/* roulang page: index */
:root {
      --brand-red: #E03E2D;
      --brand-red-hover: #C12F1F;
      --brand-red-light: #FDEDEA;
      --ink-black: #1C1C1E;
      --warm-stone: #F7F5F2;
      --pure-white: #FFFFFF;
      --gold-accent: #C8A45C;
      --border-light: #E8E5E0;
      --text-secondary: #5A5A5E;
      --text-muted: #9E9E9E;
      --shadow-sm: 0 2px 8px rgba(28,28,30,0.04);
      --shadow-hover: 0 12px 32px rgba(28,28,30,0.08);
      --radius-card-lg: 20px;
      --radius-card-md: 14px;
      --radius-btn: 10px;
      --radius-badge: 12px;
      --font-body: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --font-number: 'Inter', 'Noto Sans SC', sans-serif;
      --max-width: 1280px;
      --nav-height: 72px;
      --bottom-tab-height: 64px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--warm-stone);
      color: var(--ink-black);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      padding-bottom: 0;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.25s ease;
    }
    .grid-container {
      max-width: var(--max-width);
      padding-left: 16px;
      padding-right: 16px;
    }
    /* 顶部导航 */
    .site-header {
      background: var(--warm-stone);
      border-bottom: 1px solid var(--border-light);
      height: var(--nav-height);
      position: sticky;
      top: 0;
      z-index: 40;
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 16px;
    }
    .logo {
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: -0.5px;
      color: var(--ink-black);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      color: var(--brand-red);
      font-size: 1.8rem;
    }
    .desktop-nav {
      display: flex;
      align-items: center;
      gap: 2rem;
      font-size: 0.95rem;
      font-weight: 500;
    }
    .desktop-nav a {
      color: var(--ink-black);
      position: relative;
      padding: 6px 0;
    }
    .desktop-nav a:hover,
    .desktop-nav a.active {
      color: var(--brand-red);
    }
    .desktop-nav a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 3px;
      background: var(--brand-red);
      transition: width 0.25s ease;
    }
    .desktop-nav a:hover::after,
    .desktop-nav a.active::after {
      width: 100%;
    }
    .btn-primary {
      background: var(--brand-red);
      color: white;
      border: none;
      border-radius: var(--radius-btn);
      padding: 0.7rem 1.8rem;
      font-weight: 600;
      font-size: 0.95rem;
      cursor: pointer;
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      gap: 0.4rem;
      white-space: nowrap;
    }
    .btn-primary:hover {
      background: var(--brand-red-hover);
      transform: scale(1.02);
      color: white;
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--brand-red);
      color: var(--brand-red);
      border-radius: var(--radius-btn);
      padding: 0.65rem 1.8rem;
      font-weight: 600;
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      gap: 0.4rem;
    }
    .btn-outline:hover {
      background: var(--brand-red-light);
      color: var(--brand-red);
    }
    /* 底部移动Tab */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: var(--bottom-tab-height);
      background: var(--pure-white);
      box-shadow: 0 -2px 10px rgba(0,0,0,0.05);
      z-index: 50;
      justify-content: space-around;
      align-items: center;
      padding: 0 8px;
    }
    .mobile-tab {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: var(--text-muted);
      font-size: 10px;
      transition: color 0.2s;
      font-weight: 500;
    }
    .mobile-tab i {
      font-size: 22px;
      margin-bottom: 2px;
    }
    .mobile-tab.active {
      color: var(--brand-red);
    }
    /* 板块通用 */
    .section {
      padding: 70px 0;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      margin-bottom: 0.5rem;
      letter-spacing: -0.3px;
    }
    .section-sub {
      color: var(--text-secondary);
      font-size: 1.1rem;
      max-width: 680px;
      margin: 0 auto 3rem auto;
    }
    .text-center {
      text-align: center;
    }
    /* Hero */
    .hero {
      background: var(--ink-black);
      color: white;
      padding: 50px 0 70px;
      position: relative;
    }
    .hero-content h1 {
      font-size: 2.8rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.2rem;
    }
    .hero-content p {
      font-size: 1.2rem;
      opacity: 0.9;
      margin-bottom: 2rem;
    }
    .trust-badges {
      display: flex;
      gap: 1.8rem;
      margin-top: 1.8rem;
      color: var(--gold-accent);
      font-weight: 500;
      font-size: 0.9rem;
    }
    .trust-badges i {
      margin-right: 5px;
    }
    .hero-image {
      background: #2A2A2E;
      border-radius: var(--radius-card-lg);
      overflow: hidden;
      aspect-ratio: 4/3;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
    }
    /* 数据徽章 */
    .stat-badge {
      background: var(--pure-white);
      border: 1px solid var(--gold-accent);
      border-radius: var(--radius-badge);
      padding: 0.6rem 1rem;
      display: inline-flex;
      align-items: baseline;
      gap: 6px;
      font-family: var(--font-number);
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--ink-black);
    }
    .stat-badge small {
      font-size: 0.8rem;
      font-weight: 500;
      color: var(--text-secondary);
    }
    /* 卡片 */
    .feature-card {
      background: var(--pure-white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card-md);
      padding: 2rem 1.5rem;
      transition: all 0.25s ease;
      height: 100%;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--brand-red);
    }
    .horizontal-card {
      background: var(--pure-white);
      border-radius: var(--radius-card-lg);
      padding: 2rem;
      display: flex;
      gap: 2rem;
      align-items: center;
      margin-bottom: 2rem;
      border: 1px solid var(--border-light);
    }
    .card-icon {
      font-size: 2.8rem;
      color: var(--brand-red);
      width: 80px;
      text-align: center;
    }
    /* FAQ */
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
    }
    .accordion-title {
      font-weight: 600;
      font-size: 1.1rem;
      padding: 1.2rem 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      color: var(--ink-black);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
      padding-bottom: 0;
    }
    .accordion-item.active .accordion-content {
      max-height: 200px;
      padding-bottom: 1.2rem;
    }
    /* 价格卡 */
    .pricing-card {
      background: white;
      border-radius: var(--radius-card-lg);
      padding: 2.5rem 1.5rem;
      border: 1px solid var(--border-light);
      text-align: center;
      transition: all 0.25s;
    }
    .pricing-card.recommended {
      border: 2px solid var(--brand-red);
      position: relative;
    }
    .badge-popular {
      background: var(--gold-accent);
      color: #1C1C1E;
      font-weight: 700;
      font-size: 0.8rem;
      padding: 0.3rem 1rem;
      border-radius: 20px;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
    }
    .footer {
      background: var(--ink-black);
      color: #ccc;
      padding: 3rem 0 1.5rem;
    }
    @media (max-width: 1023px) {
      .desktop-nav {
        display: none;
      }
      .mobile-bottom-nav {
        display: flex;
      }
      body {
        padding-bottom: 80px;
      }
      .footer {
        padding-bottom: 100px;
      }
    }
    @media (max-width: 639px) {
      .hero-content h1 {
        font-size: 2rem;
      }
      .horizontal-card {
        flex-direction: column;
      }
      .section-title {
        font-size: 1.8rem;
      }
    }