/* roulang page: index */
:root {
      --bg-deep: #0A0E27;
      --bg-darker: #060B1F;
      --primary-cyan: #00F0FF;
      --secondary-pink: #FF3CAC;
      --gold: #FFD700;
      --text-body: #E0E6F0;
      --text-muted: #8892B0;
      --glass-bg: rgba(255, 255, 255, 0.04);
      --glass-border: rgba(255, 255, 255, 0.08);
      --glass-hover-bg: rgba(255, 255, 255, 0.08);
      --glass-hover-border: rgba(0, 240, 255, 0.3);
      --card-radius: 16px;
      --btn-radius: 8px;
      --blur-amount: 20px;
      --transition-speed: 0.3s;
      --font-cn: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-en: "Inter", "SF Pro Display", sans-serif;
      --container-max: 1280px;
    }

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

    body {
      font-family: var(--font-cn);
      background-color: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      outline: none;
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(10, 14, 39, 0.75);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid transparent;
      background-image: linear-gradient(to right, #00F0FF, #FF3CAC, transparent);
      background-position: bottom;
      background-size: 100% 1px;
      background-repeat: no-repeat;
      z-index: 1000;
      transition: background 0.3s ease;
    }

    .navbar.scrolled {
      background: rgba(10, 14, 39, 0.92);
    }

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

    .logo {
      font-family: var(--font-en);
      font-weight: 700;
      font-size: 1.5rem;
      background: linear-gradient(135deg, #00F0FF, #0088CC);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: -0.5px;
    }

    .nav-links {
      display: flex;
      gap: 2rem;
      list-style: none;
      align-items: center;
    }

    .nav-links a {
      color: var(--text-body);
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      position: relative;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-cyan);
    }

    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary-cyan);
    }

    .nav-cta {
      background: transparent;
      border: 1px solid rgba(0, 240, 255, 0.4);
      color: var(--primary-cyan);
      padding: 10px 24px;
      border-radius: var(--btn-radius);
      font-weight: 600;
      backdrop-filter: blur(8px);
      transition: all var(--transition-speed);
      font-size: 0.9rem;
    }

    .nav-cta:hover {
      border-color: var(--primary-cyan);
      background: rgba(0, 240, 255, 0.08);
      box-shadow: 0 0 20px rgba(0, 240, 255, 0.2);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      color: var(--text-body);
      font-size: 1.5rem;
      border: none;
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 16px;
      left: 50%;
      transform: translateX(-50%);
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-radius: 40px;
      padding: 8px 20px;
      z-index: 999;
      box-shadow: 0 8px 24px rgba(0,0,0,0.5);
      border: 1px solid rgba(255,255,255,0.1);
    }

    .mobile-bottom-nav ul {
      display: flex;
      gap: 1.8rem;
      list-style: none;
      align-items: center;
    }

    .mobile-bottom-nav a {
      color: var(--text-muted);
      font-size: 1.2rem;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 2px;
    }

    .mobile-bottom-nav .center-cta {
      background: linear-gradient(135deg, #00F0FF, #0088CC);
      color: #0A0E27;
      width: 44px;
      height: 44px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      box-shadow: 0 0 20px rgba(0,240,255,0.5);
      margin-top: -20px;
    }

    /* Hero */
    .hero {
      padding: 140px 0 100px;
      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(255,60,172,0.1) 0%, transparent 50%);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-content h1 {
      font-size: clamp(2.5rem, 5vw, 4rem);
      font-weight: 800;
      letter-spacing: -0.02em;
      line-height: 1.15;
      margin-bottom: 1.5rem;
      background: linear-gradient(to right, #fff, #E0E6F0);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-sub {
      font-size: 1.25rem;
      color: var(--text-muted);
      margin-bottom: 2rem;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 2.5rem;
    }

    .btn-primary {
      background: linear-gradient(135deg, #00F0FF, #0088CC);
      color: #0A0E27;
      font-weight: 700;
      padding: 14px 36px;
      border-radius: var(--btn-radius);
      box-shadow: 0 0 24px rgba(0,240,255,0.35);
      transition: all 0.3s;
      border: none;
    }

    .btn-primary:hover {
      box-shadow: 0 0 40px rgba(0,240,255,0.55);
      transform: scale(1.03);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid rgba(0,240,255,0.4);
      color: var(--primary-cyan);
      padding: 14px 36px;
      border-radius: var(--btn-radius);
      backdrop-filter: blur(8px);
      transition: all 0.3s;
      font-weight: 600;
    }

    .btn-outline:hover {
      border-color: var(--primary-cyan);
      background: rgba(0,240,255,0.08);
      box-shadow: 0 0 20px rgba(0,240,255,0.2);
    }

    .hero-stats {
      display: flex;
      gap: 2rem;
    }

    .hero-stat {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary-cyan);
      text-shadow: 0 0 12px rgba(0,240,255,0.5);
    }

    .hero-stat small {
      display: block;
      font-size: 0.85rem;
      color: var(--text-muted);
      font-weight: 400;
    }

    .dashboard-card {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(16px);
      border-radius: 24px;
      padding: 28px;
      border: 1px solid rgba(255,255,255,0.08);
      box-shadow: 0 0 30px rgba(0,240,255,0.1);
    }

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

    .section-title {
      font-size: clamp(2rem, 4vw, 2.8rem);
      font-weight: 700;
      text-align: center;
      margin-bottom: 1rem;
    }

    .section-sub {
      color: var(--text-muted);
      text-align: center;
      max-width: 600px;
      margin: 0 auto 3rem;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 24px;
    }

    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-radius: var(--card-radius);
      padding: 32px 28px;
      border: 1px solid var(--glass-border);
      transition: all 0.3s ease;
    }

    .glass-card:hover {
      transform: translateY(-4px);
      border-color: var(--glass-hover-border);
      box-shadow: 0 8px 32px rgba(0,240,255,0.12), inset 0 0 0 1px rgba(0,240,255,0.15);
      background: var(--glass-hover-bg);
    }

    .feature-icon {
      font-size: 2.2rem;
      margin-bottom: 1.2rem;
      color: var(--primary-cyan);
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 0.8rem;
    }

    .scenario-row {
      display: flex;
      align-items: center;
      gap: 40px;
      margin-bottom: 60px;
    }

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

    .scenario-img {
      flex: 1;
      background: rgba(255,255,255,0.05);
      border-radius: 20px;
      overflow: hidden;
    }

    .scenario-text {
      flex: 1;
    }

    .pricing-card {
      position: relative;
      text-align: center;
    }

    .pricing-card.featured {
      transform: translateY(-8px);
      border-color: rgba(255,215,0,0.3);
      box-shadow: 0 0 24px rgba(255,60,172,0.2);
    }

    .badge {
      background: var(--secondary-pink);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      position: absolute;
      top: -12px;
      right: 20px;
    }

    .price {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--primary-cyan);
    }

    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding: 18px 0;
    }

    .faq-question {
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }

    .cta-banner {
      background: #060B1F;
      text-align: center;
      padding: 80px 0;
      border-radius: 24px;
      margin: 0 24px;
    }

    footer {
      background: #060B1F;
      padding: 60px 0 30px;
      color: var(--text-muted);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .scenario-row { flex-direction: column; }
      .scenario-row.reverse { flex-direction: column; }
    }

    @media (max-width: 768px) {
      .nav-links, .nav-cta { display: none; }
      .mobile-menu-btn { display: block; }
      .mobile-bottom-nav { display: block; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }