:root {
  --bg-0: #0b0710;
  --bg-1: #150e1f;
  --bg-2: #1d1329;
  --surface: #1a1224;
  --surface-2: #241a33;
  --border: #382a4a;
  --border-strong: #4a3960;
  --fg: #f3ecf8;
  --fg-muted: #bcadd0;
  --fg-faint: #8a7aa3;
  --accent: #f4b342;
  --accent-strong: #ffcf6b;
  --accent-ink: #2a1b05;
  --purple: #b79ce0;
  --danger: #ff8787;
  --danger-bg: #3a1e22;
  --focus: #ffcf6b;
  --radius-lg: 18px;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 24px 60px -24px rgba(0, 0, 0, 0.65);
  --max-width: 1220px;
}

:root[data-theme='light'] {
  --bg-0: #faf5ec;
  --bg-1: #f3ebd9;
  --bg-2: #ece0c6;
  --surface: #fffdf8;
  --surface-2: #f6eeda;
  --border: #ddccaa;
  --border-strong: #cbb686;
  --fg: #241a10;
  --fg-muted: #5b4a35;
  --fg-faint: #85735a;
  --accent: #a2670f;
  --accent-strong: #7d500c;
  --accent-ink: #fffaf0;
  --purple: #6d4fa0;
  --danger: #b3261e;
  --danger-bg: #fbe4e1;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(
    ellipse 1200px 700px at 50% -10%,
    var(--bg-2) 0%,
    var(--bg-1) 55%,
    var(--bg-0) 100%
  );
  color: var(--fg);
  font-family:
    system-ui,
    -apple-system,
    'Segoe UI',
    sans-serif;
  transition:
    background 0.25s ease,
    color 0.25s ease;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  * {
    transition-duration: 0.001ms !important;
  }
}

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

.skip-link {
  position: absolute;
  left: 12px;
  top: -60px;
  background: var(--accent);
  color: var(--accent-ink);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  z-index: 1000;
  transition: top 0.15s ease;
}

.skip-link:focus {
  top: 12px;
}

a,
button,
input,
select,
summary {
  font-family: inherit;
}

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
  border-radius: 4px;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--bg-0) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 24px;
}

.wordmark {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--fg);
  text-decoration: none;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.wordmark-dot {
  color: var(--accent);
}

.site-nav {
  display: flex;
  gap: 20px;
  margin-left: auto;
  flex-wrap: wrap;
}

.site-nav a {
  color: var(--fg-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  padding: 6px 2px;
}

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

.theme-toggle {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--fg);
  border-radius: 999px;
  width: 40px;
  height: 40px;
  min-width: 44px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.05rem;
  flex-shrink: 0;
}

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

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

main section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 56px 24px;
}

.section-head {
  margin-bottom: 28px;
}

.section-head h2 {
  font-size: 1.9rem;
  margin: 0 0 6px;
  letter-spacing: -0.01em;
}

.section-head p {
  color: var(--fg-muted);
  margin: 0;
  font-size: 1.02rem;
}

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

.hero {
  padding-top: 56px;
  padding-bottom: 40px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.eyebrow {
  color: var(--accent);
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin: 0 0 14px;
}

.hero h1 {
  font-size: clamp(2.2rem, 4.4vw, 3.4rem);
  line-height: 1.08;
  margin: 0 0 16px;
  max-width: 18ch;
  letter-spacing: -0.02em;
}

.hero-copy {
  color: var(--fg-muted);
  font-size: 1.1rem;
  max-width: 56ch;
  margin: 0 0 28px;
}

.hero-cta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 32px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 24px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.98rem;
  text-decoration: none;
  min-height: 44px;
  border: 1px solid transparent;
  cursor: pointer;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-ink);
}

.btn-primary:hover {
  background: var(--accent-strong);
}

.btn-secondary {
  background: transparent;
  color: var(--fg);
  border-color: var(--border-strong);
}

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

.btn-ghost {
  background: var(--surface);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  min-height: 36px;
}

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

.proof-points {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  list-style: none;
  margin: 0;
  padding: 0;
}

.proof-points li {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 7px 14px;
  font-size: 0.85rem;
  color: var(--fg-muted);
  font-weight: 600;
}

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

.playground-grid {
  display: grid;
  grid-template-columns: minmax(320px, 420px) 1fr;
  gap: 28px;
  align-items: start;
}

.controls-card,
.preview-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.controls-card {
  padding: 24px;
  /* Without this, a grid item's default min-width:auto lets a long single
     line inside a code block's <pre> (e.g. the script tag) push this whole
     column (and with it, the document) wider than the viewport — the
     <pre>'s own overflow-x:auto only helps once the item itself is allowed
     to shrink. */
  min-width: 0;
}

.control-group {
  border: 0;
  padding: 0;
  margin: 0 0 26px;
}

.control-group:last-child {
  margin-bottom: 0;
}

.control-group > legend,
.control-group > summary,
.control-group > h3 {
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin: 0 0 12px;
  padding: 0;
}

.corner-picker {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: repeat(2, 1fr);
  gap: 8px;
  width: 128px;
  height: 128px;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-2);
}

.corner-option {
  position: relative;
  display: block;
  cursor: pointer;
}

.corner-option input {
  position: absolute;
  inset: 0;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.corner-box {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  font-size: 1.15rem;
  filter: grayscale(1) opacity(0.45);
}

.corner-option input:checked + .corner-box {
  background: color-mix(in srgb, var(--accent) 22%, var(--surface));
  border-color: var(--accent);
  box-shadow: inset 0 0 0 1px var(--accent);
  filter: none;
}

.corner-option input:focus-visible + .corner-box {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.toggle-cards {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.toggle-card {
  display: flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  border-radius: var(--radius);
  padding: 10px 14px;
  cursor: pointer;
  flex: 1 1 auto;
  min-height: 44px;
}

.toggle-card input {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  flex-shrink: 0;
}

.toggle-glyph {
  font-size: 1.05rem;
}

.toggle-glyph-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 18px;
  padding: 0 5px;
  border-radius: 4px;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  color: var(--fg-muted);
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.toggle-text {
  font-size: 0.9rem;
  font-weight: 600;
  white-space: nowrap;
}

.toggle-card:has(input:checked) {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 14%, var(--surface-2));
}

.segmented {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface-2);
  padding: 3px;
  gap: 2px;
}

.segmented-option {
  position: relative;
  cursor: pointer;
}

.segmented-option input {
  position: absolute;
  opacity: 0;
  inset: 0;
  margin: 0;
  cursor: pointer;
}

.segmented-option span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 18px;
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--fg-muted);
  min-height: 36px;
}

.segmented-option input:checked + span {
  background: var(--accent);
  color: var(--accent-ink);
}

.segmented-option input:focus-visible + span {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.switch-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  margin-bottom: 12px;
  min-height: 24px;
}

.switch-row input {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
}

.color-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.color-row input[type='color'] {
  width: 40px;
  height: 40px;
  padding: 2px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  cursor: pointer;
}

.color-row input[type='text'] {
  background: var(--surface-2);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 9px 10px;
  font-size: 0.9rem;
  font-family: ui-monospace, monospace;
  width: 110px;
}

.color-row input[type='text']:focus-visible,
.color-row input[type='text']:focus {
  border-color: var(--accent);
}

.color-row input[aria-invalid='true'] {
  border-color: var(--danger);
}

.field-error {
  color: var(--danger);
  font-size: 0.82rem;
  margin: 8px 0 0;
  min-height: 1.2em;
}

.install-group {
  /* A plain <div>, not a <fieldset> — a fieldset's UA-default min-width is
     based on its content's intrinsic (min-content) size and ignores a
     min-width:0 override on an ancestor, which is what let a long single
     code line push the whole document wider than the viewport before. A
     <div> has no such default, so min-width:0 here is enough on its own.
     Sits above .playground-grid as its own full-width card (same surface
     treatment as .controls-card/.preview-card), not nested inside either. */
  min-width: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 28px;
}

.body-output-group {
  /* Same min-width:0 rationale as .install-group above — this is a plain
     <div>, back in its original spot at the bottom of .controls-card. */
  min-width: 0;
}

.live-body-copy {
  color: var(--fg-muted);
  font-size: 0.85rem;
  margin: 0 0 12px;
  line-height: 1.5;
}

.live-body-copy code {
  font-family: ui-monospace, 'SFMono-Regular', Consolas, monospace;
  color: var(--fg);
}

.body-output-block {
  min-width: 0;
}

.body-output {
  display: block;
  width: 100%;
  box-sizing: border-box;
  margin: 0;
  padding: 16px 100px 16px 18px;
  border: 0;
  background: transparent;
  color: var(--fg);
  font-family: ui-monospace, 'SFMono-Regular', Consolas, monospace;
  font-size: 0.85rem;
  line-height: 1.5;
  resize: none;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  overflow-x: hidden;
  overflow-y: hidden;
}

.season-details summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 6px;
}

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

.season-details summary::before {
  content: '';
  flex: 0 0 auto;
  width: 0;
  height: 0;
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  border-left: 6px solid currentColor;
  color: var(--accent);
  transition: transform 0.15s ease;
}

.season-details[open] summary::before {
  transform: rotate(90deg);
}

.season-fields {
  padding-top: 14px;
}

.season-pair {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.season-pair select {
  background: var(--surface-2);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 8px;
  font-size: 0.88rem;
}

.season-to {
  color: var(--fg-faint);
  font-size: 0.85rem;
}

.field-note {
  color: var(--fg-faint);
  font-size: 0.82rem;
  margin: 12px 0 0;
}

/* ---------- preview card ---------- */

.preview-card {
  overflow: hidden;
  position: sticky;
  top: 84px;
}

.preview-toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.preview-label {
  font-weight: 700;
  font-size: 0.9rem;
}

.preview-badge {
  font-size: 0.78rem;
  color: var(--purple);
  background: color-mix(in srgb, var(--purple) 16%, transparent);
  border-radius: 999px;
  padding: 4px 10px;
}

#replay-btn {
  margin-left: auto;
}

#preview-frame {
  display: block;
  width: 100%;
  height: 540px;
  border: 0;
  background: var(--bg-0);
}

/* ---------- install ---------- */

.tabs {
  display: inline-flex;
  border-bottom: 1px solid var(--border);
  margin-bottom: 18px;
  gap: 4px;
}

.tabs [role='tab'] {
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  color: var(--fg-muted);
  padding: 10px 6px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  min-height: 44px;
}

.tabs [role='tab'][aria-selected='true'] {
  color: var(--fg);
  border-bottom-color: var(--accent);
}

[role='tabpanel'][hidden] {
  display: none;
}

.demo-note {
  color: var(--fg-muted);
  font-size: 0.92rem;
  margin: 18px 0 12px;
}

.demo-note:first-of-type {
  margin-top: 0;
}

.code-block {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
}

.code-block pre {
  margin: 0;
  padding: 16px 100px 16px 18px;
  overflow-x: auto;
  font-size: 0.85rem;
  color: var(--fg);
  font-family: ui-monospace, 'SFMono-Regular', Consolas, monospace;
}

.copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  background: var(--surface-2);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 12px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  min-height: 32px;
}

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

.copy-status {
  color: var(--accent);
  font-size: 0.85rem;
  min-height: 1.2em;
  margin: 0;
}

/* ---------- credibility ---------- */

.credibility {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  padding-top: 8px;
  padding-bottom: 8px;
}

.credibility-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.credibility-item h3 {
  margin: 0 0 6px;
  font-size: 1.02rem;
}

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

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

.site-footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 32px 24px 64px;
  color: var(--fg-faint);
  font-size: 0.9rem;
  /* border-top: 1px solid var(--border); */
}

.site-footer p {
  margin: 0 0 8px;
}

.site-footer a {
  color: var(--fg-muted);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--accent);
}

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

@media (max-width: 1024px) {
  .playground-grid {
    grid-template-columns: 1fr;
  }

  .preview-card {
    position: static;
  }

  #preview-frame {
    height: 480px;
  }

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

@media (max-width: 640px) {
  .header-inner {
    padding: 12px 16px;
    gap: 12px;
  }

  .site-nav {
    gap: 14px;
  }

  .site-nav a {
    font-size: 0.88rem;
  }

  main section {
    padding: 40px 16px;
  }

  .hero {
    padding-top: 36px;
  }

  .hero h1 {
    font-size: 1.8rem;
  }

  .controls-card,
  .install-group {
    padding: 18px;
  }

  #preview-frame {
    height: 420px;
  }

  .code-block pre {
    padding-right: 18px;
    padding-bottom: 52px;
  }

  .body-output {
    padding-right: 18px;
    padding-bottom: 52px;
  }

  .copy-btn {
    top: auto;
    bottom: 10px;
    right: 10px;
  }
}

@media (max-width: 520px) {
  /* .site-nav normally carries margin-left: auto, which is what pushes
     both itself and the theme toggle after it to the right edge. Hiding it
     here would otherwise leave the toggle sitting right next to the
     wordmark — .theme-toggle takes over that job so the header stays a
     single row with the wordmark on the left and the toggle on the right,
     at both 390px and 320px. Playground/Install/GitHub are still one
     scroll away, so no hamburger menu is needed. */
  .site-nav {
    display: none;
  }

  .theme-toggle {
    margin-left: auto;
  }
}