:root {
  --bg: #0f172a;
  --panel: #1e293b;
  --border: #334155;
  --accent: #6366f1;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --warn: #fbbf24;
  --ok: #22c55e;
  --err: #ef4444;
  --diff: #fef3c7;
  --diff-text: #92400e;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
}

header {
  padding: 14px 24px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

header h1 {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 700;
}

#status-bar {
  font-size: 12px;
  color: var(--muted);
}

#status-bar.loading {
  color: var(--warn);
}

#status-bar.error {
  color: var(--err);
}

#status-bar.ok {
  color: var(--ok);
}

main {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(320px, 380px) 1fr;
  gap: 0;
  min-height: 0;
}

@media (max-width: 1024px) {
  main {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
  }
}

.panel {
  padding: 20px;
  border-right: 1px solid var(--border);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.panel-right {
  border-right: none;
  background: #0b1220;
}

.field label {
  display: block;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 6px;
  font-weight: 700;
}

select,
input[type='file'] {
  width: 100%;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #0f172a;
  color: var(--text);
  font-size: 14px;
}

.btn-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

button {
  padding: 10px 18px;
  border-radius: 8px;
  border: none;
  font-weight: 700;
  cursor: pointer;
  font-size: 13px;
}

button.primary {
  background: var(--accent);
  color: #fff;
}

button.secondary {
  background: #334155;
  color: var(--text);
}

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

.hint {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.5;
}

.excel-preview {
  font-family: ui-monospace, monospace;
  font-size: 11px;
  background: #0f172a;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  max-height: 120px;
  overflow: auto;
  white-space: pre-wrap;
}

.error-box {
  padding: 10px 12px;
  border-radius: 8px;
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid var(--err);
  color: #fecaca;
  font-size: 13px;
}

.success-box {
  padding: 10px 12px;
  border-radius: 8px;
  background: rgba(34, 197, 94, 0.12);
  border: 1px solid var(--ok);
  font-size: 13px;
}

.success-box a {
  color: #86efac;
}

.compare-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.compare-header h2 {
  margin: 0;
  font-size: 0.95rem;
}

.toggle-changed {
  font-size: 12px;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  min-height: 200px;
}

.compare-col h3 {
  margin: 0 0 8px;
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}

.compare-table th,
.compare-table td {
  border: 1px solid var(--border);
  padding: 8px 10px;
  vertical-align: top;
  text-align: left;
}

.compare-table th {
  background: var(--panel);
  color: var(--muted);
  width: 28%;
}

.compare-table td.changed {
  background: var(--diff);
  color: var(--diff-text);
}

.badge-changed {
  display: inline-block;
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--warn);
  color: #1e293b;
  margin-left: 6px;
}

.empty-compare {
  padding: 40px 20px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
}

#log-area {
  font-family: ui-monospace, monospace;
  font-size: 11px;
  color: var(--muted);
  border-top: 1px solid var(--border);
  padding-top: 12px;
  margin-top: auto;
}