:root {
  color-scheme: light;
  --page: #ffffff; --surface-alt: #f7f8fa; --text-primary: #0b0e14; --text-secondary: #57606f;
  --gridline: #e7e9ee; --accent: #2962ff; --accent-dark: #1a3fd6; --accent-soft: #e8edff;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--page); color: var(--text-primary); line-height: 1.6;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
a { color: var(--accent); }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header.nav { padding: 16px 0; border-bottom: 1px solid var(--gridline); }
header.nav .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; color: var(--text-primary); text-decoration: none; }
.brand img { width: 28px; height: 28px; border-radius: 50%; }
.nav-links { display: flex; align-items: center; gap: 20px; font-size: 14px; font-weight: 600; }
.nav-links a { color: var(--text-secondary); text-decoration: none; }
.nav-links a:hover { color: var(--accent); }
.nav-links .nav-cta { background: var(--accent); color: #fff; padding: 8px 16px; border-radius: 999px; font-weight: 700; }
.nav-links .nav-cta:hover { background: var(--accent-dark); color: #fff; }
.crumbs { font-size: 13px; color: var(--text-secondary); padding: 18px 0 0; }
.crumbs a { color: var(--text-secondary); }
h1 { font-size: 34px; line-height: 1.2; letter-spacing: -0.02em; margin: 10px 0 18px; }
h2 { font-size: 22px; margin: 36px 0 8px; letter-spacing: -0.01em; }
.fi { font-style: normal; font-weight: 600; }
.answer { background: var(--accent-soft); border: 1px solid #c9d6ff; border-radius: 14px; padding: 18px 20px; margin: 0 0 8px; }
.answer .big { font-size: 30px; font-weight: 800; color: var(--accent-dark); line-height: 1.2; }
.answer .say { font-size: 14px; color: var(--text-secondary); margin: 2px 0 10px; }
.answer p { margin: 0; font-size: 17px; }
.tablewrap { overflow-x: auto; margin: 12px 0; border: 1px solid var(--gridline); border-radius: 12px; }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--gridline); vertical-align: top; }
th { background: var(--surface-alt); font-size: 13px; color: var(--text-secondary); font-weight: 600; }
tr:last-child td { border-bottom: none; }
.examples { list-style: none; padding: 0; margin: 12px 0; display: grid; gap: 10px; }
.examples li { background: var(--surface-alt); border: 1px solid var(--gridline); border-radius: 12px; padding: 12px 16px; }
.examples .f { font-weight: 700; display: block; }
.examples .e { color: var(--text-secondary); font-size: 15px; }
details { border: 1px solid var(--gridline); border-radius: 12px; padding: 12px 16px; margin: 8px 0; }
summary { cursor: pointer; font-weight: 600; }
details p { margin: 8px 0 0; color: var(--text-secondary); }
.related { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; padding: 0; margin: 12px 0; }
.related a { display: inline-block; padding: 8px 14px; border: 1px solid var(--gridline); border-radius: 999px; text-decoration: none; font-size: 14px; color: var(--text-primary); }
.related a:hover { border-color: var(--accent); color: var(--accent); }
.cta { background: var(--surface-alt); border: 1px solid var(--gridline); border-radius: 16px; padding: 22px; margin: 40px 0 0; }
.cta h2 { margin-top: 0; font-size: 20px; }
.cta p { color: var(--text-secondary); margin: 6px 0 14px; }
.btn { display: inline-block; background: var(--accent); color: #fff; padding: 11px 22px; border-radius: 999px; font-weight: 700; text-decoration: none; }
.btn:hover { background: var(--accent-dark); }
.cat-list { list-style: none; padding: 0; margin: 8px 0 0; }
.cat-list li { padding: 10px 0; border-bottom: 1px solid var(--gridline); }
.cat-list a { font-weight: 600; text-decoration: none; }
.cat-list .w { color: var(--text-secondary); font-size: 14px; margin-left: 6px; }
footer { padding: 36px 0 48px; margin-top: 40px; border-top: 1px solid var(--gridline); font-size: 13px; color: var(--text-secondary); }
footer a { color: var(--text-secondary); margin-right: 16px; }
@media (max-width: 520px) { h1 { font-size: 27px; } .answer .big { font-size: 25px; } }