0 24px; }
    .foot-grid { display: grid; grid-template-columns: 1.3fr .8fr .9fr; gap: 28px; margin-bottom: 28px; }
    .site-footer h3 { color: #fff; font-size: 16px; margin-bottom: 12px; }
    .site-footer a { color: #D6DDD9; }
    .site-footer a:hover { color: var(--amber); }
    .foot-links { list-style: none; display: grid; gap: 8px; }
    .copy { border-top: 1px solid #2A3338; padding-top: 16px; font-size: 13px; display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
    @media (max-width: 1280px) {
      .hero h1 { font-size: 36px; }
      .product-stage { grid-template-columns: 1.2fr 1fr; }
    }
    @media (max-width: 1024px) {
      :root { --space: 72px; }
      .nav-links { display: none; }
      .nav-cta { display: none; }
      .hamburger { display: inline-flex; margin-left: auto; }
      .hero-layout, .pain-grid, .split, .case-layout, .story, .review-grid, .scene-track { grid-template-columns: 1fr; }
      .product-stage { grid-template-columns: 1fr; }
      .product-card.feature { grid-row: auto; }
      .adv-grid, .plan-grid, .steps, .stat-bar, .channel, .g-bar { grid-template-columns: 1fr 1fr; }
      .news-item { grid-template-columns: 160px 1fr; }
      .news-date { display: none; }
      .foot-grid { grid-template-columns: 1fr 1fr; }
      .hero { min-height: 0; }
      .story-body { padding: 22px; }
    }
    @media (max-width: 768px) {
      :root { --space: 56px; }
      .container { width: min(100% - 32px, var(--container)); }
      .topbar { height: auto; padding: 8px 0; }
      .hero-content { padding: 36px 0 72px; }
      .hero h1 { font-size: 28px; }
      .sec-title { font-size: 26px; }
      .adv-grid, .plan-grid, .steps, .stat-bar, .channel, .g-bar, .form { grid-template-columns: 1fr; }
      .news-item { grid-template-columns: 1fr; }
      .news-item img { width: 100%; height: 180px; }
      .case-mini { grid-template-columns: 1fr; }
      .case-mini img { width: 100%; height: 160px; }
      .foot-grid, .copy { grid-template-columns: 1fr; }
      .hero-meta { flex-wrap: wrap; }
    }
    @media (max-width: 520px) {
      .hero-actions, .topbar-left, .topbar-right { flex-direction: column; align-items: flex-start; }
      .btn { width: 100%; }
      .logo span { font-size: 14px; }
    }
    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
      *, *::before, *::after { transition: none !important; animation: none !important; }
    }