/* roulang page: index */
:root {
      --bg-deep: #0B0E17;
      --surface-glass: rgba(20, 30, 50, 0.75);
      --border-glow: rgba(0, 229, 255, 0.15);
      --primary-ice: #00E5FF;
      --accent-green: #4ADE80;
      --text-white: #FFFFFF;
      --text-lightblue: #B0C7E0;
      --text-body: #8A9BB5;
      --text-muted: #5A6A82;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-btn: 50px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-glow: 0 0 20px rgba(0, 229, 255, 0.6);
      --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Inter", system-ui, sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      background-image: 
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
      background-size: 60px 60px;
      background-attachment: fixed;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

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

    button, input, textarea {
      font-family: inherit;
    }

    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(11, 14, 23, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0, 229, 255, 0.1);
      z-index: 100;
      padding: 0 24px;
      height: 72px;
      display: flex;
      align-items: center;
    }

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

    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--text-white);
      display: flex;
      align-items: center;
      gap: 6px;
      letter-spacing: -0.3px;
    }
    .logo span {
      color: var(--primary-ice);
    }

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

    .nav-links a {
      color: var(--text-lightblue);
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding-bottom: 4px;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-ice);
      transition: width 0.25s ease;
    }
    .nav-links a:hover {
      color: var(--primary-ice);
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-capsule {
      background: var(--primary-ice);
      color: var(--bg-deep);
      font-weight: 700;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      box-shadow: var(--shadow-glow);
      transition: all 0.25s ease;
      font-size: 14px;
      letter-spacing: 0.3px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-capsule:hover {
      box-shadow: 0 0 30px rgba(0, 229, 255, 0.8);
      filter: brightness(1.1);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 8px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary-ice);
      border-radius: 2px;
      transition: 0.2s;
    }

    /* 区块间距 */
    section {
      padding: 100px 0;
    }

    /* Hero */
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      min-height: 90vh;
      padding-top: 96px;
    }
    .hero-content h1 {
      font-size: 48px;
      font-weight: 800;
      color: var(--text-white);
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero-content .subtitle {
      font-size: 18px;
      color: var(--text-lightblue);
      margin-bottom: 32px;
      font-weight: 400;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-outline {
      border: 2px solid var(--primary-ice);
      color: var(--primary-ice);
      background: transparent;
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      cursor: pointer;
      transition: 0.25s;
    }
    .btn-outline:hover {
      background: rgba(0, 229, 255, 0.1);
    }
    .hero-image {
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
      background: radial-gradient(circle at center, rgba(0, 229, 255, 0.15) 0%, transparent 70%);
      border-radius: 24px;
    }
    .hero-image img {
      border-radius: 20px;
      width: 100%;
      height: auto;
      backdrop-filter: blur(2px);
    }

    /* 卡片通用 */
    .glass-card {
      background: var(--surface-glass);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      transition: box-shadow 0.3s ease, transform 0.2s;
    }
    .glass-card:hover {
      box-shadow: 0 12px 40px rgba(0, 229, 255, 0.25);
    }

    /* 亮点网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-large {
      grid-row: span 2;
      display: flex;
      flex-direction: column;
      justify-content: center;
      padding: 40px 32px;
    }
    .feature-item {
      padding: 32px;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .feature-icon {
      font-size: 36px;
      color: var(--primary-ice);
    }
    .feature-title {
      font-size: 22px;
      font-weight: 700;
      color: var(--text-white);
    }
    .feature-desc {
      color: var(--text-body);
      font-size: 15px;
    }

    /* 案例瀑布 */
    .cases-waterfall {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      position: relative;
      border-radius: 16px;
      overflow: hidden;
      background: #0B0E17;
      transition: all 0.3s;
    }
    .case-card img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
    }
    .case-info {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      padding: 24px 20px;
      background: linear-gradient(transparent, rgba(11,14,23,0.95));
    }
    .case-title {
      color: white;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .case-tag {
      background: rgba(74, 222, 128, 0.2);
      color: var(--accent-green);
      padding: 2px 10px;
      border-radius: 20px;
      font-size: 12px;
      display: inline-block;
    }
    .case-hover-detail {
      color: var(--primary-ice);
      font-size: 14px;
      margin-top: 6px;
      opacity: 0;
      transition: 0.3s;
    }
    .case-card:hover .case-hover-detail {
      opacity: 1;
    }
    .case-card:hover .case-info {
      background: rgba(0,0,0,0.8);
    }

    /* 对比表 */
    .table-wrapper {
      overflow-x: auto;
      border-radius: 16px;
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      min-width: 700px;
    }
    .compare-table th {
      background: rgba(20,30,50,0.9);
      color: white;
      padding: 20px 16px;
      font-weight: 600;
    }
    .compare-table td {
      background: var(--surface-glass);
      padding: 18px 16px;
      color: var(--text-body);
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    .highlight-col {
      border-left: 2px solid var(--primary-ice);
      position: relative;
    }
    .badge-recommend {
      background: var(--accent-green);
      color: #0B0E17;
      font-size: 12px;
      font-weight: 700;
      padding: 2px 8px;
      border-radius: 4px;
      position: absolute;
      top: 12px;
      right: 12px;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.05);
      padding: 16px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 700;
      color: white;
      cursor: pointer;
      padding: 8px 0;
    }
    .faq-answer {
      color: var(--text-body);
      padding: 8px 0 16px;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .arrow {
      color: var(--primary-ice);
    }

    /* 联系表单 */
    .contact-form {
      display: flex;
      flex-direction: column;
      gap: 16px;
      max-width: 560px;
      margin: 24px auto 0;
    }
    .contact-form input, .contact-form textarea {
      background: rgba(20,30,50,0.6);
      border: 1px solid rgba(0,229,255,0.2);
      border-radius: 8px;
      padding: 14px;
      color: white;
      outline: none;
    }
    .contact-form input:focus {
      border-color: var(--primary-ice);
    }
    .btn-submit {
      background: var(--accent-green);
      color: #0B0E17;
      font-weight: 700;
      padding: 14px;
      border: none;
      border-radius: 12px;
      cursor: pointer;
      font-size: 16px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
      margin-top: 40px;
    }
    .copyright {
      text-align: center;
      color: var(--text-muted);
      margin-top: 48px;
      font-size: 14px;
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-grid { grid-template-columns: 1fr; text-align: center; }
      .hero-buttons { justify-content: center; }
      .features-grid { grid-template-columns: 1fr; }
      .cases-waterfall { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      h1 { font-size: 32px !important; }
    }
    @media (max-width: 480px) {
      .btn-capsule, .btn-outline { width: 100%; }
    }