:root{color-scheme:light;--bg:#f6f7f9;--surface:#fff;--soft:#eef1f6;--ink:#18202d;--muted:#697386;--line:#e1e5ed;--accent:#2563eb;--tint:#eaf0ff;--success:#227343;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:#11151b;--surface:#191f28;--soft:#222a36;--ink:#ecf0f7;--muted:#a0aabd;--line:#303948;--accent:#8cafff;--tint:#23334e;--success:#80c79a}@media(prefers-color-scheme:dark){:root:not([data-theme=light]){color-scheme:dark;--bg:#11151b;--surface:#191f28;--soft:#222a36;--ink:#ecf0f7;--muted:#a0aabd;--line:#303948;--accent:#8cafff;--tint:#23334e;--success:#80c79a}}
*{box-sizing:border-box}body{margin:0}body.has-audio{padding-bottom:180px}button,input,select,textarea{font:inherit;color:inherit}button{cursor:pointer;border:0}button:disabled{opacity:.5;cursor:default}[hidden]{display:none!important}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible,textarea:focus-visible{outline:3px solid var(--accent);outline-offset:3px}a{color:var(--accent)}h1,h2,h3,p{margin-top:0}h1{font-size:32px;line-height:1.2;letter-spacing:-1px;margin-bottom:0;font-weight:650}h2{font-size:21px;letter-spacing:-.5px;font-weight:650}h3{font-size:16px;font-weight:600;margin-bottom:10px}p{line-height:1.5}svg{width:19px;height:19px;flex-shrink:0}.muted{color:var(--muted);font-size:13px}.text-button{padding:9px 0;background:transparent;font-size:13px;font-weight:550;text-decoration:none;color:var(--muted)}.icon-button{display:flex;align-items:center;justify-content:center;background:transparent;border:1px solid var(--line);border-radius:9px;width:39px;height:39px;font-size:23px}.button{display:inline-flex;align-items:center;justify-content:center;gap:9px;padding:12px 17px;min-height:43px;border-radius:9px;font-size:13px;font-weight:600;text-decoration:none;white-space:nowrap}.primary{background:var(--accent);color:#fff}:root[data-theme=dark] .primary{color:#11151b}.outline{background:var(--surface);border:1px solid var(--line)}.completed{background:var(--tint);color:var(--success);border:1px solid var(--line)}button:hover{filter:brightness(.97)}.actions{display:flex;gap:10px;flex-wrap:wrap}.brand{display:flex;align-items:baseline;gap:9px;font-size:21px;font-weight:750;letter-spacing:-.8px;color:var(--ink)}.brand span{font-size:11px;font-weight:500;color:var(--muted);letter-spacing:0}.app-header{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:20px;height:75px;padding:0 max(28px,calc((100% - 1120px)/2));background:var(--surface);border-bottom:1px solid var(--line)}nav{display:flex;gap:6px}nav button{font-size:13px;padding:10px 16px;border-radius:8px;background:transparent;color:var(--muted)}nav button.active{background:var(--tint);color:var(--accent)}.header-actions{display:flex;align-items:center;gap:13px}.profile-button{display:flex;align-items:center;gap:8px;background:transparent;font-size:12px;padding:0}.avatar{display:flex;align-items:center;justify-content:center;border-radius:50%;width:67px;height:67px;background:var(--tint);color:var(--accent);font-size:25px;font-weight:650}.avatar.small{width:32px;height:32px;font-size:12px}.avatar.pink{background:#f5e7f0;color:#a64d7b}:root[data-theme=dark] .avatar.pink{background:#392838;color:#e3a0c4}.content{max-width:1120px;margin:auto;padding:38px 28px 60px}.page-heading{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-bottom:27px}.eyebrow{font-size:10px;letter-spacing:1.5px;color:var(--accent);font-weight:700}.breadcrumb{font-size:12px;color:var(--muted);margin-bottom:10px}.resume-card{border:1px solid var(--line);background:var(--surface);padding:29px 31px;border-radius:13px}.resume-card .breadcrumb{margin-top:18px}.resume-card h2{font-size:30px;letter-spacing:-.8px;margin-bottom:8px}.resume-card .muted{margin-bottom:23px}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:15px;margin:30px 0 15px}.section-heading h2{font-size:18px;margin:0}.level-cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}.level-card{border:1px solid var(--line);background:var(--surface);padding:22px;border-radius:11px;text-align:left}.level-card p{font-size:12px;color:var(--muted);margin-bottom:21px}.level-card small{display:block;color:var(--muted);font-size:11px;margin-top:10px}.meter{height:4px;background:var(--soft);border-radius:5px;overflow:hidden}.meter i{height:100%;width:0;display:block;background:var(--accent);border-radius:5px}.lesson-list{border:1px solid var(--line);border-radius:11px;overflow:hidden;background:var(--surface)}.lesson-row{display:flex;width:100%;align-items:center;gap:20px;padding:18px 23px;border-bottom:1px solid var(--line);background:transparent;text-align:left}.lesson-row:last-child{border-bottom:0}.lesson-row:hover{background:var(--soft)}.lesson-number{min-width:34px;font-size:12px;color:var(--muted);font-variant-numeric:tabular-nums}.lesson-copy{flex:1}.lesson-copy strong{font-size:14px;font-weight:550}.lesson-copy small{display:block;margin-top:5px;font-size:11px;color:var(--muted)}.lesson-state{font-size:11px;color:var(--accent)}.lesson-state svg{width:17px;height:17px}.level-tabs,.resource-tabs{display:flex;gap:5px;padding:5px;border:1px solid var(--line);background:var(--soft);border-radius:10px;width:fit-content;margin-bottom:20px}.level-tabs button,.resource-tabs button{padding:10px 18px;border-radius:7px;background:transparent;font-size:13px;color:var(--muted);white-space:nowrap}.level-tabs button.active,.resource-tabs button.active{background:var(--surface);color:var(--ink)}.course-tools{display:flex;gap:12px;margin-bottom:22px}input,select,textarea{background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:12px;font-size:13px}#search{flex:1;min-width:0}select{font-size:12px}.unit{background:var(--surface);border:1px solid var(--line);border-radius:11px;overflow:hidden;margin-bottom:13px}.unit summary{display:flex;align-items:center;justify-content:space-between;padding:21px 23px;cursor:pointer;list-style:none;font-size:14px}.unit summary::-webkit-details-marker{display:none}.unit summary>span{color:var(--muted);font-size:11px}.chevron{font-size:16px;margin-left:23px}.unit .lesson-list{border:0;border-top:1px solid var(--line);border-radius:0}.empty{padding:30px;font-size:13px;color:var(--muted)}.lesson-heading{margin-top:14px}.lesson-heading .breadcrumb{margin-bottom:8px}.study-grid{display:grid;grid-template-columns:minmax(0,1fr) 245px;gap:25px}.resource-tabs button{padding:10px 15px;font-size:12px}video{width:100%;aspect-ratio:16/9;background:#000;border-radius:11px;display:block}.play-controls{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-top:7px}.play-controls select{padding:7px 10px;font-size:11px}.player-footer{margin:11px 0 22px;color:var(--muted);font-size:10px}.notes-card{border:1px solid var(--line);border-radius:10px;background:var(--surface);padding:17px}.notes-card summary{font-size:13px;font-weight:550;cursor:pointer}.notes-card textarea{width:100%;resize:vertical;min-height:130px;margin-top:17px;line-height:1.6;background:var(--bg)}.lesson-nav{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-top:20px}.study-aside{height:fit-content;background:var(--surface);border:1px solid var(--line);border-radius:11px;padding:19px}.study-aside h3{font-size:13px;color:var(--muted);margin-bottom:18px}.compact-lesson{display:flex;align-items:center;gap:12px;width:100%;background:transparent;border-radius:7px;text-align:left;padding:13px 9px;margin-top:3px}.compact-lesson span{font-size:11px;min-width:29px;color:var(--muted)}.compact-lesson strong{font-size:12px;font-weight:500}.compact-lesson.current{background:var(--tint);color:var(--accent)}.listen-panel{display:flex;align-items:center;flex-direction:column;text-align:center;justify-content:center;background:var(--surface);border:1px solid var(--line);padding:40px 20px;border-radius:11px;min-height:265px}.listen-panel>svg{width:43px;height:43px;color:var(--accent);margin-bottom:19px}.listen-panel h2{margin-bottom:8px;font-size:23px}.listen-panel .muted{font-size:12px;margin-bottom:21px;max-width:100%;overflow-wrap:anywhere}.auto-next{font-size:11px;color:var(--muted);margin-top:22px;display:flex;gap:8px;align-items:center}.auto-next input{accent-color:var(--accent);width:16px;height:16px;padding:0}.listen-panel>small{margin-top:15px}#asset-select{width:100%;margin-bottom:15px}.pdf-toolbar{display:flex;justify-content:flex-end;margin-bottom:10px}.pdf-controls{display:flex;align-items:center;gap:12px;padding:12px;background:var(--soft);border:1px solid var(--line);border-radius:10px 10px 0 0;font-size:12px}.pdf-controls .button{padding:7px 12px;min-height:34px}.pdf-controls input{width:47px;padding:7px;font-size:12px}.pdf-controls select{margin-left:auto;padding:8px;font-size:11px;max-width:150px}.pdf-canvas-wrap{background:var(--soft);border:1px solid var(--line);border-top:0;border-radius:0 0 10px 10px;padding:16px;overflow:auto;max-height:850px;min-height:180px}.pdf-canvas-wrap canvas{display:block;background:white;box-shadow:0 2px 15px #0001}.pdf-canvas-wrap #pdf-loading{text-align:center;font-size:12px;margin:25px 0}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.progress-summary{background:var(--surface);border:1px solid var(--line);border-radius:11px;padding:26px;margin-bottom:24px}.progress-summary strong{font-size:40px;font-weight:650;letter-spacing:-1.5px;display:block;margin-bottom:8px}.progress-summary .meter{margin-top:22px}.profile-screen{max-width:1000px;margin:auto;padding:30px}.profile-top{display:flex;justify-content:space-between;align-items:center}.profile-panel{max-width:430px;margin:120px auto 0;text-align:center}.profile-panel h1{font-size:29px;margin-bottom:33px}.profiles{display:grid;grid-template-columns:1fr 1fr;gap:18px}.profile-choice{background:var(--surface);border:1px solid var(--line);border-radius:12px;display:flex;flex-direction:column;align-items:center;padding:30px 18px;gap:18px}.profile-choice strong{font-size:15px;font-weight:550}#login-error{font-size:12px;color:#bc5f58;min-height:18px;margin-top:20px}#audio-dock{position:fixed;z-index:30;bottom:15px;left:50%;transform:translateX(-50%);width:min(650px,calc(100% - 32px));background:var(--surface);border:1px solid var(--line);border-radius:13px;padding:13px 18px 9px;box-shadow:0 5px 35px #0002}.dock-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:6px}.dock-heading .text-button{font-size:12px;color:var(--ink);overflow:hidden;white-space:nowrap;text-overflow:ellipsis;text-align:left}.dock-heading .icon-button{width:26px;height:26px;border:0;font-size:21px;flex-shrink:0}#listen-player{display:block;width:100%;height:42px}.dock-controls{display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:10px;color:var(--muted)}.dock-controls .text-button{font-size:11px;padding:10px 0}.dock-controls select{font-size:10px;padding:5px;border:0;background:transparent;margin-left:4px}#toast{position:fixed;z-index:100;left:50%;bottom:24px;transform:translateX(-50%);background:var(--ink);color:var(--bg);border-radius:9px;padding:13px 18px;font-size:12px;opacity:0;pointer-events:none;max-width:90vw}#toast.visible{opacity:1}.has-audio #toast{bottom:185px}
@media(max-width:900px){.app-header{padding:0 24px}.content{padding:30px 24px 50px}.study-grid{grid-template-columns:minmax(0,1fr) 205px;gap:20px}.study-aside{padding:14px}.resource-tabs button{padding:10px 11px}.profile-button>span:last-child{display:none}}
@media(max-width:650px){.app-header{height:auto;min-height:65px;padding:14px 19px;gap:10px;flex-wrap:wrap}.brand{font-size:20px}.header-actions{margin-left:auto;gap:10px}nav{order:3;width:100%;justify-content:space-between;margin-top:7px;gap:8px}nav button{flex:1;font-size:12px;padding:10px 8px}.content{padding:28px 18px 40px}h1{font-size:27px}.page-heading{margin-bottom:23px;gap:12px}.page-heading>.muted{font-size:10px}.resume-card{padding:24px}.resume-card h2{font-size:27px}.resume-card .breadcrumb{font-size:11px;line-height:1.6}.button{font-size:12px;padding:11px 15px}.level-cards{gap:9px}.level-card{padding:16px 12px}.level-card h3{font-size:13px}.level-card p{font-size:10px}.level-card small{font-size:10px}.section-heading{margin-top:27px}.section-heading h2{font-size:17px}.lesson-row{padding:16px;gap:14px}.lesson-copy strong{font-size:13px}.lesson-copy small{font-size:10px}.lesson-number{min-width:30px;font-size:11px}.level-tabs{width:100%;gap:4px}.level-tabs button{flex:1;font-size:11px;padding:10px 8px}.course-tools{gap:8px}.course-tools input{font-size:12px}.course-tools select{font-size:11px;max-width:130px}.unit summary{padding:19px 17px}.study-grid{display:block}.study-aside{margin-top:25px;padding:19px}.lesson-heading .button{font-size:11px;padding:10px 12px}.resource-tabs{width:100%;gap:3px}.resource-tabs button{flex:1;padding:10px 6px;font-size:11px}.pdf-controls{gap:9px;padding:10px;font-size:10px}.pdf-controls select{font-size:10px;max-width:123px}.pdf-controls input{width:42px;font-size:11px}.pdf-controls .button{padding:6px 11px}.pdf-canvas-wrap{max-height:650px}.profile-screen{padding:23px}.profile-panel{margin-top:90px}.profile-panel h1{font-size:26px}.profiles{gap:14px}.profile-choice{padding:27px 15px}.avatar{width:60px;height:60px;font-size:22px}#audio-dock{bottom:8px;width:calc(100% - 20px);padding:10px 12px 5px;border-radius:11px}.dock-controls{gap:9px}.dock-controls .text-button{font-size:10px}.dock-controls label{font-size:9px}.dock-controls select{margin-left:0;padding:3px}.dock-heading .text-button{font-size:11px}body.has-audio{padding-bottom:165px}.has-audio #toast{bottom:170px}}
@media(max-width:370px){.level-cards{grid-template-columns:1fr}.level-card{padding:19px}.level-card h3{font-size:15px}.pdf-controls{gap:6px}.pdf-controls select{max-width:104px;padding:7px}.actions .button{padding:11px 13px}}

/* Custom controls share the persistent native audio element. */
.lesson-note{display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;width:27px;height:27px;border-radius:7px;background:var(--tint);color:var(--accent)}.lesson-note svg{width:16px;height:16px}.compact-lesson strong{flex:1;min-width:0}.compact-lesson .lesson-note{min-width:25px;width:25px;height:25px}.lesson-state{flex-shrink:0}
.unit summary{gap:16px}.unit summary strong{min-width:0;line-height:1.45}.unit summary>span{flex-shrink:0}.lesson-copy{min-width:0}.lesson-copy strong,.compact-lesson strong{line-height:1.45;overflow-wrap:anywhere}.breadcrumb{line-height:1.6}.lesson-heading>div{min-width:0}.lesson-heading h1{overflow-wrap:anywhere}.study-aside h3{line-height:1.5}.compact-lesson span{flex-shrink:0}
#listen-player{display:none}
.music-player{padding:30px clamp(22px,6vw,64px);border-radius:20px;background:linear-gradient(155deg,var(--tint),var(--surface) 55%);text-align:left;gap:0}
.audio-cover{width:min(100%,300px);aspect-ratio:1;border-radius:18px;padding:25px;background:linear-gradient(140deg,#1c5c72,#18354d 65%,#232c49);color:#d8f8ef;box-shadow:0 14px 32px #102d4525;display:flex;flex-direction:column;justify-content:space-between;overflow:hidden;position:relative}
.audio-cover:before{content:"";position:absolute;width:230px;height:230px;right:-95px;top:40px;border-radius:50%;border:1px solid #d8f8ef20;box-shadow:0 0 0 24px #d8f8ef08,0 0 0 48px #d8f8ef05;pointer-events:none}
.cover-top,.cover-bottom{display:flex;align-items:center;justify-content:space-between;gap:16px;position:relative}.cover-top span,.cover-bottom>span{font-size:10px;font-weight:650;letter-spacing:1.8px}.cover-top svg{width:24px;height:24px}.audio-cover>strong{font-size:clamp(55px,10vw,84px);letter-spacing:-4px;font-weight:650;line-height:1;position:relative}.cover-wave{display:flex;gap:4px;align-items:center;height:60px}.cover-wave i{width:3px;border-radius:5px;background:#b8e7d6;opacity:.7}
.audio-title{width:100%;margin-top:26px}.music-player .audio-title h2{font-size:25px;line-height:1.25;letter-spacing:-.6px;margin:0 0 8px}.audio-title p{font-size:12px;color:var(--muted);margin:0 0 22px}.audio-timeline{width:100%}.audio-times{display:flex;justify-content:space-between;font-size:11px;font-variant-numeric:tabular-nums;color:var(--muted);margin-top:5px}
[data-audio-seek]{display:block;width:100%;height:26px;margin:0;padding:0;border:0;appearance:none;-webkit-appearance:none;background:transparent;cursor:pointer;border-radius:0;touch-action:pan-y}
[data-audio-seek]::-webkit-slider-runnable-track{height:5px;border-radius:5px;background:linear-gradient(to right,var(--accent) 0 var(--played,0%),var(--line) var(--played,0%) 100%)}
[data-audio-seek]::-webkit-slider-thumb{appearance:none;-webkit-appearance:none;width:15px;height:15px;border-radius:50%;background:var(--accent);margin-top:-5px;box-shadow:0 0 0 4px var(--surface)}
[data-audio-seek]::-moz-range-track{height:5px;border-radius:5px;background:var(--line)}[data-audio-seek]::-moz-range-progress{height:5px;background:var(--accent)}[data-audio-seek]::-moz-range-thumb{width:15px;height:15px;border:0;border-radius:50%;background:var(--accent)}
.audio-main-controls{display:flex;align-items:center;justify-content:center;gap:38px;width:100%;margin:22px 0 16px}.audio-play{width:72px;height:72px;border-radius:50%;background:var(--ink);color:var(--bg);display:flex;align-items:center;justify-content:center;flex-shrink:0;box-shadow:0 5px 14px #0001}.audio-play svg{width:30px;height:30px}.audio-skip{width:52px;height:52px;position:relative;background:transparent;color:var(--ink);display:grid;place-items:center}.audio-skip>span{font-size:43px;line-height:1;font-family:Arial,sans-serif}.audio-skip small{position:absolute;top:25px;font-size:10px;font-weight:700}.audio-options{display:flex;width:100%;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);padding-bottom:15px}.audio-options select{min-height:42px;padding:8px 12px;background:transparent}.audio-options .text-button{display:flex;align-items:center;gap:9px;min-height:44px;color:var(--ink)}.music-player .auto-next{margin-top:18px;align-self:flex-start;font-size:12px;min-height:26px}.music-player>small{align-self:flex-start;font-size:11px}
#audio-dock{padding:14px 18px 8px;border-radius:16px;bottom:calc(12px + env(safe-area-inset-bottom))}.dock-heading{margin:0 0 2px}.dock-heading #dock-track{flex:1;min-width:0;font-size:13px}.dock-art{width:42px;height:42px;border-radius:9px;background:linear-gradient(135deg,#1c5c72,#232c49);color:#d8f8ef;display:grid;place-items:center;font-size:23px;flex-shrink:0}.dock-heading .audio-play{width:44px;height:44px;box-shadow:none}.dock-heading .audio-play svg{width:22px;height:22px}.dock-heading .icon-button{width:32px;height:40px}.dock-controls{font-size:11px}.dock-controls select{min-height:36px;font-size:12px;padding:5px 9px}.dock-controls .text-button{min-height:40px;font-size:12px}.dock-controls .text-button:last-child{margin-left:auto}
body.has-audio{padding-bottom:205px}.has-audio #toast{bottom:210px}
@media(max-width:650px){.music-player{padding:24px 23px;border-radius:16px}.audio-cover{width:min(100%,270px)}.music-player .audio-title h2{font-size:23px}.audio-main-controls{gap:30px}.audio-play{width:76px;height:76px}#audio-dock{width:calc(100% - 20px);padding:12px 13px 5px}.dock-heading #dock-track{font-size:12px}.dock-controls{gap:8px}.dock-controls .text-button{font-size:11px}body.has-audio{padding-bottom:210px}}
.pdf-match{display:flex;flex-direction:column;align-items:flex-start;gap:7px;width:calc(100% - 44px);margin:0 22px 16px;padding:12px 16px;border:1px solid var(--line);border-radius:10px;background:var(--bg);color:var(--muted);text-align:left;font-size:13px;line-height:1.6}.pdf-match:hover{border-color:var(--accent)}.pdf-match small{color:var(--accent);font-weight:600}.search-count{font-size:13px;color:var(--muted);margin:0 0 16px}@media(max-width:650px){.pdf-match{width:calc(100% - 24px);margin:0 12px 12px;padding:12px;font-size:12px}}
.pdf-match mark{background:var(--tint);color:var(--ink);font-weight:650;border-radius:3px;padding:0 2px}
/* Safari on iPhone zooms focused text fields when their font is below 16px. */
@media(max-width:900px),(hover:none) and (pointer:coarse){#search{font-size:16px}}
.lesson-entry{display:flex;align-items:center;border-bottom:1px solid var(--line);padding-right:12px}.lesson-entry:last-child{border-bottom:0}.lesson-entry .lesson-row{flex:1;min-width:0;border:0;padding-right:12px}.favorite-button{display:grid;place-items:center;width:44px;height:44px;flex-shrink:0;background:transparent;color:var(--muted);border-radius:9px}.favorite-button.selected{color:var(--accent);background:var(--tint)}.favorite-button:hover{background:var(--soft)}.lesson-actions{display:flex;align-items:center;gap:10px}.timed-note{display:flex;align-items:flex-start;gap:12px;padding:12px 0;border-top:1px solid var(--line);font-size:13px}.timed-note>span{flex:1;white-space:pre-wrap;overflow-wrap:anywhere}.timestamp{color:var(--accent);background:var(--tint);padding:7px 9px;border-radius:7px;font-size:12px;white-space:nowrap}.timed-note .text-button{padding:4px 10px;font-size:20px}.timed-compose{margin-top:12px}#timed-draft{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:10px}#timed-label{width:100%;font-size:12px;color:var(--muted)}#timed-text{flex:1;min-width:140px;font-size:16px;padding:12px;border:1px solid var(--line);border-radius:9px;background:var(--bg)}.download-audio{width:100%;margin-top:16px}.download-audio a{display:block;color:var(--accent);min-height:44px}.download-audio small{display:block;font-size:11px;line-height:1.5}@media(max-width:650px){.lesson-actions{gap:5px}.lesson-entry{padding-right:5px}.lesson-entry .lesson-row{gap:12px;padding-right:6px}.lesson-actions .button{padding:10px}.lesson-heading{flex-wrap:wrap}.timed-note{gap:8px}}
.offline-status{font-size:11px;background:var(--tint);color:var(--accent);padding:7px 9px;border-radius:7px}.download-audio button{color:var(--accent);min-height:44px}@media(max-width:650px){.offline-status{font-size:10px;padding:5px}}