/* roulang page: index */
:root {
      --primary: #0A7E5F;
      --primary-dark: #06694B;
      --accent: #C8963E;
      --accent-light: #D4A84B;
      --bg: #FAF9F7;
      --surface: #FFFFFF;
      --dark-bg: #0C2B22;
      --footer-bg: #1A1A1A;
      --text-main: #1A1A1A;
      --text-body: #4A4A4A;
      --text-muted: #8A8A8A;
      --text-on-dark: #FFFFFF;
      --text-on-dark-muted: #D4D4D4;
      --border-light: #E8E6E1;
      --success: #2D9C6B;
      --warning: #E67E22;
      --error: #C0392B;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-btn: 10px;
      --shadow-card: 0 8px 30px rgba(0, 0, 0, 0.06);
      --shadow-card-hover: 0 12px 40px rgba(0, 0, 0, 0.10);
      --shadow-nav: 0 2px 20px rgba(0, 0, 0, 0.04);
      --shadow-btn-glow: 0 4px 14px rgba(10, 126, 95, 0.3);
      --transition: 0.25s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, sans-serif;
      --font-number: "Inter", "SF Pro Text", "Segoe UI", system-ui, sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-body);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--surface);
      z-index: 1000;
      height: 72px;
      border-bottom: 1px solid transparent;
      transition: box-shadow var(--transition), border-color var(--transition);
      display: flex;
      align-items: center;
    }
    .site-header.scrolled {
      box-shadow: var(--shadow-nav);
      border-bottom-color: var(--border-light);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 0.5px;
      white-space: nowrap;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 36px;
    }
    .nav-link {
      font-size: 15px;
      color: var(--text-body);
      font-weight: 500;
      letter-spacing: 0.4px;
      position: relative;
      padding: 4px 0;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 12px 26px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
      border: 1.5px solid transparent;
      white-space: nowrap;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: var(--shadow-btn-glow);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 12px 26px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all var(--transition);
    }
    .btn-outline:hover {
      background: rgba(10, 126, 95, 0.08);
      transform: translateY(-2px);
    }
    .btn-accent {
      background: var(--accent);
      color: white;
      padding: 14px 34px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 16px;
      transition: background var(--transition), transform var(--transition);
      border: none;
    }
    .btn-accent:hover {
      background: var(--accent-light);
      transform: scale(1.03);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      padding: 8px;
      background: transparent;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-main);
      transition: var(--transition);
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      height: calc(100vh - 72px);
      background: var(--surface);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      z-index: 999;
      transform: translateX(100%);
      transition: transform 0.35s ease;
    }
    .mobile-menu.active {
      transform: translateX(0);
    }
    .mobile-menu .nav-link {
      font-size: 22px;
      font-weight: 600;
    }
    /* Hero */
    .hero {
      padding: 140px 0 100px;
      background: var(--bg);
      display: flex;
      align-items: center;
      min-height: 90vh;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-text {
      flex: 1 1 50%;
    }
    .hero-title {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-body);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      align-items: center;
      margin-bottom: 28px;
    }
    .trust-badges {
      display: flex;
      align-items: center;
      gap: 20px;
      color: var(--text-muted);
      font-size: 14px;
    }
    .badge-icon {
      display: flex;
      align-items: center;
      gap: 4px;
    }
    .hero-image {
      flex: 1 1 45%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 32px;
      min-height: 380px;
      box-shadow: var(--shadow-card);
    }
    /* 通用板块 */
    .section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
      letter-spacing: -0.3px;
    }
    .section-desc {
      color: var(--text-muted);
      margin-bottom: 48px;
      font-size: 17px;
    }
    /* 优势非对称 */
    .advantages-grid {
      display: flex;
      gap: 24px;
      align-items: stretch;
    }
    .adv-main {
      flex: 1 1 55%;
      background: var(--surface);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .adv-side {
      flex: 1 1 45%;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .adv-card {
      background: var(--surface);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .adv-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .icon-circle {
      width: 48px;
      height: 48px;
      background: rgba(10,126,95,0.08);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
      color: var(--primary);
    }
    /* 服务卡片4列 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--surface);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      text-align: left;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card-hover);
    }
    .service-icon {
      width: 64px;
      height: 64px;
      background: rgba(10,126,95,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--primary);
    }
    /* 流程 */
    .steps-row {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      gap: 20px;
    }
    .step-item {
      flex: 1;
      text-align: center;
      position: relative;
    }
    .step-circle {
      width: 56px;
      height: 56px;
      background: var(--primary);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 22px;
      margin: 0 auto 16px;
    }
    /* 数据 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      text-align: center;
    }
    .stat-number {
      font-size: 42px;
      font-weight: 700;
      color: var(--primary);
      font-family: var(--font-number);
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--surface);
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      transition: background var(--transition);
      background: transparent;
      width: 100%;
      font-size: 16px;
      color: var(--text-main);
    }
    .faq-question:hover {
      background: #F5F5F5;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding: 0 24px;
      color: var(--text-body);
      font-size: 15px;
      line-height: 1.7;
      border-top: 1px solid transparent;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px 24px;
      border-top-color: var(--border-light);
    }
    .faq-icon {
      font-size: 22px;
      transition: transform 0.3s ease;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    /* CTA深色 */
    .cta-dark {
      background: var(--dark-bg);
      padding: 100px 0;
      text-align: center;
      color: white;
    }
    /* 页脚 */
    .site-footer {
      background: var(--footer-bg);
      color: #B0B0B0;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 1024px) {
      .hero-title { font-size: 40px; }
      .services-grid { grid-template-columns: repeat(2,1fr); }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .mobile-menu { display: flex; }
      .hero-grid { flex-direction: column; }
      .hero-image { min-height: 260px; width: 100%; }
      .advantages-grid { flex-direction: column; }
      .services-grid { grid-template-columns: 1fr; }
      .steps-row { flex-direction: column; align-items: flex-start; }
      .section-title { font-size: 28px; }
      .hero-title { font-size: 32px; }
      .footer-grid { grid-template-columns: 1fr; }
    }