:root{color-scheme:light;--bg: #FAF7F2;--bg-card: #FFFFFF;--bg-subtle: #F0EBE3;--border: #DDD5C8;--text: #2C2016;--text-muted: #7A6860;--accent: #C19A6B;--accent-dark: #9E7A4F;--accent-light: #E8D5BC;--accent-contrast: #2C2016;--correct: #2E8B57;--correct-bg: #D4EDDA;--wrong: #C0392B;--wrong-bg: #FADBD8;--shadow: 0 1px 8px rgba(44,32,22,.08);--shadow-lg: 0 8px 32px rgba(44,32,22,.14);--radius: 14px;--radius-sm: 8px;--tab-h: 64px;--header-h: 50px;--font-display: "Hiragino Mincho ProN", "Yu Mincho", "Noto Serif JP", serif;--font-body: "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans JP", sans-serif;--font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;--font-number: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace}[data-theme=dark]{color-scheme:dark;--bg: #1A1410;--bg-card: #251E18;--bg-subtle: #2E2520;--border: #3D3028;--text: #F0E8DC;--text-muted: #9A8878;--accent: #C19A6B;--accent-dark: #D4A97A;--accent-light: #3A2E22;--accent-contrast: #2C2016;--correct: #52B788;--correct-bg: #1A3D2B;--wrong: #E05C52;--wrong-bg: #3D1A18;--shadow: 0 1px 8px rgba(0,0,0,.28);--shadow-lg: 0 8px 32px rgba(0,0,0,.5)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-text-size-adjust:100%}body{font-family:var(--font-body);background:var(--bg);color:var(--text);min-height:100dvh;line-height:1.6;-webkit-font-smoothing:antialiased;font-variant-numeric:tabular-nums lining-nums;font-feature-settings:"tnum" 1,"lnum" 1}#root{min-height:100dvh;display:flex;flex-direction:column}h1,h2,h3{font-family:var(--font-display);line-height:1.2;letter-spacing:0}button,input,select,textarea{letter-spacing:0;font-family:var(--font-body)}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid rgba(193,154,107,.45);outline:3px solid color-mix(in srgb,var(--accent) 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var(--border);z-index:100;padding-bottom:env(safe-area-inset-bottom)}.tab-bar-inner{width:100%;height:var(--tab-h);display:flex;align-items:stretch}.tab-item{flex:1;min-width:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;border:none;background:none;cursor:pointer;color:var(--text-muted);font-family:var(--font-body);font-size:.65rem;font-weight:500;transition:color .15s;padding:8px 0}.tab-item.active{color:var(--accent);font-weight:700}.tab-icon{font-size:1.3rem;line-height:1}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 24px;border:none;border-radius:var(--radius-sm);font-family:var(--font-body);font-size:.95rem;font-weight:700;cursor:pointer;transition:transform .12s,box-shadow .12s,background .15s;text-decoration:none;white-space:normal;text-align:center;overflow-wrap:anywhere;min-height:44px}.btn:active{transform:scale(.97)}.btn-primary{background:var(--accent);color:var(--accent-contrast);box-shadow:0 3px 10px #c19a6b3d}.btn-primary:hover{background:var(--accent-dark)}.btn-secondary{background:var(--bg-subtle);color:var(--text);border:1px solid var(--border)}.btn-secondary:hover{background:var(--border)}.btn-ghost{background:transparent;color:var(--text-muted);padding:8px 16px}.btn-ghost:hover{color:var(--text);background:var(--bg-subtle)}.btn-danger{background:var(--wrong);color:#fff}.btn-lg{padding:16px 36px;font-size:1.1rem;border-radius:var(--radius)}.btn-full{width:100%}.card{background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border);box-shadow:var(--shadow);min-width:0}.input{width:100%;padding:12px 16px;border:1.5px solid var(--border);border-radius:var(--radius-sm);background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:.95rem;transition:border-color .15s,box-shadow .15s;outline:none}.input:focus{border-color:var(--accent);box-shadow:0 0 0 3px #c19a6b33}.input::placeholder{color:var(--text-muted)}@keyframes fanSpin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.loading-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0000004d;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:9999}.fan{width:60px;height:60px;animation:fanSpin .8s linear infinite}.rating-badge{display:inline-flex;align-items:center;gap:6px;background:var(--accent-light);color:var(--accent-dark);border-radius:100px;padding:4px 14px;font-family:var(--font-mono);font-size:.85rem;font-weight:700}.chip{display:inline-flex;align-items:center;justify-content:center;padding:6px 16px;border-radius:100px;border:1.5px solid 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var(--border);border-radius:var(--radius);background:var(--bg-card);box-shadow:var(--shadow)}button.card{transition:background .15s,border-color .15s,transform .12s}button.card:hover{background:color-mix(in srgb,var(--bg-card) 92%,var(--accent-light))}button.card:active{transform:scale(.99)}.history-filter-tabs{grid-template-columns:repeat(5,minmax(0,1fr));margin-bottom:12px}.history-filter-tabs button{min-height:40px;padding-inline:2px;font-size:.72rem}.study-session-page{min-height:100dvh;padding-bottom:max(28px,env(safe-area-inset-bottom))}.study-next-action{width:100%;display:flex;flex-direction:column;gap:8px;margin-top:12px}.study-next-action p{font-size:.76rem}.status-badge{min-width:58px;padding:4px 8px;border-radius:100px;border:1px solid var(--border);background:var(--bg-card);color:var(--text-muted);font-size:.7rem;font-weight:700;text-align:center;white-space:nowrap}.status-badge[data-status=active]{border-color:color-mix(in srgb,var(--correct) 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