/* roulang page: index */
:root {
      --primary: #0ABF53;
      --primary-dark: #089A45;
      --secondary: #0B0E14;
      --accent: #FF6B35;
      --accent-dark: #e55a2a;
      --bg: #F5F7FA;
      --white: #FFFFFF;
      --border: #E8ECF1;
      --text: #1E293B;
      --text-secondary: #64748B;
      --text-light: #9BA3AF;
      --footer-bg: #1A1D23;
      --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
      --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
      --shadow-lg: 0 8px 24px rgba(0,0,0,0.08);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --transition: all 0.2s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    @media (max-width: 768px) {
      .container {
        padding-left: 16px;
        padding-right: 16px;
      }
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      transition: background-color 0.3s ease, backdrop-filter 0.3s ease;
      background-color: transparent;
    }
    .navbar.scrolled {
      background-color: rgba(11, 14, 20, 0.95);
      backdrop-filter: blur(8px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.2);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: white;
      letter-spacing: 0.5px;
      text-decoration: none;
      white-space: nowrap;
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-links a {
      color: rgba(255,255,255,0.85);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      white-space: nowrap;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 1.8rem;
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
    }
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background-color: var(--secondary);
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: flex-start;
      padding: 2rem;
      gap: 2rem;
      transform: translateX(-100%);
      transition: transform 0.3s ease;
      z-index: 60;
    }
    .mobile-menu.open {
      transform: translateX(0);
    }
    .mobile-menu a {
      color: white;
      font-size: 1.5rem;
      font-weight: 500;
      text-decoration: none;
    }
    .mobile-menu .close-btn {
      position: absolute;
      top: 1.5rem;
      right: 1.5rem;
      background: none;
      border: none;
      color: white;
      font-size: 2rem;
    }
    /* Hero */
    .hero-section {
      background-color: var(--secondary);
      position: relative;
      overflow: hidden;
      min-height: 90vh;
      display: flex;
      align-items: center;
    }
    .hero-glow {
      position: absolute;
      top: -20%;
      right: -10%;
      width: 70%;
      height: 120%;
      background: radial-gradient(circle at 30% 40%, rgba(10, 191, 83, 0.25) 0%, rgba(11, 14, 20, 0) 70%);
      pointer-events: none;
    }
    .hero-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
      position: relative;
      z-index: 2;
    }
    .hero-left h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      color: white;
      margin-bottom: 1.5rem;
    }
    .hero-left .subtitle {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.7);
      margin-bottom: 2rem;
      line-height: 1.6;
    }
    .cta-group {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
      margin-bottom: 1.5rem;
    }
    .btn-primary {
      background-color: var(--primary);
      color: white;
      padding: 0.8rem 2rem;
      border-radius: var(--radius-sm);
      font-weight: 600;
      text-decoration: none;
      display: inline-block;
      transition: background-color 0.2s;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background-color: var(--primary-dark);
    }
    .btn-secondary {
      background: transparent;
      color: var(--primary);
      border: 1px solid var(--primary);
      padding: 0.8rem 2rem;
      border-radius: var(--radius-sm);
      font-weight: 600;
      text-decoration: none;
      transition: all 0.2s;
    }
    .btn-secondary:hover {
      background-color: rgba(10, 191, 83, 0.1);
    }
    .trust-badge {
      color: rgba(255,255,255,0.6);
      font-size: 0.9rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .hero-right img {
      width: 100%;
      height: auto;
      border-radius: var(--radius-lg);
      filter: drop-shadow(0 20px 30px rgba(0,0,0,0.5));
      transform: perspective(800px) rotateY(-4deg);
      transition: transform 0.3s;
    }
    @media (max-width: 768px) {
      .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-left h1 {
        font-size: 2.2rem;
      }
      .cta-group {
        justify-content: center;
      }
      .hero-right {
        order: -1;
      }
      .hero-right img {
        transform: none;
      }
    }
    /* Sections */
    .section {
      padding: 80px 0;
    }
    @media (max-width: 768px) {
      .section {
        padding: 48px 0;
      }
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 1rem;
      text-align: center;
    }
    .section-desc {
      color: var(--text-secondary);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 3rem auto;
    }
    /* 亮点网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.5rem;
    }
    .feature-card {
      background: var(--white);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 2rem;
      transition: var(--transition);
    }
    .feature-card:hover {
      box-shadow: var(--shadow-lg);
      border-color: var(--primary);
    }
    .feature-large {
      grid-row: span 2;
      background-color: #F0FAF4;
    }
    .feature-icon {
      width: 48px;
      height: 48px;
      margin-bottom: 1.2rem;
    }
    .feature-card h3 {
      font-size: 1.5rem;
      margin-bottom: 0.5rem;
    }
    @media (max-width: 768px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
      .feature-large {
        grid-row: span 1;
      }
    }
    /* 案例瀑布 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.5rem;
    }
    .case-card {
      background: var(--white);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border);
      transition: var(--transition);
    }
    .case-card:hover {
      box-shadow: var(--shadow-lg);
    }
    .case-img {
      position: relative;
      height: 200px;
      background-size: cover;
      background-position: center;
    }
    .case-img::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 60%;
      background: linear-gradient(to top, rgba(0,0,0,0.7), transparent);
    }
    .case-content {
      padding: 1.2rem;
    }
    .case-tag {
      background: #F0FAF4;
      color: var(--primary);
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
      font-size: 0.8rem;
      display: inline-block;
      margin-bottom: 0.5rem;
    }
    @media (max-width: 768px) {
      .cases-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 480px) {
      .cases-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 方案对比 */
    .compare-table {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 1rem;
      align-items: center;
    }
    .compare-col {
      background: var(--white);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 2rem;
    }
    .compare-vs {
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--accent);
    }
    .compare-row {
      display: flex;
      justify-content: space-between;
      padding: 0.8rem 0;
      border-bottom: 1px solid var(--border);
    }
    .highlight-row {
      background: #FFF4EC;
      margin: 0 -1rem;
      padding: 0.8rem 1rem;
      border-radius: 4px;
    }
    @media (max-width: 768px) {
      .compare-table {
        grid-template-columns: 1fr;
      }
      .compare-vs {
        text-align: center;
      }
    }
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1.5rem;
    }
    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 1rem 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 0.8rem;
    }
    .faq-indicator {
      width: 3px;
      height: 20px;
      background: var(--primary);
      transition: background 0.2s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
      padding-left: 1.2rem;
    }
    .faq-item.active .faq-answer {
      max-height: 100px;
      margin-top: 0.8rem;
    }
    .faq-item.active .faq-indicator {
      background: var(--accent);
    }
    @media (max-width: 768px) {
      .faq-grid {
        grid-template-columns: 1fr;
      }
    }
    /* CTA */
    .cta-banner {
      background-color: var(--secondary);
      position: relative;
      overflow: hidden;
      text-align: center;
      padding: 80px 0;
    }
    .cta-glow {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      width: 500px;
      height: 500px;
      background: radial-gradient(circle, rgba(10,191,83,0.3) 0%, transparent 70%);
    }
    .cta-banner h2 {
      color: white;
      font-size: 2.5rem;
    }
    .btn-accent {
      background: var(--accent);
      color: white;
      padding: 0.9rem 2.5rem;
      border-radius: var(--radius-sm);
      font-weight: 700;
      text-decoration: none;
      display: inline-block;
      margin-top: 2rem;
      transition: background 0.2s;
    }
    .btn-accent:hover {
      background: var(--accent-dark);
    }
    /* Footer */
    .footer {
      background: var(--footer-bg);
      color: var(--text-light);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }
    .footer a {
      color: var(--text-light);
      text-decoration: none;
    }
    .footer a:hover {
      color: var(--primary);
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }