*{box-sizing:border-box;margin:0;padding:0}:root{--bg:#f7f1e8;--head-bg:#fffdf9;--card:#fffdf9;--text:#38322a;--muted:#97897a;--border:#e9dfd0;--accent:#e8702a;--accent-hover:#b5551d;--accent-soft:#fbe3d2;--bubble-mine-bg:#e8702a;--bubble-mine-text:#fff7ef;--player-bg:#f9ede0;--waveform:#e3cdb4;--waveform-played:#e8702a;--danger:#e06c75;--btn-hover-shadow:0 2px 8px rgba(232,112,42,0.25);--bp-sm:480px;--bp-md:768px;--bp-lg:1024px}[data-theme=dark]{--bg:#221b13;--card:#2b2218;--text:#f4ecdf;--muted:#a59783;--border:#3d3325;--accent:#ef8442;--accent-hover:#c96b2d;--accent-soft:#46301f;--bubble-mine-bg:#c65f22;--bubble-mine-text:#fff3e8;--player-bg:#3a2e1f;--waveform:#57472f;--waveform-played:#ef8442;--btn-hover-shadow:0 2px 8px rgba(239,132,66,0.25)}body{background:var(--bg);color:var(--text);font-family:Hiragino Maru Gothic ProN,Hiragino Sans,Noto Sans JP,sans-serif;line-height:1.7;min-height:100vh}.container{max-width:480px;margin:0 auto;padding:48px 20px}@media 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var(--border);color:var(--muted);border-radius:999px}button.logout-button:hover{background:var(--border);color:var(--text)}.chat-messages{flex:1 1;padding:16px 0 32px}.chat-empty{flex:1 1;display:flex;flex-direction:column;justify-content:center;text-align:center}.date-divider{text-align:center;color:var(--muted);font-size:.75rem;margin:20px 0 12px}.bubble-row{display:flex;align-items:flex-end;gap:8px;margin-bottom:12px}.bubble{background:var(--card);border:1px solid var(--border);border-radius:20px;border-bottom-left-radius:6px;padding:12px 16px;max-width:85%}.voice-player audio{display:none}.bubble-title{font-size:.95rem}.bubble-countdown{display:flex;justify-content:space-between;align-items:baseline;gap:8px;color:var(--accent);font-size:.8rem;font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.bubble-audio-gone,.bubble-expired{color:var(--muted);font-style:italic}.bubble-audio-gone{display:flex;justify-content:space-between;align-items:baseline;gap:8px;font-size:.85rem;margin-top:8px}.bubble-time{display:inline;font-size:.7rem;color:var(--muted);margin-left:8px;white-space:nowrap}.bubble-row-mine{justify-content:flex-end}.bubble-mine{background:var(--bubble-mine-bg);border-color:var(--bubble-mine-bg);border-bottom-left-radius:20px;border-bottom-right-radius:6px;color:var(--bubble-mine-text)}.bubble-mine .bubble-time{color:rgba(255,255,255,.7)}.bubble-body{white-space:pre-wrap;word-break:break-word}.chat-input-bar{position:-webkit-sticky;position:sticky;bottom:0;background:var(--bg);padding:12px 0 16px;border-top:1px solid 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