/* Zeetah playground: tokens first, then layout, editors, panels. */

:root {
  --bg: #f4f5f7;
  --surface: #ffffff;
  --surface-2: #f1f3f6;
  --surface-3: #e5e8ed;
  --border: #dde1e7;
  --border-strong: #c5cbd4;
  --text: #191d23;
  --muted: #5b6573;
  --faint: #8a939f;
  --accent: #f7a41d;
  --accent-ink: #9a5800;
  --accent-soft: rgba(247, 164, 29, 0.18);
  --danger: #c4362d;
  --danger-soft: rgba(196, 54, 45, 0.09);
  --ok: #1a7f46;
  --ok-soft: rgba(26, 127, 70, 0.1);
  --warn: #9a5800;
  --warn-soft: rgba(247, 164, 29, 0.14);
  --m0: rgba(247, 164, 29, 0.32);
  --m1: rgba(56, 132, 255, 0.22);
  --msel: #d97f00;
  --g1: #2f6fe4;
  --g2: #148a3d;
  --g3: #b23ac9;
  --g4: #d2560c;
  --g5: #0a879e;
  --g6: #a87200;
  --tok-escape: #0b5fc0;
  --tok-class: #137a3a;
  --tok-quant: #7434d8;
  --tok-anchor: #b04a06;
  --tok-alt: #c0245a;
  --tok-backref: #0b7d91;
  --tok-comment: #8a939f;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.04), 0 1px 3px rgba(16, 24, 40, 0.06);
  --menu-shadow: 0 12px 32px rgba(16, 24, 40, 0.16);
  --radius: 12px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0d1015;
    --surface: #14181f;
    --surface-2: #1b2028;
    --surface-3: #252c36;
    --border: #272e38;
    --border-strong: #38414d;
    --text: #e4e7eb;
    --muted: #9aa3af;
    --faint: #6b7480;
    --accent: #f7a41d;
    --accent-ink: #f7b955;
    --accent-soft: rgba(247, 164, 29, 0.16);
    --danger: #ff6f64;
    --danger-soft: rgba(255, 111, 100, 0.1);
    --ok: #4cc983;
    --ok-soft: rgba(76, 201, 131, 0.1);
    --warn: #f2b14f;
    --warn-soft: rgba(242, 177, 79, 0.12);
    --m0: rgba(247, 164, 29, 0.3);
    --m1: rgba(88, 160, 255, 0.28);
    --msel: #f7a41d;
    --g1: #6aa5ff;
    --g2: #4fd27e;
    --g3: #e07cf5;
    --g4: #ff9a57;
    --g5: #38d0e6;
    --g6: #f2c94c;
    --tok-escape: #6cb4ff;
    --tok-class: #5cd27a;
    --tok-quant: #c3a6ff;
    --tok-anchor: #ffa45c;
    --tok-alt: #ff7aa0;
    --tok-backref: #48d1e3;
    --tok-comment: #6b7480;
    --shadow: none;
    --menu-shadow: 0 12px 32px rgba(0, 0, 0, 0.5);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0d1015;
  --surface: #14181f;
  --surface-2: #1b2028;
  --surface-3: #252c36;
  --border: #272e38;
  --border-strong: #38414d;
  --text: #e4e7eb;
  --muted: #9aa3af;
  --faint: #6b7480;
  --accent: #f7a41d;
  --accent-ink: #f7b955;
  --accent-soft: rgba(247, 164, 29, 0.16);
  --danger: #ff6f64;
  --danger-soft: rgba(255, 111, 100, 0.1);
  --ok: #4cc983;
  --ok-soft: rgba(76, 201, 131, 0.1);
  --warn: #f2b14f;
  --warn-soft: rgba(242, 177, 79, 0.12);
  --m0: rgba(247, 164, 29, 0.3);
  --m1: rgba(88, 160, 255, 0.28);
  --msel: #f7a41d;
  --g1: #6aa5ff;
  --g2: #4fd27e;
  --g3: #e07cf5;
  --g4: #ff9a57;
  --g5: #38d0e6;
  --g6: #f2c94c;
  --tok-escape: #6cb4ff;
  --tok-class: #5cd27a;
  --tok-quant: #c3a6ff;
  --tok-anchor: #ffa45c;
  --tok-alt: #ff7aa0;
  --tok-backref: #48d1e3;
  --tok-comment: #6b7480;
  --shadow: none;
  --menu-shadow: 0 12px 32px rgba(0, 0, 0, 0.5);
  color-scheme: dark;
}

/* --- base ------------------------------------------------------------------ */

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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.5 var(--sans);
}

code {
  font-family: var(--mono);
  font-size: 0.92em;
}

button {
  font: inherit;
  color: inherit;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

svg {
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

[hidden] {
  display: none !important;
}

/* --- top bar ----------------------------------------------------------------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 24px;
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  backdrop-filter: saturate(1.4) blur(8px);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: inherit;
  text-decoration: none;
}

.nav {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0 auto 0 14px;
}

.nav a {
  padding: 6px 11px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
}

.nav a:hover {
  color: var(--text);
  background: var(--surface-2);
}

.nav a[aria-current="page"] {
  color: var(--text);
  background: var(--surface-2);
}

/* The cheetah head from docs/zeetah.png, framed like an app icon. */
.logo {
  width: 40px;
  height: 40px;
  flex: none;
  border-radius: 11px;
  object-fit: cover;
  box-shadow:
    0 0 0 1px rgba(0, 0, 0, 0.18),
    0 2px 10px -2px rgba(255, 106, 26, 0.45),
    0 2px 10px -4px rgba(70, 196, 126, 0.5);
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

/* Wordmark after the ZEETAH lettering: heavy, slanted, orange into green. */
.brand-name {
  display: inline-block;
  align-self: flex-start; /* gradient spans the letters, not the subtitle width */
  font: italic 900 21px/1 var(--sans);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  transform: skewX(-6deg);
  background: linear-gradient(100deg, #ff4f17 0%, #ff8a1e 36%, #c7d046 58%, #5fcf7c 76%, #2fae6e 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 1px 0 rgba(0, 0, 0, 0.28));
  padding-right: 2px;
}

.brand-sub {
  font-size: 12px;
  color: var(--muted);
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.chip {
  font: 12px var(--mono);
  padding: 2px 9px;
  border-radius: 999px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--muted);
  white-space: nowrap;
}

.link {
  color: var(--muted);
  text-decoration: none;
  font-size: 13px;
}

.link:hover {
  color: var(--text);
}

/* --- layout -------------------------------------------------------------------- */

.page {
  max-width: 1480px;
  margin: 0 auto;
  padding: 0 24px;
}

.hero {
  padding: 22px 0 14px;
}

.hero h1 {
  margin: 0 0 4px;
  font-size: 24px;
  font-weight: 750;
  letter-spacing: -0.01em;
}

.hero p {
  max-width: 860px;
  margin: 0;
  color: var(--muted);
  font-size: 14.5px;
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 380px;
  gap: 20px;
  padding-bottom: 20px;
  align-items: start;
}

.col-main,
.col-side {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
}

.col-side {
  position: sticky;
  top: 72px;
  max-height: calc(100vh - 88px);
  overflow-y: auto;
  scrollbar-width: thin;
  padding-bottom: 2px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 14px 16px 16px;
  min-width: 0;
}

.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
  min-height: 30px;
}

.card-head h2 {
  margin: 0;
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
}

.meta {
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0;
  text-transform: none;
  color: var(--faint);
  margin-left: 6px;
}

.actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* --- buttons -------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 30px;
  padding: 0 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font: 500 13px var(--sans);
  cursor: pointer;
  white-space: nowrap;
}

.btn:hover {
  background: var(--surface-2);
  border-color: var(--border-strong);
}

.btn:disabled {
  opacity: 0.55;
  cursor: progress;
}

.btn svg {
  width: 15px;
  height: 15px;
}

.btn .chev {
  width: 14px;
  height: 14px;
  margin-right: -4px;
  color: var(--muted);
}

.btn.small {
  height: 26px;
  padding: 0 10px;
  font-size: 12px;
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  padding: 0;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}

.icon-btn:hover:not(:disabled) {
  background: var(--surface-2);
  color: var(--text);
}

.icon-btn:disabled {
  opacity: 0.35;
  cursor: default;
}

.icon-btn svg {
  width: 17px;
  height: 17px;
}

.check {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--muted);
  cursor: pointer;
  user-select: none;
}

.check input {
  accent-color: var(--accent);
  margin: 0;
}

/* --- overlay editors --------------------------------------------------------------
 * A transparent <textarea> sits over a highlight layer (.hl) that mirrors its
 * text exactly. Both share every metric that affects layout. */

.editor {
  position: relative;
  font-family: var(--mono);
  font-size: 14px;
  line-height: 22px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.editor:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.editor .hl,
.editor textarea {
  margin: 0;
  border: 0;
  padding: 10px 12px;
  font: inherit;
  line-height: inherit;
  letter-spacing: 0;
  tab-size: 4;
  white-space: pre-wrap;
  overflow-wrap: break-word;
  word-break: normal;
  font-variant-ligatures: none;
  font-kerning: none;
}

.editor .hl {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  color: transparent;
  pointer-events: none;
}

.editor textarea {
  position: relative;
  display: block;
  width: 100%;
  resize: none;
  overflow: hidden;
  background: transparent;
  color: var(--text);
  caret-color: var(--text);
  outline: none;
}

.editor textarea::placeholder {
  color: var(--faint);
}

.pattern-row {
  display: flex;
  align-items: flex-start;
  gap: 6px;
}

.delim {
  font: 20px/44px var(--mono);
  color: var(--faint);
  user-select: none;
}

.flag-text {
  min-width: 3ch;
  font: 15px/44px var(--mono);
  color: var(--accent-ink);
  user-select: none;
}

.pattern-editor {
  flex: 1;
  min-width: 0;
  font-size: 15px;
}

.pattern-editor .hl {
  color: var(--text);
}

.pattern-editor textarea {
  color: transparent;
}

.pattern-editor textarea::selection {
  background: color-mix(in srgb, var(--accent) 30%, transparent);
  color: transparent;
}

.subject-editor {
  height: 280px;
  min-height: 120px;
  max-height: 85vh;
  overflow: auto;
  resize: vertical;
}

.subject-editor textarea {
  min-height: 100%;
}

/* matches in the test string */
.hl mark {
  color: transparent;
  background: var(--m0);
  border-radius: 3px;
}

.hl mark.alt {
  background: var(--m1);
}

.hl mark.sel {
  box-shadow: 0 0 0 1.5px var(--msel);
}

.hl mark.zw {
  background: none;
  border-left: 2px solid var(--msel);
  margin-right: -2px;
  border-radius: 0;
}

.hl .g {
  border-radius: 2px;
  background: color-mix(in srgb, var(--gc) 26%, transparent);
  box-shadow: inset 0 -2px 0 var(--gc);
}

.g1 { --gc: var(--g1); }
.g2 { --gc: var(--g2); }
.g3 { --gc: var(--g3); }
.g4 { --gc: var(--g4); }
.g5 { --gc: var(--g5); }
.g6 { --gc: var(--g6); }

/* pattern syntax colors (colors and backgrounds only: never metrics) */
.t-escape { color: var(--tok-escape); }
.t-class,
.t-set { color: var(--tok-class); }
.t-quant,
.t-flags { color: var(--tok-quant); }
.t-anchor { color: var(--tok-anchor); }
.t-alt { color: var(--tok-alt); }
.t-backref { color: var(--tok-backref); }
.t-comment { color: var(--tok-comment); }
.t-dot { color: var(--tok-class); }
.t-open,
.t-close { color: var(--muted); }
.t-open.cap,
.t-close.cap,
.t-backref.cap { color: var(--gc); }

.t-error {
  color: var(--danger);
  background: var(--danger-soft);
  text-decoration: wavy underline var(--danger);
  text-underline-offset: 3px;
}

.hl .hot {
  background: color-mix(in srgb, var(--accent) 32%, transparent);
  border-radius: 3px;
}

/* --- flags and status ------------------------------------------------------------- */

.flags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
}

.flag {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  height: 28px;
  padding: 0 11px 0 4px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font-size: 12px;
  cursor: pointer;
}

.flag b {
  display: grid;
  place-items: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--surface-3);
  color: var(--text);
  font: 600 12px var(--mono);
}

.flag:hover {
  border-color: var(--border-strong);
  color: var(--text);
}

.flag[aria-pressed="true"] {
  border-color: color-mix(in srgb, var(--accent) 70%, transparent);
  background: var(--accent-soft);
  color: var(--text);
}

.flag[aria-pressed="true"] b {
  background: var(--accent);
  color: #1d1406;
}

.status {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 12px;
  margin-top: 12px;
  min-height: 26px;
  font-size: 13px;
  color: var(--muted);
}

.engine-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 9px;
  border-radius: 6px;
  font: 12px var(--mono);
  background: var(--ok-soft);
  color: var(--ok);
  border: 1px solid color-mix(in srgb, var(--ok) 28%, transparent);
  cursor: help;
}

.engine-chip.bt {
  background: var(--warn-soft);
  color: var(--warn);
  border-color: color-mix(in srgb, var(--warn) 30%, transparent);
}

.engine-chip::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

.stat b {
  color: var(--text);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.err-box {
  width: 100%;
  padding: 8px 12px;
  border-radius: 8px;
  background: var(--danger-soft);
  border: 1px solid color-mix(in srgb, var(--danger) 30%, transparent);
  color: var(--text);
  line-height: 1.45;
}

.err-box .err-name {
  font: 600 13px var(--mono);
  color: var(--danger);
  margin-right: 6px;
}

.err-box .err-hint {
  display: block;
  color: var(--muted);
  font-size: 12px;
  margin-top: 2px;
}

.idle {
  color: var(--faint);
}

/* --- test string footer + benchmark ---------------------------------------------------- */

.count {
  margin-right: 4px;
  font-size: 12px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.count.has {
  color: var(--text);
  font-weight: 600;
}

.count.none {
  color: var(--danger);
}

.card-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 16px;
  margin-top: 10px;
  font-size: 12px;
  color: var(--muted);
}

.exec-info b {
  color: var(--text);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.bench-ctl {
  display: flex;
  align-items: center;
  gap: 12px;
}

.bench-out {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 8px 28px;
  margin-top: 12px;
  padding: 12px 14px;
  border-radius: 8px;
  background: var(--surface-2);
}

.bench-out .metric {
  display: flex;
  flex-direction: column;
}

.bench-out .big {
  font: 650 20px/1.2 var(--mono);
  font-variant-numeric: tabular-nums;
  color: var(--text);
}

.bench-out .lbl {
  font-size: 12px;
  color: var(--muted);
}

.bench-out .note {
  flex-basis: 100%;
  font-size: 12px;
  color: var(--faint);
}

/* --- examples menu ------------------------------------------------------------------- */

.menu-wrap {
  position: relative;
}

.menu {
  position: absolute;
  right: 0;
  top: calc(100% + 6px);
  z-index: 40;
  width: min(440px, calc(100vw - 32px));
  max-height: min(70vh, 560px);
  overflow-y: auto;
  padding: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--menu-shadow);
}

.menu button {
  display: block;
  width: 100%;
  padding: 8px 10px;
  border: 0;
  border-radius: 8px;
  background: none;
  text-align: left;
  cursor: pointer;
}

.menu button:hover,
.menu button:focus-visible {
  background: var(--surface-2);
  outline: none;
}

.menu .m-top {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 13px;
  font-weight: 500;
}

.menu .m-engine {
  font: 11px var(--mono);
  color: var(--faint);
  white-space: nowrap;
}

.menu .m-pat {
  display: block;
  margin-top: 2px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font: 12px var(--mono);
  color: var(--muted);
}

/* --- result tabs -------------------------------------------------------------------- */

.results {
  padding-top: 4px;
}

.tabs {
  display: flex;
  gap: 2px;
  margin: 0 -16px 14px;
  padding: 0 10px;
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  scrollbar-width: none;
}

.tabs button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 11px 12px 10px;
  margin-bottom: -1px;
  border: 0;
  border-bottom: 2px solid transparent;
  background: none;
  color: var(--muted);
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
  cursor: pointer;
}

.tabs button:hover {
  color: var(--text);
}

.tabs button[aria-selected="true"] {
  color: var(--text);
  border-bottom-color: var(--accent);
}

.tabs .badge {
  min-width: 20px;
  padding: 0 6px;
  border-radius: 999px;
  background: var(--surface-3);
  color: var(--muted);
  font: 600 11px/18px var(--mono);
  text-align: center;
}

.matches {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 560px;
  overflow-y: auto;
  scrollbar-width: thin;
}

.match {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  cursor: pointer;
}

.match:hover {
  border-color: var(--border-strong);
}

.match.sel {
  border-color: var(--msel);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.match-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-width: 0;
}

.match .idx {
  min-width: 2.5ch;
  font: 600 12px var(--mono);
  color: var(--accent-ink);
}

.match .span,
.seg .span {
  font: 11px var(--mono);
  color: var(--faint);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.val {
  min-width: 0;
  font: 13px/1.45 var(--mono);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.groups {
  display: grid;
  grid-template-columns: auto auto minmax(0, 1fr);
  gap: 3px 12px;
  align-items: baseline;
  margin-top: 7px;
  padding-top: 7px;
  border-top: 1px dashed var(--border);
}

.gname {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font: 12px var(--mono);
  color: var(--muted);
  white-space: nowrap;
}

.gname::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gc, var(--faint));
}

.gspan {
  font: 11px var(--mono);
  color: var(--faint);
  white-space: nowrap;
}

.groups .val {
  font-size: 12px;
}

.ws {
  color: var(--faint);
}

.empty-val {
  color: var(--faint);
  font-style: italic;
}

.placeholder {
  padding: 20px 16px;
  border: 1px dashed var(--border);
  border-radius: 8px;
  color: var(--muted);
  text-align: center;
  font-size: 13px;
}

.placeholder.error {
  color: var(--danger);
  border-color: color-mix(in srgb, var(--danger) 40%, transparent);
}

.more {
  padding: 6px;
  font-size: 12px;
  color: var(--muted);
  text-align: center;
}

.field-label {
  display: block;
  margin-bottom: 5px;
  font-size: 12px;
  color: var(--muted);
}

.field {
  width: 100%;
  height: 38px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-2);
  color: var(--text);
  font-size: 14px;
}

.field.mono {
  font-family: var(--mono);
}

.field:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 18px;
  margin: 10px 0 14px;
  font-size: 12px;
  color: var(--muted);
}

.hint code {
  padding: 0 4px;
  border-radius: 4px;
  background: var(--surface-2);
  color: var(--text);
}

.out-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 6px;
  font-size: 12px;
  color: var(--muted);
}

.out {
  margin: 0;
  min-height: 44px;
  max-height: 460px;
  overflow: auto;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-2);
  font: 13px/1.6 var(--mono);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.out.code {
  max-height: 680px;
  white-space: pre;
  overflow-wrap: normal;
}

.out.code .k { color: var(--tok-quant); }
.out.code .s { color: var(--tok-class); }
.out.code .c { color: var(--faint); }
.out.code .b { color: var(--tok-escape); }

.segments {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-height: 520px;
  overflow-y: auto;
}

.seg {
  display: grid;
  grid-template-columns: 3ch auto minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.seg .idx {
  font: 600 12px var(--mono);
  color: var(--accent-ink);
}

/* --- explanation ---------------------------------------------------------------------- */

.engine-note {
  margin-bottom: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  background: var(--surface-2);
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.engine-note b {
  color: var(--text);
}

.engine-note code {
  color: var(--accent-ink);
}

.explain {
  display: flex;
  flex-direction: column;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
}

.explain li {
  display: grid;
  grid-template-columns: minmax(44px, max-content) minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding: 4px 6px 4px calc(6px + var(--depth, 0) * 14px);
  border-radius: 6px;
  background-image: linear-gradient(var(--border), var(--border));
  background-size: 1px 100%;
  background-repeat: no-repeat;
  background-position: calc(var(--depth, 0) * 14px - 4px) 0;
}

.explain li:not([style]) {
  background-image: none;
}

.explain li:hover {
  background-color: var(--surface-2);
}

.explain .tok {
  max-width: 150px;
  padding: 1px 6px;
  border-radius: 4px;
  background: var(--surface-2);
  font: 12px/1.5 var(--mono);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.explain li:hover .tok {
  background: var(--surface-3);
}

.explain .desc {
  color: var(--muted);
}

.explain li.err .desc {
  color: var(--danger);
}

/* --- quick reference ------------------------------------------------------------------- */

.ref details {
  border-top: 1px solid var(--border);
}

.ref details:first-child {
  border-top: 0;
}

.ref summary {
  display: flex;
  justify-content: space-between;
  padding: 9px 2px;
  list-style: none;
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
  cursor: pointer;
}

.ref summary::-webkit-details-marker {
  display: none;
}

.ref summary::after {
  content: "+";
  font-weight: 400;
  color: var(--faint);
}

.ref details[open] summary::after {
  content: "−";
}

.ref-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
  padding-bottom: 8px;
}

.ref-item {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding: 5px 6px;
  border: 0;
  border-radius: 6px;
  background: none;
  text-align: left;
  cursor: pointer;
}

.ref-item:hover {
  background: var(--surface-2);
}

.ref-item code {
  font-size: 12px;
  color: var(--accent-ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.ref-item span {
  color: var(--muted);
  font-size: 13px;
}

/* --- footer / toast ----------------------------------------------------------------------- */

.foot {
  max-width: 1480px;
  margin: 0 auto;
  padding: 0 24px 28px;
  color: var(--faint);
  font-size: 12px;
  line-height: 1.6;
}

.foot p {
  margin: 0 0 6px;
}

.foot a {
  color: var(--muted);
  text-decoration: none;
}

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

.foot code {
  color: var(--muted);
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  z-index: 50;
  padding: 8px 14px;
  border-radius: 8px;
  background: var(--text);
  color: var(--surface);
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 12px);
  transition: opacity 0.18s, transform 0.18s;
}

.toast.show {
  opacity: 1;
  transform: translate(-50%, 0);
}

/* --- about + FAQ (tester page) ---------------------------------------------------- */

.about {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr);
  gap: 20px;
  margin: 12px 0 32px;
  align-items: start;
}

.about > div {
  padding: 18px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.about h2 {
  margin: 0 0 10px;
  font-size: 18px;
  letter-spacing: -0.01em;
}

.about p {
  margin: 0 0 10px;
  color: var(--muted);
}

.about a:not(.btn) {
  color: var(--tok-escape);
}

.facts {
  margin: 0 0 16px;
  padding-left: 18px;
  color: var(--muted);
}

.facts li {
  margin: 6px 0;
}

.facts b {
  color: var(--text);
}

.about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.about-links .btn {
  text-decoration: none;
}

.faq-item h3 {
  margin: 16px 0 4px;
  font-size: 14.5px;
}

.faq h2 + .faq-item h3 {
  margin-top: 4px;
}

.faq-item p {
  margin: 0;
  font-size: 14px;
}

/* --- documentation pages --------------------------------------------------------- */

.doc-page {
  max-width: 1180px;
  margin: 0 auto;
  padding: 18px 24px 8px;
}

.crumbs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  font-size: 13px;
  color: var(--faint);
}

.crumbs a {
  color: var(--muted);
  text-decoration: none;
}

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

.doc-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 230px;
  gap: 48px;
  align-items: start;
}

.doc {
  min-width: 0;
  max-width: 780px;
  font-size: 15.5px;
  line-height: 1.7;
}

.doc h1 {
  margin: 0 0 14px;
  font-size: 34px;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.doc .lede {
  margin: 0 0 10px;
  font-size: 17.5px;
  color: var(--muted);
}

.doc .lede strong {
  color: var(--text);
}

.doc-meta {
  margin: 0 0 28px;
  font-size: 13px;
  color: var(--faint);
}

.doc h2 {
  margin: 44px 0 12px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-size: 23px;
  letter-spacing: -0.01em;
  line-height: 1.3;
  scroll-margin-top: 76px;
}

.doc p,
.doc ul,
.doc ol {
  margin: 0 0 14px;
}

.doc li {
  margin: 5px 0;
}

.doc a {
  color: var(--tok-escape);
}

.doc :not(pre) > code {
  padding: 0.05em 0.35em;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: var(--surface-2);
  font-size: 0.86em;
  white-space: nowrap;
}

.doc pre {
  position: relative;
  margin: 0 0 16px;
  padding: 14px 16px;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  font: 13.5px/1.6 var(--mono);
}

.doc pre code {
  font: inherit;
}

.doc pre .k { color: var(--tok-quant); }
.doc pre .s { color: var(--tok-class); }
.doc pre .c { color: var(--faint); }
.doc pre .b { color: var(--tok-escape); }

.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  opacity: 0;
  transition: opacity 0.15s;
}

.doc pre:hover .copy-btn,
.copy-btn:focus-visible {
  opacity: 1;
}

.table-wrap {
  margin: 0 0 18px;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 10px;
}

.doc table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  line-height: 1.5;
}

.doc th,
.doc td {
  padding: 9px 12px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

.doc th {
  background: var(--surface-2);
  font-size: 13px;
  font-weight: 600;
}

.doc tr:last-child td {
  border-bottom: 0;
}

.doc table.num td:nth-child(n + 2) {
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.doc table.syntax td:first-child {
  white-space: nowrap;
}

.callout {
  margin: 0 0 18px;
  padding: 12px 16px;
  border-left: 3px solid var(--accent);
  border-radius: 0 10px 10px 0;
  background: var(--accent-soft);
  font-size: 14.5px;
}

.steps {
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.steps li {
  position: relative;
  margin: 0 0 12px;
  padding-left: 40px;
  counter-increment: step;
}

.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 1px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent);
  color: #1d1406;
  font: 700 13px/26px var(--sans);
  text-align: center;
}

.pipeline {
  display: grid;
  gap: 8px;
  padding: 0;
  list-style: none;
  counter-reset: stage;
}

.pipeline li {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  gap: 14px;
  margin: 0;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  counter-increment: stage;
}

.pipeline li b::before {
  content: counter(stage) ". ";
  color: var(--accent-ink);
}

.pipeline li span {
  color: var(--muted);
  font-size: 14.5px;
}

.try {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 3px 12px;
  border: 1px solid color-mix(in srgb, var(--accent) 50%, transparent);
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-ink) !important;
  font-size: 13.5px;
  font-weight: 600;
  text-decoration: none;
}

.try::before {
  content: "";
  border-left: 7px solid currentColor;
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
}

.try:hover {
  border-color: var(--accent);
}

.next {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 44px 0 12px;
}

.next-card {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  color: var(--text) !important;
  text-decoration: none;
}

.next-card:hover {
  border-color: var(--accent);
}

.next-card span {
  font-size: 12px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--faint);
}

.next-card b {
  font-size: 16px;
}

.next-card small {
  font-size: 13.5px;
  color: var(--muted);
}

.toc {
  position: sticky;
  top: 84px;
  font-size: 13.5px;
}

.toc h2 {
  margin: 4px 0 8px;
  font-size: 12px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
}

.toc ol {
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--border);
}

.toc a {
  display: block;
  margin-left: -1px;
  padding: 4px 0 4px 12px;
  border-left: 2px solid transparent;
  color: var(--muted);
  text-decoration: none;
}

.toc a:hover {
  color: var(--text);
  border-left-color: var(--accent);
}

@media (max-width: 960px) {
  .doc-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .toc {
    display: none;
  }
}

@media (max-width: 760px) {
  .brand-sub,
  .topbar .chip {
    display: none;
  }

  .nav {
    margin-left: 6px;
  }

  .nav a {
    padding: 6px 8px;
    font-size: 13.5px;
  }
}

@media (max-width: 640px) {
  .doc-page {
    padding: 14px 16px 4px;
  }

  .doc {
    font-size: 15px;
  }

  .doc h1 {
    font-size: 27px;
  }

  .doc .lede {
    font-size: 16px;
  }

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

  .pipeline li {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .about > div {
    padding: 16px;
  }
}

@media (max-width: 420px) {
  .brand-text {
    display: none;
  }

  .logo {
    width: 34px;
    height: 34px;
  }
}

/* --- responsive ------------------------------------------------------------------------------ */

@media (max-width: 1100px) {
  .layout,
  .about {
    grid-template-columns: minmax(0, 1fr);
  }

  .col-side {
    position: static;
    max-height: none;
    overflow: visible;
  }
}

@media (max-width: 640px) {
  .topbar {
    padding: 8px 16px;
  }

  .topbar .link {
    display: none;
  }

  .page {
    padding: 0 16px;
  }

  .hero h1 {
    font-size: 21px;
  }

  .layout {
    gap: 16px;
  }

  .card {
    padding: 12px 12px 14px;
  }

  .tabs {
    margin: 0 -12px 12px;
    padding: 0 6px;
  }

  .foot {
    padding: 0 16px 24px;
  }

  .delim {
    display: none;
  }

  .flag-text {
    display: none;
  }

  .subject-editor {
    height: 220px;
  }

  .ref-item {
    grid-template-columns: 84px minmax(0, 1fr);
  }
}