:root{--color-bg-primary: #F5F5F7;--color-bg-secondary: #FFFFFF;--color-bg-subtle: #E8E8ED;--color-text-primary: #1D1D1F;--color-text-secondary: #6E6E73;--color-accent-primary: #0071E3;--color-accent-hover: #0077ED;--color-correct: #34C759;--color-wrong: #FF3B30;--color-timer: #FF9500;--color-amber: #FF9500;--color-gold: #D4A843;--font-title: "Bebas Neue", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-body: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--space-xs: 4px;--space-sm: 8px;--space-md: 16px;--space-lg: 24px;--space-xl: 32px;--space-2xl: 48px;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 20px;--radius-full: 9999px;--shadow-soft: 0 1px 3px rgba(0, 0, 0, .04), 0 1px 2px rgba(0, 0, 0, .06);--shadow-medium: 0 4px 6px rgba(0, 0, 0, .04), 0 2px 4px rgba(0, 0, 0, .06);--shadow-strong: 0 10px 25px rgba(0, 0, 0, .08), 0 4px 10px rgba(0, 0, 0, .06);--shadow-card: 0 2px 8px rgba(0, 0, 0, .04), 0 1px 3px rgba(0, 0, 0, .06);--transition-fast: .15s ease;--transition-medium: .25s ease}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-body);background:var(--color-bg-primary);color:var(--color-text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.hidden{display:none!important}.classroom-wrapper{max-width:1200px;margin:0 auto;padding:var(--space-md);padding-bottom:var(--space-2xl)}.classroom-header{display:flex;align-items:center;justify-content:space-between;padding:var(--space-md) 0;margin-bottom:var(--space-md);border-bottom:1px solid var(--color-bg-subtle)}.header-left{display:flex;align-items:baseline;gap:var(--space-md)}.logo{font-family:var(--font-title);font-size:28px;letter-spacing:1px;line-height:1}.logo-mind,.logo-sprint{color:#2b6cb0}.logo-classroom{color:var(--color-text-secondary);font-size:22px;margin-left:4px}.back-link{font-size:14px;color:var(--color-accent-primary);text-decoration:none;transition:color var(--transition-fast)}.back-link:hover{color:var(--color-accent-hover)}.mode-toggle{display:flex;align-items:center;gap:var(--space-sm)}.mode-label{font-size:13px;font-weight:600;color:var(--color-text-secondary)}.toggle-btn{position:relative;width:48px;height:28px;background:var(--color-correct);border:none;border-radius:var(--radius-full);cursor:pointer;transition:background var(--transition-medium);padding:0}.toggle-btn[aria-checked=false]{background:var(--color-accent-primary)}.toggle-thumb{position:absolute;top:3px;left:3px;width:22px;height:22px;background:#fff;border-radius:50%;transition:transform var(--transition-medium);box-shadow:0 1px 3px #0003}.toggle-btn[aria-checked=false] .toggle-thumb{transform:translate(20px)}.classroom-info-bar{display:flex;align-items:center;justify-content:space-between;background:var(--color-bg-secondary);border-radius:var(--radius-lg);padding:var(--space-md) var(--space-lg);box-shadow:var(--shadow-card);margin-bottom:var(--space-lg)}.classroom-info-left{display:flex;align-items:baseline;gap:var(--space-md)}.classroom-name{font-size:18px;font-weight:700;color:var(--color-text-primary)}.classroom-detail{font-size:14px;color:var(--color-text-secondary)}.classroom-info-right{display:flex;align-items:center;gap:var(--space-sm)}.join-code-label{font-size:12px;font-weight:600;color:var(--color-text-secondary);text-transform:uppercase;letter-spacing:.5px}.join-code-value{font-family:var(--font-title);font-size:20px;color:var(--color-accent-primary);letter-spacing:1px}.join-code-copy{font-family:var(--font-body);font-size:12px;font-weight:600;padding:4px 10px;background:var(--color-accent-primary);color:#fff;border:none;border-radius:var(--radius-sm);cursor:pointer;transition:background var(--transition-fast)}.join-code-copy:hover{background:var(--color-accent-hover)}.metrics-row{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--space-md);margin-bottom:var(--space-xl)}.metric-card{background:var(--color-bg-secondary);border-radius:var(--radius-lg);padding:var(--space-lg);box-shadow:var(--shadow-card);text-align:center;transition:box-shadow var(--transition-medium)}.metric-card:hover{box-shadow:var(--shadow-medium)}.metric-value{font-family:var(--font-title);font-size:36px;color:var(--color-text-primary);line-height:1.1;letter-spacing:.5px}.metric-subtitle{font-size:12px;font-weight:600;color:var(--color-text-secondary);margin-top:var(--space-xs);text-transform:uppercase;letter-spacing:.5px}.content-grid{display:grid;grid-template-columns:1fr 320px;gap:var(--space-lg);margin-bottom:var(--space-xl)}.roster-section{background:var(--color-bg-secondary);border-radius:var(--radius-lg);padding:var(--space-lg);box-shadow:var(--shadow-card);overflow:hidden}.roster-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--space-md)}.section-title{font-family:var(--font-body);font-size:18px;font-weight:700;color:var(--color-text-primary);margin-bottom:0}.roster-search-wrap{flex-shrink:0}.roster-search{font-family:var(--font-body);font-size:14px;padding:6px 12px;border:1px solid var(--color-bg-subtle);border-radius:var(--radius-sm);background:var(--color-bg-primary);color:var(--color-text-primary);outline:none;width:200px;transition:border-color var(--transition-fast)}.roster-search:focus{border-color:var(--color-accent-primary)}.roster-table-wrap{overflow-x:auto}.roster-table{width:100%;border-collapse:collapse;font-size:14px}.roster-table th{text-align:left;padding:10px 12px;font-size:11px;font-weight:700;color:var(--color-text-secondary);text-transform:uppercase;letter-spacing:.5px;border-bottom:2px solid var(--color-bg-subtle);white-space:nowrap;-webkit-user-select:none;user-select:none}.roster-table th.sortable{cursor:pointer;transition:color var(--transition-fast)}.roster-table th.sortable:hover,.roster-table th.active{color:var(--color-accent-primary)}.roster-table th.sort-asc:after{content:" ▲";font-size:9px}.roster-table th.sort-desc:after{content:" ▼";font-size:9px}.roster-table td{padding:10px 12px;border-bottom:1px solid var(--color-bg-subtle);white-space:nowrap}.roster-row{cursor:pointer;transition:background var(--transition-fast)}.roster-row:hover{background:#0071e30a}.roster-row.row-star{background:#34c7590f}.roster-row.row-star:hover{background:#34c7591a}.roster-row.row-attention{background:#ff95000f}.roster-row.row-attention:hover{background:#ff95001a}.col-rank{width:40px;text-align:center;color:var(--color-text-secondary);font-weight:700}.col-name{display:flex;align-items:center;gap:var(--space-sm);font-weight:600}.roster-avatar{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:50%;background:var(--color-bg-subtle);font-size:14px;font-weight:700;color:var(--color-accent-primary);flex-shrink:0}.brain-pill{display:inline-block;background:linear-gradient(135deg,#0071e3,#5e5ce6);color:#fff;font-family:var(--font-title);font-size:16px;padding:2px 10px;border-radius:var(--radius-full);letter-spacing:.5px;line-height:1.4}.trend-up-icon{color:var(--color-correct);font-size:12px}.trend-down-icon{color:var(--color-wrong);font-size:12px}.trend-stable-icon{color:var(--color-text-secondary);font-size:12px}.roster-cards{display:flex;flex-direction:column;gap:var(--space-sm)}.roster-card{background:var(--color-bg-primary);border-radius:var(--radius-md);padding:var(--space-md);cursor:pointer;transition:background var(--transition-fast)}.roster-card:hover{background:var(--color-bg-subtle)}.roster-card.row-star{border-left:3px solid var(--color-correct)}.roster-card.row-attention{border-left:3px solid var(--color-amber)}.roster-card-top{display:flex;align-items:center;gap:var(--space-sm);margin-bottom:var(--space-sm)}.roster-card-rank{font-size:12px;font-weight:700;color:var(--color-text-secondary);min-width:28px}.roster-card-info{flex:1;min-width:0}.roster-card-name{font-size:15px;font-weight:700;color:var(--color-text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.roster-card-games{font-size:12px;color:var(--color-text-secondary)}.roster-card-stats{display:flex;gap:var(--space-md);font-size:12px;color:var(--color-text-secondary);font-weight:600}.attention-panel{display:flex;flex-direction:column;gap:var(--space-md)}.attention-section{background:var(--color-bg-secondary);border-radius:var(--radius-lg);padding:var(--space-lg);box-shadow:var(--shadow-card)}.attention-title{font-size:14px;font-weight:700;text-transform:uppercase;letter-spacing:.5px;margin-bottom:var(--space-md);padding-bottom:var(--space-sm);border-bottom:2px solid}.attention-title--amber{color:var(--color-amber);border-color:var(--color-amber)}.attention-title--gold{color:var(--color-gold);border-color:var(--color-gold)}.attention-title--green{color:var(--color-correct);border-color:var(--color-correct)}.attention-list{display:flex;flex-direction:column;gap:var(--space-sm)}.attention-item{padding:var(--space-sm) var(--space-md);border-radius:var(--radius-sm);border-left:3px solid transparent}.attention-item--amber{background:#ff95000f;border-left-color:var(--color-amber)}.attention-item--gold{background:#d4a8430f;border-left-color:var(--color-gold)}.attention-item--green{background:#34c7590f;border-left-color:var(--color-correct)}.attention-item-name{font-size:14px;font-weight:700;color:var(--color-text-primary);margin-bottom:2px}.attention-item-detail{font-size:12px;color:var(--color-text-secondary);line-height:1.4}.attention-badge{display:inline-block;font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.5px;padding:1px 6px;border-radius:var(--radius-full);background:var(--color-gold);color:#fff;margin-left:4px;vertical-align:middle}.attention-empty{font-size:13px;color:var(--color-text-secondary);font-style:italic}.chart-section{background:var(--color-bg-secondary);border-radius:var(--radius-lg);padding:var(--space-lg);box-shadow:var(--shadow-card);margin-bottom:var(--space-xl)}.chart-section .section-title{margin-bottom:var(--space-md)}.chart-container{position:relative;height:300px}.quick-actions{margin-bottom:var(--space-xl)}.quick-actions .section-title{margin-bottom:var(--space-md)}.actions-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--space-md)}.action-card{background:var(--color-bg-secondary);border-radius:var(--radius-lg);padding:var(--space-lg);box-shadow:var(--shadow-card);text-align:center}.action-icon{font-size:28px;margin-bottom:var(--space-sm);color:var(--color-accent-primary)}.action-name{font-size:16px;font-weight:700;color:var(--color-text-primary);margin-bottom:var(--space-xs)}.action-desc{font-size:13px;color:var(--color-text-secondary);margin-bottom:var(--space-md)}.btn-action{font-family:var(--font-body);font-size:13px;font-weight:600;padding:8px 20px;border:1px solid var(--color-bg-subtle);border-radius:var(--radius-sm);background:var(--color-bg-primary);color:var(--color-text-secondary);cursor:not-allowed}.action-join-code{display:flex;align-items:center;justify-content:center;gap:var(--space-sm);margin-top:var(--space-sm)}.action-code-value{font-family:var(--font-title);font-size:22px;color:var(--color-accent-primary);letter-spacing:1px}.action-code-copy{font-family:var(--font-body);font-size:12px;font-weight:600;padding:4px 10px;background:var(--color-accent-primary);color:#fff;border:none;border-radius:var(--radius-sm);cursor:pointer;transition:background var(--transition-fast)}.action-code-copy:hover{background:var(--color-accent-hover)}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000;padding:var(--space-md);animation:fadeIn .2s ease}.modal-overlay.hidden{display:none}.modal{background:var(--color-bg-secondary);border-radius:var(--radius-xl);box-shadow:var(--shadow-strong);max-height:90vh;overflow-y:auto;position:relative;animation:slideUp .25s ease}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}.modal-close{position:absolute;top:12px;right:16px;background:none;border:none;font-size:24px;color:var(--color-text-secondary);cursor:pointer;width:36px;height:36px;display:flex;align-items:center;justify-content:center;border-radius:50%;transition:background var(--transition-fast);z-index:1}.modal-close:hover{background:var(--color-bg-subtle)}.report-modal{width:440px;max-width:100%;padding:0;overflow:hidden}.report-card{padding:var(--space-xl);background:linear-gradient(180deg,#f5f5f7,#fff)}.report-header{display:flex;align-items:center;gap:var(--space-md);margin-bottom:var(--space-lg)}.report-avatar{width:56px;height:56px;border-radius:50%;background:var(--color-bg-subtle);display:flex;align-items:center;justify-content:center;font-size:26px;font-weight:700;color:var(--color-accent-primary);flex-shrink:0}.report-identity{flex:1;min-width:0}.report-name{font-size:20px;font-weight:800;color:var(--color-text-primary)}.report-subtitle{font-size:12px;color:var(--color-text-secondary);font-weight:600;text-transform:uppercase;letter-spacing:.5px}.report-brain-score{position:relative;width:80px;height:80px;flex-shrink:0}.score-ring{width:100%;height:100%;transform:rotate(-90deg)}.score-ring-bg{fill:none;stroke:var(--color-bg-subtle);stroke-width:8}.score-ring-fill{fill:none;stroke:url(#studentScoreGradient);stroke-width:8;stroke-linecap:round;stroke-dasharray:326.73;stroke-dashoffset:326.73;transition:stroke-dashoffset 1s ease-out}.score-ring-text{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center}.score-ring-value{font-family:var(--font-title);font-size:22px;line-height:1;color:var(--color-text-primary)}.score-ring-label{font-size:9px;font-weight:700;text-transform:uppercase;color:var(--color-text-secondary);letter-spacing:.5px}.report-scouting{background:var(--color-bg-primary);border-radius:var(--radius-md);padding:var(--space-md);margin-bottom:var(--space-md);font-size:14px;line-height:1.6;color:var(--color-text-primary);font-style:italic;border-left:3px solid var(--color-accent-primary)}.training-recommendation{background:#0071e30d;border-radius:var(--radius-md);padding:var(--space-md);margin-bottom:var(--space-lg);border-left:3px solid var(--color-accent-primary)}.training-rec-header{font-size:13px;font-weight:700;color:var(--color-accent-primary);text-transform:uppercase;letter-spacing:.3px;margin-bottom:var(--space-xs)}.training-rec-text{font-size:14px;line-height:1.5;color:var(--color-text-primary)}.report-stats-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--space-sm);margin-bottom:var(--space-lg)}.report-stat-item{background:var(--color-bg-primary);border-radius:var(--radius-md);padding:var(--space-md);text-align:center}.report-stat-value{font-family:var(--font-title);font-size:28px;line-height:1;color:var(--color-text-primary)}.report-stat-label{font-size:11px;font-weight:600;color:var(--color-text-secondary);text-transform:uppercase;letter-spacing:.3px;margin-top:2px}.report-sparkline-row{margin-bottom:var(--space-lg)}.report-sparkline-label{font-size:12px;font-weight:600;color:var(--color-text-secondary);text-transform:uppercase;letter-spacing:.3px;display:block;margin-bottom:var(--space-xs)}.report-sparkline{height:48px}.report-sparkline svg{width:100%;height:100%}.sparkline-line{fill:none;stroke:var(--color-accent-primary);stroke-width:2;stroke-linecap:round;stroke-linejoin:round}.sparkline-area{fill:#0071e314}.report-footer{display:flex;justify-content:space-between;align-items:center;padding-top:var(--space-md);border-top:1px solid var(--color-bg-subtle)}.report-brand{font-family:var(--font-title);font-size:14px;color:#2b6cb0;letter-spacing:.5px}.report-date{font-size:12px;color:var(--color-text-secondary)}.classroom-footer{text-align:center;padding:var(--space-lg) 0;border-top:1px solid var(--color-bg-subtle)}.classroom-footer p{font-size:13px;color:var(--color-text-secondary)}@media (max-width: 900px){.content-grid{grid-template-columns:1fr}.attention-panel{flex-direction:row;flex-wrap:wrap}.attention-section{flex:1;min-width:200px}.metrics-row{grid-template-columns:repeat(2,1fr)}.col-hide-tablet{display:none}.actions-grid{grid-template-columns:1fr 1fr}.classroom-info-bar{flex-direction:column;gap:var(--space-sm);align-items:flex-start}}@media (max-width: 600px){.classroom-wrapper{padding:var(--space-sm)}.classroom-header{flex-direction:column;align-items:flex-start;gap:var(--space-sm)}.header-right{align-self:flex-end}.header-left{flex-direction:column;gap:var(--space-xs)}.logo{font-size:24px}.logo-classroom{font-size:18px}.metrics-row{grid-template-columns:1fr 1fr}.metric-card{padding:var(--space-md)}.metric-value{font-size:28px}.content-grid{grid-template-columns:1fr}.roster-table-wrap{display:none}.roster-cards{display:flex!important}.roster-header{flex-direction:column;align-items:flex-start;gap:var(--space-sm)}.roster-search{width:100%}.attention-panel{flex-direction:column}.attention-section{min-width:0}.actions-grid{grid-template-columns:1fr}.chart-container{height:220px}.report-header{flex-wrap:wrap}.report-brain-score{width:64px;height:64px}.score-ring-value{font-size:18px}}