/**
 * global-brand.css — 全站品牌视觉规范
 * 统一颜色、字体、间距、排版层级
 * 所有页面引入此文件以保证视觉一致性
 * 2026-06 创建
 */

/* ===== 1. 品牌色彩体系 ===== */
:root {
  /* 主色 — 翠绿 */
  --brand-primary:       #10B981;
  --brand-primary-dark:  #059669;
  --brand-primary-darker:#047857;
  --brand-primary-light: #d1fae5;
  --brand-primary-bg:    rgba(16,185,129,.06);

  /* 文字色阶 */
  --brand-text:          #0f172a;
  --brand-text-secondary:#4b5563;
  --brand-text-muted:    #6b7280;
  --brand-text-light:    #9ca3af;

  /* 背景色阶 */
  --brand-bg:            #f8fafc;
  --brand-bg-white:      #ffffff;
  --brand-bg-gray:       #f1f5f9;

  /* 边框与阴影 */
  --brand-border:        #e5e7eb;
  --brand-border-light:  #f3f4f6;
  --brand-shadow-sm:     0 1px 3px rgba(0,0,0,.05);
  --brand-shadow-md:     0 4px 16px rgba(0,0,0,.06);
  --brand-shadow-lg:     0 8px 30px rgba(0,0,0,.08);

  /* 圆角 */
  --brand-radius-sm:     8px;
  --brand-radius-md:     12px;
  --brand-radius-lg:     16px;
  --brand-radius-xl:     20px;
}

/* ===== 2. 统一字体栈 ===== */
body {
  font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  color: var(--brand-text);
  line-height: 1.6;
}

/* ===== 3. 标题层级规范 =====
   h1: 页面主标题 (hero/banner)
   h2: 板块标题
   h3: 卡片/子板块标题
   h4: 列表项标题
   h5-h6: 辅助标签
   ===== */

/* 全局标题规范（低优先级，Tailwind 类和内联样式可覆盖） */
h1, h2, h3, h4, h5, h6 {
  color: var(--brand-text);
  font-weight: 700;
  letter-spacing: -0.01em;
}

h1 { font-size: 2rem;      line-height: 1.25; margin-bottom: 12px; }
h2 { font-size: 1.5rem;    line-height: 1.3;  margin-bottom: 10px; }
h3 { font-size: 1.125rem;  line-height: 1.4;  margin-bottom: 8px;  font-weight: 600; }
h4 { font-size: 1rem;      line-height: 1.4;  margin-bottom: 6px;  font-weight: 600; }
h5 { font-size: 0.875rem;  line-height: 1.4;  margin-bottom: 4px;  font-weight: 600; }
h6 { font-size: 0.8125rem; line-height: 1.4;  font-weight: 600;    color: var(--brand-text-secondary); }

/* ===== 4. 间距刻度标准 =====
   使用 8px 倍数体系:
   4  = 0.25rem
   8  = 0.5rem
   12 = 0.75rem
   16 = 1rem
   20 = 1.25rem
   24 = 1.5rem
   32 = 2rem
   40 = 2.5rem
   48 = 3rem
   64 = 4rem
   ===== */

/* Section 间距标准 */
.brand-section {
  padding: 48px 0;
}
.brand-section-sm {
  padding: 32px 0;
}
.brand-section-lg {
  padding: 64px 0;
}

@media (max-width: 768px) {
  .brand-section    { padding: 32px 0; }
  .brand-section-sm { padding: 24px 0; }
  .brand-section-lg { padding: 48px 0; }
}

/* ===== 5. 卡片组件标准 ===== */
.brand-card {
  background: var(--brand-bg-white);
  border: 1px solid var(--brand-border);
  border-radius: var(--brand-radius-md);
  padding: 24px;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}
.brand-card:hover {
  box-shadow: var(--brand-shadow-md);
  transform: translateY(-2px);
}

/* ===== 6. 按钮标准 ===== */
.brand-btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--brand-primary);
  color: #fff;
  padding: 10px 24px;
  border-radius: var(--brand-radius-md);
  font-weight: 500;
  font-size: 0.9375rem;
  transition: background 0.2s ease, box-shadow 0.2s ease;
  text-decoration: none;
  border: none;
  cursor: pointer;
}
.brand-btn-primary:hover {
  background: var(--brand-primary-dark);
  box-shadow: var(--brand-shadow-sm);
}

.brand-btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--brand-primary);
  padding: 10px 24px;
  border-radius: var(--brand-radius-md);
  border: 2px solid var(--brand-primary);
  font-weight: 500;
  font-size: 0.9375rem;
  transition: all 0.2s ease;
  text-decoration: none;
  cursor: pointer;
}
.brand-btn-outline:hover {
  background: var(--brand-primary-bg);
}

/* ===== 7. 移动端响应式基础 ===== */
@media (max-width: 768px) {
  body { font-size: 0.875rem; }

  h1 { font-size: 1.5rem;    }
  h2 { font-size: 1.25rem;   }
  h3 { font-size: 1rem;      }
  h4 { font-size: 0.9375rem; }
}

@media (max-width: 480px) {
  h1 { font-size: 1.375rem; }
  h2 { font-size: 1.125rem; }
}

/* ===== 8. 链接与交互 ===== */
a {
  color: var(--brand-primary);
  text-decoration: none;
  transition: color 0.15s ease;
}
a:hover {
  color: var(--brand-primary-dark);
}

/* 导航和页面内容区域保持默认继承色 */
nav a, header a, footer a, .nav-link, [class*="dropdown"] a {
  color: inherit;
}

/* ===== 9. 灰色映射标准 =====
   将常见硬编码灰色映射到品牌体系：
   #333 / #1D2129 → var(--brand-text)       深色正文
   #666 / #4b5563 → var(--brand-text-secondary) 次级文本
   #999 / #6b7280 → var(--brand-text-muted)  弱化文本
   #ccc / #9ca3af → var(--brand-text-light)  禁用/辅助
   #f5f5f5/#fafafa → var(--brand-bg)         浅灰背景
   #eee / #e5e7eb → var(--brand-border)      边框
   ===== */

/* ===== 10. 渐变标准 ===== */
.brand-gradient-hero {
  background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-primary-dark) 100%);
}
.brand-gradient-subtle {
  background: linear-gradient(135deg, #ecfdf5 0%, #d1fae5 100%);
}
.brand-gradient-text {
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-primary-dark));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== 11. 下拉菜单统一规范 ===== */
.dropdown-content {
  min-width: 220px;
  background: var(--brand-bg-white);
  border: 1px solid var(--brand-border-light);
  border-radius: var(--brand-radius-md);
  box-shadow: var(--brand-shadow-lg);
  padding: 8px 0;
}
.dropdown-content a {
  display: block;
  padding: 8px 16px;
  font-size: 0.875rem;
  color: var(--brand-text-secondary);
  transition: all 0.15s ease;
}
.dropdown-content a:hover {
  background: #ecfdf5;
  color: var(--brand-primary);
}
.dropdown-header {
  padding: 10px 16px 6px;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--brand-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ===== 12. 容器标准 ===== */
.brand-container {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== 13. 表格标准 ===== */
table {
  border-collapse: collapse;
  width: 100%;
}
th {
  background: var(--brand-bg-gray);
  font-weight: 600;
  text-align: left;
  padding: 12px 16px;
  border-bottom: 2px solid var(--brand-border);
  color: var(--brand-text);
  font-size: 0.875rem;
}
td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--brand-border-light);
  font-size: 0.875rem;
  color: var(--brand-text-secondary);
}
tr:hover td {
  background: var(--brand-primary-bg);
}

/* ===== 14. 选择优化 ===== */
::selection {
  background: var(--brand-primary-light);
  color: var(--brand-text);
}

/* ===== 15. 滚动条美化 ===== */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: var(--brand-bg);
}
::-webkit-scrollbar-thumb {
  background: var(--brand-border);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--brand-text-light);
}

/* ===== 16. 图片标准 ===== */
img {
  max-width: 100%;
  height: auto;
}

/* ===== 17. 过渡动画标准 ===== */
.brand-transition {
  transition: all 0.2s ease;
}
.brand-transition-slow {
  transition: all 0.3s ease;
}