/* === Reset === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* === Variables === */
:root {
  --font-body: "Inter", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Fira Code", "Fira Mono", Menlo, monospace;
  --color-bg: #fafafa;
  --color-text: #1a1a1a;
  --color-text-secondary: #666;
  --color-border: #e0e0e0;
  --color-accent: #1a1a1a;
  --color-code-bg: #f0f0f0;
  --color-link: #1a1a1a;
  --color-hover-bg: rgba(0,0,0,0.02);
  --max-width: 680px;
  --nav-height: 56px;
}

[data-theme="dark"] {
  --color-bg: #1a1a1a;
  --color-text: #e0e0e0;
  --color-text-secondary: #999;
  --color-border: #333;
  --color-accent: #e0e0e0;
  --color-code-bg: #252525;
  --color-link: #e0e0e0;
  --color-hover-bg: rgba(255,255,255,0.03);
}

/* === Base === */
html {
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* === Header === */
.site-header {
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  background: var(--color-bg);
  z-index: 100;
}

.site-header nav {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
  min-height: var(--nav-height);
  display: flex;
  align-items: center;
  gap: 24px;
}

.site-title {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  color: var(--color-text);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.nav-links a {
  font-size: 14px;
  text-decoration: none;
  color: var(--color-text-secondary);
  transition: color 0.15s;
}

.nav-links a:hover {
  color: var(--color-text);
}

.nav-controls {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 12px;
}

.search-trigger,
.search-close {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 4px 10px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-secondary);
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.search-trigger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.search-shortcut {
  color: var(--color-text-secondary);
  opacity: 0.8;
}

.search-trigger:hover,
.search-close:hover {
  color: var(--color-text);
  border-color: var(--color-text-secondary);
}

/* === Main === */
main {
  flex: 1;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

/* === Homepage === */
.home-hero {
  margin: 0 0 40px;
}

.home-hero img {
  display: block;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  border-radius: 10px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.12);
}

.homepage .content > h1:first-child,
.homepage .content > p:first-of-type {
  /* handled by general styles */
}

/* === Page === */
.page-header h1,
.section-page .page-header h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 8px;
}

/* === Content === */
.content h1 { font-size: 2rem; font-weight: 700; letter-spacing: -0.02em; line-height: 1.2; margin: 48px 0 16px; }
.content h2 { font-size: 1.35rem; font-weight: 700; letter-spacing: -0.01em; line-height: 1.3; margin: 40px 0 12px; }
.content h3 { font-size: 1.05rem; font-weight: 600; line-height: 1.4; margin: 32px 0 8px; }
.content h4 { font-size: 0.9rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; margin: 24px 0 8px; }

.content p { margin-bottom: 16px; }

.content a {
  color: var(--color-link);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
}

.content a:hover {
  text-decoration-thickness: 2px;
}

.content ul, .content ol {
  margin: 0 0 16px 20px;
}

.content li {
  margin-bottom: 6px;
}

.content li + li {
  margin-top: 4px;
}

.content hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 32px 0;
}

.content blockquote {
  border-left: 3px solid var(--color-border);
  padding-left: 16px;
  color: var(--color-text-secondary);
  margin: 16px 0;
}

.content strong {
  font-weight: 600;
}

.content em {
  font-style: italic;
}

/* === Code === */
.content code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--color-code-bg);
  padding: 2px 5px;
  border-radius: 3px;
}

.content pre {
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 16px 18px;
  overflow-x: auto;
  margin: 16px 0 24px;
  line-height: 1.5;
}

.content pre code {
  background: none;
  padding: 0;
  border-radius: 0;
  font-size: 0.85rem;
}

.content pre code.language-froth {
  display: block;
  color: var(--color-text);
}

.content pre code .tok-comment {
  color: #7c8a96;
}

.content pre code .tok-string {
  color: #0b7a75;
}

.content pre code .tok-number {
  color: #9a3412;
}

.content pre code .tok-builtin {
  color: #2251c3;
  font-weight: 600;
}

.content pre code .tok-keyword,
.content pre code .tok-tick {
  color: #b4237f;
  font-weight: 600;
}

.content pre code .tok-function {
  color: #5a3cc7;
  font-weight: 700;
}

.content pre code .tok-variable {
  color: #7a4f01;
}

.content pre code .tok-bracket {
  color: #4b5563;
}

[data-theme="dark"] .content pre code .tok-comment {
  color: #8996a3;
}

[data-theme="dark"] .content pre code .tok-string {
  color: #58d6cf;
}

[data-theme="dark"] .content pre code .tok-number {
  color: #ff9b67;
}

[data-theme="dark"] .content pre code .tok-builtin {
  color: #81a8ff;
}

[data-theme="dark"] .content pre code .tok-keyword,
[data-theme="dark"] .content pre code .tok-tick {
  color: #ff78c8;
}

[data-theme="dark"] .content pre code .tok-function {
  color: #c0a3ff;
}

[data-theme="dark"] .content pre code .tok-variable {
  color: #f7ba58;
}

[data-theme="dark"] .content pre code .tok-bracket {
  color: #a6b0b9;
}

/* === Page Nav === */
.page-nav-top, .page-nav-bottom {
  display: flex;
  justify-content: space-between;
  padding: 12px 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  margin: 24px 0;
  font-size: 14px;
}

.page-nav-top { margin-top: 0; }

.page-nav-top a, .page-nav-bottom a {
  text-decoration: none;
  color: var(--color-text-secondary);
}

.page-nav-top a:hover, .page-nav-bottom a:hover {
  color: var(--color-text);
}

.page-nav-top .next, .page-nav-bottom .next {
  margin-left: auto;
}

/* === Section Page List === */
.page-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  counter-reset: page-list;
}

.page-list li {
  counter-increment: page-list;
  margin: 0;
}

.page-list li a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
  text-decoration: none;
  color: var(--color-text);
  transition: background 0.1s;
}

.page-list li:first-child a {
  border-top: 1px solid var(--color-border);
}

.page-list li a:hover {
  background: var(--color-hover-bg);
}

.page-list li a::before {
  content: counter(page-list, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-text-secondary);
  flex-shrink: 0;
  width: 28px;
}

.page-list-title {
  font-weight: 500;
}

.page-list-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
}

/* === Footer === */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 24px;
  text-align: center;
  font-size: 13px;
  color: var(--color-text-secondary);
  font-family: var(--font-mono);
}

/* === Theme Toggle === */
.theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 4px 8px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-secondary);
  transition: color 0.15s, border-color 0.15s;
}

.theme-toggle:hover {
  color: var(--color-text);
  border-color: var(--color-text-secondary);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.search-shell {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 24px 20px;
  overflow-y: auto;
}

.search-shell[hidden] {
  display: none;
}

.search-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(6px);
}

.search-dialog {
  position: relative;
  width: min(760px, 100%);
  max-height: calc(100vh - 48px);
  margin: 48px 0 0;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.2);
  padding: 20px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.search-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 16px;
}

.search-label {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
}

.search-help,
.search-status,
.search-result-meta,
.search-result-snippet {
  color: var(--color-text-secondary);
}

.search-help,
.search-status,
.search-result-meta {
  font-size: 14px;
}

.search-input-wrap {
  display: block;
  flex: 0 0 auto;
}

.search-input {
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-bg);
  color: var(--color-text);
  padding: 14px 16px;
  font: inherit;
  margin-bottom: 12px;
}

.search-input:focus {
  outline: 2px solid var(--color-text-secondary);
  outline-offset: 2px;
}

.search-results {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  flex: 1 1 auto;
  overflow-y: auto;
  min-height: 0;
  padding-right: 4px;
}

.search-result-item + .search-result-item {
  margin-top: 10px;
}

.search-result-link {
  display: block;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 14px 16px;
  text-decoration: none;
  color: var(--color-text);
  transition: background 0.15s, border-color 0.15s;
}

.search-result-link:hover {
  background: var(--color-hover-bg);
  border-color: var(--color-text-secondary);
}

.search-result-title {
  font-weight: 600;
  margin: 4px 0 6px;
}

.search-result-detail {
  margin: -2px 0 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-text-secondary);
}

.search-result-snippet {
  font-size: 15px;
  line-height: 1.5;
}

body.search-open {
  overflow: hidden;
}

/* === Reference === */
.reference-page {
  --reference-width: 860px;
}

.reference-page main,
main .reference-page {
  max-width: var(--reference-width);
}

.reference-page .page-header h1,
.reference-page.section-page .page-header h1 {
  margin-bottom: 14px;
}

.reference-page .content {
  font-size: 1rem;
}

.reference-page .content h2 {
  margin-top: 56px;
  padding-top: 18px;
  border-top: 1px solid var(--color-border);
}

.reference-page .content h3 {
  margin-top: 28px;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
}

.reference-page .content p + table,
.reference-page .content p + pre,
.reference-page .content p + ul,
.reference-page .content p + ol {
  margin-top: -6px;
}

.reference-page .content table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0 28px;
  font-size: 0.95rem;
  display: block;
  overflow-x: auto;
}

.reference-page .content table thead th {
  position: sticky;
  top: 0;
  background: var(--color-bg);
  z-index: 1;
}

.reference-page .content th,
.reference-page .content td {
  text-align: left;
  vertical-align: top;
  padding: 10px 12px;
  border-bottom: 1px solid var(--color-border);
}

.reference-page .content th {
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-secondary);
}

.reference-page .content tbody tr:nth-child(even) td {
  background: var(--color-hover-bg);
}

.reference-page .content pre {
  margin: 14px 0 24px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.reference-page .content code {
  font-size: 0.84em;
}

.reference-page .content pre code {
  font-size: 0.9rem;
}

.reference-page .content pre code.language-sh,
.reference-page .content pre code.language-text {
  color: var(--color-text);
}

.reference-page .content pre code.language-sh::before {
  content: "shell";
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.reference-page .content pre code.language-froth::before {
  content: "froth";
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.reference-page.page-words .content > p {
  margin-bottom: 14px;
}

.ref-entry {
  position: relative;
  border: 1px solid var(--color-border);
  border-radius: 14px;
  padding: 18px 18px 2px;
  margin: 18px 0 22px;
  scroll-margin-top: 96px;
  background:
    linear-gradient(180deg, var(--color-hover-bg), transparent 44%),
    var(--color-bg);
}

.ref-entry > :first-child {
  margin-top: 0;
}

.ref-entry-signature {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 12px;
  padding-right: 88px;
  margin-bottom: 12px;
  line-height: 1.45;
}

.ref-entry-signature strong {
  display: inline-flex;
  align-items: baseline;
}

.ref-entry-signature strong code {
  font-size: 1.18rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-text);
  background: none;
  padding: 0;
}

.ref-entry-signature > code:last-child {
  color: var(--color-text-secondary);
  background: none;
  padding: 0;
  font-size: 0.92rem;
}

.ref-entry-badge {
  position: absolute;
  top: -2px;
  right: 0;
  margin: 0;
  padding: 3px 8px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-style: normal;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  opacity: 0.78;
  background: var(--color-bg);
}

.ref-entry .ref-block-label {
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
}

.ref-entry pre {
  margin-top: 0;
}

.ref-entry > hr {
  margin: 18px 0;
}

.ref-table-wrap {
  margin: 18px 0 28px;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: 12px;
}

.ref-table-wrap table {
  margin: 0;
  border: 0;
}

.ref-table-wrap table th,
.ref-table-wrap table td {
  min-width: 140px;
}

/* === Responsive === */
@media (max-width: 640px) {
  html { font-size: 16px; }
  .site-header nav {
    padding: 10px 16px;
    align-items: flex-start;
    flex-wrap: wrap;
  }
  .nav-links {
    gap: 14px;
    width: 100%;
    order: 3;
  }
  .nav-links a { font-size: 13px; }
  .nav-controls {
    gap: 8px;
  }
  .search-shortcut {
    display: none;
  }
  .search-dialog {
    max-height: calc(100vh - 32px);
    margin: 0;
    padding: 16px;
  }
  .home-hero {
    margin-bottom: 28px;
  }
  .ref-entry {
    padding: 14px 14px 0;
    border-radius: 12px;
  }
  .ref-entry-signature {
    padding-right: 72px;
    gap: 8px 10px;
  }
  .ref-entry-signature strong code {
    font-size: 1.06rem;
  }
  main { padding: 32px 16px 64px; }
  .content h1 { font-size: 1.6rem; }
  .content h2 { font-size: 1.2rem; }
}