/* Materials System Styles */
.materials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.material-card {
    background: var(--card);
    border-radius: 12px;
    padding: 1.25rem;
    border-right: 3px solid var(--cv);
    transition: all 0.2s;
}

.material-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
}

.material-icon {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
}

.material-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.material-program {
    font-size: 0.75rem;
    color: var(--text3);
    margin-bottom: 1rem;
}

.material-files {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.material-file {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem;
    background: var(--bg2);
    border-radius: 6px;
}

.material-file-link {
    flex: 1;
    color: var(--text);
    text-decoration: none;
    font-size: 0.8rem;
}

.material-file-link:hover {
    color: var(--blue);
}

/* Materials System Header */
#materialsSystem .header-right {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    flex-wrap: wrap;
}

#materialsSystem .header-right .btn {
    padding: 0.4rem 0.7rem;
    font-size: 0.75rem;
    border-radius: 6px;
}

#materialsSystem .header-actions .btn {
    padding: 0.4rem 0.7rem;
    font-size: 0.75rem;
    border-radius: 6px;
}

/* File Viewer Modal (view-only for coordinators) */
.file-viewer-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.88);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    -webkit-user-select: none;
    user-select: none;
}

.file-viewer-container {
    width: 92vw;
    height: 90vh;
    display: flex;
    flex-direction: column;
    background: white;
    border-radius: 12px;
    overflow: hidden;
}

.file-viewer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    background: #1e293b;
    color: white;
}

.file-viewer-title {
    font-weight: 600;
    font-size: 1rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-viewer-close {
    background: rgba(255,255,255,0.15);
    border: none;
    color: white;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.file-viewer-close:hover {
    background: rgba(255,255,255,0.3);
}

.file-viewer-content {
    flex: 1;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f1f5f9;
}

.btn-view-file {
    padding: 0.3rem 0.6rem;
    font-size: 0.75rem;
    background: #2563eb;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.btn-view-file:hover {
    background: #1d4ed8;
}