:root{color-scheme:light;--bg:#f7f9fc;--surface:#fff;--soft:#edf1f8;--ink:#141c2b;--muted:#657187;--line:#dce3ee;--accent:#1769e0;--tint:#e7efff;--play-ink:#fff;--success:#1769e0;font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg)}
:root[data-theme=dark]{color-scheme:dark;--bg:#080e1b;--surface:#111c2f;--soft:#1b2941;--ink:#f3f6ff;--muted:#a3b1c9;--line:#293952;--accent:#8cbaff;--tint:#1b3155;--play-ink:#0c1d36;--success:#8cbaff}
*{box-sizing:border-box}body{margin:0;padding-bottom:28px}button,input,select,textarea{font:inherit;color:inherit}button{cursor:pointer;border:0}button:disabled{opacity:.45;cursor:default}[hidden]{display:none!important}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:3px}a{color:var(--accent)}h1,h2,h3,p{margin:0}h1{font-size:29px;letter-spacing:-.8px;font-weight:700;line-height:1.15}h2{font-size:21px;letter-spacing:-.5px;line-height:1.3}p{line-height:1.5}svg{width:22px;height:22px;flex-shrink:0}small{font-size:12px}.muted{color:var(--muted);font-size:13px}.eyebrow{display:block;font-size:10px;letter-spacing:1.8px;font-weight:650;color:var(--muted);margin-bottom:9px}.text-button{padding:10px 0;background:transparent;font-size:13px;color:var(--accent);text-align:left;text-decoration:none}.button{display:inline-flex;align-items:center;justify-content:center;gap:10px;border-radius:12px;padding:13px 20px;min-height:46px;font-size:14px;font-weight:600;text-decoration:none}.primary{background:var(--accent);color:var(--play-ink)}.outline{background:var(--soft);color:var(--ink)}.icon-button,.favorite-button{width:42px;height:42px;background:transparent;display:inline-flex;align-items:center;justify-content:center;border-radius:50%;color:var(--muted);flex-shrink:0}.icon-button:hover,.favorite-button:hover{background:var(--soft)}.favorite-button.selected,.completed{color:var(--accent);background:var(--tint)}.brand{display:flex;align-items:baseline;gap:7px;letter-spacing:-.8px;color:var(--ink);font-size:21px;font-weight:750}.brand span{font-size:12px;font-weight:450;letter-spacing:0;color:var(--muted)}
.app-header{height:70px;display:flex;align-items:center;justify-content:space-between;padding:0 max(28px,calc((100vw - 1100px)/2));border-bottom:1px solid var(--line);background:var(--bg)}.header-actions{display:flex;align-items:center;gap:10px}.profile-button{display:flex;align-items:center;gap:8px;background:transparent;font-size:12px}.avatar{display:grid;place-items:center;width:66px;height:66px;border-radius:50%;background:var(--tint);color:var(--accent);font-size:26px;font-weight:650}.avatar.small{width:30px;height:30px;font-size:12px}.avatar.pink{background:#f0dbe7;color:#913a68}:root[data-theme=dark] .avatar.pink{background:#392d37;color:#e7b9d5}.offline-status{font-size:10px;letter-spacing:.2px;color:var(--accent);border:1px solid var(--line);padding:5px 8px;border-radius:20px}.content{max-width:960px;margin:0 auto;padding:36px 28px 45px}.page-heading{display:flex;justify-content:space-between;align-items:center;gap:14px;margin-bottom:26px}.app-nav{position:absolute;top:15px;left:50%;transform:translateX(-50%);display:flex;gap:5px}.app-nav button{display:flex;align-items:center;justify-content:center;gap:9px;padding:11px 17px;background:transparent;color:var(--muted);border-radius:25px;font-size:13px}.app-nav button.active{color:var(--ink);background:var(--soft)}.app-nav svg{width:19px;height:19px}
.continue-card{display:grid;grid-template-columns:120px 1fr;gap:22px;padding:24px;background:var(--surface);border:1px solid var(--line);border-radius:20px;max-width:650px}.continue-art{height:120px;border-radius:16px;padding:17px;color:#eef5ff;background:linear-gradient(135deg,#508bcc,#15366a);display:flex;flex-direction:column;justify-content:space-between}.continue-art strong{font-size:42px;letter-spacing:-2px}.continue-copy{align-self:center}.continue-copy .muted{margin-top:12px}.continue-button{grid-column:1/-1;width:100%}.home-shortcuts{display:grid;grid-template-columns:1fr 1fr;gap:12px;max-width:650px;margin-top:16px}.shortcut{display:flex;align-items:center;gap:10px;text-align:left;background:var(--soft);border-radius:13px;padding:17px 18px;font-size:13px}.shortcut svg{color:var(--muted);width:20px;height:20px}.shortcut strong{margin-left:auto;color:var(--muted);font-size:12px;font-weight:500}
.level-tabs{display:flex;gap:5px;padding:4px;border-radius:12px;background:var(--soft);width:fit-content;margin-bottom:20px}.level-tabs button{padding:11px 18px;border-radius:9px;background:transparent;color:var(--muted);font-size:13px}.level-tabs button.active{background:var(--surface);color:var(--ink)}.course-tools{display:flex;align-items:center;gap:12px;margin-bottom:22px}.course-tools input{flex:1;width:0;min-width:0;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:14px 16px;font-size:16px}.course-tools select{max-width:155px;min-height:48px;font-size:13px}.course-tools select,select{border:1px solid var(--line);background:var(--soft);border-radius:10px;padding:10px}.unit{margin-bottom:13px;border:1px solid var(--line);border-radius:14px;overflow:hidden;background:var(--surface)}.unit summary{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:20px;cursor:pointer;list-style:none}.unit summary::-webkit-details-marker{display:none}.unit summary strong{font-size:14px;font-weight:650;line-height:1.45}.unit summary>span{display:flex;align-items:center;gap:13px;font-size:11px;color:var(--muted);white-space:nowrap}.chevron{font-size:18px}.unit[open] .chevron{transform:rotate(180deg)}.lesson-list{background:var(--surface);border-radius:12px;overflow:hidden}.lesson-entry{display:flex;align-items:center;border-top:1px solid var(--line);padding-right:10px}.lesson-entry:first-child{border-top:0}.lesson-row{display:flex;align-items:center;gap:16px;flex:1;min-width:0;background:transparent;text-align:left;padding:18px 20px;color:var(--ink)}.lesson-row:hover{background:var(--soft)}.lesson-number{font-size:12px;color:var(--muted);min-width:30px;font-variant-numeric:tabular-nums}.lesson-copy{flex:1;min-width:0}.lesson-copy strong{font-size:14px;line-height:1.5;font-weight:550}.lesson-copy small{display:block;color:var(--muted);font-size:11px;margin-top:5px}.lesson-state{font-size:11px;color:var(--accent)}.lesson-state svg{width:16px;height:16px}.lesson-note{width:23px;height:23px;border-radius:6px;background:var(--tint);color:var(--accent);display:grid;place-items:center}.lesson-note svg{width:14px;height:14px}.pdf-match{display:flex;flex-direction:column;align-items:flex-start;gap:8px;background:var(--bg);color:var(--muted);text-align:left;border:1px solid var(--line);border-radius:10px;margin:0 18px 14px;padding:12px 14px;font-size:12px;line-height:1.7;width:calc(100% - 36px)}.pdf-match small{color:var(--accent)}.pdf-match mark{color:var(--ink);background:var(--tint);border-radius:3px;padding:0 2px}.search-count{font-size:12px;color:var(--muted);margin-bottom:16px}.empty{padding:30px 14px;text-align:center;font-size:13px;color:var(--muted)}
.lesson-content{max-width:760px;padding-top:16px}.lesson-top{display:flex;align-items:center;gap:10px;margin-bottom:10px}.lesson-top>span{font-size:12px;color:var(--muted);flex:1}.lesson-actions{display:flex;gap:3px}.lesson-stage{max-width:550px;margin:auto}.player-mode{display:flex;justify-content:center;gap:4px;margin:0 auto 12px;width:fit-content;background:var(--soft);border-radius:24px;padding:3px}.player-mode button{font-size:12px;padding:7px 19px;border-radius:20px;background:transparent;color:var(--muted)}.player-mode .active{background:var(--surface);color:var(--ink)}.media-player{position:relative;border-radius:16px;overflow:hidden}.audio-mode{display:grid;place-items:center;min-height:215px}.track-art{position:relative;width:215px;height:215px;border-radius:23px;padding:24px;color:#e7f0ff;background:radial-gradient(ellipse at 90% 10%,#527cad 0,transparent 65%),linear-gradient(140deg,#203d68,#0c1b34);overflow:hidden;display:flex;flex-direction:column;justify-content:space-between;box-shadow:0 8px 25px #0001}.track-art>span{font-size:9px;letter-spacing:2px;font-weight:600}.track-art>strong{font-size:65px;letter-spacing:-4px;line-height:1;font-weight:550}.art-lines{position:absolute;display:flex;align-items:center;gap:6px;right:21px;bottom:23px;height:55px;opacity:.32}.art-lines i{display:block;width:3px;height:28px;background:#d8e9ff;border-radius:2px}.art-lines i:nth-child(3n){height:50px}.art-lines i:nth-child(2n){height:17px}.video-mode{background:#000;aspect-ratio:16/9}.video-mode video{width:100%;height:100%;display:block;object-fit:contain}.video-fullscreen{position:absolute;right:10px;bottom:10px;width:35px;height:35px;display:grid;place-items:center;border-radius:10px;color:#fff;background:#0008}.video-fullscreen svg{width:17px;height:17px}.track-caption{margin:20px 0 14px}.track-caption>p{color:var(--muted);font-size:11px;margin-bottom:7px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.track-caption h1{font-size:24px;line-height:1.25;letter-spacing:-.6px}#asset-select{display:block;width:100%;font-size:12px;margin-top:10px;padding:9px}
.player-timeline input,[data-audio-seek]{appearance:none;-webkit-appearance:none;width:100%;height:22px;background:transparent;margin:0;cursor:pointer}.player-timeline input::-webkit-slider-runnable-track,[data-audio-seek]::-webkit-slider-runnable-track{height:4px;border-radius:5px;background:linear-gradient(to right,var(--accent) var(--played,0%),var(--line) var(--played,0%))}.player-timeline input::-webkit-slider-thumb,[data-audio-seek]::-webkit-slider-thumb{appearance:none;-webkit-appearance:none;width:13px;height:13px;background:var(--accent);border-radius:50%;margin-top:-4.5px}.player-timeline input::-moz-range-track,[data-audio-seek]::-moz-range-track{height:4px;background:var(--line)}.player-timeline input::-moz-range-progress,[data-audio-seek]::-moz-range-progress{background:var(--accent);height:4px}.player-timeline input::-moz-range-thumb,[data-audio-seek]::-moz-range-thumb{border:0;width:13px;height:13px;border-radius:50%;background:var(--accent)}.player-times{display:flex;justify-content:space-between;color:var(--muted);font-size:11px;font-variant-numeric:tabular-nums;margin-top:-2px}.player-controls{display:flex;align-items:center;justify-content:space-between;max-width:340px;margin:12px auto 10px}.main-play{width:62px;height:62px;border-radius:50%;background:var(--accent);color:var(--play-ink);display:grid;place-items:center}.main-play svg{width:28px;height:28px}.skip-button{position:relative;background:transparent;color:var(--ink);width:44px;height:44px;display:grid;place-items:center}.skip-button svg{width:29px;height:29px}.skip-button small{position:absolute;top:18px;font-size:8px;font-weight:650}.player-options{display:flex;justify-content:space-between;align-items:center;min-height:40px}.player-options select{background:transparent;border:0;font-size:12px;padding:7px 10px;color:var(--muted)}.mode-switch{display:flex;align-items:center;gap:9px;background:transparent;font-size:12px;padding:9px 0;color:var(--muted)}.mode-switch svg{width:17px;height:17px}.mode-switch i{display:block;width:31px;height:18px;background:var(--line);border-radius:15px;position:relative}.mode-switch i:after{content:"";position:absolute;left:3px;top:3px;width:12px;height:12px;background:var(--muted);border-radius:50%}.mode-switch[aria-pressed=true] i{background:var(--accent)}.mode-switch[aria-pressed=true] i:after{left:16px;background:var(--play-ink)}.lesson-tools{display:flex;justify-content:space-around;gap:5px;margin-top:14px;border-top:1px solid var(--line);padding-top:10px}.lesson-tools button{display:flex;align-items:center;justify-content:center;flex-direction:column;gap:6px;min-width:58px;padding:7px;background:transparent;font-size:10px;color:var(--muted);border-radius:10px}.lesson-tools button:hover{background:var(--soft)}.lesson-tools svg{width:21px;height:21px}.lesson-tools .is-saved{color:var(--accent)}.save-status{display:block;text-align:center;font-size:10px;color:var(--muted);margin-top:8px}
.action-sheet,.pdf-sheet{border:0;padding:0;background:var(--surface);color:var(--ink);box-shadow:0 0 80px #0004}.action-sheet{width:min(540px,calc(100% - 40px));max-height:85dvh;border-radius:22px}.action-sheet::backdrop,.pdf-sheet::backdrop{background:#0009;backdrop-filter:blur(4px)}.sheet-header{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;border-bottom:1px solid var(--line);position:sticky;top:0;background:var(--surface);z-index:3}.sheet-header h2{font-size:17px;font-weight:650;letter-spacing:-.2px}.sheet-body{padding:20px;overflow:auto;max-height:calc(85dvh - 71px)}.sheet-body>.muted{margin-bottom:17px}.auto-next{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--muted);margin-top:20px;padding:7px 0}.auto-next input{accent-color:var(--accent);width:17px;height:17px}.timed-note{display:flex;align-items:flex-start;gap:12px;padding:14px 0;border-bottom:1px solid var(--line);font-size:13px;line-height:1.5}.timed-note>span{flex:1;overflow-wrap:anywhere}.timestamp{background:var(--tint);color:var(--accent);padding:7px 9px;border-radius:8px;font-size:12px;white-space:nowrap}.timed-note .text-button{font-size:21px;padding:2px 6px;color:var(--muted)}.note-capture{width:100%;margin-top:18px}.note-capture svg{width:18px;height:18px}#timed-draft{margin-top:17px}#timed-label{display:block;color:var(--muted);font-size:12px;margin-bottom:8px}#timed-text{display:block;width:100%;min-height:95px;resize:vertical;border:1px solid var(--line);border-radius:12px;background:var(--bg);padding:13px;font-size:16px;line-height:1.5}#add-timed-note{margin-top:10px;float:right}.legacy-note{margin-top:23px;font-size:12px;color:var(--muted)}.legacy-note p{white-space:pre-wrap;margin-top:10px}.download-row{padding:16px 0;border-bottom:1px solid var(--line)}.download-row:first-child{padding-top:0}.download-row:last-child{border-bottom:0}.download-row-heading{display:flex;align-items:center;gap:10px;font-size:13px}.download-row-heading svg{color:var(--muted);width:20px;height:20px}.download-audio{padding-left:30px;margin-top:4px}.download-audio button{font-size:12px;min-height:40px}.download-audio small{display:block;font-size:11px;color:var(--muted);line-height:1.5}.download-audio .remove-download{margin-left:15px;color:var(--muted)}
.pdf-sheet{width:min(1100px,100%);height:100dvh;max-height:100dvh;max-width:100%;border-radius:0;margin:0 auto;inset:0}.pdf-sheet .sheet-header{height:60px;padding-top:calc(8px + env(safe-area-inset-top))}.pdf-sheet .sheet-body{padding:0;display:flex;flex-direction:column;max-height:none;height:calc(100% - 60px)}.pdf-canvas-wrap{flex:1;min-height:0;overflow:auto;background:#e3e8f0;text-align:center;padding:16px;overscroll-behavior:contain;position:relative}.pdf-canvas-wrap canvas{display:block;margin:0 auto;box-shadow:0 2px 15px #0002;background:#fff}.pdf-canvas-wrap p{font-size:13px;color:#4a586d;padding:30px}.pdf-controls{display:flex;align-items:center;justify-content:center;gap:16px;padding:8px 16px calc(8px + env(safe-area-inset-bottom));background:var(--surface);border-top:1px solid var(--line);flex-shrink:0}.pdf-controls input{width:43px;padding:5px;border:0;background:var(--soft);border-radius:6px;font-size:16px;text-align:center}.pdf-controls label{font-size:12px;color:var(--muted);white-space:nowrap}.pdf-controls select{font-size:12px;padding:8px;max-width:100px}.pdf-sheet #pdf-asset-select{flex-shrink:0;font-size:12px;border-radius:0;border:0}.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}
.progress-summary{max-width:650px;background:var(--surface);border:1px solid var(--line);padding:27px;border-radius:20px;margin-bottom:28px}.progress-summary>strong{font-size:72px;font-weight:550;letter-spacing:-4px;line-height:1.1}.progress-summary>strong small{font-size:25px;letter-spacing:-1px;margin-left:5px;color:var(--muted)}.progress-summary p{font-size:13px;color:var(--muted);margin:12px 0 20px}.meter{height:5px;background:var(--soft);border-radius:10px;overflow:hidden}.meter i{display:block;height:100%;background:var(--accent);border-radius:10px}.level-progress{max-width:650px}.level-progress>div{margin-bottom:24px}.progress-label{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;font-size:14px}.progress-label span{font-size:12px;color:var(--muted)}
.profile-screen{max-width:800px;padding:30px;margin:auto}.profile-top{display:flex;align-items:center;justify-content:space-between}.profile-panel{max-width:420px;margin:100px auto 0;text-align:center}.profile-panel h1{margin-bottom:30px}.profiles{display:grid;grid-template-columns:1fr 1fr;gap:16px}.profile-choice{background:var(--surface);border:1px solid var(--line);border-radius:20px;display:flex;align-items:center;flex-direction:column;gap:17px;padding:30px 20px;font-size:15px}.profile-choice strong{font-weight:550}#login-error{font-size:12px;color:#bd665a;margin-top:20px}
#audio-dock{position:fixed;z-index:30;bottom:16px;left:50%;transform:translateX(-50%);width:min(600px,calc(100% - 32px));border:1px solid var(--line);background:var(--surface);border-radius:14px;box-shadow:0 4px 20px #0002;padding:8px 12px 2px}.dock-heading{display:flex;align-items:center;gap:10px}.dock-art{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,#5683ba,#1a355d);color:#e4efff;display:grid;place-items:center;font-size:18px}.dock-heading #dock-track{flex:1;overflow:hidden;white-space:nowrap;text-overflow:ellipsis;min-width:0;font-size:12px;color:var(--ink);font-weight:550;padding:8px 0}.dock-heading .audio-play{width:37px;height:37px;background:transparent;color:var(--ink);display:grid;place-items:center}.dock-heading .audio-play svg{width:23px;height:23px}.dock-heading #close-audio{width:32px;height:32px;font-size:22px}.dock-heading .icon-button{border:0}#audio-dock [data-audio-seek]{height:9px;display:block}#audio-dock [data-audio-seek]::-webkit-slider-runnable-track{height:2px}#audio-dock [data-audio-seek]::-webkit-slider-thumb{width:7px;height:7px;margin-top:-2.5px}.has-audio .content{padding-bottom:110px}#toast{position:fixed;z-index:100;bottom:24px;left:50%;transform:translateX(-50%);background:var(--ink);color:var(--bg);padding:13px 18px;border-radius:12px;max-width:90vw;font-size:12px;opacity:0;pointer-events:none;box-shadow:0 5px 15px #0002}#toast.visible{opacity:1}.has-audio #toast{bottom:95px}
@media(max-width:700px){body{padding-bottom:calc(74px + env(safe-area-inset-bottom))}.app-header{height:58px;padding:0 19px;border-bottom:0}.brand{font-size:20px}.brand span{font-size:11px}.profile-button>span:last-child{display:none}.header-actions{gap:4px}.header-actions .icon-button{width:34px;height:34px}.header-actions .icon-button svg{width:18px;height:18px}.content{padding:23px 20px 24px}.page-heading{margin-bottom:21px}h1{font-size:27px}.app-nav{position:fixed;z-index:40;top:auto;bottom:0;left:0;transform:none;width:100%;height:calc(68px + env(safe-area-inset-bottom));padding:7px 16px calc(7px + env(safe-area-inset-bottom));background:var(--surface);border-top:1px solid var(--line);justify-content:space-around;gap:0}.app-nav button{border-radius:0;flex:1;flex-direction:column;gap:4px;font-size:10px;font-weight:500;padding:4px 8px}.app-nav button.active{background:transparent;color:var(--accent)}.app-nav svg{width:23px;height:23px}.app-nav button.active svg{stroke-width:2}.continue-card{grid-template-columns:90px 1fr;gap:17px;padding:20px;border-radius:17px}.continue-art{height:100px;padding:14px;border-radius:12px}.continue-art strong{font-size:37px}.continue-art svg{width:19px;height:19px}.continue-copy h2{font-size:19px}.continue-copy .eyebrow{font-size:8px;letter-spacing:1px}.continue-copy .muted{font-size:11px}.continue-button{font-size:13px}.home-shortcuts{gap:10px}.shortcut{padding:16px 13px;font-size:12px;gap:8px}.shortcut svg{width:17px;height:17px}.level-tabs{width:100%;margin-bottom:16px}.level-tabs button{flex:1;padding:10px 8px;font-size:11px}.course-tools{gap:8px;margin-bottom:18px}.course-tools input{padding:12px;width:0}.course-tools select{font-size:12px;max-width:123px;min-height:44px;padding:10px 8px}.unit summary{padding:17px}.unit summary strong{font-size:13px}.unit summary>span{font-size:10px;gap:8px}.lesson-row{padding:15px 13px;gap:10px}.lesson-copy strong{font-size:12px}.lesson-copy small{font-size:10px}.lesson-entry{padding-right:4px}.lesson-number{min-width:26px;font-size:10px}.lesson-state{font-size:10px}.favorite-button{width:35px;height:40px}.favorite-button svg{width:18px;height:18px}.lesson-note{width:20px;height:20px}.lesson-note svg{width:12px;height:12px}.pdf-match{margin:0 12px 12px;padding:10px 12px;width:calc(100% - 24px);font-size:11px}.lesson-content{padding:5px 20px 15px}.lesson-top{margin-bottom:7px;gap:4px}.lesson-top>span{font-size:11px}.lesson-top .icon-button{width:35px;height:35px}.lesson-top .favorite-button{width:35px;height:35px}.lesson-top .icon-button svg{width:19px;height:19px}.player-mode{margin-bottom:9px}.player-mode button{font-size:11px;padding:6px 19px}.audio-mode{min-height:clamp(157px,23dvh,200px)}.track-art{width:clamp(157px,23dvh,200px);height:clamp(157px,23dvh,200px);padding:19px;border-radius:18px}.track-art>strong{font-size:58px}.track-art>span{font-size:8px;letter-spacing:1.7px}.art-lines{height:45px;bottom:20px;right:20px;gap:4px}.art-lines i{width:2px}.track-caption{margin:15px 0 9px}.track-caption>p{font-size:10px;margin-bottom:6px}.track-caption h1{font-size:22px;line-height:1.2}.player-controls{max-width:300px;margin:10px auto 7px}.main-play{width:57px;height:57px}.player-times{font-size:10px}.player-options{min-height:36px}.player-options select{padding:6px}.mode-switch{font-size:11px;gap:8px}.mode-switch i{width:29px;height:17px}.mode-switch i:after{width:11px;height:11px}.mode-switch[aria-pressed=true] i:after{left:15px}.lesson-tools{margin-top:9px;padding-top:8px}.lesson-tools button{font-size:10px;padding:6px;gap:4px}.lesson-tools svg{width:20px;height:20px}.save-status{font-size:9px;margin-top:5px}#asset-select{font-size:11px;margin-top:7px;padding:7px}.action-sheet{margin:auto 0 0;width:100%;max-height:88dvh;max-width:100%;border-radius:22px 22px 0 0;padding-bottom:env(safe-area-inset-bottom)}.sheet-header{padding:12px 18px}.sheet-body{padding:18px;max-height:calc(88dvh - 67px)}.pdf-sheet{width:100%;margin:0;border-radius:0}.pdf-sheet .sheet-header{padding:8px 12px;height:55px}.pdf-sheet .sheet-body{height:calc(100% - 55px)}.pdf-controls{gap:9px;padding-left:8px;padding-right:8px}.pdf-controls select{font-size:12px}.pdf-controls .icon-button{width:34px;height:34px}.progress-summary{padding:24px}.progress-summary>strong{font-size:66px}.profile-screen{padding:22px}.profile-panel{margin-top:85px}#audio-dock{bottom:calc(77px + env(safe-area-inset-bottom));width:calc(100% - 24px);padding:7px 10px 2px;border-radius:12px}.has-audio .content{padding-bottom:105px}#toast{bottom:calc(85px + env(safe-area-inset-bottom));width:max-content;max-width:calc(100% - 40px)}.has-audio #toast{bottom:calc(145px + env(safe-area-inset-bottom))}}
@media(max-height:720px) and (max-width:700px){.track-art{width:140px;height:140px;padding:17px}.audio-mode{min-height:140px}.track-art>strong{font-size:46px}.track-caption{margin-top:10px}.track-caption h1{font-size:20px}.player-controls{margin-top:7px}.main-play{width:51px;height:51px}.lesson-tools{margin-top:5px}}
.note-context{display:block;font-size:10px;color:var(--muted);margin-top:4px}@media(max-width:700px){select{font-size:16px!important}.course-tools select{max-width:140px}.pdf-controls select{max-width:106px}}
.unit-picker-wrap{margin-bottom:18px}.unit-picker-row{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:12px}.unit-picker-row select{font-size:14px;min-width:145px}.unit-picker-row>span{font-size:11px;white-space:nowrap}.unit-topic{font-size:18px;font-weight:600;color:var(--ink);line-height:1.4;letter-spacing:-.3px}@media(max-width:700px){.unit-topic{font-size:16px}.unit-picker-wrap{margin-bottom:13px}.unit-picker-row select{padding:8px 12px}.unit-picker-row>span{font-size:10px}}
.download-button{display:inline-flex;align-items:center;gap:8px;padding:10px 12px;background:var(--soft);border-radius:10px;margin:6px 0 9px;color:var(--ink)}.download-button svg{width:17px;height:17px}.download-button.is-saved{color:var(--accent);background:var(--tint)}
@media(max-width:700px){.lesson-copy strong{font-size:14px}.lesson-copy small{font-size:11px}.lesson-number{font-size:11px}.pdf-controls .icon-button{width:44px;height:44px}}
.sheet-header-actions{display:flex;align-items:center;gap:5px}#pdf-read-mode{font-size:17px;font-weight:650}#pdf-read-mode[aria-pressed=true]{color:var(--accent);background:var(--tint)}.pdf-readable{background:#fff;color:#1c2535;padding:22px 20px;text-align:left;font-size:17px;line-height:1.75;white-space:pre-line;max-width:760px;margin:0 auto;overflow-wrap:break-word;box-shadow:0 2px 15px #0001}
body.sheet-open{overflow:hidden}.action-sheet{--sheet-limit:min(88dvh,calc(var(--dialog-height,100dvh) - 12px));max-height:var(--sheet-limit);margin-bottom:var(--keyboard-offset,0px)}.action-sheet .sheet-body{max-height:calc(var(--sheet-limit) - 74px - env(safe-area-inset-bottom))}.pdf-sheet{height:var(--dialog-height,100dvh)}

/* Glass surfaces over a quiet blue/white backdrop. */
:root{--glass:rgba(255,255,255,.72);--glass-edge:rgba(255,255,255,.92);--glass-shadow:0 8px 28px rgba(36,67,109,.09),inset 0 1px 0 var(--glass-edge);--glass-active:rgba(255,255,255,.85)}
:root[data-theme=dark]{--glass:rgba(20,33,55,.72);--glass-edge:rgba(170,199,240,.18);--glass-shadow:0 8px 32px rgba(0,0,0,.24),inset 0 1px 0 var(--glass-edge);--glass-active:rgba(115,163,229,.16)}
body{background:radial-gradient(ellipse at 10% 0%,rgba(117,165,232,.16),transparent 55%),radial-gradient(ellipse at 95% 60%,rgba(181,201,239,.14),transparent 55%),var(--bg);background-attachment:fixed;min-height:100dvh}
:root[data-theme=dark] body{background:radial-gradient(ellipse at 10% 0%,rgba(48,89,157,.25),transparent 60%),radial-gradient(ellipse at 100% 65%,rgba(38,63,112,.18),transparent 55%),var(--bg);background-attachment:fixed}
.app-header{background:transparent;border-bottom:0}
.app-nav,.continue-card,.shortcut,.progress-summary,.profile-choice,#audio-dock,.action-sheet,.sheet-header,.pdf-controls{background:var(--glass);-webkit-backdrop-filter:blur(24px) saturate(145%);backdrop-filter:blur(24px) saturate(145%);border:1px solid var(--glass-edge);box-shadow:var(--glass-shadow)}
.app-nav{border-radius:30px;padding:4px;top:10px}.app-nav button.active{background:var(--glass-active);box-shadow:inset 0 1px 0 var(--glass-edge)}
.level-tabs,.player-mode{background:var(--glass);border:1px solid var(--glass-edge);box-shadow:inset 0 1px 0 var(--glass-edge)}
.level-tabs button.active,.player-mode .active{background:var(--glass-active);box-shadow:0 2px 7px #0001,inset 0 1px 0 var(--glass-edge)}
.lesson-list,.unit{background:var(--glass);border-color:var(--line)}
.lesson-tools{border:1px solid var(--glass-edge);border-radius:20px;background:var(--glass);box-shadow:var(--glass-shadow);padding:7px 2px;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px)}
.main-play{background:linear-gradient(145deg,#4596fa,#1769e0);color:#fff;box-shadow:0 5px 18px rgba(23,105,224,.22),inset 0 1px 0 #ffffff65}
:root[data-theme=dark] .main-play{background:linear-gradient(145deg,#bdd9ff,#78abf5);color:#102340;box-shadow:0 5px 23px #0004,inset 0 1px 0 #ffffff80}
.track-art{border:1px solid #b3d5ff30;box-shadow:0 14px 36px #071b3c20,inset 0 1px 0 #ffffff25}
.download-button{border:1px solid var(--glass-edge);border-radius:20px;background:var(--glass);box-shadow:inset 0 1px 0 var(--glass-edge)}
.sheet-header{box-shadow:inset 0 1px 0 var(--glass-edge);border-width:0 0 1px}.pdf-controls{box-shadow:none;border-width:1px 0 0}.pdf-sheet{background:var(--surface)}
@media(max-width:700px){.app-nav{top:auto;left:12px;bottom:calc(10px + env(safe-area-inset-bottom));width:calc(100% - 24px);height:64px;padding:5px 8px;border:1px solid var(--glass-edge);border-radius:34px}.app-nav button{border-radius:26px;padding:6px 8px}.app-nav button.active{background:var(--glass-active);color:var(--accent)}.lesson-tools{padding-top:7px}.action-sheet{border-bottom:0}.pdf-sheet .sheet-header{background:var(--glass)}}
@media(max-height:720px) and (max-width:700px){.track-art{width:120px;height:120px;padding:15px}.audio-mode{min-height:120px}.track-art>strong{font-size:42px}.track-caption{margin-top:8px}.lesson-content{padding-bottom:9px}}

.tv-link{padding:10px;border-radius:12px;font-size:12px;text-align:center} .tv-link:focus-visible{outline:3px solid var(--accent)}

/* Lesson tools belong to the lesson header, separate from the main mobile nav. */
.home-content{max-width:706px}.continue-card,.home-shortcuts{margin-left:auto;margin-right:auto}
.lesson-tools{margin:0 0 14px;padding:0;justify-content:flex-end;gap:8px;border:0}
.lesson-tools button{flex-direction:row;min-height:44px;padding:8px 12px;font-size:12px;background:var(--glass);border:1px solid var(--glass-edge)}
.player-mode button{min-height:44px}.player-options{flex-wrap:wrap;gap:6px 12px}
.volume-control{display:flex;align-items:center;gap:6px}.volume-control button{width:38px;height:38px;background:var(--soft);border-radius:12px;font-size:22px}.volume-control input{width:88px;min-height:38px;accent-color:var(--accent)}
.hardware-volume{font-size:11px;color:var(--muted);flex-basis:100%;text-align:center}
.current-unit{border-color:var(--accent);background:var(--tint)}.unit.current-unit>summary{background:var(--tint);color:var(--accent)}
.unit-picker-wrap.current-unit{padding:14px;border:1px solid var(--accent);border-radius:14px}.current-lesson{background:var(--tint);box-shadow:inset 3px 0 var(--accent)}
@media(max-width:700px){.lesson-tools{margin:0 0 12px;justify-content:center;gap:6px}.lesson-tools button{flex:1;min-width:0;padding:7px 8px;font-size:11px;gap:5px}.lesson-tools svg{width:16px;height:16px}.player-mode{width:100%;margin-bottom:12px}.player-mode button{flex:1;padding:8px 14px}.player-options{justify-content:center}.unit-picker-wrap.current-unit{padding:12px}}
@media(display-mode:standalone){.app-header{height:calc(58px + env(safe-area-inset-top));padding-top:env(safe-area-inset-top)}}

/* Secondary tools live behind the ellipsis, speed belongs to the timeline. */
.lesson-actions [data-sheet="tools"] svg{stroke-width:4;stroke-linecap:round}
.lesson-menu{display:flex;flex-direction:column;gap:6px}.lesson-menu button{display:flex;align-items:center;gap:14px;width:100%;min-height:54px;padding:12px 14px;background:transparent;border-radius:12px;text-align:left;font-size:15px}.lesson-menu button:hover{background:var(--soft)}.lesson-menu button>span{flex:1}.lesson-menu svg{width:20px;height:20px;color:var(--muted)}.lesson-menu svg:last-child{width:16px}
.player-times{align-items:center;min-height:38px}.player-times select{width:78px;min-height:36px;min-width:0;padding:4px 6px;border:0;background:transparent;text-align:center;color:var(--muted);font-size:13px;border-radius:10px;cursor:pointer}.player-times select:hover{background:var(--soft)}
.player-options{flex-wrap:nowrap;justify-content:space-between;gap:8px}.volume-control{flex-shrink:0}.mode-switch{white-space:nowrap}
@media(max-width:700px){.player-times select{width:84px;padding:4px 2px}.volume-control input{width:64px}.player-options{justify-content:space-between}.lesson-actions .icon-button,.lesson-actions .favorite-button{width:38px;height:40px}.lesson-actions{gap:1px}.lesson-top>span{font-size:10px}.lesson-content{padding-top:5px}}

/* The document owns pinch zoom; playback stays available inside the reader. */
.pdf-canvas-wrap{touch-action:pan-x pan-y}.pdf-canvas-wrap canvas{max-width:none}.pdf-player-bar{display:flex;align-items:center;justify-content:center;gap:14px;flex-shrink:0;border-top:1px solid var(--line);background:var(--surface);padding:6px 12px}.pdf-play-toggle{display:grid;place-items:center;flex-shrink:0;width:42px;height:42px;border-radius:50%;background:var(--accent);color:var(--play-ink)}.pdf-play-toggle svg{width:21px;height:21px}.pdf-play-time{font-size:12px;color:var(--muted);font-variant-numeric:tabular-nums;min-width:91px;text-align:center}.lesson-actions .save-pending{color:#c68728}
@media(max-width:700px){.pdf-player-bar{gap:10px;padding:4px 10px}.pdf-player-bar .icon-button{width:40px;height:40px}.pdf-play-time{font-size:11px}}