:root {
  --bg: #1e1e2e;
  --panel: #313244;
  --panel-hover: #45475a;
  --border: #45475a;
  --text: #cdd6f4;
  --text-muted: #a6adc8;
  --accent: #89b4fa;
  --accent-soft: rgba(137, 180, 250, 0.12);
  --success: #a6e3a1;
  --success-hover: #94e2d5;
  --warning: #f9e2af;
  --danger: #f38ba8;
  --danger-soft: rgba(243, 139, 168, 0.12);
  --shadow: 0 18px 48px rgba(0, 0, 0, 0.35);
  --radius: 14px;
  --radius-sm: 10px;
  --font-mono: "JetBrains Mono", "Fira Code", Consolas, "Courier New", monospace;
  --font-ui: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --transition: 180ms ease;
}

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

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

body {
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(137, 180, 250, 0.08), transparent),
    var(--bg);
}

.app {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem 1.25rem 2.5rem;
}

/* Header */
.header {
  text-align: center;
  margin-bottom: 2rem;
}

.header-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.header h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.75rem, 4vw, 2.35rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

.header-subtitle {
  margin: 0 auto;
  max-width: 640px;
  color: var(--text-muted);
  font-size: 1rem;
}

/* Alert */
.alert {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.9rem 1.1rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(249, 226, 175, 0.25);
  background: rgba(249, 226, 175, 0.08);
  color: var(--warning);
  font-size: 0.875rem;
  margin-bottom: 1.5rem;
}

.alert-icon {
  flex-shrink: 0;
  font-size: 1.1rem;
  line-height: 1.4;
}

.alert strong { color: var(--warning); }

/* Toolbar */
.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.toolbar-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.65rem 1.15rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-ui);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition), color var(--transition);
  user-select: none;
}

.btn:active:not(:disabled) { transform: translateY(1px); }

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

.btn-primary {
  background: var(--success);
  color: #1e1e2e;
  min-width: 120px;
}

.btn-primary:hover:not(:disabled) {
  background: var(--success-hover);
  box-shadow: 0 0 0 3px rgba(166, 227, 161, 0.25);
}

.btn-primary.is-loading {
  pointer-events: none;
  position: relative;
  color: transparent;
}

.btn-primary.is-loading::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(30, 30, 46, 0.25);
  border-top-color: #1e1e2e;
  border-radius: 50%;
  animation: spin 0.65s linear infinite;
}

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

.btn-secondary {
  background: var(--panel);
  color: var(--text);
  border-color: var(--border);
}

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

.btn-copy.is-copied {
  background: rgba(166, 227, 161, 0.15);
  border-color: var(--success);
  color: var(--success);
}

.stats-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.stat {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.stat-value {
  color: var(--text);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.stat-size-change.positive .stat-value { color: var(--danger); }
.stat-size-change.negative .stat-value { color: var(--success); }
.stat-size-change.neutral .stat-value { color: var(--text-muted); }

/* Grid panels */
.panels {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 860px) {
  .panels { grid-template-columns: 1fr; }
}

.panel {
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  min-height: 420px;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.12);
}

.panel-title {
  margin: 0;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--accent);
}

.panel-counter {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.code-area {
  flex: 1;
  width: 100%;
  min-height: 360px;
  padding: 1rem 1.1rem;
  border: none;
  outline: none;
  resize: vertical;
  background: transparent;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.84rem;
  line-height: 1.65;
  tab-size: 2;
}

.code-area::placeholder { color: #6c7086; }

.code-area:focus {
  background: rgba(137, 180, 250, 0.03);
}

.code-area[readonly] {
  cursor: default;
  color: #bac2de;
}

.panel-footer {
  padding: 0.65rem 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.78rem;
  color: var(--text-muted);
  min-height: 2.2rem;
}

.panel-footer.error {
  color: var(--danger);
  background: var(--danger-soft);
}

.panel-footer.success {
  color: var(--success);
}

/* Footer */
.footer {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-privacy {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--accent);
  font-weight: 500;
}

.footer-note {
  margin-top: 0.5rem;
  font-size: 0.78rem;
  opacity: 0.75;
}

.footer-link {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}

.footer-link:hover {
  color: var(--text);
  text-decoration: underline;
}

/* Fade-in animation for output */
@keyframes fadeIn {
  from { opacity: 0.4; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.panel-output.is-updated {
  animation: fadeIn 0.35s ease;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}