/* ================================
   K8设计系统 - 基础样式
   ================================ */

/* ================================
   Typography - 字体系统
   ================================ */

/* 标题样式 - 桌面端 */
.k8-h1, h1 {
  font-size: 48px;
  line-height: 1.1;
  font-weight: 600;
  color: var(--k8-text-primary);
  margin-bottom: var(--k8-space-4);
}

.k8-h2, h2 {
  font-size: 36px;
  line-height: 1.2;
  font-weight: 600;
  color: var(--k8-text-primary);
  margin-bottom: var(--k8-space-4);
}

.k8-h3, h3 {
  font-size: 28px;
  line-height: 1.3;
  font-weight: 600;
  color: var(--k8-text-primary);
  margin-bottom: var(--k8-space-3);
}

.k8-h4, h4 {
  font-size: 24px;
  line-height: 1.4;
  font-weight: 500;
  color: var(--k8-text-primary);
  margin-bottom: var(--k8-space-3);
}

.k8-h5, h5 {
  font-size: 20px;
  line-height: 1.4;
  font-weight: 500;
  color: var(--k8-text-primary);
  margin-bottom: var(--k8-space-3);
}

.k8-h6, h6 {
  font-size: 18px;
  line-height: 1.4;
  font-weight: 500;
  color: var(--k8-text-primary);
  margin-bottom: var(--k8-space-3);
}

/* 段落和文本 */
p {
  margin-bottom: var(--k8-space-3);
  color: var(--k8-text-primary);
}

/* 链接样式 */
a {
  color: var(--k8-primary);
  text-decoration: none;
  transition: color var(--k8-transition-fast);
}

a:hover,
a:focus {
  color: var(--k8-primary-gradient);
  text-decoration: none;
}

/* 列表样式 */
.k8-list {
  margin-bottom: var(--k8-space-3);
}

.k8-list-item {
  margin-bottom: var(--k8-space-2);
}

.k8-list-ordered {
  list-style: decimal;
  padding-left: var(--k8-space-4);
}

.k8-list-unordered {
  list-style: disc;
  padding-left: var(--k8-space-4);
}

/* 代码样式 */
code {
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 0.9em;
  background-color: var(--k8-lighter);
  padding: 2px 4px;
}

pre {
  background-color: var(--k8-lighter);
  padding: var(--k8-space-3);
  overflow-x: auto;
  margin-bottom: var(--k8-space-3);
}

pre code {
  background: none;
  padding: 0;
}

/* 引用样式 */
blockquote {
  border-left: 4px solid var(--k8-primary);
  padding-left: var(--k8-space-3);
  margin: var(--k8-space-3) 0;
  font-style: italic;
  color: var(--k8-text-secondary);
}

/* ================================
   Container System - 容器系统
   ================================ */

.k8-container {
  width: 100%;
  margin: 0 auto;
  padding: 0 var(--k8-space-3);
}

.k8-container-fluid {
  width: 100%;
  padding: 0 var(--k8-space-3);
}

/* ================================
   Layout System - 布局系统
   ================================ */

/* 主要布局区域 */
.k8-layout {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.k8-header {
  background-color: var(--k8-bg-light);
  border-bottom: 1px solid var(--k8-border-light);
  position: sticky;
  top: 0;
  z-index: var(--k8-z-sticky);
}

.k8-main {
  flex: 1;
  padding: var(--k8-space-4) 0;
}

.k8-sidebar {
  background-color: var(--k8-light);
  border-right: 1px solid var(--k8-border-light);
  min-height: 100vh;
}

/* Section spacing */
.k8-section {
  padding: var(--k8-space-7) 0;
}

.k8-section-sm {
  padding: var(--k8-space-5) 0;
}

.k8-section-lg {
  padding: var(--k8-space-8) 0;
}

/* ================================
   Responsive Design - 响应式设计
   ================================ */

/* 移动端 (320px - 767px) */
@media (max-width: 767px) {
  .k8-container {
    padding: 0 var(--k8-space-3);
    max-width: 100%;
  }
  
  .k8-h1, h1 { font-size: 28px; }
  .k8-h2, h2 { font-size: 24px; }
  .k8-h3, h3 { font-size: 20px; }
  .k8-h4, h4 { font-size: 18px; }
  .k8-h5, h5 { font-size: 16px; }
  .k8-h6, h6 { font-size: 14px; }
  
  .k8-section {
    padding: var(--k8-space-4) 0;
  }
  
  .k8-section-sm {
    padding: var(--k8-space-3) 0;
  }
  
  .k8-section-lg {
    padding: var(--k8-space-6) 0;
  }
}

/* 平板端 (768px - 1023px) */
@media (min-width: 768px) and (max-width: 1023px) {
  .k8-container {
    max-width: var(--k8-container-tablet);
    padding: 0 var(--k8-space-4);
  }
  
  .k8-h1, h1 { font-size: 36px; }
  .k8-h2, h2 { font-size: 28px; }
  .k8-h3, h3 { font-size: 24px; }
  .k8-h4, h4 { font-size: 20px; }
  .k8-h5, h5 { font-size: 18px; }
  .k8-h6, h6 { font-size: 16px; }
  
  .k8-section {
    padding: var(--k8-space-6) 0;
  }
}

/* 桌面端 (1024px+) */
@media (min-width: 1024px) {
  .k8-container {
    max-width: var(--k8-container-desktop);
    padding: 0 var(--k8-space-5);
  }
}

/* 宽屏桌面 (1200px+) */
@media (min-width: 1200px) {
  .k8-container {
    max-width: var(--k8-container-wide);
  }
}

/* ================================
   Common Elements - 通用元素
   ================================ */

/* 分割线 */
.k8-divider {
  border: none;
  height: 1px;
  background-color: var(--k8-border);
  margin: var(--k8-space-4) 0;
}

.k8-divider-vertical {
  width: 1px;
  height: 100%;
  background-color: var(--k8-border);
  margin: 0 var(--k8-space-4);
}

/* 图片样式 */
.k8-img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* 表格样式 */
.k8-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--k8-space-3);
}

.k8-table th,
.k8-table td {
  padding: var(--k8-space-2) var(--k8-space-3);
  text-align: left;
  border-bottom: 1px solid var(--k8-border-light);
}

.k8-table th {
  font-weight: 600;
  background-color: var(--k8-light);
  color: var(--k8-text-primary);
}

.k8-table-striped tbody tr:nth-child(odd) {
  background-color: var(--k8-light);
}

.k8-table-hover tbody tr:hover {
  background-color: var(--k8-lighter);
}

/* 焦点状态 - 智能focus管理 */
*:focus {
  outline: none;
}

.k8-focus:focus-visible,
*:focus-visible {
  outline: 2px solid var(--k8-primary);
  outline-offset: 2px;
}

@supports not selector(:focus-visible) {
  /* 按钮和表单元素在focus时显示outline */
  button:focus,
  input:focus,
  textarea:focus,
  select:focus {
    outline: 2px solid var(--k8-primary);
    outline-offset: 2px;
  }

  a:focus:not(:hover) {
    outline: 2px solid var(--k8-primary);
    outline-offset: 2px;
  }
}