/* roulang page: index */
:root {
      --primary: #E8451E;
      --primary-dark: #C93A14;
      --primary-soft: rgba(232, 69, 30, 0.1);
      --secondary: #1E1E24;
      --accent-green: #3BA55C;
      --bg-warm: #F7F5F2;
      --white: #FFFFFF;
      --text-dark: #1E1E24;
      --text-body: #3A3A42;
      --text-muted: #6F6F78;
      --border-light: #E6E3DF;
      --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.06);
      --shadow-hover: 0 12px 28px rgba(0, 0, 0, 0.10);
      --radius-xl: 24px;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-full: 40px;
      --transition: 0.25s ease;
      --max-width: 1200px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Inter', system-ui, -apple-system, sans-serif;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      font-weight: 600;
      font-size: 16px;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border-radius: var(--radius-full);
      padding: 14px 32px;
      min-height: 48px;
    }

    h1, h2, h3, h4 {
      color: var(--text-dark);
      font-weight: 700;
      line-height: 1.3;
    }

    h1 {
      font-size: 48px;
      letter-spacing: -0.5px;
      font-weight: 800;
    }

    h2 {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 16px;
    }

    h3 {
      font-size: 20px;
      font-weight: 600;
    }

    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0,0,0,0.02);
      transition: var(--transition);
    }
    .nav .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 24px;
      font-weight: 800;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      font-size: 28px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      color: var(--text-dark);
      font-weight: 500;
      font-size: 15px;
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      box-shadow: 0 4px 10px rgba(232, 69, 30, 0.25);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 8px 18px rgba(232, 69, 30, 0.35);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background: var(--primary-soft);
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 26px;
      color: var(--text-dark);
    }

    /* Hero */
    .hero {
      padding: 140px 0 80px;
      background: linear-gradient(135deg, #E8451E 0%, #1E1E24 100%);
      color: white;
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }
    .hero-content {
      flex: 1 1 50%;
    }
    .hero-content h1 {
      color: white;
      margin-bottom: 20px;
      font-size: 48px;
    }
    .hero-sub {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 32px;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }
    .hero-stats {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }
    .stat-badge {
      background: rgba(255,255,255,0.12);
      backdrop-filter: blur(4px);
      border-radius: var(--radius-md);
      padding: 16px 20px;
      color: white;
      min-width: 120px;
    }
    .stat-number {
      font-size: 32px;
      font-weight: 800;
      color: #FFD966;
      display: block;
    }
    .stat-label {
      font-size: 14px;
      opacity: 0.85;
    }
    .hero-image {
      flex: 1 1 40%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: var(--radius-xl);
      min-height: 360px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    }

    /* 板块通用 */
    .section {
      padding: 80px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-title h2 {
      margin-bottom: 8px;
    }
    .section-title p {
      color: var(--text-muted);
      max-width: 600px;
      margin: 0 auto;
    }

    /* 痛点区 */
    .pain-points {
      background: var(--white);
      display: flex;
      align-items: center;
      gap: 40px;
      flex-wrap: wrap;
    }
    .pain-text {
      flex: 1;
      font-size: 20px;
    }
    .pain-graphic {
      flex: 1;
      background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
      height: 280px;
      border-radius: var(--radius-xl);
    }

    /* 解决方案 2+1 */
    .solutions-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      align-items: start;
    }
    .solution-card-stack {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .solution-card {
      background: var(--white);
      border-radius: var(--radius-xl);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .solution-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
      border: 1px solid rgba(232, 69, 30, 0.2);
    }
    .solution-highlight {
      background: linear-gradient(135deg, #E8451E, #1E1E24);
      color: white;
      border-radius: var(--radius-xl);
      padding: 40px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      height: 100%;
    }
    .solution-highlight h3, .solution-highlight p {
      color: white;
    }
    .icon-circle {
      font-size: 32px;
      margin-bottom: 16px;
    }

    /* 数据区 */
    .data-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }
    .data-item {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 24px;
      text-align: center;
      box-shadow: var(--shadow-sm);
    }
    .data-number {
      font-size: 40px;
      font-weight: 800;
      color: var(--primary);
    }

    /* 案例横向滚动 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
    }
    .case-card {
      flex: 0 0 300px;
      background: white;
      border-radius: var(--radius-xl);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      scroll-snap-align: start;
    }
    .case-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }
    .case-body {
      padding: 20px;
    }

    /* 证言 */
    .testimonial blockquote {
      font-size: 20px;
      font-style: italic;
      margin-bottom: 12px;
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      padding: 0 20px;
    }
    .faq-question {
      width: 100%;
      display: flex;
      justify-content: space-between;
      padding: 20px 0;
      font-weight: 600;
    }

    /* CTA */
    .cta-band {
      background: radial-gradient(circle at 30% 30%, #E8451E, #C93A14);
      color: white;
      text-align: center;
      padding: 80px 24px;
    }

    /* Footer */
    .footer {
      background: #1E1E24;
      color: #B0B0B8;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      h1 { font-size: 40px; }
      .data-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-menu-toggle { display: block; }
      .hero .container { flex-direction: column; }
      .solutions-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      h1 { font-size: 36px; }
    }
    @media (max-width: 520px) {
      .hero-stats { flex-direction: column; }
    }