/* roulang page: index */
:root {
      --deep-blue: #0A2E5C;
      --deep-blue-dark: #0B3B6B;
      --cta-green: #00C896;
      --cta-green-hover: #00A87D;
      --warm-bg: #F4F6F9;
      --card-white: #FFFFFF;
      --text-dark: #1A1A1A;
      --text-mid: #5A5A5A;
      --text-light: #8A8A8A;
      --border-light: #e0e5ec;
      --radius-card: 16px;
      --radius-btn: 40px;
      --shadow-card: 0 10px 30px rgba(0,0,0,0.06);
      --shadow-hover: 0 20px 40px rgba(0,0,0,0.12);
      --transition: all 0.3s ease;
      --font-stack: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-stack);
      background-color: var(--warm-bg);
      color: var(--text-dark);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .top-bar-custom {
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 16px rgba(0,0,0,0.04);
      padding: 0.85rem 0;
      position: fixed;
      width: 100%;
      top: 0;
      z-index: 100;
      transition: var(--transition);
    }
    .nav-logo {
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--deep-blue);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 0.3rem;
    }
    .nav-logo i {
      color: var(--cta-green);
      font-size: 2rem;
    }
    .nav-links a {
      color: var(--text-mid);
      font-weight: 500;
      font-size: 0.95rem;
      margin: 0 0.6rem;
      padding: 0.4rem 0.7rem;
      border-radius: 30px;
      transition: var(--transition);
      text-decoration: none;
    }
    .nav-links a:hover {
      color: var(--cta-green);
      background: rgba(0,200,150,0.08);
    }
    .cta-btn-nav {
      background: var(--cta-green);
      color: white !important;
      font-weight: 600;
      padding: 0.6rem 1.8rem;
      border-radius: var(--radius-btn);
      box-shadow: 0 8px 18px rgba(0,200,150,0.25);
      transition: var(--transition);
      letter-spacing: 0.5px;
    }
    .cta-btn-nav:hover {
      background: var(--cta-green-hover);
      box-shadow: 0 12px 24px rgba(0,200,150,0.35);
      transform: translateY(-1px);
    }
    .menu-icon-dark::after {
      background: var(--deep-blue);
      box-shadow: 0 7px 0 var(--deep-blue), 0 14px 0 var(--deep-blue);
    }
    /* 汉堡菜单定制 */
    .is-drilldown {
      background: white;
    }
    @media (max-width: 639px) {
      .nav-links {
        display: none;
      }
      .top-bar-custom .container {
        justify-content: space-between;
      }
      .cta-mobile-hide {
        display: none;
      }
    }
    /* Hero */
    .hero-section {
      background: linear-gradient(135deg, #0A2E5C 0%, #0C3D6E 100%);
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding: 120px 0 80px;
      margin-top: 0;
    }
    .hero-bg-overlay {
      position: absolute;
      inset: 0;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.25;
      mix-blend-mode: overlay;
    }
    .hero-content {
      position: relative;
      z-index: 2;
    }
    .hero-title {
      font-size: 3.5rem;
      font-weight: 700;
      color: white;
      line-height: 1.2;
      margin-bottom: 1.5rem;
      letter-spacing: -0.5px;
    }
    .hero-sub {
      font-size: 1.25rem;
      color: rgba(255,255,255,0.85);
      max-width: 650px;
      margin-bottom: 2.2rem;
      line-height: 1.7;
    }
    .hero-cta-btn {
      background: var(--cta-green);
      color: white;
      font-weight: 700;
      padding: 1rem 2.5rem;
      font-size: 1.2rem;
      border-radius: var(--radius-btn);
      display: inline-block;
      transition: var(--transition);
      box-shadow: 0 15px 30px rgba(0,200,150,0.4);
      border: none;
      text-decoration: none;
    }
    .hero-cta-btn:hover {
      background: var(--cta-green-hover);
      transform: translateY(-3px);
      box-shadow: 0 20px 40px rgba(0,200,150,0.5);
      color: white;
    }
    .hero-image-placeholder {
      background: rgba(255,255,255,0.08);
      border-radius: 24px;
      padding: 10px;
      backdrop-filter: blur(6px);
    }
    .hero-image-placeholder img {
      border-radius: 16px;
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    /* 通用板块 */
    section {
      padding: 90px 0;
    }
    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--deep-blue);
      margin-bottom: 0.8rem;
      text-align: center;
    }
    .section-subtitle {
      color: var(--text-mid);
      text-align: center;
      max-width: 650px;
      margin: 0 auto 50px;
      font-size: 1.1rem;
    }
    /* 卡片 */
    .feature-card, .product-card, .scenario-card, .case-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 2rem 1.8rem;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      height: 100%;
      border: 1px solid rgba(0,0,0,0.02);
    }
    .feature-card:hover, .product-card:hover, .scenario-card:hover, .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .icon-circle {
      width: 64px;
      height: 64px;
      background: rgba(10,46,92,0.06);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 1.5rem;
      font-size: 2rem;
      color: var(--deep-blue);
    }
    h3.card-title {
      font-size: 1.4rem;
      font-weight: 600;
      margin-bottom: 0.8rem;
      color: var(--text-dark);
    }
    .card-desc {
      color: var(--text-mid);
      line-height: 1.6;
      font-size: 0.98rem;
    }
    /* 产品交替区块 */
    .alt-row {
      display: flex;
      align-items: center;
      gap: 40px;
      margin-bottom: 70px;
      flex-wrap: wrap;
    }
    .alt-text {
      flex: 1 1 400px;
    }
    .alt-img {
      flex: 1 1 400px;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 20px 35px rgba(0,0,0,0.08);
    }
    .alt-img img {
      width: 100%;
      height: auto;
      display: block;
    }
    /* FAQ */
    .accordion-item {
      background: white;
      border-radius: 12px;
      margin-bottom: 16px;
      box-shadow: 0 6px 18px rgba(0,0,0,0.04);
      border: 1px solid var(--border-light);
    }
    .accordion-title {
      font-weight: 600;
      color: var(--deep-blue);
      font-size: 1.1rem;
      padding: 1.2rem 1.8rem;
      border-radius: 12px;
      background: white;
      transition: 0.2s;
    }
    .accordion-title:hover {
      background: #f8fafd;
    }
    .accordion-content {
      padding: 0 1.8rem 1.4rem;
      color: var(--text-mid);
      border-top: 1px solid #edf2f7;
    }
    /* 最终CTA */
    .final-cta {
      background: var(--deep-blue);
      padding: 90px 0;
      text-align: center;
    }
    .final-cta h2 {
      color: white;
      font-weight: 700;
      font-size: 2.5rem;
      margin-bottom: 1rem;
    }
    .footer {
      background: #1A1A1A;
      color: #ccc;
      padding: 60px 0 30px;
    }
    .footer a {
      color: #bbb;
      text-decoration: none;
    }
    .footer a:hover {
      color: var(--cta-green);
    }
    .back-to-top {
      color: var(--cta-green);
      font-weight: 600;
    }
    @media (max-width: 1024px) {
      .hero-title { font-size: 2.8rem; }
    }
    @media (max-width: 640px) {
      .hero-title { font-size: 2.2rem; }
      section { padding: 60px 0; }
      .section-title { font-size: 2rem; }
      .alt-row { flex-direction: column; }
    }