:root{--white:#fff;--surface:#fff;--paper-deep:#f1f5f7;--ink:#0f1720;--ink-muted:#5a6672;--ink-faint:#94a1ad;--accent:#007fff;--accent-strong:#0066d6;--accent-contrast:#fff;--accent-glow:#007fff1f;--accent-soft:#b3d4ff;--border:#e4e9ed;--shadow-color:#0f17201a;--shadow-color-subtle:#0f17200d;--danger:#e5484d;--radius-sm:6px;--radius-md:10px;--radius-lg:14px;--font-reading:system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;--font-display:system-ui, -apple-system, "Segoe UI", Roboto, sans-serif}[data-theme=dark]{--white:#14171c;--surface:#14171c;--paper-deep:#1d222a;--ink:#e9edf1;--ink-muted:#9aa7b4;--ink-faint:#6b7785;--accent:#007fff;--accent-strong:#0066d6;--accent-contrast:#fff;--accent-glow:#007fff29;--accent-soft:#1f3a5c;--border:#2a313b;--shadow-color:#00000080;--shadow-color-subtle:#0000004d;--danger:#ff6166}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:16px}body{font-family:var(--font-reading);color:var(--ink);background:var(--paper-deep);letter-spacing:-.006em;min-height:100vh;transition:background .2s,color .2s}::selection{background:var(--accent-soft);color:var(--ink)}[data-theme=dark] ::selection{background:var(--accent-soft);color:var(--ink)}#root{flex-direction:column;min-height:100vh;display:flex}@keyframes dialog-in{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}.app{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);width:100%;max-width:720px;box-shadow:0 1px 2px var(--shadow-color-subtle);flex-direction:column;flex:1;margin:24px auto;padding:36px;display:flex}.app-header{z-index:100;background:color-mix(in srgb, var(--surface) 80%, transparent);-webkit-backdrop-filter:saturate(1.2)blur(10px);backdrop-filter:saturate(1.2)blur(10px);border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:12px 20px;transition:background .2s;display:flex;position:sticky;top:0}.header-left{align-items:center;gap:12px;display:flex}.header-controls{flex-shrink:0;align-items:center;gap:8px;display:flex;position:relative}.practice-language-menu-select{border:1px solid var(--border);border-radius:var(--radius-sm);width:148px;height:34px;color:var(--ink);cursor:pointer;font-family:var(--font-reading);background:0 0;padding:0 8px;font-size:.84rem}.practice-language-menu-select:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow);outline:none}.menu-bar-button{border-radius:var(--radius-sm);width:34px;height:34px;color:var(--ink-muted);cursor:pointer;font-family:var(--font-display);letter-spacing:.02em;background:0 0;border:1px solid #0000;justify-content:center;align-items:center;font-size:.72rem;font-weight:600;transition:color .15s,background .15s,border-color .15s;display:flex}.menu-bar-button:hover{color:var(--ink);background:var(--paper-deep)}.app-title{font-family:var(--font-display);color:var(--ink);letter-spacing:-.02em;font-size:1.25rem;font-weight:700;line-height:1.1}@media (width<=760px){.app{box-shadow:none;border-left:none;border-right:none;border-radius:0;margin:0;padding:28px 20px 80px}.app-title{font-size:1.15rem}.header-left{gap:8px}.practice-language-menu-select{width:124px;font-size:.78rem}}.content{font-family:var(--font-reading);color:var(--ink);cursor:default;font-size:1.18rem;position:relative}.content[aria-busy=true]{min-height:45vh}.content-page{letter-spacing:-.003em;white-space:pre-wrap;min-height:45vh;margin:22px 0;line-height:1.8}.content-pagination{min-height:36px;color:var(--ink-muted);font-family:var(--font-display);justify-content:center;align-items:center;gap:12px;font-size:.82rem;font-weight:600;line-height:1;display:flex}.content-pagination-button{border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface);width:34px;height:34px;color:var(--ink-muted);cursor:pointer;flex:none;justify-content:center;align-items:center;transition:background .15s,border-color .15s,color 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dialog-in}.translation-dialog-text{font-family:var(--font-reading);color:var(--ink);font-size:.98rem;line-height:1.5}.translation-dialog-entry--separator{border-top:1px solid var(--border);margin-top:12px;padding-top:12px}.translation-dialog-count{font-family:var(--font-reading);color:var(--ink-faint);margin-top:8px;font-size:.75rem}.translation-dialog-known{width:100%;color:var(--ink-muted);border:1px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;background:0 0;margin-top:12px;padding:8px 12px;font-size:.8rem;font-weight:500;transition:background .15s,color .15s,border-color .15s;display:block}.translation-dialog-known:hover{background:var(--paper-deep);border-color:var(--ink-faint);color:var(--ink)}.translation-dialog-known--active{background:var(--accent-glow);color:var(--accent-strong);border-color:var(--accent)}.translation-dialog-known--active:hover{color:var(--ink-muted);border-color:var(--border);background:0 0}.reader-back{font-family:var(--font-reading);color:var(--ink-muted);align-items:center;gap:6px;margin-bottom:24px;font-size:.85rem;font-weight:500;text-decoration:none;transition:color .15s;display:inline-flex}.reader-back:hover{color:var(--accent)}.library-item{border:1px solid var(--border);border-radius:var(--radius-md);background:var(--surface);text-align:left;cursor:pointer;width:100%;font-family:var(--font-reading);gap:16px;padding:18px;transition:border-color .15s,box-shadow .15s,transform .15s;display:flex}.library-item:hover{border-color:var(--accent-soft);box-shadow:0 6px 20px var(--shadow-color-subtle);transform:translateY(-1px)}.library-item-icon{color:var(--accent);flex-shrink:0;padding-top:2px}.library-item-body{flex-direction:column;flex:1;gap:8px;min-width:0;display:flex}.library-item-title{font-family:var(--font-display);color:var(--ink);letter-spacing:-.01em;font-size:1.05rem;font-weight:600;line-height:1.3}.library-item-description{color:var(--ink-muted);font-size:.875rem;font-weight:400;line-height:1.55}.library-item-meta{flex-wrap:wrap;gap:8px;display:flex}.library-item-badge{text-transform:uppercase;letter-spacing:.05em;background:var(--paper-deep);color:var(--ink-muted);border-radius:999px;padding:3px 8px;font-size:.68rem;font-weight:600}.library-item-badge--beginner{color:#2e7d32;background:#4caf501f}.library-item-badge--intermediate{color:#e65100;background:#ff98001f}.library-item-badge--advanced{color:#c62828;background:#f443361f}[data-theme=dark] .library-item-badge--beginner{color:#81c784;background:#4caf5026}[data-theme=dark] .library-item-badge--intermediate{color:#ffb74d;background:#ff980026}[data-theme=dark] .library-item-badge--advanced{color:#ef9a9a;background:#f4433626}.library-item-progress{align-items:center;gap:10px;display:flex}.library-item-progress-bar{background:var(--border);border-radius:2px;flex:1;height:4px;overflow:hidden}.library-item-progress-fill{background:var(--accent);border-radius:2px;height:100%;transition:width .3s}.library-item-progress-label{color:var(--ink-faint);text-align:right;flex-shrink:0;min-width:28px;font-size:.7rem}.content-library{flex-direction:column;flex:1;gap:24px;display:flex}.content-library-empty{color:var(--ink-faint);flex-direction:column;flex:1;justify-content:center;align-items:center;gap:16px;display:flex}.content-library-header{justify-content:space-between;align-items:center;display:flex}.content-library-heading{font-family:var(--font-display);color:var(--ink);letter-spacing:-.02em;font-size:1.5rem;font-weight:700}.content-library-message{font-family:var(--font-reading);color:var(--ink-faint);font-size:.95rem;font-weight:400}.content-library-list{flex-direction:column;gap:12px;display:flex}.language-select-trigger{border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface);color:var(--ink-muted);font-family:var(--font-reading);cursor:pointer;outline:none;align-items:center;gap:6px;padding:7px 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input:focus,.practice-language-select:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow);outline:none}.practice-settings-field{margin-top:12px}.practice-voice-row{grid-template-columns:minmax(0,1fr) 34px;gap:8px;display:grid}.practice-voice-preview{width:34px;height:34px;color:var(--ink-muted);cursor:pointer;border-radius:6px;justify-content:center;align-items:center;display:inline-flex}.practice-voice-preview:disabled,.practice-language-select:disabled{cursor:not-allowed;opacity:.5}.practice-settings-speech-progress{text-transform:none;gap:6px;margin-top:8px;display:grid}.practice-settings-speech-progress-copy{color:var(--ink-muted);font-family:var(--font-reading);letter-spacing:0;text-transform:none;justify-content:space-between;align-items:center;gap:12px;font-size:.78rem;display:flex}.practice-settings-speech-progress-copy strong{color:var(--ink);font-variant-numeric:tabular-nums}.practice-settings-speech-progress-bar{background:var(--border);border-radius:999px;height:6px;position:relative;overflow:hidden}.practice-settings-speech-progress-bar span{border-radius:inherit;background:var(--accent);width:0;height:100%;transition:width .18s;display:block}.practice-settings-speech-progress-bar.is-indeterminate span{width:42%;animation:1.05s ease-in-out infinite practice-settings-speech-progress-slide;position:absolute;inset:0 auto 0 0}@keyframes practice-settings-speech-progress-slide{0%{transform:translate(-105%)}to{transform:translate(245%)}}.practice-cefr-segments{grid-template-columns:repeat(6,minmax(0,1fr));gap:4px;display:grid}.practice-cefr-segments button{border-radius:999px;height:30px;font-size:.74rem}.practice-cefr-segments button.is-selected{border-color:var(--accent);background:var(--accent-glow);color:var(--ink)}.practice-settings-tts{border-radius:6px;justify-content:center;align-items:center;gap:7px;width:100%;height:34px;margin-top:12px;font-size:.82rem;display:inline-flex}.practice-settings-save:hover,.practice-settings-tts:hover,.practice-voice-preview:hover:not(:disabled),.practice-cefr-segments button:hover{border-color:var(--accent);color:var(--ink)}.practice-settings-dialog-backdrop{-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);z-index:249;background:#0f172073;animation:.2s backdrop-in;position:fixed;inset:0}.practice-settings-dialog{z-index:250;border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--surface);width:min(360px,100vw - 32px);box-shadow:0 24px 70px var(--shadow-color), 0 6px 18px var(--shadow-color-subtle);padding:20px;position:fixed;top:50%;left:50%;transform:translate(-50%,-50%)}.practice-settings-dialog-title{color:var(--ink);font-family:var(--font-display);letter-spacing:-.01em;font-size:1.1rem;font-weight:700;line-height:1.1}.practice-settings-dialog-description{color:var(--ink-muted);font-family:var(--font-reading);margin-top:10px;font-size:.88rem;line-height:1.35}.practice-settings-dialog-actions{justify-content:flex-end;gap:8px;margin-top:18px;display:flex}.practice-settings-dialog-secondary,.practice-settings-dialog-primary,.practice-settings-dialog-confirm{border:1px solid var(--border);height:34px;color:var(--ink-muted);cursor:pointer;font-family:var(--font-reading);background:0 0;border-radius:999px;padding:0 12px;font-size:.82rem;transition:border-color .15s,color .15s,background .15s}.practice-settings-dialog-primary{border-color:var(--danger);background:color-mix(in srgb, var(--danger) 14%, transparent);color:var(--ink)}.practice-settings-dialog-confirm{border-color:var(--accent);background:var(--accent-glow);color:var(--ink)}.practice-settings-dialog-secondary:hover,.practice-settings-dialog-primary:hover,.practice-settings-dialog-confirm:hover{border-color:var(--accent);color:var(--ink)}@media (width<=430px){.practice-settings-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}