/* roulang page: index */
:root {
      --brand-deep: #1A2B4C;
      --brand-green: #00B578;
      --brand-orange: #FF6B35;
      --alert-red: #FA5151;
      --bg-light: #F5F6FA;
      --card-white: #FFFFFF;
      --text-primary: #1F2329;
      --text-secondary: #86909C;
      --text-on-dark: #FFFFFF;
      --border-light: rgba(26, 43, 76, 0.08);
      --shadow-card: 0 2px 12px rgba(26, 43, 76, 0.06);
      --shadow-card-hover: 0 8px 24px rgba(26, 43, 76, 0.10);
      --shadow-cta: 0 4px 14px rgba(255, 107, 53, 0.30);
      --radius-card: 16px;
      --radius-button: 12px;
      --radius-tag: 6px;
      --radius-input: 8px;
      --spacing-page: 24px;
      --spacing-section: 80px;
      --transition-base: 200ms ease-out;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Inter", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-primary);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 var(--spacing-page);
    }

    h1, h2, h3 {
      line-height: 1.3;
      font-weight: 600;
      color: var(--text-primary);
    }

    h1 {
      font-size: 36px;
      font-weight: 700;
    }
    h2 {
      font-size: 28px;
    }
    h3 {
      font-size: 22px;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-base);
    }

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      transition: var(--transition-base);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    /* 导航系统 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(26, 43, 76, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent;
      transition: background var(--transition-base), border-color var(--transition-base);
    }
    .site-header.scrolled {
      background: #1A2B4C;
      border-bottom: 1px solid rgba(255,255,255,0.1);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 22px;
      font-weight: 700;
      color: white;
    }
    .logo svg {
      width: 36px;
      height: 36px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      color: white;
    }
    .nav-links a {
      font-size: 16px;
      font-weight: 500;
      color: rgba(255,255,255,0.85);
      position: relative;
    }
    .nav-links a:hover {
      color: white;
    }
    .cta-btn {
      background: var(--brand-orange);
      color: white !important;
      padding: 10px 22px;
      border-radius: 50px;
      font-weight: 600;
      box-shadow: var(--shadow-cta);
      margin-left: 12px;
    }
    .cta-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(255,107,53,0.4);
    }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 26px;
    }
    .mobile-nav {
      display: none;
    }

    /* 首屏Hero */
    .hero {
      padding: 140px 0 80px;
      background: var(--bg-light);
      background-image: radial-gradient(circle at 30% 20%, rgba(255,255,255,0.8) 0%, rgba(245,246,250,1) 70%);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
    }
    .hero-content {
      flex: 1;
    }
    .hero-tag {
      display: inline-block;
      background: #E8F0FE;
      color: var(--brand-deep);
      font-size: 14px;
      font-weight: 600;
      padding: 6px 16px;
      border-radius: var(--radius-tag);
      margin-bottom: 20px;
    }
    .hero-content h1 {
      margin-bottom: 20px;
      color: var(--brand-deep);
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      max-width: 480px;
      margin-bottom: 32px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--brand-orange);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-button);
      font-weight: 600;
      font-size: 16px;
      box-shadow: var(--shadow-cta);
    }
    .btn-primary:hover {
      transform: translateY(-4px);
      box-shadow: 0 10px 22px rgba(255,107,53,0.4);
    }
    .btn-outline {
      border: 1.5px solid var(--brand-deep);
      color: var(--brand-deep);
      padding: 14px 32px;
      border-radius: var(--radius-button);
      font-weight: 600;
      background: transparent;
    }
    .btn-outline:hover {
      background: rgba(26,43,76,0.05);
    }
    .hero-visual {
      flex: 1;
      position: relative;
    }
    .hero-dashboard {
      width: 100%;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card-hover);
      background: #1e2b42;
    }
    .glass-float {
      position: absolute;
      bottom: -20px;
      left: -20px;
      background: rgba(255,255,255,0.75);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-card);
      padding: 16px 20px;
      border: 1px solid rgba(255,255,255,0.5);
      box-shadow: 0 8px 20px rgba(0,0,0,0.06);
      font-weight: 600;
      color: var(--brand-deep);
    }

    /* 解决方案 */
    .section {
      padding: var(--spacing-section) 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-title h2 {
      margin-bottom: 10px;
    }
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      align-items: start;
    }
    .solution-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition-base);
      position: relative;
    }
    .solution-card.offset {
      transform: translateY(24px);
    }
    .solution-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .solution-card.offset:hover {
      transform: translateY(20px);
    }
    .card-icon {
      font-size: 40px;
      color: var(--brand-orange);
      margin-bottom: 20px;
    }
    .solution-card h3 {
      margin-bottom: 12px;
    }
    .solution-card p {
      color: var(--text-secondary);
      margin-bottom: 18px;
    }
    .text-link {
      color: var(--brand-orange);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    .text-link:hover {
      gap: 8px;
    }

    /* 成果展示 */
    .dark-section {
      background: var(--brand-deep);
      color: white;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      margin-bottom: 40px;
    }
    .stat-item {
      text-align: left;
    }
    .stat-number {
      font-size: 36px;
      font-weight: 700;
      color: var(--brand-orange);
      line-height: 1.2;
    }
    .stat-label {
      font-size: 14px;
      color: rgba(255,255,255,0.7);
    }
    .testimonial-glass {
      background: rgba(255,255,255,0.08);
      border: 1px solid rgba(255,255,255,0.15);
      border-radius: var(--radius-card);
      padding: 28px;
      backdrop-filter: blur(4px);
      color: white;
      font-style: italic;
    }

    /* 证言 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 28px;
    }
    .testimonial-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 32px;
      display: flex;
      gap: 24px;
      box-shadow: var(--shadow-card);
    }
    .testimonial-card.full {
      grid-column: span 2;
    }
    .client-logo {
      width: 64px;
      height: 64px;
      background: #f0f2f5;
      border-radius: 12px;
      filter: grayscale(1);
      transition: var(--transition-base);
    }
    .testimonial-card:hover .client-logo {
      filter: grayscale(0);
    }
    .quote-icon {
      color: var(--brand-orange);
      font-size: 28px;
    }

    /* CTA */
    .cta-gradient {
      background: linear-gradient(135deg, #1A2B4C 0%, #00B578 100%);
      text-align: center;
      color: white;
    }
    .cta-form {
      display: flex;
      gap: 16px;
      justify-content: center;
      margin-top: 32px;
      flex-wrap: wrap;
    }
    .cta-input {
      padding: 14px 20px;
      border-radius: var(--radius-input);
      border: none;
      width: 280px;
      font-size: 16px;
      outline: none;
      transition: box-shadow 0.2s;
    }
    .cta-input:focus {
      box-shadow: 0 0 0 3px rgba(255,107,53,0.5);
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      width: 100%;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 16px;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 16px;
    }

    /* 页脚 */
    .footer {
      background: var(--brand-deep);
      color: white;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
    }
    .copyright {
      text-align: center;
      padding-top: 30px;
      margin-top: 30px;
      border-top: 1px solid rgba(255,255,255,0.1);
      font-size: 12px;
      opacity: 0.6;
    }

    /* 移动端 */
    @media (max-width: 1024px) {
      .cards-grid { grid-template-columns: 1fr 1fr; }
      .solution-card.offset { transform: none; }
    }
    @media (max-width: 768px) {
      .desktop-nav { display: none; }
      .mobile-toggle { display: block; }
      .mobile-nav {
        display: block;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: white;
        display: flex;
        justify-content: space-around;
        padding: 12px 0;
        box-shadow: 0 -4px 12px rgba(0,0,0,0.05);
        z-index: 99;
      }
      .mobile-nav a {
        display: flex;
        flex-direction: column;
        align-items: center;
        font-size: 12px;
        color: var(--text-secondary);
      }
      .mobile-nav a.active { color: var(--brand-orange); }
      .hero-grid { flex-direction: column; }
      .stats-grid { grid-template-columns: 1fr 1fr; }
      .testimonials-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .cta-form { flex-direction: column; align-items: center; }
    }