/* ============================================================
   Ridge Sound. Single shared foundation for every page.
   Tokens, faces, reset, browser surfaces, nav, buttons, footer,
   and the long-form document shell. Page-specific CSS stays in
   the page. There is exactly one copy of the token block.
   ============================================================ */

@font-face{font-family:'Cormorant';font-style:normal;font-weight:300 700;font-display:swap;src:url(fonts/cormorant.woff2) format('woff2')}
@font-face{font-family:'Cormorant';font-style:italic;font-weight:300 700;font-display:swap;src:url(fonts/cormorant-italic.woff2) format('woff2')}
@font-face{font-family:'Karla';font-style:normal;font-weight:200 800;font-display:swap;src:url(fonts/karla.woff2) format('woff2')}
@font-face{font-family:'Karla';font-style:italic;font-weight:200 800;font-display:swap;src:url(fonts/karla-italic.woff2) format('woff2')}
@font-face{font-family:'PlexMono';font-style:normal;font-weight:400;font-display:swap;src:url(fonts/plexmono-400.woff2) format('woff2')}
@font-face{font-family:'PlexMono';font-style:normal;font-weight:500;font-display:swap;src:url(fonts/plexmono-500.woff2) format('woff2')}

:root{
  /* ---- ground ---- */
  --bg-0:#05070b;
  --bg-1:#0a0e14;
  --bg-2:#0e141c;
  --bg-3:#131a24;

  --line:rgba(126,160,196,.13);
  --line-mid:rgba(126,160,196,.24);
  --line-hot:rgba(63,169,245,.42);

  /* ---- ink. every value clears 4.5:1 on --bg-0 and on --bg-3 ---- */
  --txt:#c8d6e5;
  --txt-hi:#eaf4ff;
  --txt-dim:#8b9bb0;
  --txt-faint:#7a8ba1;

  --cyan:#3fa9f5;
  --ice:#7fe3ff;
  --warm:#ffb46b;

  /* ---- faces ----
     Cormorant carries display and title. Karla carries everything a
     person reads or clicks. PlexMono is reserved for data: measurements,
     identifiers, file sizes, hashes, dates. Not for atmosphere.        */
  --display:'Cormorant',Georgia,'Times New Roman',serif;
  --text:'Karla',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --mono:'PlexMono',ui-monospace,'SF Mono',Menlo,monospace;

  /* ---- scale. 12 / 14 / 16 / 18 then fluid above ---- */
  --t-display:clamp(2.6rem, 7.6vw, 6rem);
  --t-title:clamp(2rem, 4.4vw, 3.25rem);
  --t-head:clamp(1.5rem, 2.6vw, 1.875rem);
  --t-lead:1.125rem;
  --t-body:1rem;
  --t-small:0.875rem;
  --t-label:0.75rem;

  --nav-h:68px;
  --gut:clamp(20px,4.4vw,72px);
  --maxw:1320px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{box-sizing:border-box}

html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
  /* browser surfaces the design owns */
  color-scheme:dark;
  scrollbar-color:var(--line-mid) var(--bg-0);
  scrollbar-width:thin;
}
::-webkit-scrollbar{width:11px;height:11px}
::-webkit-scrollbar-track{background:var(--bg-0)}
::-webkit-scrollbar-thumb{background:#1d2836;border:3px solid var(--bg-0);border-radius:99px}
::-webkit-scrollbar-thumb:hover{background:#2a3a4d}

body{
  margin:0;
  background:var(--bg-0);
  color:var(--txt);
  font-family:var(--text);
  font-weight:300;
  font-size:var(--t-body);
  line-height:1.65;
  caret-color:var(--ice);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}

img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
::selection{background:rgba(63,169,245,.26);color:var(--txt-hi)}
:focus-visible{outline:1px solid var(--ice);outline-offset:3px}

/* data: identifiers, sizes, hashes, dates, prices */
.mono{
  font-family:var(--mono);font-weight:400;
  font-size:var(--t-label);letter-spacing:.1em;
  font-variant-numeric:tabular-nums;
}
.mono--caps{text-transform:uppercase;letter-spacing:.16em}

.skip{
  position:absolute;left:-9999px;top:0;z-index:100;padding:13px 18px;
  background:var(--bg-3);color:var(--txt-hi);border:1px solid var(--line-hot);
  font-size:var(--t-label);letter-spacing:.1em;
}
.skip:focus{left:var(--gut);top:12px}

/* ============================ NAV ============================ */
.nav{
  height:var(--nav-h);
  display:flex;align-items:center;
  padding:0 var(--gut);
}
.nav--sticky{position:sticky;top:0;z-index:50;background:rgba(7,10,15,.92);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line)}
.nav{position:relative}

/* Menu button appears only when the inline links no longer fit. */
.menu-btn{
  display:none;align-items:center;justify-content:center;
  width:42px;height:42px;margin-left:auto;
  border:1px solid var(--line);border-radius:2px;background:rgba(14,20,28,.55);
  color:var(--txt);transition:border-color .3s var(--ease),color .3s var(--ease);
}
.menu-btn:hover,.nav.menu-open .menu-btn{color:var(--txt-hi);border-color:var(--line-mid)}
.menu-btn svg{width:17px;height:17px}
.menu-btn .close{display:none}
.nav.menu-open .menu-btn .open{display:none}
.nav.menu-open .menu-btn .close{display:block}

.brand{display:flex;align-items:center;gap:11px;flex:0 0 auto;padding:10px 0}
.brand .mark{width:25px;height:25px;color:var(--txt-hi);transition:transform .5s var(--ease)}
.brand:hover .mark{transform:translateY(-1px)}
.brand-text{
  font-family:var(--display);font-size:1.3rem;font-weight:400;letter-spacing:.1em;
  color:var(--txt-hi);white-space:nowrap;
}

.links{display:flex;align-items:center;gap:clamp(16px,2.2vw,32px);margin-left:auto}
.links a{
  position:relative;
  font-size:var(--t-label);font-weight:400;letter-spacing:.11em;
  color:var(--txt-dim);padding:12px 0;
  transition:color .3s var(--ease);
}
.links a::after{
  content:'';position:absolute;left:0;right:100%;bottom:6px;height:1px;
  background:var(--ice);transition:right .4s var(--ease);
}
.links a:hover{color:var(--txt-hi)}
.links a:hover::after{right:0}
.links a[aria-current="page"]{color:var(--txt-hi)}
.links a[aria-current="page"]::after{right:0}

/* ============================ BUTTONS ============================ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:11px;
  padding:14px 26px;border-radius:2px;
  font-size:var(--t-label);letter-spacing:.11em;
  border:1px solid var(--line-hot);color:var(--txt-hi);
  background:rgba(63,169,245,.11);
  transition:background .3s var(--ease),border-color .3s var(--ease),color .3s var(--ease);
  -webkit-tap-highlight-color:transparent;
}
.btn .arw{transition:transform .35s var(--ease)}
.btn:hover{background:rgba(63,169,245,.21);border-color:rgba(127,227,255,.75)}
.btn:hover .arw{transform:translateX(4px)}
.btn-ghost{border-color:var(--line);background:none;color:var(--txt)}
.btn-ghost:hover{border-color:var(--line-mid);background:rgba(19,26,36,.55);color:var(--txt-hi)}
.btn-soon{border-color:var(--line);background:none;color:var(--txt-faint);cursor:default}
.btn-soon:hover{background:none;border-color:var(--line);color:var(--txt-faint)}

/* ============================ DOCUMENT ============================ */
.doc{
  max-width:min(68ch, 100%);
  margin:0 auto;
  padding:clamp(48px,7vw,88px) var(--gut) clamp(64px,9vw,120px);
}
.doc h1{
  margin:0 0 18px;
  font-family:var(--display);
  font-size:var(--t-title);
  font-weight:300;letter-spacing:-.004em;line-height:1.02;
  color:var(--txt-hi);
  text-wrap:balance;
}
.doc .updated{
  margin:0 0 clamp(34px,5vw,52px);
  padding-bottom:clamp(26px,4vw,38px);
  border-bottom:1px solid var(--line);
  font-family:var(--mono);font-size:var(--t-label);letter-spacing:.03em;
  font-variant-numeric:tabular-nums;
  color:var(--txt-faint);
}
.doc h2{
  margin:clamp(42px,5vw,60px) 0 14px;
  font-family:var(--display);
  font-size:var(--t-head);
  font-weight:400;letter-spacing:0;color:var(--txt-hi);line-height:1.15;
  text-wrap:balance;
}
/* h3 separates from h2 by face, weight and case, not by a 4% size step */
.doc h3{
  margin:34px 0 10px;
  font-family:var(--text);font-size:var(--t-small);font-weight:600;
  letter-spacing:.09em;text-transform:uppercase;color:var(--txt-hi);
}
.doc p,.doc li{font-size:var(--t-body);line-height:1.8;color:var(--txt)}
.doc p{margin:0 0 18px}
.doc ul,.doc ol{margin:0 0 18px;padding-left:22px}
.doc li{margin-bottom:10px}
.doc li::marker{color:var(--txt-faint)}
.doc strong{color:var(--txt-hi);font-weight:500}
.doc em{color:var(--txt-dim)}
.doc a:not(.btn){color:var(--ice);border-bottom:1px solid rgba(127,227,255,.3);transition:border-color .3s var(--ease)}
.doc a:not(.btn):hover{border-bottom-color:var(--ice)}
.doc code{
  font-family:var(--mono);font-size:.9em;
  background:var(--bg-2);border:1px solid var(--line);border-radius:2px;padding:1px 5px;
  color:var(--ice);
}

/* a quiet inset, not an accent rail */
.callout{
  margin:0 0 24px;
  padding:22px 24px;
  border:1px solid var(--line);
  background:var(--bg-2);
}
.callout p:last-child{margin-bottom:0}
.callout.warm{border-color:rgba(255,180,107,.24);background:#12100f}

.kv{margin:0 0 18px;padding:0;list-style:none}
.kv li{display:flex;gap:16px;flex-wrap:wrap;padding:12px 0;border-bottom:1px solid var(--line);margin:0}
.kv b{
  flex:0 0 170px;color:var(--txt-faint);font-family:var(--mono);font-weight:400;
  font-size:var(--t-label);letter-spacing:.06em;
}
.kv span{flex:1 1 260px;color:var(--txt)}

/* ============================ FOOTER ============================ */
.foot{
  border-top:1px solid var(--line);
  background:rgba(8,11,16,.72);
  padding:clamp(56px,7vw,92px) var(--gut) 34px;
}
.foot-in{
  max-width:var(--maxw);margin:0 auto;
  display:grid;
  grid-template-columns:minmax(0,2.1fr) minmax(0,.85fr) minmax(0,1.15fr);
  gap:clamp(32px,5vw,76px);
}
.foot-brand{display:flex;align-items:center;gap:10px;margin-bottom:18px}
.foot-brand .mark{width:21px;height:21px;color:var(--txt)}
.foot-brand span{font-family:var(--display);font-size:1.15rem;letter-spacing:.09em;color:var(--txt-hi)}
.foot p{margin:0 0 14px;font-size:var(--t-small);line-height:1.75;color:var(--txt-dim);max-width:38ch}
.mor{font-size:var(--t-small);line-height:1.7;color:var(--txt-faint);max-width:44ch}
.foot h2{
  margin:0 0 14px;font-family:var(--text);font-size:var(--t-label);font-weight:500;
  letter-spacing:.1em;color:var(--txt-faint);text-transform:uppercase;
}
.foot ul{list-style:none;margin:0;padding:0}
.foot li{margin-bottom:2px;font-size:var(--t-small)}
.foot li a{display:inline-block;padding:7px 0;min-height:24px;color:var(--txt-dim);transition:color .3s var(--ease)}
.foot li a:hover{color:var(--txt-hi)}
.foot .lnk{color:var(--txt)}
.foot .lnk:hover{color:var(--ice)}
.foot-cols{display:grid;grid-template-columns:1fr 1fr;gap:clamp(24px,3vw,44px)}
.foot-bot{
  max-width:var(--maxw);margin:52px auto 0;padding-top:22px;border-top:1px solid var(--line);
  display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap;
  font-size:var(--t-label);letter-spacing:.06em;color:var(--txt-faint);
}

.scroll{overflow-x:auto}

/* ============================ RESPONSIVE ============================ */
@media (max-width:1000px){
  .foot-in{grid-template-columns:1fr;gap:44px}
}
@media (max-width:760px){
  :root{--nav-h:60px}
  .brand-text{display:none}
  .menu-btn{display:flex}
  .links{
    position:absolute;top:calc(100% - 1px);right:var(--gut);left:var(--gut);
    flex-direction:column;align-items:stretch;gap:0;margin-left:0;
    padding:6px;
    border:1px solid var(--line);background:rgba(8,11,16,.98);
    backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
    opacity:0;visibility:hidden;transform:translateY(-6px);
    transition:opacity .25s var(--ease),transform .25s var(--ease),visibility .25s;
  }
  .nav.menu-open .links{opacity:1;visibility:visible;transform:none}
  .links a{padding:14px 12px;font-size:var(--t-small);letter-spacing:.03em;color:var(--txt)}
  .links a::after{display:none}
  .links a:hover,.links a[aria-current="page"]{background:rgba(63,169,245,.09);color:var(--txt-hi)}
  .foot-cols{grid-template-columns:1fr}
  .kv b{flex-basis:100%}
}

/* Reduced motion keeps state changes and hierarchy. It removes ambient
   and decorative movement only, rather than flattening every duration. */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .brand:hover .mark,.btn:hover .arw{transform:none}
  .links a::after{transition:none}
}