:root{--bg:#f4f6f3;--surface:#fff;--sunk:#e9ede8;--fg:#17212b;--muted:#59645f;--line:#d5dbd5;--accent:#1d6a51;--accent-ink:#fff;--accent-soft:#dcebe4;--mark:#ffe68f;--ok:#1f7a45;--ok-soft:#dff1e5;--warn:#b07510;--bad:#b4372f;--bad-soft:#f8e1de;--new:#2c4e94;--new-soft:#e1e8f6;--f-display:"Newsreader",Georgia,"Times New Roman",serif;--f-body:"Atkinson Hyperlegible",system-ui,-apple-system,"Segoe UI",sans-serif;--f-mono:"IBM Plex Mono",ui-monospace,Menlo,Consolas,monospace;--read:1.08rem}@media (prefers-color-scheme:dark){:root{--bg:#11171c;--surface:#182027;--sunk:#0d1216;--fg:#e4e9e6;--muted:#9aa7a1;--line:#2b353d;--accent:#6cc4a1;--accent-ink:#0d1a14;--accent-soft:#1c3a30;--mark:#5a4a12;--ok:#7bd39c;--ok-soft:#173326;--warn:#e3b04f;--bad:#f08a80;--bad-soft:#3d1f1c;--new:#9db8f0;--new-soft:#1d2a45;color-scheme:dark}}*{box-sizing:border-box}body,html{background:var(--bg);color:var(--fg)}body{margin:0;font-family:var(--f-body);font-size:16px;line-height:1.6}a{color:var(--accent)}:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:4px}h1,h2,h3{font-family:var(--f-display);font-weight:650;line-height:1.15;letter-spacing:-.01em;text-wrap:balance}h1{font-size:clamp(1.9rem,4.5vw,2.8rem);margin:0 0 .4em}h2{font-size:1.55rem;margin:1.8em 0 .5em}h3{font-size:1.2rem;margin:1.2em 0 .4em}.wrap{max-width:1080px}.narrow,.wrap{margin:0 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10px;border-radius:8px;font-size:.95rem;background:none;border:0;cursor:pointer;font:inherit}.nav a:hover,.nav button:hover{background:var(--sunk)}.nav a.cta{background:var(--accent);color:var(--accent-ink);font-weight:700}.foot{border-top:1px solid var(--line);padding-block:28px 40px;color:var(--muted);font-size:.86rem}.foot .wrap{display:grid;grid-gap:8px;gap:8px}.foot a{color:var(--muted)}.btn{display:inline-flex;align-items:center;gap:8px;border:0;border-radius:10px;padding:11px 18px;background:var(--accent);color:var(--accent-ink);font:inherit;font-weight:700;cursor:pointer;text-decoration:none}.btn:disabled{opacity:.6;cursor:default}.btn.ghost{background:transparent;color:var(--fg);border:1px solid var(--line);font-weight:400}.btn.ghost:hover{background:var(--sunk)}.row{display:flex;flex-wrap:wrap;gap:10px;align-items:center}.form{display:grid;grid-gap:10px;gap:10px;margin:16px 0}.form input[type=email],.form input[type=password],select{font:inherit;color:inherit;padding:10px 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li{padding-left:26px;position:relative}.ticks li:before{content:"";position:absolute;left:4px;top:.5em;width:12px;height:7px;border-left:2px solid var(--ok);border-bottom:2px solid var(--ok);transform:rotate(-45deg)}.appnav a.on{background:var(--accent-soft);font-weight:700}.wm{position:fixed;inset:0;pointer-events:none;z-index:1;opacity:.05}.noselect{-webkit-user-select:none;-moz-user-select:none;user-select:none}.tiles{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));grid-gap:12px;gap:12px;margin:16px 0}.chlist{display:grid;grid-gap:8px;gap:8px;margin:12px 0;padding:0;list-style:none}.chlist li{display:grid;grid-template-columns:34px 1fr auto;grid-gap:10px;gap:10px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:10px 12px}.chlist .n{font-family:var(--f-mono);color:var(--muted);font-size:.85rem}.chlist .acts{display:flex;gap:6px;flex-wrap:wrap;justify-content:flex-end}.chlist .acts a{font-size:.88rem}.pill{font-family:var(--f-mono);font-size:.72rem;border-radius:999px;padding:2px 8px;background:var(--sunk);color:var(--muted);white-space:nowrap}.pill.ok{background:var(--ok-soft);color:var(--ok)}.pill.free{background:var(--new-soft);color:var(--new)}.bar{height:6px;background:var(--sunk);border-radius:6px;overflow:hidden}.bar i{display:block;height:100%;background:var(--accent)}.reader h2{scroll-margin-top:80px}.reader li,.reader p,.reader td{font-size:var(--read)}.reader ol,.reader ul{padding-left:1.3em;display:grid;grid-gap:.45em;gap:.45em}.reader .lede{font-size:calc(var(--read)*1.08);border-left:3px solid var(--accent);padding-left:14px}.reader .ex,.reader aside{border-radius:10px;padding:14px 16px;margin:0 0 1.2em}.reader .ex b:first-child,.reader aside b:first-child{display:block;font-family:var(--f-mono);font-size:.72rem;letter-spacing:.09em;text-transform:uppercase;margin-bottom:4px;font-weight:500}.reader aside.tip{background:var(--accent-soft)}.reader aside.tip b:first-child{color:var(--accent)}.reader aside.mem{background:var(--sunk);border:1px dashed var(--line)}.reader aside.new{background:var(--new-soft)}.reader aside.new b:first-child{color:var(--new)}.reader .ex{font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.reader .ex,.reader .tbl{background:var(--surface);border:1px solid var(--line)}.reader .tbl{overflow-x:auto;border-radius:10px;margin:0 0 1.2em}.reader table{border-collapse:collapse;width:100%;min-width:480px}.reader th{text-align:left;font-family:var(--f-mono);font-size:.76rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);background:var(--sunk);padding:9px 12px;font-weight:500}.reader td{padding:9px 12px;border-top:1px solid var(--line);vertical-align:top}.reader td:first-child{font-weight:700}.reader dl{display:grid;grid-template-columns:minmax(0,12em) 1fr;grid-gap:8px 16px;gap:8px 16px}.reader dt{font-weight:700}.reader dd{margin:0}@media (max-width:560px){.reader dl{grid-template-columns:1fr}}.speaking{background:var(--mark)!important;box-shadow:0 0 0 4px var(--mark);border-radius:6px}body.listening .reader li,body.listening .reader p{cursor:pointer}.player{position:fixed;left:0;right:0;bottom:0;z-index:25;background:var(--surface);border-top:1px solid var(--line);padding:10px max(16px,env(safe-area-inset-right,0px)) calc(10px + env(safe-area-inset-bottom,0px)) max(16px,env(safe-area-inset-left,0px));display:flex;flex-wrap:wrap;gap:10px 14px;align-items:center}.player .now{flex:1 1 200px;min-width:0;font-size:.85rem;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.pbtn{width:42px;height:42px;border-radius:50%;border:1px solid var(--line);background:var(--surface);color:var(--fg);cursor:pointer;font-size:1rem}.pbtn.main{background:var(--accent);color:var(--accent-ink);border-color:var(--accent);width:48px;height:48px}.speed{display:flex;gap:8px;align-items:center;font-size:.85rem}.speed input{accent-color:var(--accent);width:110px}.qcard{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:18px;margin:12px 0}.qmeta{font-family:var(--f-mono);font-size:.74rem;color:var(--muted);letter-spacing:.06em;display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap}.qtext{font-weight:700;font-size:1.06rem;margin:6px 0 14px}.opts{grid-gap:8px}.opt,.opts{display:grid;gap:8px}.opt{text-align:left;border:1px solid var(--line);background:var(--bg);color:var(--fg);border-radius:10px;padding:11px 12px;cursor:pointer;grid-template-columns:26px 1fr;grid-gap:8px;font:inherit;line-height:1.45}.opt:hover:not(:disabled){border-color:var(--accent)}.opt .k{font-family:var(--f-mono);font-size:.8rem;width:22px;height:22px;border-radius:50%;border:1px solid var(--line);display:grid;place-items:center}.opt.sel{border-color:var(--accent);background:var(--accent-soft)}.opt.right{border-color:var(--ok);background:var(--ok-soft)}.opt.wrong{border-color:var(--bad);background:var(--bad-soft)}.opt:disabled{cursor:default}.why{margin-top:12px;padding:12px 14px;border-radius:10px;background:var(--sunk)}.why strong{display:block}.filters{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));grid-gap:10px;gap:10px;margin:12px 0}.filters label{font-size:.85rem;color:var(--muted);display:grid;grid-gap:4px;gap:4px}.qgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(34px,1fr));grid-gap:4px;gap:4px;margin:12px 0}.qgrid button{font:inherit;font-size:.78rem;font-family:var(--f-mono);border:1px solid var(--line);background:var(--surface);color:var(--fg);border-radius:6px;padding:4px 0;cursor:pointer}.qgrid button.done{background:var(--accent-soft);border-color:var(--accent)}.qgrid button.cur{outline:2px solid var(--accent)}.timer{font-family:var(--f-mono);font-feature-settings:"tnum";font-variant-numeric:tabular-nums;font-size:1.1rem}@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}.chtiles{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));grid-gap:12px;gap:12px;margin:12px 0 24px}.chtile{background:var(--surface);border-radius:12px;padding:14px;display:flex;flex-direction:column;gap:8px;border:1px solid var(--line);border-top:4px solid var(--line)}.chtile.ok{border-top-color:var(--ok)}.chtile.mid{border-top-color:var(--warn)}.chtile.low{border-top-color:var(--bad)}.chtile .n{font-family:var(--f-mono);font-size:.72rem;color:var(--muted);letter-spacing:.08em}.chtile .t{font-family:var(--f-display);font-size:1.08rem;line-height:1.25}.chtile .quiz{display:grid;grid-template-columns:auto 1fr;grid-gap:4px 10px;gap:4px 10px;align-items:center;margin-top:auto}.chtile .qp{font-family:var(--f-display);font-size:1.6rem;font-weight:650;font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.chtile.ok .qp{color:var(--ok)}.chtile.mid .qp{color:var(--warn)}.chtile.low .qp{color:var(--bad)}.chtile.ok .bar i{background:var(--ok)}.chtile.mid .bar i{background:var(--warn)}.chtile.low .bar i{background:var(--bad)}.chtile .acts{display:flex;gap:14px;font-size:.92rem}.sizes{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:12px 0}.sizes>.small{margin-right:4px}.chip{font:inherit;font-size:.9rem;padding:6px 14px;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:inherit;cursor:pointer}.chip.on,.chip:hover{border-color:var(--accent)}.chip.on{background:var(--accent);color:var(--accent-ink)}.chip.on .muted{color:inherit;opacity:.8}.hero-note{display:flex;gap:16px;align-items:center;padding:16px 18px;border-radius:12px;background:var(--accent-soft);margin:12px 0 8px}.hero-note>b{font-size:2.6rem;line-height:1;color:var(--accent)}.badge-new{display:inline-block;font-size:.7rem;font-weight:700;letter-spacing:.04em;padding:2px 7px;border-radius:999px;background:var(--accent);color:var(--accent-ink);vertical-align:middle;margin-left:6px}@media (max-width:480px){.hero-note>b{display:none}}.readagain{display:flex;flex-direction:column;gap:2px;margin-top:10px;padding:10px 14px;border-radius:10px;border:1px solid var(--accent);background:var(--accent-soft);color:inherit;text-decoration:none}.readagain .small{color:var(--accent);font-weight:700}.readagain b:after{content:" →";color:var(--accent)}.readagain:hover{background:var(--surface)}h2[id^=s]{scroll-margin-top:84px}h2[id^=s]:target{background:var(--mark);border-radius:6px;padding:2px 6px;margin-left:-6px}