.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-sm);padding:var(--space-sm) var(--space-lg);font-size:var(--font-size-base);font-weight:500;border-radius:var(--radius-md);transition:all var(--transition-fast);white-space:nowrap}.btn--primary{background-color:var(--color-primary);color:var(--color-text-inverse)}.btn--primary:hover{background-color:var(--color-primary-hover)}.btn--secondary{background-color:var(--color-surface);color:var(--color-text);border:1px solid var(--color-border)}.btn--secondary:hover{background-color:var(--color-primary-light);border-color:var(--color-primary)}.btn--success{background-color:var(--color-success);color:var(--color-text-inverse)}.btn--danger{background-color:var(--color-error);color:var(--color-text-inverse)}.btn--ghost{background-color:transparent;color:var(--color-primary)}.btn--ghost:hover{background-color:var(--color-primary-light)}.btn--lg{padding:var(--space-md) var(--space-xl);font-size:var(--font-size-lg)}.btn--sm{padding:var(--space-xs) var(--space-md);font-size:var(--font-size-sm)}.btn--full{width:100%}.btn--round{border-radius:var(--radius-full);width:48px;height:48px;padding:0}.btn--round.btn--lg{width:64px;height:64px}.btn:disabled{opacity:.5;cursor:not-allowed}.btn__icon{width:20px;height:20px}.card{background-color:var(--color-surface);border-radius:var(--radius-lg);padding:var(--space-lg);box-shadow:var(--shadow-sm)}.card--elevated{box-shadow:var(--shadow-md)}.card__header{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--space-md)}.card__title{font-size:var(--font-size-lg);font-weight:600}.card__subtitle{font-size:var(--font-size-sm);color:var(--color-text-muted)}.form-group{margin-bottom:var(--space-md)}.form-label{display:block;margin-bottom:var(--space-xs);font-size:var(--font-size-sm);font-weight:500;color:var(--color-text)}.form-input,.form-select,.form-textarea{width:100%;padding:var(--space-sm) var(--space-md);font-size:var(--font-size-base);background-color:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);transition:border-color var(--transition-fast),box-shadow var(--transition-fast)}.form-input:focus,.form-select:focus,.form-textarea:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-light);outline:0}.form-textarea{min-height:100px;resize:vertical}.form-select{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23718096' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right var(--space-md) center;padding-right:var(--space-2xl)}.toggle{position:relative;display:inline-block;width:48px;height:28px}.toggle__input{opacity:0;width:0;height:0}.toggle__slider{position:absolute;cursor:pointer;inset:0;background-color:var(--color-border);border-radius:var(--radius-full);transition:background-color var(--transition-fast)}.toggle__slider::before{content:'';position:absolute;width:22px;height:22px;left:3px;bottom:3px;background-color:#fff;border-radius:50%;transition:transform var(--transition-fast)}.toggle__input:checked+.toggle__slider{background-color:var(--color-primary)}.toggle__input:checked+.toggle__slider::before{transform:translateX(20px)}.badge{display:inline-flex;align-items:center;padding:var(--space-xs) var(--space-sm);font-size:var(--font-size-xs);font-weight:500;border-radius:var(--radius-full)}.badge--primary{background-color:var(--color-primary-light);color:var(--color-primary)}.badge--success{background-color:var(--color-success-light);color:var(--color-success)}.badge--warning{background-color:var(--color-warning-light);color:var(--color-warning)}.badge--error{background-color:var(--color-error-light);color:var(--color-error)}.empty-state{text-align:center;padding:var(--space-2xl)}.empty-state__icon{width:64px;height:64px;margin:0 auto var(--space-md);color:var(--color-text-muted)}.empty-state__title{font-size:var(--font-size-lg);margin-bottom:var(--space-sm)}.empty-state__description{color:var(--color-text-muted);margin-bottom:var(--space-lg)}.divider{height:1px;background-color:var(--color-border);margin:var(--space-md) 0}.setting-row{display:flex;align-items:center;justify-content:space-between;padding:var(--space-md) 0;border-bottom:1px solid var(--color-border)}.setting-row:last-child{border-bottom:none}.setting-row__label{font-weight:500}.setting-row__description{font-size:var(--font-size-sm);color:var(--color-text-muted)}.stat-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--space-md)}