/* ============================================================================
   BRAND.CSS — Brutalist portable design pack
   Engineer-builder. Dark only. Single accent. Token-driven.

   Cascade (do not break):
     1. Tokens    :root { ... }  ← canonical
     2. Reset                  ← element defaults
     3. Atoms       A1..A8      ← buttons, inputs, tags, badges, kbd, divider, spinner, code-block
     4. Molecules   M1..M7      ← card, callout, nav-link, toast, tooltip, tabs, segmented-radio
     5. Organisms   O1..O7      ← header, footer, hero, section, form-row, empty-state, loading-state
     6. Whimsy                 ← motion, easter egg, copy affordance
     7. A11y                   ← focus, reduced-motion, forced-colors, print, touch, RTL

   Slot system: --brand-glyph, --brand-accent, --brand-project-override.
   Override ANY token from a single project CSS loaded after this file.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. TOKENS
   -------------------------------------------------------------------------- */

:root {
  /* color.canvas */
  --canvas-base: #0a0a0a;
  --canvas-raised: #141414;
  --canvas-sunken: #050505;

  /* color.border */
  --border-hairline: #1f1f1f;
  --border-strong: #3a3a3a;

  /* color.text */
  --text-primary: #ededed;
  --text-muted: #a1a1a1;
  --text-subtle: #7a7a7a;
  --text-inverse: #0a0a0a;

  /* color.accent — single hue, 14.92:1 on canvas */
  --accent: #c4f000;
  --accent-hover: #c4f000;
  --accent-subtle: #1a1f00;

  /* color.status */
  --status-ok-fg: #7ee787;  --status-ok-bg: #0a1f0a;
  --status-warn-fg: #f0b429; --status-warn-bg: #1f1500;
  --status-err-fg: #ff6b6b;  --status-err-bg: #1f0a0a;
  --status-info-fg: #79b8ff; --status-info-bg: #0a1428;

  /* font.family */
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* font.weight */
  --weight-regular: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;

  /* font.size */
  --text-xs: 12px;
  --text-sm: 14px;
  --text-base: 16px;
  --text-md: 18px;
  --text-lg: 24px;
  --text-xl: 32px;
  --text-2xl: 48px;
  --text-3xl: 64px;
  --text-display: clamp(16px, 14cqw, 128px);

  /* font.leading */
  --leading-none: 1;
  --leading-tight: 1.2;
  --leading-snug: 1.4;
  --leading-normal: 1.5;
  --leading-relaxed: 1.7;
  --leading-mono: 1.6;

  /* font.tracking */
  --tracking-tight: -0.02em;
  --tracking-normal: 0;
  --tracking-wide: 0.04em;
  --tracking-caps: 0.125em;

  /* numeric */
  --numeric-tabular: tabular-nums;

  /* space (4px base) */
  --space-0: 0;
  --space--1: 2px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;

  /* radius */
  --radius-none: 0;
  --radius-input: 2px;
  --radius-pill: 9999px;

  /* shadow — offset, never blurred, never inset */
  --shadow-hairline: 0 0 0 1px #1f1f1f;
  --shadow-hard: 4px 4px 0 #c4f000;
  --shadow-hard-hover: 8px 8px 0 #c4f000;
  --shadow-pressed: 2px 2px 0 #c4f000;

  /* motion */
  --motion-fast: 80ms;
  --motion-base: 150ms;
  --motion-slow: 240ms;
  --motion-easing: cubic-bezier(0.2, 0, 0, 1);
  --motion-easing-snap: linear;

  /* z-index */
  --z-base: 0;
  --z-raised: 10;
  --z-nav: 100;
  --z-modal: 1000;
  --z-toast: 10000;

  /* brand slots */
  --brand-glyph: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='1.5' stroke-linecap='square' stroke-linejoin='miter'><rect x='3' y='3' width='18' height='18' rx='1'/><path d='M3 17 L17 3'/></svg>");
  --brand-accent: #c4f000;
  --brand-mark-size: 24px;
  --brand-mark-size-sm: 16px;
}

/* --------------------------------------------------------------------------
   2. RESET / BASE
   -------------------------------------------------------------------------- */

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

html {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  background-color: var(--canvas-base);
  color: var(--text-primary);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "ss01", "cv11";
}

body {
  margin: 0;
  min-block-size: 100vh;
  background-color: var(--canvas-base);
  color: var(--text-primary);
}

a {
  color: var(--text-primary);
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color var(--motion-base) var(--motion-easing-snap);
}

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

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
}

h1 { font-size: var(--text-2xl); font-weight: var(--weight-bold); }
h2 { font-size: var(--text-xl); }
h3 { font-size: var(--text-lg); line-height: var(--leading-snug); }
h4 { font-size: var(--text-md); }

p { margin: 0; line-height: var(--leading-relaxed); }

code, pre, kbd, samp {
  font-family: var(--font-mono);
  font-size: 0.95em;
}

img, svg { display: inline-block; max-inline-size: 100%; }

button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; padding: 0; cursor: pointer; }

::selection {
  background-color: var(--accent);
  color: var(--text-inverse);
}

/* --------------------------------------------------------------------------
   3. ATOMS

   A1. Button
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding-inline: var(--space-2);
  padding-block: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  text-decoration: none;
  color: var(--text-primary);
  background-color: var(--canvas-raised);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-none);
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  transition: color var(--motion-base) var(--motion-easing-snap),
              background-color var(--motion-base) var(--motion-easing-snap),
              border-color var(--motion-base) var(--motion-easing-snap),
              box-shadow var(--motion-fast) var(--motion-easing),
              transform var(--motion-fast) var(--motion-easing);
}

.btn:hover {
  color: var(--text-inverse);
  background-color: var(--accent);
  border-color: var(--accent);
  box-shadow: var(--shadow-hard);
  transform: translate(-4px, -4px);
}

.btn:active {
  box-shadow: var(--shadow-pressed);
  transform: translate(-2px, -2px);
}

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

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.btn--primary {
  color: var(--text-inverse);
  background-color: var(--accent);
  border-color: var(--accent);
  box-shadow: var(--shadow-hard);
}

.btn--primary:hover {
  color: var(--text-inverse);
  background-color: var(--accent);
  border-color: var(--accent);
  box-shadow: var(--shadow-hard-hover);
  transform: translate(-8px, -8px);
}

.btn--ghost {
  color: var(--text-primary);
  background-color: transparent;
  border-color: var(--border-hairline);
  box-shadow: none;
}

.btn--ghost:hover {
  color: var(--text-inverse);
  background-color: var(--accent);
  border-color: var(--accent);
  box-shadow: var(--shadow-hard);
}

.btn--icon {
  padding-inline: var(--space-2);
  padding-block: var(--space-2);
  inline-size: 36px;
  block-size: 36px;
}

/* A2. Input */

.field {
  display: block;
  inline-size: 100%;
  padding-block: var(--space-3);
  padding-inline: var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--text-primary);
  background-color: var(--canvas-sunken);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-input);
  transition: border-color var(--motion-base) var(--motion-easing-snap),
              background-color var(--motion-base) var(--motion-easing-snap);
}

.field::placeholder {
  color: var(--text-subtle);
  font-family: var(--font-mono);
}

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

.field:focus {
  outline: none;
  border-color: var(--accent);
  background-color: var(--canvas-base);
}

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

.field:disabled { opacity: 0.5; cursor: not-allowed; }

.field[aria-invalid="true"] { border-color: var(--status-err-fg); }

textarea.field {
  resize: vertical;
  min-block-size: 96px;
  font-family: var(--font-mono);
  line-height: var(--leading-mono);
}

.field--number {
  font-variant-numeric: tabular-nums;
  text-align: end;
}

.field--search { appearance: none; }

select.field {
  appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23a1a1a1' stroke-width='1.5' stroke-linecap='square'><path d='M6 9 L12 15 L18 9'/></svg>");
  background-repeat: no-repeat;
  background-position: right var(--space-3) center;
  background-size: 16px;
  padding-inline-end: var(--space-8);
}

/* A3. Tag / Pill */

.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding-inline: var(--space-2);
  padding-block: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--text-muted);
  background-color: var(--canvas-raised);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-pill);
  white-space: nowrap;
  user-select: none;
}

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

.tag--solid {
  color: var(--text-inverse);
  background-color: var(--accent);
  border-color: var(--accent);
}

/* A4. Badge */

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-inline-size: 18px;
  padding-inline: var(--space-1);
  padding-block: 2px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-normal);
  font-variant-numeric: tabular-nums;
  color: var(--text-primary);
  background-color: var(--canvas-raised);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-pill);
  line-height: 1;
}

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

/* A5. Kbd */

.kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-inline-size: 22px;
  padding-inline: var(--space-1);
  padding-block: 2px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  color: var(--text-primary);
  background-color: var(--canvas-base);
  border: 1px solid var(--border-strong);
  border-block-end-width: 2px;
  border-radius: var(--radius-input);
  white-space: nowrap;
  user-select: none;
}

/* A6. Divider */

.divider {
  display: block;
  inline-size: 100%;
  block-size: 0;
  margin: 0;
  border: 0;
  border-block-start: 1px solid var(--border-hairline);
}

.divider--strong { border-block-start-color: var(--border-strong); }

.divider--vertical {
  display: inline-block;
  inline-size: 0;
  block-size: 1em;
  border: 0;
  border-inline-start: 1px solid var(--border-hairline);
  vertical-align: middle;
}

/* A7. Spinner */

.spinner {
  display: inline-block;
  inline-size: 16px;
  block-size: 16px;
  border: 2px solid var(--border-strong);
  border-block-start-color: var(--accent);
  animation: spinner-rotate 1s linear infinite;
}

@keyframes spinner-rotate {
  to { transform: rotate(360deg); }
}

/* A8. Code-block */

code {
  font-family: var(--font-mono);
  font-size: 0.95em;
  color: var(--accent);
  background-color: var(--canvas-sunken);
  padding-inline: var(--space-1);
  padding-block: 2px;
  border-radius: var(--radius-input);
}

pre {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: var(--leading-mono);
  color: var(--text-primary);
  background-color: var(--canvas-sunken);
  padding: var(--space-4);
  border: 1px solid var(--border-hairline);
  border-radius: 4px;
  overflow-x: auto;
  font-variant-numeric: tabular-nums;
}

pre code {
  color: inherit;
  background: transparent;
  padding: 0;
  border-radius: 0;
}

/* --------------------------------------------------------------------------
   4. MOLECULES
   -------------------------------------------------------------------------- */

/* M1. Card */

.card {
  display: block;
  padding: var(--space-4);
  background-color: var(--canvas-raised);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-none);
  text-decoration: none;
  color: inherit;
}

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

.card--interactive {
  cursor: pointer;
  transition: border-color var(--motion-base) var(--motion-easing-snap),
              box-shadow var(--motion-fast) var(--motion-easing),
              transform var(--motion-fast) var(--motion-easing);
}

.card--interactive:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-hard);
  transform: translate(-4px, -4px);
}

.card--interactive:active {
  box-shadow: var(--shadow-pressed);
  transform: translate(-2px, -2px);
}

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

.card__title {
  margin-block-end: var(--space-2);
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-snug);
}

.card__meta {
  margin-block-end: var(--space-3);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

.card__body {
  color: var(--text-muted);
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
}

/* M2. Callout */

.callout {
  display: block;
  padding: var(--space-3) var(--space-4);
  background-color: var(--canvas-raised);
  border: 1px solid var(--border-hairline);
  border-inline-start: 4px solid var(--border-hairline);
  border-radius: var(--radius-none);
  color: var(--text-primary);
}

.callout--ok    { background-color: var(--status-ok-bg);    border-inline-start-color: var(--status-ok-fg);    color: var(--status-ok-fg); }
.callout--warn  { background-color: var(--status-warn-bg);  border-inline-start-color: var(--status-warn-fg);  color: var(--status-warn-fg); }
.callout--err   { background-color: var(--status-err-bg);   border-inline-start-color: var(--status-err-fg);   color: var(--status-err-fg); }
.callout--info  { background-color: var(--status-info-bg);  border-inline-start-color: var(--status-info-fg);  color: var(--status-info-fg); }

.callout__title {
  margin-block-end: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
}

/* M3. Nav-link */

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding-inline: var(--space-2);
  padding-block: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--text-muted);
  text-decoration: none;
  border-block-end: 1px solid transparent;
  transition: color var(--motion-base) var(--motion-easing-snap),
              border-color var(--motion-base) var(--motion-easing-snap);
}

.nav-link:hover {
  color: var(--text-primary);
  border-block-end-color: var(--accent);
}

.nav-link--active {
  color: var(--accent);
  border-block-end-color: var(--accent);
}

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

/* M4. Toast */

.toast {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding-inline: var(--space-3);
  padding-block: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--text-primary);
  background-color: var(--canvas-raised);
  border: 1px solid var(--accent);
  border-radius: var(--radius-none);
  position: fixed;
  inset-block-end: var(--space-4);
  inset-inline-end: var(--space-4);
  z-index: var(--z-toast);
  box-shadow: var(--shadow-hard);
  animation: toast-enter var(--motion-slow) var(--motion-easing);
}

@keyframes toast-enter {
  from { transform: translateY(8px); opacity: 0; }
  to   { transform: translateY(0); opacity: 1; }
}

/* M5. Tooltip */

.tooltip {
  display: inline-block;
  position: relative;
}

.tooltip__bubble {
  position: absolute;
  inset-block-end: calc(100% + var(--space-2));
  inset-inline-start: 50%;
  transform: translateX(-50%);
  padding-inline: var(--space-2);
  padding-block: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-primary);
  background-color: var(--canvas-raised);
  border: 1px solid var(--border-strong);
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--motion-base) var(--motion-easing-snap);
}

.tooltip:hover .tooltip__bubble,
.tooltip:focus-within .tooltip__bubble {
  opacity: 1;
}

/* M6. Tabs */

.tabs {
  display: flex;
  gap: 0;
  border-block-end: 1px solid var(--border-hairline);
}

.tab {
  padding-inline: var(--space-3);
  padding-block: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--text-muted);
  background-color: transparent;
  border: 0;
  border-block-end: 2px solid transparent;
  cursor: pointer;
  transition: color var(--motion-base) var(--motion-easing-snap),
              border-color var(--motion-base) var(--motion-easing-snap);
}

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

.tab[aria-selected="true"] {
  color: var(--accent);
  border-block-end-color: var(--accent);
}

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

/* M7. Segmented-radio */

.segmented {
  display: inline-flex;
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-none);
  overflow: hidden;
}

.segmented__option {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding-inline: var(--space-3);
  padding-block: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--text-muted);
  background-color: transparent;
  border: 0;
  border-inline-end: 1px solid var(--border-hairline);
  cursor: pointer;
  transition: color var(--motion-base) var(--motion-easing-snap),
              background-color var(--motion-base) var(--motion-easing-snap);
}

.segmented__option:last-child { border-inline-end: 0; }

.segmented__option input {
  position: absolute;
  inset: 0;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.segmented__option:has(input:checked) {
  color: var(--text-inverse);
  background-color: var(--accent);
}

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

.segmented__option:has(input:checked):hover {
  color: var(--text-inverse);
  background-color: var(--accent);
}

/* --------------------------------------------------------------------------
   5. ORGANISMS
   -------------------------------------------------------------------------- */

/* O1. Header */

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: var(--space-3);
  padding-inline: var(--space-4);
  background-color: var(--canvas-base);
  border-block-end: 1px solid var(--border-hairline);
  position: sticky;
  inset-block-start: 0;
  z-index: var(--z-nav);
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--text-primary);
  text-decoration: none;
}

.site-header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

@media (max-width: 1023px) {
  .site-header__nav { gap: 0; }
  .site-header__nav .nav-link { padding-inline: var(--space-1); }
}

/* O2. Footer */

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: var(--space-4);
  padding-inline: var(--space-4);
  background-color: var(--canvas-base);
  border-block-start: 1px solid var(--border-hairline);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

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

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

/* O3. Hero */

.hero {
  display: block;
  padding-block: var(--space-16);
  padding-inline: var(--space-4);
  container-type: inline-size;
}

.hero__greeting {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-display);
  font-weight: var(--weight-bold);
  line-height: var(--leading-none);
  letter-spacing: var(--tracking-tight);
  color: var(--text-primary);
}

.hero__greeting::after {
  content: "_";
  display: inline-block;
  margin-inline-start: 0.1em;
  color: var(--accent);
  animation: caret-blink 1.2s step-end infinite;
}

@keyframes caret-blink {
  50% { opacity: 0; }
}

.hero__lede {
  margin-block-start: var(--space-6);
  max-inline-size: 56ch;
  font-family: var(--font-sans);
  font-size: var(--text-md);
  line-height: var(--leading-relaxed);
  color: var(--text-muted);
}

/* O4. Section */

.section {
  display: block;
  padding-block: var(--space-12);
  padding-inline: var(--space-4);
  max-inline-size: 1280px;
  margin-inline: auto;
}

.section--bordered {
  border-block-start: 1px solid var(--border-hairline);
}

.section__head {
  display: flex;
  align-items: baseline;
  gap: var(--space-4);
  margin-block-end: var(--space-8);
}

.section__num {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-caps);
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.section__title {
  margin: 0;
  font-size: var(--text-xl);
  font-weight: var(--weight-semibold);
  text-transform: uppercase;
  letter-spacing: var(--tracking-caps);
}

/* O5. Form-row */

.form-row {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-block-end: var(--space-4);
}

.form-row__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--text-muted);
}

.form-row__helper {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--text-subtle);
}

.form-row__error {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--status-err-fg);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

@media (min-width: 640px) {
  .form-row--inline {
    flex-direction: row;
    align-items: center;
    gap: var(--space-4);
  }
  .form-row--inline .form-row__label { flex: 0 0 200px; }
  .form-row--inline .form-row__field { flex: 1 1 auto; }
}

/* O6. Empty-state */

.empty {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-3);
  padding-block: var(--space-10);
  padding-inline: var(--space-4);
  font-family: var(--font-mono);
  color: var(--text-muted);
  border: 1px dashed var(--border-hairline);
}

.empty__glyph {
  display: inline-block;
  font-size: var(--text-lg);
  color: var(--accent);
}

.empty__msg {
  margin: 0;
  font-size: var(--text-sm);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

.empty__cta { margin-block-start: var(--space-2); }

/* O7. Loading-state */

.skeleton {
  display: block;
  background-color: var(--canvas-raised);
  animation: skeleton-pulse 1.5s ease-in-out infinite;
}

@keyframes skeleton-pulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.4; }
}

/* --------------------------------------------------------------------------
   6. WHIMSY LAYER

   - All motion honors prefers-reduced-motion (collapsed in §7.3 below).
   - Whimsy is functional or terminal-flavored only. No decoration.
   -------------------------------------------------------------------------- */

/* Section number counter — increments via @property + @view-timeline
   where supported, falls back to static numbering everywhere else. */

@property --section-step {
  syntax: "<integer>";
  initial-value: 0;
  inherits: false;
}

.section__num {
  counter-reset: section-num var(--section-step, 0);
}

.section__num::before {
  content: "00" counter(section-num) " →";
}

@supports (animation-timeline: view()) {
  .section {
    animation: section-step auto ease-in-out;
    animation-timeline: view(block);
    --section-step: 0;
  }
  @keyframes section-step {
    0%   { --section-step: 0; }
    100% { --section-step: 1; }
  }
}

/* Hero greeting typed entry — clip-path reveal over ~1.5s.
   Reduced-motion: instant reveal (collapsed in §7.3). */

@keyframes hero-type {
  from { clip-path: inset(0 100% 0 0); }
  to   { clip-path: inset(0 0 0 0); }
}

.hero__greeting {
  animation: hero-type 1.5s steps(20, end) var(--motion-easing) both;
  animation-delay: 200ms;
}

/* Copy-button glyph swap — driven by data-copied attribute set on click. */

[data-copied] .copy-target,
.copy-target[data-copied] {
  color: var(--accent);
}

[data-copied]::after,
.copy-target[data-copied]::after {
  content: " ✓";
  color: var(--accent);
}

/* --------------------------------------------------------------------------
   7. A11Y MEDIA QUERIES

   - Focus-visible ring (default).
   - Reduced motion (collapse all transitions/animations).
   - Forced colors (system palette).
   - Print (light, ink-saving).
   - Touch targets (44×44 floor below --bp-lg).
   -------------------------------------------------------------------------- */

/* 7.1 Focus-visible — 2px solid accent, 2px offset */

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

/* 7.2 Keyboard focus caret blink — accent ring alternates with transparent */

@keyframes focus-caret {
  50% { outline-color: transparent; }
}

:focus-visible {
  animation: focus-caret 1.2s step-end infinite;
}

/* 7.3 Reduced motion — all transitions/animations collapse */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
    transform: none !important;
  }
  .hero__greeting {
    animation: none;
    clip-path: none;
  }
  .hero__greeting::after {
    animation: none;
  }
}

/* 7.4 Forced colors — system palette, all borders CanvasText, all accents Highlight */

@media (forced-colors: active) {
  :root {
    --canvas-base: Canvas;
    --canvas-raised: Canvas;
    --canvas-sunken: Canvas;
    --text-primary: CanvasText;
    --text-muted: CanvasText;
    --text-subtle: CanvasText;
    --text-inverse: Canvas;
    --border-hairline: CanvasText;
    --border-strong: CanvasText;
    --accent: Highlight;
    --status-ok-fg: Highlight;
    --status-warn-fg: Highlight;
    --status-err-fg: Highlight;
    --status-info-fg: Highlight;
  }
  .btn, .field, .panel, .card, .tag, .badge, .kbd, .callout, .toast, .tooltip__bubble, .tabs, .tab, .segmented, .segmented__option, .spinner, .skeleton, .empty {
    border: 1px solid CanvasText;
  }
  .btn--primary, .tag--solid, .segmented__option:has(input:checked) {
    background-color: Highlight !important;
    color: HighlightText !important;
    border-color: Highlight !important;
  }
  .btn:hover, .btn:focus-visible, .btn:active {
    box-shadow: none !important;
  }
}

/* 7.5 Print — light, ink-saving */

@media print {
  :root {
    --canvas-base: #ffffff;
    --canvas-raised: #ffffff;
    --canvas-sunken: #ffffff;
    --text-primary: #000000;
    --text-muted: #000000;
    --text-subtle: #000000;
    --text-inverse: #ffffff;
    --border-hairline: #000000;
    --border-strong: #000000;
    --accent: #000000;
  }
  *, *::before, *::after {
    box-shadow: none !important;
    text-shadow: none !important;
    background: transparent !important;
  }
  .site-header, .site-footer { display: none !important; }
  a { color: #000000; text-decoration: underline; }
}

/* 7.6 Touch targets — 44×44 floor below --bp-lg */

@media (max-width: 1023px) {
  .btn, .nav-link, .field, [role="button"], .tab, .segmented__option {
    min-block-size: 44px;
  }
}

/* 7.7 RTL — logical properties throughout; verify with dir="rtl" before merge */

[dir="rtl"] .toast {
  inset-inline-end: var(--space-4);
}

/* --------------------------------------------------------------------------
   8. BRAND-MARK SLOT

   <brand-mark size="sm|md|lg"> consumes --brand-glyph and renders the
   slot. Override --brand-glyph to swap the mark per project.
   -------------------------------------------------------------------------- */

brand-mark {
  display: inline-block;
  inline-size: var(--brand-mark-size);
  block-size: var(--brand-mark-size);
  background-color: currentColor;
  -webkit-mask-image: var(--brand-glyph);
          mask-image: var(--brand-glyph);
  -webkit-mask-repeat: no-repeat;
          mask-repeat: no-repeat;
  -webkit-mask-position: center;
          mask-position: center;
  -webkit-mask-size: contain;
          mask-size: contain;
  color: var(--text-primary);
  vertical-align: middle;
  flex-shrink: 0;
}

brand-mark[size="sm"] { inline-size: var(--brand-mark-size-sm); block-size: var(--brand-mark-size-sm); }
brand-mark[size="lg"] { inline-size: calc(var(--brand-mark-size) * 2); block-size: calc(var(--brand-mark-size) * 2); }

brand-mark[class~="brand-mark--accent"] { color: var(--accent); }
brand-mark[class~="brand-mark--inverse"] { color: var(--text-inverse); }