:root { --blue: #175E7C; --deep: #0E2A38; --gold: #E6B93F; --ink: #14303B; --muted: #5b6b73; --bg: #ffffff; --surface: #F4F6F8; }
* { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; color: var(--ink); background: var(--bg); line-height: 1.6; }
header { background: var(--deep); color: #fff; padding: 20px 16px; }
header .wrap { display: flex; align-items: center; gap: 14px; max-width: 800px; margin: 0 auto; }
header img { width: 44px; height: 44px; border-radius: 10px; }
header .brand { font-weight: 800; font-size: 1.15rem; letter-spacing: .2px; }
header .brand small { display: block; font-weight: 400; font-size: .8rem; color: #cfe0e8; }
nav { background: var(--blue); }
nav .wrap { max-width: 800px; margin: 0 auto; padding: 0 16px; display: flex; gap: 18px; flex-wrap: wrap; }
nav a { color: #fff; text-decoration: none; padding: 10px 0; font-size: .95rem; opacity: .9; }
nav a.active, nav a:hover { opacity: 1; border-bottom: 2px solid var(--gold); }
main { max-width: 800px; margin: 0 auto; padding: 28px 16px 48px; }
h1 { font-size: 1.7rem; margin: 0 0 6px; color: var(--deep); }
.updated { color: var(--muted); font-size: .9rem; margin-bottom: 24px; }
h2 { font-size: 1.15rem; margin: 26px 0 8px; color: var(--blue); }
p, li { font-size: 1rem; }
ul { padding-left: 20px; }
.card { background: var(--surface); border-radius: 12px; padding: 16px 18px; margin: 14px 0; }
.todo { background: #FFF4D6; border-left: 4px solid var(--gold); padding: 10px 14px; border-radius: 8px; font-size: .95rem; }
a { color: var(--blue); }
footer { border-top: 1px solid #e3e8eb; color: var(--muted); font-size: .85rem; padding: 18px 16px; text-align: center; }
.btn { display: inline-block; background: var(--blue); color: #fff; padding: 10px 16px; border-radius: 10px; text-decoration: none; font-weight: 600; margin: 6px 8px 6px 0; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #0E2A38; --ink: #F2F4F5; --muted: #a9bcc6; --surface: #143B4B; --blue: #8fc9e3; }
  footer { border-color: #24485a; }
  h1 { color: var(--ink); }
  header { background: #071b26; }
  .todo { background: #3a3117; color: #F2F4F5; }
}