:root {
  --bg: #f7f5fb;
  --card: #ffffff;
  --text: #17142a;
  --muted: #5d5a70;
  --line: #e7e4ef;
  --accent: #5b3fd0;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d0b16;
    --card: #1a1727;
    --text: #ece9f6;
    --muted: #a4a0b8;
    --line: #2a2640;
    --accent: #a993ff;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 36px 16px 56px;
}

header {
  display: flex;
  align-items: center;
  gap: 16px;
}
header a { line-height: 0; flex-shrink: 0; }
header img { width: 64px; height: 64px; border-radius: 15px; box-shadow: 0 8px 20px -8px rgba(60, 40, 140, 0.5); }
header h1 { margin: 0; font-size: 1.6rem; line-height: 1.2; letter-spacing: -0.02em; }
header p { margin: 3px 0 0; color: var(--muted); font-size: 0.95rem; }

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 26px 0 30px;
}
nav a {
  padding: 7px 14px;
  border-radius: 99px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
}
nav a:hover { color: var(--text); }
nav a[aria-current="page"] { background: var(--text); border-color: var(--text); color: var(--bg); }

a { color: var(--accent); }
a:focus-visible, summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

h2 {
  margin: 40px 0 10px;
  font-size: 0.8rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--muted);
}

h3 { margin: 22px 0 6px; font-size: 1.05rem; }

p { margin: 0 0 12px; }
ul { margin: 0 0 12px; padding-left: 22px; }
li { margin: 4px 0; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 20px 22px;
}
.card p:last-child { margin-bottom: 0; }

.muted { color: var(--muted); }
.tag {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 6px;
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
  vertical-align: 0.1em;
}

details {
  margin: 10px 0;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
}
summary {
  padding: 15px 20px;
  font-weight: 650;
  cursor: pointer;
}
details > *:not(summary) { margin-left: 20px; margin-right: 20px; }
details > :last-child { margin-bottom: 18px; }

footer {
  margin-top: 52px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.85rem;
}
footer a { color: var(--muted); }