/* roulang page: index */
:root {
      --primary: #E67E22;
      --primary-dark: #D35400;
      --secondary: #2C3E50;
      --accent: #27AE60;
      --bg: #FAF9F6;
      --card-bg: #FFFFFF;
      --border-light: #E8E5DF;
      --text-primary: #2C3E50;
      --text-secondary: #5D6D7E;
      --text-on-primary: #FFFFFF;
      --text-footer: #EAECEE;
      --radius-lg: 16px;
      --radius-xl: 40px;
      --radius-sm: 12px;
      --shadow-card: 0 4px 20px rgba(44,62,80,0.06);
      --shadow-card-hover: 0 12px 32px rgba(44,62,80,0.12);
      --transition: all 0.3s ease;
      --container: 1280px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Inter', system-ui, -apple-system, sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
      scroll-padding-top: 100px;
    }

    body {
      background-color: var(--bg);
      color: var(--text-primary);
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Inter', system-ui, -apple-system, sans-serif;
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    .container {
      max-width: var(--container);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 悬浮胶囊导航 */
    .navbar {
      position: fixed;
      top: 16px;
      left: 50%;
      transform: translateX(-50%);
      width: auto;
      max-width: 600px;
      background: rgba(255,255,255,0.75);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: 40px;
      padding: 8px 24px;
      box-shadow: 0 8px 24px rgba(44,62,80,0.08);
      z-index: 1000;
      display: flex;
      align-items: center;
      justify-content: space-between;
      border: 1px solid rgba(232,229,223,0.4);
    }

    .nav-logo {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--secondary);
      letter-spacing: 1px;
      white-space: nowrap;
      margin-right: 32px;
    }

    .nav-logo span {
      color: var(--primary);
    }

    .nav-links {
      display: flex;
      gap: 24px;
      align-items: center;
      list-style: none;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--secondary);
      position: relative;
      padding: 6px 0;
      transition: var(--transition);
      font-size: 0.95rem;
    }

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

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }

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

    /* 移动端底部导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-top: 1px solid var(--border-light);
      padding: 8px 16px;
      justify-content: space-around;
      align-items: center;
      z-index: 1000;
      border-radius: 32px 32px 0 0;
      box-shadow: 0 -4px 20px rgba(0,0,0,0.04);
    }

    .mobile-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 12px;
      color: var(--secondary);
      gap: 4px;
      font-weight: 500;
    }

    .mobile-nav a i {
      font-size: 20px;
    }

    .mobile-nav a.active {
      color: var(--primary);
    }

    /* Hero */
    .hero {
      padding: 140px 0 100px;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #FAF9F6 0%, #F2EFE9 100%);
      position: relative;
      overflow: hidden;
    }

    .hero-content {
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }

    .hero-text {
      flex: 1 1 45%;
    }

    .hero-text h1 {
      font-size: 48px;
      font-weight: 600;
      line-height: 1.2;
      color: var(--secondary);
      margin-bottom: 20px;
    }

    .hero-text .highlight {
      color: var(--primary);
    }

    .hero-text p {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 36px;
      max-width: 500px;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn {
      display: inline-block;
      padding: 14px 32px;
      border-radius: 40px;
      font-weight: 600;
      font-size: 16px;
      transition: var(--transition);
      text-align: center;
      cursor: pointer;
      border: none;
      background: transparent;
    }

    .btn-primary {
      background: var(--primary);
      color: var(--text-on-primary);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: scale(1.03);
    }

    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
    }

    .btn-outline:hover {
      background: rgba(230,126,34,0.08);
      transform: scale(1.03);
    }

    .hero-illustration {
      flex: 1 1 45%;
      position: relative;
    }

    .hero-illustration img {
      width: 100%;
      max-width: 550px;
      margin: 0 auto;
      filter: drop-shadow(0 20px 30px rgba(44,62,80,0.08));
    }

    .floating-dots {
      position: absolute;
      width: 60px;
      height: 60px;
      background: rgba(230,126,34,0.1);
      border-radius: 50%;
      animation: float 6s infinite ease-in-out;
      top: 10%;
      right: 5%;
    }

    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-15px); }
      100% { transform: translateY(0px); }
    }

    section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 36px;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--secondary);
    }

    .section-subtitle {
      color: var(--text-secondary);
      max-width: 680px;
      margin-bottom: 48px;
      font-size: 18px;
    }

    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: var(--card-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

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

    .service-icon {
      font-size: 32px;
      color: var(--primary);
      margin-bottom: 20px;
    }

    .service-card h3 {
      font-size: 22px;
      margin-bottom: 12px;
    }

    .service-card p {
      color: var(--text-secondary);
      margin-bottom: 24px;
      flex: 1;
    }

    .arrow-link {
      color: var(--primary);
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 6px;
    }

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

    .stat-item {
      text-align: left;
      background: var(--card-bg);
      padding: 28px 24px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
    }

    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.1;
    }

    .stat-label {
      color: var(--text-secondary);
      margin-top: 8px;
    }

    /* 案例非对称 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      overflow: hidden;
      display: flex;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }

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

    .case-img {
      width: 45%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .case-card:hover .case-img {
      transform: scale(1.03);
    }

    .case-info {
      padding: 28px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .case-info h3 {
      font-size: 20px;
      margin-bottom: 10px;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--card-bg);
      border-radius: var(--radius-sm);
      margin-bottom: 16px;
      border: 1px solid var(--border-light);
      overflow: hidden;
    }

    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: #F8F6F2;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.3s;
      background: white;
      padding: 0 24px;
      color: var(--text-secondary);
    }

    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 20px 24px;
    }

    /* 联系 */
    .contact-form {
      background: var(--card-bg);
      padding: 48px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      max-width: 600px;
      margin: 0 auto;
    }

    .input-field {
      width: 100%;
      padding: 14px 0;
      border: none;
      border-bottom: 2px solid var(--border-light);
      background: transparent;
      margin-bottom: 28px;
      font-size: 16px;
      outline: none;
      transition: border 0.2s;
    }

    .input-field:focus {
      border-bottom: 2px solid var(--primary);
    }

    .btn-full {
      width: 100%;
    }

    /* 页脚 */
    .footer {
      background: var(--secondary);
      color: var(--text-footer);
      padding: 60px 0 30px;
    }

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

    .footer-logo {
      font-size: 1.8rem;
      font-weight: 700;
      margin-bottom: 12px;
    }

    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: repeat(2,1fr); }
    }

    @media (max-width: 768px) {
      .navbar { display: none; }
      .mobile-nav { display: flex; }
      .hero-content { flex-direction: column; }
      .hero-text h1 { font-size: 36px; }
      .services-grid,
      .cases-grid { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
      .case-card { flex-direction: column; }
      .case-img { width: 100%; height: 200px; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      section { padding: 64px 0; }
    }