:root {
  --bg: #e9ecef;
  --panel: #ffffff;
  --card: #f8f9fa;
  --text: #1a1a1a;
  --muted: #6c757d;
  --border: #ced4da;
  --primary: #0066cc;
  --primary-hover: #0052a3;
  --danger: #dc3545;
  --accent: #28a745;
  --shadow: 0 2px 8px rgba(0,0,0,0.1);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}.app-header { text-align: center; padding: 40px 16px 24px; }
.app-header h1 { margin: 0; font-weight: 600; font-size: 28px; color: var(--text); }
.app-header .subtitle { margin: 8px 0 0; color: var(--muted); font-size: 15px; }

.container { max-width: 960px; margin: 0 auto; padding: 24px 16px 48px; }

.picker { margin-bottom: 24px; }
.drop-zone {
  background: var(--panel);
  border: 2px dashed var(--border);
  border-radius: 8px;
  padding: 40px 28px;
  outline: none;
  transition: border-color 200ms ease, background 200ms ease;
}
.drop-zone:focus-visible { border-color: var(--primary); }
.drop-zone.dragover { border-color: var(--primary); background: #f0f7ff; }
.dz-inner { display: grid; justify-items: center; gap: 12px; }
.dz-icon { font-size: 32px; opacity: 0.7; }
.dz-title { font-weight: 500; margin: 0; font-size: 16px; }
.dz-hint { margin: 0; color: var(--muted); font-size: 14px; }.section-header { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.section-header h2 { margin: 0 0 16px; font-size: 17px; font-weight: 600; }

.file-list-section { background: var(--panel); border: 1px solid var(--border); border-radius: 8px; padding: 20px; box-shadow: var(--shadow); }
.empty-hint { margin: 12px 0 0; color: var(--muted); font-size: 14px; }

.file-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 6px; }
.file-item {
  display: grid;
  grid-template-columns: 28px 1fr auto 32px;
  align-items: center;
  gap: 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px 14px;
  transition: background 150ms ease;
}
.file-item:hover { background: #ffffff; }
.file-item.dragging { opacity: 0.5; border-style: dashed; }
.handle { cursor: grab; color: var(--muted); font-size: 16px; text-align: center; }
.name { font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 14px; }
.size { color: var(--muted); font-variant-numeric: tabular-nums; padding: 0 8px; font-size: 13px; }
.remove-btn { border: none; background: transparent; color: var(--muted); cursor: pointer; font-size: 20px; border-radius: 4px; padding: 4px 6px; transition: all 150ms ease; }
.remove-btn:hover { color: var(--danger); background: #ffe5e5; }.output-section { margin-top: 24px; background: var(--panel); border: 1px solid var(--border); border-radius: 8px; padding: 20px; box-shadow: var(--shadow); }
.row { display: flex; align-items: center; gap: 12px; margin: 8px 0; }
.row label { color: var(--text); min-width: 80px; font-weight: 500; font-size: 14px; }
.row input[type="text"] { flex: 1; background: var(--bg); color: var(--text); border: 1px solid var(--border); border-radius: 6px; padding: 10px 12px; font-size: 14px; transition: border-color 150ms ease; }
.row input[type="text"]:focus { outline: none; border-color: var(--primary); }

.btn { appearance: none; border: 1px solid var(--border); background: var(--panel); color: var(--text); padding: 10px 18px; border-radius: 6px; cursor: pointer; font-weight: 500; font-size: 14px; transition: all 150ms ease; }
.btn:hover { background: var(--bg); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: white; }
.btn.primary:hover:not(:disabled) { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn.secondary { background: var(--bg); }
.btn.ghost { background: transparent; border-color: transparent; color: var(--muted); }
.btn.ghost:hover { background: var(--bg); color: var(--text); }

.status { min-height: 20px; margin-top: 12px; color: var(--muted); font-size: 14px; }

.app-footer { text-align: center; color: var(--muted); padding: 32px 16px 48px; font-size: 13px; }

@media (max-width: 640px) {
	.file-item { grid-template-columns: 24px 1fr auto 28px; }
	.row { flex-direction: column; align-items: stretch; }
	.row label { min-width: 0; }
}