/* quchip.org shared theme: fonts, identity tokens (light + dark), type, header, footer, buttons, cards.
   Pages add their own layout on top. Colours follow quchip_identity/tokens/quchip.tokens.json. */
@font-face{font-family:"Space Grotesk";font-style:normal;font-weight:400 700;font-display:swap;src:url("../fonts/space-grotesk-latin-400-700.woff2") format("woff2")}
@font-face{font-family:"IBM Plex Mono";font-style:normal;font-weight:400;font-display:swap;src:url("../fonts/ibm-plex-mono-latin-400.woff2") format("woff2")}
@font-face{font-family:"IBM Plex Mono";font-style:normal;font-weight:500;font-display:swap;src:url("../fonts/ibm-plex-mono-latin-500.woff2") format("woff2")}
@font-face{font-family:"IBM Plex Mono";font-style:normal;font-weight:600;font-display:swap;src:url("../fonts/ibm-plex-mono-latin-600.woff2") format("woff2")}
@font-face{font-family:"STIX Two Text";font-style:normal;font-weight:400;font-display:swap;src:url("../fonts/STIXTwoText-Regular.woff2") format("woff2")}
@font-face{font-family:"STIX Two Text";font-style:italic;font-weight:400;font-display:swap;src:url("../fonts/STIXTwoText-Italic.woff2") format("woff2")}
@font-face{font-family:"STIX Two Text";font-style:normal;font-weight:600;font-display:swap;src:url("../fonts/STIXTwoText-SemiBold.woff2") format("woff2")}
@font-face{font-family:"Lora";font-style:italic;font-weight:600;font-display:swap;src:url("../fonts/lora-latin-600-italic.woff2") format("woff2")}

:root{
  color-scheme:light;
  --paper:#FAFBFC;--card:#FFFFFF;--panel:#F2F4F6;--ink:#16181C;--muted:#50565A;--soft:#6D7277;--faded:#9AA0A8;
  --line:#DBDEE1;--grid:#E7EAEE;--plate:#E4E7EA;--accent:#C92F33;--blue:#246FA8;
  --tint:rgba(201,47,51,.10);--glass:rgba(250,251,252,.78);--shadow:rgba(10,12,16,.45);
  --code-bg:#1E2126;--code-line:#2E3437;--code-fg:#E6E8EC;--code-soft:#85919A;--code-faded:#5B646B;--code-grid:#272B31;
  --code-accent:#EF6661;--code-blue:#4E8FC4;--code-number:#8FB8E8;--code-string:#F2C98A;
  --ui:"Space Grotesk","Helvetica Neue",Arial,sans-serif;--mono:"IBM Plex Mono",ui-monospace,Menlo,monospace;
  --math:"STIX Two Text","Times New Roman",serif;--wordmark:"Lora",Georgia,serif;
  --ease-out:cubic-bezier(.23,1,.32,1);--ease-io:cubic-bezier(.77,0,.175,1);--ease-drawer:cubic-bezier(.32,.72,0,1);
  --gut:20px;--max:1200px;--head:60px;
}
:root[data-theme="dark"]{
  color-scheme:dark;
  --paper:#14161A;--card:#1B1E24;--panel:#1E2126;--ink:#F2F4F6;--muted:#9FA6AA;--soft:#85919A;--faded:#6D7277;
  --line:#2A2F35;--grid:#23282D;--plate:#262B31;--accent:#EF6661;--blue:#4E8FC4;
  --tint:rgba(239,102,97,.13);--glass:rgba(20,22,26,.78);--shadow:rgba(0,0,0,.6);
  --code-bg:#1E2126;--code-line:#2E3437;
}
@media (min-width:760px){:root{--gut:40px}}
@media (prefers-reduced-transparency:reduce){:root{--glass:var(--paper)}}

*,*::before,*::after{box-sizing:border-box}
html{background:var(--paper);-webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--head) + 16px)}
@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}
body{margin:0;background:var(--paper);color:var(--ink);font:400 16px/1.55 var(--ui);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;-webkit-tap-highlight-color:transparent}
::selection{background:color-mix(in srgb,var(--accent) 22%,transparent)}
a{color:inherit}
button,input{font:inherit;color:inherit}
a,button,input,label,summary,[role=button]{touch-action:manipulation}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
sub,sup{line-height:0}
.wrap{max-width:var(--max);margin:0 auto;padding:0 var(--gut)}
.wrap>*{min-width:0}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:fixed;top:8px;left:12px;z-index:100;padding:10px 16px;border-radius:8px;background:var(--ink);color:var(--paper);transform:translateY(-160%);opacity:0}
.skip:focus{transform:none;opacity:1}
::view-transition-old(root),::view-transition-new(root){animation-duration:.26s;animation-timing-function:var(--ease-out)}

/* wordmark (quchip_identity/tokens/wordmark.partial.html) */
.q-wordmark{font-family:var(--wordmark);font-weight:600;font-style:italic;line-height:1;color:var(--ink);white-space:nowrap;display:inline-block}
.q-wordmark .p{font-style:normal;font-family:var(--math);font-weight:600;font-size:115%;vertical-align:-6%}
.q-wordmark .g{position:relative;display:inline-block}
.q-wordmark .hat{position:absolute;left:.097em;top:-.194em;width:.452em;height:.29em}
.q-wordmark .slash{position:absolute;left:-.009em;top:.26em;width:.29em;height:.177em}
.q-wordmark .ket{width:.3em;height:1.18em;vertical-align:-.355em;margin-left:.09em}
.q-wordmark .bra{width:.3em;height:1.18em;vertical-align:-.355em;margin-left:.04em;margin-right:.02em}
.q-wordmark .tensor{width:.52em;height:.52em;vertical-align:-.056em;margin-left:-.036em;color:var(--accent)}
.q-wordmark .acc{stroke:var(--accent)}
.wm{display:inline-flex;align-items:center;text-decoration:none;font-size:22px;border-radius:8px;transition:transform .16s var(--ease-out)}
.wm:active{transform:scale(.97)}

/* header */
.top{position:fixed;inset:0 0 auto;z-index:50;height:var(--head);background:var(--glass);-webkit-backdrop-filter:saturate(1.5) blur(16px);backdrop-filter:saturate(1.5) blur(16px);border-bottom:1px solid transparent;transition:border-color .3s}
.top.scrolled{border-bottom-color:var(--line)}
.top>.wrap{height:100%;display:flex;align-items:center;justify-content:space-between;gap:16px}
.top .right{display:flex;gap:2px;align-items:center}
.tb{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:44px;min-width:44px;padding:0 12px;border-radius:10px;text-decoration:none;color:var(--muted);font-size:15px;background:transparent;border:0;cursor:pointer;transition:color .15s,background .15s,transform .16s var(--ease-out)}
.tb:active{transform:scale(.95)}
@media (hover:hover) and (pointer:fine){.tb:hover{color:var(--ink);background:var(--grid)}}
.tb[aria-current="page"]{color:var(--accent)}
.tb.ic{padding:0}
.top .d{display:none}
@media (min-width:700px){.top .d{display:inline-flex}.top .tb.ic.lab{padding:0 12px}}
@media (max-width:359px){.top .tb.hide-xs{display:none}}
.themebtn .xi>*{grid-area:1/1}
.themebtn .sun,[data-theme="dark"] .themebtn .moon{opacity:0;transform:rotate(-40deg) scale(.6)}
[data-theme="dark"] .themebtn .sun{opacity:1;transform:none}
.themebtn svg{transition:opacity .2s var(--ease-out),transform .3s var(--ease-out)}

/* type */
.kick{font:500 12px var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--soft);display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.kick b{color:var(--accent);font-weight:500}
.lede{margin:0;font-size:clamp(17px,1.5vw,20px);line-height:1.5;color:var(--muted);text-wrap:pretty}
.prose a,a.ul{color:var(--accent);text-decoration:underline;text-decoration-color:color-mix(in srgb,var(--accent) 40%,transparent);text-underline-offset:3px;transition:text-decoration-color .15s}
@media (hover:hover) and (pointer:fine){.prose a:hover,a.ul:hover{text-decoration-color:currentColor}}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:50px;padding:0 22px;border-radius:12px;border:1px solid var(--line);background:var(--card);color:var(--ink);font:500 15px var(--ui);text-decoration:none;cursor:pointer;transition:border-color .2s,transform .16s var(--ease-out),background .2s,color .2s}
@media (hover:hover) and (pointer:fine){.btn:hover{border-color:var(--ink)}.btn.primary:hover{background:var(--accent);border-color:var(--accent);color:#fff}}
.btn:active{transform:scale(.97)}
.btn.primary{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.btn.sm{min-height:36px;padding:0 12px;border-radius:9px;font-size:13px;gap:8px}
.btn.sm:active{transform:scale(.95)}
.cta{display:flex;flex-wrap:wrap;gap:10px}
.pip{display:inline-flex;align-items:center;gap:6px;min-height:50px;padding:0 5px 0 20px;border-radius:12px;background:var(--ink);color:var(--paper);font:500 15px var(--mono);cursor:pointer;border:0;transition:background .2s,transform .16s var(--ease-out)}
@media (hover:hover) and (pointer:fine){.pip:hover{background:var(--accent);color:#fff}}
.pip:active{transform:scale(.97)}
.pip .dollar{opacity:.45;margin-right:6px}
.pip .cp{width:40px;height:40px;border-radius:8px;margin-left:10px;background:color-mix(in srgb,currentColor 12%,transparent)}

/* two-state labels and icons share one grid cell: the wider state sets the size, so nothing reflows */
.xf,.rl{display:inline-grid;text-align:left}.xi{display:inline-grid;place-items:center}
.xf>*,.rl>*{grid-area:1/1;transition:opacity .2s var(--ease-out),filter .2s var(--ease-out),transform .2s var(--ease-out)}
.xi>*{grid-area:1/1;transition:opacity .2s var(--ease-out),transform .25s var(--ease-out)}
.xf>.x1,.rl>*{opacity:0;filter:blur(3px);transform:translateY(5px)}.rl>.on{opacity:1;filter:none;transform:none}
.flipped .xf>.x0{opacity:0;filter:blur(3px);transform:translateY(-5px)}.flipped .xf>.x1{opacity:1;filter:none;transform:none}
.xi>.x1,.flipped .xi>.x0,.playing .xi>.x0{opacity:0;transform:scale(.4)}.flipped .xi>.x1,.playing .xi>.x1{opacity:1;transform:none}
.flipped.copy-error .xi>.x1{opacity:0}.flipped.copy-error .xi>.x0{opacity:1;transform:none}

/* link cards */
.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
@media (max-width:720px){.cards{grid-template-columns:minmax(0,1fr)}}
.card{display:flex;flex-direction:column;gap:8px;padding:22px 24px;border-radius:16px;background:var(--card);border:1px solid var(--line);color:var(--ink);text-decoration:none;transition:border-color .2s,transform .16s var(--ease-out)}
.card .ct{font:600 13.5px/1.4 var(--mono)}
.card .ct b{color:var(--accent);font-weight:600}
.card .cd{font-size:14.5px;line-height:1.6;color:var(--soft);text-wrap:pretty}
@media (hover:hover) and (pointer:fine){.card:hover{border-color:var(--accent)}}
.card:active{transform:scale(.985)}

/* the drive pulse, the site's divider */
/* narrow screens crop the flat ends rather than squeeze the pulse sideways */
.pulse-divider{color:var(--accent);opacity:.55;overflow:hidden;display:flex;justify-content:center}
.pulse-divider svg{display:block;flex:none;width:max(100%,720px);height:56px}
@media (max-width:720px){.pulse-divider svg{height:40px}}

/* footer */
.foot{border-top:1px solid var(--line)}
.foot>.wrap{display:flex;flex-wrap:wrap;gap:22px 40px;justify-content:space-between;align-items:flex-start;padding-top:30px;padding-bottom:calc(36px + env(safe-area-inset-bottom))}
.foot .fl{display:flex;flex-wrap:wrap;gap:4px 22px;font-size:14px;color:var(--muted);align-self:center}
.foot .fl a{text-decoration:none;padding:10px 0}
@media (hover:hover) and (pointer:fine){.foot .fl a:hover{color:var(--ink)}}
.foot .wm{align-self:center;font-size:20px}
.subf{display:grid;grid-template-columns:auto 44px;gap:6px 6px;align-items:center}
.subf input[type=email]{height:44px;width:min(260px,62vw);padding:0 14px;border:1px solid var(--line);border-radius:10px;background:var(--card);color:var(--ink);font:400 16px var(--ui);transition:border-color .15s}
.subf input[type=email]:focus{outline:none;border-color:var(--ink)}
.subf input[type=email]:disabled{opacity:.6}
.subf input::placeholder{color:var(--soft);opacity:1}
.subf button{height:44px;width:44px;border-radius:10px;border:0;background:var(--ink);color:var(--paper);cursor:pointer;transition:transform .14s var(--ease-out),opacity .2s}
.subf button:active:not(:disabled){transform:scale(.95)}
.subf button:disabled{opacity:.5;cursor:default}
.subf .msg{max-width:310px;grid-column:1/-1;min-height:18px;font:400 12.5px var(--mono);color:var(--soft);transition:opacity .18s}
.subf .msg.err{color:var(--accent)}

/* reveal on scroll (site.js adds .in) */
.js .rv{opacity:0;transform:translateY(22px);transition:opacity 1s var(--ease-out),transform 1s var(--ease-out)}
.js .rv.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.js .rv{opacity:1;transform:none;transition:none}.themebtn svg,.xf>*,.rl>*,.xi>*{transform:none!important;filter:none!important}}
@media (pointer:coarse){.btn.sm{min-height:44px}.tb{min-height:44px}}