/* ==========================================================================
   AFSys — shared design system
   Tokens derived from Brand Assets/AFSys Logo (Keystone brand sheet).
   ========================================================================== */

:root{
  /* ---- color: surfaces ---- */
  --bg:        oklch(0.955 0.004 250);
  --bg-raise:  oklch(0.975 0.003 250);
  --card:      #ffffff;
  --dark:      oklch(0.235 0.014 260);
  --dark-2:    oklch(0.32 0.014 260);
  --dark-3:    oklch(0.29 0.014 260);

  /* ---- color: ink ---- */
  --ink:       oklch(0.24 0.012 255);
  --ink-soft:  oklch(0.46 0.012 255);
  --ink-mute:  oklch(0.62 0.010 255);
  --line:      oklch(0.90 0.005 255);
  --line-soft: oklch(0.93 0.004 255);

  --on-dark:       #ffffff;
  --on-dark-soft:  oklch(0.78 0.012 255);
  --on-dark-mute:  oklch(0.62 0.012 260);
  --on-dark-line:  oklch(0.36 0.014 260);

  /* ---- color: accents ---- */
  --blue:      oklch(0.55 0.13 250);
  --blue-dim:  oklch(0.47 0.12 250);
  --blue-tint: oklch(0.55 0.13 250 / 0.10);
  --teal:      oklch(0.55 0.13 195);
  --green:     oklch(0.55 0.12 150);
  --amber:     oklch(0.64 0.13 65);
  --amber-tint:oklch(0.64 0.13 65 / 0.12);

  /* ---- type ---- */
  --display: 'Archivo', system-ui, sans-serif;
  --body:    'IBM Plex Sans', system-ui, sans-serif;
  --mono:    'IBM Plex Mono', ui-monospace, 'SF Mono', monospace;

  /* ---- spacing scale (8px base) ---- */
  --sp-1: 4px;   --sp-2: 8px;   --sp-3: 12px;  --sp-4: 16px;
  --sp-5: 24px;  --sp-6: 32px;  --sp-7: 48px;  --sp-8: 64px;
  --sp-9: 96px;  --sp-10: 128px;

  /* ---- radius ---- */
  --r-sm: 8px; --r-md: 14px; --r-lg: 20px; --r-pill: 999px;

  /* ---- shadow: layered, tinted ---- */
  --shadow-sm: 0 1px 2px rgba(20,24,40,.05), 0 4px 14px rgba(20,24,40,.04);
  --shadow-md: 0 2px 6px rgba(20,24,40,.06), 0 16px 40px rgba(30,46,90,.09);
  --shadow-blue: 0 6px 20px oklch(0.55 0.13 250 / 0.22), 0 2px 6px oklch(0.55 0.13 250 / 0.16);

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --container: 1240px;
}

/* ---- reset ---- */
*, *::before, *::after{ box-sizing: border-box; }
html{ -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; scroll-behavior: smooth; }
body{
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.7;
}
img, svg{ display: block; max-width: 100%; }
a{ color: inherit; text-decoration: none; }
ul, ol{ margin: 0; padding: 0; list-style: none; }
h1,h2,h3,h4,p{ margin: 0; }
button{ font: inherit; color: inherit; background: none; border: none; cursor: pointer; }

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *, *::before, *::after{ animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

:focus-visible{
  outline: 2px solid var(--blue);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---- layout ---- */
.wrap{ max-width: var(--container); margin: 0 auto; padding: 0 var(--sp-6); }
@media (max-width: 640px){ .wrap{ padding: 0 var(--sp-5); } }

.section{ padding: var(--sp-9) 0; }
.section-tight{ padding: var(--sp-7) 0; }
.section-dark{ background: var(--dark); color: var(--on-dark); }
@media (max-width: 640px){ .section{ padding: var(--sp-7) 0; } }

/* ---- typography ---- */
.eyebrow{
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-mute);
  display: flex;
  align-items: center;
  gap: var(--sp-4);
}
.eyebrow::after{ content:""; height: 1px; flex: 1; background: var(--line); min-width: var(--sp-6); }
.eyebrow.no-rule::after{ display:none; }
.section-dark .eyebrow{ color: var(--on-dark-mute); }
.section-dark .eyebrow::after{ background: var(--on-dark-line); }

h1, .h1{
  font-family: var(--display);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.02;
  font-size: clamp(40px, 5.4vw, 68px);
  margin-top: var(--sp-5);
}
h2, .h2{
  font-family: var(--display);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.08;
  font-size: clamp(30px, 3.4vw, 42px);
}
h3, .h3{
  font-family: var(--display);
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.2;
  font-size: 22px;
}
.lede{
  font-size: 18px;
  line-height: 1.65;
  color: var(--ink-soft);
  max-width: 640px;
  margin-top: var(--sp-5);
}
.section-dark .lede{ color: var(--on-dark-soft); }
p.body-text{ color: var(--ink-soft); line-height: 1.75; }
.section-dark p.body-text{ color: var(--on-dark-soft); }

.mono{ font-family: var(--mono); }
.text-blue{ color: var(--blue); }

/* keystone bullet — recurring signature mark used everywhere a list needs a marker */
.kw-list{ display: flex; flex-direction: column; gap: var(--sp-4); }
.kw-list li{ display: flex; align-items: flex-start; gap: var(--sp-3); font-size: 15px; line-height: 1.6; color: var(--ink-soft); }
.section-dark .kw-list li{ color: var(--on-dark-soft); }
.kw-list li::before{
  content: "";
  flex: none;
  width: 8px; height: 8px;
  margin-top: 7px;
  background: var(--blue);
  clip-path: polygon(22% 0, 78% 0, 62% 100%, 38% 100%);
}

/* ---- buttons ---- */
.btn{
  display: inline-flex;
  align-items: center;
  gap: var(--sp-3);
  font-family: var(--body);
  font-weight: 600;
  font-size: 15px;
  padding: 13px 26px;
  border-radius: var(--r-sm);
  transition: transform .35s var(--ease), box-shadow .35s var(--ease), background-color .25s var(--ease), border-color .25s var(--ease), opacity .25s var(--ease);
  white-space: nowrap;
}
.btn:active{ transform: translateY(1px) scale(0.99); }

.btn-primary{
  background: var(--blue);
  color: #fff;
  box-shadow: var(--shadow-blue);
}
.btn-primary:hover{ background: var(--blue-dim); transform: translateY(-2px); box-shadow: 0 10px 28px oklch(0.55 0.13 250 / 0.28), 0 3px 8px oklch(0.55 0.13 250 / 0.18); }
.btn-primary:focus-visible{ outline-offset: 3px; }

.btn-ghost{
  background: transparent;
  color: var(--ink);
  border: 1.5px solid var(--line);
}
.btn-ghost:hover{ border-color: var(--ink-mute); transform: translateY(-2px); background: var(--bg-raise); }
.section-dark .btn-ghost{ color: #fff; border-color: var(--on-dark-line); }
.section-dark .btn-ghost:hover{ border-color: var(--on-dark-mute); background: rgba(255,255,255,.04); }

.btn-ghost-dark{
  background: transparent;
  color: #fff;
  border: 1.5px solid var(--on-dark-line);
}
.btn-ghost-dark:hover{ border-color: var(--on-dark-mute); background: rgba(255,255,255,.05); transform: translateY(-2px); }

.arrow{ transition: transform .35s var(--ease); }
.btn:hover .arrow, .link-arrow:hover .arrow{ transform: translateX(3px); }

.link-arrow{
  display: inline-flex; align-items: center; gap: var(--sp-2);
  font-family: var(--mono); font-size: 13px; font-weight: 500;
  letter-spacing: 0.04em; color: var(--blue);
  padding-bottom: 2px; border-bottom: 1px solid transparent;
  transition: border-color .3s var(--ease);
}
.link-arrow:hover{ border-color: var(--blue); }

/* ---- cards & surfaces ---- */
.card{
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-sm);
}
.card-dark{
  background: var(--dark-3);
  border: 1px solid var(--on-dark-line);
  border-radius: var(--r-md);
}
.card-raise{
  transition: transform .4s var(--ease), box-shadow .4s var(--ease), border-color .3s var(--ease);
}
.card-raise:hover{ transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--line-soft); }

.tag-chip{
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  background: var(--bg-raise);
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  padding: 7px 14px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.section-dark .tag-chip{ background: var(--dark-3); border-color: var(--on-dark-line); color: var(--on-dark-soft); }
.tag-row{ display: flex; flex-wrap: wrap; gap: var(--sp-3); }

.callout{
  border-left: 3px solid var(--amber);
  background: var(--amber-tint);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  padding: var(--sp-5) var(--sp-6);
}
.callout p{ color: var(--ink); }
.callout .eyebrow{ color: oklch(0.5 0.13 65); }
.callout .eyebrow::after{ background: oklch(0.64 0.13 65 / 0.35); }
.section-dark .callout{ background: oklch(0.64 0.13 65 / 0.13); border-left-color: var(--amber); }
.section-dark .callout p{ color: var(--on-dark-soft); }
.section-dark .callout .eyebrow{ color: oklch(0.74 0.12 65); }
.section-dark .callout .eyebrow::after{ background: oklch(0.64 0.13 65 / 0.3); }

/* ---- nav ---- */
.nav{
  position: sticky;
  top: 0;
  z-index: 50;
  background: oklch(0.955 0.004 250 / 0.82);
  backdrop-filter: blur(10px) saturate(1.4);
  -webkit-backdrop-filter: blur(10px) saturate(1.4);
  border-bottom: 1px solid var(--line);
}
.nav-inner{
  max-width: var(--container);
  margin: 0 auto;
  padding: 18px var(--sp-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-6);
}
.brand{ display: flex; align-items: center; gap: 11px; flex: none; }
.brand svg{ color: var(--blue); flex: none; }
.brand-word{ font-family: var(--display); font-weight: 800; font-size: 18px; letter-spacing: -0.01em; color: var(--ink); }
.brand-word span{ color: var(--ink-mute); font-weight: 600; }

.nav-links{ display: flex; align-items: center; gap: var(--sp-7); }
.nav-links a{
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  position: relative;
  padding: 4px 0;
  transition: color .25s var(--ease);
}
.nav-links a:hover{ color: var(--ink); }
.nav-links a::after{
  content: ""; position: absolute; left: 0; right: 100%; bottom: -2px; height: 2px;
  background: var(--blue); transition: right .3s var(--ease);
}
.nav-links a:hover::after, .nav-links a[aria-current="page"]::after{ right: 0; }
.nav-links a[aria-current="page"]{ color: var(--ink); }

.nav-cta{ display: flex; align-items: center; gap: var(--sp-5); }
.nav-toggle{ display: none; flex: none; width: 40px; height: 40px; align-items: center; justify-content: center; }
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after{
  content: ""; display: block; width: 20px; height: 1.6px; background: var(--ink);
  transition: transform .3s var(--ease), opacity .3s var(--ease);
  position: relative;
}
.nav-toggle span::before{ position: absolute; top: -6px; }
.nav-toggle span::after{ position: absolute; top: 6px; }
.nav-toggle[aria-expanded="true"] span{ background: transparent; }
.nav-toggle[aria-expanded="true"] span::before{ transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span::after{ transform: translateY(-6px) rotate(-45deg); }

@media (max-width: 860px){
  .nav-links{
    position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: flex-start; gap: var(--sp-5);
    background: var(--card); border-bottom: 1px solid var(--line);
    padding: var(--sp-6); box-shadow: var(--shadow-md);
    max-height: 0; overflow: hidden; opacity: 0;
    transition: max-height .35s var(--ease), opacity .3s var(--ease);
  }
  .nav-links.open{ max-height: 400px; opacity: 1; }
  .nav-toggle{ display: flex; }
  .nav-cta .btn-primary{ padding: 10px 18px; font-size: 13.5px; }
}

/* ---- footer ---- */
.footer{ background: var(--dark); color: var(--on-dark); padding: var(--sp-9) 0 var(--sp-6); }
.footer-top{ display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: var(--sp-7); padding-bottom: var(--sp-8); }
@media (max-width: 860px){ .footer-top{ grid-template-columns: 1fr 1fr; row-gap: var(--sp-7); } }
@media (max-width: 560px){ .footer-top{ grid-template-columns: 1fr; } }
.footer h4{
  font-family: var(--mono); font-size: 11px; font-weight: 600; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--on-dark-mute); margin-bottom: var(--sp-4);
}
.footer-links{ display: flex; flex-direction: column; gap: var(--sp-3); }
.footer-links a, .footer-links span{ font-size: 14.5px; color: var(--on-dark-soft); transition: color .25s var(--ease); }
.footer-links a:hover{ color: #fff; }
.footer-desc{ font-size: 14.5px; line-height: 1.7; color: var(--on-dark-soft); max-width: 320px; margin-top: var(--sp-4); }
.footer-bottom{
  border-top: 1px solid var(--on-dark-line);
  padding-top: var(--sp-6);
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: var(--sp-4);
  font-family: var(--mono); font-size: 12px; color: var(--on-dark-mute); letter-spacing: 0.02em;
}

/* ---- grids ---- */
.grid-3{ display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-6); }
.grid-2{ display: grid; grid-template-columns: 1fr 1fr; gap: var(--sp-7); }
.grid-5{ display: grid; grid-template-columns: repeat(5, 1fr); gap: var(--sp-5); }
@media (max-width: 860px){
  .grid-3{ grid-template-columns: 1fr; }
  .grid-2{ grid-template-columns: 1fr; gap: var(--sp-6); }
  .grid-5{ grid-template-columns: 1fr 1fr; gap: var(--sp-6) var(--sp-5); }
}
@media (max-width: 520px){ .grid-5{ grid-template-columns: 1fr; } }

/* ---- reveal-on-scroll ----
   Content is visible by default (no-JS, slow-JS and crawler safe).
   JS opts elements below the fold into a hidden '.pre' state, then reveals
   them on intersection — with a timeout fallback so nothing stays hidden. */
.reveal{ opacity: 1; transform: none; }
.reveal.pre{ opacity: 0; transform: translateY(18px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.pre.in{ opacity: 1; transform: translateY(0); }

/* ---- hero arch ---- */
.arch-wrap{ position: relative; display: flex; justify-content: center; color: var(--blue); }
.arch-svg{ width: 100%; max-width: 900px; height: auto; overflow: visible; }

/* ---- page hero shared ---- */
.page-hero{ padding: var(--sp-9) 0 var(--sp-8); }
.page-hero .lede{ max-width: 700px; }

/* ---- utility ---- */
.center{ text-align: center; margin-left: auto; margin-right: auto; }
.mt-1{ margin-top: var(--sp-5); } .mt-2{ margin-top: var(--sp-7); } .mt-3{ margin-top: var(--sp-9); }
.flex-row{ display: flex; align-items: center; gap: var(--sp-5); flex-wrap: wrap; }
.divider{ height: 1px; background: var(--line); border: none; margin: 0; }
.section-dark .divider{ background: var(--on-dark-line); }