/* ============================================
   MATERIALS TAB STYLES
   ============================================ */
#tab-materials {
    overflow-x: hidden;
}
/* ---------- HEADER ---------- */
.materials-tab-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    width: 100%;
}

.materials-tab-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.filter-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: .4rem .5rem;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: .4rem;
    cursor: pointer;
    color: var(--text-primary);
    font-size: 0.8rem;
    font-weight: 500;
    font-family: 'Poppins', sans-serif;
    transition: all var(--transition-fast);
    position: fixed;
    right: 10px;
    top: calc(var(--top-bar-height) + var(--safe-top) + 8px);
}

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

.filter-btn .material-icons-round {
    font-size: 1rem;
    pointer-events: none;
}

.filter-btn-text {
    pointer-events: none;
}

/* ---------- ACTIVE FILTERS ---------- */
.active-filters {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.active-filter-chip {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--accent-light);
    color: var(--accent-color);
    border-radius: 16px;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.active-filter-chip:hover {
    background: var(--accent-color);
    color: #ffffff;
}

.active-filter-chip .material-icons-round {
    font-size: 1.375rem;    pointer-events: none;
}

/* ---------- MATERIALS GRID ---------- */
.materials-tab-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
    width: 100%;
}

/* Material card - same style as home tab */
.material-tab-card {
    display: flex;
    flex-direction: column;
    background: transparent;
    border: 1px solid var(--divider-color);
    border-radius: 12px;
    cursor: pointer;
    transition: transform var(--transition-fast);
    position: relative;
    padding: 4px;
}


/* Material icon container */
.material-tab-card-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    aspect-ratio: 4 / 1;
    border-radius: 12px;
    margin-bottom: 12px;
    flex-shrink: 0;
}

.material-tab-card-icon .material-icons-round {
    font-size: 5rem;    color: #ffffff;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.3));
}

/* Material info */
.material-tab-card-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 0 4px;
    flex: 1;
}

.material-tab-card-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin: 0;
}

.material-tab-card-summary {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.material-tab-card-subject {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.material-tab-card-meta {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    color: var(--text-tertiary);
    flex-wrap: wrap;
    margin-top: 2px;
}

.material-tab-card-meta .meta-divider {
    width: 3px;
    height: 3px;
    background: var(--text-tertiary);
    border-radius: 50%;
    flex-shrink: 0;
}

/* Card actions */
.material-tab-card-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 8px 4px 4px 4px;
    margin-top: auto;
}

.view-material-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: .3rem;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    font-family: 'Poppins', sans-serif;
    transition: all var(--transition-fast);
    flex: 1;
    justify-content: center;
}

.view-material-btn:hover {
    background: var(--diviider-color);
}

.view-material-btn:active {
    background: var(--diviider-colore);
}

.view-material-btn .material-icons-round {
    font-size: 1.5rem;    pointer-events: none;
}

.download-material-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    min-width: 36px;
    border-radius: .3rem;
    background: transparent;
    border: 1px solid var(--border-color);
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}


.download-material-btn .material-icons-round {
    font-size: 1.625rem;    pointer-events: none;
}

/* ---------- LOADING STATE ---------- */
.materials-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 48px;
    color: var(--text-secondary);
}

.materials-loading .material-icons-round {
    font-size: 3.5rem;    color: var(--accent-color);
    animation: pulse 1.5s ease infinite;
}

/* ---------- FILTER MODAL ---------- */
.filter-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 9999;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: none;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.filter-modal-overlay.active {
    display: flex;
    opacity: 1;
}

.filter-modal {
    background: var(--bg-surface);
    border-radius: .7rem;
    width: 80%;
    max-width: 500px;
    max-height: 80svh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transform: scale(0.9);
    transition: transform 0.3s ease;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    position: relative;
    top: 0;
}

.filter-modal-overlay.active .filter-modal {
    transform: scale(1);
}

/* Modal header */
.filter-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px;
    border-bottom: 1px solid var(--divider-color);
}

.filter-modal-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.filter-modal-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.filter-modal-close:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.filter-modal-close .material-icons-round {
    font-size: 1.875rem;    pointer-events: none;
}

/* Modal content */
.filter-modal-content {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

/* View All option */
.filter-option {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 12px;
    background: transparent;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: 'Poppins', sans-serif;
    margin-bottom: 4px;
}

.filter-option:hover {
    background: var(--bg-hover);
}

.filter-option.active {
    border:1px solid var(--accent-light);
}

.filter-option-icon {
    font-size: 1.875rem;    color: var(--text-secondary);
    pointer-events: none;
}

.filter-option.active .filter-option-icon {
    color: var(--accent-color);
}

.filter-option-label {
    flex: 1;
    text-align: left;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
    pointer-events: none;
}

.filter-option-check {
    font-size: 1.625rem;    color: var(--accent-color);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-fast);
}

.filter-option.active .filter-option-check {
    opacity: 1;
}

/* Filter groups */
.filter-group {
    margin-top: 20px;
}

.filter-group-title {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 8px;
}

.filter-options-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

/* Modal footer */
.filter-modal-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 16px 20px;
    border-top: 1px solid var(--divider-color);
}

.filter-clear-btn {
    padding: 10px 20px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: .4rem;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    font-family: 'Poppins', sans-serif;
    transition: all var(--transition-fast);
}

.filter-clear-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.filter-apply-btn {
    padding: 10px 24px;
    background: var(--accent-color);
    border: none;
    border-radius: .4rem;
    cursor: pointer;
    color: #ffffff;
    font-size: 0.85rem;
    font-weight: 600;
    font-family: 'Poppins', sans-serif;
    transition: all var(--transition-fast);
}

.filter-apply-btn:hover {
    background: var(--accent-hover);
    transform: scale(1.03);
}

.filter-apply-btn:active {
    transform: scale(0.97);
}

/* ---------- MOBILE RESPONSIVE ---------- */
@media (max-width: 710px) {
    .materials-tab-title {
        font-size: 1.4rem;
    }
    
    .material-tab-card-icon .material-icons-round {
        font-size: 4.5rem;    }

    .filter-modal-content {
        padding: .4rem;
    }

    .filter-option {
        padding: .5rem;
        font-size: 0.8rem;
    }
    .filter-modal-footer {
        padding: .5rem;
    }

    .filter-clear-btn {
        padding: .5rem .6rem;
        font-size: 0.7rem;
    }

    .filter-apply-btn {
        padding: .3rem .4rem;
        font-size: 0.7rem;
    }



    .filter-modal-title {
        font-size: 0.9rem;
    }

    .filter-modal-header {
        padding: .5rem;
        padding-left: .8rem;
    }
    
    .filter-modal {
        width: 95%;
        max-height: 70vh;
    }
    
    .materials-tab-grid {
        gap: 12px;
    }
}

/* Tablet */
@media (min-width: 711px) and (max-width: 1024px) {
    .materials-tab-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
}

/* Thumbnail mode for grid cards */
.material-card-icon.has-thumbnail {
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.material-card-icon.has-thumbnail .material-icons-round {
    display: none;
}