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h2{color:var(--color-text-primary);letter-spacing:-.02em;word-break:keep-all;margin:0;font-size:21px;font-weight:700;line-height:1.25}.teacher-session-time{margin:0;font-size:13px}.teacher-session-actions{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.qr-label-btn{border:1px solid var(--color-text-primary);background:var(--color-text-primary);min-width:92px;height:40px;color:var(--color-surface);cursor:pointer;transition:all .15s var(--ease-smooth);border-radius:13px;justify-content:center;align-items:center;gap:6px;padding:0 14px;font-size:13px;font-weight:600;display:inline-flex}.qr-label-btn:hover{background:var(--color-text-body);border-color:var(--color-text-body)}.qr-label-btn:focus-visible{outline:2px solid var(--color-btn-primary);outline-offset:2px}.teacher-session-stats{border-top:1px solid var(--color-border);grid-template-columns:repeat(3,minmax(0,1fr));padding-top:18px;display:grid}.teacher-session-stats>div{border-left:1px solid var(--color-border);padding:0 18px}.teacher-session-stats>div:first-child{border-left:0;padding-left:2px}.teacher-session-stats .stat-num{font-family:var(--font-heading);letter-spacing:-.01em;color:var(--color-text-primary);font-size:24px;font-weight:600;line-height:1}.teacher-session-stats .stat-label{color:var(--color-text-muted);margin-top:5px;font-size:11.5px;font-weight:500}.teacher-session-activity,.teacher-session-empty-hint{min-width:0;color:var(--color-text-muted);align-items:center;gap:12px;margin:0;padding-left:2px;font-size:13px;display:flex}.teacher-session-empty-hint{font-size:12.5px}.session-avatar-row{flex-shrink:0;align-items:center;display:flex}.session-avatar{border:2px solid var(--color-surface);border-radius:999px;flex-shrink:0;justify-content:center;align-items:center;width:24px;height:24px;font-size:10.5px;font-weight:600;display:inline-flex}.session-avatar-overflow{border:2px solid var(--color-surface);background:var(--color-surface-hover);width:24px;height:24px;color:var(--color-text-muted);border-radius:999px;flex-shrink:0;justify-content:center;align-items:center;margin-left:-8px;font-size:10.5px;font-weight:500;display:inline-flex}.teacher-session-activity .activity-text{flex:1;min-width:0}.teacher-session-activity .activity-text strong{color:var(--color-text-primary);font-weight:600}.danger-modal{border-color:var(--color-danger)}.danger-modal .button:not(.secondary){border-color:var(--color-danger);background:var(--color-danger)}@media (width<=680px){.sessions-header{flex-direction:column;align-items:stretch}.sessions-header .button{width:100%}.session-card{border-radius:20px;padding:18px}.teacher-session-main{grid-template-columns:1fr;gap:14px}.teacher-session-code-tile{width:112px;min-height:56px}.teacher-session-actions{justify-content:flex-start;width:100%}.teacher-session-stats{grid-template-columns:1fr;gap:12px}.teacher-session-stats>div{border-left:0;border-top:1px solid var(--color-border);padding:12px 0 0}.teacher-session-stats>div:first-child{border-top:0;padding-top:0}}.meta-row{color:var(--color-text-muted);flex-wrap:wrap;align-items:center;gap:12px 16px;font-size:13px;display:flex}.meta-item{align-items:center;gap:5px;display:inline-flex}.code-badge{border-radius:var(--radius-input);background:var(--color-surface-hover);min-height:30px;color:var(--color-text-primary);text-transform:uppercase;font-family:var(--font-mono);letter-spacing:.08em;align-items:center;padding:3px 10px;font-size:14px;font-weight:800;display:inline-flex}.pill{white-space:nowrap;border-radius:999px;align-items:center;gap:6px;min-height:24px;padding:3px 9px;font-size:12px;font-weight:700;display:inline-flex}.pill:before{content:"";background:currentColor;border-radius:999px;flex:none;width:6px;height:6px}.pill.success{background:var(--color-success-bg);color:var(--color-success-text)}.pill.progress{background:var(--color-progress-bg);color:var(--color-progress-text)}.pill.wait{background:var(--color-surface-hover);color:var(--color-text-muted)}.pill.danger{background:var(--color-danger-bg);color:var(--color-danger-text)}.ai-badge{border:1px solid var(--color-border);border-radius:var(--radius-badge);background:var(--color-surface);width:fit-content;color:var(--color-text-body);align-items:center;gap:8px;padding:6px 10px;font-size:13px;font-weight:700;display:inline-flex}.ai-badge:before,.live-pill:before{content:"";background:var(--color-success);border-radius:999px;width:7px;height:7px}.live-pill{background:var(--color-surface-hover);min-height:28px;color:var(--color-text-body);border-radius:999px;flex:none;align-items:center;gap:7px;padding:0 10px;font-size:12px;font-weight:700;display:inline-flex}.section-kicker{color:var(--color-text-muted);letter-spacing:.08em;margin:0;font-size:12px;font-weight:700}.section-title{color:var(--color-text-primary);margin:2px 0 0;font-size:16px;font-weight:700;line-height:1.35}.stats-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-top:16px;display:grid}.stat-card{background:linear-gradient(180deg, var(--color-surface), var(--color-surface-alt));padding:18px}.stat-num{color:var(--color-text-primary);letter-spacing:-.03em;font-size:32px;font-weight:700;line-height:1}.stat-label{color:var(--color-text-muted);margin-top:8px;font-size:13px;font-weight:600}.content-grid{grid-template-columns:minmax(0,1fr) 320px;align-items:start;gap:16px;margin-top:16px;display:grid}.main-stack,.side-stack{gap:16px;display:grid}.section-head{justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:12px;display:flex}.section-head h2{color:var(--color-text-primary);letter-spacing:-.01em;margin:0;font-size:16px;font-weight:700}.section-head p{color:var(--color-text-muted);margin:3px 0 0;font-size:12.5px;line-height:1.55}.student-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;display:grid}.student-card{gap:14px;min-height:188px;padding:16px;display:grid;position:relative;overflow:hidden}.student-card.reported:before{content:"";background:var(--color-danger);width:4px;position:absolute;inset:0 auto 0 0}.student-top{justify-content:space-between;align-items:flex-start;gap:10px;display:flex}.student-name{color:var(--color-text-primary);margin:0;font-size:16px;font-weight:700;line-height:1.35}.student-meta{color:var(--color-text-muted);margin:2px 0 0;font-size:12px}.student-explore-chip{border:1px solid var(--color-border);border-radius:var(--radius-badge);background:var(--color-surface-alt);color:var(--color-text-muted);margin:5px 0 0;padding:2px 8px;font-size:11px;font-weight:700;display:inline-block}.step-name{color:var(--color-text-body);margin:0 0 8px;font-size:13px;font-weight:700}.progress-track{background:var(--color-surface-hover);border-radius:999px;height:8px;overflow:hidden}.progress-fill{border-radius:inherit;background:var(--color-btn-primary);height:100%}.progress-fill.done{background:var(--color-success)}.progress-fill.wait{background:var(--color-border-hover)}.student-foot{align-self:end;gap:8px;display:grid}.foot-row{color:var(--color-text-muted);justify-content:space-between;align-items:center;gap:10px;font-size:12px;display:flex}.reports-card{padding:18px}.report-list-cards{gap:10px;margin-top:12px;display:grid}.report-item{border:1px solid var(--color-border);border-radius:var(--radius-card);background:var(--color-surface-alt);padding:12px}.report-row{justify-content:space-between;align-items:center;gap:8px;display:flex}.report-title{color:var(--color-text-primary);font-weight:700}.report-note{color:var(--color-text-muted);margin:6px 0 0;font-size:12.5px;line-height:1.55}.empty-note{color:var(--color-text-muted);margin-top:12px;font-size:13px;line-height:1.6}.guide-card{border:1px dashed var(--color-border-hover);border-radius:var(--radius-card);background:var(--color-surface);padding:18px}.guide-card strong{color:var(--color-text-primary);margin-bottom:4px;font-size:14px;display:block}.guide-card p{color:var(--color-text-muted);margin:0;font-size:13px;line-height:1.6}@media (width<=920px){.top-grid,.content-grid{grid-template-columns:1fr}.student-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (width<=680px){.header-row,.section-head{flex-direction:column;display:flex}.actions-row{flex-wrap:wrap;width:100%}.btn{min-height:48px}.stats-grid,.student-grid{grid-template-columns:1fr}}.qr-fullscreen{z-index:70;background:#1c19179e;padding:24px;display:flex;position:fixed;inset:0;overflow:auto}@supports (color:color-mix(in lab, red, red)){.qr-fullscreen{background:color-mix(in srgb, var(--color-text-primary) 62%, transparent)}}.qr-fullscreen-panel{border:1px solid var(--color-border);border-radius:var(--radius-card);background:var(--color-surface);justify-items:center;gap:16px;width:max-content;max-width:92vw;margin:auto;padding:clamp(28px,5vw,52px);display:grid;position:relative;box-shadow:0 24px 80px #1c191738}@supports (color:color-mix(in lab, red, red)){.qr-fullscreen-panel{box-shadow:0 24px 80px color-mix(in srgb, var(--color-text-primary) 22%, transparent)}}.qr-fullscreen-panel{text-align:center}.qr-fullscreen-close{border:1px solid var(--color-border);background:var(--color-surface);width:44px;height:44px;color:var(--color-text-primary);cursor:pointer;border-radius:999px;font-size:28px;line-height:1;position:absolute;top:14px;right:14px}.qr-fullscreen-copy h2{font-size:var(--type-section-size);line-height:var(--type-section-leading);margin:4px 0 0}.qr-fullscreen-code{font-family:var(--font-mono);letter-spacing:.08em;font-size:clamp(96px,18vw,200px);font-weight:800;line-height:1}.qr-live-count{background:var(--color-success-bg);min-height:32px;color:var(--color-success-text);border-radius:999px;align-items:center;gap:8px;padding:0 12px;font-size:13px;font-weight:800;display:inline-flex}.qr-live-count span{background:currentColor;border-radius:999px;width:8px;height:8px}.qr-fullscreen-image-wrap{aspect-ratio:1;border:1px solid var(--color-border);border-radius:var(--radius-card);background:var(--color-surface);place-items:center;width:min(70vw,70vh);padding:14px;display:grid}.qr-fullscreen-image,.qr-fullscreen-placeholder{border-radius:var(--radius-input);width:100%;height:100%}.qr-fullscreen-placeholder{background:var(--color-surface-hover)}@media (width>=768px){.qr-fullscreen-image-wrap{width:min(45vw,45vh)}}.qr-fullscreen-guide{color:var(--color-text-body);word-break:keep-all;margin:0;font-size:16px;font-weight:700}@media (width>=640px){.qr-fullscreen-guide{font-size:20px}}.qr-copy-button{border-radius:999px;min-height:48px}.qr-fullscreen-url{overflow-wrap:anywhere;max-width:100%;color:var(--color-text-muted);font-family:var(--font-mono);margin:0;font-size:12px}.modal-backdrop{z-index:50;background:#0f172a73;justify-content:center;align-items:center;padding:20px;display:flex;position:fixed;inset:0}.modal-card{border:1px solid var(--color-border);border-radius:var(--radius-card);background:var(--color-surface);width:100%;max-width:420px;padding:24px;box-shadow:0 12px 40px #0f172a2e}.ended-banner{border:1px solid var(--color-border);border-radius:var(--radius-card);background:var(--color-surface-hover);color:var(--color-text-body);flex-direction:column;gap:4px;margin-top:12px;padding:12px 16px;font-size:14px;display:flex}.ended-banner strong{color:var(--color-text-primary)}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}