/* roulang page: index */
:root {
      --deep-blue: #0A1F3F;
      --spring-green: #00E5A0;
      --autumn-orange: #FF6B35;
      --bg-light: #F5F7FA;
      --card-glass-bg: rgba(255, 255, 255, 0.72);
      --text-primary: #1A2332;
      --text-secondary: #5C6B7E;
      --white: #ffffff;
      --border-light: rgba(255,255,255,0.45);
      --shadow-card: 0 8px 32px rgba(10,31,63,0.08), 0 2px 6px rgba(0,0,0,0.02);
      --shadow-card-hover: 0 12px 36px rgba(10,31,63,0.16), 0 4px 12px rgba(0,0,0,0.04);
      --radius-card: 18px;
      --radius-btn: 40px;
      --transition-smooth: 0.3s ease;
      --container-max: 1280px;
      --gap-section: 120px;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
      background-color: var(--bg-light);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      font-weight: 700;
      line-height: 1.3;
    }

    h1 {
      font-size: 48px;
      letter-spacing: -0.5px;
    }
    h2 {
      font-size: 36px;
    }
    h3 {
      font-size: 22px;
      font-weight: 600;
    }
    h4 {
      font-size: 18px;
      font-weight: 500;
    }

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

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

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 按钮体系 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-size: 16px;
      transition: all var(--transition-smooth);
      cursor: pointer;
      border: none;
      background: transparent;
      text-align: center;
      white-space: nowrap;
    }

    .btn-primary {
      background: var(--spring-green);
      color: var(--deep-blue);
      box-shadow: 0 0 18px rgba(0,229,160,0.45);
    }
    .btn-primary:hover {
      background: #00C98C;
      box-shadow: 0 0 28px rgba(0,229,160,0.6);
      transform: translateY(-1px);
    }

    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--deep-blue);
      color: var(--deep-blue);
    }
    .btn-secondary:hover {
      background: var(--deep-blue);
      color: white;
      border-color: var(--deep-blue);
    }

    .btn-accent {
      background: var(--autumn-orange);
      color: white;
      box-shadow: 0 0 16px rgba(255,107,53,0.4);
    }
    .btn-accent:hover {
      background: #e85d2a;
      box-shadow: 0 0 24px rgba(255,107,53,0.55);
    }

    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(255,255,255,0.6);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255,255,255,0.3);
      transition: background 0.3s, box-shadow 0.3s;
    }
    .main-header.scrolled {
      background: rgba(10,31,63,0.92);
      backdrop-filter: blur(16px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 22px;
      font-weight: 700;
      color: var(--spring-green);
      letter-spacing: 0.5px;
    }
    .logo-icon {
      font-size: 28px;
      filter: drop-shadow(0 0 8px rgba(0,229,160,0.6));
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-primary);
      font-weight: 500;
      position: relative;
      padding: 4px 0;
    }
    .main-header.scrolled .nav-links a {
      color: white;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--spring-green);
      transition: width 0.25s ease;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .header-cta {
      margin-left: 16px;
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(10,31,63,0.95);
      backdrop-filter: blur(20px);
      padding: 10px 20px;
      justify-content: space-around;
      align-items: center;
      z-index: 110;
      border-top: 1px solid rgba(255,255,255,0.2);
      border-radius: 32px 32px 0 0;
    }
    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: rgba(255,255,255,0.6);
      font-size: 12px;
      gap: 4px;
      transition: 0.2s;
      padding: 6px 12px;
      border-radius: 24px;
    }
    .mobile-nav-item.active {
      background: var(--autumn-orange);
      color: white;
      font-weight: 600;
      box-shadow: 0 0 14px rgba(255,107,53,0.5);
    }
    .mobile-nav-item i {
      font-size: 20px;
    }

    /* Hero */
    .hero {
      padding: 140px 0 100px;
      background: linear-gradient(135deg, #f0f4fc 0%, #e8f3ff 100%);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-left {
      flex: 0 0 55%;
    }
    .hero-right {
      flex: 0 0 45%;
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .hero-mockup {
      max-width: 320px;
      filter: drop-shadow(0 25px 40px rgba(10,31,63,0.25));
      z-index: 2;
      position: relative;
    }
    .hero-glow {
      position: absolute;
      width: 380px;
      height: 380px;
      background: radial-gradient(circle, rgba(0,229,160,0.3) 0%, transparent 70%);
      border-radius: 50%;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      z-index: 1;
    }
    .hero-subtitle {
      font-size: 18px;
      color: var(--text-secondary);
      margin: 24px 0 32px;
      max-width: 480px;
    }
    .hero-stats {
      display: flex;
      gap: 40px;
      margin-top: 40px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 28px;
      font-weight: 700;
      color: var(--deep-blue);
    }
    .stat-label {
      font-size: 14px;
      color: var(--text-secondary);
    }

    /* 板块通用 */
    .section {
      padding: var(--gap-section) 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 60px;
    }

    /* 亮点网格 */
    .feature-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .feature-card {
      background: var(--card-glass-bg);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
      transition: all var(--transition-smooth);
      display: flex;
      flex-direction: column;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover), 0 0 12px rgba(0,229,160,0.25);
    }
    .feature-card.wide {
      grid-column: span 2;
    }
    .feature-icon {
      font-size: 32px;
      color: var(--spring-green);
      margin-bottom: 16px;
    }
    .feature-card h3 {
      margin-bottom: 12px;
    }
    .feature-card p {
      color: var(--text-secondary);
      font-size: 15px;
    }
    .text-link {
      color: var(--spring-green);
      font-weight: 600;
      margin-top: 16px;
      display: inline-block;
    }

    /* 方案对比 */
    .compare-panels {
      display: flex;
      gap: 40px;
      align-items: stretch;
    }
    .compare-card {
      flex: 1;
      background: white;
      border-radius: 24px;
      padding: 40px 32px;
      box-shadow: 0 15px 35px rgba(0,0,0,0.05);
      display: flex;
      flex-direction: column;
    }
    .compare-card.pro {
      background: linear-gradient(145deg, #ffffff 0%, #f0fff9 100%);
      border: 1px solid rgba(0,229,160,0.3);
      box-shadow: 0 0 30px rgba(0,229,160,0.15);
    }
    .price {
      font-size: 42px;
      font-weight: 700;
      margin: 20px 0;
    }
    .feature-list {
      list-style: none;
      margin: 30px 0;
    }
    .feature-list li {
      margin-bottom: 14px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    /* 案例瀑布 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .case-card {
      background: var(--card-glass-bg);
      backdrop-filter: blur(18px);
      border-radius: var(--radius-card);
      padding: 24px;
      box-shadow: var(--shadow-card);
      transition: all 0.3s;
    }
    .case-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-card-hover);
    }
    .case-avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      object-fit: cover;
      margin-bottom: 12px;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid rgba(0,0,0,0.08);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.2s;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    .faq-item.active {
      background: rgba(0,229,160,0.04);
      border-left: 3px solid var(--spring-green);
      padding-left: 20px;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: var(--deep-blue);
      padding: 80px 0;
      text-align: center;
      color: white;
      position: relative;
    }
    .download-icons img {
      height: 48px;
      margin: 0 10px;
    }

    /* 页脚 */
    .footer {
      background: #0e1a2b;
      color: #ccd6e0;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
    }
    .subscribe-input {
      display: flex;
      margin-top: 16px;
    }
    .subscribe-input input {
      flex: 1;
      padding: 12px 16px;
      border-radius: 30px 0 0 30px;
      border: none;
      background: rgba(255,255,255,0.1);
      color: white;
    }
    .subscribe-input button {
      border-radius: 0 30px 30px 0;
      background: var(--spring-green);
      border: none;
      padding: 0 24px;
      font-weight: bold;
    }

    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
      }
      .feature-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .case-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .compare-panels {
        flex-direction: column;
      }
    }
    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      .desktop-nav { display: none; }
      .mobile-bottom-nav { display: flex; }
      .feature-grid, .case-grid {
        grid-template-columns: 1fr;
      }
      .feature-card.wide {
        grid-column: span 1;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero {
        padding: 100px 0 60px;
      }
    }