:root {
  --bg: #fafafa;
  --fg: #1a1a1a;
  --muted: #6b7280;
  --accent: #0f766e;
  --accent-hover: #115e59;
  --border: #d4d4d8;
  --border-hover: #0f766e;
  --error: #b91c1c;
  --warn: #b45309;
  --card: #fff;
  --radius: 10px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  padding: 2rem 1rem;
}

main {
  width: min(720px, 100%);
}

header {
  margin-bottom: 1.5rem;
}

h1 {
  margin: 0 0 0.25rem;
  font-size: 1.5rem;
}

.sub {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

.status {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.drops {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1rem;
}

@media (max-width: 560px) {
  .drops { grid-template-columns: 1fr; }
}

.drop {
  background: var(--card);
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.drop:hover, .drop.over {
  border-color: var(--border-hover);
  background: #f0fdfa;
}

.drop input[type=file] {
  display: none;
}

.drop-title {
  font-weight: 600;
  font-size: 0.95rem;
}

.drop-hint {
  font-size: 0.8rem;
  color: var(--muted);
}

.drop-file {
  margin-top: 0.5rem;
  font-size: 0.85rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  color: var(--fg);
  word-break: break-all;
  min-height: 1.2em;
}

.drop-file:empty::before {
  content: attr(data-empty);
  color: var(--muted);
  font-style: italic;
}

.options {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.options label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  justify-content: space-between;
}

.options select {
  padding: 0.35rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card);
  font-size: 0.85rem;
}

button {
  width: 100%;
  padding: 0.85rem 1rem;
  font-size: 1rem;
  font-weight: 600;
  color: white;
  background: var(--accent);
  border: 0;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.15s;
}

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

button:disabled {
  background: #a1a1aa;
  cursor: not-allowed;
}

#result {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

#result.ok    { border-left: 4px solid var(--accent); }
#result.warn  { border-left: 4px solid var(--warn); }
#result.error { border-left: 4px solid var(--error); }

#result-banner h2 {
  margin: 0 0 0.25rem;
  font-size: 1.05rem;
  line-height: 1.3;
}

#result.ok    #result-banner h2 { color: var(--accent); }
#result.warn  #result-banner h2 { color: var(--warn); }
#result.error #result-banner h2 { color: var(--error); }

#result-banner p {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.45;
}

#result-breakdown {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.3rem 1rem;
  margin: 0;
  font-size: 0.88rem;
}

#result-breakdown:empty { display: none; }

#result-breakdown dt {
  color: var(--muted);
  font-weight: 500;
}

#result-breakdown dd {
  margin: 0;
  font-variant-numeric: tabular-nums;
}

#result-unplaced summary {
  cursor: pointer;
  font-size: 0.88rem;
  color: var(--accent);
  padding: 0.4rem 0;
}

#result-unplaced summary:hover { text-decoration: underline; }

#unplaced-list {
  margin: 0.4rem 0 0;
  padding: 0.6rem 0.9rem;
  list-style: none;
  background: #fafafa;
  border: 1px solid var(--border);
  border-radius: 6px;
  max-height: 280px;
  overflow-y: auto;
  font-size: 0.82rem;
  line-height: 1.6;
}

#unplaced-list li { margin: 0; word-break: break-all; }
#unplaced-list code {
  background: #fff;
  padding: 1px 5px;
  border: 1px solid var(--border);
  border-radius: 3px;
  font-size: 0.78rem;
}

#result-error {
  margin: 0;
  padding: 0.7rem 0.9rem;
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: 6px;
  color: var(--error);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.82rem;
  white-space: pre-wrap;
  word-break: break-word;
}

#reset {
  align-self: flex-start;
  width: auto;
  padding: 0.5rem 0.85rem;
  font-size: 0.85rem;
  font-weight: 500;
  background: var(--card);
  color: var(--fg);
  border: 1px solid var(--border);
}

#reset:hover { background: #f4f4f5; }

footer {
  margin-top: 2rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.8rem;
}

footer a { color: var(--muted); }