/* roulang page: index */
:root {
      --primary: #1A3B32;
      --primary-light: rgba(26, 59, 50, 0.08);
      --secondary: #2E7D32;
      --accent: #FF6F00;
      --accent-dark: #E65C00;
      --bg: #FAFAF9;
      --card: #FFFFFF;
      --text: #1F2329;
      --text-light: #6B7280;
      --border-light: #E5E7EB;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.03), 0 1px 3px rgba(0,0,0,0.02);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.06), 0 2px 6px rgba(0,0,0,0.04);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-full: 50px;
      --transition: all 0.25s cubic-bezier(0.25, 0.8, 0.25, 1.2);
      --font-cn: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, sans-serif;
      --font-en: "Inter", "SF Pro Display", system-ui, sans-serif;
      --max-width: 1280px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-cn);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }

    /* 导航 */
    .nav-bar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(250, 250, 249, 0.85);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(229, 231, 235, 0.6);
      transition: var(--transition);
    }
    .nav-bar.scrolled {
      background: rgba(255, 255, 255, 0.98);
      box-shadow: var(--shadow-sm);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .logo svg {
      width: 32px;
      height: 32px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-light);
      position: relative;
      padding: 6px 0;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary);
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-full);
      font-size: 0.95rem;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(255, 111, 0, 0.2);
      letter-spacing: 0.3px;
    }
    .btn-primary:hover {
      background: var(--accent-dark);
      box-shadow: 0 8px 20px rgba(255, 111, 0, 0.35);
      transform: translateY(-1px);
    }
    .btn-outline {
      border: 1.5px solid white;
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-full);
      font-weight: 600;
      background: transparent;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.15);
      border-color: rgba(255,255,255,0.9);
    }
    .mobile-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
      padding: 8px;
    }
    .mobile-toggle span {
      width: 24px;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
      transition: var(--transition);
    }
    @media (max-width: 1024px) {
      .nav-menu {
        gap: 20px;
      }
    }
    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        align-items: flex-start;
        padding: 24px;
        gap: 18px;
        box-shadow: var(--shadow-hover);
        transform: translateY(-120%);
        opacity: 0;
        transition: var(--transition);
        pointer-events: none;
        border-bottom: 1px solid var(--border-light);
      }
      .nav-menu.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
      }
      .mobile-toggle {
        display: flex;
      }
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, rgba(26,59,50,0.75) 0%, rgba(26,59,50,0.4) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 90vh;
      display: flex;
      align-items: center;
      color: white;
      margin-top: 72px;
      position: relative;
    }
    .hero-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 48px;
      width: 100%;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-text p {
      font-size: 1.2rem;
      opacity: 0.9;
      margin-bottom: 36px;
      max-width: 550px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-image {
      flex: 0.9;
      display: flex;
      justify-content: flex-end;
    }
    .hero-image img {
      max-height: 420px;
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.25);
    }
    @media (max-width: 1024px) {
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero-text h1 {
        font-size: 2.4rem;
      }
      .hero-image {
        justify-content: center;
      }
    }

    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
    }

    .section-title {
      font-size: 2rem;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 16px;
      letter-spacing: -0.3px;
    }
    .section-sub {
      color: var(--text-light);
      font-size: 1.1rem;
      margin-bottom: 48px;
    }

    /* 核心优势网格 2x3 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .advantage-card {
      background: var(--card);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .advantage-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .adv-icon {
      width: 56px;
      height: 56px;
      background: #E8F5E9;
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 24px;
      color: var(--primary);
      transition: var(--transition);
    }
    .advantage-card:hover .adv-icon {
      background: var(--secondary);
      color: white;
    }
    .adv-title {
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 12px;
    }

    /* 服务矩阵 1+2 */
    .service-matrix {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .service-large {
      grid-row: span 2;
      background: var(--card);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .service-large:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
    }
    .service-img {
      height: 240px;
      background: url('/assets/images/coverpic/cover-1.webp') center/cover no-repeat;
    }
    .service-info {
      padding: 28px;
    }
    .service-small {
      background: var(--card);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      display: flex;
      gap: 20px;
      align-items: center;
      transition: var(--transition);
    }
    .service-small:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-2px);
    }
    .service-small-img {
      width: 80px;
      height: 80px;
      border-radius: 12px;
      background-size: cover;
      background-position: center;
    }
    @media (max-width: 768px) {
      .service-matrix {
        grid-template-columns: 1fr;
      }
      .service-large {
        grid-row: auto;
      }
    }

    /* 数据模块 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary);
      font-family: var(--font-en);
    }
    .stat-label {
      color: var(--text-light);
      margin-top: 8px;
    }

    /* FAQ */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      background: var(--card);
      border-radius: var(--radius-card);
      padding: 8px 0;
      box-shadow: var(--shadow-sm);
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 24px 32px;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 1.1rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--text-light);
      margin-top: 0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 16px;
    }

    /* CTA Banner */
    .cta-banner {
      background: var(--primary);
      text-align: center;
      padding: 80px 0;
      color: white;
    }

    /* Footer */
    .footer {
      background: #0F2420;
      color: #B0BEC5;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer a:hover {
      color: white;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }