html { color-scheme: dark; }
body { margin: 0 auto; padding: 24px; max-width: 900px; background: #101820; color: #e8edf2; font: 17px/1.7 system-ui, sans-serif; }
a { color: #78c9ff; text-underline-offset: .2em; overflow-wrap: anywhere; }
header { display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 12px; color: inherit; text-decoration: none; font-size: 22px; font-weight: 700; }
.brand small { display: block; font-size: 14px; color: #b5c4d1; font-weight: 400; }
nav { display: flex; flex-wrap: wrap; gap: 12px 24px; padding: 22px 0; border-bottom: 1px solid #354553; }
button { background: #192a38; color: #e8edf2; border: 1px solid #667d8f; border-radius: 6px; padding: 8px 12px; cursor: pointer; }
button[aria-pressed="true"] { background: #204d6c; border-color: #78c9ff; }
a:focus-visible, button:focus-visible { outline: 3px solid #ffc766; outline-offset: 4px; }
h1 { font-size: clamp(1.9rem, 5vw, 2.6rem); line-height: 1.2; }
h2 { font-size: 1.3rem; margin-top: 2rem; line-height: 1.4; }
main { padding: 10px 0 24px; }
footer { border-top: 1px solid #354553; padding: 20px 0; font-size: 14px; color: #b5c4d1; }