:root{--bg: #0f172a;--surface: #1e293b;--surface-2: #334155;--text: #f1f5f9;--text-muted: #94a3b8;--accent: #38bdf8;--accent-strong: #0ea5e9;--border: #475569;--radius: 14px;color-scheme:dark}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Hiragino Kaku Gothic ProN,Hiragino Sans,Meiryo,sans-serif;-webkit-font-smoothing:antialiased}#root{min-height:100vh}.app{max-width:560px;margin:0 auto;min-height:100vh;display:flex;flex-direction:column;padding:16px;gap:16px}.app__header{display:flex;flex-direction:column;gap:12px}.app__title{margin:0;font-size:1.1rem;font-weight:600;color:var(--text-muted);letter-spacing:.02em}.mode-tabs{display:flex;gap:8px;background:var(--surface);padding:6px;border-radius:var(--radius)}.mode-tab{flex:1;padding:12px 8px;border:none;border-radius:10px;background:transparent;color:var(--text-muted);font-size:.95rem;font-weight:600;cursor:pointer;transition:background .15s,color .15s}.mode-tab.is-active{background:var(--accent-strong);color:#041016}.app__main{flex:1;display:flex;flex-direction:column;gap:16px}.text-panel{background:var(--surface);border-radius:var(--radius);padding:20px;position:relative;min-height:120px;display:flex;align-items:center}.text-panel__label{position:absolute;top:10px;left:14px;font-size:.7rem;font-weight:700;color:var(--text-muted);letter-spacing:.1em}.text-panel__text{margin:0;width:100%;line-height:1.6}.text-panel--en .text-panel__text{font-size:1.25rem;font-weight:600}.text-panel--ja .text-panel__text{font-size:1rem;color:var(--text-muted)}.audio-controller{background:var(--surface);border-radius:var(--radius);padding:16px;display:flex;flex-direction:column;gap:14px}.audio-controller__row{display:flex;align-items:center;gap:12px}.play-button{flex-shrink:0;width:48px;height:48px;border-radius:50%;border:none;background:var(--accent-strong);color:#041016;font-size:1.1rem;cursor:pointer;display:flex;align-items:center;justify-content:center}.seek-bar{flex:1;accent-color:var(--accent);cursor:pointer}.time-display{flex-shrink:0;font-size:.75rem;color:var(--text-muted);font-variant-numeric:tabular-nums;min-width:74px;text-align:right}.audio-controller__rates{display:flex;gap:8px;justify-content:flex-end}.rate-button{padding:6px 12px;border-radius:8px;border:1px solid var(--border);background:transparent;color:var(--text-muted);font-size:.85rem;font-weight:600;cursor:pointer}.rate-button.is-active{background:var(--accent);border-color:var(--accent);color:#041016}.autoplay-toggle{display:flex;align-items:center;gap:10px;cursor:pointer;-webkit-user-select:none;user-select:none;align-self:flex-end}.autoplay-toggle input{position:absolute;opacity:0;width:0;height:0}.autoplay-toggle__track{width:44px;height:24px;border-radius:999px;background:var(--surface-2);border:1px solid var(--border);position:relative;transition:background .15s,border-color .15s;flex-shrink:0}.autoplay-toggle__thumb{position:absolute;top:2px;left:2px;width:18px;height:18px;border-radius:50%;background:var(--text-muted);transition:transform .15s,background .15s}.autoplay-toggle input:checked+.autoplay-toggle__track{background:var(--accent-strong);border-color:var(--accent-strong)}.autoplay-toggle input:checked+.autoplay-toggle__track .autoplay-toggle__thumb{transform:translate(20px);background:#041016}.autoplay-toggle input:focus-visible+.autoplay-toggle__track{outline:2px solid var(--accent);outline-offset:2px}.autoplay-toggle__label{font-size:.9rem;color:var(--text-muted);font-weight:600}.app__footer{padding-top:4px}.nav-buttons{display:flex;align-items:center;justify-content:space-between;gap:12px}.nav-button{padding:12px 20px;border-radius:10px;border:1px solid var(--border);background:var(--surface-2);color:var(--text);font-size:.95rem;font-weight:600;cursor:pointer}.nav-button:disabled{opacity:.35;cursor:not-allowed}.nav-counter{font-size:.9rem;color:var(--text-muted);font-variant-numeric:tabular-nums}@media(max-width:380px){.time-display{display:none}}