/* ==========================================================================
   DNAi Systems: shared design system (2026-09 overhaul)
   Single source of truth for tokens + site chrome + shared components.
   Pages may add page-specific styles, but chrome and tokens live here.
   Token prefix --dn- avoids collisions with legacy page-local variables.
   ========================================================================== */

/* ---------- Tokens ---------- */
:root {
  /* Warm clinical palette: keeps brand charcoal + logo teal, aligns with the
     2026-09 deck family (paper, ink, deep teal). */
  --dn-paper: #F7F5F1;        /* page background */
  --dn-paper-deep: #EFEAE1;   /* alternating band background */
  --dn-surface: #FFFFFF;      /* cards, panels */
  --dn-ink: #1C1C1C;          /* primary text */
  --dn-ink-soft: #4C4A44;     /* secondary text */
  --dn-ink-faint: #85816F;    /* muted text, meta */
  --dn-line: #E3DFD4;         /* hairlines, borders */
  --dn-line-strong: #CFC9B9;

  --dn-teal: #0A5C4F;         /* interactive: links, buttons, headline accents */
  --dn-teal-hover: #084A40;
  --dn-teal-bright: #39ADB4;  /* brand accent from the wordmark: graphics, small highlights */
  --dn-teal-wash: #E7F0ED;    /* tinted chips and backgrounds */

  --dn-gold: #B45309;         /* single gold accent (AA on paper/white) */
  --dn-gold-wash: #F6EDDC;

  --dn-pine: #1A2A27;         /* dark band background (deck dark panel) */
  --dn-pine-ink: #F2EFE9;     /* text on pine */
  --dn-pine-line: #33453F;

  --dn-serif: 'Newsreader', Georgia, 'Times New Roman', serif;
  --dn-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --dn-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  --dn-radius: 14px;
  --dn-radius-lg: 20px;
  --dn-shadow: 0 1px 2px rgba(28, 28, 28, .05), 0 6px 20px rgba(28, 28, 28, .06);
  --dn-shadow-lift: 0 2px 6px rgba(28, 28, 28, .07), 0 14px 34px rgba(10, 92, 79, .10);

  --dn-header-h: 68px;
  --dn-container: 1120px;
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body.dn-body {
  margin: 0;
  font-family: var(--dn-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--dn-ink);
  background: var(--dn-paper);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

body.dn-body main { flex: 1; }

.dn-container { width: 100%; max-width: var(--dn-container); margin: 0 auto; padding: 0 1.5rem; }

::selection { background: rgba(57, 173, 180, .28); }

/* ---------- Typography helpers ---------- */
.dn-display, .dn-h2, .dn-h3 {
  font-family: var(--dn-serif);
  font-weight: 600;
  color: var(--dn-ink);
  letter-spacing: -.01em;
  line-height: 1.12;
  margin: 0 0 1rem;
}
.dn-display { font-size: clamp(2.35rem, 5.2vw, 3.7rem); }
.dn-h2 { font-size: clamp(1.7rem, 3.2vw, 2.35rem); line-height: 1.18; }
.dn-h3 { font-size: 1.25rem; line-height: 1.3; }

.dn-kicker {
  font-family: var(--dn-sans);
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--dn-teal);
  margin: 0 0 .9rem;
}

.dn-lead { font-size: clamp(1.05rem, 1.6vw, 1.2rem); color: var(--dn-ink-soft); line-height: 1.7; }
.dn-muted { color: var(--dn-ink-faint); }

a.dn-link { color: var(--dn-teal); text-decoration: none; border-bottom: 1px solid rgba(10, 92, 79, .3); transition: border-color .15s, color .15s; }
a.dn-link:hover { color: var(--dn-teal-hover); border-bottom-color: var(--dn-teal-hover); }

/* ---------- Buttons ---------- */
.dn-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .45rem;
  padding: .72rem 1.45rem;
  border-radius: 999px;
  font-family: var(--dn-sans);
  font-size: .95rem;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background .15s, border-color .15s, color .15s, box-shadow .15s, transform .12s;
}
.dn-btn:active { transform: translateY(1px); }
.dn-btn-primary { background: var(--dn-teal); color: #fff; }
.dn-btn-primary:hover { background: var(--dn-teal-hover); box-shadow: var(--dn-shadow-lift); }
.dn-btn-secondary { background: transparent; color: var(--dn-teal); border-color: var(--dn-line-strong); }
.dn-btn-secondary:hover { border-color: var(--dn-teal); background: var(--dn-teal-wash); }
.dn-btn-ondark { background: var(--dn-teal-bright); color: var(--dn-pine); }
.dn-btn-ondark:hover { background: #4FBEC4; }
.dn-btn-sm { padding: .5rem 1.05rem; font-size: .85rem; }

/* ---------- Header ---------- */
.dn-header {
  position: sticky;
  top: 0;
  z-index: 220;
  background: rgba(247, 245, 241, .92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--dn-line);
  /* Insulate chrome from page-level body font/color overrides (plate, console). */
  font-family: var(--dn-sans);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--dn-ink);
}
.dn-header-inner {
  max-width: var(--dn-container);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: var(--dn-header-h);
  display: flex;
  align-items: center;
  gap: 1.4rem;
}
.dn-logo { display: inline-flex; align-items: center; flex-shrink: 0; }
.dn-logo img { height: 30px; width: auto; display: block; }

.dn-nav { display: flex; align-items: center; gap: .35rem; margin-left: .4rem; }

.dn-nav-group { position: relative; }
.dn-nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: .32rem;
  padding: .5rem .8rem;
  border: none;
  background: none;
  border-radius: 9px;
  font-family: var(--dn-sans);
  font-size: .92rem;
  font-weight: 500;
  color: var(--dn-ink-soft);
  cursor: pointer;
  transition: color .15s, background .15s;
}
.dn-nav-toggle::after {
  content: '';
  width: .42em; height: .42em;
  border-right: 1.6px solid currentColor;
  border-bottom: 1.6px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
  transition: transform .15s;
}
.dn-nav-group:hover .dn-nav-toggle,
.dn-nav-group.open .dn-nav-toggle,
.dn-nav-toggle:focus-visible { color: var(--dn-ink); background: var(--dn-teal-wash); }

.dn-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 268px;
  background: var(--dn-surface);
  border: 1px solid var(--dn-line);
  border-radius: var(--dn-radius);
  box-shadow: var(--dn-shadow-lift);
  padding: .5rem;
  display: none;
  flex-direction: column;
  gap: 2px;
}
/* Invisible bridge over the 8px gap between the button and the menu, so
   hover is continuous and the menu does not collapse mid-travel. */
.dn-menu::before {
  content: '';
  position: absolute;
  top: -10px;
  left: 0;
  right: 0;
  height: 10px;
}
.dn-nav-group:hover .dn-menu,
.dn-nav-group:focus-within .dn-menu,
.dn-nav-group.open .dn-menu { display: flex; }

.dn-menu a {
  display: block;
  padding: .55rem .75rem;
  border-radius: 9px;
  text-decoration: none;
  color: var(--dn-ink);
  font-size: .92rem;
  font-weight: 600;
  line-height: 1.3;
  transition: background .12s;
}
.dn-menu a span { display: block; font-weight: 400; font-size: .8rem; color: var(--dn-ink-faint); margin-top: 1px; }
.dn-menu a:hover { background: var(--dn-teal-wash); }
/* "You are here" marker: subtle left bar + teal text, no filled background,
   so the current page never reads as a stuck selection. */
.dn-menu a[aria-current="page"] { box-shadow: inset 2px 0 0 var(--dn-teal); color: var(--dn-teal); }

.dn-header-cta { margin-left: auto; display: flex; align-items: center; gap: .6rem; }

.dn-burger {
  display: none;
  margin-left: auto;
  width: 42px; height: 42px;
  border: 1px solid var(--dn-line);
  border-radius: 10px;
  background: var(--dn-surface);
  cursor: pointer;
  position: relative;
}
.dn-burger span, .dn-burger span::before, .dn-burger span::after {
  content: '';
  position: absolute;
  left: 50%;
  width: 18px; height: 2px;
  background: var(--dn-ink);
  transform: translateX(-50%);
  transition: transform .18s, opacity .18s;
}
.dn-burger span { top: 50%; margin-top: -1px; }
.dn-burger span::before { top: -6px; }
.dn-burger span::after { top: 6px; }
body.dn-nav-open .dn-burger span { background: transparent; }
body.dn-nav-open .dn-burger span::before { transform: translateX(-50%) translateY(6px) rotate(45deg); }
body.dn-nav-open .dn-burger span::after { transform: translateX(-50%) translateY(-6px) rotate(-45deg); }

/* Slim header variant (developer console) */
.dn-header-slim .dn-header-inner { height: 52px; }
.dn-header-slim .dn-logo img { height: 24px; }
.dn-header-slim .dn-slim-links { display: flex; align-items: center; gap: 1rem; margin-left: auto; }
.dn-header-slim .dn-slim-links a { font-size: .85rem; font-weight: 500; color: var(--dn-ink-soft); text-decoration: none; }
.dn-header-slim .dn-slim-links a:hover { color: var(--dn-teal); }

/* ---------- Mobile nav ---------- */
@media (max-width: 940px) {
  .dn-nav {
    position: fixed;
    inset: var(--dn-header-h) 0 auto 0;
    max-height: calc(100vh - var(--dn-header-h));
    overflow-y: auto;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin: 0;
    padding: .6rem 1rem 1.4rem;
    background: var(--dn-paper);
    border-bottom: 1px solid var(--dn-line);
    box-shadow: 0 24px 40px rgba(28, 28, 28, .12);
    display: none;
  }
  body.dn-nav-open .dn-nav { display: flex; }

  .dn-nav-group { border-bottom: 1px solid var(--dn-line); }
  .dn-nav-toggle { width: 100%; justify-content: space-between; padding: .95rem .25rem; font-size: 1rem; border-radius: 0; background: none; }
  .dn-nav-group:hover .dn-nav-toggle { background: none; }
  .dn-menu {
    position: static;
    display: none;
    border: none;
    box-shadow: none;
    background: transparent;
    padding: 0 0 .7rem;
    min-width: 0;
  }
  .dn-nav-group:hover .dn-menu, .dn-nav-group:focus-within .dn-menu { display: none; }
  .dn-nav-group.open .dn-menu { display: flex; }
  .dn-nav-group.open .dn-nav-toggle::after { transform: rotate(225deg) translateY(-2px); }

  .dn-header-cta .dn-btn { padding: .55rem 1.05rem; font-size: .88rem; }
  .dn-header-cta { margin-left: auto; margin-right: .75rem; }
  .dn-burger { display: block; margin-left: 0; }
}

/* ---------- Sections ---------- */
.dn-section { padding: clamp(3.2rem, 7vw, 5.5rem) 0; }
.dn-section-tight { padding: clamp(2.2rem, 5vw, 3.5rem) 0; }
.dn-band-deep { background: var(--dn-paper-deep); border-top: 1px solid var(--dn-line); border-bottom: 1px solid var(--dn-line); }
.dn-band-surface { background: var(--dn-surface); border-top: 1px solid var(--dn-line); border-bottom: 1px solid var(--dn-line); }
.dn-band-pine { background: var(--dn-pine); color: var(--dn-pine-ink); }
.dn-band-pine .dn-h2, .dn-band-pine .dn-h3, .dn-band-pine .dn-display { color: var(--dn-pine-ink); }
.dn-band-pine .dn-kicker { color: var(--dn-teal-bright); }
.dn-band-pine .dn-lead, .dn-band-pine p { color: rgba(242, 239, 233, .82); }

.dn-center { text-align: center; }
.dn-center .dn-lead { margin-left: auto; margin-right: auto; max-width: 46rem; }

/* ---------- Cards & grids ---------- */
.dn-grid { display: grid; gap: 1.15rem; }
.dn-grid-2 { grid-template-columns: repeat(2, 1fr); }
.dn-grid-3 { grid-template-columns: repeat(3, 1fr); }
.dn-grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 940px) { .dn-grid-3, .dn-grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .dn-grid-2, .dn-grid-3, .dn-grid-4 { grid-template-columns: 1fr; } }

.dn-card {
  background: var(--dn-surface);
  border: 1px solid var(--dn-line);
  border-radius: var(--dn-radius);
  padding: 1.6rem;
  box-shadow: var(--dn-shadow);
}
a.dn-card { display: block; text-decoration: none; color: inherit; transition: box-shadow .18s, transform .18s, border-color .18s; }
a.dn-card:hover { box-shadow: var(--dn-shadow-lift); transform: translateY(-2px); border-color: var(--dn-teal-bright); }

.dn-card .dn-h3 { margin-bottom: .45rem; }
.dn-card p { margin: 0; color: var(--dn-ink-soft); font-size: .95rem; }
.dn-card-cta { display: inline-block; margin-top: .9rem; color: var(--dn-teal); font-weight: 600; font-size: .9rem; }

/* ---------- Stat band ---------- */
.dn-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.1rem; }
@media (max-width: 940px) { .dn-stats { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .dn-stats { grid-template-columns: 1fr; } }
.dn-stat {
  background: var(--dn-surface);
  border: 1px solid var(--dn-line);
  border-radius: var(--dn-radius);
  padding: 1.35rem 1.2rem;
  text-align: center;
}
.dn-stat b {
  display: block;
  font-family: var(--dn-serif);
  font-size: 1.85rem;
  font-weight: 600;
  color: var(--dn-teal);
  line-height: 1.15;
  margin-bottom: .3rem;
}
.dn-stat span { font-size: .82rem; color: var(--dn-ink-faint); letter-spacing: .04em; text-transform: uppercase; font-weight: 500; }
.dn-stat small { display: block; margin-top: .35rem; font-size: .78rem; color: var(--dn-ink-faint); text-transform: none; letter-spacing: 0; }

/* ---------- Badges / chips ---------- */
.dn-chip {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .3rem .8rem;
  border-radius: 999px;
  background: var(--dn-teal-wash);
  color: var(--dn-teal);
  font-size: .76rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.dn-chip-gold { background: var(--dn-gold-wash); color: var(--dn-gold); }

/* ---------- Prose (articles, legal) ---------- */
.dn-prose { max-width: 46rem; margin: 0 auto; }
.dn-prose h1 { font-family: var(--dn-serif); font-weight: 600; font-size: clamp(2rem, 4vw, 2.8rem); line-height: 1.15; margin: 0 0 1rem; }
.dn-prose h2 { font-family: var(--dn-serif); font-weight: 600; font-size: 1.55rem; margin: 2.4rem 0 .8rem; }
.dn-prose h3 { font-size: 1.12rem; font-weight: 600; margin: 1.8rem 0 .6rem; }
.dn-prose p, .dn-prose li { color: var(--dn-ink-soft); }
.dn-prose a { color: var(--dn-teal); }
.dn-prose blockquote {
  margin: 1.6rem 0;
  padding: 1rem 1.4rem;
  border-left: 3px solid var(--dn-teal-bright);
  background: var(--dn-teal-wash);
  border-radius: 0 var(--dn-radius) var(--dn-radius) 0;
  font-style: italic;
}
.dn-prose code { font-family: var(--dn-mono); font-size: .85em; background: var(--dn-paper-deep); padding: .12rem .4rem; border-radius: 5px; }

/* ---------- Page hero ---------- */
.dn-page-hero { padding: clamp(3rem, 6vw, 4.6rem) 0 clamp(2rem, 4vw, 3rem); }
.dn-page-hero .dn-lead { max-width: 44rem; }

/* ---------- Screenshot frame ---------- */
.dn-shot {
  border: 1px solid var(--dn-line);
  border-radius: var(--dn-radius-lg);
  overflow: hidden;
  box-shadow: var(--dn-shadow-lift);
  background: var(--dn-surface);
}
.dn-shot img, .dn-shot video { display: block; width: 100%; height: auto; }

/* ---------- Footer ---------- */
.dn-footer {
  background: var(--dn-pine);
  color: var(--dn-pine-ink);
  margin-top: auto;
  /* Insulate chrome from page-level body font overrides. */
  font-family: var(--dn-sans);
  font-size: 1rem;
  line-height: 1.5;
  font-style: normal;
  letter-spacing: normal;
  text-align: left;
}
.dn-footer-inner {
  max-width: var(--dn-container);
  margin: 0 auto;
  padding: 3.2rem 1.5rem 2.2rem;
  display: grid;
  grid-template-columns: 1.5fr repeat(4, 1fr);
  gap: 2rem;
}
@media (max-width: 940px) { .dn-footer-inner { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .dn-footer-inner { grid-template-columns: 1fr; } }

.dn-footer-brand img { height: 26px; width: auto; filter: brightness(0) invert(1); opacity: .92; }
.dn-footer-brand p { font-size: .88rem; color: rgba(242, 239, 233, .72); line-height: 1.6; margin: .9rem 0; max-width: 17rem; }
.dn-footer-brand a { color: var(--dn-teal-bright); text-decoration: none; font-size: .88rem; }
.dn-footer-brand a:hover { text-decoration: underline; }

.dn-footer-col h4 {
  font-size: .74rem;
  font-weight: 600;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: rgba(242, 239, 233, .5);
  margin: 0 0 .8rem;
}
.dn-footer-col a {
  display: block;
  padding: .22rem 0;
  color: rgba(242, 239, 233, .85);
  font-size: .9rem;
  text-decoration: none;
}
.dn-footer-col a:hover { color: var(--dn-teal-bright); }

.dn-footer-legal {
  border-top: 1px solid var(--dn-pine-line);
  padding: 1.6rem 1.5rem 2.2rem;
  max-width: var(--dn-container);
  margin: 0 auto;
}
.dn-footer-legal p { font-size: .78rem; color: rgba(242, 239, 233, .55); margin: .3rem 0; line-height: 1.55; }
.dn-footer-legal a { color: rgba(242, 239, 233, .75); }
.dn-footer-legal a:hover { color: var(--dn-teal-bright); }

/* ---------- Motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}