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

:root {
  --bg:         #1a1a1e;
  --bg2:        #24242a;
  --bg3:        #2e2e36;
  --border:     #3a3a45;
  --accent:     #5b8cff;
  --accent2:    #3e6fe0;
  --text:       #e0e0eb;
  --text-dim:   #888;
  --error:      #e05050;
  --ok:         #50c878;
  --warn:       #d4a040;
  --radius:     8px;
  --sidebar-w:  280px;
  --header-h:   48px;
  --font:       "Inter", "Segoe UI", system-ui, sans-serif;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ── Header ──────────────────────────────────────────────────────────────── */
header {
  height: var(--header-h);
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 16px;
  flex-shrink: 0;
}

header h1 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.04em;
}

#status-bar {
  font-size: 0.82rem;
  color: var(--text-dim);
  flex: 1;
}
#status-bar.busy  { color: var(--warn); }
#status-bar.done  { color: var(--ok); }
#status-bar.error { color: var(--error); }

/* ── Layout ──────────────────────────────────────────────────────────────── */
main {
  flex: 1;
  display: flex;
  overflow: hidden;
}

/* ── Sidebar ─────────────────────────────────────────────────────────────── */
#sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: var(--bg2);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.panel {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 12px;
}

.panel h2 {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.panel.collapsible h2.toggle {
  cursor: pointer;
  user-select: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0;
}
.panel.collapsible h2.toggle:hover { color: var(--text); }

.panel-body { margin-top: 8px; display: flex; flex-direction: column; gap: 8px; }
.panel-body.hidden { display: none; }

/* ── Form elements ───────────────────────────────────────────────────────── */
label { display: flex; flex-direction: column; gap: 4px; font-size: 0.8rem; color: var(--text-dim); }

input[type="file"] {
  font-size: 0.78rem;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 4px 6px;
  cursor: pointer;
}
input[type="file"]::-webkit-file-upload-button,
input[type="file"]::file-selector-button {
  background: var(--bg3);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 3px 8px;
  cursor: pointer;
  font-size: 0.76rem;
}

input[type="text"],
input[type="number"] {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 5px 8px;
  font-size: 0.82rem;
  width: 100%;
}
input[type="text"]:focus,
input[type="number"]:focus {
  outline: none;
  border-color: var(--accent);
}

.radio-group { display: flex; gap: 16px; }
.radio-group label { flex-direction: row; align-items: center; gap: 5px; color: var(--text); }

.checkbox-label { flex-direction: row !important; align-items: center; gap: 6px; color: var(--text) !important; }

.file-label { color: var(--text-dim); }

.row-buttons { display: flex; gap: 6px; }

/* ── Buttons ─────────────────────────────────────────────────────────────── */
button {
  font-family: var(--font);
  font-size: 0.82rem;
  font-weight: 600;
  border: none;
  border-radius: 5px;
  padding: 6px 12px;
  cursor: pointer;
  transition: background 0.15s;
}
button:disabled { opacity: 0.4; cursor: not-allowed; }

button.primary {
  background: var(--accent);
  color: #fff;
  width: 100%;
  padding: 8px;
  font-size: 0.9rem;
}
button.primary:not(:disabled):hover { background: var(--accent2); }

button.secondary {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
}
button.secondary:not(:disabled):hover { border-color: var(--accent); color: var(--accent); }

button.small { padding: 3px 8px; font-size: 0.75rem; }

.hint { font-size: 0.74rem; color: var(--text-dim); }

.hidden { display: none !important; }

/* ── Canvas / image area ─────────────────────────────────────────────────── */
#canvas-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 12px;
}

#image-panels {
  display: flex;
  gap: 12px;
  flex: 1;
  overflow: hidden;
}

.image-panel {
  flex: 1;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  font-size: 0.82rem;
  font-weight: 600;
  flex-shrink: 0;
}

.panel-footer {
  padding: 4px 12px;
  font-size: 0.75rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
  min-height: 24px;
  flex-shrink: 0;
}

.checkbox-small {
  font-size: 0.78rem;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 5px;
  font-weight: 400;
}

.image-frame {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: auto;
  padding: 8px;
  background: #111;
}

.placeholder-text {
  color: var(--text-dim);
  font-size: 0.85rem;
  text-align: center;
}

#canvas-source {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

#result-img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

/* ── Info / warn boxes ───────────────────────────────────────────────────── */
.info-box {
  background: rgba(91,140,255,0.1);
  border: 1px solid var(--accent);
  border-radius: 4px;
  padding: 6px 8px;
  line-height: 1.4;
  color: var(--text);
}

.warn-box {
  background: rgba(212,160,64,0.12);
  border: 1px solid var(--warn);
  border-radius: 4px;
  padding: 6px 8px;
  line-height: 1.4;
  color: var(--text);
}

/* ── Detect status ───────────────────────────────────────────────────────── */
#detect-status {
  font-size: 0.76rem;
  color: var(--ok);
  padding: 4px 0;
}

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

/* ── Responsive: narrow screens ──────────────────────────────────────────── */
@media (max-width: 700px) {
  main { flex-direction: column; }
  #sidebar { width: 100%; max-height: 50vh; border-right: none; border-bottom: 1px solid var(--border); }
  #image-panels { flex-direction: column; }
}