/* NOTE-KU site — shared styles. Georgia + Courier New, same as the app. */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --ink:#0C0C0C;--ink2:#1A1A1A;--cream:#F5EFE0;--paper:#FAF6EC;--card:#EFE7D4;
  --red:#B91C1C;--red-d:#8F1414;--gold:#D4AF37;--gray:#6B6857;--line:#DDD4C0;--text:#2A2A2A;
  --serif:Georgia,'Times New Roman',serif;--mono:'Courier New',Courier,monospace;
  --wrap:1080px;--read:740px;
}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{background:var(--paper);color:var(--ink);font-family:var(--serif);font-size:18px;line-height:1.72;overflow-x:hidden}
img,svg{display:block;max-width:100%}
a{color:var(--red)}
a:hover{color:var(--red-d)}
p{margin-bottom:1.15rem;color:var(--text)}
strong{color:var(--ink)}
.skip{position:absolute;left:-9999px}
.skip:focus{left:12px;top:12px;z-index:200;background:#fff;padding:8px 12px}

/* ── Header ───────────────────────────── */
.site-head{position:sticky;top:0;z-index:100;background:var(--ink);border-bottom:2.5px solid var(--red)}
.head-row{max-width:var(--wrap);margin:0 auto;display:flex;align-items:center;gap:1rem;padding:0 clamp(16px,4vw,32px);height:58px}
.logo{display:flex;align-items:center;gap:.55rem;text-decoration:none;flex-shrink:0}
.logo svg{width:28px;height:28px}
.logo-text{font-family:var(--serif);font-weight:900;font-size:1.3rem;line-height:1;letter-spacing:.005em}
.logo-text .n{color:var(--red);font-style:italic}
.logo-text .k{color:var(--cream)}
.nav{display:flex;gap:clamp(.9rem,2vw,1.6rem);list-style:none;margin-left:auto}
.nav a{font-family:var(--mono);font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--cream);text-decoration:none;opacity:.75;font-weight:700;white-space:nowrap}
.nav a:hover,.nav a[aria-current=page]{opacity:1;color:#fff}
.nav a[aria-current=page]{border-bottom:2px solid var(--red);padding-bottom:2px}
.play-btn{font-family:var(--mono);font-size:.74rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;background:var(--red);color:#fff;text-decoration:none;padding:.55rem .95rem;white-space:nowrap;flex-shrink:0}
.play-btn:hover{background:var(--red-d);color:#fff}
.subnav{display:none}
@media(max-width:860px){
  .nav{display:none}
  .head-row{justify-content:space-between}
  .subnav{display:block;background:var(--ink2);border-top:1px solid #2a2a2a}
  .subnav ul{list-style:none;display:flex;gap:1.3rem;overflow-x:auto;padding:0 16px;height:38px;align-items:center;scrollbar-width:none}
  .subnav ul::-webkit-scrollbar{display:none}
  .subnav a{font-family:var(--mono);font-size:.68rem;letter-spacing:.12em;text-transform:uppercase;color:var(--cream);opacity:.78;text-decoration:none;font-weight:700;white-space:nowrap}
  .subnav a[aria-current=page]{opacity:1;color:#fff;border-bottom:2px solid var(--red)}
}

/* ── Layout ───────────────────────────── */
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 clamp(16px,4vw,32px)}
.read{max-width:var(--read);margin:0 auto;padding:0 clamp(16px,4vw,32px)}
section{padding:clamp(3rem,7vw,5.5rem) 0}
.section-cream{background:var(--cream);border-top:3px solid var(--ink);border-bottom:3px solid var(--ink)}
.section-dark{background:var(--ink);color:var(--cream)}
.section-dark p{color:#CFC6B2}
.section-dark h2,.section-dark h3{color:var(--cream)}
.eyebrow{font-family:var(--mono);font-size:.72rem;letter-spacing:.24em;text-transform:uppercase;color:var(--red);font-weight:700;display:flex;align-items:center;gap:.8rem;margin-bottom:1rem}
.eyebrow::after{content:'';flex:0 0 48px;height:1px;background:var(--red)}
h1{font-family:var(--serif);font-weight:900;line-height:1.08;font-size:clamp(2.1rem,5.6vw,3.6rem);margin-bottom:1.1rem;letter-spacing:-.01em}
h2{font-family:var(--serif);font-weight:900;line-height:1.15;font-size:clamp(1.65rem,3.6vw,2.4rem);margin-bottom:1rem}
h3{font-family:var(--serif);font-weight:900;font-size:1.25rem;line-height:1.3;margin:2rem 0 .7rem}
h1 .n,h2 .n{color:var(--red);font-style:italic}
.lede{font-size:clamp(1.08rem,2.2vw,1.24rem);font-style:italic;color:#3A3A3A;line-height:1.65;margin-bottom:1.8rem;max-width:680px}
.muted{color:var(--gray)}
.mono{font-family:var(--mono)}
ul.list,ol.list{margin:0 0 1.3rem 1.25rem;color:var(--text)}
ul.list li,ol.list li{margin-bottom:.55rem;padding-left:.2rem}
ul.list li::marker{color:var(--red)}
ol.list li::marker{color:var(--red);font-family:var(--mono);font-weight:700}

/* ── Buttons ──────────────────────────── */
.btns{display:flex;gap:.8rem;flex-wrap:wrap;align-items:center}
.btn{display:inline-flex;align-items:center;gap:.5rem;font-family:var(--mono);font-size:.82rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;text-decoration:none;padding:.95rem 1.6rem;border:2px solid var(--red);background:var(--red);color:#fff;cursor:pointer}
.btn:hover{background:var(--red-d);border-color:var(--red-d);color:#fff}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--ink)}
.btn-ghost:hover{background:var(--ink);color:var(--cream);border-color:var(--ink)}
.section-dark .btn-ghost,.hero .btn-ghost{color:var(--cream);border-color:rgba(245,239,224,.45)}
.section-dark .btn-ghost:hover,.hero .btn-ghost:hover{background:var(--cream);color:var(--ink)}

/* ── Hero ─────────────────────────────── */
.hero{background:var(--ink);color:var(--cream);position:relative;overflow:hidden;padding:clamp(3rem,8vw,6rem) 0 clamp(3rem,7vw,5rem)}
.hero::before{content:'';position:absolute;inset:0;background-image:linear-gradient(rgba(185,28,28,.10) 1px,transparent 1px),linear-gradient(90deg,rgba(185,28,28,.10) 1px,transparent 1px);background-size:56px 56px;pointer-events:none}
.hero::after{content:'';position:absolute;inset:0;background:radial-gradient(ellipse at 50% 30%,rgba(185,28,28,.16),transparent 60%);pointer-events:none}
.hero .wrap{position:relative;z-index:1;text-align:center}
.hero-mark{width:clamp(92px,16vw,128px);height:auto;margin:0 auto 1.4rem;filter:drop-shadow(0 0 40px rgba(185,28,28,.35))}
.hero-logo{font-family:var(--serif);font-weight:900;font-size:clamp(3rem,11vw,6rem);line-height:1;letter-spacing:-.02em;margin-bottom:.5rem}
.hero-logo .n{color:var(--red);font-style:italic}
.hero-kicker{font-family:var(--mono);font-size:.74rem;letter-spacing:.3em;text-transform:uppercase;color:#C8B898;margin-bottom:1.6rem}
.hero h1{color:var(--cream);font-size:clamp(1.6rem,4.2vw,2.5rem);max-width:760px;margin:0 auto 1rem}
.hero .lede{color:#CFC6B2;margin:0 auto 2rem;text-align:center}
.hero .btns{justify-content:center}
.hero-404{display:flex;flex-direction:column;justify-content:center;padding:56px 0}
.hero-404 .wrap{width:100%}
.hero-404::before{background-position:center center}
.hero-404::after{background:radial-gradient(ellipse at 50% 50%,rgba(185,28,28,.16),transparent 60%)}
.continue{display:none;margin:1.1rem auto 0;font-family:var(--mono);font-size:.8rem;letter-spacing:.08em;color:var(--cream);text-decoration:none;border-bottom:1px solid var(--red);padding-bottom:2px}
.continue.show{display:inline-block}
.facts{display:flex;flex-wrap:wrap;justify-content:center;gap:.5rem 1.4rem;margin-top:2.4rem;font-family:var(--mono);font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:#A89F8A}
.facts span::before{content:'✓ ';color:var(--red);font-weight:700}

/* ── Page header (inner pages) ────────── */
.page-head{background:var(--ink);color:var(--cream);padding:clamp(2.5rem,6vw,4rem) 0 clamp(2rem,5vw,3rem);position:relative;overflow:hidden}
.page-head::before{content:'';position:absolute;inset:0;background-image:linear-gradient(rgba(185,28,28,.09) 1px,transparent 1px),linear-gradient(90deg,rgba(185,28,28,.09) 1px,transparent 1px);background-size:56px 56px}
.page-head .read,.page-head .wrap{position:relative}
.page-head h1{color:var(--cream)}
.page-head .lede{color:#CFC6B2;margin-bottom:0}
.crumbs{font-family:var(--mono);font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;color:#A89F8A;margin-bottom:1.2rem}
.crumbs a{color:#C8B898;text-decoration:none}
.crumbs a:hover{color:#fff}
.article{padding:clamp(2.5rem,6vw,4rem) 0}
.article h2{margin-top:2.8rem;font-size:clamp(1.45rem,3vw,1.9rem)}
.article h2:first-child{margin-top:0}
.meta{font-family:var(--mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:#A89F8A;margin-top:1rem}

/* ── Cards & grids ────────────────────── */
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:clamp(1.2rem,3vw,2.2rem)}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(1.2rem,3vw,2rem)}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:clamp(1rem,2.5vw,1.6rem)}
@media(max-width:900px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:620px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}
.card{background:#fff;border:1.5px solid var(--line);padding:1.5rem 1.4rem;display:flex;flex-direction:column}
.card h3{margin:0 0 .5rem;font-size:1.15rem}
.card p{font-size:.98rem;margin-bottom:.8rem}
.card .more{margin-top:auto;font-family:var(--mono);font-size:.74rem;letter-spacing:.1em;text-transform:uppercase;font-weight:700;text-decoration:none}
a.card{text-decoration:none;color:inherit;transition:border-color .15s,transform .15s}
a.card:hover{border-color:var(--red);transform:translateY(-2px)}
.phase{border-top:3px solid var(--ink);padding-top:1.2rem}
.phase-num{font-family:var(--mono);font-size:2.4rem;font-weight:700;color:var(--red);opacity:.3;line-height:1;margin-bottom:.6rem}
.phase h3{margin:0 0 .5rem;font-size:1.3rem}
.phase p{font-size:1rem}
.section-dark .phase{border-top-color:var(--red)}
.feature{border-left:3px solid var(--red);padding:.2rem 0 .2rem 1rem}
.feature h3{margin:0 0 .35rem;font-size:1.08rem}
.feature p{font-size:.97rem;margin:0}
.pull{border-left:4px solid var(--red);padding:1.1rem 1.4rem;margin:2.2rem 0;font-size:clamp(1.1rem,2.4vw,1.3rem);font-style:italic;line-height:1.55;background:rgba(185,28,28,.05);color:var(--ink)}
.section-dark .pull{background:rgba(185,28,28,.12);color:var(--cream)}
.callout{background:var(--cream);border:2px solid var(--ink);padding:1.3rem 1.4rem;margin:2rem 0}
.callout .eyebrow{margin-bottom:.6rem}
.callout p:last-child{margin-bottom:0}
.rule{background:var(--ink);color:var(--cream);padding:1.5rem 1.6rem;margin:2rem 0;border-left:5px solid var(--red)}
.rule .eyebrow{color:#E46A6A}
.rule .eyebrow::after{background:#E46A6A}
.rule p{color:var(--cream);font-size:1.12rem;font-style:italic;margin-bottom:.6rem}
.rule p:last-child{margin-bottom:0}
table.data{width:100%;border-collapse:collapse;margin:1.6rem 0 2rem;font-size:.95rem}
table.data th,table.data td{text-align:left;padding:.7rem .8rem;border-bottom:1px solid var(--line);vertical-align:top}
table.data th{font-family:var(--mono);font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;color:var(--red)}
table.data td:first-child{font-weight:700;white-space:nowrap}
.section-dark table.data td,.section-dark table.data th{border-color:#333}
.section-dark table.data td{color:#E8E0CC}
.stars{color:var(--gold);letter-spacing:1px;white-space:nowrap}
.kbd{font-family:var(--mono);font-size:.85em;font-weight:700;background:var(--cream);border:1px solid var(--line);padding:.05rem .4rem;white-space:nowrap}
.toc{background:#fff;border:1.5px solid var(--line);padding:1.1rem 1.3rem;margin:0 0 2.4rem}
.toc .eyebrow{margin-bottom:.5rem}
.toc ol{margin-left:1.2rem;font-size:.95rem}
.toc li{margin:.2rem 0}
.toc a{text-decoration:none}

/* ── Sudoku illustrations (static, real puzzles) ── */
.boards{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(1rem,3vw,2rem);margin:2rem 0 1rem}
@media(max-width:760px){.boards{grid-template-columns:1fr;max-width:340px;margin-left:auto;margin-right:auto}}
.board-fig{margin:0}
.board-fig figcaption{font-family:var(--mono);font-size:.74rem;letter-spacing:.04em;color:var(--gray);margin-top:.7rem;line-height:1.5}
.board-fig figcaption b{color:var(--red);letter-spacing:.12em;text-transform:uppercase;display:block;font-size:.7rem;margin-bottom:.15rem}
.sg{display:grid;border:3px solid var(--ink);background:#fff;aspect-ratio:1;width:100%}
.sg.g6{grid-template-columns:repeat(6,1fr)}
.sg.g9{grid-template-columns:repeat(9,1fr)}
.sg .c{display:flex;align-items:center;justify-content:center;border-right:.5px solid #C9B99A;border-bottom:.5px solid #C9B99A;font-family:var(--mono);font-weight:700;aspect-ratio:1;min-width:0;overflow:hidden}
.sg.g6 .c{font-size:clamp(1rem,4.4vw,1.45rem)}
.sg.g9 .c{font-size:clamp(.8rem,3vw,1.15rem)}
.sg .c.br{border-right:2px solid var(--ink)}
.sg .c.bb{border-bottom:2px solid var(--ink)}
.sg .c.lr{border-right:none}
.sg .c.lb{border-bottom:none}
.sg .c .v{color:var(--ink)}
.sg .c .p{color:#C41010}
.sg .c .nt{display:flex;gap:2px;font-size:.58em;color:#990000;letter-spacing:0}
.sg .c .nt.one{font-size:.72em;color:#C41010}
.sg .c.hl{background:rgba(185,28,28,.10)}
.section-cream .sg{box-shadow:0 2px 18px rgba(0,0,0,.06)}

/* ── FAQ ──────────────────────────────── */
.faq details{border-bottom:1px solid rgba(0,0,0,.14);padding:.2rem 0}
.faq summary{list-style:none;cursor:pointer;font-family:var(--serif);font-weight:900;font-size:1.1rem;padding:1rem 2rem 1rem 0;position:relative;line-height:1.4}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:'+';position:absolute;right:0;top:.85rem;font-family:var(--mono);font-size:1.4rem;color:var(--red);transition:transform .2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq .a{padding:0 0 1.1rem}
.faq .a p{font-size:1rem}

/* ── Starter pack ─────────────────────── */
.pack{display:grid;grid-template-columns:1fr 1.1fr;gap:clamp(1.5rem,5vw,3.5rem);align-items:center}
@media(max-width:820px){.pack{grid-template-columns:1fr}}
.pack img{width:100%;height:auto;border:1px solid #2a2a2a}
.price{font-family:var(--mono);font-weight:700;font-size:2rem;color:var(--cream);margin:.6rem 0 1rem}
.price small{font-size:.8rem;color:#A89F8A;letter-spacing:.1em;margin-left:.4rem}
.fine{font-family:var(--mono);font-size:.74rem;letter-spacing:.03em;color:#A89F8A;margin-top:1rem;line-height:1.6}

/* ── CTA band ─────────────────────────── */
.cta-band{background:var(--ink);color:var(--cream);text-align:center;padding:2.4rem 1.4rem;margin:3rem 0 0;border-top:3px solid var(--red)}
.cta-band h2{color:var(--cream);font-size:clamp(1.4rem,3vw,1.9rem)}
.cta-band p{color:#CFC6B2;max-width:560px;margin:0 auto 1.4rem}
.cta-band .btns{justify-content:center}

/* ── Footer ───────────────────────────── */
.site-foot{background:var(--ink);color:#A89F8A;padding:3rem 0 2.2rem;border-top:3px solid var(--red)}
.foot-grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:2rem}
@media(max-width:760px){.foot-grid{grid-template-columns:1fr 1fr}}
.foot-brand p{color:#A89F8A;font-size:.92rem;margin:.8rem 0 0;max-width:280px}
.foot-col h4{font-family:var(--mono);font-size:.7rem;letter-spacing:.16em;text-transform:uppercase;color:var(--cream);margin-bottom:.8rem}
.foot-col ul{list-style:none}
.foot-col li{margin:.35rem 0}
.foot-col a{color:#C8BFA9;text-decoration:none;font-size:.95rem}
.foot-col a:hover{color:#fff}
.copy{font-family:var(--mono);font-size:.7rem;letter-spacing:.08em;margin-top:2.4rem;padding-top:1.4rem;border-top:1px solid #262626;text-align:center;color:#7E7765}
/* mobile refinements */
.sg.g9 .c .nt{font-size:.66em;gap:1px}
.callout .eyebrow::after,.toc .eyebrow::after{display:none}
@media(max-width:620px){
  table.data{font-size:.86rem}
  table.data th,table.data td{padding:.55rem .45rem}
  table.data td:first-child{white-space:normal}
  .sg.g9 .c .nt{font-size:.72em}
}