:root {
    --petrol: #073f46;
    --petrol-dark: #032f35;
    --teal: #0c7778;
    --mint: #dff5f1;
    --ink: #163337;
    --muted: #617477;
    --line: #dbe6e5;
    --soft: #f5f8f8;
    --white: #fff;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--soft); font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; line-height: 1.68; }
a { color: var(--teal); }
a:hover { color: var(--petrol); }
.shell { width: min(1100px, calc(100% - 36px)); margin-inline: auto; }
.site-header { background: var(--white); border-bottom: 1px solid var(--line); }
.nav { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--petrol); text-decoration: none; font-weight: 900; letter-spacing: .08em; }
.brand img { width: 44px; height: 44px; object-fit: contain; }
.nav-links { display: flex; flex-wrap: wrap; gap: 18px; align-items: center; }
.nav-links a { color: var(--ink); text-decoration: none; font-weight: 700; }
.hero { padding: 64px 0 34px; background: linear-gradient(145deg, var(--petrol-dark), var(--petrol)); color: var(--white); }
.eyebrow { display: inline-flex; padding: 7px 12px; border-radius: 999px; background: rgba(255,255,255,.12); color: #dffcf7; font-size: .82rem; font-weight: 800; letter-spacing: .05em; text-transform: uppercase; }
h1 { max-width: 820px; margin: 18px 0 12px; font-size: clamp(2rem, 5vw, 3.6rem); line-height: 1.08; }
.hero p { max-width: 760px; color: rgba(255,255,255,.82); font-size: 1.08rem; }
.updated { font-size: .9rem; color: rgba(255,255,255,.7); }
.layout { display: grid; grid-template-columns: minmax(0, 1fr) 270px; gap: 28px; padding: 36px 0 60px; align-items: start; }
.content, .side { background: var(--white); border: 1px solid var(--line); border-radius: 18px; box-shadow: 0 12px 34px rgba(4,54,60,.07); }
.content { padding: clamp(24px, 5vw, 50px); }
.content h2 { margin: 38px 0 10px; color: var(--petrol); font-size: clamp(1.35rem, 3vw, 1.8rem); line-height: 1.25; }
.content h2:first-child { margin-top: 0; }
.content h3 { margin: 24px 0 7px; color: var(--ink); }
.content p, .content li { color: #40595d; }
.content ul { padding-inline-start: 22px; }
.note { margin: 24px 0; padding: 18px; border-inline-start: 4px solid var(--teal); border-radius: 10px; background: var(--mint); }
.side { position: sticky; top: 18px; padding: 22px; }
.side strong { display: block; margin-bottom: 12px; color: var(--petrol); }
.side a { display: block; padding: 8px 0; border-bottom: 1px solid var(--line); text-decoration: none; font-weight: 700; }
.site-footer { background: var(--petrol-dark); color: rgba(255,255,255,.76); padding: 34px 0; }
.footer-grid { display: flex; justify-content: space-between; gap: 28px; align-items: flex-start; }
.footer-grid strong { color: var(--white); }
.footer-links { display: flex; flex-wrap: wrap; gap: 12px 18px; justify-content: flex-end; }
.footer-links a { color: #dffcf7; }
@media (max-width: 820px) {
    .nav { align-items: flex-start; padding: 14px 0; }
    .nav-links { justify-content: flex-end; gap: 10px 14px; }
    .layout { grid-template-columns: 1fr; }
    .side { position: static; order: -1; }
    .footer-grid { flex-direction: column; }
    .footer-links { justify-content: flex-start; }
}
@media (max-width: 540px) {
    .shell { width: min(100% - 24px, 1100px); }
    .nav { display: block; }
    .nav-links { margin-top: 12px; justify-content: flex-start; }
    .hero { padding-top: 42px; }
    .content { padding: 22px; border-radius: 14px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }