/* roulang page: index */
:root {
      --primary-deep: #1A3C34;
      --primary-bright: #234B41;
      --accent-gold: #C9A96E;
      --accent-gold-dark: #B8944F;
      --accent-gold-hover: #A07D3A;
      --bg-warm: #F7F5F0;
      --white: #FFFFFF;
      --text-dark: #1E1E1E;
      --text-gray: #5A5A5A;
      --border-light: #E8E5DF;
      --card-shadow: 0 4px 20px rgba(0,0,0,0.04);
      --card-shadow-hover: 0 8px 30px rgba(0,0,0,0.08);
      --radius-card: 16px;
      --radius-inner: 10px;
      --radius-btn: 50px;
      --radius-faq: 8px;
      --font-zh: 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
      --font-en: 'Inter', 'SF Pro Display', sans-serif;
      --transition: all 0.3s ease;
      --nav-width: 220px;
      --content-max: 1200px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-zh);
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.6;
      font-size: 16px;
      display: flex;
      min-height: 100vh;
      flex-direction: row;
    }
    h1, h2, h3 {
      font-family: var(--font-zh);
      color: var(--primary-deep);
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-zh);
      font-weight: 600;
      transition: var(--transition);
      border: none;
      outline: none;
    }
    /* 左侧导航 (桌面端) */
    .side-nav {
      position: fixed;
      left: 0;
      top: 0;
      width: var(--nav-width);
      height: 100vh;
      background: var(--primary-deep);
      display: flex;
      flex-direction: column;
      z-index: 1000;
      box-shadow: 2px 0 15px rgba(0,0,0,0.05);
    }
    .nav-logo {
      height: 100px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-bottom: 1px solid rgba(255,255,255,0.1);
      margin-bottom: 24px;
    }
    .nav-logo span {
      font-size: 24px;
      font-weight: 700;
      color: var(--white);
      letter-spacing: 2px;
      font-family: var(--font-en);
    }
    .nav-links {
      list-style: none;
      flex: 1;
      padding: 0 12px;
    }
    .nav-links li {
      margin-bottom: 4px;
    }
    .nav-links a {
      display: flex;
      align-items: center;
      height: 48px;
      padding: 0 16px;
      color: rgba(255,255,255,0.8);
      font-size: 16px;
      font-weight: 500;
      border-radius: 8px;
      position: relative;
      transition: var(--transition);
    }
    .nav-links a::before {
      content: '';
      position: absolute;
      left: 0;
      top: 50%;
      transform: translateY(-50%);
      width: 4px;
      height: 20px;
      background: transparent;
      border-radius: 2px;
      transition: var(--transition);
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-gold);
      background: rgba(255,255,255,0.05);
    }
    .nav-links a:hover::before,
    .nav-links a.active::before {
      background: var(--accent-gold);
    }
    .nav-footer {
      padding: 24px 16px;
      border-top: 1px solid rgba(255,255,255,0.1);
    }
    .lang-switch {
      color: rgba(255,255,255,0.7);
      font-size: 14px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    /* 主内容区 */
    .main-content {
      margin-left: var(--nav-width);
      width: calc(100% - var(--nav-width));
      max-width: 100%;
    }
    .container {
      max-width: 980px;
      margin: 0 auto;
      padding: 0 24px;
    }
    section {
      padding: 100px 0;
    }
    /* 移动端顶部导航 */
    .mobile-header {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: var(--primary-deep);
      z-index: 999;
      align-items: center;
      justify-content: space-between;
      padding: 0 20px;
    }
    .mobile-logo {
      font-size: 20px;
      font-weight: 700;
      color: white;
      font-family: var(--font-en);
    }
    .hamburger {
      background: none;
      border: none;
      color: white;
      font-size: 24px;
      display: flex;
      align-items: center;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 64px;
      left: 0;
      width: 100%;
      background: var(--primary-deep);
      flex-direction: column;
      padding: 20px;
      z-index: 998;
    }
    .mobile-menu a {
      color: white;
      padding: 16px 0;
      border-bottom: 1px solid rgba(255,255,255,0.1);
      font-size: 18px;
    }
    /* 按钮 */
    .btn-primary {
      background: linear-gradient(135deg, var(--accent-gold), var(--accent-gold-dark));
      color: var(--primary-deep);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      text-align: center;
      box-shadow: 0 4px 10px rgba(201,169,110,0.3);
    }
    .btn-primary:hover {
      background: var(--accent-gold-hover);
      color: white;
      box-shadow: 0 6px 15px rgba(160,125,58,0.4);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent-gold);
      color: var(--primary-deep);
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    .btn-outline:hover {
      background: var(--primary-deep);
      border-color: var(--primary-deep);
      color: white;
    }
    /* Hero */
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-text {
      flex: 1.1;
    }
    .hero-badge {
      color: var(--accent-gold-dark);
      font-size: 14px;
      letter-spacing: 2px;
      font-weight: 600;
      margin-bottom: 16px;
    }
    h1 {
      font-size: 42px;
      line-height: 1.2;
      font-weight: 700;
      margin-bottom: 20px;
    }
    .hero-desc {
      color: var(--text-gray);
      margin-bottom: 32px;
      font-size: 16px;
    }
    .hero-stats {
      display: flex;
      gap: 24px;
      margin-top: 40px;
    }
    .stat-item {
      background: var(--white);
      border-radius: 12px;
      padding: 12px 20px;
      text-align: center;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
    }
    .stat-num {
      font-family: var(--font-en);
      font-weight: 700;
      font-size: 24px;
      color: var(--accent-gold-dark);
    }
    .hero-image {
      flex: 0.9;
    }
    .hero-image img {
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(26,60,52,0.15);
      width: 100%;
    }
    /* 板块标题 */
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-title h2 {
      font-size: 32px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .section-title p {
      color: var(--text-gray);
    }
    /* 卡片网格 */
    .grid-3, .grid-4 {
      display: grid;
      gap: 24px;
    }
    .grid-3 { grid-template-columns: repeat(3,1fr); }
    .grid-4 { grid-template-columns: repeat(4,1fr); }
    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }
    .card:hover {
      box-shadow: var(--card-shadow-hover);
      transform: translateY(-4px);
    }
    .card-icon {
      font-size: 32px;
      color: var(--accent-gold);
      margin-bottom: 20px;
    }
    .card h3 {
      font-size: 20px;
      margin-bottom: 12px;
    }
    .service-card img {
      border-radius: var(--radius-inner);
      height: 180px;
      object-fit: cover;
      width: 100%;
      margin-bottom: 20px;
    }
    /* 数据墙 */
    .badge-wall {
      display: flex;
      justify-content: center;
      gap: 32px;
      flex-wrap: wrap;
    }
    .badge-item {
      background: linear-gradient(135deg, var(--primary-deep), var(--primary-bright));
      border-radius: var(--radius-card);
      padding: 32px 40px;
      text-align: center;
      min-width: 160px;
      color: white;
    }
    .badge-num {
      font-family: var(--font-en);
      font-size: 48px;
      font-weight: 700;
      color: var(--accent-gold);
    }
    /* FAQ */
    .faq-item {
      margin-bottom: 8px;
    }
    .faq-question {
      background: var(--primary-deep);
      color: white;
      padding: 16px 24px;
      border-radius: var(--radius-faq);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 500;
    }
    .faq-answer {
      background: white;
      padding: 0 24px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s;
      border-radius: 0 0 var(--radius-faq) var(--radius-faq);
      color: var(--text-gray);
    }
    .faq-item.active .faq-answer {
      padding: 20px 24px;
      max-height: 200px;
    }
    /* CTA */
    .cta-block {
      background: var(--primary-deep);
      border-radius: 24px;
      padding: 60px;
      text-align: center;
      color: white;
    }
    .cta-form input {
      padding: 14px;
      border-radius: 8px;
      border: 1px solid var(--border-light);
      width: 100%;
      margin-bottom: 16px;
    }
    .footer {
      background: var(--primary-deep);
      color: rgba(255,255,255,0.7);
      padding: 40px 0;
      margin-top: 80px;
    }
    .back-to-top {
      position: fixed;
      bottom: 30px;
      right: 30px;
      background: var(--accent-gold);
      color: var(--primary-deep);
      width: 44px;
      height: 44px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    }
    @media (max-width: 1024px) {
      .side-nav { display: none; }
      .mobile-header { display: flex; }
      .main-content { margin-left: 0; width: 100%; }
      .hero-grid { flex-direction: column; }
      h1 { font-size: 36px; }
    }
    @media (max-width: 768px) {
      .grid-3, .grid-4 { grid-template-columns: 1fr; }
      .badge-wall { gap: 20px; }
      .badge-num { font-size: 36px; }
      section { padding: 60px 0; }
      h2 { font-size: 24px; }
    }