/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --primary: #2C3E50;
      --primary-light: #3B5068;
      --accent: #E67E22;
      --accent-hover: #D35400;
      --black: #1A1A1A;
      --bg: #FAFAFA;
      --card-bg: #FFFFFF;
      --gray-light: #F5F6FA;
      --border: #EEEEEE;
      --text: #222;
      --text-secondary: #555;
      --text-muted: #888;
      --success: #27AE60;
      --warning: #C0392B;
      --white: #FFFFFF;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
      --shadow-md: 0 10px 25px rgba(0,0,0,0.08), 0 4px 10px rgba(0,0,0,0.04);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      --font-number: "Inter", "SF Pro Display", system-ui, sans-serif;
      --max-width: 1200px;
      --nav-height: 64px;
    }
    body {
      font-family: var(--font-sans);
      background: var(--bg);
      color: var(--text);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      font-weight: 600;
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      border-radius: var(--radius-btn);
    }
    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航栏 SaaS 命令栏风格 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(255,255,255,0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0,0,0,0.06);
      z-index: 1000;
      display: flex;
      align-items: center;
      transition: box-shadow 0.3s;
    }
    .navbar.scrolled {
      box-shadow: 0 4px 12px rgba(0,0,0,0.04);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--primary);
      letter-spacing: -0.3px;
      white-space: nowrap;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 800;
      font-size: 18px;
      position: relative;
    }
    .logo-icon::after {
      content: "▲";
      font-size: 12px;
      position: absolute;
      top: -2px;
      right: 2px;
      color: var(--accent);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      font-size: 15px;
      font-weight: 500;
      color: #555;
    }
    .nav-links a {
      padding: 6px 0;
      border-bottom: 2px solid transparent;
      transition: color 0.2s, border-color 0.2s;
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--primary);
      border-bottom-color: var(--accent);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .search-box {
      background: #f2f2f2;
      border-radius: 20px;
      padding: 6px 14px;
      font-size: 14px;
      color: #777;
      display: flex;
      align-items: center;
      gap: 6px;
      border: 1px solid transparent;
      transition: all 0.2s;
    }
    .search-box i {
      font-size: 14px;
    }
    .btn-primary-sm {
      background: var(--accent);
      color: white;
      padding: 10px 20px;
      font-size: 14px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      white-space: nowrap;
    }
    .btn-primary-sm:hover {
      background: var(--accent-hover);
      box-shadow: 0 4px 12px rgba(230,126,34,0.3);
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 22px;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
    }
    /* Hero */
    #hero {
      padding: 120px 0 80px;
      background: var(--white);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-left {
      flex: 1 1 55%;
    }
    .hero-right {
      flex: 1 1 45%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 380px;
      border-radius: 24px;
      position: relative;
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }
    .hero-right::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(44,62,80,0.05) 0%, rgba(230,126,34,0.08) 100%);
    }
    .hero-badge-group {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin: 24px 0 32px;
    }
    .badge {
      background: #f0f2f5;
      border-radius: 40px;
      padding: 8px 18px;
      font-size: 14px;
      font-weight: 600;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .badge span {
      color: var(--accent);
      font-weight: 700;
      font-family: var(--font-number);
    }
    h1 {
      font-size: clamp(2.4rem, 5vw, 3.2rem);
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.02em;
      color: var(--black);
    }
    .hero-sub {
      font-size: 1.1rem;
      color: #555;
      margin: 16px 0 8px;
      max-width: 500px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-top: 12px;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 14px 28px;
      font-weight: 600;
      border-radius: var(--radius-btn);
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      box-shadow: 0 8px 18px rgba(230,126,34,0.25);
    }
    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 28px;
      background: transparent;
    }
    .btn-outline:hover {
      background: rgba(44,62,80,0.05);
    }
    /* 亮点网格 */
    #highlights {
      padding: 90px 0;
      background: var(--gray-light);
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 600;
      margin-bottom: 48px;
      color: var(--black);
    }
    .highlight-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 24px;
    }
    .highlight-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border);
      transition: all 0.25s;
    }
    .highlight-card:hover {
      box-shadow: var(--shadow-md);
      border-color: rgba(230,126,34,0.3);
    }
    .big-number {
      font-family: var(--font-number);
      font-size: 3rem;
      font-weight: 800;
      color: var(--accent);
    }
    .highlight-icon {
      font-size: 2rem;
      color: var(--primary);
      margin-bottom: 16px;
    }
    /* 案例瀑布流 */
    #cases {
      padding: 90px 0;
    }
    .case-grid {
      columns: 3;
      column-gap: 24px;
    }
    .case-card {
      break-inside: avoid;
      background: white;
      border-radius: var(--radius-card);
      margin-bottom: 24px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border);
      transition: 0.25s;
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(230,126,34,0.25);
    }
    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }
    .case-content {
      padding: 20px;
    }
    .tag {
      background: transparent;
      border: 1px solid var(--accent);
      color: var(--accent);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 10px;
    }
    /* 方案对比 */
    #pricing {
      padding: 90px 0;
      background: var(--gray-light);
    }
    .pricing-grid {
      display: flex;
      gap: 24px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .plan-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 36px 28px;
      flex: 1 1 280px;
      max-width: 340px;
      border: 1px solid var(--border);
      display: flex;
      flex-direction: column;
      transition: 0.2s;
    }
    .plan-card.recommended {
      border: 2px solid var(--accent);
      transform: scale(1.03);
      box-shadow: var(--shadow-md);
      position: relative;
    }
    .recommend-badge {
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--accent);
      color: white;
      padding: 4px 20px;
      border-radius: 20px;
      font-weight: 700;
      font-size: 13px;
    }
    /* FAQ */
    #faq {
      padding: 90px 0;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      border: 1px solid var(--border);
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      background: white;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s;
      background: #FAFAFA;
      padding: 0 24px;
      color: #444;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 20px 24px;
    }
    /* CTA */
    #contact {
      background: var(--black);
      padding: 80px 0;
      text-align: center;
    }
    .cta-title {
      color: white;
      font-size: 2.2rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 60px 0 40px;
      color: #CCC;
    }
    @media (max-width: 1024px) {
      .highlight-grid { grid-template-columns: 1fr 1fr; }
      .case-grid { columns: 2; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links, .nav-actions .search-box { display: none; }
      .hamburger { display: flex; }
      .hero-grid { flex-direction: column; }
      .hero-right { min-height: 260px; width: 100%; }
      .highlight-grid { grid-template-columns: 1fr; }
      .case-grid { columns: 1; }
      .pricing-grid { flex-direction: column; align-items: center; }
      .plan-card.recommended { transform: none; }
    }