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var(--s-2);color:var(--accent);font-size:12px;font-weight:800;letter-spacing:.07em;text-transform:uppercase}.vx-diagnostic__header .vx-diagnostic__lead{max-width:62ch;margin-bottom:0}.vx-diagnostic .vx-predict+.vx-predict{margin-top:var(--s-3)}@media (max-width:720px){.vx-diagnostic__header{align-items:stretch;flex-direction:column}}.vx-ladder{margin-top:var(--s-3);padding:var(--s-3) var(--s-4);border:1px solid color-mix(in srgb,var(--accent) 26%,transparent);border-radius:10px;background:color-mix(in srgb,var(--accent) 5%,transparent)}.vx-ladder__rung{font-size:12.5px;font-weight:600;letter-spacing:.04em;text-transform:uppercase}.vx-ladder__lead,.vx-ladder__rung{margin:0 0 var(--s-2);color:var(--text-secondary)}.vx-ladder__lead{font-size:13.5px}.vx-ladder__steps{margin:var(--s-2) 0;padding-left:1.4em}.vx-ladder__steps li{margin:4px 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button:hover{border-color:var(--accent);color:var(--text-primary)}.vx-tutor-scope{font-size:10.5px;font-weight:800;letter-spacing:.07em;text-transform:uppercase;color:var(--text-muted);align-self:center}.vx-predict__q{font-size:16.5px;font-weight:700;margin:0 0 4px}.vx-opts{display:grid;grid-gap:9px;gap:9px}.vx-opts button{text-align:left;padding:13px 16px;border-radius:11px;border:1.5px solid var(--hairline);background:var(--surface-2);color:var(--text-primary);font-size:15px;font-weight:600;cursor:pointer}.vx-opts button:hover:not(:disabled),.vx-opts button[data-picked]{border-color:var(--card-predict)}.vx-opts button[data-right]{border-color:var(--energy);background:color-mix(in srgb,var(--energy) 12%,var(--surface-2))}.vx-opts button[data-wrong]{border-color:var(--danger,#e35b5b)}.vx-reveal-note{border-radius:11px;padding:12px 15px;font-size:14px;border:1px solid;margin-top:10px}.vx-reveal-note.good{border-color:color-mix(in srgb,var(--energy) 45%,transparent);background:color-mix(in srgb,var(--energy) 9%,transparent)}.vx-reveal-note.info{border-color:color-mix(in srgb,var(--warning) 45%,transparent);background:color-mix(in srgb,var(--warning) 9%,transparent)}.vx-confirm-row{display:flex;gap:9px;align-items:center}.vx-btn-mini{border:1.5px solid var(--hairline);background:var(--surface-2);border-radius:999px;padding:8px 15px;font-size:13px;font-weight:700;color:var(--text-secondary);cursor:pointer}.vx-btn-mini.yes{border-color:color-mix(in srgb,var(--energy) 55%,transparent);color:var(--energy)}.vx-btn-mini:hover{border-color:var(--accent);color:var(--text-primary)}.vx-confirmed{font-size:13px;font-weight:800;color:var(--energy)}.vx-card-actions{display:flex;justify-content:space-between;align-items:center;max-width:1220px;margin:14px auto 0;gap:10px}.vx-btn{display:inline-flex;align-items:center;gap:8px;min-height:46px;padding:9px 20px;border-radius:999px;border:1px solid var(--hairline);background:var(--surface-2);color:var(--text-primary);font-weight:600;font-size:14px;cursor:pointer}.vx-btn:disabled{opacity:.4;cursor:not-allowed}.vx-btn.primary{background:linear-gradient(135deg,var(--accent),color-mix(in srgb,var(--accent) 70%,var(--vector)));border-color:transparent;color:#fff;box-shadow:var(--shadow)}.vx-btn.ghost{background:transparent;border-color:transparent;color:var(--text-secondary)}.vx-angles__tabs button{position:relative}.vx-angles__tabs button[data-unseen]:after{content:"";position:absolute;top:5px;right:5px;width:7px;height:7px;border-radius:50%;background:var(--accent)}.vx-focusview{position:fixed;inset:0;z-index:80;background:color-mix(in srgb,var(--bg) 88%,transparent);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);display:flex;align-items:center;justify-content:center;padding:3vh 3vw}.vx-focusview__inner{background:var(--surface-1);border:1px solid 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(max-width:720px){.vx-mode-row{align-items:flex-end}.vx-control-group{align-items:flex-start;flex-direction:column}.vx-control-group--activities{padding-left:0;border-left:0}.vx-workspace{width:min(calc(100% - 24px),1220px);min-height:calc(100vh - 210px);scroll-margin-top:156px}}@media (min-width:1100px){.vx-lesson .vz-lesson__header,.vx-mode-row{padding:0 64px}}.vx-lesson .vz-prose{max-width:none}.vx-lesson .vz-prose>:first-child{margin-top:0}.vx-lesson .vz-definition{border:1px solid color-mix(in srgb,var(--vector) 40%,transparent);background:color-mix(in srgb,var(--vector) 7%,transparent);border-radius:12px;padding:13px 16px;margin:13px 0}.vx-lesson .vz-definition__term{margin:0 0 4px}.vx-lesson .vz-definition__term dfn{font-style:normal;font-weight:800;color:var(--text-primary)}.vx-lesson .vz-definition__term:before{content:"Definition";display:block;font-size:10.5px;font-weight:800;text-transform:uppercase;letter-spacing:.09em;color:var(--vector);margin-bottom:5px}.vx-lesson 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40%,transparent);background:color-mix(in srgb,var(--card-analogy) 8%,transparent)}.vx-lesson .vz-callout--accent .vz-callout__label{color:var(--card-analogy)}.vx-lesson .vz-callout--energy{border-color:color-mix(in srgb,var(--card-check) 40%,transparent);background:color-mix(in srgb,var(--card-check) 7%,transparent)}.vx-lesson .vz-callout--energy .vz-callout__label{color:var(--card-check)}.vx-lesson .vz-callout--warning{border-color:color-mix(in srgb,var(--warning) 45%,transparent);background:color-mix(in srgb,var(--warning) 8%,transparent)}.vx-lesson .vz-callout--warning .vz-callout__label{color:var(--warning)}.vx-lesson .vz-callout__body{color:var(--text-secondary);font-size:16px;line-height:1.65}.vx-lesson .vz-callout__body :first-child{margin-top:0}.vx-lesson .vz-formula-grid{display:flex;flex-direction:column;gap:13px}.vx-lesson .vz-formula{border:1px solid color-mix(in srgb,var(--energy) 40%,transparent);background:color-mix(in srgb,var(--energy) 6%,transparent);border-radius:12px;padding:16px;margin:13px 0;text-align:center}.vx-lesson .vz-formula__math{font-size:1.1em}.vx-lesson .vz-formula__pills{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin-top:10px}.vx-lesson .vz-formula__pill{font-size:12.5px;padding:5px 12px;border-radius:999px;border:1px solid var(--hairline);background:var(--surface-2);color:var(--text-secondary);white-space:nowrap}.vx-lesson .vz-formula__note{margin-top:10px;font-size:13px;color:var(--text-muted)}.vx-lesson .vz-worked{border-left:3px solid var(--card-check);background:color-mix(in srgb,var(--card-check) 7%,transparent);border-radius:0 12px 12px 0;padding:13px 16px;margin:13px 0}.vx-bar{position:-webkit-sticky;position:sticky;top:0;z-index:50;flex-wrap:wrap;gap:12px;min-height:58px;padding:8px 18px;margin-bottom:6px;background:color-mix(in srgb,var(--surface-1) 96%,transparent);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border-bottom:1px solid var(--hairline);box-shadow:0 1px 0 color-mix(in srgb,var(--text-primary) 5%,transparent)}.vx-bar,.vx-bar__brand{display:flex;align-items:center}.vx-bar__brand{gap:8px;font-weight:800;font-size:18px;letter-spacing:-.03em;color:var(--text-primary);text-decoration:none;white-space:nowrap}.vx-bar__word{position:absolute;width:1px;height:1px;overflow:hidden;-webkit-clip-path:inset(50%);clip-path:inset(50%);white-space:nowrap}.vz-logo-wordmark--lesson{width:146px;height:40px}.vx-bar__title{flex:0 1 auto;min-width:9rem;max-width:min(34vw,440px);overflow:hidden;text-overflow:ellipsis;font-size:13.5px}.vx-bar__chip,.vx-bar__title{white-space:nowrap;font-weight:700;color:var(--text-secondary)}.vx-bar__chip{font-size:11.5px;padding:4px 10px;border-radius:999px;background:var(--surface-2);border:1px solid var(--hairline);text-decoration:none}.vx-bar__chip:hover{border-color:var(--accent);color:var(--text-primary)}.vx-bar__chip--core{color:var(--energy)}.vx-bar__chip--cta{background:var(--accent);border-color:var(--accent);color:#fff}.vx-bar__chip--cta:hover{filter:brightness(1.06);color:#fff}.vx-bar__grow{flex:1 1}.vx-guest-banner{max-width:1500px;margin:0 auto 8px;padding:8px 20px;font-size:13px;color:var(--text-secondary);background:color-mix(in srgb,var(--accent) 8%,transparent);border-bottom:1px solid color-mix(in srgb,var(--accent) 22%,transparent);text-align:center}.vx-guest-banner__cta{font-weight:700;color:var(--accent);text-decoration:none;white-space:nowrap}.vx-guest-banner__cta:hover{text-decoration:underline}.vx-lesson .vz-lesson__submeta{margin:6px 0 0;color:var(--text-muted);font-size:13.5px}@media (max-width:720px){.vx-bar{flex-wrap:wrap;row-gap:6px;padding:8px 12px}.vx-bar__title{flex-grow:1;flex-shrink:1;flex-basis:calc(100% - 128px);min-width:6rem;max-width:none;overflow:visible;text-overflow:clip;white-space:normal;line-height:1.3}.vx-bar__chip[href="/dashboard"],.vx-bar__chip[href="/learn"],.vx-bar__grow{display:none}.vz-logo-wordmark--lesson{width:116px;height:34px}.vx-lesson .vz-lesson__submeta{display:none}}.vx-experience{max-width:100%;overflow-x:clip}.vx-card__visual img,.vx-card__visual svg,.vx-card__vslot img,.vx-card__vslot svg{max-width:100%;height:auto}.vx-feedback{display:flex;align-items:center;gap:8px;margin-top:18px;padding-top:14px;border-top:1px solid var(--hairline);font-size:var(--text-sm);color:var(--text-muted)}.vx-feedback__q{font-weight:500}.vx-feedback__btn{border:1px solid var(--hairline);background:transparent;border-radius:var(--radius-sm);padding:3px 9px;cursor:pointer;line-height:1;font-size:1rem;transition:border-color .15s ease,background .15s ease,transform .1s ease}.vx-feedback__btn:hover{transform:translateY(-1px)}.vx-feedback__btn[data-on]{border-color:var(--vector);background:color-mix(in srgb,var(--vector) 14%,transparent)}.vx-feedback__thanks{color:var(--energy);font-weight:500}.vx-qflag{margin-top:12px}.vx-qna{margin-top:16px;padding-top:14px;border-top:1px solid var(--hairline);font-size:var(--text-sm)}.vx-qna__summary{display:flex;align-items:center;gap:8px;cursor:pointer;font-weight:500;color:var(--text-secondary);list-style:none}.vx-qna__summary::-webkit-details-marker{display:none}.vx-qna__summary:before{content:"💬";font-size:.95rem}.vx-qna__count{border:1px solid var(--hairline);border-radius:999px;padding:0 7px}.vx-qna__count,.vx-qna__note{font-size:12px;color:var(--text-muted)}.vx-qna__note{margin:8px 0 4px;font-style:italic}.vx-qna__list{list-style:none;margin:0;padding:0;display:grid;grid-gap:10px;gap:10px}.vx-qna__item{border-left:2px solid var(--hairline);padding-left:12px}.vx-qna__q{margin:0 0 3px;font-weight:500}.vx-qna__a{margin:0;color:var(--text-secondary)}.vz-lsum__backdrop{position:fixed;inset:0;z-index:120;display:grid;place-items:start center;padding:40px 16px;overflow:auto;background:color-mix(in srgb,#000 52%,transparent);-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px)}.vz-lsum{width:min(760px,100%);border:1px solid var(--hairline);border-radius:16px;background:var(--surface-1);box-shadow:var(--shadow);overflow:hidden}.vz-lsum__bar{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 12px;border-bottom:1px solid var(--hairline)}.vz-lsum__print{border:1px solid var(--vector);background:color-mix(in srgb,var(--vector) 14%,transparent);color:var(--text-primary);border-radius:10px;padding:7px 12px;font:inherit;font-weight:650;font-size:var(--text-sm);cursor:pointer}.vz-lsum__close{border:none;background:transparent;color:var(--text-muted);font-size:16px;cursor:pointer;padding:4px 8px;border-radius:8px}.vz-lsum__close:hover{background:var(--surface-2);color:var(--text-primary)}.vz-lsum__sheet{padding:28px 32px 32px}.vz-lsum__eyebrow{margin:0;font-size:var(--text-xs);font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--vector)}.vz-lsum__head h2{margin:4px 0;font-size:24px}.vz-lsum__meta{margin:0;font-size:var(--text-sm);color:var(--text-muted)}.vz-lsum__sec{margin-top:22px}.vz-lsum__sec h3{margin:0 0 8px;font-size:var(--text-sm);font-weight:700;letter-spacing:.03em;text-transform:uppercase;color:var(--text-secondary)}.vz-lsum__sec ul{margin:0;padding-left:18px;display:grid;grid-gap:6px;gap:6px}.vz-lsum__sec li{font-size:var(--text-md);line-height:1.5;color:var(--text-primary)}.vz-lsum__formulas{list-style:none;padding-left:0!important}.vz-lsum__formulas code{font-size:16px;font-weight:700;color:var(--text-primary);background:var(--surface-2);padding:2px 8px;border-radius:8px}.vz-lsum__vars{display:block;margin-top:3px;font-size:var(--text-sm);color:var(--text-muted)}.vz-lsum__mistakes{list-style:none;padding-left:0!important}.vz-lsum__mistakes li{display:grid;grid-gap:2px;gap:2px;padding:8px 0;border-bottom:1px solid var(--hairline)}.vz-lsum__wrong{color:var(--danger);font-weight:600}.vz-lsum__right{color:var(--energy)}.vz-lsum__foot{margin-top:26px;padding-top:12px;border-top:1px solid var(--hairline);font-size:var(--text-xs);color:var(--text-muted)}@media print{body *{visibility:hidden!important}.vz-lsum__sheet,.vz-lsum__sheet *{visibility:visible!important}.vz-lsum__sheet{position:absolute;inset:0;margin:0;padding:24px 28px;background:#fff;color:#111;max-width:none}.vz-lsum__bar{display:none!important}.vz-lsum__eyebrow{color:#2d6fc4}.vz-lsum__formulas code,.vz-lsum__head h2,.vz-lsum__sec li{color:#111!important;background:transparent!important}.vz-lsum__foot,.vz-lsum__meta,.vz-lsum__sec h3,.vz-lsum__vars{color:#444!important}.vz-lsum__wrong{color:#b3261e!important}.vz-lsum__right{color:#0a7d55!important}}