/* roulang page: index */
:root {
      --primary: #E8452D;
      --primary-dark: #C0392B;
      --secondary: #1B1B2F;
      --accent: #F9A826;
      --bg: #F5F5F7;
      --card: #FFFFFF;
      --text: #1B1B2F;
      --text-light: #4A4A5A;
      --white: #FFFFFF;
      --border: #E8E8EC;
      --shadow: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --transition: 0.25s ease;
      --font-heading: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-body: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-data: "DIN Alternate", "SF Mono", "Menlo", monospace;
    }
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
      font-family: var(--font-body);
      background-color: 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; transition: var(--transition); }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    @media (max-width: 768px) {
      .container { padding: 0 16px; }
    }
    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(10px);
      box-shadow: 0 1px 0 var(--border);
      z-index: 1000;
      height: 72px;
      display: flex;
      align-items: center;
    }
    .nav .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 800;
      font-size: 22px;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .logo img {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      object-fit: cover;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text);
      font-size: 15px;
      padding: 6px 0;
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .btn-nav {
      background: linear-gradient(135deg, #E8452D, #F9A826);
      color: white !important;
      padding: 10px 20px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 14px;
      box-shadow: 0 2px 8px rgba(232,69,45,0.25);
    }
    .btn-nav:hover {
      transform: scale(1.03);
      box-shadow: 0 4px 15px rgba(232,69,45,0.4);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--text);
      cursor: pointer;
    }
    /* 移动端导航遮罩 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: var(--secondary);
      z-index: 999;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 32px;
    }
    .mobile-menu a {
      color: white;
      font-size: 20px;
      font-weight: 600;
    }
    .mobile-menu .close-btn {
      position: absolute;
      top: 20px;
      right: 20px;
      background: none;
      border: none;
      color: white;
      font-size: 36px;
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-toggle { display: block; }
      .nav { height: 56px; }
    }
    /* 板块通用 */
    section {
      padding: 80px 0;
    }
    @media (max-width: 768px) {
      section { padding: 60px 0; }
    }
    h2 {
      font-family: var(--font-heading);
      font-size: 38px;
      font-weight: 700;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }
    @media (max-width: 768px) {
      h2 { font-size: 28px; }
    }
    .section-sub {
      color: var(--text-light);
      font-size: 16px;
      margin-bottom: 48px;
    }
    /* Hero */
    .hero {
      padding-top: 120px;
      background: linear-gradient(135deg, #1B1B2F 0%, #2A2A40 100%);
      position: relative;
      overflow: hidden;
      color: white;
    }
    .hero::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 30% 40%, rgba(232,69,45,0.25), transparent 70%);
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 48px;
      position: relative;
      z-index: 2;
    }
    .hero-content {
      flex: 1 1 50%;
    }
    .hero h1 {
      font-family: var(--font-heading);
      font-size: 52px;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-desc {
      font-size: 18px;
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
    }
    .badge-group {
      display: flex;
      gap: 16px;
      margin-bottom: 32px;
      flex-wrap: wrap;
    }
    .badge {
      background: rgba(255,255,255,0.12);
      backdrop-filter: blur(4px);
      border-radius: 12px;
      padding: 14px 18px;
      text-align: center;
      min-width: 100px;
    }
    .badge .num {
      font-family: var(--font-data);
      font-size: 28px;
      font-weight: 700;
      color: var(--accent);
    }
    .badge .label {
      font-size: 13px;
      color: rgba(255,255,255,0.7);
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, #E8452D, #F9A826);
      color: white;
      padding: 14px 32px;
      border-radius: 8px;
      font-weight: 600;
      font-size: 16px;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      border: none;
      cursor: pointer;
      transition: 0.25s ease;
      box-shadow: 0 4px 12px rgba(232,69,45,0.3);
    }
    .btn-primary:hover {
      transform: scale(1.03);
      box-shadow: 0 8px 20px rgba(232,69,45,0.5);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: 8px;
      font-weight: 600;
      font-size: 16px;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: 0.25s;
    }
    .btn-outline:hover {
      background: rgba(232,69,45,0.15);
    }
    .hero-image {
      flex: 1 1 50%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      min-height: 360px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    }
    @media (max-width: 768px) {
      .hero .container { flex-direction: column; }
      .hero h1 { font-size: 34px; }
      .hero-image { width: 100%; min-height: 240px; }
      .badge-group { justify-content: center; }
    }
    /* 指标看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 32px;
    }
    .metric-card {
      background: var(--card);
      border-radius: var(--radius-lg);
      padding: 28px 20px;
      box-shadow: var(--shadow);
      text-align: center;
      transition: var(--transition);
    }
    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .metric-num {
      font-family: var(--font-data);
      font-size: 36px;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 8px;
    }
    .metric-label {
      font-size: 15px;
      color: var(--text-light);
      font-weight: 500;
    }
    .trend-up { color: #2ECC71; margin-left: 4px; }
    @media (max-width: 992px) {
      .metrics-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 520px) {
      .metrics-grid { grid-template-columns: 1fr; }
    }
    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 32px;
    }
    .service-card {
      background: var(--card);
      border-radius: var(--radius-lg);
      padding: 30px 24px;
      box-shadow: var(--shadow);
      position: relative;
      transition: var(--transition);
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .service-icon {
      width: 64px;
      height: 64px;
      background: #FFF0ED;
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      font-size: 28px;
    }
    .service-card h3 {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 12px;
    }
    .service-desc {
      color: var(--text-light);
      font-size: 15px;
      margin-bottom: 16px;
    }
    .data-badge {
      position: absolute;
      top: 20px;
      right: 20px;
      background: var(--accent);
      color: #1B1B2F;
      font-size: 13px;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: 20px;
    }
    .more-link {
      color: var(--primary);
      font-weight: 600;
      font-size: 15px;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    .more-link:hover { gap: 8px; }
    @media (max-width: 992px) {
      .services-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 600px) {
      .services-grid { grid-template-columns: 1fr; }
    }
    /* 对比表 */
    .compare-table {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-top: 32px;
    }
    .plan-card {
      background: var(--card);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      box-shadow: var(--shadow);
      text-align: center;
      border: 2px solid transparent;
    }
    .plan-card.featured {
      border-color: var(--accent);
      position: relative;
    }
    .popular-badge {
      background: var(--accent);
      color: #1B1B2F;
      font-weight: 700;
      font-size: 13px;
      padding: 6px 16px;
      border-radius: 20px;
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
    }
    .plan-name {
      font-size: 22px;
      font-weight: 700;
      margin: 16px 0 8px;
    }
    .plan-price {
      font-family: var(--font-data);
      font-size: 28px;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .feature-list {
      list-style: none;
      text-align: left;
      margin-bottom: 24px;
    }
    .feature-list li {
      padding: 8px 0;
      font-size: 15px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .check { color: #2ECC71; font-weight: bold; }
    .cross { color: #ccc; }
    @media (max-width: 768px) {
      .compare-table { grid-template-columns: 1fr; }
    }
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-top: 32px;
    }
    .faq-item {
      background: var(--card);
      border-radius: var(--radius-md);
      padding: 20px;
      box-shadow: var(--shadow);
    }
    .faq-question {
      font-weight: 700;
      font-size: 18px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-light);
      font-size: 15px;
      margin-top: 0;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      margin-top: 10px;
    }
    @media (max-width: 768px) {
      .faq-grid { grid-template-columns: 1fr; }
    }
    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #E8452D, #F9A826);
      color: white;
    }
    .cta-box {
      background: white;
      border-radius: 24px;
      padding: 40px;
      max-width: 600px;
      margin: 0 auto;
      color: var(--text);
    }
    .form-group {
      margin-bottom: 20px;
    }
    input, select, textarea {
      width: 100%;
      padding: 14px 16px;
      border: 1px solid #ddd;
      border-radius: 8px;
      font-size: 16px;
      font-family: inherit;
    }
    .submit-btn {
      background: var(--secondary);
      color: white;
      border: none;
      padding: 16px;
      width: 100%;
      border-radius: 8px;
      font-weight: 700;
      font-size: 16px;
      cursor: pointer;
      transition: 0.2s;
    }
    .submit-btn:hover { background: #2A2A45; }
    /* 页脚 */
    .footer {
      background: var(--secondary);
      color: #B0B0C0;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-logo {
      font-size: 24px;
      font-weight: 800;
      color: white;
      margin-bottom: 12px;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr; }
    }