/*
 * pair-hud — Glasses HUD theme.
 *
 * Additive-display rules:
 *   - Background is #0a0a0f (dark gray, never #000 which is transparent).
 *   - Foreground text is pure #fff at 100% opacity for max photonic output.
 *   - No SVGs. Spinner is CSS, PIN digits are plain type.
 *   - 8 px safe margin on every screen (rubberbanding clips the edge).
 *   - 88 px minimum tap target on every .focusable.
 *   - Focus state = cyan outline + soft glow. Animation curves from the
 *     display guidelines.
 */

:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #14141f;
  --bg-tertiary: #1e1e2e;
  --bg-card: #1a1a2e;
  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --text-muted: #606070;
  --accent-primary: #00d4ff;
  --accent-secondary: #00ff88;
  --danger: #ff4466;
  --focus-ring: #00d4ff;
  --focus-glow: rgba(0, 212, 255, 0.4);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html,
body {
  width: 600px;
  height: 600px;
  overflow: hidden;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-feature-settings: 'tnum' 1;
  -webkit-font-smoothing: antialiased;
}

#app {
  position: relative;
  width: 600px;
  height: 600px;
  padding: 8px; /* 8 dp safe margin */
}

/* ---------- Screens ---------- */

.screen {
  position: absolute;
  top: 8px;
  left: 8px;
  right: 8px;
  bottom: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
  padding: 24px;
}

.screen.hidden {
  display: none;
}

.screen-title {
  font-size: 22px;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.screen-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  text-align: center;
  max-width: 520px;
  line-height: 1.4;
}

/* ---------- Focusable / buttons ---------- */

.focusable {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 88px;
  min-width: 160px;
  padding: 20px 28px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 20px;
  font-weight: 500;
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition:
    transform 475ms cubic-bezier(0.6, 0, 0.4, 1),
    border-color 300ms cubic-bezier(0.4, 0.04, 0.5, 1),
    box-shadow 300ms cubic-bezier(0.4, 0.04, 0.5, 1),
    background 300ms cubic-bezier(0.4, 0.04, 0.5, 1);
  user-select: none;
}

.focusable:focus {
  outline: none;
  border-color: var(--focus-ring);
  box-shadow: 0 0 24px var(--focus-glow);
  background: var(--bg-card);
}

.focusable.primary {
  background: transparent;
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.focusable.primary:focus {
  background: rgba(0, 212, 255, 0.15);
  color: var(--text-primary);
}

.focusable.danger {
  color: var(--danger);
  border-color: transparent;
}

.focusable.danger:focus {
  border-color: var(--danger);
  box-shadow: 0 0 24px rgba(255, 68, 102, 0.4);
}

/* ---------- #connecting ---------- */

.spinner {
  width: 72px;
  height: 72px;
  border: 6px solid var(--bg-tertiary);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 900ms linear infinite;
}

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

/* ---------- #pairing ---------- */

.pin-display {
  font-size: 160px;
  line-height: 1;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
  text-align: center;
  /* Soft cyan halo so the digits feel "lit" but stay pure white. */
  text-shadow:
    0 0 18px rgba(0, 212, 255, 0.35),
    0 0 2px rgba(255, 255, 255, 0.6);
}

.pin-hint {
  font-size: 18px;
  color: var(--text-secondary);
  text-align: center;
  line-height: 1.4;
}

.pin-hint .url {
  color: var(--accent-primary);
  font-weight: 600;
  word-break: break-all;
}

.pin-ttl {
  font-size: 14px;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

/* ---------- #paired ---------- */

.big-state {
  font-size: 72px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  text-align: center;
}

.big-state .glyph {
  font-size: 56px;
  margin-right: 12px;
  color: var(--accent-secondary);
}

/* ---------- #content ---------- */

.content-payload {
  font-size: 56px;
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-primary);
  text-align: center;
  max-width: 540px;
  overflow-wrap: anywhere;
  word-break: break-word;
  transition: opacity 300ms cubic-bezier(0.4, 0.04, 0.5, 1);
}

.content-payload.auto-shrink-md {
  font-size: 44px;
}

.content-payload.auto-shrink-sm {
  font-size: 32px;
}

.content-meta {
  font-size: 14px;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.content-actions {
  display: flex;
  gap: 16px;
  margin-top: auto;
}

/* ---------- #disconnected / #error ---------- */

.status-glyph {
  font-size: 64px;
  line-height: 1;
}

.status-glyph.danger {
  color: var(--danger);
}

.status-message {
  font-size: 24px;
  color: var(--text-primary);
  text-align: center;
  max-width: 520px;
}

/* ---------- utility ---------- */

.hidden {
  display: none !important;
}

.row {
  display: flex;
  flex-direction: row;
  gap: 16px;
  align-items: center;
  justify-content: center;
}

.col {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
  justify-content: center;
}

/* Respect reduced-motion preference (accessibility). */
@media (prefers-reduced-motion: reduce) {
  .focusable,
  .content-payload {
    transition: none;
  }
  .spinner {
    animation-duration: 2s;
  }
}