/* VerityAuth.ai — Clinical Trust design system
   Matches the product UI: white surfaces, restrained clinical palette,
   violet used as a disciplined accent. */

:root {
  --ink: #0f172a;
  --body: #475569;
  --muted: #64748b;
  --faint: #94a3b8;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --violet: #7c3aed;
  --violet-dark: #6d28d9;
  --violet-soft: #f5f3ff;
  --violet-border: #ddd6fe;
  --green: #059669;
  --green-soft: #ecfdf5;
  --amber: #d97706;
  --amber-soft: #fffbeb;
  --red: #dc2626;
  --red-soft: #fef2f2;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.12);
  --max: 1120px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--body);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: var(--violet); text-decoration: none; }
a:hover { text-decoration: underline; }

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

/* ---------- Typography ---------- */

h1, h2, h3, h4 { color: var(--ink); line-height: 1.15; letter-spacing: -0.02em; }

h1 { font-size: clamp(36px, 5vw, 56px); font-weight: 800; }
h2 { font-size: clamp(28px, 3.5vw, 40px); font-weight: 800; }
h3 { font-size: 20px; font-weight: 700; letter-spacing: -0.01em; }

.eyebrow {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--violet);
  margin-bottom: 16px;
}

.lede { font-size: 18px; color: var(--body); }

.section { padding: 96px 0; }
.section.alt { background: var(--bg-alt); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-head { max-width: 720px; margin-bottom: 56px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head p { margin-top: 16px; }

.cite {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  color: var(--faint);
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  padding: 12px 22px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
  white-space: nowrap;
}
.btn:hover { text-decoration: none; }

.btn-primary { background: var(--violet); color: #fff; }
.btn-primary:hover { background: var(--violet-dark); }

.btn-secondary { background: #fff; color: var(--ink); border-color: var(--border-strong); }
.btn-secondary:hover { border-color: var(--faint); background: var(--bg-alt); }

.btn-lg { padding: 14px 28px; font-size: 16px; }

/* ---------- Nav ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex;
  align-items: center;
  gap: 32px;
  height: 68px;
}
.logo {
  display: flex;
  align-items: center;
  font-size: 18px;
  font-weight: 800;
  color: var(--ink);
  letter-spacing: -0.02em;
}
.logo svg { margin-right: 10px; }
.logo:hover { text-decoration: none; }
.logo .ai { color: var(--violet); }
.nav-links { display: flex; gap: 28px; margin-left: auto; }
.nav-links a { font-size: 14.5px; font-weight: 500; color: var(--body); }
.nav-links a:hover { color: var(--ink); text-decoration: none; }
.nav-actions { display: flex; gap: 12px; }
.nav .btn { padding: 9px 18px; font-size: 14px; }

/* ---------- Hero ---------- */

.hero { padding: 88px 0 0; text-align: center; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--violet);
  background: var(--violet-soft);
  border: 1px solid var(--violet-border);
  border-radius: 999px;
  padding: 6px 14px;
  margin-bottom: 24px;
}
.hero-badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); }
.hero h1 { max-width: 840px; margin: 0 auto 24px; }
.hero .lede { max-width: 680px; margin: 0 auto 32px; }
.hero-ctas { display: flex; gap: 14px; justify-content: center; margin-bottom: 36px; flex-wrap: wrap; }
.hero-checks {
  display: flex;
  gap: 28px;
  justify-content: center;
  flex-wrap: wrap;
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 64px;
}
.hero-checks span { display: inline-flex; align-items: center; gap: 8px; }
.hero-checks svg { color: var(--green); flex-shrink: 0; }

.browser-frame {
  max-width: 1040px;
  margin: 0 auto;
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: 14px 14px 0 0;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  background: #fff;
}
.browser-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
}
.browser-bar .b-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--border-strong); }
.browser-bar .b-url {
  margin-left: 12px;
  font-size: 12px;
  color: var(--muted);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 14px;
}

/* ---------- Stat band ---------- */

.stat-band { border-top: 1px solid var(--border); }
.stat-pair {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 40px;
  align-items: center;
  max-width: 860px;
  margin: 0 auto 20px;
}
.stat-big { text-align: center; }
.stat-big .num {
  font-size: clamp(64px, 8vw, 96px);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--ink);
}
.stat-big .num.accent { color: var(--violet); }
.stat-big .label { font-size: 16px; color: var(--body); margin-top: 8px; }
.stat-big .cite { margin-top: 6px; }
.stat-divider { width: 1px; height: 120px; background: var(--border); }
.stat-bridge {
  text-align: center;
  font-size: 17px;
  color: var(--ink);
  font-weight: 500;
  max-width: 560px;
  margin: 24px auto 0;
}

/* ---------- Card grids ---------- */

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }

.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}
.card h3 { margin-bottom: 10px; }
.card p { font-size: 15px; }
.card .cite { margin-top: 12px; }

.icon-tile {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--violet-soft);
  color: var(--violet);
  margin-bottom: 18px;
}
.icon-tile.green { background: var(--green-soft); color: var(--green); }
.icon-tile.amber { background: var(--amber-soft); color: var(--amber); }
.icon-tile.red { background: var(--red-soft); color: var(--red); }

/* ---------- Mini stats row ---------- */

.ministat { text-align: center; padding: 24px 12px; }
.ministat .num { font-size: 40px; font-weight: 800; letter-spacing: -0.03em; color: var(--ink); }
.ministat .label { font-size: 13.5px; color: var(--muted); margin-top: 4px; }
.ministat .cite { margin-top: 4px; }

/* ---------- Workflow steps ---------- */

.steps { max-width: 880px; margin: 0 auto; }
.step {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 24px;
  padding: 32px 0;
  border-bottom: 1px solid var(--border);
}
.step:last-child { border-bottom: none; }
.step-num {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--violet);
  color: #fff;
  font-weight: 700;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.step-head { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; margin-bottom: 6px; }
.step-head h3 { font-size: 22px; }
.time-chip {
  font-size: 12px;
  font-weight: 600;
  color: var(--green);
  background: var(--green-soft);
  border-radius: 999px;
  padding: 3px 12px;
}
.step .tagline { font-weight: 600; color: var(--ink); margin-bottom: 10px; }
.step p { font-size: 15px; margin-bottom: 14px; }
.step-roles { display: grid; gap: 8px; font-size: 14px; }
.step-roles div { display: grid; grid-template-columns: 96px 1fr; gap: 12px; }
.step-roles dt { font-weight: 700; color: var(--ink); font-size: 13px; text-transform: uppercase; letter-spacing: 0.04em; padding-top: 1px; }
.step-roles dd { color: var(--body); }

/* ---------- Personas ---------- */

.persona-card { padding: 0; overflow: hidden; display: flex; flex-direction: column; }
.persona-shot { border-bottom: 1px solid var(--border); background: var(--bg-alt); }
.persona-shot img { width: 100%; height: 200px; object-fit: cover; object-position: top left; }
.persona-body { padding: 24px 24px 28px; }
.persona-role { font-size: 12px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--violet); margin-bottom: 8px; }
.persona-body h3 { margin-bottom: 14px; }
.persona-body ul { list-style: none; display: grid; gap: 10px; }
.persona-body li { display: flex; gap: 10px; font-size: 14.5px; }
.persona-body li svg { color: var(--green); flex-shrink: 0; margin-top: 3px; }

/* ---------- Impact ---------- */

.impact-hero { text-align: center; margin-bottom: 48px; }
.impact-hero .label { font-size: 13px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); }
.impact-hero .num {
  font-size: clamp(56px, 7vw, 88px);
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--green);
  line-height: 1.1;
  margin: 8px 0 4px;
}
.impact-hero .sub { color: var(--body); }
.impact-math {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 20px;
  font-size: 14px;
  color: var(--muted);
}
.impact-math .chip {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 16px;
  font-weight: 600;
  color: var(--ink);
}

.data-table { max-width: 720px; margin: 48px auto 0; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: #fff; }
.data-table .row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px;
  padding: 14px 22px;
  font-size: 14.5px;
  border-bottom: 1px solid var(--border);
}
.data-table .row:last-child { border-bottom: none; }
.data-table .row.total { background: var(--violet-soft); }
.data-table .k { color: var(--body); }
.data-table .v { font-weight: 700; color: var(--ink); text-align: right; }
.data-table .row.total .v { color: var(--violet); }

/* ---------- Included list ---------- */

.included { columns: 2; column-gap: 48px; max-width: 880px; margin: 0 auto; }
.included li {
  display: flex;
  gap: 10px;
  font-size: 15px;
  padding: 7px 0;
  break-inside: avoid;
  list-style: none;
}
.included li svg { color: var(--green); flex-shrink: 0; margin-top: 4px; }

/* ---------- Security band ---------- */

.security-band { background: var(--ink); color: #cbd5e1; }
.security-band h2 { color: #fff; }
.security-band .section-head p { color: #94a3b8; }
.security-items { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; }
.security-items div { text-align: center; font-size: 13.5px; line-height: 1.45; }
.security-items svg { color: #a78bfa; margin: 0 auto 10px; display: block; }
.security-items strong { display: block; color: #fff; font-size: 14px; margin-bottom: 4px; }

/* ---------- FAQ ---------- */

.faq-list { max-width: 760px; margin: 0 auto; }
.faq-list details {
  border-bottom: 1px solid var(--border);
  padding: 4px 0;
}
.faq-list summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--ink);
  font-size: 16.5px;
  padding: 18px 32px 18px 0;
  list-style: none;
  position: relative;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 22px;
  font-weight: 400;
  color: var(--faint);
}
.faq-list details[open] summary::after { content: "–"; }
.faq-list details p { padding: 0 0 20px; font-size: 15px; max-width: 700px; }

/* ---------- Contact ---------- */

.contact-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 64px; align-items: start; }
.contact-side h2 { margin-bottom: 16px; }
.contact-side p { margin-bottom: 24px; }
.demo-box {
  background: var(--violet-soft);
  border: 1px solid var(--violet-border);
  border-radius: var(--radius);
  padding: 24px;
  margin-top: 8px;
}
.demo-box strong { color: var(--ink); display: block; margin-bottom: 6px; }
.demo-box p { font-size: 14.5px; margin-bottom: 16px; }

.form-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow-md); }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field.full { grid-column: 1 / -1; }
.field label { font-size: 13.5px; font-weight: 600; color: var(--ink); }
.field input, .field select, .field textarea {
  font-family: inherit;
  font-size: 15px;
  color: var(--ink);
  padding: 11px 14px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: #fff;
  width: 100%;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: 2px solid var(--violet);
  outline-offset: -1px;
  border-color: var(--violet);
}
.field textarea { resize: vertical; min-height: 90px; }
.form-card .btn { width: 100%; margin-top: 20px; }
.form-note { font-size: 12.5px; color: var(--faint); text-align: center; margin-top: 12px; }
.form-success {
  display: none;
  background: var(--green-soft);
  border: 1px solid #a7f3d0;
  color: var(--green);
  font-weight: 600;
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  margin-top: 16px;
  font-size: 14.5px;
}

/* ---------- Footer ---------- */

footer { border-top: 1px solid var(--border); padding: 48px 0; background: var(--bg-alt); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.footer-links { display: flex; gap: 24px; flex-wrap: wrap; }
.footer-links a { font-size: 14px; color: var(--muted); }
.footer-links a:hover { color: var(--ink); text-decoration: none; }
.footer-copy { font-size: 13px; color: var(--faint); }

/* ---------- Legal pages ---------- */

.legal { max-width: 760px; margin: 0 auto; padding: 72px 24px 96px; }
.legal h1 { font-size: 36px; margin-bottom: 8px; }
.legal .updated { color: var(--faint); font-size: 14px; margin-bottom: 40px; }
.legal h2 { font-size: 22px; margin: 40px 0 12px; }
.legal p, .legal li { font-size: 15.5px; margin-bottom: 12px; }
.legal ul { padding-left: 22px; margin-bottom: 16px; }

/* ---------- Motion & craft ---------- */

.hero {
  background:
    radial-gradient(ellipse 80% 55% at 50% -10%, rgba(124, 58, 237, 0.07), transparent 70%),
    radial-gradient(ellipse 50% 40% at 85% 0%, rgba(37, 99, 235, 0.05), transparent 70%);
}

.grad {
  background: linear-gradient(92deg, var(--violet) 0%, #4f46e5 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.card { transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease; }
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--border-strong); }

.btn-primary { box-shadow: 0 1px 2px rgba(109, 40, 217, 0.3); }
.btn-primary:hover { box-shadow: 0 4px 14px rgba(109, 40, 217, 0.35); }

.browser-frame { box-shadow: 0 24px 70px rgba(15, 23, 42, 0.16), 0 4px 16px rgba(15, 23, 42, 0.08); }

.nav.scrolled { box-shadow: 0 2px 12px rgba(15, 23, 42, 0.06); }

/* Scroll reveal — the .reveal class is added by JS, so content is fully
   visible without JS and for reduced-motion users. */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.55s ease, transform 0.55s ease; }
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: 0.08s; }
.reveal.d2 { transition-delay: 0.16s; }
.reveal.d3 { transition-delay: 0.24s; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .card { transition: none; }
  .card:hover { transform: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Responsive ---------- */

@media (max-width: 960px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .security-items { grid-template-columns: repeat(3, 1fr); row-gap: 32px; }
  .nav-links { display: none; }
}

@media (max-width: 760px) {
  .section { padding: 64px 0; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .stat-pair { grid-template-columns: 1fr; gap: 24px; }
  .stat-divider { display: none; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .form-grid { grid-template-columns: 1fr; }
  .included { columns: 1; }
  .security-items { grid-template-columns: repeat(2, 1fr); }
  .step { grid-template-columns: 1fr; gap: 12px; }
  .step-roles div { grid-template-columns: 1fr; gap: 2px; }
  .hero { padding-top: 56px; }
  .hero-checks { flex-direction: column; align-items: center; gap: 10px; }
}

@media (max-width: 560px) {
  .nav-actions .btn-secondary { display: none; }
}