/*
 * OK 2.0 semantic foundation.
 * Propshaft loads app stylesheets in sorted order, so 00_tokens.css establishes
 * primitives before this file maps them to interface meaning.
 */

:root {
  color-scheme: dark;

  --color-page: var(--ok-void);
  --color-surface: var(--ok-panel);
  --color-text: var(--ok-paper);
  --color-text-muted: var(--ok-muted);
  --color-action: var(--ok-signal);
  --color-conflict: var(--ok-signal);
  --color-confirmed: var(--ok-gold);
  --color-provenance: var(--ok-gold);
  --color-focus: var(--ok-gold);
  --color-rule: color-mix(in srgb, var(--ok-muted) 36%, transparent);
  --color-rule-strong: color-mix(in srgb, var(--ok-muted) 68%, transparent);
  --color-surface-active: color-mix(in srgb, var(--ok-signal) 12%, var(--ok-panel));
  --color-surface-focus: color-mix(in srgb, var(--ok-gold) 10%, var(--ok-panel));
  --color-on-action: var(--ok-void);

  --font-mono: "OK Berkeley Mono", "SFMono-Regular", "Cascadia Mono", "Roboto Mono", Consolas, "Liberation Mono", monospace;
  --font-interface: var(--font-mono);

  --text-metadata: 0.75rem;
  --text-admin: 0.875rem;
  --text-body: 1rem;
  --text-lead: 1.125rem;
  --text-title: clamp(2rem, 5vw, 3rem);
  --text-display: clamp(2.5rem, 8vw, 5rem);
  --line-tight: 1;
  --line-heading: 1.08;
  --line-body: 1.55;
  --tracking-display: -0.04em;
  --tracking-label: 0.08em;
  --measure: 68ch;
  --page-width: 80rem;
}

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

html {
  background: var(--color-page);
  font-family: var(--font-interface);
  scroll-behavior: smooth;
  text-size-adjust: 100%;
}

body {
  background: var(--color-page);
  color: var(--color-text);
  font-family: var(--font-interface);
  font-size: var(--text-body);
  line-height: var(--line-body);
  margin: 0;
  min-block-size: 100dvh;
}

body.admin-shell {
  font-size: var(--text-admin);
}

::selection {
  background: var(--color-action);
  color: var(--color-on-action);
}

a {
  color: inherit;
  text-decoration-color: var(--color-action);
  text-decoration-thickness: var(--ok-rule);
  text-underline-offset: var(--ok-space-1);
}

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

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

button,
input,
select,
textarea {
  color: inherit;
  font: inherit;
}

button,
input[type="button"],
input[type="submit"],
input[type="reset"] {
  min-block-size: var(--ok-control-height);
}

:where(a, button, input, select, textarea, [tabindex]):focus-visible {
  outline: var(--ok-focus-rule) solid var(--color-focus);
  outline-offset: var(--ok-focus-rule);
}

.skip-link {
  background: var(--color-focus);
  color: var(--color-page);
  font-size: var(--text-metadata);
  font-weight: 700;
  inset-block-start: var(--ok-space-2);
  inset-inline-start: var(--ok-space-2);
  letter-spacing: var(--tracking-label);
  padding: var(--ok-space-2) var(--ok-space-3);
  position: fixed;
  text-transform: uppercase;
  transform: translateY(calc(-100% - var(--ok-space-4)));
  transition: transform var(--ok-motion-duration) ease;
  z-index: 2;
}

.skip-link:focus {
  color: var(--color-page);
  transform: translateY(0);
}

.flash {
  border: var(--ok-rule) solid var(--color-rule-strong);
  margin: var(--ok-space-4);
  padding: var(--ok-space-3) var(--ok-space-4);
}

.flash--alert {
  border-inline-start: var(--ok-space-1) solid var(--color-conflict);
}

.flash--notice {
  border-inline-start: var(--ok-space-1) solid var(--color-confirmed);
}

.button,
button,
input[type="button"],
input[type="submit"],
input[type="reset"] {
  align-items: center;
  background: var(--color-action);
  border: var(--ok-rule) solid var(--color-action);
  border-radius: 0;
  color: var(--color-on-action);
  cursor: pointer;
  display: inline-flex;
  font-size: var(--text-admin);
  font-weight: 700;
  gap: var(--ok-space-2);
  justify-content: center;
  letter-spacing: var(--tracking-label);
  min-block-size: var(--ok-control-height);
  padding: var(--ok-space-2) var(--ok-space-4);
  text-decoration: none;
  text-transform: uppercase;
  transition:
    background-color var(--ok-motion-duration) ease,
    border-color var(--ok-motion-duration) ease,
    color var(--ok-motion-duration) ease,
    transform var(--ok-motion-duration) ease;
}

.button:hover,
button:hover,
input[type="button"]:hover,
input[type="submit"]:hover,
input[type="reset"]:hover {
  background: var(--color-text);
  border-color: var(--color-text);
  color: var(--color-page);
}

.button:active,
button:active,
input[type="button"]:active,
input[type="submit"]:active,
input[type="reset"]:active {
  transform: translateY(var(--ok-motion-distance));
}

.button[aria-disabled="true"],
button:disabled,
input:disabled {
  background: var(--color-surface);
  border-color: var(--color-rule-strong);
  color: var(--color-text-muted);
  cursor: not-allowed;
  transform: none;
}

.button--secondary {
  background: var(--color-surface);
  border-color: var(--color-rule-strong);
  color: var(--color-text);
}

.button--quiet {
  background: transparent;
  border-color: transparent;
  color: var(--color-text-muted);
}

.button--conflict {
  background: transparent;
  border-color: var(--color-conflict);
  color: var(--color-conflict);
}

label,
.field-label {
  display: block;
  font-size: var(--text-metadata);
  font-weight: 700;
  letter-spacing: var(--tracking-label);
  margin-block-end: var(--ok-space-2);
  text-transform: uppercase;
}

input:not([type="checkbox"]):not([type="radio"]):not([type="button"]):not([type="submit"]):not([type="reset"]),
select,
textarea {
  background: var(--color-page);
  border: var(--ok-rule) solid var(--color-rule-strong);
  border-radius: 0;
  inline-size: 100%;
  min-block-size: var(--ok-control-height);
  padding: var(--ok-space-2) var(--ok-space-3);
  transition:
    background-color var(--ok-motion-duration) ease,
    border-color var(--ok-motion-duration) ease;
}

textarea {
  min-block-size: calc(var(--ok-space-20) + var(--ok-space-8));
  resize: vertical;
}

input::placeholder,
textarea::placeholder {
  color: var(--color-text-muted);
  opacity: 1;
}

input[aria-invalid="true"],
select[aria-invalid="true"],
textarea[aria-invalid="true"] {
  border-color: var(--color-conflict);
}

.field-help,
.field-error {
  display: block;
  font-size: var(--text-metadata);
  margin-block-start: var(--ok-space-2);
}

.field-help {
  color: var(--color-text-muted);
}

.field-error {
  color: var(--color-conflict);
  font-weight: 700;
}

.tabular,
table,
time,
[data-numeric] {
  font-variant-numeric: tabular-nums slashed-zero;
}

.meta {
  color: var(--color-text-muted);
  font-size: var(--text-metadata);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
}

.display {
  font-size: var(--text-display);
  font-weight: 700;
  letter-spacing: var(--tracking-display);
  line-height: var(--line-tight);
  text-transform: uppercase;
}

.session-shell {
  align-items: center;
  display: grid;
  min-block-size: 100dvh;
  padding: var(--ok-space-4);
  place-items: center;
}

.session-panel {
  border: var(--ok-rule) solid var(--color-rule-strong);
  inline-size: min(100%, calc(var(--ok-space-24) * 5));
}

.session-header {
  border-block-end: var(--ok-rule) solid var(--color-rule-strong);
  padding: var(--ok-space-8);
}

.session-header h1 {
  font-size: var(--text-title);
  line-height: var(--line-heading);
  margin: var(--ok-space-4) 0;
  text-transform: uppercase;
}

.session-header p:last-child {
  color: var(--color-text-muted);
  margin: 0;
  max-inline-size: var(--measure);
}

.session-form {
  display: grid;
  gap: var(--ok-space-5);
  padding: var(--ok-space-8);
}

.session-form button,
.session-form input[type="submit"] {
  inline-size: 100%;
}

.session-footer {
  border-block-start: var(--ok-rule) solid var(--color-rule-strong);
  margin: 0;
  padding: var(--ok-space-3) var(--ok-space-8);
}

@media (max-width: 30rem) {
  .session-header,
  .session-form {
    padding: var(--ok-space-5);
  }

  .session-footer {
    padding-inline: var(--ok-space-5);
  }
}

/*
 * color-mix() has broad modern-browser support (MDN Baseline since May 2023),
 * verified 2026-07-20. The app's Rails modern-browser gate is the support floor.
 * Focus geometry follows WCAG 2.2 Focus Appearance guidance; verified 2026-07-20.
 */

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

  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 1ms !important;
  }
}