/* ==========================================================================
   乾元执中（南京）科技有限公司 | 官方网站通用样式
   Qianyuan Zhizhong (Nanjing) Technology Co., Ltd.
   ========================================================================== */

:root {
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-subtle: #f1f5f9;
  --color-text-primary: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --color-border-subtle: #cbd5e1;
  --color-accent: #1e3a8a;
  --color-accent-hover: #1d4ed8;
  --color-accent-light: #eff6ff;
  --color-tag-bg: #e0f2fe;
  --color-tag-text: #0369a1;
  --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-family-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --container-max-width: 960px;
  --border-radius: 8px;
  --box-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --box-shadow-card: 0 4px 6px -1px rgb(0 0 0 / 0.05), 0 2px 4px -2px rgb(0 0 0 / 0.05);
}

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

html {
  font-size: 16px;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family-base);
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

/* 导航栏 Header / Nav */
.site-header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-nav {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.site-brand {
  display: flex;
  flex-direction: column;
}

.site-brand a {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text-primary);
  text-decoration: none;
  line-height: 1.3;
}

.site-brand .brand-en {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  font-weight: 400;
  letter-spacing: 0.02em;
}

.site-nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  align-items: center;
}

.site-nav-links a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.site-nav-links a:hover,
.site-nav-links a.active {
  color: var(--color-accent);
  text-decoration: none;
}

/* 主内容区 Layout */
.main-content {
  flex: 1;
  max-width: var(--container-max-width);
  width: 100%;
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
}

/* 英雄区 Hero Section */
.hero {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 3rem 2rem;
  margin-bottom: 2rem;
  box-shadow: var(--box-shadow-card);
}

.hero h1 {
  font-size: 1.875rem;
  font-weight: 800;
  color: var(--color-text-primary);
  line-height: 1.25;
  margin-bottom: 0.5rem;
}

.hero .company-en {
  font-size: 1rem;
  color: var(--color-text-muted);
  font-weight: 500;
  margin-bottom: 1.5rem;
}

.hero .badge {
  display: inline-block;
  background-color: var(--color-accent-light);
  color: var(--color-accent);
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.8125rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
}

.hero p {
  color: var(--color-text-secondary);
  font-size: 1.0625rem;
  line-height: 1.75;
  margin-bottom: 1rem;
}

/* 模块 Card 容器 */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 1.75rem;
  box-shadow: var(--box-shadow);
}

.card h2, .card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--color-text-primary);
}

.card p {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.6;
  margin-bottom: 0.75rem;
}

.card ul {
  list-style-type: none;
  padding-left: 0;
}

.card li {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  padding: 0.375rem 0;
  display: flex;
  flex-direction: column;
}

.card li strong {
  color: var(--color-text-primary);
  font-weight: 600;
}

/* 法律文档 / 政策排版 Policy Styles */
.policy-container {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 2.5rem 2rem;
  box-shadow: var(--box-shadow-card);
}

.policy-header {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
}

.policy-header h1 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-text-primary);
  margin-bottom: 0.5rem;
}

.policy-meta {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.lang-switch {
  display: inline-flex;
  gap: 0.75rem;
  background: var(--color-surface-subtle);
  padding: 0.375rem 0.75rem;
  border-radius: 6px;
  font-size: 0.875rem;
  margin-top: 1rem;
}

.lang-switch a {
  color: var(--color-text-secondary);
  font-weight: 500;
}

.lang-switch a.active {
  color: var(--color-accent);
  font-weight: 700;
}

.policy-section {
  margin-bottom: 2.5rem;
}

.policy-section h2 {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-text-primary);
  border-left: 4px solid var(--color-accent);
  padding-left: 0.75rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
}

.policy-section h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-top: 1.25rem;
  margin-bottom: 0.5rem;
}

.policy-section p {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 1rem;
}

.policy-section ul, .policy-section ol {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

.policy-section li {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.65;
  margin-bottom: 0.5rem;
}

.policy-table-wrapper {
  overflow-x: auto;
  margin: 1.25rem 0;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
}

.policy-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  text-align: left;
}

.policy-table th, .policy-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

.policy-table th {
  background-color: var(--color-surface-subtle);
  color: var(--color-text-primary);
  font-weight: 600;
}

.policy-table tr:last-child td {
  border-bottom: none;
}

.policy-table tr:hover td {
  background-color: #fafafa;
}

.callout {
  background-color: var(--color-accent-light);
  border-left: 4px solid var(--color-accent);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  margin: 1.25rem 0;
}

.callout p {
  margin-bottom: 0;
  color: #1e40af;
  font-size: 0.9375rem;
}

/* 页脚 Footer */
.site-footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  margin-top: auto;
  padding: 2.5rem 1.5rem;
}

.footer-content {
  max-width: var(--container-max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.footer-info {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.footer-company {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-text-primary);
}

.footer-company-en {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.footer-meta {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.footer-links a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* 响应式调整 Responsive */
@media (max-width: 640px) {
  .site-nav {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero {
    padding: 2rem 1.25rem;
  }

  .hero h1 {
    font-size: 1.5rem;
  }

  .policy-container {
    padding: 1.5rem 1rem;
  }

  .footer-top {
    flex-direction: column;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}