/* roulang page: index */
:root {
      --primary-green: #0A8F3C;
      --primary-green-hover: #077A30;
      --accent-orange: #F85C1E;
      --accent-orange-hover: #E04B10;
      --dark-charcoal: #1E1E1E;
      --text-main: #4A4A4A;
      --text-weak: #7A7A7A;
      --bg-light: #F7F8FA;
      --white: #FFFFFF;
      --border-light: #E9ECEF;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.12);
      --border-radius-card: 12px;
      --border-radius-btn: 8px;
      --font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --transition: 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-family);
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.8;
      margin: 0;
      padding-top: 76px; /* offset fixed header */
    }
    a, a:hover, a:focus {
      text-decoration: none;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    /* 覆盖 Bootstrap 默认 */
    .btn:focus, .btn:active, .accordion-button:focus {
      box-shadow: none !important;
    }
    .accordion-button:not(.collapsed) {
      background-color: transparent;
      color: var(--dark-charcoal);
    }
    .container {
      max-width: 1140px;
      padding-left: 15px;
      padding-right: 15px;
    }
    h1, h2, h3, h4 {
      font-weight: 700;
    }
    h1 {
      font-size: 32px;
      color: var(--white);
      line-height: 1.3;
    }
    h2 {
      font-size: 26px;
      color: var(--primary-green);
      margin-bottom: 0.5rem;
    }
    h3 {
      font-size: 20px;
      font-weight: 600;
      color: var(--dark-charcoal);
    }
    h4 {
      font-size: 18px;
      font-weight: 600;
      color: var(--dark-charcoal);
    }
    .section-title {
      text-align: center;
      margin-bottom: 3rem;
    }
    .section-title h2 {
      display: inline-block;
      position: relative;
    }
    .section-title .divider {
      width: 60px;
      height: 3px;
      background-color: var(--accent-orange);
      margin: 8px auto 0;
      border-radius: 2px;
    }
    /* 导航 */
    .navbar-custom {
      background-color: var(--white);
      border-bottom: 1px solid var(--border-light);
      padding: 12px 0;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
    }
    .navbar-brand-custom {
      font-size: 22px;
      font-weight: 700;
      color: var(--dark-charcoal) !important;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .navbar-brand-custom small {
      font-size: 14px;
      font-weight: 400;
      color: var(--text-weak);
      margin-left: 8px;
    }
    .nav-link-custom {
      font-size: 15px;
      font-weight: 500;
      color: var(--dark-charcoal) !important;
      margin: 0 10px;
      transition: var(--transition);
      position: relative;
    }
    .nav-link-custom:hover {
      color: var(--primary-green) !important;
    }
    .nav-link-custom::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background-color: var(--primary-green);
      transition: width 0.2s ease;
    }
    .nav-link-custom:hover::after {
      width: 100%;
    }
    .btn-nav-cta {
      background-color: var(--accent-orange);
      color: white !important;
      border-radius: var(--border-radius-btn);
      padding: 10px 24px;
      font-weight: 600;
      font-size: 15px;
      border: none;
      transition: var(--transition);
      margin-left: 12px;
    }
    .btn-nav-cta:hover {
      background-color: var(--accent-orange-hover);
      transform: scale(1.02);
    }
    /* Hero */
    .hero-section {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      padding: 80px 0;
      min-height: 520px;
      display: flex;
      align-items: center;
    }
    .hero-overlay {
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: rgba(30,30,30,0.65);
      z-index: 1;
    }
    .hero-content {
      position: relative;
      z-index: 2;
    }
    .hero-text h1 {
      font-size: 36px;
      font-weight: 700;
      color: white;
      margin-bottom: 1rem;
    }
    .hero-subtitle {
      font-size: 18px;
      color: rgba(255,255,255,0.85);
      margin-bottom: 2rem;
    }
    .btn-primary-custom {
      background-color: var(--primary-green);
      border: 2px solid var(--primary-green);
      color: white;
      border-radius: var(--border-radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-primary-custom:hover {
      background-color: var(--primary-green-hover);
      border-color: var(--primary-green-hover);
      color: white;
    }
    .btn-outline-custom {
      background: transparent;
      border: 2px solid var(--primary-green);
      color: var(--primary-green);
      border-radius: var(--border-radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline-custom:hover {
      background-color: var(--primary-green);
      color: white;
    }
    .btn-cta-large {
      background-color: var(--accent-orange);
      border: none;
      color: white;
      border-radius: var(--border-radius-btn);
      padding: 16px 40px;
      font-size: 18px;
      font-weight: 600;
      transition: var(--transition);
      display: inline-block;
    }
    .btn-cta-large:hover {
      background-color: var(--accent-orange-hover);
      transform: scale(1.03);
      color: white;
    }
    .hero-image-card {
      background: rgba(255,255,255,0.1);
      border-radius: var(--border-radius-card);
      padding: 10px;
      backdrop-filter: blur(4px);
    }
    .hero-image-card img {
      border-radius: 8px;
      width: 100%;
    }
    /* 卡片通用 */
    .card-custom {
      background: var(--white);
      border-radius: var(--border-radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border: none;
      height: 100%;
    }
    .card-custom:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .icon-circle {
      width: 60px;
      height: 60px;
      border: 2px solid var(--primary-green);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      color: var(--primary-green);
      margin-bottom: 1rem;
    }
    /* 功能分组 */
    .feature-group-img {
      border-radius: var(--border-radius-card);
      overflow: hidden;
    }
    .feature-list {
      list-style: none;
      padding-left: 0;
    }
    .feature-list li {
      position: relative;
      padding-left: 24px;
      margin-bottom: 12px;
      color: var(--text-main);
    }
    .feature-list li::before {
      content: '';
      position: absolute;
      left: 0;
      top: 10px;
      width: 8px;
      height: 8px;
      background-color: var(--primary-green);
      border-radius: 50%;
    }
    .text-link-green {
      color: var(--primary-green);
      font-weight: 600;
      transition: var(--transition);
    }
    .text-link-green:hover {
      color: var(--primary-green-hover);
    }
    /* 场景标签 */
    .badge-orange {
      background-color: var(--accent-orange);
      color: white;
      font-weight: 500;
      border-radius: 20px;
      padding: 4px 12px;
      font-size: 13px;
    }
    /* 数据墙 */
    .stat-number {
      font-size: 36px;
      font-weight: 700;
      color: var(--primary-green);
      line-height: 1.2;
    }
    .stat-label {
      color: var(--text-weak);
      font-size: 14px;
    }
    .case-avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      object-fit: cover;
    }
    /* FAQ 手风琴 */
    .accordion-custom .accordion-item {
      border: none;
      background: transparent;
      border-bottom: 1px solid var(--border-light);
    }
    .accordion-custom .accordion-button {
      font-weight: 600;
      font-size: 18px;
      color: var(--dark-charcoal);
      background: transparent;
      padding: 18px 0;
    }
    .accordion-custom .accordion-button:not(.collapsed) {
      color: var(--primary-green);
      border-left: 4px solid var(--primary-green);
      padding-left: 16px;
    }
    .accordion-custom .accordion-body {
      padding: 0 0 20px 20px;
      color: var(--text-main);
    }
    /* 最终CTA */
    .cta-dark {
      background-color: var(--dark-charcoal);
      padding: 70px 0;
      text-align: center;
    }
    .cta-dark h2 {
      color: white;
    }
    .footer-custom {
      background-color: var(--dark-charcoal);
      color: rgba(255,255,255,0.8);
      padding: 40px 0 20px;
      font-size: 14px;
    }
    .footer-custom a {
      color: rgba(255,255,255,0.8);
    }
    .footer-custom a:hover {
      color: white;
    }
    @media (max-width: 768px) {
      body { padding-top: 66px; }
      h1 { font-size: 26px; }
      .hero-section { padding: 50px 0; min-height: auto; }
      .navbar-nav { margin-top: 12px; }
      .btn-nav-cta { margin-left: 0; margin-top: 8px; }
    }