:root{--bg-dark:radial-gradient(circle at 10% 20%, #1e1e2d 0%, #0f0f19 90%);--bg-light:radial-gradient(circle at 10% 20%, #f0f5ff 0%, #dce6f5 90%);--text-dark:#ffffffde;--text-light:#14141ede;--panel-dark:#ffffff0d;--panel-light:#fff6;--border-dark:#ffffff1a;--border-light:#0000001f;--btn-secondary-dark:#ffffff1a;--btn-secondary-dark-hover:#fff3;--btn-secondary-light:#fff9;--btn-secondary-light-hover:#fff;--seat-dark:#ffffff14;--seat-light:#0000000d;--seat-hover-light:#00000026;--seat-hover-dark:#ffffff26;--seat-border-light:#00000026;--seat-border-dark:#fff3;font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;font-weight:400;line-height:1.5}body{width:100vw;min-height:100vh;margin:0;display:flex;overflow-x:hidden}#root{flex-direction:column;width:100%;height:100%;display:flex}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:#0000001a;border-radius:4px}::-webkit-scrollbar-thumb{background:#6464644d;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#64646480}.theme-dark{--bg:var(--bg-dark);--text:var(--text-dark);--panel:var(--panel-dark);--border:var(--border-dark);--btn-sec:var(--btn-secondary-dark);--btn-sec-hover:var(--btn-secondary-dark-hover);--seat:var(--seat-dark);--seat-hover:var(--seat-hover-dark);--seat-border:var(--seat-border-dark)}.theme-light{--bg:var(--bg-light);--text:var(--text-light);--panel:var(--panel-light);--border:var(--border-light);--btn-sec:var(--btn-secondary-light);--btn-sec-hover:var(--btn-secondary-light-hover);--seat:var(--seat-light);--seat-hover:var(--seat-hover-light);--seat-border:var(--seat-border-light)}.app-container{background:var(--bg);width:100vw;height:100vh;color:var(--text);flex-direction:column;transition:background .3s,color .3s;display:flex;position:relative;overflow:hidden}h1,h2,h3{letter-spacing:-.5px;margin:0;font-weight:600}button{background-color:var(--btn-sec);cursor:pointer;color:var(--text);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid #0000;border-radius:8px;padding:.6em 1.2em;font-family:inherit;font-size:1em;font-weight:500;transition:all .25s}button:hover{background-color:var(--btn-sec-hover);transform:translateY(-2px);box-shadow:0 5px 15px #0000001a}button:active{transform:translateY(0)}.glass-panel{background:var(--panel);-webkit-backdrop-filter:blur(10px);border:1px solid var(--border);border-radius:12px;transition:background .3s,border .3s;box-shadow:0 4px 20px #0000000d}.setup-overlay{-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:1000;background:#00000080;justify-content:center;align-items:center;width:100vw;height:100vh;display:flex;position:absolute;top:0;left:0}.setup-modal{text-align:center;flex-direction:column;gap:1.5rem;width:340px;padding:2.5rem;display:flex}.setup-title{background:linear-gradient(135deg,#a8edea 0%,#fed6e3 100%);-webkit-text-fill-color:transparent;-webkit-background-clip:text;margin-bottom:.5rem;font-size:1.8rem}.input-group{justify-content:space-between;align-items:center;display:flex}.input-group label{font-weight:500}.input-group input[type=number]{background:var(--btn-sec);border:1px solid var(--border);width:80px;color:var(--text);text-align:center;border-radius:6px;outline:none;padding:.5rem;font-size:1.1rem}.primary-btn{color:#fff;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);border:none;border-radius:8px;margin-top:1rem;padding:.8rem;font-size:1.2rem;box-shadow:0 4px 15px #764ba24d}.primary-btn:hover{color:#fff;background:linear-gradient(135deg,#764ba2 0%,#667eea 100%)}.btn-secondary{background:var(--btn-sec);border:1px solid var(--border)}.segmented-control{background:var(--bg);border:1px solid var(--border);border-radius:8px;align-items:center;gap:4px;padding:4px;display:inline-flex}.segment-btn{color:var(--text);opacity:.6;box-shadow:none;-webkit-backdrop-filter:none;backdrop-filter:none;background:0 0;border:1px solid #0000;border-radius:6px;padding:.4em .8em;font-size:.9rem;font-weight:500;transition:all .2s}.segment-btn:hover{box-shadow:none;opacity:.8;background:#8080801a;transform:none}.segment-btn.active{background:var(--panel);opacity:1;border-color:var(--border);font-weight:600;box-shadow:0 2px 8px #0000001a}.main-board{box-sizing:border-box;flex-direction:row;flex:1;gap:1rem;height:calc(100vh - 2rem);padding:1rem;display:flex}.left-sidebar{box-sizing:border-box;flex-direction:column;gap:1rem;height:100%;padding:1rem;display:flex}.sidebar-resizer{cursor:ew-resize;z-index:10;background:0 0;width:6px;height:100%;margin:0 -3px;transition:background .2s}.sidebar-resizer:hover,.sidebar-resizer.resizing{background:var(--border)}.sidebar-header{justify-content:space-between;align-items:center;display:flex}.sidebar-title{font-size:1.1rem;font-weight:600}.student-list{flex-flow:wrap;flex:1;align-content:flex-start;gap:.8rem;display:flex;overflow-y:auto}.right-content{flex-direction:column;flex:1;gap:1rem;display:flex;overflow:hidden}.top-action-bar{flex-wrap:nowrap;justify-content:flex-end;align-items:center;gap:.8rem;padding:1rem;display:flex;overflow-x:auto}.top-action-bar button{white-space:nowrap;flex-shrink:0}.top-action-bar button:not(.primary-btn){padding:.5em 1em;font-size:.9rem}.student-card{cursor:grab;flex-direction:column;align-items:center;gap:.3rem;width:75px;padding-bottom:5px;transition:transform .2s,opacity .2s;display:flex}.student-card:active{cursor:grabbing;transform:scale(.95)}.student-card.dragging{opacity:.5}.student-card.excluded-student{opacity:.6;border:1px dotted #ff646480}.exclude-toggle{color:var(--text);cursor:pointer;opacity:.7;align-items:center;gap:3px;font-size:.65rem;display:flex}.exclude-toggle input{cursor:pointer;margin:0}.student-photo{border:2px solid var(--border);background:var(--btn-sec);border-radius:6px;display:block}.student-name{text-align:center;white-space:nowrap;text-overflow:ellipsis;width:100%;font-size:.8rem;overflow:hidden}.seat-map-container{background:var(--panel);border:1px solid var(--border);border-radius:12px;flex-direction:column;flex:1;justify-content:safe center;align-items:safe center;padding:1rem;display:flex;position:relative;overflow:auto}.grid-wrapper{flex-direction:column;align-items:center;gap:2rem;display:flex}.seat-grid{justify-content:center;gap:1rem;display:grid}.seat{background:var(--seat);border:1px dashed var(--seat-border);cursor:pointer;border-radius:12px;flex-direction:column;justify-content:center;align-items:center;width:80px;height:90px;transition:all .2s;display:flex;position:relative}.seat:hover:not(.excluded){background:var(--seat-hover);border-color:var(--seat-border)}.seat.excluded{opacity:.5;cursor:not-allowed;background:#ff00001a;border:1px dashed #ff00004d}.seat.excluded:after{content:"X";color:#f006;font-size:3rem;font-weight:700;position:absolute}.seat.filled{cursor:default;background:#00ff801a;border:1px solid #00ff804d}.seat-number{color:var(--text);opacity:.5;font-size:.7rem;position:absolute;bottom:4px;right:6px}.teacher-desk{background:linear-gradient(to bottom, var(--btn-sec-hover), var(--btn-sec));letter-spacing:2px;border:2px solid var(--border);border-radius:8px;justify-content:center;align-items:center;width:240px;height:50px;font-weight:700;display:flex;box-shadow:0 4px 15px #0000001a}.remove-btn{color:#fff;cursor:pointer;z-index:100;opacity:0;pointer-events:none;background:#f00c;border:none;border-radius:50%;justify-content:center;align-items:center;width:24px;height:24px;font-size:12px;transition:transform .2s,background .2s,opacity .2s;display:flex;position:absolute;top:-8px;right:-8px}.seat:hover .remove-btn,.student-card:hover .remove-btn{opacity:1;pointer-events:auto}.remove-btn:hover{background:#ff3232;transform:scale(1.1)}@keyframes shufflePop{0%{opacity:1;transform:scale(1)}30%{opacity:.4;transform:scale(.75)rotate(-3deg)}70%{opacity:.6;transform:scale(.85)rotate(2deg)}to{opacity:1;transform:scale(1)}}.seat.shuffling .student-card{pointer-events:none;animation:.25s ease-in-out shufflePop}.seat.shuffling{border-color:#667eea80;box-shadow:0 0 12px #667eea40}@keyframes seatLand{0%{opacity:0;transform:scale(.6)rotate(-6deg)}50%{opacity:1;transform:scale(1.15)rotate(2deg)}75%{transform:scale(.95)}to{opacity:1;transform:scale(1)rotate(0)}}.seat.landed .student-card{animation:.45s cubic-bezier(.34,1.56,.64,1) seatLand}.seat.landed{border-color:#50fa7b80;transition:border-color .6s,box-shadow .6s;box-shadow:0 0 15px #50fa7b33}.add-student-btn{transition:all .25s;color:#50fa7b!important;border-color:#50fa7b!important;padding:.45em .9em!important;font-size:.85rem!important}.theme-light .add-student-btn{color:#27ae60!important;border-color:#27ae60!important}.add-student-btn:hover{box-shadow:0 0 12px #50fa7b33;background:#50fa7b26!important}@keyframes fadeSlideIn{0%{opacity:0;transform:translateY(-6px)scale(.95)}to{opacity:1;transform:translateY(0)scale(1)}}.reshuffle-btn{animation:.35s ease-out fadeSlideIn;box-shadow:0 4px 15px #6366f14d;background:linear-gradient(135deg,#4a6cf7 0%,#6366f1 100%)!important}.reshuffle-btn:hover{box-shadow:0 6px 20px #6366f166;background:linear-gradient(135deg,#6366f1 0%,#4a6cf7 100%)!important}button:disabled{opacity:.4;cursor:not-allowed;pointer-events:none;transform:none!important}.primary-btn:disabled{opacity:.35;filter:grayscale(.5)}.sidebar-header{flex-wrap:wrap;gap:.5rem}@page{margin:10mm}@media print{.app-container,.theme-dark,.theme-light{--bg:#fff!important;--text:#000!important;--panel:#fff!important;--border:#ccc!important;--seat:#f8f9fa!important;--seat-border:#999!important}.left-sidebar,.sidebar-resizer,.top-action-bar,.remove-btn,.setup-overlay{display:none!important}#root,.app-container,.main-board,.right-content,.seat-map-container{display:contents!important}html{background:#fff!important}body{all:unset!important;color:#000!important;background:#fff!important;justify-content:center!important;align-items:center!important;min-height:100vh!important;margin:0!important;padding:0!important;display:flex!important}.grid-wrapper{page-break-inside:avoid;break-inside:avoid;flex-direction:column!important;align-items:center!important;gap:2rem!important;margin:0 auto!important;padding:0!important;display:flex!important;transform:none!important}.seat{-webkit-print-color-adjust:exact!important;print-color-adjust:exact!important;background:#f8f9fa!important;border:1px solid #999!important}.teacher-desk{color:#000!important;-webkit-print-color-adjust:exact!important;print-color-adjust:exact!important;background:#f0f0f0!important;border:2px solid #999!important}.glass-panel{-webkit-backdrop-filter:none!important;box-shadow:none!important}}.excel-upload-btn:hover{background:#4bc0c026!important;box-shadow:0 0 12px #4bc0c033!important}