/* ============================================================
   Ryklin Group — shared chrome
   Tokens, type, nav, telemetry, footer + small utilities.
   Lifted directly from index.html so all sub-pages match.
   ============================================================ */

:root {
  --surface: #FAF8F3;
  --ink: #1A1F2B;
  --ink-soft: rgba(26,31,43,0.62);
  --ink-faint: rgba(26,31,43,0.38);
  --rule: rgba(26,31,43,0.14);
  --rule-strong: rgba(26,31,43,0.28);
  --accent: #7C1E2A;
  --accent-soft: rgba(124,30,42,0.10);
  --accent-wash: rgba(124,30,42,0.06);
  --pulse: #2E7D5B;

  --max: 1280px;
  --gutter: 48px;
  --u: 8px;

  --ease: cubic-bezier(0.215, 0.61, 0.355, 1);
  --dur: 240ms;

  --f-display: "Newsreader", "Times New Roman", Georgia, serif;
  --f-ui: "Inter", system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  --f-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
}
[data-theme="night"] {
  --surface: #0F1115;
  --ink: #EAE3D2;
  --ink-soft: rgba(234,227,210,0.62);
  --ink-faint: rgba(234,227,210,0.36);
  --rule: rgba(234,227,210,0.14);
  --rule-strong: rgba(234,227,210,0.28);
  --accent: #9B2A36;
  --accent-soft: rgba(155,42,54,0.18);
  --accent-wash: rgba(155,42,54,0.10);
  --pulse: #4FB585;
}

@media (max-width: 720px){
  :root { --gutter: 24px; }
}

/* Reset-ish */
*,*::before,*::after{ box-sizing: border-box; }
html,body{ margin:0; padding:0; overflow-x: hidden; }
html { color-scheme: light; -webkit-text-size-adjust: 100%; }
[data-theme="night"] html, html[data-theme="night"] { color-scheme: dark; }
body{
  background: var(--surface);
  color: var(--ink);
  font-family: var(--f-ui);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "ss01","ss02","cv11";
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
  min-width: 0;
}
/* Mobile: tighter sticky-nav so vertical real estate isn't stolen */
@media (max-width: 720px){
  .nav-row{ height: 60px; gap: 14px; }
  .brand{ font-size: 18px; }
  .brand .mark{ width: 18px; height: 18px; }
  .nav-panel{ top: 60px; max-height: calc(100vh - 60px); }
}
img{ max-width:100%; display:block; }
a{ color: inherit; text-decoration: none; }
button{ font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

::selection{ background: var(--accent); color: var(--surface); }

.shell{
  max-width: var(--max);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

/* Type */
.serif{ font-family: var(--f-display); font-weight: 400; letter-spacing: -0.012em; }
.mono { font-family: var(--f-mono); font-feature-settings: "tnum","zero"; }
.eyebrow{
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.rule{ height:1px; background: var(--rule); width: 100%; }

/* Nav */
.nav{
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in oklab, var(--surface) 92%, transparent);
  backdrop-filter: saturate(120%) blur(8px);
  border-bottom: 1px solid var(--rule);
}
.nav .shell{ max-width: none; padding-left: var(--gutter); padding-right: var(--gutter); }
.nav-row{ display: flex; align-items: center; gap: 24px; height: 72px; }
.brand{ display:flex; align-items: baseline; gap: 8px; font-family: var(--f-display); font-size: 22px; letter-spacing: -0.02em; margin-right: auto; }
.brand .mark{
  display: inline-block;
  width: 22px; height: 22px;
  position: relative; top: 4px;
  margin-right: 6px;
  background: transparent url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 64 64'><path d='M 16 8 Q 48 20, 16 32 Q 48 44, 16 56' fill='none' stroke='%239B2A36' stroke-width='3.5' stroke-linecap='round'/><path d='M 48 8 Q 16 20, 48 32 Q 16 44, 48 56' fill='none' stroke='%239B2A36' stroke-width='3.5' stroke-linecap='round'/><line x1='22' y1='14' x2='42' y2='14' stroke='%239B2A36' stroke-width='2.5' stroke-linecap='round'/><line x1='22' y1='26' x2='42' y2='26' stroke='%239B2A36' stroke-width='2.5' stroke-linecap='round'/><line x1='22' y1='38' x2='42' y2='38' stroke='%239B2A36' stroke-width='2.5' stroke-linecap='round'/><line x1='22' y1='50' x2='42' y2='50' stroke='%239B2A36' stroke-width='2.5' stroke-linecap='round'/></svg>") no-repeat center / contain;
  transform: none;
}
.brand .mark::before{ content: ""; }
.nav-links{ display:flex; gap: 28px; margin-left: 0; font-size: 14px; color: var(--ink-soft); }
.nav-links a{ position: relative; padding: 6px 0; transition: color var(--dur) var(--ease); }
.nav-links a:hover, .nav-links a[aria-current="page"]{ color: var(--ink); }
.nav-links a::after{
  content:""; position:absolute; left:0; right:0; bottom:-1px; height:1px;
  background: var(--accent); transform: scaleX(0); transform-origin: left;
  transition: transform var(--dur) var(--ease);
}
.nav-links a:hover::after, .nav-links a:focus-visible::after, .nav-links a[aria-current="page"]::after{ transform: scaleX(1); }
.nav-spacer{ flex:1; }
.theme-toggle{
  width: 40px; height: 28px; border:1px solid var(--rule-strong); border-radius: 999px;
  position: relative; padding: 0 4px; display: inline-flex; align-items: center;
  transition: border-color var(--dur) var(--ease);
}
.theme-toggle:hover{ border-color: var(--ink-soft); }
.theme-toggle .knob{ width: 20px; height: 20px; border-radius: 50%; background: var(--ink); transform: translateX(0); transition: transform var(--dur) var(--ease), background var(--dur) var(--ease); }
[data-theme="night"] .theme-toggle .knob{ transform: translateX(12px); background: var(--accent); }
.cta{
  font-size: 13px; letter-spacing: 0.02em; font-weight: 500;
  border: 1px solid var(--ink); padding: 10px 16px;
  display: inline-flex; align-items: center; gap: 10px;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.cta:hover{ background: var(--ink); color: var(--surface); }
.cta.primary{ background: var(--accent); border-color: var(--accent); color: #FAF8F3; }
.cta.primary:hover{ background: var(--ink); border-color: var(--ink); color: var(--surface); }
.cta .arrow{ display:inline-block; transition: transform var(--dur) var(--ease); }
.cta:hover .arrow{ transform: translateX(3px); }
.cta.ghost{ border-color: var(--rule-strong); color: var(--ink); }
.cta.ghost:hover{ background: transparent; color: var(--ink); border-color: var(--ink); }

/* Hamburger nav toggle (Bain-style: left of brand, borderless) */
.nav-toggle{
  width: 30px; height: 22px; padding: 0;
  display: inline-flex; flex-direction: column; justify-content: space-between; align-items: stretch;
  border: 0; background: transparent; cursor: pointer;
  margin-right: 14px;
  position: relative;
}
.nav-toggle:hover span{ background: var(--accent); }
.nav-toggle span{
  display: block; width: 100%; height: 2px; background: var(--ink);
  transition: transform 220ms var(--ease), opacity 180ms var(--ease), background var(--dur) var(--ease);
  transform-origin: center;
  border-radius: 1px;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1){ transform: translateY(10px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2){ opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3){ transform: translateY(-10px) rotate(-45deg); }

/* Slide-down nav panel */
.nav-panel{
  position: fixed; top: 72px; left: 0; right: 0; z-index: 49;
  background: var(--surface);
  border-bottom: 1px solid var(--rule);
  transform: translateY(-110%); pointer-events: none;
  transition: transform 280ms var(--ease);
  max-height: calc(100vh - 72px); overflow-y: auto;
}
.nav-panel[data-open="true"]{ transform: translateY(0); pointer-events: auto; }
.nav-panel-list{
  list-style: none; padding: 8px var(--gutter) 16px; margin: 0;
  display: grid; gap: 0;
}
.nav-panel-list li{ border-bottom: 1px solid var(--rule); }
.nav-panel-list li:last-child{ border-bottom: 0; }
.nav-panel-list a{
  display: grid; grid-template-columns: 44px 1fr auto;
  gap: 18px; align-items: baseline;
  padding: 22px 4px; color: var(--ink);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.nav-panel-list a:hover{ background: color-mix(in oklab, var(--accent-wash) 60%, transparent); color: var(--accent); }
.nav-panel-list .npk{
  font-family: var(--f-mono); font-size: 10px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--accent);
  align-self: center;
}
.nav-panel-list .npn{
  font-family: var(--f-display); font-size: clamp(20px, 3vw, 28px);
  letter-spacing: -0.012em; line-height: 1.1;
}
.nav-panel-list .npm{
  font-family: var(--f-mono); font-size: 10.5px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--ink-faint); align-self: center;
}

@media (max-width: 860px){
  .nav-links{ display:none; }
  .nav-row .cta:not(.primary){ display:none; }
  .theme-toggle{ display: none; }
}

/* Telemetry strip */
.telemetry{
  border-bottom: 1px solid var(--rule);
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}
.telemetry .row{ display:flex; align-items:center; gap: 14px; padding: 10px 0; flex-wrap: wrap; }
.pulse{
  width:8px; height:8px; border-radius: 50%;
  background: var(--pulse);
  box-shadow: 0 0 0 0 color-mix(in oklab, var(--pulse) 60%, transparent);
  animation: pulse 2.4s var(--ease) infinite;
}
@keyframes pulse{
  0%{ box-shadow: 0 0 0 0 color-mix(in oklab, var(--pulse) 50%, transparent); }
  70%{ box-shadow: 0 0 0 8px transparent; }
  100%{ box-shadow: 0 0 0 0 transparent; }
}
.telemetry .sep{ color: var(--ink-faint); }
.telemetry .right{ margin-left: auto; color: var(--ink-faint); }

/* Page hero (sub-page) */
.page-hero{ padding: 88px 0 72px; }
.page-hero .crumbs{
  display: flex; gap: 12px; align-items: center;
  font-family: var(--f-mono); font-size: 11px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--ink-faint);
  margin-bottom: 28px;
}
.page-hero .crumbs a{ color: var(--ink-soft); }
.page-hero .crumbs a:hover{ color: var(--ink); }
.page-hero .crumbs .sep{ color: var(--ink-faint); }
.page-hero h1{
  font-family: var(--f-display); font-weight: 400;
  font-size: clamp(40px, 6vw, 76px);
  line-height: 1.04;
  letter-spacing: -0.024em;
  margin: 0;
  max-width: 22ch;
  text-wrap: balance;
}
.page-hero h1 em{ font-style: italic; font-weight: 500; }
.page-hero h1 .accent{ color: var(--accent); font-style: italic; font-weight: 500; }
.page-hero .dek{
  margin: 28px 0 0; font-size: 18px; color: var(--ink-soft);
  max-width: 60ch; line-height: 1.55;
}
.page-hero .dek strong{ color: var(--ink); font-weight: 500; }
.page-hero-grid{
  display: grid; grid-template-columns: 1.6fr 1fr; gap: 56px; align-items: start;
}
.page-hero-meta{
  border-left: 1px solid var(--rule); padding-left: 24px;
  display: flex; flex-direction: column; gap: 22px;
  font-family: var(--f-mono); font-size: 11px; letter-spacing: 0.08em;
  color: var(--ink-soft); align-self: center;
}
.page-hero-meta dt{ color: var(--ink-faint); text-transform: uppercase; }
.page-hero-meta dd{ margin: 4px 0 0; color: var(--ink); }
@media (max-width: 860px){
  .page-hero{ padding: 56px 0; }
  .page-hero-grid{ grid-template-columns: 1fr; gap: 32px; }
  .page-hero-meta{ border-left:0; border-top:1px solid var(--rule); padding: 24px 0 0; flex-direction: row; flex-wrap: wrap; gap: 28px; }
}

/* Continue card (cross-page nav) */
.continue{
  border-top: 1px solid var(--rule); padding: 64px 0 96px;
}
.continue-grid{
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 0;
  grid-auto-rows: 1fr;
  border: 1px solid var(--rule);
  align-items: stretch;
}
.continue-card{
  padding: 28px 28px 32px;
  border-right: 1px solid var(--rule);
  display: grid; grid-template-rows: auto auto 1fr auto;
  gap: 12px; min-height: 200px;
  transition: background var(--dur) var(--ease);
}
.continue-card:last-child{ border-right: 0; }
.continue-card:hover{ background: color-mix(in oklab, var(--accent-wash) 60%, transparent); }
.continue-card .k{ font-family: var(--f-mono); font-size: 10.5px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-faint); }
.continue-card h3{ font-family: var(--f-display); font-weight: 400; font-size: 26px; letter-spacing: -0.016em; margin: 4px 0 0; line-height: 1.15; }
.continue-card p{ font-size: 14.5px; color: var(--ink-soft); margin: 0; line-height: 1.5; max-width: 32ch; }
.continue-card .arrow-link{
  margin-top: 20px; align-self: end;
  font-family: var(--f-mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent);
  display: inline-flex; gap: 10px; align-items: center;
}
.continue-card .arrow-link .arrow{ transition: transform var(--dur) var(--ease); display:inline-block; }
.continue-card:hover .arrow-link .arrow{ transform: translateX(4px); }
@media (max-width: 860px){
  .continue-grid{ grid-template-columns: 1fr; }
  .continue-card{ border-right: 0; border-bottom: 1px solid var(--rule); }
  .continue-card:last-child{ border-bottom: 0; }
}

/* Footer (matches index.html) */
.footer{
  border-top: 1px solid var(--rule);
  padding: 56px 0 32px;
  font-size: 13px; color: var(--ink-soft);
}
.footer-grid{ display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 48px; }
.footer h4{ font-family: var(--f-mono); font-size: 10px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-faint); margin: 0 0 16px; font-weight: 500; }
.footer ul{ list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; }
.footer ul a:hover{ color: var(--ink); }
.footer .colophon{
  display: flex; gap: 16px; align-items: center; padding: 28px 0 0; margin-top: 48px;
  border-top: 1px solid var(--rule);
  font-family: var(--f-mono); font-size: 11px; letter-spacing: 0.10em;
  color: var(--ink-faint); flex-wrap: wrap;
}
.footer .colophon .right{ margin-left: auto; }
.footer .brand{ margin-bottom: 14px; font-size: 18px; }
.footer .blurb{ max-width: 36ch; }
@media (max-width: 860px){ .footer-grid{ grid-template-columns: 1fr 1fr; gap: 32px; } }

/* Reduced motion */
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .pulse{ animation: none; box-shadow: none; }
}

/* Focus */
:focus-visible{ outline: 2px solid var(--accent); outline-offset: 3px; }
button:focus-visible, a:focus-visible{ outline-offset: 4px; }

/* Section heads (shared) */
.section-head{ padding: 56px 0 40px; max-width: 60ch; }
.section-head h2{
  font-family: var(--f-display); font-weight: 400;
  font-size: clamp(32px, 3.6vw, 48px);
  letter-spacing: -0.02em; line-height: 1.1; margin: 8px 0 0;
  text-wrap: balance;
}