/* ============================================================
   WebCodecs Video Processor — Styles
   Theme: Modern dark-mode-first with vibrant accents
   ============================================================ */

:root {
  --c-bg: #0a0e1a;
  --c-surface: #111827;
  --c-surface-2: #1a2236;
  --c-border: #243049;
  --c-border-focus: #06b6d4;
  --c-primary: #06b6d4;
  --c-primary-dim: rgba(6, 182, 212, 0.12);
  --c-accent: #8b5cf6;
  --c-accent-dim: rgba(139, 92, 246, 0.12);
  --c-success: #22c55e;
  --c-danger: #ef4444;
  --c-warning: #f59e0b;
  --c-text: #e2e8f0;
  --c-text-dim: #94a3b8;
  --c-text-muted: #64748b;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-xs: 6px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --transition: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.5);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.6;
  min-height: 100vh;
  background-image:
    radial-gradient(ellipse at 30% 0%, rgba(6, 182, 212, 0.04) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 100%, rgba(139, 92, 246, 0.03) 0%, transparent 60%);
}

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--c-border); border-radius: 3px; }
::selection { background: var(--c-primary-dim); color: var(--c-primary); }
:focus-visible { outline: 2px solid var(--c-primary); outline-offset: 2px; }

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

/* ---------- Header ---------- */
#app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(17, 24, 39, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--c-border);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo-group { display: flex; align-items: center; gap: 0.75rem; }

.logo-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--c-primary-dim);
  color: var(--c-primary);
}

h1 {
  font-size: 1.2rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.api-badge {
  padding: 0.25rem 0.6rem;
  font-size: 0.6875rem;
  font-weight: 600;
  border-radius: var(--radius-xs);
  font-family: var(--font-mono);
}
.api-badge.supported { background: rgba(34, 197, 94, 0.15); color: var(--c-success); }
.api-badge.unsupported { background: rgba(239, 68, 68, 0.15); color: var(--c-danger); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  font-size: 0.8125rem;
  font-weight: 500;
  font-family: var(--font-sans);
  border: none;
  border-radius: var(--radius-xs);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-primary {
  background: linear-gradient(135deg, var(--c-primary), #0891b2);
  color: #0a0e1a;
  font-weight: 600;
}
.btn-primary:hover:not(:disabled) { filter: brightness(1.1); transform: translateY(-1px); box-shadow: 0 4px 16px rgba(6, 182, 212, 0.3); }

.btn-outline {
  background: transparent;
  color: var(--c-text-dim);
  border: 1px solid var(--c-border);
}
.btn-outline:hover:not(:disabled) { border-color: var(--c-primary); color: var(--c-primary); background: var(--c-primary-dim); }

/* ---------- Main ---------- */
#app-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* ---------- Panel Card ---------- */
.panel-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  transition: background var(--transition), border-color var(--transition);
}

.panel-card h2 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--c-text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

.panel-title-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}
.panel-title-row h2 { margin-bottom: 0; }

.hidden { display: none !important; }

/* ---------- Drop Zone ---------- */
.drop-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 2.5rem;
  border: 2px dashed var(--c-border);
  border-radius: var(--radius-sm);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  color: var(--c-text-dim);
}
.drop-zone:hover, .drop-zone.dragover {
  border-color: var(--c-primary);
  background: var(--c-primary-dim);
  color: var(--c-primary);
}
.drop-zone p { font-size: 0.875rem; }
.drop-zone strong { color: var(--c-primary); }
.drop-hint { font-size: 0.75rem; color: var(--c-text-muted); }

.file-info {
  margin-top: 0.75rem;
  padding: 0.5rem 0.75rem;
  background: var(--c-surface-2);
  border-radius: var(--radius-xs);
  font-size: 0.8125rem;
  color: var(--c-text-dim);
  font-family: var(--font-mono);
}

/* ---------- Video Grid ---------- */
.video-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

video, canvas {
  width: 100%;
  border-radius: var(--radius-sm);
  background: #000;
  display: block;
}

/* ---------- Controls ---------- */
.controls-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.control-group label {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--c-text-muted);
}

.num-input, .select-input {
  padding: 0.4rem 0.6rem;
  font-size: 0.8125rem;
  font-family: var(--font-sans);
  color: var(--c-text);
  background: var(--c-surface-2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-xs);
  transition: border-color var(--transition);
}
.num-input:focus, .select-input:focus { border-color: var(--c-primary); outline: none; }

.range-row { display: flex; align-items: center; gap: 0.5rem; }
.range-input { flex: 1; accent-color: var(--c-primary); }
.range-value { font-size: 0.75rem; font-family: var(--font-mono); color: var(--c-text-dim); min-width: 36px; }

.action-row {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.stat-badge {
  padding: 0.2rem 0.5rem;
  font-size: 0.6875rem;
  font-weight: 500;
  font-family: var(--font-mono);
  color: var(--c-text-muted);
  background: var(--c-surface-2);
  border-radius: var(--radius-xs);
}

/* ---------- Frame Inspector ---------- */
.frame-details {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 1rem;
  align-items: start;
}

#frame-canvas {
  width: 320px;
  height: 180px;
}

.frame-info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.info-item {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding: 0.5rem;
  background: var(--c-surface-2);
  border-radius: var(--radius-xs);
}

.info-label {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--c-text-muted);
}

.info-item span:last-child {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--c-text);
}

/* ---------- Metrics ---------- */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 0.75rem;
}

.metric-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1rem;
  background: var(--c-surface-2);
  border-radius: var(--radius-sm);
  border: 1px solid var(--c-border);
}

.metric-value {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--c-primary);
}

.metric-label {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--c-text-muted);
  margin-top: 0.25rem;
}

/* ---------- Progress ---------- */
.progress-bar {
  margin-top: 0.75rem;
  height: 6px;
  background: var(--c-surface-2);
  border-radius: 3px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--c-primary), var(--c-accent));
  border-radius: 3px;
  transition: width 100ms linear;
  width: 0%;
}

/* ---------- Toast ---------- */
#toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  z-index: 1000;
}

.toast {
  padding: 0.6rem 1rem;
  font-size: 0.8125rem;
  border-radius: var(--radius-sm);
  background: var(--c-surface-2);
  border: 1px solid var(--c-border);
  color: var(--c-text);
  box-shadow: var(--shadow);
  animation: toastIn 300ms ease;
  max-width: 320px;
}
.toast.success { border-color: rgba(34, 197, 94, 0.4); }
.toast.error { border-color: rgba(239, 68, 68, 0.4); }

@keyframes toastIn {
  from { opacity: 0; transform: translateY(12px) scale(0.95); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes toastOut {
  to { opacity: 0; transform: translateY(12px) scale(0.95); }
}

/* ---------- Responsive ---------- */
@media (max-width: 800px) {
  .video-grid { grid-template-columns: 1fr; }
  .frame-details { grid-template-columns: 1fr; }
  #frame-canvas { width: 100%; height: auto; }
  .controls-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .controls-grid { grid-template-columns: 1fr; }
  .metrics-grid { grid-template-columns: repeat(2, 1fr); }
  .header-inner { flex-direction: column; align-items: flex-start; }
}