:root {
  --bg: #FAFAF7;
  --bg-alt: #F2F1EC;
  --ink: #14161A;
  --ink-soft: #4A4F58;
  --ink-faint: #7A8089;
  --line: #E3E1DA;
  --accent: #1D4ED8;
  --accent-dark: #16389B;
  --serif: 'Instrument Serif', Georgia, serif;
  --sans: 'Inter', -apple-system, 'Segoe UI', sans-serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
::selection { background: #DCE4FB; }

/* ---------- Navigation ---------- */
header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(250,250,247,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px;
}
.logo {
  font-family: var(--serif);
  font-size: 1.45rem;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-decoration: none;
}
.logo span { color: var(--accent); }
.nav-links { display: flex; gap: 36px; align-items: center; }
.nav-links a {
  color: var(--ink-soft); text-decoration: none;
  font-size: 0.9rem; font-weight: 500;
  transition: color .15s;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a.btn, .nav-links a.btn:hover { color: #fff; }
.btn {
  display: inline-block;
  background: var(--ink);
  color: #fff;
  padding: 12px 26px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.01em;
  transition: background .15s, transform .15s;
}
.btn:hover { background: var(--accent-dark); }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: var(--accent-dark); }
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--ink);
}
.btn-ghost:hover { background: var(--ink); color: #fff; }

/* ---------- Hero ---------- */
.hero { padding: 110px 0 90px; text-align: center; }
.kicker {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 28px;
}
h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(2.6rem, 5.6vw, 4.4rem);
  line-height: 1.08;
  letter-spacing: -0.015em;
  max-width: 880px;
  margin: 0 auto 28px;
}
h1 em { font-style: italic; color: var(--accent); }
.hero p.lede {
  font-size: 1.15rem;
  color: var(--ink-soft);
  max-width: 620px;
  margin: 0 auto 40px;
}
.hero-ctas { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.hero-note { margin-top: 22px; font-size: 0.85rem; color: var(--ink-faint); }

/* ---------- Page hero (inner pages) ---------- */
.page-hero { padding: 90px 0 70px; border-bottom: 1px solid var(--line); }
.page-hero h1 { margin: 0 0 24px; max-width: 780px; }
.page-hero p.lede {
  font-size: 1.12rem; color: var(--ink-soft);
  max-width: 640px; margin-bottom: 36px;
}
.crumb {
  font-size: 0.82rem; color: var(--ink-faint); margin-bottom: 26px;
}
.crumb a { color: var(--ink-faint); text-decoration: none; }
.crumb a:hover { color: var(--ink); }

/* ---------- Stats ---------- */
.stats { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--bg-alt); }
.stats-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  padding: 48px 0;
}
.stat { text-align: center; padding: 0 16px; }
.stat + .stat { border-left: 1px solid var(--line); }
.stat .num {
  font-family: var(--serif);
  font-size: 2.4rem;
  line-height: 1.1;
  color: var(--ink);
}
.stat .label {
  font-size: 0.82rem; color: var(--ink-faint);
  margin-top: 6px; letter-spacing: 0.02em;
}

/* ---------- Section scaffolding ---------- */
section { padding: 100px 0; }
.section-head { max-width: 720px; margin-bottom: 64px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(2rem, 3.6vw, 2.9rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin-bottom: 18px;
}
h2 em { font-style: italic; color: var(--accent); }
.section-head p { color: var(--ink-soft); font-size: 1.05rem; }

/* ---------- Philosophy ---------- */
.philosophy { background: var(--ink); color: #F5F4F0; text-align: center; }
.philosophy .quote {
  font-family: var(--serif);
  font-size: clamp(1.7rem, 3.2vw, 2.5rem);
  line-height: 1.3;
  max-width: 820px;
  margin: 0 auto 24px;
}
.philosophy .quote em { font-style: italic; color: #93B2F5; }
.philosophy .attribution { color: #9BA1AB; font-size: 0.95rem; max-width: 560px; margin: 0 auto; }

/* ---------- Services ---------- */
.services-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px;
}
.service {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 40px 36px;
  transition: border-color .2s, box-shadow .2s;
  display: flex; flex-direction: column;
}
.service:hover { border-color: #C9CDD6; box-shadow: 0 8px 30px rgba(20,22,26,0.06); }
.service .index {
  font-size: 0.78rem; font-weight: 600; letter-spacing: 0.12em;
  color: var(--accent); margin-bottom: 18px; display: block;
}
.service h3 {
  font-family: var(--serif); font-weight: 400;
  font-size: 1.55rem; margin-bottom: 12px; letter-spacing: -0.01em;
}
.service p { color: var(--ink-soft); font-size: 0.95rem; margin-bottom: 20px; }
.service ul { list-style: none; flex: 1; }
.service li {
  font-size: 0.9rem; color: var(--ink-soft);
  padding: 8px 0 8px 22px;
  border-top: 1px solid var(--line);
  position: relative;
}
.service li::before {
  content: "";
  position: absolute; left: 2px; top: 15px;
  width: 7px; height: 7px;
  background: var(--accent);
  border-radius: 1px;
}
.service .service-link {
  margin-top: 24px;
  font-size: 0.9rem; font-weight: 600;
  color: var(--accent); text-decoration: none;
}
.service .service-link:hover { color: var(--accent-dark); text-decoration: underline; }

/* ---------- Detail lists (inner pages) ---------- */
.detail-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.detail-card {
  background: #fff; border: 1px solid var(--line); border-radius: 10px;
  padding: 34px 30px;
}
.detail-card h3 { font-size: 1.02rem; font-weight: 600; margin-bottom: 10px; }
.detail-card p { font-size: 0.93rem; color: var(--ink-soft); }

.plain-list { list-style: none; max-width: 760px; }
.plain-list li {
  padding: 16px 0 16px 26px;
  border-top: 1px solid var(--line);
  position: relative;
  color: var(--ink-soft); font-size: 0.98rem;
}
.plain-list li:last-child { border-bottom: 1px solid var(--line); }
.plain-list li::before {
  content: "";
  position: absolute; left: 2px; top: 26px;
  width: 7px; height: 7px;
  background: var(--accent);
  border-radius: 1px;
}
.plain-list li strong { color: var(--ink); }

/* ---------- Process ---------- */
.process { background: var(--bg-alt); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.steps.four { grid-template-columns: repeat(4, 1fr); }
.step { padding: 36px 32px; background: #fff; border: 1px solid var(--line); border-radius: 10px; }
.step .n {
  font-family: var(--serif); font-size: 2.6rem; color: var(--accent);
  line-height: 1; margin-bottom: 20px;
}
.step h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 10px; }
.step p { font-size: 0.92rem; color: var(--ink-soft); }

/* ---------- Tech stack grid ---------- */
.stack-section {
  background: var(--bg-alt);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.stack-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.stack-grid .cell {
  aspect-ratio: 1;
  background: var(--bg-alt);
  transition: background .25s ease, color .25s ease;
}
.stack-grid .cell.empty:hover { background: #E4E2D9; }
.stack-grid .cell.tool {
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 8px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ink-faint);
  cursor: default;
}
.stack-grid .cell.tool:hover {
  background: var(--brand, var(--accent));
  color: #fff;
}

/* ---------- Why ---------- */
.why-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 72px; align-items: start; }
.why-list { display: flex; flex-direction: column; }
.why-item { padding: 28px 0; border-top: 1px solid var(--line); }
.why-item:last-child { border-bottom: 1px solid var(--line); }
.why-item h3 { font-size: 1.02rem; font-weight: 600; margin-bottom: 8px; }
.why-item p { font-size: 0.93rem; color: var(--ink-soft); }
.why-copy .sticky { position: sticky; top: 110px; }
.why-copy p { color: var(--ink-soft); margin-top: 18px; font-size: 1rem; }

/* ---------- Testimonials ---------- */
.testimonials-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.testimonial {
  background: #fff; border: 1px solid var(--line); border-radius: 10px;
  padding: 36px 32px; display: flex; flex-direction: column; gap: 22px;
}
.testimonial blockquote {
  font-family: var(--serif); font-size: 1.18rem; line-height: 1.45;
  color: var(--ink); flex: 1;
}
.testimonial .who { border-top: 1px solid var(--line); padding-top: 18px; }
.testimonial .who strong { display: block; font-size: 0.92rem; font-weight: 600; }
.testimonial .who span { font-size: 0.83rem; color: var(--ink-faint); }

/* ---------- FAQ ---------- */
.faq-list { max-width: 760px; margin: 0 auto; }
details { border-top: 1px solid var(--line); }
details:last-child { border-bottom: 1px solid var(--line); }
summary {
  cursor: pointer; list-style: none;
  padding: 24px 40px 24px 0;
  font-weight: 600; font-size: 1rem;
  position: relative;
}
summary::-webkit-details-marker { display: none; }
summary::after {
  content: "+"; position: absolute; right: 4px; top: 50%;
  transform: translateY(-50%);
  font-family: var(--serif); font-size: 1.5rem; color: var(--accent);
  transition: transform .2s;
}
details[open] summary::after { content: "\00d7"; font-size: 1.2rem; }
details p { padding: 0 40px 26px 0; color: var(--ink-soft); font-size: 0.95rem; }

/* ---------- CTA ---------- */
.cta { background: var(--ink); color: #F5F4F0; text-align: center; }
.cta h2 { color: #F5F4F0; }
.cta h2 em { color: #93B2F5; }
.cta p { color: #9BA1AB; max-width: 560px; margin: 0 auto 40px; font-size: 1.05rem; }
.cta .btn { background: #fff; color: var(--ink); }
.cta .btn:hover { background: #DCE4FB; }
.cta .kicker { color: #93B2F5; }

/* ---------- Contact page ---------- */
.contact-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 72px; align-items: start; }
.contact-form { background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 40px 36px; }
.contact-form label {
  display: block; font-size: 0.85rem; font-weight: 600;
  margin: 22px 0 8px;
}
.contact-form label:first-of-type { margin-top: 0; }
.contact-form input, .contact-form select, .contact-form textarea {
  width: 100%; padding: 12px 14px;
  border: 1px solid var(--line); border-radius: 6px;
  font-family: var(--sans); font-size: 0.95rem;
  background: var(--bg); color: var(--ink);
}
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus {
  outline: 2px solid var(--accent); outline-offset: 0; border-color: transparent;
}
.contact-form button {
  margin-top: 28px; width: 100%; cursor: pointer; border: none;
  font-family: var(--sans);
}
.contact-aside h3 { font-size: 1.02rem; font-weight: 600; margin: 32px 0 8px; }
.contact-aside h3:first-child { margin-top: 0; }
.contact-aside p { color: var(--ink-soft); font-size: 0.95rem; }
.contact-aside a { color: var(--accent); text-decoration: none; }
.contact-aside a:hover { text-decoration: underline; }

/* ---------- Legal pages ---------- */
.legal { max-width: 760px; margin: 0 auto; padding: 80px 24px 100px; }
.legal h1 { margin: 0 0 12px; font-size: clamp(2.2rem, 4vw, 3rem); }
.legal .updated { color: var(--ink-faint); font-size: 0.88rem; margin-bottom: 48px; }
.legal h2 {
  font-size: 1.5rem; margin: 44px 0 14px;
}
.legal p, .legal li { color: var(--ink-soft); font-size: 0.97rem; margin-bottom: 14px; }
.legal ul { padding-left: 22px; }

/* ---------- Footer ---------- */
footer { padding: 64px 0 40px; border-top: 1px solid var(--line); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 56px; }
.footer-grid h4 {
  font-size: 0.78rem; font-weight: 600; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--ink-faint); margin-bottom: 18px;
}
.footer-grid a {
  display: block; color: var(--ink-soft); text-decoration: none;
  font-size: 0.9rem; padding: 5px 0;
}
.footer-grid a:hover { color: var(--ink); }
.footer-brand p { color: var(--ink-soft); font-size: 0.9rem; max-width: 300px; margin-top: 14px; }
.footer-bottom {
  border-top: 1px solid var(--line); padding-top: 28px;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  font-size: 0.82rem; color: var(--ink-faint);
}
.footer-bottom a { color: var(--ink-faint); text-decoration: none; }
.footer-bottom a:hover { color: var(--ink); }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .services-grid, .steps, .steps.four, .testimonials-grid, .detail-grid { grid-template-columns: 1fr; }
  .stack-grid { grid-template-columns: repeat(6, 1fr); }
  .stack-grid .cell.tool { font-size: 0.6rem; padding: 4px; }
  .why-grid, .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 32px 0; }
  .stat:nth-child(3) { border-left: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav-links a:not(.btn) { display: none; }
  section { padding: 72px 0; }
  .hero { padding: 80px 0 64px; }
  .page-hero { padding: 64px 0 52px; }
}