/* roulang page: index */
:root {
      --primary-green: #0A6E5C;
      --accent-amber: #F28C28;
      --dark-stone: #1A1D20;
      --soft-white: #F7F8F9;
      --text-dark: #1E1E1E;
      --text-light: #E8ECEF;
      --text-muted: #6C757D;
      --card-bg-light: #ffffff;
      --card-bg-dark: rgba(26, 29, 32, 0.75);
      --border-light: rgba(0,0,0,0.08);
      --border-dark: rgba(255,255,255,0.12);
      --shadow-card: 0 12px 28px rgba(0, 0, 0, 0.06), 0 4px 12px rgba(0,0,0,0.03);
      --radius-card: 16px;
      --radius-btn: 10px;
      --radius-input: 8px;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Inter', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Inter', sans-serif;
      --transition: 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
      --container-max: 1280px;
      --section-gap: 90px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-body);
      background-color: var(--soft-white);
      color: var(--text-dark);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      background: var(--soft-white);
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 28px;
    }

    /* 导航 */
    .nav-bar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      padding: 16px 0;
      transition: background 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
      background: transparent;
    }
    .nav-bar.scrolled {
      background: rgba(26, 29, 32, 0.82);
      backdrop-filter: blur(12px);
      box-shadow: 0 8px 20px rgba(0,0,0,0.25);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 28px;
    }
    .logo {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: 0.5px;
      color: #fff;
      display: flex;
      align-items: center;
      gap: 6px;
      text-shadow: 0 2px 6px rgba(0,0,0,0.3);
      transition: color 0.2s;
    }
    .nav-links {
      display: flex;
      gap: 2.2rem;
      align-items: center;
      font-weight: 500;
      font-size: 0.95rem;
      color: rgba(255,255,255,0.9);
    }
    .nav-links a {
      position: relative;
      padding: 6px 0;
      color: rgba(255,255,255,0.85);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-green);
      transition: width 0.25s;
    }
    .nav-links a:hover {
      color: #fff;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-primary-nav {
      background: var(--accent-amber);
      color: #fff;
      padding: 11px 26px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      letter-spacing: 0.3px;
      box-shadow: 0 6px 16px rgba(242,140,40,0.35);
      transition: 0.2s;
      border: none;
      cursor: pointer;
      display: inline-block;
    }
    .btn-primary-nav:hover {
      background: #e07c1a;
      transform: translateY(-1px);
      box-shadow: 0 10px 22px rgba(242,140,40,0.5);
    }

    /* 移动端底部导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(26,29,32,0.96);
      backdrop-filter: blur(16px);
      border-top: 1px solid rgba(255,255,255,0.12);
      z-index: 1100;
      padding: 8px 16px 12px;
      justify-content: space-around;
      align-items: center;
    }
    .mobile-nav a {
      color: rgba(255,255,255,0.7);
      font-size: 0.75rem;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 3px;
      font-weight: 500;
    }
    .mobile-nav .cta-circle {
      background: var(--accent-amber);
      width: 50px;
      height: 50px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 700;
      font-size: 0.9rem;
      margin-top: -18px;
      box-shadow: 0 6px 18px rgba(242,140,40,0.5);
    }

    /* Hero */
    .hero-section {
      background: radial-gradient(circle at 50% 30%, #1e2b2a 0%, #0f1817 90%);
      min-height: 95vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding-top: 80px;
    }
    .hero-bg-img {
      position: absolute;
      right: 0;
      top: 0;
      width: 50%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.9;
      mask-image: linear-gradient(to left, rgba(0,0,0,0.8) 20%, transparent 95%);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 2rem;
      align-items: center;
      position: relative;
      z-index: 2;
    }
    .hero-left h1 {
      font-family: var(--font-title);
      font-size: 3.5rem;
      font-weight: 700;
      color: #fff;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 1.5rem;
    }
    .hero-left .sub {
      font-size: 1.1rem;
      color: rgba(232,236,239,0.9);
      margin-bottom: 2.2rem;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }
    .btn-outline-light {
      border: 1.5px solid var(--primary-green);
      color: #fff;
      padding: 14px 30px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      background: transparent;
      transition: 0.2s;
    }
    .btn-outline-light:hover {
      background: rgba(10,110,92,0.15);
    }

    @media (max-width: 1023px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-bg-img {
        width: 100%;
        opacity: 0.25;
      }
      .hero-left h1 {
        font-size: 2.5rem;
      }
      .nav-links {
        display: none;
      }
      .mobile-nav {
        display: flex;
      }
    }

    /* sections */
    section {
      padding: var(--section-gap) 0;
    }

    .highlight-grid {
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 24px;
      align-items: stretch;
    }
    .card-large {
      background: #fff;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
    }
    .card-small {
      background: #fff;
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .icon-amber {
      color: var(--accent-amber);
      font-size: 2rem;
      margin-bottom: 16px;
    }
    @media (max-width: 768px) {
      .highlight-grid {
        grid-template-columns: 1fr;
      }
    }

    .services-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
    }
    .service-card {
      min-width: 280px;
      background: #fff;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      flex-shrink: 0;
    }
    .service-card img {
      height: 180px;
      object-fit: cover;
    }

    .dark-band {
      background: var(--dark-stone);
      color: var(--text-light);
    }
    .stats {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--accent-amber);
    }

    .compare-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px,1fr));
      gap: 28px;
    }
    .compare-card {
      background: #fff;
      border-radius: var(--radius-card);
      padding: 32px;
      border: 1.5px solid transparent;
      box-shadow: var(--shadow-card);
      transition: 0.2s;
    }
    .compare-card.recommended {
      border-color: var(--primary-green);
      position: relative;
    }
    .badge {
      background: var(--primary-green);
      color: #fff;
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 0.75rem;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 12px;
    }

    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    @media (max-width: 768px) {
      .faq-grid { grid-template-columns: 1fr; }
    }

    footer {
      background: var(--dark-stone);
      color: #ccc;
      padding: 48px 0 24px;
    }

    .btn-primary {
      background: var(--primary-green);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      border: none;
      cursor: pointer;
      transition: 0.25s;
    }
    .btn-primary:hover {
      background: var(--accent-amber);
      transform: translateY(-2px);
    }