/* roulang page: index */
:root {
      --primary-deep: #0B1E2E;
      --primary-dark: #132D40;
      --accent-neon: #00E5A0;
      --accent-purple: #A855F7;
      --glass-bg: rgba(11, 30, 46, 0.7);
      --glass-border: rgba(0, 229, 160, 0.15);
      --text-primary: #FFFFFF;
      --text-body: #B0C7D8;
      --text-muted: #6B8A9E;
      --radius-card: 16px;
      --radius-inner: 12px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-glow: 0 0 24px rgba(0, 229, 160, 0.4);
      --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    body {
      font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", 'Inter', sans-serif;
      background: linear-gradient(135deg, #0B1E2E 0%, #132D40 100%);
      color: var(--text-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(11, 30, 46, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid transparent;
      display: flex;
      align-items: center;
      justify-content: center;
      z-index: 1000;
      transition: var(--transition-smooth);
    }

    .nav.scrolled {
      border-bottom: 1px solid rgba(0, 229, 160, 0.2);
      box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1280px;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      text-decoration: none;
      color: var(--accent-neon);
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: -0.5px;
    }

    .logo svg {
      width: 32px;
      height: 32px;
      fill: none;
      stroke: var(--accent-neon);
      stroke-width: 2;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      text-decoration: none;
      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(--accent-neon);
    }

    .btn-primary {
      background: linear-gradient(135deg, #00E5A0, #00C48A);
      border: none;
      color: #0B1E2E;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: 30px;
      font-size: 0.95rem;
      cursor: pointer;
      box-shadow: 0 0 18px rgba(0, 229, 160, 0.35);
      transition: var(--transition-smooth);
      text-decoration: none;
      display: inline-block;
      letter-spacing: 0.3px;
    }

    .btn-primary:hover {
      box-shadow: 0 0 32px rgba(0, 229, 160, 0.6);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent-neon);
      color: var(--accent-neon);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: 30px;
      font-size: 0.95rem;
      cursor: pointer;
      transition: var(--transition-smooth);
      text-decoration: none;
      display: inline-block;
    }

    .btn-outline:hover {
      background: rgba(0, 229, 160, 0.1);
      transform: translateY(-2px);
    }

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

    .hamburger span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--accent-neon);
      transition: 0.3s;
    }

    /* 移动端菜单 */
    .mobile-menu {
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: rgba(8, 20, 32, 0.96);
      backdrop-filter: blur(20px);
      flex-direction: column;
      align-items: center;
      gap: 28px;
      padding: 40px 20px;
      display: none;
      z-index: 999;
      border-bottom: 1px solid rgba(0,229,160,0.2);
    }

    .mobile-menu.active {
      display: flex;
    }

    /* Hero */
    .hero {
      padding: 140px 0 100px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 60px;
      position: relative;
    }

    .hero-content {
      flex: 1;
    }

    .hero h1 {
      font-size: 56px;
      font-weight: 800;
      line-height: 1.15;
      color: white;
      letter-spacing: -0.02em;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 22px;
      color: var(--text-body);
      margin-bottom: 24px;
      font-weight: 400;
    }

    .hero-desc {
      color: var(--text-muted);
      margin-bottom: 36px;
      font-size: 18px;
      max-width: 480px;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .hero-visual {
      flex: 1;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      min-height: 420px;
      border-radius: 32px;
      position: relative;
      backdrop-filter: blur(8px);
      border: 1px solid rgba(0,229,160,0.2);
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px) saturate(180%);
      border-radius: 24px;
      border: 1px solid var(--glass-border);
      padding: 28px;
      color: white;
      width: 80%;
    }

    /* 板块通用 */
    section {
      padding: 80px 0;
    }

    .section-title {
      font-size: 40px;
      font-weight: 700;
      color: white;
      text-align: center;
      margin-bottom: 16px;
    }

    .section-sub {
      text-align: center;
      color: var(--text-muted);
      margin-bottom: 56px;
      font-size: 18px;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .feature-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: var(--transition-smooth);
      text-align: center;
    }

    .feature-card:hover {
      border-color: var(--accent-neon);
      box-shadow: 0 16px 48px rgba(0,229,160,0.15);
    }

    .icon-placeholder {
      font-size: 42px;
      margin-bottom: 20px;
      color: var(--accent-neon);
    }

    .feature-card h3 {
      color: white;
      font-size: 24px;
      margin-bottom: 12px;
    }

    /* 产品功能分组 */
    .product-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }

    .product-text {
      flex: 1;
    }

    .product-text h3 {
      font-size: 28px;
      color: white;
      margin-bottom: 24px;
    }

    .product-list {
      list-style: none;
    }

    .product-list li {
      margin-bottom: 14px;
      display: flex;
      align-items: center;
      gap: 12px;
      color: var(--text-body);
    }

    .product-list li::before {
      content: "●";
      color: var(--accent-neon);
      font-size: 20px;
    }

    .product-img {
      flex: 1;
      background-size: cover;
      background-position: center;
      min-height: 300px;
      border-radius: 24px;
      border: 1px solid rgba(0,229,160,0.2);
    }

    .scenario-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      border-radius: var(--radius-card);
      overflow: hidden;
      border: 1px solid var(--glass-border);
    }

    .scenario-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }

    .scenario-card h3 {
      color: white;
      padding: 20px 20px 8px;
    }

    .scenario-card p {
      padding: 0 20px 20px;
      color: var(--text-muted);
    }

    .stats {
      display: flex;
      justify-content: space-around;
      margin-bottom: 60px;
    }

    .stat-item {
      text-align: center;
    }

    .stat-number {
      font-size: 48px;
      font-weight: 800;
      background: linear-gradient(135deg, #00E5A0, #A855F7);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .price-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      border-radius: var(--radius-card);
      padding: 36px 28px;
      border: 1px solid var(--glass-border);
      text-align: center;
    }

    .price-card.featured {
      border: 2px solid var(--accent-neon);
      box-shadow: 0 0 32px rgba(0,229,160,0.25);
      position: relative;
    }

    .badge {
      background: var(--accent-purple);
      color: white;
      padding: 4px 16px;
      border-radius: 20px;
      font-size: 13px;
      display: inline-block;
      margin-bottom: 16px;
    }

    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.1);
      padding: 20px 0;
      cursor: pointer;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-muted);
      margin-top: 8px;
    }

    .cta-section {
      background: linear-gradient(135deg, #0B1E2E, #132D40);
      text-align: center;
      padding: 80px 20px;
      border-radius: 32px;
    }

    footer {
      background: #091820;
      padding: 60px 0 30px;
    }

    @media (max-width: 1024px) {
      .grid-3, .pricing-grid { grid-template-columns: repeat(2, 1fr); }
      .hero { flex-direction: column; }
      .product-row { flex-direction: column; }
    }

    @media (max-width: 640px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .grid-3, .pricing-grid { grid-template-columns: 1fr; }
      .hero h1 { font-size: 38px; }
      .section-title { font-size: 30px; }
    }