:root {
  --fg: #f2f4f8;
  --fg-soft: #aeb6c8;
  --muted: #8b93a7;
  --faint: #5c6579;
  --bg: #101218;
  --bg-raise: #161923;
  --bg-code: #0c0e14;
  --surface: #1c2130;
  --border: #262c3d;
  --border-soft: #1f2433;
  --accent: #e8843c;
  --accent-hover: #f29a5b;
  --accent-fg: #1a120a;
  --success: #4ec28f;
  --warning: #e8b33c;
  --error: #e8635a;
  --c1: #e8843c;
  --c2: #5ea8d8;
  --c3: #4ec28f;
  --c4: #b48ce0;
  --c5: #e8b33c;
  --c6: #e8635a;
  --diag-node-fill: var(--bg-raise);
  --diag-node-stroke: var(--border);
  --diag-accent-stroke: var(--accent);
  --diag-arrow: var(--muted);
  --focus-ring: 0 0 0 2px var(--bg), 0 0 0 4px var(--accent);
  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --maxw: 1040px;
  --radius: 8px;
}

@media (prefers-color-scheme: light) {
  :root {
    --fg: #1a1f2b;
    --fg-soft: #3c4456;
    --muted: #5c6579;
    --faint: #8b93a7;
    --bg: #fafbfc;
    --bg-raise: #f1f3f6;
    --bg-code: #f4f5f8;
    --surface: #eef0f4;
    --border: #d5dae3;
    --border-soft: #e2e6ed;
    --accent: #c96a24;
    --accent-hover: #b0581a;
    --accent-fg: #ffffff;
    --success: #2c8a5c;
    --warning: #a37514;
    --error: #b8423a;
    --focus-ring: 0 0 0 2px var(--bg), 0 0 0 4px var(--accent);
  }
}

/* Manual theme override (JS toggle) */
html[data-theme="dark"] {
  --fg: #f2f4f8; --fg-soft: #aeb6c8; --muted: #8b93a7; --faint: #5c6579;
  --bg: #101218; --bg-raise: #161923; --bg-code: #0c0e14; --surface: #1c2130;
  --border: #262c3d; --border-soft: #1f2433; --accent: #e8843c; --accent-hover: #f29a5b;
  --accent-fg: #1a120a; --success: #4ec28f; --warning: #e8b33c; --error: #e8635a;
  --focus-ring: 0 0 0 2px var(--bg), 0 0 0 4px var(--accent);
}
html[data-theme="light"] {
  --fg: #1a1f2b; --fg-soft: #3c4456; --muted: #5c6579; --faint: #8b93a7;
  --bg: #fafbfc; --bg-raise: #f1f3f6; --bg-code: #f4f5f8; --surface: #eef0f4;
  --border: #d5dae3; --border-soft: #e2e6ed; --accent: #c96a24; --accent-hover: #b0581a;
  --accent-fg: #ffffff; --success: #2c8a5c; --warning: #a37514; --error: #b8423a;
  --focus-ring: 0 0 0 2px var(--bg), 0 0 0 4px var(--accent);
}

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 4.5rem;
  overflow-x: hidden;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ---------- Layout ---------- */
.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.25rem;
}

section { padding: 3.5rem 0; }
section + section { border-top: 1px solid var(--border-soft); }

h1, h2, h3 { line-height: 1.25; letter-spacing: -0.015em; margin: 0 0 0.75em; }
h1 { font-size: clamp(2rem, 5vw, 3rem); font-weight: 700; }
h2 { font-size: clamp(1.5rem, 3.2vw, 2rem); font-weight: 700; }
h3 { font-size: 1.125rem; font-weight: 600; }

p { margin: 0 0 1em; }

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; }
a:focus-visible, button:focus-visible, [tabindex]:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: 4px;
}

.mono, code, pre, kbd { font-family: var(--font-mono); }

.lead { font-size: 1.125rem; color: var(--fg-soft); max-width: 60ch; }

.section-kicker {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 0.75rem;
  display: block;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-soft);
}
.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1.25rem;
  padding: 0.75rem 1.25rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--fg);
  text-decoration: none;
  margin-right: auto;
}
.brand:hover { text-decoration: none; }
.brand svg { width: 26px; height: 26px; color: var(--accent); flex: none; }
.brand .brand-sep { color: var(--faint); font-weight: 400; }

.site-nav { display: flex; flex-wrap: wrap; gap: 0.25rem 0.125rem; align-items: center; }
.site-nav a {
  color: var(--fg-soft);
  font-size: 0.9rem;
  padding: 0.35rem 0.6rem;
  border-radius: 6px;
  text-decoration: none;
}
.site-nav a:hover { color: var(--fg); background: var(--surface); text-decoration: none; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.55rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  color: var(--fg);
  background: var(--bg-raise);
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, transform 0.15s;
}
.btn:hover { background: var(--surface); border-color: var(--muted); text-decoration: none; transform: translateY(-1px); }
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-fg);
}
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: var(--accent-fg); }
.btn-gh { margin-left: 0.25rem; }
.btn .gh-oct { width: 18px; height: 18px; flex: none; }

/* CSS-only mobile menu (no JS). The checkbox is the state; the label is the visible button. */
input.nav-toggle-state { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
/* The visible button is hidden at widths where the horizontal menu fits; the
   @media (max-width: 760px) block below re-enables it for the collapsed menu. */
label.nav-toggle { display: none; }

@media (max-width: 760px) {
  .header-inner { padding: 0.6rem 1.25rem; }
  .brand { margin-right: 0; }
  .btn-gh { display: none; }
  .site-nav {
    order: 3;
    flex-basis: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0.1rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
  }
  .site-nav a { padding: 0.55rem 0.75rem; }
  label.nav-toggle {
    order: 2;
    margin-left: auto;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--fg-soft);
    background: var(--bg-raise);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0.35rem 0.7rem;
    cursor: pointer;
    user-select: none;
  }
  label.nav-toggle:focus-within { box-shadow: var(--focus-ring); }
  input.nav-toggle-state:checked ~ .site-nav { max-height: 30rem; }
  label.nav-toggle .nav-toggle-icon { transition: transform 0.2s; display: inline-block; }
  input.nav-toggle-state:checked ~ label.nav-toggle .nav-toggle-icon { transform: rotate(90deg); }
}

/* ---------- Hero ---------- */
.hero { padding: 4rem 0 3rem; }
.hero h1 { margin-bottom: 1rem; max-width: 24ch; }
.hero .lead { margin-bottom: 1.75rem; }
.hero-ctas { display: flex; flex-wrap: wrap; gap: 0.75rem; align-items: center; margin-bottom: 1.5rem; }

.pull-line {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 0;
  max-width: 560px;
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 0.9rem;
}
.pull-line .prompt {
  padding: 0.7rem 0.85rem;
  color: var(--faint);
  user-select: none;
  border-right: 1px solid var(--border-soft);
}
.pull-line code { padding: 0.7rem 0.85rem; margin: 0; color: var(--fg); flex: 1; overflow-x: auto; }

.chips { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1.5rem; }
.chip {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--fg-soft);
  background: var(--bg-raise);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.3rem 0.8rem;
  white-space: nowrap;
}
.chip .dot { color: var(--accent); margin-right: 0.4em; }

/* ---------- Idea: three points ---------- */
.three { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; counter-reset: idea; }
.three .point {
  background: var(--bg-raise);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 1.25rem 1.25rem 1.1rem;
}
.three .point::before {
  counter-increment: idea;
  content: "0" counter(idea);
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 0.6rem;
}
.three .point h3 { margin-bottom: 0.4rem; }
.three .point p { color: var(--fg-soft); font-size: 0.95rem; margin: 0; }
@media (max-width: 820px) { .three { grid-template-columns: 1fr; } }

/* ---------- Features grid ---------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
}
.feat {
  background: var(--bg-raise);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 1.1rem 1.2rem;
  transition: border-color 0.15s, transform 0.15s;
}
.feat:hover { border-color: var(--border); transform: translateY(-2px); }
.feat h3 { font-size: 1rem; margin-bottom: 0.35rem; display: flex; align-items: center; gap: 0.5rem; }
.feat h3 .icon { color: var(--accent); font-size: 0.9rem; flex: none; width: 1.2em; text-align: center; }
.feat p { color: var(--fg-soft); font-size: 0.9rem; margin: 0; }

/* ---------- Diagram ---------- */
.diagram-wrap {
  background: var(--bg-raise);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 1.5rem;
  overflow-x: auto;
  margin-bottom: 1.5rem;
}
.diagram { width: 100%; min-width: 640px; height: auto; display: block; }
.diagram .node rect { fill: var(--diag-node-fill); stroke: var(--diag-node-stroke); stroke-width: 1.5; }
.diagram .accent-node rect { stroke: var(--diag-accent-stroke); }
.diagram .mono { font-family: var(--font-mono); font-size: 15px; fill: var(--fg); text-anchor: middle; }
.diagram .mono.small { font-size: 12.5px; }
.diagram .faint { fill: var(--faint); }
.diagram .small { font-size: 12.5px; }
.diagram text { text-anchor: middle; }
.diagram .edge { stroke: var(--diag-arrow); stroke-width: 1.5; fill: none; }
.diagram .edge.dashed { stroke-dasharray: 5 4; }
.diagram .left { text-anchor: start; }
.diagram .frame rect { fill: none; stroke: var(--diag-node-stroke); stroke-width: 1; stroke-dasharray: 4 4; }
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; counter-reset: step; }
.step { position: relative; padding-top: 2.2rem; }
.step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  top: 0; left: 0;
  width: 1.6rem; height: 1.6rem;
  display: grid; place-items: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  background: var(--bg-raise);
  border: 1px solid var(--accent);
  border-radius: 50%;
}
.step h3 { font-size: 0.95rem; margin-bottom: 0.25rem; }
.step p { font-size: 0.875rem; color: var(--fg-soft); margin: 0; }
@media (max-width: 820px) { .steps { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px) { .steps { grid-template-columns: 1fr; } }

/* ---------- Code blocks ---------- */
.codeblock {
  position: relative;
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin: 0 0 1rem;
}
.codeblock pre {
  margin: 0;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.55;
  color: var(--fg);
  tab-size: 2;
}
.codeblock pre code { background: none; padding: 0; border: none; }
.codeblock .cb-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--faint);
  padding: 0.55rem 1.1rem;
  border-bottom: 1px solid var(--border-soft);
  user-select: none;
}
.codeblock .cb-label .fname { color: var(--fg-soft); text-transform: none; letter-spacing: 0; }

.copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--fg-soft);
  background: var(--bg-raise);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.3rem 0.65rem;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s, background 0.15s;
}
.codeblock:hover .copy-btn, .copy-btn:focus-visible { opacity: 1; }
.copy-btn:hover { background: var(--surface); color: var(--fg); }
.copy-btn.done { color: var(--success); border-color: var(--success); }
.no-js .copy-btn { display: none; }
.copy-status {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* Syntax highlighting (hand-rolled) */
.tk-com { color: var(--faint); font-style: italic; }
.tk-str { color: var(--c3); }
.tk-key { color: var(--c2); }
.tk-fn  { color: var(--c4); }
.tk-flag { color: var(--c5); }
.tk-var { color: var(--accent); }
.tk-cmd { color: var(--fg); }
.tk-prompt { color: var(--faint); user-select: none; }
.tk-note { color: var(--muted); font-style: italic; }

code {
  background: var(--bg-raise);
  border: 1px solid var(--border-soft);
  border-radius: 4px;
  padding: 0.1em 0.35em;
  font-size: 0.875em;
  color: var(--fg);
  overflow-wrap: anywhere;
}

/* ---------- Tabs (stacked by default, tabbed with JS) ---------- */
.tabs { display: block; }
.tabs .tablist {
  display: none;
  gap: 0.25rem;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--border-soft);
  margin-bottom: 1rem;
}
.tabs.js-tabs .tablist { display: flex; }
.tabs.js-tabs .panel { display: none; }
.tabs.js-tabs .panel.active { display: block; }
.tab-btn {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--fg-soft);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 0.5rem 0.85rem;
  cursor: pointer;
  margin-bottom: -1px;
}
.tab-btn:hover { color: var(--fg); }
.tab-btn[aria-selected="true"] { color: var(--accent); border-bottom-color: var(--accent); }
.tabs .panel .tab-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--faint);
  margin-bottom: 0.75rem;
}
.tabs.js-tabs .panel .tab-label { display: none; }
.tabs.js-tabs .panel .codeblock .cb-label { display: none; }

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--border-soft); border-radius: var(--radius); }
table { border-collapse: collapse; width: 100%; font-size: 0.9rem; }
caption { text-align: left; font-family: var(--font-mono); font-size: 0.78rem; color: var(--faint); padding: 0.6rem 1rem; border-bottom: 1px solid var(--border-soft); }
th, td { text-align: left; padding: 0.6rem 1rem; vertical-align: top; border-bottom: 1px solid var(--border-soft); }
th { font-weight: 600; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); }
tr:last-child td { border-bottom: none; }
tbody tr:hover { background: var(--bg-raise); }
td code { font-size: 0.82em; }

/* ---------- Fit check ---------- */
.fit { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }
.fit-col {
  border-radius: var(--radius);
  padding: 1.25rem 1.4rem;
  border: 1px solid var(--border-soft);
  background: var(--bg-raise);
}
.fit-col h3 { display: flex; align-items: center; gap: 0.5rem; }
.fit-col.use h3 { color: var(--success); }
.fit-col.avoid h3 { color: var(--warning); }
.fit-col ul { margin: 0.5rem 0 0; padding-left: 1.25rem; }
.fit-col li { margin-bottom: 0.5rem; color: var(--fg-soft); font-size: 0.92rem; }
.fit-col li::marker { color: var(--faint); }
@media (max-width: 700px) { .fit { grid-template-columns: 1fr; } }

/* ---------- Examples list ---------- */
.examples-list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }
@media (max-width: 700px) { .examples-list { grid-template-columns: 1fr; } }
.examples-list li {
  background: var(--bg-raise);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 0.9rem 1.1rem;
}
.examples-list .ex-name { font-family: var(--font-mono); font-weight: 700; font-size: 0.9rem; }
.examples-list .ex-name a { color: var(--fg); }
.examples-list .ex-desc { color: var(--fg-soft); font-size: 0.875rem; margin: 0.25rem 0 0; }

/* ---------- FAQ ---------- */
.faq details {
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  background: var(--bg-raise);
  margin-bottom: 0.75rem;
  overflow: hidden;
}
.faq summary {
  cursor: pointer;
  padding: 0.9rem 1.15rem;
  font-weight: 600;
  font-size: 0.95rem;
  list-style: none;
  position: relative;
  padding-right: 2.5rem;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  position: absolute;
  right: 1.15rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  color: var(--accent);
  transition: transform 0.2s;
}
.faq details[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.faq details .faq-body { padding: 0 1.15rem 1rem; color: var(--fg-soft); font-size: 0.92rem; }
.faq details .faq-body p:last-child { margin-bottom: 0; }

/* ---------- Security ---------- */
.security-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1rem; }
.sec-card {
  background: var(--bg-raise);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 1.1rem 1.2rem;
}
.sec-card h3 { font-size: 0.95rem; margin-bottom: 0.5rem; }
.sec-card ul { margin: 0; padding-left: 1.2rem; }
.sec-card li { font-size: 0.875rem; color: var(--fg-soft); margin-bottom: 0.4rem; }
.sec-card li::marker { color: var(--faint); }

/* ---------- About ---------- */
.about p { max-width: 75ch; }
.about .note {
  background: var(--bg-raise);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 1rem 1.25rem;
  margin: 1.25rem 0;
  font-size: 0.92rem;
  color: var(--fg-soft);
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border-soft);
  padding: 2.5rem 0 2rem;
  margin-top: 2rem;
  background: var(--bg-raise);
}
.footer-grid { display: flex; flex-wrap: wrap; gap: 1rem 2.5rem; align-items: flex-start; justify-content: space-between; }
.footer-brand { display: flex; align-items: center; gap: 0.5rem; font-family: var(--font-mono); font-weight: 700; }
.footer-brand svg { width: 22px; height: 22px; color: var(--accent); }
.footer-links { display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem; }
.footer-links a { color: var(--fg-soft); font-size: 0.875rem; }
.footer-links a:hover { color: var(--fg); }
.footer-meta { width: 100%; margin-top: 1rem; padding-top: 1rem; border-top: 1px solid var(--border-soft); font-size: 0.8rem; color: var(--muted); }
.footer-meta p { margin: 0 0 0.35rem; max-width: 75ch; }

/* ---------- 404 ---------- */
.notfound { min-height: 60vh; display: grid; place-items: center; text-align: center; padding: 4rem 1.25rem; }
.notfound .nf-code { font-family: var(--font-mono); font-size: 4rem; font-weight: 700; color: var(--accent); line-height: 1; }
.notfound h1 { font-size: 1.5rem; margin-top: 1rem; }
.notfound p { color: var(--fg-soft); max-width: 45ch; margin: 0 auto 1.5rem; }

/* ---------- Imprint ---------- */
.imprint .doc { max-width: 70ch; }
.placeholder {
  background: var(--bg-raise);
  border: 1px dashed var(--warning);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  color: var(--fg-soft);
  font-size: 0.92rem;
  margin: 0.75rem 0;
}
.placeholder .ph-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--warning);
  margin-bottom: 0.4rem;
}

/* ---------- Utility ---------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: var(--accent-fg);
  padding: 0.6rem 1rem;
  border-radius: 0 0 8px 0;
  z-index: 100;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}
.skip-link:focus { left: 0; }

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.gap-block { margin-top: 2rem; }

/* Theme toggle (JS) */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--fg-soft);
  background: var(--bg-raise);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.35rem 0.7rem;
  cursor: pointer;
}
.theme-toggle:hover { background: var(--surface); color: var(--fg); }
.theme-toggle .icon-sun, .theme-toggle .icon-moon { display: none; }
html[data-theme="dark"] .theme-toggle .icon-moon { display: inline; }
html[data-theme="light"] .theme-toggle .icon-sun { display: inline; }
/* Follow the system theme when there is no explicit override (e.g. first visit) */
@media (prefers-color-scheme: dark) {
  html:not([data-theme]) .theme-toggle .icon-moon { display: inline; }
}
@media (prefers-color-scheme: light) {
  html:not([data-theme]) .theme-toggle .icon-sun { display: inline; }
}
/* Visually hidden, still accessible to screen readers */
.sr-only, .sr-text {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* Selection */
::selection { background: color-mix(in srgb, var(--accent) 35%, transparent); }