/* roulang page: index */
:root {
      --primary: #E8453C;
      --primary-hover: #C0392B;
      --secondary: #1A1A2E;
      --accent: #F0A500;
      --bg-soft: #F7F5F2;
      --bg-white: #FFFFFF;
      --text-main: #1A1A2E;
      --text-muted: #6B7280;
      --border-light: #E5E7EB;
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-badge: 20px;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.12);
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --spacing-section: 80px;
      --max-width: 1200px;
      --header-height: 72px;
    }

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

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

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      transition: all 0.2s ease;
      border: none;
      background: none;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(8px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.06);
      height: var(--header-height);
      display: flex;
      align-items: center;
    }

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

    .logo {
      font-weight: 800;
      font-size: 1.5rem;
      color: var(--secondary);
      letter-spacing: -0.02em;
    }
    .logo span {
      color: var(--primary);
    }

    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
      font-weight: 600;
      color: var(--text-main);
    }

    .nav-links a {
      padding: 0.25rem 0;
      border-bottom: 2px solid transparent;
    }

    .nav-links a:hover, .nav-links a:focus-visible {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      box-shadow: 0 4px 10px rgba(232,69,60,0.3);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      letter-spacing: 0.02em;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 6px 14px rgba(192,57,43,0.4);
      transform: translateY(-1px);
    }

    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
      padding: 10px 26px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-outline:hover {
      background: rgba(232,69,60,0.08);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      padding: 4px;
    }
    .hamburger span {
      width: 26px;
      height: 3px;
      background: var(--secondary);
      border-radius: 4px;
      transition: 0.2s;
    }

    /* 响应式导航 */
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: white;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        display: none;
        gap: 2rem;
        z-index: 100;
        font-size: 1.5rem;
      }
      .mobile-menu.active {
        display: flex;
      }
      .mobile-menu .close-btn {
        position: absolute;
        top: 24px;
        right: 24px;
        font-size: 2rem;
        background: none;
        border: none;
        color: var(--secondary);
      }
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #E8453C 0%, #1A1A2E 100%);
      position: relative;
      overflow: hidden;
      padding: 100px 0;
      display: flex;
      align-items: center;
      min-height: 85vh;
      color: white;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      mix-blend-mode: overlay;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }
    .hero h1 {
      font-size: 2.8rem;
      font-weight: 800;
      letter-spacing: -0.02em;
      margin-bottom: 1.25rem;
      line-height: 1.2;
    }
    .hero p {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.85);
      margin-bottom: 2rem;
    }
    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    @media (max-width: 768px) {
      .hero {
        padding: 64px 0;
        min-height: 70vh;
      }
      .hero h1 {
        font-size: 1.9rem;
      }
      .hero-buttons .btn {
        width: 100%;
      }
    }

    /* 通用区块 */
    section {
      padding: var(--spacing-section) 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 48px 0;
      }
    }

    .section-title {
      font-size: 1.9rem;
      font-weight: 700;
      margin-bottom: 1rem;
      color: var(--secondary);
    }
    .section-subtitle {
      color: var(--text-muted);
      font-size: 1.1rem;
      margin-bottom: 2.5rem;
    }

    /* 卡片网格 */
    .grid-4, .grid-3, .grid-2 {
      display: grid;
      gap: 24px;
    }
    .grid-4 { grid-template-columns: repeat(4, 1fr); }
    .grid-3 { grid-template-columns: repeat(3, 1fr); }
    .grid-2 { grid-template-columns: repeat(2, 1fr); }

    .card {
      background: white;
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      border: 1px solid var(--border-light);
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    .badge {
      background: var(--accent);
      color: var(--secondary);
      font-weight: 700;
      font-size: 0.8rem;
      padding: 4px 14px;
      border-radius: var(--radius-badge);
      display: inline-block;
      margin-bottom: 12px;
    }

    .data-number {
      font-size: 2rem;
      font-weight: 800;
      color: var(--accent);
    }

    /* 场景卡片图片 */
    .scenario-img {
      width: 100%;
      height: 180px;
      object-fit: cover;
      border-radius: 12px;
      margin-bottom: 16px;
    }

    /* 价格卡片高亮 */
    .pricing-highlight {
      border: 2px solid var(--accent);
      position: relative;
    }
    .pricing-highlight::before {
      content: "🔥 推荐";
      position: absolute;
      top: 12px;
      right: 12px;
      background: var(--accent);
      color: #1A1A2E;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 700;
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 12px;
      margin-bottom: 12px;
      border: 1px solid var(--border-light);
    }
    .faq-question {
      background: #F9FAFB;
      padding: 18px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      border-radius: 12px;
    }
    .faq-answer {
      padding: 0 24px 18px;
      color: var(--text-muted);
      display: none;
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    .faq-icon {
      font-size: 1.4rem;
      transition: 0.2s;
    }

    /* CTA */
    .cta-block {
      background: var(--secondary);
      color: white;
      text-align: center;
      padding: 80px 24px;
    }
    .cta-block h2 {
      font-size: 2rem;
      font-weight: 800;
    }

    /* Footer */
    .site-footer {
      background: var(--secondary);
      color: #CCCCCC;
      padding: 48px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    .footer-links a {
      display: block;
      color: #AAAAAA;
      margin: 6px 0;
    }
    .footer-links a:hover { color: white; }

    @media (max-width: 1024px) {
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .grid-4, .grid-2 { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }