:root {
  --bg: #0b0b0f;
  --surface: #17171d;
  --text: #f5f5f7;
  --muted: #98989d;
  --accent: #ff3b62;
  --border: rgba(255,255,255,0.08);
  --radius: 16px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  font-size: 16px;
  min-height: 100vh;
  padding: 40px 20px 80px;
}

.container {
  max-width: 720px;
  margin: 0 auto;
}

header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 40px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border);
}

.mark-svg {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  filter: drop-shadow(0 10px 20px rgba(91, 91, 240, 0.35));
  line-height: 0;
}
.mark-svg svg { width: 100%; height: 100%; display: block; }

.brand {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.4px;
}

.brand-tag {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.2px;
}

.lang-nav {
  margin-left: auto;
  font-size: 13px;
  color: var(--muted);
}
.lang-nav a { color: var(--muted); text-decoration: none; padding: 0 6px; }
.lang-nav a:hover { color: var(--text); }
.lang-nav a.active { color: var(--accent); }

h1 {
  font-size: 34px;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 8px;
}

.updated {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 32px;
}

h2 {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.3px;
  margin: 36px 0 12px;
}

h3 {
  font-size: 16px;
  font-weight: 600;
  margin: 20px 0 8px;
  color: var(--text);
}

p, ul, ol { margin-bottom: 14px; color: var(--text); }
ul, ol { padding-left: 22px; }
li { margin-bottom: 6px; color: var(--text); }

a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
a:hover { opacity: 0.85; }

.muted { color: var(--muted); }

.callout {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin: 20px 0;
}
.callout strong { color: var(--text); }

footer {
  margin-top: 60px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #ffffff;
    --surface: #f5f5f7;
    --text: #1d1d1f;
    --muted: #6e6e73;
    --border: rgba(0,0,0,0.08);
  }
}