*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  color-scheme: light dark;
  --bg: #f4f4f5;
  --surface: #ffffff;
  --text: #18181b;
  --text-muted: #71717a;
  --border: #e4e4e7;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-subtle: #eff6ff;
  --error-bg: #fef2f2;
  --error-text: #b91c1c;
  --success: #16a34a;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 4px 12px rgba(0, 0, 0, 0.04);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #09090b;
    --surface: #18181b;
    --text: #fafafa;
    --text-muted: #a1a1aa;
    --border: #27272a;
    --accent: #3b82f6;
    --accent-hover: #60a5fa;
    --accent-subtle: #172554;
    --error-bg: #450a0a;
    --error-text: #fca5a5;
  }
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.app {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

.header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.header h1 {
  margin: 0;
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.subtitle {
  margin: 0.25rem 0 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.privacy-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.65rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--success);
  background: color-mix(in srgb, var(--success) 12%, transparent);
  border-radius: 999px;
  white-space: nowrap;
  flex-shrink: 0;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
}

.card + .card {
  margin-top: 1.25rem;
}

.drop-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 2.5rem 1.5rem;
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  text-align: center;
}

.drop-zone:hover,
.drop-zone:focus-visible {
  border-color: var(--accent);
  background: var(--accent-subtle);
  outline: none;
}

.drop-zone.drag-over {
  border-color: var(--accent);
  background: var(--accent-subtle);
}

.drop-icon {
  color: var(--text-muted);
}

.drop-label {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.browse-link {
  color: var(--accent);
  font-weight: 500;
}

.file-name {
  margin: 0.25rem 0 0;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
  word-break: break-all;
}

.controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1.25rem;
}

@media (max-width: 480px) {
  .controls {
    grid-template-columns: 1fr;
  }
}

.control {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.control-label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
}

select {
  padding: 0.5rem 0.65rem;
  font: inherit;
  font-size: 0.9rem;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
}

select:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.btn {
  padding: 0.55rem 1.1rem;
  font: inherit;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: background 0.15s, opacity 0.15s;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

.btn-secondary {
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--border);
}

.btn-ghost {
  color: var(--accent);
  background: transparent;
  padding: 0.4rem 0.65rem;
  font-size: 0.85rem;
}

.btn-ghost:hover {
  background: var(--accent-subtle);
}

.status-panel {
  margin-top: 1.25rem;
}

.status-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 0.5rem;
}

.status-text {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.status-percent {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.progress-track {
  height: 6px;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
}

.progress-track.indeterminate .progress-bar {
  width: 40% !important;
  animation: progress-indeterminate 1.4s ease-in-out infinite;
}

@keyframes progress-indeterminate {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(350%); }
}

.progress-bar {
  height: 100%;
  background: var(--accent);
  border-radius: 999px;
  transition: width 0.25s ease;
}

.status-hint {
  margin: 0.5rem 0 0;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.error-panel {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  color: var(--error-text);
  background: var(--error-bg);
  border-radius: 8px;
}

.result-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.result-header h2 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
}

.export-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
}

.result-text {
  width: 100%;
  padding: 0.75rem;
  font: inherit;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  resize: vertical;
  min-height: 200px;
}

.result-text:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}