:root{--color-bg:#eef2f6;--color-surface:#fff;--color-surface-hover:#f6f9fb;--color-surface-active:#e9eff4;--color-surface-sunken:#dbe4ea;--color-text:#1f2933;--color-text-strong:#16202a;--color-text-secondary:#3f4f5d;--color-text-label:#283844;--color-text-muted:#53616c;--color-text-placeholder:#5f6d79;--color-border:#aeb9c4;--color-border-hover:#7f95a7;--color-border-muted:#d7dde5;--color-border-muted-hover:#9db0bf;--color-divider:#e4e9ef;--color-accent:#1f5b76;--color-accent-hover:#194b62;--color-accent-active:#143d50;--color-accent-surface:#e9f4f8;--color-on-accent:#fff;--color-focus-ring:#1f5b76;--color-favorite:#7a2148;--color-favorite-hover:#681b3d;--color-favorite-active:#571633;--color-success-text:#286140;--color-success-bg:#ecf5ef;--color-success-border:#c4dfce;--color-warning-text:#9a3412;--color-warning-bg:#fbf1e9;--color-warning-border:#eccdb4;--shadow-card:0 18px 48px #0f172a1f;--shadow-cover:0 1px 3px #10202a2e}:root[data-theme=dark]{--color-bg:#0f151b;--color-surface:#1a222b;--color-surface-hover:#232d38;--color-surface-active:#2b3542;--color-surface-sunken:#141b22;--color-text:#e6ebf0;--color-text-strong:#f4f7fa;--color-text-secondary:#c2ccd6;--color-text-label:#d3dbe3;--color-text-muted:#9aa7b3;--color-text-placeholder:#7d8a96;--color-border:#3a4650;--color-border-hover:#4d5b67;--color-border-muted:#2a343e;--color-border-muted-hover:#3c4854;--color-divider:#28323c;--color-accent:#3a8caf;--color-accent-hover:#4a9cbf;--color-accent-active:#2f7794;--color-accent-surface:#173038;--color-on-accent:#fff;--color-focus-ring:#5cb3d6;--color-favorite:#b0426a;--color-favorite-hover:#c25379;--color-favorite-active:#9a375a;--color-success-text:#7fd6a0;--color-success-bg:#16271d;--color-success-border:#2f4a39;--color-warning-text:#f0a06a;--color-warning-bg:#2b1a10;--color-warning-border:#4a3120;--shadow-card:0 18px 48px #00000073;--shadow-cover:0 1px 3px 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var(--color-divider);justify-content:space-between;align-items:flex-start;gap:16px;padding-top:18px;display:flex}.metadata-transfer-panel>div{min-width:0}.metadata-transfer-actions{flex-wrap:wrap;justify-content:flex-end;gap:10px;display:flex}.now-playing-mini{z-index:2;padding:10px clamp(16px,3vw,24px);padding-bottom:calc(10px + env(safe-area-inset-bottom));border-top:1px solid var(--color-divider);background:var(--color-surface);gap:10px;margin-top:auto;display:grid;position:sticky;bottom:0}.app-card:has(.now-playing-mini) .tab-content{padding-bottom:calc(150px + env(safe-area-inset-bottom))}.now-playing-mini-bar{justify-content:space-between;align-items:center;gap:12px;display:flex}.now-playing-mini-summary{cursor:pointer;text-align:left;background:0 0;border:0;border-radius:6px;gap:2px;min-width:0;padding:6px 8px;display:grid}.now-playing-mini-summary:hover{background:var(--color-surface-hover)}.now-playing-mini-chapter{color:var(--color-text-strong);text-overflow:ellipsis;white-space:nowrap;font-weight:800;overflow:hidden}.now-playing-mini-book{color:var(--color-text-muted);text-overflow:ellipsis;white-space:nowrap;font-size:.85rem;overflow:hidden}.play-button-mini{flex:none;min-width:104px;min-height:44px}.tab-bar{z-index:3;border-bottom:1px solid var(--color-divider);background:var(--color-surface);padding-top:env(safe-area-inset-top);border-radius:8px 8px 0 0;order:-1;grid-template-columns:repeat(6,minmax(0,1fr));display:grid;position:sticky;top:0;overflow:hidden}.help-panel{gap:14px;padding:clamp(22px,4vw,34px);display:grid}.help-panel h2{color:var(--color-text-strong);margin:0;font-size:1.25rem;line-height:1.2}.help-panel .section-label{margin:0}.help-panel p{max-width:58ch;color:var(--color-text-secondary);margin:0}.help-panel a{color:var(--color-accent);font-weight:700}.help-legal{border-top:1px solid var(--color-divider);gap:4px;margin-top:10px;padding-top:16px;display:grid}.help-legal p{color:var(--color-text-muted);font-size:.9rem}.tab-button{min-height:52px;color:var(--color-text-muted);cursor:pointer;background:0 0;border:0;border-top:3px solid #0000;border-radius:0;padding:8px 4px;font-weight:700}.tab-button:hover{color:var(--color-text);background:var(--color-surface-hover)}.tab-button[aria-current=true]{border-top-color:var(--color-accent);color:var(--color-accent);background:var(--color-accent-surface)}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;padding:0;position:absolute;overflow:hidden}@media (pointer:coarse){.download-button,.secondary-button,.speed-control select,.setting-control select,.sleep-control select,.sleep-control input,.search-mode label,input[type=range]{min-height:44px}}@media (width<=720px){.app-shell{padding:0 env(safe-area-inset-right) 0 env(safe-area-inset-left);align-items:stretch}.app-card{min-height:100svh;box-shadow:none;border:0;border-radius:0}.tab-bar{border-radius:0}.library-columns{grid-template-columns:1fr}}@media (width<=480px){.library-header,.metadata-transfer-panel{grid-template-columns:1fr;display:grid}.book-title{font-size:2rem}.book-heading{grid-template-columns:minmax(0,1fr);gap:14px}.book-heading-main{gap:14px}.book-cover-playing{width:clamp(88px,28vw,104px)}.favorite-item{grid-template-columns:minmax(0,1fr)}.favorite-actions{width:100%}.favorite-actions .secondary-button{flex:1 1 0}.search-result-button{grid-template-columns:minmax(0,1fr)}.search-result-cue{justify-self:end}.control-row,.speed-control,.setting-control{grid-template-columns:1fr;justify-items:stretch;display:grid}.play-button,.favorite-toggle,.speed-control select,.setting-control select{width:100%}.play-button-mini,.transport-play{width:auto}.tab-button{min-height:48px;padding:6px 2px;font-size:.8rem}.sleep-control,.sleep-custom,.sleep-control label{grid-template-columns:1fr;justify-items:stretch;display:grid}.sleep-control select,.sleep-control input{width:100%}.favorite-item,.history-button{grid-template-columns:1fr;justify-items:stretch}.secondary-button{width:100%}.metadata-transfer-actions{grid-template-columns:1fr;justify-content:stretch;display:grid}.history-meta{justify-items:start}}@media (width<=360px){.tab-button{font-size:.7rem}.now-playing-full .transport-row{gap:6px}.now-playing-full .transport-button{padding:0 3px;font-size:.8rem}.now-playing-full .transport-play{min-width:96px}}