/* File: web/assets/styles.css
 * Purpose: Minimal styles for signup / teach / student / loopback pages
 *          and the dev-only debug overlay.
 * Last updated: Sprint 4 (2026-04-17) -- +quality badge, reconnect + floor notices
 */

:root {
  color-scheme: light dark;
  --fg: #111;
  --bg: #fafafa;
  --accent: #244;
  --ok: #2a7a2a;
  --bad: #b23a3a;
}
@media (prefers-color-scheme: dark) {
  :root { --fg: #f3f3f3; --bg: #161616; --accent: #8cf; --ok: #7ec77e; --bad: #e77a7a; }
}

body {
  margin: 0;
  font: 16px/1.45 system-ui, -apple-system, sans-serif;
  color: var(--fg);
  background: var(--bg);
}
main {
  max-width: 42rem;
  margin: 0 auto;
  padding: 2rem 1rem;
}
h1 { font-size: 1.6rem; margin: 0 0 1rem; }
h2 { font-size: 1.1rem; margin: 1.5rem 0 0.5rem; color: var(--accent); }

form label { display: block; margin: 0.5rem 0; }
form input { width: 100%; padding: 0.4rem; font: inherit; box-sizing: border-box; }
form button, button { padding: 0.5rem 1rem; font: inherit; }

ul { list-style: none; padding: 0; }
li { padding: 0.25rem 0; border-bottom: 1px solid #ccc3; }
li button { margin-left: 0.5rem; }

#error { color: #c00; min-height: 1.2em; }

.setup-note { background: #ffd; padding: 0.5rem 0.75rem; border-left: 3px solid var(--accent); }
@media (prefers-color-scheme: dark) {
  .setup-note { background: #332; }
}
details.why { display: inline; margin-left: 0.5rem; }
details.why summary { cursor: pointer; color: var(--accent); display: inline; }
details.why[open] { display: block; margin-top: 0.5rem; }

#unmute-audio { margin: 0.5rem 0; }

#remote-audio { display: none; }

#loopback-results { white-space: pre-wrap; padding: 0.75rem; background: #0001; border-radius: 4px; }
@media (prefers-color-scheme: dark) {
  #loopback-results { background: #fff1; }
}

.sb-debug-panel {
  position: fixed;
  bottom: 0.5rem;
  right: 0.5rem;
  max-width: 20rem;
  max-height: 60vh;
  overflow: auto;
  padding: 0.5rem 0.75rem;
  background: rgba(0, 0, 0, 0.8);
  color: #eee;
  font: 11px/1.35 ui-monospace, monospace;
  border-radius: 4px;
  z-index: 9999;
}
.sb-debug-panel h3 { margin: 0 0 0.25rem; font-size: 11px; color: #fc8; }
.sb-debug-panel dl { margin: 0; display: grid; grid-template-columns: auto auto; gap: 0 0.5rem; }
.sb-debug-panel dt { color: #aaa; }
.sb-debug-panel dd { margin: 0; }
.sb-debug-panel dd.ok { color: var(--ok); }
.sb-debug-panel dd.bad { color: var(--bad); }

/* --- Sprint 3: two-tile video layout + controls + tier badges --- */

.tiles {
  display: grid;
  grid-template-columns: 1fr;
  grid-template-rows: 1fr auto;
  gap: 0.5rem;
  margin-top: 0.75rem;
}
@media (min-width: 48rem) {
  .tiles {
    grid-template-columns: 1fr 12rem;
    grid-template-rows: 1fr;
  }
}
.tile { position: relative; background: #000; min-height: 12rem; overflow: hidden; }
.tile video { width: 100%; height: 100%; object-fit: cover; background: #000; display: block; }
.tile.self { min-height: 8rem; }
.tile #unmute-audio {
  position: absolute;
  inset: auto 0.5rem 0.5rem auto;
}

.controls { display: flex; gap: 0.5rem; margin-top: 0.75rem; flex-wrap: wrap; }
.controls button { padding: 0.5rem 1rem; }
.controls button[aria-pressed="true"] {
  background: var(--accent);
  color: #fff;
}

.tier-badge {
  display: inline-block;
  font-size: 0.8em;
  padding: 0.1em 0.4em;
  border-radius: 0.25em;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.tier-badge.supported { background: #d4edda; color: #155724; }
.tier-badge.degraded  { background: #fff3cd; color: #856404; }
.tier-badge.unworkable { background: #f8d7da; color: #721c24; }
.tier-reason { color: #666; font-size: 0.9em; }

#block-notice {
  background: #f8d7da; color: #721c24;
  padding: 1rem; border-radius: 4px; margin: 1rem 0;
}
#degraded-notice {
  background: #fff3cd; color: #856404;
  padding: 0.5rem 0.75rem; border-left: 3px solid #e0a800; margin: 0.75rem 0;
}

@media (prefers-color-scheme: dark) {
  .tier-badge.supported { background: #1e3a24; color: #a5d6a7; }
  .tier-badge.degraded  { background: #3a3320; color: #ffe082; }
  .tier-badge.unworkable { background: #3a1f24; color: #ef9a9a; }
  .tier-reason { color: #aaa; }
  #block-notice { background: #3a1f24; color: #ef9a9a; }
  #degraded-notice { background: #3a3320; color: #ffe082; border-color: #c79400; }
}

/* Sprint 4: connection-quality badge + reconnect + floor-violation UI */
.quality-badge {
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-left: 0.5rem;
  vertical-align: middle;
}
.quality-badge.good { background: #dff3dd; color: #1a3d1a; }
.quality-badge.fair { background: #fff2cc; color: #6b5100; }
.quality-badge.poor { background: #fbe1e1; color: #7a1f1f; }

.reconnect-banner {
  background: #fff2cc;
  color: #6b5100;
  padding: 0.5rem 0.75rem;
  border-radius: 4px;
  margin: 0.5rem 0;
  text-align: center;
  font-weight: 500;
}

.floor-violation {
  background: #fbe1e1;
  color: #7a1f1f;
  padding: 1rem 1.25rem;
  border-radius: 6px;
  margin: 1rem 0;
  border: 1px solid #e7b6b6;
}
.floor-violation h2 { margin-top: 0; }

@media (prefers-color-scheme: dark) {
  .quality-badge.good { background: #1f3f1f; color: #bfe6bf; }
  .quality-badge.fair { background: #3f3a1f; color: #ebd28a; }
  .quality-badge.poor { background: #3f1f1f; color: #f1b6b6; }
  .reconnect-banner { background: #3f3a1f; color: #ebd28a; }
  .floor-violation { background: #3f1f1f; color: #f1b6b6; border-color: #5f3030; }
}