:root{--primary:#1d4e89;--primary-light:#e3ecf6;--accent:#e8b04a;--accent-light:#fdf3dc;--accent-text:#9a6a00;--green:#0b6e4f;--green-light:#dff3ea;--green-new:#5bbf95;--red:#c2410c;--red-light:#fde8de;--text:#1f2933;--sub:#52606d;--muted:#7b8794;--line:#c9d6e3;--bg:#eef3f8;--paper:#fffdf6;--paper-edge:#e9ddbf;--white:#fff;--track:#e4e9ef;--shadow:0 6px 18px #1f29331a;--font:"Noto Sans JP", "Hiragino Sans", "Yu Gothic UI", sans-serif;--font-head:"Zen Maru Gothic", "Noto Sans JP", sans-serif}*{box-sizing:border-box}html,body{margin:0}body{font-family:var(--font);color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}button{font:inherit;color:inherit}h1,h2{margin:0}hr{border:0;border-top:1px solid var(--line);margin:24px 0}a{color:inherit;text-decoration:none}.page{min-height:100vh}.loading{color:var(--muted);place-items:center;display:grid}.container{max-width:1088px;margin:0 auto;padding:32px 16px 64px}.center-message{text-align:center;padding-top:120px}.title{font-family:var(--font-head);align-items:center;gap:16px;margin:8px 0;font-size:32px;font-weight:700;display:flex}.lead{color:var(--sub);word-break:auto-phrase;margin:0 0 24px;line-height:1.7}.muted{color:var(--muted)}.sub{color:var(--sub)}.small{font-size:13px}.strong{font-weight:700}.center{text-align:center}.ng-text{color:var(--red)}.row-between{justify-content:space-between;align-items:baseline;margin-bottom:10px;display:flex}.section-label{color:var(--muted);margin:0 0 10px;font-size:14px;font-weight:700}.link{color:var(--primary);cursor:pointer;background:0 0;border:0;margin-bottom:20px;padding:0;font-weight:500}.link:hover{text-decoration:underline}.header{background:var(--white);border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;height:64px;padding:0 32px;display:flex}.logo{font-family:var(--font-head);color:var(--primary);align-items:center;gap:12px;font-size:22px;font-weight:700;display:flex}.logo-mark{border:2px solid var(--primary);background:var(--paper);width:36px;height:28px;box-shadow:inset 8px 0 0 var(--accent);border-radius:4px}.btn{cursor:pointer;border:0;border-radius:999px;padding:12px 28px;font-weight:700;transition:transform 80ms,box-shadow .15s,background .15s}.btn:active{transform:translateY(1px)}.btn:focus-visible,.chip:focus-visible,.deck-card:focus-visible,.link:focus-visible{outline:3px solid var(--accent);outline-offset:2px}.btn-primary{background:var(--primary);color:var(--white);box-shadow:0 6px 16px #1d4e8940}.btn-primary:hover{background:#17406f}.btn-ghost{background:var(--white);border:1px solid var(--line)}.btn-ghost:hover{background:var(--bg)}.btn-outline{background:var(--white);border:2px solid var(--primary);color:var(--primary)}.btn-danger{background:var(--red);color:var(--white)}.btn-sm{color:var(--sub);padding:6px 18px;font-size:13px;font-weight:500}.btn-lg{padding:16px 32px;font-size:16px}.btn-xl{width:100%;padding:22px;font-size:24px}.kbd{border:1px solid var(--line);background:var(--white);min-width:56px;color:var(--primary);font:700 13px var(--font);text-align:center;border-radius:6px;margin-right:10px;padding:6px 10px;display:inline-block}.badge{white-space:nowrap;border-radius:999px;align-items:center;padding:6px 16px;font-size:14px;font-weight:700;display:inline-flex}.badge-ok{background:var(--green-light);color:var(--green)}.badge-ng{background:var(--red-light);color:var(--red)}.badge-warn{background:var(--accent-light);color:var(--accent-text)}.badge-muted{background:var(--track);color:var(--sub)}.badge-lg{margin:4px 0 12px;padding:8px 20px;font-size:16px}.title-badge{font-family:var(--font);font-size:14px}.paper{background:var(--paper);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:16px}.progress{background:var(--track);border-radius:5px;flex:1;height:10px;display:block;position:relative;overflow:hidden}.progress-fill,.progress-new{border-radius:5px;position:absolute;top:0;bottom:0;left:0}.progress-fill{background:var(--green)}.progress-new{background:var(--green-new);border-radius:0 5px 5px 0}.learned{color:var(--green);white-space:nowrap;font-size:14px;font-weight:700}.filters{flex-wrap:wrap;gap:56px;margin-bottom:32px;display:flex}.chips{gap:12px;display:flex}.chip{border:1px solid var(--line);background:var(--white);min-width:116px;height:48px;color:var(--muted);cursor:pointer;border-radius:24px;font-size:14px;font-weight:700}.chip small{font-size:12px}.chip-on{background:var(--primary);color:var(--white);border-color:var(--primary);font-size:18px}.chip:disabled{cursor:not-allowed}.deck-grid{grid-template-columns:repeat(auto-fill,minmax(420px,1fr));gap:24px;display:grid}.deck-card{cursor:pointer;flex-direction:column;gap:8px;padding:24px 32px 24px 44px;transition:transform .12s,border-color .12s,box-shadow .12s;display:flex;position:relative;overflow:hidden}.deck-card:before{content:"";background:var(--paper-edge);width:12px;transition:background .12s;position:absolute;top:0;bottom:0;left:0}.deck-card:hover{border-color:var(--primary);box-shadow:0 0 0 2px var(--primary), var(--shadow);transform:translateY(-2px)}.deck-card:hover:before{background:var(--accent)}.deck-tag{color:var(--primary);font-size:13px;font-weight:700}.deck-name{font-family:var(--font-head);font-size:22px;font-weight:700}.deck-desc{color:var(--sub);word-break:auto-phrase;font-size:14px;line-height:1.6}.deck-progress{align-items:center;gap:16px;margin-top:12px;font-size:13px;display:flex}.deck-progress .progress{height:8px}.start-grid{grid-template-columns:minmax(0,640px) minmax(0,408px);gap:40px;display:grid}.deck-info{padding:36px 48px;position:relative;overflow:hidden}.deck-info:before{content:"";background:var(--accent);width:14px;position:absolute;top:0;bottom:0;left:0}.deck-title{font-family:var(--font-head);margin:6px 0 12px;font-size:36px}.textbook{margin:-12px 0 24px}.stats{grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:28px;display:grid}.stat{background:var(--white);border:1px solid var(--line);border-radius:12px;padding:14px 18px}.stat-value{margin-top:4px;font-size:26px;font-weight:700}.setting{cursor:pointer;justify-content:space-between;align-items:center;gap:24px;margin-bottom:20px;display:flex}.setting>span{flex-direction:column;gap:4px;display:flex}.setting-label{font-weight:500}.toggle{appearance:none;background:var(--line);cursor:pointer;border-radius:14px;flex-shrink:0;width:48px;height:28px;margin:0;transition:background .15s;position:relative}.toggle:after{content:"";background:var(--white);border-radius:50%;width:22px;height:22px;transition:left .15s;position:absolute;top:3px;left:3px}.toggle:checked{background:var(--green)}.toggle:checked:after{left:23px}.toggle:focus-visible{outline:3px solid var(--accent);outline-offset:2px}.side{flex-direction:column;gap:24px;display:flex}.panel{background:var(--white);border:1px solid var(--line);border-radius:20px;padding:28px 32px}.howto h2{font-family:var(--font-head);margin-bottom:20px;font-size:20px}.howto ul{flex-direction:column;gap:16px;margin:0 0 20px;padding:0;font-size:14px;list-style:none;display:flex}.howto p{margin:0;line-height:1.7}.side .small.center{margin-top:-12px}.play{flex-direction:column;display:flex}.play-bar{background:var(--white);border-bottom:4px solid #dce3ea;align-items:center;gap:16px;height:64px;padding:0 24px;display:flex;position:relative}.play-deck{font-weight:700}.play-stats{gap:0;margin-left:auto;display:flex}.play-stat{width:128px}.play-stat-label{color:var(--muted);font-size:11px}.play-stat-value{font-variant-numeric:tabular-nums;font-size:20px;font-weight:700}.play-stat-value.accent{color:var(--red)}.play-progress{background:var(--accent);height:4px;transition:width .3s;position:absolute;bottom:-4px;left:0}.play-main{flex-direction:column;flex:1;align-items:center;padding:44px 16px 32px;display:flex}.card-stack{perspective:1600px;width:min(784px,100%);height:380px;position:relative}.card-stack:before,.card-stack:after{content:"";background:#f6eeda;border-radius:20px;position:absolute;inset:0;transform:translate(10px,10px)}.card-stack:after{z-index:-1;background:#efe6cf;transform:translate(20px,20px)}.card-stack:before{z-index:0}.card-flip{z-index:1;width:100%;height:100%;transform-style:preserve-3d;transition:transform .45s cubic-bezier(.3,.7,.4,1);position:relative}.card-flip.flipped{transform:rotateY(180deg)}.card-face{backface-visibility:hidden;border-radius:20px;flex-direction:column;padding:24px 48px 28px 64px;display:flex;position:absolute;inset:0;box-shadow:0 10px 28px #1f293324}.card-face:before{content:"";background:var(--bg);border:1px solid var(--line);border-radius:50%;width:20px;height:20px;position:absolute;top:24px;left:28px}.card-back{transform:rotateY(180deg)}.card-back.ok{border:3px solid var(--green)}.card-back.ng{border:3px solid var(--red)}.card-top{align-items:center;gap:12px;min-height:36px;display:flex}.card-no{color:var(--muted);margin-right:auto;font-size:14px;font-weight:700}.card-front-text{text-align:center;font-family:var(--font-head);text-wrap:balance;word-break:auto-phrase;flex:1;justify-content:center;align-items:center;margin:0;font-size:clamp(26px,3.4vw,40px);font-weight:700;line-height:1.5;display:flex}.hint{text-align:center;color:var(--muted);min-height:32px;margin:0;font-size:14px}.hint-on{color:var(--accent-text);letter-spacing:.05em;font-size:22px;font-weight:700}.answer-big{text-align:center;font-family:var(--font-head);margin:4px 0 20px;font-size:72px;font-weight:700;line-height:1}.answer-big rt{font-family:var(--font);color:var(--sub);ruby-align:center;letter-spacing:.1em;padding-bottom:6px;font-size:18px;font-weight:400}.compare{grid-template-columns:1fr 1px 1fr;gap:32px;padding:4px 0 20px;display:grid}.compare-divider{background:var(--line)}.compare-label{margin-bottom:4px;font-size:13px;font-weight:700}.compare-label.ok{color:var(--green)}.compare-label.ng{color:var(--red)}.compare-answer{font-family:var(--font-head);word-break:break-all;font-size:48px;font-weight:700;line-height:1.25}.compare-answer.wrong{color:var(--muted);text-decoration:line-through;text-decoration-thickness:3px}.card-detail{border-top:1px solid var(--line);flex-direction:column;gap:6px;padding-top:14px;display:flex}.detail-label{color:var(--muted);font-size:13px;font-weight:700}.example{margin:0 0 6px;font-size:18px;line-height:1.6}.example mark{color:var(--primary);background:0 0;font-weight:700}.note{background:var(--accent-light);border-radius:10px;padding:10px 16px;font-size:14px}.answer-area{flex-direction:column;align-items:center;gap:12px;width:min(600px,100%);min-height:152px;margin-top:48px;display:flex}.retype-label{color:var(--red);align-self:flex-start;margin-bottom:-4px;font-size:13px;font-weight:700}.answer-input{background:var(--white);border:3px solid var(--primary);border-radius:14px;align-items:center;width:100%;height:72px;padding:0 24px 0 28px;display:flex}.answer-input.retype{border-color:var(--red)}.answer-input input{min-width:0;font:500 30px var(--font);color:var(--text);background:0 0;border:0;outline:0;flex:1}.answer-input input::placeholder{color:#c9ced6}.input-hint{color:var(--muted);white-space:nowrap;font-size:14px}.shake{animation:.3s shake}@keyframes shake{25%{transform:translate(-6px)}75%{transform:translate(6px)}}.score-row{background:var(--white);border:1px solid var(--line);border-radius:14px;grid-template-columns:auto 1fr auto;align-items:center;gap:32px;width:100%;padding:14px 28px;display:grid}.score-time{font-size:26px;font-weight:700}.score-breakdown{color:var(--sub)}.score-gain{color:var(--green);white-space:nowrap;font-size:30px;font-weight:700}.score-gain.zero{color:var(--muted)}.key-hints{color:var(--sub);align-items:center;gap:40px;margin-top:auto;padding-top:32px;font-size:13px;display:flex}.overlay{z-index:10;background:#1f29338c;place-items:center;display:grid;position:fixed;inset:0}.dialog{background:var(--white);border-radius:20px;width:min(480px,100% - 32px);padding:36px 40px;box-shadow:0 16px 40px #1f293340}.dialog h2{font-family:var(--font-head);margin-bottom:16px;font-size:24px}.dialog p{color:var(--sub);margin:0 0 28px;line-height:1.7}.dialog-actions{grid-template-columns:1fr 1fr;gap:16px;display:grid}.result-grid{grid-template-columns:minmax(0,520px) minmax(0,1fr);gap:32px;margin:24px 0 32px;display:grid}.score-card{padding:24px 44px;position:relative;overflow:hidden}.score-card:before{content:"";background:var(--accent);width:14px;position:absolute;top:0;bottom:0;left:0}.score-big{font-family:var(--font-head);font-size:72px;font-weight:700;line-height:1.2}.score-big span{margin-left:8px;font-size:24px}.score-card p{margin:0}.tiles{flex-direction:column;gap:12px;display:flex}.tile{background:var(--white);border:1px solid var(--line);border-radius:14px;flex:1;grid-template-columns:180px 1fr auto;align-items:center;padding:8px 24px;display:grid}.tile-value{font-size:36px;font-weight:700}.tile-value small{margin-left:6px;font-size:16px}.learned-row{margin-top:8px}.weak-label{color:var(--text);margin-top:32px;font-size:15px}.weak-grid{grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:16px;display:grid}.weak-card{background:var(--paper);border:1px solid var(--line);border-left:6px solid var(--red);border-radius:12px;align-items:center;gap:16px;padding:14px 18px;display:flex}.weak-answer{font-family:var(--font-head);white-space:nowrap;min-width:88px;font-size:22px;font-weight:700}.weak-body{word-break:auto-phrase;flex-direction:column;gap:4px;display:flex}.result-actions{flex-wrap:wrap;gap:16px;margin-top:40px;display:flex}.spacer{flex:1}@media (width<=960px){.start-grid,.result-grid,.deck-grid{grid-template-columns:1fr}.play-deck{display:none}.play-stat{width:auto;min-width:64px}.play-stats{gap:16px}.tile{grid-template-columns:1fr auto}.tile .muted{display:none}.card-face{padding:20px 24px 24px 48px}.card-face:before{left:16px}}@media (prefers-reduced-motion:reduce){.card-flip,.btn,.deck-card{transition:none}.shake{animation:none}}