:root {
  color-scheme: only light;
  --graphite: #0f1518;
  --black: #080b0d;
  --panel: #141b1f;
  --panel-2: #192126;
  --orange: #fd4500;
  --orange-hot: #ff6a2e;
  --white: #f5f7f8;
  --muted: #99a4aa;
  --line: rgba(255,255,255,.12);
  --line-strong: rgba(255,255,255,.22);
  --shell: min(1180px, calc(100vw - 48px));
  --display: "Arial Narrow", "Roboto Condensed", "Segoe UI", sans-serif;
  --body: "Segoe UI", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--black); }
body {
  margin: 0;
  color: var(--white);
  background: var(--black);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; }
a { color: inherit; }
button, input, textarea { font: inherit; }
.shell { width: var(--shell); margin-inline: auto; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; left: 1rem; top: -100px; z-index: 100; padding: .75rem 1rem; color: #111; background: var(--white); }
.skip-link:focus { top: 1rem; }

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 20;
  height: 92px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: 0 max(24px, calc((100vw - 1180px)/2));
  border-bottom: 1px solid transparent;
  transition: background .25s ease, border-color .25s ease, height .25s ease;
}
.site-header.scrolled { height: 74px; background: rgba(8,11,13,.92); border-color: var(--line); backdrop-filter: blur(16px); }
.brand { flex: 0 0 auto; width: clamp(200px, 18vw, 280px); }
.brand img { width: 100%; }
.site-nav { display: flex; flex: 0 0 auto; align-items: center; justify-content: flex-end; gap: 1rem; }
.site-nav a {
  color: #d3d9dc;
  font-family: var(--display);
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .15em;
  text-decoration: none;
  text-transform: uppercase;
  white-space: nowrap;
  transition: color .2s ease;
}
.site-nav a:hover, .site-nav a:focus-visible { color: var(--orange); }
.site-nav .nav-contact { padding: .7rem 1rem; border: 1px solid var(--line-strong); }
.nav-toggle { display: none; width: 44px; height: 44px; background: transparent; border: 1px solid var(--line); }
.nav-toggle > span:not(.sr-only) { display: block; width: 20px; height: 2px; margin: 4px auto; background: var(--white); transition: transform .2s ease, opacity .2s ease; }

.hero { position: relative; min-height: 100svh; display: flex; align-items: center; isolation: isolate; overflow: hidden; }
.hero-media, .hero-shade, .hero-grid { position: absolute; inset: 0; }
.hero-media { z-index: -4; background: url("assets/argus-hero-hex-v2.webp") 58% center / cover no-repeat; transform: scale(1.01); }
.hero-shade { z-index: -3; background: linear-gradient(90deg, rgba(8,11,13,.98) 0%, rgba(8,11,13,.86) 32%, rgba(8,11,13,.28) 63%, rgba(8,11,13,.48) 100%), linear-gradient(0deg, rgba(8,11,13,.88) 0%, transparent 40%); }
.hero-grid { z-index: -2; opacity: .16; background-image: linear-gradient(rgba(255,255,255,.09) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.09) 1px, transparent 1px); background-size: 72px 72px; mask-image: linear-gradient(90deg, black, transparent 72%); }
.hero::after { content: ""; position: absolute; inset: auto 0 0; height: 3px; background: linear-gradient(90deg, var(--orange) 0 18%, transparent 18%); }
.hero-content { padding-top: 8rem; padding-bottom: 7rem; }
.eyebrow { margin: 0 0 1.25rem; color: #c4cbd0; font-family: var(--display); font-size: .75rem; font-weight: 800; letter-spacing: .2em; text-transform: uppercase; }
.eyebrow span { display: inline-block; width: 35px; height: 2px; margin-right: .75rem; vertical-align: middle; background: var(--orange); }
.program-code { display: flex; align-items: baseline; gap: .65rem; margin-bottom: 1rem; font-family: var(--display); letter-spacing: .08em; }
.program-code span { font-size: .82rem; font-weight: 800; color: var(--muted); }
.program-code strong { color: var(--orange); font-size: 1.25rem; }
h1, h2, h3 { margin: 0; font-family: var(--display); font-weight: 900; text-transform: uppercase; }
h1 { max-width: 820px; font-size: clamp(3.5rem, 7vw, 7.6rem); line-height: .88; letter-spacing: -.055em; }
h1 em { color: var(--orange); font-style: normal; }
.hero-copy { max-width: 610px; margin: 2rem 0 0; color: #c4cbd0; font-size: clamp(1rem, 1.4vw, 1.2rem); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 2.4rem; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 52px; padding: .8rem 1.3rem; border: 1px solid transparent; font-family: var(--display); font-size: .78rem; font-weight: 900; letter-spacing: .13em; text-decoration: none; text-transform: uppercase; transition: transform .2s ease, background .2s ease, border-color .2s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { color: #100b08; background: var(--orange); }
.button-primary:hover { background: var(--orange-hot); }
.button-primary span { margin-left: 1rem; font-size: 1rem; }
.button-quiet { border-color: var(--line-strong); background: rgba(15,21,24,.4); }
.button-quiet:hover { border-color: var(--orange); }
.visualization-note { position: absolute; right: 24px; bottom: 22px; margin: 0; color: rgba(255,255,255,.44); font-size: .7rem; letter-spacing: .04em; }
.scroll-rail { position: absolute; left: max(24px, calc((100vw - 1180px)/2 - 42px)); bottom: 0; width: 1px; height: 110px; background: rgba(255,255,255,.15); }
.scroll-rail span { display: block; width: 1px; height: 34px; background: var(--orange); animation: scan 2.1s ease-in-out infinite; }

.status-band { background: var(--graphite); border-bottom: 1px solid var(--line); }
.status-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.status-grid > div { padding: 1.15rem 1.4rem; border-left: 1px solid var(--line); }
.status-grid > div:last-child { border-right: 1px solid var(--line); }
.status-grid span, .status-grid strong { display: block; }
.status-grid span { color: var(--muted); font-size: .65rem; font-weight: 700; letter-spacing: .16em; text-transform: uppercase; }
.status-grid strong { margin-top: .2rem; font-family: var(--display); font-size: .9rem; letter-spacing: .05em; text-transform: uppercase; }
.status-live { color: #f2f5f6; }
.status-live i { display: inline-block; width: 7px; height: 7px; margin-right: .5rem; border-radius: 50%; background: var(--orange); box-shadow: 0 0 0 3px rgba(253,69,0,.1), 0 0 5px rgba(253,69,0,.28); animation: status-pulse 2.6s ease-in-out infinite; transform-origin: center; }

.section { padding: clamp(6rem, 10vw, 10rem) 0; }
section[id] { scroll-margin-top: 74px; }
.split { display: grid; grid-template-columns: .86fr 1.14fr; gap: clamp(4rem, 9vw, 9rem); align-items: start; }
.section h2 { font-size: clamp(2.5rem, 4.6vw, 5rem); line-height: .98; letter-spacing: -.045em; }
.section-intro { position: sticky; top: 120px; }
.program { background: #f0f2f3; color: #111719; }
.program .eyebrow { color: #555f64; }
.program-copy .lead { margin-top: .25rem; color: #111719; font-size: clamp(1.35rem, 2.1vw, 2rem); line-height: 1.38; font-weight: 600; }
.program-copy > p:not(.lead) { max-width: 680px; color: #4d585e; }
.signature-line { display: flex; align-items: center; gap: 1.25rem; margin-top: 3rem; color: var(--orange); }
.signature-line span { width: 100%; height: 1px; background: rgba(15,21,24,.18); }
.signature-line b { font-family: var(--display); font-size: 1rem; }

.architecture { background: var(--black); }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 3rem; }
.section-heading > p { max-width: 410px; margin: 0 0 .4rem; color: var(--muted); }
.architecture-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; margin-top: 4.5rem; background: var(--line); border: 1px solid var(--line); }
.system-card { position: relative; min-height: 330px; padding: clamp(2rem, 4vw, 3.6rem); background: var(--graphite); overflow: hidden; }
.system-card::before { content: ""; position: absolute; right: -70px; bottom: -90px; width: 220px; height: 220px; border: 1px solid rgba(255,255,255,.06); transform: rotate(45deg); }
.card-index { color: var(--orange); font-family: var(--display); font-size: .78rem; font-weight: 900; letter-spacing: .15em; }
.system-card h3 { margin-top: 4.5rem; font-size: clamp(1.5rem, 2.5vw, 2.4rem); letter-spacing: -.025em; }
.system-card p { max-width: 480px; color: var(--muted); }
.card-rule { position: absolute; left: 0; bottom: 0; width: 0; height: 3px; background: var(--orange); transition: width .35s ease; }
.system-card:hover .card-rule { width: 100%; }

.principles { position: relative; background: var(--graphite); border-block: 1px solid var(--line); }
.principles .shell { display: grid; grid-template-columns: .8fr 1.2fr; gap: clamp(4rem, 10vw, 10rem); }
.principles-lockup { position: relative; }
.principles-lockup > img { width: 88px; margin-bottom: 3rem; }
.principles-lockup h2 { position: sticky; top: 160px; }
.principle-list { border-top: 1px solid var(--line); }
.principle { display: grid; grid-template-columns: 54px minmax(180px, 210px) minmax(0, 1fr); gap: 1rem; align-items: baseline; padding: 2.3rem 0; border-bottom: 1px solid var(--line); }
.principle-number { color: var(--orange); font-family: var(--display); font-size: .72rem; font-weight: 900; }
.principle h3 { font-size: 2.4rem; }
.principle p { min-width: 0; margin: 0; color: var(--muted); }

.development { background: #f0f2f3; color: #111719; }
.development .eyebrow { color: #555f64; }
.development-list { border-top: 2px solid #111719; }
.development-list > div { display: grid; grid-template-columns: 42px 1fr auto; gap: 1.2rem; align-items: center; padding: 1.6rem 0; border-bottom: 1px solid rgba(15,21,24,.18); }
.development-list span { color: var(--orange); font-family: var(--display); font-weight: 900; }
.development-list p { margin: 0; font-weight: 600; }
.development-list b { color: #5c676d; font-family: var(--display); font-size: .7rem; letter-spacing: .12em; text-transform: uppercase; }

.about { background: #0b1012; }
.about-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: clamp(4rem, 9vw, 9rem); align-items: start; }
.about-intro { position: sticky; top: 150px; }
.about-intro h2 { max-width: 610px; font-size: clamp(3rem, 5.4vw, 6rem); line-height: .94; }
.about-copy .lead { margin-top: 0; color: var(--white); font-size: clamp(1.3rem, 2.1vw, 1.85rem); line-height: 1.4; }
.about-copy > p:not(.lead) { color: var(--muted); }
.about-facts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); margin: 3rem 0 0; border-block: 1px solid var(--line); }
.about-facts > div { min-width: 0; padding: 1.35rem 1.2rem; border-right: 1px solid var(--line); }
.about-facts > div:first-child { padding-left: 0; }
.about-facts > div:last-child { border-right: 0; }
.about-facts dt { color: var(--orange); font-family: var(--display); font-size: .7rem; font-weight: 900; letter-spacing: .14em; text-transform: uppercase; }
.about-facts dd { margin: .35rem 0 0; color: var(--white); font-weight: 700; line-height: 1.35; }

.contact { position: relative; padding: clamp(6rem, 12vw, 11rem) 0; background: var(--orange); color: #140b07; overflow: hidden; }
.contact-grid { position: absolute; inset: 0; opacity: .15; background-image: linear-gradient(rgba(0,0,0,.25) 1px, transparent 1px), linear-gradient(90deg, rgba(0,0,0,.25) 1px, transparent 1px); background-size: 72px 72px; transform: perspective(500px) rotateX(64deg) scale(1.7); transform-origin: center bottom; }
.contact-inner { position: relative; max-width: 980px; margin-left: max(24px, calc((100vw - 1180px)/2)); }
.contact .eyebrow { color: #321207; }
.contact .eyebrow span { background: #140b07; }
.contact h2 { max-width: 960px; font-size: clamp(3rem, 6.5vw, 6.7rem); line-height: .92; }
.contact-inner > p:not(.eyebrow) { max-width: 720px; margin-top: 2rem; font-size: 1.08rem; }
.contact-note { display: inline-flex; max-width: 100%; flex-direction: column; margin-top: 2rem; padding: 1rem 1.2rem; border-left: 3px solid #140b07; background: rgba(255,255,255,.16); }
.contact-note span { font-size: .68rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
.contact-note a { color: inherit; font-family: var(--display); font-size: 1rem; text-transform: uppercase; text-decoration-color: rgba(20,11,7,.45); text-underline-offset: .25rem; overflow-wrap: anywhere; }
.contact-note a:hover, .contact-note a:focus-visible { text-decoration-color: currentColor; }

.site-footer { padding: 2.3rem 0; background: var(--black); border-top: 1px solid var(--line); }
.footer-inner { display: grid; grid-template-columns: 280px 1fr auto; align-items: center; gap: 2rem; }
.footer-inner p { margin: 0; color: var(--muted); font-size: .75rem; letter-spacing: .06em; }
.footer-inner p:last-child { text-align: right; }

.reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }
@keyframes scan { 0%,100% { transform: translateY(0); opacity: .25; } 50% { transform: translateY(76px); opacity: 1; } }
@keyframes scan-mobile { 0%,100% { transform: translateY(0); opacity: .3; } 50% { transform: translateY(52px); opacity: 1; } }
@keyframes status-pulse {
  0%, 100% { opacity: .58; box-shadow: 0 0 0 2px rgba(253,69,0,.06), 0 0 3px rgba(253,69,0,.2); }
  48% { opacity: 1; box-shadow: 0 0 0 5px rgba(253,69,0,.13), 0 0 11px rgba(253,69,0,.68); }
}

@media (max-width: 1400px) {
  .brand { width: 190px; }
  .site-nav { gap: .55rem; }
  .site-nav a { font-size: .68rem; letter-spacing: .1em; }
}

@media (max-width: 900px) {
  :root { --shell: min(100% - 32px, 720px); }
  .site-header { height: 76px; padding-inline: 16px; }
  .brand { width: 235px; }
  .nav-toggle { display: block; }
  .site-nav { position: fixed; inset: 76px 0 auto; display: grid; gap: 0; padding: 1rem 16px 1.5rem; background: rgba(8,11,13,.98); border-bottom: 1px solid var(--line); transform: translateY(-130%); transition: transform .25s ease; }
  .site-nav.open { transform: translateY(0); }
  .site-nav a { padding: 1rem; border-bottom: 1px solid var(--line); }
  .site-nav .nav-contact { margin-top: .75rem; text-align: center; border: 1px solid var(--orange); }
  .nav-toggle[aria-expanded="true"] > span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] > span:nth-child(2) { opacity: 0; }
  .nav-toggle[aria-expanded="true"] > span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
  .hero { min-height: 820px; }
  .hero-media { background-position: 64% center; opacity: .9; }
  .hero-shade { background: linear-gradient(90deg, rgba(8,11,13,.93) 0%, rgba(8,11,13,.7) 48%, rgba(8,11,13,.34) 100%), linear-gradient(0deg, rgba(8,11,13,.8) 0%, transparent 52%); }
  .hero-content { padding-top: 9rem; }
  .visualization-note { left: 16px; right: 16px; bottom: 16px; }
  .scroll-rail { display: block; left: 16px; height: 78px; }
  .scroll-rail span { height: 26px; animation-name: scan-mobile; }
  .status-live i { width: 8px; height: 8px; }
  .status-grid { grid-template-columns: repeat(2, 1fr); }
  .status-grid > div:nth-child(3) { border-top: 1px solid var(--line); }
  .status-grid > div:nth-child(4) { border-top: 1px solid var(--line); border-right: 1px solid var(--line); }
  .split, .principles .shell, .about-grid { grid-template-columns: 1fr; gap: 3rem; }
  .section-intro, .principles-lockup h2, .about-intro { position: static; }
  .section-heading { display: block; }
  .section-heading > p { margin-top: 1.5rem; }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-inner p:last-child { text-align: left; }
}

@media (max-width: 760px) {
  .principle { grid-template-columns: 36px minmax(0, 1fr); align-items: start; }
  .principle p { grid-column: 2; margin-top: -.25rem; }
}

@media (max-width: 600px) {
  h1 { font-size: clamp(3.2rem, 16vw, 5rem); }
  .hero-copy { max-width: 92%; }
  .hero-actions { display: grid; }
  .button { width: 100%; }
  .status-grid { grid-template-columns: 1fr; }
  .status-grid > div { border-right: 1px solid var(--line); border-top: 1px solid var(--line); }
  .status-grid > div:first-child { border-top: 0; }
  .architecture-grid { grid-template-columns: 1fr; }
  .system-card { min-height: 280px; }
  .about-facts { grid-template-columns: 1fr; }
  .about-facts > div { padding: 1rem 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .about-facts > div:last-child { border-bottom: 0; }
  .development-list > div { grid-template-columns: 32px 1fr; }
  .development-list b { grid-column: 2; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}