/* Ephemeral design tokens.
   World: a cold window at night. Night glass, frost haze, one sodium-amber
   accent that only ever marks something you can act on. Light mode is the
   same pane in the morning: pale frost, ink-navy text, the same amber.
   The widget cannot inherit this file through its Shadow DOM and inlines a
   subset (see widget/ephemeral.js). */

@font-face {
  font-family: 'Bricolage Grotesque';
  font-style: normal;
  font-weight: 200 800;
  font-stretch: 100%;
  font-display: swap;
  src: url('./fonts/bricolage-grotesque-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC,
    U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215,
    U+FEFF, U+FFFD;
}

:root {
  color-scheme: dark light;

  /* Type */
  --font-display: 'Bricolage Grotesque', ui-sans-serif, system-ui, sans-serif;
  --font-ui: 'Bricolage Grotesque', ui-sans-serif, system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-code: ui-monospace, 'SF Mono', 'Cascadia Code', Menlo, Consolas, monospace;

  --step--1: 0.875rem;
  --step-0: 1.0625rem;
  --step-1: 1.25rem;
  --step-2: 1.625rem;
  --step-3: clamp(1.9rem, 1.4rem + 2vw, 2.6rem);
  --step-4: clamp(2.5rem, 1.6rem + 4vw, 4.25rem);
  --step-5: clamp(3rem, 1.5rem + 7vw, 6rem);
  --leading-tight: 1.02;
  --leading-snug: 1.2;
  --leading-body: 1.55;
  --tracking-display: -0.03em;

  /* Space (4px base) */
  --s-1: 0.25rem;
  --s-2: 0.5rem;
  --s-3: 0.75rem;
  --s-4: 1rem;
  --s-5: 1.5rem;
  --s-6: 2rem;
  --s-7: 3rem;
  --s-8: 4.5rem;
  --s-9: 7rem;
  --gutter: clamp(1rem, 0.5rem + 3vw, 3rem);
  --measure: 66ch;

  /* Shape */
  --r-sm: 6px;
  --r-md: 12px;
  --r-lg: 16px;
  --r-pill: 999px;

  /* Motion: exponential ease-out, breath-soft, never bouncy */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --dur-fast: 140ms;
  --dur: 260ms;
  --dur-slow: 640ms;
  --fog-return: 5200ms;

  /* Night glass (default) */
  --glass: oklch(0.17 0.03 252);
  --glass-deep: oklch(0.12 0.026 254);
  --outside: oklch(0.12 0.026 254); /* the scene behind the pane */
  --glass-raised: oklch(0.22 0.032 250);
  --frost: oklch(0.62 0.03 240 / 0.42);
  --frost-grain: oklch(0.9 0.02 240 / 0.07);
  --ink: oklch(0.97 0.008 240);
  --ink-soft: oklch(0.84 0.022 240);
  --ink-faint: oklch(0.7 0.028 242);
  --line: oklch(0.97 0.01 240 / 0.14);
  --line-strong: oklch(0.97 0.01 240 / 0.3);
  --amber: oklch(0.81 0.15 72);
  --amber-hover: oklch(0.87 0.14 78);
  --amber-ink: oklch(0.81 0.15 72); /* amber used as text on the ground */
  --on-amber: oklch(0.17 0.04 60);
  --amber-glow: oklch(0.81 0.15 72 / 0.18);
  --live: oklch(0.84 0.12 170);
  --danger: oklch(0.74 0.15 25);
  --shadow: 0 1px 2px oklch(0.05 0.02 254 / 0.4), 0 12px 32px -12px oklch(0.05 0.02 254 / 0.6);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme='dark']) {
    --glass: oklch(0.955 0.011 240);
    --glass-deep: oklch(0.915 0.016 242);
    --outside: oklch(0.82 0.035 238);
    --glass-raised: oklch(0.99 0.004 240);
    --frost: oklch(0.99 0.004 240 / 0.72);
    --frost-grain: oklch(0.4 0.03 250 / 0.05);
    --ink: oklch(0.24 0.045 256);
    --ink-soft: oklch(0.38 0.045 256);
    --ink-faint: oklch(0.42 0.04 256);
    --line: oklch(0.24 0.045 256 / 0.13);
    --line-strong: oklch(0.24 0.045 256 / 0.28);
    --amber: oklch(0.79 0.155 70);
    --amber-hover: oklch(0.74 0.16 64);
    --amber-ink: oklch(0.5 0.13 55);
    --on-amber: oklch(0.2 0.04 60);
    --amber-glow: oklch(0.79 0.155 70 / 0.22);
    --live: oklch(0.52 0.11 170);
    --danger: oklch(0.52 0.17 25);
    --shadow: 0 1px 2px oklch(0.3 0.04 254 / 0.12), 0 12px 32px -14px oklch(0.3 0.04 254 / 0.28);
  }
}

:root[data-theme='light'] {
  --glass: oklch(0.955 0.011 240);
  --glass-deep: oklch(0.915 0.016 242);
  --outside: oklch(0.82 0.035 238);
  --glass-raised: oklch(0.99 0.004 240);
  --frost: oklch(0.99 0.004 240 / 0.72);
  --frost-grain: oklch(0.4 0.03 250 / 0.05);
  --ink: oklch(0.24 0.045 256);
  --ink-soft: oklch(0.38 0.045 256);
  --ink-faint: oklch(0.42 0.04 256);
  --line: oklch(0.24 0.045 256 / 0.13);
  --line-strong: oklch(0.24 0.045 256 / 0.28);
  --amber: oklch(0.79 0.155 70);
  --amber-hover: oklch(0.74 0.16 64);
  --amber-ink: oklch(0.5 0.13 55);
  --on-amber: oklch(0.2 0.04 60);
  --amber-glow: oklch(0.79 0.155 70 / 0.22);
  --live: oklch(0.52 0.11 170);
  --danger: oklch(0.52 0.17 25);
  --shadow: 0 1px 2px oklch(0.3 0.04 254 / 0.12), 0 12px 32px -14px oklch(0.3 0.04 254 / 0.28);
}

@media (prefers-reduced-motion: reduce) {
  :root {
    --dur-fast: 0ms;
    --dur: 0ms;
    --dur-slow: 0ms;
  }
}

/* Base: shared by the landing page and the room */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scrollbar-color: var(--line-strong) var(--glass-deep);
}

body {
  margin: 0;
  background: var(--glass);
  color: var(--ink);
  font: 400 var(--step-0) / var(--leading-body) var(--font-ui);
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  caret-color: var(--amber);
}

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

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

a {
  color: inherit;
  text-decoration-color: var(--amber);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.22em;
}

a:hover {
  color: var(--amber-ink);
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  letter-spacing: var(--tracking-display);
  line-height: var(--leading-snug);
  text-wrap: balance;
  margin: 0;
}

p {
  text-wrap: pretty;
}

code,
kbd,
pre {
  font-family: var(--font-code);
  font-size: 0.92em;
}

.num {
  font-variant-numeric: tabular-nums;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* Buttons: amber means "you can act on this", nothing else is amber */
.btn {
  --_bg: var(--amber);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s-2);
  min-height: 48px;
  padding: 0 var(--s-5);
  border: 0;
  border-radius: var(--r-pill);
  background: var(--_bg);
  color: var(--on-amber);
  font: 600 var(--step-0) / 1 var(--font-ui);
  letter-spacing: -0.01em;
  text-decoration: none;
  cursor: pointer;
  box-shadow: 0 0 0 0 var(--amber-glow);
  transition:
    background-color var(--dur-fast) var(--ease-out),
    box-shadow var(--dur) var(--ease-out),
    transform var(--dur-fast) var(--ease-out);
}

.btn:hover {
  --_bg: var(--amber-hover);
  color: var(--on-amber);
  box-shadow: 0 0 0 8px var(--amber-glow);
}

.btn:active {
  transform: scale(0.97);
}

.btn:disabled {
  cursor: not-allowed;
  opacity: 0.45;
  box-shadow: none;
}

.btn-quiet {
  --_bg: transparent;
  color: var(--ink);
  box-shadow: inset 0 0 0 1px var(--line-strong);
}

.btn-quiet:hover {
  --_bg: var(--glass-raised);
  color: var(--ink);
  box-shadow: inset 0 0 0 1px var(--ink-faint);
}

.icon {
  width: 1.15em;
  height: 1.15em;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
}