/* AI Harms and Society Initiative
   Simple corporate aesthetic, purple palette. */

:root {
  --purple-900: #2a1a4a;
  --purple-700: #4b2e83;
  --purple-600: #5b3a9e;
  --purple-500: #6f4bc4;
  --purple-100: #ece6f7;
  --purple-50:  #f6f3fb;
  --ink:        #1f1b2e;
  --body:       #3a3650;
  --muted:      #6b6680;
  --line:       #e3def0;
  --white:      #ffffff;
  --max:        1080px;
  --radius:     10px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--body);
  background: var(--white);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

.narrow { max-width: 760px; }

h1, h2, h3 {
  color: var(--ink);
  line-height: 1.25;
  margin: 0 0 0.5em;
  font-weight: 700;
}

h1 { font-size: 2.4rem; letter-spacing: -0.02em; }
h2 { font-size: 1.8rem; letter-spacing: -0.01em; }
h3 { font-size: 1.15rem; }

p { margin: 0 0 1.1em; }

a { color: var(--purple-600); }

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.09em;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--purple-600);
  margin: 0 0 0.6em;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
  font-weight: 700;
  font-size: 1rem;
}

.brand-amp { color: var(--purple-500); }

.brand-mark {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--purple-500), var(--purple-700));
  flex: none;
}

.site-nav {
  display: flex;
  gap: 26px;
}

.site-nav a {
  text-decoration: none;
  color: var(--body);
  font-size: 0.92rem;
  font-weight: 500;
}

.site-nav a:hover { color: var(--purple-600); }

/* Hero */
.hero {
  background: linear-gradient(180deg, var(--purple-50), var(--white));
  padding: 80px 0 64px;
  border-bottom: 1px solid var(--line);
}

.hero h1 { max-width: 18ch; }

.lead {
  font-size: 1.15rem;
  color: var(--body);
  max-width: 60ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 10px;
}

.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn-primary {
  background: var(--purple-700);
  color: var(--white);
}

.btn-primary:hover { background: var(--purple-900); }

.btn-secondary {
  background: var(--white);
  color: var(--purple-700);
  border: 1px solid var(--purple-700);
}

.btn-secondary:hover { background: var(--purple-100); }

/* Fact stripe */
.stripe {
  background: var(--purple-700);
  color: var(--purple-100);
}

.facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  padding: 32px 24px;
}

.fact-label {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.74rem;
  font-weight: 600;
  color: #c7b8ee;
  margin: 0 0 0.35em;
}

.fact-body {
  color: var(--white);
  margin: 0;
  font-size: 0.98rem;
}

/* Sections */
.section { padding: 72px 0; }

.section-alt { background: var(--purple-50); }

.section-intro {
  max-width: 62ch;
  font-size: 1.08rem;
}

/* Cards */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin-top: 36px;
}

.card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 24px;
}

.card h3 {
  color: var(--purple-700);
  border-left: 3px solid var(--purple-500);
  padding-left: 12px;
}

.card p { margin: 0; color: var(--body); }

/* Columns / checklist */
.columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 44px;
  margin-top: 36px;
}

.checklist {
  list-style: none;
  padding: 0;
  margin: 0;
}

.checklist li {
  position: relative;
  padding-left: 30px;
  margin-bottom: 16px;
}

.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 4px;
  background: var(--purple-500);
}

.checklist strong { color: var(--ink); }

/* Contact box */
.contact-box {
  margin-top: 28px;
  padding: 22px 24px;
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 4px solid var(--purple-600);
  border-radius: var(--radius);
}

.contact-label {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--purple-600);
  margin: 0 0 0.3em;
}

.contact-box p:last-child { margin: 0; }

/* Footer */
.site-footer {
  background: var(--purple-900);
  color: #cabfe4;
  padding: 44px 0;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--white);
  font-weight: 700;
  margin-bottom: 14px;
}

.footer-note { max-width: 70ch; font-size: 0.9rem; }

.footer-copy { font-size: 0.85rem; margin: 0; color: #a99ccb; }

/* Responsive */
@media (max-width: 860px) {
  .facts { grid-template-columns: 1fr; gap: 18px; }
  .cards { grid-template-columns: 1fr 1fr; }
  .columns { grid-template-columns: 1fr; gap: 32px; }
}

@media (max-width: 640px) {
  h1 { font-size: 1.9rem; }
  h2 { font-size: 1.5rem; }
  .hero { padding: 56px 0 44px; }
  .section { padding: 52px 0; }
  .site-nav { display: none; }
  .cards { grid-template-columns: 1fr; }
}