/* MLT web app — mobile-first, dark, no framework. */

:root {
  --bg: #101418;
  --panel: #1a2027;
  --border: #2c3540;
  --text: #e6edf3;
  --muted: #8b98a5;
  --accent: #4da3ff;
  --accent-press: #2f8df5;
  --ok: #3fb950;
  --error: #f85149;
}

* {
  box-sizing: border-box;
}

/* Author display rules (.panel { display: flex }, #qr-stage { display: flex })
   would otherwise override the UA's [hidden] { display: none } — which made
   the black #qr-stage overlay cover the whole page on first load. */
[hidden] {
  display: none !important;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
}

header {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
}

h1 {
  font-size: 1.25rem;
  margin: 0;
  letter-spacing: 0.1em;
}

h2 {
  font-size: 1rem;
  margin: 1.25rem 0 0.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

#role-tabs {
  display: flex;
  gap: 0.5rem;
  margin-left: auto;
}

#role-tabs button {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.4rem 1rem;
  font-size: 0.95rem;
}

#role-tabs button[aria-selected="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

main {
  flex: 1;
  width: 100%;
  max-width: 560px;
  margin: 0 auto;
  padding: 1rem;
}

.panel {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

label {
  font-size: 0.9rem;
  color: var(--muted);
}

input[type="text"],
select {
  width: 100%;
  padding: 0.65rem 0.75rem;
  font-size: 1rem;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
}

fieldset {
  border: 1px solid var(--border);
  border-radius: 8px;
  display: flex;
  gap: 1.25rem;
  padding: 0.6rem 0.9rem;
}

legend {
  color: var(--muted);
  font-size: 0.85rem;
  padding: 0 0.3rem;
}

fieldset label {
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

button.primary {
  margin-top: 0.5rem;
  padding: 0.8rem;
  font-size: 1.05rem;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: 10px;
}

button.primary:active {
  background: var(--accent-press);
}

button.primary:disabled {
  opacity: 0.5;
}

button.small {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.2rem 0.6rem;
  font-size: 0.8rem;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.status {
  margin: 0.25rem 0 0;
  min-height: 1.3em;
}

.status.ok {
  color: var(--ok);
}

.status.error {
  color: var(--error);
}

.note {
  color: var(--muted);
  font-size: 0.85rem;
  margin: 0;
}

#level-meter {
  height: 10px;
  border-radius: 5px;
  background: var(--panel);
  border: 1px solid var(--border);
  overflow: hidden;
}

#level-fill {
  height: 100%;
  width: 0%;
  background: var(--ok);
  transition: width 80ms linear;
}

#log {
  list-style: none;
  margin: 0;
  padding: 0.5rem;
  min-height: 8rem;
  max-height: 40dvh;
  overflow-y: auto;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
}

#log li {
  padding: 0.3rem 0.2rem;
  border-bottom: 1px solid var(--border);
  word-break: break-word;
}

#log li:last-child {
  border-bottom: none;
}

#log li.error {
  color: var(--error);
}

#log li.device {
  color: var(--muted);
}

#log time {
  color: var(--muted);
  font-size: 0.8rem;
  margin-right: 0.5rem;
}

#qr-stage {
  position: fixed;
  inset: 0;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
}

#qr-canvas {
  width: min(90vw, 90vh);
  height: min(90vw, 90vh);
  image-rendering: pixelated;
}

#camera-preview {
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--border);
}

footer {
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--border);
}