/* palette sampled from the CULTURE playbook of the design brief:
   cobalt #0042AF on cream, vermilion #FD4401 and sun #FDCB40 as accents */
:root{
  --paper:#F1EADA; --paper-2:#FEF1D0; --ink:#121212; --ink-soft:#6b6457;
  --blue:#0042AF; --red:#FD4401; --sun:#FDCB40; --line:rgba(18,18,18,.14);
  --tile:#fffaf0;
  --serif:'Fraunces',Georgia,serif; --he:'Frank Ruhl Libre','Times New Roman',serif;
  --mono:'IBM Plex Mono',ui-monospace,monospace;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --paper:#121418; --paper-2:#1b1f27; --ink:#F1EADA; --ink-soft:#a9a291;
    --blue:#6f9bff; --red:#ff7a45; --sun:#FDCB40; --line:rgba(241,234,218,.16); --tile:#1b1f27;
  }
}
:root[data-theme="dark"]{
  --paper:#121418; --paper-2:#1b1f27; --ink:#F1EADA; --ink-soft:#a9a291;
  --blue:#6f9bff; --red:#ff7a45; --sun:#FDCB40; --line:rgba(241,234,218,.16); --tile:#1b1f27;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font:400 18px/1.6 var(--serif);-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit}
.he{font-family:var(--he);direction:rtl;unicode-bidi:isolate}
.mono{font-family:var(--mono);font-size:12px;letter-spacing:.04em;text-transform:uppercase}
.small{font-size:11px}

/* bar */
.bar{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px clamp(16px,4vw,48px);background:color-mix(in srgb,var(--paper) 88%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.mark{display:flex;align-items:baseline;gap:10px;text-decoration:none;font-weight:700}
.mark .he{font-size:24px;font-weight:900;color:var(--blue)}
.mark span:last-child{font-family:var(--mono);font-size:12px;letter-spacing:.06em;text-transform:uppercase}
.bar nav{display:flex;gap:18px;font-family:var(--mono);font-size:12px;text-transform:uppercase;letter-spacing:.04em}
.bar nav a{text-decoration:none;opacity:.8}
.bar nav a:hover{opacity:1;color:var(--blue)}
@media (max-width:560px){.bar nav a:not(.out){display:none}}

/* hero */
.hero{min-height:min(calc(100svh - 56px),860px);display:flex;flex-direction:column;justify-content:center;padding:48px clamp(16px,6vw,96px) 64px;max-width:1240px;margin:0 auto}
.hero-eq{display:flex;flex-wrap:wrap;align-items:center;gap:clamp(6px,1.2vw,14px);min-height:clamp(110px,16vw,190px);margin-bottom:28px;direction:rtl;justify-content:flex-end}
h1{font-size:clamp(40px,7vw,96px);line-height:.98;letter-spacing:-.02em;font-weight:700;margin:0 0 20px;max-width:13ch}
.lede{font-size:clamp(18px,1.6vw,22px);max-width:58ch;margin:0 0 32px;color:var(--ink-soft)}
.quick label{display:block;margin-bottom:8px;color:var(--ink-soft)}
.quick-row{display:flex;align-items:stretch;gap:12px;max-width:560px}
.quick input,#calc-in{flex:1;min-width:0;font-size:32px;padding:10px 16px;border:2px solid var(--ink);border-radius:10px;background:var(--tile);color:var(--ink)}
.quick input:focus,#calc-in:focus{outline:3px solid var(--sun);outline-offset:2px}
.quick-out{min-width:3.5ch;display:flex;align-items:center;justify-content:center;padding:0 18px;border-radius:10px;background:var(--blue);color:#fff;font:700 32px var(--serif);font-variant-numeric:tabular-nums}
.hero-img{margin:40px 0 0;border-radius:18px;overflow:hidden;aspect-ratio:16/9}
.hero-img img{width:100%;height:100%;object-fit:cover;display:block}
.epi{margin:48px 0 0;padding:18px 0 0;border-top:1px solid var(--line);max-width:640px}
.epi blockquote{margin:0 0 6px;font-size:clamp(24px,2.6vw,32px);text-align:right}
.epi figcaption{color:var(--ink-soft);font-size:16px}
.epi figcaption .mono{display:block;margin-top:4px;font-size:11px}

/* tiles: a letter with its value underneath */
.tile{display:inline-flex;flex-direction:column;align-items:center;justify-content:center;min-width:1.6em;padding:.12em .2em .1em;border:1.5px solid var(--line);border-radius:.18em;background:var(--tile);font-family:var(--he);line-height:1;transition:background .25s,border-color .25s,transform .25s}
.tile b{font-weight:700}
.tile i{font:500 .34em var(--mono);font-style:normal;color:var(--ink-soft);margin-top:.28em;direction:ltr}
.tile.on{background:var(--paper-2);border-color:var(--blue);transform:translateY(-2px)}
.op{font:300 1em var(--serif);color:var(--ink-soft);padding:0 .08em}
.sum{font:700 1em var(--serif);color:var(--blue);font-variant-numeric:tabular-nums;direction:ltr}
.add{font:500 .8em var(--serif);color:var(--ink);font-variant-numeric:tabular-nums;direction:ltr}
.word{display:inline-flex;gap:.12em;direction:rtl}
.words-g{display:inline-flex;gap:.36em;direction:rtl}
/* an operator always travels with the term after it, so lines break between terms */
.seg{display:inline-flex;align-items:center;gap:.22em;white-space:nowrap;direction:rtl}
.hero-eq .tile{font-size:clamp(40px,7vw,92px)}
.hero-eq .op,.hero-eq .sum{font-size:clamp(40px,7vw,92px)}
.hero-eq{transition:opacity .4s}
.hero-eq.fade{opacity:0}

/* this week's parsha */
.parsha{max-width:1240px;margin:0 auto;padding:56px clamp(16px,6vw,96px);background:var(--paper-2);box-shadow:0 0 0 100vmax var(--paper-2);clip-path:inset(0 -100vmax)}
.parsha .kicker{color:var(--blue);margin:0 0 18px}
.pcard{display:grid;grid-template-columns:minmax(0,4fr) minmax(0,7fr);gap:clamp(20px,4vw,56px);align-items:start;padding:8px 0 28px}
.pcard + .pcard{border-top:1px solid var(--line);padding-top:32px}
.pname{margin:0}
.pname .he{display:block;font-size:clamp(56px,8vw,104px);font-weight:900;line-height:1;color:var(--ink)}
.pname .en{display:block;font:500 13px var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--ink-soft);margin-top:10px}
.pcard .eq{display:flex;flex-direction:column;align-items:flex-end;gap:12px;font-size:clamp(22px,2.4vw,32px);margin:0 0 20px}
.pcard .eq .row{display:flex;flex-wrap:wrap;align-items:center;gap:10px 12px;direction:rtl;width:100%;justify-content:flex-start}
.pcard .src figcaption{margin-top:8px}
.pempty{color:var(--ink-soft)}
.pindex{margin-top:12px}
.pindex summary{cursor:pointer;color:var(--ink-soft);padding:8px 0}
.pindex summary:hover{color:var(--blue)}
.pbook{margin:14px 0 4px;color:var(--ink-soft)}
.plist{display:flex;flex-wrap:wrap;gap:6px;direction:rtl}
.plist button{font:700 17px var(--he);padding:6px 12px;border:1px solid var(--line);border-radius:999px;background:var(--tile);color:var(--ink);cursor:pointer}
.plist button:hover,.plist button.on{border-color:var(--blue);color:var(--blue)}
.plist button[disabled]{opacity:.35;cursor:default}
@media (max-width:860px){.pcard{grid-template-columns:1fr}}

/* teachings */
.teachings{max-width:1240px;margin:0 auto;padding:24px clamp(16px,6vw,96px) 40px}
.t{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:clamp(24px,5vw,72px);align-items:start;padding:72px 0;border-top:1px solid var(--line)}
.t:nth-child(even){grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.t:nth-child(even) .t-fig{order:2}
.t-fig{position:sticky;top:90px;margin:0}
.t-art{position:relative;aspect-ratio:1;background:var(--paper-2);border-radius:18px;display:flex;align-items:center;justify-content:center;padding:6%;overflow:hidden}
.t-art svg{width:100%;height:100%}
.t-art img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.t-kick{color:var(--ink-soft);margin:0 0 10px}
.t h2{font-size:clamp(30px,4vw,52px);line-height:1.02;margin:0 0 22px;letter-spacing:-.015em}
.t .eq{display:flex;flex-direction:column;align-items:flex-end;gap:14px;font-size:clamp(24px,2.6vw,36px);margin:0 0 26px}
.t .eq .row{display:flex;flex-wrap:wrap;align-items:center;gap:10px 12px;direction:rtl;width:100%;justify-content:flex-start}
.verse{margin:0 0 20px;padding:14px 18px;border-right:4px solid var(--blue);background:var(--paper-2);border-radius:8px}
.verse blockquote{margin:0;font-size:22px;line-height:1.7;text-align:right}
.verse cite{display:block;font:500 11px var(--mono);letter-spacing:.04em;text-transform:uppercase;color:var(--ink-soft);direction:ltr;text-align:right;margin-top:4px;font-style:normal}
.en p{margin:0 0 14px}
.srcs{margin:22px 0 0;display:grid;gap:12px}
.src{margin:0;padding:14px 18px;border:1px solid var(--line);border-radius:10px}
.src blockquote{margin:0;font-size:20px;line-height:1.75;text-align:right}
.src figcaption{margin-top:8px;color:var(--ink-soft)}
.try{margin-top:20px;font:500 13px var(--mono);letter-spacing:.04em;text-transform:uppercase;background:none;border:0;border-bottom:2px solid var(--red);color:var(--ink);padding:4px 0;cursor:pointer}
.try:hover{color:var(--red)}
@media (max-width:860px){
  .t,.t:nth-child(even){grid-template-columns:1fr;padding:48px 0}
  .t:nth-child(even) .t-fig{order:0}
  .t-fig{position:relative;top:0;max-width:440px;width:100%;justify-self:center}
}

/* svg motion: drawings assemble when the teaching scrolls in */
.t-art .pop{opacity:0;transform-box:fill-box;transform-origin:center;transform:scale(.3)}
.t.seen .t-art .pop{animation:pop .5s cubic-bezier(.2,.9,.3,1.3) forwards;animation-delay:var(--d,0ms)}
.t-art .grow{stroke-dasharray:400;stroke-dashoffset:400}
.t.seen .t-art .grow{animation:draw 1.1s ease forwards;animation-delay:var(--d,0ms)}
.t-art .one{opacity:0}
.t.seen .t-art .one{animation:fadein .9s 1.6s forwards}
.t-art .lit{filter:drop-shadow(0 0 6px var(--sun))}
.t.seen .t-art .lit{animation:glow 2.4s 1s ease-in-out infinite alternate}
.t-art .up{animation:rise 4.2s linear infinite;animation-delay:var(--d,0ms);opacity:0}
.t-art .down{animation:fall 4.2s linear infinite;animation-delay:var(--d,0ms);opacity:0}
.t-art .tiny{font:500 10px var(--mono);fill:var(--ink-soft)}
.t-art .cal{font:600 15px var(--mono);letter-spacing:.12em}
.t-art .big{font-size:26px;font-weight:700}
.t-art .wheel{font-size:20px;font-weight:700}
.t-art .wheel.sm{font-size:15px;font-weight:500}
.t-art .lbl{font-size:18px;font-weight:700}
@keyframes pop{to{opacity:1;transform:scale(1)}}
@keyframes draw{to{stroke-dashoffset:0}}
@keyframes fadein{to{opacity:1}}
@keyframes glow{from{opacity:.55}to{opacity:1}}
@keyframes rise{0%{transform:translateY(0);opacity:0}10%{opacity:1}90%{opacity:1}100%{transform:translateY(-250px);opacity:0}}
@keyframes fall{0%{transform:translateY(0);opacity:0}10%{opacity:1}90%{opacity:1}100%{transform:translateY(250px);opacity:0}}
@media (prefers-reduced-motion:reduce){
  .t-art .pop,.t-art .one{opacity:1;transform:none;animation:none!important}
  .t-art .grow{stroke-dashoffset:0;animation:none!important}
  .t-art .up,.t-art .down{animation:none;opacity:1}
  .hero-eq{transition:none}
}

/* calculator */
.count{max-width:1240px;margin:0 auto;padding:72px clamp(16px,6vw,96px) 96px;border-top:1px solid var(--line)}
.kicker{color:var(--ink-soft);margin:0 0 10px}
.count h2{font-size:clamp(30px,4vw,52px);margin:0 0 26px;letter-spacing:-.015em;line-height:1.02}
.calc-in{display:flex;gap:10px;max-width:640px}
.kb-tog{border:2px solid var(--ink);background:none;color:var(--ink);border-radius:10px;padding:0 16px;cursor:pointer}
.kb[hidden]{display:none}
.kb{display:grid;grid-template-columns:repeat(11,1fr);gap:6px;max-width:640px;margin-top:10px;direction:rtl}
.kb button{font:700 22px var(--he);padding:8px 0;border:1px solid var(--line);border-radius:8px;background:var(--tile);color:var(--ink);cursor:pointer}
.kb button.fn{font:500 12px var(--mono);grid-column:span 2}
.calc-out{margin-top:28px}
.methods{width:100%;max-width:820px;border-collapse:collapse;font-size:17px}
.methods td{padding:10px 8px;border-bottom:1px solid var(--line);vertical-align:baseline}
.methods td:first-child{font-weight:700;white-space:nowrap}
.methods td:nth-child(2){color:var(--ink-soft);font-size:15px}
.methods td:last-child{text-align:right;font:700 22px var(--serif);color:var(--blue);font-variant-numeric:tabular-nums}
.methods td .he{font-weight:700}
.big-v{font:700 clamp(56px,9vw,120px)/1 var(--serif);color:var(--blue);margin:0 0 10px;font-variant-numeric:tabular-nums}
.match{margin:22px 0 0;padding:16px 18px;border-radius:10px;background:var(--paper-2)}
.match a{color:var(--blue)}
.words{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.words span{font:700 20px var(--he);padding:4px 10px;border:1px solid var(--line);border-radius:6px;background:var(--tile)}
.words span small{font:400 11px var(--mono);color:var(--ink-soft);margin-right:6px}
.note{color:var(--ink-soft);font-size:15px}

.foot{border-top:1px solid var(--line);padding:32px clamp(16px,6vw,96px);text-align:center;color:var(--ink-soft)}
.foot p{margin:4px 0}

/* English toggle */
.wcol{display:inline-flex;flex-direction:column;align-items:center;gap:4px}
.wtr{font:400 13px/1.25 var(--serif);color:var(--ink-soft);direction:ltr;text-align:center;max-width:16em;white-space:normal}
.hero-eq .wtr{font-size:15px}
.vtr{margin:10px 0 0;font:400 16px/1.55 var(--serif);color:var(--ink);direction:ltr;text-align:left}
.src .vtr{font-size:15.5px;color:var(--ink-soft)}
body.no-en .tr{display:none}

.cap{font:400 14px/1.4 var(--serif);color:var(--ink-soft);text-align:center;margin:10px 6px 0}
/* what it teaches */
.drush{margin:26px 0 0;padding:20px 22px;border-radius:14px;background:var(--paper-2);border:1px solid var(--line)}
.drush .dk{color:var(--red);margin:0 0 10px}
.den{margin:0 0 14px;font-size:18px;line-height:1.6}
.drush .src{background:var(--tile)}
.drush .src + .src{margin-top:10px}

/* עב | EN switch */
.lang{display:inline-flex;border:1.5px solid var(--ink);border-radius:999px;overflow:hidden;flex-shrink:0}
.lang button{border:0;background:none;color:var(--ink);cursor:pointer;padding:6px 14px;font:600 13px var(--mono);letter-spacing:.04em}
.lang button[data-l="he"]{font:700 16px var(--he);padding:3px 14px}
.lang button[aria-pressed="true"]{background:var(--ink);color:var(--paper)}
.lang button:focus-visible{outline:3px solid var(--sun);outline-offset:-3px}
.bar nav{align-items:center}

/* a Hebrew word in running English: each letter's value beneath it */
.iw{display:inline-flex;gap:.6em;margin:0 .2em;direction:rtl;align-items:baseline}
.iww{display:inline-flex;gap:.1em;direction:rtl;align-items:baseline}
.il{display:inline-flex;flex-direction:column;align-items:center;line-height:1;min-width:1.05em}
.il b{font:700 1.12em var(--he);color:var(--ink)}
.il i{font:500 .42em var(--mono);font-style:normal;color:var(--blue);margin-top:.3em;letter-spacing:0}
.en p,.den,.lede{line-height:2.05}
.lede .il i{font-size:.55em}