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:root{--accent:#581987;--accent-dark:#47156d;--accent-light:#efe8f8;--accent-border:#58198740;--tag-bg:#f2efe9;--tag-text:#581987;--warn-bg:#faf3dc;--warn-border:#e3ce8b;--warn-text:#8a6a1f;--gold:#d4a82a;--bg:#f8f4ee;--surface:#fff;--text:#1e1e1e;--muted:#77717f;--border:#5819871f;--shadow-sm:0 2px 8px #5819870f;--shadow-md:0 6px 22px #5819871a;--shadow-lg:0 14px 40px #58198729;--r-sm:10px;--r-md:14px;--r-lg:20px;--r-xl:24px;--font-sans-jp:"Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic Medium", "Yu Gothic", YuGothic, Meiryo, "Noto Sans CJK JP", sans-serif;--font-serif-jp:"Hiragino Mincho ProN", "Hiragino Mincho Pro", "Yu Mincho", YuMincho, "MS PMincho", "Noto Serif CJK JP", serif}*{box-sizing:border-box;margin:0;padding:0}html,body{max-width:100vw;overflow-x:hidden}body{font-family:var(--font-sans), var(--font-sans-jp), -apple-system, BlinkMacSystemFont, "Segoe UI", 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var(--border);min-width:140px;box-shadow:var(--shadow-md);z-index:10;border-radius:12px;padding:6px;position:absolute;top:calc(100% + 8px);right:0}.account-dropdown button,.account-dropdown a{text-align:left;width:100%;color:var(--text);cursor:pointer;white-space:nowrap;background:0 0;border:none;border-radius:8px;padding:9px 12px;font-size:.85rem;font-weight:600;display:block}.account-dropdown button:hover,.account-dropdown a:hover{background:var(--bg)}.continue-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);box-shadow:var(--shadow-md);margin-bottom:22px;padding:18px;display:block;position:relative;overflow:hidden}.continue-card:after{content:"話";font-family:var(--font-serif-jp), Georgia, serif;color:#1e1e1e0d;pointer-events:none;font-size:6.5rem;font-weight:700;line-height:1;position:absolute;bottom:-28px;right:-10px}.continue-label{letter-spacing:.1em;text-transform:uppercase;color:var(--accent);font-size:.68rem;font-weight:800}.continue-title{color:var(--text);margin:3px 0 12px;font-size:1.05rem;font-weight:800}.continue-bar{background:#1e1e1e14;border-radius:999px;height:6px;margin-bottom:6px;overflow:hidden}.continue-fill{background:var(--accent);border-radius:999px;height:100%;transition:width .4s}.continue-meta{color:var(--muted);font-variant-numeric:tabular-nums;justify-content:space-between;font-size:.72rem;display:flex}.section-label{text-transform:uppercase;letter-spacing:.07em;color:var(--muted);margin:18px 0 8px;font-size:.72rem;font-weight:700}.deck-row{background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow-sm);border-radius:16px;align-items:center;gap:13px;margin-bottom:10px;padding:13px 14px;transition:transform .15s,box-shadow 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var(--border);border-radius:var(--r-md);cursor:pointer;text-align:center;box-shadow:var(--shadow-sm);margin-bottom:10px;padding:14px;font-size:.95rem;font-weight:700;transition:border-color .15s,transform .1s;display:block}.btn-secondary:hover{border-color:var(--accent)}.btn-secondary:active{transform:scale(.98)}.btn-secondary:disabled{opacity:.38;cursor:not-allowed}.btn-primary{background:var(--accent);color:#fff;border-radius:var(--r-md);cursor:pointer;text-align:center;border:none;width:100%;margin-bottom:10px;padding:15px;font-size:.95rem;font-weight:800;transition:opacity .15s,transform .1s;display:block;box-shadow:0 6px 16px #5819873d}.btn-primary:hover{opacity:.92}.btn-primary:active{transform:scale(.98)}.btn-quiet{width:100%;color:var(--muted);border-radius:var(--r-md);text-align:center;cursor:pointer;background:0 0;border:none;padding:13px;font-size:.9rem;font-weight:700;display:block}.btn-quiet:hover{color:var(--text)}.info-card{background:var(--surface);border:1px solid 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button{color:var(--muted);cursor:pointer;background:0 0;border:none;border-radius:9px;flex:1;padding:9px 8px;font-size:.8rem;font-weight:600;transition:background .15s,color .15s}.segmented button.active{background:var(--surface);color:var(--text);box-shadow:var(--shadow-sm);font-weight:800}.weak-row{margin-top:14px}.weak-row label{cursor:pointer;align-items:center;gap:10px;font-size:.875rem;display:flex}.weak-row input[type=checkbox]{width:18px;height:18px;accent-color:var(--accent);flex-shrink:0}.btn-start{background:linear-gradient(135deg, var(--accent), var(--accent-dark));color:#fff;border-radius:var(--r-lg);cursor:pointer;border:none;justify-content:center;align-items:center;gap:8px;width:100%;margin-top:22px;padding:17px;font-size:1.02rem;font-weight:800;transition:opacity .15s,transform .1s;display:flex;box-shadow:0 10px 24px #58198747}.btn-start:hover{opacity:.92}.btn-start:active{transform:scale(.98)}.btn-start:disabled{opacity:.4;cursor:not-allowed;box-shadow:none}.btn-start-count{font-variant-numeric:tabular-nums;background:#fff3;border-radius:999px;padding:2px 9px;font-size:.72rem;font-weight:800}.study-topbar{align-items:center;gap:12px;margin-bottom:18px;display:flex}.btn-close{background:var(--surface);width:30px;height:30px;color:var(--muted);box-shadow:var(--shadow-sm);cursor:pointer;border:none;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:.95rem;display:flex}.segment-bar{flex:1;gap:4px;display:flex}.segment{background:var(--border);border-radius:999px;flex:1;height:6px;transition:background-color .3s ease-out}.segment.done{background:var(--accent)}.segment.again{background:var(--warn-border)}.segment.now{background:var(--accent-border)}.study-count{color:var(--muted);font-variant-numeric:tabular-nums;flex-shrink:0;font-size:.75rem;font-weight:800}.card-scene{perspective:1100px;cursor:pointer;-webkit-user-select:none;user-select:none;margin-bottom:16px;transition:opacity .15s}.card-scene.card-fade-out{opacity:0;pointer-events:none}.card-3d{width:100%;transform-style:preserve-3d;transition:transform .5s cubic-bezier(.4,0,.2,1);position:relative}.card-3d.no-transition{transition:none}.card-3d.flipped{transform:rotateY(180deg)}.card-face{backface-visibility:hidden;border-radius:var(--r-xl);background:var(--surface);border:1px solid var(--border);width:100%;min-height:260px;max-height:70vh;box-shadow:0 1px 2px #1e1e1e0d, var(--shadow-lg);flex-direction:column;justify-content:center;align-items:center;padding:30px 22px;display:flex;overflow:hidden auto}.card-face:before{content:"";background:linear-gradient(90deg, var(--accent), var(--gold));height:3px;position:absolute;inset:0 0 auto}.card-face-hidden{position:absolute;inset:0}.card-face-active{position:relative}.card-front{transition:box-shadow .2s}.card-back{justify-content:flex-start;padding-top:18px;transition:box-shadow .2s;transform:rotateY(180deg)}.card-back .cat-badge{margin-bottom:14px}.card-scene.flash-known .card-face{box-shadow:0 0 0 3px var(--accent), var(--shadow-lg)}.card-scene.flash-again .card-face{box-shadow:0 0 0 3px var(--warn-border), var(--shadow-lg)}.cat-badge{text-transform:uppercase;letter-spacing:.08em;background:var(--tag-bg);color:var(--tag-text);border-radius:999px;flex-shrink:0;margin-bottom:22px;padding:4px 12px;font-size:.68rem;font-weight:700}.furigana-toggle{letter-spacing:.06em;background:var(--bg);color:var(--muted);cursor:pointer;border:none;border-radius:999px;padding:4px 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12px;font-size:.73rem}.btn-reveal{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:999px;width:100%;padding:16px;font-size:1rem;font-weight:700;transition:opacity .15s,transform .1s;box-shadow:0 6px 16px #5819874d}.btn-reveal:hover{opacity:.92}.btn-reveal:active{transform:scale(.98)}.action-row{grid-template-columns:1fr 1fr;gap:12px;display:grid}.btn-again{background:var(--warn-bg);color:var(--warn-text);border-radius:var(--r-lg);cursor:pointer;box-shadow:inset 0 0 0 1.5px var(--warn-border);border:none;flex-direction:column;align-items:center;gap:2px;padding:14px 8px;font-size:.92rem;font-weight:800;transition:background .15s,transform .1s;display:flex}.btn-again:active{background:#f5e8c2;transform:scale(.97)}.btn-known{background:var(--accent);color:#fff;border-radius:var(--r-lg);cursor:pointer;border:none;flex-direction:column;align-items:center;gap:2px;padding:14px 8px;font-size:.92rem;font-weight:800;transition:opacity .15s,transform 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