/* 变量（浅色主题） */
:root {
  color-scheme: light;
  --sidebar-width: 260px;
  --color-bg: #f8fafc;
  --color-sidebar: #ffffff;
  --color-border: #e2e8f0;
  --color-text: #0f172a;
  --color-text-muted: #64748b;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-code-bg: #f1f5f9;
  --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}

.layout {
  display: flex;
  min-height: 100vh;
}

/* 侧边栏 */
.sidebar {
  width: var(--sidebar-width);
  background: var(--color-sidebar);
  border-right: 1px solid var(--color-border);
  flex-shrink: 0;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.sidebar-header {
  padding: 24px 20px;
  border-bottom: 1px solid var(--color-border);
}

.logo {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
}

.logo-desc {
  margin: 4px 0 0;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.sidebar-contact {
  margin: 14px 0 0;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.sidebar-contact-id {
  font-family: var(--font-mono);
  color: var(--color-text);
}

.nav {
  padding: 16px 0;
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-item {
  margin: 0;
}

.nav-link {
  display: block;
  padding: 12px 20px;
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  transition: all 0.15s ease;
  border-left: 3px solid transparent;
}

.nav-link:hover {
  color: var(--color-text);
  background: rgba(59, 130, 246, 0.08);
}

.nav-link.active {
  color: var(--color-accent);
  background: rgba(59, 130, 246, 0.12);
  border-left-color: var(--color-accent);
}

.nav-group {
  margin: 0;
}

.nav-group-toggle {
  display: flex;
  align-items: center;
  width: 100%;
  padding: 12px 20px;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.15s ease;
  text-align: left;
}

.nav-group-toggle:hover {
  color: var(--color-text);
  background: rgba(59, 130, 246, 0.08);
}

.nav-group-arrow {
  display: inline-block;
  width: 0;
  height: 0;
  margin-right: 10px;
  border-left: 5px solid currentColor;
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  transition: transform 0.2s ease;
}

.nav-group-toggle.expanded .nav-group-arrow {
  transform: rotate(90deg);
}

.nav-group-title {
  flex: 1;
}

.nav-sublist {
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-sublink {
  padding-left: 47px;
}

.nav-subsection {
  margin: 0;
  list-style: none;
}

.nav-subsection-title {
  padding: 10px 20px 4px 47px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--color-text-muted);
}

.nav-subsection-list {
  list-style: none;
  margin: 0 0 6px;
  padding: 0;
}

.nav-subsection-list .nav-sublink {
  padding-left: 52px;
}

/* 主内容区 */
.content {
  flex: 1;
  padding: 40px 48px 60px;
  max-width: 900px;
}

.file-detail {
  min-height: 100%;
}

.welcome {
  padding-top: 20px;
}

.welcome h2 {
  margin: 0 0 16px;
  font-size: 1.75rem;
  font-weight: 600;
}

.welcome > p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 1rem;
}

.welcome-catalog {
  margin-top: 32px;
}

.welcome-catalog-section {
  margin-bottom: 24px;
}

.welcome-catalog-title {
  margin: 0 0 12px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--color-text-muted);
}

.welcome-catalog-subtitle {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.welcome-catalog-subtitle--break {
  grid-column: 1 / -1;
  margin-top: 4px;
}

.welcome-catalog-subtitle--break:first-child {
  margin-top: 0;
}

.welcome-catalog-links {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 8px;
}

.welcome-catalog-link {
  display: block;
  padding: 8px 14px;
  font-size: 0.9rem;
  color: var(--color-text);
  text-decoration: none;
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  text-align: center;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.welcome-catalog-link:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: rgba(59, 130, 246, 0.08);
}

.hidden {
  display: none !important;
}

.file-content h2 {
  margin: 0 0 8px;
  font-size: 1.5rem;
  font-weight: 600;
}

.file-desc {
  margin: 0 0 24px;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.section {
  margin-bottom: 32px;
}

.section-title {
  margin: 0 0 12px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
}

.section-note {
  margin: 0 0 12px;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* 数据范围元信息 */
.meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}

.meta-item {
  padding: 14px 16px;
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: 8px;
}

.meta-label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.meta-value {
  display: block;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
  word-break: break-all;
}

/* 代码块 */
.code-block {
  position: relative;
  background: var(--color-code-bg);
  border-radius: 8px;
  overflow: hidden;
  margin: 0;
}

.code-copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  padding: 6px 12px;
  font-size: 0.8rem;
  font-family: inherit;
  color: var(--color-text-muted);
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  cursor: pointer;
  transition: color 0.15s, background 0.15s, border-color 0.15s;
  z-index: 1;
}

.code-copy-btn:hover {
  color: var(--color-text);
  background: rgba(59, 130, 246, 0.2);
  border-color: var(--color-accent);
}

.code-copy-btn.copied {
  color: #15803d;
  border-color: #15803d;
}

.code-block pre {
  margin: 0;
  padding: 20px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--color-text);
}

/* 样例文件预览 */
.sample-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 12px;
  padding: 12px 16px;
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
}

.sample-filename {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-text);
  word-break: break-all;
}

.sample-actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.sample-action-btn {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  font-size: 0.85rem;
  font-family: inherit;
  color: var(--color-accent);
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  text-decoration: none;
  cursor: pointer;
  transition: color 0.15s, background 0.15s, border-color 0.15s;
}

.sample-action-btn:hover {
  color: var(--color-accent-hover);
  background: rgba(37, 99, 235, 0.08);
  border-color: var(--color-accent);
}

.sample-preview {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
  background: #fff;
}

.sample-preview-scroll {
  overflow-x: auto;
}

.sample-preview-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
  font-family: var(--font-mono);
}

.sample-preview-table th,
.sample-preview-table td {
  padding: 8px 12px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

.sample-preview-table th {
  background: var(--color-code-bg);
  color: var(--color-text-muted);
  font-weight: 500;
  position: sticky;
  top: 0;
}

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

.sample-preview-loading,
.sample-preview-empty,
.sample-preview-error {
  margin: 0;
  padding: 24px 16px;
  text-align: center;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.sample-preview-error {
  color: #b91c1c;
}

.sample-preview-hint {
  margin: 0;
  padding: 10px 16px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  background: var(--color-code-bg);
  border-top: 1px solid var(--color-border);
}

/* 字段表 */
.params-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.params-table th,
.params-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.params-table th {
  color: var(--color-text-muted);
  font-weight: 500;
}

.params-table td {
  color: var(--color-text);
}

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

.params-table code {
  background: var(--color-code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.85em;
}

/* 图片介绍 */
.file-image-wrap {
  margin: 0 0 16px;
  padding: 0;
}

.file-image {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  border: 1px solid var(--color-border);
}

.file-image-caption {
  margin-top: 8px;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.image-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 180px;
  border: 1px dashed var(--color-border);
  border-radius: 8px;
  background: var(--color-code-bg);
}

.image-placeholder-text {
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

/* 响应式 */
@media (max-width: 768px) {
  .layout {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    height: auto;
    position: relative;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }

  .content {
    padding: 24px 20px 40px;
  }

  .nav-sublink {
    padding-left: 32px;
  }

  .nav-subsection-title {
    padding-left: 32px;
  }

  .nav-subsection-list .nav-sublink {
    padding-left: 40px;
  }
}