/* roulang page: index */
:root {
      --primary: #1A5FDC;
      --primary-dark: #0F3B8C;
      --accent: #F5A623;
      --accent-hover: #E09515;
      --bg: #F8FAFC;
      --card-bg: #FFFFFF;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --text-light: #94A3B8;
      --border: #E2E8F0;
      --footer-bg: #1E293B;
      --footer-text: #CBD5E1;
      --footer-muted: #64748B;
      --shadow-card: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
      --shadow-hover: 0 10px 25px rgba(26,95,220,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 8px;
      --transition: 0.25s cubic-bezier(0.2, 0.0, 0, 1);
      --font-sans: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-main);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3 {
      font-weight: 700;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, input, select {
      font-family: inherit;
      font-size: 16px;
    }
    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border);
      z-index: 100;
      height: 72px;
      display: flex;
      align-items: center;
      transition: var(--transition);
    }
    .header-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.3px;
    }
    .desktop-nav {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .desktop-nav a {
      font-size: 16px;
      font-weight: 500;
      color: var(--text-main);
      position: relative;
      padding: 8px 0;
      transition: color var(--transition);
    }
    .desktop-nav a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: 0.2s ease;
      transform: translateX(-50%);
    }
    .desktop-nav a:hover {
      color: var(--primary);
    }
    .desktop-nav a:hover::after {
      width: 100%;
    }
    .mobile-menu-btn {
      display: none;
      width: 48px;
      height: 48px;
      border-radius: 24px;
      background: var(--primary);
      border: none;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 5px;
      cursor: pointer;
      position: relative;
      z-index: 110;
    }
    .mobile-menu-btn span {
      display: block;
      width: 20px;
      height: 2px;
      background: white;
      transition: var(--transition);
    }
    .mobile-menu-overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(12px);
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 28px;
      z-index: 105;
      opacity: 0;
      visibility: hidden;
      transition: 0.3s ease;
    }
    .mobile-menu-overlay.active {
      opacity: 1;
      visibility: visible;
    }
    .mobile-menu-overlay a {
      font-size: 22px;
      font-weight: 600;
      color: var(--text-main);
    }
    /* Hero */
    .hero {
      padding: 140px 0 100px;
      background: var(--bg);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(248,250,252,0.85);
    }
    .hero .container {
      position: relative;
      display: flex;
      gap: 60px;
      align-items: center;
    }
    .hero-left {
      flex: 0 0 38%;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .kpi-card {
      background: var(--card-bg);
      padding: 20px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .kpi-number {
      font-size: 42px;
      font-weight: 900;
      color: var(--accent);
      line-height: 1.1;
    }
    .kpi-label {
      font-size: 16px;
      color: var(--text-muted);
      font-weight: 500;
    }
    .hero-right {
      flex: 1;
    }
    .hero-right h1 {
      font-size: 38px;
      font-weight: 800;
      line-height: 1.3;
      letter-spacing: -0.5px;
      color: var(--text-main);
      margin-bottom: 16px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
      line-height: 1.6;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn {
      display: inline-block;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
      text-align: center;
      cursor: pointer;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: var(--shadow-hover);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background: #F0F5FF;
    }
    .btn-accent {
      background: var(--accent);
      color: white;
      border: none;
      font-weight: 700;
      animation: pulse 2s infinite;
    }
    .btn-accent:hover {
      background: var(--accent-hover);
    }
    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(245,166,35,0.4); }
      70% { box-shadow: 0 0 0 10px rgba(245,166,35,0); }
      100% { box-shadow: 0 0 0 0 rgba(245,166,35,0); }
    }
    /* 通用板块 */
    .section {
      padding: 90px 0;
    }
    .section h2 {
      font-size: 30px;
      font-weight: 700;
      margin-bottom: 48px;
      text-align: center;
      color: var(--text-main);
    }
    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--card-bg);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      width: 64px;
      height: 64px;
      background: #F0F5FF;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      transition: var(--transition);
    }
    .feature-card:hover .feature-icon {
      background: var(--primary);
    }
    .feature-icon svg {
      width: 32px;
      height: 32px;
      stroke: var(--primary);
      transition: var(--transition);
    }
    .feature-card:hover .feature-icon svg {
      stroke: white;
    }
    .feature-card h3 {
      font-size: 20px;
      margin-bottom: 10px;
    }
    .feature-card p {
      color: var(--text-muted);
      font-size: 16px;
      line-height: 1.6;
    }
    /* 服务矩阵 */
    .service-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .service-row.reverse {
      flex-direction: row-reverse;
    }
    .service-text {
      flex: 1;
    }
    .service-text h3 {
      font-size: 24px;
      margin-bottom: 16px;
    }
    .service-text p {
      color: var(--text-muted);
      margin-bottom: 16px;
    }
    .service-img {
      flex: 1;
      background: #E2E8F0;
      border-radius: var(--radius-card);
      aspect-ratio: 16/9;
      background-image: url('/assets/images/coverpic/cover-2.webp');
      background-size: cover;
      background-position: center;
    }
    /* 对比 */
    .compare-wrapper {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 40px;
    }
    .compare-card {
      flex: 1;
      padding: 32px;
      border-radius: var(--radius-card);
      background: #F1F5F9;
    }
    .compare-card.after {
      background: #F0F5FF;
    }
    .compare-item {
      display: flex;
      justify-content: space-between;
      margin: 24px 0;
      font-weight: 600;
    }
    .vs-badge {
      width: 80px;
      height: 80px;
      background: linear-gradient(135deg, var(--primary), #0F3B8C);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 28px;
      font-weight: 900;
      flex-shrink: 0;
    }
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 20px 24px;
      box-shadow: var(--shadow-card);
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      cursor: pointer;
    }
    .faq-icon {
      width: 28px;
      height: 28px;
      background: var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 18px;
      transition: 0.3s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-muted);
    }
    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #F0F5FF 0%, #E8F0FE 100%);
    }
    .cta-box {
      max-width: 600px;
      margin: 0 auto;
      text-align: center;
    }
    .cta-form input, .cta-form select {
      width: 100%;
      padding: 14px 16px;
      border: 1px solid var(--border);
      border-radius: var(--radius-input);
      margin-bottom: 16px;
      background: white;
    }
    .cta-form input:focus, .cta-form select:focus {
      outline: none;
      border-color: var(--primary);
    }
    /* 页脚 */
    .footer {
      background: var(--footer-bg);
      color: var(--footer-text);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer a {
      color: var(--footer-text);
      display: block;
      margin-bottom: 10px;
    }
    .social-icons {
      display: flex;
      gap: 12px;
    }
    .social-icons span {
      width: 40px;
      height: 40px;
      border: 1px solid #475569;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .copyright {
      text-align: center;
      margin-top: 40px;
      color: var(--footer-muted);
    }
    @media (max-width: 1024px) {
      .hero .container { flex-direction: column; }
      .features-grid { grid-template-columns: repeat(2, 1fr); }
      .service-row { flex-direction: column; }
      .service-row.reverse { flex-direction: column; }
    }
    @media (max-width: 768px) {
      .desktop-nav { display: none; }
      .mobile-menu-btn { display: flex; }
      .features-grid { grid-template-columns: 1fr; }
      .compare-wrapper { flex-direction: column; }
      .faq-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero-right h1 { font-size: 30px; }
    }