:root {
    --ink: #102a43;
    --muted: #5d7083;
    --accent: #146c78;
    --line: #dce5eb;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 110px; }
body { margin: 0; color: var(--ink); background: #fff; font-family: "PingFang SC", "Microsoft YaHei", sans-serif; font-size: 16px; line-height: 1.8; }
a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); }
a:focus-visible, button:focus-visible { outline: 3px solid #289ba9; outline-offset: 5px; }
button { font: inherit; cursor: pointer; }
h1, h2, h3, p, dl, dd { margin: 0; }
h1, h2, h3 { line-height: 1.4; }
.container { width: min(1160px, calc(100% - 64px)); margin-inline: auto; }
.skip-link { position: fixed; top: -100px; left: 20px; z-index: 20; padding: 10px 20px; background: #fff; }
.skip-link:focus { top: 10px; }
.site-header { position: sticky; top: 0; z-index: 10; background: rgba(255, 255, 255, .97); border-bottom: 1px solid var(--line); }
.header-inner { min-height: 92px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; align-items: center; gap: 13px; flex-shrink: 0; }
.brand-mark { display: grid; place-items: center; width: 46px; height: 46px; border-radius: 12px 12px 12px 2px; background: var(--ink); color: #fff; font-size: 25px; font-weight: 700; }
.brand-name { font-size: 19px; font-weight: 700; line-height: 1.6; }
.brand-caption { display: block; color: var(--muted); font-size: 11px; letter-spacing: 3px; font-weight: 400; }
.site-nav { display: flex; align-items: center; gap: 30px; }
.site-nav a { position: relative; padding-block: 12px; font-size: 14px; color: var(--muted); }
.site-nav a:hover, .site-nav a[aria-current] { color: var(--accent); }
.site-nav a[aria-current]::after { content: ""; position: absolute; bottom: 3px; left: 0; width: 22px; height: 2px; background: var(--accent); }
.menu-toggle { display: none; border: 1px solid var(--line); border-radius: 6px; padding: 4px 12px; color: var(--ink); background: #fff; }
.hero { position: relative; overflow: hidden; color: #fff; background: radial-gradient(ellipse at 90% 15%, #205568 0%, transparent 55%), linear-gradient(125deg, #102a43, #102637); }
.hero-grid { padding-block: 82px 72px; text-align: center; }
.eyebrow { font-size: 13px; letter-spacing: 3px; color: #a6d6dc; margin-bottom: 25px; }
h1 { font-size: clamp(36px, 4.2vw, 56px); letter-spacing: 2px; font-weight: 600; }
.hero-description { font-size: 21px; line-height: 1.8; color: #d6e3ee; margin-top: 23px; }
.hero-intro { margin-top: 16px; font-size: 14px; color: #b3c7d8; }
.button { display: inline-flex; align-items: center; justify-content: space-between; gap: 50px; padding: 12px 22px; border-radius: 5px; font-size: 14px; font-weight: 600; }
.button-primary { margin-top: 30px; background: #fff; color: var(--ink); }
.button-primary:hover { background: #dceff1; }
.hero-bottom { display: flex; justify-content: space-between; border-top: 1px solid rgba(214, 236, 245, .18); padding-block: 18px; color: #aec6d6; font-size: 12px; letter-spacing: 2px; }
.section { padding-block: 84px; }
.section-kicker { color: var(--accent); font-size: 13px; letter-spacing: 2px; margin-bottom: 10px; }
h2 { font-size: 30px; font-weight: 600; }
.title-line { margin-top: 24px; width: 42px; height: 3px; background: var(--accent); }
.about-grid { display: grid; grid-template-columns: 1fr 2fr; gap: 64px; }
.about-content > p { color: var(--muted); margin-bottom: 16px; }
.about-content .lead { color: var(--ink); font-size: 22px; font-weight: 600; margin-bottom: 18px; }
.principles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 25px; margin-top: 35px; padding-top: 28px; border-top: 1px solid var(--line); }
.principle-number { font-size: 12px; color: var(--accent); font-family: monospace; }
.principles h3 { font-size: 17px; font-weight: 500; margin-block: 7px; }
.principles p { font-size: 13px; color: var(--muted); }
.site-footer { background: #102637; color: #c2d0dc; padding-block: 32px 25px; }
.footer-top { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding-bottom: 24px; }
.footer-top p { color: #fff; font-size: 17px; }
.footer-top a { font-size: 12px; }
.footer-information { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 40px; font-size: 13px; }
.footer-information > div { display: flex; align-items: baseline; gap: 18px; }
.footer-information dt { flex-shrink: 0; color: #a6bccd; }
.footer-information dd { overflow-wrap: anywhere; }
.footer-note { padding-block: 20px; color: #a6bccd; font-size: 12px; }
.footer-bottom { display: flex; justify-content: space-between; gap: 20px; border-top: 1px solid #324859; padding-top: 20px; font-size: 12px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 10px 24px; }
.site-footer a:hover { color: #fff; text-decoration: underline; }

@media (max-width: 1000px) {
    .site-nav { gap: 20px; }
    .brand-name { font-size: 17px; }
    .about-grid { gap: 35px; }
    .footer-bottom { flex-direction: column; gap: 8px; }
}

@media (max-width: 760px) {
    html { scroll-padding-top: 150px; }
    .container { width: calc(100% - 40px); }
    .header-inner { min-height: 78px; flex-wrap: wrap; gap: 0 12px; padding-block: 14px; }
    .brand { gap: 9px; }
    .brand-mark { width: 36px; height: 36px; font-size: 22px; border-radius: 9px 9px 9px 2px; }
    .brand-name { font-size: 15px; }
    .brand-caption { font-size: 10px; letter-spacing: 2px; }
    .menu-toggle:not([hidden]) { display: block; font-size: 12px; padding: 4px 9px; }
    .site-nav { width: 100%; justify-content: space-between; gap: 10px; padding-top: 12px; }
    .site-nav a { font-size: 13px; }
    .site-nav.is-collapsible:not(.is-open) { display: none; }
    .hero-grid { padding-block: 48px 35px; }
    h1 { font-size: 38px; }
    .hero-description { font-size: 18px; }
    .hero-bottom { letter-spacing: 0; font-size: 11px; gap: 10px; }
    .section { padding-block: 52px; }
    h2 { font-size: 25px; }
    .about-grid { grid-template-columns: 1fr; gap: 30px; }
    .about-content .lead { font-size: 19px; }
    .about-content > p { font-size: 14px; }
    .principles { gap: 18px; }
    .footer-information { grid-template-columns: 1fr; }
    .footer-top p { font-size: 14px; }
    .footer-top a { white-space: nowrap; }
}

@media (max-width: 360px) {
    .container { width: calc(100% - 28px); }
    .brand-mark { display: none; }
    h1 { font-size: 32px; }
    .principles { grid-template-columns: 1fr; gap: 20px; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
}