/* Layout: chart-desk header with a candle per section, then a single study column of section ledgers */
:root{
  --bg:#f3f5f4; --surface:#ffffff; --line:#d9e0dd; --ink:#16201d; --muted:#5d6b66;
  --bull:#14806a; --bull-soft:#d7eee7; --bear:#c2453b; --wick:#9aa7a2; --accent:#1f5f8b; --accent-soft:#e2edf5;
  --display:"Archivo","Arial Narrow",system-ui,sans-serif;
  --body:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,Menlo,Consolas,monospace;
  color-scheme:light;
}
@media (prefers-color-scheme: dark){:root{
  --bg:#0f1513; --surface:#161e1b; --line:#26322e; --ink:#e4ebe8; --muted:#93a39d;
  --bull:#35b896; --bull-soft:#173a31; --bear:#e06b60; --wick:#4c5a55; --accent:#6aa9d6; --accent-soft:#16283a; color-scheme:dark}}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.55 var(--body);padding:0 16px;padding-bottom:env(safe-area-inset-bottom,0px)}
a{color:var(--accent)}
.muted{color:var(--muted)} .small{font-size:13px}
.eyebrow{font:500 11px/1.3 var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
h1{font:800 clamp(28px,5.5vw,44px)/1.02 var(--display);font-stretch:80%;letter-spacing:-.01em;margin:6px 0 8px;text-wrap:balance}
h2{font:700 22px/1.1 var(--display);font-stretch:85%;margin:0}
.wrap{max-width:900px;margin:0 auto;padding-block:24px 96px;display:flex;flex-direction:column;gap:22px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:18px}

/* top bar */
.topbar{max-width:900px;margin:0 auto;display:flex;justify-content:space-between;align-items:center;padding-block:14px;border-bottom:1px solid var(--line);gap:12px}
.brand{display:flex;align-items:center;gap:10px;font:700 17px/1 var(--display);font-stretch:85%;color:var(--ink);text-decoration:none}
.brand-mark{width:14px;height:22px;position:relative;display:inline-block}
.brand-mark::before{content:"";position:absolute;left:6px;top:0;bottom:0;width:2px;background:var(--wick)}
.brand-mark::after{content:"";position:absolute;left:1px;top:5px;width:12px;height:12px;background:var(--bull);border-radius:2px}
.brand-mark.big{transform:scale(1.6);transform-origin:left top;margin-bottom:18px}
.topnav{display:flex;gap:16px;font-size:14px}
.topnav a{color:var(--muted);text-decoration:none}.topnav a:hover{color:var(--ink)}

/* buttons and inputs */
.btn{font:500 13px/1 var(--body);color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:6px;padding:10px 13px;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;gap:6px;white-space:nowrap}
.btn:hover{border-color:var(--muted)}
.btn.primary{background:var(--bull);border-color:var(--bull);color:var(--surface)}
.btn.primary:hover{filter:brightness(1.07)}
.btn.danger{color:var(--bear)}
.btn.small{padding:6px 9px;font-size:12px}
.btn.wide{width:100%;justify-content:center;padding:12px}
.btn[aria-pressed="true"]{background:var(--accent-soft);border-color:var(--accent);color:var(--accent)}
.btn:disabled{opacity:.6;cursor:wait}
input[type=text],input[type=url],input[type=password],input[type=number],input[type=date],select,textarea{
  font:400 15px/1.4 var(--body);color:var(--ink);background:var(--bg);border:1px solid var(--line);border-radius:6px;padding:10px 12px;width:100%;min-width:0}
textarea{font:400 13px/1.5 var(--mono);resize:vertical}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
label{font:500 12px/1.3 var(--mono);text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.error{color:var(--bear);font-size:14px;margin:0}

/* auth */
.auth{min-height:100vh;display:grid;place-items:center;padding-block:32px}
.auth-card{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:28px;width:100%;max-width:380px;display:flex;flex-direction:column;gap:10px}
.auth-card h1{font-size:32px;margin:0}
.auth-card p{margin:0 0 6px}

/* dashboard */
.add h1{font-size:clamp(26px,4.6vw,36px)}
.add p{margin:0 0 14px;max-width:62ch}
.addform{display:flex;flex-direction:column;gap:12px}
.row{display:flex;gap:8px;flex-wrap:wrap}
.row input{flex:1 1 280px}
details summary{cursor:pointer;font-size:14px;color:var(--accent);width:max-content}
.paste{display:flex;flex-direction:column;gap:8px;margin-top:12px}
.preview{font-size:13px;color:var(--muted)}
.preview ol{margin:6px 0 0;padding-left:22px;columns:2 260px;column-gap:24px}
.preview li{break-inside:avoid}
.list-head{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:12px}
.courses{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:12px}
.ccard{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:16px;display:flex;flex-direction:column;gap:10px;color:var(--ink);text-decoration:none;min-width:0}
.ccard:hover{border-color:var(--muted)}
.ccard.archived{opacity:.6}
.ccard h3{font:700 18px/1.15 var(--display);font-stretch:88%;margin:0;text-wrap:balance}
.ccard .src{font:500 11px/1 var(--mono);text-transform:uppercase;letter-spacing:.1em;color:var(--muted)}
.ccard .nums{display:flex;justify-content:space-between;font:400 12px/1.3 var(--mono);color:var(--muted);font-variant-numeric:tabular-nums;gap:8px;flex-wrap:wrap}
.ccard .nums b{color:var(--ink);font-weight:500}
.ccard.live{border-color:var(--bull)}
.empty{grid-column:1/-1;border:1px dashed var(--line);border-radius:10px;padding:28px;text-align:center;color:var(--muted)}

/* course desk */
.chead .clinks{display:flex;gap:16px;font-size:14px;flex-wrap:wrap}
.desk{display:flex;flex-direction:column;gap:16px}
.stats{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:14px}
.stat b{display:block;font:700 26px/1 var(--display);font-stretch:85%;font-variant-numeric:tabular-nums;white-space:nowrap}
.stat span{font:500 10.5px/1.4 var(--mono);text-transform:uppercase;letter-spacing:.08em;color:var(--muted)}
.stat.big b{font-size:40px;color:var(--bull)}
.bar{height:6px;background:var(--line);border-radius:3px;overflow:hidden}
.bar i{display:block;height:100%;background:var(--bull);width:0;transition:width .4s ease}
.charts{display:grid;grid-template-columns:3fr 2fr;gap:20px}
.chartbox{min-width:0}
.chart-label{font:500 11px/1 var(--mono);text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin-bottom:8px}
.chart,.days{display:grid;gap:3px;align-items:end;height:92px;border-bottom:1px dashed var(--line)}
.candle{position:relative;height:100%;display:flex;justify-content:center;align-items:flex-end;cursor:pointer;background:none;border:0;padding:0}
.candle::before{content:"";position:absolute;left:50%;top:4px;bottom:0;width:1px;background:var(--wick)}
.candle .body{position:relative;width:min(14px,72%);background:var(--bull);border-radius:2px;min-height:3px;transition:height .4s ease}
.candle.zero .body{background:var(--bear);height:3px!important}
.candle:hover .body,.candle:focus-visible .body{outline:2px solid var(--accent);outline-offset:1px}
.day{height:100%;display:flex;align-items:flex-end;justify-content:center}
.day i{display:block;width:72%;background:var(--accent);border-radius:2px 2px 0 0;min-height:2px;opacity:.85}
.day.today i{opacity:1;background:var(--bull)}
.day.zero i{background:var(--line)}
.axis{display:grid;gap:3px;font:400 10px/1.6 var(--mono);color:var(--muted);text-align:center;font-variant-numeric:tabular-nums}
.axis span{overflow:hidden;white-space:nowrap}
.insights{display:flex;flex-wrap:wrap;gap:8px 22px;font-size:14px;color:var(--muted)}
.insights strong{color:var(--ink);font-weight:600}
.insights .warn strong{color:var(--bear)}
.insights .good strong{color:var(--bull)}
.tools{display:flex;flex-wrap:wrap;gap:8px}
.panel{border-top:1px solid var(--line);padding-top:14px;display:flex;flex-direction:column;gap:12px}
.panel-row{display:flex;flex-wrap:wrap;gap:8px 10px;align-items:center}
.panel-row input,.panel-row select{width:auto;flex:1 1 160px}
.panel-row input[type=number]{flex:0 1 100px}
.danger-zone{padding-top:4px}
.confirm{display:inline-flex;flex-wrap:wrap;gap:8px;align-items:center;font-size:13px;color:var(--bear)}
.toast{font:400 12px/1 var(--mono);color:var(--bull)}

/* sections */
.sections{display:flex;flex-direction:column;gap:12px}
.section{background:var(--surface);border:1px solid var(--line);border-radius:10px;overflow:hidden;scroll-margin-top:72px}
.section.done{border-color:var(--bull)}
.shead{display:flex;align-items:center;gap:12px;padding:14px 16px;cursor:pointer;user-select:none}
.num{font:500 12px/1 var(--mono);color:var(--muted);width:24px;flex:none;font-variant-numeric:tabular-nums}
.stitle{flex:1;min-width:0;font:700 18px/1.2 var(--display);font-stretch:88%}
.smeta{font:400 12px/1.3 var(--mono);color:var(--muted);font-variant-numeric:tabular-nums;text-align:right;white-space:nowrap}
.section.done .smeta .cnt{color:var(--bull)}
.chev{width:10px;height:10px;border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);transform:rotate(45deg);transition:transform .2s;margin:0 4px 4px;flex:none}
.section.closed .chev{transform:rotate(-45deg);margin-bottom:0}
.smini{height:3px;background:var(--line)} .smini i{display:block;height:100%;background:var(--bull);width:0;transition:width .3s}
.lectures{list-style:none;margin:0;padding:4px 0}
.section.closed .lectures,.section.closed .sfoot{display:none}
.lec{display:flex;align-items:center;gap:12px;padding:8px 12px 8px 52px}
.lec:hover{background:var(--bg)}
.lec.studying{background:var(--bull-soft)}
.lec label.lt{flex:1;min-width:0;display:flex;align-items:center;gap:12px;cursor:pointer;font:400 15px/1.4 var(--body);text-transform:none;letter-spacing:0;color:var(--ink)}
.hide-done .lec.on{display:none}
.hide-done .section.done{display:none}
input[type=checkbox]{appearance:none;width:18px;height:18px;flex:none;border:1.5px solid var(--wick);border-radius:4px;display:grid;place-content:center;margin:0;cursor:pointer;background:var(--surface)}
input[type=checkbox]:checked{background:var(--bull);border-color:var(--bull)}
input[type=checkbox]:checked::after{content:"";width:5px;height:9px;border:solid var(--surface);border-width:0 2px 2px 0;transform:rotate(45deg) translate(-1px,-1px)}
.lec.on .ltext{color:var(--muted);text-decoration:line-through;text-decoration-color:var(--wick)}
.kind{font:500 10px/1 var(--mono);text-transform:uppercase;letter-spacing:.08em;color:var(--accent);border:1px solid var(--accent);border-radius:3px;padding:2px 4px;margin-left:6px;vertical-align:2px}
.lmeta{font:400 12px/1.3 var(--mono);color:var(--muted);font-variant-numeric:tabular-nums;white-space:nowrap;text-align:right}
.lmeta .sp{color:var(--accent)}
.play{width:30px;height:30px;flex:none;border-radius:50%;border:1px solid var(--line);background:var(--surface);cursor:pointer;display:grid;place-items:center;padding:0;color:var(--muted)}
.play:hover{border-color:var(--bull);color:var(--bull)}
.play svg{width:12px;height:12px;fill:currentColor}
.lec.studying .play{background:var(--bull);border-color:var(--bull);color:var(--surface)}
.notebtn{background:none;border:0;color:var(--muted);cursor:pointer;font:400 12px/1 var(--mono);padding:4px}
.notebtn.has{color:var(--accent)}
.note{padding:0 16px 10px 82px}
.note textarea{font:400 13px/1.5 var(--body);min-height:60px}
.sfoot{display:flex;justify-content:flex-end;padding:4px 16px 14px}

/* timer bar */
.timerbar{position:fixed;left:0;right:0;bottom:0;z-index:20;background:var(--ink);color:var(--bg);display:flex;align-items:center;gap:14px;padding:12px 16px;padding-bottom:calc(12px + env(safe-area-inset-bottom,0px))}
.timerbar .btn{background:transparent;color:var(--bg);border-color:var(--muted)}
.tb-text{flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:14px}
.tb-label{font:500 11px/1 var(--mono);text-transform:uppercase;letter-spacing:.1em;opacity:.7}
.tb-clock{font:500 18px/1 var(--mono);font-variant-numeric:tabular-nums}
.pulse{width:9px;height:9px;border-radius:50%;background:var(--bull);flex:none;animation:pulse 1.6s ease-in-out infinite}
@keyframes pulse{50%{opacity:.35}}

@media (max-width:760px){
  .stats{grid-template-columns:repeat(3,minmax(0,1fr))}
  .charts{grid-template-columns:1fr}
}
@media (max-width:520px){
  .lec{padding-left:12px;gap:8px}
  .note{padding-left:16px}
  .stat b{font-size:22px}.stat.big b{font-size:32px}
  .lmeta .dur{display:none}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

/* bookmarklet */
.bm{display:flex;gap:14px;align-items:center;justify-content:space-between;flex-wrap:wrap;border:1px dashed var(--line);border-radius:8px;padding:12px 14px;background:var(--bg)}
.bm-text{display:flex;flex-direction:column;gap:2px;flex:1 1 320px;min-width:0}
.bm-btn{cursor:grab;border-color:var(--bull);color:var(--bull);font-weight:600}
.bm-btn .brand-mark{transform:scale(.75)}
.bm-hint{margin:0}