/* roulang page: index */
:root {
      --primary: #0B5E7C;
      --primary-dark: #094B66;
      --accent: #F28C38;
      --accent-dark: #E07B2C;
      --bg-white: #FFFFFF;
      --bg-light: #F4F6F9;
      --bg-card: #F8FAFB;
      --bg-blueish: #EAF0F4;
      --text-heading: #1A2B34;
      --text-body: #4A5568;
      --text-muted: #8899A6;
      --border-light: #E2E8F0;
      --shadow-sm: 0 2px 8px rgba(11, 94, 124, 0.04);
      --shadow-md: 0 8px 20px rgba(11, 94, 124, 0.08);
      --shadow-btn: 0 6px 16px rgba(11, 94, 124, 0.25);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-lg: 16px;
      --transition: 0.25s ease;
      --font-sans: 'Inter', 'SF Pro Text', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-display: 'DM Sans', 'Inter', 'PingFang SC', sans-serif;
      --font-mono: 'JetBrains Mono', 'SF Mono', 'Cascadia Code', monospace;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-white);
      color: var(--text-body);
      line-height: 1.7;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1140px;
      margin: 0 auto;
      padding-left: 16px;
      padding-right: 16px;
    }
    /* 导航 */
    .navbar-custom {
      background: var(--bg-white);
      border-bottom: 1px solid var(--border-light);
      height: 64px;
      padding: 0;
      position: sticky;
      top: 0;
      z-index: 1020;
    }
    .navbar-brand-custom {
      font-family: var(--font-display);
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--primary) !important;
      letter-spacing: -0.02em;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .brand-dot {
      width: 6px;
      height: 6px;
      background: var(--accent);
      border-radius: 50%;
      display: inline-block;
    }
    .navbar-nav .nav-link {
      font-weight: 500;
      color: var(--text-body) !important;
      padding: 0 0 4px 0 !important;
      margin-left: 32px;
      position: relative;
      font-size: 0.95rem;
      transition: var(--transition);
    }
    .navbar-nav .nav-link.active,
    .navbar-nav .nav-link:hover {
      color: var(--primary) !important;
    }
    .navbar-nav .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
    }
    .navbar-nav .nav-link.active::after,
    .navbar-nav .nav-link:hover::after {
      width: 100%;
    }
    .navbar-toggler {
      border: none;
      padding: 4px;
    }
    .navbar-toggler-icon {
      background-image: none;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--text-heading);
      font-size: 1.6rem;
      line-height: 1;
    }
    .navbar-toggler:focus {
      box-shadow: none;
    }
    @media (max-width: 991px) {
      .navbar-nav .nav-link {
        margin-left: 0;
        padding: 10px 0 !important;
        border-bottom: 1px solid var(--border-light);
      }
      .navbar-collapse {
        background: var(--bg-white);
        padding: 16px;
        box-shadow: var(--shadow-sm);
      }
    }
    /* 板块间距 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
    }
    /* Hero */
    .hero-bg {
      background-color: var(--bg-white);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      align-items: center;
      gap: 60px;
    }
    .hero-title {
      font-family: var(--font-display);
      font-weight: 700;
      font-size: 3.2rem;
      line-height: 1.2;
      letter-spacing: -0.02em;
      color: var(--text-heading);
    }
    .hero-sub {
      color: var(--text-body);
      font-size: 1.15rem;
      margin: 24px 0 32px;
      max-width: 480px;
    }
    .btn-primary-custom {
      background: var(--accent);
      border: none;
      color: #fff;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
      box-shadow: 0 4px 12px rgba(242, 140, 56, 0.2);
      display: inline-block;
    }
    .btn-primary-custom:hover {
      background: var(--accent-dark);
      box-shadow: var(--shadow-btn);
      transform: translateY(-2px);
      color: #fff;
    }
    .btn-link-custom {
      color: var(--accent);
      font-weight: 500;
      margin-left: 24px;
      border-bottom: 2px solid transparent;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .btn-link-custom:hover {
      border-bottom-color: var(--accent);
      color: var(--accent-dark);
    }
    .hero-image {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-lg);
      min-height: 380px;
      box-shadow: var(--shadow-sm);
    }
    @media (max-width: 992px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-title {
        font-size: 2.4rem;
      }
      .hero-image {
        order: -1;
        min-height: 260px;
        width: 80%;
        margin: 0 auto;
      }
      .hero-sub {
        margin-left: auto;
        margin-right: auto;
      }
    }
    /* 痛点区 */
    .pain-solution-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: start;
    }
    .pain-item {
      display: flex;
      gap: 16px;
      margin-bottom: 24px;
      align-items: flex-start;
    }
    .pain-icon {
      width: 24px;
      height: 24px;
      color: var(--primary);
      flex-shrink: 0;
    }
    .solution-card {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 24px;
      margin-bottom: 16px;
      transition: var(--transition);
    }
    .solution-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-md);
    }
    .solution-tag {
      color: var(--accent);
      font-weight: 600;
      font-size: 0.85rem;
      text-transform: uppercase;
      letter-spacing: 0.02em;
    }
    @media (max-width: 768px) {
      .pain-solution-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 优势卡片 */
    .feature-card {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      height: 100%;
      border: 1px solid transparent;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--border-light);
    }
    .feature-icon {
      color: var(--primary);
      margin-bottom: 20px;
    }
    .feature-metric {
      font-family: var(--font-mono);
      font-weight: 700;
      font-size: 2.4rem;
      color: var(--accent);
      margin: 12px 0 8px;
    }
    /* 数据网格 */
    .data-grid {
      background: var(--bg-light);
      border-radius: var(--radius-lg);
      padding: 64px 40px;
    }
    .stat-number {
      font-family: var(--font-mono);
      font-weight: 700;
      font-size: 3.2rem;
      color: var(--primary);
    }
    .stat-label {
      color: var(--text-muted);
      font-size: 0.9rem;
      margin-top: 8px;
    }
    .stat-divider {
      width: 40px;
      height: 2px;
      background: rgba(11, 94, 124, 0.2);
      margin: 12px 0;
    }
    /* 证言 */
    .testimonial-card {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      height: 100%;
      border: none;
    }
    .testimonial-quote {
      font-style: italic;
      font-size: 1.05rem;
      color: var(--text-heading);
      margin-bottom: 20px;
    }
    .avatar-placeholder {
      width: 48px;
      height: 48px;
      background: #E2E8F0;
      border-radius: 50%;
      background-image: url('/assets/images/coverpic/cover-1.webp');
      background-size: cover;
    }
    /* FAQ */
    .accordion-custom .accordion-item {
      border: none;
      border-bottom: 1px solid var(--border-light);
      background: transparent;
    }
    .accordion-custom .accordion-button {
      font-weight: 600;
      color: var(--text-heading);
      background: transparent;
      box-shadow: none;
      padding: 16px 0;
      font-size: 1.05rem;
      border-left: 2px solid var(--primary);
      padding-left: 16px;
      transition: var(--transition);
    }
    .accordion-custom .accordion-button:not(.collapsed) {
      border-left-color: var(--accent);
      color: var(--primary);
      background: transparent;
    }
    .accordion-custom .accordion-body {
      padding: 0 0 16px 20px;
      color: var(--text-body);
      line-height: 1.7;
    }
    /* CTA */
    .cta-section {
      background: linear-gradient(180deg, rgba(11,94,124,0.03) 0%, #fff 90%);
    }
    .partner-logos img {
      max-height: 36px;
      opacity: 0.65;
      transition: var(--transition);
      filter: grayscale(1);
    }
    .partner-logos img:hover {
      opacity: 1;
      filter: grayscale(0);
    }
    /* 页脚 */
    .footer-custom {
      background: var(--bg-white);
      border-top: 1px solid var(--border-light);
      padding: 24px 0;
      font-size: 0.85rem;
      color: var(--text-muted);
    }
    .footer-custom a {
      color: var(--text-muted);
    }
    .footer-custom a:hover {
      color: var(--accent);
      text-decoration: underline;
    }
    /* 通用标题 */
    .section-title {
      font-family: var(--font-display);
      font-weight: 600;
      font-size: 2.2rem;
      color: var(--text-heading);
      margin-bottom: 16px;
    }
    .section-sub {
      color: var(--text-body);
      max-width: 600px;
      margin: 0 auto 48px;
    }
    @media (max-width: 576px) {
      .section-title {
        font-size: 1.8rem;
      }
    }