/* Undercooked — base stylesheet (phase 01 shell).
 *
 * Rules that later phases must keep:
 *   - every byte is same-origin: no @import, no web fonts, no remote images (A12);
 *   - the palette, spacing and type scale exist only as custom properties below;
 *   - 44x44 minimum hit targets and >= 4.5:1 text contrast (PLAN.md phase 14);
 *   - the layout is fluid from a 360px phone to a 4K desktop without breakpoints;
 *   - motion is decorative: prefers-reduced-motion turns all of it off.
 */

:root {
  /* Palette — warm kitchen, dark by default. Text pairs are >= 4.5:1. */
  --uc-bg: #1a1713;
  --uc-surface: #241f1a;
  --uc-surface-2: #2f2820;
  --uc-line: #857259; /* 3.1:1 on every surface: UI edges are visible (WCAG 1.4.11) */
  --uc-ink: #f6f1e7; /* 13.9:1 on --uc-bg */
  --uc-ink-muted: #cfc5b5; /* 8.6:1 on --uc-bg */
  --uc-accent: #ff9f1c; /* 7.6:1 on --uc-bg */
  --uc-accent-ink: #1a1713; /* 7.6:1 on --uc-accent */
  --uc-danger: #ff8a80; /* 7.4:1 on --uc-bg */
  --uc-focus: #ffe066;

  /* Fluid type scale: 360px phone -> 3840px desktop, no breakpoints needed. */
  --uc-step--1: clamp(0.78rem, 0.74rem + 0.2vw, 0.92rem);
  --uc-step-0: clamp(1rem, 0.95rem + 0.3vw, 1.2rem);
  --uc-step-1: clamp(1.25rem, 1.15rem + 0.6vw, 1.7rem);
  --uc-step-2: clamp(1.7rem, 1.4rem + 1.6vw, 3rem);

  --uc-space-1: 0.5rem;
  --uc-space-2: 0.75rem;
  --uc-space-3: 1.25rem;
  --uc-space-4: 2rem;

  --uc-radius: 0.65rem;
  --uc-hit: 44px; /* WCAG 2.5.5 minimum target size */
  --uc-content: 74rem;
  --uc-font: ui-sans-serif, system-ui, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --uc-font-ui: ui-rounded, "Segoe UI Variable Display", var(--uc-font);
  --uc-ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

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

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

body {
  margin: 0;
  min-height: 100svh;
  display: grid;
  grid-template-rows: 1fr auto;
  gap: var(--uc-space-3);
  padding: max(var(--uc-space-3), env(safe-area-inset-top))
    max(var(--uc-space-2), env(safe-area-inset-right))
    max(var(--uc-space-3), env(safe-area-inset-bottom))
    max(var(--uc-space-2), env(safe-area-inset-left));
  background: radial-gradient(120% 90% at 50% -10%, var(--uc-surface-2), var(--uc-bg) 60%);
  color: var(--uc-ink);
  font-family: var(--uc-font);
  font-size: var(--uc-step-0);
  line-height: 1.45;
  text-rendering: optimizeLegibility;
}

.shell,
.colophon {
  width: 100%;
  max-width: var(--uc-content);
  margin-inline: auto;
}

.masthead {
  text-align: center;
}

.wordmark {
  margin: 0;
  font-family: var(--uc-font-ui);
  font-size: var(--uc-step-2);
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--uc-accent);
}

.tagline,
.hint,
.colophon p {
  margin: var(--uc-space-1) 0 0;
  color: var(--uc-ink-muted);
  font-size: var(--uc-step--1);
}

.panel {
  display: grid;
  gap: var(--uc-space-2);
  margin: var(--uc-space-3) auto 0;
  padding: var(--uc-space-3);
  max-width: 34rem;
  background: var(--uc-surface);
  border: 1px solid var(--uc-line);
  border-radius: var(--uc-radius);
}

.panel h2 {
  margin: 0;
  font-family: var(--uc-font-ui);
  font-size: var(--uc-step-1);
}

.join-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--uc-space-2);
}

label {
  display: block;
  margin-bottom: var(--uc-space-1);
  font-size: var(--uc-step--1);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--uc-ink-muted);
}

input[type="text"] {
  flex: 1 1 8.5rem;
  /* An <input>'s intrinsic width is its default 20 characters, which would widen
     the whole fluid layout on a 360px phone. The value is 5 characters. */
  min-width: 0;
  min-height: var(--uc-hit);
  padding: 0 var(--uc-space-2);
  background: var(--uc-bg);
  color: var(--uc-ink);
  border: 1px solid var(--uc-line);
  border-radius: var(--uc-radius);
  font: inherit;
  font-size: var(--uc-step-1);
  letter-spacing: 0.35em;
  text-transform: uppercase;
}

input[type="text"]::placeholder {
  color: #8d8272; /* 4.6:1 on --uc-bg: placeholder text is real text */
  letter-spacing: 0.35em;
}

.btn {
  min-height: var(--uc-hit);
  min-width: var(--uc-hit);
  padding: 0 var(--uc-space-3);
  background: var(--uc-surface-2);
  color: var(--uc-ink);
  border: 1px solid var(--uc-line);
  border-radius: var(--uc-radius);
  font: inherit;
  font-size: var(--uc-step-0);
  font-weight: 600;
  cursor: pointer;
  transition:
    transform 120ms var(--uc-ease),
    background-color 120ms var(--uc-ease);
}

.btn:hover {
  background: #3b3226;
}

.btn:active {
  transform: translateY(1px);
}

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

.btn-primary:hover {
  background: #ffb445;
}

/* Visible focus for keyboard and low-vision users; never remove this. */
:where(a, button, input, [tabindex]):focus-visible {
  outline: 3px solid var(--uc-focus);
  outline-offset: 2px;
  border-radius: var(--uc-radius);
}

.status {
  min-height: calc(var(--uc-hit) - 8px);
  padding: var(--uc-space-2);
  background: var(--uc-bg);
  border: 1px dashed var(--uc-line);
  border-radius: var(--uc-radius);
  font-size: var(--uc-step--1);
}

.status[data-kind="error"] {
  color: var(--uc-danger);
  border-color: var(--uc-danger);
}

#kcanvas {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  background: #0f0d0b;
  border: 1px solid var(--uc-line);
  border-radius: var(--uc-radius);
}

#kcanvas[hidden] {
  display: none;
}

code {
  font-family: ui-monospace, "Cascadia Mono", "Segoe UI Mono", Menlo, monospace;
  font-size: 0.95em;
  color: var(--uc-accent);
}

.colophon {
  text-align: center;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .btn:active {
    transform: none;
  }
}