/* shared.css — tokens, typography, nav, footer.
   Loaded by every page. */

:root {
  /* Brand */
  --c-primary:        #0D9488;
  --c-primary-dark:   #0B7C72;
  --c-primary-light:  #2DD4BF;
  --c-accent:         #14B8A6;

  /* Surface — light theme for landing */
  --c-bg:        #FFFFFF;
  --c-bg-soft:   #F9FAFB;
  --c-bg-mute:   #F3F4F6;
  --c-line:      #E5E7EB;

  /* Text */
  --c-text:      #1F2937;
  --c-text-soft: #4B5563;
  --c-text-mute: #6B7280;

  /* Semantic */
  --c-good:    #15803D;
  --c-warn:    #B45309;
  --c-bad:     #B91C1C;

  /* Layout */
  --max-w:    1180px;
  --pad-x:    24px;
  --radius:   8px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow:    0 4px 16px rgba(13,148,136,0.08);

  /* Type scale */
  --fs-xs: 12px;
  --fs-sm: 14px;
  --fs-base: 16px;
  --fs-lg: 18px;
  --fs-xl: 22px;
  --fs-2xl: 30px;
  --fs-3xl: 42px;
  --fs-4xl: 56px;
}

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  font-size: var(--fs-base);
  line-height: 1.6;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a { color: var(--c-primary); text-decoration: none; }
a:hover { color: var(--c-primary-dark); text-decoration: underline; }

/* ---------- Layout primitives ---------- */
.wrap { max-width: var(--max-w); margin: 0 auto; padding: 0 var(--pad-x); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 12px 22px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-weight: 600;
  font-size: var(--fs-base);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  text-decoration: none;
}
.btn:hover { text-decoration: none; }

.btn-primary  { background: var(--c-primary); color: white; }
.btn-primary:hover { background: var(--c-primary-dark); color: white; }

.btn-ghost    { background: transparent; color: var(--c-text); border-color: var(--c-line); }
.btn-ghost:hover { background: var(--c-bg-mute); color: var(--c-text); }

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--c-line);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.nav-brand {
  font-weight: 700;
  font-size: var(--fs-lg);
  letter-spacing: -0.01em;
  color: var(--c-text);
}
.nav-brand strong { color: var(--c-primary); }
.nav-brand:hover { text-decoration: none; }

.nav-links {
  display: flex;
  gap: 28px;
  align-items: center;
  list-style: none;
}
.nav-links a {
  color: var(--c-text-soft);
  font-weight: 500;
  font-size: var(--fs-sm);
}
.nav-links a:hover { color: var(--c-primary); text-decoration: none; }
.nav-links .btn { padding: 8px 16px; font-size: var(--fs-sm); }

.nav-burger {
  display: none;
  border: none;
  background: none;
  cursor: pointer;
  padding: 8px;
}
.nav-burger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--c-text);
  margin: 4px 0;
}

/* ---------- Footer ---------- */
.foot {
  border-top: 1px solid var(--c-line);
  background: var(--c-bg-soft);
  padding: 40px 0 28px;
  margin-top: 80px;
  font-size: var(--fs-sm);
  color: var(--c-text-mute);
}
.foot-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 32px;
}
.foot-brand strong { color: var(--c-primary); font-weight: 700; }
.foot p { line-height: 1.5; margin-bottom: 6px; }
.foot ul { list-style: none; }
.foot li { margin-bottom: 4px; }
.foot a { color: var(--c-text-soft); }
.foot a:hover { color: var(--c-primary); }
.foot-bottom {
  margin-top: 28px;
  padding-top: 16px;
  border-top: 1px solid var(--c-line);
  text-align: center;
  font-size: var(--fs-xs);
}

/* ---------- Disclaimers / banners ---------- */
.banner {
  padding: 12px 16px;
  border-radius: var(--radius);
  border: 1px solid;
  font-size: var(--fs-sm);
  line-height: 1.5;
}
.banner-warn { background: #FFFBEB; border-color: #FCD34D; color: #78350F; }
.banner-info { background: #ECFEFF; border-color: #67E8F9; color: #155E75; }

/* ---------- Verdict colors (used by demo) ---------- */
.v-normal { color: var(--c-good); }
.v-warn   { color: var(--c-warn); }
.v-bad    { color: var(--c-bad); }
.v-uncertain { color: var(--c-text-mute); }

/* ---------- Mobile ---------- */
@media (max-width: 768px) {
  :root { --pad-x: 16px; --fs-3xl: 32px; --fs-4xl: 38px; }

  .nav-burger { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--c-bg);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 16px 16px;
    border-bottom: 1px solid var(--c-line);
  }
  .nav-links.is-open { display: flex; }
  .nav-links li { padding: 10px 4px; border-bottom: 1px solid var(--c-line); }
  .nav-links li:last-child { border-bottom: none; padding-top: 14px; }
  .nav-links .btn { width: 100%; justify-content: center; }

  .foot-grid { grid-template-columns: 1fr; gap: 24px; }
}