*, *::before, *::after { box-sizing: border-box; }

:root {
  --navy: #1a2744;
  --ink: #1a2744;
  --muted: #3e4a5c;
  --teal: #0b6e58;
  --teal-bright: #00d4aa;
  --bg: #f3f5f8;
  --card: #ffffff;
  --line: #e1e6ee;
  --max: 740px;
}

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  min-height: 100vh;
}

a { color: var(--teal); }
a:hover { color: var(--navy); }

a:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
}

.site-header {
  background: linear-gradient(135deg, #0d1525 0%, #1a2744 58%, #14352d 100%);
  color: #fff;
}

.site-header-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 18px 20px 16px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 20px;
}

.logo {
  color: #fff;
  text-decoration: none;
  font-weight: 800;
  letter-spacing: -0.03em;
  font-size: 1.15rem;
}

.logo span { color: var(--teal-bright); }

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
}

.site-nav a {
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 600;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--teal-bright);
}

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 24px 20px 56px;
}

.crumb {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0 0 14px;
}

article,
.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 28px 26px 34px;
  box-shadow: 0 4px 24px rgba(26, 39, 68, 0.06);
}

h1 {
  font-size: 1.9rem;
  line-height: 1.25;
  letter-spacing: -0.03em;
  margin: 0 0 12px;
}

.lede {
  font-size: 1.08rem;
  color: var(--muted);
  margin-top: 0;
}

.updated {
  color: var(--muted);
  font-size: 0.92rem;
}

h2 {
  font-size: 1.25rem;
  line-height: 1.35;
  margin: 1.7em 0 0.45em;
}

h3 {
  font-size: 1.05rem;
  margin: 1.25em 0 0.35em;
}

p { margin: 0 0 0.95em; }

ul, ol {
  margin: 0 0 1em;
  padding-left: 1.25em;
}

li { margin: 0 0 0.45em; }

.guide-cards {
  list-style: none;
  padding: 0;
  margin: 1.2em 0 0;
}

.guide-cards li {
  border-top: 1px solid var(--line);
  padding: 14px 0;
  margin: 0;
}

.guide-cards a {
  font-weight: 700;
  text-decoration: none;
}

.guide-cards p {
  margin: 0.25em 0 0;
  color: var(--muted);
}

.contact-email {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  margin: 0.2em 0 0.8em;
}

.url, code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.86em;
  word-break: break-word;
}

.callout {
  background: #f2fbf7;
  border: 1px solid #c9eadc;
  border-radius: 12px;
  padding: 12px 14px;
  margin: 0 0 1em;
}

.ad-container {
  margin: 28px 0 8px;
  min-height: 90px;
  text-align: center;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 22px 20px 40px;
  text-align: center;
  color: var(--muted);
  font-size: 0.92rem;
}

.footer-name {
  margin: 0 0 8px;
  font-weight: 700;
  color: var(--navy);
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  justify-content: center;
}

.site-footer a {
  color: var(--teal);
  text-decoration: none;
  font-weight: 600;
}

.site-footer a:hover { text-decoration: underline; }

.not-found {
  text-align: center;
  padding: 48px 20px 24px;
}

.not-found .code {
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 3.2rem;
  font-weight: 800;
  color: var(--navy);
  letter-spacing: -0.04em;
}

.btn {
  display: inline-block;
  background: var(--navy);
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  padding: 12px 22px;
  border-radius: 10px;
}

.btn:hover { color: #fff; background: #243356; }

@media (max-width: 640px) {
  article, .panel { padding: 22px 16px 28px; }
  h1 { font-size: 1.55rem; }
}