/* =========================================================
 * BetterWorld Impact Calculator — shared base styles
 * Used by /calculator (index.html) and /reveal (reveal.html)
 *
 * Fonts mirror betterworld.org exactly:
 *   - Single family "GT Ultra" (the Standard optical cut, registered as a single family)
 *   - Weights 250 / 300 / 400 / 700, all from GT Ultra Standard
 *   - GT Walsheim retained as secondary body fallback only
 * ========================================================= */

@font-face { font-family:'GT Ultra'; font-style:normal; font-weight:250; src:url('/fonts/GT-Ultra-Standard-Thin-Trial.woff2') format('woff2'); font-display:swap; }
@font-face { font-family:'GT Ultra'; font-style:normal; font-weight:300; src:url('/fonts/GT-Ultra-Standard-Light-Trial.woff2') format('woff2'); font-display:swap; }
@font-face { font-family:'GT Ultra'; font-style:normal; font-weight:400; src:url('/fonts/GT-Ultra-Standard-Regular-Trial.woff2') format('woff2'); font-display:swap; }
@font-face { font-family:'GT Ultra'; font-style:italic; font-weight:400; src:url('/fonts/GT-Ultra-Standard-Regular-Italic-Trial.woff2') format('woff2'); font-display:swap; }
@font-face { font-family:'GT Ultra'; font-style:normal; font-weight:700; src:url('/fonts/GT-Ultra-Standard-Bold-Trial.woff2') format('woff2'); font-display:swap; }

@font-face { font-family:'GT Walsheim'; font-style:normal; font-weight:400; src:url('/fonts/GT-Walsheim-Regular-Trial.woff2') format('woff2'); font-display:swap; }
@font-face { font-family:'GT Walsheim'; font-style:normal; font-weight:500; src:url('/fonts/GT-Walsheim-Medium-Trial.woff2') format('woff2'); font-display:swap; }
@font-face { font-family:'GT Walsheim'; font-style:normal; font-weight:700; src:url('/fonts/GT-Walsheim-Bold-Trial.woff2') format('woff2'); font-display:swap; }

/* =========================================================
 * BetterWorld design tokens
 * ========================================================= */
:root {
  /* Core */
  --bw-denim: #3A4E61;
  --bw-denim-75: rgba(58,78,97,0.75);
  --bw-denim-45: rgba(58,78,97,0.45);
  --bw-calm-gray: #F4F6F8;

  /* Action */
  --bw-mission: #007A63;
  --bw-mission-hover: #009F80;
  --bw-mission-on-navy: #00C49E;

  /* Accents */
  --bw-sage-mist:  #D0DDDC;
  --bw-sky-mist:   #C3CEDA;
  --bw-ember-coral:#D58271;
  --bw-sunset-rose:#DEA598;
  --bw-soft-clay:  #F2ECE6;
  --bw-morning-light:#FDF8ED;
  --bw-gold: #E4B920;

  /* Semantic */
  --bw-error:   #B9002E;

  /* Neutrals */
  --bw-ink: #4C4C4C;
  --bw-ink-soft: #888888;
  --bw-placeholder: #C6C6C6;
  --bw-stroke: #DDDDDD;
  --bw-divider: #ECECEC;
  --bw-white: #FFFFFF;
  --bw-bg-snow: #FDFDFD;

  /* Shadows */
  --bw-shadow-card:    0 0 40px 0 rgba(0,0,0,0.10);
  --bw-shadow-floating: 0 0 40px 0 rgba(0,0,0,0.15);
  --bw-shadow-cta:     0 0 35px 0 rgba(0,0,0,0.08);
  --bw-shadow-soft:    0 0 60px 0 rgba(122,122,122,0.15);

  /* Radii */
  --bw-radius-md: 10px;
  --bw-radius-lg: 12px;
  --bw-radius-xl: 20px;
  --bw-radius-2xl: 30px;
  --bw-radius-pill: 9999px;

  /* Fonts */
  --font-display: 'GT Ultra', 'Inter', system-ui, -apple-system, sans-serif;
  --font-mid:     'GT Ultra', 'Inter', system-ui, sans-serif;
  --font-ui:      'GT Ultra', 'Inter', system-ui, sans-serif;
  --font-body:    'GT Ultra', 'GT Walsheim', 'Inter', system-ui, sans-serif;
}

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

html, body {
  height: 100%;
  background: var(--bw-bg-snow);
  color: var(--bw-denim);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.shell {
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  background: var(--bw-bg-snow);
}

/* ─── NAV ─── */
nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 48px;
  background: var(--bw-white);
  border-bottom: 1px solid var(--bw-divider);
}
.logo-mark {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.logo-mark img {
  height: 24px;
  display: block;
}
.nav-cta {
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 700;
  color: var(--bw-white);
  background: var(--bw-mission);
  text-decoration: none;
  border-radius: var(--bw-radius-pill);
  padding: 9px 20px;
  transition: background 0.15s ease;
  letter-spacing: 0.01em;
}
.nav-cta:hover { background: var(--bw-mission-hover); }

/* ─── FOOTER ─── */
footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 48px;
  background: var(--bw-white);
  border-top: 1px solid var(--bw-divider);
  font-family: var(--font-body);
  font-size: 12px;
  color: var(--bw-ink-soft);
}
footer a {
  font-family: var(--font-body);
  font-size: 12px;
  color: var(--bw-ink-soft);
  text-decoration: none;
  transition: color 0.15s;
}
footer a:hover { color: var(--bw-mission); }

@media (max-width: 680px) {
  nav { padding: 14px 22px; }
  .nav-cta { padding: 8px 16px; font-size: 12px; }
  .logo-mark img { height: 22px; }
  footer { padding: 12px 22px; flex-direction: column; gap: 6px; text-align: center; }
}