:root{--bg: #ffffff;--surface: #ffffff;--card: #ffffff;--text: #09090b;--muted: #71717a;--border: #e4e4e7;--shadow: 0 1px 3px rgba(0, 0, 0, .1);--shadow-hover: 0 4px 12px rgba(0, 0, 0, .15);--accent: #3b82f6;--radius: 8px;--control-h: 34px;--content-max: 780px}@media(prefers-color-scheme:dark){:root{--bg: #09090b;--surface: #18181b;--card: #18181b;--text: #fafafa;--muted: #a1a1aa;--border: #27272a;--shadow: 0 1px 3px rgba(0, 0, 0, .3);--shadow-hover: 0 4px 12px rgba(0, 0, 0, .5)}}html.dark-theme,body.dark-theme{--bg: #09090b;--surface: #18181b;--card: #18181b;--text: #fafafa;--muted: #a1a1aa;--border: #27272a;--shadow: 0 1px 3px rgba(0, 0, 0, .3);--shadow-hover: 0 4px 12px rgba(0, 0, 0, .5)}html.light-theme,body.light-theme{--bg: #ffffff;--surface: #ffffff;--card: #ffffff;--text: #09090b;--muted: #71717a;--border: #e4e4e7;--shadow: 0 1px 3px rgba(0, 0, 0, .1);--shadow-hover: 0 4px 12px rgba(0, 0, 0, .15)}*{box-sizing:border-box}:focus-visible{outline:2px solid var(--accent);outline-offset:2px}:focus:not(:focus-visible){outline:none}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}html,body{height:100%}html{background-color:var(--bg)}[hidden]{display:none!important}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,Microsoft YaHei,sans-serif;color:var(--text);background-color:var(--bg);min-height:100vh;padding:20px;position:relative}.container{max-width:1200px;margin:0 auto}.hero{padding:40px 0 24px;text-align:center;position:relative}.hero h1{font-size:2.5rem;color:var(--text);font-weight:600;margin:0 0 10px;letter-spacing:-.02em}.hero p{color:var(--muted);margin:0;font-size:16px;font-weight:400}.back-inline{display:inline-flex;align-items:center;gap:6px;height:var(--control-h);padding:0 12px;border-radius:8px;border:1px solid var(--border);background-color:var(--surface);box-shadow:var(--shadow);color:inherit;flex:0 0 auto}.back-inline svg{width:14px;height:14px}.back-inline[aria-pressed=true]{background-color:var(--surface);color:var(--text);border-color:var(--text)}.back-inline.icon-only{padding:0 10px}.back-inline.icon-only svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:1.6}.segmented{display:inline-flex;gap:4px;background-color:var(--surface);border:1px solid var(--border);border-radius:8px;padding:4px;margin-top:14px}.segmented .seg{appearance:none;border:1px solid transparent;background:transparent;color:var(--text);font-size:12px;padding:8px 12px;border-radius:8px;cursor:pointer;text-decoration:none;transition:all .15s ease;white-space:nowrap}.segmented .seg.active{background-color:var(--bg);border-color:var(--text);box-shadow:var(--shadow);font-weight:600}.segmented.tiny{padding:2px;gap:2px}.segmented.tiny .seg{font-size:11px;padding:6px 8px}.segmented.tabs{padding:6px;gap:4px;margin-top:20px;display:inline-flex;background-color:var(--surface);border-radius:8px;border:1px solid var(--border)}.seg-wrap{max-width:var(--content-max);margin:0 auto;display:flex;justify-content:center}.segmented.tabs .seg{font-size:13px;font-weight:500;padding:10px 20px;border-radius:8px;border:1px solid transparent;transition:all .2s cubic-bezier(.25,.46,.45,.94);letter-spacing:.3px}.segmented.tabs .seg:hover{background:var(--bg);transform:scale(1.02)}.segmented.tabs .seg.active{background:var(--bg);color:var(--text);border-color:var(--text);box-shadow:var(--shadow);font-weight:600}@media(max-width:768px){.hero{padding:40px 0 20px}.hero h1{font-size:42px}.hero .subtitle{font-size:14px}.segmented.tabs{gap:2px;padding:4px;margin-top:16px}.segmented.tabs .seg{font-size:12px;padding:8px 16px}.lessons-grid{grid-template-columns:1fr;gap:6px}.lesson-item{padding:16px}.lesson-title{font-size:16px}}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px;padding:26px 0 64px}.card{position:relative;border:1px solid var(--border);background-color:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;transition:transform .2s ease,box-shadow .2s ease}.card:hover{transform:translateY(-4px)}.card img{width:100%;height:160px;object-fit:cover;display:block;opacity:.9}.card .body{padding:14px 14px 16px}.card .title{font-weight:700;margin:6px 0 4px}.card .sub{font-size:12px;color:var(--muted)}.last-seen-section{margin-bottom:20px;padding:8px 4px}.lessons{padding:10px 0 40px;max-width:var(--content-max);margin:0 auto}.lessons-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:8px}.lesson-item{background-color:var(--surface);border-radius:8px;border:1px solid var(--border);padding:20px;text-decoration:none;color:inherit;transition:all .2s cubic-bezier(.25,.46,.45,.94);position:relative;overflow:hidden;display:flex;align-items:center;justify-content:space-between}.lesson-item:hover{transform:scale(1.02);box-shadow:0 8px 25px #0000001f;border-color:var(--border)}.lesson-item:active{transform:scale(1.01)}.lesson-content{display:flex;flex-direction:column;justify-content:center;flex:1;min-width:0;height:100%}.lesson-num{font-size:11px;font-weight:600;color:var(--muted);letter-spacing:.5px;text-transform:uppercase;margin-bottom:4px}.lesson-title{font-size:17px;font-weight:600;line-height:1.3;color:var(--text)}.fav-btn{flex:0 0 auto;width:32px;height:32px;display:inline-flex;align-items:center;justify-content:center;background:transparent;color:var(--muted);opacity:0;transition:all .2s cubic-bezier(.25,.46,.45,.94);cursor:pointer;padding:0;margin:0;border:none;border-radius:8px}.lesson-item:hover .fav-btn{opacity:.5}.fav-btn:hover{opacity:1;color:var(--text);background:var(--surface);transform:scale(1.1)}.fav-btn.active{opacity:1;color:var(--text)}.fav-btn.active:hover{background:var(--surface)}.fav-btn svg{width:18px;height:18px;fill:currentColor}.toolbar{position:sticky;top:env(safe-area-inset-top);z-index:20;padding:6px 0;background:transparent;border-bottom:none}.toolbar,.bottom-player-bar{transition:opacity .22s ease,transform .22s ease}.toolbar .topbar-inner{display:flex;align-items:center;justify-content:space-between;gap:calc(10px * var(--lesson-ui-scale, 1));max-width:var(--content-max);margin:0 auto}.toolbar .topbar-actions{display:flex;align-items:center;gap:calc(8px * var(--lesson-ui-scale, 1))}.toolbar .back-inline{height:calc(28px * var(--lesson-ui-scale, 1));padding:0 calc(10px * var(--lesson-ui-scale, 1));font-size:calc(12px * var(--lesson-ui-scale, 1));gap:calc(6px * var(--lesson-ui-scale, 1));border-radius:calc(8px * var(--lesson-ui-scale, 1));background:var(--surface);box-shadow:var(--shadow);border-color:var(--border);cursor:pointer}.toolbar .back-inline svg{width:calc(14px * var(--lesson-ui-scale, 1));height:calc(14px * var(--lesson-ui-scale, 1))}.toolbar .back-inline:hover{background:color-mix(in srgb,var(--surface) 85%,var(--bg))}@media(max-width:480px){.toolbar{padding:6px 0}.toolbar .back-inline{height:calc(26px * var(--lesson-ui-scale, 1));padding:0 calc(9px * var(--lesson-ui-scale, 1))}}.controls{display:flex;align-items:center;gap:8px}.btn{appearance:none;border:1px solid var(--border);background:var(--surface);color:inherit;border-radius:8px;padding:6px 10px;cursor:pointer;box-shadow:var(--shadow)}.btn:hover{transform:translateY(-1px)}.sentences{padding:20px 0 40px;max-width:var(--content-max);margin:0 auto}.sentence{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;margin:12px 0;cursor:pointer;transition:all .2s ease;text-decoration:none;color:inherit;display:block;position:relative}.sentence:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover);border-color:var(--border)}.sentence.active{border:2px solid var(--text);box-shadow:0 6px 20px #0003;padding:19px}.sentence-fav-btn{position:absolute;top:12px;right:12px;width:32px;height:32px;display:inline-flex;align-items:center;justify-content:center;background:transparent;color:var(--muted);border:none;border-radius:8px;box-shadow:none;opacity:0;transition:all .2s cubic-bezier(.25,.46,.45,.94);cursor:pointer;padding:0;margin:0;z-index:4}.sentence:hover .sentence-fav-btn{opacity:.5}.sentence-fav-btn:hover{opacity:1;color:var(--text);background:var(--surface);transform:scale(1.1)}.sentence-fav-btn.active{opacity:1;color:var(--text)}.sentence-fav-btn.active:hover{background:var(--surface)}.sentence-fav-btn svg{width:18px;height:18px;fill:currentColor}body.favorites-page .sentence-fav-btn.active{opacity:0}body.favorites-page .fav-item.active .sentence-fav-btn{opacity:.9}.fav-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:8px;opacity:0;transition:opacity .2s ease}.sentence:hover .fav-actions,.sentence.active .fav-actions{opacity:1}@media(max-width:640px){body.favorites-page .fav-actions{opacity:1}}.sentence-jump-btn{display:inline-flex;align-items:center;gap:6px;height:28px;padding:0 10px;border-radius:8px;border:1px solid var(--border);background:var(--surface);color:var(--muted);box-shadow:var(--shadow);cursor:pointer;transition:transform .15s ease,color .15s ease,background .15s ease,box-shadow .15s ease;font-size:12px}.sentence-jump-btn svg{width:16px;height:16px;fill:currentColor}.sentence-jump-btn:hover{transform:translateY(-1px);color:var(--text);box-shadow:var(--shadow-hover)}.fav-meta{margin-top:8px;font-size:12px;color:var(--muted);line-height:1.35}.empty-state{max-width:420px;margin:60px auto;padding:0 20px;text-align:center;background:transparent;border:none}.empty-icon{width:72px;height:72px;margin:0 auto 24px;background:var(--surface);border:1px solid var(--border);border-radius:50%;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow)}.empty-icon svg{width:32px;height:32px;color:var(--muted);opacity:.8}.empty-state h3{font-size:1.3rem;font-weight:600;color:var(--text);margin:0 0 12px}.empty-state p{font-size:.95rem;color:var(--muted);line-height:1.6;margin:0 0 32px}.empty-action-btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 28px;background:var(--text);color:var(--bg);font-weight:600;border-radius:99px;text-decoration:none;transition:transform .2s ease,opacity .2s ease;box-shadow:var(--shadow)}.empty-action-btn:hover{transform:translateY(-2px);opacity:.9}.en{font-weight:600;font-size:1.1rem;line-height:1.5;color:var(--text)}.cn{font-size:.9rem;color:var(--muted);margin-top:8px;line-height:1.4}.lang-en .cn,.lang-cn .en{display:none}.sentence.listen-mode:not(.revealed){position:relative;cursor:pointer;min-height:60px;display:flex;align-items:center;justify-content:center;background:var(--card)}.sentence.listen-mode:not(.revealed) .en,.sentence.listen-mode:not(.revealed) .cn{opacity:0;user-select:none;-webkit-user-select:none;pointer-events:none}.sentence.listen-mode:not(.revealed):before{content:"";position:absolute;inset:0;background:var(--card);border-radius:calc(var(--radius) - 1px);z-index:1}.reveal-btn{display:none;position:absolute;align-items:center;gap:6px;padding:8px 16px;font-size:.85rem;font-weight:500;color:var(--text);background:var(--card);border:1px solid var(--border);border-radius:8px;box-shadow:var(--shadow);z-index:2;opacity:0;transition:all .2s ease;cursor:pointer;pointer-events:none}.sentence.listen-mode:not(.revealed) .reveal-btn{display:inline-flex}.sentence.listen-mode:not(.revealed):hover .reveal-btn{opacity:.7;pointer-events:auto}.sentence.listen-mode:not(.revealed):hover .reveal-btn:hover{opacity:1;transform:scale(1.02);box-shadow:var(--shadow-hover)}.reveal-btn .reveal-icon,.reveal-btn .reveal-text{display:inline-block}.sentence.listen-mode.active:not(.revealed){border:2px solid var(--text);box-shadow:0 6px 20px #0003;padding:19px;min-height:60px}.sentence.listen-mode.active:not(.revealed) .reveal-btn{opacity:.9;border-color:var(--text);color:var(--text);pointer-events:auto}.sentence.listen-mode.revealed{cursor:default}.sentence.listen-mode.revealed.active{border:2px solid var(--text);box-shadow:0 6px 20px #0003;padding:19px}.sentence.listen-mode.revealed .en,.sentence.listen-mode.revealed .cn{animation:revealText .3s ease forwards}@keyframes revealText{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}.sentence.listen-mode.revealed .reveal-btn{display:inline-flex;position:absolute;top:10px;left:12px;padding:4px 10px;font-size:.75rem;color:var(--muted);background:var(--card);border:1px solid var(--border);border-radius:8px;opacity:0;transition:opacity .2s ease;cursor:pointer;z-index:3;pointer-events:auto}.sentence.listen-mode.revealed .reveal-btn .reveal-icon{display:none}.sentence.listen-mode.revealed:hover .reveal-btn{opacity:.7;pointer-events:auto}.auto-continue-card{display:inline-flex;gap:4px;background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:4px;animation:fadeIn .2s ease-out;height:var(--control-h);align-items:center}.auto-continue-option{display:flex;align-items:center;gap:0;border-radius:8px;transition:all .15s ease}.auto-continue-option input[type=radio]{appearance:none;position:absolute;opacity:0}.auto-continue-option label{display:block;padding:6px 10px;font-size:12px;color:var(--text);cursor:pointer;border-radius:8px;border:1px solid transparent;transition:all .15s ease;margin:0;white-space:nowrap}.auto-continue-option input[type=radio]:checked+label{background:var(--bg);color:var(--text);border-color:var(--text);box-shadow:var(--shadow);font-weight:600}.auto-continue-option:hover label{background:var(--bg)}.auto-continue-option input[type=radio]:disabled+label{opacity:.5;cursor:not-allowed}.auto-continue-option input[type=radio]:disabled+label:hover{background:transparent}@keyframes fadeIn{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}@keyframes slideDown{0%{opacity:0;transform:translate(-50%,-20px)}to{opacity:1;transform:translate(-50%)}}@keyframes slideUp{0%{opacity:1;transform:translate(-50%)}to{opacity:0;transform:translate(-50%,-20px)}}@media(max-width:768px){.auto-continue-card{gap:2px;padding:3px}.auto-continue-option label{padding:5px 8px;font-size:11px}#afterPlayCard{display:none!important}}.player{display:flex;align-items:center;gap:8px;margin:6px auto 10px;padding:0;background:transparent;border:none;box-shadow:none;min-height:var(--control-h);max-width:var(--content-max);width:100%}.bottom-player-bar{position:fixed;left:50%;transform:translate(-50%);bottom:calc(10px + env(safe-area-inset-bottom));z-index:650;width:min(calc(100vw - 24px),var(--content-max));padding:0;background:transparent;border:none}body.ui-bars-hidden.lesson-page .toolbar,body.ui-bars-hidden.favorites-page .toolbar{opacity:0;transform:translateY(-14px);pointer-events:none}body.ui-bars-hidden.lesson-page .bottom-player-bar,body.ui-bars-hidden.favorites-page .bottom-player-bar{opacity:0;transform:translate(-50%) translateY(calc(100% + 18px));pointer-events:none}@media(prefers-reduced-motion:reduce){.toolbar,.bottom-player-bar{transition:none}}.bottom-player-bar .player{margin:0 auto;max-width:none;width:100%}.bottom-player-bar .custom-player{width:100%;height:calc((var(--control-h) + 6px) * var(--lesson-ui-scale, 1));border-radius:calc(12px * var(--lesson-ui-scale, 1));padding:0 calc(14px * var(--lesson-ui-scale, 1));gap:calc(8px * var(--lesson-ui-scale, 1));box-shadow:var(--shadow);background:var(--surface);border-color:var(--border)}.bottom-player-bar .custom-player:hover{box-shadow:var(--shadow-hover)}.bottom-player-bar .play-btn{width:calc(24px * var(--lesson-ui-scale, 1));height:calc(24px * var(--lesson-ui-scale, 1))}.bottom-player-bar .play-btn svg{width:calc(18px * var(--lesson-ui-scale, 1));height:calc(18px * var(--lesson-ui-scale, 1))}.bottom-player-bar .time-display{font-size:calc(11px * var(--lesson-ui-scale, 1));min-width:calc(32px * var(--lesson-ui-scale, 1))}.bottom-player-bar .progress-container{padding:0 calc(4px * var(--lesson-ui-scale, 1))}.bottom-player-bar .progress-bar{height:calc(4px * var(--lesson-ui-scale, 1));border-radius:calc(2px * var(--lesson-ui-scale, 1))}.bottom-player-bar .progress-bar:hover{height:calc(6px * var(--lesson-ui-scale, 1))}@media(max-width:480px){.bottom-player-bar{width:min(calc(100vw - 16px),var(--content-max));bottom:calc(8px + env(safe-area-inset-bottom))}.bottom-player-bar .custom-player{height:calc((var(--control-h) + 4px) * var(--lesson-ui-scale, 1));border-radius:calc(10px * var(--lesson-ui-scale, 1));padding:0 calc(12px * var(--lesson-ui-scale, 1))}}body.lesson-page{--lesson-ui-scale: 1.15;--lesson-bottom-bar-h: calc(64px * var(--lesson-ui-scale))}body.lesson-page .container{padding-bottom:calc(var(--lesson-bottom-bar-h) + env(safe-area-inset-bottom))}body.lesson-page .pwa-prompt{bottom:calc(20px + var(--lesson-bottom-bar-h) + env(safe-area-inset-bottom))}body.favorites-page{--lesson-ui-scale: 1.05;--lesson-bottom-bar-h: calc(64px * var(--lesson-ui-scale))}body.favorites-page .container{padding-bottom:calc(var(--lesson-bottom-bar-h) + env(safe-area-inset-bottom))}.custom-player{display:flex;align-items:center;gap:8px;flex:1;height:var(--control-h);background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:0 12px;box-shadow:var(--shadow);transition:all .2s ease}.custom-player:hover{box-shadow:var(--shadow-hover)}.custom-player audio{display:none}body.favorites-page .tts-player{justify-content:center;flex-wrap:nowrap}body.favorites-page .bottom-player-bar{width:auto}body.favorites-page .bottom-player-bar .player{width:auto;max-width:none;justify-content:center}body.favorites-page .bottom-player-bar .custom-player.tts-player{flex:0 0 auto;width:fit-content;max-width:calc(100vw - 24px);height:calc((var(--control-h) + 4px) * var(--lesson-ui-scale, 1));padding:0 12px}.play-btn{display:inline-flex;align-items:center;justify-content:center;width:24px;height:24px;background:transparent;border:none;color:var(--text);cursor:pointer;padding:0;transition:all .2s ease}.play-btn:hover{transform:scale(1.1)}.play-btn svg{width:18px;height:18px}.time-display{font-size:11px;font-weight:500;color:var(--muted);min-width:32px;text-align:center;font-variant-numeric:tabular-nums}.progress-container{flex:1;height:100%;display:flex;align-items:center;cursor:pointer;padding:0 4px}.progress-bar{position:relative;width:100%;height:4px;background:color-mix(in srgb,var(--border) 80%,transparent);border-radius:2px;overflow:hidden}.progress-filled{height:100%;background:var(--text);border-radius:2px;transition:width .1s linear;min-width:0}.progress-bar:hover{height:6px}.progress-bar:hover .progress-filled{height:100%}.lesson-nav{display:flex;gap:10px;padding:6px 0 16px;max-width:var(--content-max);margin:0 auto}.btn-nav{display:inline-flex;align-items:center;justify-content:center;padding:8px 14px;min-width:96px;border-radius:8px;border:1px solid var(--border);background:var(--surface);color:inherit;text-decoration:none;box-shadow:var(--shadow);transition:transform .15s ease,box-shadow .15s ease}.btn-nav:hover{transform:translateY(-2px);box-shadow:var(--shadow)}.btn-nav.prev{margin-right:auto}.btn-nav.next{margin-left:auto}.back-to-top{position:fixed;right:calc(18px + env(safe-area-inset-right));bottom:calc(18px + env(safe-area-inset-bottom));width:44px;height:44px;display:inline-flex;align-items:center;justify-content:center;background:color-mix(in srgb,var(--surface) 92%,transparent);border:1px solid var(--border);border-radius:12px;box-shadow:var(--shadow-hover);color:var(--text);cursor:pointer;z-index:700;opacity:0;transform:translateY(10px) scale(.98);pointer-events:none;transition:opacity .25s ease,transform .25s ease,box-shadow .2s ease,background .2s ease;backdrop-filter:saturate(130%) blur(8px);-webkit-backdrop-filter:saturate(130%) blur(8px)}.back-to-top svg{width:18px;height:18px}.back-to-top.show{opacity:1;transform:translateY(0) scale(1);pointer-events:auto}.pwa-prompt.show+.back-to-top{bottom:calc(96px + env(safe-area-inset-bottom))}body.lesson-page .back-to-top{bottom:calc(18px + var(--lesson-bottom-bar-h) + env(safe-area-inset-bottom))}body.lesson-page .pwa-prompt.show+.back-to-top{bottom:calc(96px + var(--lesson-bottom-bar-h) + env(safe-area-inset-bottom))}.back-to-top:hover{background:color-mix(in srgb,var(--surface) 80%,transparent);transform:translateY(-2px) scale(1.03)}.back-to-top:active{transform:translateY(0) scale(.97)}@media(max-width:480px){.back-to-top{right:calc(12px + env(safe-area-inset-right));bottom:calc(12px + env(safe-area-inset-bottom));width:40px;height:40px;border-radius:10px}.pwa-prompt.show+.back-to-top{bottom:calc(86px + env(safe-area-inset-bottom))}body.lesson-page .back-to-top{bottom:calc(12px + var(--lesson-bottom-bar-h) + env(safe-area-inset-bottom))}body.lesson-page .pwa-prompt.show+.back-to-top{bottom:calc(86px + var(--lesson-bottom-bar-h) + env(safe-area-inset-bottom))}.back-to-top svg{width:17px;height:17px}}footer{padding:32px 0;color:var(--muted);text-align:center;margin-top:40px;border-top:1px solid var(--border)}footer p{margin:6px 0;text-align:center;font-size:14px;font-weight:500}.repo{margin-bottom:8px}.gh-link{display:inline-flex;align-items:center;gap:6px;color:var(--muted);text-decoration:none;transition:all .2s ease;padding:8px 12px;border-radius:8px}.gh-link:hover{color:var(--text);background:color-mix(in srgb,var(--surface) 50%,transparent)}.byline a,.thanks a,.version a{color:var(--muted);text-decoration:none;transition:color .2s ease}.byline a:hover,.thanks a:hover,.version a:hover{color:var(--text)}.version{font-size:12px;margin-top:8px;opacity:.7}.version a{font-family:-apple-system,BlinkMacSystemFont,SF Mono,Monaco,Cascadia Code,monospace;letter-spacing:.3px}.footer-actions{margin-top:12px;display:flex;justify-content:center;gap:10px;flex-wrap:wrap}.footer-btn{display:inline-flex;align-items:center;justify-content:center;padding:6px 16px;border-radius:999px;border:1px solid var(--border);background:var(--surface);color:var(--text);text-decoration:none;font-size:12px;font-weight:600;letter-spacing:.02em;box-shadow:var(--shadow);transition:transform .2s ease,box-shadow .2s ease,background .2s ease,color .2s ease}.footer-btn:hover{transform:translateY(-1px)}.footer-btn:active{transform:translateY(0)}.page-content{max-width:820px;margin:0 auto}.page-card{padding:18px 20px}.page-card p{margin:0;font-size:14px;line-height:1.8;color:var(--muted)}.page-actions{margin-top:16px;text-align:center}.page-actions .btn{display:inline-flex;align-items:center;justify-content:center;text-decoration:none}.donate-container{max-width:680px;margin:0 auto;padding-bottom:60px}.donate-header{text-align:center;margin-bottom:40px;padding-top:20px}.donate-header h1{font-size:2.8rem;font-weight:700;margin:0 0 12px;background:linear-gradient(135deg,var(--text) 0%,var(--muted) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;letter-spacing:-.03em}.donate-header .subtitle{font-size:1.1rem;color:var(--muted);font-weight:400;letter-spacing:.02em}.donate-card{background:var(--surface);border:1px solid var(--border);border-radius:24px;padding:48px;box-shadow:var(--shadow);transition:transform .3s ease,box-shadow .3s ease;position:relative;overflow:hidden}.donate-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-2px)}.donate-message{text-align:center;margin-bottom:40px}.donate-message p{font-size:1.05rem;line-height:1.7;color:var(--muted);max-width:540px;margin:0 auto 16px}.donate-divider{height:1px;background:linear-gradient(90deg,transparent,var(--border),transparent);margin:32px auto;width:60%}.donate-qr-section{display:flex;flex-direction:column;align-items:center;gap:24px;margin:32px 0}.qr-frame{padding:16px;background:var(--bg);border:1px solid color-mix(in srgb,var(--accent) 20%,var(--border));border-radius:20px;box-shadow:0 12px 32px -8px #3b82f626;display:inline-block;transition:transform .3s cubic-bezier(.34,1.56,.64,1),box-shadow .3s ease,border-color .3s ease}.qr-frame:hover{transform:scale(1.03) rotate(-1deg);border-color:var(--accent);box-shadow:0 20px 40px -12px #3b82f640}.donate-hint{display:block;max-width:320px;margin:24px auto 0;padding:12px 16px;background:var(--bg);border:1px solid var(--border);border-radius:12px;color:var(--text);font-weight:500;font-size:.85rem;line-height:1.6;text-align:center;transition:border-color .2s}.donate-hint:hover{border-color:var(--muted)}.donate-highlight{color:var(--text);font-weight:600}.donate-scan-msg{font-size:.95rem;font-weight:500;color:var(--text);margin:0 auto 24px}.qr-frame img{display:block;width:200px;height:200px;border-radius:12px;mix-blend-mode:multiply}body.dark-theme .qr-frame img{mix-blend-mode:normal;opacity:.9}.donate-method-label{font-size:.9rem;font-weight:600;color:var(--text);letter-spacing:.05em;text-transform:uppercase;background:var(--bg);padding:8px 16px;border-radius:99px;border:1px solid var(--border)}.donate-footer-note{text-align:center;font-size:.85rem;color:var(--muted);opacity:.8;margin-top:24px;line-height:1.6}.donor-list-section{margin-top:50px}.donor-list-header{display:flex;align-items:center;justify-content:center;gap:12px;margin-bottom:24px;flex-wrap:wrap}.donate-sort-row{display:flex;justify-content:center;margin:-10px 0 18px}.donor-list-title{font-size:1.2rem;font-weight:600;color:var(--text);margin:0}.donor-count-badge{background:var(--bg);border:1px solid var(--border);color:var(--muted);font-size:.75rem;padding:2px 8px;border-radius:12px;font-weight:600}.donate-table-wrap{background:var(--surface);border:1px solid var(--border);border-radius:16px;overflow:hidden;box-shadow:0 4px 6px -1px #00000003}.donate-table{width:100%;border-collapse:collapse;font-size:.95rem}.donate-table th{text-align:left;padding:16px 24px;font-weight:500;color:var(--muted);font-size:.85rem;border-bottom:1px solid var(--border);background:color-mix(in srgb,var(--surface) 97%,var(--text))}.donate-table td{padding:16px 24px;color:var(--text);border-bottom:1px solid var(--border);transition:background .2s}.donate-table tr:last-child td{border-bottom:none}.donate-table tr:hover td{background:color-mix(in srgb,var(--bg) 50%,transparent)}.donate-amount{font-family:SF Mono,Monaco,monospace;font-weight:600;color:var(--accent)}.donate-date{color:var(--muted);font-size:.85rem}.donate-empty{text-align:center;padding:40px!important;color:var(--muted)!important;font-style:italic}.about-container{max-width:680px;margin:0 auto;padding-bottom:60px}.about-header{text-align:center;margin-bottom:40px;padding-top:20px}.about-header h1{font-size:2.8rem;font-weight:700;margin:0 0 12px;background:linear-gradient(135deg,var(--text) 0%,var(--muted) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;letter-spacing:-.03em}.about-header .subtitle{font-size:1.1rem;color:var(--muted);font-weight:400;letter-spacing:.02em}.about-card{background:var(--surface);border:1px solid var(--border);border-radius:24px;padding:48px;box-shadow:var(--shadow);transition:transform .3s ease,box-shadow .3s ease;overflow:hidden;margin-bottom:24px}.about-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-2px)}.about-section{margin-bottom:32px}.about-section:last-child{margin-bottom:0}.about-heading{font-size:.85rem;font-weight:600;text-transform:uppercase;letter-spacing:.1em;color:var(--accent);margin-bottom:16px;display:flex;align-items:center;gap:8px}.about-heading:after{content:"";flex:1;height:1px;background:var(--border);opacity:.6}.about-text{font-size:1.05rem;line-height:1.7;color:var(--text);margin-bottom:16px}.about-text p{margin:0 0 16px}.about-text p:last-child{margin:0}.legal-block{background:color-mix(in srgb,var(--bg) 60%,var(--surface));border:1px solid var(--border);border-radius:12px;padding:20px;font-size:.9rem;color:var(--muted);line-height:1.6}.legal-block strong{color:var(--text);font-weight:600}.version-list{list-style:none;padding:0;margin:0;position:relative}.version-list:before{content:"";position:absolute;top:8px;bottom:0;left:7px;width:2px;background:var(--border);border-radius:2px}.version-item{position:relative;padding-left:32px;margin-bottom:24px}.version-item:last-child{margin-bottom:0}.version-dot{position:absolute;left:0;top:8px;width:16px;height:16px;border-radius:50%;background:var(--surface);border:3px solid var(--accent);z-index:1}.version-header{display:flex;align-items:baseline;gap:10px;margin-bottom:6px;flex-wrap:wrap}.version-number{font-family:SF Mono,Monaco,monospace;font-weight:700;color:var(--text);font-size:1rem}.version-date{font-size:.85rem;color:var(--muted)}.version-desc{font-size:.95rem;color:var(--muted);line-height:1.5}@media(max-width:600px){.about-card{padding:32px 24px}.about-header h1{font-size:2.2rem}}@media(max-width:600px){.donate-card{padding:32px 24px}.donate-header h1{font-size:2.2rem}.qr-frame img{width:160px;height:160px}}.section{padding:6px 0 8px}.section-title{font-size:12px;color:var(--muted);letter-spacing:.02em;margin:4px 2px 8px}.last-seen{background:var(--surface);border-radius:8px;border:1px solid var(--border);border-left:4px solid var(--border);padding:20px;text-decoration:none;color:inherit;transition:all .2s cubic-bezier(.25,.46,.45,.94);position:relative;display:flex;align-items:center;justify-content:space-between;margin:8px 4px 16px}.last-seen:hover{transform:scale(1.02);box-shadow:0 8px 25px #0000001f;border-color:var(--border);border-left-color:var(--border)}.last-seen:active{transform:scale(1.01)}.last-seen .lesson-content:before{content:"继续学习";position:absolute;top:-6px;left:0;font-size:10px;font-weight:600;color:var(--muted);background:var(--surface);padding:0 6px;border-radius:4px;letter-spacing:.5px;text-transform:uppercase}a{color:inherit}a{text-decoration:none}.gh-link svg{width:18px;height:18px;fill:currentColor;opacity:.8;vertical-align:middle;transition:opacity .2s ease,transform .2s ease}.gh-link:hover svg{opacity:1;transform:translateY(-1px)}body,.card,.lesson-item,.sentence{transition:background-color .35s ease,color .35s ease,box-shadow .35s ease,border-color .35s ease}.settings-overlay{position:fixed;inset:0;background:#0006;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);z-index:900;transition:opacity .3s ease}.modern-settings{position:fixed;left:50%;top:50%;transform:translate(-50%,-50%) scale(.96);width:min(92vw,480px);max-height:min(85vh,720px);max-height:min(85dvh,720px);background:var(--bg);border:1px solid var(--border);border-radius:20px;box-shadow:0 10px 40px #0003;z-index:901;display:flex;flex-direction:column;opacity:0;transition:all .3s cubic-bezier(.16,1,.3,1);overflow:hidden}.modern-settings.show{transform:translate(-50%,-50%) scale(1);opacity:1}@media(max-width:640px){.modern-settings{width:min(94vw,460px);max-height:min(78dvh,680px);border-radius:18px}}.settings-overlay.show{opacity:1}.settings-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--border);background:var(--bg)}.settings-header h2{font-size:16px;font-weight:600;color:var(--text);margin:0;letter-spacing:-.01em}.close-btn{width:32px;height:32px;border-radius:16px;background:var(--surface);border:none;color:var(--muted);transition:all .2s}.close-btn:hover{background:var(--border);color:var(--text)}.settings-body{flex:1;overflow-y:auto;padding:16px 20px 20px;display:flex;flex-direction:column}.settings-group{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;padding:12px 0;border-bottom:1px solid var(--border)}.settings-group:last-child{border-bottom:none;padding-bottom:0}.settings-group.full-width{display:block}.settings-left{flex:1;min-width:0}.settings-control{flex:0 0 auto;min-width:0}.settings-header-row{display:flex;align-items:center;justify-content:space-between;gap:8px}.settings-label{font-size:14px;font-weight:600;color:var(--text);line-height:1.35}.settings-desc{margin-top:4px;font-size:12px;line-height:1.5;color:var(--muted)}.tts-select{min-width:170px;max-width:240px;width:100%;height:34px;padding:0 10px;border-radius:10px;border:1px solid var(--border);background:var(--surface);color:var(--text);font-size:13px;font-weight:500}.settings-segments{min-width:170px;max-width:240px;width:100%}.tts-select:focus{outline:none;border-color:var(--text);box-shadow:0 0 0 2px color-mix(in srgb,var(--text) 12%,transparent)}@media(max-width:640px){.settings-body{padding:14px 16px 16px}.settings-group{flex-direction:column;gap:10px;align-items:stretch}.settings-control{width:100%}.tts-select,.settings-segments{max-width:none;min-width:0}}.settings-content-scroll{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:24px}.setting-section{display:flex;flex-direction:column;gap:12px}.section-title{font-size:13px;font-weight:500;color:var(--muted);margin:0 0 4px;text-transform:uppercase;letter-spacing:.05em}.bento-card{background:var(--surface);border:1px solid var(--border);border-radius:14px;overflow:hidden;position:relative;transition:all .2s ease}.read-mode-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.mode-card{cursor:pointer;height:100px}.mode-card input{position:absolute;opacity:0;width:0;height:0}.card-content{height:100%;padding:14px;display:flex;flex-direction:column;justify-content:space-between}.icon-box svg{width:24px;height:24px;color:var(--muted);transition:color .2s}.text-box{display:flex;flex-direction:column;gap:2px}.card-title{font-size:14px;font-weight:600;color:var(--text)}.card-desc{font-size:11px;color:var(--muted)}.check-mark{position:absolute;top:12px;right:12px;color:var(--text);opacity:0;transform:scale(.5);transition:all .2s cubic-bezier(.16,1,.3,1)}.check-mark svg{width:16px;height:16px}.mode-card input:checked+.card-content{background:var(--bg)}.mode-card:has(input:checked){border-color:var(--text);box-shadow:0 4px 12px #0000000d}.mode-card input:checked+.card-content .icon-box svg{color:var(--text)}.mode-card input:checked+.card-content .check-mark{opacity:1;transform:scale(1)}.mode-card:hover{transform:translateY(-2px);border-color:var(--muted)}.bento-grid-2{display:grid;grid-template-columns:1fr 1fr;gap:12px}.control-card{padding:14px;display:flex;flex-direction:column;gap:10px}.full-card{width:100%}.card-header{display:flex;justify-content:space-between;align-items:center}.label{font-size:13px;font-weight:500;color:var(--text)}.value-display{font-size:12px;font-family:monospace;color:var(--muted);background:var(--bg);padding:2px 6px;border-radius:4px;border:1px solid var(--border)}.segmented-control{display:flex;background:var(--bg);border-radius:8px;padding:2px;border:1px solid var(--border)}.seg-btn{flex:1;border:none;background:transparent;padding:4px 0;font-size:12px;font-weight:500;color:var(--muted);border-radius:6px;cursor:pointer;transition:all .2s}.seg-btn:hover{color:var(--text)}.seg-btn.active{background:var(--surface);color:var(--text);box-shadow:0 1px 3px #0000001a;font-weight:600}.speed-segments{flex-wrap:wrap;gap:2px}.speed-segments .seg-btn{flex:1 1 calc(33.333% - 2px);min-width:0;padding:6px 0}.lang-segments{gap:2px}.lang-segments .seg-btn{padding:8px 0;font-size:13px}.lang-segments .seg-btn.active{background:var(--text);color:var(--bg)}.speed-custom-row{display:flex;align-items:center;gap:8px}.speed-custom-label{font-size:11px;color:var(--muted);white-space:nowrap}.speed-custom-field{position:relative;flex:1}.speed-custom-input{width:100%;border:1px solid var(--border);border-radius:8px;background:var(--bg);color:var(--text);padding:6px 24px 6px 10px;font-size:13px;font-weight:600;font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,Liberation Mono,Courier New,monospace;appearance:textfield}.speed-custom-input:focus{outline:none;border-color:var(--text);box-shadow:0 0 0 2px color-mix(in srgb,var(--text) 12%,transparent)}.speed-custom-input::-webkit-outer-spin-button,.speed-custom-input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}.speed-custom-unit{position:absolute;right:8px;top:50%;transform:translateY(-50%);font-size:12px;color:var(--muted);pointer-events:none}.speed-custom-hint{font-size:11px;color:var(--muted);white-space:nowrap;background:var(--bg);border:1px solid var(--border);border-radius:999px;padding:2px 6px}.select-wrapper{position:relative;width:100%}.modern-select{width:100%;appearance:none;background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:8px 10px;font-size:13px;color:var(--text);cursor:pointer}.select-arrow{position:absolute;right:10px;top:50%;transform:translateY(-50%);width:16px;height:16px;color:var(--muted);pointer-events:none}.toggles-list{background:var(--surface);border:1px solid var(--border);border-radius:14px}.toggle-row{display:flex;align-items:center;justify-content:space-between;padding:14px 16px}.toggle-row.border-top{border-top:1px solid var(--border)}.toggle-info{display:flex;flex-direction:column;gap:2px}.toggle-label{font-size:14px;font-weight:500;color:var(--text)}.toggle-desc{font-size:12px;color:var(--muted)}.switch{position:relative;display:inline-block;width:44px;height:24px;flex-shrink:0}.switch input{opacity:0;width:0;height:0}.slider{position:absolute;inset:0;background-color:var(--border);transition:.3s;border-radius:24px;cursor:pointer}.slider:before{position:absolute;content:"";height:20px;width:20px;left:2px;bottom:2px;background-color:#fff;transition:.3s cubic-bezier(.16,1,.3,1);border-radius:50%;box-shadow:0 1px 3px #0003}.dark-theme .slider:before{background-color:#f4f4f5}input:checked+.slider{background-color:var(--text)}.dark-theme input:checked+.slider{background-color:#52525b}input:checked+.slider:before{transform:translate(20px)}.shadow-config-card{padding:0}.config-row{padding:12px 16px;display:flex;align-items:center;justify-content:space-between}.config-row.border-top{border-top:1px solid var(--border)}.stepper{display:flex;align-items:center;gap:8px}.stepper-btn{width:28px;height:28px;border-radius:6px;border:1px solid var(--border);background:var(--bg);display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--text)}.stepper-btn:hover{background:var(--border)}.stepper-input{width:32px;text-align:center;border:none;background:transparent;color:var(--text);font-weight:600;font-size:14px}.segmented-control.small{padding:2px}.seg-option{cursor:pointer;position:relative}.seg-option input{opacity:0;position:absolute;width:0;height:0}.seg-option span{display:block;padding:4px 12px;font-size:12px;color:var(--muted);border-radius:6px;font-weight:500}.seg-option input:checked+span{background:var(--text);color:var(--bg)}.action-btn{width:100%;display:flex;align-items:center;padding:14px 16px;background:var(--surface);border:1px solid var(--border);border-radius:12px;color:var(--text);font-size:14px;font-weight:500;cursor:pointer;transition:all .2s}.action-btn:hover{background:var(--bg);transform:translateY(-1px)}.btn-icon{width:18px;height:18px;margin-right:12px;color:var(--muted)}.arrow-icon{width:16px;height:16px;margin-left:auto;color:var(--muted)}.data-mgmt-row{width:100%;display:flex;align-items:center;padding:14px 16px;background:none;border:none;color:var(--text);font-size:14px;font-weight:500;cursor:pointer;transition:background .2s}.data-mgmt-row:hover{background:var(--bg)}.data-mgmt-row:active{background:color-mix(in srgb,var(--bg) 80%,var(--border))}.data-mgmt-text{display:flex;flex-direction:column;align-items:flex-start;flex:1;min-width:0}.data-mgmt-label{font-size:14px;font-weight:500;color:var(--text)}.data-mgmt-desc{font-size:12px;color:var(--muted);margin-top:2px}.data-mgmt-divider{height:1px;background:var(--border);margin:0 16px}.data-confirm-overlay{position:fixed;inset:0;z-index:1100;background:#00000080;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;padding:20px;animation:fadeIn .2s ease}.data-confirm-card{background:var(--surface);border:1px solid var(--border);border-radius:20px;max-width:340px;width:100%;padding:24px;box-shadow:0 20px 60px #0000004d}.data-confirm-title{font-size:17px;font-weight:600;color:var(--text);margin:0 0 8px}.data-confirm-body{font-size:13px;color:var(--muted);margin:0 0 16px;line-height:1.5}.data-confirm-summary{font-size:13px;color:var(--text);background:var(--bg);border:1px solid var(--border);border-radius:10px;padding:12px;margin:0 0 20px;line-height:1.6}.data-confirm-actions{display:flex;justify-content:flex-end;gap:12px}.settings-footer-modern{padding:16px 20px;border-top:1px solid var(--border);background:var(--bg);display:flex;justify-content:space-between;align-items:center}.text-btn{background:none;border:none;font-size:13px;color:var(--muted);cursor:pointer;padding:8px}.text-btn:hover{color:var(--text)}.primary-btn{background:var(--text);color:var(--bg);border:none;padding:8px 24px;border-radius:20px;font-size:13px;font-weight:600;cursor:pointer;transition:transform .1s}.primary-btn:hover{transform:scale(1.02);opacity:.9}@media(max-width:480px){.read-mode-grid{grid-template-columns:1fr 1fr}.bento-grid-2{grid-template-columns:1fr}}.settings-panel .back-inline{height:28px;padding:0 10px}.settings-panel .auto-continue-card{height:auto;padding:6px}.settings-panel .auto-continue-option label{padding:6px 10px}#afterPlayCard{display:inline-flex;flex-direction:row;align-items:center;gap:4px;height:auto;padding:6px;width:auto;flex-wrap:wrap}#afterPlayCard .auto-continue-option label{display:block;white-space:nowrap;text-align:center;min-height:0;padding:6px 10px;width:auto}@media(max-width:560px){.player .back-inline:not(#backLink):not(#settingsBtn){display:none}}@media(max-width:560px){body.favorites-page .player .back-inline{display:inline-flex!important}}.shortcuts-panel{max-height:min(90vh,720px);max-height:min(90dvh,720px)}.shortcuts-group{padding:12px 0;border-bottom:1px solid color-mix(in srgb,var(--border) 50%,transparent)}.shortcuts-group:last-child{border-bottom:none}.shortcuts-group h3{font-size:13px;font-weight:600;color:var(--text);margin:0 0 10px;letter-spacing:.3px}.shortcut-item{display:flex;align-items:center;justify-content:space-between;padding:8px 0;gap:12px}.shortcut-item kbd{display:inline-flex;align-items:center;justify-content:center;min-width:32px;height:28px;padding:0 10px;border-radius:6px;border:1px solid var(--border);background:var(--surface);box-shadow:0 2px 4px #00000014,inset 0 -1px #0000001a;font-family:-apple-system,BlinkMacSystemFont,SF Mono,Monaco,Cascadia Code,monospace;font-size:12px;font-weight:500;color:var(--text);letter-spacing:.3px;white-space:nowrap}.shortcut-item span{font-size:13px;color:var(--muted);flex:1;text-align:right}.light-theme .shortcut-item kbd{background:linear-gradient(180deg,#fff,#f5f5f7);box-shadow:0 2px 4px #0000000d,inset 0 -1px #0000000f}@media(prefers-color-scheme:light){:root:not(.dark-theme) .shortcut-item kbd{background:linear-gradient(180deg,#fff,#f5f5f7);box-shadow:0 2px 4px #0000000d,inset 0 -1px #0000000f}}.dark-theme .shortcut-item kbd{background:linear-gradient(180deg,#27272a,#18181b);border-color:#3f3f46;box-shadow:0 2px 4px #0000004d,inset 0 -1px #0006}@media(prefers-color-scheme:dark){:root:not(.light-theme) .shortcut-item kbd{background:linear-gradient(180deg,#27272a,#18181b);border-color:#3f3f46;box-shadow:0 2px 4px #0000004d,inset 0 -1px #0006}}.shortcuts-tip{font-size:12px;color:var(--muted);text-align:center;margin:0 0 12px;padding:8px 12px;background:color-mix(in srgb,var(--surface) 50%,transparent);border-radius:6px;border:1px dashed var(--border)}.shortcut-item kbd.editable{cursor:pointer;transition:all .2s cubic-bezier(.25,.46,.45,.94);position:relative}.shortcut-item kbd.editable:hover{transform:translateY(-2px);box-shadow:0 4px 8px #0000001f,inset 0 -1px #0000001a;border-color:var(--text)}.shortcut-item kbd.editable:active{transform:translateY(0)}.shortcut-item kbd.editing{animation:pulse-border 1.5s ease-in-out infinite;border-color:var(--text);box-shadow:0 0 0 2px color-mix(in srgb,var(--text) 20%,transparent)}@keyframes pulse-border{0%,to{box-shadow:0 0 0 2px color-mix(in srgb,var(--text) 20%,transparent)}50%{box-shadow:0 0 0 4px color-mix(in srgb,var(--text) 10%,transparent)}}.shortcut-item kbd.conflict{border-color:#ef4444;animation:shake .4s ease-in-out}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-4px)}75%{transform:translate(4px)}}.shortcut-item kbd.custom:after{content:"•";position:absolute;top:-4px;right:-4px;font-size:14px;color:var(--text);line-height:1}.shortcut-item kbd.static{opacity:.7;cursor:default}.shortcuts-panel .settings-footer{gap:8px}.shortcuts-panel .settings-footer .btn{flex:1;min-width:0}.pwa-prompt{position:fixed;bottom:20px;right:20px;display:flex;align-items:center;gap:12px;padding:10px 12px 10px 10px;background-color:var(--surface);border:1px solid var(--border);border-radius:12px;box-shadow:0 4px 20px #00000014,0 1px 3px #0000000f;z-index:800;opacity:0;transform:translateY(10px);transition:all .3s cubic-bezier(.4,0,.2,1);pointer-events:none}.pwa-prompt.show{opacity:1;transform:translateY(0);pointer-events:auto}.pwa-prompt-icon{width:40px;height:40px;border-radius:9px;background-color:var(--bg);padding:4px;flex-shrink:0}.pwa-prompt-content{display:flex;flex-direction:column;gap:2px;flex:1;min-width:0}.pwa-prompt-title{font-size:13px;font-weight:500;color:var(--text)}.pwa-prompt-sub{font-size:11px;color:var(--muted);line-height:1.4}.pwa-prompt-sub .ios-icon{display:inline-block;width:16px;height:16px;vertical-align:middle;margin:0 2px}.pwa-prompt-btn{padding:6px 12px;background:var(--surface);color:var(--text);border:1px solid var(--border);border-radius:6px;font-size:12px;font-weight:500;cursor:pointer;box-shadow:var(--shadow);transition:transform .15s ease,box-shadow .15s ease;flex-shrink:0}.pwa-prompt-btn:hover{transform:translateY(-1px)}.pwa-prompt-close{appearance:none;-webkit-appearance:none;border:1px solid transparent;background:transparent;color:var(--muted);cursor:pointer;font-family:inherit;font-size:18px;line-height:1;width:28px;height:28px;padding:0;border-radius:8px;display:inline-flex;align-items:center;justify-content:center;opacity:1;transition:color .2s,background-color .2s,border-color .2s,transform .15s ease;flex-shrink:0}.pwa-prompt-close:hover{color:var(--text);background:var(--bg);border-color:var(--border)}.pwa-prompt-close:active{transform:scale(.96)}@media(max-width:480px){.pwa-prompt{left:12px;right:12px;bottom:12px;gap:10px}.pwa-prompt-content{flex:1}.pwa-prompt-btn{padding:6px 10px}.pwa-prompt.ios-prompt{flex-direction:column;align-items:stretch;text-align:center;padding:16px}.pwa-prompt.ios-prompt .pwa-prompt-icon{width:48px;height:48px;margin:0 auto 8px}.pwa-prompt.ios-prompt .pwa-prompt-close{position:absolute;top:8px;right:8px}}.resume-play-overlay{position:fixed;inset:0;z-index:2000;display:flex;align-items:center;justify-content:center;background:#0003;backdrop-filter:blur(2px);-webkit-backdrop-filter:blur(2px);animation:fadeIn .2s ease-out}.resume-play-card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:24px 32px;display:flex;flex-direction:column;align-items:center;gap:12px;box-shadow:var(--shadow-hover);transform:scale(.96);animation:scaleIn .2s cubic-bezier(.16,1,.3,1) forwards;cursor:pointer;text-align:center;max-width:85vw;min-width:240px}.resume-play-icon{width:42px;height:42px;color:var(--accent);margin-bottom:2px;opacity:.9}.resume-play-text{font-size:16px;font-weight:600;color:var(--text);line-height:1.4}.resume-play-subtext{font-size:13px;color:var(--muted);line-height:1.4}@keyframes scaleIn{to{transform:scale(1)}}.modal-overlay{position:fixed;inset:0;background:#00000080;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);z-index:2000;display:flex;align-items:center;justify-content:center;padding:20px;animation:fadeIn .3s ease-out}.modal-card{background:var(--surface);border:1px solid var(--border);border-radius:24px;padding:32px;max-width:400px;width:100%;box-shadow:var(--shadow-hover);text-align:center;animation:scaleIn .3s cubic-bezier(.16,1,.3,1)}.modal-icon{width:48px;height:48px;background:var(--bg);border-radius:12px;display:flex;align-items:center;justify-content:center;margin:0 auto 16px;color:var(--accent);border:1px solid var(--border)}.modal-icon svg{width:24px;height:24px}.modal-title{font-size:1.25rem;font-weight:600;color:var(--text);margin:0 0 12px}.modal-text{font-size:.95rem;color:var(--muted);line-height:1.6;margin:0 0 24px}.modal-checkbox-wrapper{display:flex;align-items:center;justify-content:center;gap:8px;margin-bottom:24px;cursor:pointer}.modal-checkbox-wrapper input[type=checkbox]{width:18px;height:18px;accent-color:var(--text);cursor:pointer}.modal-checkbox-wrapper label{font-size:.9rem;color:var(--text);cursor:pointer;-webkit-user-select:none;user-select:none}.modal-btn{width:100%;padding:12px;background:var(--text);color:var(--bg);border:none;border-radius:12px;font-size:1rem;font-weight:600;cursor:pointer;transition:opacity .2s,transform .2s}.modal-btn:disabled{opacity:.5;cursor:not-allowed}.modal-btn:not(:disabled):hover{opacity:.9;transform:translateY(-1px)}.header-actions{position:fixed;top:20px;right:calc(20px + max(0px,(100vw - 1240px))/2);top:calc(env(safe-area-inset-top,0px) + 20px);z-index:100;display:flex;flex-direction:column;gap:12px}@media(max-width:768px){.header-actions{top:16px;right:16px;top:calc(env(safe-area-inset-top,0px) + 16px)}body.lesson-page .header-actions,body.favorites-page .header-actions{top:calc(env(safe-area-inset-top,0px) + 60px)}}.icon-btn.search-trigger,.icon-btn.theme-toggle,.icon-btn.home-fav-link{width:40px;height:40px;border-radius:50%;background-color:var(--surface);border:1px solid var(--border);color:var(--text);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .2s ease;box-shadow:var(--shadow)}.icon-btn.search-trigger:hover,.icon-btn.theme-toggle:hover,.icon-btn.home-fav-link:hover{transform:scale(1.05);box-shadow:var(--shadow-hover);background-color:var(--bg)}.icon-btn.search-trigger svg,.icon-btn.theme-toggle svg,.icon-btn.home-fav-link svg{width:20px;height:20px;opacity:.8}.search-overlay{position:fixed;inset:0;z-index:800;background:#ffffff40;backdrop-filter:blur(8px) saturate(180%);-webkit-backdrop-filter:blur(8px) saturate(180%);display:flex;justify-content:center;align-items:flex-start;padding-top:12vh;opacity:0;visibility:hidden;transition:opacity .3s ease,visibility .3s}body.dark-theme .search-overlay{background:#0006}.search-overlay.open{opacity:1;visibility:visible}.search-container{width:100%;max-width:680px;margin:0 20px;background:transparent;display:flex;flex-direction:column;max-height:75vh;opacity:0;transform:translateY(-10px) scale(.96);transition:opacity .3s ease,transform .4s cubic-bezier(.16,1,.3,1)}.search-overlay.open .search-container{opacity:1;transform:translateY(0) scale(1)}.search-header{display:flex;align-items:center;gap:12px;margin-bottom:24px}.search-input-wrapper{position:relative;flex:1;display:flex;align-items:center;background:var(--surface);border:1px solid var(--border);border-radius:14px;box-shadow:0 4px 24px #00000014;height:56px;transition:box-shadow .2s ease,border-color .2s ease}.search-input-wrapper:focus-within{border-color:var(--accent);box-shadow:0 8px 30px #3b82f626}.search-icon{width:22px;height:22px;color:var(--muted);margin-left:18px;flex:0 0 auto}#searchInput{flex:1;border:none;background:transparent;height:100%;padding:0 16px 0 12px;font-size:20px;color:var(--text);outline:none;border-radius:14px}#searchInput::placeholder{color:var(--muted);opacity:.6}.search-clear{appearance:none;border:none;background:var(--muted);color:var(--bg);width:20px;height:20px;border-radius:50%;margin-right:18px;font-size:16px;line-height:1;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:opacity .2s;opacity:.5}.search-clear:hover{opacity:1}.search-cancel{appearance:none;border:none;background:transparent;color:var(--text);font-size:16px;font-weight:500;cursor:pointer;padding:8px 4px;transition:opacity .2s}.search-cancel:hover{opacity:.7}.search-body{position:relative;flex:1;overflow-y:auto;min-height:100px;-webkit-mask-image:linear-gradient(to bottom,black 90%,transparent 100%);mask-image:linear-gradient(to bottom,black 90%,transparent 100%);padding-bottom:40px;scrollbar-width:thin;scrollbar-color:var(--border) transparent}.search-body::-webkit-scrollbar{width:6px}.search-body::-webkit-scrollbar-track{background:transparent}.search-body::-webkit-scrollbar-thumb{background-color:var(--border);border-radius:3px}.search-results{display:flex;flex-direction:column;gap:12px}.search-item{display:block;text-decoration:none;background:var(--surface);border:1px solid var(--border);padding:16px;border-radius:12px;transition:all .2s ease;cursor:pointer}.search-item:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover);border-color:var(--border)}.search-item-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:6px}.search-item-tag{font-size:11px;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.5px;background:var(--bg);padding:3px 8px;border-radius:6px;border:1px solid var(--border)}.search-item-title{font-size:15px;font-weight:600;color:var(--text)}.search-item-content{font-size:14px;line-height:1.5;color:var(--muted)}.search-highlight{color:var(--accent);font-weight:600;background:#3b82f61a;padding:0 2px;border-radius:3px}.dark-theme .search-highlight{color:#60a5fa;background:#60a5fa26}.search-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:60px 0;color:var(--muted);text-align:center}.search-loading{display:flex;justify-content:center;padding:40px}.spinner{width:32px;height:32px;border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.update-toast{position:fixed;bottom:30px;left:50%;transform:translate(-50%) translateY(20px);background:var(--surface);border:1px solid var(--border);padding:14px 20px;border-radius:12px;display:flex;align-items:center;gap:16px;box-shadow:0 8px 30px #0000001f;z-index:10000;opacity:0;animation:toastSlideUp .5s cubic-bezier(.16,1,.3,1) forwards;max-width:90vw;width:auto}body.dark-theme .update-toast{background:var(--surface);border-color:var(--border);box-shadow:0 10px 40px #0006}.update-toast-text{font-size:14px;font-weight:500;color:var(--text);white-space:nowrap}.update-toast-btn{background:var(--text);color:var(--bg);border:none;padding:8px 16px;border-radius:8px;font-size:13px;font-weight:600;cursor:pointer;transition:opacity .2s,transform .2s}.update-toast-btn:hover{opacity:.9;transform:scale(1.02)}.update-toast-btn:active{transform:scale(.96)}@keyframes toastSlideUp{to{opacity:1;transform:translate(-50%) translateY(0)}}.library-toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:4px 0 16px}.library-title{display:flex;align-items:baseline;gap:10px;min-width:0}.library-title h2{font-size:15px;font-weight:600;color:var(--text);margin:0;letter-spacing:.2px}.library-count{font-size:13px;color:var(--muted)}.btn-quiet{display:inline-flex;align-items:center;gap:6px;height:var(--control-h);padding:0 14px;font-size:13px;font-weight:500;color:var(--text);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);cursor:pointer;transition:all .2s cubic-bezier(.25,.46,.45,.94)}.btn-quiet svg{width:14px;height:14px}.btn-quiet:hover{border-color:var(--text);box-shadow:var(--shadow);transform:scale(1.02)}.btn-quiet:active{transform:scale(1)}.btn-primary{display:inline-block;padding:12px 28px;background:var(--text);color:var(--bg);border:none;border-radius:12px;font-size:15px;font-weight:600;cursor:pointer;transition:opacity .2s,transform .2s}.btn-primary:hover{opacity:.9;transform:translateY(-1px)}.btn-primary:active{transform:translateY(0)}.library-empty{border:1px solid var(--border);border-radius:16px;background:var(--surface);padding:56px 24px;text-align:center;margin:8px 0 24px;transition:border-color .2s,background-color .2s}.library-empty.dragover{border-style:dashed;border-color:var(--text);background:var(--bg)}.library-empty .empty-icon{width:56px;height:56px;margin:0 auto 18px;border:1px solid var(--border);border-radius:14px;background:var(--bg);color:var(--muted);display:flex;align-items:center;justify-content:center}.library-empty .empty-icon svg{width:28px;height:28px}.library-empty h2{font-size:1.15rem;font-weight:600;color:var(--text);margin:0 0 10px}.library-empty p{font-size:14px;color:var(--muted);line-height:1.8;margin:0 0 24px}.library-empty .empty-drop-hint{margin:14px 0 0;font-size:12px;color:var(--muted);opacity:.8}@media(pointer:coarse){.library-empty .empty-drop-hint{display:none}}.import-modal-card{position:relative}.modal-close{position:absolute;top:14px;right:14px;width:30px;height:30px;border:none;border-radius:50%;background:transparent;color:var(--muted);font-size:18px;line-height:1;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background-color .2s,color .2s}.modal-close:hover{background:var(--bg);color:var(--text)}.import-options{display:flex;flex-direction:column;gap:10px;margin-bottom:8px}.import-option{display:flex;align-items:center;gap:12px;width:100%;padding:12px 14px;background:var(--bg);border:1px solid var(--border);border-radius:12px;cursor:pointer;text-align:left;color:inherit;font:inherit;transition:all .2s cubic-bezier(.25,.46,.45,.94)}.import-option:hover{border-color:var(--text);box-shadow:var(--shadow);transform:scale(1.01)}.import-option:active{transform:scale(1)}.import-option-icon{flex:0 0 auto;width:36px;height:36px;border-radius:10px;border:1px solid var(--border);background:var(--surface);color:var(--text);display:flex;align-items:center;justify-content:center}.import-option-icon svg{width:18px;height:18px}.import-option-body{display:flex;flex-direction:column;gap:2px;min-width:0}.import-option-label{font-size:14px;font-weight:600;color:var(--text)}.import-option-hint{font-size:12px;color:var(--muted)}.import-modal-status{min-height:18px;margin:4px 0 0;font-size:13px;color:var(--muted)}#privatePage[hidden],#pageStatus[hidden]{display:none}.gate{min-height:65vh;display:grid;place-content:center;padding:24px;text-align:center}.login-card{width:min(360px,85vw);display:grid;gap:12px;text-align:left}.login-card input{width:100%;padding:10px 12px;color:var(--text);background:var(--surface);border:1px solid var(--border);border-radius:10px}.login-card p,#libraryStatus{color:var(--muted)}.site-actions{display:flex;justify-content:center;gap:12px}.course-tile{position:relative}.course-tile .lesson-item{padding-right:52px;height:100%}.course-favorite{position:absolute;top:50%;right:12px;transform:translateY(-50%)}#sentences .en{user-select:text;-webkit-user-select:text}#sentences .sentence.listen-mode:not(.revealed) .en{user-select:none;-webkit-user-select:none}#lessonLoadStatus{padding:12px 0;color:var(--muted)}.word-popover{position:fixed;z-index:1200;top:max(10px,env(safe-area-inset-top));left:50%;transform:translate(-50%);width:min(620px,calc(100vw - 20px));padding:10px 12px;color:var(--text);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}.word-popover[hidden]{display:none}.word-popover-bar{display:flex;gap:6px;align-items:center;flex-wrap:wrap}.word-popover-bar strong{overflow-wrap:anywhere}.word-phonetic{color:var(--muted);font-size:.88rem}.word-popover-body{margin-top:4px;max-height:6em;line-height:1.5;overflow:auto;overscroll-behavior:contain;white-space:pre-line;overflow-wrap:anywhere}.word-feedback:empty{display:none}.course-tile:hover .course-favorite,.course-favorite:focus-visible{opacity:1}@media(hover:none){.course-favorite{opacity:.55}.course-favorite.active{opacity:1}}