@layer portal.tokens,portal.base,portal.profile;@layer portal.tokens{:root{--bg: #12161a;--panel: #1a2127;--panel2: #222b32;--line: #2e3a43;--text: #e8eef2;--dim: #9aa8b2;--accent: #6aa4ff;--accent2: #a8c8ff;--warn: #e8a94a;--bad: #f2685f;--good: #4fc98a;--radius: 14px;--space: 1;--wrap: 1160px;--font: 1rem;--leading: 1.6;--card: var(--panel2);--ink: var(--text);--soft: var(--dim);--navy: var(--accent2);--teal: var(--accent)}}html{font-size:16px;color-scheme:dark}html[data-font=sm]{font-size:15px}html[data-font=md]{font-size:16px}html[data-font=lg]{font-size:18px}html[data-theme=light]{color-scheme:light;--bg: #f3f6f7;--panel: #ffffff;--panel2: #e9eff1;--line: #c7d2d7;--text: #19262d;--dim: #586a74;--card: var(--panel2);--ink: var(--text);--soft: var(--dim)}@layer portal.base{*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:var(--font)/var(--leading) -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased}a{color:var(--accent2)}.wrap{max-width:var(--wrap);margin:0 auto;padding:0 clamp(24px,4vw,52px) 96px}header.hero{background:linear-gradient(160deg,var(--panel) 0%,var(--bg) 100%);border-bottom:1px solid var(--line);padding:15px 0 12px;margin-bottom:20px}header.hero .wrap{padding-bottom:0}h1{margin:0 0 .25rem;font-size:1.6875rem;letter-spacing:-.025rem}.sub{color:var(--dim);font-size:.90625rem;margin:0}h2{font-size:1.25rem;margin:2.625rem 0 1rem;letter-spacing:-.0125rem}h3{font-size:1.03125rem;margin:1.75rem 0 .625rem}.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:1.5rem 1.75rem;margin:1.375rem 0}.tip,.trap{background:color-mix(in srgb,var(--warn) 9%,transparent);border:1px solid color-mix(in srgb,var(--warn) 35%,transparent);border-left:4px solid var(--warn);border-radius:10px;padding:1rem 1.25rem;margin:1.25rem 0}.trap{background:color-mix(in srgb,var(--bad) 9%,transparent);border-color:color-mix(in srgb,var(--bad) 35%,transparent);border-left-color:var(--bad)}.tip b.label,.trap b.label{color:var(--warn);display:block;font-size:.78125rem;text-transform:uppercase;letter-spacing:.8px;margin-bottom:.3125rem}.trap b.label{color:var(--bad)}.big{background:color-mix(in srgb,var(--accent) 9%,transparent);border:1px solid color-mix(in srgb,var(--accent) 35%,transparent);border-left:4px solid var(--accent);border-radius:10px;padding:1.125rem 1.375rem;margin:1.375rem 0}.big b.label{color:var(--accent2);display:block;font-size:.78125rem;text-transform:uppercase;letter-spacing:.8px;margin-bottom:.3125rem}table{width:100%;border-collapse:collapse;margin:1.25rem 0;font-size:.90625rem}th{text-align:left;background:var(--panel2);padding:.6875rem .875rem;color:var(--accent2);font-size:.8125rem;text-transform:uppercase;letter-spacing:.6px}td{padding:.6875rem .875rem;border-top:1px solid var(--line);vertical-align:top}td:first-child{font-weight:600}figure{margin:20px 0;text-align:center}figure img{width:100%;max-width:620px;height:auto;border-radius:10px;image-rendering:-webkit-optimize-contrast}figcaption{color:var(--dim);font-size:.84375rem;margin-top:9px;font-style:italic;max-width:620px;margin-left:auto;margin-right:auto}.imgrow{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px}.imgrow figure{margin:0}.imgrow figure img{max-width:100%}img.band{width:100%;height:76px;object-fit:cover;border-radius:12px;display:block;margin:38px 0 0;border:1px solid var(--line)}h2.band-title{margin-top:14px}button{font:inherit;cursor:pointer;border-radius:9px;border:1px solid var(--line);background:var(--panel2);color:var(--text);padding:.6875rem 1.0625rem;transition:.12s}button:hover{border-color:var(--accent)}.btn-primary{background:var(--accent);color:#0a1420;border-color:var(--accent);font-weight:600}.nav{display:flex;gap:.75rem;flex-wrap:wrap;margin:1.5rem 0 .875rem}.nav a{text-decoration:none;background:var(--panel);border:1px solid var(--line);padding:.625rem 1.0625rem;border-radius:999px;font-size:.875rem;color:var(--text)}.nav a:hover,.nav a[aria-current=page]{border-color:var(--accent);color:var(--accent2)}.pill{display:inline-block;background:var(--panel2);border:1px solid var(--line);border-radius:999px;padding:.3125rem .75rem;font-size:.78125rem;color:var(--dim)}.muted{color:var(--dim)}ul.clean{list-style:none;padding-left:0}ul.clean li{padding:.4375rem 0;border-bottom:1px solid var(--line)}.term{color:var(--accent2);font-weight:600}.pair{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:1.5rem 1.75rem;margin:1.375rem 0;position:relative}.pair.flagged{border-color:color-mix(in srgb,var(--warn) 50%,transparent)}.pair .badge{position:absolute;top:-9px;right:16px;background:var(--warn);color:#1d1405;font-size:.6875rem;font-weight:700;text-transform:uppercase;letter-spacing:.7px;padding:.1875rem .5625rem;border-radius:999px}.pair .cols{display:grid;grid-template-columns:1fr auto 1fr;gap:14px;align-items:start}.pair .col p{margin:.3125rem 0 0;font-size:.90625rem}.pair .col .term{font-size:1rem}.pair .vs{color:var(--dim);font-size:.78125rem;text-transform:uppercase;letter-spacing:1px;padding-top:4px}.pair .tell{margin-top:14px;border-top:1px solid var(--line);padding-top:12px;font-size:.90625rem}.pair .tell b.label{color:var(--accent2);display:block;font-size:.75rem;text-transform:uppercase;letter-spacing:.8px;margin-bottom:4px}@media(max-width:620px){.wrap{padding-left:18px;padding-right:18px}.card,.pair{padding:1.25rem}.pair .cols{grid-template-columns:1fr}.pair .vs{padding:0}}[data-quiz-opts],[data-drill-opts],[data-terms-opts]{gap:14px!important}footer{color:var(--dim);font-size:.8125rem;border-top:1px solid var(--line);margin-top:3.375rem;padding-top:1.125rem}.portal-menu-trigger{position:fixed;right:24px;bottom:24px;z-index:42;display:inline-flex;align-items:center;gap:9px;min-height:46px;padding:10px 16px;border-color:color-mix(in srgb,var(--accent) 55%,var(--line));background:var(--panel2);box-shadow:0 10px 30px #00000052;font-weight:650}.portal-menu-trigger:hover,.portal-menu-trigger[aria-expanded=true]{border-color:var(--accent);color:var(--accent2)}.portal-menu-icon{font-size:18px;line-height:1}.portal-menu-backdrop{position:fixed;inset:0;z-index:40;background:#0000006b}.portal-global-nav{position:fixed;right:24px;bottom:82px;z-index:41;width:min(360px,calc(100vw - 32px));max-height:calc(100vh - 112px);overflow:auto;padding:18px;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 18px 48px #0000006b}.portal-menu-backdrop[hidden],.portal-global-nav[hidden]{display:none}.portal-global-nav-head{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:12px}.portal-global-nav-head strong{font-size:18px}.portal-global-nav-close{display:grid;place-items:center;min-width:38px;min-height:38px;padding:5px;font-size:23px;line-height:1}.portal-global-nav nav{display:grid;gap:6px}.portal-global-nav a{display:block;padding:10px 12px;color:var(--text);text-decoration:none;border:1px solid transparent;border-radius:9px}.portal-global-nav a:hover{background:var(--panel2);border-color:var(--line)}.portal-global-nav a[aria-current=page]{background:color-mix(in srgb,var(--accent) 12%,transparent);border-color:color-mix(in srgb,var(--accent) 50%,var(--line));color:var(--accent2)}.portal-nav-student{margin-top:8px;font-weight:700}.portal-nav-course{margin-left:14px;color:var(--dim)!important}.portal-nav-course[aria-current=page]{color:var(--accent2)!important}@media(max-width:620px){.portal-menu-trigger{right:16px;bottom:16px}.portal-global-nav{right:16px;bottom:72px;max-height:calc(100vh - 96px)}}}@layer portal.profile{html[data-profile=airy] .wrap{max-width:var(--wrap);padding:0 clamp(28px,5vw,60px) 110px}html[data-profile=airy] header.hero{padding:11px 0 8px;margin-bottom:14px}html[data-profile=airy] header.hero .wrap{padding-bottom:0}html[data-profile=airy] h1{font-size:1.375rem;font-weight:600}html[data-profile=airy] h2{margin:2.375rem 0 1.125rem}html[data-profile=airy] p{font-size:1.125rem;line-height:1.75;max-width:none}html[data-profile=airy] .card{padding:1.75rem 2rem;margin:1.625rem 0}@media(max-width:620px){html[data-profile=airy] .wrap{padding-left:18px;padding-right:18px}html[data-profile=airy] .card{padding:1.25rem}}}.lt-host{position:relative;padding-right:5.2rem}.lt-cluster{position:absolute;top:.7rem;right:.7rem;z-index:3;display:flex;gap:.25rem;align-items:center}.lt-btn{width:2.1rem;height:2.1rem;border-radius:999px;border:1px solid var(--line, #e4ddd2);background:var(--card, #fffdf8);color:var(--navy, #1a365d);cursor:pointer;display:inline-flex;align-items:center;justify-content:center;padding:0;box-shadow:0 1px 2px #1a274414}.lt-btn:hover{border-color:var(--teal, #2c7a7b)}.lt-btn[disabled]{opacity:.45;cursor:default}.lt-btn.is-on{background:var(--teal, #2c7a7b);border-color:var(--teal, #2c7a7b);color:#fff}.lt-btn svg{width:1.05rem;height:1.05rem;display:block}.lt-btn.is-wait .lt-icon{display:none}.lt-spin{display:none;width:.9rem;height:.9rem;border:2px solid rgba(26,54,93,.2);border-top-color:var(--teal, #2c7a7b);border-radius:50%}.lt-btn.is-wait .lt-spin{display:block}.lt-btn.is-on.is-wait .lt-spin{border-color:#ffffff59;border-top-color:#fff}.portal-dock{position:sticky;top:.7rem;z-index:12;width:max-content;display:flex;align-items:center;gap:.25rem;margin:0 0 .55rem auto;padding:.35rem;background:color-mix(in srgb,var(--card, #fffdf8) 88%,transparent);border:1px solid var(--line, #e4ddd2);border-radius:999px;box-shadow:0 7px 24px #1018282e;opacity:.9;backdrop-filter:blur(10px)}.portal-dock:hover,.portal-dock:focus-within{opacity:1}.lt-all{display:contents}.lt-all[hidden]{display:none}.portal-dock .lt-btn{width:2.15rem;height:2.15rem}.lt-all-btn{background:var(--teal, #2c7a7b);border-color:var(--teal, #2c7a7b);color:#fff}.lt-all-btn.is-on{background:var(--navy, #1a365d);border-color:var(--navy, #1a365d)}.lt-all-btn.is-wait .lt-icon{display:none}.lt-all-btn.is-wait .lt-spin{display:block;border-color:#ffffff59;border-top-color:#fff}.portal-theme-icon{font-size:1rem;line-height:1}.portal-font-icon{font-size:1.08rem;font-weight:800;line-height:1}.portal-font-label{align-self:flex-end;margin:0 0 .22rem -.08rem;font-size:.52rem;font-weight:800;line-height:1}.lt-err{display:none;margin:.4rem 2.6rem 0 0;color:var(--bad, #b3372c);font-size:.85rem}.lt-host.is-err .lt-err{display:block}.lt-panel{display:none;position:fixed;z-index:40;width:min(22rem,calc(100vw - 1.5rem));background:var(--card, #fffdf8);color:var(--ink, #1a2744);border:1px solid var(--line, #e4ddd2);border-radius:14px;padding:.9rem 1rem 1rem;box-shadow:0 8px 28px #1a27442e}.lt-panel.is-open{display:block}.lt-panel h3{margin:0 0 .7rem;font-size:.95rem}.lt-panel label{display:block;font-size:.78rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--soft, #5b6780);margin:.65rem 0 .3rem}.lt-panel select{width:100%;font-size:1rem;padding:.45rem .5rem;border-radius:8px;border:1px solid var(--line, #e4ddd2);background:#fff}.lt-pills{display:flex;flex-wrap:wrap;gap:.35rem}.lt-pill{border:1px solid var(--line, #e4ddd2);background:#fff;border-radius:999px;padding:.3rem .7rem;font-weight:700;font-size:.85rem;cursor:pointer;color:var(--ink, #1a2744)}.lt-pill.is-on{background:var(--navy, #1a365d);border-color:var(--navy, #1a365d);color:#fff}.lt-panel-close{margin-top:.85rem;border:0;background:transparent;color:var(--soft, #5b6780);font-weight:700;cursor:pointer;padding:0}@media(prefers-reduced-motion:reduce){.lt-spin{border-top-color:var(--teal, #2c7a7b)}}@layer portal.base{section.step[data-step]{display:none}section.step[data-step].on{display:block}.chapters{display:block;padding:calc(.65rem * var(--space)) 0;margin-bottom:18px;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:2;background:var(--bg)}.chapter-menu{width:100%}.chapter-summary{display:none;width:100%;min-height:42px;align-items:center;gap:12px;padding:calc(.45rem * var(--space)) calc(.75rem * var(--space));border:1px solid var(--line);border-radius:12px;background:var(--panel2);color:var(--text);cursor:pointer;font-weight:700;list-style:none}.chapter-summary::-webkit-details-marker{display:none}.chapter-summary:after{content:"▾";color:var(--accent2);flex:0 0 auto;transition:transform .15s ease}.chapter-menu[open]>.chapter-summary:after{transform:rotate(180deg)}.chapter-summary:hover{border-color:var(--accent)}.chapter-summary-label{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chapter-summary-count{margin-left:auto;color:var(--dim);font-size:.82rem;font-variant-numeric:tabular-nums;white-space:nowrap}.chapter-options{display:flex!important;gap:calc(.4rem * var(--space));flex-wrap:nowrap;overflow-x:auto;padding:2px 0 7px;scrollbar-width:thin}.chip{border:1px solid var(--line);background:var(--panel2);border-radius:999px;padding:calc(.35rem * var(--space)) calc(.7rem * var(--space));font-weight:700;font-size:.82rem;cursor:pointer;color:var(--dim);font-family:inherit}.chapter-options .chip{flex:0 0 auto;white-space:nowrap}.chip:hover{border-color:var(--accent);color:var(--text)}.chip.on{background:var(--accent);color:#0a1420;border-color:var(--accent)}.chapters--menu-always .chapter-summary{display:flex}.chapters--menu-always .chapter-menu:not([open])>.chapter-options{display:none!important}.chapters--menu-always .chapter-menu[open]>.chapter-options{display:grid!important;gap:7px;max-height:min(60vh,420px);overflow:auto;overscroll-behavior:contain;margin-top:8px;padding:8px;border:1px solid var(--line);border-radius:12px;background:var(--panel)}.chapters--menu-always .chapter-menu[open] .chip{width:100%;border-radius:9px;text-align:left;white-space:normal}@media(max-width:700px){.chapters--menu-ready .chapter-summary{display:flex}.chapters--menu-ready .chapter-menu:not([open])>.chapter-options{display:none!important}.chapters--menu-ready .chapter-menu[open]>.chapter-options{display:grid!important;gap:7px;max-height:min(60vh,420px);overflow:auto;overscroll-behavior:contain;margin-top:8px;padding:8px;border:1px solid var(--line);border-radius:12px;background:var(--panel)}.chapters--menu-ready .chapter-menu[open] .chip{width:100%;border-radius:9px;text-align:left;white-space:normal}}.pager{display:flex;justify-content:space-between;margin-top:calc(1.2rem * var(--space))}.pager .btn{border:1px solid var(--line);background:var(--panel2);color:var(--text);font-weight:700;font-family:inherit;padding:calc(.65rem * var(--space)) calc(1rem * var(--space));border-radius:999px;cursor:pointer}.pager .btn:hover{border-color:var(--accent)}.pager .btn.primary{background:var(--accent);border-color:var(--accent);color:#0a1420}.pager .btn:disabled{opacity:.45;cursor:default}}@layer portal.base{.confidence{margin:calc(1rem * var(--space)) 0 calc(1.25rem * var(--space))}.confidence .ask{display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:space-between;background:var(--panel2);border:1px dashed var(--line);border-radius:12px;padding:12px 15px}.confidence .q{font-size:14.5px;color:var(--dim)}.confidence .more{font-size:13.5px;padding:7px 13px}.confidence[data-open] .ask{border-style:solid;border-color:var(--accent);border-bottom-left-radius:0;border-bottom-right-radius:0}.helpbody{border:1px solid var(--accent);border-top:none;border-radius:0 0 12px 12px;padding:18px 18px 14px;background:var(--panel);background:color-mix(in srgb,var(--accent) 6%,transparent)}.helpbody .opener{margin:0 0 16px}.help-step{display:flex;gap:13px;margin:0 0 15px}.help-step .num{flex:0 0 26px;height:26px;border-radius:50%;background:var(--accent);color:var(--bg);font-weight:700;display:flex;align-items:center;justify-content:center;font-size:13.5px}.help-step .stepbody{flex:1}.help-step .stepbody h4{margin:2px 0 5px;font-size:15px}.help-step .stepbody p{margin:0;font-size:15px}.helpbody .vids{margin-top:20px}.helpbody .vids h4,.helpbody .checkq h4{font-size:15px;margin:0 0 10px}.helpbody .vid{margin-bottom:16px}.helpbody .frame{position:relative;padding-bottom:56.25%;height:0;border-radius:10px;overflow:hidden}.helpbody .frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0}.helpbody .vnote{font-size:13.5px;color:var(--dim);margin:7px 0 0}.helpbody .checkq{margin-top:18px;border-top:1px solid var(--line);padding-top:14px}.helpbody .cq{margin:0 0 10px}.helpbody .ca{margin:11px 0 0;padding:11px 13px;background:var(--panel);border-left:3px solid var(--accent);border-radius:6px;font-size:14.5px}.helpbody .helpfig{margin:4px 0 18px}.helpbody .helpfig img{width:100%;max-width:100%;border-radius:10px;background:#fff;padding:8px}.helpbody .closing{margin:16px 0 0;font-size:13.5px;color:var(--dim);font-style:italic}}@layer portal.base{figure img{cursor:zoom-in}figure img:hover{outline:2px solid var(--accent);outline-offset:2px}#lightbox{position:fixed;inset:0;z-index:999;background:#040806f5;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:46px 18px 18px}#lightbox[hidden]{display:none}#lb-stage{flex:1;width:100%;display:flex;align-items:center;justify-content:center;overflow:auto;border-radius:10px}#lb-img{background:#fff;border-radius:10px;padding:12px;transform-origin:center center;transition:transform .12s ease-out;max-width:100%;max-height:100%}#lb-img.zoomed{max-width:none;max-height:none;cursor:grab}#lb-cap{color:var(--dim);font-size:14.5px;text-align:center;margin:12px 0 6px;max-width:760px;font-style:italic}#lb-close{position:absolute;top:12px;right:14px;font-size:20px;line-height:1;padding:7px 13px;background:var(--panel2);color:var(--text);border:1px solid var(--line);border-radius:9px;cursor:pointer}#lb-tools{display:flex;gap:8px;align-items:center}#lb-tools button{background:var(--panel2);color:var(--text);border:1px solid var(--line);border-radius:8px;padding:6px 13px;font-size:15px;cursor:pointer}#lb-pct{color:var(--dim);font-size:13px;min-width:48px;text-align:center}}.wait-bar{max-width:34em;margin:8px 0 0}.wait-bar-track{height:8px;border-radius:999px;background:#ffffff14;overflow:hidden}.wait-bar-fill{height:100%;width:0%;border-radius:999px;background:var(--accent, #3fb6c4);transition:width .5s ease-out}.wait-bar--static .wait-bar-fill{transition:none}.wait-bar-caption{margin:10px 0 0;font-size:14.5px;color:var(--dim, #9db4bc);line-height:1.5;max-width:34em;min-height:4.5em}@media(prefers-reduced-motion:reduce){.wait-bar-fill{transition:none}}.gt-thread{max-width:34em;display:flex;flex-direction:column;gap:14px;margin:0 0 18px}.gt-turn{padding:14px 16px;border-radius:14px;animation:gt-rise .4s ease}.gt-student{background:var(--panel, #142025);border:1px solid var(--line, #27424b)}.gt-coach{background:#3fb6c412;border:1px solid var(--accent, #3fb6c4)}.gt-who{margin:0 0 8px;font-size:12.5px;color:var(--dim, #9db4bc);letter-spacing:.7px;text-transform:uppercase}.gt-body{margin:0;font-size:17px;line-height:1.7;white-space:pre-wrap}.gt-compose{max-width:34em;transition:opacity .35s ease,transform .35s ease}.gt-compose.is-away{opacity:0;transform:translateY(8px);pointer-events:none;max-height:0;overflow:hidden;margin:0}.gt-compose textarea{display:block;width:100%;margin:0 0 12px;padding:14px 16px;font:inherit;font-size:17px;line-height:1.6;color:var(--text, #e9f1f3);background:var(--panel2, #1b2c33);border:1px solid var(--line, #27424b);border-radius:12px;resize:vertical}@keyframes gt-rise{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}@media(prefers-reduced-motion:reduce){.gt-turn{animation:none}}