:root {
  --bg: #0a0a10;
  --surface: #141420;
  --surface-hover: #1a1a2a;
  --border: #252540;
  --border-light: #333358;
  --text: #e4e4f0;
  --text-muted: #7a7a90;
  --accent: #6366f1;
  --accent-glow: rgba(99, 102, 241, 0.3);
  --danger: #ef4444;
  --success: #22c55e;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-xs: 6px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --transition: 150ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  max-width: 780px;
  margin: 0 auto;
  padding: 0 16px;
}

/* ── Header ── */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
  gap: 12px;
  flex-shrink: 0;
}

header h1 {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.3px;
}

.page-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.page-nav .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
  cursor: pointer;
  transition: background var(--transition);
}
.page-nav .dot:hover { background: var(--text-muted); }
.page-nav .dot.active { background: var(--accent); box-shadow: 0 0 8px var(--accent-glow); }

.header-actions {
  display: flex;
  gap: 8px;
}

.icon-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-muted);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition);
  font-size: 14px;
}
.icon-btn:hover {
  background: var(--surface-hover);
  border-color: var(--border-light);
  color: var(--text);
}

/* ── Grid ── */
main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
}

.deck-grid {
  display: grid;
  gap: 8px;
  padding: 20px;
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  width: 100%;
  max-width: 525px;
  contain: layout style;
}

.deck-selector {
  display: flex;
  gap: 4px;
  margin-bottom: 8px;
  align-self: stretch;
}
.deck-btn {
  flex: 1;
  padding: 6px 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
}
.deck-btn:hover { color: var(--text); border-color: var(--border-light); }
.deck-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.key-btn {
  aspect-ratio: 1;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: #0d0d18;
  cursor: pointer;
  overflow: hidden;
  position: relative;
  transition: all var(--transition);
  padding: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-width: 0;
  min-height: 0;
}

.key-btn:hover {
  border-color: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
  transform: scale(1.03);
}

.key-btn:active { transform: scale(0.97); }

.key-btn img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.key-btn.empty {
  border-color: var(--border-light);
}
.key-btn.empty:hover {
  opacity: 0.5;
  border-color: var(--border-light);
  box-shadow: none;
}

.key-label {
  position: absolute;
  bottom: 3px;
  left: 4px;
  right: 4px;
  font-size: 9px;
  color: rgba(255, 255, 255, 0.75);
  text-align: center;
  text-shadow: 0 1px 2px rgba(0,0,0,0.8);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  pointer-events: none;
  line-height: 1;
}

.fa-preview {
  font-size: 34px;
  color: #fff;
}

/* ── Modal ── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn 150ms ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  width: 360px;
  max-width: calc(100vw - 32px);
  box-shadow: var(--shadow);
  animation: slideUp 200ms cubic-bezier(0.16, 1, 0.3, 1);
  max-height: 85vh;
  overflow-y: auto;
}

@keyframes slideUp {
  from { transform: translateY(16px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.modal h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 16px;
  letter-spacing: -0.2px;
}

.preview-box {
  width: 100px;
  height: 100px;
  margin: 0 auto 16px;
  border-radius: var(--radius-xs);
  overflow: hidden;
  border: 1px solid var(--border);
  position: relative;
  background: #0d0d18;
  cursor: pointer;
}

.preview-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.preview-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.5);
  opacity: 0;
  transition: opacity var(--transition);
  border-radius: var(--radius-xs);
}

.preview-box:hover .preview-overlay { opacity: 1; }

.preview-overlay i {
  font-size: 24px;
  color: #fff;
}

.form-group {
  margin-bottom: 12px;
}

.form-group label {
  display: block;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 8px 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  color: var(--text);
  font-size: 13px;
  font-family: inherit;
  outline: none;
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

.form-group input::placeholder {
  color: var(--text-muted);
  opacity: 0.5;
}

.form-group select {
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M3 5l3 3 3-3' fill='none' stroke='%237a7a90' stroke-width='1.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 28px;
}

.form-row {
  display: flex;
  gap: 8px;
}

.form-row .form-group { flex: 1; }

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.checkbox-row input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
}

.checkbox-row label {
  font-size: 13px;
  color: var(--text);
  cursor: pointer;
}

/* Collapsible */
.collapse-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 4px 0;
  margin-bottom: 8px;
  font-family: inherit;
}

.collapse-toggle:hover { color: var(--accent); }
.collapse-toggle i { font-size: 10px; transition: transform var(--transition); }
.collapse-toggle.open i { transform: rotate(90deg); }

.modal-actions {
  display: flex;
  gap: 8px;
  margin-top: 20px;
}

.btn {
  padding: 8px 16px;
  border-radius: var(--radius-xs);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  border: 1px solid transparent;
  transition: all var(--transition);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  flex: 1;
}

.btn-primary:hover {
  background: #4f46e5;
  box-shadow: 0 0 16px var(--accent-glow);
}

.btn-outline {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}

.btn-outline:hover {
  background: var(--surface-hover);
  border-color: var(--border-light);
}

.btn-danger {
  color: var(--danger);
  border-color: transparent;
  background: transparent;
}

.btn-danger:hover {
  background: rgba(239, 68, 68, 0.12);
  border-color: rgba(239, 68, 68, 0.3);
}

/* ── Settings / Backup panels ── */
.panel {
  width: 100%;
  padding: 20px;
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.panel h3 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 16px;
}

.panel-section {
  margin-bottom: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

.panel-section:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.panel-section h4 {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}

.backup-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 12px;
}

.backup-item:last-child { border-bottom: none; }

.backup-item .meta {
  color: var(--text-muted);
  font-size: 11px;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: var(--bg);
  border-radius: 20px;
  font-size: 12px;
  border: 1px solid var(--border);
}

.status-badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

.status-badge .dot.online { background: var(--success); }
.status-badge .dot.offline { background: var(--text-muted); }

/* ── Toasts ── */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 12px 24px;
  border-radius: var(--radius);
  font-size: 13px;
  z-index: 200;
  box-shadow: var(--shadow);
  animation: slideUp 200ms cubic-bezier(0.16, 1, 0.3, 1);
}

.toast.success { border-color: var(--success); }
.toast.error { border-color: var(--danger); }

.slider-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.slider-group input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  border-radius: 2px;
  background: var(--border);
  outline: none;
}

.slider-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid var(--bg);
}

.slider-group .value {
  font-size: 12px;
  color: var(--text-muted);
  min-width: 36px;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* ── Toolbar ── */
.toolbar {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
  flex-shrink: 0;
}

.toolbar .btn {
  font-size: 12px;
  padding: 6px 14px;
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-light); }

/* ── Auto-switch rule item ── */
.rule-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  background: var(--bg);
  border-radius: var(--radius-xs);
  margin-bottom: 6px;
  font-size: 12px;
}

.rule-item code {
  background: var(--surface);
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 11px;
  color: var(--accent);
}

/* ── Indicators on grid keys ── */
.display-indicator {
  position: absolute;
  bottom: 4px;
  right: 4px;
  font-size: 7px;
  color: var(--accent);
  opacity: 0.6;
  pointer-events: none;
}

.action-icons {
  position: absolute;
  top: 4px;
  left: 4px;
  display: flex;
  gap: 3px;
  pointer-events: none;
  flex-wrap: wrap;
  max-width: calc(100% - 6px);
}
.action-icon {
  font-size: 7px;
  color: var(--accent);
  opacity: 0.6;
  line-height: 1;
}

/* ── Tab buttons ── */
.tab-row {
  display: flex;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  overflow: hidden;
}

.tab-btn {
  flex: 1;
  padding: 6px 8px;
  background: var(--bg);
  border: none;
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition);
  border-right: 1px solid var(--border);
}

.tab-btn:last-child { border-right: none; }
.tab-btn:hover { color: var(--text); }
.tab-btn.active {
  background: var(--accent);
  color: #fff;
}

/* ── Modifier buttons ── */
.mod-row {
  display: flex;
  gap: 4px;
  margin-bottom: 8px;
}
.mod-btn {
  flex: 1;
  padding: 6px 8px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
}
.mod-btn:hover { color: var(--text); border-color: var(--border-light); }
.mod-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* ── Key capture ── */
.key-capture {
  border: 1px dashed var(--border);
  border-radius: var(--radius-xs);
  padding: 8px;
  min-height: 34px;
  cursor: pointer;
  text-align: center;
  transition: all var(--transition);
  outline: none;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
}
.key-capture:hover { border-color: var(--accent); }
.key-capture:focus-visible { border-color: var(--accent); }
.key-capture.capturing {
  border-color: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
  animation: recorderPulse 1s infinite;
}
.captured-key {
  font-weight: 600;
  font-family: 'SF Mono', 'Fira Code', monospace;
  color: var(--accent);
  font-size: 13px;
}
.capture-hint { color: var(--accent); font-weight: 600; }
.capture-placeholder { color: var(--text-muted); opacity: 0.6; }

@keyframes recorderPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}
.key-chips {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-wrap: wrap;
  justify-content: center;
}
.key-chip {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 8px;
  font-size: 12px;
  font-weight: 600;
  font-family: 'SF Mono', 'Fira Code', monospace;
  color: var(--accent);
}
.key-plus {
  color: var(--text-muted);
  font-size: 11px;
  margin: 0 2px;
}

/* ── Action tabs ── */
.action-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 10px;
}
.action-tab {
  flex: 1;
  padding: 5px 2px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  color: var(--text-muted);
  font-size: 9px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  text-align: center;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 3px;
  line-height: 1.3;
}
.action-tab:hover { color: var(--text); border-color: var(--border-light); }
.action-tab.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.action-tab.configured {
  border-color: var(--success);
  color: var(--success);
}
.action-tab.active.configured {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.tab-check { font-size: 8px; }

/* ── Hold sub-tabs ── */
.hold-subtabs {
  display: flex;
  gap: 4px;
  margin-bottom: 10px;
}
.hold-stab {
  flex: 1;
  padding: 4px 8px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  color: var(--text-muted);
  font-size: 10px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  text-align: center;
  transition: all var(--transition);
}
.hold-stab:hover { color: var(--text); border-color: var(--border-light); }
.hold-stab.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
