:root{color-scheme:light;--paper:#f5f3ed;--white:#fffef9;--ink:#242c28;--muted:#626a63;--green:#254d3e;--line:#d7dace;--rust:#a4502c}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN",Meiryo,sans-serif;line-height:1.7}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer;border:1px solid var(--line);background:transparent;border-radius:6px;padding:10px 15px;color:var(--ink);font-size:14px}button:hover{background:#e6eade}button:disabled{opacity:.5;cursor:default}a{color:inherit;text-underline-offset:4px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #b26434;outline-offset:3px}.primary{background:var(--green);color:#fff;border-color:var(--green)}.primary:hover{background:#16392b}.shell{max-width:1200px;margin:auto;padding:0 36px}header{display:flex;justify-content:space-between;align-items:center;gap:20px;border-bottom:1px solid var(--line);padding:26px 0}.brand{font-weight:800;letter-spacing:-1px;font-size:25px;text-decoration:none}.brand span{color:var(--rust);margin-left:5px}nav{display:flex;gap:8px}nav button{border-color:transparent}.intro{padding:48px 0 36px;display:flex;align-items:flex-end;justify-content:space-between;gap:24px}.eyebrow{font-size:11px;color:var(--green);font-weight:750;letter-spacing:.13em;margin:0 0 14px}h1{font-size:clamp(24px,3vw,36px);letter-spacing:.01em;margin:0;font-weight:650;line-height:1.5}.intro>p{font-size:13px;color:var(--muted);margin:0 0 4px;line-height:1.9}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 245px;gap:28px}.practice-card{background:var(--white);border:1px solid var(--line);border-radius:12px;padding:28px;min-width:0}.lesson-top{display:flex;justify-content:space-between;align-items:center}.lesson-top .eyebrow{margin:0}.lesson-top>span:last-child{font-size:12px;color:var(--muted)}h2{font-size:21px;line-height:1.5;margin:15px 0 6px}.muted{color:var(--muted);font-size:13px}.progress-track{height:4px;background:#e9ece2;margin:24px 0;border-radius:4px;overflow:hidden}#progress-bar{height:100%;width:0;background:var(--green);transition:width .15s}#passage{max-height:340px;overflow-y:auto;scrollbar-width:thin;padding:4px 8px 12px 0;scroll-margin:20px}.chunk{border-left:2px solid transparent;padding:12px 16px;margin:0 0 8px}.chunk.active{border-color:var(--green);background:#f0f3ea}.chunk.done{border-color:#c9d6c6}.english{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:22px;line-height:1.9;overflow-wrap:anywhere;letter-spacing:.01em}.word{font:inherit;line-height:inherit;color:inherit;border:0;border-radius:0;padding:0;background:none;text-align:left}.word:hover{background:#e4e9d9}.char{color:#72796f}.char.correct{color:#27573f}.char.current{color:var(--ink);background:#dce5ce;border-bottom:2px solid var(--green)}.translation{font-size:13px;color:var(--muted);margin:6px 0 0;line-height:1.9;min-height:25px}.translation.concealed{visibility:hidden}.input-area{border-top:1px solid var(--line);padding-top:20px;margin-top:15px}label{display:block;font-size:13px;font-weight:600;margin-bottom:8px}label span{display:block;color:var(--muted);font-weight:400;font-size:11px}input[type=text],input[type=search],select{border:1px solid #b8c2b2;background:#fff;width:100%;padding:13px 14px;border-radius:6px;color:var(--ink);font-size:16px}#input-help{font-size:11px;color:var(--muted);margin:10px 0 4px}#input-status{font-size:12px;color:var(--green);min-height:22px;margin:4px 0 0}#input-status.error{color:#a12d22}.practice-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px}.practice-actions button{font-size:12px}.metrics{border-top:3px solid var(--green);padding:20px 0}.metric{display:flex;align-items:center;justify-content:space-between;padding:14px 0;border-bottom:1px solid var(--line)}.metric>span{font-size:12px}.metric strong{font-size:32px;line-height:1.3;font-weight:550;font-variant-numeric:tabular-nums}.metric small{font-size:11px;font-weight:400;padding-left:4px}.metric-note,.howto p:not(.eyebrow){font-size:11px;color:var(--muted);line-height:1.9}.howto{margin-top:12px}.howto ol{padding-left:18px;font-size:12px;line-height:2.5}.result{padding:22px;background:#edf2e5;border-radius:8px;margin-top:20px}.result h3{font-size:23px;margin:0}.result p:not(.eyebrow){font-size:14px}.result .eyebrow{margin-bottom:8px}footer{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;border-top:1px solid var(--line);margin-top:50px;padding:24px 0 36px;font-size:11px;color:var(--muted)}footer> a{font-weight:800;font-size:16px;text-decoration:none}footer div{display:flex;gap:20px}dialog{border:1px solid var(--line);border-radius:12px;background:var(--white);color:var(--ink);padding:26px;width:min(720px,calc(100% - 32px));max-height:85vh;max-height:85dvh;overflow:auto}dialog::backdrop{background:#15291dcc;backdrop-filter:blur(4px)}.dialog-head{display:flex;align-items:center;justify-content:space-between;gap:16px}.dialog-head h2{margin:0}.dialog-head button{font-size:22px;padding:0 12px}.filters{display:flex;gap:6px;flex-wrap:wrap;margin:18px 0}.filters button{padding:6px 11px;font-size:12px}.filters button[aria-pressed=true]{background:var(--green);color:#fff}.lesson-list{display:grid;gap:10px}.lesson-choice{width:100%;text-align:left;padding:15px;display:flex;align-items:center;justify-content:space-between;gap:20px}.lesson-choice strong{display:block;font-size:14px}.lesson-choice small{display:block;font-size:11px;color:var(--muted);margin-top:6px}.lesson-choice>span:last-child{white-space:nowrap;color:var(--green)}#settings-form{display:grid;gap:12px;margin-top:24px}#settings-form label{margin:0}.check{display:flex;align-items:center;gap:10px;margin-top:12px!important}.history-row{padding:14px 0;border-bottom:1px solid var(--line);font-size:13px}.history-row strong{display:block}.history-row small{color:var(--muted)}.danger{color:#a12d22}.sr-only,.skip:not(:focus){position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}.mobile-break{display:none}[hidden]{display:none!important}#storage-status{color:#a12d22}.skip:focus{position:fixed;z-index:20;background:white;padding:15px;top:10px;left:10px}@media(max-width:850px){.intro{display:block}.intro>p{margin-top:18px}.workspace{grid-template-columns:minmax(0,1fr)}aside{display:grid;grid-template-columns:1fr 1fr;gap:26px}.metrics{margin-top:0}.howto{padding-top:20px}}@media(max-width:520px){.shell{padding:0 18px}header{align-items:flex-start;padding:20px 0;gap:8px}.brand{font-size:21px}nav{gap:0;flex-wrap:wrap;justify-content:flex-end}nav button{padding:5px 7px;font-size:11px}.intro{padding:30px 0 26px}h1{font-size:26px}.mobile-break{display:block}.practice-card{padding:19px 16px}.english{font-size:19px}.chunk{padding:10px 10px}h2{font-size:18px}.lesson-top .eyebrow{font-size:10px}aside{display:block}.metrics{margin-top:12px}.metric{padding:10px 0}.metric strong{font-size:27px}.howto{padding:0}footer{margin-top:28px}dialog{padding:20px}.lesson-choice{gap:12px}#passage{max-height:280px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}