.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    border: none;
    border-radius: var(--radius-md);
    padding: 11px var(--space-5);
    font-size: var(--text-sm);
    font-weight: 600;
    line-height: 1.2;
    transition: background var(--transition), transform var(--transition), opacity var(--transition);
    white-space: nowrap;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background: var(--color-brand-red);
    color: #fff;
    box-shadow: 0 1px 2px rgba(226, 26, 34, 0.25);
}

.btn-primary:hover {
    background: var(--color-brand-red-hover);
}

.btn-block {
    width: 100%;
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text);
    border: 1px solid var(--color-border-strong);
}

.btn-secondary:hover {
    background: var(--color-bg);
}

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

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

.btn-dark {
    background: var(--color-header-bg);
    color: #fff;
}

.btn-dark:hover {
    background: #000;
}

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

.btn-success:hover {
    filter: brightness(0.92);
}

.btn-warning {
    background: var(--color-warning-bg);
    color: var(--color-warning);
}

.btn-warning:hover {
    filter: brightness(0.96);
}

.btn-sm {
    padding: 7px 14px;
    font-size: var(--text-xs);
}

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    border: none;
    background: transparent;
    color: var(--color-text-tertiary);
    transition: background var(--transition), color var(--transition);
}

.btn-icon:hover {
    background: var(--color-bg);
    color: var(--color-text);
}

.btn-icon.danger:hover {
    background: var(--color-brand-red-tint);
    color: var(--color-brand-red);
}

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