/* ============================================================
   FU Money Calculator — Base styles & layout primitives
   ============================================================ */

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

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

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(198,244,50,.06), transparent 60%),
    linear-gradient(180deg, var(--bg-grad-1), var(--bg-grad-2));
  background-attachment: fixed;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: var(--lh-tight);
  letter-spacing: -0.02em;
  margin: 0 0 var(--sp-4);
}

p { margin: 0 0 var(--sp-4); }

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

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

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---- Layout helpers ---- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--sp-5);
}
.container--narrow { max-width: var(--maxw-narrow); }

.section { padding-block: var(--sp-8); }

.eyebrow {
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: .16em;
  font-size: var(--fs-xs);
  font-weight: 700;
  color: var(--accent);
  margin: 0 0 var(--sp-3);
}

.muted { color: var(--text-muted); }
.text-center { text-align: center; }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.tabular { font-variant-numeric: tabular-nums; }

/* skip link */
.skip-link {
  position: absolute; left: var(--sp-4); top: -60px;
  background: var(--accent); color: var(--accent-ink);
  padding: var(--sp-2) var(--sp-4); border-radius: var(--r-sm);
  font-weight: 700; z-index: 200; transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: var(--sp-4); text-decoration: none; }

/* main offset for fixed header */
main { display: block; }