.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    height: 44px;
    padding: 0 var(--space-6);
    border: 1px solid transparent;
    border-radius: 999px; 
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
    cursor: pointer;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn:active:not(:disabled) {
    transform: scale(0.97); 
}

.btn-primary {
    background: linear-gradient(180deg, var(--color-primary) 0%, #061f32 100%);
    color: #fff;
    box-shadow: 0 4px 12px rgba(9, 41, 66, 0.2), inset 0 1px 0 rgba(255,255,255,0.1);
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(180deg, #0b3454 0%, #092942 100%);
    box-shadow: 0 6px 16px rgba(9, 41, 66, 0.3), inset 0 1px 0 rgba(255,255,255,0.15);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--color-surface);
    border: 1px solid rgba(9, 41, 66, 0.15);
    color: var(--color-text);
    box-shadow: 0 2px 6px rgba(9, 41, 66, 0.04);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-surface-hover);
    border-color: rgba(9, 41, 66, 0.25);
    box-shadow: 0 4px 12px rgba(9, 41, 66, 0.08);
    transform: translateY(-1px);
}

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

.btn-danger:hover:not(:disabled) {
    filter: brightness(0.95);
}

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

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

.btn-sm {
    height: 36px;
    padding: 0 var(--space-4);
}

.btn-lg {
    height: 52px;
    padding: 0 var(--space-8);
}

.btn-block {
    width: 100%;
}