/* roulang page: index */
:root {
      --primary: #E8451E;
      --primary-dark: #c03818;
      --secondary: #1A1E2B;
      --accent: #F5A623;
      --bg-warm: #F9F7F4;
      --text-body: #3A3F4A;
      --text-muted: #6B707A;
      --white: #FFFFFF;
      --card-shadow: 0 8px 30px rgba(26, 30, 43, 0.06);
      --card-shadow-hover: 0 16px 40px rgba(26, 30, 43, 0.12);
      --border-radius-lg: 16px;
      --border-radius-btn: 50px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-number: 'DIN Alternate', 'Bebas Neue', 'PingFang SC', sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.65;
      margin: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4, h5, h6 {
      font-family: var(--font-heading);
      color: var(--secondary);
      font-weight: 600;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.2s ease;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 顶部信息条 */
    .top-bar {
      background-color: var(--secondary);
      color: rgba(255,255,255,0.85);
      font-size: 12px;
      height: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 24px;
      letter-spacing: 0.3px;
    }
    .top-bar span:first-child {
      font-weight: 400;
    }
    /* 主导航 */
    .main-nav {
      background: var(--white);
      padding: 12px 0;
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      position: sticky;
      top: 0;
      z-index: 1020;
    }
    .navbar-brand {
      font-size: 22px;
      font-weight: 700;
      color: var(--secondary) !important;
      letter-spacing: 1px;
    }
    .navbar-brand span {
      color: var(--primary);
    }
    .nav-link {
      color: var(--secondary) !important;
      font-weight: 500;
      margin: 0 4px;
      padding: 6px 16px !important;
      border-radius: 30px;
      position: relative;
      transition: 0.2s;
    }
    .nav-link:hover,
    .nav-link.active {
      color: var(--primary) !important;
      background-color: rgba(232, 69, 30, 0.04);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 3px;
      background: var(--primary);
      border-radius: 3px;
      transition: width 0.2s;
    }
    .nav-link:hover::after,
    .nav-link.active::after {
      width: 24px;
    }
    .navbar-toggler {
      border: none;
      color: var(--secondary);
      font-size: 1.5rem;
      padding: 0.25rem 0.5rem;
    }
    .navbar-toggler:focus {
      box-shadow: none;
    }
    @media (max-width: 768px) {
      .navbar-collapse {
        background: var(--secondary);
        border-radius: 20px;
        padding: 20px;
        margin-top: 12px;
      }
      .navbar-collapse .nav-link {
        color: white !important;
        margin: 6px 0;
      }
      .navbar-collapse .nav-link:hover {
        background: rgba(255,255,255,0.1);
      }
    }
    /* Hero */
    .hero-section {
      background: linear-gradient(135deg, #1A1E2B 0%, #E8451E 100%);
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      color: white;
    }
    .hero-section::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.15;
      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;
    }
    .hero-sub {
      font-size: 1.2rem;
      opacity: 0.9;
      margin: 20px 0 32px;
    }
    .btn-primary-custom {
      background: linear-gradient(135deg, #E8451E, #F5A623);
      border: none;
      color: white;
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--border-radius-btn);
      transition: all 0.3s;
      box-shadow: 0 8px 18px rgba(232,69,30,0.3);
    }
    .btn-primary-custom:hover {
      transform: scale(1.02);
      filter: brightness(1.08);
      box-shadow: 0 12px 24px rgba(232,69,30,0.4);
      color: white;
    }
    .btn-outline-custom {
      background: transparent;
      border: 2px solid white;
      color: white;
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--border-radius-btn);
      transition: 0.3s;
    }
    .btn-outline-custom:hover {
      background: rgba(255,255,255,0.15);
      border-color: white;
    }
    @media (max-width: 768px) {
      .hero-title {
        font-size: 2.1rem;
      }
      .hero-sub {
        font-size: 1rem;
      }
    }
    /* 板块标题 */
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 1rem;
      color: var(--secondary);
    }
    .section-desc {
      color: var(--text-muted);
      font-size: 1.1rem;
      max-width: 700px;
      margin: 0 auto 3rem;
    }
    /* 服务卡片 */
    .service-card {
      background: var(--white);
      border-radius: var(--border-radius-lg);
      padding: 32px 24px;
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
      border: 1px solid transparent;
      height: 100%;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-shadow-hover);
      border-color: rgba(232,69,30,0.2);
    }
    .service-icon {
      width: 64px;
      height: 64px;
      background: rgba(232,69,30,0.08);
      border-radius: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
    }
    /* 数据徽章 */
    .stat-item {
      background: var(--white);
      border-radius: 20px;
      padding: 24px 16px;
      text-align: center;
      border-bottom: 4px solid var(--primary);
      box-shadow: 0 4px 12px rgba(0,0,0,0.02);
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--accent);
    }
    /* 案例卡片 */
    .case-card {
      background: white;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: 0.25s;
      min-width: 260px;
    }
    .case-card:hover {
      transform: scale(1.02);
    }
    /* 步骤 */
    .step-circle {
      width: 48px;
      height: 48px;
      background: var(--primary);
      color: white;
      border-radius: 50%;
      font-weight: 700;
      font-size: 1.5rem;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: #FFF3EF;
      color: var(--primary);
      font-weight: 600;
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: transparent;
    }
    /* CTA 横幅 */
    .cta-banner {
      background: var(--secondary);
      background-image: radial-gradient(circle at 20% 30%, rgba(232,69,30,0.15) 0%, transparent 60%);
      border-radius: 24px;
      padding: 60px 24px;
      color: white;
    }
    /* 页脚 */
    .footer {
      background: var(--secondary);
      color: rgba(255,255,255,0.8);
      padding: 60px 0 20px;
    }
    .footer a {
      color: rgba(255,255,255,0.7);
    }
    .footer a:hover {
      color: var(--primary);
    }