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

/* Base */
body {
  font-family: 'Inter', sans-serif;
  background: #0b0f19;
  color: #e5e7eb;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

/* Container */
.container {
  max-width: 750px;
  width: 100%;
}

/* Title */
h1 {
  font-size: 1.9rem;
  font-weight: 600;
  color: #f9fafb;
}

.subtitle {
  color: #94a3b8;
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

/* Steps */
.steps {
  display: flex;
  gap: 0.6rem;
  margin-bottom: 1.4rem;
}

.step {
  flex: 1;
  background: transparent;
  border: 1px solid #1f2937;
  padding: 1rem;
  border-radius: 10px;
  text-align: center;
  transition: all 0.2s ease;
}

.step:hover {
  border-color: #6366f1;
}

.step-num {
  font-size: 1.2rem;
  font-weight: 600;
}

.step-label {
  font-size: 0.75rem;
  color: #94a3b8;
  margin-top: 0.2rem;
}

/* Video */
.video-wrap {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 1.3rem;
  border: 1px solid #1f2937;
}

video {
  display: none;
}

canvas {
  width: 100%;
  display: block;
}

/* Recording badge */
.recording-badge {
  display: none;
  position: absolute;
  top: 12px;
  left: 12px;
  background: #ef4444;
  color: white;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 6px;
}

.recording-badge.active {
  display: block;
}

/* Sections */
.section {
  background: #111827;
  border: 1px solid #1f2937;
  border-radius: 12px;
  padding: 1.2rem;
  margin-bottom: 1.2rem;
}

.section-title {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #94a3b8;
  margin-bottom: 0.8rem;
}

/* Record buttons */
.rec-row {
  display: flex;
  gap: 0.8rem;
  margin-bottom: 0.75rem;
}

.rec-btn {
  flex: 1;
  padding: 0.8rem;
  border-radius: 8px;
  border: 1px solid #1f2937;
  background: #0f172a;
  color: #e5e7eb;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.rec-btn:hover {
  border-color: #6366f1;
  background: #111827;
}

.rec-btn:active,
.rec-btn.held {
  transform: scale(0.96);
}

/* Key badge */
.rec-btn .key {
  background: #1f2937;
  color: #cbd5f5;
  border-radius: 4px;
  padding: 2px 6px;
  font-size: 0.7rem;
}

/* Sample count */
.sample-counts {
  font-size: 0.8rem;
  color: #94a3b8;
}

.sample-counts span {
  color: #e5e7eb;
  font-weight: 600;
}

.session-count {
  color: #64748b;
  font-weight: 400;
}

.session-count span {
  color: #94a3b8;
  font-weight: 600;
}

.hint {
  font-size: 0.72rem;
  color: #64748b;
  margin-top: 0.5rem;
  line-height: 1.4;
}

/* Confidence */
.conf-bar-wrap {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.conf-bar {
  flex: 1;
  height: 8px;
  background: #1f2937;
  border-radius: 10px;
  overflow: hidden;
}

.conf-fill {
  height: 100%;
  width: 0%;
  background: #6366f1;
  transition: width 0.2s ease;
}

.conf-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: #6366f1;
}

/* Train button */
.train-btn {
  width: 100%;
  padding: 0.85rem;
  border: none;
  background: #6366f1;
  color: white;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.2s ease;
  margin-bottom: 0.75rem;
}

.train-btn:hover {
  background: #4f46e5;
}

.train-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* Status */
.status {
  font-size: 0.8rem;
  color: #94a3b8;
}

/* Utility buttons */
.util-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.util-btn {
  padding: 0.5rem 0.9rem;
  border-radius: 8px;
  border: 1px solid #1f2937;
  background: #0f172a;
  color: #e5e7eb;
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.util-btn:hover {
  border-color: #6366f1;
  background: #111827;
}

.util-btn.danger:hover {
  border-color: #ef4444;
  color: #ef4444;
}

/* Validation metrics */
.hidden {
  display: none;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.6rem;
  margin-bottom: 1rem;
}

.metric {
  background: #0f172a;
  border: 1px solid #1f2937;
  border-radius: 8px;
  padding: 0.7rem 0.4rem;
  text-align: center;
}

.metric-val {
  font-size: 1.15rem;
  font-weight: 700;
  color: #22c55e;
}

.metric-label {
  font-size: 0.65rem;
  color: #94a3b8;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-top: 0.25rem;
}

.confusion-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.75rem;
  margin-bottom: 0.7rem;
}

.confusion-table th,
.confusion-table td {
  border: 1px solid #1f2937;
  padding: 0.45rem;
  text-align: center;
  color: #e5e7eb;
  font-weight: 500;
}

.confusion-table thead th {
  color: #94a3b8;
  font-weight: 500;
  background: #0f172a;
}

.confusion-table tbody th {
  color: #94a3b8;
  background: #0f172a;
  text-align: left;
  padding-left: 0.6rem;
}

.metrics-note {
  font-size: 0.72rem;
  color: #64748b;
  line-height: 1.5;
}

@media (max-width: 480px) {
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}