/* ---------- Base ---------- */
:root {
  --bg: #ffffff;
  --bg-alt: #f5f5f7;
  --text: #1d1d1f;
  --text-muted: #6e6e73;
  --accent-a: #0071e3;
  --accent-b: #ff5c72;
  --border: #e4e4e6;
  --radius: 16px;
  --max-width: 1080px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { font-weight: 700; letter-spacing: -0.01em; margin: 0; }
p { margin: 0 0 12px; color: var(--text-muted); }
a { color: var(--accent-a); text-decoration: none; }

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}
.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-name { font-weight: 700; font-size: 15px; color: var(--text); }
.nav nav { display: flex; gap: 24px; }
.nav nav a { color: var(--text-muted); font-size: 14px; font-weight: 500; }
.nav nav a:hover { color: var(--text); }

/* ---------- Hero ---------- */
.hero { padding: 72px 24px 0; }
.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
}
.eyebrow {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent-a);
  margin-bottom: 12px;
}
.hero h1 {
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.15;
  margin-bottom: 20px;
}
.hero-sub {
  max-width: 640px;
  margin: 0 auto 32px;
  font-size: 17px;
  color: var(--text-muted);
}

.cta-row { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.cta-row.center { justify-content: center; }

.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 980px;
  font-size: 15px;
  font-weight: 600;
  transition: transform 0.15s ease, opacity 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--accent-a); color: #fff; }
.btn-primary:hover { opacity: 0.9; }
.btn-secondary { background: var(--bg-alt); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background: #ebebed; }

.stat-row {
  max-width: var(--max-width);
  margin: 56px auto 0;
  padding: 32px 24px;
  border-top: 1px solid var(--border);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  text-align: center;
}
.stat { display: flex; flex-direction: column; gap: 6px; }
.stat-num { font-size: 20px; font-weight: 700; color: var(--text); }
.stat-label { font-size: 11px; font-weight: 600; letter-spacing: 0.06em; color: var(--text-muted); }

/* ---------- Sections ---------- */
.section { padding: 72px 24px; }
.section.alt { background: var(--bg-alt); }
.section-inner { max-width: var(--max-width); margin: 0 auto; }
.section-inner.narrow { max-width: 720px; }
.section-inner.center { text-align: center; }
.section h2 { font-size: 30px; margin-bottom: 12px; }
.section-sub { max-width: 640px; font-size: 16px; margin-bottom: 40px; }

/* ---------- Cards ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  border-top: 3px solid var(--accent-a);
}
.card.accent-b { border-top-color: var(--accent-b); }
.card h3 { font-size: 17px; margin-bottom: 10px; }
.card p { font-size: 14.5px; margin-bottom: 0; }

/* ---------- Case studies ---------- */
.case-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.case-card {
  background: var(--bg-alt);
  border-radius: var(--radius);
  padding: 28px;
}
.case-tag {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--accent-a);
  text-transform: uppercase;
  margin-bottom: 8px;
}
.case-card h3 { font-size: 18px; margin-bottom: 10px; }
.case-card p { font-size: 14.5px; }
.case-note {
  font-size: 13px;
  font-style: italic;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  padding-top: 12px;
  margin-top: 12px;
  margin-bottom: 0;
}

/* ---------- Credentials ---------- */
.credential-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.credential-list li {
  padding: 14px 18px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  font-size: 15px;
  color: var(--text);
}

/* ---------- Footer ---------- */
.footer {
  padding: 32px 24px;
  text-align: center;
  border-top: 1px solid var(--border);
}
.footer p { font-size: 13px; margin: 0; }

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  .stat-row { grid-template-columns: repeat(2, 1fr); }
  .card-grid, .case-grid { grid-template-columns: 1fr; }
}