/* roulang page: index */
:root {
      --deep-blue: #0B1D3A;
      --alt-blue: #0F2440;
      --darker-blue: #0A1929;
      --rose-gold: #C88A6B;
      --electric-blue: #3B82F6;
      --ice-glow: #60A5FA;
      --text-primary: #FFFFFF;
      --text-body: #B0C4DE;
      --text-muted: #6B7FA3;
      --glass-bg: rgba(255,255,255,0.03);
      --glass-border: rgba(255,255,255,0.08);
      --glass-hover-bg: rgba(255,255,255,0.06);
      --glass-hover-border: rgba(255,255,255,0.2);
      --card-radius-lg: 16px;
      --card-radius-md: 12px;
      --btn-radius: 50px;
      --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      --font-sans: 'Inter', system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-mono: 'DM Mono', monospace;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--deep-blue);
      color: var(--text-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

    .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, 29, 58, 0.7);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255,255,255,0.06);
      z-index: 1000;
      display: flex;
      align-items: center;
      transition: background 0.3s;
    }

    .nav.scrolled {
      background: rgba(11, 29, 58, 0.95);
    }

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

    .logo {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--text-primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo span {
      color: var(--rose-gold);
    }

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

    .nav-links a {
      color: var(--text-body);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 8px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--electric-blue);
      transition: width 0.3s;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: white;
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .btn-ghost {
      background: transparent;
      border: 1.5px solid rgba(255,255,255,0.3);
      color: white;
      padding: 10px 24px;
      border-radius: var(--btn-radius);
      font-weight: 600;
      font-size: 0.9rem;
      transition: var(--transition-smooth);
      display: inline-block;
      text-align: center;
    }

    .btn-ghost:hover {
      border-color: white;
      background: rgba(255,255,255,0.05);
      transform: translateY(-1px);
    }

    .btn-primary {
      background: var(--electric-blue);
      color: white;
      border: none;
      padding: 12px 28px;
      border-radius: var(--btn-radius);
      font-weight: 600;
      font-size: 1rem;
      box-shadow: 0 0 20px rgba(59,130,246,0.5);
      transition: var(--transition-smooth);
      display: inline-block;
      text-align: center;
      cursor: pointer;
    }

    .btn-primary:hover {
      background: #4B92FF;
      box-shadow: 0 0 30px rgba(59,130,246,0.7);
      transform: translateY(-2px);
    }

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

    .hamburger span {
      width: 24px;
      height: 2px;
      background: white;
      border-radius: 2px;
      transition: 0.3s;
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 280px;
      height: 100vh;
      background: #0B1D3A;
      backdrop-filter: blur(20px);
      padding: 80px 30px;
      display: flex;
      flex-direction: column;
      gap: 24px;
      transition: right 0.3s ease;
      z-index: 999;
      border-left: 1px solid rgba(255,255,255,0.08);
    }

    .mobile-menu.open {
      right: 0;
    }

    .mobile-menu a {
      font-size: 1.2rem;
      font-weight: 500;
      color: var(--text-body);
      border-bottom: 1px solid rgba(255,255,255,0.05);
      padding-bottom: 12px;
    }

    /* Hero */
    .hero {
      padding: 140px 0 100px;
      display: flex;
      align-items: center;
      min-height: 90vh;
    }

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

    .hero-tag {
      color: var(--rose-gold);
      font-size: 0.9rem;
      letter-spacing: 1px;
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .hero-tag::before {
      content: '';
      width: 32px;
      height: 1px;
      background: var(--rose-gold);
    }

    h1 {
      font-size: clamp(2rem, 5vw, 3.5rem);
      font-weight: 800;
      color: var(--text-primary);
      line-height: 1.2;
      margin-bottom: 24px;
    }

    .hero-desc {
      font-size: 1.125rem;
      color: var(--text-body);
      margin-bottom: 36px;
      max-width: 500px;
    }

    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }

    .hero-stats {
      display: flex;
      gap: 32px;
      flex-wrap: wrap;
    }

    .stat-item {
      display: flex;
      flex-direction: column;
    }

    .stat-number {
      font-family: var(--font-mono);
      font-size: 1.8rem;
      font-weight: 500;
      color: white;
    }

    .stat-label {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    .hero-image {
      background: rgba(255,255,255,0.03);
      border: 1px solid var(--glass-border);
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 0 30px rgba(96,165,250,0.1);
      backdrop-filter: blur(4px);
    }

    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/3;
    }

    /* 通用区块 */
    section {
      padding: 100px 0;
    }

    h2 {
      font-size: clamp(1.5rem, 3.5vw, 2.5rem);
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: 16px;
    }

    .section-sub {
      color: var(--text-body);
      margin-bottom: 48px;
      font-size: 1.1rem;
    }

    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--card-radius-lg);
      padding: 32px;
      transition: var(--transition-smooth);
    }

    .glass-card:hover {
      background: var(--glass-hover-bg);
      border-color: var(--glass-hover-border);
      box-shadow: 0 0 20px rgba(96,165,250,0.15);
      transform: translateY(-4px);
    }

    .icon-circle {
      width: 64px;
      height: 64px;
      background: rgba(200,138,107,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--rose-gold);
      font-size: 28px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

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

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .feature-list {
      list-style: none;
      margin-top: 16px;
    }

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

    .feature-list li::before {
      content: '•';
      color: var(--rose-gold);
      font-weight: bold;
    }

    .tag {
      display: inline-block;
      border: 1px solid var(--rose-gold);
      color: var(--rose-gold);
      padding: 4px 12px;
      border-radius: 30px;
      font-size: 0.8rem;
      margin-right: 8px;
    }

    .data-card {
      background: rgba(255,255,255,0.02);
      border: 1px solid rgba(255,255,255,0.05);
      border-radius: var(--card-radius-lg);
      padding: 32px;
      text-align: center;
    }

    .data-number {
      font-family: var(--font-mono);
      font-size: 2.5rem;
      color: var(--electric-blue);
      font-weight: 500;
    }

    .accordion {
      max-width: 800px;
      margin: 0 auto;
    }

    .accordion-item {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--card-radius-md);
      margin-bottom: 12px;
      overflow: hidden;
    }

    .accordion-header {
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      color: white;
      background: transparent;
      border: none;
      width: 100%;
      text-align: left;
      font-size: 1.1rem;
    }

    .accordion-icon {
      color: var(--rose-gold);
      font-size: 1.5rem;
      transition: transform 0.3s;
    }

    .accordion-body {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding: 0 24px;
    }

    .accordion-body p {
      padding-bottom: 20px;
      color: var(--text-body);
    }

    .active-acc .accordion-body {
      max-height: 200px;
    }

    .cta-band {
      background: #0A1929;
      background-image: radial-gradient(circle at 30% 30%, rgba(59,130,246,0.08) 0%, transparent 60%);
      text-align: center;
      padding: 80px 0;
    }

    .trust-badges {
      display: flex;
      justify-content: center;
      gap: 32px;
      margin-top: 32px;
      flex-wrap: wrap;
      color: var(--text-muted);
    }

    footer {
      background: var(--deep-blue);
      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;
    }

    .footer-col h4 {
      color: white;
      margin-bottom: 20px;
    }

    .footer-col a, .footer-col p {
      color: var(--text-body);
      font-size: 0.9rem;
      margin-bottom: 10px;
      display: block;
    }

    .footer-col a:hover {
      color: white;
    }

    .copyright {
      border-top: 1px solid rgba(255,255,255,0.05);
      margin-top: 40px;
      padding-top: 20px;
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    @media (max-width: 1024px) {
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: 1fr; }
      .hero-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
      .nav-links { display: none; }
      .hamburger { display: flex; }
    }

    @media (max-width: 768px) {
      .grid-2, .grid-4 { grid-template-columns: 1fr; }
      .hero { padding: 100px 0 60px; }
      section { padding: 60px 0; }
    }