:root {
  color-scheme: light;
  --ink: #182026;
  --muted: #5f6c73;
  --line: #d9e2e7;
  --paper: #f6f8f7;
  --panel: #ffffff;
  --accent: #117c6f;
  --accent-2: #385a92;
  --warn: #8a5a12;
}
* { box-sizing: border-box; }
html { font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; color: var(--ink); background: var(--paper); }
body { margin: 0; line-height: 1.75; overflow-wrap: anywhere; }
a { color: var(--accent-2); text-decoration-thickness: .08em; text-underline-offset: .18em; }
.site-header { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 18px clamp(16px, 4vw, 48px); border-bottom: 1px solid var(--line); background: rgba(255,255,255,.94); position: sticky; top: 0; z-index: 10; }
.brand { font-weight: 800; color: var(--ink); text-decoration: none; letter-spacing: 0; }
.site-nav { display: flex; flex-wrap: wrap; gap: 10px 16px; font-size: 14px; }
.site-nav a { color: var(--ink); text-decoration: none; }
main { max-width: 1120px; margin: 0 auto; padding: 0 clamp(16px, 4vw, 48px) 56px; }
.hero { min-height: 420px; display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(280px, .8fr); gap: 30px; align-items: center; padding: 46px 0 28px; }
.eyebrow { color: var(--accent); font-weight: 800; margin: 0 0 10px; }
h1 { font-size: clamp(32px, 5vw, 58px); line-height: 1.13; letter-spacing: 0; margin: 0 0 18px; }
.lead { font-size: 18px; color: #36454d; max-width: 760px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 10px 16px; border-radius: 6px; background: var(--accent); color: white; font-weight: 700; text-decoration: none; }
.button.secondary { background: #e7eef2; color: var(--ink); }
.signal-panel { min-height: 300px; border: 1px solid var(--line); background: linear-gradient(145deg, #ffffff, #eef5f3); border-radius: 8px; padding: 18px; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; align-content: center; }
.signal-panel span { min-height: 92px; border: 1px solid #c9d8dd; border-radius: 8px; display: grid; place-items: center; font-weight: 800; color: #24434c; background: #fff; }
.notice { border-left: 5px solid var(--warn); background: #fff9ed; padding: 14px 16px; margin: 0 0 22px; border-radius: 6px; }
.content-section { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: clamp(18px, 3vw, 28px); margin: 20px 0; }
.content-section h2 { font-size: 24px; line-height: 1.35; margin: 0 0 12px; }
.content-section p { margin: 10px 0; color: #2e3b42; }
.content-section ul { margin: 10px 0 0; padding-left: 1.2em; }
.section-kicker { color: var(--accent); font-weight: 800; margin-bottom: 6px; }
.definition-block { border-left: 5px solid var(--accent); }
.one-line-box { border: 1px solid #b9d2ce; border-radius: 8px; background: #eef8f5; padding: 14px 16px; margin: 16px 0; }
.one-line-box p { margin: 6px 0 0; font-weight: 700; }
.analogy-box { border: 1px solid #d4dfef; border-radius: 8px; background: #f5f8fc; padding: 16px; margin: 16px 0; }
.analogy-box h3 { margin: 0 0 8px; font-size: 18px; line-height: 1.35; }
.quick-links { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.quick-links a { display: inline-flex; align-items: center; min-height: 40px; padding: 8px 12px; border-radius: 6px; background: #e7eef2; color: var(--ink); text-decoration: none; font-weight: 700; }
.summary-box h2:not(:first-child) { margin-top: 22px; }
.faq-block details { border-top: 1px solid var(--line); padding: 12px 0; }
.faq-block details:first-of-type { border-top: 0; }
.faq-block summary { cursor: pointer; font-weight: 800; }
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.compare-table { width: 100%; min-width: 720px; border-collapse: collapse; font-size: 15px; }
.compare-table th, .compare-table td { border: 1px solid var(--line); padding: 12px; text-align: left; vertical-align: top; }
.compare-table thead th { background: #e7eef2; color: var(--ink); }
.compare-table tbody th { width: 140px; background: #f4f8f8; }
.example-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.example-grid article { border: 1px solid var(--line); border-radius: 8px; background: #fbfdfd; padding: 14px; min-height: 168px; }
.example-grid h3 { margin: 0 0 8px; font-size: 18px; line-height: 1.35; }
.three-card-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.three-card-grid article { border: 1px solid var(--line); border-radius: 8px; background: #fbfdfd; padding: 14px; min-height: 150px; }
.three-card-grid h3 { margin: 0 0 8px; font-size: 18px; line-height: 1.35; }
.checklist { list-style: none; padding-left: 0; display: grid; gap: 9px; }
.checklist li { padding-left: 30px; position: relative; }
.checklist li::before { content: "□"; position: absolute; left: 0; color: var(--accent); font-weight: 800; }
.card-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.card { min-height: 132px; border: 1px solid var(--line); border-radius: 8px; padding: 14px; background: #fbfdfd; text-decoration: none; color: var(--ink); display: flex; flex-direction: column; gap: 8px; }
.card span { font-weight: 800; line-height: 1.4; }
.card small { color: var(--muted); line-height: 1.55; }
.site-footer { border-top: 1px solid var(--line); padding: 26px clamp(16px, 4vw, 48px); background: #ffffff; display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 20px; }
.site-footer p { margin: 6px 0 0; color: var(--muted); }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 10px 14px; align-content: start; }
@media (max-width: 760px) {
  .site-header { align-items: flex-start; flex-direction: column; }
  .hero { grid-template-columns: 1fr; min-height: auto; padding-top: 32px; }
  .signal-panel { min-height: 220px; }
  .card-grid { grid-template-columns: 1fr; }
  .example-grid { grid-template-columns: 1fr; }
  .three-card-grid { grid-template-columns: 1fr; }
  .site-footer { grid-template-columns: 1fr; }
}
@media (max-width: 420px) {
  main { padding-left: 14px; padding-right: 14px; }
  .content-section { padding: 16px; }
  .signal-panel { grid-template-columns: 1fr; }
  .signal-panel span { min-height: 54px; }
}