/* roulang page: index */
:root {
      --bronze-deep: #0B2B26;
      --champagne-gold: #C9A96E;
      --warm-ivory: #F9F7F4;
      --pure-white: #FFFFFF;
      --soft-gray: #F0EDE8;
      --text-dark: #1A1A1A;
      --text-muted: #666666;
      --text-light-on-dark: #E0E0E0;
      --border-light: rgba(0,0,0,0.05);
      --border-gold: rgba(201, 169, 110, 0.5);
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.02);
      --shadow-hover: 0 12px 30px rgba(0,0,0,0.08);
      --radius-card: 8px;
      --radius-btn: 4px;
      --font-serif: 'DM Serif Display', 'Noto Serif SC', serif;
      --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --transition-base: 0.3s ease;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--warm-ivory);
      color: var(--text-dark);
      line-height: 1.8;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }
    
    h1, h2, h3, h4 {
      font-weight: 600;
      letter-spacing: -0.3px;
    }
    
    h1 {
      font-weight: 700;
      font-size: 3rem;
      color: var(--bronze-deep);
    }
    
    h2 {
      font-weight: 600;
      font-size: 2.2rem;
      color: var(--text-dark);
      margin-bottom: 1rem;
    }
    
    .section-subtitle {
      font-weight: 400;
      font-size: 1.1rem;
      color: var(--text-muted);
      line-height: 1.8;
    }
    
    .container-custom {
      width: 100%;
      padding-right: 1.5rem;
      padding-left: 1.5rem;
      margin-right: auto;
      margin-left: auto;
      max-width: 1200px;
    }
    
    /* 顶部信息条 */
    .top-bar {
      background-color: var(--bronze-deep);
      color: var(--champagne-gold);
      font-size: 0.85rem;
      padding: 0.5rem 0;
      border-bottom: 1px solid rgba(201,169,110,0.2);
    }
    .top-bar a {
      color: var(--champagne-gold);
      text-decoration: none;
      margin-left: 1.5rem;
      transition: opacity 0.2s;
    }
    .top-bar a:hover {
      opacity: 0.8;
    }
    
    /* 主导航 */
    .navbar-custom {
      background-color: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      padding: 0.8rem 0;
      transition: all 0.3s;
    }
    .navbar-brand {
      font-family: var(--font-sans);
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--bronze-deep) !important;
      display: flex;
      align-items: center;
      gap: 0.5rem;
      text-decoration: none;
    }
    .logo-icon {
      font-size: 2rem;
      color: var(--champagne-gold);
    }
    .nav-link-custom {
      color: #2C2C2C !important;
      font-weight: 500;
      margin: 0 0.3rem;
      padding: 0.5rem 0.8rem !important;
      border-bottom: 2px solid transparent;
      transition: color 0.2s, border-color 0.2s;
    }
    .nav-link-custom:hover, .nav-link-custom.active {
      color: var(--champagne-gold) !important;
      border-bottom-color: var(--champagne-gold);
    }
    .navbar-toggler {
      border: none;
      color: var(--bronze-deep);
    }
    .navbar-toggler:focus {
      box-shadow: none;
    }
    
    /* 按钮系统 */
    .btn-primary-custom {
      background-color: var(--bronze-deep);
      border: 2px solid var(--bronze-deep);
      color: var(--champagne-gold);
      font-weight: 600;
      padding: 0.75rem 2.2rem;
      border-radius: var(--radius-btn);
      transition: all var(--transition-base);
      letter-spacing: 0.5px;
      display: inline-block;
      text-decoration: none;
    }
    .btn-primary-custom:hover {
      background-color: var(--champagne-gold);
      border-color: var(--champagne-gold);
      color: var(--bronze-deep);
    }
    .btn-outline-custom {
      background-color: transparent;
      border: 2px solid var(--bronze-deep);
      color: var(--bronze-deep);
      font-weight: 600;
      padding: 0.75rem 2.2rem;
      border-radius: var(--radius-btn);
      transition: all var(--transition-base);
      display: inline-block;
      text-decoration: none;
    }
    .btn-outline-custom:hover {
      background-color: var(--bronze-deep);
      border-color: var(--bronze-deep);
      color: var(--warm-ivory);
    }
    
    /* Hero区域 */
    #hero {
      padding: 4rem 0 5rem;
      background-color: var(--warm-ivory);
    }
    .hero-image-wrapper {
      position: relative;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      background: var(--soft-gray);
    }
    .hero-image-wrapper img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.5s;
    }
    .hero-image-wrapper:hover img {
      transform: scale(1.02);
    }
    
    /* 数据亮点卡 */
    #highlights {
      padding: 5rem 0;
    }
    .highlight-card {
      background: var(--pure-white);
      border-radius: var(--radius-card);
      padding: 2.2rem 1.8rem;
      box-shadow: var(--shadow-card);
      text-align: center;
      border-top: 3px solid var(--champagne-gold);
      transition: all var(--transition-base);
      height: 100%;
    }
    .highlight-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .highlight-number {
      font-family: var(--font-serif);
      font-size: 2.8rem;
      font-weight: 400;
      color: var(--champagne-gold);
      line-height: 1.2;
      margin-bottom: 0.5rem;
    }
    .highlight-title {
      font-weight: 600;
      font-size: 1.2rem;
      margin-bottom: 0.7rem;
    }
    .highlight-desc {
      color: var(--text-muted);
      font-size: 0.95rem;
    }
    
    /* 案例卡片 */
    #cases {
      padding: 5rem 0;
    }
    .case-card {
      background: var(--pure-white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: all var(--transition-base);
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .case-img-wrap {
      overflow: hidden;
      height: 200px;
    }
    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s;
    }
    .case-card:hover .case-img-wrap img {
      transform: scale(1.05);
    }
    .case-content {
      padding: 1.5rem;
      flex: 1;
    }
    .case-tag {
      font-size: 0.8rem;
      color: var(--bronze-deep);
      font-weight: 600;
      letter-spacing: 0.5px;
      margin-bottom: 0.5rem;
      display: block;
    }
    
    /* 方案对比 */
    #solutions {
      padding: 5rem 0;
    }
    .compare-card {
      background: var(--pure-white);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-card);
      height: 100%;
    }
    .compare-left {
      border-left: 4px solid #B0B0B0;
      background: #F5F4F1;
    }
    .compare-right {
      border-left: 4px solid var(--champagne-gold);
      background: var(--pure-white);
    }
    .compare-icon {
      color: var(--champagne-gold);
      margin-right: 0.5rem;
    }
    .compare-icon.fail {
      color: #A0A0A0;
    }
    
    /* FAQ */
    #faq {
      padding: 5rem 0;
    }
    .accordion-button {
      background-color: var(--warm-ivory);
      border: 1px solid var(--border-light);
      font-weight: 600;
      color: var(--text-dark);
      box-shadow: none;
      transition: 0.2s;
    }
    .accordion-button:not(.collapsed) {
      background-color: var(--pure-white);
      border-left: 4px solid var(--champagne-gold);
      color: var(--bronze-deep);
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: var(--champagne-gold);
    }
    
    /* 联系表单 */
    #contact {
      padding: 5rem 0;
      background-color: var(--bronze-deep);
      color: var(--text-light-on-dark);
    }
    .form-control-custom {
      background: transparent;
      border: none;
      border-bottom: 2px solid rgba(255,255,255,0.3);
      border-radius: 0;
      color: white;
      padding: 0.8rem 0;
      transition: border-color 0.2s;
    }
    .form-control-custom:focus {
      background: transparent;
      border-bottom-color: var(--champagne-gold);
      box-shadow: none;
      color: white;
    }
    .form-control-custom::placeholder {
      color: rgba(255,255,255,0.6);
    }
    
    /* 页脚 */
    footer {
      background-color: #09211D;
      color: var(--champagne-gold);
      padding: 3rem 0 1.5rem;
    }
    footer a {
      color: var(--champagne-gold);
      text-decoration: none;
      transition: color 0.2s;
    }
    footer a:hover {
      color: #E5D09A;
    }
    
    @media (max-width: 768px) {
      h1 {
        font-size: 2.2rem;
      }
      h2 {
        font-size: 1.8rem;
      }
      #hero {
        text-align: center;
        padding: 2rem 0 3rem;
      }
      .hero-image-wrapper {
        margin-top: 2rem;
      }
      .highlight-number {
        font-size: 2.2rem;
      }
      .navbar-collapse {
        background: rgba(255,255,255,0.98);
        padding: 1rem;
        border-radius: 8px;
        margin-top: 0.5rem;
      }
    }