* { box-sizing: border-box; }
body { margin: 0; color: #20314b; background: #f4f7fc; font-family: "Microsoft YaHei", Arial, sans-serif; }
a { color: #1957b8; }
a:focus-visible { outline: 3px solid #ffbf47; outline-offset: 3px; }
.about-nav { background: #285ae5; }
.about-nav-inner { max-width: 1200px; margin: auto; padding: 18px 24px; display: flex; justify-content: space-between; align-items: center; gap: 20px; }
.about-brand { color: #fff; font-size: 24px; font-weight: 700; text-decoration: none; }
.about-nav nav { display: flex; flex-wrap: wrap; justify-content: flex-end; align-items: center; gap: 12px; }
.about-nav nav a { color: #fff; font-size: clamp(14px, 1.2vw, 24px); font-weight: 700; text-decoration: none; white-space: nowrap; }
.about-nav nav a:hover, .about-nav nav a[aria-current="page"] { text-decoration: underline; }
.about-main { max-width: 1100px; margin: 34px auto 80px; padding: 40px; background: #fff; border-radius: 8px; box-shadow: 0 3px 18px rgba(34,69,126,.08); }
.about-kicker { color: #285ae5; font-weight: 700; margin: 0 0 12px; }
h1 { color: #174893; font-size: clamp(26px, 2.5vw, 32px); line-height: 1.35; margin: 0 0 18px; }
p { font-size: 17px; line-height: 1.8; }
.about-intro { margin: 0; font-size: 19px; text-indent: 2em; }
@media (max-width: 700px) { .about-nav-inner { display: block; } .about-nav nav { margin-top: 12px; } .about-main { margin: 16px; padding: 22px 16px; } }