*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #f5f3ff;--bg2: #ede9fe;--surface: #ffffff;--primary: #6366f1;--primary-h: #4f46e5;--primary-lt: #ede9fe;--success: #22c55e;--success-lt: #dcfce7;--danger: #ef4444;--danger-lt: #fee2e2;--warning: #f59e0b;--warning-lt: #fef3c7;--muted: #94a3b8;--border: #e2e8f0;--text: #1e293b;--radius: 16px;--radius-sm: 10px;--shadow: 0 4px 24px rgba(99,102,241,.1);--shadow-md: 0 8px 32px rgba(99,102,241,.16);--s1: #6366f1;--s1-lt: #ede9fe;--s2: #f59e0b;--s2-lt: #fef3c7;--s3: #14b8a6;--s3-lt: #ccfbf1;--s4: #f43f5e;--s4-lt: #ffe4e6}html,body{height:100%;font-family:Nunito,-apple-system,BlinkMacSystemFont,sans-serif;background:var(--bg);color:var(--text);font-size:16px;line-height:1.5}#root{min-height:100vh;display:flex;flex-direction:column}@keyframes fade-up{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}@keyframes pop-in{0%{transform:scale(.85);opacity:0}65%{transform:scale(1.05)}to{transform:scale(1);opacity:1}}@keyframes correct-pop{0%{transform:scale(1)}40%{transform:scale(1.12)}to{transform:scale(1)}}@keyframes wrong-shake{0%,to{transform:translate(0)}20%{transform:translate(-7px)}40%{transform:translate(7px)}60%{transform:translate(-5px)}80%{transform:translate(5px)}}@keyframes star-entrance{0%{transform:scale(0) rotate(-20deg);opacity:0}60%{transform:scale(1.15) rotate(5deg)}to{transform:scale(1) rotate(0);opacity:1}}@keyframes pulse-ring{0%{box-shadow:0 0 #6366f159}70%{box-shadow:0 0 0 14px #6366f100}to{box-shadow:0 0 #6366f100}}@keyframes timer-urgent{0%,to{opacity:1}50%{opacity:.55}}@keyframes unlock-slide{0%{transform:translateY(-8px);opacity:0}to{transform:translateY(0);opacity:1}}.animate-fade-up{animation:fade-up .35s ease both}.animate-pop-in{animation:pop-in .4s cubic-bezier(.34,1.56,.64,1) both}.animate-correct{animation:correct-pop .35s ease both}.animate-wrong{animation:wrong-shake .4s ease both}.center-screen{flex:1;display:flex;align-items:center;justify-content:center;padding:1.5rem;min-height:100vh}.card{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);padding:2rem;width:100%;max-width:480px;display:flex;flex-direction:column;align-items:center;gap:.85rem;text-align:center;animation:fade-up .35s ease both}.section-screen{flex:1;display:flex;flex-direction:column;min-height:100vh}h1{font-size:2rem;font-weight:800}h2{font-size:1.5rem;font-weight:800}h3{font-size:1.1rem;font-weight:700;margin-bottom:.5rem}h4{font-size:.95rem;font-weight:700}.title{font-size:2.5rem;font-weight:900;color:var(--primary);letter-spacing:-.02em}.subtitle{font-size:1.15rem;color:var(--muted);font-weight:600}.muted{color:var(--muted)}.small{font-size:.85rem}.error{color:var(--danger);font-size:.9rem;font-weight:600}.success-msg{color:#166534;background:var(--success-lt);border:1.5px solid #86efac;border-radius:var(--radius-sm);padding:.5rem .85rem;font-size:.9rem;font-weight:600}p{color:var(--muted);font-weight:600}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.4rem;border:none;border-radius:var(--radius-sm);padding:.75rem 1.5rem;font-family:inherit;font-size:1rem;font-weight:700;cursor:pointer;transition:transform .15s,box-shadow .15s,background .15s;text-decoration:none}.btn:active:not(:disabled){transform:scale(.95)!important}.btn:disabled{opacity:.45;cursor:default}.btn-primary{background:var(--primary);color:#fff;box-shadow:0 4px 14px #6366f159}.btn-primary:hover:not(:disabled){background:var(--primary-h);transform:translateY(-2px);box-shadow:0 6px 20px #6366f166}.btn-ghost{background:transparent;color:var(--primary);border:2px solid var(--border)}.btn-ghost:hover{background:var(--primary-lt);border-color:var(--primary)}.btn-danger{background:var(--danger-lt);color:var(--danger);border:none}.btn-danger:hover{background:#fecaca}.btn-student{background:var(--surface);border:2.5px solid var(--border);border-radius:var(--radius);padding:1rem 1.25rem;width:100%;display:flex;align-items:center;gap:1rem;text-align:left;transition:border-color .15s,box-shadow .15s,transform .15s;cursor:pointer;font-family:inherit}.btn-student:hover{border-color:var(--primary);box-shadow:var(--shadow);transform:translateY(-2px)}.btn-student .student-name{font-size:1.1rem;font-weight:800;color:var(--text)}.btn-option{background:var(--surface);color:var(--text);border:2.5px solid var(--border);font-family:inherit;font-size:clamp(1.4rem,5vw,2rem);font-weight:800;padding:1.1rem;border-radius:var(--radius);transition:border-color .12s,background .12s,transform .12s,box-shadow .12s;box-shadow:0 2px 8px #0000000f;cursor:pointer}.btn-option:hover:not(:disabled){border-color:var(--primary);background:var(--primary-lt);transform:translateY(-3px);box-shadow:0 6px 16px #6366f133}.btn-option.locked{opacity:.45;cursor:default}.btn-option.correct{background:var(--success-lt);border-color:var(--success);color:#166534;animation:correct-pop .35s ease both}.btn-option.wrong{background:var(--danger-lt);border-color:var(--danger);color:#991b1b;animation:wrong-shake .4s ease both}.btn-option.dimmed{opacity:.3}.btn-step{padding:.35rem .85rem;font-size:.9rem;font-weight:700;border:2px solid var(--border);border-radius:999px}.btn-step.active{background:var(--primary);color:#fff;border-color:var(--primary)}.btn-step:hover:not(.active){border-color:var(--primary)}.btn.small{padding:.35rem .75rem;font-size:.85rem}.select-card{max-width:500px}.student-grid{display:flex;flex-direction:column;gap:.6rem;width:100%;margin:.5rem 0}.avatar{width:44px;height:44px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1rem;font-weight:900;flex-shrink:0}.teacher-link{margin-top:.75rem;font-size:.85rem;color:var(--muted);border-color:transparent}.teacher-link:hover{color:var(--primary);background:var(--primary-lt);border-color:transparent}.section-header{display:flex;align-items:center;gap:1rem;padding:.9rem 1.5rem;background:var(--surface);border-bottom:1px solid var(--border);flex-wrap:wrap;box-shadow:0 2px 8px #0000000d}.section-badge{font-size:.82rem;font-weight:800;padding:.3rem .85rem;border-radius:999px;letter-spacing:.01em}.section-badge.s1{background:var(--s1-lt);color:var(--s1)}.section-badge.s2{background:var(--s2-lt);color:#92400e}.section-badge.s3{background:var(--s3-lt);color:#115e59}.section-badge.s4{background:var(--s4-lt);color:#be123c}.timer{font-size:1.4rem;font-weight:900;color:var(--text);min-width:3rem;font-variant-numeric:tabular-nums}.timer.urgent{color:var(--danger);animation:timer-urgent 1s infinite}.score-display{font-size:1rem;font-weight:800;color:var(--muted);margin-left:auto}.timer-bar{height:6px;background:var(--border)}.timer-bar-fill{height:100%;transition:width 1s linear,background-color 1s ease;border-radius:0 3px 3px 0}.timer-bar-fill.plenty{background:var(--success)}.timer-bar-fill.getting-low{background:var(--warning)}.timer-bar-fill.urgent{background:var(--danger)}.question-card{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:2rem 1.5rem;gap:1.75rem}.progress-indicator{font-size:.85rem;color:var(--muted);font-weight:700;background:var(--bg2);padding:.25rem .75rem;border-radius:999px}.question-display{font-size:clamp(2.2rem,10vw,4rem);font-weight:900;color:var(--text);text-align:center;letter-spacing:-.02em;animation:fade-up .3s ease both}.skip-prompt{font-size:1rem;color:var(--muted);font-weight:700}.options-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:.85rem;width:100%;max-width:500px}.waiting-hint{font-size:.85rem;color:var(--muted);font-weight:700;font-style:italic;animation:timer-urgent 1.2s infinite}.summary-card{gap:1.1rem;animation:pop-in .45s cubic-bezier(.34,1.56,.64,1) both}.stats-row{display:flex;gap:1.5rem;justify-content:center;background:var(--bg);border-radius:var(--radius);padding:1rem 1.5rem;width:100%}.stat{display:flex;flex-direction:column;align-items:center;gap:.1rem}.stat-value{font-size:2.2rem;font-weight:900;color:var(--primary);line-height:1}.stat-label{font-size:.75rem;color:var(--muted);font-weight:700;text-transform:uppercase;letter-spacing:.06em}.unlock-banner{background:var(--warning-lt);color:#78350f;border:2px solid #fcd34d;border-radius:var(--radius-sm);padding:.6rem 1rem;font-size:.95rem;font-weight:800;width:100%;text-align:center;animation:unlock-slide .4s ease both}.unlock-banner.complete{background:var(--success-lt);color:#166534;border-color:#86efac}.complete-icon{font-size:3.5rem;width:6rem;height:6rem;border-radius:50%;display:flex;align-items:center;justify-content:center;background:var(--success-lt);border:3px solid #86efac;animation:star-entrance .5s cubic-bezier(.34,1.56,.64,1) both}.step-selector{display:flex;align-items:center;gap:.5rem;flex-wrap:wrap;justify-content:center}.section-icon{font-size:2.8rem;animation:star-entrance .5s cubic-bezier(.34,1.56,.64,1) both}.teacher-panel{min-height:100vh;background:var(--bg)}.teacher-header{display:flex;align-items:center;justify-content:space-between;padding:1.1rem 1.5rem;background:var(--surface);border-bottom:1px solid var(--border);box-shadow:0 2px 8px #0000000d}.teacher-header h1{font-size:1.3rem;font-weight:800}.tabs{display:flex;background:var(--surface);border-bottom:1px solid var(--border);padding:0 1.5rem}.tab{padding:.8rem 1.25rem;background:none;border:none;border-bottom:3px solid transparent;font-family:inherit;font-size:.95rem;font-weight:700;color:var(--muted);cursor:pointer;transition:color .15s}.tab.active{color:var(--primary);border-bottom-color:var(--primary)}.tab:hover:not(.active){color:var(--text)}.tab-content{padding:1.5rem;max-width:860px}.add-student-form{display:flex;gap:.75rem;margin-bottom:1.5rem}.input{padding:.65rem .9rem;border:2px solid var(--border);border-radius:var(--radius-sm);font-family:inherit;font-size:.95rem;font-weight:600;flex:1;outline:none;background:var(--surface);color:var(--text);transition:border-color .15s}.input:focus{border-color:var(--primary)}.input.small{padding:.35rem .6rem;font-size:.85rem;width:80px;flex:none}.student-row{background:var(--surface);border:2px solid var(--border);border-radius:var(--radius);padding:.9rem 1rem;margin-bottom:.6rem;transition:border-color .15s}.student-row:hover{border-color:var(--bg2)}.student-row-main{display:flex;flex-direction:column;gap:.2rem;margin-bottom:.5rem}.student-row-actions{display:flex;gap:.4rem;flex-wrap:wrap}.recent-sessions{margin-top:.75rem}.recent-sessions summary{cursor:pointer;font-weight:700;color:var(--muted);font-size:.85rem}.data-table{width:100%;border-collapse:collapse;font-size:.85rem;margin-top:.5rem}.data-table th,.data-table td{text-align:left;padding:.3rem .5rem;border-bottom:1px solid var(--border)}.data-table th{color:var(--muted);font-weight:700}.continuum-textarea{width:100%;font-family:monospace;font-size:.9rem;padding:.75rem;border:2px solid var(--border);border-radius:var(--radius-sm);resize:vertical;outline:none;margin:.75rem 0;transition:border-color .15s}.continuum-textarea:focus{border-color:var(--primary)}.continuum-preview{display:flex;flex-wrap:wrap;gap:.4rem;margin-top:.5rem}.continuum-item{font-size:.82rem;padding:.2rem .5rem;border-radius:5px;font-family:monospace;font-weight:600}.continuum-item.fact{background:var(--primary-lt);color:var(--primary)}.continuum-item.skip_unlock{background:var(--warning-lt);color:#78350f}.continuum-list{display:flex;flex-direction:column;border:1px solid var(--border);border-radius:8px;overflow:hidden;max-height:480px;overflow-y:auto}.continuum-row{display:flex;align-items:center;gap:.75rem;padding:.35rem .75rem;border-bottom:1px solid var(--border);font-size:.88rem}.continuum-row:last-child{border-bottom:none}.continuum-row.fact{background:#fff}.continuum-row.skip_unlock{background:#fffbeb}.continuum-row-num{font-size:.75rem;color:var(--muted);min-width:2rem;text-align:right;-webkit-user-select:none;user-select:none}.continuum-row-content{font-family:monospace;font-weight:600;color:var(--text)}.continuum-row.skip_unlock .continuum-row-content{color:#92400e}.code-block{background:var(--bg);border:2px solid var(--border);border-radius:var(--radius-sm);padding:.75rem;font-size:.85rem;margin-top:.5rem;white-space:pre}.settings-field{display:flex;align-items:center;gap:1rem;margin-bottom:.75rem}.settings-field span{min-width:280px;font-size:.9rem;font-weight:600;color:var(--text)}.settings-field .input{max-width:120px;flex:none}.export-section{margin-bottom:1.25rem}.export-label{display:block;font-size:.8rem;font-weight:800;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);margin-bottom:.5rem}.export-type-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:.6rem}.export-type-btn{display:flex;flex-direction:column;align-items:flex-start;gap:.2rem;padding:.85rem 1rem;background:var(--surface);border:2px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;font-family:inherit;text-align:left;transition:border-color .15s,background .15s}.export-type-btn:hover,.export-type-btn.active{border-color:var(--primary);background:var(--primary-lt)}.export-type-icon{font-size:1.4rem}.export-type-name{font-size:.9rem;font-weight:800;color:var(--text)}.export-type-desc{font-size:.78rem;color:var(--muted);font-weight:600;line-height:1.3}.export-filters{display:flex;flex-direction:column;gap:.6rem}.filter-field{display:flex;align-items:center;gap:.75rem;font-size:.9rem;font-weight:600}.filter-field span{min-width:60px;color:var(--text)}.filter-field select{flex:1;max-width:240px}.filter-field input[type=date]{flex:1;max-width:180px}.checkbox-field{gap:.5rem}.checkbox-field input[type=checkbox]{width:1rem;height:1rem;cursor:pointer}.date-presets{display:flex;gap:.4rem;flex-wrap:wrap;padding-left:60px}.preview-table-wrap{overflow-x:auto;border:2px solid var(--border);border-radius:var(--radius-sm)}.preview-table{min-width:600px;font-size:.82rem}.preview-table th{background:var(--bg);white-space:nowrap;font-size:.78rem;padding:.45rem .6rem}.preview-table td{padding:.4rem .6rem;white-space:nowrap}.preview-table tbody tr:hover{background:var(--bg)}@media(max-width:600px){.options-grid{gap:.6rem}.question-display{font-size:2.4rem}.stats-row{gap:1rem;padding:.75rem 1rem}.stat-value{font-size:1.8rem}.settings-field{flex-direction:column;align-items:flex-start;gap:.3rem}.settings-field span{min-width:unset}.section-header{padding:.75rem 1rem;gap:.6rem}}