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

body {
  font-family: ui-sans-serif, system-ui, sans-serif;
  background: #0b1120;
  color: #e2e8f0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
}

a { color: #818cf8; text-decoration: none; }
a:hover { color: #a5b4fc; }

.container { max-width: 760px; margin: 0 auto; padding: 0 1.25rem; width: 100%; flex: 1; display: flex; flex-direction: column; }

.top-nav { display: flex; flex-wrap: wrap; gap: .6rem 1.5rem; padding: 1rem 0 0; font-size: .8rem; }
.top-nav a { color: #94a3b8; }
.top-nav a:hover { color: #f1f5f9; }

header { padding: 1.75rem 0 1.5rem; }
.wordmark { font-size: 1.6rem; font-weight: 700; letter-spacing: -0.02em; color: #f8fafc; }
.wordmark span { color: #34d399; }
.tagline { color: #94a3b8; font-size: .9rem; margin-top: .35rem; }

main { flex: 1; }

/* ── Calculator card ─────────────────────────────────────────────────────── */
.calc-card, .result-card {
  background: #131d33;
  border: 1px solid #1e2d4a;
  border-radius: 16px;
  padding: 1.5rem 1.6rem;
  margin-bottom: 1.25rem;
}
h1 { font-size: 1.45rem; font-weight: 700; color: #f8fafc; letter-spacing: -0.01em; margin-bottom: .4rem; }
.lead { color: #94a3b8; font-size: .95rem; margin-bottom: 1.1rem; }

.calc-form { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.calc-form .field:first-child { grid-column: 1 / -1; }
.field label { display: block; font-size: .8rem; font-weight: 600; color: #cbd5e1; margin-bottom: .35rem; }
.field input, .field select {
  width: 100%; padding: .65rem .8rem; font-size: 1rem;
  background: #0b1120; color: #f1f5f9;
  border: 1px solid #2a3b5e; border-radius: 10px;
}
.field input:focus, .field select:focus { outline: 2px solid #4f46e5; border-color: #4f46e5; }
.calc-form button {
  grid-column: 1 / -1;
  background: #22c55e; color: #052e19; font-weight: 700; font-size: 1rem;
  padding: .8rem; border: none; border-radius: 10px; cursor: pointer;
  transition: background .15s;
}
.calc-form button:hover { background: #16a34a; }

/* ── Results ─────────────────────────────────────────────────────────────── */
.result-hero { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: 1.25rem; }
.result-label { font-size: .75rem; text-transform: uppercase; letter-spacing: .08em; color: #64748b; font-weight: 600; }
.result-big { font-size: 2.4rem; font-weight: 800; color: #34d399; letter-spacing: -0.02em; line-height: 1.1; }
.result-periods { display: flex; flex-direction: column; gap: .25rem; font-size: .85rem; color: #94a3b8; text-align: right; }
.result-periods span { color: #f1f5f9; font-weight: 600; }

.breakdown { width: 100%; border-collapse: collapse; font-size: .92rem; }
.breakdown caption { text-align: left; font-size: .8rem; color: #64748b; margin-bottom: .5rem; }
.breakdown th { text-align: left; font-weight: 500; color: #cbd5e1; padding: .5rem 0; }
.breakdown td { text-align: right; font-variant-numeric: tabular-nums; color: #f1f5f9; padding: .5rem 0; }
.breakdown tr { border-bottom: 1px solid #1e2d4a; }
.breakdown tr.minus td { color: #f87171; }
.breakdown tr.total th, .breakdown tr.total td { font-weight: 700; color: #34d399; border-bottom: none; padding-top: .7rem; font-size: 1rem; }
.breakdown.bands td { padding-left: 1rem; }
.note { font-size: .8rem; color: #64748b; margin-top: .8rem; }

/* ── Ads ─────────────────────────────────────────────────────────────────── */
.ad-slot { margin: 1.5rem 0; text-align: center; min-height: 90px; }

/* ── Content sections ────────────────────────────────────────────────────── */
.content {
  background: #131d33; border: 1px solid #1e2d4a; border-radius: 16px;
  padding: 1.5rem 1.6rem; margin-bottom: 1.25rem;
}
.content h2 {
  display: flex; align-items: center; gap: .6rem;
  font-size: 1.15rem; color: #f1f5f9; margin: 0 0 .7rem;
}
.content h2:not(:first-child) { margin-top: 1.5rem; }
.content h2::before {
  content: ""; flex: none; width: 4px; height: 1.05em;
  border-radius: 2px; background: linear-gradient(#34d399, #059669);
}
.content h3 { font-size: .95rem; color: #e2e8f0; margin: 1rem 0 .2rem; }
.content p { color: #9fb0c4; font-size: .92rem; margin: .5rem 0; }

.chips { display: flex; flex-wrap: wrap; gap: .5rem; margin: .5rem 0; }
.chip {
  background: #0b1120; border: 1px solid #2a3b5e; border-radius: 999px;
  padding: .35rem .85rem; font-size: .85rem; color: #cbd5e1;
  transition: border-color .15s, color .15s;
}
.chip:hover { border-color: #34d399; color: #34d399; }

article > h1 { margin-bottom: .3rem; }
article > .lead { margin-bottom: 1.2rem; }

footer {
  margin-top: 2rem; padding: 1.5rem 0 2rem;
  border-top: 1px solid #1e293b; color: #475569; font-size: .75rem;
}
.footer-nav { display: flex; flex-wrap: wrap; gap: .5rem 1.25rem; margin-bottom: .8rem; font-size: .8rem; }
.footer-nav a { color: #94a3b8; }
.footer-nav a:hover { color: #f1f5f9; }
footer p { margin: .4rem 0; }
footer a { color: #64748b; text-decoration: underline; }

@media (max-width: 560px) {
  .calc-form { grid-template-columns: 1fr; }
  .result-periods { text-align: left; }
  .result-big { font-size: 2rem; }
}