/* roulang page: index */
:root {
      --primary-deep: #0F172A;
      --primary-blue: #1E3A5F;
      --accent-orange: #F97316;
      --accent-orange-hover: #EA580C;
      --accent-green: #10B981;
      --text-heading: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --border-light: #E2E8F0;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 30px rgba(0,0,0,0.12);
      --shadow-xl: 0 20px 40px rgba(0,0,0,0.15);
      --radius-card: 16px;
      --radius-btn: 12px;
      --radius-input: 8px;
      --radius-badge: 999px;
      --transition: 0.2s ease-in-out;
      --font-body: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-number: "Inter", "Segoe UI", system-ui, sans-serif;
    }

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

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

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

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

    button, input, textarea {
      font-family: inherit;
    }

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

    /* 导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(10px);
      box-shadow: 0 2px 20px rgba(0,0,0,0.04);
      height: 72px;
      display: flex;
      align-items: center;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--primary-deep);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: -0.5px;
    }

    .logo-dot {
      width: 12px;
      height: 12px;
      background: var(--accent-orange);
      border-radius: 50%;
      display: inline-block;
      box-shadow: 0 0 10px rgba(249,115,22,0.4);
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-link {
      font-weight: 500;
      color: var(--text-body);
      position: relative;
      padding: 8px 0;
      transition: color var(--transition);
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-orange);
      transition: width var(--transition);
    }

    .nav-link:hover {
      color: var(--accent-orange);
    }

    .nav-link:hover::after {
      width: 100%;
    }

    .btn-primary {
      background: var(--accent-orange);
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      transition: background var(--transition), transform var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      letter-spacing: 0.3px;
    }

    .btn-primary:hover {
      background: var(--accent-orange-hover);
      transform: scale(1.02);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent-orange);
      color: var(--accent-orange);
      font-weight: 600;
      padding: 10px 28px;
      border-radius: var(--radius-btn);
      cursor: pointer;
      transition: all var(--transition);
    }

    .btn-outline:hover {
      background: var(--accent-orange);
      color: white;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
    }

    .hamburger span {
      width: 25px;
      height: 3px;
      background: var(--primary-deep);
      border-radius: 4px;
      transition: var(--transition);
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #0F172A 0%, #1E3A5F 100%);
      padding: 80px 0 100px;
      position: relative;
      overflow: hidden;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 3.2rem;
      font-weight: 700;
      color: white;
      line-height: 1.3;
      margin-bottom: 24px;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 40px;
      max-width: 90%;
    }

    .hero-badges {
      display: flex;
      gap: 16px;
      margin-top: 30px;
      flex-wrap: wrap;
    }

    .badge {
      background: var(--accent-green);
      color: white;
      font-weight: 600;
      padding: 8px 18px;
      border-radius: var(--radius-badge);
      font-size: 0.9rem;
      display: flex;
      align-items: center;
      gap: 6px;
      font-family: var(--font-number);
    }

    .badge-orange {
      background: var(--accent-orange);
    }

    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: var(--radius-card);
      height: 380px;
      box-shadow: var(--shadow-xl);
      position: relative;
    }

    .pulse-dot {
      width: 12px;
      height: 12px;
      background: var(--accent-green);
      border-radius: 50%;
      display: inline-block;
      animation: pulse 1.8s infinite;
    }

    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(16,185,129,0.5); }
      70% { box-shadow: 0 0 0 12px rgba(16,185,129,0); }
      100% { box-shadow: 0 0 0 0 rgba(16,185,129,0); }
    }

    /* 板块通用 */
    .section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--text-heading);
      margin-bottom: 16px;
      text-align: center;
    }

    .section-desc {
      color: var(--text-muted);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 60px;
      font-size: 1.1rem;
    }

    /* 指标看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .metric-card {
      background: var(--bg-white);
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }

    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .metric-number {
      font-family: var(--font-number);
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary-deep);
    }

    .metric-label {
      color: var(--text-muted);
      margin: 8px 0;
    }

    .growth {
      color: var(--accent-green);
      font-weight: 600;
      font-size: 0.9rem;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 4px;
    }

    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: var(--bg-white);
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }

    .service-icon {
      font-size: 2.5rem;
      margin-bottom: 20px;
    }

    .service-card h3 {
      font-size: 1.5rem;
      font-weight: 600;
      color: var(--text-heading);
      margin-bottom: 12px;
    }

    .service-card p {
      color: var(--text-muted);
      margin-bottom: 24px;
      flex: 1;
    }

    .text-link {
      color: var(--accent-orange);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 对比 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }

    .compare-card {
      padding: 40px;
      border-radius: var(--radius-card);
      background: var(--bg-white);
      box-shadow: var(--shadow-sm);
    }

    .compare-card.old {
      background: #F1F5F9;
    }

    .compare-card.new {
      background: #F0FDF4;
      border: 1px solid rgba(16,185,129,0.2);
    }

    .compare-list {
      list-style: none;
      margin-top: 24px;
    }

    .compare-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
    }

    /* FAQ */
    .faq-item {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }

    .faq-question {
      padding: 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      background: white;
      border: none;
      width: 100%;
      text-align: left;
      font-size: 1.1rem;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding: 0 24px;
      color: var(--text-muted);
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 24px 24px;
    }

    /* 表单 */
    .contact-form {
      background: var(--bg-white);
      padding: 48px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      max-width: 600px;
      margin: 0 auto;
    }

    .form-input {
      width: 100%;
      padding: 14px 16px;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-input);
      margin-bottom: 20px;
      font-size: 1rem;
    }

    .trust-badge {
      text-align: center;
      margin-top: 24px;
      color: var(--accent-green);
      font-weight: 600;
    }

    /* 页脚 */
    .footer {
      background: var(--primary-deep);
      color: rgba(255,255,255,0.7);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .metrics-grid { grid-template-columns: repeat(2,1fr); }
      .services-grid { grid-template-columns: 1fr 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .hero-content h1 { font-size: 2.4rem; }
      .services-grid { grid-template-columns: 1fr; }
      .compare-grid { grid-template-columns: 1fr; }
      .section { padding: 60px 0; }
    }