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(pointer:fine){.chat-voice-btn:hover:not(:disabled){color:var(--text-primary);border-color:var(--accent);background:color-mix(in srgb, var(--accent) 8%, transparent)}}.chat-voice-btn:active:not(:disabled){transform:scale(.97)}.chat-voice-btn:disabled{opacity:.35;cursor:not-allowed}.chat-voice-btn--active{color:var(--accent);border-color:var(--accent);background:color-mix(in srgb, var(--accent) 12%, transparent);animation:1.6s ease-in-out infinite voicePulse}.chat-voice-btn--cancel{color:var(--text-muted)}.chat-voice-btn--cancel:hover:not(:disabled){color:var(--danger,#e5484d);border-color:color-mix(in srgb, var(--danger,#e5484d) 45%, var(--border));background:color-mix(in srgb, var(--danger,#e5484d) 8%, transparent)}.chat-voice-error{max-width:760px;color:var(--danger,#e5484d);text-align:center;margin:8px auto 0;padding:0 clamp(12px,3vw,28px);font-size:.82rem}.chat-compose-field{position:relative}.voice-waveform-canvas-wrap{pointer-events:none;align-items:center;display:flex;position:absolute;inset:0;overflow:hidden}.voice-waveform-canvas{width:100%;height:100%;color:var(--accent);display:block}.chat-call-row{justify-content:center;max-width:760px;margin:10px auto 0;padding:0 clamp(12px,3vw,28px);display:flex}.chat-call-btn{border:1px solid var(--border);background:var(--bg-secondary);color:var(--text-secondary);cursor:pointer;transition:border-color var(--transition), color var(--transition), background var(--transition);border-radius:999px;align-items:center;gap:8px;padding:8px 16px;font-size:.86rem;font-weight:500;display:inline-flex}.chat-call-btn:hover:not(:disabled){color:var(--text-primary);border-color:var(--accent);background:color-mix(in srgb, var(--accent) 8%, transparent)}.chat-call-btn--active{color:var(--accent);border-color:var(--accent);background:color-mix(in srgb, var(--accent) 12%, transparent)}.chat-call-btn:disabled{opacity:.4;cursor:not-allowed}.teacher-call{z-index:80;padding:clamp(12px,4vw,32px);padding-top:max(clamp(12px, 4vw, 32px), calc(var(--theme-toggle-inset-top) + 48px));justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.teacher-call-backdrop{background:var(--scrim);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);position:absolute;inset:0}.teacher-call-panel{z-index:1;border:1px solid var(--border);background:var(--bg-secondary);width:min(560px,100%);max-height:min(88vh,720px);box-shadow:var(--shadow-lg,0 24px 64px #00000059);border-radius:24px;flex-direction:column;display:flex;position:relative;overflow:hidden}.teacher-call-switch-chat{background:var(--accent);width:auto;min-height:0;color:var(--on-accent);box-shadow:0 3px 14px color-mix(in srgb, var(--accent) 38%, transparent);transition:background-color .15s ease, transform .16s var(--ease-out);border:none;border-radius:999px;flex-shrink:0;padding:9px 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#000000b3}.course-card-wrapper:hover:before{opacity:1;transform:scaleX(1)}.course-card-wrapper:hover:after{opacity:1}.course-card-link{color:inherit;cursor:pointer;flex-direction:column;flex:1;padding:24px;text-decoration:none;display:flex}.course-card-link:hover{color:inherit}.course-card-delete{z-index:1;color:var(--text-muted);position:absolute;top:10px;right:10px}.course-card-delete:hover{color:var(--error,#e5484d);background:var(--bg-tertiary)}.course-card{cursor:pointer;padding:24px}.course-card:hover{box-shadow:var(--shadow-glow);transform:translateY(-4px)}.course-card-title{font-family:var(--font-display);margin-bottom:8px;font-size:1.35rem;font-weight:600;line-height:1.25}.course-card-desc{color:var(--text-secondary);-webkit-line-clamp:2;-webkit-box-orient:vertical;margin-bottom:16px;font-size:.88rem;display:-webkit-box;overflow:hidden}.course-card-footer{justify-content:space-between;align-items:center;display:flex}.course-card-date{color:var(--text-muted);font-size:.78rem}.create-course-card{border:1px 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0}.ledger-index{width:34px;font-family:var(--font-mono);color:var(--text-muted);flex-shrink:0;justify-content:center;align-items:center;font-size:.92rem;display:flex}.ledger-row[data-status=active] .ledger-index{color:var(--accent)}.ledger-row[data-status=completed] .ledger-index{color:var(--success)}.ledger-main{flex-direction:column;flex:1;gap:4px;min-width:0;display:flex}.ledger-title{font-family:var(--font-display);letter-spacing:-.015em;color:var(--text-primary);text-overflow:ellipsis;white-space:nowrap;font-size:clamp(1.15rem,2.4vw,1.5rem);font-weight:600;line-height:1.15;overflow:hidden}.ledger-sub{font-family:var(--font-mono);color:var(--text-muted);text-overflow:ellipsis;white-space:nowrap;font-size:.74rem;overflow:hidden}.ledger-go{color:var(--text-muted);flex-shrink:0}@media (hover:hover) and (pointer:fine){.ledger-row:hover .ledger-go{color:var(--accent)}}.ledger-row--new{color:var(--text-secondary)}.ledger-row--new 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