/* roulang page: index */
:root {
      --color-primary: #2E6A4E;
      --color-accent: #F27A3E;
      --color-bg: #F5F2ED;
      --color-dark: #1C1C1C;
      --color-text: #2C2C2C;
      --color-muted: #6B6B6B;
      --color-card-bg: #FFFFFF;
      --color-border: #DCE5E0;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 8px 30px rgba(0,0,0,0.08);
      --font-head: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-body: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      --transition: 0.25s cubic-bezier(0.2, 0.0, 0, 1.0);
    }
    * { margin:0; padding:0; box-sizing:border-box; }
    body {
      font-family: var(--font-body);
      color: var(--color-text);
      background: var(--color-bg);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    h1, h2, h3, .font-head {
      font-family: var(--font-head);
      font-weight: 600;
    }
    h1 {
      font-size: clamp(36px, 6vw, 48px);
      font-weight: 700;
      line-height: 1.3;
    }
    h2 {
      font-size: clamp(26px, 5vw, 32px);
      font-weight: 600;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 20px;
      font-weight: 600;
    }
    .text-accent {
      color: var(--color-accent);
    }
    .text-muted {
      color: var(--color-muted);
    }
    .number-font {
      font-feature-settings: "tnum";
      font-weight: 700;
    }
    /* ---------- navigation ---------- */
    #nav {
      position: fixed;
      top:0; left:0; width:100%;
      z-index: 1000;
      background: transparent;
      transition: background 0.3s, box-shadow 0.3s;
      backdrop-filter: blur(6px);
    }
    #nav.scrolled {
      background: rgba(255,255,255,0.96);
      box-shadow: 0 4px 20px rgba(0,0,0,0.06);
      backdrop-filter: blur(12px);
    }
    .nav-inner {
      display:flex;
      align-items:center;
      justify-content:space-between;
      height:72px;
    }
    .logo {
      font-family: var(--font-head);
      font-weight: 700;
      font-size:24px;
      color: var(--color-dark);
      text-decoration:none;
      letter-spacing: -0.5px;
      display:flex;
      align-items:center;
      gap:8px;
      transition: color 0.2s;
    }
    .nav-links { display:flex; gap:32px; align-items:center; }
    .nav-links a {
      font-weight:500;
      text-decoration:none;
      color: var(--color-text);
      font-size:16px;
      position:relative;
      padding: 8px 0;
      white-space: nowrap;
    }
    .nav-links a::after {
      content: '';
      position:absolute;
      bottom:0; left:0; width:0;
      height:2px;
      background: var(--color-accent);
      transition: width 0.2s;
    }
    .nav-links a:hover::after,
    .nav-links a.active-nav::after { width:100%; }
    /* Moon/CON menu hack: desktop hidden checkbox*/
    #menu-toggle { display:none; }
    .hamburger { display:none; cursor:pointer; flex-direction:column; gap:6px; }
    .hamburger span { display:block; width:24px; height:2px; background:var(--color-dark); transition:0.2s; border-radius:2px;}

    /* Hero */
    #hero {
      padding:160px 0 100px;
      min-height:80vh;
      display:flex;
      align-items:center;
      background: linear-gradient(120deg, rgba(46,106,78,0.08) 0%, rgba(245,242,237,0.9) 70%);
      backdrop-filter: blur(3px);
    }
    .hero-grid {
      display:grid;
      grid-template-columns: 1fr 360px;
      gap:60px;
      align-items:center;
    }
    .hero-desc {
      font-size:18px;
      color: var(--color-muted);
      max-width:520px;
      margin: 16px 0 32px;
    }
    .hero-cards {
      display:flex;
      flex-direction:column;
      gap:16px;
    }
    .micro-card {
      background: rgba(245,242,237,0.7);
      backdrop-filter: blur(8px);
      border-radius:16px;
      padding:16px 20px;
      box-shadow: 0 4px 18px rgba(0,0,0,0.03);
      display:flex;
      align-items:center;
      gap:14px;
      transition: transform 0.2s;
      border:1px solid rgba(220,229,224,0.8);
    }
    .micro-card:hover { transform: translateY(-2px); }
    /* buttons */
    .btn {
      display:inline-flex;
      align-items:center;
      justify-content:center;
      font-weight:600;
      border-radius: var(--radius-btn);
      transition: all 0.2s;
      cursor:pointer;
      text-decoration:none;
      border:none;
      padding:14px 32px;
      font-size:16px;
    }
    .btn-primary {
      background: var(--color-primary);
      color:white;
    }
    .btn-primary:hover {
      background: #1F4D38;
      transform: translateY(-2px);
      box-shadow: 0 12px 28px rgba(0,0,0,0.15);
    }
    .btn-outline {
      background: transparent;
      border:1.5px solid var(--color-primary);
      color:var(--color-primary);
    }
    .btn-outline:hover { background: rgba(46,106,78,0.06); }
    .btn-accent {
      background: var(--color-accent);
      color: white;
      font-weight:600;
    }
    .btn-accent:hover { background:#e06a2c; transform: translateY(-2px); }
    .cta-link {
      color: var(--color-accent);
      font-weight:600;
      text-decoration:none;
      border-bottom: transparent 1.5px solid;
      transition: border-color 0.15s;
    }
    .cta-link:hover { border-color: var(--color-accent); }

    /* sections spacing */
    section { padding: 100px 0; }
    .section-title { margin-bottom: 40px; text-align:center; }

    /* metrics */
    .metrics-grid {
      display:grid;
      grid-template-columns: repeat(4,1fr);
      gap:32px;
    }
    .metric-card {
      background: var(--color-card-bg);
      border-radius: var(--radius-card);
      padding:32px 24px;
      box-shadow: var(--shadow-card);
      text-align:center;
    }
    .metric-number {
      font-size: 48px;
      font-weight:700;
      color: var(--color-primary);
      letter-spacing: -0.5px;
    }
    .progress-bar {
      width:100%;
      height:6px;
      background:var(--color-border);
      border-radius:8px;
      margin: 16px 0 8px;
      overflow:hidden;
    }
    .progress-fill {
      height:100%;
      background: var(--color-accent);
      width:0%;
      border-radius:8px;
      transition: width 1.5s ease-out;
    }

    /* services grid */
    .services-grid {
      display:grid;
      grid-template-columns: repeat(3,1fr);
      gap:28px;
    }
    .service-card {
      background: var(--color-card-bg);
      border-radius: var(--radius-card);
      overflow:hidden;
      box-shadow: var(--shadow-card);
      transition: transform var(--transition), box-shadow var(--transition);
      display:flex;
      flex-direction:column;
    }
    .service-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-card-hover); }
    .service-img { width:100%; height:220px; object-fit:cover; display:block; }
    .service-body { padding:24px 28px 28px; flex:1; display:flex; flex-direction:column; }
    .service-body p { color:var(--color-muted); margin:10px 0 18px; flex:1; }

    /* compare */
    .compare-grid {
      display:grid;
      grid-template-columns: repeat(3,1fr);
      gap:24px;
    }
    .compare-card {
      background: white;
      border-radius:20px;
      padding:36px 28px;
      box-shadow: var(--shadow-card);
      border:2px solid var(--color-border);
      display:flex;
      flex-direction:column;
      transition: 0.2s;
    }
    .compare-card.featured {
      border-color: var(--color-accent);
      position:relative;
    }
    .popular-tag {
      position:absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--color-accent);
      color: white;
      padding:5px 20px;
      border-radius:20px;
      font-weight:700;
      font-size:14px;
      letter-spacing:0.5px;
    }
    .compare-name { font-size:24px; font-weight:700; }
    .compare-price { font-size:40px; font-weight:700; color:var(--color-primary); margin:16px 0; }
    .compare-list { list-style:none; margin:20px 0 32px; flex:1; }
    .compare-list li { padding:12px 0; border-bottom:1px solid var(--color-border); display:flex; justify-content:space-between; }

    /* cases horizontal scroll */
    .cases-scroll {
      display:flex;
      gap:24px;
      overflow-x:auto;
      scroll-snap-type: x mandatory;
      padding: 8px 0 24px;
      -webkit-overflow-scrolling: touch;
      scrollbar-width: thin;
    }
    .case-card {
      flex:0 0 340px;
      scroll-snap-align: start;
      border-radius: var(--radius-card);
      overflow:hidden;
      position:relative;
      background:var(--color-dark);
      min-height:240px;
      transition: transform 0.25s;
    }
    .case-card img { width:100%; height:240px; object-fit:cover; opacity:0.8; }
    .case-caption {
      position:absolute;
      bottom:0; left:0; right:0;
      background: linear-gradient(transparent, rgba(0,0,0,0.75));
      color:white;
      padding: 50px 20px 20px;
    }
    .case-label { font-size:14px; color:#ddd; display:flex; gap:16px; margin-top:6px; }

    /* faq accordion */
    .faq-grid {
      display:grid;
      grid-template-columns: 1fr 1fr;
      gap:24px;
      align-items:start;
    }
    .faq-item { background:white; border-radius:12px; padding:18px 24px; box-shadow: 0 2px 12px rgba(0,0,0,0.02); transition:0.2s; }
    .faq-question { font-weight:700; cursor:pointer; display:flex; justify-content:space-between; align-items:center; user-select:none; }
    .faq-answer { max-height:0; overflow:hidden; transition: max-height 0.35s ease; color:var(--color-muted); margin-top:0; }
    .faq-item.open .faq-answer { max-height:200px; margin-top:14px; }
    .arrow { transition: transform 0.35s; font-size:18px; color:var(--color-primary); }
    .faq-item.open .arrow { transform: rotate(180deg); }

    /* contact */
    #contact {
      background: var(--color-dark);
      color:white;
    }
    .contact-inner {
      display:flex;
      flex-wrap:wrap;
      gap:36px;
      align-items:center;
      justify-content:space-between;
    }
    .contact-form { display:flex; gap:16px; flex-wrap:wrap; }
    .contact-form input {
      background: rgba(255,255,255,0.08);
      border:1px solid rgba(255,255,255,0.2);
      padding:14px 18px;
      border-radius: var(--radius-input);
      color:white;
      min-width:200px;
      font-size:16px;
    }
    .contact-form input::placeholder { color:rgba(255,255,255,0.5); }

    footer {
      background:var(--color-dark);
      color: rgba(255,255,255,0.7);
      padding:40px 0;
    }
    .footer-grid { display:flex; justify-content:space-between; flex-wrap:wrap; gap:32px; }

    @media (max-width:1024px) {
      .hero-grid { grid-template-columns:1fr; }
      .metrics-grid { grid-template-columns: repeat(2,1fr); }
      .services-grid { grid-template-columns: repeat(2,1fr); }
      .compare-grid { grid-template-columns:1fr; max-width:480px; margin:0 auto; }
      .faq-grid { grid-template-columns:1fr; }
    }
    @media (max-width:768px) {
      .nav-links { display:none; position:fixed; top:72px; left:0; width:100%; background:white; flex-direction:column; gap:18px; padding:32px; box-shadow: 0 20px 30px rgba(0,0,0,0.1); }
      #menu-toggle:checked ~ .nav-links { display:flex; }
      .hamburger { display:flex; }
      .metrics-grid { grid-template-columns:1fr; }
      .services-grid { grid-template-columns:1fr; }
      .contact-inner { flex-direction:column; align-items:flex-start; }
      .contact-form { flex-direction:column; width:100%; }
    }