/* ==========================================================================
   MOBILE BLOG FILTERS - BOTTOM SHEET MODAL
   Mobile-only styles for blog search and categories (max-width: 768px)
   Desktop version remains completely unchanged
   ========================================================================== */

/* CSS Custom Properties for Theming */
:root {
    --blog-filter-primary: #667eea;
    --blog-filter-primary-hover: #764ba2;
    --blog-filter-bg: #ffffff;
    --blog-filter-text: #1f2937;
    --blog-filter-text-secondary: #6b7280;
    --blog-filter-border: #e5e7eb;
    --blog-filter-backdrop: rgba(0, 0, 0, 0.5);
    --blog-filter-transition: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================================================
   DESKTOP PROTECTION - Hide Mobile Elements on Desktop
   ========================================================================== */
@media (min-width: 769px) {
    .mobile-blog-filter-controls,
    .mobile-search-btn,
    .mobile-filter-btn,
    .mobile-blog-filter-modal,
    .mobile-filter-backdrop {
        display: none !important;
    }
}

/* ==========================================================================
   MOBILE FILTER CONTROLS - Sticky Header
   ========================================================================== */
@media (max-width: 768px) {
    .mobile-blog-filter-controls {
        position: sticky;
        top: 70px; /* Below header (header is 70px when scrolled) */
        z-index: 100;
        background: var(--blog-filter-bg);
        border-bottom: 1px solid var(--blog-filter-border);
        padding: 12px 16px;
        display: flex;
        align-items: center;
        gap: 12px;
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    }

    /* Search Button */
    .mobile-search-btn {
        flex: 1;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        padding: 12px 20px;
        background: linear-gradient(135deg, var(--blog-filter-primary) 0%, var(--blog-filter-primary-hover) 100%);
        border: none;
        border-radius: 8px;
        font-size: 14px;
        font-weight: 600;
        color: white;
        cursor: pointer;
        transition: all var(--blog-filter-transition);
        min-height: 48px; /* Touch-friendly */
    }

    .mobile-search-btn:active {
        transform: scale(0.98);
        box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
    }

    .mobile-search-btn i {
        font-size: 16px;
    }

    /* Filter Button */
    .mobile-filter-btn {
        flex: 1;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        padding: 12px 20px;
        background: white;
        border: 2px solid var(--blog-filter-primary);
        border-radius: 8px;
        font-size: 14px;
        font-weight: 600;
        color: var(--blog-filter-primary);
        cursor: pointer;
        transition: all var(--blog-filter-transition);
        min-height: 48px; /* Touch-friendly */
    }

    .mobile-filter-btn:active {
        background: #f8f9ff;
        transform: scale(0.98);
    }

    .mobile-filter-btn i {
        font-size: 16px;
    }

    /* Hide desktop sidebar on mobile */
    .blog-sidebar {
        display: none !important;
    }

    /* ==========================================================================
       MOBILE FILTER MODAL - Bottom Sheet
       ========================================================================== */

    /* Backdrop */
    .mobile-filter-backdrop {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--blog-filter-backdrop);
        z-index: 1098; /* Below modal, above content */
        opacity: 0;
        visibility: hidden;
        transition: opacity var(--blog-filter-transition), visibility var(--blog-filter-transition);
        backdrop-filter: blur(2px);
        -webkit-backdrop-filter: blur(2px);
    }

    .mobile-filter-backdrop.active {
        opacity: 1;
        visibility: visible;
    }

    /* Modal Container */
    .mobile-blog-filter-modal {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        z-index: 1000;
        display: none;
    }

    .mobile-blog-filter-modal.active {
        display: block;
    }

    /* Bottom Sheet Panel */
    .mobile-filter-panel {
        position: absolute;
        bottom: 0;
        left: 0;
        right: 0;
        max-height: 70vh;
        background: var(--blog-filter-bg);
        border-radius: 16px 16px 0 0;
        z-index: 1099; /* Above backdrop */
        display: flex;
        flex-direction: column;
        transform: translateY(100%);
        transition: transform var(--blog-filter-transition);
        box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.15);
    }

    .mobile-blog-filter-modal.active .mobile-filter-panel {
        transform: translateY(0);
    }

    .mobile-blog-filter-modal.closing .mobile-filter-panel {
        transform: translateY(100%);
    }

    /* Modal Header */
    .mobile-filter-panel .modal-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 20px 20px 16px;
        border-bottom: 1px solid var(--blog-filter-border);
        flex-shrink: 0;
    }

    .mobile-filter-panel .modal-header h3 {
        font-size: 18px;
        font-weight: 600;
        color: var(--blog-filter-text);
        margin: 0;
    }

    .mobile-filter-panel .modal-header .close-btn {
        width: 44px;
        height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
        background: transparent;
        border: none;
        border-radius: 8px;
        cursor: pointer;
        transition: background var(--blog-filter-transition);
        color: var(--blog-filter-text-secondary);
    }

    .mobile-filter-panel .modal-header .close-btn:hover {
        background: #f3f4f6;
    }

    .mobile-filter-panel .modal-header .close-btn:active {
        transform: scale(0.95);
    }

    .mobile-filter-panel .modal-header .close-btn i {
        font-size: 20px;
    }

    /* Modal Content - Scrollable */
    .mobile-filter-panel .modal-content {
        flex: 1;
        overflow-y: auto;
        overflow-x: hidden;
        padding: 20px;
        -webkit-overflow-scrolling: touch;
    }

    /* Widgets in Modal */
    .mobile-filter-panel .sidebar-widget {
        background: white;
        padding: 0;
        margin-bottom: 24px;
        border: none;
        box-shadow: none;
    }

    .mobile-filter-panel .sidebar-widget:last-child {
        margin-bottom: 0;
    }

    .mobile-filter-panel .widget-subtitle {
        font-size: 16px;
        font-weight: 600;
        color: var(--blog-filter-text);
        margin: 0 0 16px 0;
        padding-bottom: 12px;
        border-bottom: 2px solid var(--blog-filter-border);
    }

    /* Search Form in Modal */
    .mobile-filter-panel .search-form {
        position: relative;
        display: flex;
        margin-bottom: 0;
    }

    .mobile-filter-panel .search-form input {
        flex: 1;
        padding: 12px 50px 12px 16px;
        border: 2px solid var(--blog-filter-border);
        border-radius: 8px;
        font-size: 15px;
        color: var(--blog-filter-text);
        transition: border-color var(--blog-filter-transition);
        min-height: 48px; /* Touch-friendly */
    }

    .mobile-filter-panel .search-form input:focus {
        outline: none;
        border-color: var(--blog-filter-primary);
        box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    }

    .mobile-filter-panel .search-form button {
        position: absolute;
        right: 0;
        top: 0;
        height: 100%;
        width: 50px;
        background: transparent;
        border: none;
        color: var(--blog-filter-primary);
        font-size: 16px;
        cursor: pointer;
        transition: color var(--blog-filter-transition);
    }

    .mobile-filter-panel .search-form button:active {
        color: var(--blog-filter-primary-hover);
    }

    /* Categories List in Modal */
    .mobile-filter-panel .categories-list {
        list-style: none;
        padding: 0;
        margin: 0;
    }

    .mobile-filter-panel .categories-list li {
        margin-bottom: 0;
    }

    .mobile-filter-panel .categories-list a {
        display: flex;
        align-items: center;
        padding: 14px 12px;
        color: var(--blog-filter-text);
        text-decoration: none;
        border-radius: 8px;
        transition: all var(--blog-filter-transition);
        font-size: 15px;
        font-weight: 500;
        background: white;
        border-bottom: 1px solid #f3f4f6;
        min-height: 48px; /* Touch-friendly */
    }

    .mobile-filter-panel .categories-list a:active {
        background: #f8f9ff;
        color: var(--blog-filter-primary);
        transform: translateX(3px);
    }

    .mobile-filter-panel .categories-list i {
        margin-right: 12px;
        font-size: 16px;
        color: var(--blog-filter-primary);
        width: 20px;
        text-align: center;
    }
}

/* ==========================================================================
   ANIMATIONS
   ========================================================================== */
@keyframes slideUp {
    from {
        transform: translateY(100%);
    }
    to {
        transform: translateY(0);
    }
}

@keyframes slideDown {
    from {
        transform: translateY(0);
    }
    to {
        transform: translateY(100%);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* ==========================================================================
   ACCESSIBILITY
   ========================================================================== */
@media (max-width: 768px) {
    /* Ensure proper focus states */
    .mobile-search-btn:focus,
    .mobile-filter-btn:focus,
    .mobile-filter-panel .modal-header .close-btn:focus,
    .mobile-filter-panel .search-form input:focus {
        outline: 2px solid var(--blog-filter-primary);
        outline-offset: 2px;
    }

    /* Prevent body scroll when modal is open */
    body.modal-open {
        overflow: hidden;
        position: fixed;
        width: 100%;
    }
}