/* ===== Bayesian Consulting — stylesheet ===== */

:root {
  /* Surface & neutrals */
  --bg: #fafbfc;
  --surface: #ffffff;
  --surface-2: #f4f6f8;
  --border: #e4e8ec;
  --border-strong: #d1d8de;

  /* Text */
  --text: #16202b;
  --text-2: #4a5663;
  --text-3: #768290;

  /* Accent — refined slate blue */
  --accent: #5a87b0;
  --accent-deep: #3f6a92;
  --accent-soft: #b8d0e2;
  --accent-mist: #dde9f2;
  --accent-wash: #eff5f9;

  /* Type */
  --serif: "Instrument Serif", "Iowan Old Style", "Georgia", serif;
  --sans: "Manrope", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  /* Rhythm */
  --container-w: 1180px;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 2px rgba(20, 30, 45, 0.04), 0 1px 1px rgba(20, 30, 45, 0.03);
  --shadow-md: 0 10px 30px -12px rgba(40, 60, 90, 0.16), 0 2px 6px rgba(40, 60, 90, 0.05);
  --shadow-lg: 0 24px 50px -18px rgba(40, 60, 90, 0.22), 0 4px 12px rgba(40, 60, 90, 0.06);

  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-weight: 400;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; padding: 0; margin: 0; }
button { font: inherit; background: none; border: 0; cursor: pointer; color: inherit; }

.skip-link {
  position: absolute; top: -100px; left: 16px;
  background: var(--text); color: #fff;
  padding: 10px 14px; border-radius: 8px;
  z-index: 1000;
  transition: top .2s var(--ease);
}
.skip-link:focus { top: 16px; }

.container {
  width: 100%;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 28px;
}

/* ===== Typography ===== */
h1, h2, h3 { font-family: var(--serif); font-weight: 400; margin: 0; letter-spacing: -0.01em; }
h1 {
  font-size: clamp(2.6rem, 6vw, 4.6rem);
  line-height: 1.04;
  letter-spacing: -0.025em;
}
h1 em { font-style: italic; color: var(--accent-deep); font-weight: 400; }
h2 {
  font-size: clamp(2.1rem, 4vw, 3rem);
  line-height: 1.1;
}
h2 em { font-style: italic; color: var(--accent-deep); }
h3 {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1.18rem;
  letter-spacing: -0.005em;
  line-height: 1.3;
}

.eyebrow {
  font-family: var(--sans);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent-deep);
  font-weight: 600;
  margin: 0 0 1.1rem;
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 251, 252, 0.78);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .25s var(--ease), background .25s var(--ease);
}
.site-header.scrolled {
  background: rgba(250, 251, 252, 0.92);
  border-bottom-color: var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 18px;
  padding-bottom: 18px;
  gap: 24px;
}
.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  font-family: var(--serif);
  font-size: 1.32rem;
  letter-spacing: -0.005em;
}
.wordmark-text em { color: var(--accent-deep); font-style: italic; }
.wordmark-hex {
  width: 26px; height: 30px;
  color: var(--accent);
  flex: none;
}
.primary-nav {
  display: flex;
  gap: 36px;
}
.primary-nav a {
  font-size: 0.95rem;
  color: var(--text-2);
  font-weight: 500;
  position: relative;
  padding: 6px 0;
  transition: color .2s var(--ease);
}
.primary-nav a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .25s var(--ease);
}
.primary-nav a:hover { color: var(--text); }
.primary-nav a:hover::after { transform: scaleX(1); }

.nav-toggle { display: none; padding: 8px; }
.nav-toggle span {
  display: block; width: 22px; height: 1.6px;
  background: var(--text);
  margin: 5px 0;
  transition: transform .25s var(--ease), opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-nav {
  display: none;
  flex-direction: column;
  padding: 8px 28px 24px;
  gap: 4px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.mobile-nav a {
  padding: 14px 4px;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  font-size: 1.05rem;
}
.mobile-nav.open { display: flex; }

/* ===== Hero ===== */
.hero {
  position: relative;
  padding: clamp(80px, 14vh, 140px) 0 clamp(90px, 16vh, 150px);
  overflow: hidden;
  isolation: isolate;
}
.hex-field {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: -2;
  pointer-events: none;
  -webkit-mask-image: radial-gradient(ellipse 90% 75% at 70% 35%, #000 30%, transparent 80%);
          mask-image: radial-gradient(ellipse 90% 75% at 70% 35%, #000 30%, transparent 80%);
}
.hex-field polygon {
  fill: none;
  stroke: rgba(90, 135, 176, 0.22);
  stroke-width: 1;
}
.hex-field polygon.accent {
  stroke: rgba(63, 106, 146, 0.55);
  stroke-width: 1.4;
}
.hex-field polygon.filled {
  fill: rgba(184, 208, 226, 0.32);
  stroke: rgba(90, 135, 176, 0.35);
}
.hero-glow {
  position: absolute;
  top: -10%; right: -10%;
  width: 60%; height: 70%;
  background: radial-gradient(circle, var(--accent-mist), transparent 60%);
  z-index: -1;
  pointer-events: none;
  filter: blur(20px);
}
.hero-inner {
  position: relative;
  max-width: 880px;
}
.hero h1 { margin-bottom: 1.4rem; }
.lede {
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  line-height: 1.55;
  color: var(--text-2);
  max-width: 620px;
  margin: 0 0 2.2rem;
}
.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 14px 26px;
  font-size: 0.96rem;
  font-weight: 600;
  border-radius: 999px;
  transition: transform .2s var(--ease), background .2s var(--ease), color .2s var(--ease), box-shadow .25s var(--ease);
  white-space: nowrap;
}
.btn-primary {
  background: var(--text);
  color: var(--bg);
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover {
  background: var(--accent-deep);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn-ghost {
  color: var(--text);
  padding: 14px 18px;
}
.btn-ghost:hover { color: var(--accent-deep); transform: translateX(3px); }

/* ===== Sections — common ===== */
section { padding: clamp(80px, 12vh, 120px) 0; position: relative; }
.section-head {
  max-width: 720px;
  margin-bottom: 64px;
}
.section-head h2 { margin-bottom: 1.1rem; }
.section-lede {
  color: var(--text-2);
  font-size: 1.08rem;
  line-height: 1.55;
  margin: 0;
}

/* ===== Services ===== */
.services {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 32px 32px;
  position: relative;
  overflow: hidden;
  transition: transform .35s var(--ease), border-color .35s var(--ease), box-shadow .35s var(--ease), background .35s var(--ease);
  opacity: 0;
  transform: translateY(18px);
}
.card.in-view { opacity: 1; transform: none; }
.card:nth-child(1) { transition-delay: .05s; }
.card:nth-child(2) { transition-delay: .15s; }
.card:nth-child(3) { transition-delay: .25s; }
.card:nth-child(4) { transition-delay: .35s; }

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 100% 0%, var(--accent-wash), transparent 55%);
  opacity: 0;
  transition: opacity .35s var(--ease);
  pointer-events: none;
}
.card:hover, .card:focus-visible {
  border-color: var(--accent-soft);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  background: var(--surface);
  outline: none;
}
.card:hover::before, .card:focus-visible::before { opacity: 1; }

.card-icon {
  width: 56px;
  height: 64px;
  color: var(--accent);
  margin-bottom: 22px;
  transition: color .3s var(--ease), transform .35s var(--ease);
}
.card:hover .card-icon { color: var(--accent-deep); transform: translateY(-2px); }

.card h3 { margin-bottom: 8px; color: var(--text); }
.card-lede {
  color: var(--text-2);
  font-size: 0.98rem;
  margin: 0 0 18px;
  line-height: 1.55;
}
.card-list {
  border-top: 1px solid var(--border);
  padding-top: 16px;
}
.card-list li {
  position: relative;
  padding: 6px 0 6px 20px;
  font-size: 0.92rem;
  color: var(--text-2);
}
.card-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 13px;
  width: 8px; height: 9px;
  background: var(--accent);
  clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
}

/* ===== About ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 80px;
  align-items: start;
}
.about-text h2 { margin-bottom: 1.5rem; }
.about-text p {
  color: var(--text-2);
  font-size: 1.05rem;
  line-height: 1.7;
  margin: 0 0 1.1rem;
  max-width: 58ch;
}

.about-facts {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 30px;
  position: sticky;
  top: 100px;
}
.about-facts dl {
  margin: 0;
  display: grid;
  gap: 22px;
}
.about-facts .fact {
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border);
}
.about-facts .fact:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}
.about-facts dt {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--text-3);
  font-weight: 600;
  margin-bottom: 6px;
}
.about-facts dd {
  margin: 0;
  font-size: 1rem;
  color: var(--text);
  font-weight: 500;
  line-height: 1.4;
}

/* ===== Contact ===== */
.contact {
  background: linear-gradient(180deg, var(--bg) 0%, var(--accent-wash) 100%);
  text-align: center;
  border-top: 1px solid var(--border);
  overflow: hidden;
  position: relative;
}
.contact::before, .contact::after {
  content: "";
  position: absolute;
  width: 220px; height: 254px;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 28'><polygon points='12,1.5 22.4,7.75 22.4,20.25 12,26.5 1.6,20.25 1.6,7.75' fill='none' stroke='%235a87b0' stroke-width='0.6' opacity='0.45'/></svg>");
  background-size: contain;
  background-repeat: no-repeat;
  opacity: 0.6;
  pointer-events: none;
}
.contact::before { top: 12%; left: -60px; transform: rotate(-12deg); }
.contact::after { bottom: 8%; right: -60px; transform: rotate(15deg); }

.contact-inner {
  max-width: 680px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}
.contact h2 { margin-bottom: 1rem; }
.contact-lede {
  color: var(--text-2);
  font-size: 1.08rem;
  margin: 0 0 2.4rem;
}
.email-link {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 18px 28px;
  border-radius: 999px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  box-shadow: var(--shadow-sm);
  transition: transform .25s var(--ease), border-color .25s var(--ease), box-shadow .3s var(--ease), color .25s var(--ease);
}
.email-link:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  color: var(--accent-deep);
  box-shadow: var(--shadow-md);
}
.email-hex {
  width: 22px; height: 26px;
  color: var(--accent);
  flex: none;
}

/* ===== Footer ===== */
.site-footer {
  padding: 56px 0 40px;
  border-top: 1px solid var(--border);
  background: var(--bg);
}
.footer-tagline {
  font-family: var(--serif);
  font-size: clamp(1.25rem, 2.4vw, 1.75rem);
  line-height: 1.3;
  letter-spacing: -0.005em;
  color: var(--text-2);
  margin: 0 0 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
  max-width: 30ch;
}
.footer-tagline em {
  font-style: italic;
  color: var(--accent-deep);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.88rem;
  color: var(--text-3);
}
.footer-inner a:hover { color: var(--accent-deep); }
.footer-mark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text-2);
  font-weight: 500;
}
.footer-mark svg { width: 18px; height: 21px; color: var(--accent); }

/* ===== Animations on entry ===== */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .8s var(--ease), transform .8s var(--ease);
}
.reveal.in-view { opacity: 1; transform: none; }

/* ===== Responsive ===== */
@media (max-width: 880px) {
  .primary-nav { display: none; }
  .nav-toggle { display: inline-block; }
  .cards { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .about-facts { position: static; }
  .hero { padding-top: 60px; padding-bottom: 80px; }
  .footer-inner { justify-content: flex-start; }
}

@media (max-width: 520px) {
  .container { padding: 0 22px; }
  .btn { padding: 12px 22px; font-size: 0.92rem; }
  .email-link { padding: 16px 22px; font-size: 0.95rem; }
  .card { padding: 28px 24px 26px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
  .card { opacity: 1; transform: none; }
}