/*
 * styles.css — one hand-written stylesheet, no framework.
 *
 * Light and dark are driven by prefers-color-scheme, so the site needs no
 * script to respect the reader's setting. Code panels stay dark in both,
 * because the token colours are part of how the examples read.
 */

:root {
  --ink: #0f172a;
  --sky: #38bdf8;
  --sky-deep: #0284c7;

  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --bg-sunk: #f1f5f9;
  --fg: #0f172a;
  --fg-muted: #475569;
  --fg-faint: #64748b;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --link: #0369a1;
  --ok: #047857;
  --bad: #b91c1c;

  --code-bg: #0f172a;
  --code-fg: #e2e8f0;
  --code-border: #1e293b;
  --code-head: #94a3b8;

  --t-op: #f0abfc;
  --t-key: #7dd3fc;
  --t-str: #a7f3d0;
  --t-num: #fde68a;
  --t-lit: #fca5a5;
  --t-com: #64748b;
  --t-brace: #94a3b8;

  --radius: 12px;
  --wrap: 1180px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1120;
    --bg-alt: #0f172a;
    --bg-sunk: #131c31;
    --fg: #e2e8f0;
    --fg-muted: #94a3b8;
    --fg-faint: #7c8aa0;
    --border: #1e293b;
    --border-strong: #334155;
    --link: #7dd3fc;
    --ok: #34d399;
    --bad: #fca5a5;
    --code-bg: #0a1020;
    --code-border: #1b2740;
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 400 17px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: 24px;
}

.wrap.narrow {
  max-width: 820px;
}

a {
  color: var(--link);
  text-decoration-color: color-mix(in srgb, var(--link) 40%, transparent);
  text-underline-offset: 2px;
}

a:hover {
  text-decoration-color: currentColor;
}

code {
  font-family: var(--mono);
  font-size: 0.89em;
  background: var(--bg-sunk);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 0.1em 0.34em;
  overflow-wrap: break-word;
}

h1,
h2,
h3,
h4 {
  line-height: 1.22;
  letter-spacing: -0.018em;
  margin: 0 0 0.5em;
  font-weight: 650;
}

h1 {
  font-size: clamp(2rem, 1.4rem + 2.2vw, 2.9rem);
}
h2 {
  font-size: clamp(1.35rem, 1.1rem + 1vw, 1.75rem);
}
h3 {
  font-size: 1.16rem;
}

p {
  margin: 0 0 1em;
}

.muted {
  color: var(--fg-muted);
}
.small {
  font-size: 0.9rem;
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: #fff;
  padding: 0.7rem 1rem;
  z-index: 100;
}
.skip:focus {
  left: 0;
}

:focus-visible {
  outline: 2px solid var(--sky);
  outline-offset: 2px;
  border-radius: 3px;
}

/* ---------- header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  height: 60px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 600;
  font-size: 1.02rem;
  color: var(--fg);
  text-decoration: none;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.brand strong {
  font-weight: 750;
}

.site-header nav {
  display: flex;
  gap: 1.35rem;
  margin-left: auto;
  font-size: 0.95rem;
  overflow-x: auto;
  scrollbar-width: none;
}
.site-header nav::-webkit-scrollbar {
  display: none;
}

.site-header nav a {
  color: var(--fg-muted);
  text-decoration: none;
  white-space: nowrap;
  padding: 0.2rem 0;
  border-bottom: 2px solid transparent;
}

.site-header nav a:hover {
  color: var(--fg);
}

.site-header nav a[aria-current="page"] {
  color: var(--fg);
  border-bottom-color: var(--sky);
}

.gh {
  font-size: 0.9rem;
  font-weight: 550;
  padding: 0.34rem 0.8rem;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  color: var(--fg);
  text-decoration: none;
  white-space: nowrap;
}
.gh:hover {
  border-color: var(--fg-muted);
}

@media (max-width: 900px) {
  .gh {
    display: none;
  }
}

/* ---------- hero ---------- */

.hero {
  background:
    radial-gradient(900px 420px at 88% -8%, rgba(56, 189, 248, 0.18), transparent 65%),
    radial-gradient(700px 380px at 6% 4%, rgba(147, 51, 234, 0.11), transparent 60%),
    var(--ink);
  color: #e8eefc;
  border-bottom: 1px solid var(--code-border);
  padding: clamp(2.6rem, 5vw, 4.6rem) 0 clamp(2.4rem, 4vw, 3.6rem);
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(1.6rem, 4vw, 3.4rem);
  align-items: center;
}

.hero-logo {
  margin-bottom: 1.1rem;
  filter: drop-shadow(0 8px 24px rgba(0, 0, 0, 0.4));
}

.hero h1 {
  font-size: clamp(2.1rem, 1.2rem + 3vw, 3.3rem);
  letter-spacing: -0.03em;
  margin-bottom: 0.7rem;
  color: #fff;
}

.hero .lede {
  font-size: clamp(1.02rem, 0.95rem + 0.35vw, 1.16rem);
  color: #b9c7e4;
  max-width: 46ch;
  margin-bottom: 1.5rem;
}

.hero .lede strong {
  color: #fff;
  font-weight: 600;
}

.hero code {
  background: rgba(148, 163, 184, 0.16);
  border-color: rgba(148, 163, 184, 0.24);
  color: #d9e4fb;
}

.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-bottom: 1.6rem;
}

.btn {
  display: inline-block;
  padding: 0.62rem 1.15rem;
  border-radius: 9px;
  font-weight: 580;
  font-size: 0.97rem;
  text-decoration: none;
  border: 1px solid rgba(148, 163, 184, 0.35);
  color: #e8eefc;
  transition: transform 0.12s ease, background 0.12s ease;
}

.btn:hover {
  transform: translateY(-1px);
  background: rgba(148, 163, 184, 0.14);
}

.btn.primary {
  background: var(--sky);
  border-color: var(--sky);
  color: #06263c;
  font-weight: 650;
}

.btn.primary:hover {
  background: #7dd3fc;
}

.btn.ghost {
  border-color: transparent;
  color: #a9bbdc;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.1rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.86rem;
  color: #8fa3c6;
}

.badges li {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.badges li::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--sky);
  opacity: 0.8;
}

.badges code {
  font-size: 0.82rem;
}

@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }
  .hero .lede {
    max-width: none;
  }
}

/* ---------- bands ---------- */

.band {
  padding: clamp(2.6rem, 5vw, 4.4rem) 0;
  border-bottom: 1px solid var(--border);
}

.band.alt {
  background: var(--bg-alt);
}

.section-title {
  font-size: clamp(1.5rem, 1.2rem + 1.2vw, 2.05rem);
  letter-spacing: -0.025em;
  margin-bottom: 0.6rem;
}

.section-lede {
  color: var(--fg-muted);
  max-width: 72ch;
  font-size: 1.04rem;
  margin-bottom: 2.2rem;
}

.cards {
  display: grid;
  gap: 1.1rem;
  margin-bottom: 1.1rem;
}

.cards.three {
  grid-template-columns: repeat(auto-fit, minmax(285px, 1fr));
}

.cards.two {
  grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
}

.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem 1.5rem;
}

.card h3 {
  font-size: 1.06rem;
  letter-spacing: -0.012em;
}

.card p {
  color: var(--fg-muted);
  font-size: 0.97rem;
  margin-bottom: 0;
}

.card p + p {
  margin-top: 0.8rem;
}

.card.code-card .code {
  margin-top: 1.1rem;
  margin-bottom: 0;
}

.card.link-card h3 a {
  text-decoration: none;
}

.card.link-card h3 a::after {
  content: " →";
  color: var(--fg-faint);
  font-weight: 400;
}

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

/* ---------- the two rules ---------- */

.rule {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(1.4rem, 3vw, 3rem);
  align-items: start;
  padding: 1.8rem 0;
  border-top: 1px solid var(--border);
}

.rule-copy p {
  color: var(--fg-muted);
}

.rule h3 {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  font-size: 1.22rem;
}

.rule .num {
  flex: none;
  width: 1.7rem;
  height: 1.7rem;
  border-radius: 50%;
  background: var(--sky);
  color: #06263c;
  font-size: 0.92rem;
  font-weight: 700;
  display: grid;
  place-items: center;
}

.rule-code .code + .code {
  margin-top: 0.8rem;
}

table.truth {
  border-collapse: collapse;
  font-size: 0.93rem;
  margin-top: 1.2rem;
  width: 100%;
}

table.truth caption {
  text-align: left;
  color: var(--fg-faint);
  font-size: 0.85rem;
  padding-bottom: 0.4rem;
}

table.truth th,
table.truth td {
  text-align: left;
  padding: 0.45rem 0.8rem 0.45rem 0;
  border-bottom: 1px solid var(--border);
}

table.truth .yes {
  color: var(--ok);
  font-weight: 600;
}
table.truth .no {
  color: var(--bad);
  font-weight: 600;
}

@media (max-width: 900px) {
  .rule {
    grid-template-columns: 1fr;
  }
}

.status-band {
  background: var(--bg-alt);
  border-bottom: none;
}

.status-band p {
  color: var(--fg-muted);
}

/* ---------- code blocks ---------- */

figure.code {
  position: relative;
  margin: 1.3rem 0;
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.code-label {
  padding: 0.62rem 1rem;
  font-size: 0.79rem;
  color: var(--code-head);
  border-bottom: 1px solid var(--code-border);
  font-family: var(--mono);
  letter-spacing: 0.01em;
}

figure.code pre {
  margin: 0;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.845rem;
  line-height: 1.62;
  color: var(--code-fg);
  tab-size: 2;
}

figure.code code {
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
  color: inherit;
}

button.copy {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  font: 550 0.74rem var(--sans);
  color: var(--code-head);
  background: rgba(148, 163, 184, 0.13);
  border: 1px solid rgba(148, 163, 184, 0.22);
  border-radius: 6px;
  padding: 0.24rem 0.55rem;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.14s ease;
}

figure.code:hover button.copy,
button.copy:focus-visible {
  opacity: 1;
}

button.copy:hover {
  color: #fff;
}

button.copy.done {
  opacity: 1;
  color: var(--t-str);
}

.code-label + pre {
  padding-top: 0.9rem;
}

.t-op {
  color: var(--t-op);
}
.t-key {
  color: var(--t-key);
}
.t-str {
  color: var(--t-str);
}
.t-num {
  color: var(--t-num);
}
.t-lit {
  color: var(--t-lit);
}
.t-com {
  color: var(--t-com);
  font-style: italic;
}
.t-brace {
  color: var(--t-brace);
}

/* ---------- documents ---------- */

.doc {
  padding: 2.4rem 0 4rem;
}

.doc-layout {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: start;
}

.crumbs {
  font-size: 0.87rem;
  color: var(--fg-faint);
  margin-bottom: 1.1rem;
}

.crumbs a {
  color: var(--fg-muted);
}

.eyebrow {
  font-size: 0.76rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  font-weight: 650;
  color: var(--sky-deep);
  margin-bottom: 0.5rem;
}

@media (prefers-color-scheme: dark) {
  .eyebrow {
    color: var(--sky);
  }
}

.doc .lede {
  font-size: 1.1rem;
  color: var(--fg-muted);
  max-width: 70ch;
}

.doc h2 {
  margin-top: 2.4rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--border);
}

.doc h3 {
  margin-top: 1.9rem;
}

.doc p,
.doc li {
  max-width: 78ch;
}

.doc ul,
.doc ol {
  padding-left: 1.3rem;
}

.doc li {
  margin-bottom: 0.4rem;
}

.doc ul.plain {
  list-style: none;
  padding-left: 0;
}

.doc ul.plain li {
  padding-left: 1.1rem;
  position: relative;
}

.doc ul.plain li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--fg-faint);
}

.doc blockquote {
  margin: 1.4rem 0;
  padding: 0.2rem 0 0.2rem 1.2rem;
  border-left: 3px solid var(--sky);
  color: var(--fg-muted);
}

.doc hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.4rem 0;
}

.anchor {
  margin-left: 0.45rem;
  color: var(--border-strong);
  text-decoration: none;
  font-weight: 400;
  opacity: 0;
  font-size: 0.85em;
}

h1:hover .anchor,
h2:hover .anchor,
h3:hover .anchor,
h4:hover .anchor,
.anchor:focus-visible {
  opacity: 1;
}

.note {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-left: 3px solid var(--sky);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 0.95rem 1.2rem;
  color: var(--fg-muted);
  font-size: 0.96rem;
  max-width: 78ch;
}

.note p:last-child {
  margin-bottom: 0;
}

.callout {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.3rem 1.5rem;
  margin: 2rem 0;
}

.callout.subtle {
  background: none;
}

.callout h2 {
  margin: 0 0 0.6rem;
  font-size: 1.05rem;
  border: none;
  padding: 0;
}

.callout p {
  color: var(--fg-muted);
  font-size: 0.97rem;
}

.callout p:last-child {
  margin-bottom: 0;
}

.center-block {
  text-align: center;
  padding: 3rem 0 5rem;
}

.center-block .lede {
  margin-inline: auto;
}

/* ---------- tables ---------- */

.table-scroll {
  overflow-x: auto;
  margin: 1.4rem 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.table-scroll table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.95rem;
  min-width: 460px;
}

.table-scroll th {
  text-align: left;
  font-weight: 620;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--fg-faint);
  background: var(--bg-alt);
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.table-scroll td {
  padding: 0.72rem 1rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

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

.table-scroll td p {
  margin: 0;
  max-width: 68ch;
}

.table-scroll td p + p {
  margin-top: 0.5rem;
}

/* ---------- table of contents ---------- */

.toc {
  position: sticky;
  top: 78px;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
  font-size: 0.9rem;
  padding-right: 0.5rem;
}

.toc h2 {
  font-size: 0.76rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin: 0 0 0.7rem;
  border: none;
  padding: 0;
}

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

.toc li {
  margin: 0;
}

.toc a {
  display: block;
  padding: 0.25rem 0 0.25rem 0.85rem;
  margin-left: -1px;
  border-left: 2px solid transparent;
  color: var(--fg-muted);
  text-decoration: none;
  line-height: 1.4;
}

.toc a:hover {
  color: var(--fg);
}

.toc li.lvl-3 a {
  padding-left: 1.6rem;
  font-size: 0.86rem;
}

.toc a.on {
  color: var(--link);
  border-left-color: var(--sky);
  font-weight: 550;
}

@media (max-width: 1000px) {
  .doc-layout {
    grid-template-columns: 1fr;
  }
  .toc {
    position: static;
    max-height: none;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem 1.1rem;
    background: var(--bg-alt);
  }
}

/* ---------- operator reference ---------- */

.profile {
  margin-top: 2.6rem;
}

.profile h3 {
  font-size: 1.3rem;
  margin-bottom: 0.35rem;
}

.profile h3 code {
  background: none;
  border: none;
  padding: 0;
  font-size: 1em;
  color: var(--sky-deep);
}

@media (prefers-color-scheme: dark) {
  .profile h3 code {
    color: var(--sky);
  }
}

.profile-note {
  color: var(--fg-muted);
  font-size: 0.97rem;
  max-width: 78ch;
}

.profile-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
}

.profile-nav a {
  text-decoration: none;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  padding: 0.2rem 0.7rem;
  font-size: 0.88rem;
}

table.operators td.op-name {
  white-space: nowrap;
}

table.operators td.op-name a {
  text-decoration: none;
}

table.operators td.op-name code {
  font-weight: 600;
  color: var(--t-op);
  background: color-mix(in srgb, var(--t-op) 12%, transparent);
  border-color: color-mix(in srgb, var(--t-op) 28%, transparent);
}

@media (prefers-color-scheme: light) {
  table.operators td.op-name code {
    color: #a21caf;
  }
}

table.operators td.op-operand {
  color: var(--fg-muted);
  font-size: 0.9rem;
  min-width: 11rem;
}

.operand {
  border-bottom: 1px dotted var(--border-strong);
  cursor: help;
}

.or {
  color: var(--fg-faint);
  font-style: italic;
  font-size: 0.9em;
}

.scope {
  display: inline-block;
  margin-left: 0.4rem;
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 650;
  color: var(--fg-faint);
  background: var(--bg-sunk);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.06rem 0.32rem;
  vertical-align: 1px;
  cursor: help;
}

:target > td:first-child,
tr:target {
  background: color-mix(in srgb, var(--sky) 9%, transparent);
}

/* ---------- problems ---------- */

dl.facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin: 1.8rem 0 2.4rem;
  padding: 1.1rem 1.3rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

dl.facts dt {
  font-size: 0.75rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--fg-faint);
  font-weight: 650;
  margin-bottom: 0.25rem;
}

dl.facts dd {
  margin: 0;
  font-size: 0.93rem;
  overflow-wrap: anywhere;
}

.problem h1 code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.86em;
}

/* ---------- playground ---------- */

.presets {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 1.6rem 0 1rem;
}

.presets button {
  font: 550 0.86rem var(--sans);
  color: var(--fg-muted);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.3rem 0.8rem;
  cursor: pointer;
}

.presets button:hover {
  border-color: var(--border-strong);
  color: var(--fg);
}

.presets button.on {
  background: var(--ink);
  border-color: var(--ink);
  color: #fff;
}

@media (prefers-color-scheme: dark) {
  .presets button.on {
    background: var(--sky);
    border-color: var(--sky);
    color: #06263c;
  }
}

.pg-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 1.1rem;
  align-items: stretch;
}

.pg-editor,
.pg-result {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-alt);
  min-height: 400px;
}

.pg-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.55rem 0.9rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 650;
  color: var(--fg-faint);
  background: var(--bg);
}

.pg-actions {
  display: flex;
  gap: 0.4rem;
}

.pg-actions button {
  font: 550 0.78rem var(--sans);
  text-transform: none;
  letter-spacing: 0;
  color: var(--fg-muted);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.16rem 0.5rem;
  cursor: pointer;
}

.pg-actions button:hover {
  color: var(--fg);
  border-color: var(--border-strong);
}

#filter-input {
  flex: 1;
  width: 100%;
  border: none;
  resize: vertical;
  padding: 1rem 1.1rem;
  background: var(--code-bg);
  color: var(--code-fg);
  font: 400 0.875rem/1.65 var(--mono);
  tab-size: 2;
  min-height: 340px;
}

#filter-input:focus {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--sky);
}

.status {
  padding: 0.7rem 1.1rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.status::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
  flex: none;
}

.status.ok {
  color: var(--ok);
}
.status.error {
  color: var(--bad);
}
.status.loading,
.status.idle {
  color: var(--fg-faint);
}

.errors {
  padding: 1rem 1.1rem;
  overflow-y: auto;
  flex: 1;
}

.errors .hint {
  color: var(--fg-muted);
  font-size: 0.94rem;
  margin: 0;
}

.err {
  border: 1px solid var(--border);
  border-left: 3px solid var(--bad);
  border-radius: 0 8px 8px 0;
  padding: 0.7rem 0.9rem;
  margin-bottom: 0.7rem;
  background: var(--bg);
}

.err-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.8rem;
  margin-bottom: 0.4rem;
}

.err-head a {
  text-decoration: none;
}

.err-head code {
  font-weight: 600;
}

.err .ptr {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--fg-faint);
  overflow-wrap: anywhere;
}

.err p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--fg-muted);
}

.x {
  color: var(--bad);
  font-weight: 700;
}

@media (max-width: 900px) {
  .pg-grid {
    grid-template-columns: 1fr;
  }
  .pg-editor,
  .pg-result {
    min-height: 0;
  }
}

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

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-alt);
  padding: 2.8rem 0 3.2rem;
  font-size: 0.94rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 2fr) repeat(2, minmax(0, 1fr));
  gap: 2rem;
}

.footer-grid h2 {
  font-size: 0.76rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin-bottom: 0.7rem;
}

.footer-grid ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-grid li {
  margin-bottom: 0.4rem;
}

.footer-grid .brand {
  margin-bottom: 0.8rem;
}

.footer-grid p {
  max-width: 46ch;
}

@media (max-width: 700px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.6rem;
  }
}