/* roulang page: index */
:root {
      --primary: #1A5FDC;
      --primary-dark: #1349A8;
      --secondary: #FF6B35;
      --secondary-dark: #E55A2B;
      --bg-white: #FFFFFF;
      --bg-light: #F8F9FA;
      --bg-dark: #1E293B;
      --text-primary: #1E293B;
      --text-secondary: #64748B;
      --text-light: #94A3B8;
      --border: #E2E8F0;
      --radius-sm: 8px;
      --radius: 12px;
      --radius-lg: 16px;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
      --shadow: 0 8px 24px rgba(0,0,0,0.06);
      --shadow-hover: 0 16px 32px rgba(0,0,0,0.08);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", Helvetica, Arial, sans-serif;
      --font-number: "Inter", "SF Pro Display", -apple-system, BlinkMacSystemFont, sans-serif;
      --transition: all 0.2s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background: var(--bg-white);
      color: var(--text-primary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }
    h1, h2, h3, h4 {
      font-weight: 700;
      letter-spacing: -0.02em;
    }
    h1 {
      font-size: 3.05rem;
      line-height: 1.2;
    }
    h2 {
      font-size: 2.4rem;
      margin-bottom: 1.5rem;
      color: var(--text-primary);
    }
    h3 {
      font-size: 1.5rem;
      margin-bottom: 0.5rem;
    }
    p {
      color: var(--text-secondary);
      max-width: 70ch;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
    }
    .section-padding {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      .section-padding {
        padding: 70px 0;
      }
      h1 {
        font-size: 2.2rem;
      }
      h2 {
        font-size: 1.9rem;
      }
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(10px);
      z-index: 100;
      border-bottom: 1px solid transparent;
      transition: var(--transition);
    }
    .header.scrolled {
      border-bottom-color: var(--border);
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      font-size: 2rem;
      color: var(--secondary);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-primary);
      transition: color 0.2s;
      font-size: 0.95rem;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .btn-primary {
      background: var(--secondary);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      border: none;
      transition: var(--transition);
      box-shadow: 0 4px 12px rgba(255,107,53,0.3);
      display: inline-block;
    }
    .btn-primary:hover {
      background: var(--secondary-dark);
      box-shadow: 0 8px 18px rgba(255,107,53,0.4);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 10px 26px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      background: none;
      border: none;
      color: var(--text-primary);
    }
    @media (max-width: 1024px) {
      .nav-links {
        gap: 20px;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 24px;
        box-shadow: var(--shadow);
        border-bottom: 1px solid var(--border);
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .nav-cta {
        display: none;
      }
    }
    /* Hero */
    .hero {
      padding-top: 140px;
      padding-bottom: 80px;
      background: var(--bg-white);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero-left h1 {
      color: #0F172A;
    }
    .hero-left .subtitle {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin: 20px 0 32px;
      line-height: 1.6;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-right {
      background: linear-gradient(135deg, #f0f4ff 0%, #ffffff 100%);
      border-radius: var(--radius-lg);
      padding: 16px;
      box-shadow: var(--shadow);
      display: flex;
      justify-content: center;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      min-height: 380px;
      position: relative;
    }
    .hero-right img {
      border-radius: var(--radius);
      box-shadow: 0 20px 30px rgba(0,0,0,0.15);
      max-width: 85%;
      position: relative;
      z-index: 2;
      background: white;
    }
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .hero-right {
        min-height: 280px;
        order: -1;
      }
      .hero-buttons {
        justify-content: center;
      }
    }
    /* Highlights 三列网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
      margin-top: 20px;
    }
    .highlight-card {
      background: white;
      padding: 32px 24px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      text-align: center;
    }
    .highlight-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-6px);
    }
    .highlight-icon {
      font-size: 2.5rem;
      color: var(--secondary);
      margin-bottom: 20px;
      background: #FFF5F0;
      width: 70px;
      height: 70px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 20px;
      margin-left: auto;
      margin-right: auto;
    }
    @media (max-width: 768px) {
      .highlights-grid {
        grid-template-columns: 1fr;
        gap: 20px;
      }
    }
    /* 产品展示非对称网格 */
    .showcase-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 24px;
    }
    .showcase-item {
      background: white;
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .showcase-item:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .showcase-item.large {
      grid-column: span 2;
      grid-row: span 2;
    }
    .showcase-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }
    .showcase-item.large .showcase-img {
      height: 320px;
    }
    .showcase-content {
      padding: 20px;
    }
    @media (max-width: 768px) {
      .showcase-grid {
        grid-template-columns: 1fr 1fr;
      }
      .showcase-item.large {
        grid-column: span 2;
        grid-row: span 1;
      }
    }
    /* 对比表格 */
    .compare-table {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 32px;
    }
    .compare-card {
      background: white;
      border-radius: var(--radius);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      border: 2px solid transparent;
      transition: var(--transition);
    }
    .compare-card.featured {
      border-color: var(--primary);
      box-shadow: var(--shadow);
      position: relative;
    }
    .compare-card h3 {
      margin-bottom: 16px;
    }
    .compare-list {
      list-style: none;
      margin: 20px 0;
    }
    .compare-list li {
      padding: 8px 0;
      border-bottom: 1px solid var(--border);
      color: var(--text-secondary);
    }
    @media (max-width: 768px) {
      .compare-table {
        grid-template-columns: 1fr;
      }
    }
    /* FAQ 手风琴 */
    .faq-list {
      max-width: 800px;
      margin: 30px auto 0;
    }
    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.15rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--text-primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
      padding-right: 30px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    /* CTA 全宽 */
    .cta-band {
      background: var(--primary);
      color: white;
      text-align: center;
      padding: 80px 20px;
      border-radius: 0;
      background-image: url('/assets/images/backpic/back-2.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      position: relative;
    }
    .cta-band h2 {
      color: white;
      margin-bottom: 16px;
    }
    .footer {
      background: var(--bg-dark);
      color: #CBD5E1;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: white;
      margin-bottom: 16px;
    }
    .footer a {
      color: #94A3B8;
      transition: color 0.2s;
    }
    .footer a:hover {
      color: white;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }