:root {
  --bg: #FEFDFB;
  --bg-alt: #F6F5F0;
  --text: #1C1C1C;
  --text-mid: #555;
  --text-soft: #888;
  --accent: #4A50C7;
  --accent-hover: #6266E0;
  --border: #E8E6E0;
  --font: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --measure: 640px;
}
html[data-theme="dark"] {
  --bg: #141418;
  --bg-alt: #1C1C22;
  --text: #E0E0E8;
  --text-mid: #B0B0BF;
  --text-soft: #8A8AA0;
  --accent: #8388FF;
  --accent-hover: #A0A4FF;
  --border: #363645;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; }
.page { max-width: var(--measure); margin: 0 auto; padding: 0 1.5rem; }
header {
  padding: 2rem 1.5rem;
  max-width: var(--measure);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
header nav { display: flex; gap: 1.5rem; align-items: center; }
header nav a { color: var(--text-soft); font-size: 0.9rem; }
header nav a:hover { color: var(--text); text-decoration: none; }
.theme-toggle {
  background: none; border: none; padding: 0; cursor: pointer;
  color: var(--text-soft); font-size: 0.85rem; font-family: var(--font);
  line-height: 1; display: inline-flex; align-items: center; gap: 0.4rem;
}
.theme-toggle:hover { color: var(--accent); }
.theme-toggle-icon { font-size: 1rem; line-height: 1; }
.nav-toggle {
  display: none; background: none; border: none; cursor: pointer;
  color: var(--text); font-size: 1.4rem; line-height: 1; padding: 0.25rem;
}
@media (max-width: 600px) {
  .nav-toggle { display: block; }
  header nav { display: none; position: absolute; top: 100%; left: 0; right: 0; background: var(--bg); border-bottom: 1px solid var(--border); flex-direction: column; gap: 0; padding: 0.5rem 0; }
  header nav.open { display: flex; }
  header nav a { padding: 0.75rem 1.5rem; display: block; width: 100%; text-align: left; border: none; border-radius: 0; }
  header { position: relative; }
}
footer {
  padding: 3rem 0;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-soft);
  display: flex; justify-content: space-between; align-items: center;
}
footer a { color: var(--text-soft); }
footer a:hover { color: var(--accent); }
.footer-meta { display: flex; align-items: center; gap: 1.25rem; }
.footer-links { display: flex; align-items: center; gap: 1.1rem; }
.footer-links a { display: inline-flex; }
.footer-links svg { width: 19px; height: 19px; display: block; }
@media (max-width: 480px) {
  footer { flex-direction: column; gap: 0.75rem; }
}