/* roulang page: index */
:root {
      --primary-green: #0A7E3D;
      --primary-green-dark: #065A2C;
      --accent-gold: #D4A843;
      --accent-gold-light: #E5C15A;
      --dark-bg: #1A1D23;
      --light-bg: #F7F8FA;
      --text-primary: #1E2126;
      --text-secondary: #5A6170;
      --white: #FFFFFF;
      --border-light: #EAECF0;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-pill: 50px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --max-width: 1200px;
      --section-padding: 5rem 0;
      --transition-smooth: all 0.3s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: var(--font-sans);
      line-height: 1.7;
      color: var(--text-primary);
      background-color: var(--light-bg);
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      border: none;
      transition: var(--transition-smooth);
      font-weight: 700;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 2rem;
    }
    /* 导航 */
    #nav {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid transparent;
      transition: var(--transition-smooth);
    }
    #nav.scrolled {
      box-shadow: 0 2px 20px rgba(0,0,0,0.06);
      border-bottom-color: var(--border-light);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 1rem 2rem;
    }
    .logo {
      font-size: 1.75rem;
      font-weight: 800;
      color: var(--primary-green);
      display: flex;
      align-items: center;
      gap: 0.5rem;
      letter-spacing: -0.01em;
    }
    .logo i {
      color: var(--accent-gold);
      font-size: 2rem;
    }
    .nav-menu {
      display: flex;
      gap: 2.5rem;
      align-items: center;
      list-style: none;
    }
    .nav-menu a {
      font-weight: 600;
      color: var(--text-primary);
      position: relative;
      padding: 0.25rem 0;
      font-size: 1rem;
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-gold);
      transition: width 0.25s ease;
    }
    .nav-menu a:hover::after {
      width: 100%;
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--text-primary);
    }
    /* 移动端菜单 */
    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--white);
        flex-direction: column;
        padding: 5rem 2rem;
        gap: 2rem;
        transition: right 0.35s ease;
        box-shadow: -5px 0 25px rgba(0,0,0,0.15);
      }
      .nav-menu.active {
        right: 0;
      }
      .menu-toggle {
        display: block;
      }
    }
    /* Hero */
    #hero {
      background: linear-gradient(135deg, rgba(10,126,61,0.85) 0%, rgba(26,29,35,0.9) 80%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      color: var(--white);
      padding: 6rem 0;
      display: flex;
      align-items: center;
      min-height: 85vh;
      position: relative;
      overflow: hidden;
    }
    .hero-content {
      max-width: 650px;
    }
    .hero h1 {
      font-size: clamp(2.5rem, 5vw, 4rem);
      font-weight: 800;
      letter-spacing: -0.02em;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    .hero .subtitle {
      font-size: 1.2rem;
      margin-bottom: 2rem;
      color: rgba(255,255,255,0.9);
    }
    .gold-highlight {
      color: var(--accent-gold);
      font-weight: 700;
    }
    .btn-group {
      display: flex;
      flex-wrap: wrap;
      gap: 1rem;
    }
    .btn-primary {
      background: var(--primary-green);
      color: white;
      border-radius: var(--radius-pill);
      padding: 0.9rem 2.2rem;
      font-size: 1rem;
      box-shadow: 0 4px 12px rgba(10,126,61,0.3);
    }
    .btn-primary:hover {
      background: var(--primary-green-dark);
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      color: white;
      border: 2px solid white;
      border-radius: var(--radius-pill);
      padding: 0.9rem 2.2rem;
      font-size: 1rem;
    }
    .btn-outline:hover {
      background: white;
      color: var(--primary-green);
    }
    .btn-gold {
      background: var(--accent-gold);
      color: #1A1D23;
      border-radius: var(--radius-pill);
      padding: 1rem 2.5rem;
      font-size: 1.1rem;
      font-weight: 800;
    }
    .btn-gold:hover {
      background: var(--accent-gold-light);
      transform: scale(1.03);
    }
    /* 通用区块 */
    section {
      padding: var(--section-padding);
    }
    .section-title {
      font-size: clamp(1.8rem, 3.5vw, 2.5rem);
      font-weight: 700;
      margin-bottom: 2.5rem;
      text-align: center;
      color: var(--text-primary);
    }
    /* 核心优势非对称 */
    .features-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
      align-items: start;
    }
    .feature-main {
      grid-row: span 2;
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 2.5rem;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
    }
    .feature-item {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
    }
    .feature-icon {
      font-size: 2.2rem;
      color: var(--primary-green);
      margin-bottom: 1rem;
    }
    /* 功能分组交替 */
    .module-row {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 4rem;
    }
    .module-row.reverse {
      flex-direction: row-reverse;
    }
    .module-img {
      flex: 1;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .module-img img {
      width: 100%;
      height: 300px;
      object-fit: cover;
    }
    .module-text {
      flex: 1;
    }
    .tag {
      background: rgba(10,126,61,0.1);
      color: var(--primary-green);
      padding: 0.25rem 0.9rem;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
      display: inline-block;
      margin-right: 0.5rem;
    }
    /* 场景卡片 */
    .scenario-cards {
      display: flex;
      gap: 2rem;
      overflow-x: auto;
      padding-bottom: 1rem;
    }
    .scenario-card {
      min-width: 280px;
      background: white;
      border-radius: var(--radius-lg);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      border-left: 5px solid var(--accent-gold);
      flex: 1;
    }
    /* 数据深色区 */
    .dark-band {
      background: var(--dark-bg);
      color: white;
    }
    .stats-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
      gap: 2rem;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 800;
      color: var(--primary-green);
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1.5rem 0;
    }
    .faq-question {
      font-weight: 700;
      font-size: 1.2rem;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 1rem;
    }
    /* 页脚 */
    footer {
      background: var(--dark-bg);
      color: #ccc;
      padding: 3rem 0 1.5rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }
    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: 1fr; }
      .module-row, .module-row.reverse { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .container { padding: 0 1.5rem; }
      .footer-grid { grid-template-columns: 1fr; }
    }