/* Keyboard Tester — Gadgetester diagnostics design system */
.kbt-shell {
  --kbt-text: #0f172a;
  --kbt-muted: #64748b;
  --kbt-surface: #ffffff;
  --kbt-surface-2: #f8fafc;
  --kbt-lavender: #eef2ff;
  --kbt-border: #e2e8f0;
  --kbt-primary: #0067ff;
  --kbt-primary-hover: #0057d8;
  --kbt-green: #16a34a;
  --kbt-green-bg: #dcfce7;
  --kbt-red: #dc2626;
  --kbt-red-bg: #fee2e2;

  max-width: 1200px;
  margin: 24px auto;
  color: var(--kbt-text);
  font-family: "Space Grotesk", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: transparent;
  background-image: none;
}

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

.kbt-head { margin: 0; }
.kbt-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; }
.kbt-head-group { display: flex; align-items: center; gap: 12px; }

.kbt-title {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(28px, 4vw, 38px);
  font-weight: 700;
  line-height: 1.15;
  margin: 0;
}

.kbt-chip {
  font-family: "JetBrains Mono", monospace;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--kbt-muted);
  background: var(--kbt-surface-2);
  border: 1px solid var(--kbt-border);
  border-radius: 8px;
  padding: 4px 10px;
}
.kbt-chip-live {
  color: var(--kbt-primary);
  background: var(--kbt-lavender);
  border-color: #c7d2fe;
}

.kbt-unsupported {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 16px;
  margin-bottom: 16px;
  border: 1px solid #fecaca;
  background: var(--kbt-red-bg);
  color: #991b1b;
  border-radius: 12px;
  font-size: 14px;
}
.kbt-unsupported[hidden] { display: none !important; }

/* Panels / cards */
.kbt-panel {
  background: var(--kbt-surface);
  border: 1px solid var(--kbt-border);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 24px;
}
.kbt-panel h3 {
  font-family: "Space Grotesk", sans-serif;
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 12px;
}

.kbt-panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}
.kbt-panel-head h3 { margin: 0; }

.kbt-stage-actions { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.kbt-progress {
  font-family: "JetBrains Mono", monospace;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--kbt-muted);
}

/* Buttons */
.kbt-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 44px;
  padding: 0 16px;
  font-family: "Space Grotesk", sans-serif;
  font-size: 14px;
  font-weight: 500;
  color: var(--kbt-text);
  background: var(--kbt-surface);
  border: 1px solid var(--kbt-border);
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}
.kbt-btn:hover:not(:disabled) { background: var(--kbt-surface-2); border-color: #cbd5e1; color: var(--kbt-text); }
.kbt-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.kbt-btn .material-symbols-outlined { font-size: 18px; }
.kbt-btn-utility { font-size: 12px; }

.kbt-diag-actions { margin-top: 12px; }
.kbt-log-actions,
.kbt-stage-actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* Test stage */
.kbt-stage {
  position: relative;
  border: 1px solid var(--kbt-border);
  border-radius: 12px;
  background: var(--kbt-surface-2);
  padding: 16px;
  overflow-x: auto;
  outline: none;
}
.kbt-stage:focus-visible { border-color: var(--kbt-primary); box-shadow: 0 0 0 3px rgba(0, 103, 255, 0.15); }

.kbt-stage-empty {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-align: center;
  padding: 16px;
  background: rgba(248, 250, 252, 0.92);
  border-radius: 12px;
  z-index: 2;
}
.kbt-stage-empty .material-symbols-outlined { font-size: 40px; color: var(--kbt-muted); }
.kbt-stage-empty p { margin: 0; font-size: 16px; font-weight: 500; }
.kbt-stage-hint { font-size: 13px; color: var(--kbt-muted); max-width: 460px; }

/* Keyboard */
.kbt-clusters {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  min-width: 900px;
}
.kbt-block-main { flex: 1 1 auto; }
.kbt-block-nav { flex: 0 0 auto; }
.kbt-block-num { flex: 0 0 auto; }

.kbt-row { display: flex; gap: 6px; margin-bottom: 6px; }
.kbt-row:last-child { margin-bottom: 0; }
.kbt-spacer { pointer-events: none; }

.kbt-grid-block {
  display: grid;
  gap: 6px;
  grid-auto-rows: 40px;
}
.kbt-block-nav { width: 132px; }
.kbt-block-num { width: 176px; }

.kbt-key {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 4px;
  background: var(--kbt-surface);
  border: 1px solid #cbd5e1;
  border-bottom-width: 2px;
  border-radius: 8px;
  font-family: "JetBrains Mono", monospace;
  font-size: 12px;
  font-weight: 500;
  color: var(--kbt-text);
  user-select: none;
  overflow: hidden;
  transition: background 0.08s ease, color 0.08s ease, border-color 0.08s ease, transform 0.05s ease;
}
.kbt-key-label { white-space: nowrap; text-overflow: ellipsis; overflow: hidden; }

.kbt-key-tested {
  background: var(--kbt-green-bg);
  border-color: #86efac;
  color: #166534;
}
.kbt-key-down {
  background: var(--kbt-primary);
  border-color: var(--kbt-primary-hover);
  color: #f8fafc;
  transform: translateY(1px);
}
.kbt-key-stuck {
  background: var(--kbt-red-bg);
  border-color: #fca5a5;
  color: #991b1b;
  animation: kbt-pulse 0.8s ease-in-out infinite;
}
@keyframes kbt-pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.55; } }

/* Info grid */
.kbt-grid { display: grid; gap: 24px; }
.kbt-info-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.kbt-kv {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px 16px;
  align-items: center;
}
.kbt-kv span {
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--kbt-muted);
}
.kbt-kv strong {
  font-family: "JetBrains Mono", monospace;
  font-size: 13px;
  font-weight: 700;
  text-align: right;
  word-break: break-word;
}

.kbt-microlabel {
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--kbt-muted);
  margin: 16px 0 8px;
}

.kbt-inline-badges { display: flex; flex-wrap: wrap; gap: 8px; }
.kbt-badge {
  font-family: "JetBrains Mono", monospace;
  font-size: 12px;
  font-weight: 700;
  padding: 6px 12px;
  border-radius: 8px;
  background: var(--kbt-surface-2);
  border: 1px solid var(--kbt-border);
  color: var(--kbt-muted);
}
.kbt-badge-active {
  background: var(--kbt-primary);
  border-color: var(--kbt-primary-hover);
  color: #f8fafc;
}

/* Log */
.kbt-log-wrap { overflow-x: auto; max-height: 320px; overflow-y: auto; border: 1px solid var(--kbt-border); border-radius: 8px; }
.kbt-table { width: 100%; border-collapse: collapse; font-family: "JetBrains Mono", monospace; font-size: 12px; }
.kbt-table th {
  position: sticky;
  top: 0;
  text-align: left;
  background: var(--kbt-surface-2);
  color: var(--kbt-muted);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 8px 12px;
  border-bottom: 1px solid var(--kbt-border);
}
.kbt-table td { padding: 8px 12px; border-bottom: 1px solid #f1f5f9; }
.kbt-table tr:last-child td { border-bottom: none; }
.kbt-empty { text-align: center; color: var(--kbt-muted); padding: 24px 12px; }

.kbt-privacy { font-size: 12px; color: var(--kbt-muted); margin: 0; text-align: center; }

/* Responsive */
@media (max-width: 860px) {
  .kbt-info-grid { grid-template-columns: 1fr; }
}