/* roulang page: index */
:root {
      --primary-dark: #1A3C34;
      --accent-gold: #C9A96E;
      --bg-light: #F5F7F6;
      --card-white: #FFFFFF;
      --text-main: #2E3B37;
      --text-heading: #0F2420;
      --text-weak: #6B7A75;
      --border-light: #E2E7E4;
      --footer-bg: #1A2723;
      --footer-text: #A3B5AF;
      --radius-lg: 20px;
      --radius-md: 14px;
      --radius-sm: 8px;
      --shadow-sm: 0 4px 20px rgba(26,60,52,0.06);
      --shadow-hover: 0 12px 32px rgba(26,60,52,0.12);
      --transition: 0.3s ease;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      font-weight: 400;
      font-size: 16px;
      line-height: 1.7;
      color: var(--text-main);
      background-color: var(--bg-light);
      -webkit-font-smoothing: antialiased;
    }
    .container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3 {
      font-family: var(--font-heading);
    }
    a, button {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-weight: 600;
      font-size: 15px;
      letter-spacing: 0.5px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      background: transparent;
    }
    .btn-primary {
      background: var(--primary-dark);
      color: white;
      border-radius: 12px;
      padding: 14px 32px;
      box-shadow: 0 4px 12px rgba(26,60,52,0.15);
    }
    .btn-primary:hover {
      background: #152F28;
      transform: translateY(-2px);
      box-shadow: var(--shadow-hover);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent-gold);
      color: var(--primary-dark);
      border-radius: 12px;
      padding: 14px 32px;
    }
    .btn-outline:hover {
      background: rgba(201,169,110,0.1);
      border-color: #b8914a;
      transform: translateY(-2px);
    }
    .btn-small {
      font-size: 14px;
      padding: 9px 20px;
      border-radius: 10px;
    }
    .text-link {
      color: var(--primary-dark);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 15px;
    }
    .text-link i {
      transition: transform 0.2s;
    }
    .text-link:hover i {
      transform: translateX(4px);
    }
    .badge {
      display: inline-block;
      background: rgba(201,169,110,0.12);
      color: #8b6f3c;
      border-radius: 20px;
      padding: 4px 12px;
      font-size: 13px;
      font-weight: 600;
    }

    /* 导航 */
    .main-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 68px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-light);
      z-index: 100;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo-area {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 24px;
      color: var(--primary-dark);
      letter-spacing: -0.3px;
    }
    .logo-area small {
      font-weight: 400;
      font-size: 14px;
      color: var(--text-weak);
      margin-left: 8px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      color: var(--text-main);
      font-weight: 500;
      font-size: 16px;
      position: relative;
      padding-bottom: 4px;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent-gold);
      transition: width 0.25s ease;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .nav-cta {
      margin-left: 16px;
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 26px;
      color: var(--primary-dark);
    }

    /* Hero */
    .hero {
      padding: 140px 0 80px;
      background: linear-gradient(180deg, #F5F7F6 0%, #EAF0ED 100%);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-left {
      flex: 1 1 50%;
    }
    .hero-right {
      flex: 1 1 50%;
    }
    .hero h1 {
      font-size: clamp(38px, 5vw, 52px);
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--text-heading);
      margin-bottom: 16px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-weak);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .data-panel {
      background: rgba(255,255,255,0.7);
      backdrop-filter: blur(6px);
      border-radius: var(--radius-lg);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      gap: 24px;
      border: 1px solid var(--border-light);
    }
    .data-row {
      display: flex;
      justify-content: space-around;
      gap: 12px;
      flex-wrap: wrap;
    }
    .metric {
      text-align: center;
    }
    .metric-number {
      font-size: 34px;
      font-weight: 700;
      color: var(--accent-gold);
    }
    .metric-label {
      font-size: 14px;
      color: var(--text-weak);
    }

    /* 指标看板 */
    .metrics-section {
      padding: 80px 0;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
      gap: 24px;
      margin-top: 40px;
    }
    .metric-card {
      background: var(--card-white);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .metric-big {
      font-size: 40px;
      font-weight: 700;
      color: var(--primary-dark);
      margin-bottom: 6px;
    }
    .metric-tag {
      font-size: 16px;
      color: var(--text-weak);
    }

    /* 服务矩阵 */
    .services-section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 34px;
      font-weight: 600;
      color: var(--text-heading);
      margin-bottom: 48px;
    }
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--card-white);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      position: relative;
      overflow: hidden;
    }
    .service-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 0%;
      height: 4px;
      background: var(--accent-gold);
      transition: width 0.3s;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .service-card:hover::before {
      width: 100%;
    }
    .service-icon {
      font-size: 36px;
      color: var(--accent-gold);
      margin-bottom: 18px;
    }
    .service-card h3 {
      font-size: 20px;
      margin-bottom: 12px;
    }

    /* 对比 */
    .compare-section {
      padding: 80px 0;
    }
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      margin-top: 40px;
    }
    .compare-card {
      background: var(--card-white);
      border-radius: var(--radius-lg);
      padding: 36px 28px;
      box-shadow: var(--shadow-sm);
      position: relative;
    }
    .compare-card.recommend {
      border: 1px solid var(--accent-gold);
      background: #fffdf7;
    }
    .recommend-badge {
      position: absolute;
      top: 18px;
      right: 20px;
      background: var(--accent-gold);
      color: white;
      font-size: 13px;
      padding: 2px 14px;
      border-radius: 20px;
    }
    .compare-features {
      list-style: none;
      margin: 28px 0;
    }
    .compare-features li {
      margin-bottom: 14px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .fa-check-circle {
      color: #1A3C34;
    }
    .fa-times-circle {
      color: #c0c9c4;
    }

    /* FAQ */
    .faq-section {
      padding: 80px 0;
    }
    .faq-list {
      max-width: 800px;
      margin: 40px auto 0;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      color: var(--primary-dark);
      cursor: pointer;
      font-size: 18px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.25s ease;
      color: var(--text-main);
      padding-right: 30px;
    }
    .faq-item.active .faq-answer {
      max-height: 150px;
      padding-top: 16px;
    }

    /* CTA */
    .cta-block {
      background: var(--primary-dark);
      padding: 70px 24px;
      text-align: center;
      border-radius: 0px;
      margin: 60px 0;
    }
    .cta-block h2 {
      color: white;
      font-size: 34px;
    }
    .cta-sub {
      color: rgba(255,255,255,0.75);
      margin: 16px 0 28px;
    }
    .btn-gold {
      background: var(--accent-gold);
      color: #1A3C34;
      padding: 14px 40px;
      border-radius: 12px;
      font-weight: 700;
    }
    .btn-gold:hover {
      background: #D4B87A;
      transform: translateY(-2px);
    }

    /* 页脚 */
    .footer {
      background: var(--footer-bg);
      color: var(--footer-text);
      padding: 50px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 36px;
    }
    .footer a {
      color: var(--footer-text);
    }
    .footer a:hover {
      color: var(--accent-gold);
    }

    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: 1fr 1fr; }
      .hero-grid { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .services-grid, .compare-grid { grid-template-columns: 1fr; }
      .nav-cta { display: none; }
      .mobile-menu {
        position: fixed; top:0; right:0; width:75%; height:100%;
        background: var(--primary-dark); flex-direction: column; 
        padding: 80px 30px; gap: 30px; display: flex; z-index:200;
        transform: translateX(100%); transition: 0.3s;
      }
      .mobile-menu.open { transform: translateX(0); }
      .mobile-menu a { color: white; font-size: 18px; }
    }
    @media (max-width: 520px) {
      .metrics-grid { grid-template-columns: 1fr 1fr; }
      .hero h1 { font-size: 34px; }
    }