/* roulang page: index */
:root {
      --bg-primary: #0A0E27;
      --bg-secondary: #0F1535;
      --accent-cyan: #00F0FF;
      --accent-red: #FF3366;
      --accent-purple: #7B2FFF;
      --text-primary: #FFFFFF;
      --text-secondary: #B0C4DE;
      --text-muted: #6B7B8D;
      --glass-bg: rgba(255,255,255,0.04);
      --glass-border: rgba(255,255,255,0.1);
      --glass-blur: blur(20px) saturate(180%);
      --glow-cyan: 0 0 20px rgba(0,240,255,0.3);
      --radius-card: 16px;
      --radius-btn: 10px;
      --radius-tag: 20px;
      --font-h1: 700 clamp(36px, 6vw, 48px)/1.2 'PingFang SC','Microsoft YaHei','Noto Sans SC',sans-serif;
      --font-h2: 600 clamp(28px, 4.5vw, 36px)/1.3 'PingFang SC','Microsoft YaHei',sans-serif;
      --font-h3: 500 clamp(20px, 2.8vw, 22px)/1.4 'PingFang SC','Microsoft YaHei',sans-serif;
      --font-body: 400 16px/1.7 'PingFang SC','Microsoft YaHei','Noto Sans SC',sans-serif;
      --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      background: var(--bg-primary);
      color: var(--text-secondary);
      font: var(--font-body);
      background-image: linear-gradient(180deg, #0A0E27 0%, #141833 100%);
      min-height: 100vh;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }

    button, input {
      font-family: inherit;
      outline: none;
    }

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

    @media (max-width: 480px) {
      .container {
        padding: 0 16px;
      }
    }

    /* 导航 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: transparent;
      backdrop-filter: blur(0px);
      border-bottom: 1px solid transparent;
      transition: var(--transition-smooth);
      height: 72px;
      display: flex;
      align-items: center;
    }

    #header.scrolled {
      background: rgba(10, 14, 39, 0.88);
      backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      box-shadow: 0 4px 24px rgba(0,0,0,0.4);
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--text-primary);
      letter-spacing: -0.3px;
    }

    .logo-icon {
      font-size: 28px;
      color: var(--accent-cyan);
      filter: drop-shadow(0 0 6px rgba(0,240,255,0.5));
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .nav-link {
      color: var(--text-secondary);
      font-size: 15px;
      padding: 8px 16px;
      border-radius: 8px;
      font-weight: 500;
      transition: var(--transition-smooth);
    }

    .nav-link:hover {
      color: var(--accent-cyan);
      background: rgba(0,240,255,0.06);
    }

    .btn-primary {
      background: linear-gradient(135deg, #00F0FF, #0099CC);
      color: #0A0E27;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      box-shadow: 0 4px 20px rgba(0,240,255,0.4), 0 0 40px rgba(0,240,255,0.15);
      border: none;
      cursor: pointer;
      transition: var(--transition-smooth);
      display: inline-block;
      text-align: center;
      font-size: 15px;
      letter-spacing: 0.3px;
    }

    .btn-primary:hover {
      box-shadow: 0 6px 28px rgba(0,240,255,0.6);
      transform: translateY(-2px);
    }

    .btn-ghost {
      background: transparent;
      border: 1.5px solid rgba(0,240,255,0.55);
      color: var(--accent-cyan);
      padding: 11px 27px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition-smooth);
      display: inline-block;
      font-size: 15px;
    }

    .btn-ghost:hover {
      background: rgba(0,240,255,0.08);
      border-color: var(--accent-cyan);
    }

    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .menu-toggle span {
      width: 26px;
      height: 2.5px;
      background: var(--accent-cyan);
      border-radius: 4px;
      transition: var(--transition-smooth);
    }

    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background: rgba(10,14,39,0.98);
        backdrop-filter: blur(30px);
        flex-direction: column;
        justify-content: center;
        gap: 24px;
        transition: 0.4s ease;
        box-shadow: -8px 0 30px rgba(0,0,0,0.6);
        border-left: 1px solid rgba(255,255,255,0.05);
      }
      .nav-menu.active {
        right: 0;
      }
      .menu-toggle {
        display: flex;
      }
      .nav-link {
        font-size: 20px;
        padding: 12px 24px;
      }
    }

    /* Hero */
    #hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      background: radial-gradient(circle at 20% 30%, rgba(0,240,255,0.12) 0%, transparent 50%),
                  radial-gradient(circle at 80% 70%, rgba(123,47,255,0.12) 0%, transparent 50%);
    }

    .hero-content {
      text-align: center;
      max-width: 850px;
      margin: 0 auto;
      position: relative;
      z-index: 2;
    }

    .badge {
      background: rgba(0,240,255,0.12);
      color: var(--accent-cyan);
      padding: 6px 20px;
      border-radius: var(--radius-tag);
      font-size: 14px;
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 28px;
      letter-spacing: 0.4px;
    }

    .pulse-dot {
      width: 8px;
      height: 8px;
      background: var(--accent-cyan);
      border-radius: 50%;
      display: inline-block;
      box-shadow: 0 0 8px var(--accent-cyan);
      animation: pulse 1.8s infinite;
    }

    @keyframes pulse {
      0% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.5; transform: scale(1.3); }
      100% { opacity: 1; transform: scale(1); }
    }

    .hero-title {
      font: var(--font-h1);
      background: linear-gradient(180deg, #FFFFFF 0%, #B0C4DE 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 24px;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      max-width: 620px;
      margin: 0 auto 36px;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 20px;
      flex-wrap: wrap;
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
    }

    .section-title {
      font: var(--font-h2);
      color: var(--text-primary);
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .title-accent {
      width: 4px;
      height: 32px;
      background: var(--accent-cyan);
      border-radius: 4px;
      box-shadow: 0 0 12px rgba(0,240,255,0.5);
    }

    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: var(--glass-blur);
      -webkit-backdrop-filter: var(--glass-blur);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      box-shadow: 0 8px 32px rgba(0,0,0,0.3), inset 0 1px 0 rgba(255,255,255,0.05);
      transition: var(--transition-smooth);
    }

    .glass-card:hover {
      border-color: rgba(0,240,255,0.3);
      box-shadow: 0 0 24px rgba(0,240,255,0.15);
    }

    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 48px;
    }

    .feature-card {
      padding: 32px 24px;
      text-align: center;
    }

    .feature-icon {
      width: 56px;
      height: 56px;
      background: rgba(0,240,255,0.1);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 20px;
      font-size: 28px;
      color: var(--accent-cyan);
    }

    .feature-card h3 {
      color: var(--text-primary);
      margin-bottom: 12px;
      font-size: 1.4rem;
    }

    /* 功能分组 */
    .module-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 80px;
    }

    .module-row.reverse {
      flex-direction: row-reverse;
    }

    .module-img {
      flex: 1;
      border-radius: 24px;
      overflow: hidden;
      background: rgba(0,240,255,0.08);
    }

    .module-text {
      flex: 1;
    }

    .module-text h2 {
      margin-bottom: 18px;
    }

    .feature-list {
      list-style: none;
      margin: 20px 0;
    }

    .feature-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 10px;
      color: var(--text-secondary);
    }

    .feature-list li::before {
      content: "✓";
      color: var(--accent-cyan);
      font-weight: bold;
    }

    .text-link {
      color: var(--accent-cyan);
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      border-bottom: 1px solid transparent;
      transition: var(--transition-smooth);
    }

    .text-link:hover {
      color: var(--accent-red);
      border-bottom-color: var(--accent-red);
    }

    @media (max-width: 768px) {
      .module-row, .module-row.reverse {
        flex-direction: column;
      }
      .features-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 场景 */
    .scenario-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding: 20px 0;
      scrollbar-width: thin;
      scrollbar-color: var(--accent-cyan) rgba(255,255,255,0.05);
    }

    .scenario-card {
      min-width: 260px;
      flex: 0 0 auto;
      padding: 20px;
    }

    /* 数据 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 40px;
    }

    .stat-card {
      text-align: center;
      padding: 28px 16px;
      position: relative;
      overflow: hidden;
    }

    .stat-number {
      font-size: 48px;
      font-weight: 700;
      background: linear-gradient(135deg, #00F0FF, #7B2FFF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .stat-label {
      color: var(--text-secondary);
      margin-top: 8px;
    }

    .stat-card::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 3px;
      background: linear-gradient(90deg, #00F0FF, #7B2FFF);
      border-radius: 0 0 16px 16px;
    }

    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    /* 价格 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 48px;
    }

    .pricing-card {
      padding: 36px 24px;
      text-align: center;
      position: relative;
    }

    .pricing-card.recommended {
      border-color: rgba(0,240,255,0.4);
      box-shadow: 0 0 28px rgba(0,240,255,0.25);
      transform: translateY(-8px);
    }

    .badge-popular {
      background: var(--accent-red);
      color: white;
      padding: 4px 16px;
      border-radius: 20px;
      font-size: 13px;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
    }

    .price {
      font-size: 42px;
      font-weight: 700;
      color: white;
      margin: 20px 0;
    }

    @media (max-width: 768px) {
      .pricing-grid {
        grid-template-columns: 1fr;
      }
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 40px auto 0;
    }

    .faq-item {
      margin-bottom: 16px;
    }

    .faq-question {
      background: var(--glass-bg);
      backdrop-filter: var(--glass-blur);
      border: 1px solid var(--glass-border);
      border-radius: 12px;
      padding: 20px 24px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 500;
      color: white;
    }

    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-secondary);
      display: none;
      border-top: 1px solid rgba(255,255,255,0.06);
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA */
    .cta-final {
      background: radial-gradient(circle at center, rgba(0,240,255,0.18) 0%, transparent 70%);
      text-align: center;
      padding: 100px 0;
    }

    /* 页脚 */
    #footer {
      border-top: 1px solid rgba(255,255,255,0.06);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }