:root {
  --ink: #1a2330;
  --muted: #5b6b7f;
  --line: #e3e8ef;
  --bg: #f6f8fa;
  --card: #ffffff;
  --steel: #2c6e9e;
  --steel-dark: #1d4e75;
  --amber: #c47a1e;
  --amber-bg: #fdf3e3;
  --green: #1e7d4f;
  --green-bg: #e8f5ee;
  --red: #b03a2e;
  --red-bg: #fbeae8;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  font-size: 16px;
}

a { color: var(--steel); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 1040px; margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header { background: var(--steel-dark); color: #fff; }
.site-header .wrap { display: flex; align-items: center; gap: 24px; padding-top: 12px; padding-bottom: 12px; flex-wrap: wrap; }
.brand { font-weight: 700; font-size: 1.15rem; color: #fff; letter-spacing: .2px; }
.brand .tag { font-weight: 400; color: #bcd3e8; font-size: .8rem; margin-left: 6px; }
.site-header nav { display: flex; gap: 14px; flex-wrap: wrap; font-size: .9rem; }
.site-header nav a { color: #dbe7f3; }
.site-header nav a:hover { color: #fff; text-decoration: underline; }

/* Hero */
.hero { background: linear-gradient(160deg, #1d4e75 0%, #2c6e9e 100%); color: #fff; padding: 42px 0 38px; }
.hero h1 { margin: 0 0 10px; font-size: 2rem; line-height: 1.2; }
.hero p { margin: 0 0 18px; max-width: 640px; color: #d9e7f3; font-size: 1.05rem; }
.search-box { display: flex; gap: 8px; max-width: 520px; }
.search-box input { flex: 1; padding: 12px 14px; border-radius: 8px; border: 1px solid transparent; font-size: 1rem; }
.search-box input:focus { outline: 2px solid var(--amber); }
.hero .hint { margin-top: 10px; font-size: .82rem; color: #bcd3e8; }

/* Cards / grid */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 14px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 16px; }
.card h3 { margin: 0 0 4px; font-size: 1rem; }
.card .count { color: var(--muted); font-size: .82rem; }
.card a { display: inline-block; margin-top: 8px; font-size: .88rem; }

section.block { margin: 34px 0; }
section.block > h2 { font-size: 1.35rem; border-bottom: 2px solid var(--line); padding-bottom: 8px; }

/* Article */
.article { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 30px 32px; }
.crumbs { font-size: .85rem; color: var(--muted); margin-bottom: 14px; }
.crumbs a { color: var(--muted); }
.article h1 { font-size: 1.9rem; margin: 0 0 6px; line-height: 1.25; }
.definition {
  background: var(--amber-bg);
  border-left: 4px solid var(--amber);
  padding: 14px 18px;
  border-radius: 0 8px 8px 0;
  font-size: 1.05rem;
  margin: 16px 0 24px;
}
.article h2 { font-size: 1.25rem; margin: 30px 0 10px; color: var(--steel-dark); }
.article p { margin: 10px 0; }

table.data { width: 100%; border-collapse: collapse; font-size: .92rem; margin: 10px 0 4px; }
table.data th, table.data td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
table.data th { background: #eef3f8; font-weight: 600; }
table.data tr:nth-child(even) td { background: #fafbfd; }
.note { font-size: .82rem; color: var(--muted); margin-top: 6px; }

.proscons { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.proscons > div { border-radius: 10px; padding: 14px 16px; }
.pros { background: var(--green-bg); border: 1px solid #c6e5d3; }
.cons { background: var(--red-bg); border: 1px solid #f0cbc6; }
.proscons h3 { margin: 0 0 8px; font-size: 1rem; }
.pros h3 { color: var(--green); }
.cons h3 { color: var(--red); }
.proscons ul { margin: 0; padding-left: 18px; }

ul.clean { margin: 8px 0; padding-left: 20px; }

/* FAQ */
.faq details { border: 1px solid var(--line); border-radius: 8px; padding: 12px 16px; margin: 8px 0; background: #fbfcfe; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq p { margin: 8px 0 0; }

/* Buy box */
.buy { background: #f2f7fb; border: 1px solid #d3e3f0; border-radius: 10px; padding: 16px 18px; }
.buy ul { margin: 8px 0 0; padding-left: 20px; }
.buy .disclose { font-size: .8rem; color: var(--muted); margin-top: 10px; }
.tag-pill { display: inline-block; background: var(--amber-bg); color: var(--amber); border: 1px solid #eed6ac; border-radius: 999px; font-size: .72rem; padding: 1px 9px; margin-left: 6px; vertical-align: middle; }

/* Diagram */
.diagram { border: 1px solid var(--line); border-radius: 10px; padding: 14px; background: #fbfcfe; }
.diagram svg { width: 100%; height: auto; display: block; }
.diagram .legend { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 10px; font-size: .85rem; color: var(--muted); }
.diagram .legend b { color: var(--steel-dark); }

/* Footer */
.site-footer { margin-top: 48px; padding: 24px 0 40px; border-top: 1px solid var(--line); color: var(--muted); font-size: .85rem; }
.site-footer .disclose { background: var(--amber-bg); border: 1px solid #eed6ac; padding: 12px 14px; border-radius: 8px; color: var(--ink); margin-bottom: 14px; }

.badge { display: inline-block; font-size: .72rem; font-weight: 700; border-radius: 6px; padding: 2px 8px; }
.badge.live { background: var(--green-bg); color: var(--green); border: 1px solid #bfe3cd; }
.badge.planned { background: #eef1f5; color: var(--muted); border: 1px solid var(--line); }

.muted { color: var(--muted); font-size: .85rem; }

.download-btn { display: inline-block; padding: 11px 20px; background: var(--steel); color: #fff; border-radius: 8px; font-weight: 600; text-decoration: none; }
.download-btn:hover { background: var(--steel-dark); text-decoration: none; }

/* Calculator widget */
.calc { background: #f2f7fb; border: 1px solid #d3e3f0; border-radius: 10px; padding: 18px; }
.calc label { display: block; font-size: .85rem; font-weight: 600; margin: 12px 0 4px; color: var(--steel-dark); }
.calc select { width: 100%; max-width: 420px; padding: 9px 10px; border: 1px solid var(--line); border-radius: 6px; font-size: .95rem; background: #fff; color: var(--ink); }
.calc .result { margin-top: 18px; padding: 14px 16px; background: #0f2c43; color: #fff; border-radius: 8px; font-size: 1rem; }
.calc .result b { color: #ffd28a; font-size: 1.25rem; }

@media (max-width: 640px) {
  .article { padding: 20px 18px; }
  .proscons { grid-template-columns: 1fr; }
}