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.4rem;font-size:.72rem}.lesson-link{text-align:left;width:100%;font:inherit;cursor:pointer;color:var(--ink);background:0 0;border:0;border-radius:10px;align-items:center;gap:.6rem;padding:.55rem .6rem;display:flex}.lesson-link:hover{background:var(--chip)}.lesson-link.is-active{background:color-mix(in oklab, var(--accent) 16%, var(--surface-2))}.lesson-link .tick{border:1.5px solid var(--line-strong);width:20px;height:20px;color:var(--muted-2);border-radius:50%;flex:none;place-items:center;font-size:.7rem;display:grid}.lesson-link.done .tick{background:var(--teal);border-color:var(--teal);color:#06111f}.lesson-link span.t{font-size:.9rem}.reader{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:clamp(1.2rem,1rem + 2vw,2rem)}.reader h3{letter-spacing:-.02em;margin:0 0 .4rem;font-size:clamp(1.3rem,1rem + 1.6vw,1.8rem)}.reader .concept{color:var(--ink);font-size:1.05rem;line-height:1.6}.reader 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.tag{text-transform:uppercase;letter-spacing:.06em;color:var(--muted-2);font-size:.72rem;position:absolute;top:1rem;left:1.2rem}.flashcard .face p{letter-spacing:-.01em;margin:0;font-size:1.3rem;font-weight:700;line-height:1.4}.flashcard .back{background:linear-gradient(160deg, color-mix(in oklab, var(--teal) 14%, var(--surface)), var(--surface));transform:rotateY(180deg)}.deck-nav{justify-content:center;align-items:center;gap:1rem;display:flex}.deck-nav .count{color:var(--muted);text-align:center;min-width:60px;font-size:.9rem}.quiz-q{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);max-width:620px;margin:0 auto;padding:clamp(1.2rem,1rem + 2vw,1.8rem)}.quiz-q .qnum{text-transform:uppercase;letter-spacing:.06em;color:var(--muted-2);font-size:.76rem}.quiz-q h3{letter-spacing:-.01em;margin:.4rem 0 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var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:1.4rem}.dash .big b{letter-spacing:-.03em;font-size:2.6rem;font-weight:900;display:block}.dash .big.streak b{color:var(--amber)}.dash .big.xp b{color:var(--teal)}.dash .big.lvl b{color:var(--indigo)}.dash .big.done b{color:var(--rose)}.dash .big span{color:var(--muted);font-size:.85rem}.track-progress{gap:.7rem;display:grid}.tp-row{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm);align-items:center;gap:.9rem;padding:.8rem 1rem;display:flex}.tp-row .ico{font-size:1.3rem}.tp-row .meta{flex:1}.tp-row .meta b{font-size:.95rem}.tp-bar{background:var(--line);border-radius:999px;height:8px;margin-top:.4rem;overflow:hidden}.tp-bar i{background:var(--cat,var(--accent));height:100%;transition:width var(--dur) var(--ease);display:block}.tp-row .pct{font-variant-numeric:tabular-nums;font-weight:800}.empty{text-align:center;color:var(--muted);padding:3rem 1rem}.toast{z-index:60;background:var(--surface-solid);color:var(--ink);border:1px solid var(--line-strong);box-shadow:var(--shadow);transition:transform .45s var(--ease);border-radius:999px;align-items:center;gap:.5rem;padding:.7rem 1.2rem;font-weight:700;display:flex;position:fixed;bottom:1.6rem;left:50%;transform:translate(-50%)translateY(140%)}.toast.show{transform:translate(-50%)translateY(0)}.toast .xp-badge{color:var(--teal)}.site-footer{border-top:1px solid var(--line);margin-top:4rem}.site-footer .wrap{flex-wrap:wrap;align-items:center;gap:1rem 2rem;padding-block:1.8rem;display:flex}.footer-brand{flex-direction:column;gap:.2rem;display:flex}.footer-logo-img{width:auto;height:26px}:root[data-theme=dark] .footer-logo-light,:root[data-theme=light] .footer-logo-dark{display:none}.footer-brand p{color:var(--muted-2);margin:0;font-size:.78rem}.footer-links,.footer-social{align-items:center;gap:1rem;display:flex}.footer-links{margin-left:auto}.footer-links a{color:var(--muted);font-size:.82rem;text-decoration:none}.footer-links a:hover{color:var(--ink)}.footer-social a{color:var(--muted);transition:color var(--dur) var(--ease), transform var(--dur) var(--ease)}.footer-social a:hover{color:var(--ink);transform:translateY(-2px)}@media (max-width:860px){.hero-inner{grid-template-columns:1fr}.hero-card{order:-1}.lesson-layout{grid-template-columns:1fr}.module-list{position:static}}@media (max-width:520px){.footer-links{margin-left:0}.stat b{font-size:1.3rem}}@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}.flashcard-inner{transition:none}}.view{animation:fade var(--dur) var(--ease)}@keyframes fade{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}.header-account{align-items:center;display:inline-flex;position:relative}.header-account-signin{cursor:pointer;white-space:nowrap;min-height:38px;font:inherit;color:#06111f;background:linear-gradient(135deg, var(--teal), var(--indigo));transition:transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);border:1px solid #0000;border-radius:999px;align-items:center;padding:0 15px;font-size:.82rem;font-weight:800;display:inline-flex}.header-account-signin:hover,.header-account-signin:focus-visible{transform:translateY(-1px);box-shadow:0 10px 24px #18c9b452}.header-account-chip{cursor:pointer;min-height:38px;font:inherit;color:var(--ink);background:var(--chip);border:1px solid var(--line);transition:border-color var(--dur) var(--ease);border-radius:999px;align-items:center;gap:8px;padding:0 12px 0 5px;font-size:.82rem;font-weight:800;display:inline-flex}.header-account-chip:hover,.header-account-chip:focus-visible{border-color:var(--line-strong)}.header-account-avatar{color:#06111f;background:linear-gradient(135deg, var(--teal), var(--indigo));border-radius:50%;justify-content:center;align-items:center;width:28px;height:28px;font-size:.78rem;font-weight:900;display:inline-flex}.header-account-name{text-overflow:ellipsis;white-space:nowrap;max-width:130px;overflow:hidden}.header-account-menu{z-index:80;border:1px solid var(--line-strong);background:var(--surface-solid);min-width:184px;box-shadow:var(--shadow);border-radius:14px;flex-direction:column;gap:2px;padding:6px;display:flex;position:absolute;top:calc(100% + 8px);right:0}.header-account-menu[hidden]{display:none}.header-account-item{text-align:left;cursor:pointer;width:100%;font:inherit;color:var(--ink);background:0 0;border:0;border-radius:10px;padding:9px 12px;font-size:.82rem;font-weight:700;text-decoration:none;display:block}.header-account-item:hover,.header-account-item:focus-visible{background:var(--chip)}