/* roulang page: index */
:root {
      --primary: #D32F2F;
      --primary-dark: #B71C1C;
      --secondary: #1A1A2E;
      --accent: #F5A623;
      --accent-light: rgba(245, 166, 35, 0.12);
      --bg-light: #F9F9F9;
      --bg-dark: #1A1A2E;
      --highlight: #00C9A7;
      --highlight-bg: rgba(0, 201, 167, 0.08);
      --text-main: #1A1A2E;
      --text-secondary: #5A5A6E;
      --text-on-dark: #FFFFFF;
      --border-light: rgba(0, 0, 0, 0.05);
      --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.04);
      --shadow-default: 0 8px 24px rgba(0, 0, 0, 0.06);
      --shadow-hover: 0 14px 32px rgba(0, 0, 0, 0.10);
      --gradient-cta: linear-gradient(135deg, #D32F2F 0%, #F5A623 100%);
      --radius-card: 16px;
      --radius-btn: 50px;
      --radius-tag: 50px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      --font-number: "Inter", "Roboto", system-ui, sans-serif;
      --transition: 0.2s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }

    /* 导航 */
    .header {
      position: sticky;
      top: 0;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(10px);
      z-index: 50;
      border-bottom: 1px solid var(--border-light);
      transition: box-shadow var(--transition);
    }

    .header.scrolled {
      box-shadow: var(--shadow-default);
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--primary);
      letter-spacing: -0.3px;
    }

    .logo-icon {
      font-size: 1.8rem;
      filter: drop-shadow(0 2px 4px rgba(211, 47, 47, 0.3));
    }

    .nav-links {
      display: flex;
      gap: 2rem;
      font-weight: 500;
      color: var(--text-secondary);
    }

    .nav-links a {
      position: relative;
      padding: 6px 0;
      transition: color var(--transition);
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }

    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--gradient-cta);
      border-radius: 3px;
    }

    .nav-cta {
      background: var(--gradient-cta);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      transition: transform 0.2s, box-shadow 0.2s;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .nav-cta:hover {
      transform: scale(1.03);
      box-shadow: 0 8px 18px rgba(211, 47, 47, 0.3);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 2rem;
      color: var(--primary);
    }

    @media (max-width: 768px) {
      .nav-links, .nav-cta.desktop {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .mobile-menu {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 1.5rem;
        box-shadow: var(--shadow-default);
        display: none;
        z-index: 40;
      }
      .mobile-menu.open {
        display: flex;
      }
    }

    /* 板块间距 */
    section {
      padding: 80px 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }

    .section-title {
      display: flex;
      align-items: center;
      gap: 16px;
      margin-bottom: 48px;
      font-weight: 700;
      font-size: 2.2rem;
      letter-spacing: -0.5px;
    }

    .section-title::before {
      content: '';
      display: inline-block;
      width: 6px;
      height: 40px;
      background: var(--gradient-cta);
      border-radius: 6px;
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--gradient-cta);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: all 0.2s;
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 22px rgba(211, 47, 47, 0.35);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.2s;
    }

    .btn-outline:hover {
      background: rgba(211, 47, 47, 0.06);
    }

    /* Hero */
    .hero {
      display: flex;
      align-items: center;
      gap: 3rem;
      background: url('/assets/images/backpic/back-1.webp') no-repeat center/cover;
      background-blend-mode: overlay;
      background-color: rgba(249,249,249,0.92);
      border-radius: 32px;
      padding: 2rem 2.5rem;
      margin-top: 20px;
    }

    .hero-left {
      flex: 1;
    }

    .hero-left h1 {
      font-size: 3.2rem;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 1.2rem;
      color: var(--secondary);
    }

    .hero-left .highlight {
      color: var(--primary);
    }

    .hero-desc {
      font-size: 1.1rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
    }

    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .hero-right {
      flex: 1;
      position: relative;
    }

    .hero-right img {
      border-radius: 24px;
      box-shadow: var(--shadow-default);
    }

    .hero-badge {
      position: absolute;
      bottom: 12px;
      left: 12px;
      background: rgba(26,26,46,0.85);
      backdrop-filter: blur(8px);
      color: white;
      padding: 8px 18px;
      border-radius: 40px;
      font-weight: 600;
      font-size: 0.9rem;
    }

    @media (max-width: 768px) {
      .hero {
        flex-direction: column;
        padding: 1.5rem;
      }
      .hero-left h1 {
        font-size: 2.2rem;
      }
    }

    /* 亮点网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: white;
      padding: 28px 20px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: all 0.25s;
      border: 1px solid var(--border-light);
      text-align: center;
    }

    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: var(--accent);
    }

    .feature-icon {
      font-size: 2.5rem;
      margin-bottom: 16px;
    }

    @media (max-width: 768px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 案例瀑布流 */
    .case-grid {
      columns: 2;
      column-gap: 20px;
    }

    .case-item {
      break-inside: avoid;
      margin-bottom: 20px;
      border-radius: 20px;
      overflow: hidden;
      position: relative;
      transition: transform 0.2s;
    }

    .case-item img {
      width: 100%;
      object-fit: cover;
      transition: 0.2s;
    }

    .case-item:hover img {
      transform: scale(1.03);
    }

    .case-info {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(transparent, rgba(0,0,0,0.7));
      color: white;
      padding: 20px;
      font-weight: 600;
    }

    @media (max-width: 768px) {
      .case-grid {
        columns: 1;
      }
    }

    /* 对比表 */
    .compare-table {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }

    .plan-card {
      background: white;
      border-radius: 20px;
      padding: 2rem;
      box-shadow: var(--shadow-sm);
    }

    .plan-card.recommended {
      border-left: 5px solid var(--highlight);
      background: var(--highlight-bg);
    }

    @media (max-width: 768px) {
      .compare-table {
        grid-template-columns: 1fr;
      }
    }

    /* 数据带 */
    .stats-band {
      background: var(--bg-dark);
      color: white;
      display: flex;
      justify-content: space-around;
      text-align: center;
      padding: 3rem 1rem;
      border-radius: 28px;
    }

    .stat-number {
      font-family: var(--font-number);
      font-size: 3rem;
      font-weight: 700;
      color: var(--accent);
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 16px;
      margin-bottom: 12px;
      padding: 1.2rem 1.5rem;
      border-left: 4px solid var(--primary);
      cursor: pointer;
    }

    /* CTA 横幅 */
    .cta-band {
      background: var(--bg-dark);
      border-radius: 32px;
      padding: 3rem;
      text-align: center;
      color: white;
    }

    /* 页脚 */
    .footer {
      background: var(--bg-dark);
      color: #ccc;
      padding: 3rem 0 1.5rem;
    }