/* roulang page: index */
:root {
      --deep-blue: #0A0E27;
      --bg-gradient-start: #0A0E27;
      --bg-gradient-end: #0F142E;
      --accent-cyan: #00C6D7;
      --accent-cyan-hover: #00E5F7;
      --warm-gold: #D4A843;
      --glass-bg: rgba(15, 25, 45, 0.6);
      --glass-border: rgba(0, 198, 215, 0.15);
      --glass-border-hover: rgba(0, 198, 215, 0.35);
      --text-primary: #E6EDF5;
      --text-secondary: #B0C4DE;
      --text-muted: #8899AA;
      --card-shadow: 0 8px 32px rgba(0,0,0,0.4);
      --card-hover-shadow: 0 12px 40px rgba(0,0,0,0.6);
      --radius-card: 16px;
      --radius-btn: 50px;
      --radius-input: 12px;
      --nav-height: 68px;
      --container-max: 1280px;
      --transition-smooth: all 0.25s ease-in-out;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      background: linear-gradient(180deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
      color: var(--text-primary);
      line-height: 1.6;
      min-height: 100vh;
      -webkit-font-smoothing: antialiased;
    }

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

    /* 导航栏 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      z-index: 1000;
      border-bottom: 1px solid rgba(0, 198, 215, 0.1);
      display: flex;
      align-items: center;
    }

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

    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: #FFFFFF;
      text-decoration: none;
      letter-spacing: 2px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      color: var(--accent-cyan);
      font-size: 2rem;
      filter: drop-shadow(0 0 8px rgba(0,198,215,0.7));
    }

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

    .nav-links a {
      color: var(--text-secondary);
      text-decoration: none;
      font-size: 0.95rem;
      font-weight: 500;
      transition: var(--transition-smooth);
      padding: 6px 0;
      border-bottom: 2px solid transparent;
    }

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

    .hamburger {
      display: none;
      background: none;
      border: none;
      color: var(--text-primary);
      font-size: 1.8rem;
      cursor: pointer;
    }

    /* 移动端导航 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: var(--nav-height);
      left: 0;
      width: 100%;
      height: calc(100vh - var(--nav-height));
      background: rgba(8, 12, 32, 0.98);
      backdrop-filter: blur(20px);
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 40px;
      z-index: 999;
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.3s ease;
    }
    .mobile-menu.open {
      display: flex;
      opacity: 1;
      pointer-events: auto;
    }
    .mobile-menu a {
      color: #E6EDF5;
      font-size: 1.6rem;
      text-decoration: none;
      font-weight: 500;
    }

    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      text-decoration: none;
      transition: var(--transition-smooth);
      cursor: pointer;
      border: none;
      letter-spacing: 0.5px;
    }

    .btn-primary {
      background: linear-gradient(135deg, #00C6D7, #0097A7);
      color: #FFFFFF;
      box-shadow: 0 0 20px rgba(0,198,215,0.5);
    }
    .btn-primary:hover {
      box-shadow: 0 0 32px rgba(0,198,215,0.8);
      filter: brightness(1.15);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent-cyan);
      color: var(--accent-cyan);
    }
    .btn-outline:hover {
      background: rgba(0,198,215,0.1);
      border-color: var(--accent-cyan-hover);
      color: #FFFFFF;
    }

    .btn-lg {
      padding: 18px 48px;
      font-size: 1.1rem;
    }

    /* Hero */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      padding-top: var(--nav-height);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      background-color: rgba(10, 14, 39, 0.7);
    }
    .hero-container {
      display: flex;
      align-items: center;
      gap: 48px;
      flex-wrap: wrap;
      width: 100%;
    }
    .hero-content {
      flex: 1 1 500px;
    }
    .hero h1 {
      font-size: clamp(2.5rem, 6vw, 3.6rem);
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 24px;
      background: linear-gradient(to right, #FFFFFF, #B0E0FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero .subtitle {
      font-size: 1.25rem;
      color: var(--text-secondary);
      margin-bottom: 40px;
      max-width: 550px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .hero-image {
      flex: 1 1 400px;
      display: flex;
      justify-content: center;
    }
    .hero-image img {
      max-width: 100%;
      height: auto;
      border-radius: var(--radius-card);
      box-shadow: 0 20px 50px rgba(0,0,0,0.5);
    }

    /* 版块通用 */
    section {
      padding: 90px 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 600;
      text-align: center;
      margin-bottom: 16px;
      color: #FFFFFF;
    }
    .section-subtitle {
      text-align: center;
      color: var(--text-secondary);
      margin-bottom: 60px;
      font-size: 1.1rem;
    }

    /* 玻璃卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      transition: var(--transition-smooth);
      padding: 32px;
    }
    .glass-card:hover {
      border-color: var(--glass-border-hover);
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-4px);
    }

    /* Features 不对称网格 */
    .features-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr;
      gap: 24px;
    }
    .feature-icon {
      font-size: 2.2rem;
      color: var(--accent-cyan);
      margin-bottom: 18px;
    }
    .feature-card h3 {
      font-size: 1.4rem;
      margin-bottom: 12px;
    }
    .feature-card p {
      color: var(--text-secondary);
      font-size: 0.95rem;
    }

    /* 场景卡片 */
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .scene-card {
      display: flex;
      gap: 24px;
      align-items: center;
    }
    .scene-card img {
      width: 140px;
      height: 140px;
      object-fit: cover;
      border-radius: 12px;
    }
    .scene-text h3 {
      font-size: 1.3rem;
      margin-bottom: 8px;
    }

    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-highlight {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--warm-gold);
    }

    /* 价格卡片 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      align-items: stretch;
    }
    .pricing-card.recommended {
      border-color: var(--warm-gold);
      position: relative;
      transform: scale(1.03);
    }
    .badge {
      background: var(--warm-gold);
      color: #0A0E27;
      padding: 4px 16px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
      position: absolute;
      top: -12px;
      right: 24px;
    }
    .price {
      font-size: 2.6rem;
      font-weight: 700;
      color: #FFFFFF;
    }

    /* FAQ */
    .faq-item {
      background: rgba(20, 30, 50, 0.5);
      border-radius: var(--radius-input);
      margin-bottom: 12px;
      border: 1px solid rgba(255,255,255,0.05);
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 500;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 1.1rem;
    }
    .faq-answer {
      padding: 0 24px 18px;
      color: var(--text-secondary);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* Footer CTA */
    .footer-cta {
      background: #060A1A;
      text-align: center;
    }
    .footer-links {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 40px;
      margin: 50px 0;
    }
    .social-icons i {
      font-size: 1.4rem;
      margin: 0 10px;
      color: var(--accent-cyan);
      border: 1px solid var(--accent-cyan);
      border-radius: 50%;
      padding: 8px;
    }

    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: 1fr 1fr; }
      .cases-grid { grid-template-columns: 1fr; }
    }

    @media (max-width: 768px) {
      .hamburger { display: block; }
      .nav-links { display: none; }
      .hero-container { flex-direction: column; text-align: center; }
      .features-grid, .scenarios-grid, .pricing-grid { grid-template-columns: 1fr; }
      .scene-card { flex-direction: column; }
      .footer-links { grid-template-columns: 1fr 1fr; }
    }