.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  line-height: 1;
  letter-spacing: 0.01em;
  padding: 0 var(--space-5);
  height: 40px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition-base);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  isolation: isolate;
}

.btn::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, transparent 60%);
  pointer-events: none;
  opacity: 0;
  transition: var(--transition-fast);
}

.btn:hover::after { opacity: 1; }

.btn-primary {
  background: linear-gradient(135deg, var(--brand-500) 0%, var(--brand-600) 100%);
  color: #fff;
  border-color: var(--brand-600);
  box-shadow: 0 2px 12px rgba(0, 184, 219, 0.3), 0 1px 3px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255,255,255,0.12);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--brand-400) 0%, var(--brand-500) 100%);
  border-color: var(--brand-500);
  box-shadow: 0 4px 20px rgba(0, 211, 243, 0.35), 0 2px 8px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255,255,255,0.15);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--color-primary-subtle);
  color: var(--color-primary);
  border-color: var(--border-default);
  box-shadow: var(--shadow-xs);
}

.btn-secondary:hover {
  background: color-mix(in srgb, var(--brand-500) 18%, transparent);
  border-color: var(--border-strong);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: var(--border-default);
}

.btn-ghost:hover {
  background: var(--surface-raised);
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.btn-danger {
  background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
  color: #fff;
  border-color: #dc2626;
  box-shadow: 0 2px 12px rgba(239, 68, 68, 0.3);
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--radius-md);
}

.btn-sm { height: 32px; padding: 0 var(--space-4); font-size: var(--text-xs); border-radius: var(--radius-sm); }
.btn-lg { height: 50px; padding: 0 var(--space-8); font-size: var(--text-base); border-radius: var(--radius-lg); }
.btn-xl { height: 58px; padding: 0 var(--space-10); font-size: var(--text-lg); border-radius: var(--radius-lg); }

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.38;
  cursor: not-allowed;
  pointer-events: none;
  transform: none !important;
  box-shadow: none !important;
}

.card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  box-shadow: var(--shadow-md), var(--glass-glow);
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0,211,243,0.3), transparent);
  pointer-events: none;
}

.card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--glass-shine);
  pointer-events: none;
  border-radius: inherit;
}

.card:hover {
  border-color: var(--glass-border-hover);
  box-shadow: var(--shadow-lg), var(--glass-glow-strong);
  transform: translateY(-2px);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-label {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--text-secondary);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  height: 42px;
  padding: 0 var(--space-4);
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--text-primary);
  transition: var(--transition-base);
  backdrop-filter: blur(var(--glass-blur-light));
  -webkit-backdrop-filter: blur(var(--glass-blur-light));
}

.form-textarea {
  height: auto;
  min-height: 100px;
  padding: var(--space-3) var(--space-4);
  resize: vertical;
  line-height: var(--leading-normal);
}

.form-input::placeholder,
.form-textarea::placeholder { color: var(--input-placeholder); }

.form-input:hover,
.form-textarea:hover,
.form-select:hover {
  border-color: var(--border-strong);
  background: var(--input-focus-bg);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--color-primary-subtle), 0 0 12px var(--color-primary-glow);
  background: var(--input-focus-bg);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 3px var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  white-space: nowrap;
  border: 1px solid transparent;
}

.badge-primary {
  background: var(--color-primary-subtle);
  color: var(--color-primary);
  border-color: var(--border-default);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  border: 1px solid var(--border-default);
  background: var(--surface-raised);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  transition: var(--transition-fast);
}

.chip:hover,
.chip.active {
  border-color: var(--border-strong);
  color: var(--text-primary);
  background: var(--color-primary-subtle);
}

.alert {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-lg);
  border: 1px solid transparent;
  font-size: var(--text-sm);
}

.alert-info {
  background: color-mix(in srgb, var(--brand-500) 10%, transparent);
  border-color: color-mix(in srgb, var(--brand-500) 25%, transparent);
  color: var(--text-brand);
}

.tabs {
  display: flex;
  gap: var(--space-1);
  border-bottom: 1px solid var(--border-subtle);
}

.tab-item {
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--text-muted);
  cursor: pointer;
  border: none;
  background: transparent;
  border-bottom: 2px solid transparent;
  transition: var(--transition-fast);
}

.tab-item.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.pagination {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.page-item {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--text-secondary);
  border: 1px solid transparent;
  transition: var(--transition-fast);
}

.page-item.active {
  background: var(--color-primary-subtle);
  border-color: var(--color-primary);
  color: var(--color-primary);
}