/* ============================================================================
   Base Case — "The night slate"
   Chalk on green-black slate. Reading is theater; logging is a light switch.
   ========================================================================= */

/* ---------------------------------------------------------------- fonts */
@font-face{font-family:'Clash Display';src:url('./fonts/ClashDisplay-600.woff2') format('woff2');
  font-weight:600;font-style:normal;font-display:swap}
@font-face{font-family:'Satoshi';src:url('./fonts/Satoshi-400.woff2') format('woff2');
  font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:'Satoshi';src:url('./fonts/Satoshi-500.woff2') format('woff2');
  font-weight:500;font-style:normal;font-display:swap}
@font-face{font-family:'Satoshi';src:url('./fonts/Satoshi-700.woff2') format('woff2');
  font-weight:700;font-style:normal;font-display:swap}
@font-face{font-family:'Erode';src:url('./fonts/Erode-400.woff2') format('woff2');
  font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:'Erode';src:url('./fonts/Erode-500.woff2') format('woff2');
  font-weight:500;font-style:normal;font-display:swap}
@font-face{font-family:'Geist Mono';src:url('./fonts/GeistMono-400.woff2') format('woff2');
  font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:'Geist Mono';src:url('./fonts/GeistMono-500.woff2') format('woff2');
  font-weight:500;font-style:normal;font-display:swap}
@font-face{font-family:'Caveat';src:url('./fonts/Caveat-500.woff2') format('woff2');
  font-weight:500;font-style:normal;font-display:swap}

/* Metric-matched fallbacks — the part that actually gets CLS to zero.
   The fallback occupies the same space as the webfont, so nothing reflows. */
@font-face{font-family:'Satoshi Fallback';src:local('Segoe UI'),local('Arial');
  size-adjust:96.5%;ascent-override:98%;descent-override:24%;line-gap-override:0%}
@font-face{font-family:'Clash Fallback';src:local('Segoe UI Semibold'),local('Arial Bold');
  size-adjust:97%;ascent-override:96%;descent-override:22%;line-gap-override:0%}
@font-face{font-family:'Erode Fallback';src:local('Georgia'),local('Times New Roman');
  size-adjust:101%;ascent-override:92%;descent-override:24%;line-gap-override:0%}

/* View transitions: a fast crossfade only. The default 250ms feels slow on a
   tool you use every day. */
@view-transition{navigation:auto}
::view-transition-old(root),::view-transition-new(root){animation-duration:150ms}
@media (prefers-reduced-motion:reduce){
  ::view-transition-old(root),::view-transition-new(root){animation:none}
}

/* --------------------------------------------------------------- tokens */
:root{
  --slate:#121714; --raised:#1B211D; --raised-2:#222926;
  --chalk:#E9E4D7; --dust:#8B9289;
  --vermilion:#FF6142; --moss:#7FBF9E; --ochre:#E0A458;
  --hairline:rgba(255,255,255,.07); --hairline-2:rgba(255,255,255,.12);
  --grid:rgba(255,255,255,.03); --grid-major:rgba(255,255,255,.045);

  --display:'Clash Display','Clash Fallback',ui-sans-serif,system-ui,sans-serif;
  --ui:'Satoshi','Satoshi Fallback',ui-sans-serif,system-ui,-apple-system,sans-serif;
  --prose:'Erode','Erode Fallback',Georgia,'Times New Roman',serif;
  --mono:'Geist Mono',ui-monospace,'Cascadia Code',Consolas,monospace;
  --hand:'Caveat',cursive;

  --r:8px; --sp:4px; --max:1120px;
  --t-fast:120ms; --t:180ms; --t-snap:240ms; --t-slow:280ms;
  --ease:cubic-bezier(.2,0,0,1);
  --ease-snap:cubic-bezier(.34,1.56,.64,1);
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0; background:var(--slate); color:var(--chalk);
  font-family:var(--ui); font-size:15px; line-height:1.5;
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
  background-image:
    linear-gradient(var(--grid) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid) 1px,transparent 1px),
    linear-gradient(var(--grid-major) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid-major) 1px,transparent 1px);
  background-size:24px 24px,24px 24px,96px 96px,96px 96px;
  min-height:100vh;
}
/* film grain — kills the flat-panel deadness of solid dark */
body::after{content:"";position:fixed;inset:0;pointer-events:none;z-index:1;opacity:.025;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='120' height='120' filter='url(%23n)'/%3E%3C/svg%3E")}

h1,h2,h3,h4{margin:0;font-family:var(--display);font-weight:600;line-height:1.2;color:var(--chalk)}
p{margin:0}
a{color:inherit;text-decoration:none}
button{font-family:inherit;color:inherit}
.wrap{max-width:var(--max);margin:0 auto;padding:28px 24px 96px;position:relative;z-index:2}
.hide{display:none !important}
.mono{font-family:var(--mono);font-variant-numeric:tabular-nums}
.hand{font-family:var(--hand);font-size:19px;line-height:1.3;color:var(--dust)}
.dust{color:var(--dust)}

/* type scale */
.t-display-xl{font-family:var(--display);font-size:40px;line-height:1.1;letter-spacing:-.01em}
.t-display{font-family:var(--display);font-size:28px;line-height:1.21}
.t-title{font-family:var(--display);font-weight:500;font-size:20px;line-height:1.3}
.t-label{font-family:var(--ui);font-weight:500;font-size:13px;line-height:1.38;
  letter-spacing:.04em;text-transform:uppercase;color:var(--dust)}
.t-chip{font-family:var(--mono);font-weight:500;font-size:12px;line-height:1.33;
  font-variant-numeric:tabular-nums}
.t-code{font-family:var(--mono);font-size:13.5px;line-height:1.63}

/* --------------------------------------------------------------- chrome */
header.top{position:sticky;top:0;z-index:30;background:rgba(18,23,20,.86);
  backdrop-filter:blur(10px);border-bottom:1px solid var(--hairline)}
.top-in{max-width:var(--max);margin:0 auto;padding:0 24px;display:flex;align-items:center;gap:6px;height:58px}
.brand{display:flex;align-items:baseline;gap:9px;margin-right:20px;flex:none}
.brand b{font-family:var(--display);font-weight:600;font-size:17px;letter-spacing:-.01em}
.brand i{font-family:var(--mono);font-size:11px;color:var(--dust);font-style:normal}
nav.tabs{display:flex;gap:2px;margin-right:auto;flex-wrap:wrap}
nav.tabs button{background:none;border:none;border-bottom:2px solid transparent;
  font-size:14.5px;color:var(--dust);padding:8px 12px 7px;cursor:pointer;position:relative;
  transition:color var(--t-fast) var(--ease)}
nav.tabs button:hover{color:var(--chalk)}
nav.tabs button.on{color:var(--chalk);border-bottom-color:var(--vermilion)}
nav.tabs button .cnt{font-family:var(--mono);font-size:10.5px;background:var(--ochre);
  color:#1a1207;border-radius:999px;padding:1px 5px;margin-left:6px;font-weight:500;vertical-align:1px}
.who{display:flex;align-items:center;gap:12px;font-size:13.5px;color:var(--dust);flex:none}
.who b{color:var(--chalk);font-weight:500}

/* ---------------------------------------------------------------- cards */
/* crop-mark corners instead of heavy borders — drafting-sheet detail */
.card{position:relative;background:var(--raised);border-radius:var(--r);padding:18px;
  border:1px solid transparent;transition:border-color var(--t-fast) var(--ease)}
.card::before,.card::after{content:"";position:absolute;width:7px;height:7px;pointer-events:none;
  border-color:var(--dust);opacity:.5;transition:opacity var(--t-fast) var(--ease)}
.card::before{top:6px;left:6px;border-left:1px solid;border-top:1px solid}
.card::after{bottom:6px;right:6px;border-right:1px solid;border-bottom:1px solid}
.card:hover{border-color:var(--hairline)}
.card.flat{background:transparent}

/* ------------------------------------------------------------- controls */
.btn{font-family:var(--ui);font-size:14px;font-weight:500;padding:9px 15px;border-radius:var(--r);
  border:1px solid var(--hairline);background:var(--raised-2);color:var(--chalk);cursor:pointer;
  transition:border-color var(--t-fast) var(--ease),background var(--t-fast) var(--ease)}
.btn:hover{border-color:var(--hairline-2)}
.btn.pri{background:var(--vermilion);border-color:transparent;color:#2a0d05;font-weight:700}
.btn.pri:hover{filter:brightness(1.07)}
.btn.ghost{background:none}
.btn.sm{padding:6px 11px;font-size:13px}
.btn:disabled{opacity:.45;cursor:default}
:focus-visible{outline:2px solid var(--vermilion);outline-offset:2px;border-radius:3px}

input,select,textarea{font-family:var(--ui);font-size:14.5px;color:var(--chalk);
  background:var(--slate);border:1px solid var(--hairline);border-radius:var(--r);padding:10px 12px;width:100%}
input::placeholder,textarea::placeholder{color:var(--dust);opacity:.65}
label.f{display:block;margin-bottom:14px}
label.f>span{display:block;margin-bottom:6px;font-family:var(--ui);font-weight:500;font-size:13px;
  letter-spacing:.04em;text-transform:uppercase;color:var(--dust)}

/* status vocabulary */
.dot{width:9px;height:9px;border-radius:50%;flex:none;border:1.5px solid var(--dust)}
.dot.solved{background:var(--moss);border-color:var(--moss)}
.dot.hinted{background:var(--ochre);border-color:var(--ochre)}
.dot.settled{background:var(--moss);border-color:var(--moss);box-shadow:0 0 0 3px rgba(127,191,158,.18)}
.dot.owed{border-color:var(--vermilion)}

.chip{display:inline-flex;align-items:center;gap:5px;font-family:var(--mono);font-weight:500;
  font-size:12px;padding:3px 8px;border-radius:999px;border:1px solid var(--hairline);color:var(--dust);
  white-space:nowrap}
.chip.moss{color:var(--moss);border-color:rgba(127,191,158,.35)}
.chip.ochre{color:var(--ochre);border-color:rgba(224,164,88,.35)}
.chip.verm{color:var(--vermilion);border-color:rgba(255,97,66,.35)}
.chip.easy{color:var(--moss)} .chip.med{color:var(--ochre)} .chip.hard{color:var(--vermilion)}
.chip.pick{cursor:pointer;transition:all var(--t-fast) var(--ease)}
.chip.pick:hover{border-color:var(--hairline-2);color:var(--chalk)}
.chip.pick.on{background:var(--vermilion);border-color:var(--vermilion);color:#2a0d05}

/* progress hairline */
.bar{height:2px;background:var(--hairline);border-radius:2px;overflow:hidden;position:relative}
.bar>i{position:absolute;inset:0 100% 0 0;background:var(--moss);border-radius:2px;
  transition:right var(--t-slow) var(--ease)}
.bar.verm>i{background:var(--vermilion)}

/* ---------------------------------------------------------------- TODAY */
.dayline{margin-bottom:6px}
.dayline h1{font-size:40px;letter-spacing:-.01em}
.summary{font-size:15.5px;color:var(--dust);margin-top:6px}
.summary a{color:var(--chalk);border-bottom:1px solid var(--vermilion);padding-bottom:1px}
.summary a:hover{color:var(--vermilion)}
.zone{margin-top:34px}
.zone-h{display:flex;align-items:baseline;gap:12px;margin-bottom:12px}
.zone-h .t-label{margin:0}
.zone-h .more{margin-left:auto;font-size:13px;color:var(--dust);cursor:pointer}
.zone-h .more:hover{color:var(--vermilion)}

.duerow{display:grid;grid-template-columns:repeat(auto-fill,minmax(248px,1fr));gap:12px}
.duecard .t-title{margin-bottom:3px}
.duecard .meta{font-family:var(--mono);font-size:12px;color:var(--dust);margin-bottom:14px}

.continue{display:flex;align-items:center;gap:20px;flex-wrap:wrap}
.continue .grow{flex:1;min-width:220px}

/* the quiet band — stats as a footnote, by design */
.band{margin-top:38px;border-top:1px solid var(--hairline);padding-top:14px;
  display:flex;gap:28px;flex-wrap:wrap;align-items:baseline}
.band .s{display:flex;align-items:baseline;gap:7px}
.band .s b{font-family:var(--mono);font-weight:500;font-size:16px;color:var(--chalk);
  font-variant-numeric:tabular-nums}
.band .s span{font-size:12.5px;color:var(--dust)}

/* --------------------------------------------------------------- COURSE */
.unit{margin-top:30px}
.unit .t-label{margin-bottom:8px;display:block}
.syl{border-top:1px solid var(--hairline)}
.srow{display:flex;align-items:center;gap:16px;padding:15px 10px;border-bottom:1px solid var(--hairline);
  cursor:pointer;transition:background var(--t-fast) var(--ease)}
.srow:hover{background:var(--raised)}
.srow .n{font-family:var(--display);font-weight:600;font-size:26px;color:var(--dust);
  min-width:38px;font-variant-numeric:tabular-nums}
.srow:hover .n{color:var(--chalk)}
.srow .nm{flex:1;min-width:0}
.srow .nm b{font-family:var(--display);font-weight:500;font-size:19px;display:block}
.srow .nm .bl{font-size:13px;color:var(--dust);margin-top:2px;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.srow .frac{font-family:var(--mono);font-size:13px;color:var(--dust);
  font-variant-numeric:tabular-nums;flex:none}
.srow .bar{width:96px;flex:none}
.srow .chip{flex:none}
@media(max-width:820px){.srow .nm .bl{display:none}}

/* topic dossier */
.back{display:flex;align-items:center;gap:7px;font-size:13.5px;color:var(--dust);
  margin-bottom:14px;cursor:pointer;width:fit-content}
.back:hover{color:var(--vermilion)}
.hero-lesson{display:flex;gap:22px;align-items:flex-start;flex-wrap:wrap;margin-bottom:26px;padding:22px}
.hero-lesson .grow{flex:1;min-width:260px}
.hero-lesson h2{font-size:26px;margin-bottom:8px}
.hero-lesson p{color:var(--dust);font-size:14.5px;max-width:62ch}

.plist{border-top:1px solid var(--hairline)}
.prow{display:flex;align-items:center;gap:13px;padding:11px 10px;border-bottom:1px solid var(--hairline);
  transition:background var(--t-fast) var(--ease)}
.prow:hover{background:var(--raised)}
.prow .num{font-family:var(--mono);font-size:12px;color:var(--dust);min-width:42px}
.prow .ttl{flex:1;min-width:0;font-size:14.5px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.prow.done .ttl{color:var(--dust)}
.prow .acts{display:flex;gap:7px;align-items:center;flex:none}
.prow .acts a{font-family:var(--mono);font-size:11.5px;color:var(--dust);
  border-bottom:1px solid transparent;transition:color var(--t-fast)}
.prow .acts a:hover{color:var(--vermilion);border-bottom-color:var(--vermilion)}
.tick{width:19px;height:19px;border-radius:5px;border:1.5px solid var(--dust);background:none;
  cursor:pointer;flex:none;display:grid;place-items:center;padding:0;
  transition:all var(--t-snap) var(--ease-snap)}
.tick:hover{border-color:var(--chalk)}
.tick.on{background:var(--moss);border-color:var(--moss)}
.tick.on::after{content:"";width:5px;height:9px;border:solid #10231a;border-width:0 2px 2px 0;
  transform:rotate(45deg) translateY(-1px)}

/* -------------------------------------------------------------- REVIEW */
.qcard{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-bottom:10px;padding:15px 17px}
.qcard .grow{flex:1;min-width:200px}
.qcard .rung{font-family:var(--mono);font-size:11.5px;color:var(--ochre)}
.empty{text-align:center;padding:52px 20px;color:var(--dust)}
.empty svg{margin-bottom:14px}
.empty .hand{font-size:22px;color:var(--dust)}

/* --------------------------------------------------------------- TABLE */
table{width:100%;border-collapse:collapse;font-size:14px}
th,td{text-align:left;padding:11px 12px;border-bottom:1px solid var(--hairline)}
thead th{font-family:var(--ui);font-weight:500;font-size:12px;letter-spacing:.04em;
  text-transform:uppercase;color:var(--dust)}
td.n{font-family:var(--mono);font-variant-numeric:tabular-nums}
tbody tr:hover{background:var(--raised)}

/* the pact — head to head */
.pact{display:grid;grid-template-columns:1fr auto 1fr;gap:22px;align-items:start;margin-top:20px}
.pact .side{padding:22px}
.pact .side h3{font-size:26px;margin-bottom:14px}
.pact .spine{width:1px;background:var(--hairline);align-self:stretch;min-height:200px}
.pact .stat{display:flex;align-items:baseline;justify-content:space-between;gap:14px;
  padding:9px 0;border-bottom:1px solid var(--hairline)}
.pact .stat:last-child{border-bottom:none}
.pact .stat b{font-family:var(--mono);font-weight:500;font-size:19px;font-variant-numeric:tabular-nums}
.pact .stat span{font-size:13px;color:var(--dust)}
@media(max-width:760px){.pact{grid-template-columns:1fr}.pact .spine{display:none}}

/* --------------------------------------------------------------- PALETTE */
.pal-bg{position:fixed;inset:0;background:rgba(10,13,11,.6);z-index:60;display:flex;
  align-items:flex-start;justify-content:center;padding:14vh 20px 20px}
.pal{width:100%;max-width:560px;background:var(--raised);border:1px solid var(--hairline-2);
  border-radius:12px;overflow:hidden;box-shadow:0 24px 70px rgba(0,0,0,.55)}
.pal input.q{border:none;border-bottom:1px solid var(--hairline);border-radius:0;
  padding:16px 18px;font-size:16px;background:none}
.pal input.q:focus{outline:none}
.pal .res{max-height:270px;overflow:auto}
.pal .r{display:flex;align-items:center;gap:11px;padding:10px 18px;cursor:pointer;font-size:14px}
.pal .r:hover,.pal .r.sel{background:var(--raised-2)}
.pal .r .num{font-family:var(--mono);font-size:11.5px;color:var(--dust);min-width:40px}
.pal .r .tp{margin-left:auto;font-size:12px;color:var(--dust)}
.pal .form{padding:16px 18px;border-top:1px solid var(--hairline)}
.seg{display:flex;gap:0;border:1px solid var(--hairline);border-radius:var(--r);overflow:hidden;width:fit-content}
.seg button{background:none;border:none;padding:7px 13px;font-size:13px;color:var(--dust);cursor:pointer;
  border-right:1px solid var(--hairline)}
.seg button:last-child{border-right:none}
.seg button.on{background:var(--vermilion);color:#2a0d05;font-weight:700}
.cxrow{display:flex;gap:6px;flex-wrap:wrap;margin-top:7px}
.note-verm{font-family:var(--mono);font-size:12px;color:var(--ochre);margin-top:10px}

/* --------------------------------------------------------------- AUTH */
.auth-wrap{min-height:100vh;display:grid;place-items:center;padding:24px;position:relative;z-index:2}
.auth{width:100%;max-width:430px}
.auth .lede{color:var(--dust);font-size:14.5px;margin:10px 0 24px;max-width:44ch}
.auth-tabs{display:flex;gap:4px;border-bottom:1px solid var(--hairline);margin-bottom:20px}
.auth-tabs button{background:none;border:none;border-bottom:2px solid transparent;color:var(--dust);
  padding:9px 13px;cursor:pointer;font-size:14.5px;font-family:var(--ui)}
.auth-tabs button.on{color:var(--chalk);border-bottom-color:var(--vermilion)}
.err{color:var(--vermilion);font-size:13.5px;margin-top:12px;min-height:19px}

/* --------------------------------------------------------------- misc */
.toast{position:fixed;left:50%;bottom:26px;transform:translateX(-50%) translateY(14px);opacity:0;
  background:var(--raised-2);border:1px solid var(--hairline-2);border-radius:10px;padding:11px 18px;
  font-size:13.5px;z-index:80;transition:opacity var(--t) var(--ease),transform var(--t) var(--ease);
  pointer-events:none;box-shadow:0 16px 44px rgba(0,0,0,.5)}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
.heat{display:grid;grid-auto-flow:column;grid-template-rows:repeat(7,9px);gap:2px;overflow-x:auto}
.heat i{width:9px;height:9px;border-radius:2px;background:rgba(255,255,255,.05)}
.heat i[data-l="1"]{background:rgba(127,191,158,.28)}
.heat i[data-l="2"]{background:rgba(127,191,158,.5)}
.heat i[data-l="3"]{background:rgba(127,191,158,.72)}
.heat i[data-l="4"]{background:var(--moss)}
.fab{position:fixed;right:24px;bottom:24px;z-index:40;width:auto;padding:12px 18px;border-radius:999px;
  box-shadow:0 12px 32px rgba(0,0,0,.45)}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

@media (prefers-reduced-motion:reduce){
  *{transition-duration:80ms !important;animation-duration:.001ms !important}
}
@media(max-width:720px){
  .wrap{padding:20px 16px 90px}
  .top-in{padding:0 16px;height:auto;flex-wrap:wrap;gap:4px;padding-top:8px;padding-bottom:6px}
  .dayline h1{font-size:31px}
  .srow{gap:11px;padding:13px 6px}
  .srow .bar{display:none}
  .brand{margin-right:8px}
}