/* roulang page: index */
:root {
      --primary: #C8A45C;
      --primary-hover: #B8943D;
      --secondary: #2C3E50;
      --bg-warm: #FAF9F6;
      --card-bg: #FFFFFF;
      --accent: #E74C3C;
      --border-light: #E8E5DF;
      --text-main: #1A1A1A;
      --text-secondary: #5A5A5A;
      --text-muted: #8A8A8A;
      --white: #FFFFFF;
      --hero-dark-start: #1A1A1A;
      --hero-dark-end: #2C3E50;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.10);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-large: 10px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
      --container-max: 1200px;
      --section-gap: 100px;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    html {
      scroll-behavior: smooth;
    }
    
    body {
      font-family: var(--font-sans);
      font-size: 16px;
      line-height: 1.6;
      color: var(--text-main);
      background-color: var(--bg-warm);
      -webkit-font-smoothing: antialiased;
    }
    
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
      z-index: 1000;
      transition: background 0.3s ease, box-shadow 0.3s ease, color 0.3s ease;
      background: transparent;
      color: var(--white);
    }
    
    .navbar.scrolled {
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.05);
      color: var(--secondary);
    }
    
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: 0.5px;
      text-decoration: none;
      color: inherit;
      white-space: nowrap;
    }
    
    .logo i {
      color: var(--primary);
      font-size: 1.8rem;
      text-shadow: 0 2px 5px rgba(0,0,0,0.2);
    }
    
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    
    .nav-links a {
      text-decoration: none;
      color: inherit;
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 6px 0;
      transition: color 0.2s;
    }
    
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 3px;
      background: var(--primary);
      transition: width 0.2s ease;
    }
    
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    
    .hamburger {
      display: none;
      font-size: 1.8rem;
      cursor: pointer;
      background: none;
      border: none;
      color: inherit;
    }
    
    /* Hero */
    .hero {
      height: 100vh;
      min-height: 650px;
      background: linear-gradient(135deg, var(--hero-dark-start) 0%, var(--hero-dark-end) 100%);
      display: flex;
      align-items: center;
      color: var(--white);
      position: relative;
      overflow: hidden;
    }
    
    .hero .container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
      width: 100%;
    }
    
    .hero-content h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    
    .hero-content h1 span {
      color: var(--primary);
    }
    
    .hero-subtitle {
      font-size: 1.1rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
      max-width: 450px;
    }
    
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: all 0.25s ease;
      cursor: pointer;
      border: none;
      font-size: 1rem;
    }
    
    .btn-primary {
      background: var(--primary);
      color: #1A1A1A;
      box-shadow: 0 4px 10px rgba(200,164,92,0.3);
    }
    
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(184,148,61,0.4);
    }
    
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
    }
    
    .btn-outline:hover {
      background: var(--primary);
      color: #1A1A1A;
    }
    
    .hero-image {
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    
    .hero-image img {
      max-width: 100%;
      height: auto;
      border-radius: 24px;
      filter: drop-shadow(0 20px 30px rgba(0,0,0,0.5));
      opacity: 0.9;
    }
    
    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      font-size: 2rem;
      color: var(--primary);
      animation: bounce 2s infinite;
    }
    
    @keyframes bounce {
      0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
      40% { transform: translateX(-50%) translateY(-10px); }
      60% { transform: translateX(-50%) translateY(-5px); }
    }
    
    /* 通用区块 */
    .section {
      padding: var(--section-gap) 0;
    }
    
    .section h2 {
      font-size: 2.25rem;
      font-weight: 600;
      text-align: center;
      margin-bottom: 16px;
      color: var(--secondary);
    }
    
    .section-subtitle {
      text-align: center;
      color: var(--text-secondary);
      margin-bottom: 48px;
      font-size: 1.1rem;
    }
    
    /* 优势卡片 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    
    .adv-card {
      background: var(--card-bg);
      padding: 32px 24px;
      border-radius: 8px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      border: 1px solid var(--border-light);
    }
    
    .adv-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    
    .adv-number {
      font-size: 3.5rem;
      font-weight: 800;
      color: var(--accent);
      line-height: 1.2;
    }
    
    .adv-label {
      font-weight: 600;
      margin-top: 8px;
      color: var(--secondary);
    }
    
    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      border: 1px solid var(--border-light);
      display: flex;
      flex-direction: column;
    }
    
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    
    .service-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }
    
    .service-body {
      padding: 20px 20px 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    
    .service-body h3 {
      font-size: 1.25rem;
      margin-bottom: 8px;
    }
    
    .service-body p {
      color: var(--text-secondary);
      font-size: 0.9rem;
      margin-bottom: 16px;
      flex: 1;
    }
    
    .arrow-link {
      align-self: flex-end;
      color: var(--primary);
      font-size: 1.2rem;
      transition: transform 0.2s;
    }
    
    .service-card:hover .arrow-link {
      transform: translateX(6px);
    }
    
    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      text-align: center;
      position: relative;
      margin-top: 30px;
    }
    
    .step {
      display: flex;
      flex-direction: column;
      align-items: center;
      z-index: 2;
      background: var(--bg-warm);
      padding: 0 16px;
    }
    
    .step-num {
      width: 48px;
      height: 48px;
      background: var(--primary);
      color: #1A1A1A;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.3rem;
      margin-bottom: 12px;
      transition: 0.2s;
    }
    
    .step:hover .step-num {
      transform: scale(1.1);
      box-shadow: 0 6px 14px rgba(200,164,92,0.4);
    }
    
    .step h3 {
      font-size: 1.1rem;
      margin-bottom: 4px;
    }
    
    .step p {
      color: var(--text-secondary);
      font-size: 0.85rem;
    }
    
    .process-line {
      position: absolute;
      top: 24px;
      left: 10%;
      width: 80%;
      height: 2px;
      border-top: 2px dashed var(--border-light);
      z-index: 1;
    }
    
    /* 案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    
    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      border: 1px solid var(--border-light);
    }
    
    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    
    .case-img {
      height: 240px;
      background-size: cover;
      background-position: center;
    }
    
    .case-content {
      padding: 24px;
    }
    
    .case-tag {
      font-weight: 600;
      color: var(--secondary);
      margin-bottom: 8px;
    }
    
    .case-quote {
      font-style: italic;
      color: var(--text-secondary);
      margin-bottom: 12px;
    }
    
    .stars {
      color: var(--primary);
    }
    
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
    }
    
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 1.1rem;
      cursor: pointer;
      color: var(--secondary);
    }
    
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.2s;
      color: var(--text-secondary);
      font-size: 0.95rem;
      background: #F5F4F0;
      border-radius: 6px;
      margin-top: 6px;
    }
    
    .faq-item.active .faq-answer {
      max-height: 120px;
      padding: 12px 16px;
    }
    
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }
    
    .faq-icon {
      transition: transform 0.2s;
    }
    
    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #F5F0E6 0%, #FAF9F6 100%);
      text-align: center;
    }
    
    .cta-buttons {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
    }
    
    .btn-lg {
      padding: 16px 40px;
      border-radius: var(--radius-large);
      font-size: 1.1rem;
    }
    
    /* 页脚 */
    .footer {
      background: var(--secondary);
      color: #B0B0B0;
      padding: 60px 0 30px;
    }
    
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    
    .footer h4 {
      color: white;
      margin-bottom: 16px;
    }
    
    .footer a {
      color: #B0B0B0;
      text-decoration: none;
      display: block;
      margin-bottom: 8px;
    }
    
    .social-icons i {
      font-size: 1.6rem;
      margin-right: 16px;
      color: #B0B0B0;
      transition: color 0.2s;
    }
    
    .social-icons i:hover {
      color: var(--primary);
    }
    
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 0.9rem;
    }
    
    /* 移动端菜单 */
    @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: 0 10px 20px rgba(0,0,0,0.1);
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-content h1 {
        font-size: 2rem;
      }
      .advantages-grid,
      .services-grid,
      .cases-grid {
        grid-template-columns: 1fr;
      }
      .process-steps {
        flex-direction: column;
        align-items: center;
        gap: 30px;
      }
      .process-line {
        display: none;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }