/* Mainframe Research — shared stylesheet */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --black:   #000000;
  --white:   #FFFFFF;
  --blue:    #007BFF;
  --blue-dk: #0062CC;
  --gray-1:  #F5F5F5;
  --gray-2:  #E8E8E8;
  --gray-3:  #999999;
  --gray-4:  #444444;
  --font:    'Inter', system-ui, sans-serif;
  --nav-h:   60px;
  --pad:     20px;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--white);
  color: var(--black);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

.wrap { max-width: 1100px; margin: 0 auto; padding: 0 var(--pad); }

/* ---------- Nav ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-h);
  background: var(--white);
  border-bottom: 1px solid var(--gray-2);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 32px;
}
.nav-logo {
  font-weight: 800; font-size: 13px;
  letter-spacing: 0.14em; text-transform: uppercase;
}
.nav-links { display: flex; gap: 36px; }
.nav-links a {
  font-size: 11px; font-weight: 600;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--gray-3);
}
.nav-links a.active, .nav-links a:hover { color: var(--black); }
.nav-ext { font-size: 12px; font-weight: 600; color: var(--blue); }
.nav-ext:hover { color: var(--blue-dk); }

/* ---------- Type helpers ---------- */
.kicker {
  font-size: 11px; font-weight: 700;
  letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--gray-3);
}
.kicker--blue { color: var(--blue); }
.accent-bar { width: 26px; height: 3px; background: var(--blue); margin: 28px 0; }

h1 {
  font-size: clamp(42px, 6.5vw, 72px);
  font-weight: 800; line-height: 1.05;
  letter-spacing: -0.02em; margin: 14px 0 18px;
}
h2 {
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 800; line-height: 1.15;
  letter-spacing: -0.015em; margin: 12px 0 16px;
}
.lede, .body-copy p { font-size: 16px; color: var(--gray-4); max-width: 620px; }
.body-copy p + p { margin-top: 18px; }
.body-copy strong { color: var(--black); }

.meta {
  font-size: 11px; font-weight: 600;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--gray-3);
}
.meta .sep { color: var(--gray-2); margin: 0 8px; }

/* ---------- Buttons ---------- */
.btn-row { display: flex; gap: 14px; margin-top: 40px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 15px 26px;
  font-size: 11px; font-weight: 700;
  letter-spacing: 0.12em; text-transform: uppercase;
  border: 1px solid var(--black);
}
.btn--solid { background: var(--black); color: var(--white); }
.btn--solid:hover { background: var(--blue-dk); border-color: var(--blue-dk); }
.btn--ghost { background: var(--white); color: var(--black); }
.btn--ghost:hover { border-color: var(--blue); color: var(--blue); }

/* ---------- Sections ---------- */
.section { padding: 110px 0; }
.section--dark { background: var(--black); color: var(--white); }
.section--dark .body-copy p { color: var(--gray-2); }
.section--dark .body-copy strong { color: var(--white); }
.section--gray { background: var(--gray-1); }

.hero { padding: calc(var(--nav-h) + 90px) 0 100px; }
.hero .inner { max-width: 720px; margin: 0 auto; padding: 0 var(--pad); }

/* ---------- Two-column split ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 70px; align-items: start; }
@media (max-width: 800px) { .split { grid-template-columns: 1fr; gap: 40px; } }

/* ---------- Stats ---------- */
.stat { border-left: 3px solid var(--blue); padding-left: 22px; }
.stat + .stat { margin-top: 42px; }
.stat .num { font-size: 44px; font-weight: 800; line-height: 1.1; letter-spacing: -0.02em; }
.stat p { font-size: 13px; color: var(--gray-3); margin-top: 8px; max-width: 420px; }

/* ---------- Layer cards ---------- */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 56px; border: 1px solid var(--gray-2); }
@media (max-width: 800px) { .cards { grid-template-columns: 1fr; } }
.card { padding: 36px 28px 48px; border-right: 1px solid var(--gray-2); }
.card:last-child { border-right: 0; }
.card .kicker { margin-bottom: 16px; display: block; }
.card h3 { font-size: 19px; font-weight: 700; line-height: 1.35; margin-bottom: 14px; }
.card p { font-size: 13.5px; color: var(--gray-4); }
.card--dark { background: var(--black); color: var(--white); }
.card--dark p { color: var(--gray-2); }
.card--dark strong { color: var(--white); }

/* ---------- Domains ---------- */
.domain { border-top: 1px solid var(--gray-2); padding: 70px 0; }
.domain-grid { display: grid; grid-template-columns: 160px 1fr; gap: 50px; }
@media (max-width: 800px) { .domain-grid { grid-template-columns: 1fr; gap: 20px; } }
.domain-num .kicker { display: block; }
.domain-num .n { font-size: 56px; font-weight: 800; line-height: 1; margin-top: 6px; }
.domain h3 {
  font-size: 12px; font-weight: 700;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--blue); margin-bottom: 12px;
}
.domain .q { font-size: 22px; font-weight: 700; line-height: 1.35; margin-bottom: 20px; max-width: 640px; }
.chips { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.chip {
  font-size: 10px; font-weight: 700;
  letter-spacing: 0.12em; text-transform: uppercase;
  border: 1px solid var(--gray-2); color: var(--gray-4);
  padding: 7px 12px;
}

/* ---------- Design panels ---------- */
.panels { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--gray-2); border: 1px solid var(--gray-2); margin-top: 50px; }
@media (max-width: 800px) { .panels { grid-template-columns: 1fr; } }
.panel { background: var(--white); padding: 34px 28px; }
.panel h4 {
  font-size: 11px; font-weight: 700;
  letter-spacing: 0.14em; text-transform: uppercase;
  margin-bottom: 14px;
}
.panel p { font-size: 13.5px; color: var(--gray-4); }

/* ---------- Note / commitment ---------- */
.note { border: 1px solid var(--gray-2); border-left: 3px solid var(--blue); padding: 26px 30px; margin-top: 60px; }
.note p { font-size: 13.5px; color: var(--gray-4); max-width: none; }
.note strong { color: var(--black); }

/* ---------- Footer ---------- */
footer { border-top: 1px solid var(--gray-2); padding: 54px 0 70px; }
.foot { display: flex; justify-content: space-between; gap: 30px; flex-wrap: wrap; }
.foot .fl { font-weight: 800; font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase; }
.foot p { font-size: 12.5px; color: var(--gray-3); margin-top: 8px; }
.foot a { color: var(--blue); }
.foot a:hover { color: var(--blue-dk); }

/* ---------- Utility ---------- */
.mt-60 { margin-top: 60px; }
.max-640 { max-width: 640px; }