:root { --brand: #3a5bd9; --bg: #f5f6fa; --card: #fff; --text: #141826; --muted: #5d6478; --line: #e4e7f0; }
@media (prefers-color-scheme: dark) { :root { --brand: #b3c5ff; --bg: #101218; --card: #171a22; --text: #e8eaf2; --muted: #9aa1b5; --line: #262a36; } }
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text); }
body { font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 40px; max-width: 520px; text-align: center; }
.logo { width: 72px; height: 72px; }
h1 { margin: 12px 0 8px; font-size: 32px; }
h2 { font-size: 18px; margin: 28px 0 4px; }
.lead { color: var(--muted); }
.small { font-size: 13px; color: var(--muted); }
.button { display: inline-block; margin: 12px 0; padding: 12px 22px; border-radius: 12px; background: var(--brand); color: #fff; text-decoration: none; font-weight: 600; }
@media (prefers-color-scheme: dark) { .button { color: #00154d; } }