/* roulang page: index */
/* 全局设计变量与重置 */
    :root {
      --primary: #FF4D2E;
      --primary-dark: #E6421A;
      --primary-soft: #FFF4F0;
      --deep: #1A1A2E;
      --gray-bg: #F0F2F5;
      --white: #FFFFFF;
      --text-main: #1E1E2C;
      --text-secondary: #5A5A72;
      --text-light: #8E8EA0;
      --border-light: #EAECF0;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.1);
      --radius-card: 12px;
      --radius-button: 8px;
      --transition: 0.25s ease;
      --font-heavy: 'PingFang SC Heavy', 'Microsoft YaHei Bold', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--gray-bg);
      color: var(--text-main);
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, input {
      font-family: inherit;
      border: none;
      outline: none;
      background: none;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航栏 - 资讯门户吸顶 */
    .header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      transition: var(--transition);
    }
    .nav-brand-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 64px;
    }
    .logo {
      font-family: var(--font-heavy);
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1px;
    }
    .search-icon {
      font-size: 20px;
      color: var(--text-secondary);
      cursor: pointer;
      transition: color var(--transition);
    }
    .search-icon:hover {
      color: var(--primary);
    }
    .nav-channels {
      display: flex;
      align-items: center;
      gap: 32px;
      height: 40px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-secondary);
      border-top: 1px solid var(--border-light);
      overflow-x: auto;
      white-space: nowrap;
    }
    .nav-channels a {
      position: relative;
      padding: 4px 0;
      transition: color var(--transition);
    }
    .nav-channels a:hover,
    .nav-channels a.active {
      color: var(--primary);
    }
    .nav-channels a::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -2px;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width var(--transition);
    }
    .nav-channels a:hover::after,
    .nav-channels a.active::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--text-main);
    }
    /* Hero 双栏 */
    .hero {
      background: var(--deep);
      padding: 80px 0;
      position: relative;
      overflow: hidden;
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-left {
      flex: 5;
      color: white;
    }
    .hero-left h1 {
      font-family: var(--font-heavy);
      font-size: 44px;
      line-height: 1.3;
      margin-bottom: 20px;
      color: white;
    }
    .hero-left .sub {
      font-size: 18px;
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .btn-group {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-button);
      font-weight: 600;
      font-size: 16px;
      height: 52px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background var(--transition), box-shadow var(--transition);
      box-shadow: 0 4px 14px rgba(255,77,46,0.3);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 8px 22px rgba(230,66,26,0.4);
    }
    .btn-outline {
      border: 2px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-button);
      font-weight: 600;
      font-size: 16px;
      height: 52px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all var(--transition);
    }
    .btn-outline:hover {
      background: white;
      color: var(--deep);
    }
    .hero-right {
      flex: 5;
      position: relative;
      border-radius: 20px;
      overflow: hidden;
      background: linear-gradient(135deg, #FF4D2E20, #7B2FF720);
      min-height: 320px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .hero-img-bg {
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: 0.9;
      background: #2A2A40;
    }
    .glow-overlay {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 30% 40%, rgba(255,77,46,0.3), transparent 70%);
    }
    /* 亮点网格 */
    .features {
      padding: 100px 0;
      background: var(--gray-bg);
    }
    .section-title {
      font-family: var(--font-heavy);
      font-size: 32px;
      margin-bottom: 48px;
      color: var(--deep);
    }
    .grid-3x2 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 24px;
    }
    .feature-card {
      background: var(--white);
      padding: 28px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
      border: 1px solid transparent;
      position: relative;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(255,77,46,0.25);
    }
    .icon-circle {
      width: 48px;
      height: 48px;
      background: var(--primary-soft);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--primary);
      font-size: 24px;
      transition: 0.3s;
    }
    .feature-card:hover .icon-circle {
      box-shadow: 0 0 0 8px rgba(255,77,46,0.1);
    }
    .feature-card h3 {
      font-family: var(--font-heavy);
      font-size: 20px;
      margin-bottom: 8px;
    }
    .feature-card p {
      color: var(--text-secondary);
      font-size: 15px;
    }
    /* 案例瀑布流 */
    .cases {
      padding: 100px 0;
      background: white;
    }
    .waterfall {
      columns: 3 280px;
      column-gap: 24px;
    }
    .case-card {
      break-inside: avoid;
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      margin-bottom: 24px;
      overflow: hidden;
      transition: all var(--transition);
      border: 1px solid var(--border-light);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      height: 200px;
      background: #dcdce4;
      position: relative;
      overflow: hidden;
    }
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s;
    }
    .case-card:hover .case-img img {
      transform: scale(1.03);
    }
    .case-tag {
      position: absolute;
      top: 12px;
      left: 12px;
      background: rgba(26,26,46,0.8);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      border: 1px solid var(--primary);
    }
    .case-info {
      padding: 18px;
    }
    .case-info h4 {
      font-weight: 700;
      margin-bottom: 4px;
    }
    .data-highlight {
      color: var(--primary);
      font-weight: 700;
      font-size: 18px;
    }
    /* 方案对比 */
    .plans {
      padding: 100px 0;
      background: var(--gray-bg);
    }
    .compare-table {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
      justify-content: center;
    }
    .plan-card {
      flex: 1 1 240px;
      background: white;
      border-radius: var(--radius-card);
      padding: 28px 20px;
      box-shadow: var(--shadow-card);
      position: relative;
      transition: var(--transition);
    }
    .plan-card.recommend {
      background: var(--primary-soft);
      border: 1px solid var(--primary);
    }
    .badge {
      position: absolute;
      top: 12px;
      right: 12px;
      background: var(--primary);
      color: white;
      padding: 2px 12px;
      border-radius: 20px;
      font-size: 12px;
    }
    .plan-card h3 {
      font-size: 22px;
    }
    .price {
      font-size: 28px;
      font-weight: 700;
      color: var(--primary);
    }
    /* FAQ */
    .faq {
      padding: 100px 0;
      background: white;
    }
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
    }
    .accordion-question {
      display: flex;
      align-items: center;
      padding: 16px 0;
      cursor: pointer;
      font-weight: 600;
      font-size: 17px;
      transition: color var(--transition);
    }
    .accordion-question .q-icon {
      color: var(--primary);
      font-weight: 700;
      margin-right: 12px;
      font-size: 20px;
    }
    .accordion-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      background: #f9f9fb;
      border-radius: 8px;
      margin-bottom: 8px;
    }
    .accordion-answer p {
      padding: 16px;
      color: var(--text-secondary);
    }
    .active-answer {
      max-height: 200px;
    }
    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #1A1A2E 0%, #FF4D2E 100%);
      padding: 80px 0;
      text-align: center;
      color: white;
    }
    .cta-banner h2 {
      font-size: 36px;
      font-weight: 700;
    }
    .btn-white {
      background: white;
      color: var(--deep);
      padding: 14px 36px;
      border-radius: var(--radius-button);
      font-weight: 700;
      transition: 0.2s;
    }
    .btn-white:hover {
      background: #f0f0f0;
      color: var(--primary);
    }
    /* 页脚 */
    .footer {
      background: var(--deep);
      color: #bbb;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 40px;
      justify-content: space-between;
    }
    .footer-col h4 {
      color: white;
      margin-bottom: 16px;
    }
    .footer a {
      color: #ccc;
      display: block;
      margin-bottom: 8px;
    }
    .footer a:hover {
      color: var(--primary);
    }
    .social-icons i {
      font-size: 20px;
      margin-right: 16px;
      color: #aaa;
      transition: 0.2s;
    }
    .social-icons i:hover {
      color: var(--primary);
    }
    @media (max-width: 768px) {
      .hamburger {
        display: block;
      }
      .nav-channels {
        display: none;
        flex-direction: column;
        background: white;
        position: absolute;
        top: 64px;
        left: 0;
        width: 100%;
        padding: 16px;
        box-shadow: 0 8px 20px rgba(0,0,0,0.1);
      }
      .nav-channels.open {
        display: flex;
      }
      .hero .container {
        flex-direction: column;
      }
      .hero-left h1 {
        font-size: 36px;
      }
      .waterfall {
        columns: 1;
      }
    }