/* ── Reset & base ──────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
[hidden] { display: none !important; }

:root {
  --bg:             oklch(9% 0.007 50);
  --surface:        oklch(14% 0.01 50);
  --surface-raised: oklch(19% 0.012 50);
  --border:         oklch(28% 0.014 50);
  --border-subtle:  oklch(22% 0.01 50);

  --text:           oklch(88% 0.005 50);
  --text-dim:       oklch(52% 0.01 50);
  --text-xdim:      oklch(38% 0.01 50);

  --accent:         oklch(62% 0.22 245);   /* blue — connect/action */
  --accent-glow:    oklch(62% 0.22 245 / 0.25);
  --success:        oklch(62% 0.22 145);   /* green — connected/saved */
  --success-glow:   oklch(62% 0.22 145 / 0.20);
  --amber:          oklch(72% 0.18 55);    /* amber — modified */
  --amber-glow:     oklch(72% 0.18 55 / 0.18);
  --error:          oklch(62% 0.22 25);    /* red — error/disconnect */

  --key-bg:         oklch(21% 0.013 50);
  --key-hover:      oklch(27% 0.018 50);
  --key-selected:   var(--accent);

  --radius-sm:  4px;
  --radius:     7px;
  --radius-lg:  12px;
  --gap:        5px;
}

html, body { height: 100%; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: 14px;
  min-height: 100vh;
}

/* ── App shell ─────────────────────────────────────────────────────────────── */
#app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  align-items: center;
}

/* ── Header ────────────────────────────────────────────────────────────────── */
#app-header {
  width: 100%;
  max-width: 960px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px 0;
}

.header-brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.brand-name {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--text);
}

.header-device {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--success);
  font-weight: 500;
}

.device-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 3px var(--success-glow);
}

/* ── Views ─────────────────────────────────────────────────────────────────── */
.view {
  width: 100%;
  max-width: 960px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* ── Connect card ──────────────────────────────────────────────────────────── */
#view-connect {
  align-items: center;
  justify-content: flex-start;
  padding: 40px 24px 60px;
  padding-top: max(40px, calc(50vh - 210px));
}

.connect-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  width: 100%;
  max-width: 400px;
  text-align: center;
}

.bt-icon {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  margin-bottom: 4px;
}

.connect-title {
  font-size: 1.3rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text);
}

.connect-sub {
  font-size: 0.85rem;
  color: var(--text-dim);
  line-height: 1.5;
  max-width: 320px;
}

/* ── Platform tip ──────────────────────────────────────────────────────────── */
.platform-tip {
  font-size: 0.8rem;
  padding: 10px 14px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-dim);
  text-align: left;
  line-height: 1.5;
  width: 100%;
}

.platform-tip.ok   { border-color: var(--success); color: oklch(75% 0.15 145); background: oklch(62% 0.22 145 / 0.07); }
.platform-tip.warn { border-color: var(--amber);   color: oklch(80% 0.14 55);  background: oklch(72% 0.18 55 / 0.07);  }
.platform-tip.err  { border-color: var(--error);   color: oklch(75% 0.15 25);  background: oklch(62% 0.22 25 / 0.07);  }

/* ── Buttons ───────────────────────────────────────────────────────────────── */
button { font-family: inherit; cursor: pointer; }
button:disabled { opacity: 0.38; cursor: not-allowed; }

.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  padding: 10px 22px;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: filter 0.14s, box-shadow 0.14s;
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-primary:hover:not(:disabled) {
  filter: brightness(1.12);
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-connect-cta {
  padding: 13px 32px;
  font-size: 1rem;
  border-radius: var(--radius-lg);
  box-shadow: 0 2px 16px var(--accent-glow);
  justify-content: center;
  width: 100%;
  max-width: 320px;
}

.btn-connect-cta:hover:not(:disabled) {
  box-shadow: 0 6px 28px var(--accent-glow);
}

.btn-connect-cta.loading {
  opacity: 0.7;
}

.btn-ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  border-radius: var(--radius);
  padding: 7px 14px;
  font-size: 0.84rem;
  font-weight: 500;
  transition: border-color 0.12s, color 0.12s, background 0.12s;
}

.btn-ghost:hover:not(:disabled) {
  border-color: var(--text-dim);
  color: var(--text);
  background: var(--surface-raised);
}

.text-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 0.82rem;
  padding: 2px 0;
  display: flex;
  align-items: center;
  gap: 5px;
  transition: color 0.12s;
}

.text-btn:hover { color: var(--text); }

.toggle-arrow {
  font-size: 0.7rem;
  transition: transform 0.18s;
  display: inline-block;
}

.text-btn[aria-expanded="true"] .toggle-arrow {
  transform: rotate(180deg);
}

/* ── Spinner ───────────────────────────────────────────────────────────────── */
.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  flex-shrink: 0;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ── Pairing instructions ──────────────────────────────────────────────────── */
.pairing-instructions {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px 18px;
  text-align: left;
  width: 100%;
}

.pairing-steps {
  padding-left: 1.2em;
  display: flex;
  flex-direction: column;
  gap: 9px;
  font-size: 0.83rem;
  color: var(--text-dim);
  line-height: 1.55;
}

.pairing-steps strong { color: var(--text); }

kbd {
  display: inline-block;
  background: var(--surface-raised);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 0.78rem;
  font-family: 'Space Mono', monospace;
  color: var(--text);
  vertical-align: baseline;
}

.pairing-note {
  margin-top: 12px;
  font-size: 0.76rem;
  color: var(--text-xdim);
  padding-top: 10px;
  border-top: 1px solid var(--border-subtle);
}

/* ── Keyboard view ─────────────────────────────────────────────────────────── */
#view-keyboard {
  padding: 28px 24px 0;
  gap: 0;
}

.keyboard-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

/* ── Layer tabs ────────────────────────────────────────────────────────────── */
.layer-tabs {
  display: flex;
  gap: 2px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 3px;
}

.layer-tab {
  background: transparent;
  border: none;
  border-radius: calc(var(--radius) - 2px);
  padding: 6px 16px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-dim);
  transition: background 0.14s, color 0.14s;
  white-space: nowrap;
}

.layer-tab:hover:not(.active) {
  background: var(--surface-raised);
  color: var(--text);
}

.layer-tab.active {
  background: var(--surface-raised);
  color: var(--text);
}

/* ── Toolbar right ─────────────────────────────────────────────────────────── */
.toolbar-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.preset-group {
  display: flex;
  align-items: center;
  gap: 7px;
}

.preset-group label {
  font-size: 0.78rem;
  color: var(--text-xdim);
  white-space: nowrap;
}

select {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 5px 8px;
  font-size: 0.84rem;
  font-family: inherit;
  cursor: pointer;
  outline: none;
  transition: border-color 0.12s;
}

select:hover, select:focus { border-color: var(--text-dim); }

/* ── Keyboard wrapper ──────────────────────────────────────────────────────── */
.keyboard-scroll {
  overflow-x: auto;
  width: 100%;
}

.keyboard-wrapper {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px;
  display: inline-block;
  min-width: max-content;
}

#keyboard-grid {
  display: flex;
  flex-direction: column;
  gap: var(--gap);
}

.key-row {
  display: flex;
  gap: var(--gap);
}

/* ── Key cells ─────────────────────────────────────────────────────────────── */
.key-cell {
  background: var(--key-bg);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: 'Space Mono', monospace;
  font-size: 0.72rem;
  font-weight: 400;
  width: 64px;
  height: 50px;
  cursor: pointer;
  transition: background 0.1s, border-color 0.1s, transform 0.08s, box-shadow 0.1s;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  padding: 3px 5px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.key-cell:hover {
  background: var(--key-hover);
  border-color: var(--border);
}

.key-cell:active {
  transform: translateY(1px);
}

.key-cell.selected {
  background: var(--key-selected);
  border-color: var(--accent);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 3px 12px var(--accent-glow);
}

/* modified: amber dot top-right + amber border */
.key-cell.modified {
  border-color: var(--amber);
}

.key-cell.modified::after {
  content: '';
  position: absolute;
  top: 4px;
  right: 4px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 4px var(--amber-glow);
}

.key-cell.long-label { font-size: 0.6rem; }

/* ── Save bar ──────────────────────────────────────────────────────────────── */
.save-bar {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  padding: 14px 0 20px;
  flex-wrap: wrap;
}

.change-count {
  font-size: 0.8rem;
  color: var(--amber);
  font-weight: 500;
  margin-right: auto;
}

.save-bar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ── Save progress ─────────────────────────────────────────────────────────── */
.save-progress {
  width: 100%;
  height: 3px;
  background: var(--border-subtle);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 16px;
}

.save-progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  width: 0%;
  transition: width 0.25s ease;
}

/* ── Toast ─────────────────────────────────────────────────────────────────── */
.status-toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--surface-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 10px 20px;
  font-size: 0.85rem;
  font-weight: 500;
  white-space: nowrap;
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
  z-index: 200;
  animation: toast-in 0.2s ease;
}

@keyframes toast-in {
  from { opacity: 0; transform: translateX(-50%) translateY(8px); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}

.status-toast.ok    { color: var(--success); border-color: oklch(62% 0.22 145 / 0.4); }
.status-toast.error { color: var(--error);   border-color: oklch(62% 0.22 25 / 0.4);  }
.status-toast.info  { color: var(--text-dim); }

/* ── Key picker modal ──────────────────────────────────────────────────────── */
#picker-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.65);
  backdrop-filter: blur(3px);
  z-index: 100;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

#picker-overlay.open { display: flex; }

.picker-modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 640px;
  max-height: 82vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 24px 64px rgba(0,0,0,0.6);
}

.picker-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 16px;
  border-bottom: 1px solid var(--border-subtle);
  flex-shrink: 0;
}

.picker-info {
  display: flex;
  flex-direction: column;
  gap: 1px;
  flex-shrink: 0;
  min-width: 0;
}

.picker-context {
  font-size: 0.72rem;
  color: var(--text-xdim);
  white-space: nowrap;
}

.picker-current {
  font-size: 0.82rem;
  color: var(--text-dim);
  font-family: 'Space Mono', monospace;
  white-space: nowrap;
}

#picker-search {
  flex: 1;
  background: var(--key-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: inherit;
  font-size: 0.85rem;
  padding: 6px 11px;
  outline: none;
  transition: border-color 0.12s;
  min-width: 0;
}

#picker-search:focus { border-color: var(--accent); }
#picker-search::placeholder { color: var(--text-xdim); }

.picker-close-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 1.1rem;
  padding: 4px 8px;
  line-height: 1;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  transition: color 0.12s, background 0.12s;
}

.picker-close-btn:hover {
  color: var(--text);
  background: var(--surface-raised);
}

#picker-groups {
  overflow-y: auto;
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

#picker-groups::-webkit-scrollbar { width: 6px; }
#picker-groups::-webkit-scrollbar-track { background: transparent; }
#picker-groups::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

.picker-group-label {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--text-xdim);
  margin-bottom: 7px;
}

.picker-keys {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.picker-key {
  background: var(--key-bg);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: 'Space Mono', monospace;
  font-size: 0.76rem;
  padding: 5px 10px;
  min-width: 38px;
  text-align: center;
  transition: background 0.1s, border-color 0.1s;
}

.picker-key:hover { background: var(--key-hover); border-color: var(--border); }

.picker-key.current {
  background: oklch(62% 0.22 245 / 0.15);
  border-color: var(--accent);
  color: var(--accent);
}

#picker-no-results {
  font-size: 0.84rem;
  color: var(--text-xdim);
  text-align: center;
  padding: 24px 0;
}