/* roulang page: index */
:root {
      --primary: #0A7E3E;
      --primary-deep: #065A2C;
      --primary-rgba: 10, 126, 62;
      --secondary: #1A1A2E;
      --accent: #F5A623;
      --accent-deep: #E5940F;
      --bg: #F7F9FC;
      --white: #FFFFFF;
      --text-main: #1A1A2E;
      --text-body: #3A3A4A;
      --text-muted: #6B7280;
      --border-light: #E5E7EB;
      --shadow-card: 0 10px 25px -8px rgba(0,0,0,0.05), 0 4px 10px -2px rgba(0,0,0,0.02);
      --shadow-hover: 0 20px 35px -12px rgba(0,0,0,0.08), 0 8px 18px -4px rgba(0,0,0,0.04);
      --radius-card: 20px;
      --radius-btn: 12px;
      --radius-pill: 40px;
      --font-sans: "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
      --transition: 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }

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

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

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

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 PC */
    .desktop-nav {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      height: 68px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(229,231,235,0.5);
      box-shadow: 0 6px 18px rgba(0,0,0,0.02);
      display: flex;
      align-items: center;
      z-index: 100;
      padding: 0 28px;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--secondary);
      letter-spacing: 0.5px;
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, #0A7E3E 30%, #F5A623);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 20px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      font-weight: 600;
      color: var(--text-muted);
    }
    .nav-links a {
      position: relative;
      padding: 4px 0;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
      border-radius: 4px;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    /* 移动端底部导航 (默认隐藏) */
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 16px;
      left: 16px;
      right: 16px;
      background: rgba(255,255,255,0.94);
      backdrop-filter: blur(28px);
      border-radius: 32px;
      padding: 10px 20px;
      box-shadow: 0 18px 34px rgba(0,0,0,0.12);
      justify-content: space-around;
      align-items: center;
      z-index: 110;
      border: 1px solid rgba(255,255,255,0.6);
    }
    .mobile-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 12px;
      font-weight: 600;
      color: var(--text-muted);
      gap: 4px;
      transition: 0.2s;
    }
    .mobile-nav a i { font-size: 1.3rem; }
    .mobile-nav a.active { color: var(--primary); }

    h1, h2, h3, h4 {
      font-weight: 700;
      color: var(--text-main);
    }
    h1 { font-size: 2.6rem; line-height: 1.2; letter-spacing: -0.3px; }
    h2 { font-size: 2rem; line-height: 1.25; }
    h3 { font-size: 1.4rem; line-height: 1.3; }
    
    section {
      padding: 90px 0;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      transition: var(--transition);
      border: none;
      cursor: pointer;
      font-size: 1rem;
      letter-spacing: 0.2px;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
    }
    .btn-primary:hover { background: var(--primary-deep); }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover { background: rgba(var(--primary-rgba), 0.06); }
    .btn-accent {
      background: var(--accent);
      color: #1A1A2E;
      border-radius: var(--radius-pill);
      padding: 18px 42px;
      font-weight: 700;
    }
    .btn-accent:hover {
      background: var(--accent-deep);
      transform: scale(1.04);
    }

    .badge {
      background: rgba(245,166,35,0.15);
      color: #B45309;
      padding: 4px 12px;
      border-radius: 40px;
      font-size: 0.8rem;
      font-weight: 600;
      display: inline-block;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .highlight-card {
      background: var(--white);
      padding: 36px 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .highlight-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .highlight-card .icon {
      font-size: 2.3rem;
      color: var(--primary);
      margin-bottom: 20px;
    }

    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      max-width: 800px;
      margin: 0 auto;
    }
    .compare-card {
      background: white;
      border-radius: 24px;
      padding: 36px 28px;
      border: 1px solid var(--border-light);
      position: relative;
    }
    .compare-card.recommended {
      border: 2px solid var(--accent);
      box-shadow: 0 0 0 10px rgba(245,166,35,0.08);
    }
    .recommend-badge {
      position: absolute;
      top: -14px;
      right: 30px;
      background: var(--accent);
      color: #1A1A2E;
      padding: 6px 22px;
      border-radius: 40px;
      font-weight: 700;
      font-size: 0.9rem;
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 24px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 700;
      font-size: 1.15rem;
      cursor: pointer;
    }

    footer {
      background: #1A1A2E;
      color: #9CA3AF;
      padding: 70px 0 35px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 45px;
    }
    
    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .desktop-nav { display: none; }
      .mobile-nav { display: flex; }
      section { padding: 60px 0; }
      h1 { font-size: 2rem; }
      .grid-3, .footer-grid { grid-template-columns: 1fr; }
      .hero-content { flex-direction: column; text-align: center; }
      .hero-image { margin-top: 35px; }
      .compare-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 480px) {
      .container { padding: 0 18px; }
    }
    .hero-flex { display: flex; align-items: center; gap: 50px; }
    .hero-image img { border-radius: 32px; box-shadow: 0 30px 45px rgba(0,0,0,0.15); }