:root {
  --bg: #ffffff;
  --bg-elevated: #f7f7f8;
  --text: #1a1a1a;
  --text-muted: #62636a;
  --border: #e4e4e7;
  --accent: #e85c0d;
  --accent-fg: #ffffff;
  --code-bg: #f4f4f5;
  --code-fg: #c2410c;
  --link: #c44a00;
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.08);

  --note-bg: #eff6ff;
  --note-border: #3b82f6;
  --warning-bg: #fffbeb;
  --warning-border: #f59e0b;
  --tip-bg: #f0fdf4;
  --tip-border: #22c55e;
  --info-bg: #eff6ff;
  --info-border: #3b82f6;
  --check-bg: #f0fdf4;
  --check-border: #22c55e;
  --danger-bg: #fef2f2;
  --danger-border: #ef4444;
}

:root[data-theme='dark'] {
  --bg: #16171a;
  --bg-elevated: #1d1e22;
  --text: #eceef0;
  --text-muted: #9a9ba3;
  --border: #2b2c31;
  --accent: #ff7a30;
  --accent-fg: #16171a;
  --code-bg: #232427;
  --code-fg: #ff9a5a;
  --link: #ff9a5a;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.4);

  --note-bg: #142238;
  --note-border: #3b82f6;
  --warning-bg: #302407;
  --warning-border: #f59e0b;
  --tip-bg: #0f2417;
  --tip-border: #22c55e;
  --info-bg: #142238;
  --info-border: #3b82f6;
  --check-bg: #0f2417;
  --check-border: #22c55e;
  --danger-bg: #2c1414;
  --danger-border: #ef4444;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial,
    sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--link);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  height: 56px;
  padding: 0 1rem;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.icon-btn {
  background: none;
  border: none;
  font-size: 1.1rem;
  cursor: pointer;
  color: var(--text);
  padding: 0.35rem 0.5rem;
  border-radius: 6px;
  line-height: 1;
}
.icon-btn:hover {
  background: var(--bg-elevated);
}

#menu-btn {
  display: none;
}

.site-title {
  font-weight: 700;
  font-size: 0.95rem;
  white-space: nowrap;
}
.site-title .accent {
  color: var(--accent);
}

.search-wrap {
  flex: 1;
  max-width: 320px;
  margin-left: 1rem;
}

#search-input {
  width: 100%;
  padding: 0.4rem 0.7rem;
  border-radius: 7px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text);
  font-size: 0.85rem;
}
#search-input:focus {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
}

.header-spacer {
  flex: 1;
}

.copy-md-btn {
  position: fixed;
  top: 4.3rem;
  right: 1.75rem;
  z-index: 15;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: 999px;
  padding: 0.42rem 0.9rem 0.42rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease,
    box-shadow 0.15s ease, transform 0.08s ease;
}
.copy-md-btn:hover {
  background: var(--bg);
  color: var(--text);
  border-color: var(--accent);
  box-shadow: var(--shadow);
}
.copy-md-btn:active {
  transform: scale(0.96);
}
.copy-md-btn.is-copied {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--bg);
}
.copy-md-icon {
  display: flex;
  flex-shrink: 0;
  line-height: 1;
}
.copy-md-icon svg {
  display: block;
}

.site-body {
  display: flex;
  min-height: calc(100% - 56px);
}

.site-sidebar {
  width: 260px;
  flex-shrink: 0;
  border-right: 1px solid var(--border);
  padding: 1.25rem 0.75rem 2rem;
  overflow-y: auto;
  position: sticky;
  top: 56px;
  height: calc(100vh - 56px);
}

.nav-group {
  margin-bottom: 1.35rem;
}

.nav-group-title {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  margin: 0 0 0.4rem 0.6rem;
}

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

.nav-group a {
  display: block;
  padding: 0.4rem 0.6rem;
  border-radius: 6px;
  color: var(--text);
  font-size: 0.88rem;
}

.nav-group a:hover {
  background: var(--bg-elevated);
  text-decoration: none;
}

.nav-group a.active {
  background: var(--accent);
  color: var(--accent-fg);
  font-weight: 600;
}

.sidebar-backdrop {
  display: none;
}

.site-main {
  flex: 1;
  min-width: 0;
  overflow-y: auto;
  height: calc(100vh - 56px);
  display: flex;
  justify-content: center;
}

.content-shell {
  position: relative;
  width: 100%;
  max-width: 760px;
}

#content {
  width: 100%;
  padding: 2.5rem 1.5rem 11rem;
  line-height: 1.65;
}

#content h1 {
  font-size: 1.9rem;
  margin: 0 0 0.5rem;
}
#content h2 {
  font-size: 1.4rem;
  margin: 2rem 0 0.75rem;
  padding-top: 0.25rem;
  border-top: 1px solid var(--border);
}
#content h1 + h2,
#content .page-desc + h2 {
  border-top: none;
  padding-top: 0;
}
#content h3 {
  font-size: 1.1rem;
  margin: 1.5rem 0 0.5rem;
}
#content p {
  margin: 0.85rem 0;
}
#content .page-desc {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-top: 0;
}
#content ul,
#content ol {
  padding-left: 1.4rem;
  margin: 0.85rem 0;
}
#content li {
  margin: 0.3rem 0;
}
#content blockquote {
  margin: 1rem 0;
  padding: 0.4rem 1rem;
  border-left: 3px solid var(--border);
  color: var(--text-muted);
}
#content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}
#content img {
  max-width: 100%;
  border-radius: 8px;
}

#content code {
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.85em;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.code-block {
  margin: 1rem 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.4rem 0.8rem;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.copy-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: 5px;
  padding: 0.15rem 0.55rem;
  font-size: 0.72rem;
  cursor: pointer;
  text-transform: none;
  letter-spacing: normal;
}
.copy-btn:hover {
  background: var(--bg);
  color: var(--text);
}
.code-block pre {
  margin: 0;
  padding: 0.9rem 1rem;
  overflow-x: auto;
}
.code-block code {
  background: none;
  padding: 0;
  color: var(--text);
  font-size: 0.85rem;
}

.table-wrap {
  overflow-x: auto;
  margin: 1rem 0;
}
table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.88rem;
}
th,
td {
  border: 1px solid var(--border);
  padding: 0.5rem 0.7rem;
  text-align: left;
  vertical-align: top;
}
th {
  background: var(--bg-elevated);
  font-weight: 600;
}

.callout {
  margin: 1.1rem 0;
  padding: 0.85rem 1rem;
  border-radius: 8px;
  border-left: 4px solid var(--border);
}
.callout-title {
  margin: 0 0 0.3rem;
  font-weight: 700;
  font-size: 0.85rem;
}
.callout-body p:first-child {
  margin-top: 0;
}
.callout-body p:last-child {
  margin-bottom: 0;
}
.callout-note {
  background: var(--note-bg);
  border-color: var(--note-border);
}
.callout-info {
  background: var(--info-bg);
  border-color: var(--info-border);
}
.callout-warning {
  background: var(--warning-bg);
  border-color: var(--warning-border);
}
.callout-tip {
  background: var(--tip-bg);
  border-color: var(--tip-border);
}
.callout-check {
  background: var(--check-bg);
  border-color: var(--check-border);
}
.callout-danger {
  background: var(--danger-bg);
  border-color: var(--danger-border);
}

.empty-state,
.loading {
  color: var(--text-muted);
  padding: 2rem 0;
}
.empty-state pre {
  background: var(--code-bg);
  padding: 0.75rem 1rem;
  border-radius: 8px;
  overflow-x: auto;
}

@media (max-width: 768px) {
  #menu-btn {
    display: inline-flex;
  }
  .search-wrap {
    max-width: none;
  }
  .copy-md-label {
    display: none;
  }
  .copy-md-btn {
    top: 4rem;
    right: 1rem;
    padding: 0.5rem;
  }
  .site-sidebar {
    position: fixed;
    top: 56px;
    left: 0;
    height: calc(100vh - 56px);
    width: 82vw;
    max-width: 300px;
    background: var(--bg);
    z-index: 30;
    transform: translateX(-100%);
    transition: transform 0.2s ease;
  }
  body.sidebar-open .site-sidebar {
    transform: translateX(0);
    box-shadow: var(--shadow);
  }
  body.sidebar-open .sidebar-backdrop {
    display: block;
    position: fixed;
    inset: 56px 0 0 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 25;
  }
  #content {
    padding: 1.5rem 1.1rem 8rem;
  }
}