/* ─── Buttons ─────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.5;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: 1.5px solid transparent;
  white-space: nowrap;
  user-select: none;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-sm { padding: var(--space-1) var(--space-3); font-size: 0.8125rem; }
.btn-lg { padding: var(--space-3) var(--space-6); font-size: 1rem; }

.btn-primary {
  background: var(--color-primary);
  color: #FFFFFF;
  border-color: var(--color-primary);
}
.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
}

.btn-secondary {
  background: var(--color-primary-bg);
  color: var(--color-primary);
  border-color: var(--color-primary-bg);
}
.btn-secondary:hover:not(:disabled) {
  background: var(--color-primary-light);
  color: #FFFFFF;
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
  border-color: var(--color-border);
}
.btn-ghost:hover:not(:disabled) {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

.btn-success {
  background: var(--color-success);
  color: #FFFFFF;
  border-color: var(--color-success);
}
.btn-success:hover:not(:disabled) { filter: brightness(0.92); }

.btn-warning {
  background: var(--color-warning);
  color: #FFFFFF;
  border-color: var(--color-warning);
}
.btn-warning:hover:not(:disabled) { filter: brightness(0.92); }

.btn-danger {
  background: var(--color-danger);
  color: #FFFFFF;
  border-color: var(--color-danger);
}
.btn-danger:hover:not(:disabled) { filter: brightness(0.92); }

.btn-icon {
  padding: var(--space-2);
  border-radius: var(--radius-sm);
}

/* ─── Cards ───────────────────────────────────────────── */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: background var(--transition), border-color var(--transition);
}

.card-sm { padding: var(--space-4); border-radius: var(--radius-md); }
.card-lg { padding: var(--space-8); border-radius: var(--radius-xl); }

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-5);
}

.card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
}

.card-subtitle {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-top: 2px;
}

/* ─── Stat Cards ──────────────────────────────────────── */
.stat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-6);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.stat-card-label {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.stat-card-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.03em;
  line-height: 1;
}

.stat-card-sub {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.stat-card-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  margin-bottom: var(--space-1);
}

/* ─── Badges ──────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px var(--space-2);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1.4;
}

.badge-primary { background: var(--color-primary-bg); color: var(--color-primary); }
.badge-success { background: var(--color-success-bg); color: var(--color-success); }
.badge-warning { background: var(--color-warning-bg); color: var(--color-warning); }
.badge-danger  { background: var(--color-danger-bg);  color: var(--color-danger); }
.badge-info    { background: var(--color-info-bg);    color: var(--color-info); }
.badge-neutral { background: var(--color-border);     color: var(--color-text-muted); }

/* ─── Progress Bar ────────────────────────────────────── */
.progress-bar-wrap {
  background: var(--color-border);
  border-radius: var(--radius-full);
  height: 8px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  transition: width 0.4s ease;
}

.progress-bar-fill.success { background: var(--color-success); }
.progress-bar-fill.warning { background: var(--color-warning); }
.progress-bar-fill.danger  { background: var(--color-danger); }

/* ─── Form Controls ───────────────────────────────────── */
.form-group { display: flex; flex-direction: column; gap: var(--space-1); }

.form-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.form-input,
.form-select,
.form-textarea {
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-3);
  color: var(--color-text);
  font-size: 0.9375rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  width: 100%;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 3px var(--color-primary-bg);
}

.form-textarea { min-height: 120px; }

/* ─── Tabs ────────────────────────────────────────────── */
.tab-bar {
  display: flex;
  gap: var(--space-1);
  border-bottom: 2px solid var(--color-border);
  margin-bottom: var(--space-6);
}

.tab-btn {
  padding: var(--space-2) var(--space-5);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-muted);
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  cursor: pointer;
  background: none;
  border-left: none;
  border-right: none;
  border-top: none;
}

.tab-btn:hover { color: var(--color-text); }
.tab-btn.active { color: var(--color-primary); border-bottom-color: var(--color-primary); }

.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ─── Modal ───────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: var(--space-4);
  animation: fadeIn var(--transition-fast);
}

.modal-box {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  padding: var(--space-8);
  width: 100%;
  max-width: 520px;
  max-height: 90vh;
  overflow-y: auto;
  animation: slideUp var(--transition);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
}

.modal-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
}

.modal-close {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  transition: background var(--transition-fast);
  font-size: 1.25rem;
  line-height: 1;
}

.modal-close:hover { background: var(--color-surface-active); color: var(--color-text); }

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

/* ─── Toast ───────────────────────────────────────────── */
#toast-root {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  z-index: 2000;
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  font-size: 0.9375rem;
  font-weight: 500;
  max-width: 360px;
  animation: slideInRight var(--transition);
  border-left: 4px solid var(--color-primary);
  color: var(--color-text);
}

.toast.success { border-left-color: var(--color-success); }
.toast.warning { border-left-color: var(--color-warning); }
.toast.danger  { border-left-color: var(--color-danger); }

.toast.fade-out { animation: fadeOut 0.3s ease forwards; }

/* ─── Divider ─────────────────────────────────────────── */
.divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-6) 0;
}

/* ─── Empty State ─────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: var(--space-16) var(--space-8);
  color: var(--color-text-muted);
}

.empty-state-icon { font-size: 3rem; margin-bottom: var(--space-4); }
.empty-state-title { font-size: 1.125rem; font-weight: 600; color: var(--color-text-secondary); margin-bottom: var(--space-2); }
.empty-state-text  { font-size: 0.9375rem; }

/* ─── Loading Spinner ─────────────────────────────────── */
.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

/* ─── Checkbox ────────────────────────────────────────── */
.checkbox-wrap {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
  user-select: none;
}

.checkbox-wrap input[type="checkbox"] {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  border: 1.5px solid var(--color-border);
  cursor: pointer;
  accent-color: var(--color-primary);
  flex-shrink: 0;
}

/* ─── Keyframes ───────────────────────────────────────── */
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes fadeOut {
  from { opacity: 1; transform: translateX(0); }
  to   { opacity: 0; transform: translateX(20px); }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(24px); }
  to   { opacity: 1; transform: translateX(0); }
}

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

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.5; }
}

@keyframes flipIn {
  from { transform: rotateY(-90deg); opacity: 0; }
  to   { transform: rotateY(0deg);   opacity: 1; }
}