/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --primary: #FF6B35;
      --primary-hover: #E55A2B;
      --secondary: #1A1D23;
      --accent: #00C9A7;
      --bg-warm: #F8F7F4;
      --bg-white: #FFFFFF;
      --bg-dark: #1A1D23;
      --text-main: #1A1D23;
      --text-muted: #5A5D63;
      --text-light: #FFFFFF;
      --border-light: rgba(0,0,0,0.06);
      --shadow-card: 0 4px 24px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.1);
      --radius-lg: 16px;
      --radius-btn: 12px;
      --font-title: "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-number: "DIN Alternate", "Bebas Neue", "PingFang SC", sans-serif;
      --font-en: "Inter", system-ui, sans-serif;
      --transition: 0.3s ease;
      --container: 1280px;
      --nav-height: 80px;
    }
    body {
      font-family: var(--font-title);
      background-color: var(--bg-white);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, input {
      font-family: inherit;
    }
    .container {
      max-width: var(--container);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      height: var(--nav-height);
      display: flex;
      align-items: center;
      background: transparent;
      transition: background var(--transition), backdrop-filter var(--transition), box-shadow var(--transition);
    }
    .nav.scrolled {
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 rgba(0,0,0,0.05);
    }
    .nav .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--text-light);
      transition: color var(--transition);
      letter-spacing: 0.5px;
    }
    .nav.scrolled .logo {
      color: var(--text-main);
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-light);
      position: relative;
      padding: 8px 0;
      transition: color var(--transition);
    }
    .nav.scrolled .nav-links a {
      color: var(--text-main);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 3px;
      background: var(--primary);
      transition: width var(--transition);
      border-radius: 2px;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      background: transparent;
      border: none;
      z-index: 1001;
    }
    .hamburger span {
      width: 28px;
      height: 2px;
      background: var(--text-light);
      transition: var(--transition);
      border-radius: 4px;
    }
    .nav.scrolled .hamburger span {
      background: var(--text-main);
    }
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--bg-dark);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      transform: translateX(100%);
      transition: transform 0.4s ease;
      z-index: 999;
    }
    .mobile-menu.active {
      transform: translateX(0);
    }
    .mobile-menu a {
      font-size: 24px;
      color: var(--text-light);
      font-weight: 600;
    }
    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }
    /* Hero */
    .hero {
      height: 100vh;
      min-height: 700px;
      background: linear-gradient(135deg, rgba(26,29,35,0.85) 0%, rgba(26,29,35,0.6) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      color: var(--text-light);
      position: relative;
    }
    .hero-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
      flex-wrap: wrap;
    }
    .hero-text {
      flex: 1 1 400px;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 24px;
    }
    .hero p {
      font-size: 18px;
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn {
      display: inline-block;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: var(--transition);
      text-align: center;
      cursor: pointer;
      border: none;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: scale(1.02);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background: rgba(255,107,53,0.1);
    }
    .hero-mockup {
      flex: 1 1 300px;
      max-width: 360px;
      animation: float 4s ease-in-out infinite;
    }
    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-12px); }
      100% { transform: translateY(0); }
    }
    /* 痛点区 */
    .problem-grid {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
      margin-top: 40px;
    }
    .problem-card {
      flex: 1 1 250px;
      background: var(--bg-white);
      padding: 28px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    /* 解决方案网格 */
    .solution-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      margin-top: 40px;
    }
    .solution-left {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .solution-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .solution-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .solution-highlight {
      background: linear-gradient(135deg, #FFF3ED, white);
      border: 1px solid rgba(255,107,53,0.2);
      grid-row: span 2;
    }
    .icon-box {
      width: 48px;
      height: 48px;
      background: #FFF3ED;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      margin-bottom: 16px;
    }
    /* 数据区 */
    .data-bg {
      background: linear-gradient(rgba(255,255,255,0.9), rgba(255,255,255,0.95)), url('/assets/images/backpic/back-2.webp') center/cover;
    }
    .stats-grid {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
      margin-top: 40px;
    }
    .stat-card {
      flex: 1 1 200px;
      background: white;
      padding: 32px;
      border-radius: var(--radius-lg);
      text-align: center;
      box-shadow: var(--shadow-card);
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 40px;
      font-weight: 700;
      color: var(--accent);
    }
    /* 证言 */
    .testimonials-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding: 20px 0;
      scroll-snap-type: x mandatory;
    }
    .testimonial-card {
      min-width: 300px;
      background: #F8F7F4;
      border-radius: var(--radius-lg);
      padding: 28px;
      scroll-snap-align: start;
    }
    .avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ddd;
      margin-right: 12px;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid #eee;
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    /* CTA */
    .cta-dark {
      background: var(--bg-dark);
      color: white;
      text-align: center;
      padding: 100px 0;
    }
    .trust-badges {
      display: flex;
      justify-content: center;
      gap: 32px;
      margin-top: 32px;
    }
    /* Footer */
    .footer {
      background: var(--bg-dark);
      color: #aaa;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
    }
    @media (max-width: 1024px) {
      .footer-grid { grid-template-columns: repeat(2,1fr); }
      .solution-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero h1 { font-size: 32px; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero-content { flex-direction: column; text-align: center; }
      .btn-group { justify-content: center; }
    }