/* ============================================================================
   FILTER BUTTON COMPONENT
   ============================================================================
   
   Standalone filter toggle button with notification badge.
   Used to show/hide filter panels in various views.
   
   Features:
   - Toggle button with icon and text
   - Notification badge showing active filter count
   - Position variants for different contexts (match viewer, document viewer)
   - Smooth animations and transitions
   - Responsive sizing
   - Optional dark mode support
   
   ============================================================================ */

/* ============================================================================
   BASE BUTTON STYLES
   ============================================================================ */

.filter-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--color-white);
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-lg);
    cursor: pointer;
    font-size: 1rem;
    font-family: var(--font-primary);
    transition: var(--transition-all);
    position: relative;
}

.filter-button:hover {
    background: var(--color-sand-light);
    border-color: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.filter-button:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}


/* ============================================================================
   BUTTON ELEMENTS
   ============================================================================ */

/* Filter button icon */
.filter-icon {
    font-size: 1.2rem;
    color: var(--color-primary);
}

/* Filter button text */
.filter-text {
    color: var(--color-text-primary);
    font-weight: var(--font-weight-medium);
}


/* ============================================================================
   ACTIVE FILTER COUNT BADGE
   ============================================================================ */

.filter-badge {
    position: absolute;
    top: -8px;
    right: -8px;
    background: var(--color-danger);
    color: var(--color-white);
    border-radius: var(--radius-full);
    padding: 2px 8px;
    font-size: 0.75rem;
    font-weight: var(--font-weight-bold);
    min-width: 20px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    animation: badge-pop 0.3s ease;  /* Animation defined in animations.css */
}


/* ============================================================================
   POSITION VARIANTS
   ============================================================================ */

/* For MatchViewer - sits in the filter bar area */
.filter-button-match {
    margin: 15px;
}

/* For DocumentViewer - overlays on navigation */
.filter-button-document {
    position: fixed;
    top: 80px;
    inset-inline-start: 20px;
    z-index: var(--z-dropdown);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-lg);
}

.filter-button-document:hover {
    background: rgba(255, 255, 255, 1);
}

/* For NavigationFooter - inline in footer nav bar */
.filter-button-footer {
    position: relative;
    padding: 8px 16px;
    background: var(--color-white);
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
}

.filter-button-footer:hover {
    background: var(--color-sand-light);
    transform: none;
}


/* ============================================================================
   FILTER CONTAINER (Context)
   ============================================================================ */

/* Container for filter button in match viewer */
.filters-container {
    padding: 15px;
    border-bottom: 1px solid var(--color-gray-border);
    background: var(--color-sand-light);
    display: flex;
    align-items: center;
    gap: 10px;
}


/* ============================================================================
   RESPONSIVE DESIGN
   ============================================================================ */

@media (max-width: 768px) {
    .filter-button {
        padding: 8px 16px;
        font-size: 0.9rem;
    }
    
    .filter-button-document {
        top: 60px;
        inset-inline-start: 10px;
    }
}


/* ============================================================================
   DARK MODE SUPPORT (Optional)
   ============================================================================ */

@media (prefers-color-scheme: dark) {
    .filter-button {
        background: #1a1a1a;  /* TODO: Add --color-dark-bg to variables */
        border-color: var(--color-primary);
        color: var(--color-white);
    }
    
    .filter-button:hover {
        background: #2a2a2a;  /* TODO: Add --color-dark-bg-hover to variables */
    }
    
    .filter-text {
        color: var(--color-white);
    }
    
    .filter-icon {
        color: var(--color-sand);
    }
    
    .filter-button-document {
        background: rgba(26, 26, 26, 0.95);
    }
}