/* roulang page: index */
:root {
      --primary-deep: #0B1D3A;
      --accent-starlight: #E8EDF5;
      --cta-orange: #FF6B35;
      --bg-light: #F4F7FC;
      --card-white: #FFFFFF;
      --text-dark: #333333;
      --text-muted: #6B7B8D;
      --border-light: #E8EDF5;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 4px 20px rgba(11, 29, 58, 0.06);
      --shadow-hover: 0 12px 32px rgba(11, 29, 58, 0.12);
      --transition: all 0.25s ease;
      --font-cn: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-en: "Inter", "Roboto", sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-cn);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航卡片化面板 */
    .nav-panel {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 1000;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(10px);
      box-shadow: 0 2px 12px rgba(11,29,58,0.04);
      border-bottom: 1px solid var(--border-light);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 0;
      flex-wrap: wrap;
    }
    .logo-area {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--primary-deep);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary-deep);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: bold;
    }
    .nav-categories {
      display: flex;
      gap: 12px;
      align-items: center;
      flex-wrap: wrap;
    }
    .nav-cat-item {
      background: #F4F7FC;
      border-radius: 8px;
      padding: 8px 16px;
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--primary-deep);
      transition: var(--transition);
      text-decoration: none;
      border: 1px solid transparent;
    }
    .nav-cat-item:hover {
      background: var(--accent-starlight);
      color: var(--cta-orange);
      border-color: var(--cta-orange);
    }
    .nav-cat-icon {
      font-size: 1.2rem;
      width: 20px;
      text-align: center;
    }
    .cta-btn-nav {
      background: var(--cta-orange);
      color: white;
      border: none;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.95rem;
      transition: var(--transition);
      cursor: pointer;
      white-space: nowrap;
      text-decoration: none;
      display: inline-block;
    }
    .cta-btn-nav:hover {
      background: #E55A2B;
      transform: scale(1.02);
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary-deep);
      cursor: pointer;
      padding: 8px;
    }
    @media (max-width: 768px) {
      .nav-categories {
        display: none;
        width: 100%;
        flex-direction: column;
        background: white;
        padding: 16px;
        border-radius: 12px;
        margin-top: 8px;
        box-shadow: var(--shadow-card);
      }
      .nav-categories.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .nav-inner {
        flex-wrap: wrap;
      }
    }
    /* Hero */
    .hero {
      padding: 120px 0 80px;
      background: var(--bg-light);
      position: relative;
      overflow: hidden;
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 40px;
    }
    .hero-left {
      flex: 1;
    }
    .hero-right {
      flex: 1;
      min-height: 360px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      position: relative;
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .hero-right::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(11,29,58,0.4), rgba(11,29,58,0.1));
    }
    h1 {
      font-size: 48px;
      line-height: 1.25;
      font-weight: 700;
      color: var(--primary-deep);
      margin-bottom: 1rem;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 1.5rem;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--cta-orange);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition);
      display: inline-block;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: #E55A2B;
      transform: scale(1.02);
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--primary-deep);
      color: var(--primary-deep);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition);
    }
    .btn-secondary:hover {
      background: var(--primary-deep);
      color: white;
    }
    @media (max-width: 1024px) {
      h1 { font-size: 40px; }
    }
    @media (max-width: 768px) {
      .hero .container {
        flex-direction: column;
      }
      h1 { font-size: 32px; }
      .hero-right {
        width: 100%;
        min-height: 240px;
      }
    }
    /* 通用板块 */
    section {
      padding: 80px 0;
    }
    h2 {
      font-size: 36px;
      font-weight: 700;
      color: var(--primary-deep);
      margin-bottom: 1rem;
      text-align: center;
    }
    .section-sub {
      text-align: center;
      color: var(--text-muted);
      max-width: 700px;
      margin: 0 auto 48px;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 24px;
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-light);
      transition: var(--transition);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .pain-card {
      border-left: 4px solid #E15554;
    }
    .solution-card {
      border-left: 4px solid var(--cta-orange);
    }
    .card-icon {
      font-size: 2rem;
      margin-bottom: 12px;
    }
    h3 {
      font-size: 24px;
      font-weight: 600;
      color: var(--primary-deep);
      margin-bottom: 8px;
    }
    .stat-big {
      font-size: 3rem;
      font-weight: 700;
      color: var(--cta-orange);
      font-family: var(--font-en);
    }
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 24px;
      box-shadow: var(--shadow-card);
    }
    .testimonial-text {
      font-style: italic;
      margin-bottom: 16px;
    }
    .avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ddd;
      margin-right: 12px;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      border: 1px solid var(--border-light);
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: transparent;
      transition: background 0.2s;
    }
    .faq-answer {
      padding: 0 24px 20px;
      display: none;
      color: var(--text-muted);
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active .faq-question {
      background: #F4F7FC;
      border-left: 4px solid var(--cta-orange);
    }
    .cta-section {
      background: var(--primary-deep);
      color: white;
      text-align: center;
    }
    .cta-section h2 {
      color: white;
    }
    .footer {
      background: var(--primary-deep);
      color: #ccc;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer a {
      color: #ccc;
      text-decoration: none;
    }
    .footer a:hover {
      color: var(--cta-orange);
    }
    @media (max-width: 1024px) {
      .grid-3, .testimonial-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      h2 { font-size: 32px; }
    }
    @media (max-width: 768px) {
      .grid-3, .testimonial-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      h2 { font-size: 28px; }
      h3 { font-size: 20px; }
    }
    input, textarea {
      width: 100%;
      padding: 12px;
      margin-bottom: 16px;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-btn);
      background: #F4F7FC;
    }
    input:focus, textarea:focus {
      outline: none;
      border-color: var(--cta-orange);
    }