:root {
  --bg: #f4f7f2;
  --fg: #1f2a1f;
  --muted: #4d5b4d;
  --panel: #ffffff;
  --accent: #2c6e49;
  --accent-hover: #245a3c;
  --warn-bg: #ffecc9;
  --warn-fg: #5a3c00;
  --border: #d7dfd7;
  --led-on: #22c55e;
  --led-off: #9ca3af;
  --log-bg: #0f1a12;
  --log-fg: #eaf4eb;
}

[data-theme="dark"] {
  --bg: #0f1a12;
  --fg: #d4edda;
  --muted: #7dab89;
  --panel: #1a2e1f;
  --accent: #3d9e67;
  --accent-hover: #4cb87a;
  --warn-bg: #3a2a00;
  --warn-fg: #f5c842;
  --border: #2a4033;
  --log-bg: #0a1209;
  --log-fg: #c6e8cf;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--fg);
  transition: background 0.2s, color 0.2s;
}

/* Sticky top bar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  padding: 0.5rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

.topbar h1 {
  margin: 0;
  font-size: 1.1rem;
  flex: 1;
}

.led {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--led-off);
  flex-shrink: 0;
  transition: background 0.3s;
}

.led.on { background: var(--led-on); box-shadow: 0 0 6px var(--led-on); }

#topbar-target {
  font-size: 0.85rem;
  color: var(--muted);
}

.btn-icon {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--fg);
  padding: 0.3rem 0.6rem;
  font-size: 0.85rem;
}

.btn-icon:hover {
  background: var(--border);
}

.app {
  max-width: 920px;
  margin: 1rem auto;
  padding: 0 1rem 2rem;
}

h1 { margin-bottom: 0.25rem; }

.sub {
  color: var(--muted);
  margin-top: 0;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  margin-top: 1rem;
}

.row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  align-items: center;
}

.row + .row {
  margin-top: 0.75rem;
}

.button-row button {
  flex: 1;
  min-width: 0;
  text-align: center;
}

.confirm {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.75rem;
  color: var(--muted);
}

button {
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  padding: 0.5rem 0.85rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: background 0.15s;
  white-space: nowrap;
}

button:not([disabled]):hover {
  background: var(--accent-hover);
}

button[disabled] {
  opacity: 0.4;
  cursor: not-allowed;
}

label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--muted);
  white-space: nowrap;
}

select, input[type="text"], input[type="number"], input[type="file"] {
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--fg);
  padding: 0.45rem 0.6rem;
  border-radius: 8px;
  font-size: 0.9rem;
}

input[type="file"] {
  max-width: 11rem;
}

select:focus, input[type="text"]:focus, input[type="number"]:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.banner {
  margin-top: 1rem;
  background: var(--warn-bg);
  color: var(--warn-fg);
  border: 1px solid #e1c38a;
  border-radius: 8px;
  padding: 0.75rem;
}

.status {
  margin-top: 0.75rem;
  font-weight: 600;
}

/* Progress bar */
.progress-bar {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  margin-top: 0.5rem;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  transition: width 0.2s;
  width: 0%;
}

.log {
  min-height: 80px;
  margin: 0;
  background: var(--log-bg);
  color: var(--log-fg);
  padding: 0.75rem;
  border-radius: 8px;
  overflow: auto;
  font-size: 0.8rem;
  white-space: pre-wrap;
  word-break: break-all;
}

/* Collapsible event log */
.log-collapsed {
  max-height: 5.5em;
  overflow: hidden;
  cursor: pointer;
  position: relative;
}

.log-collapsed::after {
  content: "▼ click to expand";
  position: absolute;
  bottom: 0;
  right: 0;
  background: linear-gradient(transparent, var(--log-bg));
  padding: 0 0.5rem;
  font-size: 0.7rem;
  color: var(--muted);
}

.hint {
  color: var(--muted);
  font-size: 0.875rem;
  margin-top: 0;
  margin-bottom: 0.75rem;
}

/* Flex utilities */
.flex { display: flex; }
.flex-center { display: flex; align-items: center; }
.flex-col { display: flex; flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.gap-xs { gap: 0.25rem; }
.gap-sm { gap: 0.5rem; }
.gap-md { gap: 0.75rem; }
.gap-lg { gap: 1rem; }
.flex-shrink-0 { flex-shrink: 0; }
.flex-1 { flex: 1; }
.flex-grow { flex: 1; }

/* Size utilities */
.w-3 { width: 14px; }
.h-3 { height: 14px; }

/* Spacing utilities */
.rounded-sm { border-radius: 3px; }
.text-sm { font-size: 0.85rem; }
.text-xs { font-size: 0.75rem; }
.text-muted { color: #6b7280; }
.my-1 { margin: 0.25rem 0; }
.px-1 { padding-left: 0.2rem; padding-right: 0.2rem; }
.py-1 { padding-top: 0.2rem; padding-bottom: 0.2rem; }
.overflow-visible { overflow: visible; }

@media (max-width: 640px) {
  .app { padding: 0 0.5rem 2rem; margin-top: 0.5rem; }
  .row { gap: 0.5rem; }
  button { padding: 0.45rem 0.65rem; font-size: 0.8rem; }
  select, input[type="text"], input[type="number"] { font-size: 0.8rem; }
}

.progress-label {
  font-size: 0.8rem;
  color: var(--muted);
  margin: 0.25rem 0 0;
  font-variant-numeric: tabular-nums;
}

.tab-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem;
  margin-top: 1rem;
  padding: 0.3rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.tab-btn {
  flex: 0 0 auto;
  border: none;
  background: transparent;
  color: var(--muted);
  padding: 0.4rem 0.85rem;
  border-radius: 7px;
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 500;
  transition: background 0.12s, color 0.12s;
}

.tab-btn:hover {
  background: var(--bg);
  color: var(--fg);
}

.tab-btn.active {
  background: var(--accent);
  color: #fff;
}

.tab-panel {
  margin-top: 0.5rem;
}

.stub-msg {
  color: var(--muted);
  font-style: italic;
}

#event-log-panel {
  margin-top: 1.5rem;
}