/**
 * QuantaPay 文档系统样式
 * 设计理念：简洁、清晰、功能导向
 */

:root {
  /* 主题色彩 - 复用网站配色 */
  --doc-primary: #0ea5e9;
  --doc-primary-light: #38bdf8;
  --doc-primary-dark: #0284c7;

  /* 文档专属配色 */
  --doc-bg: #ffffff;
  --doc-bg-secondary: #f8fafc;
  --doc-border: #e2e8f0;
  --doc-text: #0f172a;
  --doc-text-muted: #64748b;

  /* 类型徽章颜色 */
  --doc-guide: #10b981;
  --doc-api: #3b82f6;
  --doc-tutorial: #f59e0b;
  --doc-faq: #8b5cf6;
}

/* === 基础样式重置 === */
body {
  margin: 0;
  padding: 0;
  padding-top: 80px; /* 给固定头部留出空间 */
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--doc-text);
  background: var(--doc-bg-secondary);
  line-height: 1.6;
}

* {
  box-sizing: border-box;
}

a {
  text-decoration: none;
  color: inherit;
}

/* === 基础布局 === */
.docs-layout {
  min-height: calc(100vh - 80px);
  background: var(--doc-bg-secondary);
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* === Hero 区域 === */
.docs-hero {
  background: linear-gradient(135deg, #0ea5e9 0%, #0284c7 100%);
  padding: 4rem 0 3rem;
  color: white;
  text-align: center;
}

.hero-content {
  max-width: 700px;
  margin: 0 auto;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin: 0 0 1rem 0;
}

.hero-subtitle {
  font-size: 1.125rem;
  opacity: 0.95;
  margin-bottom: 2rem;
}

.search-box {
  max-width: 500px;
  margin: 0 auto;
  position: relative;
}

.search-box i {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: #94a3b8;
}

.search-box input {
  width: 100%;
  padding: 0.875rem 1rem 0.875rem 3rem;
  border: 2px solid rgba(255,255,255,0.2);
  border-radius: 0.5rem;
  font-size: 1rem;
  background: rgba(255,255,255,0.1);
  color: white;
  backdrop-filter: blur(10px);
}

.search-box input::placeholder {
  color: rgba(255,255,255,0.7);
}

.search-box input:focus {
  outline: none;
  border-color: rgba(255,255,255,0.4);
  background: rgba(255,255,255,0.15);
}

/* === 分类卡片 === */
.docs-categories {
  padding: 3rem 0;
  background: white;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-top: 1rem;
}

.category-card {
  background: white;
  border: 2px solid var(--doc-border);
  border-radius: 0.75rem;
  padding: 2rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
}

.category-card:hover {
  border-color: var(--doc-primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(14,165,233,0.15);
}

.category-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  color: var(--doc-primary);
}

.category-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 0.5rem 0;
  color: var(--doc-text);
}

.category-card p {
  font-size: 0.875rem;
  color: var(--doc-text-muted);
  margin: 0 0 1rem 0;
}

.category-badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--doc-bg-secondary);
  border-radius: 1rem;
  font-size: 0.875rem;
  color: var(--doc-text-muted);
}

/* === 内容区域 === */
.docs-content {
  padding: 3rem 0;
}

.content-wrapper {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 3rem;
  align-items: start;
}

/* === 侧边栏 === */
.docs-sidebar {
  position: sticky;
  top: 100px;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
}

.sidebar-card {
  background: white;
  border: 1px solid var(--doc-border);
  border-radius: 0.75rem;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.sidebar-title {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--doc-text-muted);
  margin: 0 0 1rem 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.sidebar-title i {
  font-size: 1rem;
}

/* === 树形导航 === */
.docs-tree-nav {
  font-size: 0.9375rem;
}

.tree-node {
  margin-bottom: 0.25rem;
}

.tree-node a {
  display: block;
  padding: 0.5rem 0.75rem;
  color: var(--doc-text);
  text-decoration: none;
  border-radius: 0.375rem;
  transition: all 0.15s;
}

.tree-node a:hover {
  background: var(--doc-bg-secondary);
  color: var(--doc-primary);
}

.tree-node.active > a {
  background: #e0f2fe;
  color: var(--doc-primary);
  font-weight: 500;
}

.tree-node .toggle {
  cursor: pointer;
  padding: 0.25rem;
  color: var(--doc-text-muted);
  margin-right: 0.25rem;
}

.tree-children {
  padding-left: 1.25rem;
  margin-top: 0.25rem;
  border-left: 1px solid var(--doc-border);
}

/* === 主要内容 === */
.docs-main {
  min-width: 0;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--doc-text);
  margin: 0 0 1.5rem 0;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.section-title i {
  color: var(--doc-primary);
}

/* === 特色文档 === */
.featured-docs {
  margin-bottom: 3rem;
}

.featured-docs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.featured-doc-card {
  background: white;
  border: 1px solid var(--doc-border);
  border-radius: 0.75rem;
  padding: 1.5rem;
  transition: all 0.2s;
}

.featured-doc-card:hover {
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  transform: translateY(-2px);
}

/* === 所有文档 === */
.all-docs {
  margin-top: 3rem;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.filter-bar {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 0.5rem 1rem;
  border: 1px solid var(--doc-border);
  background: white;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.15s;
}

.filter-btn:hover {
  border-color: var(--doc-primary);
  color: var(--doc-primary);
}

.filter-btn.active {
  background: var(--doc-primary);
  color: white;
  border-color: var(--doc-primary);
}

/* === 文档卡片 === */
.docs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.doc-card {
  background: white;
  border: 1px solid var(--doc-border);
  border-radius: 0.75rem;
  padding: 1.5rem;
  transition: all 0.2s;
  position: relative;
}

.doc-card:hover {
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  transform: translateY(-2px);
}

.doc-type-badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 1rem;
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.doc-card[data-type="guide"] .doc-type-badge {
  background: #dcfce7;
  color: #166534;
}

.doc-card[data-type="api"] .doc-type-badge {
  background: #dbeafe;
  color: #1e40af;
}

.doc-card[data-type="tutorial"] .doc-type-badge {
  background: #fef3c7;
  color: #92400e;
}

.doc-card[data-type="faq"] .doc-type-badge {
  background: #f3e8ff;
  color: #6b21a8;
}

.doc-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0 0 0.75rem 0;
}

.doc-card h3 a {
  color: var(--doc-text);
  text-decoration: none;
}

.doc-card h3 a:hover {
  color: var(--doc-primary);
}

.doc-card p {
  font-size: 0.9375rem;
  color: var(--doc-text-muted);
  margin: 0 0 1rem 0;
  line-height: 1.6;
}

.doc-meta {
  font-size: 0.875rem;
  color: var(--doc-text-muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.doc-meta i {
  font-size: 0.875rem;
}

.read-more {
  color: var(--doc-primary);
  font-weight: 500;
  text-decoration: none;
  font-size: 0.9375rem;
}

.read-more:hover {
  text-decoration: underline;
}

/* === 响应式 === */
@media (max-width: 1024px) {
  .content-wrapper {
    grid-template-columns: 1fr;
  }

  .docs-sidebar {
    position: static;
    max-height: none;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2rem;
  }

  .category-grid {
    grid-template-columns: 1fr;
  }

  .docs-grid {
    grid-template-columns: 1fr;
  }

  .section-header {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* === 滚动条样式 === */
.docs-sidebar::-webkit-scrollbar {
  width: 6px;
}

.docs-sidebar::-webkit-scrollbar-track {
  background: transparent;
}

.docs-sidebar::-webkit-scrollbar-thumb {
  background: var(--doc-border);
  border-radius: 3px;
}

.docs-sidebar::-webkit-scrollbar-thumb:hover {
  background: var(--doc-text-muted);
}