:root {
  --bg: #f5f6fa;
  --surface: #ffffff;
  --text: #1f2430;
  --muted: #5b6270;
  --primary: #3f51b5;
  --primary-dark: #303f9f;
  --border: #dfe2ea;
  --header-bg: #ffffff;
  --footer-bg: #1b1e27;
  --footer-text: #c9ccd6;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161d;
    --surface: #1e212b;
    --text: #e8eaf0;
    --muted: #a3a8b6;
    --primary: #8c9eff;
    --primary-dark: #7986cb;
    --border: #2d3140;
    --header-bg: #ffffff;
    --footer-bg: #0d0f14;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg);
}

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

a { color: var(--primary); }
a:hover { color: var(--primary-dark); }

.site-header { background: var(--header-bg); border-bottom: 4px solid #3f51b5; }
.header-row { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; padding-top: 10px; padding-bottom: 10px; }
.logo img { display: block; height: auto; max-width: 100%; }
nav { display: flex; flex-wrap: wrap; gap: 4px 18px; }
nav a { color: #1f2430; text-decoration: none; font-size: 0.82rem; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; padding: 6px 0; border-bottom: 2px solid transparent; }
nav a:hover, nav a[aria-current="page"] { color: #3f51b5; border-bottom-color: #3f51b5; }

main { padding-top: 34px; padding-bottom: 48px; }
h1 { margin: 0 0 4px; font-size: 2rem; font-weight: 600; }
.lead { margin: 0 0 28px; color: var(--muted); font-size: 1.1rem; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(440px, 100%), 1fr)); gap: 20px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 22px 24px; }
.card-primary { border-top: 4px solid var(--primary); }
.card h2 { margin: 0 0 10px; font-size: 1.25rem; font-weight: 600; }
.card p { margin: 0 0 12px; }
.card ul { margin: 0; padding-left: 20px; }
.card li { margin: 4px 0; }

.button { display: inline-block; background: #3f51b5; color: #fff; padding: 10px 18px; border-radius: 6px; text-decoration: none; font-weight: 600; }
.button:hover { background: #303f9f; color: #fff; }
.button-secondary { background: transparent; color: var(--primary); border: 2px solid var(--primary); padding: 8px 16px; }
.button-secondary:hover { background: var(--primary); color: #fff; }

.tv { display: block; max-width: 100%; height: auto; border-radius: 4px; }

.site-footer { background: var(--footer-bg); color: var(--footer-text); padding: 22px 0; font-size: 0.9rem; }
.site-footer p { margin: 4px 0; }
.site-footer a { color: #ffffff; }