/* roulang page: index */
:root {
      --primary: #0A0E27;
      --accent: #00F0FF;
      --gold: #FFB800;
      --glass-bg: rgba(255, 255, 255, 0.04);
      --glass-border: rgba(0, 240, 255, 0.15);
      --glass-hover-border: rgba(0, 240, 255, 0.4);
      --text-strong: #FFFFFF;
      --text-body: rgba(255, 255, 255, 0.75);
      --text-weak: rgba(255, 255, 255, 0.45);
      --radius-card: 16px;
      --radius-small: 12px;
      --radius-btn: 8px;
      --shadow-glow: 0 0 24px rgba(0, 240, 255, 0.5), 0 0 60px rgba(0, 240, 255, 0.15);
      --shadow-glow-hover: 0 0 32px rgba(0, 240, 255, 0.7), 0 0 80px rgba(0, 240, 255, 0.25);
      --transition-default: all 0.3s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: 'Inter', 'SF Pro Text', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background-color: var(--primary);
      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;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-default);
    }
    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: none;
    }
    /* 导航栏 */
    .nav-bar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(10, 14, 39, 0.75);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border-bottom: 1px solid transparent;
      background-image: linear-gradient(rgba(10,14,39,0.75), rgba(10,14,39,0.75)), linear-gradient(90deg, var(--accent), transparent);
      background-origin: border-box;
      background-clip: padding-box, border-box;
      padding: 0 24px;
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: -0.02em;
      color: var(--text-strong);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      width: 20px;
      height: 20px;
      background: var(--accent);
      clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
      display: inline-block;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-link {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-body);
      padding: 8px 4px;
      position: relative;
      transition: color 0.2s;
    }
    .nav-link:hover {
      color: var(--text-strong);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent);
      box-shadow: 0 0 10px var(--accent);
      transition: width 0.25s ease;
    }
    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-strong);
      transition: var(--transition-default);
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(10, 14, 39, 0.95);
      backdrop-filter: blur(32px);
      z-index: 200;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
    }
    .mobile-menu a {
      font-size: 2rem;
      font-weight: 600;
      color: var(--text-strong);
    }
    .mobile-menu .close-btn {
      position: absolute;
      top: 24px;
      right: 24px;
      font-size: 2rem;
      color: var(--text-strong);
      background: none;
      border: none;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu.active {
        display: flex;
      }
    }
    /* Hero */
    .hero {
      min-height: 85vh;
      display: flex;
      align-items: center;
      padding-top: 72px;
      background: radial-gradient(circle at 20% 30%, rgba(0,240,255,0.08) 0%, transparent 50%);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      width: 100%;
    }
    .hero-left h1 {
      font-size: 3.4rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      color: var(--text-strong);
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero-left .subtitle {
      font-size: 1.1rem;
      color: var(--text-body);
      margin-bottom: 36px;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: #0A0E27;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      box-shadow: var(--shadow-glow);
      transition: var(--transition-default);
      font-size: 1rem;
      letter-spacing: 0.3px;
    }
    .btn-primary:hover {
      box-shadow: var(--shadow-glow-hover);
      transform: translateY(-2px);
    }
    .btn-secondary {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.3);
      color: var(--text-strong);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 500;
      transition: var(--transition-default);
    }
    .btn-secondary:hover {
      border-color: var(--accent);
      color: var(--accent);
    }
    .hero-right {
      position: relative;
      display: flex;
      justify-content: center;
    }
    .hero-image {
      width: 100%;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
      position: relative;
    }
    .hero-image img {
      width: 100%;
      object-fit: cover;
      filter: brightness(0.8);
    }
    .floating-badge {
      position: absolute;
      bottom: 20px;
      right: -10px;
      background: rgba(10,14,39,0.85);
      backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: 20px;
      padding: 12px 24px;
      color: var(--gold);
      font-weight: 700;
      font-size: 1.2rem;
      box-shadow: 0 8px 24px rgba(0,0,0,0.4);
    }
    @media (max-width: 1024px) {
      .hero-grid {
        gap: 32px;
      }
    }
    @media (max-width: 768px) {
      .hero {
        min-height: 70vh;
      }
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-left h1 {
        font-size: 2.6rem;
      }
      .hero-left .subtitle {
        margin-left: auto;
        margin-right: auto;
      }
      .hero-buttons {
        justify-content: center;
      }
      .hero-right {
        order: -1;
      }
    }
    /* 通用板块标题 */
    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--text-strong);
      margin-bottom: 48px;
      letter-spacing: -0.02em;
      text-align: center;
    }
    @media (max-width: 768px) {
      .section-title {
        font-size: 2rem;
      }
    }
    /* 亮点网格 */
    .highlights {
      padding: 80px 0;
    }
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .highlight-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      transition: var(--transition-default);
    }
    .highlight-card:hover {
      transform: translateY(-6px);
      border-color: var(--glass-hover-border);
      box-shadow: 0 8px 32px rgba(0,240,255,0.12);
    }
    .highlight-icon {
      font-size: 2.2rem;
      color: var(--accent);
      margin-bottom: 20px;
    }
    .highlight-card h3 {
      font-size: 1.3rem;
      font-weight: 600;
      color: var(--text-strong);
      margin-bottom: 10px;
    }
    .highlight-card p {
      font-size: 0.95rem;
      color: var(--text-body);
    }
    @media (max-width: 768px) {
      .highlights-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 案例瀑布流 */
    .cases {
      padding: 80px 0;
    }
    .cases-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .case-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      overflow: hidden;
      transition: var(--transition-default);
    }
    .case-card:nth-child(odd) {
      transform: translateY(0);
    }
    .case-card:nth-child(even) {
      transform: translateY(20px);
    }
    .case-card:hover {
      border-color: var(--glass-hover-border);
      box-shadow: 0 8px 28px rgba(0,240,255,0.1);
    }
    .case-img {
      width: 100%;
      height: 220px;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .case-card:hover .case-img {
      transform: scale(1.03);
      filter: brightness(1.1);
    }
    .case-content {
      padding: 20px;
    }
    .case-title {
      font-weight: 600;
      font-size: 1.2rem;
      color: var(--text-strong);
      margin-bottom: 6px;
    }
    .case-desc {
      font-size: 0.9rem;
      color: var(--text-body);
      margin-bottom: 12px;
    }
    .badge-gold {
      background: rgba(255,184,0,0.15);
      color: var(--gold);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
      display: inline-block;
    }
    @media (max-width: 768px) {
      .cases-grid {
        grid-template-columns: 1fr;
      }
      .case-card:nth-child(even) {
        transform: translateY(0);
      }
    }
    /* 方案对比 */
    .compare {
      padding: 80px 0;
    }
    .compare-table {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .plan-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 36px 24px;
      text-align: center;
      transition: var(--transition-default);
    }
    .plan-card.featured {
      border-color: var(--gold);
      background: rgba(255,255,255,0.06);
      transform: scale(1.03);
      box-shadow: 0 0 30px rgba(255,184,0,0.15);
    }
    .plan-badge {
      background: var(--gold);
      color: #0A0E27;
      font-weight: 700;
      padding: 4px 16px;
      border-radius: 20px;
      font-size: 0.8rem;
      display: inline-block;
      margin-bottom: 16px;
    }
    .plan-name {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--text-strong);
    }
    .plan-price {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--gold);
      margin: 12px 0;
    }
    .plan-features {
      list-style: none;
      text-align: left;
      margin: 24px 0;
    }
    .plan-features li {
      padding: 8px 0;
      color: var(--text-body);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .plan-features li::before {
      content: "✓";
      color: var(--accent);
      font-weight: bold;
    }
    @media (max-width: 768px) {
      .compare-table {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
      }
      .plan-card.featured {
        transform: scale(1);
      }
    }
    /* 数据带 */
    .trust {
      padding: 70px 0;
      background: rgba(0,0,0,0.3);
    }
    .trust-stats {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 32px;
      text-align: center;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--accent);
      letter-spacing: -0.02em;
    }
    .stat-label {
      color: var(--text-weak);
      margin-top: 8px;
    }
    /* FAQ */
    .faq {
      padding: 80px 0;
    }
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--glass-border);
      padding: 20px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      color: var(--text-strong);
      cursor: pointer;
      font-size: 1.1rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-body);
      padding-top: 0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    /* CTA 横幅 */
    .cta-banner {
      background: radial-gradient(circle at center, rgba(0,240,255,0.2) 0%, var(--primary) 70%);
      padding: 80px 24px;
      text-align: center;
    }
    .cta-title {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--text-strong);
      margin-bottom: 32px;
    }
    /* 页脚 */
    .footer {
      background: #060A1A;
      padding: 60px 0 30px;
      font-size: 0.85rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    .footer-col h4 {
      color: var(--text-strong);
      margin-bottom: 16px;
      font-weight: 600;
    }
    .footer-col a, .footer-col p {
      color: var(--text-weak);
      display: block;
      margin-bottom: 8px;
    }
    .footer-col a:hover {
      color: var(--accent);
    }
    .copyright {
      margin-top: 40px;
      text-align: center;
      color: var(--text-weak);
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 20px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }