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var(--tcas-space-2);border-radius:var(--tcas-radius-sm);background:var(--tcas-accent-soft);color:var(--tcas-accent-strong);font-size:var(--tcas-text-sm);letter-spacing:.02em;place-items:center;font-weight:800;display:grid}.tcas-topbar__title{flex-direction:column;align-items:flex-start;line-height:1.15;display:flex}.tcas-topbar__title strong{font-size:var(--tcas-text-md);font-weight:800}.tcas-topbar__title span{font-size:var(--tcas-text-xs);color:var(--tcas-text-3)}.tcas-topbar__spacer{flex:1}.tcas-main{width:100%;max-width:var(--tcas-shell-max);padding:var(--tcas-space-5) var(--tcas-space-4) calc(var(--tcas-nav-height) + var(--tcas-space-7) + env(safe-area-inset-bottom));margin:0 auto}.tcas-nav{z-index:40;padding:var(--tcas-space-1) var(--tcas-space-1);padding-bottom:max(var(--tcas-space-1), env(safe-area-inset-bottom));background:color-mix(in srgb, var(--tcas-surface) 94%, transparent);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-top:1px solid var(--tcas-line);grid-template-columns:repeat(5,1fr);gap:2px;display:grid;position:fixed;bottom:0;left:0;right:0}.tcas-nav__item{min-height:var(--tcas-touch);padding:var(--tcas-space-1) 2px;border-radius:var(--tcas-radius-sm);color:var(--tcas-text-3);cursor:pointer;transition:color var(--tcas-dur) var(--tcas-ease);background:0 0;border:0;flex-direction:column;justify-content:center;align-items:center;gap:2px;font-size:11px;font-weight:700;display:flex;position:relative}.tcas-nav__item[aria-current=page]{color:var(--tcas-accent-strong);background:var(--tcas-accent-soft)}.tcas-nav__badge{border-radius:var(--tcas-radius-pill);background:var(--tcas-accent);min-width:18px;color:var(--tcas-accent-ink);text-align:center;padding:0 4px;font-size:10px;font-weight:800;line-height:18px;position:absolute;top:2px;right:calc(50% - 22px)}@media (width>=900px){.tcas-nav{z-index:25;justify-content:start;gap:var(--tcas-space-1);width:100%;max-width:var(--tcas-shell-max);padding:var(--tcas-space-2) var(--tcas-space-4);-webkit-backdrop-filter:none;backdrop-filter:none;border-top:0;border-bottom:1px solid var(--tcas-line);background:0 0;grid-template-columns:none;grid-auto-flow:column;margin:0 auto;position:sticky;inset:58px auto auto}.tcas-nav__item{justify-content:flex-start;gap:var(--tcas-space-2);min-width:0;padding:var(--tcas-space-2) var(--tcas-space-3);font-size:var(--tcas-text-sm);flex-direction:row}.tcas-nav__badge{margin-left:auto;position:static}.tcas-main{padding-bottom:var(--tcas-space-7)}}.tcas-h1{font-family:var(--tcas-font-display);font-size:var(--tcas-text-xl);font-weight:700;line-height:var(--tcas-leading-tight);margin:0}.tcas-h2{font-size:var(--tcas-text-lg);font-weight:700;line-height:var(--tcas-leading-tight);margin:0}.tcas-h3{font-size:var(--tcas-text-md);margin:0;font-weight:700}.tcas-eyebrow{font-size:var(--tcas-text-xs);letter-spacing:.09em;text-transform:uppercase;color:var(--tcas-text-3);margin:0;font-weight:800}.tcas-lede{max-width:var(--tcas-measure);margin:var(--tcas-space-2) 0 0;color:var(--tcas-text-2)}.tcas-muted{color:var(--tcas-text-3)}.tcas-numeric{font-variant-numeric:tabular-nums}.tcas-section{margin-top:var(--tcas-space-6)}.tcas-section__head{justify-content:space-between;align-items:baseline;gap:var(--tcas-space-3);margin-bottom:var(--tcas-space-3);display:flex}.tcas-section__count{font-size:var(--tcas-text-sm);color:var(--tcas-text-3)}.tcas-card{padding:var(--tcas-space-4);border:1px solid var(--tcas-line);border-radius:var(--tcas-radius-md);background:var(--tcas-surface)}.tcas-card--inset{background:var(--tcas-surface-2);border-color:#0000}.tcas-card--interactive{text-align:start;width:100%;font:inherit;color:inherit;cursor:pointer;transition:border-color var(--tcas-dur) var(--tcas-ease), transform var(--tcas-dur) var(--tcas-ease);display:block}.tcas-card--interactive:hover{border-color:var(--tcas-line-strong)}.tcas-card--interactive:active{transform:translateY(1px)}.tcas-card__title{align-items:baseline;gap:var(--tcas-space-2);justify-content:space-between;display:flex}.tcas-card__meta{margin-top:var(--tcas-space-1);font-size:var(--tcas-text-sm);color:var(--tcas-text-3)}.tcas-hero{padding:var(--tcas-space-5);border:1px solid var(--tcas-line);border-radius:var(--tcas-radius-lg);background:linear-gradient(135deg, var(--tcas-accent-soft), var(--tcas-bg-tint))}.tcas-grid{gap:var(--tcas-space-3);display:grid}@media (width>=640px){.tcas-grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}.tcas-grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}}@media (width>=1000px){.tcas-grid--subjects{grid-template-columns:repeat(auto-fit,minmax(248px,1fr))}}@media (width>=1180px){.tcas-grid--subjects{grid-template-columns:repeat(5,minmax(0,1fr))}}.tcas-list{gap:var(--tcas-space-2);flex-direction:column;margin:0;padding:0;list-style:none;display:flex}.tcas-chip{min-height:32px;padding:2px var(--tcas-space-3);border:1px solid var(--tcas-line);border-radius:var(--tcas-radius-pill);background:var(--tcas-surface);color:var(--tcas-text-2);font-size:var(--tcas-text-sm);white-space:nowrap;align-items:center;gap:6px;font-weight:600;display:inline-flex}button.tcas-chip{cursor:pointer}button.tcas-chip[aria-pressed=true]{border-color:var(--tcas-accent);background:var(--tcas-accent-soft);color:var(--tcas-accent-strong)}.tcas-chip__glyph{letter-spacing:.06em;opacity:.85;font-size:10px;font-weight:800}.tcas-filterbar{gap:var(--tcas-space-2);padding-bottom:var(--tcas-space-2);scrollbar-width:thin;-webkit-overflow-scrolling:touch;display:flex;overflow-x:auto}.tcas-tag{border-radius:var(--tcas-radius-pill);background:var(--tcas-surface-2);color:var(--tcas-text-2);font-size:var(--tcas-text-xs);flex:none;align-items:center;gap:4px;padding:2px 8px;font-weight:700;display:inline-flex}.tcas-tag--outline{border:1px dashed var(--tcas-line-strong);background:0 0}.tcas-btn{justify-content:center;align-items:center;gap:var(--tcas-space-2);min-height:var(--tcas-touch);padding:0 var(--tcas-space-4);border-radius:var(--tcas-radius-pill);background:var(--tcas-surface-2);color:var(--tcas-text);font:inherit;cursor:pointer;transition:filter var(--tcas-dur) var(--tcas-ease);border:1px solid #0000;font-weight:700;text-decoration:none;display:inline-flex}.tcas-btn:hover{filter:brightness(.97)}.tcas-btn:disabled{opacity:.55;cursor:not-allowed}.tcas-btn--primary{background:var(--tcas-accent);color:var(--tcas-accent-ink)}.tcas-btn--outline{border-color:var(--tcas-line-strong);color:var(--tcas-text);background:0 0}.tcas-btn--block{width:100%}.tcas-btn-row{gap:var(--tcas-space-2);flex-wrap:wrap;display:flex}.tcas-link{color:var(--tcas-accent-strong);text-underline-offset:3px;font-weight:700}.tcas-state{padding:var(--tcas-space-5);border:1px dashed var(--tcas-line-strong);border-radius:var(--tcas-radius-md);background:var(--tcas-surface-2);text-align:start}.tcas-state__title{margin:0 0 var(--tcas-space-2);font-size:var(--tcas-text-md);font-weight:700}.tcas-state__body{margin:0 0 var(--tcas-space-3);max-width:var(--tcas-measure);color:var(--tcas-text-2)}.tcas-state--warn{border-style:solid;border-color:color-mix(in srgb, var(--tcas-warn) 45%, transparent);background:var(--tcas-warn-soft)}.tcas-state--danger{border-style:solid;border-color:color-mix(in srgb, var(--tcas-danger) 45%, transparent);background:var(--tcas-danger-soft)}.tcas-state--info{border-style:solid;border-color:color-mix(in srgb, var(--tcas-info) 40%, transparent);background:var(--tcas-info-soft)}.tcas-skeleton{border-radius:var(--tcas-radius-md);background:linear-gradient(90deg, var(--tcas-surface-2) 25%, var(--tcas-bg-tint) 37%, var(--tcas-surface-2) 63%);background-size:400% 100%;height:76px;animation:1.4s ease-in-out infinite tcas-shimmer}@keyframes tcas-shimmer{0%{background-position:100% 0}to{background-position:0 0}}.tcas-notice{gap:var(--tcas-space-2);padding:var(--tcas-space-3);border-radius:var(--tcas-radius-sm);font-size:var(--tcas-text-sm);align-items:flex-start;display:flex}.tcas-notice--info{background:var(--tcas-info-soft);color:var(--tcas-text)}.tcas-notice--warn{background:var(--tcas-warn-soft);color:var(--tcas-text)}.tcas-notice--danger{background:var(--tcas-danger-soft);color:var(--tcas-text)}.tcas-field{gap:var(--tcas-space-2);flex-direction:column;display:flex}.tcas-field>span{font-size:var(--tcas-text-sm);color:var(--tcas-text-2);font-weight:700}.tcas-input{min-height:var(--tcas-touch);padding:0 var(--tcas-space-3);border:1px solid var(--tcas-line-strong);border-radius:var(--tcas-radius-sm);background:var(--tcas-surface);color:var(--tcas-text);font:inherit}.tcas-fieldset{border:0;margin:0;padding:0}.tcas-fieldset>legend{font-size:var(--tcas-text-sm);color:var(--tcas-text-2);padding:0;font-weight:700}.tcas-choice-grid{gap:var(--tcas-space-2);margin-top:var(--tcas-space-2);display:grid}@media (width>=560px){.tcas-choice-grid--auto{grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}}.tcas-choice{align-items:center;gap:var(--tcas-space-2);min-height:var(--tcas-touch);padding:var(--tcas-space-2) var(--tcas-space-3);border:1px solid var(--tcas-line);border-radius:var(--tcas-radius-sm);background:var(--tcas-surface);font-size:var(--tcas-text-sm);cursor:pointer;font-weight:600;display:flex}.tcas-choice input{accent-color:var(--tcas-accent);flex:none;width:18px;height:18px}.tcas-subject-bio{--tcas-subject:var(--tcas-bio);--tcas-subject-soft:var(--tcas-bio-soft)}.tcas-subject-chem{--tcas-subject:var(--tcas-chem);--tcas-subject-soft:var(--tcas-chem-soft)}.tcas-subject-phy{--tcas-subject:var(--tcas-phy);--tcas-subject-soft:var(--tcas-phy-soft)}.tcas-subject-math{--tcas-subject:var(--tcas-math);--tcas-subject-soft:var(--tcas-math-soft)}.tcas-subject-eng{--tcas-subject:var(--tcas-eng);--tcas-subject-soft:var(--tcas-eng-soft)}.tcas-subject-rail{border-inline-start:4px solid var(--tcas-subject,var(--tcas-line-strong))}.tcas-subject-mark{border-radius:var(--tcas-radius-sm);background:var(--tcas-subject-soft,var(--tcas-surface-2));width:44px;height:44px;color:var(--tcas-subject,var(--tcas-text-2));letter-spacing:.04em;flex:none;place-items:center;font-size:10px;font-weight:800;display:grid}.tcas-subject-tile{align-items:flex-start;gap:var(--tcas-space-3);width:100%;min-height:84px;padding:var(--tcas-space-4);border:1px solid var(--tcas-line);border-inline-start-width:4px;border-inline-start-color:var(--tcas-subject,var(--tcas-line));border-radius:var(--tcas-radius-md);background:var(--tcas-surface);color:inherit;font:inherit;text-align:start;cursor:pointer;transition:transform var(--tcas-dur) var(--tcas-ease);display:flex}.tcas-subject-tile:hover{transform:translateY(-1px)}.tcas-subject-tile__body{gap:var(--tcas-space-1);flex-direction:column;flex:1;min-width:0;display:flex}.tcas-subject-tile__title{font-size:var(--tcas-text-md);font-weight:700;display:block}.tcas-subject-tile__detail{font-size:var(--tcas-text-sm);color:var(--tcas-text-2);display:block}.tcas-subject-tile__trailing{margin-top:var(--tcas-space-1);flex:none}.tcas-stat{padding:var(--tcas-space-3);border:1px solid var(--tcas-line);border-radius:var(--tcas-radius-sm);background:var(--tcas-surface)}.tcas-stat__value{font-size:var(--tcas-text-lg);font-variant-numeric:tabular-nums;font-weight:800;line-height:1.2}.tcas-stat__label{font-size:var(--tcas-text-xs);color:var(--tcas-text-3)}.tcas-meter{height:8px;margin-top:var(--tcas-space-2);border-radius:var(--tcas-radius-pill);background:var(--tcas-surface-sunken);overflow:hidden}.tcas-meter>i{border-radius:inherit;background:var(--tcas-subject,var(--tcas-accent));height:100%;display:block}.tcas-topics{gap:var(--tcas-space-2);flex-wrap:wrap;margin:0;padding:0;list-style:none;display:flex}.tcas-mascot{align-items:center;gap:var(--tcas-space-3);padding:var(--tcas-space-3);border:1px solid var(--tcas-line);border-radius:var(--tcas-radius-md);background:var(--tcas-surface);display:flex}.tcas-mascot__body{min-width:0}.tcas-mascot__body p{color:var(--tcas-text-2);font-size:var(--tcas-text-sm);margin:0}.tcas-root :focus-visible{outline:3px solid var(--tcas-focus);outline-offset:2px;border-radius:var(--tcas-radius-sm)}@media (prefers-reduced-motion:reduce){.tcas-root *,.tcas-root :before,.tcas-root :after{scroll-behavior:auto!important;transition-duration:.001ms!important;animation-duration:.001ms!important;animation-iteration-count:1!important}}.tcas-account-menu{font-size:12px;position:relative}.tcas-account-menu summary{cursor:pointer;padding:10px}.tcas-account-menu>div{z-index:80;background:var(--tcas-surface);border:1px solid var(--tcas-line);border-radius:12px;min-width:180px;padding:8px;position:absolute;top:100%;right:0}.tcas-account-menu button{text-align:left;width:100%;color:var(--tcas-text);cursor:pointer;background:0 0;border:0;padding:12px;display:block}.tcas-learning-hub{max-width:1120px;margin:auto}.tcas-learning-heading{padding:12px 0 24px}.tcas-learning-heading h1{margin:8px 0;font-size:clamp(28px,4vw,48px);line-height:1.35}.tcas-learning-heading p{color:var(--tcas-text-2);line-height:1.8}.tcas-learning-modes{border-bottom:1px solid var(--tcas-line);gap:8px;padding-bottom:16px;display:flex}.tcas-learning-modes button,.tcas-learning-filters button{border:1px solid var(--tcas-line);background:var(--tcas-surface);color:var(--tcas-text);cursor:pointer;border-radius:8px;min-height:44px;padding:10px 15px}.tcas-learning-modes [aria-current],.tcas-learning-filters [aria-pressed=true]{background:var(--tcas-accent-soft);border-color:var(--tcas-accent);color:var(--tcas-accent-strong)}.tcas-learning-tools{flex-wrap:wrap;justify-content:space-between;gap:16px;padding:20px 0;display:flex}.tcas-learning-filters{flex-wrap:wrap;gap:6px;display:flex}.tcas-learning-search{border:1px solid var(--tcas-line);border-radius:8px;align-items:center;gap:8px;padding:8px 12px;display:flex}.tcas-learning-search input{color:var(--tcas-text);font:inherit;background:0 0;border:0;width:100%;min-width:0}.tcas-learning-card{border:1px solid var(--tcas-line);background:var(--tcas-surface);border-left:4px solid #ffbe45;border-radius:16px;grid-template-columns:230px 1fr;display:grid;overflow:hidden}.tcas-learning-card__art{background:#292518;min-height:270px;position:relative;overflow:hidden}.tcas-learning-card__art img{object-fit:contain;width:100%;height:100%;position:absolute;bottom:-26px}.tcas-learning-card__art span{color:#ffbe45;font-size:13px;font-weight:800;position:absolute;top:18px;left:18px}.tcas-learning-card__body{padding:28px}.tcas-learning-card h2{margin:8px 0;font-size:clamp(24px,3vw,34px)}.tcas-learning-card p{color:var(--tcas-text-2);line-height:1.8}.tcas-learning-card__facts{flex-wrap:wrap;gap:8px;margin:16px 0;display:flex}.tcas-learning-card__facts span{border:1px solid var(--tcas-line);border-radius:5px;padding:5px 8px;font-size:12px}.tcas-learning-start{font-weight:800;color:#251a00!important;background:#ffbe45!important}.tcas-learning-footnote{color:var(--tcas-text-3);margin-top:24px;font-size:13px;line-height:1.8}.tcas-learning-empty{border:1px dashed var(--tcas-line);border-radius:12px;padding:32px}.tcas-learning-empty p{line-height:1.8}.tcas-learning-quick{flex-wrap:wrap;gap:12px;margin:20px 0;display:flex}.tcas-learning-quick a{color:var(--tcas-text);border:1px solid var(--tcas-line);border-radius:8px;padding:12px 16px;text-decoration:none}@media (width<=600px){.tcas-learning-card{grid-template-columns:1fr}.tcas-learning-card__art{min-height:140px}.tcas-learning-card__art img{width:150px;bottom:-22px;right:16px}.tcas-learning-card__body{padding:20px}.tcas-learning-search{width:100%}.tcas-learning-filters button{padding:8px 12px}.tcas-topbar__title>span{display:none}.tcas-account-menu summary{padding:6px;font-size:11px}.tcas-nav__item{font-size:10px}}.tcas-root .tcas-h1{letter-spacing:-.035em;font-weight:800;line-height:1.35}.tcas-root .tcas-h2{letter-spacing:-.025em}.tcas-topbar{background:var(--tcas-bg);-webkit-backdrop-filter:none;backdrop-filter:none;min-height:72px;padding-inline:24px}.tcas-topbar__mark{background:var(--tcas-accent);width:42px;height:42px;color:var(--tcas-accent-ink);border-radius:14px;place-items:center;display:grid}.tcas-topbar__title span{margin-top:4px;font-size:10px}.tcas-nav__caption{display:none}.tcas-character{object-fit:contain;object-position:center top;pointer-events:none;-webkit-user-select:none;user-select:none;display:block}.tcas-poster-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;display:grid}.tcas-poster{isolation:isolate;border:1px solid color-mix(in srgb,var(--tcas-subject) 18%,var(--tcas-line));background:var(--tcas-subject-soft);min-width:0;height:290px;color:var(--tcas-text);text-align:left;font:inherit;cursor:pointer;transition:transform .18s var(--tcas-ease),border-color .18s 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