/* roulang page: index */
:root {
      --slate-black: #1A1D23;
      --zhibo-cyan: #0AE5F5;
      --zhibo-cyan-dark: #00C8D4;
      --mist-gray: #F4F6F9;
      --deep-ink: #0B0E14;
      --warm-white: #FAFAFC;
      --electric-purple: #7C3AED;
      --body-text: #1A1D23;
      --text-muted: #5A5E66;
      --border-light: rgba(0,0,0,0.04);
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 28px rgba(0,0,0,0.08);
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      --radius-card: 16px;
      --radius-btn: 40px;
      --transition: 0.3s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--warm-white);
      color: var(--body-text);
      line-height: 1.7;
      font-size: 16px;
      margin: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4, h5, h6 {
      font-weight: 600;
      letter-spacing: -0.02em;
    }
    h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
    }
    h2 {
      font-size: 38px;
      font-weight: 600;
      line-height: 1.3;
    }
    h3 {
      font-size: 26px;
      font-weight: 600;
    }
    .text-muted-custom {
      color: var(--text-muted);
    }
    .section-padding {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      h1 {
        font-size: 32px;
      }
      h2 {
        font-size: 28px;
      }
      h3 {
        font-size: 22px;
      }
      .section-padding {
        padding: 64px 0;
      }
    }
    /* 按钮重置 */
    .btn-primary-custom {
      background-color: var(--zhibo-cyan);
      border: none;
      color: #0B0E14;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      transition: all var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      letter-spacing: 0.5px;
    }
    .btn-primary-custom:hover {
      background-color: #0BD9E8;
      color: #0B0E14;
      transform: scale(1.03);
      box-shadow: 0 8px 20px rgba(10,229,245,0.3);
    }
    .btn-outline-custom {
      background: transparent;
      border: 1.5px solid var(--zhibo-cyan);
      color: var(--zhibo-cyan);
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      transition: all var(--transition);
    }
    .btn-outline-custom:hover {
      background-color: rgba(10,229,245,0.06);
      color: var(--zhibo-cyan-dark);
      border-color: var(--zhibo-cyan-dark);
    }
    /* 导航 */
    .navbar {
      background-color: rgba(26,29,35,0.85);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding: 12px 0;
      transition: all var(--transition);
    }
    .navbar-brand {
      font-weight: 700;
      font-size: 1.8rem;
      letter-spacing: 1px;
      color: #fff;
      display: flex;
      align-items: center;
    }
    .navbar-brand span {
      color: var(--zhibo-cyan);
    }
    .navbar-nav .nav-link {
      color: #ddd;
      font-weight: 500;
      margin: 0 12px;
      padding: 8px 4px;
      transition: color 0.2s;
      position: relative;
    }
    .navbar-nav .nav-link:hover,
    .navbar-nav .nav-link.active {
      color: var(--zhibo-cyan);
    }
    .navbar-nav .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 4px;
      right: 4px;
      height: 2px;
      background-color: var(--zhibo-cyan);
    }
    .navbar-toggler {
      border: none;
      color: white;
    }
    .navbar-toggler-icon {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255,255,255,0.8)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }
    .nav-cta-btn {
      background-color: var(--zhibo-cyan);
      color: #0B0E14;
      border-radius: 40px;
      padding: 10px 24px;
      font-weight: 600;
      margin-left: 16px;
      transition: all 0.3s;
      border: none;
    }
    .nav-cta-btn:hover {
      background-color: #0BD9E8;
      box-shadow: 0 0 15px rgba(10,229,245,0.5);
    }
    /* Hero */
    #hero {
      background-color: var(--slate-black);
      background-image: radial-gradient(circle at 30% 40%, rgba(10,229,245,0.03) 0%, transparent 60%);
      position: relative;
      overflow: hidden;
    }
    .hero-grid-bg {
      position: absolute;
      top:0; left:0; width:100%; height:100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      opacity: 0.08;
      pointer-events: none;
    }
    .hero-visual {
      position: relative;
      height: 400px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .abstract-geo {
      width: 280px;
      height: 280px;
      border: 2px solid rgba(10,229,245,0.25);
      border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
      position: relative;
      animation: floatGeo 4s infinite alternate ease-in-out;
      background: rgba(10,229,245,0.02);
    }
    .abstract-geo::after {
      content: '';
      position: absolute;
      top: 20px; left: 20px;
      width: 100px; height: 100px;
      border: 2px dashed var(--zhibo-cyan);
      border-radius: 50%;
      opacity: 0.5;
    }
    @keyframes floatGeo {
      0% { transform: translateY(0); }
      100% { transform: translateY(-12px); }
    }
    /* 卡片通用 */
    .card-custom {
      background: var(--warm-white);
      border-radius: var(--radius-card);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
    }
    .card-custom:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    /* 价值主张横向布局 */
    .value-item {
      display: flex;
      align-items: flex-start;
      gap: 24px;
      background: white;
      border-radius: 16px;
      padding: 24px;
      border: 1px solid rgba(0,0,0,0.02);
    }
    .value-icon {
      width: 48px;
      height: 48px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 28px;
      color: var(--zhibo-cyan);
    }
    /* 功能标签页 */
    .feature-tab-nav {
      border-right: 1px solid rgba(0,0,0,0.05);
    }
    .feature-tab-link {
      display: block;
      padding: 16px 20px;
      color: var(--text-muted);
      font-weight: 600;
      border-left: 3px solid transparent;
      transition: 0.2s;
      text-decoration: none;
    }
    .feature-tab-link.active {
      color: var(--zhibo-cyan);
      border-left-color: var(--zhibo-cyan);
      background: rgba(10,229,245,0.03);
    }
    /* 场景卡片暗色 */
    .scenario-card {
      background: var(--deep-ink);
      border: 1px solid rgba(255,255,255,0.06);
      border-radius: 16px;
      padding: 28px;
      transition: all 0.3s;
    }
    .scenario-card:hover {
      border-color: var(--zhibo-cyan);
    }
    .badge-purple {
      background: var(--electric-purple);
      color: white;
      font-size: 12px;
      padding: 4px 10px;
      border-radius: 20px;
      font-weight: 500;
    }
    /* 案例竖线 */
    .case-card {
      border-left: 4px solid var(--zhibo-cyan);
      padding-left: 24px;
    }
    /* 价格卡高亮 */
    .pricing-card-highlight {
      border: 2px solid var(--zhibo-cyan);
      position: relative;
    }
    .popular-badge {
      position: absolute;
      top: -12px;
      right: 20px;
      background: var(--electric-purple);
      color: white;
      padding: 4px 16px;
      border-radius: 20px;
      font-size: 0.8rem;
    }
    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: transparent;
      color: var(--zhibo-cyan);
      box-shadow: none;
      border-left: 3px solid var(--zhibo-cyan);
    }
    .accordion-button {
      font-weight: 600;
    }
    footer a {
      color: #ccc;
      text-decoration: none;
      transition: color 0.2s;
    }
    footer a:hover {
      color: var(--zhibo-cyan);
    }