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16px;border-radius:18px;font-size:.95rem}.bubble-user{align-self:flex-end;background:var(--primary);color:var(--on-primary);border-bottom-right-radius:6px}.bubble-assistant{align-self:flex-start;background:var(--surface-2);border-bottom-left-radius:6px}.typing{letter-spacing:.2em}.chat-form{display:flex;align-items:center;gap:8px;padding:6px 6px 6px 16px;border:1.5px solid var(--border);border-radius:999px;background:var(--surface)}.chat-form:focus-within{border-color:var(--primary)}.chat-form input{flex:1;min-width:0;font:inherit;padding:8px 0;border:none;background:none;color:var(--text)}.chat-form input:focus{outline:none}.send{display:grid;place-items:center;width:38px;height:38px;border-radius:999px;border:none;background:var(--primary);color:var(--on-primary);cursor:pointer;flex-shrink:0}.send:disabled{opacity:.4;cursor:not-allowed}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}.badges{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.guide summary{cursor:pointer;list-style:none;margin:0}.guide summary::-webkit-details-marker{display:none}.guide summary:after{content:"";margin-left:auto;width:8px;height:8px;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(45deg);transition:transform .15s ease}.guide[open] summary{margin-bottom:6px}.guide[open] summary:after{transform:rotate(-135deg)}.equation-display.small{font-size:1.5rem;padding:14px;box-shadow:none}a.btn{text-decoration:none}.auth-brand{display:flex;align-items:center;gap:12px;padding:28px var(--space) 0}.brand{font-weight:800;font-size:1.4rem;letter-spacing:-.02em;color:var(--text)}.intro{display:flex;flex-direction:column;align-items:center;text-align:center;gap:10px;padding:32px 8px 8px}.intro .tile{width:72px;height:72px;border-radius:22px;margin-bottom:6px}.intro p{color:var(--muted);max-width:32ch}.intro .tag{align-self:center}.segmented{display:flex;gap:4px;padding:4px;border-radius:999px;background:var(--surface-2);overflow-x:auto}.segmented button{flex:1;font:inherit;font-weight:600;font-size:.88rem;white-space:nowrap;padding:8px 12px;border:none;border-radius:999px;background:none;color:var(--muted);cursor:pointer}.segmented button[aria-selected=true],.segmented button[aria-checked=true]{background:var(--surface);color:var(--text);box-shadow:0 1px 3px #1118271f}.segmented button:focus-visible{outline:2px solid var(--primary);outline-offset:1px}.inline-form{display:flex;gap:8px}.inline-form input{flex:1;min-width:0}.inline-form .btn{padding:10px 18px;white-space:nowrap}.cohort{display:flex;flex-direction:column;gap:12px}.cohort-head{display:flex;align-items:center;gap:12px}.cohort-head strong{flex:1;font-size:1.05rem}.invite{display:flex;align-items:center;gap:8px;padding:6px 6px 6px 14px;border-radius:999px;background:var(--surface-2)}.invite-url{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:.85rem;color:var(--muted);font-family:ui-monospace,monospace}.disclosure{font:inherit;display:inline-flex;align-items:center;gap:4px;align-self:flex-start;padding:4px 0;border:none;background:none;color:var(--primary);font-weight:600;cursor:pointer}.disclosure[aria-expanded=true] .icon{transform:rotate(90deg)}.people{list-style:none;margin:0;padding:0;display:flex;flex-direction:column}.person{display:flex;gap:12px;padding:10px 0;border-top:1px solid var(--border)}.person:first-child{border-top:none}.avatar{display:grid;place-items:center;width:36px;height:36px;border-radius:999px;background:var(--primary-soft);color:var(--primary);font-weight:800;flex-shrink:0}.person-text{flex:1;min-width:0;display:flex;flex-direction:column;gap:4px}.person-text strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.person-text .muted{font-size:.84rem}.metrics{display:flex;flex-wrap:wrap;gap:8px}.metrics span{font-size:.82rem;color:var(--muted);background:var(--surface-2);border-radius:999px;padding:4px 10px}.metrics strong{color:var(--text)}.flag{font-size:.74rem;font-weight:700;color:var(--danger);background:var(--danger-soft);border-radius:999px;padding:2px 10px}.bars{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}.bars li{display:grid;grid-template-columns:auto 1fr 72px auto;align-items:center;gap:10px;font-size:.88rem}.bars li.correct .option-letter{background:var(--success);color:var(--on-success)}.bar-text{min-width:0}.bar{display:block;height:8px;border-radius:999px;background:var(--surface-2);overflow:hidden}.bar>span{display:block;height:100%;border-radius:999px;background:var(--primary)}.bars li.correct .bar>span{background:var(--success)}.bar.warm>span{background:var(--warn-line)}.empty{display:flex;flex-direction:column;align-items:center;gap:8px;padding:32px 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312px;max-width:1132px}.bottom-nav{top:0;bottom:0;right:auto;width:264px;flex-direction:column;justify-content:flex-start;gap:4px;padding:28px 16px;border-top:none;border-right:1px solid var(--border);background:color-mix(in srgb,var(--surface) 85%,transparent);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.bottom-nav a{flex:none;max-width:none;flex-direction:row;gap:12px;padding:12px 14px;border-radius:12px;font-size:.95rem}.bottom-nav a:hover{background:var(--surface-2);color:var(--text)}.bottom-nav a.active{background:var(--primary-soft)}.bottom-nav .nav-brand{display:flex;align-items:center;gap:12px;padding:0 8px 22px;font-weight:800;font-size:1.25rem;color:var(--text);background:none;letter-spacing:-.02em}.bottom-nav .nav-brand:hover{background:none}.step{padding-bottom:40px}h1{font-size:2rem}.page-header-row h1{font-size:1.9rem}.card{padding:20px 22px}.card.stem{padding:4px 0;font-size:1.15rem}.home{display:grid;grid-template-columns:1fr 1fr;gap:16px 20px;align-items:start}.home>*{grid-column:1 / -1}.home>.row-link{grid-column:auto}.explore-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.continue{padding:22px 24px}.continue strong{font-size:1.25rem}.concept-map{gap:12px}.stats{gap:16px}.focus-bar,.app:has(>.focus-bar) .content{max-width:720px;margin:0 auto;width:100%}.app:has(>.focus-bar) .content{padding:24px 32px 64px}.step-actions{background:none}.step-actions>*{max-width:656px}.feedback{left:max(0px,calc(50% - 360px));right:max(0px,calc(50% - 360px));padding-left:32px;padding-right:32px}.feedback>*{max-width:none}.sheet-backdrop{align-items:center}.sheet{border-radius:22px;max-height:80vh}.auth-shell{display:grid;grid-template-columns:minmax(420px,1fr) 1fr;min-height:100%}.auth-hero{display:flex;flex-direction:column;justify-content:center;gap:22px;padding:64px;color:#fff;background:radial-gradient(700px 500px at 0 100%,rgba(16,185,129,.55),transparent 70%),linear-gradient(150deg,#1d4ed8,#2563eb 55%,#0f766e)}.auth-hero .tile{background:#ffffff29;color:#fff;width:60px;height:60px;border-radius:18px}.auth-hero h2{font-size:2.6rem;line-height:1.1;letter-spacing:-.03em;font-weight:800;margin:0;max-width:14ch}.auth-hero ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:14px;max-width:42ch}.auth-hero li{display:flex;gap:12px;font-size:1.05rem;line-height:1.5;opacity:.95}.auth-hero li .icon{margin-top:3px}.auth-shell .app{display:flex;flex-direction:column;justify-content:center;max-width:520px;width:100%;margin:0 auto;padding:0 16px}.auth-shell .content{flex:none;padding:24px 32px 48px;max-width:none}.auth-shell .auth-brand{padding:0 32px}}.callout .misconception,.callout .example{background:var(--surface)}