:root{color-scheme:dark;--bg: #12121a;--surface: #1c1c28;--surface-2: #262636;--text: #f2f2f7;--text-dim: #9a9ab0;--accent: #e0455a;--accent-soft: rgba(224, 69, 90, .15);--green: #4ade80;--blue: #60a5fa;--amber: #fbbf24;--red-text: #f87189;--on-accent: #ffffff;--border: rgba(255, 255, 255, .06);--border-strong: rgba(255, 255, 255, .11);--overlay: rgba(0, 0, 0, .6);--overlay-strong: rgba(0, 0, 0, .72);--toggle-off: #262636;--red-soft: rgba(224, 69, 90, .15);--amber-soft: rgba(251, 191, 36, .14);--blue-soft: rgba(96, 165, 250, .14);--green-soft: rgba(74, 222, 128, .12);--radius: 16px;--heat-1: #4f2735;--heat-2: #722e3e;--heat-3: #943547;--heat-4: #b53c4f;--heat-5: var(--accent);--stage-new: #3e3e50;--stage-learning: #37537c;--stage-young: #456ea6;--stage-mature: #528ad0;--stage-mastered: var(--blue)}[data-theme=light]{color-scheme:light;--bg: #f5f4f0;--surface: #ffffff;--surface-2: #e9e8ef;--text: #1c1c28;--text-dim: #62627a;--accent: #cf3549;--accent-soft: rgba(207, 53, 73, .1);--green: #15803d;--blue: #2563eb;--amber: #b45309;--red-text: #b02a3e;--on-accent: #ffffff;--border: rgba(28, 28, 40, .08);--border-strong: rgba(28, 28, 40, .18);--overlay: rgba(28, 28, 40, .4);--overlay-strong: rgba(28, 28, 40, .55);--toggle-off: #cbcad8;--red-soft: rgba(207, 53, 73, .1);--amber-soft: rgba(251, 191, 36, .15);--blue-soft: rgba(96, 165, 250, .15);--green-soft: rgba(74, 222, 128, .15);--heat-1: #f6dbde;--heat-2: #ecaeb6;--heat-3: #e1828e;--heat-4: #d75a6a;--heat-5: var(--accent);--stage-new: #dfdfe8;--stage-learning: #c9d8fa;--stage-young: #92b1f5;--stage-mature: #5c8af0;--stage-mastered: var(--blue)}*{box-sizing:border-box;margin:0;padding:0}html{-webkit-text-size-adjust:100%}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;min-height:100vh;min-height:100dvh}[lang=ja]{font-family:Hiragino Sans,Hiragino Kaku Gothic ProN,Noto Sans JP,Yu 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ease}.typing-feedback.is-correct{background:var(--green-soft);color:var(--green)}.typing-feedback.is-wrong{background:var(--red-soft);color:var(--red-text)}.grade-bar.one{grid-template-columns:1fr}.celebration-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:var(--overlay-strong);display:flex;align-items:center;justify-content:center;padding:20px;overflow:hidden;z-index:60}.confetti-layer{position:absolute;top:0;right:0;bottom:0;left:0;overflow:hidden;pointer-events:none}.confetti-piece{position:absolute;top:-16px;width:9px;height:14px;border-radius:2px;opacity:0;animation:confetti-fall 3s ease-in forwards}@keyframes confetti-fall{0%{opacity:1;transform:translateY(0) rotate(0)}80%{opacity:1}to{opacity:0;transform:translateY(105vh) rotate(660deg)}}.celebration{position:relative;background:var(--surface);border-radius:24px;padding:28px 24px;width:100%;max-width:400px;display:flex;flex-direction:column;align-items:center;gap:12px;text-align:center;animation:rise .25s ease}.celebration-emoji{font-size:3rem}.celebration h2{font-size:1.35rem}.celebration p{color:var(--text-dim);font-size:.9rem;max-width:30ch}.share-card{width:min(240px,60vw);height:auto;border-radius:16px;margin-top:4px}.celebration-actions{display:flex;gap:10px;margin-top:6px;width:100%}.celebration-actions .btn{flex:1}@media(prefers-reduced-motion:reduce){.confetti-piece{display:none}}.stats-screen{gap:14px}.stats-screen .study-header{margin-bottom:4px}.kpi-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.kpi{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:14px 16px;display:flex;flex-direction:column;gap:3px}.kpi-label{font-size:.72rem;font-weight:600;color:var(--text-dim)}.kpi-value{font-size:1.4rem;font-weight:700}.kpi-sub{font-size:.72rem;color:var(--text-dim)}.stats-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px 18px;display:flex;flex-direction:column;gap:12px}.stats-card h3{font-size:.72rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--text-dim)}.heatmap-wrap{display:flex;gap:6px}.heatmap-weekdays{display:grid;grid-template-rows:repeat(7,11px);row-gap:3px;font-size:.6rem;line-height:11px;color:var(--text-dim);flex-shrink:0}.heatmap-scroll{overflow-x:auto;flex:1}.heatmap{display:flex;gap:3px;width:max-content}.heatmap-col{display:flex;flex-direction:column;gap:3px}.heat-cell{width:11px;height:11px;border-radius:3px;background:var(--surface-2);flex-shrink:0}.heat-1{background:var(--heat-1)}.heat-2{background:var(--heat-2)}.heat-3{background:var(--heat-3)}.heat-4{background:var(--heat-4)}.heat-5{background:var(--heat-5)}.heat-future{background:transparent}.heat-footer{display:flex;align-items:center;justify-content:space-between;gap:6px 10px;flex-wrap:wrap}.heat-note{font-size:.7rem;color:var(--text-dim)}.heat-legend{display:flex;align-items:center;gap:3px;font-size:.68rem;color:var(--text-dim)}.heat-legend span:first-child{margin-right:3px}.heat-legend span:last-child{margin-left:3px}.forecast{display:flex;gap:6px}.forecast-day{flex:1;min-width:0;display:flex;flex-direction:column;align-items:center;gap:4px}.forecast-count{font-size:.72rem;color:var(--text-dim)}.forecast-track{width:100%;height:72px;display:flex;align-items:flex-end;justify-content:center;border-bottom:1px solid var(--surface-2)}.forecast-bar{width:20px;max-width:70%;border-radius:4px 4px 0 0;background:var(--heat-4)}.forecast-bar.is-today{background:var(--heat-5)}.forecast-label{font-size:.7rem;color:var(--text-dim);white-space:nowrap}.forecast-label.is-today{color:var(--text);font-weight:600}.forecast-stack{width:20px;max-width:70%;display:flex;flex-direction:column;border-radius:4px 4px 0 0;overflow:hidden}.forecast-stack .forecast-bar{width:100%;max-width:none;border-radius:0}.forecast-bar-new{width:100%;background:var(--stage-young);flex-shrink:0}.forecast-count-new{color:var(--blue)}.stage-list{display:flex;flex-direction:column;gap:16px}.stage-row{display:flex;flex-direction:column;gap:7px}.stage-head{display:flex;align-items:center;gap:8px;font-size:.85rem}.stage-icon{color:var(--accent)}.stage-deck{font-weight:600}.stage-total{margin-left:auto;font-size:.72rem;color:var(--text-dim);white-space:nowrap}.stage-bar{display:flex;gap:2px;height:12px;border-radius:5px;overflow:hidden}.stage-seg{min-width:4px}.stage-new{background:var(--stage-new)}.stage-learning{background:var(--stage-learning)}.stage-young{background:var(--stage-young)}.stage-mature{background:var(--stage-mature)}.stage-mastered{background:var(--stage-mastered)}.stage-chips{display:flex;flex-wrap:wrap;gap:4px 12px;font-size:.72rem;color:var(--text-dim)}.stage-chip{display:inline-flex;align-items:center;gap:5px}.stage-chip b{color:var(--text);font-weight:600}.stage-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0}.leech-list{display:flex;flex-direction:column}.leech-row{display:flex;align-items:center;gap:12px;padding:8px 0;min-height:52px}.leech-row+.leech-row{border-top:1px solid var(--border)}.leech-icon{color:var(--accent);font-size:1.1rem;flex-shrink:0}.leech-info{display:flex;flex-direction:column;gap:2px;min-width:0}.leech-front{font-size:1.25rem;font-weight:600;line-height:1.2;overflow-wrap:anywhere}.leech-meta{font-size:.72rem;color:var(--text-dim)}.leech-meta b{color:var(--red-text);font-weight:600}.btn-leech-reset{margin-left:auto;min-height:44px;padding:0 14px;border-radius:12px;background:var(--surface-2);font-size:.8rem;font-weight:600;flex-shrink:0}.leech-empty{color:var(--text-dim);font-size:.85rem}.hero{background:var(--surface);border:1px solid 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