/* MarginDelta AI — executive B2B landing page */

:root {
  --navy: #0B1F33;
  --navy-2: #102A44;
  --slate: #64748B;
  --slate-light: #94A3B8;
  --line: #1B3149;
  --line-light: #E2E8F0;
  --white: #FFFFFF;
  --paper: #F6F8FA;
  --ink: #16283B;
  --muted: #55647A;
  --teal: #0F766E;
  --teal-bright: #5EEAD4;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.container {
  width: 100%;
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 24px;
}

h1, h2, h3 { line-height: 1.2; letter-spacing: -0.01em; font-weight: 650; }

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

/* Header */
.site-header {
  background: var(--white);
  border-bottom: 1px solid var(--line-light);
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.brand {
  display: flex;
  align-items: center;
}
.brand-logo {
  display: block;
  height: 40px;
  width: auto;
}
.brand-accent { color: var(--teal-bright); }
.nav-cta {
  color: var(--navy);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 8px 14px;
  border: 1px solid var(--line-light);
  border-radius: 6px;
  transition: border-color 0.15s ease, color 0.15s ease;
}
.nav-cta:hover { color: var(--teal); border-color: var(--teal); }

/* Hero */
.hero {
  background: var(--navy);
  color: var(--white);
  padding: 96px 0 104px;
  border-bottom: 1px solid var(--line);
}
.eyebrow {
  color: var(--teal-bright);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  font-weight: 600;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.15rem);
  max-width: 18ch;
  color: var(--white);
}
.hero .subhead {
  color: #b8c6d4;
  font-size: clamp(1.05rem, 2.2vw, 1.28rem);
  max-width: 60ch;
  margin-top: 22px;
}
.hero-actions { margin-top: 36px; }

/* Buttons */
.btn {
  display: inline-block;
  font-size: 1rem;
  font-weight: 600;
  padding: 15px 26px;
  border-radius: 7px;
  transition: background 0.15s ease, transform 0.05s ease;
}
.btn-primary {
  background: var(--teal);
  color: var(--white);
}
.btn-primary:hover { background: #0C5F58; }
.btn-primary:active { transform: translateY(1px); }

/* Sections */
.section { padding: 78px 0; }
.section-alt { background: var(--paper); }
.section h2 {
  font-size: clamp(1.6rem, 3.4vw, 2.15rem);
  color: var(--navy);
  max-width: 24ch;
}
.section-lead {
  color: var(--muted);
  font-size: 1.1rem;
  max-width: 62ch;
  margin-top: 16px;
}

/* Steps */
.steps {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 44px;
}
.step {
  background: var(--white);
  border: 1px solid var(--line-light);
  border-radius: 10px;
  padding: 30px 26px;
}
.step-num {
  display: block;
  color: var(--teal);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  margin-bottom: 14px;
}
.step h3 { font-size: 1.15rem; color: var(--navy); margin-bottom: 8px; }
.step p { color: var(--muted); font-size: 0.98rem; }

/* Pill grid (who it is for) */
.pill-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 36px;
}
.pill-grid li {
  background: var(--white);
  border: 1px solid var(--line-light);
  border-left: 3px solid var(--teal);
  border-radius: 8px;
  padding: 20px 22px;
  font-weight: 600;
  color: var(--navy);
  font-size: 1.05rem;
}

/* Check grid (what we look for) */
.check-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px 30px;
  margin-top: 36px;
}
.check-grid li {
  position: relative;
  padding-left: 30px;
  color: var(--ink);
  font-size: 1.05rem;
}
.check-grid li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 12px;
  height: 7px;
  border-left: 2px solid var(--teal);
  border-bottom: 2px solid var(--teal);
  transform: rotate(-45deg);
}

/* Deliverables */
.deliverables {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 40px;
}
.deliverables li {
  background: var(--white);
  border: 1px solid var(--line-light);
  border-radius: 10px;
  padding: 26px 22px;
  min-height: 108px;
  display: flex;
  align-items: center;
}
.deliverables h3 {
  font-size: 1.08rem;
  color: var(--navy);
  font-weight: 600;
}

/* Founder */
.founder p {
  color: var(--slate);
  font-size: 1.18rem;
  max-width: 66ch;
  margin-top: 18px;
  line-height: 1.7;
}
.founder strong { color: var(--navy); }

/* CTA band */
.cta-band {
  background: var(--navy-2);
  color: var(--white);
  padding: 72px 0;
  text-align: center;
}
.cta-band h2 { font-size: clamp(1.7rem, 3.4vw, 2.2rem); color: var(--white); margin: 0 auto; }
.cta-band p { color: #b8c6d4; font-size: 1.1rem; margin: 16px auto 30px; max-width: 52ch; }

/* Footer */
.site-footer {
  background: var(--navy);
  color: #9fb0c0;
  padding: 44px 0;
  border-top: 1px solid var(--line);
}
.footer-inner { display: flex; flex-direction: column; gap: 8px; }
.footer-brand { color: var(--white); font-weight: 700; font-size: 1.05rem; }
.footer-note { font-size: 0.95rem; }
.footer-contact { font-size: 0.95rem; }
.footer-contact a { color: var(--teal-bright); }
.footer-contact a:hover { text-decoration: underline; }

/* Responsive */
@media (max-width: 820px) {
  .steps { grid-template-columns: 1fr; }
  .deliverables { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .nav-cta { display: none; }
  .hero { padding: 68px 0 74px; }
  .section { padding: 56px 0; }
  .pill-grid,
  .check-grid,
  .deliverables { grid-template-columns: 1fr; }
  .btn { display: block; text-align: center; }
}