/* roulang page: index */
:root {
      --primary-blue: #1E88E5;
      --accent-orange: #FF7043;
      --bg-light: #F5F7FA;
      --white: #FFFFFF;
      --text-dark: #1E293B;
      --text-mid: #64748B;
      --border-light: #E2E8F0;
      --success-green: #10B981;
      --footer-bg: #1E293B;
      --footer-text: #CBD5E1;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 8px 24px rgba(0,0,0,0.08);
      --font-stack: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
      --transition: 0.2s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-stack);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.6;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4, h5, h6 {
      font-weight: 600;
      margin-bottom: 0.5rem;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container-custom {
      max-width: 1140px;
      margin: 0 auto;
      padding-left: 15px;
      padding-right: 15px;
    }
    /* 导航 */
    .navbar-custom {
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(10px);
      box-shadow: 0 4px 12px rgba(0,0,0,0.02);
      padding: 0.8rem 0;
      transition: var(--transition);
      position: sticky;
      top: 0;
      z-index: 1020;
      border-bottom: 1px solid var(--border-light);
    }
    .navbar-custom .navbar-brand {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary-blue);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
    }
    .navbar-custom .navbar-brand i {
      font-size: 1.8rem;
      margin-right: 8px;
      color: var(--accent-orange);
    }
    .navbar-custom .nav-link {
      color: var(--text-dark);
      font-size: 0.9rem;
      font-weight: 500;
      margin: 0 0.3rem;
      padding: 0.5rem 0.8rem !important;
      border-bottom: 2px solid transparent;
      transition: var(--transition);
    }
    .navbar-custom .nav-link:hover,
    .navbar-custom .nav-link.active {
      color: var(--primary-blue);
      border-bottom-color: var(--accent-orange);
    }
    .navbar-toggler {
      border: none;
      color: var(--text-dark);
    }
    .navbar-toggler:focus {
      box-shadow: none;
    }
    .search-icon {
      font-size: 1.2rem;
      color: var(--text-mid);
      cursor: default;
      margin-left: 10px;
    }
    /* 按钮 */
    .btn-primary-custom {
      background: var(--accent-orange);
      border: none;
      color: white;
      font-weight: 600;
      padding: 0.7rem 1.8rem;
      border-radius: var(--radius-btn);
      transition: var(--transition);
      display: inline-block;
      text-align: center;
    }
    .btn-primary-custom:hover {
      background: #E55A2B;
      color: white;
      transform: translateY(-1px);
    }
    .btn-outline-custom {
      background: transparent;
      border: 2px solid var(--primary-blue);
      color: var(--primary-blue);
      font-weight: 600;
      padding: 0.6rem 1.7rem;
      border-radius: var(--radius-btn);
      transition: var(--transition);
    }
    .btn-outline-custom:hover {
      background: var(--primary-blue);
      color: white;
    }
    /* Hero */
    .hero-section {
      background: linear-gradient(rgba(0,0,0,0.45), rgba(0,0,0,0.5)), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 85vh;
      display: flex;
      align-items: center;
      color: white;
      position: relative;
    }
    .hero-content h1 {
      font-size: 3.4rem;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 1.2rem;
    }
    .hero-content p {
      font-size: 1.2rem;
      opacity: 0.9;
      margin-bottom: 2rem;
    }
    /* 区块间距 */
    section {
      padding: 5rem 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 3.5rem 0;
      }
      .hero-content h1 {
        font-size: 2.3rem;
      }
    }
    .section-title h2 {
      font-size: 2.2rem;
      font-weight: 600;
      margin-bottom: 0.5rem;
      color: var(--text-dark);
    }
    .section-title p {
      color: var(--text-mid);
      font-size: 1.1rem;
    }
    /* 卡片 */
    .card-custom {
      background: var(--white);
      border: none;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all 0.25s ease;
      height: 100%;
      padding: 1.8rem;
    }
    .card-custom:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
    }
    .card-icon {
      font-size: 2.2rem;
      color: var(--primary-blue);
      margin-bottom: 1rem;
    }
    .pain-point-item {
      background: var(--white);
      border-radius: 12px;
      padding: 1.4rem;
      box-shadow: var(--shadow-card);
      margin-bottom: 1.5rem;
      display: flex;
      align-items: center;
      gap: 1rem;
    }
    .testimonial-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 1.8rem;
      box-shadow: var(--shadow-card);
      height: 100%;
    }
    .testimonial-text {
      font-style: italic;
      position: relative;
      padding-left: 1.5rem;
      color: var(--text-dark);
    }
    .testimonial-text::before {
      content: "“";
      font-size: 3rem;
      color: var(--primary-blue);
      position: absolute;
      left: -10px;
      top: -15px;
    }
    .data-number {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--success-green);
      line-height: 1.2;
    }
    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: transparent;
      color: var(--primary-blue);
      font-weight: 600;
      box-shadow: none;
    }
    .accordion-button:focus {
      border-color: var(--primary-blue);
      box-shadow: 0 0 0 3px rgba(30,136,229,0.15);
    }
    .accordion-item {
      border: 1px solid var(--border-light);
      border-radius: 10px !important;
      margin-bottom: 12px;
      background: var(--white);
    }
    /* 表单 */
    .form-control {
      border: 1px solid var(--border-light);
      border-radius: 8px;
      padding: 0.7rem 1rem;
    }
    .form-control:focus {
      border-color: var(--primary-blue);
      box-shadow: 0 0 0 3px rgba(30,136,229,0.1);
    }
    /* 页脚 */
    .footer-custom {
      background: var(--footer-bg);
      color: var(--footer-text);
      padding: 3rem 0 1.5rem;
    }
    .footer-custom a {
      color: var(--footer-text);
      text-decoration: none;
    }
    .footer-custom a:hover {
      color: white;
    }
    .footer-brand {
      font-weight: 700;
      font-size: 1.3rem;
      color: white;
    }
    @media (max-width: 576px) {
      .hero-content h1 {
        font-size: 2rem;
      }
      .btn-primary-custom, .btn-outline-custom {
        width: 100%;
        margin-bottom: 0.5rem;
      }
      .navbar-custom .nav-link {
        margin: 0.2rem 0;
      }
    }