:root {
    color-scheme: light dark;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.65;
    background: #f6f7f9;
    color: #1d1d1f;
}

* { box-sizing: border-box; }

body { margin: 0; }

main {
    width: min(760px, calc(100% - 32px));
    margin: 32px auto;
    padding: clamp(24px, 5vw, 52px);
    background: #fff;
    border: 1px solid #e5e7eb;
    border-radius: 20px;
    box-shadow: 0 12px 40px rgb(15 23 42 / 8%);
}

h1 { margin: 0 0 8px; font-size: clamp(2rem, 7vw, 3rem); line-height: 1.1; }
h2 { margin: 36px 0 10px; font-size: 1.25rem; }
p, li { font-size: 1rem; }
ul { padding-left: 1.35rem; }
a { color: #0866d8; }
.meta { margin: 0; color: #667085; }
.summary {
    margin: 28px 0;
    padding: 18px 20px;
    border-left: 4px solid #198754;
    border-radius: 8px;
    background: #eef8f2;
}
footer { margin-top: 40px; padding-top: 20px; border-top: 1px solid #e5e7eb; color: #667085; }

@media (prefers-color-scheme: dark) {
    :root { background: #080b10; color: #f5f5f7; }
    main { background: #11151b; border-color: #28303b; box-shadow: none; }
    .meta, footer { color: #a8b0bd; }
    .summary { background: #10271a; }
    a { color: #64a8ff; }
}

@media (max-width: 520px) {
    main { width: 100%; min-height: 100vh; margin: 0; border: 0; border-radius: 0; }
}