/* roulang page: index */
:root {
      --primary-deep: #3E2C23;
      --accent-gold: #C8A96E;
      --bg-warm: #F9F7F4;
      --card-white: #FFFFFF;
      --text-primary: #2C241E;
      --text-secondary: #6B5E55;
      --text-inverse: #F9F7F4;
      --cta-wine: #7A2E3B;
      --border-light: #E5E0D9;
      --shadow-card: 0 4px 20px rgba(62,44,35,0.06);
      --shadow-hover: 0 12px 32px rgba(62,44,35,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --sidebar-width: 240px;
      --mobile-nav-height: 60px;
      --font-serif: "Noto Serif SC", "STSong", "Songti SC", "SimSun", serif;
      --font-sans: "Inter", "SF Pro Text", "PingFang SC", "Microsoft YaHei", sans-serif;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-primary);
      margin: 0;
      padding: 0;
      line-height: 1.75;
      display: flex;
      flex-direction: row;
      min-height: 100vh;
    }
    
    /* 左侧导航桌面样式 */
    .sidebar-nav {
      width: var(--sidebar-width);
      background-color: var(--primary-deep);
      color: var(--text-inverse);
      position: fixed;
      top: 0;
      left: 0;
      height: 100vh;
      display: flex;
      flex-direction: column;
      z-index: 100;
      box-shadow: 2px 0 15px rgba(0,0,0,0.15);
      transition: transform 0.3s ease;
    }
    
    .logo-area {
      padding: 2rem 1.5rem 1.5rem;
      border-bottom: 1px solid rgba(200,169,110,0.25);
    }
    
    .logo-text {
      font-family: var(--font-serif);
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--accent-gold);
      letter-spacing: 2px;
      line-height: 1.2;
    }
    
    .logo-sub {
      font-size: 0.75rem;
      color: #A3968A;
      letter-spacing: 1px;
      margin-top: 0.25rem;
    }
    
    .nav-links {
      flex: 1;
      display: flex;
      flex-direction: column;
      padding: 2rem 0;
      gap: 0.25rem;
    }
    
    .nav-link {
      display: block;
      color: var(--accent-gold);
      text-decoration: none;
      padding: 0.8rem 1.5rem;
      font-weight: 500;
      letter-spacing: 0.5px;
      transition: all 0.2s ease;
      border-left: 3px solid transparent;
      font-size: 0.95rem;
    }
    
    .nav-link:hover {
      background-color: rgba(255,255,255,0.05);
      color: #FFFFFF;
      border-left-color: var(--accent-gold);
    }
    
    .nav-link.active {
      color: #FFFFFF;
      background-color: rgba(200,169,110,0.1);
      border-left-color: var(--accent-gold);
    }
    
    .sidebar-footer {
      padding: 1.5rem;
      font-size: 0.75rem;
      color: #A3968A;
      border-top: 1px solid rgba(200,169,110,0.2);
    }
    
    /* 主内容区域 */
    .main-content {
      margin-left: var(--sidebar-width);
      width: calc(100% - var(--sidebar-width));
      background-color: var(--bg-warm);
    }
    
    /* 移动端顶部导航 */
    .mobile-header {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--mobile-nav-height);
      background-color: var(--primary-deep);
      z-index: 99;
      align-items: center;
      justify-content: space-between;
      padding: 0 1.25rem;
      box-shadow: 0 2px 10px rgba(0,0,0,0.2);
    }
    
    .mobile-logo {
      font-family: var(--font-serif);
      font-size: 1.4rem;
      color: var(--accent-gold);
      font-weight: 700;
    }
    
    .hamburger {
      color: var(--accent-gold);
      font-size: 1.8rem;
      cursor: pointer;
      background: none;
      border: none;
      line-height: 1;
    }
    
    /* 抽屉菜单 */
    .mobile-drawer {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background-color: var(--primary-deep);
      z-index: 150;
      transform: translateX(-100%);
      transition: transform 0.35s ease;
      display: flex;
      flex-direction: column;
      padding: 2rem 1.5rem;
    }
    
    .mobile-drawer.open {
      transform: translateX(0);
    }
    
    .drawer-close {
      align-self: flex-end;
      background: none;
      border: none;
      color: var(--accent-gold);
      font-size: 2rem;
      cursor: pointer;
    }
    
    .drawer-links {
      display: flex;
      flex-direction: column;
      gap: 1.2rem;
      margin-top: 3rem;
    }
    
    .drawer-link {
      color: var(--accent-gold);
      font-size: 1.5rem;
      text-decoration: none;
      font-weight: 500;
      border-bottom: 1px solid rgba(200,169,110,0.25);
      padding-bottom: 0.5rem;
    }
    
    /* 通用板块样式 */
    .section-padding {
      padding: 5rem 2rem;
    }
    
    .container-narrow {
      max-width: 1200px;
      margin: 0 auto;
    }
    
    h2.section-title {
      font-family: var(--font-serif);
      font-size: clamp(2rem, 3.5vw, 2.8rem);
      font-weight: 600;
      color: var(--text-primary);
      margin-bottom: 2.5rem;
      text-align: center;
    }
    
    /* 卡片基础 */
    .custom-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      height: 100%;
    }
    
    .custom-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    
    /* 按钮 */
    .btn-primary {
      background-color: var(--accent-gold);
      color: var(--primary-deep);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.75rem 2rem;
      transition: all 0.3s ease;
      border: none;
      cursor: pointer;
      display: inline-block;
      text-decoration: none;
    }
    
    .btn-primary:hover {
      background-color: var(--cta-wine);
      color: #FFFFFF;
    }
    
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--primary-deep);
      color: var(--primary-deep);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.7rem 1.8rem;
      transition: all 0.3s ease;
      cursor: pointer;
      display: inline-block;
      text-decoration: none;
    }
    
    .btn-secondary:hover {
      background-color: var(--primary-deep);
      color: var(--bg-warm);
    }
    
    /* Hero */
    .hero-section {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      color: #fff;
    }
    
    .hero-overlay {
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background: linear-gradient(135deg, rgba(62,44,35,0.8) 0%, rgba(62,44,35,0.35) 100%);
    }
    
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
      padding: 2rem;
    }
    
    .hero-content h1 {
      font-family: var(--font-serif);
      font-size: clamp(2.5rem, 5vw, 4rem);
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    
    .hero-sub {
      font-size: 1.1rem;
      color: var(--accent-gold);
      letter-spacing: 2px;
      margin-bottom: 2rem;
    }
    
    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    
    /* 服务图标 */
    .service-icon {
      font-size: 2.5rem;
      color: var(--accent-gold);
      margin-bottom: 1.2rem;
    }
    
    /* 统计数据 */
    .stat-number {
      font-family: var(--font-serif);
      font-size: clamp(2.5rem, 4vw, 3.5rem);
      font-weight: 700;
      color: var(--accent-gold);
    }
    
    /* 案例图片 */
    .case-img {
      width: 100%;
      height: 220px;
      object-fit: cover;
      border-radius: 12px 12px 0 0;
    }
    
    /* 解决方案图片 */
    .solution-img {
      width: 100%;
      border-radius: 12px;
      box-shadow: var(--shadow-card);
      height: auto;
    }
    
    /* FAQ */
    .faq-dark {
      background-color: var(--primary-deep);
    }
    
    .faq-item {
      border-bottom: 1px solid rgba(249,247,244,0.2);
      margin-bottom: 0;
    }
    
    .faq-question {
      background: transparent;
      color: var(--text-inverse);
      padding: 1.2rem 0;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: color 0.3s;
    }
    
    .faq-question.active {
      color: var(--accent-gold);
    }
    
    .faq-answer {
      color: #D6CDC4;
      padding-bottom: 1.2rem;
      display: none;
    }
    
    /* 表单 */
    .contact-form input, .contact-form textarea {
      background: #fff;
      border: 1px solid var(--border-light);
      border-radius: 8px;
      padding: 0.75rem;
      margin-bottom: 1rem;
      width: 100%;
    }
    
    .contact-form input:focus, .contact-form textarea:focus {
      border-color: var(--accent-gold);
      box-shadow: 0 0 0 3px rgba(200,169,110,0.2);
      outline: none;
    }
    
    /* 页脚 */
    .site-footer {
      background-color: #2C241E;
      color: #A3968A;
      padding: 3rem 2rem;
      text-align: center;
    }
    
    .footer-links a {
      color: var(--accent-gold);
      margin: 0 0.75rem;
      text-decoration: none;
    }
    
    .footer-links a:hover {
      color: #fff;
    }
    
    /* 响应式 */
    @media screen and (max-width: 1024px) {
      .sidebar-nav {
        display: none;
      }
      .mobile-header {
        display: flex;
      }
      .main-content {
        margin-left: 0;
        width: 100%;
        padding-top: var(--mobile-nav-height);
      }
      .section-padding {
        padding: 3rem 1.5rem;
      }
    }
    
    @media screen and (max-width: 640px) {
      .hero-content {
        padding: 1rem;
      }
      .custom-card {
        margin-bottom: 1.5rem;
      }
    }