:root {
 --oa-flag-red: #e2011a;
 --oa-open-red: #e2011a;
 --oa-white: #ffffff;
 --oa-flag-blue: #0145b5;
 --oa-asu-blue: #0145b5;
 --oa-black: #000000;
 --oa-charcoal: #0a0e14;
 --oa-bg: var(--oa-charcoal);
 --oa-text: var(--oa-white);
 --oa-muted: #a8b3c7;
 --oa-card: #121821;
 --oa-header-height: 64px;
 --oa-nav-mark-height: 48px;
 --oa-line: #243044;
 --oa-link: #6b9eff;
 --oa-review: #f0d9a0;
 --oa-review-bg: #3a2e1a;
 --oa-review-border: #8a6a2a;
 color-scheme: dark;
 font-family: ui-sans-serif, system-ui, -apple-system, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
 margin: 0;
 color: var(--oa-text);
 line-height: 1.55;
 background-color: var(--oa-bg);
 background-image:
 radial-gradient(ellipse 90% 55% at 12% -8%, rgba(1, 69, 181, 0.22), transparent 58%),
 radial-gradient(ellipse 70% 45% at 95% 5%, rgba(226, 1, 26, 0.12), transparent 52%),
 radial-gradient(ellipse 80% 50% at 50% 110%, rgba(1, 69, 181, 0.14), transparent 55%),
 linear-gradient(180deg, rgba(255,255,255,0.02), transparent 40%),
 url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.055'/%3E%3C/svg%3E");
 background-attachment: fixed;
 background-size: auto, auto, auto, auto, 180px 180px;
}
.skip-link {
 position: absolute;
 left: -9999px;
 top: 0;
 z-index: 100;
 background: var(--oa-flag-red);
 color: var(--oa-white);
 padding: 0.5rem 1rem;
 text-decoration: none;
 border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }
.site-header {
 position: sticky;
 top: 0;
 z-index: 40;
 background: rgba(10, 14, 20, 0.88);
 backdrop-filter: blur(12px);
 border-bottom: 1px solid var(--oa-line);
 min-height: var(--oa-header-height);
}
.site-header .inner {
 max-width: 48rem;
 margin: 0 auto;
 padding: 0.55rem 1.25rem;
 display: flex;
 flex-wrap: nowrap;
 align-items: center;
 gap: 0.75rem 1rem;
 min-height: var(--oa-header-height);
}
.brand {
 display: inline-flex;
 align-items: center;
 text-decoration: none;
 flex: 0 0 auto;
}
.brand img {
 height: var(--oa-nav-mark-height);
 width: auto;
 display: block;
}
.nav-toggle { position: absolute; opacity: 0; pointer-events: none; width: 0; height: 0; }
.nav-burger {
 display: none;
 margin-left: auto;
 width: 2.5rem;
 height: 2.5rem;
 border-radius: 0.5rem;
 border: 1px solid var(--oa-line);
 background: rgba(18, 24, 33, 0.8);
 color: var(--oa-white);
 align-items: center;
 justify-content: center;
 cursor: pointer;
 flex: 0 0 auto;
}
.nav-burger span {
 display: block;
 width: 1.1rem;
 height: 2px;
 background: currentColor;
 position: relative;
}
.nav-burger span::before,
.nav-burger span::after {
 content: "";
 position: absolute;
 left: 0;
 width: 100%;
 height: 2px;
 background: currentColor;
}
.nav-burger span::before { top: -6px; }
.nav-burger span::after { top: 6px; }
.nav {
 display: flex;
 flex-wrap: nowrap;
 align-items: center;
 gap: 0.35rem 0.9rem;
 font-size: 0.9rem;
 margin-left: auto;
}
.nav a {
 color: var(--oa-muted);
 text-decoration: none;
 white-space: nowrap;
 padding: 0.2rem 0;
}
.nav a:hover,
.nav a[aria-current="page"] { color: var(--oa-white); }
.nav a[aria-current="page"] {
 border-bottom: 2px solid var(--oa-flag-blue);
 padding-bottom: 2px;
}
.nav .cta-nav {
 display: inline-block;
 padding: 0.4rem 0.85rem;
 border-radius: 999px;
 background: var(--oa-flag-red);
 color: var(--oa-white) !important;
 font-weight: 600;
 text-decoration: none;
 border-bottom: none !important;
}
.nav .cta-nav:hover { filter: brightness(1.08); color: var(--oa-white) !important; }
.visually-hidden {
 position: absolute !important;
 width: 1px; height: 1px;
 padding: 0; margin: -1px;
 overflow: hidden; clip: rect(0,0,0,0);
 white-space: nowrap; border: 0;
}
.wrap {
 max-width: 48rem;
 margin: 0 auto;
 padding: 1.5rem 1.25rem 3rem;
}
h1 {
 font-size: clamp(1.75rem, 4vw, 2.15rem);
 letter-spacing: -0.03em;
 margin: 0 0 0.55rem;
 line-height: 1.2;
}
h2 {
 font-size: 1.25rem;
 margin: 0 0 0.5rem;
 letter-spacing: -0.02em;
}
h2.section {
 font-size: 1.35rem;
 margin: 2rem 0 0.85rem;
 letter-spacing: -0.02em;
}
h3 {
 margin: 0 0 0.35rem;
 font-size: 1.05rem;
 color: var(--oa-text);
}
.lede {
 color: var(--oa-muted);
 margin: 0 0 1.1rem;
 font-size: 1.05rem;
}
.lead-line {
 font-size: 1.15rem;
 font-weight: 600;
 color: var(--oa-text);
 margin: 0 0 0.85rem;
}
.card {
 border: 1px solid var(--oa-line);
 background: var(--oa-card);
 border-radius: 14px;
 padding: 1.2rem 1.3rem;
 margin: 0 0 1rem;
}
.card p { margin: 0.45rem 0 0; color: var(--oa-muted); }
.card p:first-of-type { margin-top: 0.35rem; }
.card > p:first-child { margin-top: 0; }
.card ul, .card ol { margin: 0.55rem 0 0; padding-left: 1.15rem; color: var(--oa-muted); }
.card li { margin: 0.3rem 0; }
.prose p { margin: 0 0 0.85rem; color: var(--oa-muted); }
.prose p:last-child { margin-bottom: 0; }
.cta-row {
 display: flex;
 flex-wrap: wrap;
 gap: 0.6rem;
 margin-top: 0.95rem;
}
.cta {
 display: inline-block;
 padding: 0.65rem 1.05rem;
 border-radius: 999px;
 background: var(--oa-flag-red);
 color: var(--oa-white);
 font-weight: 600;
 text-decoration: none;
}
.cta:hover { filter: brightness(1.08); }
.cta.ghost {
 background: transparent;
 color: #8eb4ff;
 border: 1px solid var(--oa-flag-blue);
}
.cta.ghost:hover { color: var(--oa-white); border-color: #6b9eff; }
.page-toc {
 display: flex;
 flex-wrap: wrap;
 gap: 0.4rem 0.75rem;
 margin: 0 0 1.25rem;
 font-size: 0.92rem;
}
.page-toc a { color: var(--oa-link); text-decoration: none; }
.page-toc a:hover { color: var(--oa-white); text-decoration: underline; }
.checked-note {
 font-size: 0.85rem;
 color: var(--oa-muted);
 font-style: italic;
 margin: 0 0 1.25rem;
}
.meta { font-size: 0.95rem; color: var(--oa-muted); margin: 0.35rem 0; }
.meta strong { color: #c5d4f0; font-weight: 600; }
a.in { color: var(--oa-link); }
a.in:hover { color: var(--oa-white); }
.hero {
 width: 100%;
 border-radius: 16px;
 overflow: hidden;
 border: 1px solid var(--oa-line);
 margin: 0 0 1.25rem;
 background: #152019;
}
.hero img {
 display: block;
 width: 100%;
 height: auto;
}
.hero-stripe {
 height: 4px;
 margin: 0 0 1.25rem;
 border-radius: 2px;
 background: linear-gradient(90deg, var(--oa-flag-red) 0 33.33%, var(--oa-white) 33.33% 66.66%, var(--oa-flag-blue) 66.66% 100%);
}
.activity-grid {
 display: grid;
 grid-template-columns: 1fr 1fr;
 gap: 0.85rem;
 margin: 0 0 1.5rem;
}
@media (max-width: 640px) {
 .activity-grid { grid-template-columns: 1fr; }
 .nav-burger { display: inline-flex; }
 .nav {
 display: none;
 position: absolute;
 top: 100%;
 left: 0; right: 0;
 margin: 0;
 padding: 0.75rem 1.25rem 1rem;
 flex-direction: column;
 align-items: stretch;
 gap: 0.15rem;
 background: rgba(10, 14, 20, 0.97);
 border-bottom: 1px solid var(--oa-line);
 box-shadow: 0 12px 24px rgba(0,0,0,0.35);
 }
 .nav a {
 padding: 0.65rem 0.25rem;
 border-bottom: 1px solid var(--oa-line);
 }
 .nav a[aria-current="page"] { border-bottom-color: var(--oa-flag-blue); }
 .nav .cta-nav {
 margin-top: 0.5rem;
 text-align: center;
 border-bottom: none !important;
 }
 .nav-toggle:checked ~ .nav { display: flex; }
 .site-header .inner { position: relative; }
}
.review-badge {
 display: inline-flex;
 align-items: center;
 gap: 0.35rem;
 font-size: 0.7rem;
 text-transform: uppercase;
 letter-spacing: 0.04em;
 color: var(--oa-review);
 border: 1px solid var(--oa-review-border);
 background: var(--oa-review-bg);
 border-radius: 999px;
 padding: 0.2rem 0.55rem;
 margin: 0 0.25rem 0.15rem 0;
 font-weight: 700;
 font-style: normal;
}
.review-field {
 display: inline-block;
 font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
 font-size: 0.92em;
 color: var(--oa-review);
 background: var(--oa-review-bg);
 border: 1px dashed var(--oa-review-border);
 border-radius: 6px;
 padding: 0.1rem 0.4rem;
 font-weight: 700;
}
.faq details {
 border: 1px solid var(--oa-line);
 background: var(--oa-card);
 border-radius: 12px;
 padding: 0.85rem 1.05rem;
 margin: 0 0 0.65rem;
}
.faq summary {
 cursor: pointer;
 font-weight: 600;
 color: var(--oa-text);
}
.faq details p {
 margin: 0.55rem 0 0;
 color: var(--oa-muted);
}
.rule-list { margin: 0; padding: 0; list-style: none; }
.rule-list li {
 border: 1px solid var(--oa-line);
 background: var(--oa-card);
 border-radius: 12px;
 padding: 0.95rem 1.1rem;
 margin: 0 0 0.65rem;
 color: var(--oa-muted);
}
.rule-list li strong { color: var(--oa-text); display: block; margin-bottom: 0.25rem; }
.site-footer {
 margin-top: 2.5rem;
 padding-top: 1.5rem;
 border-top: 1px solid var(--oa-line);
 color: var(--oa-muted);
 font-size: 0.9rem;
}
.site-footer .foot-brand {
 color: var(--oa-text);
 font-weight: 700;
 font-size: 1rem;
 margin: 0 0 0.25rem;
}
.site-footer .foot-tag { margin: 0 0 0.15rem; }
.site-footer .foot-loc { margin: 0 0 1rem; }
.site-footer .foot-nav,
.site-footer .foot-sub {
 display: flex;
 flex-wrap: wrap;
 gap: 0.35rem 0.85rem;
 margin: 0 0 0.75rem;
}
.site-footer a {
 color: var(--oa-link);
 text-decoration: none;
}
.site-footer a:hover { text-decoration: underline; color: var(--oa-white); }
.quote-example {
 border-left: 3px solid var(--oa-flag-blue);
 padding: 0.15rem 0 0.15rem 0.85rem;
 margin: 0.65rem 0;
 color: #c5d4f0;
 font-style: italic;
}
.dl-meta { margin: 0.75rem 0; }
.dl-meta dt {
 font-size: 0.8rem;
 text-transform: uppercase;
 letter-spacing: 0.04em;
 color: #8a97ad;
 margin-top: 0.55rem;
}
.dl-meta dd { margin: 0.15rem 0 0; color: var(--oa-muted); }
.steps { margin: 0.55rem 0 0; padding-left: 1.2rem; color: var(--oa-muted); }
.steps li { margin: 0.35rem 0; }