/* roulang page: index */
:root {
      --deep-space: #0A0E27;
      --card-bg: rgba(255,255,255,0.03);
      --border-light: rgba(255,255,255,0.06);
      --cyan: #00F0FF;
      --cyan-dark: #0099FF;
      --violet: #7B2FFF;
      --white: #FFFFFF;
      --text-main: #E8ECF4;
      --text-dim: #9BA4B5;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --glow-cyan: 0 0 20px rgba(0,240,255,0.3);
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-number: 'Inter', 'SF Pro Display', sans-serif;
      --container-max: 1280px;
      --section-padding: 120px 24px;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--deep-space);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    img {
      max-width: 100%;
      height: auto;
      display: block;
      border-radius: var(--radius-md);
    }

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

    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      transition: background 0.3s, padding 0.3s;
      padding: 0 24px;
    }
    .nav.scrolled {
      background: rgba(10, 14, 39, 0.95);
      box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--container-max);
      margin: 0 auto;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 24px;
      color: var(--cyan);
      letter-spacing: 1px;
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--cyan), var(--violet));
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      color: #0A0E27;
      font-weight: 700;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
    }
    .nav-links a {
      color: var(--text-dim);
      font-weight: 500;
      font-size: 15px;
      transition: color 0.2s;
      letter-spacing: 0.3px;
    }
    .nav-links a:hover {
      color: var(--cyan);
    }
    .btn-cta-nav {
      background: linear-gradient(135deg, var(--cyan), var(--cyan-dark));
      color: #0A0E27;
      font-weight: 700;
      padding: 10px 24px;
      border-radius: 30px;
      font-size: 15px;
      letter-spacing: 0.5px;
      box-shadow: var(--glow-cyan);
      transition: transform 0.2s, box-shadow 0.2s;
      border: none;
      cursor: pointer;
      display: inline-block;
    }
    .btn-cta-nav:hover {
      transform: scale(1.04);
      box-shadow: 0 0 28px rgba(0,240,255,0.5);
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      color: var(--text-main);
      font-size: 28px;
      cursor: pointer;
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
    }

    /* 板块通用 */
    section {
      padding: var(--section-padding);
    }
    .section-title {
      font-family: var(--font-title);
      font-size: 38px;
      font-weight: 800;
      margin-bottom: 16px;
      color: var(--white);
      line-height: 1.3;
    }
    .section-desc {
      color: var(--text-dim);
      font-size: 17px;
      max-width: 700px;
      margin-bottom: 48px;
    }

    /* Hero */
    .hero {
      padding: 160px 24px 100px;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      background: radial-gradient(circle at 80% 40%, rgba(123,47,255,0.2) 0%, rgba(10,14,39,0) 60%), var(--deep-space);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      max-width: var(--container-max);
      margin: 0 auto;
      width: 100%;
    }
    .hero-left {
      flex: 1 1 55%;
    }
    .hero-right {
      flex: 1 1 45%;
      display: flex;
      justify-content: center;
      animation: float 6s ease-in-out infinite;
    }
    .hero h1 {
      font-family: var(--font-title);
      font-size: 52px;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 20px;
      background: linear-gradient(to right, #fff, #b0f0ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-dim);
      margin-bottom: 36px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--cyan), var(--cyan-dark));
      color: #0A0E27;
      font-weight: 700;
      padding: 14px 36px;
      border-radius: 40px;
      font-size: 16px;
      box-shadow: 0 0 22px rgba(0,240,255,0.4);
      transition: all 0.25s;
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      box-shadow: 0 0 35px rgba(0,240,255,0.7);
      transform: scale(1.03);
    }
    .btn-secondary {
      background: transparent;
      border: 1px solid var(--cyan);
      color: var(--cyan);
      padding: 14px 36px;
      border-radius: 40px;
      font-weight: 600;
      transition: all 0.25s;
    }
    .btn-secondary:hover {
      background: rgba(0,240,255,0.08);
      border-color: #fff;
    }
    .glass-card-img {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(20px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 24px;
      padding: 16px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.6);
      transform: rotate(1deg);
    }
    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-12px); }
      100% { transform: translateY(0px); }
    }

    /* 亮点网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      margin-top: 20px;
    }
    .feature-card {
      background: var(--card-bg);
      backdrop-filter: blur(18px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 32px;
      transition: all 0.3s ease;
    }
    .feature-card:hover {
      background: rgba(255,255,255,0.06);
      border-color: rgba(0,240,255,0.4);
      box-shadow: 0 0 25px rgba(0,240,255,0.15);
    }
    .feature-icon {
      font-size: 40px;
      color: var(--cyan);
      margin-bottom: 20px;
    }
    .feature-card h3 {
      font-size: 22px;
      margin-bottom: 12px;
      font-weight: 700;
    }

    /* 服务瀑布流 */
    .service-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .service-row.reverse {
      flex-direction: row-reverse;
    }
    .service-img {
      flex: 1;
    }
    .service-text {
      flex: 1;
    }
    .service-text h3 {
      font-size: 30px;
      margin-bottom: 18px;
    }
    .feature-list {
      list-style: none;
      margin-top: 20px;
    }
    .feature-list li {
      margin-bottom: 14px;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .feature-list li::before {
      content: "●";
      color: var(--cyan);
      font-size: 20px;
    }

    /* 对比表 */
    .compare-table {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      margin-top: 24px;
    }
    .plan-card {
      background: rgba(255,255,255,0.02);
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: 20px;
      padding: 32px;
    }
    .plan-card.recommend {
      border-color: var(--cyan);
      box-shadow: 0 0 28px rgba(0,240,255,0.25);
      position: relative;
    }
    .badge {
      background: var(--violet);
      color: white;
      padding: 6px 18px;
      border-radius: 20px;
      font-size: 14px;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 16px;
    }
    .check {
      color: var(--cyan);
      font-weight: bold;
    }

    /* 数字墙 */
    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 30px;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 700;
      background: linear-gradient(135deg, var(--cyan), #fff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .faq-item {
      background: rgba(255,255,255,0.02);
      border: 1px solid rgba(255,255,255,0.05);
      border-radius: 14px;
      padding: 16px 20px;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 700;
      display: flex;
      justify-content: space-between;
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(30deg, var(--cyan), var(--violet));
      text-align: center;
      padding: 80px 24px;
      border-radius: 30px;
      margin: 0 24px 60px;
    }

    /* Footer */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 60px 0;
    }

    @media (max-width: 1024px) {
      .hero-grid { flex-direction: column; }
      .features-grid { grid-template-columns: 1fr 1fr; }
      .faq-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links, .btn-cta-nav { display: none; }
      .hamburger { display: block; }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 16px;
        left: 50%;
        transform: translateX(-50%);
        background: rgba(20,24,45,0.9);
        backdrop-filter: blur(24px);
        border-radius: 40px;
        padding: 10px 24px;
        gap: 24px;
        z-index: 110;
        border: 1px solid rgba(255,255,255,0.1);
      }
      .hero h1 { font-size: 36px; }
      .service-row, .service-row.reverse { flex-direction: column; }
      .compare-table { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }