:root { color-scheme: dark; font-family: system-ui, sans-serif; background: #080b14; color: #e2e8f0; line-height: 1.7; }
* { box-sizing: border-box; }
body { margin: 0; }
a { color: #5eead4; text-underline-offset: .2em; }
a:hover { color: #ccfbf1; }
a:focus-visible { outline: 3px solid #fbbf24; outline-offset: 5px; border-radius: 3px; }
header, main, footer { width: min(100% - 40px, 1000px); margin: auto; }
header { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px; padding: 24px 0; border-bottom: 1px solid #334155; }
header nav { display: flex; flex-wrap: wrap; gap: 24px; }
.brand { color: #e2e8f0; font-weight: 800; letter-spacing: .1em; text-decoration: none; }
main { padding: 36px 0 60px; }
h1 { font-size: clamp(1.9rem, 4vw, 3rem); line-height: 1.2; max-width: 850px; }
h2 { line-height: 1.3; }
.intro { font-size: 1.15rem; max-width: 800px; color: #cbd5e1; }
.topics { display: flex; flex-wrap: wrap; gap: 12px 24px; margin: 28px 0; }
.start, .limits { padding: 20px 24px; background: #111827; border: 1px solid #334155; border-radius: 16px; }
.start h2, .limits h2 { margin-top: 0; }
.guide-section { margin-top: 44px; scroll-margin-top: 20px; }
.guide-section > p { color: #cbd5e1; }
.guide-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr)); list-style: none; gap: 12px; padding: 0; }
.guide-list li { display: flex; }
.guide-list a { display: block; width: 100%; padding: 18px; background: #111827; border: 1px solid #334155; border-radius: 12px; overflow-wrap: anywhere; }
.limits { margin-top: 40px; }
footer { padding: 24px 0 40px; border-top: 1px solid #334155; }
footer a { display: inline-block; margin-right: 20px; margin-bottom: 8px; }
@media (max-width: 480px) { header, main, footer { width: calc(100% - 32px); } .start, .limits { padding: 18px; } }