/* ========================================================================
   Constantine Consulting — Alpine Editorial Design System
   Deep alpine palette · Geometric sans · Bold confident · Restrained
   ======================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  /* Palette — deep alpine */
  --ink:        #0B1320;   /* near-black, slate undertone */
  --slate-900:  #131C2E;
  --slate-800:  #1B2740;
  --slate-700:  #2A3A56;
  --slate-500:  #4A5A78;
  --slate-400:  #6E7E99;
  --slate-300:  #97A3B8;
  --slate-200:  #C4CCDB;
  --slate-100:  #E5E9F0;
  --snow:       #F5F6F8;
  --paper:      #FAFAF7;
  --cream:      #F2EEE5;

  /* Glacial accent */
  --glacial:    #6FA3B8;
  --glacial-dark: #3F7A91;

  /* Single warm accent */
  --copper:     #C8743A;
  --copper-dark:#A05828;
  --amber:      #E0A45A;

  /* Type */
  --font-sans: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  /* Spacing rhythm */
  --gutter: clamp(20px, 5vw, 64px);
  --section-y: clamp(80px, 12vw, 160px);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

body {
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--paper);
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* ---------- Typography ---------- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--copper);
}
.eyebrow.muted { color: var(--slate-500); }
.eyebrow.snow  { color: var(--slate-200); }

h1, h2, h3, h4 {
  font-family: var(--font-sans);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.05;
  color: var(--ink);
}
h1 { font-size: clamp(46px, 7.5vw, 108px); font-weight: 600; letter-spacing: -0.035em; line-height: 0.98; }
h2 { font-size: clamp(36px, 5vw, 64px); letter-spacing: -0.025em; line-height: 1.03; }
h3 { font-size: clamp(22px, 2.2vw, 30px); letter-spacing: -0.015em; line-height: 1.15; }
h4 { font-size: 18px; letter-spacing: 0; }

p.lede {
  font-size: clamp(19px, 1.6vw, 23px);
  line-height: 1.5;
  color: var(--slate-700);
  font-weight: 400;
  max-width: 62ch;
}

p { color: var(--slate-700); }

/* ---------- Layout ---------- */
.shell {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.shell-narrow { max-width: 1120px; margin: 0 auto; padding: 0 var(--gutter); }

section { padding: var(--section-y) 0; }

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 250, 247, 0.86);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid rgba(11, 19, 32, 0.06);
}
.nav-inner {
  max-width: 1440px;
  margin: 0 auto;
  padding: 18px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.nav-mark {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  letter-spacing: -0.01em;
  font-size: 16px;
}
.nav-mark .glyph {
  width: 22px; height: 22px;
}
.nav-links {
  display: flex;
  gap: 36px;
  align-items: center;
}
.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--slate-700);
  letter-spacing: 0;
  position: relative;
  transition: color 0.18s ease;
}
.nav-links a.active { color: var(--ink); }
.nav-links a:hover { color: var(--ink); }
.nav-links a.active::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -8px;
  height: 2px;
  background: var(--copper);
}
.nav-cta {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
  border: 1px solid var(--ink);
  padding: 9px 18px;
  border-radius: 999px;
  transition: background 0.18s ease, color 0.18s ease;
}
.nav-cta:hover { background: var(--ink); color: var(--paper); }

/* ---------- Nav dropdown (Free Tools) ---------- */
.nav-item { position: relative; display: inline-flex; align-items: center; }
.nav-item.has-dropdown > a { display: inline-flex; align-items: center; gap: 5px; }
.nav-item.has-dropdown > a .caret { font-size: 9px; color: var(--slate-400); transition: transform 0.18s ease; }
.nav-item.has-dropdown:hover > a .caret,
.nav-item.has-dropdown:focus-within > a .caret { transform: rotate(180deg); color: var(--copper); }
.nav-dropdown {
  position: absolute; top: 100%; left: 50%;
  transform: translateX(-50%) translateY(8px);
  margin-top: 14px;
  background: var(--paper);
  border: 1px solid rgba(11, 19, 32, 0.10);
  border-top: 2px solid var(--copper);
  box-shadow: 0 26px 54px -28px rgba(11, 19, 32, 0.55);
  min-width: 230px; padding: 8px;
  display: flex; flex-direction: column; gap: 2px;
  opacity: 0; visibility: hidden; pointer-events: none;
  transition: opacity 0.18s ease, transform 0.18s ease;
  z-index: 120;
}
/* invisible hover bridge so the cursor can cross the gap */
.nav-dropdown::before {
  content: ''; position: absolute; left: 0; right: 0; top: -16px; height: 16px;
}
.nav-item.has-dropdown:hover .nav-dropdown,
.nav-item.has-dropdown:focus-within .nav-dropdown {
  opacity: 1; visibility: visible; pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}
.nav-dropdown a {
  font-size: 14px; font-weight: 500; color: var(--slate-700);
  padding: 11px 13px; white-space: nowrap; letter-spacing: 0;
  transition: background 0.15s ease, color 0.15s ease;
}
.nav-dropdown a:hover { background: var(--snow); color: var(--ink); }
.nav-dropdown a.active::after { display: none; }

/* drawer sub-items */
.nav-drawer .nav-drawer-sub {
  padding-left: 18px; font-size: 15px; color: var(--slate-500);
  position: relative;
}
.nav-drawer .nav-drawer-sub::before {
  content: ''; position: absolute; left: 2px; top: 50%; width: 7px; height: 1px;
  background: var(--copper); transform: translateY(-50%);
}

/* ---------- Hamburger + mobile drawer ---------- */
.nav-burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  margin: -10px -8px -10px 0;
}
.nav-burger span {
  display: block;
  width: 24px;
  height: 2px;
  margin: 0 auto;
  background: var(--ink);
  transition: transform 0.25s ease, opacity 0.2s ease;
}
.nav.drawer-open .nav-burger span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav.drawer-open .nav-burger span:nth-child(2) { opacity: 0; }
.nav.drawer-open .nav-burger span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-drawer {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 8px var(--gutter) 28px;
  border-top: 1px solid rgba(11, 19, 32, 0.06);
}
.nav-drawer a {
  font-size: 17px;
  font-weight: 500;
  color: var(--slate-700);
  padding: 14px 0;
  border-bottom: 1px solid rgba(11, 19, 32, 0.06);
}
.nav-drawer a.active { color: var(--ink); }
.nav-drawer .nav-drawer-cta {
  margin-top: 18px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  text-align: center;
  padding: 14px 18px;
  color: var(--ink);
  font-size: 15px;
}
.nav-drawer .nav-drawer-cta:hover { background: var(--ink); color: var(--paper); }

@media (max-width: 1024px) {
  .nav-links { display: none; }
  .nav-cta { display: none; }
  .nav-burger { display: flex; }
  .nav.drawer-open .nav-drawer { display: flex; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 28px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.005em;
  border-radius: 4px;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.btn-primary {
  background: var(--ink);
  color: var(--paper);
}
.btn-primary:hover { background: var(--copper); }
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid rgba(11, 19, 32, 0.18);
}
.btn-ghost:hover { border-color: var(--ink); }
.btn-on-dark {
  background: var(--paper);
  color: var(--ink);
}
.btn-on-dark:hover { background: var(--copper); color: var(--paper); }
.btn-ghost-dark {
  background: transparent;
  color: var(--snow);
  border: 1px solid rgba(245, 246, 248, 0.25);
}
.btn-ghost-dark:hover { border-color: var(--snow); }
.btn .arrow { display: inline-block; transition: transform 0.2s ease; }
.btn:hover .arrow { transform: translateX(4px); }

/* ---------- Hero shared ---------- */
.hero {
  position: relative;
  padding: clamp(60px, 9vw, 120px) 0 clamp(60px, 9vw, 100px);
}

/* ---------- Stat slabs ---------- */
.stat-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid rgba(11, 19, 32, 0.12);
  border-bottom: 1px solid rgba(11, 19, 32, 0.12);
}
.stat-row .stat {
  padding: 32px 28px;
  border-right: 1px solid rgba(11, 19, 32, 0.08);
}
.stat-row .stat:last-child { border-right: none; }
.stat .num {
  font-size: clamp(36px, 4vw, 52px);
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--ink);
  line-height: 1;
  display: block;
}
.stat .label {
  margin-top: 10px;
  font-size: 13px;
  color: var(--slate-500);
  letter-spacing: 0;
  line-height: 1.4;
}
@media (max-width: 880px) {
  .stat-row { grid-template-columns: 1fr 1fr; }
  .stat-row .stat:nth-child(2) { border-right: none; }
  .stat-row .stat:nth-child(1), .stat-row .stat:nth-child(2) {
    border-bottom: 1px solid rgba(11, 19, 32, 0.08);
  }
}

/* ---------- Section heading block ---------- */
.section-head {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 60px;
  align-items: end;
  margin-bottom: 64px;
}
.section-head .right p { max-width: 56ch; font-size: 18px; line-height: 1.55; }
@media (max-width: 880px) {
  .section-head { grid-template-columns: 1fr; gap: 24px; align-items: start; }
}

/* ---------- Cards (services / engagements / products) ---------- */
.card {
  background: var(--paper);
  border: 1px solid rgba(11, 19, 32, 0.10);
  padding: 36px 32px 32px;
  position: relative;
  display: flex;
  flex-direction: column;
  transition: border-color 0.2s ease, transform 0.25s ease;
}
.card:hover { border-color: var(--ink); }
.card .tick {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--copper);
  font-weight: 500;
  margin-bottom: 24px;
}
.card h3 { margin-bottom: 6px; }
.card .sub {
  font-size: 14px;
  color: var(--slate-500);
  margin-bottom: 18px;
  font-style: italic;
}
.card .body {
  color: var(--slate-700);
  font-size: 15px;
  line-height: 1.55;
  margin-bottom: 22px;
}
.card ul {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 18px;
  margin-top: auto;
}
.card ul li {
  font-size: 13.5px;
  color: var(--slate-700);
  line-height: 1.5;
  padding-left: 14px;
  position: relative;
}
.card ul li::before {
  content: '';
  position: absolute;
  left: 0; top: 9px;
  width: 6px; height: 1px;
  background: var(--copper);
}
@media (max-width: 640px) {
  .card ul { grid-template-columns: 1fr; }
}

/* ---------- Footer ---------- */
.footer {
  background: var(--ink);
  color: var(--slate-200);
  padding: 80px 0 36px;
}
.footer .footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 60px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.footer h5 {
  font-size: 12px;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--slate-400);
  font-weight: 500;
  margin-bottom: 18px;
}
.footer ul { list-style: none; }
.footer ul li { margin-bottom: 10px; }
.footer ul li a { color: var(--slate-200); font-size: 14px; transition: color 0.18s ease; }
.footer ul li a:hover { color: var(--copper); }
.footer .brand-block .mark {
  font-size: 22px; font-weight: 600; letter-spacing: -0.01em; color: var(--snow);
  margin-bottom: 16px; display: flex; align-items: center; gap: 10px;
}
.footer .brand-block p { color: var(--slate-300); font-size: 14px; max-width: 38ch; }
.footer .meta {
  margin-top: 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--slate-400);
  font-family: var(--font-mono);
}
@media (max-width: 880px) {
  .footer .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px 24px; }
  .footer .meta { flex-direction: column; gap: 12px; align-items: flex-start; }
}

/* ---------- Mountain glyph utility ---------- */
.ridge-rule {
  width: 100%;
  height: 18px;
  display: block;
  color: var(--slate-300);
}

/* ---------- Reveal on scroll ---------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.in {
  opacity: 1;
  transform: none;
}

/* ---------- Page chrome utilities ---------- */
.dark-block {
  background: var(--ink);
  color: var(--snow);
}
.dark-block h1, .dark-block h2, .dark-block h3 { color: var(--snow); }
.dark-block p { color: var(--slate-200); }
.dark-block .eyebrow { color: var(--amber); }
.dark-block .stat-row { border-color: rgba(255,255,255,0.12); }
.dark-block .stat-row .stat { border-right-color: rgba(255,255,255,0.08); }
.dark-block .stat .num { color: var(--snow); }
.dark-block .stat .label { color: var(--slate-300); }

.cream-block { background: var(--cream); }

/* ---------- Topographic background svg utility ---------- */
.topo-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.32;
  z-index: 0;
}