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var(--border);border-radius:18px;background:var(--surface);color:var(--muted);padding:12px 8px;text-align:center}.layout-option strong{color:var(--text);font-size:15px}.layout-option small{color:var(--muted-soft);font-size:12px;line-height:1.35}.layout-option:hover,.layout-option.active{border-color:color-mix(in srgb,var(--primary) 36%,var(--border));background:var(--primary-soft);color:var(--primary);transform:translateY(-2px)}.player-layout.player-main{display:grid;min-height:calc(100dvh - 64px);grid-template-columns:minmax(520px,1.1fr) minmax(420px,.9fr);gap:24px;align-items:start;padding:24px 20px 30px}.player-skeleton{pointer-events:none}.skeleton-shimmer{position:relative;overflow:hidden;background:color-mix(in srgb,var(--surface-strong) 74%,#fff)}.skeleton-shimmer:after{position:absolute;top:0;right:0;bottom:0;left:0;content:"";background:linear-gradient(90deg,transparent,rgb(255 255 255 / .72),transparent);animation:skeleton-shimmer 1.35s ease-in-out 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var(--border);border-radius:24px;background:var(--surface);box-shadow:var(--shadow)}.player-skeleton__sentence{display:grid;min-height:178px;place-items:center;gap:14px;padding:34px}.player-skeleton__line{display:block;width:min(520px,88%);height:18px;border-radius:999px}.player-skeleton__line.is-title{width:min(620px,94%);height:28px}.player-skeleton__line.is-short{width:min(360px,58%)}.player-skeleton__panel{display:grid;min-height:0;align-content:start;padding:18px}.player-skeleton__tabs{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:10px;margin-bottom:18px}.player-skeleton__tabs span{height:42px;border-radius:999px}.player-skeleton__list{display:grid;gap:12px}.player-skeleton__row{display:grid;grid-template-columns:16px minmax(0,1fr);gap:14px;border:1px solid color-mix(in srgb,var(--border) 88%,transparent);border-radius:18px;padding:18px}.player-skeleton__dot{width:10px;height:10px;border-radius:999px;margin-top:9px}.player-error-state{min-height:calc(100dvh - 96px);grid-template-columns:1fr}.player-error-state .empty-state{width:100%}@keyframes skeleton-shimmer{to{transform:translate(100%)}}.left-study,.right-study{min-width:0}.left-study{display:flex;flex-direction:column}.video-box.video-panel{position:relative;overflow:hidden;aspect-ratio:16 / 9;height:auto;border:0;border-radius:20px;background:#111827;box-shadow:0 18px 48px #0f172a1f;cursor:pointer}.video-fullscreen-target{min-width:0;position:relative}.video-fullscreen-target:fullscreen{position:relative;display:grid;width:100vw;height:100vh;overflow:hidden;place-items:center;background:#020617}.video-fullscreen-target:fullscreen .video-box.video-panel{width:100vw;height:100vh;border-radius:0;box-shadow:none}.video-fullscreen-target:fullscreen .video-box video{-o-object-fit:contain;object-fit:contain}.video-fullscreen-target:-webkit-full-screen .video-box 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video{display:block;width:100%;height:100%;aspect-ratio:auto;-o-object-fit:contain;object-fit:contain}.video-box:after{position:absolute;top:0;right:0;bottom:0;left:0;background:linear-gradient(180deg,#0f172a0d,#0f172a6b),linear-gradient(90deg,rgba(15,23,42,.3),transparent 42%);content:"";pointer-events:none}.video-media-loading{position:absolute;top:0;right:0;bottom:0;left:0;z-index:3;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;color:#fff;font-weight:850;background:radial-gradient(circle at 50% 45%,rgba(15,23,42,.16),transparent 34%),linear-gradient(180deg,#0f172a14,#0f172a52);pointer-events:none;text-shadow:0 3px 14px rgba(0,0,0,.32)}.video-media-loading svg{animation:spin .9s linear infinite;filter:drop-shadow(0 8px 20px rgba(0,0,0,.28))}.video-media-loading span{padding:8px 14px;border:1px solid rgba(255,255,255,.28);border-radius:999px;background:#0f172a6b;box-shadow:0 16px 36px #0003;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}.video-nav{position:absolute;top:12px;right:12px;z-index:2;display:flex;gap:10px;transition:opacity .18s ease,transform .18s ease}.round-btn{display:grid;width:48px;height:48px;place-items:center;border-radius:50%;background:#ffffffc7;color:#172033;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.play-big{position:absolute;z-index:2;top:50%;left:50%;display:grid;width:92px;height:92px;place-items:center;border-radius:50%;background:#ffffff29;color:#fff;transform:translate(-50%,-50%);transition:opacity .2s ease,transform .2s ease;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.video-box.is-playing .play-big{pointer-events:none;opacity:0;transform:translate(-50%,-50%) scale(.92)}.video-time{position:absolute;z-index:2;right:14px;bottom:14px;left:14px;display:flex;align-items:center;gap:10px;color:#fff;font-size:13px;font-weight:780;cursor:default;transition:opacity .18s ease,transform .18s ease}.video-box.is-controls-hidden .video-nav,.video-box.is-controls-hidden .fullscreen-exit-btn,.video-box.is-controls-hidden .video-time{pointer-events:none;visibility:hidden;opacity:0;transform:translateY(6px)}.video-progress{width:100%;height:22px;flex:1;-moz-appearance:none;appearance:none;-webkit-appearance:none;background:transparent;cursor:pointer}.video-progress:disabled{cursor:default;opacity:.72}.video-progress::-webkit-slider-runnable-track{height:4px;border-radius:999px;background:linear-gradient(90deg,#fff var(--video-progress, 0%),rgba(255,255,255,.42) var(--video-progress, 0%))}.video-progress::-webkit-slider-thumb{width:14px;height:14px;border:2px solid #fff;border-radius:50%;-moz-appearance:none;appearance:none;-webkit-appearance:none;background:var(--primary);box-shadow:0 4px 14px #0f172a38;margin-top:-5px}.video-progress::-moz-range-track{height:4px;border-radius:999px;background:#ffffff6b}.video-progress::-moz-range-progress{height:4px;border-radius:999px;background:#fff}.video-progress::-moz-range-thumb{width:14px;height:14px;border:2px solid #fff;border-radius:50%;background:var(--primary);box-shadow:0 4px 14px #0f172a38}.line{overflow:hidden;height:4px;flex:1;border-radius:999px;background:#fff6}.line span{display:block;width:38%;height:100%;border-radius:inherit;background:#fff}.controls.player-controls{display:grid;grid-template-columns:repeat(8,minmax(0,1fr));gap:10px;overflow:visible;border:0;border-radius:0;background:transparent;box-shadow:none;margin:0;padding:14px 0 12px}.ctrl{display:grid;min-height:40px;align-content:center;gap:4px;justify-items:center;min-width:0;border:0;background:transparent;color:var(--muted);font-size:12px;font-weight:720}.ctrl-label{max-width:100%;overflow:hidden;color:var(--primary);font-size:10px;font-weight:820;line-height:1;text-overflow:ellipsis;white-space:nowrap}.ctrl-icon{display:grid;width:38px;height:38px;place-items:center;border-radius:50%;background:color-mix(in srgb,var(--surface) 76%,var(--primary-soft));color:var(--primary);font-weight:900}.ctrl-icon svg{width:19px;height:19px;stroke-width:2.35}.ctrl-icon--text{font-size:12px;line-height:1}.ctrl:hover{color:var(--primary);transform:translateY(-1px)}.ctrl.is-active .ctrl-icon{background:var(--primary);color:#fff;box-shadow:0 10px 24px color-mix(in srgb,var(--primary) 28%,transparent)}.ctrl.is-active .ctrl-label{color:var(--primary)}.ctrl-popover-shell{position:relative;display:grid;min-width:0;justify-items:center}.ctrl-popover-shell>.ctrl{width:100%}.control-menu{position:absolute;bottom:calc(100% + 14px);left:50%;z-index:120;overflow:visible;border:1px solid color-mix(in srgb,var(--border) 86%,var(--primary-soft));border-radius:10px;background:color-mix(in srgb,var(--surface) 96%,var(--primary-soft));color:var(--text);box-shadow:0 18px 42px #0f172a1f;transform:translate(-50%)}.control-menu:after{position:absolute;bottom:-8px;left:50%;width:18px;height:18px;background:inherit;border-right:1px solid color-mix(in srgb,var(--border) 86%,var(--primary-soft));border-bottom:1px solid color-mix(in srgb,var(--border) 86%,var(--primary-soft));content:"";transform:translate(-50%) rotate(45deg)}.control-menu--speed{width:132px;padding:4px 0 10px}.control-menu--loop{width:164px;padding:0}.control-menu__item{position:relative;z-index:1;display:flex;width:100%;min-height:56px;align-items:center;gap:12px;border:0;border-bottom:1px solid color-mix(in srgb,var(--border) 72%,transparent);background:transparent;color:inherit;padding:0 20px;font-size:18px;font-weight:760;text-align:left;white-space:nowrap}.control-menu__item:last-child{border-bottom:0}.control-menu__item:hover,.control-menu__item.is-active{background:var(--primary-soft);color:var(--primary)}.control-menu__item--speed{justify-content:center;min-height:45px;padding:0 18px;font-size:20px;font-weight:840;text-align:center}.control-menu-enter-active,.control-menu-leave-active{transition:opacity .16s ease,transform .16s ease}.control-menu-enter-from,.control-menu-leave-to{opacity:0;transform:translate(-50%) translateY(6px)}.current-card.sentence-card{position:relative;display:grid;min-height:176px;align-content:center;gap:8px;border:1px solid color-mix(in srgb,var(--border) 74%,transparent);border-radius:20px;background:color-mix(in srgb,var(--surface) 86%,var(--primary-soft));box-shadow:0 8px 22px #0f172a0b;margin:0;padding:20px 76px 52px}.current-card__content{display:grid;min-width:0;min-height:0;align-content:center;justify-items:center;gap:clamp(6px,1vh,10px)}.current-subtitle-stack{display:grid;gap:12px}.pronunciation-recorder{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:14px;border:1px solid color-mix(in srgb,var(--primary) 12%,var(--border));border-radius:18px;background:color-mix(in srgb,var(--surface) 90%,var(--primary-soft));padding:14px 16px;box-shadow:0 8px 22px #0f172a0a}.pronunciation-recorder.is-recording{border-color:color-mix(in srgb,#ef4444 42%,var(--border));background:color-mix(in srgb,#fef2f2 52%,var(--surface))}.pronunciation-recorder__text{display:grid;gap:4px;min-width:0}.pronunciation-recorder__text strong{color:var(--text);font-size:14px;font-weight:900}.pronunciation-recorder__text span,.recording-overwrite-hint{color:var(--muted);font-size:12px;font-weight:750;line-height:1.45}.pronunciation-recorder__actions{display:flex;align-items:center;justify-content:flex-end;gap:8px;flex-wrap:wrap}.pronunciation-button{display:inline-flex;min-height:40px;align-items:center;justify-content:center;gap:8px;border:1px solid color-mix(in srgb,var(--border) 78%,transparent);border-radius:999px;background:var(--surface);color:var(--text);padding:0 14px;font-weight:880;box-shadow:0 6px 14px #0f172a0d}.pronunciation-button.is-primary{border-color:color-mix(in srgb,var(--primary) 24%,transparent);background:var(--primary);color:#fff}.pronunciation-button:disabled{cursor:not-allowed;opacity:.6}.recording-overwrite-hint{display:inline-flex;align-items:center;gap:4px}.pronunciation-error{grid-column:1 / -1;margin:0;color:#dc2626;font-size:12px;font-weight:800}.spin-icon{animation:spin .9s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.current-card-actions{position:absolute;right:18px;bottom:16px;display:flex;gap:8px}.current-card-actions button{display:grid;width:36px;height:36px;place-items:center;border:1px solid color-mix(in srgb,var(--border) 76%,transparent);border-radius:12px;background:#ffffffb8;color:var(--muted);transition:border-color .18s ease,background .18s ease,color .18s ease,transform .18s ease,box-shadow .18s ease}.current-card-actions button:hover:not(:disabled){border-color:color-mix(in srgb,var(--primary) 28%,var(--border));background:#fff;color:var(--primary);transform:translateY(-1px);box-shadow:0 10px 18px #0f172a12}.current-card-actions button:disabled{cursor:not-allowed;opacity:.58}.current-card-actions .current-record-btn{border-color:color-mix(in srgb,var(--primary) 22%,var(--border));background:color-mix(in srgb,var(--primary-soft) 74%,#fff);color:var(--primary)}.current-card-actions .current-record-btn.has-recording:not(.is-recording){background:color-mix(in srgb,var(--primary) 10%,#fff)}.current-card-actions .current-record-btn.is-recording{border-color:color-mix(in srgb,#ef4444 34%,var(--border));background:#fef2f2;color:#dc2626;box-shadow:0 0 0 8px #ef444414}.current-card-actions .current-record-play-btn{border-color:color-mix(in srgb,var(--primary) 16%,var(--border));background:color-mix(in srgb,var(--primary-soft) 48%,#fff);color:var(--primary)}.current-card-actions .current-record-play-btn.is-playing{border-color:color-mix(in srgb,var(--primary) 36%,transparent);background:var(--primary);color:#fff;box-shadow:0 10px 18px color-mix(in srgb,var(--primary) 18%,transparent)}:root[data-theme=dark] .player-page .current-card.sentence-card{border-color:#94a3b847;background:color-mix(in srgb,var(--surface) 92%,#020617);box-shadow:0 16px 34px #02061733}:root[data-theme=dark] .player-page .current-sentence .word.is-current-word,:root[data-theme=dark] .player-page .current-sentence .sentence-token.is-current-word{background:color-mix(in srgb,var(--primary) 38%,rgba(255,255,255,.14));color:#f8fafc;text-shadow:0 1px 2px rgba(2,6,23,.42);box-shadow:0 0 0 2px #c4b5fdb8,inset 0 1px #fff3,0 8px 22px #00000047}:root[data-theme=dark] .player-page .current-card-actions button{border-color:#c4b5fd42;background:#f8fafc14;color:#f8fafce0;box-shadow:0 10px 24px #0206172e}:root[data-theme=dark] .player-page .current-card-actions .current-record-btn,:root[data-theme=dark] .player-page .current-card-actions .current-record-play-btn{border-color:#c4b5fd85;background:color-mix(in srgb,var(--primary) 62%,#111827);color:#fff}:root[data-theme=dark] .player-page .current-card-actions .current-record-btn svg,:root[data-theme=dark] .player-page .current-card-actions .current-record-play-btn svg{stroke-width:2.5;filter:drop-shadow(0 1px 1px rgba(2,6,23,.36))}:root[data-theme=dark] .player-page .current-card-actions .current-record-btn.has-recording:not(.is-recording){background:color-mix(in srgb,var(--primary) 70%,#0f172a)}:root[data-theme=dark] .player-page .current-card-actions .current-record-btn.is-recording{border-color:#f87171b8;background:#dc262647;color:#fecaca;box-shadow:0 0 0 8px #f871711f}.current-recording-status{position:absolute;bottom:18px;left:50%;display:inline-flex;max-width:calc(100% - 168px);align-items:center;gap:8px;overflow:hidden;border:1px solid color-mix(in srgb,var(--primary) 18%,var(--border));border-radius:999px;background:color-mix(in srgb,var(--surface) 92%,var(--primary-soft));color:var(--primary);font-size:12px;font-weight:900;padding:7px 12px;pointer-events:none;text-align:center;transform:translate(-50%);box-shadow:0 8px 18px #0f172a0f}.current-recording-status:after{position:absolute;bottom:0;left:0;width:0;height:2px;background:currentColor;content:"";transition:width .16s linear}.current-recording-status.is-playing:after{width:var(--recording-playback-progress, 0%)}.current-recording-status.is-recording{border-color:color-mix(in srgb,#ef4444 28%,var(--border));background:color-mix(in srgb,#fff 86%,#fee2e2);color:#dc2626}.current-recording-status.is-saving{color:var(--muted)}.current-recording-status__wave{display:inline-flex;height:14px;align-items:center;gap:3px}.current-recording-status__wave span{width:3px;height:6px;border-radius:999px;background:currentColor;animation:recording-wave .86s ease-in-out infinite}.current-recording-status__wave span:nth-child(2){animation-delay:.12s}.current-recording-status__wave span:nth-child(3){animation-delay:.24s}.current-recording-status__wave span:nth-child(4){animation-delay:.36s}@keyframes recording-wave{0%,to{height:5px;opacity:.54}50%{height:14px;opacity:1}}.current-recording-error{position:absolute;right:clamp(72px,8vw,122px);bottom:24px;left:clamp(24px,5vw,72px);overflow:hidden;margin:0;color:#dc2626;font-size:12px;font-weight:850;text-align:center;text-overflow:ellipsis;white-space:nowrap}.current-sentence.en{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:center;-moz-column-gap:.34em;column-gap:.34em;row-gap:.24em;margin:0;color:var(--text);font-size:22px;font-weight:760;line-height:1.46;text-align:center}.current-zh.zh{margin:0;color:var(--muted-soft);font-size:15px;line-height:1.5;text-align:center}.word,.highlight,.learning-word,.subtitle-token{display:inline-flex;align-items:center;border-radius:10px;background:var(--vocab-bg, var(--primary-soft));color:var(--vocab-color, var(--primary));padding:2px 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srgb,var(--surface-strong) 88%,var(--primary-soft));box-shadow:inset 0 1px 2px #0f172a0f;padding:6px}.mode-tabs button{min-height:36px;flex:0 0 auto;border:0;border-radius:14px;background:transparent;color:var(--text);padding:0 18px;font-size:14px;font-weight:780}.mode-tabs button.is-active{background:var(--surface);color:var(--primary);box-shadow:0 2px 8px #0f172a0f}.right-study.subtitle-panel{position:relative;display:block;min-height:0}.learning-subtitle-list.subtitle-list{display:flex;flex-direction:column;gap:10px;overflow-y:auto;max-height:calc(100dvh - 126px);padding:4px 8px 100px 0;overscroll-behavior:contain;scroll-behavior:smooth;scrollbar-gutter:stable}.learning-subtitle-list.subtitle-list::-webkit-scrollbar{width:8px}.learning-subtitle-list.subtitle-list::-webkit-scrollbar-thumb{border:2px solid transparent;border-radius:999px;background:color-mix(in srgb,var(--muted-soft) 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