:root {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #172033;
  background: #f4f7fb;
  line-height: 1.6;
  --surface: #ffffff;
  --line: #dce4ef;
  --muted: #60708a;
  --accent: #1f6feb;
  --accent-dark: #164ea6;
  --soft: #eaf2ff;
  --warn: #fff8df;
  --shadow: 0 18px 45px rgba(29, 53, 87, .09);
}

* { box-sizing: border-box; }
body { margin: 0; }
button, input, select { font: inherit; }
button { cursor: pointer; }

.wrap { width: min(1120px, calc(100% - 32px)); margin-inline: auto; }
.hero { padding: 54px 0 38px; background: linear-gradient(135deg, #f8fbff 0%, #e8f1ff 100%); border-bottom: 1px solid var(--line); }
.eyebrow { margin: 0 0 8px; color: var(--accent); font-size: .78rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
h1 { margin: 0; font-size: clamp(2rem, 5vw, 3.4rem); line-height: 1.12; }
.lead { max-width: 760px; margin: 14px 0 20px; color: var(--muted); font-size: 1.08rem; }
.notice { padding: 11px 14px; border: 1px solid #ecd98b; border-radius: 12px; background: var(--warn); max-width: 780px; }

.layout { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(320px, .9fr); gap: 22px; padding-block: 28px 48px; align-items: start; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 20px; padding: 24px; box-shadow: var(--shadow); }
.result-card { position: sticky; top: 18px; }
.full { grid-column: 1 / -1; }
.section-head { display: flex; gap: 12px; align-items: flex-start; margin-bottom: 20px; }
.section-head h2 { margin: 0; font-size: 1.45rem; }
.section-head p { margin: 2px 0 0; color: var(--muted); font-size: .92rem; }
.step { display: grid; place-items: center; width: 34px; height: 34px; flex: 0 0 34px; border-radius: 10px; background: var(--soft); color: var(--accent); font-weight: 800; }

.grid { display: grid; gap: 18px; }
.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
label { display: grid; gap: 7px; font-weight: 700; }
select { width: 100%; padding: 11px 12px; border: 1px solid var(--line); border-radius: 11px; background: #fff; }
.range-row { display: grid; grid-template-columns: 1fr 60px; gap: 10px; align-items: center; }
.range-row output { text-align: right; font-variant-numeric: tabular-nums; color: var(--accent-dark); font-weight: 800; }
input[type="range"] { width: 100%; accent-color: var(--accent); }
.check-label { grid-template-columns: auto 1fr; align-items: center; align-self: end; min-height: 46px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 11px; font-weight: 650; }
.check-label input { width: 18px; height: 18px; }
hr { border: 0; border-top: 1px solid var(--line); margin: 24px 0; }
h3 { margin: 0 0 12px; }

.usage-list { display: grid; gap: 10px; }
.usage-item { display: grid; grid-template-columns: minmax(160px, .85fr) 1fr 58px; gap: 12px; align-items: center; padding: 12px; border: 1px solid var(--line); border-radius: 12px; }
.usage-item span { display: grid; }
.usage-item small { color: var(--muted); font-weight: 500; }
.usage-item output { text-align: right; font-variant-numeric: tabular-nums; font-weight: 800; }
details { margin-top: 18px; padding: 12px 14px; background: #f8fafc; border: 1px solid var(--line); border-radius: 12px; }
summary { cursor: pointer; font-weight: 800; }
.detail-grid { margin-top: 16px; }

.primary, .secondary { border: 0; border-radius: 12px; padding: 12px 16px; font-weight: 800; }
.primary { width: 100%; margin-top: 20px; background: var(--accent); color: #fff; }
.primary:hover { background: var(--accent-dark); }
.secondary { width: 100%; background: var(--soft); color: var(--accent-dark); margin-top: 10px; }
.secondary:hover { filter: brightness(.97); }

.empty-state { padding: 34px 18px; border: 1px dashed #bfcadc; border-radius: 14px; color: var(--muted); text-align: center; }
.big-result { padding: 18px; background: var(--soft); border-radius: 16px; text-align: center; }
.big-result span { display: block; color: var(--muted); font-size: .9rem; }
.big-result strong { display: block; margin: 4px 0 2px; font-size: 2.6rem; line-height: 1.2; }
.big-result p { margin: 0; }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin: 14px 0; }
.stats div { padding: 10px; border: 1px solid var(--line); border-radius: 12px; text-align: center; }
.stats dt { color: var(--muted); font-size: .75rem; }
.stats dd { margin: 2px 0 0; font-weight: 800; }
.recommendation { padding: 15px; border-left: 4px solid var(--accent); background: #f8fbff; border-radius: 10px; }
.recommendation h3 { margin: 2px 0 4px; }
.recommendation p { margin: 0; color: var(--muted); }
.kicker { color: var(--accent); font-size: .75rem; font-weight: 900; text-transform: uppercase; letter-spacing: .06em; }
.compare-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 14px; }
.compare-grid section { padding: 13px; border: 1px solid var(--line); border-radius: 13px; }
.compare-grid h4 { margin: 0 0 6px; }
.score { display: flex; align-items: baseline; gap: 6px; }
.score span { font-size: 1.7rem; font-weight: 900; }
.score small { color: var(--muted); }
.compare-grid ul { min-height: 78px; padding-left: 1.1rem; color: var(--muted); font-size: .82rem; }
.affiliate-note { margin-top: 12px; padding: 10px; background: #fff9e8; border-radius: 10px; font-size: .78rem; }
.source-card p, .source-card li { color: var(--muted); }
.small { font-size: .82rem; }
.toast { position: fixed; left: 50%; bottom: 22px; transform: translateX(-50%); max-width: min(520px, calc(100% - 32px)); padding: 12px 16px; border-radius: 12px; background: #172033; color: white; box-shadow: var(--shadow); z-index: 10; }

@media (max-width: 820px) {
  .layout { grid-template-columns: 1fr; }
  .result-card { position: static; }
  .grid.two, .compare-grid { grid-template-columns: 1fr; }
  .usage-item { grid-template-columns: 1fr 58px; }
  .usage-item input { grid-column: 1 / -1; grid-row: 2; }
  .usage-item output { grid-column: 2; grid-row: 1; }
}

@media (max-width: 520px) {
  .wrap { width: min(100% - 20px, 1120px); }
  .hero { padding-top: 34px; }
  .card { padding: 18px; border-radius: 16px; }
  .stats { grid-template-columns: 1fr; }
}

.destination-tip { margin-top: 12px; padding: 12px 14px; background: #f7f9fc; border: 1px solid var(--line); border-radius: 12px; color: var(--muted); font-size: .88rem; }
.info-card h2 { margin-top: 0; }
.info-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.info-grid > div { padding: 16px; border: 1px solid var(--line); border-radius: 14px; }
.info-grid h3 { margin: 0 0 6px; font-size: 1rem; }
.info-grid p { margin: 0; color: var(--muted); }
.site-footer { border-top: 1px solid var(--line); background: #fff; }
.footer-inner { display: flex; justify-content: space-between; gap: 18px; align-items: center; padding-block: 22px; color: var(--muted); font-size: .88rem; }
.footer-inner p { margin: 0; font-weight: 800; color: #172033; }
.footer-inner nav { display: flex; gap: 16px; flex-wrap: wrap; }
a { color: var(--accent-dark); }
@media (max-width: 700px) {
  .info-grid { grid-template-columns: 1fr; }
  .footer-inner { align-items: flex-start; flex-direction: column; }
}