/* roulang page: index */
:root {
      --primary-cyan: #00E5FF;
      --primary-cyan-hover: #33EAFF;
      --accent-violet: #7C3AED;
      --bg-deep: #0A0E17;
      --bg-footer: #060A10;
      --surface-glass: rgba(15, 20, 30, 0.7);
      --border-glass: rgba(255, 255, 255, 0.08);
      --border-active: rgba(0, 229, 255, 0.4);
      --text-primary: #F0F3FA;
      --text-secondary: #8892A6;
      --text-muted: #B0B8C9;
      --shadow-glow: 0 0 18px rgba(0, 229, 255, 0.5);
      --shadow-glow-hover: 0 0 30px rgba(0, 229, 255, 0.8);
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-card-hover: 0 12px 40px rgba(0, 229, 255, 0.15);
      --border-radius-card: 16px;
      --border-radius-btn: 30px;
      --border-radius-input: 12px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --spacing-section: 120px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      background-color: var(--bg-deep);
      font-family: var(--font-sans);
      color: var(--text-primary);
      margin: 0;
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    /* 浮动 Dock 导航 */
    .navbar-custom {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      z-index: 1030;
      width: auto;
      max-width: 1100px;
      background: rgba(10, 14, 23, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--border-glass);
      border-radius: 50px;
      padding: 8px 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: 0 8px 20px rgba(0,0,0,0.5);
    }

    .nav-logo {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary-cyan);
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .nav-logo i {
      font-size: 1.8rem;
      color: var(--primary-cyan);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-secondary);
      font-size: 0.95rem;
      transition: 0.2s;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-cyan);
    }
    .nav-cta {
      background: transparent;
      border: 1px solid var(--primary-cyan);
      color: var(--primary-cyan);
      padding: 8px 20px;
      border-radius: var(--border-radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      transition: 0.25s;
    }
    .nav-cta:hover {
      background: rgba(0,229,255,0.15);
      box-shadow: var(--shadow-glow);
      color: white;
    }
    .nav-toggle {
      display: none;
      background: transparent;
      border: none;
      color: var(--primary-cyan);
      font-size: 1.8rem;
    }

    /* 容器覆盖 */
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    section {
      padding: var(--spacing-section) 0;
    }

    h1 {
      font-weight: 700;
      font-size: 3rem;
      letter-spacing: 0.02em;
    }
    h2 {
      font-weight: 600;
      font-size: 2.2rem;
      margin-bottom: 1.5rem;
      position: relative;
      display: inline-block;
    }
    h2::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 60px;
      height: 4px;
      background: linear-gradient(90deg, var(--primary-cyan), transparent);
      border-radius: 2px;
    }
    h3 {
      font-weight: 600;
      font-size: 1.25rem;
    }
    .text-muted-custom {
      color: var(--text-muted);
    }

    /* 玻璃拟态卡片 */
    .glass-card {
      background: var(--surface-glass);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--border-glass);
      border-radius: var(--border-radius-card);
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
    }
    .glass-card:hover {
      transform: translateY(-4px);
      border-color: var(--border-active);
      box-shadow: var(--shadow-card-hover);
    }

    .btn-primary-glow {
      background: var(--primary-cyan);
      color: var(--bg-deep);
      border: none;
      font-weight: 600;
      letter-spacing: 0.05em;
      border-radius: var(--border-radius-btn);
      padding: 12px 32px;
      box-shadow: var(--shadow-glow);
      transition: 0.25s;
    }
    .btn-primary-glow:hover {
      background: var(--primary-cyan-hover);
      box-shadow: var(--shadow-glow-hover);
      color: #000;
    }
    .btn-outline-cyan {
      background: transparent;
      border: 1px solid var(--primary-cyan);
      color: var(--primary-cyan);
      font-weight: 600;
      border-radius: var(--border-radius-btn);
      padding: 12px 32px;
      transition: 0.25s;
    }
    .btn-outline-cyan:hover {
      background: rgba(0,229,255,0.1);
      color: white;
      border-color: var(--primary-cyan-hover);
    }

    /* Hero 区域 */
    .hero-img-container {
      border-radius: 16px;
      border: 1px solid var(--border-glass);
      background: rgba(0,0,0,0.3);
      backdrop-filter: blur(4px);
      position: relative;
      overflow: hidden;
    }
    .play-icon {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      font-size: 3.5rem;
      color: var(--primary-cyan);
      opacity: 0.9;
      text-shadow: 0 0 20px black;
      animation: pulse-ring 2s infinite;
    }
    @keyframes pulse-ring {
      0% { text-shadow: 0 0 10px rgba(0,229,255,0.7); }
      50% { text-shadow: 0 0 25px rgba(0,229,255,1); }
      100% { text-shadow: 0 0 10px rgba(0,229,255,0.7); }
    }

    /* 亮点网格 */
    .feature-icon {
      font-size: 2.5rem;
      color: var(--primary-cyan);
      margin-bottom: 1rem;
    }

    /* 案例瀑布流 */
    .masonry-grid {
      column-count: 3;
      column-gap: 24px;
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 24px;
      position: relative;
      border-radius: var(--border-radius-card);
      overflow: hidden;
      background: #0b1018;
      transition: transform 0.3s;
    }
    .masonry-item img {
      width: 100%;
      object-fit: cover;
      display: block;
    }
    .masonry-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(to top, rgba(0,0,0,0.85), transparent);
      padding: 24px 16px 16px;
      color: white;
    }
    .tag-badge {
      background: var(--primary-cyan);
      color: #000;
      font-size: 0.7rem;
      font-weight: 600;
      padding: 2px 8px;
      border-radius: 12px;
    }

    /* 对比卡片 */
    .compare-card-traditional {
      border: 1px solid #2A2F3A;
      background: rgba(20,25,35,0.6);
    }
    .compare-card-wm {
      border: 1px solid var(--primary-cyan);
      box-shadow: 0 0 25px rgba(0,229,255,0.25);
      background: rgba(0,229,255,0.03);
    }

    /* FAQ */
    .faq-item {
      background: var(--surface-glass);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-glass);
      border-radius: 12px;
      margin-bottom: 12px;
      cursor: pointer;
    }
    .faq-question {
      padding: 20px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      padding: 0 20px 20px;
      color: var(--text-muted);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
      animation: fadeIn 0.3s ease;
    }
    @keyframes fadeIn { from {opacity:0;} to {opacity:1;} }

    /* 联系表单 */
    .form-glass {
      background: rgba(20,28,40,0.55);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: var(--border-radius-input);
      color: white;
      padding: 12px 16px;
      width: 100%;
    }
    .form-glass:focus {
      border-color: var(--primary-cyan);
      box-shadow: 0 0 10px rgba(0,229,255,0.3);
      outline: none;
    }

    footer {
      background: var(--bg-footer);
      padding: 60px 0 30px;
    }

    /* 响应式 */
    @media (max-width: 992px) {
      h1 { font-size: 2.2rem; }
      .navbar-custom { padding: 8px 20px; width: 95%; }
      .nav-links { gap: 16px; }
      .masonry-grid { column-count: 2; }
    }
    @media (max-width: 768px) {
      :root { --spacing-section: 80px; }
      .navbar-custom { flex-wrap: wrap; }
      .nav-links { display: none; width: 100%; flex-direction: column; gap: 12px; margin-top: 12px; }
      .nav-links.show { display: flex; }
      .nav-toggle { display: block; }
      .masonry-grid { column-count: 1; }
      h2 { font-size: 1.8rem; }
    }
    @media (max-width: 520px) {
      h1 { font-size: 1.9rem; }
      .nav-cta { padding: 6px 16px; }
    }