:root {
  color-scheme: light dark;
  --bg: #FAF9F7; --surface: #FFFFFF; --surface2: #F1EFEC; --border: #E7E3DD;
  --text: #16171C; --text-secondary: #6B6E78; --accent: #FF6B47; --on-accent: #FFFFFF;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12141B; --surface: #1B1E27; --surface2: #242833; --border: #2E3340;
    --text: #F5F4F2; --text-secondary: #9A9DA8; --accent: #FF7A54; --on-accent: #12141B;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #12141B; --surface: #1B1E27; --surface2: #242833; --border: #2E3340;
  --text: #F5F4F2; --text-secondary: #9A9DA8; --accent: #FF7A54; --on-accent: #12141B;
}
:root[data-theme="light"] {
  color-scheme: light;
  --bg: #FAF9F7; --surface: #FFFFFF; --surface2: #F1EFEC; --border: #E7E3DD;
  --text: #16171C; --text-secondary: #6B6E78; --accent: #FF6B47; --on-accent: #FFFFFF;
}
.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center; margin-left: 20px;
  width: 36px; height: 36px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text-secondary); cursor: pointer; flex-shrink: 0;
}
.theme-toggle svg { width: 16px; height: 16px; }
.theme-toggle .icon-moon { display: none; }
@media (prefers-color-scheme: dark) {
  .theme-toggle .icon-sun { display: none; }
  .theme-toggle .icon-moon { display: block; }
}
:root[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: block; }
:root[data-theme="light"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: none; }
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
}
a { color: inherit; }
.wrap { max-width: 720px; margin: 0 auto; padding-left: 20px; padding-right: 20px; }
header.site { display: flex; align-items: center; justify-content: space-between; padding: 22px 0; flex-wrap: wrap; gap: 12px; }
.brand { display: flex; align-items: center; gap: 8px; font-family: "Space Grotesk", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; font-weight: 700; letter-spacing: -0.02em; font-size: 20px; text-decoration: none; color: var(--text); }
.brand-mark { stroke: var(--accent); flex-shrink: 0; }
nav.site a { color: var(--text-secondary); text-decoration: none; margin-left: 20px; font-size: 14px; font-weight: 600; }
nav.site a:first-child { margin-left: 0; }
nav.site a.nav-login { color: var(--accent); }

main { padding: 20px 0 60px; }
h1.page-title { font-size: 32px; margin: 10px 0 8px; }
p.page-lead { color: var(--text-secondary); font-size: 16px; margin: 0 0 36px; }

.post-card {
  display: block; text-decoration: none; color: inherit;
  background: var(--surface); border: 1px solid var(--border); border-radius: 18px;
  padding: 22px; margin-bottom: 16px;
}
.post-card .date { color: var(--accent); font-size: 13px; font-weight: 700; margin-bottom: 6px; }
.post-card h2 { font-size: 19px; margin: 0 0 8px; }
.post-card p { color: var(--text-secondary); font-size: 14px; margin: 0; }

.post header.post-meta { margin-bottom: 8px; }
.post .date { color: var(--accent); font-size: 13px; font-weight: 700; }
.post h1 { font-size: 30px; margin: 6px 0 24px; }
.post p, .post li { color: var(--text); font-size: 16px; }
.post h2 { font-size: 20px; margin: 32px 0 12px; }
.post ul { padding-left: 20px; }
.back-link { display: inline-block; margin-top: 30px; font-size: 14px; font-weight: 600; color: var(--accent); text-decoration: none; }

footer.site { border-top: 1px solid var(--border); padding: 48px 0 28px; margin-top: 20px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px 20px; margin-bottom: 32px; }
.footer-brand p { color: var(--text-secondary); font-size: 13px; line-height: 1.6; margin: 12px 0 14px; max-width: 280px; }
.footer-contact { color: var(--text-secondary); font-size: 13px; text-decoration: none; }
.footer-contact:hover { color: var(--accent); }
.footer-col h4 { font-size: 13px; margin: 0 0 14px; color: var(--text); }
.footer-col a { display: block; color: var(--text-secondary); text-decoration: none; font-size: 13px; margin-bottom: 10px; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom { border-top: 1px solid var(--border); padding-top: 20px; }
.footer-bottom span { color: var(--text-secondary); font-size: 13px; }
@media (max-width: 640px) { .footer-grid { grid-template-columns: 1fr 1fr; } }