/* roulang page: index */
:root {
      --deep-indigo: #0B1A3A;
      --starlight-silver: #E8EEF2;
      --gold-accent: #F59E0B;
      --gold-hover: #FBBF24;
      --card-bg: #FFFFFF;
      --light-bg: #F8FAFC;
      --text-primary: #1E293B;
      --text-secondary: #64748B;
      --border-light: rgba(232, 238, 242, 0.3);
      --bs-primary: #0B1A3A;
      --bs-body-bg: #F8FAFC;
      --bs-border-radius: 12px;
      --shadow-sm: 0 4px 20px rgba(11, 26, 58, 0.08);
      --shadow-hover: 0 8px 30px rgba(11, 26, 58, 0.15);
      --transition-base: all 0.3s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--light-bg);
      color: var(--text-primary);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-base);
    }

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 导航 */
    .navbar {
      background: rgba(11, 26, 58, 0.85);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 15px rgba(0,0,0,0.1);
      padding: 12px 0;
      transition: var(--transition-base);
    }

    .navbar-brand {
      font-size: 24px;
      font-weight: 700;
      color: var(--starlight-silver) !important;
      letter-spacing: 1px;
    }

    .nav-link {
      color: var(--starlight-silver) !important;
      font-weight: 500;
      margin: 0 4px;
      padding: 8px 14px !important;
      border-radius: 20px;
      position: relative;
    }

    .nav-link:hover,
    .nav-link.active {
      color: white !important;
      background: rgba(255,255,255,0.1);
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 14px;
      right: 14px;
      height: 2px;
      background: var(--starlight-silver);
      transform: scaleX(0);
      transition: transform 0.25s ease;
    }

    .nav-link:hover::after {
      transform: scaleX(1);
    }

    .btn-nav-cta {
      background: var(--gold-accent);
      color: var(--deep-indigo) !important;
      font-weight: 700;
      padding: 10px 24px !important;
      border-radius: 30px;
      margin-left: 16px;
      border: none;
      transition: var(--transition-base);
    }

    .btn-nav-cta:hover {
      background: var(--gold-hover);
      transform: translateY(-2px);
    }

    .navbar-toggler {
      border: 1px solid var(--starlight-silver);
      color: var(--starlight-silver);
    }

    .navbar-toggler-icon {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(232, 238, 242, 1)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      background: linear-gradient(180deg, #0B1A3A 0%, #132B4F 100%);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      display: flex;
      align-items: center;
      color: white;
      position: relative;
    }

    .hero-content {
      max-width: 700px;
    }

    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.3;
      color: white;
      margin-bottom: 20px;
    }

    .hero .lead {
      font-size: 20px;
      color: var(--starlight-silver);
      margin-bottom: 35px;
      line-height: 1.6;
    }

    .btn-hero {
      background: var(--gold-accent);
      color: var(--deep-indigo);
      font-weight: 700;
      padding: 16px 42px;
      border-radius: 40px;
      font-size: 18px;
      border: none;
      transition: var(--transition-base);
      display: inline-block;
    }

    .btn-hero:hover {
      background: var(--gold-hover);
      transform: translateY(-3px);
      box-shadow: 0 15px 30px rgba(245, 158, 11, 0.2);
      color: #0B1A3A;
    }

    /* 通用区块 */
    section {
      padding: 80px 0;
    }

    .section-title {
      font-size: 34px;
      font-weight: 600;
      color: var(--deep-indigo);
      margin-bottom: 16px;
    }

    .section-sub {
      color: var(--text-secondary);
      font-size: 18px;
      margin-bottom: 48px;
    }

    /* 服务卡片 */
    .service-card {
      background: var(--card-bg);
      border-radius: 16px;
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-base);
      border: 1px solid rgba(11,26,58,0.05);
      height: 100%;
      cursor: pointer;
    }

    .service-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }

    .icon-wrap {
      width: 72px;
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 32px;
      margin-bottom: 24px;
      border-radius: 20px;
      background: rgba(11, 26, 58, 0.06);
      color: var(--deep-indigo);
      transition: 0.2s;
    }

    .service-card:hover .icon-wrap {
      background: var(--deep-indigo);
      color: white;
    }

    .service-card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
      color: var(--deep-indigo);
    }

    /* 数据优势 */
    .stat-item {
      text-align: center;
      padding: 20px;
    }

    .stat-number {
      font-size: 50px;
      font-weight: 700;
      color: var(--gold-accent);
      line-height: 1.2;
    }

    .stat-label {
      color: var(--text-secondary);
      font-size: 16px;
      margin-top: 8px;
    }

    /* 案例卡片 */
    .case-card {
      background: white;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-base);
    }

    .case-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }

    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
      transition: transform 0.4s;
    }

    .case-card:hover .case-img {
      transform: scale(1.03);
    }

    .case-body {
      padding: 20px;
    }

    .badge-tag {
      background: rgba(11,26,58,0.08);
      color: var(--deep-indigo);
      font-size: 13px;
      padding: 4px 12px;
      border-radius: 20px;
      margin-right: 6px;
    }

    /* 流程步骤 */
    .step-item {
      text-align: center;
      padding: 20px;
    }

    .step-icon {
      width: 70px;
      height: 70px;
      background: var(--deep-indigo);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 28px;
      margin: 0 auto 20px;
    }

    /* FAQ */
    .accordion-button {
      font-weight: 600;
      background: white;
      color: var(--deep-indigo);
      box-shadow: none;
      border: 1px solid var(--border-light);
    }

    .accordion-button:not(.collapsed) {
      background: var(--deep-indigo);
      color: white;
    }

    .accordion-item {
      border: none;
      margin-bottom: 12px;
      border-radius: 12px !important;
      overflow: hidden;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #0B1A3A 0%, #1E3A5F 100%);
      border-radius: 24px;
      padding: 60px 40px;
      color: white;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }

    .btn-cta-white {
      background: white;
      color: var(--deep-indigo);
      font-weight: 700;
      padding: 16px 38px;
      border-radius: 40px;
      transition: 0.3s;
    }

    .btn-cta-white:hover {
      background: var(--starlight-silver);
    }

    /* Footer */
    footer {
      background: var(--deep-indigo);
      color: var(--starlight-silver);
      padding: 60px 0 30px;
    }

    footer a {
      color: #CBD5E1;
    }

    footer a:hover {
      color: white;
    }

    .footer-brand {
      font-size: 22px;
      font-weight: 700;
      color: white;
    }

    @media (max-width: 768px) {
      .hero h1 {
        font-size: 32px;
      }
      .section-title {
        font-size: 28px;
      }
      .navbar-nav {
        background: rgba(11,26,58,0.95);
        padding: 20px;
        border-radius: 16px;
        margin-top: 10px;
      }
      .btn-nav-cta {
        margin-left: 0;
        margin-top: 8px;
        text-align: center;
      }
      .cta-banner {
        flex-direction: column;
        text-align: center;
      }
    }