/* roulang page: index */
:root {
      --deep-blue: #0A1628;
      --card-bg: rgba(15, 30, 55, 0.65);
      --champion-gold: #D4A843;
      --electric-cyan: #00D4FF;
      --white: #FFFFFF;
      --text-body: #B0C4DE;
      --text-muted: #6B7D95;
      --border-light: rgba(255, 255, 255, 0.08);
      --border-medium: rgba(255, 255, 255, 0.12);
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-glow: 0 16px 48px rgba(0, 212, 255, 0.15);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --font-main: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", -apple-system, sans-serif;
      --font-number: "DIN Alternate", "SF Mono", "Menlo", monospace;
      --nav-height: 72px;
    }

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

    html {
      scroll-behavior: smooth;
      scroll-padding-top: var(--nav-height);
    }

    body {
      font-family: var(--font-main);
      background-color: var(--deep-blue);
      color: var(--text-body);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.25s ease;
    }

    button, input, textarea {
      font-family: inherit;
      font-size: inherit;
      border: none;
      outline: none;
      background: transparent;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 板块标题装饰 */
    .section-title {
      font-size: 36px;
      font-weight: 600;
      letter-spacing: 1px;
      color: var(--white);
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .section-title::before {
      content: '';
      display: inline-block;
      width: 4px;
      height: 28px;
      background: var(--champion-gold);
      border-radius: 2px;
    }

    .section-subtitle {
      font-size: 16px;
      color: var(--text-muted);
      max-width: 680px;
      margin-bottom: 48px;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      height: var(--nav-height);
      background: rgba(10, 22, 40, 0.3);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
      transition: background 0.3s ease;
    }
    .site-header.scrolled {
      background: rgba(10, 22, 40, 0.85);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 20px;
      font-weight: 700;
      color: var(--white);
      letter-spacing: 1px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, var(--champion-gold), #f0c45a);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
      color: #0A1628;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      font-size: 14px;
      font-weight: 400;
      color: var(--text-body);
      padding: 4px 0;
      position: relative;
      transition: color 0.2s;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--electric-cyan);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--electric-cyan);
      transition: width 0.25s ease;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .btn-primary-sm {
      background: var(--electric-cyan);
      color: var(--deep-blue);
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 14px;
      letter-spacing: 0.5px;
      box-shadow: 0 0 16px rgba(0, 212, 255, 0.5);
      transition: all 0.3s ease;
      display: inline-block;
    }
    .btn-primary-sm:hover {
      box-shadow: 0 0 28px rgba(0, 212, 255, 0.8);
      transform: scale(1.03);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--white);
      transition: 0.3s;
    }
    .mobile-menu {
      display: none;
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--electric-cyan);
      color: var(--deep-blue);
      padding: 14px 36px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 15px;
      letter-spacing: 1px;
      box-shadow: 0 0 24px rgba(0, 212, 255, 0.5);
      transition: all 0.3s ease;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      box-shadow: 0 0 40px rgba(0, 212, 255, 0.8);
      transform: scale(1.03);
    }
    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--white);
      color: var(--white);
      padding: 14px 36px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 15px;
      letter-spacing: 1px;
      transition: all 0.3s ease;
      display: inline-block;
      text-align: center;
    }
    .btn-secondary:hover {
      border-color: var(--electric-cyan);
      color: var(--electric-cyan);
      background: rgba(0, 212, 255, 0.08);
    }

    /* 卡片玻璃效果 */
    .glass-card {
      background: var(--card-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.2s;
    }
    .glass-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-glow);
      border-color: rgba(0, 212, 255, 0.4);
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #0A1628 0%, #0f1e35 100%);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(0, 212, 255, 0.08) 0%, transparent 60%);
      pointer-events: none;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 720px;
    }
    .hero h1 {
      font-size: 52px;
      font-weight: 700;
      letter-spacing: 2px;
      line-height: 1.2;
      color: var(--white);
      margin-bottom: 24px;
    }
    .hero h1 .gold {
      color: var(--champion-gold);
    }
    .hero p {
      font-size: 18px;
      color: var(--text-body);
      margin-bottom: 40px;
      max-width: 600px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      animation: pulse 2s infinite;
      color: var(--white);
      font-size: 24px;
    }
    @keyframes pulse {
      0% { opacity: 0.5; transform: translateX(-50%) translateY(0); }
      50% { opacity: 1; transform: translateX(-50%) translateY(6px); }
      100% { opacity: 0.5; transform: translateX(-50%) translateY(0); }
    }

    section {
      padding: 120px 0;
    }

    /* 功能网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .feature-card {
      padding: 32px;
      text-align: left;
    }
    .feature-icon {
      width: 64px;
      height: 64px;
      margin-bottom: 24px;
      color: var(--electric-cyan);
      display: flex;
      align-items: center;
      font-size: 40px;
    }
    .feature-card h3 {
      font-size: 22px;
      font-weight: 500;
      color: var(--white);
      margin-bottom: 12px;
    }
    .feature-card p {
      font-size: 14px;
      color: var(--text-body);
      line-height: 1.7;
    }

    /* 场景交替 */
    .scenario-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      margin-bottom: 100px;
    }
    .scenario-img {
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: transform 0.3s;
    }
    .scenario-img:hover {
      transform: scale(1.02);
    }
    .scenario-text h3 {
      font-size: 28px;
      font-weight: 500;
      color: var(--white);
      margin-bottom: 16px;
    }
    .scenario-text p {
      color: var(--text-body);
      margin-bottom: 24px;
    }
    .data-highlight {
      font-family: var(--font-number);
      font-size: 28px;
      color: var(--champion-gold);
    }

    /* 案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .case-card {
      padding: 28px;
      background: rgba(10, 20, 35, 0.8);
    }
    .case-logo {
      height: 40px;
      filter: grayscale(1);
      margin-bottom: 20px;
      transition: 0.3s;
    }
    .case-card:hover .case-logo {
      filter: grayscale(0);
    }
    .case-number {
      font-family: var(--font-number);
      font-size: 38px;
      color: var(--champion-gold);
      margin-bottom: 12px;
    }
    .case-quote {
      font-style: italic;
      font-size: 14px;
      color: var(--text-body);
      margin-bottom: 16px;
    }

    /* 价格 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      align-items: start;
    }
    .pricing-card {
      padding: 36px 28px;
      text-align: center;
      position: relative;
    }
    .pricing-card.featured {
      border-color: var(--champion-gold);
      transform: scale(1.05);
      box-shadow: 0 0 30px rgba(212, 168, 67, 0.25);
    }
    .badge {
      background: var(--electric-cyan);
      color: #0A1628;
      font-size: 12px;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 16px;
      font-weight: 600;
    }
    .price {
      font-family: var(--font-number);
      font-size: 48px;
      color: var(--white);
      margin: 20px 0;
    }
    .feature-list {
      list-style: none;
      text-align: left;
      margin: 28px 0;
    }
    .feature-list li {
      padding: 6px 0;
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--text-body);
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      width: 100%;
      text-align: left;
      padding: 20px 0;
      font-size: 18px;
      font-weight: 500;
      color: var(--white);
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-body);
      padding: 0 0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }

    /* CTA 表单 */
    .cta-band {
      background: #060F1A;
    }
    .form-container {
      max-width: 520px;
      margin: 0 auto;
    }
    .form-group input,
    .form-group textarea {
      width: 100%;
      background: rgba(255,255,255,0.05);
      border: 1px solid var(--border-medium);
      border-radius: var(--radius-sm);
      padding: 12px 16px;
      color: white;
      margin-bottom: 16px;
    }
    .form-group input:focus,
    .form-group textarea:focus {
      border-color: var(--electric-cyan);
      box-shadow: 0 0 10px rgba(0,212,255,0.3);
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .copyright {
      text-align: center;
      font-size: 14px;
      color: var(--text-muted);
      margin-top: 40px;
      padding-top: 24px;
      border-top: 1px solid var(--border-light);
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .features-grid,
      .cases-grid,
      .pricing-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .pricing-card.featured {
        transform: none;
      }
      .scenario-row {
        gap: 32px;
      }
    }
    @media (max-width: 767px) {
      :root { --nav-height: 56px; }
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .mobile-menu.active {
        display: flex;
        flex-direction: column;
        position: fixed;
        inset: 0;
        background: #0A1628;
        justify-content: center;
        align-items: center;
        gap: 28px;
        z-index: 999;
      }
      .hero h1 { font-size: 36px; }
      .section-title { font-size: 28px; }
      .features-grid,
      .cases-grid,
      .pricing-grid,
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .scenario-row {
        grid-template-columns: 1fr;
      }
      section { padding: 60px 0; }
      .hero-buttons .btn-primary,
      .hero-buttons .btn-secondary {
        width: 100%;
        text-align: center;
      }
    }