/* =============================================================
   CryoKnife — high-fidelity website
   Type: Newsreader (display) + DM Sans (body) + IBM Plex Mono (data)
   Palette: dopely blues — navy ink, mid-blue accent
   ============================================================= */

:root {
  /* palette */
  --ink:        #072D44;
  --ink-2:      #064469;
  --accent:     #5790AB;
  --accent-2:   #9CCDDB;
  --rule:       #D0D7E1;
  --rule-2:     #E5EAF0;
  --paper:      #FAFAF7;
  --paper-2:    #F4F2EC;
  --white:      #FFFFFF;
  --muted:      #5A6B7A;

  /* type */
  --serif: "Newsreader", "Source Serif 4", Georgia, serif;
  --sans:  "DM Sans", "Helvetica Neue", Arial, sans-serif;
  --mono:  "IBM Plex Mono", ui-monospace, monospace;

  /* spacing */
  --container: 1200px;
  --container-narrow: 880px;
  --gutter: 32px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  font-size: 17px;
  line-height: 1.55;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

::selection { background: var(--accent-2); color: var(--ink); }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.container.narrow { max-width: var(--container-narrow); }

/* =================== TYPE =================== */
.serif { font-family: var(--serif); font-weight: 500; }
.mono  { font-family: var(--mono); }

.eyebrow {
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--accent);
}

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.01em;
  margin: 0;
}

.display {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(44px, 6vw, 76px);
  line-height: 1.02;
  letter-spacing: -0.022em;
  color: var(--ink);
}
.display em {
  font-style: italic;
  color: var(--accent);
  font-weight: 400;
}

.h2 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(32px, 3.6vw, 46px);
  line-height: 1.08;
  letter-spacing: -0.018em;
}
.h3 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(22px, 2vw, 26px);
  line-height: 1.2;
  letter-spacing: -0.012em;
}

.lede {
  font-family: var(--sans);
  font-size: clamp(17px, 1.4vw, 20px);
  line-height: 1.55;
  color: var(--ink-2);
  font-weight: 400;
  max-width: 60ch;
}

.body { font-size: 16px; line-height: 1.6; color: var(--ink-2); }
.body.lg { font-size: 17px; }
.body strong { color: var(--ink); font-weight: 600; }

.kicker {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--muted);
}

/* =================== BUTTONS =================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 500;
  padding: 14px 24px;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.18s ease;
  text-decoration: none;
  line-height: 1;
}
.btn-primary {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
.btn-primary:hover {
  background: var(--ink-2);
  border-color: var(--ink-2);
  transform: translateY(-1px);
}
.btn-secondary {
  background: transparent;
  color: var(--ink);
  border-color: var(--ink);
}
.btn-secondary:hover {
  background: var(--ink);
  color: var(--paper);
}
.btn-ghost {
  background: transparent;
  color: var(--ink);
  padding: 14px 4px;
  border-radius: 0;
}
.btn-ghost:hover { color: var(--accent); }
.btn-ghost .arrow { transition: transform 0.18s ease; }
.btn-ghost:hover .arrow { transform: translateX(4px); }

.btn-light {
  background: var(--white);
  color: var(--ink);
  border-color: var(--rule);
}
.btn-light:hover { border-color: var(--ink); }

/* =================== NAV =================== */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 250, 247, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--rule-2);
}
.nav-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 18px 0;
  gap: 24px;
}
.nav-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.nav-logo img { height: 32px; width: auto; }
.nav-logo .wordmark { font-size: 22px; }
.nav-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 36px;
  justify-content: center;
}
.nav-links a {
  font-size: 15px;
  font-weight: 500;
  color: var(--ink-2);
  transition: color 0.15s ease;
  position: relative;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a.is-active { color: var(--ink); }
.nav-links a.is-active::after {
  content: "";
  position: absolute;
  bottom: -8px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}
.nav-cta {
  display: flex;
  justify-content: flex-end;
}
.nav-cta .btn {
  padding: 10px 20px;
  font-size: 14px;
}

/* =================== SECTIONS =================== */
section { padding: 96px 0; }
.section-tight { padding: 64px 0; }
.section-lg    { padding: 120px 0; }
.section-divider { border-top: 1px solid var(--rule-2); }

/* =================== IMAGE PLACEHOLDER =================== */
.photo {
  position: relative;
  background: var(--paper-2);
  border-radius: 4px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-2);
  border: 1px solid var(--rule);
}
.photo::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, transparent 49.5%, var(--rule) 49.5%, var(--rule) 50.5%, transparent 50.5%);
  opacity: 0.55;
}
.photo .label {
  position: relative;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  background: var(--paper);
  border: 1px solid var(--rule);
  padding: 6px 12px;
  border-radius: 2px;
  color: var(--ink-2);
  z-index: 1;
}
.photo.tinted {
  background: linear-gradient(135deg, var(--accent-2), var(--rule));
}
.photo.tinted::before { opacity: 0.3; }
.photo.dark {
  background: linear-gradient(135deg, var(--ink) 0%, var(--ink-2) 100%);
  color: var(--paper);
  border-color: var(--ink);
}
.photo.dark::before { opacity: 0.15; }
.photo.dark .label { background: var(--ink-2); color: var(--paper); border-color: var(--ink-2); }

/* =================== STAT =================== */
.stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.stat {
  padding: 40px 32px;
  border-right: 1px solid var(--rule);
}
.stat:last-child { border-right: none; }
.stat .num {
  font-family: var(--serif);
  font-size: clamp(40px, 4.4vw, 56px);
  font-weight: 400;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 0 0 12px;
}
.stat .num em { font-style: italic; color: var(--accent); font-weight: 400; }
.stat .lbl {
  font-size: 14px;
  color: var(--ink-2);
  line-height: 1.45;
  max-width: 28ch;
}

/* =================== UTIL =================== */
.divider { height: 1px; background: var(--rule); border: 0; margin: 0; }
.cta-row { display: flex; gap: 14px; flex-wrap: wrap; }
.tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-2);
  background: var(--white);
  border: 1px solid var(--rule);
  padding: 6px 12px;
  border-radius: 999px;
}

/* =================== RESPONSIVE =================== */
@media (max-width: 860px) {
  .nav-inner { grid-template-columns: auto 1fr; }
  .nav-links { display: none; }
  .nav-cta { justify-content: flex-end; }
  section { padding: 64px 0; }
  .section-lg { padding: 80px 0; }
  .stat-row { grid-template-columns: 1fr; }
  .stat { border-right: none; border-bottom: 1px solid var(--rule); }
  .stat:last-child { border-bottom: none; }
}