/* roulang page: index */
:root {
      --deep-purple: #2D1B2E;
      --champagne-gold: #C9A96E;
      --warm-white: #FAF7F2;
      --text-primary: #1C1C1C;
      --text-secondary: #4A3F3F;
      --terracotta: #B5443C;
      --terracotta-hover: #9B3028;
      --card-bg: #FFFFFF;
      --border-light: #E8E3DC;
      --bg-light-gray: #F5F0E9;
      --shadow-sm: 0 2px 12px rgba(45,27,46,0.06);
      --shadow-md: 0 8px 24px rgba(45,27,46,0.12);
      --radius-card: 8px;
      --radius-btn: 6px;
      --transition: 0.25s ease;
      --font-serif: 'Noto Serif SC', 'DM Serif Display', serif;
      --font-sans: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --max-width: 1200px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--warm-white);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

    /* 导航基础 */
    .nav-brand-row {
      background: #FFFFFF;
      padding: 16px 0;
      border-bottom: 1px solid var(--border-light);
    }
    .brand-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      font-family: var(--font-serif);
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--deep-purple);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }
    .logo .gold-line {
      width: 4px;
      height: 28px;
      background: var(--champagne-gold);
      border-radius: 2px;
      display: inline-block;
    }
    .header-contacts {
      display: flex;
      align-items: center;
      gap: 24px;
      color: var(--text-secondary);
      font-size: 0.9rem;
    }
    .header-contacts i {
      color: var(--champagne-gold);
      margin-right: 6px;
    }
    .channel-nav {
      background: #FFFFFF;
      border-bottom: 1px solid var(--border-light);
      position: sticky;
      top: 0;
      z-index: 40;
      box-shadow: 0 1px 4px rgba(0,0,0,0.02);
    }
    .channel-tags {
      display: flex;
      flex-wrap: nowrap;
      overflow-x: auto;
      gap: 8px;
      padding: 12px 0;
      white-space: nowrap;
      -webkit-overflow-scrolling: touch;
    }
    .channel-tags a {
      font-family: var(--font-sans);
      font-size: 0.85rem;
      font-weight: 600;
      letter-spacing: 1px;
      color: var(--text-secondary);
      text-decoration: none;
      padding: 8px 16px;
      border-radius: 20px;
      transition: var(--transition);
      display: inline-block;
    }
    .channel-tags a.active, .channel-tags a:hover {
      color: var(--deep-purple);
      background: rgba(201,169,110,0.1);
    }
    .channel-tags a.active {
      border-bottom: 3px solid var(--champagne-gold);
      border-radius: 0;
      background: transparent;
    }

    /* 汉堡菜单仅移动端使用简单处理 */
    @media (max-width: 640px) {
      .channel-tags {
        gap: 4px;
      }
      .channel-tags a {
        padding: 6px 12px;
        font-size: 0.75rem;
      }
      .header-contacts span {
        display: none;
      }
    }

    /* Hero 区域 */
    .hero {
      padding: 60px 0 80px;
      background-color: var(--warm-white);
      position: relative;
      overflow: hidden;
    }
    .hero::after {
      content: "";
      position: absolute;
      right: -40px;
      top: 20px;
      width: 500px;
      height: 500px;
      background: radial-gradient(circle at 30% 30%, rgba(201,169,110,0.08) 0%, transparent 70%);
      border-radius: 50%;
      z-index: 0;
    }
    .hero-content {
      display: flex;
      align-items: center;
      gap: 60px;
      position: relative;
      z-index: 2;
    }
    .hero-left {
      flex: 1 1 50%;
    }
    .hero-right {
      flex: 1 1 50%;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    h1 {
      font-family: var(--font-serif);
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.3;
      color: var(--deep-purple);
      margin-bottom: 1rem;
    }
    .hero-sub {
      font-size: 1.1rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
      max-width: 90%;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--terracotta);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      text-decoration: none;
      transition: var(--transition);
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--terracotta-hover);
      color: white;
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--champagne-gold);
      color: var(--deep-purple);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: var(--champagne-gold);
      color: white;
    }
    .data-card {
      background: rgba(255,255,255,0.75);
      backdrop-filter: blur(2px);
      border-radius: var(--radius-card);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
      display: flex;
      align-items: center;
      gap: 20px;
    }
    .data-number {
      font-family: 'DM Serif Display', var(--font-serif);
      font-size: 3rem;
      font-weight: 400;
      color: var(--terracotta);
      line-height: 1;
    }
    .data-label {
      font-size: 0.9rem;
      color: var(--text-secondary);
    }

    /* 通用板块 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-family: var(--font-serif);
      font-size: 2.2rem;
      font-weight: 600;
      color: var(--deep-purple);
      margin-bottom: 16px;
      text-align: center;
    }
    .section-sub {
      color: var(--text-secondary);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 48px;
    }

    /* 指标看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .metric-item {
      text-align: center;
      padding: 24px 12px;
      border-bottom: 1px solid var(--border-light);
      transition: var(--transition);
    }
    .metric-item:hover {
      border-bottom: 2px solid var(--champagne-gold);
    }
    .metric-icon {
      font-size: 2rem;
      color: var(--champagne-gold);
      margin-bottom: 12px;
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      text-align: center;
    }
    .service-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .service-icon {
      width: 80px;
      height: 80px;
      background: #F5F0E9;
      border-radius: 50%;
      margin: 0 auto 24px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 2rem;
      color: var(--deep-purple);
      transition: var(--transition);
    }
    .service-card:hover .service-icon {
      background: rgba(201,169,110,0.2);
    }

    /* Before/After */
    .compare-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 0;
      background: var(--bg-light-gray);
      border-radius: var(--radius-card);
      overflow: hidden;
    }
    .compare-col {
      padding: 40px;
    }
    .compare-before {
      background: #EDE7DB;
    }
    .compare-after {
      background: #FFFFFF;
    }
    .compare-item {
      display: flex;
      justify-content: space-between;
      margin-bottom: 16px;
    }

    /* 案例墙 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .case-card:hover {
      box-shadow: var(--shadow-md);
    }
    .case-img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      transition: transform 0.3s;
    }
    .case-card:hover .case-img {
      transform: scale(1.03);
    }
    .case-tag {
      font-size: 0.75rem;
      border: 1px solid var(--champagne-gold);
      color: var(--champagne-gold);
      padding: 4px 12px;
      border-radius: 20px;
    }

    /* FAQ */
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
    }
    .accordion-title {
      font-weight: 600;
      padding: 18px 0;
      display: flex;
      align-items: center;
      gap: 12px;
      cursor: pointer;
      color: var(--text-primary);
    }

    /* 表单 */
    .cta-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 48px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
    }

    /* 页脚 */
    .footer {
      background: var(--deep-purple);
      color: var(--champagne-gold);
      padding: 60px 0 20px;
    }
    .footer a {
      color: var(--champagne-gold);
      text-decoration: none;
    }
    .footer a:hover {
      color: white;
    }

    @media (max-width: 1024px) {
      .hero-content { flex-direction: column; }
      .metrics-grid { grid-template-columns: repeat(2,1fr); }
      .services-grid, .case-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 640px) {
      .services-grid, .case-grid, .metrics-grid { grid-template-columns: 1fr; }
      .compare-wrapper { grid-template-columns: 1fr; }
      h1 { font-size: 2.4rem; }
    }