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88%);width:1.5px;position:absolute;top:8px;bottom:-26px;left:50%;transform:translate(-50%)}.chat-bubble{border-radius:16px;min-width:0;padding:15px 20px;font-size:.96rem;line-height:1.8}.chat-turn--teacher .chat-bubble{background:var(--bg-elevated);border:1px solid var(--border);color:var(--text-primary);border-top-left-radius:5px}.chat-turn--user .chat-bubble{background:var(--accent-subtle);border:1px solid color-mix(in srgb, var(--accent) 24%, transparent);color:var(--text-primary);border-bottom-right-radius:5px}.chat-typing{background:var(--bg-elevated);border:1px solid var(--border);border-radius:5px 16px 16px;align-items:center;gap:5px;padding:16px 18px;display:inline-flex}.chat-typing span{background:var(--accent);opacity:.7;border-radius:50%;width:7px;height:7px;animation:1.4s infinite typingBounce}.chat-typing span:nth-child(2){animation-delay:.18s}.chat-typing span:nth-child(3){animation-delay:.36s}.chat-compose{padding:12px clamp(12px,3vw,28px) 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var(--transition);border:none;border-radius:12px;flex-shrink:0;justify-content:center;align-items:center;display:flex}.chat-send:hover:not(:disabled){background:var(--accent-hover)}.chat-send:active:not(:disabled){transform:scale(.94)}.chat-send:disabled{opacity:.35;cursor:not-allowed}.chat-compose-field--listening{border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent)}.chat-input--live-dictation{color:var(--text-primary);caret-color:var(--accent)}.chat-voice-btn{border:1px solid var(--border);width:38px;height:38px;color:var(--text-muted);cursor:pointer;transition:background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);background:0 0;border-radius:12px;flex-shrink:0;justify-content:center;align-items:center;display:flex}.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(.94)}.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;justify-content:center;align-items:center;padding:clamp(12px,4vw,32px);display:flex;position:fixed;inset:0}.teacher-call-backdrop{background:color-mix(in srgb, var(--bg-primary) 72%, #000 28%);-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);color:#052228;width:auto;min-height:0;box-shadow:0 3px 14px color-mix(in srgb, var(--accent) 38%, transparent);border:none;border-radius:999px;flex-shrink:0;padding:9px 16px;font-size:.84rem;font-weight:600}.teacher-call-switch-chat:hover:not(:disabled){background:var(--accent-hover);color:#052228;box-shadow:0 6px 22px color-mix(in srgb, var(--accent) 50%, transparent);transform:translateY(-1px)}.teacher-call-switch-chat:active:not(:disabled){box-shadow:0 3px 14px color-mix(in srgb, var(--accent) 38%, transparent);transform:translateY(0)}.teacher-call-header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;gap:12px;padding:20px 22px 12px;display:flex}.teacher-call-eyebrow{letter-spacing:.08em;text-transform:uppercase;color:var(--text-muted);margin:0 0 4px;font-size:.72rem}.teacher-call-title{color:var(--text-primary);margin:0;font-size:1.05rem;font-weight:600}.teacher-call-end{border:1px solid var(--border);color:var(--text-secondary);cursor:pointer;transition:background var(--transition), color var(--transition), border-color var(--transition);background:0 0;border-radius:12px;align-items:center;gap:6px;padding:8px 12px;font-size:.84rem;display:inline-flex}.teacher-call-end:hover{color:var(--danger,#e5484d);border-color:color-mix(in srgb, var(--danger,#e5484d) 40%, var(--border));background:color-mix(in srgb, var(--danger,#e5484d) 8%, transparent)}.teacher-call-stage{text-align:center;flex-direction:column;flex:1;justify-content:center;align-items:center;gap:20px;padding:28px 22px 20px;display:flex;overflow-y:auto}.teacher-call-orb{background:radial-gradient(circle at 35% 35%, color-mix(in srgb, var(--accent) 55%, white), color-mix(in srgb, var(--accent) 18%, transparent));width:88px;height:88px;box-shadow:0 0 0 0 color-mix(in srgb, var(--accent) 30%, transparent);border-radius:50%}.teacher-call-orb--listening{animation:1.4s ease-in-out infinite callOrbPulse}.teacher-call-orb--thinking{opacity:.75;animation:2s ease-in-out infinite callOrbPulse}.teacher-call-orb--speaking{animation:.9s ease-in-out infinite callOrbSpeak}.teacher-call-waveform{border-radius:12px;flex-shrink:0;width:min(320px,90%);height:52px;position:relative;overflow:hidden}.teacher-call-bubble{text-align:left;border-radius:16px;width:100%;max-width:440px;max-height:40vh;padding:14px 16px;overflow-y:auto}.teacher-call-bubble--user{background:color-mix(in srgb, var(--accent) 14%, var(--bg-primary));border:1px solid color-mix(in srgb, var(--accent) 28%, var(--border))}.teacher-call-bubble--assistant{background:var(--bg-primary);border:1px solid var(--border)}.teacher-call-hint{max-width:360px;color:var(--text-muted);margin:0;font-size:.9rem;line-height:1.55}.teacher-call-typing{margin-top:-8px}.teacher-call-footer{border-top:1px solid var(--border);background:color-mix(in srgb, var(--bg-primary) 40%, var(--bg-secondary));flex-direction:column;gap:14px;padding:16px 20px 20px;display:flex}.teacher-call-status{letter-spacing:.04em;text-transform:uppercase;text-align:center;color:var(--text-muted);margin:0;font-size:.8rem;font-weight:500}.teacher-call-send{align-self:center;min-width:140px}.teacher-call-send:disabled{opacity:.45;cursor:default}.teacher-call-footer-choices{border:1px solid var(--border);background:var(--bg-primary);border-radius:16px;padding:14px}.teacher-call-chip-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;width:100%;display:grid}.teacher-call-chip{border:1px solid var(--border);background:var(--bg-secondary);min-height:44px;color:var(--text-primary);text-align:center;cursor:pointer;transition:background var(--transition), border-color var(--transition), color var(--transition), transform var(--transition);border-radius:12px;justify-content:center;align-items:center;padding:10px 12px;font-size:.84rem;font-weight:600;line-height:1.25;display:flex}.teacher-call-chip:hover:not(:disabled){border-color:color-mix(in srgb, var(--accent) 45%, var(--border));background:color-mix(in srgb, var(--accent) 10%, var(--bg-secondary));color:var(--text-primary)}.teacher-call-chip:active:not(:disabled){transform:scale(.98)}.teacher-call-chip:disabled{opacity:.45;cursor:not-allowed}.teacher-call-other-form{flex-direction:column;gap:12px;width:100%;display:flex}.teacher-call-other-form-prompt{color:var(--text-secondary);text-align:left;margin:0;font-size:.86rem;line-height:1.45}.teacher-call-other-form-input{border:1px solid var(--border);background:var(--bg-secondary);width:100%;min-height:5rem;color:var(--text-primary);font:inherit;resize:vertical;border-radius:12px;padding:12px 14px;line-height:1.45}.teacher-call-other-form-input:focus{border-color:color-mix(in srgb, var(--accent) 50%, var(--border));box-shadow:0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);outline:none}.teacher-call-controls{width:100%}.teacher-call-controls-row{grid-template-columns:repeat(auto-fit,minmax(0,1fr));gap:10px;width:100%;display:grid}.teacher-call-starting{color:var(--text-secondary);letter-spacing:.02em;justify-content:center;align-items:center;gap:10px;padding:10px 20px;font-size:.9rem;font-weight:500;display:inline-flex}.teacher-call-starting--bar{border:1px dashed var(--border);background:var(--bg-primary);border-radius:999px;width:100%;min-height:48px}.teacher-call-starting-spinner{border:2px solid var(--border);border-top-color:var(--accent);border-radius:50%;width:18px;height:18px;animation:.75s linear infinite teacher-call-spin}@keyframes teacher-call-spin{to{transform:rotate(360deg)}}.teacher-call-action{cursor:pointer;min-height:48px;transition:transform var(--transition), opacity var(--transition), background var(--transition), border-color var(--transition), box-shadow var(--transition);border:none;border-radius:999px;justify-content:center;align-items:center;gap:8px;padding:0 20px;font-size:.92rem;font-weight:600;line-height:1;display:inline-flex}.teacher-call-action:active:not(:disabled){transform:scale(.98)}.teacher-call-action--primary{background:var(--accent);color:#052228;box-shadow:0 4px 18px color-mix(in srgb, var(--accent) 32%, transparent)}.teacher-call-action--primary:hover:not(:disabled){background:var(--accent-hover);box-shadow:0 6px 22px color-mix(in srgb, var(--accent) 42%, transparent)}.teacher-call-action--secondary{background:var(--bg-primary);border:1px solid var(--border);color:var(--text-secondary)}.teacher-call-action--secondary:hover:not(:disabled){color:var(--text-primary);border-color:color-mix(in srgb, var(--accent) 35%, var(--border))}.teacher-call-action--icon{gap:6px;padding:0 16px}.teacher-call-action--full,.teacher-call-action--grow{width:100%}.teacher-call-action:disabled{opacity:.4;cursor:not-allowed;box-shadow:none}.teacher-call-voice-error{text-align:center;color:var(--danger,#e5484d);margin:0;font-size:.82rem}@keyframes callOrbPulse{0%,to{box-shadow:0 0 0 0 color-mix(in srgb, var(--accent) 35%, transparent);transform:scale(1)}50%{box-shadow:0 0 0 14px color-mix(in srgb, var(--accent) 0%, transparent);transform:scale(1.04)}}@keyframes callOrbSpeak{0%,to{transform:scale(1)}50%{transform:scale(1.08)}}@keyframes voicePulse{0%,to{box-shadow:0 0 0 0 color-mix(in srgb, var(--accent) 35%, transparent)}50%{box-shadow:0 0 0 6px color-mix(in srgb, var(--accent) 0%, transparent)}}.chat-spinner{border:2px solid var(--border);border-top-color:var(--accent);border-radius:50%;width:22px;height:22px;animation:.8s linear infinite spin}.chat-spinner--sm{border-width:2px;border-top-color:#052228;width:15px;height:15px}@keyframes chatRise{0%{opacity:0;transform:translateY(7px)}to{opacity:1;transform:translateY(0)}}.ready-bar{color:var(--text-secondary);justify-content:center;align-items:center;gap:14px;padding:12px 16px 18px;font-size:.88rem;display:flex}.navbar{border-bottom:1px solid var(--border);background:var(--bg-glass);-webkit-backdrop-filter:blur(20px);z-index:100;justify-content:space-between;align-items:center;padding:16px 24px;display:flex;position:sticky;top:0}.navbar-brand{letter-spacing:-.02em;background:var(--gradient-primary);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-size:1.3rem;font-weight:800;text-decoration:none}.navbar-actions{align-items:center;gap:12px;display:flex}.avatar{border-radius:var(--radius-full);border:1px solid var(--border-hover);width:34px;height:34px;font-family:var(--font-mono);letter-spacing:.02em;color:var(--text-secondary);background:0 0;justify-content:center;align-items:center;font-size:.72rem;font-weight:500;display:flex}.user-pill{color:var(--text-secondary);letter-spacing:.01em;font-size:.82rem}.user-spend-pill{font-family:var(--font-mono);letter-spacing:.02em;color:var(--text-secondary);border:1px solid var(--border);white-space:nowrap;background:#ffffff08;border-radius:999px;padding:5px 11px;font-size:.75rem;font-weight:500}.setup-stepper{border-bottom:1px solid var(--border);background:#070b12e6;flex-wrap:wrap;justify-content:center;align-items:center;gap:8px;padding:16px clamp(16px,3vw,32px);display:flex}.setup-step{border-radius:var(--radius-full);border:1px solid var(--border);letter-spacing:.06em;text-transform:uppercase;transition:all var(--transition);align-items:center;gap:8px;padding:8px 16px;font-size:.78rem;font-weight:600;display:flex}.setup-step--done{border-color:var(--success);background:var(--success-subtle);color:var(--success)}.setup-step--active{border-color:var(--sage);background:var(--sage-subtle);color:var(--sage)}.setup-step--pending{color:var(--text-muted);background:var(--bg-tertiary)}.setup-stepper-item{align-items:center;gap:8px;display:flex}.setup-step-num{background:var(--bg-elevated);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:22px;height:22px;font-size:.7rem;font-weight:700;display:inline-flex}.setup-step--done .setup-step-num{background:var(--success);color:#0a120e}.setup-step--active .setup-step-num{background:var(--sage);color:#030508}.setup-step-connector{background:var(--border);width:24px;height:1px}.setup-step-connector--done{background:var(--success)}.app-shell--immersive{height:100dvh;overflow:hidden}.immersive-stage-hint{text-align:center;color:var(--text-secondary);border-bottom:1px solid var(--border);background:#070b1299;margin:0;padding:10px 24px;font-size:.82rem}.immersive-body{flex-direction:column;flex:1;min-height:0;padding:0 clamp(16px,3vw,40px) 20px;display:flex}.immersive-scroll-pane{overscroll-behavior:contain;-webkit-overflow-scrolling:touch;flex:1;width:100%;min-height:0;overflow-y:auto}.app-shell--immersive .chat-shell{flex:1;width:100%;max-width:900px;height:auto;min-height:0;margin:0 auto}.app-shell--immersive .chat-container{flex:1;min-height:0}.feynman-cta{z-index:200;position:fixed;bottom:28px;left:50%;transform:translate(-50%)}.courses-grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px;padding:8px 0 48px;display:grid}.course-card-wrapper{flex-direction:column;min-height:100%;transition:all .4s cubic-bezier(.2,.8,.2,1);display:flex;position:relative;overflow:hidden}.course-card-wrapper:before{content:"";background:linear-gradient(90deg, transparent 0%, var(--sage) 50%, transparent 100%);opacity:0;height:2px;box-shadow:0 2px 12px var(--sage-glow);transition:opacity .4s,transform .4s;position:absolute;top:0;left:0;right:0;transform:scaleX(0)}.course-card-wrapper:after{content:"";border-radius:inherit;box-shadow:inset 0 0 30px var(--sage-subtle);opacity:0;pointer-events:none;transition:opacity .4s;position:absolute;inset:0}.course-card-wrapper:hover{border-color:var(--border-hover);z-index:10;transform:translateY(-4px);box-shadow:0 20px 40px -10px #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 dashed var(--border);cursor:pointer;background:0 0;flex-direction:column;justify-content:center;align-items:center;gap:14px;min-height:200px;padding:48px 24px;display:flex}.create-course-card:hover{border-color:var(--accent);background:var(--accent-subtle)}.create-course-icon{border-radius:var(--radius-full);border:1px solid var(--border);background:var(--accent-subtle);width:52px;height:52px;color:var(--accent);justify-content:center;align-items:center;font-size:1.5rem;display:flex}.resume-cta{border-radius:var(--radius-md);border:1px solid color-mix(in srgb, var(--accent) 34%, transparent);background:var(--accent-subtle);color:var(--text-primary);transition:border-color var(--transition), transform var(--transition), box-shadow var(--transition);align-items:center;gap:16px;margin-top:16px;padding:12px 18px;text-decoration:none;display:inline-flex}.resume-cta:hover{border-color:var(--accent);box-shadow:0 0 26px var(--accent-glow);color:var(--text-primary);transform:translateY(-1px)}.resume-cta-body{flex-direction:column;gap:2px;min-width:0;display:flex}.resume-cta-label{font-family:var(--font-mono);letter-spacing:.01em;text-transform:none;color:var(--accent);font-size:.74rem;font-weight:400}.resume-cta-title{text-overflow:ellipsis;white-space:nowrap;max-width:42ch;font-size:.96rem;font-weight:600;overflow:hidden}.resume-cta svg{color:var(--accent);flex-shrink:0}.studio-masthead{padding:64px 0 12px}.studio-meta{font-family:var(--font-mono);letter-spacing:.01em;color:var(--text-muted);margin-bottom:18px;font-size:.78rem}.studio-title{font-family:var(--font-display);letter-spacing:-.035em;color:var(--text-primary);margin:0;font-size:clamp(3rem,9vw,5.5rem);font-weight:600;line-height:.95}.studio-stop{color:var(--accent)}.studio-lede{max-width:46ch;color:var(--text-secondary);margin:22px 0 0;font-size:1.08rem;line-height:1.65}.billing-controls{flex-wrap:wrap;align-items:center;gap:12px 16px;margin:36px 0 28px;display:flex}.billing-toggle{border:1px solid var(--border);border-radius:var(--radius-md);background:var(--bg-secondary);gap:4px;padding:4px;display:inline-flex}.billing-toggle__btn{border-radius:calc(var(--radius-md) - 2px);color:var(--text-secondary);font-family:var(--font-sans);cursor:pointer;transition:background var(--transition), color var(--transition);background:0 0;border:none;padding:8px 18px;font-size:.875rem;font-weight:500}.billing-toggle__btn:hover:not(:disabled){color:var(--text-primary)}.billing-toggle__btn.is-active{background:var(--gradient-primary);color:#052228;font-weight:600}.billing-toggle__btn:disabled{opacity:.45;cursor:not-allowed}.billing-toggle-note{color:var(--text-muted);flex-basis:100%;margin:0;font-size:.82rem;line-height:1.5}.plan-status-banner{border:1px solid var(--border);border-radius:var(--radius-lg);background:radial-gradient(120% 140% at 0% 0%, color-mix(in srgb, var(--accent) 6%, transparent), transparent 55%), var(--bg-secondary);color:var(--text-secondary);margin:0 0 28px;padding:18px 22px;font-size:.92rem;line-height:1.6;position:relative}.plan-status-banner:before{content:"";background:var(--accent);width:48px;height:2px;position:absolute;top:0;left:0}.plan-status-banner strong{color:var(--text-primary);font-weight:600}.plan-grid{grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr));gap:20px;padding-bottom:48px;display:grid}@media (min-width:900px){.plan-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (min-width:1200px){.plan-grid{grid-template-columns:repeat(4,minmax(0,1fr))}}.plan-card{border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--bg-secondary);min-height:100%;transition:border-color var(--transition), transform var(--transition);flex-direction:column;gap:0;padding:24px 22px 22px;display:flex;position:relative}.plan-card:hover{border-color:var(--border-hover)}.plan-card.is-current{border-color:color-mix(in srgb, var(--accent) 45%, 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clamp(8px,2vw,20px);text-decoration:none;display:flex}.ledger-delete{width:40px;height:40px;color:var(--text-muted);cursor:pointer;opacity:.7;transition:opacity var(--transition), color var(--transition), background var(--transition);background:0 0;border:none;border-radius:8px;flex-shrink:0;justify-content:center;align-self:center;align-items:center;margin-right:clamp(4px,1.5vw,12px);display:flex}.ledger-row:hover .ledger-delete,.ledger-row:focus-within .ledger-delete,.ledger-delete:focus-visible{opacity:1}.ledger-delete:hover,.ledger-delete:focus-visible{color:var(--destructive,#b42318);background:color-mix(in srgb, var(--destructive,#b42318) 10%, transparent)}.ledger-invite{width:40px;height:40px;color:var(--text-muted);cursor:pointer;opacity:.7;transition:opacity var(--transition), color var(--transition), background var(--transition);background:0 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#00000059}.invite-panel-empty{color:var(--text-muted);margin:0;padding:12px}.invite-panel-list{flex-direction:column;gap:8px;margin:0;padding:0;list-style:none;display:flex}.invite-panel-item{background:var(--bg-tertiary);border-radius:10px;padding:10px}.invite-panel-item p{color:var(--text-primary);margin:0 0 10px;font-size:.92rem;line-height:1.4}.invite-panel-actions{gap:8px;display:flex}.invite-accept,.invite-decline{cursor:pointer;border-radius:8px;padding:6px 12px;font-size:.85rem}.invite-accept{background:var(--accent);color:#041016;border:none}.invite-accept:disabled,.invite-decline:disabled{opacity:.6;cursor:default}.invite-decline{border:1px solid var(--border);color:var(--text-primary);background:0 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] 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