:root{--bg:#fff8ee;--surface:#fff;--ink:#2b2620;--muted:#7a7064;--brand:#2f6fed;--brand-ink:#fff;--correct:#1f9d57;--correct-bg:#e3f7ec;--wrong:#d9483b;--wrong-bg:#fbe7e4;--accent:#f6a609;--line:#ece2d2;--radius:18px;--shadow:0 6px 20px #3c2d141a;color:var(--ink);background:var(--bg);font-family:Nunito,Segoe UI,system-ui,-apple-system,sans-serif}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);line-height:1.55}a{color:var(--brand)}button{cursor:pointer;font-family:inherit}.app-shell{max-width:820px;margin:0 auto;padding:16px 20px 64px}.topbar{justify-content:space-between;align-items:center;padding:12px 0 20px;display:flex}.topbar .brand{color:var(--brand);font-size:1.4rem;font-weight:800;text-decoration:none}.topbar .brand span{color:var(--accent)}.card-surface{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}h1{margin:0 0 8px;font-size:2rem}h2{margin:0 0 8px;font-size:1.4rem}.muted{color:var(--muted)}.btn{background:var(--brand);color:var(--brand-ink);border:none;border-radius:999px;align-items:center;gap:8px;padding:14px 24px;font-size:1.05rem;font-weight:800;transition:transform 50ms,filter .15s;display:inline-flex}.btn:hover{filter:brightness(1.05)}.btn:active{transform:scale(.98)}.btn:disabled{opacity:.5;cursor:default}.btn.secondary{color:var(--ink);background:#efe6d6}.btn.big{padding:18px 32px;font-size:1.2rem}.btn.block{justify-content:center;width:100%;display:flex}.lesson-list{gap:16px;display:grid}.lesson-tile{color:inherit;text-decoration:none;display:block}.lesson-tile:hover{transition:transform .1s;transform:translateY(-2px)}.chips{flex-wrap:wrap;gap:6px;margin-top:10px;display:flex}.chip{color:var(--muted);background:#f1eadc;border-radius:999px;padding:3px 10px;font-size:.78rem;font-weight:700}.filter-row{flex-wrap:wrap;gap:10px;display:flex}.filter-select{border:2px solid var(--line);background:var(--surface);color:var(--ink);border-radius:12px;padding:10px 14px;font-family:inherit;font-size:1rem;font-weight:700}.filter-select:focus{border-color:var(--brand);outline:none}.lesson-grid{grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:18px;display:grid}.lesson-card{color:inherit;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);flex-direction:column;text-decoration:none;transition:transform .1s;display:flex;overflow:hidden}.lesson-card:hover{transform:translateY(-3px)}.lesson-card-cover{aspect-ratio:16/10;background:#f1eadc}.lesson-card-cover img{object-fit:cover;width:100%;height:100%;display:block}.lesson-card-cover-fallback{justify-content:center;align-items:center;width:100%;height:100%;font-size:2.5rem;display:flex}.lesson-card-body{flex-direction:column;gap:6px;padding:16px;display:flex}.lesson-card-body h3{margin:0;font-size:1.15rem;line-height:1.25}.lesson-card-place{margin:0;font-size:.85rem}.lesson-card-summary{margin:0;font-size:.95rem}.lesson-card-stats{color:var(--accent);margin:2px 0 0;font-size:.85rem;font-weight:700}.lesson-grid.zoom-2{grid-template-columns:repeat(auto-fill,minmax(168px,1fr));gap:14px}.lesson-grid.zoom-3{grid-template-columns:repeat(auto-fill,minmax(116px,1fr));gap:10px}.lesson-grid.zoom-2 .lesson-card-body{gap:4px;padding:10px}.lesson-grid.zoom-2 .lesson-card-body h3{font-size:1rem}.lesson-grid.zoom-3 .lesson-card-body{gap:2px;padding:7px 8px}.lesson-grid.zoom-3 .lesson-card-body h3{font-size:.82rem;line-height:1.2}.lesson-grid.zoom-3 .lesson-card-summary,.lesson-grid.zoom-3 .lesson-card-place,.lesson-grid.zoom-3 .lesson-card-importance,.lesson-grid.zoom-3 .lesson-card-stats,.lesson-grid.zoom-3 .lesson-card .chips{display:none}.lesson-grid.zoom-2 .lesson-card,.lesson-grid.zoom-3 .lesson-card{transition:transform .12s,box-shadow .12s}.lesson-grid.zoom-2 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img{object-fit:cover;width:100%;height:100%}.timeline-card-body{flex-direction:column;gap:2px;min-width:0;display:flex}.timeline-card-year{color:var(--accent);font-size:.72rem;font-weight:800}.timeline-card-title{font-size:.92rem;font-weight:800;line-height:1.15}.timeline-card-meta{color:var(--muted);margin-top:auto;font-size:.75rem}.lesson-body p{font-size:1.15rem}.lesson-body h2{color:var(--brand);margin:1.4em 0 .3em;font-size:1.5rem}.lesson-body h3{margin:1.1em 0 .3em;font-size:1.2rem}.lesson-body h1{margin:1.2em 0 .3em;font-size:1.8rem}.img-placeholder{text-align:center;border:2px dashed var(--line);color:var(--muted);background:#fdf6ea;border-radius:14px;flex-direction:column;justify-content:center;align-items:center;gap:8px;padding:28px 20px;display:flex}.img-placeholder span:first-child{font-size:2rem}.lesson-body img{border:1px solid var(--line);border-radius:14px;width:100%;margin:6px 0 4px}.lesson-body figure{margin:18px 0}.lesson-body figcaption{color:var(--muted);text-align:center;font-size:.95rem}.study-progress{background:#efe6d6;border-radius:999px;height:10px;margin-bottom:18px;overflow:hidden}.study-progress>span{background:var(--accent);height:100%;transition:width .3s;display:block}.flash-front{margin:8px 0 24px;font-size:1.6rem;font-weight:800}.speak-btn{vertical-align:middle;cursor:pointer;background:#efe6d6;border:none;border-radius:999px;margin-left:10px;padding:6px 10px;font-size:1rem;line-height:1}.speak-btn:hover{filter:brightness(1.05)}.hearing{min-height:56px;color:var(--brand);background:#eef4ff;border-radius:14px;align-items:center;padding:12px 16px;font-size:1.2rem;font-weight:700;display:flex}.text-toggle{color:var(--muted);cursor:pointer;background:0 0;border:none;margin:12px auto 0;font-size:.95rem;text-decoration:underline;display:block}.answer-input{border:2px solid var(--line);border-radius:14px;outline:none;width:100%;padding:14px 16px;font-size:1.3rem}.answer-input:focus{border-color:var(--brand)}.btn.mic.listening{background:var(--wrong);color:#fff;animation:1.1s ease-in-out infinite pulse}@keyframes pulse{0%,to{box-shadow:0 0 #d9483b80}50%{box-shadow:0 0 0 10px #d9483b00}}.choices{gap:12px;display:grid}.choice{text-align:left;border:2px solid var(--line);background:var(--surface);color:var(--ink);border-radius:14px;padding:16px 18px;font-size:1.15rem;font-weight:700}.choice:hover{border-color:var(--brand)}.choice.correct{border-color:var(--correct);background:var(--correct-bg)}.choice.wrong{border-color:var(--wrong);background:var(--wrong-bg)}.choice:disabled{cursor:default}.feedback{border-radius:14px;margin-top:18px;padding:16px 18px;font-weight:700}.feedback.correct{background:var(--correct-bg);color:var(--correct)}.feedback.wrong{background:var(--wrong-bg);color:var(--wrong)}.feedback.prompt{color:var(--brand);background:#eef4ff}.mini-lesson{background:#fff7e6;border:1px solid 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td.flag{color:var(--wrong);font-weight:800}.stat-grid{grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:14px;display:grid}.stat-tile{background:var(--surface);border:1px solid var(--line);text-align:center;border-radius:14px;padding:16px}.stat-value{color:var(--brand);font-size:1.8rem;font-weight:800}.stat-label{color:var(--muted);margin-top:2px;font-size:.85rem}.stack{gap:16px;display:grid}.row{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.center{text-align:center}.big-emoji{font-size:3rem}@media (width<=640px){.app-shell{padding:8px 12px 40px}.stack{gap:12px}.card-surface{padding:16px}.flash-front{margin:4px 0 14px;font-size:1.25rem}.answer-input{padding:12px 14px;font-size:1.1rem}.btn.big{padding:14px 20px;font-size:1.05rem}.choice{padding:12px 14px;font-size:1.05rem}.feedback{padding:12px 14px}.topbar{padding:8px 0 10px}.topbar .brand{white-space:nowrap;font-size:1.1rem}h1{font-size:1.4rem}.mini-lesson{padding:12px 14px;font-size:.95rem}.feedback{font-size:.98rem}}body.studying .topbar{display:none}body.studying .app-shell{padding-top:14px}.admin-tabs{flex-wrap:wrap;gap:6px;display:flex}.admin-tab{border:1px solid var(--line);background:var(--surface);color:var(--muted);cursor:pointer;border-radius:999px;padding:8px 16px;font-size:.95rem;font-weight:700}.admin-tab.active{background:var(--brand);color:#fff;border-color:var(--brand)}.bar-chart{align-items:flex-end;gap:6px;display:flex}.bar-col{flex-direction:column;flex:1;align-items:center;gap:4px;display:flex}.bar-track{align-items:flex-end;width:100%;display:flex}.bar-total{background:#d9cdb6;border-radius:4px 4px 0 0;align-items:flex-end;width:100%;min-height:2px;display:flex}.bar-correct{background:var(--correct);border-radius:4px 4px 0 0;width:100%}.bar-label{color:var(--muted);font-size:.65rem}.hbar-track{background:#efe6d6;border-radius:999px;height:12px;overflow:hidden}.hbar-fill{background:var(--correct);border-radius:999px;height:100%}.hbar-fill.accent{background:var(--accent)}.group-card{border:1px solid var(--line);background:#fdfaf4;border-radius:14px;margin-top:12px;padding:14px}.group-name{color:var(--ink);border:none;border-bottom:2px dashed var(--line);background:0 0;font-size:1.1rem;font-weight:800}.group-sub{margin:12px 0 6px;font-size:.85rem}.chip.toggle{cursor:pointer;border:1px solid var(--line);background:var(--surface)}.chip.toggle.on{background:var(--correct-bg);color:var(--correct);border-color:var(--correct)}.offline-banner{color:#fff8ee;text-align:center;background:#2b2620;border-radius:12px;margin:8px 0 4px;padding:10px 14px;font-size:.9rem;font-weight:700}.lesson-grid.stacks{align-items:start}.stack-cell,.stack-wrap{position:relative}.stack-wrap.has-followups:before,.stack-wrap.deep:after{content:"";border-radius:var(--radius);background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);z-index:0;position:absolute;inset:0}.stack-wrap.has-followups:before{transform:translate(7px,7px)}.stack-wrap.deep:after{transform:translate(14px,14px)}.stack-wrap>.lesson-card{z-index:1;position:relative}.stack-cell:hover .stack-wrap.has-followups:before{transform:translate(10px,10px)rotate(1.5deg)}.stack-cell:hover .stack-wrap.deep:after{transform:translate(20px,20px)rotate(3deg)}.stack-wrap.has-followups:before,.stack-wrap.deep:after{transition:transform .15s}.stack-count{z-index:2;background:var(--brand);color:#fff;box-shadow:var(--shadow);border:none;border-radius:999px;padding:5px 11px;font-size:.78rem;font-weight:800;position:absolute;bottom:8px;right:8px}.stack-count:hover{filter:brightness(1.06)}.stack-children{border:1px dashed var(--line);border-radius:var(--radius);background:#fdfaf4;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:12px;margin-top:18px;padding:12px;display:grid}.track-steps{gap:6px;margin:0;padding:0;list-style:none;display:grid}.track-step-row{border:1px solid var(--line);background:var(--surface);color:inherit;border-radius:12px;align-items:center;gap:10px;padding:8px 10px;text-decoration:none;display:flex}a.track-step-row:hover{border-color:var(--brand)}.track-step.done .track-step-row{background:#fbfdf9}.track-step.locked .track-step-row{opacity:.62;cursor:default}.track-step-mark{width:26px;height:26px;color:var(--muted);background:#efe6d6;border-radius:50%;flex:none;place-items:center;font-size:.8rem;font-weight:800;display:grid}.track-step-mark.done{background:var(--correct-bg);color:var(--correct)}.track-step-mark.open{background:var(--brand);color:#fff}.track-step-title{flex:1;min-width:0;font-weight:700}.track-step-year{white-space:nowrap;font-size:.8rem}.lesson-card-importance{color:var(--accent);letter-spacing:1px;margin:2px 0 0;font-size:.9rem}.lesson-card-importance .dim{color:var(--line)}.mkt{max-width:1080px;margin:0 auto;padding:0 20px}.mkt-nav{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;padding:18px 0;display:flex}.mkt-nav .brand{color:var(--ink);font-size:1.3rem;font-weight:800;text-decoration:none}.mkt-nav .brand span{color:var(--brand)}.mkt-nav-links{flex-wrap:wrap;align-items:center;gap:18px;display:flex}.mkt-nav-links a{color:var(--ink);opacity:.85;font-size:.95rem;font-weight:600;text-decoration:none}.mkt-nav-links a:hover{opacity:1}.mkt-hero{text-align:center;padding:48px 0 32px}.mkt-eyebrow{background:var(--correct-bg);color:var(--correct);border-radius:999px;margin-bottom:18px;padding:6px 14px;font-size:.82rem;font-weight:700;display:inline-block}.mkt-hero h1{letter-spacing:-.02em;margin:0 0 16px;font-size:clamp(2rem,5vw,3.4rem);line-height:1.08}.mkt-hero p.lead{color:var(--muted);max-width:680px;margin:0 auto 26px;font-size:clamp(1.05rem,2.2vw,1.3rem);line-height:1.5}.mkt-cta-row{flex-wrap:wrap;justify-content:center;gap:12px;display:flex}.mkt-fineprint{color:var(--muted);margin-top:14px;font-size:.85rem}.mkt-section{border-top:1px solid var(--line);padding:44px 0}.mkt-section h2{text-align:center;margin:0 0 8px;font-size:clamp(1.5rem,3vw,2.1rem)}.mkt-section .sub{text-align:center;color:var(--muted);max-width:640px;margin:0 auto 32px}.mkt-grid{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px;display:grid}.mkt-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}.mkt-card .ico{font-size:1.8rem}.mkt-card h3{margin:10px 0 6px;font-size:1.15rem}.mkt-card p{color:var(--muted);margin:0;line-height:1.5}.mkt-steps{counter-reset:step}.mkt-step{align-items:flex-start;gap:16px;padding:14px 0;display:flex}.mkt-step .n{background:var(--brand);color:#fff;border-radius:50%;flex:none;place-items:center;width:38px;height:38px;font-weight:800;display:grid}.mkt-step h3{margin:4px 0}.mkt-step p{color:var(--muted);margin:0}.mkt-proof{color:#fff;text-align:center;background:linear-gradient(135deg,#122a66,#2f6fed);border-radius:24px;margin:8px 0;padding:40px}.mkt-proof .medal{font-size:2.4rem}.mkt-proof blockquote{max-width:760px;margin:12px auto 14px;font-size:clamp(1.25rem,2.6vw,1.7rem);font-weight:600;line-height:1.4}.mkt-proof .src{opacity:.85;font-size:.95rem}.mkt-final{text-align:center;padding:56px 0}.mkt-final h2{margin:0 0 10px;font-size:clamp(1.6rem,3.4vw,2.3rem)}.mkt-final p{color:var(--muted);margin:0 0 22px}.mkt-footer{border-top:1px solid var(--line);color:var(--muted);padding:28px 0 44px;font-size:.9rem}.mkt-footer a{color:var(--muted);margin-right:16px;text-decoration:none}.mkt-footer a:hover{color:var(--ink)}.mkt-usecases{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;display:grid}.mkt-usecases a{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);color:var(--ink);box-shadow:var(--shadow);padding:20px;text-decoration:none;transition:transform 80ms;display:block}.mkt-usecases a:hover{transform:translateY(-2px)}.mkt-usecases .ico{font-size:1.6rem}.mkt-usecases h3{margin:8px 0 4px;font-size:1.1rem}.mkt-usecases p{color:var(--muted);margin:0;font-size:.92rem}.mkt-usecases .more{color:var(--brand);font-size:.9rem;font-weight:700}.lesson-card-cover{position:relative}.lesson-badge{-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);border-radius:999px;padding:3px 9px;font-size:.72rem;font-weight:800;position:absolute;top:8px}.lesson-badge.free{background:var(--correct-bg);color:var(--correct);right:8px}.lesson-badge.lock{color:#fff;background:#2b2620d1;right:8px}.lesson-badge.level{color:#fff;background:#2f6fedeb;left:8px}.lesson-card.locked{opacity:.82}.lesson-card.locked .lesson-card-cover img{filter:grayscale(.4)}.gate{text-align:center;max-width:520px;margin:32px auto}.gate .gate-ico{font-size:2.6rem}.mkt-feature{text-align:center;background:var(--surface);border:2px solid var(--brand);box-shadow:var(--shadow);border-radius:24px;padding:36px 28px}.mkt-card .more{color:var(--brand);margin-top:12px;font-size:.9rem;font-weight:800;text-decoration:none;display:inline-block}.mkt-card .more:hover{text-decoration:underline}.forgetting-curve{background:var(--surface);border:1px solid var(--line);border-radius:16px;width:100%;max-width:680px;margin:8px auto 0;padding:8px;display:block}.modal-overlay{z-index:50;background:#14100a8c;justify-content:center;align-items:center;padding:20px;display:flex;position:fixed;inset:0}.modal-card{background:var(--surface);border-radius:var(--radius);width:100%;max-width:440px;padding:24px;box-shadow:0 20px 60px #0000004d}.install-steps{gap:12px;margin:0;padding-left:1.3em;display:grid}.install-steps li{font-size:1.05rem;line-height:1.45}:focus-visible{outline:3px solid var(--brand);outline-offset:2px;border-radius:6px}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.001ms!important;animation-duration:.001ms!important;animation-iteration-count:1!important}.lesson-card:hover,.lesson-grid .lesson-card:hover,.lesson-grid .lesson-card.active,.lesson-grid .lesson-card:focus-visible,.lesson-tile:hover,.mkt-usecases a:hover{transform:none!important}}