:root{font-family:"Yu Gothic","Meiryo",system-ui,sans-serif;color:#173349;background:#f3f8fa}*{box-sizing:border-box}body{margin:0}.shell{max-width:1240px;margin:auto;padding:24px 30px 40px}.topbar{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:24px}.brand{display:flex;align-items:center;gap:14px}.brand-mark{display:grid;place-items:center;width:48px;height:48px;border-radius:14px;background:#067c8c;color:white;font-size:29px;font-weight:800}.brand strong{display:block;font-size:20px}.brand small{display:block;color:#617783;margin-top:3px}.top-actions{display:flex;gap:10px}.quiet{background:white;border:1px solid #c6d8df;color:#27536b;border-radius:9px;padding:10px 13px;font-weight:700;cursor:pointer}.quiet:hover{background:#eaf4f6}.levels{display:grid;grid-template-columns:repeat(6,1fr);gap:9px}.levels button{min-height:68px;border:1px solid #d1e0e5;background:#fff;border-radius:12px;color:#56717d;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:8px;padding:8px}.levels b{font-size:20px}.levels span{font-size:12px;font-weight:700}.levels button.active{background:#087d8d;border-color:#087d8d;color:#fff;box-shadow:0 6px 16px #087d8d30}.levels button:focus-visible,.quiet:focus-visible{outline:3px solid #efae47;outline-offset:2px}main{max-width:1000px;margin:32px auto 0}.mode-selector{display:flex;align-items:center;justify-content:center;gap:10px;margin-bottom:20px;color:#3a6172;font-weight:800}.mode-selector button{border:1px solid #b8d2da;background:white;color:#2f6573;border-radius:9px;padding:8px 18px;font:inherit;cursor:pointer}.mode-selector button.active{background:#087d8d;border-color:#087d8d;color:white}.mode-selector button:focus-visible{outline:3px solid #efae47;outline-offset:2px}.mode-selector[hidden]{display:none}.status{display:flex;justify-content:space-between;font-weight:800;color:#3a6172;margin-bottom:11px}.progress-track{height:9px;border-radius:10px;background:#dce9ed;overflow:hidden}.progress-track>div{height:100%;width:0;background:#14a28f;transition:width .25s}.card{position:relative;background:white;border:1px solid #d9e7eb;border-radius:22px;min-height:330px;margin-top:18px;padding:32px;text-align:center;box-shadow:0 12px 28px #0c485b0e}.eyebrow{color:#577d8c;font-weight:800;letter-spacing:.08em;font-size:14px}.question{font-size:clamp(40px,5vw,67px);font-weight:800;line-height:1.4;margin:16px 0 8px;overflow-wrap:anywhere}.question .done{color:#80a9ad}.question .current{color:#087d8d;text-decoration:underline;text-decoration-thickness:4px;text-underline-offset:10px}.reading{min-height:25px;color:#6c8790;font-size:18px}.entry{min-height:66px;display:flex;align-items:center;justify-content:center;gap:4px;flex-wrap:wrap;font-size:31px;font-weight:700}.entry .committed{color:#416976}.entry .composing{text-decoration:underline;text-decoration-thickness:3px;text-decoration-color:#0c8e9c;text-underline-offset:6px;color:#087d8d}.entry .cursor{display:inline-block;width:2px;height:32px;background:#13a18d;animation:blink 1s step-end infinite}.roman{min-height:31px;color:#6b8b95;letter-spacing:.12em;font-size:20px;font-weight:700}.roman .typed{color:#0b8f82}.roman .next{background:#fff0c8;color:#845310;border-radius:5px;padding:0 3px}.instruction{margin-top:12px;min-height:32px;color:#2f6573;font-size:16px;font-weight:700}.candidate{position:absolute;z-index:2;left:50%;transform:translateX(-50%);top:69%;min-width:240px;max-width:90%;background:white;border:2px solid #0c8e9c;border-radius:11px;box-shadow:0 12px 32px #1733492e;text-align:left;padding:6px}.candidate button{display:block;width:100%;text-align:left;border:0;background:white;border-radius:6px;padding:8px 12px;font-size:21px;cursor:pointer}.candidate button.selected{background:#e3f5f2;color:#096d73;font-weight:800}.message{text-align:center;color:#567783;min-height:25px;font-weight:700}.help{text-align:center;color:#74909a;font-size:13px;margin-top:20px}.help span{margin-left:12px}.shake{animation:shake .25s linear;border-color:#e46262!important}.error{color:#ca4141!important}@keyframes shake{25%{transform:translateX(-5px)}50%{transform:translateX(5px)}75%{transform:translateX(-3px)}}@keyframes blink{50%{opacity:0}}@media(max-width:900px){.levels{grid-template-columns:repeat(3,1fr)}.shell{padding:16px}.card{padding:24px;min-height:300px}}@media(max-width:650px){.topbar{align-items:flex-start;flex-direction:column}.levels{grid-template-columns:repeat(2,1fr)}.levels button{min-height:55px}.question{font-size:38px}}
.activity-tabs{display:flex;gap:10px;margin:10px 0 20px}.activity-tabs button,.mouse-modes button{border:1px solid #b8d2da;background:#fff;color:#2f6573;border-radius:11px;padding:13px 20px;font:inherit;font-weight:800;cursor:pointer}.activity-tabs button.active,.mouse-modes button.active{background:#087d8d;border-color:#087d8d;color:white}.activity-tabs button:focus-visible,.mouse-modes button:focus-visible,.mouse-target:focus-visible,.mouse-menu button:focus-visible,.mouse-restart:focus-visible{outline:3px solid #efae47;outline-offset:2px}[hidden]{display:none!important}.mouse-activity h1{text-align:center;font-size:30px;margin:0 0 8px}.mouse-intro{text-align:center;color:#567783;font-weight:700;line-height:1.7}.mouse-modes{display:flex;justify-content:center;flex-wrap:wrap;gap:10px;margin:24px 0}.mouse-card{padding:22px}.mouse-arena{position:relative;margin-top:16px;min-height:370px;border:2px dashed #b8d2da;border-radius:16px;background:#f8fcfd;overflow:hidden;user-select:none}.mouse-target{position:absolute;display:grid;place-items:center;transform:translate(-50%,-50%);border:3px solid #087d8d;border-radius:50%;background:#ccefed;color:#135667;font-size:16px;font-weight:800;cursor:pointer;line-height:1.2;text-align:center;padding:8px}.mouse-target:hover{background:#a7e3de}.mouse-target.success{background:#c5f2d9;border-color:#198354}.mouse-menu{position:absolute;z-index:3;width:180px;background:white;border:2px solid #087d8d;border-radius:10px;box-shadow:0 10px 22px #17334933;padding:5px;text-align:left}.mouse-menu button{display:block;width:100%;padding:9px 12px;border:0;border-radius:5px;background:white;color:#173349;text-align:left;font:inherit;cursor:pointer}.mouse-menu button:hover{background:#e3f5f2}.mouse-restart{display:block;margin:14px auto 0}.mouse-activity .message{font-size:18px;min-height:30px}@media(max-width:650px){.activity-tabs{flex-wrap:wrap}.mouse-arena{min-height:320px}.mouse-modes button{padding:10px}}

/* 練習メニューを左側にまとめる */
:root{font-family:"Noto Sans JP","Yu Gothic","Meiryo",system-ui,sans-serif}
button,input{font-family:inherit}
.practice-layout{display:grid;grid-template-columns:255px minmax(0,1fr);gap:28px;align-items:start}
.practice-sidebar{background:#eaf3f5;border:1px solid #d5e5e9;border-radius:18px;padding:14px;position:sticky;top:18px}
.practice-content{min-width:0}
.practice-content main{max-width:none;margin:0 auto}
.activity-tabs{display:flex;flex-direction:column;gap:8px;margin:0 0 16px}
.activity-tabs button{width:100%;text-align:left;padding:14px 12px;font-size:15px}
.levels{display:flex;flex-direction:column;gap:6px;border-top:1px solid #c9dce2;padding-top:14px}
.levels button{width:100%;min-height:52px;justify-content:flex-start;text-align:left;padding:9px 12px;gap:12px}
.levels b{display:grid;place-items:center;flex:none;width:28px;height:28px;border-radius:8px;background:#e7f1f3;font-size:16px}
.levels span{font-size:14px;line-height:1.4}
.levels button.active b{background:#ffffff30}
.practice-sidebar.mouse-selected .levels button.active{background:#fff;border-color:#d1e0e5;color:#56717d;box-shadow:none}
.practice-sidebar.mouse-selected .levels button.active b{background:#e7f1f3}
@media(max-width:900px){.practice-layout{grid-template-columns:215px minmax(0,1fr);gap:18px}.levels{display:flex}.levels button{min-height:52px}.levels span{font-size:13px}}
@media(max-width:650px){.practice-layout{display:block}.practice-sidebar{position:static;margin-bottom:18px}.activity-tabs{flex-direction:row}.activity-tabs button{text-align:center}.levels{display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}.levels button{min-height:52px}.practice-content main{margin-top:0}}
.row-selector{margin:0 0 22px;padding:18px 20px;background:#eaf3f5;border:1px solid #d5e5e9;border-radius:16px}
.row-selector-label{display:block;margin-bottom:10px;color:#31596a;font-size:14px;font-weight:800}
.row-buttons{display:flex;flex-wrap:wrap;gap:7px}
.row-buttons button{min-width:64px;padding:7px 10px;border:1px solid #b8d2da;border-radius:9px;background:#fff;color:#2f6573;font-size:14px;font-weight:700;cursor:pointer}
.row-buttons button:hover{background:#dceef1}
.row-buttons button.active{background:#087d8d;border-color:#087d8d;color:#fff}
.row-buttons button:focus-visible{outline:3px solid #efae47;outline-offset:2px}
.practice-sidebar .mode-selector{display:block;margin:16px 0 0;padding-top:14px;border-top:1px solid #c9dce2;color:#31596a;font-size:14px}
.practice-sidebar .mode-selector[hidden],.practice-sidebar.mouse-selected .mode-selector{display:none}
.practice-sidebar .mode-selector>span{display:block;margin-bottom:9px}
.practice-sidebar .mode-buttons{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px}
.practice-sidebar .mode-selector button{width:100%;padding:9px 5px;font-size:13px;white-space:nowrap}
.success-banner{display:inline-flex;align-items:center;justify-content:center;gap:12px;flex-wrap:wrap;margin:8px auto 12px;padding:10px 20px;border:1px solid #8bdbb3;border-radius:12px;background:#e0f7e9;color:#176b42;font-size:22px;font-weight:800}
.success-banner small{font-size:13px;font-weight:700}
.mouse-card .success-banner{margin-top:16px;margin-bottom:0}
/* 短文は一行のまま表示し、狭い画面では横に追えるようにする。 */
.question.single-line{white-space:nowrap;overflow-wrap:normal;overflow-x:auto;overflow-y:hidden;max-width:100%;scrollbar-width:thin;line-height:1.55}
.question.single-line span{white-space:nowrap}

/* 画面・問題の切替だけを動かし、入力中の表示は静止させる。 */
.levels button,.activity-tabs button,.mode-selector button,.row-buttons button,.mouse-modes button{transition:background-color .2s ease,border-color .2s ease,color .2s ease,box-shadow .2s ease}
.view-enter{animation:view-enter .34s cubic-bezier(.2,.7,.2,1) both}
.success-banner:not([hidden]){animation:success-enter .34s cubic-bezier(.2,.8,.2,1) both}
.candidate:not([hidden]){animation:popup-enter .18s ease-out both}
.mouse-menu:not([hidden]){animation:menu-enter .18s ease-out both}
.mouse-target{transition:left .36s ease,top .36s ease,width .36s ease,height .36s ease,background-color .2s ease,border-color .2s ease}
@keyframes view-enter{from{opacity:.35;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}
@keyframes success-enter{from{opacity:0;transform:translateY(7px) scale(.97)}to{opacity:1;transform:translateY(0) scale(1)}}
@keyframes popup-enter{from{opacity:0;transform:translate(-50%,5px)}to{opacity:1;transform:translate(-50%,0)}}
@keyframes menu-enter{from{opacity:0;transform:translateY(5px)}to{opacity:1;transform:translateY(0)}}
@media(prefers-reduced-motion:reduce){.view-enter,.success-banner:not([hidden]),.candidate:not([hidden]),.mouse-menu:not([hidden]),.entry .cursor,.shake{animation:none}.levels button,.activity-tabs button,.mode-selector button,.row-buttons button,.mouse-modes button,.mouse-target,.progress-track>div{transition:none}}