/* roulang page: index */
:root {
      --primary-deep: #0A0E27;
      --primary-dark: #141A33;
      --accent-cyan: #00F0FF;
      --accent-red: #FF4655;
      --accent-red-hover: #E03E4A;
      --bg-light: #F4F6F9;
      --card-bg: #FFFFFF;
      --border-light: #E2E8F0;
      --text-dark: #1E293B;
      --text-gray: #64748B;
      --text-light: #F8FAFC;
      --text-muted: #94A3B8;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-mono: "Inter", "Roboto", sans-serif;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.12);
      --radius-lg: 12px;
      --radius-md: 8px;
      --radius-full: 20px;
      --transition: 0.25s ease;
      --max-width: 1280px;
      --header-height: 72px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.3;
    }
    h1 {
      font-size: 40px;
      letter-spacing: -0.5px;
    }
    h2 {
      font-size: 32px;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 20px;
      font-weight: 600;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      font-family: var(--font-sans);
      cursor: pointer;
      border: none;
      background: transparent;
      font-weight: 600;
      font-size: 16px;
      transition: all 0.2s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border-radius: var(--radius-md);
    }
    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: rgba(10, 14, 39, 0.95);
      backdrop-filter: blur(8px);
      z-index: 1000;
      border-bottom: 1px solid rgba(0, 240, 255, 0.15);
    }
    .header-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: white;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
    }
    .logo .highlight {
      color: var(--accent-cyan);
      margin-right: 2px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      color: white;
      font-size: 14px;
      font-weight: 500;
      position: relative;
      padding: 8px 0;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-cyan);
    }
    .nav-cta {
      padding: 10px 24px;
      border: 1px solid var(--accent-cyan);
      color: var(--accent-cyan);
      background: transparent;
      border-radius: var(--radius-md);
      font-weight: 600;
      font-size: 14px;
      margin-left: 16px;
    }
    .nav-cta:hover {
      background: rgba(0, 240, 255, 0.1);
      border-color: var(--accent-cyan);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 28px;
      cursor: pointer;
    }
    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background: var(--primary-deep);
        flex-direction: column;
        padding: 24px 0;
        gap: 24px;
        align-items: center;
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
      .nav-cta {
        margin-left: 0;
        width: 80%;
        text-align: center;
      }
    }
    /* Hero */
    .hero {
      background: var(--primary-deep);
      padding: 120px 0 80px;
      margin-top: 0;
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-left {
      flex: 0 0 55%;
      color: white;
    }
    .hero-left h1 {
      color: white;
      margin-bottom: 20px;
      font-size: 48px;
      line-height: 1.2;
    }
    .hero-left .subtitle {
      font-size: 18px;
      color: #CBD5E1;
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-red);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-md);
      font-weight: 700;
    }
    .btn-primary:hover {
      background: var(--accent-red-hover);
    }
    .btn-outline {
      border: 1px solid var(--accent-cyan);
      color: var(--accent-cyan);
      padding: 14px 32px;
      background: transparent;
    }
    .btn-outline:hover {
      background: rgba(0, 240, 255, 0.1);
    }
    .hero-right {
      flex: 0 0 45%;
      position: relative;
      height: 420px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: var(--radius-lg);
      overflow: hidden;
    }
    .hero-right::after {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(10, 14, 39, 0.5);
    }
    .data-float {
      position: absolute;
      background: rgba(20, 26, 51, 0.9);
      backdrop-filter: blur(4px);
      padding: 16px 20px;
      border-radius: var(--radius-md);
      color: white;
      z-index: 2;
      border-left: 4px solid var(--accent-cyan);
      box-shadow: 0 0 20px rgba(0,240,255,0.2);
    }
    .float-1 { top: 20px; left: 20px; }
    .float-2 { bottom: 70px; right: 20px; }
    .float-3 { top: 140px; right: 30px; }
    .data-number {
      font-family: var(--font-mono);
      font-size: 28px;
      font-weight: 700;
      color: var(--accent-cyan);
      text-shadow: 0 0 8px rgba(0,240,255,0.4);
    }
    .section {
      padding: 100px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 60px;
    }
    .section-title h2 {
      color: var(--primary-deep);
    }
    /* 亮点网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--card-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .feature-icon {
      width: 48px;
      height: 48px;
      background: rgba(0,240,255,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent-cyan);
      font-size: 24px;
      margin-bottom: 20px;
    }
    /* 数据瀑布 */
    .waterfall-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .waterfall-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border: 1px solid var(--border-light);
    }
    .waterfall-card:hover {
      box-shadow: var(--shadow-md);
    }
    .card-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }
    .card-body {
      padding: 20px;
    }
    .tags {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
      margin: 12px 0;
    }
    .tag {
      background: rgba(255,70,85,0.1);
      color: var(--accent-red);
      padding: 2px 12px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 600;
    }
    /* 方案对比 */
    .compare-table {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .plan-card {
      background: white;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 28px 16px;
      text-align: center;
      transition: var(--transition);
    }
    .plan-card.popular {
      border-color: var(--accent-red);
      position: relative;
    }
    .popular-badge {
      background: var(--accent-red);
      color: white;
      font-size: 12px;
      padding: 4px 12px;
      border-radius: 20px;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
    }
    .plan-feature {
      padding: 8px 0;
      color: var(--text-gray);
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 500;
      cursor: pointer;
      font-size: 18px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-gray);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    /* CTA */
    .cta-dark {
      background: var(--primary-deep);
      text-align: center;
    }
    .social-icons i {
      font-size: 24px;
      color: var(--accent-cyan);
      margin: 0 8px;
      transition: var(--transition);
    }
    .footer {
      background: var(--primary-dark);
      color: #CBD5E1;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: repeat(2,1fr); }
      .compare-table { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .hero-grid { flex-direction: column; }
      .hero-left, .hero-right { flex: 1 1 auto; width: 100%; }
      .waterfall-grid, .features-grid { grid-template-columns: 1fr; }
      .compare-table { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }