:root {
    color-scheme: light;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: #172033;
    background: #f5f7fb;
}

* { box-sizing: border-box; }

body { margin: 0; line-height: 1.65; }

header {
    background: #172033;
    color: #fff;
    padding: 48px 24px 40px;
}

.header-inner, main, footer {
    width: min(920px, calc(100% - 40px));
    margin: 0 auto;
}

.product { color: #75e6c1; font-weight: 700; }
h1 { margin: 8px 0; font-size: clamp(2rem, 6vw, 3.25rem); line-height: 1.1; }
.date { margin: 0; color: #c7cfdd; }

nav { margin-top: 24px; display: flex; gap: 18px; flex-wrap: wrap; }
nav a { color: #fff; font-weight: 650; }

main { background: #fff; padding: 40px 48px 56px; }
h2 { margin-top: 38px; color: #0d6759; font-size: 1.35rem; }
h3 { margin-top: 28px; font-size: 1.08rem; }
a { color: #075f9b; }
li { margin: 7px 0; }

.notice {
    border-left: 4px solid #0d8a74;
    background: #eefaf7;
    padding: 14px 18px;
    margin: 22px 0;
}

.warning { border-left-color: #b44242; background: #fff3f3; }
footer { padding: 28px 0 48px; color: #5b6474; font-size: .92rem; }

@media (max-width: 640px) {
    header { padding-top: 36px; }
    main { width: 100%; padding: 30px 20px 44px; }
    footer { width: calc(100% - 40px); }
}