/* roulang page: index */
:root {
      --primary: #0B2B26;
      --gold: #D4AF37;
      --gold-dark: #C89B3C;
      --bg-warm: #F4F4F2;
      --accent: #E94F37;
      --text-dark: #1C1C1C;
      --text-muted: #4A4A4A;
      --white: #FFFFFF;
      --card-bg: #FFFFFF;
      --border-light: #E5E5E0;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --font-number: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
      --max-width: 1280px;
      --nav-height: 72px;
      --space-section: 100px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.2s ease;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      z-index: 1000;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.3px;
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--gold);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor"><path d="M12 2L15.09 8.26L22 9.27L17 14.14L18.18 21.02L12 17.77L5.82 21.02L7 14.14L2 9.27L8.91 8.26L12 2Z"/></svg>') center/cover;
      background-color: var(--gold);
    }

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

    .nav-link {
      font-size: 16px;
      font-weight: 500;
      color: var(--text-muted);
      padding: 8px 0;
      position: relative;
      transition: color 0.2s;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--gold);
      transition: width 0.2s ease;
    }

    .nav-link:hover,
    .nav-link.active {
      color: var(--primary);
    }

    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      width: 24px;
      height: 24px;
      justify-content: center;
      background: transparent;
    }

    .hamburger span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--primary);
      transition: 0.2s;
    }

    /* 移动端菜单 */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(12px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      transform: translateX(100%);
      transition: transform 0.3s ease;
      z-index: 999;
    }

    .mobile-menu.open {
      transform: translateX(0);
    }

    .mobile-menu .nav-link {
      font-size: 22px;
    }

    @media (max-width: 768px) {
      .nav-menu {
        display: none;
      }
      .hamburger {
        display: flex;
      }
    }

    /* Hero */
    .hero {
      padding-top: calc(var(--nav-height) + 60px);
      padding-bottom: 80px;
      background: linear-gradient(135deg, var(--primary) 55%, var(--bg-warm) 55%);
      display: flex;
      align-items: center;
      min-height: 90vh;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-content {
      color: var(--white);
    }

    .hero h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 700;
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }

    .hero-sub {
      font-size: 18px;
      line-height: 1.6;
      color: rgba(255,255,255,0.85);
      margin-bottom: 32px;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--gold), var(--gold-dark));
      color: white;
      padding: 16px 48px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 18px;
      box-shadow: 0 4px 12px rgba(212,175,55,0.4);
      transition: all 0.25s;
    }

    .btn-primary:hover {
      box-shadow: 0 0 0 4px rgba(212,175,55,0.3), 0 8px 18px rgba(0,0,0,0.12);
      transform: translateY(-2px);
    }

    .hero-image {
      background: #E5E5E0;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 20px 35px rgba(0,0,0,0.15);
    }

    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .hero h1 {
        font-size: 38px;
      }
      .hero {
        background: var(--primary);
      }
    }

    @media (max-width: 768px) {
      .hero h1 {
        font-size: 32px;
      }
      .hero-sub {
        font-size: 16px;
      }
      .btn-primary {
        width: 100%;
        padding: 14px 24px;
      }
    }

    /* 通用板块 */
    .section {
      padding: var(--space-section) 0;
    }

    .section-title {
      font-size: 36px;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 16px;
      letter-spacing: -0.3px;
    }

    .section-desc {
      color: var(--text-muted);
      max-width: 720px;
      margin-bottom: 48px;
      font-size: 16px;
      line-height: 1.7;
    }

    /* 解决方案 */
    .solution-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.9fr 1.1fr;
      gap: 28px;
    }

    .solution-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px 28px;
      box-shadow: var(--shadow-sm);
      border-left: 4px solid var(--gold);
      transition: all 0.25s;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .solution-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    .solution-icon {
      width: 64px;
      height: 64px;
      background: #EDF1F0;
      border-radius: 16px;
      overflow: hidden;
    }

    .solution-icon img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .solution-card h3 {
      font-size: 22px;
      font-weight: 600;
      color: var(--primary);
    }

    @media (max-width: 1024px) {
      .solution-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .solution-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 优势 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .advantage-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: 0.2s;
      display: flex;
      flex-direction: column;
      gap: 16px;
      align-items: flex-start;
      height: fit-content;
    }

    .advantage-card:nth-child(2) {
      margin-top: 20px;
    }

    .advantage-card:nth-child(3) {
      margin-top: -10px;
    }

    .advantage-icon {
      font-size: 36px;
      color: var(--gold);
    }

    .advantage-card h3 {
      font-size: 20px;
      font-weight: 600;
    }

    @media (max-width: 1024px) {
      .advantages-grid {
        grid-template-columns: 1fr 1fr;
      }
      .advantage-card:nth-child(2),
      .advantage-card:nth-child(3) {
        margin-top: 0;
      }
    }

    @media (max-width: 768px) {
      .advantages-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 数据成果 */
    .stats-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 40px;
      justify-content: center;
    }

    .stat-item {
      text-align: center;
    }

    .stat-number {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 700;
      color: var(--primary);
    }

    .stat-label {
      color: var(--text-muted);
      margin-top: 8px;
    }

    /* 证言 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      align-items: start;
    }

    .testimonial-card {
      background: var(--white);
      padding: 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      position: relative;
    }

    .testimonial-card::before {
      content: "“";
      font-size: 64px;
      color: var(--gold);
      opacity: 0.2;
      position: absolute;
      top: 10px;
      left: 20px;
      font-family: serif;
    }

    .testimonial-text {
      font-style: italic;
      margin-bottom: 24px;
      color: var(--text-dark);
      padding-top: 20px;
    }

    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .avatar {
      width: 48px;
      height: 48px;
      background: #E5E5E0;
      border-radius: 50%;
    }

    @media (max-width: 768px) {
      .testimonials-grid {
        grid-template-columns: 1fr;
      }
    }

    /* FAQ */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-item {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 20px 24px;
      cursor: pointer;
      transition: background 0.2s;
      border-left: 4px solid transparent;
    }

    .faq-item.active {
      background: #F9F9F7;
      border-left-color: var(--gold);
    }

    .faq-question {
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-answer {
      margin-top: 12px;
      color: var(--text-muted);
      display: none;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA */
    .cta-section {
      background: var(--primary);
      color: white;
      text-align: center;
      padding: 100px 24px;
      border-radius: 0;
    }

    .cta-section h2 {
      font-size: 40px;
      margin-bottom: 20px;
    }

    /* 页脚 */
    .footer {
      background: var(--primary);
      color: #F4F4F2;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
    }

    .footer a {
      color: #ccc;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .section-title {
        font-size: 28px;
      }
    }