.fd{--tone:var(--primary);overflow-x:clip}.fd[data-tone=violet],.fd-related__card[data-tone=violet]{--tone:var(--c-ela)}.fd[data-tone=sky],.fd-related__card[data-tone=sky]{--tone:var(--c-science)}.fd[data-tone=emerald],.fd-related__card[data-tone=emerald]{--tone:var(--c-math)}.fd[data-tone=amber],.fd-related__card[data-tone=amber]{--tone:var(--c-history)}.fd[data-tone=rose],.fd-related__card[data-tone=rose]{--tone:var(--c-languages)}.fd[data-tone=cyan],.fd-related__card[data-tone=cyan]{--tone:var(--c-coding)}.fd-hero{border-bottom:1px solid var(--border-faint);padding:clamp(32px,6vw,72px) 0 clamp(40px,6vw,80px);position:relative}.fd-hero__glow{pointer-events:none;background:radial-gradient(60% 55% at 85% 20%, color-mix(in oklab, var(--tone) 22%, transparent), transparent 70%), radial-gradient(45% 45% at 5% 90%, color-mix(in oklab, var(--primary) 12%, transparent), transparent 70%);position:absolute;inset:0}.fd-hero__grid{grid-template-columns:minmax(0,1fr);align-items:center;gap:40px;display:grid;position:relative}@media (min-width:1024px){.fd-hero__grid{grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);gap:64px}}.fd-hero__copy{flex-direction:column;align-items:flex-start;gap:18px;min-width:0;display:flex}.fd-crumbs{color:var(--fg-dim);flex-wrap:wrap;align-items:center;gap:6px;font-size:13px;display:flex}.fd-crumbs a{color:var(--fg-muted)}.fd-crumbs a:hover,.fd-crumbs [aria-current=page]{color:var(--fg)}.fd-chip{border-radius:var(--r-full);color:var(--fg);background:color-mix(in oklab, var(--tone) 12%, transparent);border:1px solid color-mix(in oklab, var(--tone) 30%, transparent);align-items:center;gap:10px;padding:6px 14px 6px 6px;font-size:14px;font-weight:600;display:inline-flex}.fd-chip__icon{border-radius:var(--r-full);width:32px;height:32px;color:var(--tone);background:color-mix(in oklab, var(--tone) 20%, transparent);justify-content:center;align-items:center;display:inline-flex}.fd-chip__icon svg{width:18px;height:18px}.fd-hero__title{max-width:18ch}.fd-hero__lede{margin:0}.fd-hero__ctas{flex-wrap:wrap;gap:12px;display:flex}.fd-hero__ctas .btn{min-height:44px}@media (max-width:480px){.fd-hero__ctas{width:100%}.fd-hero__ctas .btn{flex:100%;justify-content:center}}.fd-stats{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;width:100%;max-width:520px;margin:8px 0 0;display:grid}.fd-stat{border-radius:var(--r-lg);border:1px solid var(--border-faint);background:color-mix(in oklab, var(--bg-card) 80%, transparent);flex-direction:column-reverse;gap:2px;min-width:0;padding:12px;display:flex}.fd-stat dd{letter-spacing:-.02em;color:var(--tone);overflow-wrap:anywhere;margin:0;font-size:clamp(18px,2.4vw,24px);font-weight:700}.fd-stat dt{color:var(--fg-muted);font-size:12px;line-height:1.35}.fd-preview{border-radius:var(--r-xl);border:1px solid var(--border);background:var(--bg-card);width:100%;max-width:520px;box-shadow:0 30px 80px -20px color-mix(in oklab, var(--tone) 35%, transparent), 0 10px 30px #0000002e;justify-self:center;margin:0;overflow:hidden}.fd-preview__bar{border-bottom:1px solid var(--border-faint);background:var(--bg-elevated);gap:6px;padding:12px 16px;display:flex}.fd-preview__bar span{background:var(--border-strong);border-radius:50%;width:10px;height:10px}.fd-preview__title{font-family:var(--ff-mono);letter-spacing:.12em;text-transform:uppercase;color:var(--fg-muted);padding:16px 20px 0;font-size:11px}.fd-preview__body{padding:16px 20px 20px}.fd-preview__source{border-radius:var(--r-md);font-family:var(--ff-mono);color:var(--fg-2);background:var(--bg-inset);overflow-wrap:anywhere;margin:0 0 12px;padding:10px 12px;font-size:12px}.fd-preview__note{border-radius:var(--r-md);color:var(--fg-2);background:color-mix(in oklab, var(--tone) 10%, transparent);border-left:3px solid var(--tone);margin:16px 0 0;padding:10px 12px;font-size:13px;line-height:1.45}.fd-chat,.fd-meters,.fd-tiles,.fd-checks{margin:0;padding:0;list-style:none}.fd-chat{flex-direction:column;gap:10px;display:flex}.fd-chat__msg{border-radius:var(--r-lg);overflow-wrap:anywhere;max-width:85%;padding:10px 14px;font-size:14px;line-height:1.45}.fd-chat__msg[data-from=tutor]{color:var(--fg);background:color-mix(in oklab, var(--tone) 14%, var(--bg-elevated));border-bottom-left-radius:var(--r-sm);align-self:flex-start}.fd-chat__msg[data-from=student]{color:var(--on-primary);background:var(--primary-strong);border-bottom-right-radius:var(--r-sm);align-self:flex-end}.fd-meters{flex-direction:column;gap:14px;display:flex}.fd-meters__row{color:var(--fg-2);justify-content:space-between;gap:12px;margin-bottom:6px;font-size:13px;display:flex}.fd-meters__value{font-family:var(--ff-mono);color:var(--tone);white-space:nowrap;font-size:12px}.fd-meters__bar{border-radius:var(--r-full);appearance:none;background:var(--bg-inset);width:100%;height:8px;color:var(--tone);border:none;display:block;overflow:hidden}.fd-meters__bar::-webkit-progress-bar{background:var(--bg-inset);border-radius:var(--r-full)}.fd-meters__bar::-webkit-progress-value{background:var(--tone);border-radius:var(--r-full)}.fd-meters__bar::-moz-progress-bar{background:var(--tone);border-radius:var(--r-full)}.fd-tiles{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;display:grid}.fd-tiles li{border-radius:var(--r-lg);border:1px solid var(--border-faint);background:var(--bg-elevated);flex-direction:column;gap:4px;min-width:0;padding:14px;display:flex}.fd-tiles__value{letter-spacing:-.02em;color:var(--tone);overflow-wrap:anywhere;font-size:22px;font-weight:700}.fd-tiles__label{color:var(--fg-muted);font-size:12px}.fd-checks{flex-direction:column;gap:10px;display:flex}.fd-checks li{border-radius:var(--r-lg);border:1px solid var(--border-faint);background:var(--bg-elevated);align-items:flex-start;gap:12px;padding:12px;display:flex}.fd-checks li[data-state=active]{border-color:color-mix(in oklab, var(--tone) 55%, transparent);background:color-mix(in oklab, var(--tone) 10%, var(--bg-elevated))}.fd-checks li[data-state=locked]{opacity:.6}.fd-checks__dot{border:2px solid var(--border-strong);border-radius:50%;flex-shrink:0;width:12px;height:12px;margin-top:4px}.fd-checks li[data-state=done] .fd-checks__dot{border-color:var(--good);background:var(--good)}.fd-checks li[data-state=active] .fd-checks__dot{border-color:var(--tone);box-shadow:0 0 0 4px color-mix(in oklab, var(--tone) 22%, transparent)}.fd-checks__label{color:var(--fg);font-size:13px;font-weight:600;display:block}.fd-checks__detail{color:var(--fg-muted);font-size:13px;display:block}.fd-head{flex-direction:column;align-items:flex-start;gap:12px;margin-bottom:clamp(24px,4vw,40px);display:flex}.fd-highlights,.fd-audiences,.fd-related{grid-template-columns:minmax(0,1fr);gap:16px;display:grid}@media (min-width:640px){.fd-highlights,.fd-related{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (min-width:768px){.fd-audiences{grid-template-columns:repeat(3,minmax(0,1fr))}}@media (min-width:1024px){.fd-highlights,.fd-related{grid-template-columns:repeat(4,minmax(0,1fr))}}.fd-card{border-radius:var(--r-xl);border:1px solid var(--border-faint);background:var(--bg-card);min-width:0;transition:border-color .18s var(--ease), transform .18s var(--ease);flex-direction:column;gap:10px;padding:24px;display:flex}.fd-card:hover{border-color:color-mix(in oklab, var(--tone) 45%, transparent);transform:translateY(-2px)}.fd-card .body{margin:0}.fd-card__num{font-family:var(--ff-mono);color:var(--tone);font-size:12px;font-weight:600}.fd-band{background:var(--bg-elevated);border-top:1px solid var(--border-faint);border-bottom:1px solid var(--border-faint)}.fd-steps{counter-reset:none;grid-template-columns:minmax(0,1fr);gap:24px;margin:0;padding:0;list-style:none;display:grid}@media (min-width:768px){.fd-steps{grid-template-columns:repeat(3,minmax(0,1fr));gap:32px}}.fd-step{flex-direction:column;gap:8px;display:flex;position:relative}.fd-step .body{margin:0}.fd-step__num{border-radius:var(--r-full);width:44px;height:44px;color:var(--on-primary);background:var(--tone);box-shadow:0 0 0 6px color-mix(in oklab, var(--tone) 18%, transparent);justify-content:center;align-items:center;margin-bottom:6px;font-weight:700;display:inline-flex}@media (min-width:768px){.fd-step:not(:last-child):after{content:"";background:linear-gradient(90deg, color-mix(in oklab, var(--tone) 50%, transparent), transparent);height:2px;position:absolute;top:22px;left:60px;right:-20px}}.fd-audience__icon{--aud:var(--primary);border-radius:var(--r-md);width:44px;height:44px;color:var(--aud);background:color-mix(in oklab, var(--aud) 15%, transparent);justify-content:center;align-items:center;display:inline-flex}.fd-audience__icon[data-who=students]{--aud:var(--c-ela)}.fd-audience__icon[data-who=teachers]{--aud:var(--c-math)}.fd-audience__icon[data-who=parents]{--aud:var(--c-history)}.fd-audience__icon svg{width:22px;height:22px}.fd-link{min-height:44px;color:var(--tone);align-items:center;gap:6px;margin-top:auto;font-size:14px;font-weight:600;display:inline-flex}.fd-link .arrow{width:14px;height:14px}.fd-faq{grid-template-columns:minmax(0,1fr);gap:8px;display:grid}@media (min-width:1024px){.fd-faq{grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:48px}}.fd-faq__list{flex-direction:column;gap:12px;display:flex}.fd-faq__item{border-radius:var(--r-lg);border:1px solid var(--border-faint);background:var(--bg-card)}.fd-faq__item summary{min-height:44px;color:var(--fg);cursor:pointer;justify-content:space-between;align-items:center;gap:16px;padding:16px 20px;font-size:16px;font-weight:600;list-style:none;display:flex}.fd-faq__item summary::-webkit-details-marker{display:none}.fd-faq__item summary:after{content:"+";color:var(--tone);transition:transform .18s var(--ease);flex-shrink:0;font-size:22px;font-weight:400}.fd-faq__item[open] summary:after{transform:rotate(45deg)}.fd-faq__item .body{margin:0;padding:0 20px 18px}.fd-related__card{border-radius:var(--r-xl);border:1px solid var(--border-faint);background:var(--bg-card);color:var(--fg);min-width:0;transition:border-color .18s var(--ease), transform .18s var(--ease);align-items:flex-start;gap:14px;padding:20px;display:flex}.fd-related__card:hover{border-color:color-mix(in oklab, var(--tone) 50%, transparent);transform:translateY(-2px)}.fd-related__icon{border-radius:var(--r-md);width:44px;height:44px;color:var(--tone);background:color-mix(in oklab, var(--tone) 16%, transparent);flex-shrink:0;justify-content:center;align-items:center;display:inline-flex}.fd-related__icon svg{width:22px;height:22px}.fd-related__text{flex-direction:column;gap:4px;min-width:0;display:flex}.fd-cta{border-radius:var(--r-xl);text-align:center;border:1px solid color-mix(in oklab, var(--tone) 30%, transparent);background:radial-gradient(80% 120% at 50% 0%, color-mix(in oklab, var(--tone) 18%, transparent), transparent 70%), var(--bg-card);flex-direction:column;align-items:center;gap:16px;padding:clamp(32px,6vw,64px) clamp(20px,5vw,48px);display:flex}.fd-cta .lede{margin:0}.fd-cta__actions{justify-content:center}@media (prefers-reduced-motion:reduce){.fd-card,.fd-related__card,.fd-faq__item summary:after{transition:none}.fd-card:hover,.fd-related__card:hover{transform:none}}