:root{
  --paper:#f6f3ec; --card:#fffdf8; --ink:#1b1a17; --ink-2:#4a463e; --muted:#7a746a;
  --rule:rgba(27,26,23,.14); --rule-2:rgba(27,26,23,.07);
  --accent:#2747d4; --accent-ink:#fff; --warn:#c2412d; --ok:#2f7a4b;
  --serif:ui-serif,"New York","Iowan Old Style","Palatino Linotype",Georgia,serif;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --r:10px;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --paper:#151412; --card:#1d1c19; --ink:#ede8dd; --ink-2:#c9c3b6; --muted:#958e81;
    --rule:rgba(237,232,221,.16); --rule-2:rgba(237,232,221,.08);
    --accent:#7d95ff; --accent-ink:#0f1330; --warn:#ff8a73; --ok:#7fd19b;
    color-scheme:dark;
  }
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%;overflow-x:clip}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.5 var(--sans);-webkit-font-smoothing:antialiased;overflow-x:clip;-webkit-tap-highlight-color:transparent}
a{color:var(--accent)}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:-999px;top:8px;background:var(--ink);color:var(--paper);padding:8px 12px;border-radius:6px;z-index:99}
.skip:focus{left:12px}
.wrap{max-width:1120px;margin:0 auto;padding:0 32px}

/* top bar */
.top{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--paper) 90%,transparent);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--rule)}
.top-row{display:flex;align-items:center;justify-content:space-between;gap:16px;height:64px;position:relative;padding-top:env(safe-area-inset-top)}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none}
.brand-mark{width:26px;height:26px;border-radius:6px;background:var(--ink);background-image:linear-gradient(var(--paper),var(--paper)),linear-gradient(var(--paper),var(--paper)),linear-gradient(var(--paper),var(--paper));background-size:14px 2px,14px 2px,9px 2px;background-position:6px 8px,6px 12px,6px 16px;background-repeat:no-repeat}
.brand-name{font-family:var(--serif);font-size:21px;font-weight:600;letter-spacing:-.01em}
.top-actions{display:flex;gap:8px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:44px;padding:0 16px;border-radius:999px;border:1px solid transparent;font-weight:600;font-size:15px;white-space:nowrap;transition:background-color .15s ease,border-color .15s ease,transform .1s ease}
.btn:active{transform:scale(.97)}
.btn-primary{background:var(--ink);color:var(--paper)}
.btn-primary:hover{background:var(--accent);color:var(--accent-ink)}
.btn-ghost{background:transparent;border-color:var(--rule);color:var(--ink)}
.btn-ghost:hover{border-color:var(--ink-2)}
.btn-danger-ghost{background:transparent;color:var(--warn);padding:0 8px}
.link-btn{background:none;border:0;color:var(--accent);font-weight:600;padding:8px 4px;min-height:36px}
.menu{position:absolute;right:32px;top:60px;background:var(--card);border:1px solid var(--rule);border-radius:12px;padding:6px;min-width:280px;box-shadow:0 12px 32px rgba(0,0,0,.12)}
.menu button{display:block;width:100%;text-align:left;background:none;border:0;padding:11px 12px;border-radius:8px;font-size:15px}
.menu button:hover,.menu button:focus-visible{background:var(--rule-2)}
.menu hr{border:0;border-top:1px solid var(--rule);margin:6px 0}
.menu .danger{color:var(--warn)}

/* intro */
.intro{padding:44px 0 20px}
.intro h1{font-family:var(--serif);font-weight:500;font-size:clamp(34px,5vw,54px);line-height:1.05;letter-spacing:-.025em;margin:0}
.intro-sub{margin:10px 0 0;color:var(--muted);font-size:17px}

/* stats: ruled ledger */
.stats{display:grid;grid-template-columns:repeat(4,1fr);border-top:2px solid var(--ink);border-bottom:1px solid var(--rule);margin-bottom:36px}
.stat{display:flex;flex-direction:column;align-items:flex-start;gap:2px;text-align:left;background:none;border:0;border-right:1px solid var(--rule);padding:18px 20px 18px 0;margin-left:20px}
.stat:first-child{margin-left:0}
.stat:last-child{border-right:0}
.stat-num{font-family:var(--serif);font-size:clamp(40px,5vw,60px);line-height:1;font-variant-numeric:tabular-nums;letter-spacing:-.03em}
.stat-label{font-size:13.5px;color:var(--muted);font-weight:600}
.stat.is-warn .stat-num{color:var(--warn)}
.stat:hover .stat-label{color:var(--ink)}

/* layout */
.layout{display:grid;grid-template-columns:240px 1fr;gap:48px;align-items:start;padding-bottom:64px}
.side-head{display:flex;align-items:baseline;justify-content:space-between;border-bottom:1px solid var(--rule);padding-bottom:6px}
.side-head h2{font-size:13px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:0;font-weight:700}
.class-list{list-style:none;margin:0;padding:0}
.class-list li{border-bottom:1px solid var(--rule-2)}
.class-btn{display:grid;grid-template-columns:12px 1fr auto;align-items:center;gap:10px;width:100%;background:none;border:0;padding:11px 4px;text-align:left;min-height:44px;border-radius:6px}
.class-btn:hover{background:var(--rule-2)}
.class-btn[aria-pressed="true"]{background:var(--rule-2);font-weight:700}
.dot{width:10px;height:10px;border-radius:50%;display:inline-block;flex:none}
.class-meta{font-size:13px;color:var(--muted);font-variant-numeric:tabular-nums;text-align:right}
.class-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.class-edit{font-size:13px}
.side-empty{color:var(--muted);font-size:14.5px;padding:12px 0}

/* toolbar */
.toolbar{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:8px}
.seg{display:inline-flex;border:1px solid var(--rule);border-radius:999px;padding:3px;gap:2px;background:var(--card)}
.seg button,.seg label span{display:inline-flex;align-items:center;min-height:36px;padding:0 14px;border-radius:999px;border:0;background:none;font-size:14.5px;font-weight:600;color:var(--ink-2)}
.seg button[aria-selected="true"]{background:var(--ink);color:var(--paper)}
.seg label{position:relative}
.seg label input{position:absolute;opacity:0;inset:0;margin:0;cursor:pointer}
.seg label input:checked+span{background:var(--ink);color:var(--paper)}
.seg label input:focus-visible+span{outline:2px solid var(--accent);outline-offset:1px}
.toggle{display:inline-flex;align-items:center;gap:8px;font-size:14.5px;font-weight:600;color:var(--ink-2);min-height:44px;cursor:pointer}
.toggle input{width:18px;height:18px;accent-color:var(--ink)}

/* list */
.group{margin-top:22px}
.group-h{display:flex;align-items:baseline;justify-content:space-between;border-bottom:2px solid var(--ink);padding-bottom:6px;margin:0}
.group-h h3{font-family:var(--serif);font-size:22px;font-weight:600;margin:0;letter-spacing:-.01em}
.group-h .count{font-size:13px;color:var(--muted);font-weight:700;font-variant-numeric:tabular-nums}
.group.overdue .group-h{border-color:var(--warn)}
.group.overdue .group-h h3{color:var(--warn)}
.item{display:grid;grid-template-columns:44px 1fr auto;align-items:center;border-bottom:1px solid var(--rule);min-height:64px}
.check{width:44px;height:44px;display:grid;place-items:center;background:none;border:0;padding:0}
.check span{width:22px;height:22px;border-radius:50%;border:2px solid var(--ink-2);display:grid;place-items:center;transition:background-color .15s ease,border-color .15s ease}
.item.is-done .check span{background:var(--ok);border-color:var(--ok)}
.item.is-done .check span::after{content:"";width:9px;height:5px;border:2px solid var(--paper);border-top:0;border-right:0;transform:translateY(-1px) rotate(-45deg)}
.item-main{background:none;border:0;text-align:left;padding:12px 8px 12px 4px;min-width:0;display:block;width:100%}
.item-title{display:block;font-size:16.5px;font-weight:600;overflow-wrap:anywhere}
.item.is-done .item-title{text-decoration:line-through;color:var(--muted)}
.item-sub{display:flex;flex-wrap:wrap;align-items:center;gap:4px 12px;margin-top:3px;font-size:13.5px;color:var(--muted)}
.item-sub .cls{display:inline-flex;align-items:center;gap:6px;color:var(--ink-2);font-weight:600}
.tag{font-size:11.5px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;padding:2px 7px;border-radius:4px;border:1px solid var(--rule);color:var(--ink-2)}
.tag.test{border-color:var(--warn);color:var(--warn)}
.tag.quiz{border-color:var(--accent);color:var(--accent)}
.item-due{text-align:right;padding-right:4px;font-variant-numeric:tabular-nums;white-space:nowrap}
.item-due b{display:block;font-size:14.5px}
.item-due small{font-size:12.5px;color:var(--muted)}
.item.is-late .item-due b{color:var(--warn)}
.score{font-weight:700;color:var(--ink)}

/* empty */
.empty{border-top:2px solid var(--ink);padding:28px 0}
.empty h3{font-family:var(--serif);font-size:28px;font-weight:500;margin:0 0 18px;letter-spacing:-.02em}
.steps{list-style:none;margin:0 0 22px;padding:0;counter-reset:s}
.steps li{counter-increment:s;display:grid;grid-template-columns:40px 1fr;gap:6px;padding:12px 0;border-bottom:1px solid var(--rule);font-size:16px}
.steps li::before{content:counter(s);font-family:var(--serif);font-size:24px;line-height:1.1;color:var(--muted)}
.steps li.done{color:var(--muted);text-decoration:line-through}
.empty .btn{margin-right:8px;margin-top:4px}
.empty-note{color:var(--muted);font-size:14.5px;margin-top:16px}
.nothing{padding:24px 0;color:var(--muted)}

/* dialogs */
dialog{border:1px solid var(--rule);border-radius:16px;background:var(--card);color:var(--ink);padding:0;width:min(560px,calc(100vw - 24px));max-height:calc(100dvh - 24px)}
dialog::backdrop{background:rgba(10,10,8,.45)}
dialog form{padding:24px;display:flex;flex-direction:column;gap:14px}
dialog h2{font-family:var(--serif);font-weight:600;font-size:26px;margin:0 0 4px;letter-spacing:-.015em}
.field{display:flex;flex-direction:column;gap:6px;border:0;margin:0;padding:0;min-width:0}
.field>span,.field legend{font-size:13.5px;font-weight:700;color:var(--ink-2);padding:0}
.field em{font-style:normal;font-weight:500;color:var(--muted)}
.field input,.field select,.field textarea{width:100%;min-height:46px;border:1px solid var(--rule);border-radius:var(--r);background:var(--paper);padding:10px 12px;font-size:16px}
.field textarea{resize:vertical}
.field input:focus,.field select:focus,.field textarea:focus{outline:2px solid var(--accent);outline-offset:0;border-color:transparent}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.seg-sm{align-self:flex-start;flex-wrap:wrap}
.form-err{color:var(--warn);font-weight:600;font-size:14px;margin:0;min-height:0}
.form-err:empty{display:none}
.dlg-actions{display:flex;align-items:center;gap:8px;margin-top:6px}
.spacer{flex:1}
.swatches{display:flex;flex-wrap:wrap;gap:8px}
.swatches label{position:relative;width:40px;height:40px;display:grid;place-items:center;cursor:pointer}
.swatches input{position:absolute;opacity:0;inset:0;margin:0;cursor:pointer}
.swatches span{width:30px;height:30px;border-radius:50%;box-shadow:inset 0 0 0 1px rgba(0,0,0,.15)}
.swatches input:checked+span{box-shadow:0 0 0 2px var(--card),0 0 0 4px var(--ink)}
.swatches input:focus-visible+span{outline:2px solid var(--accent);outline-offset:4px}

/* toast */
.toast{position:fixed;left:50%;bottom:calc(20px + env(safe-area-inset-bottom));transform:translateX(-50%);background:var(--ink);color:var(--paper);padding:10px 12px 10px 18px;border-radius:999px;display:flex;align-items:center;gap:12px;font-weight:600;font-size:15px;z-index:50;box-shadow:0 10px 30px rgba(0,0,0,.2);max-width:calc(100vw - 32px)}
.toast span{white-space:nowrap}
.toast .link-btn{color:var(--paper);text-decoration:underline}

/* footer + doc pages */
.foot{border-top:1px solid var(--rule);padding:28px 0 calc(36px + env(safe-area-inset-bottom));color:var(--muted);font-size:14px}
.foot-row{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 24px}
.foot p{margin:0}
.foot nav{display:flex;gap:20px}
.foot nav a{color:var(--ink-2);font-weight:600;text-decoration:none;padding:8px 0}
.foot nav a:hover{color:var(--ink)}
.doc{max-width:720px;padding-top:48px;padding-bottom:72px}
.doc h1{font-family:var(--serif);font-weight:500;font-size:clamp(36px,6vw,52px);letter-spacing:-.025em;line-height:1.05;margin:0 0 10px}
.doc .meta{color:var(--muted);margin:0 0 28px}
.doc .summary{border-top:2px solid var(--ink);border-bottom:1px solid var(--rule);padding:18px 0;font-size:18px;font-weight:600;margin-bottom:12px}
.doc h2{font-family:var(--serif);font-size:24px;font-weight:600;margin:36px 0 8px}
.doc p,.doc li{color:var(--ink-2);font-size:16.5px;line-height:1.7}
.doc li{margin-bottom:6px}

@media (prefers-reduced-motion:reduce){*{transition:none!important}}

/* phone */
@media (max-width:780px){
  .wrap{padding:0 16px}
  .menu{right:16px;left:16px;min-width:0}
  .hide-sm{display:none}
  .intro{padding:28px 0 14px}
  .stats{grid-template-columns:1fr 1fr;margin-bottom:24px}
  .stat{margin-left:0;padding:14px 12px 14px 0;border-right:0;border-bottom:1px solid var(--rule)}
  .stat:nth-child(odd){border-right:1px solid var(--rule)}
  .stat:nth-child(even){padding-left:14px}
  .stat:nth-child(n+3){border-bottom:0}
  .layout{grid-template-columns:1fr;gap:24px}
  .class-list{display:flex;gap:8px;overflow-x:auto;padding:10px 0 4px;scrollbar-width:none;overscroll-behavior-x:contain}
  .class-list li{border:0;flex:none}
  .class-btn{grid-template-columns:10px auto auto;border:1px solid var(--rule);border-radius:999px;padding:0 14px;min-height:40px;max-width:230px}
  .class-meta{display:none}
  .class-list li.edit-li .class-btn{border-style:dashed}
  .side-head{border:0;padding:0}
  .seg{width:100%;overflow-x:auto}
  .seg button{flex:1;justify-content:center;padding:0 10px}
  .item{grid-template-columns:44px 1fr}
  .item-due{grid-column:2;text-align:left;padding:0 0 12px 4px;margin-top:-8px}
  .item-due b,.item-due small{display:inline;margin-right:8px}
  .row2{grid-template-columns:1fr}
  dialog form{padding:20px 16px}
}