/* roulang page: index */
/* 自定义CSS变量与深度定制 */
    :root {
      --primary-deep: #0A1F3F;
      --primary-mid: #1B4F8A;
      --accent: #F9A826;
      --bg-light: #F7F9FC;
      --card-white: #FFFFFF;
      --text-dark: #1A2B3C;
      --text-body: #334455;
      --text-muted: #5F6B7A;
      --border-light: rgba(10,31,63,0.08);
      --shadow-sm: 0 8px 30px rgba(10,31,63,0.06);
      --shadow-md: 0 16px 40px rgba(10,31,63,0.12);
      --radius-card: 20px;
      --radius-btn: 50px;
      --radius-badge: 12px;
      --font-mono: 'Fira Code', 'JetBrains Mono', 'Courier New', monospace;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
      --transition: all 0.25s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 导航 */
    .nav-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255,255,255,0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      transition: var(--transition);
      box-shadow: 0 4px 20px rgba(0,0,0,0.02);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--primary-deep);
      text-decoration: none;
      letter-spacing: 0.5px;
    }

    .logo-icon {
      font-size: 2rem;
      color: var(--accent);
      transform: rotate(-8deg);
      filter: drop-shadow(0 4px 6px rgba(249,168,38,0.3));
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2.2rem;
      list-style: none;
    }

    .nav-links a {
      text-decoration: none;
      color: var(--primary-deep);
      font-weight: 500;
      font-size: 1rem;
      padding: 8px 0;
      position: relative;
      transition: color 0.2s;
      white-space: nowrap;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 3px;
      background: linear-gradient(90deg, var(--primary-mid), var(--accent));
      border-radius: 3px;
      transition: width 0.2s ease;
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .nav-links a.active {
      color: var(--accent);
      font-weight: 600;
    }

    .btn-nav-cta {
      background: linear-gradient(135deg, var(--accent), #E59400);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      box-shadow: 0 8px 18px rgba(249,168,38,0.25);
      transition: var(--transition);
      border: none;
      cursor: pointer;
      display: inline-block;
      line-height: 1.2;
    }

    .btn-nav-cta:hover {
      transform: scale(1.04);
      box-shadow: 0 12px 24px rgba(249,168,38,0.35);
    }

    /* 移动菜单图标 */
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary-deep);
      cursor: pointer;
    }

    /* 板块通用 */
    section {
      padding: 70px 0;
    }

    /* Hero */
    .hero {
      background: linear-gradient(145deg, #0A1F3F 0%, #1B4F8A 100%);
      position: relative;
      overflow: hidden;
      padding: 90px 0 80px;
      color: white;
    }

    .hero::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: 
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
      background-size: 40px 40px;
      pointer-events: none;
      z-index: 1;
    }

    .hero .container {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      gap: 40px;
      flex-wrap: wrap;
    }

    .hero-content {
      flex: 1 1 500px;
    }

    .hero h1 {
      font-size: clamp(2.4rem, 6vw, 3.4rem);
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.5rem;
      color: white;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 2rem;
      max-width: 500px;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--accent), #E08B00);
      color: #0A1F3F;
      font-weight: 700;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      display: inline-block;
      box-shadow: 0 12px 25px rgba(249,168,38,0.4);
      transition: var(--transition);
      border: none;
      cursor: pointer;
      margin-right: 18px;
      font-size: 1.05rem;
    }

    .btn-primary:hover {
      transform: scale(1.04);
      box-shadow: 0 18px 32px rgba(249,168,38,0.55);
      filter: brightness(1.05);
    }

    .btn-outline-light {
      background: transparent;
      border: 2px solid rgba(255,255,255,0.5);
      color: white;
      font-weight: 600;
      padding: 12px 30px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      transition: var(--transition);
      display: inline-block;
    }

    .btn-outline-light:hover {
      background: rgba(255,255,255,0.12);
      border-color: white;
    }

    .hero-visual {
      flex: 1 1 400px;
      position: relative;
    }

    .hero-img-card {
      background: var(--card-white);
      border-radius: 28px;
      overflow: hidden;
      box-shadow: 0 30px 50px rgba(0,0,0,0.5);
      transform: rotate(2deg);
      transition: var(--transition);
    }

    .hero-img-card img {
      width: 100%;
      height: auto;
      display: block;
    }

    /* 数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      margin-top: -30px;
      position: relative;
      z-index: 5;
    }

    .stat-card {
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      border: 1px solid rgba(255,255,255,0.5);
      transition: var(--transition);
    }

    .stat-number {
      font-family: var(--font-mono);
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary-deep);
      background: linear-gradient(135deg, #0A1F3F, #1B4F8A);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 8px;
    }

    .stat-label {
      color: var(--text-muted);
      font-weight: 500;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      font-size: 0.9rem;
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
      margin-top: 40px;
    }

    .service-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border: 1px solid transparent;
    }

    .service-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-md);
      border-color: rgba(249,168,38,0.25);
    }

    .service-icon {
      font-size: 2.4rem;
      color: var(--accent);
      margin-bottom: 18px;
    }

    .service-card h3 {
      font-size: 1.4rem;
      font-weight: 700;
      color: var(--primary-deep);
      margin-bottom: 10px;
    }

    /* 案例对比 */
    .compare-wrapper {
      display: flex;
      align-items: center;
      gap: 30px;
      flex-wrap: wrap;
      margin-top: 30px;
    }

    .compare-card {
      flex: 1 1 280px;
      background: white;
      border-radius: var(--radius-card);
      padding: 30px;
      box-shadow: var(--shadow-sm);
    }

    .compare-card.traditional {
      background: #f0f2f5;
      color: #5F6B7A;
    }

    .compare-card.mk {
      background: linear-gradient(135deg, #0A1F3F, #1B4F8A);
      color: white;
      border: 1px solid rgba(255,255,255,0.2);
    }

    .vs-divider {
      font-size: 2rem;
      font-weight: 800;
      color: var(--accent);
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 40px auto 0;
    }

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

    .faq-question {
      padding: 20px 24px;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: white;
      border: none;
      width: 100%;
      font-size: 1.1rem;
      color: var(--primary-deep);
    }

    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-body);
      display: none;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA表单 */
    .cta-section {
      background: linear-gradient(135deg, #0A1F3F, #1B4F8A);
      border-radius: 40px;
      padding: 60px 50px;
      display: flex;
      gap: 50px;
      flex-wrap: wrap;
      align-items: center;
      margin: 40px 0;
    }

    .cta-left {
      flex: 1;
      color: white;
    }

    .cta-form {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .cta-form input {
      padding: 14px 18px;
      border-radius: 16px;
      border: none;
      background: rgba(255,255,255,0.15);
      color: white;
      font-size: 1rem;
    }

    .cta-form input::placeholder {
      color: rgba(255,255,255,0.6);
    }

    .btn-submit {
      background: var(--accent);
      border: none;
      font-weight: 700;
      padding: 16px;
      border-radius: 50px;
      cursor: pointer;
    }

    /* 页脚 */
    .footer {
      background: #0A1F3F;
      color: #B0C4DE;
      padding: 60px 0 30px;
    }

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

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-toggle { display: block; }
      .hero .container { flex-direction: column; }
      .dashboard-grid, .services-grid { grid-template-columns: 1fr; }
      .compare-wrapper { flex-direction: column; }
      .cta-section { flex-direction: column; }
    }