/* HealthAI — shared chrome (nav + footer + buttons + tokens) */

:root {
  --brand-primary: #007AFF;
  --brand-primary-soft: #339CFF;
  --brand-success: #34C759;
  --brand-warning: #FF9500;
  --brand-danger:  #FF3B30;
  --brand-purple:  #AF52DE;
  --brand-gray:    #8E8E93;

  --bg:            #0B0B0F;
  --bg-elev:       #131319;
  --card:          #1A1A21;
  --card-hi:       #22222B;
  --border:        rgba(255,255,255,0.08);
  --border-hi:     rgba(255,255,255,0.14);
  --text:          #F5F5F7;
  --text-2:        #B8B8C0;
  --text-3:        #8E8E93;

  --radius-card:   20px;
  --radius-btn:    12px;
  --radius-pill:   999px;

  --ease:          cubic-bezier(0.4, 0, 0.2, 1);
  --t:             250ms var(--ease);

  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Inter", "Manrope", system-ui, "Segoe UI", Roboto, sans-serif;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg:        #F2F2F7;
    --bg-elev:   #FFFFFF;
    --card:      #FFFFFF;
    --card-hi:   #F8F8FB;
    --border:    rgba(0,0,0,0.07);
    --border-hi: rgba(0,0,0,0.12);
    --text:      #1C1C1E;
    --text-2:    #3C3C43;
    --text-3:    #8E8E93;
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  min-height: 100vh;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
::selection { background: var(--brand-primary); color: #fff; }
:focus-visible {
  outline: 2px solid var(--brand-primary);
  outline-offset: 3px;
  border-radius: 6px;
}

.wrap {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

.grid-decor {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse at 50% 30%, black 30%, transparent 75%);
}
@media (prefers-color-scheme: light) {
  .grid-decor {
    background-image:
      linear-gradient(to right, rgba(0,0,0,0.04) 1px, transparent 1px),
      linear-gradient(to bottom, rgba(0,0,0,0.04) 1px, transparent 1px);
  }
}

/* ─── Nav ─── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  background: color-mix(in oklab, var(--bg) 70%, transparent);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 24px;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.01em;
}
.logo-mark {
  width: 32px; height: 32px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-primary-soft));
  display: grid; place-items: center;
  color: #fff;
  font-weight: 800;
  font-size: 18px;
  box-shadow: 0 4px 14px rgba(0,122,255,0.35), inset 0 1px 0 rgba(255,255,255,0.25);
}
.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
  font-size: 14px;
}
.nav-links a {
  color: var(--text-2);
  transition: color var(--t);
}
.nav-links a:hover { color: var(--text); }
.nav-cta { display: flex; gap: 10px; align-items: center; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-btn);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.005em;
  transition: all var(--t);
  white-space: nowrap;
}
.btn-primary {
  background: var(--brand-primary);
  color: #fff;
  box-shadow: 0 4px 14px rgba(0,122,255,0.32);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(0,122,255,0.45), 0 0 60px rgba(0,122,255,0.25);
  background: var(--brand-primary-soft);
}
.btn-ghost {
  border: 1px solid var(--border-hi);
  color: var(--text);
  background: transparent;
}
.btn-ghost:hover {
  border-color: var(--brand-primary);
  background: color-mix(in oklab, var(--brand-primary) 10%, transparent);
  transform: translateY(-2px);
}
.btn-lg {
  padding: 16px 28px;
  font-size: 16px;
  border-radius: 14px;
}
.btn-block { width: 100%; }

.burger { display: none; }
@media (max-width: 900px) {
  .nav-links { display: none; }
  .nav-cta .btn-ghost { display: none; }
  .burger {
    display: block;
    margin-left: 0;
  }
  .burger summary {
    list-style: none;
    width: 40px; height: 40px;
    border-radius: 10px;
    border: 1px solid var(--border-hi);
    display: grid; place-items: center;
  }
  .burger summary::-webkit-details-marker { display: none; }
  .burger summary svg { width: 18px; height: 18px; }
  .burger[open] .burger-menu { display: flex; }
  .burger-menu {
    display: none;
    position: absolute;
    top: 60px; right: 24px;
    flex-direction: column;
    gap: 4px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 8px;
    min-width: 200px;
    backdrop-filter: blur(24px);
    box-shadow: 0 30px 60px rgba(0,0,0,0.4);
  }
  .burger-menu a {
    padding: 10px 14px;
    border-radius: 8px;
    font-size: 14px;
    color: var(--text-2);
  }
  .burger-menu a:hover { background: var(--card-hi); color: var(--text); }
  .burger-menu hr { border: none; border-top: 1px solid var(--border); margin: 4px 0; }
}

/* ─── Footer ─── */
footer {
  border-top: 1px solid var(--border);
  padding: 60px 0 30px;
  margin-top: 60px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .slogan {
  margin-top: 16px;
  color: var(--text-2);
  font-size: 14px;
  max-width: 320px;
  text-wrap: pretty;
}
.footer-col h4 {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 16px;
}
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.footer-col a { color: var(--text-2); font-size: 14.5px; transition: color var(--t); }
.footer-col a:hover { color: var(--text); }

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 30px;
  border-top: 1px solid var(--border);
  color: var(--text-3);
  font-size: 13px;
  flex-wrap: wrap;
  gap: 16px;
}
.socials { display: flex; gap: 10px; }
.social-btn {
  width: 36px; height: 36px;
  border-radius: 10px;
  border: 1px solid var(--border);
  display: grid; place-items: center;
  color: var(--text-2);
  transition: all var(--t);
}
.social-btn:hover {
  color: var(--brand-primary);
  border-color: var(--brand-primary);
  transform: translateY(-2px);
}
.social-btn svg { width: 16px; height: 16px; }

@media (max-width: 800px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: span 2; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-brand { grid-column: span 1; }
}

/* ─── Tablet & Mobile polish ─── */
@media (max-width: 1024px) {
  .wrap { padding: 0 20px; }
}
@media (max-width: 720px) {
  nav { padding: 14px 0; }
  .logo { font-size: 16px; }
  .logo-mark { width: 28px; height: 28px; font-size: 14px; }
  .nav-cta .btn { padding: 9px 14px; font-size: 13.5px; }
  .lang-switcher summary { padding: 6px 8px; font-size: 13px; }
  .lang-switcher .flag { font-size: 14px; }
  .burger-menu { right: 16px; }
  footer { padding: 48px 0 24px; margin-top: 40px; }
  .footer-grid { gap: 28px; margin-bottom: 28px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; gap: 12px; }
}
@media (max-width: 480px) {
  .wrap { padding: 0 16px; }
  .nav-cta { gap: 8px; }
  .nav-cta .btn { padding: 8px 12px; font-size: 13px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}