:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #5b6475;
  --line: #dbe3f0;
  --bg: #f6f8fc;
  --card: #ffffff;
  --accent: #2364d2;
  --accent-dark: #17499c;
  --soft: #eaf1ff;
  --success: #0f7b5f;
  --shadow: 0 18px 50px rgba(31, 48, 82, 0.12);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at top left, #e8f0ff 0, transparent 34rem), var(--bg);
}

a { color: var(--accent); }
.page-shell { width: min(1120px, calc(100% - 32px)); margin: 0 auto; padding: 24px 0 40px; }
.site-nav { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 12px 14px; margin-bottom: 24px; background: rgba(255,255,255,.86); border: 1px solid var(--line); border-radius: 22px; box-shadow: 0 10px 24px rgba(31,48,82,.08); backdrop-filter: blur(12px); }
.site-brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 800; text-decoration: none; }
.brand-mark { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 12px; background: var(--accent); color: #fff; }
.crumb { color: var(--muted); font-size: .95rem; margin-bottom: 18px; }
.hero { padding: 24px 0 18px; }
.eyebrow { display: inline-flex; color: var(--accent-dark); font-weight: 800; background: var(--soft); border-radius: 999px; padding: 8px 12px; }
h1 { font-size: clamp(2.2rem, 7vw, 4.5rem); line-height: .95; margin: 18px 0 14px; letter-spacing: -0.06em; }
.hero p { max-width: 760px; color: var(--muted); font-size: clamp(1.05rem, 2vw, 1.25rem); line-height: 1.6; }
.tool-card, .lookup-card, .chart-card, .faq, .related, .content-grid article { background: var(--card); border: 1px solid var(--line); border-radius: 28px; box-shadow: var(--shadow); }
.tool-card { padding: 22px; }
.tool-heading { display: flex; justify-content: space-between; gap: 16px; align-items: flex-start; margin-bottom: 18px; }
.tool-heading h2, .content-grid h2, .chart-card h2, .faq h2, .related h2 { margin: 0 0 8px; font-size: 1.35rem; }
.tool-heading p, .content-grid p, .chart-intro { margin: 0; color: var(--muted); line-height: 1.55; }
.sample-btn, .preset-row button { border: 0; background: var(--accent); color: #fff; border-radius: 999px; padding: 11px 14px; font-weight: 800; cursor: pointer; white-space: nowrap; }
.sample-btn:hover, .preset-row button:hover { background: var(--accent-dark); }
.form-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
label { display: grid; gap: 7px; font-weight: 800; color: #2b3447; }
select, input { width: 100%; border: 1px solid var(--line); border-radius: 15px; padding: 13px 12px; font: inherit; background: #fff; color: var(--ink); }
.preset-row { display: flex; flex-wrap: wrap; gap: 10px; margin: 16px 0; }
.preset-row button { background: #eff4ff; color: var(--accent-dark); border: 1px solid #d4e2ff; }
.results { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 14px; margin-top: 16px; }
.results article, .summary-grid div { background: #f8fbff; border: 1px solid var(--line); border-radius: 20px; padding: 16px; }
.results span, .summary-grid span { display: block; color: var(--muted); font-size: .92rem; margin-bottom: 7px; }
.results strong, .summary-grid strong { display: block; font-size: 1.1rem; line-height: 1.35; }
.result-main { background: linear-gradient(135deg, #eff5ff, #ffffff) !important; }
.result-main strong { font-size: clamp(1.15rem, 2.5vw, 1.55rem); }
.result-main p { margin: 8px 0 0; color: var(--muted); }
.summary-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 14px; }
.comparison { margin: 16px 0 0; color: var(--success); font-weight: 800; line-height: 1.5; }
.lookup-card, .chart-card, .faq, .related { margin-top: 20px; padding: 22px; }
.stack-grid { grid-template-columns: repeat(2, 1fr); }
.lookup-result { margin-top: 16px; padding: 16px; border-radius: 20px; background: #f3fbf8; border: 1px solid #ccece1; }
.lookup-result strong { display: block; margin-bottom: 6px; }
.lookup-result span { color: var(--muted); line-height: 1.5; }
.content-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-top: 20px; }
.content-grid article { padding: 22px; }
li { margin: 8px 0; line-height: 1.5; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 18px; }
table { width: 100%; border-collapse: collapse; min-width: 680px; }
th, td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--line); }
th { background: #eef4ff; font-size: .9rem; text-transform: uppercase; letter-spacing: .04em; }
tr:last-child td { border-bottom: 0; }
details { border-top: 1px solid var(--line); padding: 14px 0; }
details:first-of-type { border-top: 0; }
summary { cursor: pointer; font-weight: 800; }
details p { color: var(--muted); line-height: 1.55; margin-bottom: 0; }
.related p { margin-bottom: 0; line-height: 1.7; }
footer { margin-top: 28px; color: var(--muted); text-align: center; }

@media (max-width: 780px) {
  .page-shell { width: min(100% - 22px, 1120px); padding-top: 14px; }
  .site-nav, .tool-heading { align-items: stretch; flex-direction: column; }
  .form-grid, .results, .summary-grid, .content-grid, .stack-grid { grid-template-columns: 1fr; }
  .sample-btn { width: 100%; }
  h1 { letter-spacing: -0.045em; }
}