:root{--color-primary: #3498db;--color-primary-hover: #2980b9;--color-danger: #e74c3c;--color-danger-hover: #c0392b;--color-success: #27ae60;--color-success-hover: #229954;--color-dark: #2c3e50;--color-dark-header: #34495e;--color-muted: #7f8c8d;--color-border: #ddd;--color-bg-light: #f8f9fa;--color-bg-subtle: #ecf0f1;--color-bg-page: #f5f5f5;--color-purple: #8e44ad;--color-teal: #17a2b8;--color-warning: #e67e22;--color-amber: #f39c12;--color-amber-dark: #856404;--color-amber-light: #ffc107;--color-scheduled-bg: var(--color-scheduled-bg);--color-scheduled-br: var(--color-scheduled-br);--color-error-bg: var(--color-error-bg);--color-error-br: var(--color-error-br);--color-error-text: var(--color-error-text);--color-info-bg: var(--color-info-bg);--color-info-text: var(--color-info-text);--color-warn-bg: var(--color-warn-bg);--color-overlap-bg: var(--color-overlap-bg);--color-conflict-bg: var(--color-conflict-bg);--color-hover-bg: var(--color-hover-bg);--color-scrollbar-track: var(--color-scrollbar-track);--color-btn-secondary-hv: var(--color-btn-secondary-hv);--color-border-subtle: var(--color-border-subtle);--color-border-card: var(--color-border-card);--color-text-body: var(--color-text-body);--color-text-muted2: var(--color-text-muted2);--color-remove-hover-bg: var(--color-remove-hover-bg);--radius: 4px;--radius-lg: 8px;--shadow: 0 2px 4px rgba(0, 0, 0, .1);--shadow-lg: 0 4px 20px rgba(0, 0, 0, .3)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;background:var(--color-bg-page);color:#333}.container{max-width:1800px;margin:0 auto;padding:20px}header{background:#fff;padding:20px;border-radius:8px;margin-bottom:20px;box-shadow:0 2px 4px #0000001a;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:15px}header h1{font-size:24px;color:var(--color-dark)}.schedule-controls{display:flex;gap:10px;align-items:center}.schedule-controls select{padding:8px 12px;border:1px solid #ddd;border-radius:4px;font-size:14px;background:#fff;min-width:200px}#scheduleQuarter{min-width:140px}.schedule-controls button{padding:6px 12px;font-size:13px;background:var(--color-success)}.schedule-controls button:hover{background:var(--color-success-hover)}#deleteScheduleBtn{background:var(--color-danger)!important}#deleteScheduleBtn:hover{background:var(--color-danger-hover)!important}.help-icon{display:inline-block;width:24px;height:24px;line-height:24px;text-align:center;background:var(--color-primary);color:#fff;border-radius:50%;font-size:16px;font-weight:700;cursor:pointer;margin-left:10px;vertical-align:middle;transition:background .2s,transform .2s}.help-icon:hover{background:var(--color-primary-hover);transform:scale(1.1)}.data-controls{display:flex;gap:10px}button{padding:8px 16px;background:var(--color-primary);color:#fff;border:none;border-radius:4px;cursor:pointer;font-size:14px;transition:background .2s}button:hover{background:var(--color-primary-hover)}.main-content{display:flex;gap:20px}.sidebar{width:350px;min-width:350px;display:flex;flex-direction:column;gap:20px;max-height:calc(100vh - 180px);overflow-y:auto;padding-right:5px;position:sticky;top:20px;align-self:flex-start}.sidebar::-webkit-scrollbar{width:8px}.sidebar::-webkit-scrollbar-track{background:var(--color-scrollbar-track);border-radius:4px}.sidebar::-webkit-scrollbar-thumb{background:var(--color-scrollbar, #888);border-radius:4px}.sidebar::-webkit-scrollbar-thumb:hover{background:var(--color-scrollbar-hover, #555)}.panel{background:#fff;padding:20px;border-radius:8px;box-shadow:0 2px 4px #0000001a}.panel h2{font-size:18px;margin-bottom:15px;color:var(--color-dark)}.collapsible-header{cursor:pointer;-webkit-user-select:none;user-select:none;display:flex;align-items:center;gap:8px;transition:color .2s}.collapsible-header:hover{color:var(--color-primary)}.collapse-icon{font-size:14px;transition:transform .2s}.collapsible-section{display:block;animation:slideDown .2s ease-out}@keyframes slideDown{0%{opacity:0;max-height:0}to{opacity:1;max-height:1000px}}form{display:flex;flex-direction:column;gap:10px;margin-bottom:15px}input,select{padding:8px;border:1px solid #ddd;border-radius:4px;font-size:14px}input:focus,select:focus{outline:none;border-color:var(--color-primary)}#instructorsList,#coursesList,#programsList{display:flex;flex-direction:column;gap:8px}.instructor-item,.course-item,.program-item{padding:10px;background:var(--color-bg-light);border-radius:4px;display:flex;justify-content:space-between;align-items:center}.program-item{border-left:4px solid var(--color-purple)}.program-name{font-weight:600;color:var(--color-dark)}.program-meta{font-size:12px;color:var(--color-muted)}.program-filter{margin-bottom:15px}.program-filter select{width:100%;padding:8px 12px;border:1px solid #ddd;border-radius:4px;font-size:14px;background:#fff}.quarters-offered-dropdown{position:relative}.quarters-offered-dropdown .filter-toggle{width:100%;padding:8px 12px;background:#fff;border:1px solid #ddd;border-radius:4px;cursor:pointer;font-size:14px;text-align:left;transition:border-color .2s;color:#333}.quarters-offered-dropdown .filter-toggle:hover{border-color:var(--color-primary);background:#fff}.quarters-offered-dropdown .filter-list{position:absolute;top:calc(100% + 5px);left:0;right:0;background:#fff;border:1px solid #ddd;border-radius:4px;box-shadow:0 4px 8px #0000001a;max-height:200px;overflow-y:auto;z-index:1000}.instructor-filter{margin-bottom:15px}.filter-dropdown{position:relative}.filter-toggle{width:100%;padding:8px 12px;background:#fff;border:1px solid #ddd;border-radius:4px;cursor:pointer;font-size:14px;text-align:left;transition:border-color .2s}.filter-toggle:hover{border-color:var(--color-primary);background:#fff}.filter-list{position:absolute;top:calc(100% + 5px);left:0;right:0;background:#fff;border:1px solid #ddd;border-radius:4px;box-shadow:0 4px 8px #0000001a;max-height:200px;overflow-y:auto;z-index:1000}.filter-checkbox{display:flex;align-items:center;gap:8px;padding:8px 12px;cursor:pointer;transition:background .2s}.filter-checkbox:hover{background:var(--color-bg-light)}.filter-checkbox input[type=checkbox]{cursor:pointer}.color-indicator{width:16px;height:16px;border-radius:3px;display:inline-block;border:1px solid rgba(0,0,0,.1)}.instructor-item .workload{font-size:12px;color:var(--color-muted);font-weight:600}.course-item{cursor:grab;border:2px solid transparent;transition:all .2s}.course-item.course-scheduled{background:var(--color-scheduled-bg);border-color:var(--color-scheduled-br)}.course-item.course-unscheduled{background:var(--color-error-bg);border-color:var(--color-error-br)}.course-item.course-no-program{border-left:4px solid var(--color-danger)}.no-program-badge{font-size:14px;cursor:help}.course-item:hover{background:var(--color-hover-bg)!important;border-color:var(--color-primary)}.course-item.dragging{opacity:.5;cursor:grabbing}.course-info{display:flex;flex-direction:column}.course-name{font-weight:600;color:var(--color-dark)}.course-meta{font-size:12px;color:var(--color-muted)}.delete-btn{background:var(--color-danger);padding:4px 8px;font-size:12px}.delete-btn:hover{background:var(--color-danger-hover)}.schedule-area{flex:1;background:#fff;padding:20px;border-radius:8px;box-shadow:0 2px 4px #0000001a;overflow-x:auto}.schedule-area h2{font-size:18px;margin-bottom:15px;color:var(--color-dark)}#scheduleGrid{display:flex;flex-direction:column;gap:20px}.classroom-container{border:1px solid #ddd;border-radius:8px;overflow:hidden}.classroom-header{background:var(--color-dark-header);color:#fff;padding:12px 15px;display:flex;justify-content:space-between;align-items:center;cursor:pointer;-webkit-user-select:none;user-select:none}.classroom-header h3{font-size:16px;font-weight:600}.classroom-controls{display:flex;gap:10px;align-items:center}.toggle-btn{background:transparent;border:1px solid white;padding:4px 12px;font-size:12px}.toggle-btn:hover{background:#ffffff1a}.classroom-schedule{display:grid;grid-template-columns:100px repeat(6,1fr);border-top:1px solid #ddd}.classroom-schedule.hidden{display:none}.time-label,.day-header,.time-slot{padding:10px;border-right:1px solid #ddd;border-bottom:1px solid #ddd}.day-header{background:var(--color-bg-subtle);font-weight:600;text-align:center;font-size:14px}.time-label{background:var(--color-bg-light);font-size:13px;font-weight:500;display:flex;align-items:center}.time-slot{min-height:80px;background:#fff;position:relative;transition:background .2s}.time-slot.drag-over{background:var(--color-hover-bg);border:2px dashed var(--color-primary)}.time-slot.occupied{background:var(--color-bg-light);display:flex;flex-direction:column;gap:4px;padding:4px}.time-slot.arranged-slot{min-height:120px}.time-slot.conflict{background:var(--color-conflict-bg)}.time-slot.conflict .scheduled-course{background:linear-gradient(135deg,var(--color-danger) 0%,var(--color-danger-hover) 100%)}.scheduled-course{color:#fff;padding:8px;border-radius:4px;font-size:13px;min-height:60px;display:flex;flex-direction:column;justify-content:center;cursor:move;position:relative;flex-shrink:0;transition:opacity .3s ease}.scheduled-course:hover{opacity:.9}.scheduled-course .course-name{color:#fff;font-size:14px;margin-bottom:2px}.scheduled-course .course-meta{color:#ffffffe6}.scheduled-course .remove-course{position:absolute;top:4px;right:4px;background:#fff3;border:none;color:#fff;width:20px;height:20px;border-radius:50%;font-size:12px;padding:0;display:flex;align-items:center;justify-content:center;cursor:pointer}.scheduled-course .remove-course:hover{background:#ffffff4d}.timeslot-form-header{padding:12px 15px;background:var(--color-dark-header);color:#fff;cursor:pointer;-webkit-user-select:none;user-select:none;font-weight:600;font-size:14px;border-top:1px solid #ddd;transition:background .2s}.timeslot-form-header:hover{background:var(--color-dark)}.timeslot-form{padding:15px;background:var(--color-bg-light);border-top:1px solid #ddd}.timeslot-form h4{font-size:14px;margin-bottom:10px;color:var(--color-dark)}.timeslot-inputs{display:flex;gap:10px;margin-bottom:10px}.timeslot-inputs input{flex:1}.timeslots-list{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}.timeslot-tag{background:#fff;padding:6px 10px;border-radius:4px;font-size:12px;display:flex;align-items:center;gap:8px;border:1px solid #ddd}.timeslot-tag button{background:transparent;color:var(--color-danger);padding:0;font-size:14px;width:16px;height:16px;display:flex;align-items:center;justify-content:center}.timeslot-tag button:hover{color:var(--color-danger-hover)}.empty-state{text-align:center;padding:40px;color:var(--color-muted)}.empty-state p{margin-bottom:10px}.modal{display:none;position:fixed;z-index:1000;left:0;top:0;width:100%;height:100%;background-color:#00000080;animation:fadeIn .2s;overflow-y:auto}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.modal-content{background-color:#fff;margin:5% auto;padding:0;border-radius:8px;width:90%;max-width:500px;box-shadow:0 4px 20px #0000004d;animation:slideIn .3s}@keyframes slideIn{0%{transform:translateY(-50px);opacity:0}to{transform:translateY(0);opacity:1}}.modal-header{padding:20px;border-bottom:1px solid #ddd;display:flex;justify-content:space-between;align-items:center}.modal-header h2{margin:0;font-size:20px;color:var(--color-dark)}.close-modal{font-size:28px;font-weight:700;color:var(--color-muted);cursor:pointer;line-height:1}.close-modal:hover{color:var(--color-dark)}#editCourseForm,#editInstructorForm{padding:20px}.form-group{margin-bottom:15px}.form-group label{display:block;margin-bottom:5px;font-weight:600;color:var(--color-dark);font-size:14px}.modal-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:20px}.btn-primary,.btn-secondary{padding:10px 20px;border:none;border-radius:4px;cursor:pointer;font-size:14px;font-weight:600;transition:background .2s}.btn-primary{background:var(--color-primary);color:#fff}.btn-primary:hover{background:var(--color-primary-hover)}.btn-secondary{background:var(--color-bg-subtle);color:var(--color-dark)}.btn-secondary:hover{background:var(--color-btn-secondary-hv)}.modality-options{padding:30px;display:flex;justify-content:center;gap:20px}.modality-btn{flex:1;padding:20px;background:#fff;border:2px solid #ddd;border-radius:8px;cursor:pointer;transition:all .2s;display:flex;flex-direction:column;align-items:center;gap:10px;font-size:14px;font-weight:600;color:var(--color-dark)}.modality-btn:hover{border-color:var(--color-primary);background:var(--color-hover-bg);transform:translateY(-2px)}.modality-icon{font-size:32px}.modality-badge{display:inline-block;padding:2px 8px;border-radius:3px;font-size:11px;font-weight:600;margin-left:5px;background:#ffffff4d}.timeslot-day-section{margin-bottom:20px;padding:15px;background:var(--color-bg-light);border-radius:4px}.timeslot-day-section h5{font-size:13px;margin-bottom:10px;color:var(--color-dark);font-weight:600}.timeslot-day-section .timeslots-list{margin-top:10px}.day-timeslots{display:flex;flex-direction:column;gap:10px;margin-bottom:15px}.validation-summary{background:var(--color-warn-bg);border:1px solid var(--color-amber-light, #ffc107);border-radius:8px;margin-bottom:15px;overflow:hidden}.validation-header{display:flex;align-items:center;gap:8px;padding:12px 15px;cursor:pointer;-webkit-user-select:none;user-select:none;font-weight:600;font-size:14px;color:var(--color-amber-dark, #856404);transition:background .2s}.validation-header:hover{background:#0000000d}.validation-icon{font-size:12px;transition:transform .2s}.validation-title{flex:1}.validation-count{background:var(--color-danger);color:#fff;padding:2px 8px;border-radius:12px;font-size:12px;font-weight:700}.validation-errors{padding:0 15px 15px}.validation-errors.collapsed{display:none}.validation-error-item{display:flex;align-items:flex-start;gap:8px;padding:8px 12px;margin-bottom:6px;border-radius:4px;font-size:13px;line-height:1.4}.validation-error-item.instructor-conflict{background:var(--color-error-bg);border-left:3px solid var(--color-danger);color:var(--color-error-text)}.validation-error-item.cohort-conflict{background:var(--color-info-bg);border-left:3px solid var(--color-teal);color:var(--color-info-text)}.validation-error-item.program-conflict{background:var(--color-error-bg);border-left:3px solid var(--color-purple);color:var(--color-error-text)}.validation-error-item.quarter-conflict{background:var(--color-warn-bg);border-left:3px solid var(--color-amber);color:var(--color-amber-dark, #856404)}.validation-error-icon{font-size:16px;flex-shrink:0;margin-top:1px}.validation-error-text{flex:1}.validation-error-text strong{font-weight:700}.quarter-badge{display:inline-block;padding:1px 6px;border-radius:3px;font-size:10px;font-weight:700;margin-left:4px;background:#ffffff59;letter-spacing:.3px}.section-badge{display:inline-block;padding:1px 6px;border-radius:3px;font-size:11px;font-weight:700;margin-left:4px;background:#ffffff4d;letter-spacing:.3px}.modality-section-input{padding:15px 30px 0}.modality-section-input label{display:block;margin-bottom:5px;font-weight:600;color:var(--color-dark);font-size:14px}.modality-section-input input{width:100%;padding:8px 12px;border:1px solid #ddd;border-radius:4px;font-size:14px}.cohort-summary-controls{margin-bottom:15px}.timeslot-manager{border:1px solid #ddd;border-radius:8px;margin-bottom:20px;overflow:hidden}.timeslot-manager-header{padding:12px 15px;background:var(--color-dark-header);color:#fff;cursor:pointer;-webkit-user-select:none;user-select:none;font-weight:600;font-size:14px;transition:background .2s}.timeslot-manager-header:hover{background:var(--color-dark)}.timeslot-manager-body{padding:15px;background:var(--color-bg-light)}.timeslots-editable-list{display:flex;flex-direction:column;gap:6px;margin-bottom:10px}.timeslot-editable{display:flex;align-items:center;gap:8px;padding:6px 10px;background:#fff;border:1px solid #ddd;border-radius:4px;transition:border-color .2s,background .2s}.timeslot-editable.timeslot-overlap{border-color:var(--color-warning);background:var(--color-overlap-bg)}.timeslot-editable input[type=time]{padding:4px 6px;border:1px solid #ddd;border-radius:3px;font-size:13px;width:120px}.timeslot-separator{color:var(--color-muted);font-weight:600}.overlap-warning{font-size:16px;cursor:help}.timeslot-remove{background:transparent;color:var(--color-danger);padding:0;font-size:16px;width:22px;height:22px;display:flex;align-items:center;justify-content:center;border-radius:50%;border:1px solid transparent;transition:all .2s;margin-left:auto}.timeslot-remove:hover{color:var(--color-danger-hover);background:var(--color-remove-hover-bg);border-color:var(--color-danger)}.timeslot-add-row{display:flex;align-items:center;gap:8px}.timeslot-add-row input[type=time]{padding:4px 6px;border:1px solid #ddd;border-radius:3px;font-size:13px;width:120px}.time-label-overlap{background:var(--color-overlap-bg)!important;border-left:3px solid var(--color-warning)}.overlap-indicator{font-size:12px;cursor:help}#cohortSummaryBtn{padding:10px 20px;background:var(--color-primary);color:#fff;border:none;border-radius:6px;font-size:15px;font-weight:600;cursor:pointer;transition:background .2s,transform .1s}#cohortSummaryBtn:hover{background:var(--color-primary-hover);transform:translateY(-1px)}#cohortSummaryBtn:active{transform:translateY(0)}.cohort-summary-section{background:var(--color-bg-light);border-radius:8px;padding:20px;margin-bottom:25px;border:1px solid var(--color-border-subtle)}.cohort-name{color:var(--color-dark);font-size:22px;margin-bottom:12px;padding-bottom:10px;border-bottom:2px solid var(--color-primary)}.cohort-stats{display:flex;gap:30px;margin-bottom:20px;padding:12px;background:#fff;border-radius:6px;border-left:4px solid var(--color-primary)}.cohort-stat{font-size:15px;color:var(--color-scrollbar-hover, #555)}.cohort-stat strong{color:var(--color-dark);margin-right:5px}.cohort-classes-list{display:grid;gap:15px}.cohort-class{background:#fff;border-radius:6px;padding:15px;border:1px solid var(--color-border-card);transition:box-shadow .2s}.cohort-class:hover{box-shadow:0 2px 8px #0000001a}.cohort-class-name{font-size:17px;font-weight:600;color:var(--color-dark);margin-bottom:6px}.cohort-class-info{font-size:13px;color:var(--color-muted);margin-bottom:12px}.cohort-schedule-list{display:grid;gap:8px}.cohort-schedule-item{padding:8px 12px;background:var(--color-bg-light);border-radius:4px;font-size:14px;color:var(--color-text-body);border-left:3px solid var(--color-primary)}.cohort-schedule-item strong{color:var(--color-dark);min-width:100px;display:inline-block}.cohort-modality{margin-left:10px;font-size:13px;color:var(--color-text-muted2);font-weight:500}.instructor-rows{display:flex;flex-direction:column;gap:8px;margin-bottom:8px}.instructor-row{display:flex;align-items:center;gap:8px}.instructor-row .instructor-row-select{flex:1 1 auto;min-width:0}.instructor-row .instructor-row-credits{flex:0 0 90px;width:90px}.instructor-row-remove{flex:0 0 auto;background:var(--color-danger);color:#fff;border:none;border-radius:4px;width:28px;height:28px;font-size:18px;line-height:1;cursor:pointer}.instructor-row-remove:hover{background:var(--color-danger-hover)}.add-instructor-row-btn{font-size:13px;padding:6px 12px}.credits-summary{margin-top:8px;font-size:13px;font-weight:600;color:var(--color-muted)}.credits-summary-ok{color:var(--color-success)}.credits-summary-error{color:var(--color-danger)}