*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface-hover: #22252f;
  --border: #2a2d3a;
  --text: #e4e4e7;
  --text-muted: #71717a;
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --success: #22c55e;
  --danger: #ef4444;
  --radius: 8px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  padding: 2rem 1rem;
}

.container {
  width: 100%;
  max-width: 600px;
}

header {
  text-align: center;
  margin-bottom: 2rem;
}

h1 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

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

.about-link {
  display: inline-block;
  margin-top: 0.5rem;
  color: var(--primary);
  text-decoration: none;
  font-size: 0.8rem;
}

.about-link:hover {
  text-decoration: underline;
}

/* Drop Zone */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 3rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.drop-zone:hover,
.drop-zone.drag-over {
  border-color: var(--primary);
  background: rgba(59, 130, 246, 0.05);
}

.upload-icon {
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.drop-zone-content p {
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.drop-zone-or {
  display: block;
  color: var(--text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

.file-input-label {
  display: inline-block;
  padding: 0.5rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.875rem;
  color: var(--text);
  cursor: pointer;
  transition: background 0.2s;
}

.file-input-label:hover {
  background: var(--surface-hover);
}

/* File Info */
.file-info {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.file-info-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.file-info-header h2 {
  font-size: 1rem;
  font-weight: 500;
  word-break: break-all;
}

.btn-clear {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0 0.25rem;
  line-height: 1;
}

.btn-clear:hover {
  color: var(--danger);
}

/* Stats */
.file-stats {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.stat {
  flex: 1;
  background: var(--bg);
  border-radius: var(--radius);
  padding: 0.75rem;
  text-align: center;
}

.stat-label {
  display: block;
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.stat-value {
  font-size: 0.9rem;
  font-weight: 600;
}

/* Options */
.options {
  margin-bottom: 1.25rem;
}

.options h3 {
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.options-note {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.options-placeholder {
  background: var(--bg);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
}

.options-placeholder p {
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* Buttons */
.actions {
  display: flex;
  gap: 0.75rem;
}

.btn {
  flex: 1;
  padding: 0.7rem 1.25rem;
  border: none;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s;
}

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

.btn-primary:hover {
  background: var(--primary-hover);
}

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

.btn-secondary:hover {
  background: var(--border);
}

/* Result */
.result {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.result h3 {
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 1rem;
  color: var(--success);
}

/* Utilities */
.hidden {
  display: none !important;
}

/* Footer */
footer {
  text-align: center;
  margin-top: 2rem;
}

footer p {
  font-size: 0.75rem;
  color: var(--text-muted);
}