/* ── Design tokens ─────────────────────────────────────────────────────────── */
:root {
  --bg:         #0d1117;
  --surface:    #161b22;
  --surface-2:  #21262d;
  --border:     #30363d;
  --text:       #e6edf3;
  --text-muted: #8b949e;
  --accent:     #58a6ff;
  --accent-dim: #1f3a5f;
  --success:    #3fb950;
  --danger:     #f85149;
  --warning:    #d29922;
  --radius:     8px;
  --gap:        16px;
}

/* ── Reset ─────────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 14px;
  line-height: 1.6;
  min-height: 100dvh;
}

/* ── Typography ────────────────────────────────────────────────────────────── */
h2 {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 12px;
}

label {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 4px;
}

/* ── Form controls ─────────────────────────────────────────────────────────── */
input[type="text"],
input[type="number"],
select,
textarea {
  width: 100%;
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 7px 10px;
  font-size: 13px;
  font-family: inherit;
  outline: none;
  transition: border-color .15s;
}
input[type="text"]:focus,
input[type="number"]:focus,
select:focus,
textarea:focus {
  border-color: var(--accent);
}
select { cursor: pointer; }
textarea { resize: vertical; min-height: 60px; }

input[type="color"] {
  width: 36px;
  height: 36px;
  padding: 2px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  flex-shrink: 0;
}

/* ── Buttons ───────────────────────────────────────────────────────────────── */
button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  font-size: 13px;
  font-family: inherit;
  font-weight: 500;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background .15s, border-color .15s, opacity .15s;
  white-space: nowrap;
}
button:active { opacity: .75; }
button:disabled { opacity: .4; cursor: not-allowed; }

.btn-primary {
  background: var(--accent);
  color: #000;
  border-color: var(--accent);
}
.btn-primary:hover:not(:disabled) { background: #79b8ff; border-color: #79b8ff; }

.btn-secondary {
  background: var(--surface-2);
  color: var(--text);
  border-color: var(--border);
}
.btn-secondary:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }

.btn-danger {
  background: transparent;
  color: var(--danger);
  border-color: var(--danger);
}
.btn-danger:hover:not(:disabled) { background: var(--danger); color: #fff; }

.btn-sm {
  padding: 4px 10px;
  font-size: 12px;
}

/* ── Layout ────────────────────────────────────────────────────────────────── */
#app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: var(--gap);
  padding: 12px 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

#app-header h1 {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .04em;
  flex: 1;
}

#dirty-badge {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 20px;
  background: var(--warning);
  color: #000;
  font-weight: 600;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

#loading {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100dvh;
  color: var(--text-muted);
  font-size: 14px;
}

/* ── Cards / sections ──────────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}

/* ── Connection row ────────────────────────────────────────────────────────── */
#connection .fields {
  display: flex;
  gap: var(--gap);
  flex-wrap: wrap;
}
#connection .field { flex: 1; min-width: 160px; }

/* ── Global LEDs ───────────────────────────────────────────────────────────── */
#global-leds .fields {
  display: flex;
  gap: var(--gap);
  align-items: flex-end;
  flex-wrap: wrap;
}
#global-leds .field { flex: 1; min-width: 120px; }

.color-row {
  display: flex;
  align-items: center;
  gap: 8px;
}
.color-hex {
  font-size: 12px;
  color: var(--text-muted);
  font-family: monospace;
}

.led-preview {
  margin-top: 12px;
  height: 8px;
  border-radius: 4px;
}

/* ── Knobs / Buttons grids ─────────────────────────────────────────────────── */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--gap);
}

.knob-card,
.button-card {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.knob-card .card-title,
.button-card .card-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent-dim);
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
}

/* ── LED override toggle ───────────────────────────────────────────────────── */
.led-override-toggle {
  font-size: 11px;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  user-select: none;
  background: none;
  border: none;
  padding: 0;
  font-family: inherit;
}
.led-override-toggle:hover { color: var(--accent); }

.led-override-panel {
  display: none;
  flex-direction: column;
  gap: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--border);
}
.led-override-panel.open { display: flex; }

.led-override-panel .color-row { flex-wrap: wrap; gap: 6px; }

/* ── Presets ───────────────────────────────────────────────────────────────── */
#presets .save-row {
  display: flex;
  gap: var(--gap);
  align-items: flex-end;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
#presets .save-row .field { flex: 1; min-width: 180px; }

.preset-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.preset-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.preset-item .preset-name {
  flex: 1;
  font-weight: 500;
  font-size: 13px;
}
.preset-item .preset-actions { display: flex; gap: 6px; }

/* ── Toast notifications ───────────────────────────────────────────────────── */
#toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 9999;
  pointer-events: none;
}

.toast {
  padding: 10px 16px;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 500;
  color: #fff;
  animation: toast-in .2s ease, toast-out .3s ease 2.7s forwards;
  pointer-events: auto;
}
.toast.success { background: var(--success); color: #000; }
.toast.error   { background: var(--danger); }
.toast.info    { background: var(--accent); color: #000; }

@keyframes toast-in  { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
@keyframes toast-out { from { opacity: 1; } to { opacity: 0; } }

/* ── Empty state ───────────────────────────────────────────────────────────── */
.empty {
  text-align: center;
  padding: 24px;
  color: var(--text-muted);
  font-size: 13px;
}

/* ── Responsive ────────────────────────────────────────────────────────────── */
@media (max-width: 540px) {
  main { padding: 16px; }
  #app-header { padding: 10px 16px; }
}