/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --primary-deep: #0A1F3F;
      --accent-gold: #C9A96E;
      --accent-gold-hover: #B8922E;
      --bg-light: #F8F9FC;
      --bg-gradient-end: #EBEEF5;
      --card-bg: #FFFFFF;
      --text-body: #1A1A1A;
      --text-muted: #4A4A4A;
      --text-on-dark: #B0B8C5;
      --border-light: #E5E8ED;
      --shadow-sm: 0 4px 20px rgba(10, 31, 63, 0.06);
      --shadow-hover: 0 8px 30px rgba(10, 31, 63, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-heading: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --font-body: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --font-number: 'Inter', 'Noto Sans SC', sans-serif;
      --nav-height-desktop: 72px;
      --bottom-tab-height: 64px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: var(--font-body);
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      padding-bottom: 0; /* 桌面端无底部tab */
    }

    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 700;
      color: var(--primary-deep);
      margin-top: 0;
    }

    h1 { font-size: 44px; line-height: 1.2; }
    h2 { font-size: 32px; margin-bottom: 1rem; }
    h3 { font-size: 20px; margin-bottom: 0.5rem; }

    a {
      color: var(--primary-deep);
      text-decoration: none;
      transition: color 0.25s ease;
    }

    a:hover {
      color: var(--accent-gold);
    }

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 自定义按钮覆盖 */
    .btn-primary {
      background: var(--accent-gold);
      color: var(--primary-deep);
      font-weight: 700;
      border-radius: var(--radius-btn);
      padding: 0.85rem 2rem;
      font-size: 1rem;
      border: none;
      transition: background 0.25s ease, transform 0.2s;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      letter-spacing: 0.5px;
      font-family: var(--font-number);
    }
    .btn-primary:hover {
      background: var(--accent-gold-hover);
      color: var(--primary-deep);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary-deep);
      color: var(--primary-deep);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.8rem 2rem;
      font-size: 1rem;
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-family: var(--font-number);
    }
    .btn-outline:hover {
      background: rgba(10, 31, 63, 0.04);
      border-color: var(--accent-gold);
      color: var(--accent-gold);
    }

    /* 导航栏 - 桌面玻璃效果 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 40;
      height: var(--nav-height-desktop);
      background: rgba(248, 249, 252, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(229, 232, 237, 0.8);
      display: flex;
      align-items: center;
    }

    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--primary-deep);
      letter-spacing: -0.5px;
    }
    .logo span {
      color: var(--accent-gold);
    }

    .desktop-nav {
      display: flex;
      gap: 2.2rem;
      align-items: center;
    }
    .desktop-nav a {
      color: var(--text-muted);
      font-weight: 500;
      font-size: 0.95rem;
      padding: 0.3rem 0;
      border-bottom: 2px solid transparent;
      transition: color 0.2s, border-color 0.2s;
    }
    .desktop-nav a:hover,
    .desktop-nav a.active {
      color: var(--accent-gold);
      border-bottom-color: var(--accent-gold);
    }

    .mobile-menu-trigger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary-deep);
    }

    /* 底部 Tab (移动端) */
    .bottom-tab-bar {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: var(--bottom-tab-height);
      background: #FFFFFF;
      border-top: 1px solid var(--border-light);
      z-index: 50;
      justify-content: space-around;
      align-items: center;
      box-shadow: 0 -2px 12px rgba(0,0,0,0.03);
    }
    .tab-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: #8A8F99;
      font-size: 0.7rem;
      transition: color 0.2s;
      text-decoration: none;
    }
    .tab-item i {
      font-size: 1.4rem;
      margin-bottom: 2px;
    }
    .tab-item.active {
      color: var(--accent-gold);
    }

    /* Hero 区域 */
    .hero-section {
      background: linear-gradient(135deg, var(--bg-light) 0%, var(--bg-gradient-end) 100%);
      padding: 4rem 0 5rem;
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      margin-bottom: 1.2rem;
    }
    .hero-text p {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 2rem;
      max-width: 500px;
    }
    .hero-actions {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .hero-visual {
      flex: 1;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 360px;
      border-radius: 24px;
      box-shadow: var(--shadow-sm);
      position: relative;
    }
    /* 金色网格装饰 */
    .hero-visual::after {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 20% 30%, rgba(201,169,110,0.08) 0%, transparent 50%);
      pointer-events: none;
    }

    /* 通用板块 */
    .section {
      padding: 5rem 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 3rem;
    }
    .section-title h2 {
      margin-bottom: 0.5rem;
    }
    .section-title p {
      color: var(--text-muted);
    }

    /* 优势卡片 */
    .advantage-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 2rem 1.8rem;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      text-align: center;
      height: 100%;
    }
    .advantage-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .advantage-icon {
      font-size: 2.2rem;
      color: var(--accent-gold);
      margin-bottom: 1.2rem;
    }

    /* 功能网格 */
    .feature-grid-item {
      display: flex;
      gap: 1.4rem;
      background: var(--card-bg);
      padding: 1.8rem;
      border-radius: var(--radius-card);
      align-items: flex-start;
      box-shadow: var(--shadow-sm);
      transition: box-shadow 0.2s;
    }
    .feature-icon {
      width: 48px;
      height: 48px;
      background: rgba(201,169,110,0.1);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent-gold);
      font-size: 1.6rem;
    }

    /* 场景卡片 */
    .scene-card {
      background: #fff;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: 0.25s;
    }
    .scene-card:hover {
      box-shadow: var(--shadow-hover);
    }
    .scene-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }

    /* 数据条 */
    .stat-number {
      font-family: var(--font-number);
      font-weight: 700;
      font-size: 36px;
      color: var(--accent-gold);
    }

    /* 价格卡 */
    .price-card {
      background: #fff;
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      border: 1px solid transparent;
      transition: 0.25s;
      text-align: center;
    }
    .price-card.highlight {
      border-color: var(--accent-gold);
      box-shadow: 0 10px 30px rgba(201,169,110,0.15);
    }
    .price-amount {
      font-family: var(--font-number);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--primary-deep);
    }

    /* FAQ */
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
    }
    .accordion-title {
      font-weight: 600;
      color: var(--primary-deep);
      padding: 1rem 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }

    /* 终局 CTA */
    .cta-final {
      background: var(--primary-deep);
      color: white;
      text-align: center;
      padding: 5rem 1.5rem;
    }

    /* 页脚 */
    .site-footer {
      background: var(--primary-deep);
      color: var(--text-on-dark);
      padding: 3rem 0 1.5rem;
    }
    .footer-links a {
      color: var(--text-on-dark);
      display: block;
      margin-bottom: 0.5rem;
    }
    .footer-links a:hover {
      color: var(--accent-gold);
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 2rem;
      padding-top: 1.5rem;
      font-size: 0.85rem;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      h1 { font-size: 36px; }
      .hero-grid {
        flex-direction: column;
      }
      .hero-visual {
        min-height: 280px;
        width: 100%;
      }
    }

    @media (max-width: 640px) {
      body {
        padding-bottom: var(--bottom-tab-height);
      }
      .desktop-nav {
        display: none;
      }
      .mobile-menu-trigger {
        display: block;
      }
      .bottom-tab-bar {
        display: flex;
      }
      .site-header {
        height: 60px;
      }
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      .hero-section {
        padding: 2.5rem 0 3rem;
      }
    }