:root { color-scheme: dark; }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: #0f1218; color: #e6e8ee; font: 16px/1.6 system-ui, -apple-system, Segoe UI, Roboto, sans-serif; }
header { border-bottom: 1px solid #2a2f3a; background: #161a22; }
header nav { max-width: 760px; margin: 0 auto; padding: 14px 20px; display: flex; gap: 22px; align-items: center; font-size: 14px; }
header nav a { color: #9aa3b2; text-decoration: none; }
header nav a:hover, header nav a.active { color: #e6e8ee; }
header nav .brand { font-weight: 600; color: #e6e8ee; letter-spacing: -0.01em; }
main { max-width: 760px; margin: 0 auto; padding: 36px 20px 64px; }
h1 { font-size: 28px; margin: 0 0 6px; letter-spacing: -0.01em; }
h2 { font-size: 18px; margin: 30px 0 8px; }
p, li { color: #cfd4dd; }
.meta { color: #9aa3b2; font-size: 14px; margin-bottom: 26px; }
a { color: #7fb4ff; }
code { font-size: 0.92em; background: #1c212b; padding: 1px 5px; border-radius: 4px; }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { text-align: left; padding: 8px 10px; border-top: 1px solid #2a2f3a; vertical-align: top; }
th { color: #9aa3b2; font-weight: 500; }
footer { max-width: 760px; margin: 0 auto; padding: 0 20px 40px; color: #6f7886; font-size: 13px; }
.card { width: min(420px, 92vw); margin: 10vh auto; padding: 28px; border: 1px solid #2a2f3a; border-radius: 12px; background: #161a22; }
.card h1 { font-size: 20px; }
.card p { font-size: 13px; color: #9aa3b2; margin: 0 0 18px; }
.firebaseui-container { background: transparent; box-shadow: none; }