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var(--transition-normal);position:relative;overflow:hidden}.assignment-card:before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--primary);transform:scaleY(0);transition:transform var(--transition-fast)}.assignment-card:hover{transform:translateY(-2px);box-shadow:0 8px 24px var(--shadow-medium);border-color:var(--primary)}.assignment-card:hover:before{transform:scaleY(1)}.assignment-card.overdue:before{background:#dc2626;transform:scaleY(1)}.assignment-card.overdue{border-color:#dc2626}.assignment-card-header{display:flex;justify-content:space-between;align-items:start;margin-bottom:1rem}.assignment-card-title{font-size:1.125rem;font-weight:600;color:var(--foreground);margin:0}.assignment-card-meta{font-size:.875rem;color:var(--text-muted);margin:.5rem 0}.assignment-card-due{font-size:.8rem;font-weight:500;padding:.25rem .5rem;background:var(--secondary);border-radius:var(--radius-sm);border:1px solid var(--border)}.assignment-card-due.overdue{background:#fef2f2;border-color:#fecaca;color:#dc2626}.discussion-card{background:var(--surface-elevated);border-radius:var(--radius-lg);padding:1.5rem;margin-bottom:1rem;transition:all var(--transition-normal);border:1px solid var(--border);border-left:4px solid var(--accent)}.discussion-card:hover{transform:translateY(-2px);box-shadow:0 8px 24px var(--shadow-medium)}.discussion-card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem}.discussion-card-title{font-size:1.125rem;font-weight:600;color:var(--foreground);margin:0}.discussion-card-replies{font-size:.875rem;color:var(--text-muted);background:var(--secondary);padding:.25rem .5rem;border-radius:var(--radius-sm);border:1px solid var(--border)}.announcement-card{background:var(--surface-elevated);border-radius:var(--radius-lg);padding:1.5rem;margin-bottom:1rem;transition:all var(--transition-normal);border:1px solid var(--border);border-left:4px solid #f59e0b}.announcement-card:hover{transform:translateY(-2px);box-shadow:0 8px 24px var(--shadow-medium)}.announcement-card-header{display:flex;justify-content:space-between;align-items:start;margin-bottom:1rem}.announcement-card-title{font-size:1.125rem;font-weight:600;color:var(--foreground);margin:0}.announcement-card-date{font-size:.875rem;color:var(--text-muted);background:var(--secondary);padding:.25rem .5rem;border-radius:var(--radius-sm);border:1px solid var(--border)}.file-browser{background:var(--surface-elevated);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;box-shadow:0 2px 8px var(--shadow-light)}.file-browser-header{background:var(--gradient-secondary)}.file-browser-header,.file-browser-item{padding:1rem;border-bottom:1px solid var(--border)}.file-browser-item{display:flex;align-items:center;transition:all var(--transition-fast);cursor:pointer}.file-browser-item:hover{background:var(--secondary)}.file-browser-item:last-child{border-bottom:none}.file-browser-icon{width:2rem;height:2rem;margin-right:1rem;display:flex;align-items:center;justify-content:center;background:var(--secondary);border-radius:var(--radius-sm);font-size:1.125rem}.file-browser-name{flex:1;font-weight:500;color:var(--foreground)}.file-browser-size{font-size:.875rem;color:var(--text-muted);margin-left:1rem}.breadcrumb{display:flex;align-items:center;gap:.5rem;margin-bottom:2rem;padding:1rem;background:var(--surface-elevated);border:1px solid var(--border);border-radius:var(--radius-md)}.breadcrumb-item{color:var(--text-muted);text-decoration:none;font-size:.875rem;transition:color 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