/* ============================================================
   Cirronova — global styles.
   Design DNA (from the Claude design prototype): bg #0B0B0D,
   paper #ECE8E0, brass accent #C6B187, Archivo Expanded display,
   Spectral body, Space Mono labels.
   One-off layout styling lives inline in index.html; recurring
   interactive components (nav, buttons, pillars, diagram nodes,
   mobile menu) live here so hover/focus/active states stay in CSS.
   ============================================================ */

:root { --cn-accent: #C6B187; color-scheme: dark; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: #0B0B0D;
  color: #C7C6C4;
  font-family: 'Spectral', Georgia, serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
::selection { background: var(--cn-accent); color: #0B0B0D; }
@keyframes cn-cue {
  0%, 100% { transform: translateY(0); opacity: .5; }
  50% { transform: translateY(7px); opacity: 1; }
}
a { color: inherit; }

/* "Archivo Expanded" is NOT loadable from Google Fonts (every request 404s; it
   only exists as the width axis of the base Archivo variable font, or as these
   separate static files). We self-host the genuine Omnibus-Type static fonts so
   the inline `font-family:'Archivo'` and `font-family:'Archivo Expanded'`
   resolve to the real typefaces. */
@font-face {
  font-family: 'Archivo';
  font-style: normal; font-weight: 600; font-display: swap;
  src: url('fonts/Archivo-SemiBold.woff2') format('woff2');
}
@font-face {
  font-family: 'Archivo';
  font-style: normal; font-weight: 700; font-display: swap;
  src: url('fonts/Archivo-Bold.woff2') format('woff2');
}
@font-face {
  font-family: 'Archivo Expanded';
  font-style: normal; font-weight: 700; font-display: swap;
  src: url('fonts/ArchivoExpanded-Bold.woff2') format('woff2');
}
@font-face {
  font-family: 'Archivo Expanded';
  font-style: normal; font-weight: 800; font-display: swap;
  src: url('fonts/ArchivoExpanded-ExtraBold.woff2') format('woff2');
}

/* --- Keyboard focus ------------------------------------------------------ */
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--cn-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* --- Nav (desktop links + accent CTA) ------------------------------------ */
.nav-links { display: flex; align-items: center; gap: clamp(16px, 2.8vw, 38px); }
.nav-link {
  display: flex; align-items: center; gap: 6px; text-decoration: none;
  font-family: 'Space Mono', monospace; font-size: 12px;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: #83838A; transition: color .3s;
}
.nav-link:hover, .nav-link.is-on { color: #F5F3EE; }
.navdot {
  width: 4px; height: 4px; border-radius: 50%;
  background: var(--cn-accent); opacity: 0; transition: opacity .3s;
}
.nav-link.is-on .navdot { opacity: 1; }
.nav-cta {
  font-family: 'Space Mono', monospace; font-size: 12px;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: #0B0B0D; background: #F5F3EE; padding: 9px 16px;
  border-radius: 2px; text-decoration: none; transition: background .3s;
}
.nav-cta:hover { background: var(--cn-accent); }

/* --- Hamburger (mobile only) --------------------------------------------- */
.burger {
  display: none; flex-direction: column; justify-content: center;
  align-items: center; gap: 5px; width: 40px; height: 40px;
  padding: 0; background: transparent; border: none; cursor: pointer;
}
.burger span {
  display: block; width: 20px; height: 1.5px; background: #F5F3EE;
  transition: transform .3s ease, opacity .3s ease;
}
.burger.is-open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.burger.is-open span:nth-child(2) { opacity: 0; }
.burger.is-open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* --- Mobile menu drawer --------------------------------------------------- */
.nav-menu {
  position: fixed; inset: 0; z-index: 110;
  background: rgba(11, 11, 13, 0.96);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  display: flex; flex-direction: column; justify-content: center;
  padding: 96px clamp(24px, 7vw, 48px) 48px;
  opacity: 0; visibility: hidden;
  transition: opacity .35s ease, visibility 0s linear .35s;
}
.nav-menu.is-open { opacity: 1; visibility: visible; transition: opacity .35s ease; }
.menu-link {
  display: flex; align-items: baseline; gap: 16px; padding: 18px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08); text-decoration: none;
  font-family: 'Archivo Expanded', sans-serif; font-weight: 800;
  font-size: clamp(1.6rem, 7vw, 2.4rem); letter-spacing: -0.01em;
  color: #F5F3EE; transition: color .3s;
}
.menu-link:hover { color: var(--cn-accent); }
.menu-num {
  font-family: 'Space Mono', monospace; font-size: 12px;
  letter-spacing: 0.1em; color: var(--cn-accent); flex: none;
}
.menu-mail {
  margin-top: 32px; text-decoration: none;
  font-family: 'Space Mono', monospace; font-size: 12px;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: #83838A; transition: color .3s;
}
.menu-mail:hover { color: #F5F3EE; }

/* --- CTAs ------------------------------------------------------------------ */
.btn-solid {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: 'Space Mono', monospace; font-size: 13px;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: #0B0B0D; background: #F5F3EE; padding: 15px 24px;
  border-radius: 2px; text-decoration: none;
  transition: background .3s, transform .3s;
}
.btn-solid:hover, .btn-solid:focus-visible { background: var(--cn-accent); transform: translateY(-2px); }
.btn-line {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: 'Space Mono', monospace; font-size: 13px;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: #C7C6C4; padding: 15px 8px; text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.25);
  transition: color .3s, border-color .3s;
}
.btn-line:hover, .btn-line:focus-visible { color: #F5F3EE; border-color: var(--cn-accent); }
.btn-accent {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: 'Space Mono', monospace; font-size: 13px;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: #0B0B0D; background: var(--cn-accent); padding: 15px 24px;
  border-radius: 2px; text-decoration: none;
  transition: transform .3s, filter .3s;
}
.btn-accent:hover, .btn-accent:focus-visible { transform: translateY(-2px); filter: brightness(1.08); }
.badge {
  font-family: 'Space Mono', monospace; font-size: 11px;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--cn-accent); border: 1px solid rgba(198, 177, 135, 0.45);
  padding: 6px 10px; border-radius: 2px;
}

/* --- Kyberion pillars ------------------------------------------------------ */
/* Explicit column counts (not auto-fit) so the fifth card can span the
   remainder of its row at every width instead of leaving an empty cell. */
.pillar-grid {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 1px;
  margin-top: clamp(48px, 8vh, 80px);
  background: rgba(255, 255, 255, 0.08); border: 1px solid rgba(255, 255, 255, 0.08);
}
.pillar {
  background: #0B0B0D; padding: clamp(24px, 3vw, 36px);
  display: flex; flex-direction: column; gap: 14px;
  min-height: 210px; transition: background .4s ease;
}
.pillar:hover { background: #121216; }
@media (max-width: 1220px) {
  .pillar-grid { grid-template-columns: repeat(3, 1fr); }
  .pillar:last-child { grid-column: span 2; }
}

/* --- Runtime diagram nodes ------------------------------------------------- */
.node {
  appearance: none; background: transparent; border: none; cursor: pointer;
  text-align: left; padding: 0; display: flex; flex-direction: column; gap: 14px;
}
.node-dot {
  width: 13px; height: 13px; border-radius: 50%;
  border: 1px solid #0B0B0D; background: #2A2A2E;
  transition: background .35s ease, box-shadow .35s ease;
}
.node-num {
  font-family: 'Space Mono', monospace; font-size: 11px;
  letter-spacing: 0.1em; color: #7D7D84; transition: color .35s ease;
}
.node-label {
  font-family: 'Archivo', sans-serif; font-weight: 600;
  font-size: clamp(12px, 1.2vw, 15px); letter-spacing: -0.01em;
  color: #7A7A7E; transition: color .35s ease;
}
.node.is-active .node-dot { background: var(--cn-accent); box-shadow: 0 0 0 4px rgba(198, 177, 135, 0.16); }
.node.is-active .node-num { color: var(--cn-accent); }
.node.is-active .node-label { color: #F5F3EE; }

/* --- Contact + footer links ------------------------------------------------ */
.mail-link {
  display: inline-flex; align-items: center; gap: 14px; margin-top: 44px;
  font-family: 'Archivo', sans-serif; font-weight: 600;
  font-size: clamp(20px, 2.6vw, 32px); letter-spacing: -0.01em;
  color: #F5F3EE; text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.25);
  padding-bottom: 8px; transition: border-color .3s;
}
.mail-link:hover, .mail-link:focus-visible { border-color: var(--cn-accent); }
.foot-link {
  font-family: 'Space Mono', monospace; font-size: 11px;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: #83838A; text-decoration: none; transition: color .3s;
}
.foot-link:hover { color: #F5F3EE; }

/* --- Responsive ------------------------------------------------------------ */
@media (max-width: 760px) {
  #cn-nav { padding-left: 18px !important; padding-right: 18px !important; }
  .nav-links { display: none; }
  .burger { display: flex; }
  [data-cue] { display: none !important; }
  [data-flowline] { display: none !important; }
  [data-flownodes] { grid-template-columns: repeat(3, 1fr) !important; row-gap: 20px; column-gap: 12px; }
  /* With the flowline hidden there's no need for the vertical dot/num/label
     stack — lay each stage out as a horizontal row instead. */
  .node { flex-direction: row; align-items: center; gap: 10px; }
  .node-dot { flex: none; }
  /* Pillar cards: number and title share a line, description below;
     hug content instead of stretching to the desktop card height. */
  .pillar-grid { grid-template-columns: repeat(2, 1fr); }
  .pillar:last-child { grid-column: 1 / -1; }
  .pillar { display: grid; grid-template-columns: auto 1fr; align-items: baseline; column-gap: 12px; row-gap: 10px; min-height: 0; }
  .pillar p { grid-column: 1 / -1; margin: 0 !important; }
}
@media (max-width: 520px) {
  /* At the base clamp floor (2.9rem) the word "intelligence," in Archivo
     Expanded is wider than a phone viewport — scale with vw below 520px. */
  #index h1 { font-size: clamp(1.9rem, 9.2vw, 2.9rem) !important; }
  .pillar-grid { grid-template-columns: 1fr; }
  [data-flownodes] { grid-template-columns: repeat(2, 1fr) !important; }
  [data-flowdetail] { grid-template-columns: 1fr !important; align-items: start !important; gap: 14px !important; }
}
@media (max-width: 400px) {
  #cn-nav [data-wordmark] { font-size: 12px !important; letter-spacing: 0.14em !important; }
}

/* --- Reduced motion --------------------------------------------------------
   main.js already freezes the hero canvas, disables diagram autoplay, and
   skips scroll reveals when this matches; CSS covers the rest. */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  [data-cue] svg { animation: none !important; }
  .nav-menu { transition: none; }
  .burger span { transition: none; }
  .btn-solid, .btn-accent { transition: background .3s, filter .3s; }
  .btn-solid:hover, .btn-solid:focus-visible,
  .btn-accent:hover, .btn-accent:focus-visible { transform: none; }
}

/* Accessibility helper for the skip link (visually hidden until focused). */
.skip-link {
  position: fixed; top: 8px; left: 8px; z-index: 300;
  transform: translateY(-160%);
  background: #F5F3EE; color: #0B0B0D;
  font-family: 'Space Mono', monospace; font-size: 12px;
  letter-spacing: 0.12em; text-transform: uppercase;
  text-decoration: none; padding: 10px 16px; border-radius: 2px;
  transition: transform .2s ease;
}
.skip-link:focus { transform: translateY(0); }