/* roulang page: index */
:root {
      --primary: #E94E1B;
      --primary-dark: #C43E14;
      --secondary: #1A2A1F;
      --secondary-light: #2A3A2F;
      --accent: #D4A843;
      --bg: #FAF8F5;
      --bg-white: #FFFFFF;
      --text: #2C2C2C;
      --text-secondary: #6B6B6B;
      --text-light: #F5F0EB;
      --border-light: #E8E4DF;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 12px 24px rgba(0,0,0,0.08);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --transition: 0.25s ease;
      --font-title: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-body: "Inter", "Noto Sans SC", "PingFang SC", sans-serif;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航栏 - 白底平台导航 */
    .nav {
      position: sticky;
      top: 0;
      background: var(--bg-white);
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
      z-index: 1000;
      height: 72px;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 24px;
      color: var(--secondary);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: -0.5px;
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 700;
      font-size: 18px;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      text-decoration: none;
      color: var(--text);
      font-weight: 500;
      font-size: 16px;
      transition: color var(--transition);
      position: relative;
      padding: 4px 0;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width var(--transition);
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .nav-cta {
      background: var(--primary);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      text-decoration: none;
      transition: background var(--transition), transform 0.2s;
      font-size: 16px;
      letter-spacing: 0.5px;
    }

    .nav-cta:hover {
      background: var(--primary-dark);
      transform: scale(1.02);
      color: white;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .hamburger span {
      display: block;
      width: 28px;
      height: 3px;
      background: var(--text);
      border-radius: 4px;
      transition: var(--transition);
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      right: 0;
      bottom: 0;
      background: var(--bg-white);
      flex-direction: column;
      padding: 32px 24px;
      gap: 28px;
      z-index: 999;
      overflow-y: auto;
    }

    .mobile-menu.active {
      display: flex;
    }

    .mobile-menu a {
      font-size: 22px;
      font-weight: 600;
      color: var(--text);
      text-decoration: none;
      padding: 12px 0;
      border-bottom: 1px solid var(--border-light);
    }

    /* 首屏 Hero */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background-image: linear-gradient(rgba(26,42,31,0.7), rgba(26,42,31,0.75)), url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      color: var(--text-light);
      position: relative;
      padding: 120px 0 80px;
    }

    .hero-content {
      max-width: 700px;
    }

    .hero h1 {
      font-family: var(--font-title);
      font-size: clamp(36px, 7vw, 60px);
      font-weight: 800;
      letter-spacing: -0.5px;
      line-height: 1.2;
      margin-bottom: 20px;
      color: white;
    }

    .hero-sub {
      font-size: 20px;
      margin-bottom: 32px;
      opacity: 0.9;
      color: #F5F0EB;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      font-size: 18px;
      letter-spacing: 0.5px;
      cursor: pointer;
      text-decoration: none;
      transition: background var(--transition), transform 0.2s;
      display: inline-block;
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: scale(1.02);
    }

    .btn-secondary {
      background: transparent;
      color: white;
      border: 2px solid white;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      font-size: 18px;
      cursor: pointer;
      text-decoration: none;
      transition: background var(--transition), color var(--transition);
      display: inline-block;
    }

    .btn-secondary:hover {
      background: white;
      color: var(--secondary);
    }

    .btn-gold {
      background: var(--accent);
      color: var(--secondary);
      font-weight: 700;
    }

    .btn-gold:hover {
      background: #c99b34;
    }

    /* 区块通用 */
    section {
      padding: 100px 0;
    }

    .section-title {
      font-family: var(--font-title);
      font-size: clamp(28px, 5vw, 42px);
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--secondary);
      position: relative;
      display: inline-block;
    }

    .section-title::after {
      content: '';
      display: block;
      width: 60px;
      height: 4px;
      background: var(--primary);
      margin-top: 12px;
      border-radius: 2px;
    }

    .section-desc {
      color: var(--text-secondary);
      font-size: 18px;
      max-width: 600px;
      margin-bottom: 48px;
    }

    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .pain-card {
      background: var(--bg-white);
      padding: 32px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      border-left: 4px solid var(--primary);
    }

    /* 核心优势 - 非对称布局 */
    .advantage-grid {
      display: grid;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 28px;
    }

    .advantage-item {
      background: white;
      border-radius: var(--radius-md);
      padding: 40px 32px;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      position: relative;
    }

    .advantage-item:nth-child(1) { grid-row: span 2; }
    .advantage-item:nth-child(2) { grid-column: span 2; }
    .advantage-item:nth-child(3) { grid-column: span 2; }
    .advantage-item:nth-child(4) { grid-row: span 2; }

    .advantage-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }

    .advantage-icon {
      font-size: 36px;
      margin-bottom: 16px;
    }

    /* 服务产品 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .service-card {
      background: white;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
    }

    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }

    .service-img {
      height: 180px;
      background-color: #E8E4DF;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--text-secondary);
    }

    .service-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .service-body {
      padding: 20px;
    }

    .tag {
      background: #fde7df;
      color: var(--primary);
      padding: 4px 10px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 8px;
    }

    /* 数据区 */
    .stats {
      background: var(--secondary);
      color: var(--text-light);
      text-align: center;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
    }

    .stat-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--accent);
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .testimonial-card {
      background: white;
      padding: 28px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
    }

    .avatar {
      width: 48px;
      height: 48px;
      background: #f1e4d1;
      border-radius: 50%;
      margin-bottom: 16px;
    }

    .stars {
      color: var(--accent);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }

    .faq-question {
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      transition: color var(--transition);
    }

    .faq-question:hover {
      color: var(--primary);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }

    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }

    /* CTA */
    .cta-section {
      background: var(--secondary);
      color: white;
      text-align: center;
    }

    /* 页脚 */
    .footer {
      background: var(--secondary);
      color: var(--text-light);
      padding: 60px 0 0;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    .copyright {
      background: #141E17;
      color: #8A8A8A;
      text-align: center;
      padding: 16px;
      font-size: 13px;
      margin-top: 40px;
    }

    @media (max-width: 1024px) {
      .service-grid { grid-template-columns: repeat(2, 1fr); }
      .advantage-grid { grid-template-columns: 1fr; }
      .advantage-item:nth-child(n) { grid-row: auto; grid-column: auto; }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
      .testimonial-grid { grid-template-columns: 1fr; }
      .pain-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero { padding: 100px 0 60px; }
      section { padding: 60px 0; }
      .service-grid { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: 1fr; }
    }