/* roulang page: index */
:root {
      --primary-glow: #0AE06B;
      --deep-black: #0B0E14;
      --accent-orange: #FF6B35;
      --ice-white: #F0F2F5;
      --graphite: #1E2330;
      --data-blue: #3B82F6;
      --footer-deep: #070A10;
      --border-light: rgba(10, 224, 107, 0.25);
      --shadow-glow: 0 0 20px rgba(10, 224, 107, 0.15);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition-smooth: all 0.25s ease;
      --font-body: 'Noto Sans SC', sans-serif;
      --font-data: 'Inter', sans-serif;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--deep-black);
      color: var(--ice-white);
      line-height: 1.7;
      font-weight: 300;
      overflow-x: hidden;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 2rem;
    }

    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.2;
    }

    h2 {
      font-size: clamp(2rem, 4vw, 3rem);
      margin-bottom: 1rem;
      letter-spacing: -0.02em;
    }

    h3 {
      font-size: clamp(1.25rem, 2vw, 1.5rem);
      font-weight: 500;
    }

    .section-title {
      text-align: center;
      margin-bottom: 2.5rem;
    }
    .section-subtitle {
      text-align: center;
      color: rgba(240, 242, 245, 0.7);
      max-width: 700px;
      margin: 0 auto 3rem;
      font-size: 1.1rem;
    }

    a {
      color: var(--primary-glow);
      text-decoration: none;
      transition: var(--transition-smooth);
    }
    a:hover {
      color: var(--accent-orange);
      text-decoration: underline;
    }

    .btn {
      display: inline-block;
      font-weight: 600;
      padding: 0.8rem 2rem;
      border-radius: var(--radius-btn);
      transition: var(--transition-smooth);
      cursor: pointer;
      border: none;
      font-family: var(--font-body);
      font-size: 1rem;
      letter-spacing: 0.3px;
    }

    .btn-primary {
      background: var(--primary-glow);
      color: var(--deep-black);
      box-shadow: 0 4px 15px rgba(10, 224, 107, 0.3);
    }
    .btn-primary:hover {
      background: var(--accent-orange);
      color: white;
      transform: scale(1.03);
      box-shadow: 0 8px 20px rgba(255, 107, 53, 0.4);
    }

    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--primary-glow);
      color: var(--primary-glow);
    }
    .btn-secondary:hover {
      background: rgba(10, 224, 107, 0.1);
      border-color: var(--ice-white);
      color: var(--ice-white);
    }

    .btn-white {
      background: white;
      color: var(--deep-black);
    }
    .btn-white:hover {
      background: var(--ice-white);
      transform: scale(1.02);
    }

    /* 导航栏 */
    .navbar {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(11, 14, 20, 0.92);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(10, 224, 107, 0.2);
      padding: 0.8rem 0;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary-glow);
    }
    .logo i {
      font-size: 1.8rem;
    }
    .nav-menu {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-link {
      color: var(--ice-white);
      font-weight: 400;
      transition: var(--transition-smooth);
    }
    .nav-link:hover {
      color: var(--primary-glow);
      text-decoration: none;
    }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      color: var(--primary-glow);
      font-size: 1.8rem;
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .nav-menu {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: var(--deep-black);
        flex-direction: column;
        justify-content: center;
        gap: 2rem;
        font-size: 1.8rem;
        z-index: 999;
      }
      .nav-menu.active {
        display: flex;
      }
      .mobile-toggle {
        display: block;
      }
      .navbar .btn-primary {
        display: none;
      }
      .bottom-mobile-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: rgba(11, 14, 20, 0.98);
        border-top: 1px solid rgba(10,224,107,0.3);
        justify-content: space-around;
        padding: 0.6rem 0;
        z-index: 1000;
      }
      .bottom-mobile-nav a {
        color: var(--ice-white);
        font-size: 0.8rem;
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 0.2rem;
      }
    }
    @media (min-width: 769px) {
      .bottom-mobile-nav {
        display: none;
      }
    }

    /* Hero */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 20% 30%, rgba(10,224,107,0.12) 0%, transparent 60%);
      position: relative;
      overflow: hidden;
    }
    .hero-content {
      display: flex;
      align-items: center;
      gap: 3rem;
      flex-wrap: wrap;
    }
    .hero-text {
      flex: 1 1 50%;
    }
    .hero-visual {
      flex: 1 1 40%;
      position: relative;
      min-height: 400px;
    }
    .hero h1 {
      font-size: clamp(3rem, 6vw, 5rem);
      color: white;
      margin-bottom: 1.5rem;
    }
    .hero p {
      font-size: 1.25rem;
      color: rgba(240,242,245,0.8);
      margin-bottom: 2rem;
      max-width: 500px;
    }
    .data-stream {
      position: absolute;
      width: 100%;
      height: 100%;
      background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 200" opacity="0.15"><path d="M20 80 Q 60 20 100 80 T 180 80" stroke="%230AE06B" fill="none" stroke-width="2"/><circle cx="40" cy="80" r="3" fill="%230AE06B"/></svg>');
      background-size: cover;
    }
    @media (max-width: 768px) {
      .hero {
        min-height: 70vh;
      }
      .hero-visual {
        display: none;
      }
    }

    /* 数据看板 */
    .dashboard {
      background: var(--graphite);
      padding: 4rem 0;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
      text-align: center;
    }
    .stat-item {
      padding: 2rem 1rem;
      background: rgba(255,255,255,0.02);
      border-radius: var(--radius-card);
      border: 1px solid transparent;
      transition: var(--transition-smooth);
    }
    .stat-item:hover {
      border-color: var(--primary-glow);
    }
    .stat-number {
      font-family: var(--font-data);
      font-weight: 600;
      font-size: clamp(2rem, 3.5vw, 3rem);
      color: var(--primary-glow);
    }
    .stat-label {
      color: rgba(240,242,245,0.7);
      margin-top: 0.5rem;
    }
    @media (max-width: 1024px) {
      .stats-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 520px) {
      .stats-grid { grid-template-columns: 1fr; }
    }

    /* 服务矩阵 非对称网格 */
    .services {
      padding: 5rem 0;
    }
    .service-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr;
      gap: 1.5rem;
    }
    .service-card {
      background: var(--graphite);
      border-radius: var(--radius-card);
      padding: 2rem;
      border: 1px solid rgba(10,224,107,0.15);
      transition: var(--transition-smooth);
    }
    .service-card.large {
      grid-row: span 2;
    }
    .service-card:hover {
      border-color: var(--primary-glow);
      transform: translateY(-4px);
      box-shadow: var(--shadow-glow);
    }
    .service-icon {
      font-size: 2.5rem;
      color: var(--primary-glow);
      margin-bottom: 1rem;
    }
    @media (max-width: 768px) {
      .service-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 对比条 */
    .comparison {
      background: var(--graphite);
      padding: 4rem 0;
    }
    .table-wrap {
      overflow-x: auto;
      border-radius: var(--radius-card);
    }
    table {
      width: 100%;
      border-collapse: collapse;
      min-width: 700px;
    }
    th {
      text-align: left;
      padding: 1rem;
      background: rgba(10,224,107,0.1);
      color: var(--primary-glow);
    }
    td {
      padding: 1rem;
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    .highlight {
      color: var(--accent-orange);
      font-weight: 600;
    }

    /* 安全 */
    .security {
      padding: 5rem 0;
    }
    .security-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 2rem;
    }
    @media (max-width: 768px) {
      .security-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 480px) {
      .security-grid { grid-template-columns: 1fr; }
    }

    /* FAQ */
    .faq {
      padding: 5rem 0;
    }
    .accordion-item {
      background: var(--graphite);
      margin-bottom: 0.8rem;
      border-radius: 8px;
      border-left: 4px solid var(--primary-glow);
    }
    .accordion-btn {
      width: 100%;
      background: transparent;
      border: none;
      color: white;
      padding: 1.2rem;
      text-align: left;
      font-size: 1.1rem;
      font-weight: 500;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: rgba(0,0,0,0.2);
      padding: 0 1.2rem;
    }
    .accordion-content p {
      padding: 1rem 0;
    }

    /* CTA */
    .cta-block {
      background: linear-gradient(135deg, rgba(10,224,107,0.9) 0%, rgba(255,107,53,0.8) 100%);
      padding: 5rem 2rem;
      text-align: center;
      border-radius: 24px;
      margin: 3rem 0;
    }
    .cta-block h2 {
      color: var(--deep-black);
    }
    .cta-buttons {
      display: flex;
      gap: 1.5rem;
      justify-content: center;
      flex-wrap: wrap;
    }

    footer {
      background: var(--footer-deep);
      padding: 3rem 0 1rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }