/* roulang page: index */
:root {
      --primary: #0B8A3F;
      --primary-hover: #097A35;
      --accent: #F5A623;
      --accent-hover: #E09615;
      --dark-bg: #1A1D23;
      --light-bg: #F7F8F9;
      --card-bg: #FFFFFF;
      --text-main: #2C2F33;
      --text-muted: #6B7280;
      --border-color: #E5E7EB;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 24px rgba(11,138,63,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-mono: "DIN Alternate", "Roboto Mono", "Menlo", monospace;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --transition: all 0.25s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--light-bg);
      color: var(--text-main);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }

    a { text-decoration: none; color: inherit; transition: var(--transition); }
    img { max-width: 100%; height: auto; display: block; }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 按钮体系 */
    .btn {
      display: inline-block;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      text-align: center;
      cursor: pointer;
      transition: var(--transition);
      border: none;
      font-size: 16px;
    }
    .btn-primary {
      background: var(--primary);
      color: #fff;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-1px);
      box-shadow: 0 4px 12px rgba(11,138,63,0.3);
      color: #fff;
    }
    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: #fff;
      transform: translateY(-1px);
    }
    .btn-accent {
      background: var(--accent);
      color: #1A1D23;
      font-weight: 700;
    }
    .btn-accent:hover {
      background: var(--accent-hover);
      transform: translateY(-1px);
      box-shadow: 0 4px 12px rgba(245,166,35,0.4);
      color: #1A1D23;
    }

    /* 导航栏 */
    .site-header {
      background: #fff;
      box-shadow: 0 1px 4px rgba(0,0,0,0.04);
      position: sticky;
      top: 0;
      z-index: 50;
      padding: 12px 0;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }
    .logo {
      font-weight: 700;
      font-size: 22px;
      color: var(--primary);
      display: flex;
      align-items: baseline;
      gap: 4px;
    }
    .logo span {
      font-size: 14px;
      font-weight: 400;
      color: var(--text-muted);
    }
    .nav-links {
      display: flex;
      gap: 28px;
      list-style: none;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-main);
      font-size: 15px;
    }
    .nav-links a:hover { color: var(--primary); }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .search-icon {
      cursor: pointer;
      color: var(--text-muted);
      font-size: 18px;
    }
    .search-icon:hover { color: var(--primary); }
    .login-link {
      color: var(--text-main);
      font-weight: 500;
    }
    .hamburger {
      display: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--text-main);
    }

    /* Hero 双栏 */
    .hero {
      padding: 60px 0 70px;
      background: var(--light-bg);
      position: relative;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 7fr 5fr;
      gap: 40px;
      align-items: center;
    }
    .hero-left .tag {
      display: inline-block;
      background: rgba(245,166,35,0.15);
      color: var(--accent);
      font-weight: 600;
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 14px;
      margin-bottom: 16px;
    }
    .hero-left h1 {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 16px;
      color: #1A1D23;
    }
    .hero-subtitle {
      font-size: 16px;
      color: var(--text-muted);
      margin-bottom: 28px;
      max-width: 90%;
    }
    .hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
    .hero-right {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }
    .stat-card {
      background: #fff;
      border-radius: var(--radius-card);
      padding: 20px 16px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
      transition: var(--transition);
    }
    .stat-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-hover);
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 32px;
      font-weight: 700;
      color: var(--accent);
      display: block;
    }
    .stat-label {
      font-size: 14px;
      color: var(--text-muted);
      margin-top: 6px;
    }

    /* 区块标题 */
    .section-title {
      font-size: 28px;
      font-weight: 700;
      margin-bottom: 8px;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 50px;
      height: 4px;
      background: var(--accent);
      margin-top: 8px;
      border-radius: 2px;
    }
    .section-header { margin-bottom: 40px; text-align: center; }
    .section-header p { color: var(--text-muted); }

    /* 核心优势 不对称网格 */
    .features-grid {
      display: grid;
      grid-template-columns: 5fr 4fr 3fr;
      gap: 24px;
    }
    .feature-item {
      background: #fff;
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
      transition: var(--transition);
    }
    .feature-item:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      font-size: 32px;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .feature-item h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 10px;
    }
    .feature-desc {
      color: var(--text-muted);
      font-size: 15px;
      margin-bottom: 12px;
    }
    .feature-stat {
      font-family: var(--font-mono);
      font-weight: 700;
      color: var(--primary);
      font-size: 24px;
    }

    /* 瀑布流服务卡片 */
    .services-masonry {
      column-count: 3;
      column-gap: 20px;
    }
    .service-card {
      background: #fff;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
      margin-bottom: 20px;
      break-inside: avoid;
      transition: var(--transition);
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary);
    }
    .service-card img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
    }
    .service-body {
      padding: 20px;
    }
    .service-body h3 {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .service-body p {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 12px;
    }
    .tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }
    .tag-badge {
      background: #f0f4f1;
      color: var(--primary);
      font-size: 12px;
      padding: 4px 10px;
      border-radius: 20px;
    }

    /* 方案对比 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 0;
      background: #fff;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .compare-col {
      padding: 32px 28px;
      display: flex;
      flex-direction: column;
    }
    .compare-header {
      background: var(--dark-bg);
      color: #fff;
      padding: 24px;
      text-align: center;
    }
    .compare-header h3 {
      font-size: 22px;
      margin-bottom: 8px;
    }
    .price {
      font-family: var(--font-mono);
      font-size: 28px;
      font-weight: 700;
      color: var(--accent);
    }
    .feature-list {
      list-style: none;
      margin: 24px 0;
      flex: 1;
    }
    .feature-list li {
      padding: 10px 0;
      border-bottom: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .check { color: var(--primary); }
    .cross { color: #ccc; }

    /* FAQ */
    .accordion-item {
      background: #fff;
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
    }
    .accordion-title {
      font-weight: 600;
      font-size: 18px;
      padding: 18px 24px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .accordion-content {
      padding: 0 24px 18px;
      color: var(--text-muted);
      display: none;
    }
    .accordion-item.active .accordion-content { display: block; }
    .accordion-icon {
      background: var(--accent);
      color: #fff;
      width: 24px;
      height: 24px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    /* CTA */
    .cta-section {
      background: var(--dark-bg);
      padding: 70px 0;
      text-align: center;
      color: #fff;
    }
    .cta-section h2 {
      font-size: 28px;
      margin-bottom: 12px;
    }
    .cta-form {
      display: flex;
      gap: 12px;
      justify-content: center;
      flex-wrap: wrap;
      margin-top: 30px;
    }
    .cta-form input {
      padding: 12px 16px;
      border-radius: var(--radius-input);
      border: 1px solid #555;
      background: #2a2d33;
      color: #fff;
      min-width: 200px;
    }
    .cta-form input:focus {
      border-color: var(--accent);
      outline: none;
    }

    /* 页脚 */
    .site-footer {
      background: #14161a;
      color: #9CA3AF;
      padding: 50px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1.5fr;
      gap: 40px;
    }
    .footer-links a {
      display: block;
      color: #9CA3AF;
      margin-bottom: 8px;
    }
    .footer-links a:hover { color: #fff; }
    .copyright {
      text-align: center;
      margin-top: 40px;
      font-size: 14px;
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .features-grid { grid-template-columns: 1fr 1fr; }
      .services-masonry { column-count: 2; }
      .compare-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links, .nav-actions .login-link, .nav-actions .btn { display: none; }
      .hamburger { display: block; }
      .features-grid { grid-template-columns: 1fr; }
      .services-masonry { column-count: 1; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero-left h1 { font-size: 28px; }
    }