:root { color-scheme: light; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; color: #263a4f; background: #f4f8fc; }
* { box-sizing: border-box; }
body { margin: 0; min-width: 0; background: linear-gradient(145deg, #f7fbff, #f5fbf8); line-height: 1.8; }
.site-header, main, .site-footer { width: min(100% - 32px, 880px); margin-inline: auto; }
.site-header { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-top: 22px; }
.brand, .home-link { display: inline-flex; align-items: center; min-height: 44px; color: #1f4f7a; font-weight: 850; text-decoration: none; }
.brand { font-size: 1.05rem; }.home-link { font-size: .9rem; }
main { margin-top: 24px; padding: clamp(22px, 5vw, 48px); border: 1px solid #d5e1ec; border-radius: 22px; background: #fff; box-shadow: 0 12px 36px rgba(31, 67, 101, .1); }
.eyebrow { margin: 0; color: #347ca2; font-size: .78rem; font-weight: 900; letter-spacing: .09em; }
h1 { margin: 7px 0 0; color: #1f4f7a; font-size: clamp(1.8rem, 5vw, 2.7rem); line-height: 1.3; }
h2 { margin: 0; color: #26577f; font-size: clamp(1.12rem, 3vw, 1.35rem); line-height: 1.45; }
p { margin: 10px 0 0; }.lead { color: #486780; font-size: 1.02rem; font-weight: 650; }
section { margin-top: 22px; padding: 20px; border: 1px solid #d9e5ef; border-radius: 15px; background: #fbfdff; }
ul { margin: 10px 0 0; padding-left: 1.35em; }.topic-list li + li { margin-top: 5px; }
.play-panel { border-color: #b9d8e7; background: linear-gradient(145deg, #effaff, #f3fcf8); }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; margin-top: 16px; padding: 12px 20px; border-radius: 12px; background: #176f9a; color: #fff; font-weight: 850; text-decoration: none; }
.button:hover { background: #125f86; }.note { color: #5a7086; font-size: .9rem; }
.related-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin-top: 12px; }
.related-grid a { display: block; min-width: 0; padding: 13px; border: 1px solid #d9e5ef; border-radius: 12px; color: #1f5f8c; font-weight: 800; text-decoration: none; }
.related-grid a:hover { border-color: #6fa2c2; background: #f1f9ff; }.site-footer { padding: 22px 0 30px; color: #657b90; font-size: .86rem; text-align: center; }
.site-footer a { display: inline-flex; align-items: center; min-height: 44px; color: #1767ae; font-weight: 700; }
:focus-visible { outline: 3px solid #1769aa; outline-offset: 3px; }
@media (max-width: 560px) { .site-header, main, .site-footer { width: min(100% - 24px, 880px); }.site-header { padding-top: 16px; }.related-grid { grid-template-columns: 1fr; } main { margin-top: 16px; padding: 22px 18px; border-radius: 17px; } section { padding: 17px; } }