/* roulang page: index */
:root {
      --primary-deep: #0B0E2F;
      --accent-purple: #6C3CE1;
      --accent-cyan: #1EA4C4;
      --bg-light: #F5F3FF;
      --card-white: #FFFFFF;
      --text-dark: #1E1B2E;
      --text-muted: #5A5671;
      --border-light: #E8E4F0;
      --shadow-card: 0 8px 30px rgba(11, 14, 47, 0.08);
      --shadow-hover: 0 16px 40px rgba(108, 60, 225, 0.15);
      --radius-card: 20px;
      --radius-btn: 50px;
      --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --transition-base: 0.3s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.8;
      margin: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4 {
      font-weight: 700;
      letter-spacing: -0.3px;
    }
    h1 {
      font-size: 48px;
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
    }
    h2 {
      font-size: 36px;
      font-weight: 700;
    }
    h3 {
      font-size: 22px;
      font-weight: 600;
    }
    .section-title {
      margin-bottom: 2.5rem;
      position: relative;
    }
    .btn-primary-custom {
      background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));
      border: none;
      color: white;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: var(--transition-base);
      box-shadow: 0 4px 15px rgba(108, 60, 225, 0.3);
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-primary-custom:hover {
      filter: brightness(1.15);
      transform: scale(1.03);
      color: white;
      box-shadow: 0 8px 25px rgba(108, 60, 225, 0.5);
    }
    .btn-outline-accent {
      border: 2px solid var(--accent-purple);
      color: var(--accent-purple);
      background: transparent;
      padding: 10px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition-base);
    }
    .btn-outline-accent:hover {
      background: var(--accent-purple);
      color: white;
    }
    /* 导航杂志频道式 */
    .navbar-brand-custom {
      font-size: 28px;
      font-weight: 700;
      color: var(--primary-deep) !important;
      letter-spacing: 1px;
    }
    .navbar-brand-custom i {
      color: var(--accent-cyan);
      margin-right: 6px;
    }
    .channel-nav {
      background: white;
      border-bottom: 1px solid var(--border-light);
    }
    .nav-channel .nav-link {
      color: var(--text-muted);
      font-weight: 500;
      padding: 0.75rem 1.2rem;
      font-size: 15px;
      border-bottom: 3px solid transparent;
      transition: var(--transition-base);
    }
    .nav-channel .nav-link.active,
    .nav-channel .nav-link:hover {
      color: var(--accent-purple);
      border-bottom-color: var(--accent-cyan);
    }
    .sticky-top-custom {
      position: sticky;
      top: 0;
      z-index: 1020;
    }
    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
    }
    @media (max-width: 768px) {
      .desktop-channel {
        display: none;
      }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: white;
        border-top: 1px solid var(--border-light);
        justify-content: space-around;
        padding: 10px 0;
        z-index: 1050;
        box-shadow: 0 -4px 15px rgba(0,0,0,0.05);
      }
      .mobile-bottom-nav a {
        color: var(--text-muted);
        text-align: center;
        font-size: 18px;
        display: flex;
        flex-direction: column;
        align-items: center;
        text-decoration: none;
      }
      .mobile-bottom-nav a.active {
        color: var(--accent-purple);
      }
      h1 {
        font-size: 32px;
      }
      h2 {
        font-size: 26px;
      }
    }
    /* Hero */
    #hero {
      background: linear-gradient(135deg, #0B0E2F 0%, #6C3CE1 70%, #1EA4C4 100%);
      position: relative;
      overflow: hidden;
      color: white;
      padding: 6rem 0 5rem;
    }
    .star-particle {
      position: absolute;
      background: white;
      border-radius: 50%;
      opacity: 0.4;
      animation: floatParticle 8s infinite alternate;
    }
    @keyframes floatParticle {
      0% { transform: translateY(0px); opacity: 0.3; }
      100% { transform: translateY(-30px); opacity: 0.7; }
    }
    .hero-badge {
      background: rgba(255,255,255,0.15);
      backdrop-filter: blur(10px);
      border-radius: 16px;
      padding: 12px 20px;
      color: white;
      font-weight: 500;
    }
    .hero-badge .number {
      font-size: 32px;
      font-weight: 800;
      color: var(--accent-cyan);
      display: block;
    }
    /* 指标看板 */
    .metric-card {
      background: rgba(255,255,255,0.1);
      backdrop-filter: blur(12px);
      border-radius: 20px;
      padding: 2rem 1.5rem;
      color: white;
      text-align: center;
      border: 1px solid rgba(255,255,255,0.2);
      transition: var(--transition-base);
    }
    .metric-number {
      font-size: 36px;
      font-weight: 800;
      color: var(--accent-cyan);
    }
    /* 服务卡片 */
    .service-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 2rem 1.8rem;
      box-shadow: var(--shadow-card);
      transition: var(--transition-base);
      height: 100%;
      border: none;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .service-icon {
      width: 56px;
      height: 56px;
      background: var(--accent-purple);
      border-radius: 18px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 28px;
      margin-bottom: 1.2rem;
    }
    .data-tag {
      background: rgba(30,164,196,0.1);
      color: var(--accent-cyan);
      font-weight: 600;
      font-size: 14px;
      padding: 4px 12px;
      border-radius: 20px;
    }
    /* 对比区 */
    .compare-before {
      background: #F0EDF5;
      border-radius: 24px;
      padding: 2rem;
    }
    .compare-after {
      background: linear-gradient(135deg, #0B0E2F, #6C3CE1);
      border-radius: 24px;
      padding: 2rem;
      color: white;
    }
    /* FAQ */
    .accordion-button {
      font-weight: 600;
      background: white;
      border-radius: 12px !important;
      box-shadow: none;
      border: 1px solid var(--border-light);
    }
    .accordion-button:not(.collapsed) {
      background: #F5F0FF;
      color: var(--accent-purple);
      box-shadow: 0 0 18px rgba(108,60,225,0.25);
    }
    /* CTA表单 */
    .cta-input-group {
      max-width: 520px;
      margin: 0 auto;
      display: flex;
      border-radius: 50px;
      overflow: hidden;
      box-shadow: 0 10px 30px rgba(0,0,0,0.15);
    }
    .cta-input-group input {
      border: none;
      padding: 16px 24px;
      flex:1;
      outline: none;
      font-size: 16px;
    }
    .cta-input-group button {
      background: var(--accent-cyan);
      border: none;
      color: white;
      padding: 0 32px;
      font-weight: 600;
      white-space: nowrap;
    }
    footer {
      background: var(--primary-deep);
      color: rgba(255,255,255,0.7);
    }