/* roulang page: index */
:root {
      --primary: #E33B1E;
      --primary-dark: #C42D14;
      --secondary: #0F1A2C;
      --accent: #F59E0B;
      --bg: #F9FAFB;
      --card: #FFFFFF;
      --text: #1F2937;
      --text-muted: #6B7280;
      --border: #E5E7EB;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --shadow-card: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 24px rgba(0,0,0,0.1);
      --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-mono: "Inter", "Roboto", sans-serif;
      --max-width: 1280px;
      --section-gap: 120px;
      --inner-gap: 60px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.8;
      font-weight: 400;
      font-size: 1rem;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3 {
      font-weight: 700;
    }
    h1 {
      font-weight: 800;
      font-size: clamp(2.5rem, 6vw, 4rem);
      letter-spacing: -0.02em;
      line-height: 1.2;
    }
    h2 {
      font-size: clamp(2rem, 4vw, 2.8rem);
      margin-bottom: 1rem;
    }
    h3 {
      font-weight: 600;
      font-size: 1.25rem;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.2s ease;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      font-weight: 600;
      transition: all 0.2s ease;
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-size: 1rem;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      box-shadow: 0 4px 10px rgba(227,59,30,0.3);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-1px);
      box-shadow: 0 8px 18px rgba(227,59,30,0.4);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background: rgba(227,59,30,0.08);
      border-color: var(--primary-dark);
      color: var(--primary-dark);
    }
    .btn-light {
      background: white;
      color: var(--secondary);
      font-weight: 600;
    }
    .btn-light:hover {
      background: #f0f0f0;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent;
      transition: all 0.3s ease;
      padding: 16px 0;
    }
    .navbar.scrolled {
      background: rgba(255,255,255,0.98);
      box-shadow: 0 2px 12px rgba(0,0,0,0.06);
      border-bottom: 1px solid var(--border);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 800;
      font-size: 1.5rem;
      color: var(--secondary);
      letter-spacing: -0.5px;
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--primary);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 20px;
      position: relative;
      overflow: hidden;
    }
    .logo-icon::after {
      content: "";
      position: absolute;
      width: 16px;
      height: 16px;
      background: rgba(255,255,255,0.3);
      border-radius: 50%;
      top: -4px;
      right: -4px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text);
      font-size: 0.95rem;
      position: relative;
      padding: 4px 0;
    }
    .nav-links a::after {
      content: "";
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .nav-cta {
      margin-left: 16px;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
      padding: 8px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--secondary);
      transition: 0.3s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: var(--secondary);
      z-index: 999;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 40px;
    }
    .mobile-menu a {
      color: white;
      font-size: 1.8rem;
      font-weight: 600;
    }
    .mobile-menu .btn-primary {
      background: white;
      color: var(--secondary);
    }
    /* Hero */
    .hero {
      padding: 160px 0 100px;
      background: var(--bg);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero-left h1 {
      margin-bottom: 24px;
      color: var(--secondary);
    }
    .hero-left .subtitle {
      font-size: 1.25rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      max-width: 90%;
    }
    .hero-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }
    .hero-right {
      position: relative;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: var(--shadow-hover);
    }
    .hero-right img {
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/3;
    }
    .live-badge {
      position: absolute;
      top: 20px;
      left: 20px;
      background: var(--secondary);
      color: white;
      padding: 6px 16px;
      border-radius: 20px;
      font-weight: 600;
      font-size: 0.8rem;
      display: flex;
      align-items: center;
      gap: 6px;
      backdrop-filter: blur(4px);
      background: rgba(15,26,44,0.8);
    }
    .live-dot {
      width: 10px;
      height: 10px;
      background: var(--accent);
      border-radius: 50%;
      animation: pulse 1.5s infinite;
    }
    @keyframes pulse {
      0% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.6; transform: scale(1.2); }
      100% { opacity: 1; transform: scale(1); }
    }
    /* 亮点网格 */
    .highlights {
      padding: var(--section-gap) 0;
    }
    .highlights h2 {
      text-align: center;
      margin-bottom: 48px;
    }
    .grid-masonry {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px;
    }
    .highlight-card {
      background: var(--card);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
      gap: 20px;
      border: 1px solid var(--border);
    }
    .highlight-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .highlight-card.tall {
      grid-row: span 2;
    }
    .icon-circle {
      width: 52px;
      height: 52px;
      background: rgba(227,59,30,0.08);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 26px;
    }
    .highlight-card h3 {
      font-size: 1.4rem;
    }
    .highlight-card p {
      color: var(--text-muted);
      line-height: 1.7;
    }
    /* 案例瀑布流 */
    .cases {
      padding: var(--section-gap) 0;
    }
    .cases h2 {
      text-align: center;
      margin-bottom: 48px;
    }
    .waterfall {
      columns: 3 320px;
      column-gap: 24px;
    }
    .case-card {
      break-inside: avoid;
      margin-bottom: 24px;
      background: var(--card);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      border: 1px solid var(--border);
    }
    .case-card:hover {
      transform: translateY(-8px);
      box-shadow: 0 20px 30px rgba(0,0,0,0.12);
    }
    .case-img {
      position: relative;
      height: 200px;
      background: #ddd;
    }
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .case-tag {
      position: absolute;
      bottom: 12px;
      left: 12px;
      background: rgba(15,26,44,0.8);
      color: white;
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 0.75rem;
      backdrop-filter: blur(4px);
    }
    .case-content {
      padding: 20px;
    }
    .case-content h3 {
      margin-bottom: 8px;
    }
    .case-stat {
      font-family: var(--font-mono);
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--accent);
    }
    /* 方案对比 */
    .compare {
      padding: var(--section-gap) 0;
    }
    .compare h2 {
      text-align: center;
      margin-bottom: 48px;
    }
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .compare-col {
      background: var(--card);
      border-radius: var(--radius-card);
      padding: 36px;
      box-shadow: var(--shadow-card);
    }
    .compare-col.old {
      background: #f3f4f6;
    }
    .compare-col.new {
      background: rgba(227,59,30,0.03);
      border: 1px solid rgba(227,59,30,0.15);
    }
    .compare-col h3 {
      margin-bottom: 28px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .compare-list {
      list-style: none;
    }
    .compare-list li {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 18px;
      font-size: 1rem;
    }
    .check {
      color: #10B981;
      font-weight: bold;
    }
    .cross {
      color: #9CA3AF;
    }
    /* FAQ */
    .faq {
      padding: var(--section-gap) 0;
    }
    .faq h2 {
      text-align: center;
      margin-bottom: 48px;
    }
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      background: var(--card);
      border-radius: 0;
      border-left: 4px solid var(--primary);
      margin-bottom: 16px;
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: white;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      background: #f9fafb;
      padding: 0 24px;
    }
    .faq-answer p {
      padding: 16px 0;
      color: var(--text-muted);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
    }
    .arrow {
      transition: transform 0.3s;
    }
    .faq-item.active .arrow {
      transform: rotate(180deg);
    }
    /* CTA */
    .cta-section {
      background: var(--secondary);
      padding: 100px 0;
      text-align: center;
      color: white;
    }
    .cta-section h2 {
      color: white;
      margin-bottom: 16px;
    }
    .cta-section p {
      color: #cbd5e1;
      margin-bottom: 36px;
      font-size: 1.2rem;
    }
    .btn-glow {
      box-shadow: 0 0 20px rgba(227,59,30,0.6);
    }
    /* Footer */
    .footer {
      background: #0a121f;
      color: #cbd5e1;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 48px;
      margin-bottom: 48px;
    }
    .footer-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 800;
      font-size: 1.25rem;
      color: white;
      margin-bottom: 16px;
    }
    .footer h4 {
      color: white;
      margin-bottom: 20px;
    }
    .footer a {
      color: #cbd5e1;
      display: block;
      margin-bottom: 12px;
    }
    .footer a:hover {
      color: white;
    }
    .social-icons {
      display: flex;
      gap: 16px;
      margin-top: 12px;
    }
    .social-icons span {
      width: 36px;
      height: 36px;
      background: #1f2a3a;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .copyright {
      border-top: 1px solid #2d3748;
      padding-top: 24px;
      text-align: center;
      font-size: 0.9rem;
    }
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .compare-grid, .faq-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .nav-links, .nav-cta {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .waterfall {
        columns: 2 280px;
      }
      .grid-masonry {
        grid-template-columns: 1fr;
      }
      .highlight-card.tall {
        grid-row: span 1;
      }
    }
    @media (max-width: 520px) {
      .waterfall {
        columns: 1;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }