/* roulang page: index */
:root {
      --deep-purple: #4B2A7A;
      --nebula-cyan: #1ABC9C;
      --dark-blue: #2C3E50;
      --bg-light: #F8F9FC;
      --card-white: #FFFFFF;
      --title-dark: #1E1E2F;
      --body-text: #4A4A6A;
      --muted-text: #7B7B98;
      --border-light: #DDE1EB;
      --shadow-sm: 0 4px 20px rgba(75, 42, 122, 0.08);
      --shadow-hover: 0 8px 30px rgba(75, 42, 122, 0.15);
      --radius-card: 24px;
      --radius-btn: 12px;
      --radius-input: 12px;
      --bs-primary: #4B2A7A;
      --bs-body-bg: #F8F9FC;
      --bs-border-radius: 24px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg-light);
      color: var(--body-text);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
    }

    h1, h2, h3, h4, h5, h6 {
      color: var(--title-dark);
      font-weight: 700;
      line-height: 1.4;
    }

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

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 导航 */
    .navbar-custom {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 999;
      transition: all 0.3s ease;
      background: transparent;
      padding: 0;
    }

    .navbar-scrolled {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.05);
      border-bottom: 1px solid rgba(0,0,0,0.05);
    }

    .brand-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 20px;
      transition: all 0.3s;
    }

    .navbar-scrolled .brand-row {
      padding: 6px 20px;
    }

    .logo-text {
      font-size: 1.6rem;
      font-weight: 700;
      color: white;
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: 1px;
      transition: color 0.3s;
    }

    .navbar-scrolled .logo-text {
      color: var(--deep-purple);
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      background: radial-gradient(circle, var(--nebula-cyan) 0%, var(--deep-purple) 80%);
      border-radius: 50%;
      display: inline-block;
      box-shadow: 0 0 12px rgba(26,188,156,0.5);
    }

    .brand-actions {
      display: flex;
      align-items: center;
      gap: 18px;
    }

    .search-icon {
      font-size: 1.2rem;
      color: white;
      cursor: pointer;
      transition: color 0.3s;
    }

    .navbar-scrolled .search-icon {
      color: var(--deep-purple);
    }

    .btn-consult {
      background: var(--nebula-cyan);
      border: none;
      color: #fff;
      padding: 8px 20px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 0.9rem;
      transition: 0.2s;
      white-space: nowrap;
    }

    .btn-consult:hover {
      background: #16a085;
      color: white;
    }

    .channel-row {
      background: rgba(0,0,0,0.2);
      padding: 8px 20px;
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 24px;
      transition: background 0.3s;
    }

    .navbar-scrolled .channel-row {
      background: transparent;
    }

    .channel-link {
      color: rgba(255,255,255,0.9);
      font-weight: 500;
      font-size: 0.95rem;
      padding: 4px 8px;
      border-radius: 20px;
      transition: 0.2s;
    }

    .navbar-scrolled .channel-link {
      color: var(--title-dark);
    }

    .channel-link:hover {
      color: var(--nebula-cyan);
      background: rgba(255,255,255,0.15);
    }

    .navbar-scrolled .channel-link:hover {
      background: rgba(75,42,122,0.08);
    }

    /* 移动端汉堡 */
    .navbar-toggler-custom {
      display: none;
      background: transparent;
      border: none;
      color: white;
      font-size: 1.8rem;
      cursor: pointer;
    }

    .navbar-scrolled .navbar-toggler-custom {
      color: var(--deep-purple);
    }

    @media (max-width: 768px) {
      .channel-row {
        display: none;
        flex-direction: column;
        background: rgba(0,0,0,0.8);
        padding: 20px;
        gap: 12px;
      }
      .channel-row.active {
        display: flex;
      }
      .navbar-toggler-custom {
        display: block;
      }
      .brand-row {
        flex-wrap: wrap;
      }
    }

    /* Hero */
    .hero-section {
      min-height: 100vh;
      background: linear-gradient(135deg, #1a1a2e 0%, #2C3E50 40%, #4B2A7A 100%);
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }

    .particles {
      position: absolute;
      width: 100%;
      height: 100%;
      top: 0;
      left: 0;
      pointer-events: none;
    }

    .particle {
      position: absolute;
      background: white;
      border-radius: 50%;
      opacity: 0.3;
      animation: float 8s infinite;
    }

    @keyframes float {
      0% { transform: translateY(0px) scale(1); }
      50% { transform: translateY(-30px) scale(1.1); }
      100% { transform: translateY(0px) scale(1); }
    }

    .hero-content {
      position: relative;
      z-index: 2;
      color: white;
      padding: 120px 0 80px;
    }

    .hero-title {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 1.5rem;
      color: white;
    }

    .hero-sub {
      font-size: 1.2rem;
      opacity: 0.9;
      margin-bottom: 2rem;
      max-width: 700px;
    }

    .btn-primary-custom {
      background: linear-gradient(135deg, var(--deep-purple), #6C3483);
      border: none;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      color: white;
      transition: 0.3s;
      box-shadow: 0 4px 15px rgba(75,42,122,0.4);
      margin-right: 16px;
    }

    .btn-primary-custom:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(75,42,122,0.6);
      color: white;
    }

    .btn-outline-custom {
      border: 2px solid var(--nebula-cyan);
      color: var(--nebula-cyan);
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      background: transparent;
      transition: 0.3s;
    }

    .btn-outline-custom:hover {
      background: var(--nebula-cyan);
      color: #fff;
    }

    @media (max-width: 768px) {
      .hero-title { font-size: 2rem; }
      .hero-sub { font-size: 1rem; }
    }

    /* 通用区块 */
    .section-block {
      padding: 100px 0;
    }

    @media (max-width: 768px) {
      .section-block { padding: 60px 0; }
    }

    .section-title {
      font-size: 2.2rem;
      margin-bottom: 1rem;
      text-align: center;
    }

    /* 优势卡片交错 */
    .feature-card {
      background: var(--card-white);
      border-radius: 32px;
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: 0.3s;
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      gap: 30px;
      flex-wrap: wrap;
    }

    .feature-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    .badge-data {
      background: rgba(26,188,156,0.12);
      color: var(--nebula-cyan);
      font-weight: 700;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.9rem;
    }

    /* Tab解决方案 */
    .tab-btn {
      border: none;
      background: transparent;
      padding: 10px 24px;
      font-weight: 600;
      color: var(--muted-text);
      border-radius: 30px;
      transition: 0.2s;
    }

    .tab-btn.active {
      background: var(--deep-purple);
      color: white;
    }

    .solution-card {
      background: white;
      border-radius: 20px;
      padding: 24px;
      border: 1px solid rgba(0,0,0,0.05);
      transition: 0.2s;
      height: 100%;
    }

    .solution-card:hover {
      border-color: var(--deep-purple);
    }

    /* 场景图文 */
    .scene-img {
      border-radius: 32px;
      box-shadow: var(--shadow-sm);
      transition: 0.3s;
    }

    .scene-img:hover {
      transform: scale(1.02);
    }

    /* 套餐 */
    .pricing-card {
      background: white;
      border-radius: 28px;
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: 0.3s;
      border: 2px solid transparent;
    }

    .pricing-card.featured {
      border-color: var(--deep-purple);
      box-shadow: var(--shadow-hover);
      transform: scale(1.02);
    }

    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: #F1F3F9;
      color: var(--deep-purple);
      font-weight: 600;
    }

    /* 页脚 */
    .footer-dark {
      background: #1E1E2F;
      color: #ccc;
      padding: 60px 0 20px;
    }

    .footer-dark a:hover {
      color: var(--nebula-cyan);
    }

    .social-circle {
      width: 40px;
      height: 40px;
      background: rgba(255,255,255,0.1);
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      margin-right: 10px;
      transition: 0.2s;
    }

    .social-circle:hover {
      background: var(--deep-purple);
    }