/* roulang page: index */
:root {
      --bronze-deep: #2B1E10;
      --champagne-gold: #C8A96E;
      --light-bg: #F5F4F1;
      --charcoal: #1E1E1E;
      --warm-gray: #6B625A;
      --soft-gold: #E0D3B8;
      --pure-white: #FFFFFF;
      --input-bg: #F0EFEC;
      --border-light: rgba(43,30,16,0.08);
      --shadow-sm: 0 2px 12px rgba(43,30,16,0.06);
      --shadow-hover: 0 8px 24px rgba(43,30,16,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --transition: 0.25s ease;
      --nav-width: 240px;
      --font-serif: 'Noto Serif SC', serif;
      --font-sans: 'Noto Sans SC', sans-serif;
      --font-mono: 'DM Mono', monospace;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--light-bg);
      color: var(--charcoal);
      margin: 0;
      line-height: 1.5;
      overflow-x: hidden;
    }
    
    h1, h2, h3, h4, .serif-title {
      font-family: var(--font-serif);
      font-weight: 700;
      letter-spacing: -0.2px;
    }
    
    .mono-digit {
      font-family: var(--font-mono);
    }
    
    a {
      text-decoration: none;
      color: inherit;
    }
    
    img {
      max-width: 100%;
      height: auto;
    }
    
    /* 左侧竖向导航 */
    .vertical-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: var(--nav-width);
      height: 100vh;
      background-color: var(--bronze-deep);
      color: var(--champagne-gold);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      z-index: 1050;
      box-shadow: 2px 0 12px rgba(0,0,0,0.08);
      padding: 2rem 0 1.5rem;
      transition: transform 0.3s ease;
    }
    
    .nav-brand {
      padding: 0 1.8rem 1.8rem;
      border-bottom: 1px solid rgba(200,169,110,0.2);
      margin-bottom: 2rem;
    }
    
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    
    .brand-icon {
      font-size: 2.2rem;
      line-height: 1;
    }
    
    .brand-text {
      font-family: var(--font-serif);
      font-size: 1.5rem;
      font-weight: 700;
      letter-spacing: 2px;
      color: var(--champagne-gold);
    }
    
    .brand-domain {
      font-size: 0.7rem;
      color: rgba(200,169,110,0.7);
      letter-spacing: 0.5px;
      margin-top: 4px;
    }
    
    .nav-menu {
      list-style: none;
      padding: 0 1.2rem;
      margin: 0;
      flex: 1;
    }
    
    .nav-item {
      margin-bottom: 6px;
    }
    
    .nav-link {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 0.9rem 1.2rem;
      color: rgba(200,169,110,0.85);
      font-weight: 400;
      border-radius: 8px;
      transition: all var(--transition);
      font-size: 0.95rem;
      letter-spacing: 0.4px;
    }
    
    .nav-link i {
      width: 18px;
      font-size: 1rem;
    }
    
    .nav-link:hover, .nav-link.active {
      background-color: rgba(200,169,110,0.1);
      color: var(--champagne-gold);
      border-left: 3px solid var(--champagne-gold);
      padding-left: calc(1.2rem - 3px);
    }
    
    .nav-footer {
      padding: 1.2rem 1.8rem;
      font-size: 0.7rem;
      color: rgba(200,169,110,0.6);
      border-top: 1px solid rgba(200,169,110,0.15);
      margin-top: 1rem;
    }
    
    /* 主内容区偏移 */
    .main-content {
      margin-left: var(--nav-width);
      background-color: var(--light-bg);
    }
    
    /* 移动端顶部导航 */
    .mobile-nav {
      display: none;
      background-color: var(--bronze-deep);
      color: var(--champagne-gold);
      padding: 0.8rem 1.5rem;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1040;
      align-items: center;
      justify-content: space-between;
      box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    }
    
    .mobile-brand {
      display: flex;
      align-items: center;
      gap: 6px;
    }
    
    .hamburger {
      font-size: 1.5rem;
      background: none;
      border: none;
      color: var(--champagne-gold);
    }
    
    .mobile-menu {
      display: none;
      background-color: var(--bronze-deep);
      position: fixed;
      top: 60px;
      left: 0;
      width: 100%;
      z-index: 1030;
      padding: 1rem;
      flex-direction: column;
      border-top: 1px solid rgba(200,169,110,0.2);
    }
    
    .mobile-menu a {
      color: rgba(200,169,110,0.9);
      padding: 0.8rem;
      display: block;
      border-bottom: 1px solid rgba(200,169,110,0.1);
    }
    
    /* 板块通用 */
    .section-padding {
      padding: 100px 0;
    }
    
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 2rem;
    }
    
    .section-title {
      font-size: 2.25rem;
      margin-bottom: 1rem;
      color: var(--bronze-deep);
    }
    
    .section-subtitle {
      color: var(--warm-gray);
      font-size: 1.1rem;
      margin-bottom: 3rem;
    }
    
    /* 按钮 */
    .btn-gold {
      background-color: var(--champagne-gold);
      color: var(--bronze-deep);
      font-weight: 600;
      padding: 0.75rem 2rem;
      border-radius: var(--radius-btn);
      border: none;
      transition: all var(--transition);
      letter-spacing: 0.5px;
    }
    
    .btn-gold:hover {
      background-color: #b8944a;
      color: white;
    }
    
    .btn-bronze {
      background-color: var(--bronze-deep);
      color: var(--champagne-gold);
      border: 1px solid var(--champagne-gold);
      font-weight: 500;
      padding: 0.75rem 2rem;
      border-radius: var(--radius-btn);
      transition: all var(--transition);
    }
    
    .btn-bronze:hover {
      background-color: var(--champagne-gold);
      color: var(--bronze-deep);
    }
    
    /* Hero */
    #hero {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      min-height: 85vh;
      display: flex;
      align-items: center;
    }
    
    #hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(245,244,241,0.92) 0%, rgba(245,244,241,0.7) 70%);
      z-index: 1;
    }
    
    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    
    .hero-left {
      flex: 1 1 55%;
    }
    
    .hero-right {
      flex: 1 1 35%;
      display: flex;
      flex-direction: column;
      gap: 2rem;
    }
    
    .stat-item h3 {
      font-family: var(--font-mono);
      font-size: 2.5rem;
      color: var(--champagne-gold);
    }
    
    /* 卡片通用 */
    .card-custom {
      background: var(--pure-white);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
      border: 1px solid transparent;
      height: 100%;
    }
    
    .card-custom:hover {
      box-shadow: var(--shadow-hover);
      border-color: var(--soft-gold);
    }
    
    .dashboard-card {
      border-top: 4px solid var(--champagne-gold);
    }
    
    /* 服务非对称 */
    .service-large {
      background-image: url('/assets/images/coverpic/cover-2.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      color: white;
      min-height: 320px;
    }
    
    .service-large::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(43,30,16,0.75);
      border-radius: var(--radius-card);
    }
    
    .service-large .card-content {
      position: relative;
      z-index: 2;
    }
    
    /* 对比表 */
    .compare-item {
      display: flex;
      justify-content: space-between;
      padding: 1rem 0;
      border-bottom: 1px solid var(--border-light);
    }
    
    /* 横向滚动案例 */
    .cases-scroll {
      display: flex;
      gap: 20px;
      overflow-x: auto;
      padding-bottom: 1rem;
      scrollbar-width: none;
    }
    
    .cases-scroll::-webkit-scrollbar {
      display: none;
    }
    
    .case-card {
      min-width: 300px;
      max-width: 320px;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    
    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: transparent;
      color: var(--bronze-deep);
      border-left: 3px solid var(--champagne-gold);
    }
    
    /* 表单 */
    .form-control {
      background-color: var(--input-bg);
      border: 1px solid transparent;
      border-radius: var(--radius-input);
      padding: 0.8rem;
    }
    
    .form-control:focus {
      border-color: var(--champagne-gold);
      box-shadow: 0 0 0 0.2rem rgba(200,169,110,0.2);
    }
    
    /* 页脚 */
    footer {
      background-color: var(--bronze-deep);
      color: var(--champagne-gold);
    }
    
    @media (max-width: 991.98px) {
      .vertical-nav {
        display: none;
      }
      .mobile-nav {
        display: flex;
      }
      .main-content {
        margin-left: 0;
        padding-top: 60px;
      }
      #hero {
        min-height: 70vh;
      }
    }
    @media (max-width: 767px) {
      .hero-content {
        flex-direction: column;
      }
      .section-padding {
        padding: 60px 0;
      }
    }