/* Resotest — тест разрешения экрана и видео */

:root {
  --bg: #0f1115;
  --bg-elevated: #171a21;
  --bg-card: #1c212b;
  --border: #2a3140;
  --text: #e8ecf4;
  --text-muted: #9aa3b5;
  --accent: #5b8cff;
  --accent-hover: #7aa1ff;
  --accent-soft: rgba(91, 140, 255, 0.15);
  --ok: #3ecf8e;
  --warn: #e6b84d;
  --error: #f07178;
  --radius: 12px;
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  --font: system-ui, -apple-system, 'Segoe UI', Roboto, Ubuntu, Cantarell,
    'Noto Sans', sans-serif;
  --mono: ui-monospace, 'Cascadia Code', 'SF Mono', Menlo, Consolas, monospace;
  --focus: 0 0 0 3px rgba(91, 140, 255, 0.55);
  --container: 720px;
  --brand: #7aa1ff;
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 50% -10%, #1a2740 0%, transparent 60%),
    var(--bg);
}

img,
video {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--accent);
}

code {
  font-family: var(--mono);
  font-size: 0.9em;
  color: var(--accent-hover);
}

.container {
  width: min(100% - 2rem, var(--container));
  margin-inline: auto;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Header / brand */

.site-header {
  padding: 2.25rem 0 1rem;
  text-align: center;
}

.brand {
  margin: 0 0 0.85rem;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: inherit;
  text-decoration: none;
}

.brand-link:hover .brand-name {
  color: var(--accent-hover);
}

.brand-link:focus-visible {
  outline: none;
  border-radius: 8px;
  box-shadow: var(--focus);
}

.brand-mark {
  width: 1.35rem;
  height: 1.35rem;
  border: 2px solid var(--accent);
  border-radius: 5px;
  background:
    linear-gradient(var(--accent) 0 0) 30% 38% / 22% 38% no-repeat,
    linear-gradient(var(--accent) 0 0) 62% 38% / 22% 38% no-repeat;
  box-shadow: inset 0 -0.28rem 0 -0.18rem var(--accent-hover);
}

.brand-name {
  font-size: clamp(1.75rem, 5vw, 2.35rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--brand);
  transition: color 0.15s ease;
}

.site-header h1 {
  margin: 0 0 0.4rem;
  font-size: clamp(1.15rem, 3vw, 1.45rem);
  font-weight: 650;
  letter-spacing: -0.02em;
}

.subtitle {
  margin: 0 auto;
  max-width: 28rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.footer-brand {
  color: var(--brand);
  font-weight: 700;
}

/* Hero */

.hero {
  margin: 1.5rem auto 2rem;
  padding: 2rem 1.5rem;
  text-align: center;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 4px);
  box-shadow: var(--shadow);
}

.hero-label {
  margin: 0 0 0.5rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.hero-resolution {
  margin: 0;
  font-size: clamp(2.4rem, 10vw, 4.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.hero-note {
  margin: 1rem auto 0;
  max-width: 36rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Sections */

.section-title {
  margin: 0 0 0.75rem;
  font-size: 1.25rem;
  font-weight: 650;
}

.section-lead {
  margin: 0 0 1.25rem;
  color: var(--text-muted);
}

.api-disclaimer {
  margin: 1.25rem 0 0;
  padding: 0.85rem 1rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  background: var(--bg-elevated);
  border-left: 3px solid var(--border);
  border-radius: 0 var(--radius) var(--radius) 0;
}

/* Metrics */

.metrics {
  margin-bottom: 2.5rem;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.75rem;
  margin: 0;
}

.metric-card {
  margin: 0;
  padding: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.metric-card dt {
  margin: 0 0 0.35rem;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 500;
}

.metric-card dd {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 650;
  font-variant-numeric: tabular-nums;
}

.metric-hint {
  margin: 0.4rem 0 0;
  color: var(--text-muted);
  font-size: 0.72rem;
  line-height: 1.35;
}

/* Video */

.video-section {
  margin-bottom: 3rem;
}

.source-mode {
  margin: 0 0 1.25rem;
  padding: 1rem 1.15rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.source-mode-title {
  margin: 0 0 0.4rem;
  font-size: 0.95rem;
}

.source-mode-hint {
  margin: 0 0 0.85rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.btn.is-active-mode {
  border-color: var(--warn);
  background: rgba(230, 184, 77, 0.15);
  color: var(--warn);
}

.quality-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.btn-quality.is-soft-fallback {
  opacity: 0.72;
}

.quality-warning {
  margin: 0 0 1rem;
  padding: 0.75rem 1rem;
  color: #2a2108;
  background: #e6b84d;
  border-radius: var(--radius);
  font-size: 0.9rem;
}

.player-shell {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  max-height: min(70vh, 720px);
  background: #000;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.player-shell video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #000;
}

.player-placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 1rem;
  color: var(--text-muted);
  text-align: center;
  pointer-events: none;
}

.player-actions {
  margin-top: 0.75rem;
}

.video-status {
  min-height: 1.5em;
  margin: 0.75rem 0 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.video-status[data-kind='ok'] {
  color: var(--ok);
}

.video-status[data-kind='loading'] {
  color: var(--accent-hover);
}

.video-status[data-kind='warn'] {
  color: var(--warn);
}

.video-status[data-kind='error'] {
  color: var(--error);
}

.video-error-action {
  margin: 0.5rem 0 0;
}

.playback-info {
  margin-top: 1.25rem;
  padding: 1rem 1.15rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.playback-title {
  margin: 0 0 0.75rem;
  font-size: 1rem;
  font-weight: 650;
}

.playback-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.75rem;
  margin: 0;
}

.playback-grid dt {
  margin: 0 0 0.2rem;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.playback-grid dd {
  margin: 0;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

/* Buttons */

.btn {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  min-height: 2.5rem;
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-card);
  color: var(--text);
  font: inherit;
  font-weight: 560;
  cursor: pointer;
  transition:
    background 0.15s ease,
    border-color 0.15s ease,
    color 0.15s ease;
}

.btn:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.btn:focus-visible {
  outline: none;
  box-shadow: var(--focus);
}

.btn-quality.is-active,
.btn-quality[aria-pressed='true'] {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.btn-quality.is-active:hover,
.btn-quality[aria-pressed='true']:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.btn-secondary {
  background: transparent;
}

/* Footer */

.site-footer {
  padding: 2rem 0 2.5rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.85rem;
  text-align: center;
}

.site-footer p {
  margin: 0;
}

/* Motion */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Narrow phones */

@media (max-width: 480px) {
  .container {
    width: min(100% - 1.25rem, var(--container));
  }

  .hero {
    padding: 1.5rem 1rem;
  }

  .quality-toolbar {
    gap: 0.4rem;
  }

  .btn-quality {
    flex: 1 1 calc(50% - 0.4rem);
    min-width: 0;
  }
}