:root {
  --bg: #f6f8fa;
  --surface: #ffffff;
  --ink: #1a2332;
  --muted: #5a6a7a;
  --brand: #1f6b5c;
  --brand-dark: #154a40;
  --accent: #c9782c;
  --border: #d8e0e8;
  --ok: #1f6b5c;
  --warn: #9a6b1f;
  --focus: #2a7de1;
  --radius: 12px;
  --shadow: 0 8px 24px rgba(26, 35, 50, 0.08);
  --max: 1080px;
  --font: "Segoe UI", system-ui, -apple-system, sans-serif;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}
img { max-width: 100%; height: auto; }
a { color: var(--brand-dark); }
a:hover { color: var(--brand); }
.skip {
  position: absolute; left: -999px; top: auto;
}
.skip:focus { left: 1rem; top: 1rem; z-index: 100; background: #fff; padding: .5rem 1rem; }
.wrap { width: min(100% - 2rem, var(--max)); margin-inline: auto; }
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 50;
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: .85rem 0; flex-wrap: wrap;
}
.logo {
  font-weight: 700; font-size: 1.15rem; text-decoration: none; color: var(--ink);
  display: flex; align-items: center; gap: .5rem;
}
.logo-mark {
  width: 1.75rem; height: 1.75rem; border-radius: 50%;
  background: linear-gradient(135deg, var(--brand), #3a9b88);
  display: inline-block;
}
.nav { display: flex; flex-wrap: wrap; gap: .35rem .9rem; align-items: center; }
.nav a {
  text-decoration: none; color: var(--muted); font-size: .95rem; font-weight: 500;
}
.nav a:hover, .nav a[aria-current="page"] { color: var(--brand-dark); }
.nav .btn { color: #fff; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: .4rem; padding: .65rem 1.15rem; border-radius: 999px;
  border: none; background: var(--brand); color: #fff; font-weight: 600;
  text-decoration: none; cursor: pointer; font-size: .95rem;
}
.btn:hover { background: var(--brand-dark); color: #fff; }
.btn-secondary {
  background: transparent; color: var(--brand-dark);
  border: 1.5px solid var(--brand);
}
.btn-secondary:hover { background: #e8f4f1; color: var(--brand-dark); }
.hero {
  background: linear-gradient(160deg, #e8f4f1 0%, #f6f8fa 55%, #fff7ec 100%);
  padding: 3rem 0 2.5rem; border-bottom: 1px solid var(--border);
}
.hero h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); line-height: 1.2; margin: 0 0 .75rem; }
.hero .lede { font-size: 1.1rem; color: var(--muted); max-width: 42rem; margin: 0 0 1.5rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .75rem; }
.grid {
  display: grid; gap: 1.25rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.25rem 1.35rem; box-shadow: var(--shadow);
}
.card h3 { margin-top: 0; margin-bottom: .4rem; }
.card p { color: var(--muted); margin: 0 0 .75rem; }
.section { padding: 2.5rem 0; }
.section h2 { margin-top: 0; font-size: 1.6rem; }
.muted { color: var(--muted); }
.badge {
  display: inline-block; font-size: .75rem; font-weight: 700;
  letter-spacing: .03em; text-transform: uppercase;
  background: #fff3e0; color: #8a4b12; padding: .2rem .55rem; border-radius: 6px;
}
.badge-affiliate { background: #eef2ff; color: #334; }
.prose { max-width: 44rem; }
.prose h2, .prose h3 { scroll-margin-top: 5rem; }
.prose ul { padding-left: 1.2rem; }
.prose li { margin: .35rem 0; }
.callout {
  border-left: 4px solid var(--brand); background: #eef8f5;
  padding: 1rem 1.15rem; border-radius: 0 var(--radius) var(--radius) 0; margin: 1.25rem 0;
}
.callout.warn { border-left-color: var(--accent); background: #fff7ec; }
.form {
  display: grid; gap: .9rem; max-width: 32rem;
}
label { font-weight: 600; font-size: .92rem; display: grid; gap: .35rem; }
input, select, textarea {
  font: inherit; padding: .65rem .75rem; border: 1px solid var(--border);
  border-radius: 8px; background: #fff; color: var(--ink);
}
input:focus, select:focus, textarea:focus {
  outline: 2px solid var(--focus); outline-offset: 1px;
}
.form-msg { padding: .75rem 1rem; border-radius: 8px; display: none; }
.form-msg.ok { display: block; background: #e8f6ef; color: #145a45; }
.form-msg.err { display: block; background: #fdecea; color: #8a1f1f; }
.quiz-step { display: none; }
.quiz-step.active { display: block; }
.quiz-options { display: grid; gap: .6rem; margin: 1rem 0; }
.quiz-options label {
  font-weight: 500; background: #fff; border: 1px solid var(--border);
  border-radius: 10px; padding: .75rem 1rem; cursor: pointer;
}
.quiz-options label:has(input:checked) {
  border-color: var(--brand); background: #eef8f5;
}
.quiz-options input { margin-right: .5rem; }
.result-box {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.25rem; margin-top: 1rem;
}
.product {
  display: grid; gap: .5rem;
}
.product .price { font-weight: 700; color: var(--brand-dark); }
.site-footer {
  margin-top: 2rem; padding: 2rem 0; background: #15202b; color: #d5dde6;
}
.site-footer a { color: #a8d5c8; }
.footer-grid {
  display: grid; gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}
.footer-note { font-size: .85rem; color: #9aa7b5; margin-top: 1.5rem; }
.toc { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem 1.25rem; }
.toc ol { margin: .5rem 0 0; padding-left: 1.2rem; }
.table-simple { width: 100%; border-collapse: collapse; font-size: .95rem; }
.table-simple th, .table-simple td {
  text-align: left; padding: .55rem .4rem; border-bottom: 1px solid var(--border);
}
@media (max-width: 640px) {
  .nav { width: 100%; }
}