/* ============================================
   BUTTONS & HEADER ACTIONS
   Core buttons, header actions, utility states
   ============================================ */

/* Primary Button */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--duration-fast);
    min-height: 44px;
    white-space: nowrap;
}

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

.btn:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

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

.btn--active {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
}

.btn--primary {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
}

.btn--primary:hover {
    background: #b91c1c;
    border-color: #b91c1c;
}

.btn--danger {
    background: var(--color-danger);
    border-color: var(--color-danger);
    color: white;
}

.btn--icon {
    width: 36px;
    height: 36px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Header Actions */
.header__actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-left: auto;
}

@media (max-width: 767px) {
    .header__actions {
        gap: var(--space-1);
    }
    
    .header__actions .btn--icon {
        width: 32px;
        height: 32px;
    }
}

/* Utility: Open State */
.is-open {
    display: block !important;
}

.sidebar.is-open {
    transform: translateX(0);
}

.filter-panel.is-open {
    transform: translateX(0);
}

/* Utility: Hide on Desktop */
@media (min-width: 1024px) {
    .hide-desktop {
        display: none !important;
    }
}

/* Utility: Hide on Mobile */
@media (max-width: 767px) {
    .hide-mobile {
        display: none !important;
    }
}

/* Utility: Screen Reader Only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Utility: Focus Visible */
.focus-visible:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.focus-visible:not(:focus-visible) {
    outline: none;
}