/* aerosys.co — Aerospace Intelligence Technologies (AIT)
   © 2026 Deya Motawie. All rights reserved. */

/* Layout concept: an aeronautical chart sheet — graticule hero with an orange track,
   chart-annotation labels in mono, each product set on its own plate. */
:root {
  --paper: #F3F4F1;
  --sheet: #FFFFFF;
  --ink: #102E39;
  --ink-2: #566870;
  --rule: #D8DEDA;
  --grat: #E3E8E4;
  --accent: #C4442A;
  --accent-ink: #FFFFFF;
  --ifr: #1E5B98;
  --fir: #B7C4C4;
  --fir-fill: rgba(30, 91, 152, .035);
  --chip-a-bg: #E2EDF5; --chip-a-fg: #18507F;
  --chip-d-bg: #FBEAE5; --chip-d-fg: #973317;
  --cta-bg: #0A202A; --cta-fg: #E6EFEB; --cta-fg-2: #9FB2B4;
  --focus: #1E5B98;

  --f-display: "Archivo", "Arial Narrow", "Helvetica Neue", Arial, sans-serif;
  --f-body: "IBM Plex Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
  --f-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --tr: .1em;
  --wdth: 112;

  --s-1: .8125rem; --s0: 1rem; --s1: 1.1875rem; --s2: 1.5rem; --s3: 2rem;
  --s4: clamp(2.25rem, 4.6vw, 3.75rem);
  --measure: 64ch;
  --gutter-l: max(16px, env(safe-area-inset-left, 0px));
  --gutter-r: max(16px, env(safe-area-inset-right, 0px));
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #08171D; --sheet: #0E2028; --ink: #E6EFEB; --ink-2: #9DB0B3; --rule: #1F3640;
    --grat: #11262E; --accent: #EF7A5C; --accent-ink: #1C0904; --ifr: #7FB2D9;
    --fir: #2A4550; --fir-fill: rgba(127, 178, 217, .045);
    --chip-a-bg: #12293A; --chip-a-fg: #9CC6EA; --chip-d-bg: #3A1B12; --chip-d-fg: #F6A88F;
    --cta-bg: #0E2A35; --cta-fg: #E6EFEB; --cta-fg-2: #9DB0B3; --focus: #7FB2D9;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #08171D; --sheet: #0E2028; --ink: #E6EFEB; --ink-2: #9DB0B3; --rule: #1F3640;
  --grat: #11262E; --accent: #EF7A5C; --accent-ink: #1C0904; --ifr: #7FB2D9;
  --fir: #2A4550; --fir-fill: rgba(127, 178, 217, .045);
  --chip-a-bg: #12293A; --chip-a-fg: #9CC6EA; --chip-d-bg: #3A1B12; --chip-d-fg: #F6A88F;
  --cta-bg: #0E2A35; --cta-fg: #E6EFEB; --cta-fg-2: #9DB0B3; --focus: #7FB2D9;
  color-scheme: dark;
}
[dir="rtl"] {
  --f-display: "Noto Kufi Arabic", "Archivo", Tahoma, sans-serif;
  --f-body: "IBM Plex Sans Arabic", "IBM Plex Sans", Tahoma, "Segoe UI", sans-serif;
  --tr: 0;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: var(--f-body); font-size: var(--s0); line-height: 1.6;
  text-rendering: optimizeLegibility;
}
body::before {
  content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px);
  z-index: 10; background: var(--paper);
}
.site { font-family: var(--f-body); }
[dir="rtl"] .site, .site[dir="rtl"] { line-height: 1.75; }
img, svg { max-width: 100%; }
svg { direction: ltr; }
a { color: inherit; }
p { margin: 0; }
h1, h2, h3 { margin: 0; text-wrap: balance; font-family: var(--f-display); }
.mono { font-family: var(--f-mono); }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 3px; border-radius: 2px; }

.wrap {
  max-width: 1200px; margin-inline: auto;
  padding-left: var(--gutter-l); padding-right: var(--gutter-r);
}
@media (min-width: 720px) {
  .wrap { padding-left: max(32px, env(safe-area-inset-left, 0px)); padding-right: max(32px, env(safe-area-inset-right, 0px)); }
}

.skip {
  position: absolute; inset-inline-start: 16px; top: -60px; z-index: 30;
  background: var(--ink); color: var(--paper); padding: .5rem .9rem; border-radius: 2px;
}
.skip:focus { top: calc(8px + env(safe-area-inset-top, 0px)); }

/* ---------------------------------------------------------------- header */
.site-header {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 20;
  background: var(--paper); border-bottom: 1px solid var(--rule);
}
.bar { display: flex; align-items: center; gap: 24px; min-height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
.brand { gap: 11px; flex: none; }
.mark { width: 36px; height: 36px; flex: none; color: var(--ink); }
.brand-text { display: flex; flex-direction: column; line-height: 1; }
.brand-word { font-family: "Manrope", "Archivo", sans-serif; font-weight: 800; font-size: 24px; letter-spacing: -1px; }
.brand-tag {
  font-family: var(--f-body); font-size: 7.5px; letter-spacing: 2px; text-transform: uppercase;
  margin-top: 6px; color: var(--ink-2); font-weight: 500;
}
.nav { margin-inline-start: auto; }
.nav-list { list-style: none; display: flex; gap: 4px; margin: 0; padding: 0; }
.nav-list a {
  display: block; padding: .45rem .7rem; text-decoration: none; color: var(--ink-2);
  font-size: .95rem; border-radius: 2px;
}
.nav-list a:hover { color: var(--ink); background: var(--grat); }
.nav-list a[aria-current="page"] { color: var(--ink); box-shadow: inset 0 -2px 0 var(--accent); }
.tools { display: flex; align-items: center; gap: 8px; }
.lang {
  font-size: .9rem; text-decoration: none; padding: .4rem .7rem; border: 1px solid var(--rule);
  border-radius: 2px; color: var(--ink);
}
.lang:hover { border-color: var(--ink-2); }
.lang[lang="ar"] { font-family: "IBM Plex Sans Arabic", Tahoma, sans-serif; }
.theme-btn, .menu-btn {
  font: inherit; color: var(--ink); background: transparent; border: 1px solid var(--rule);
  border-radius: 2px; cursor: pointer; display: inline-flex; align-items: center; gap: 8px;
}
.theme-btn { width: 38px; height: 36px; justify-content: center; }
.theme-ico {
  width: 16px; height: 16px; border-radius: 50%; border: 1.5px solid var(--ink);
  background: linear-gradient(90deg, var(--ink) 50%, transparent 50%);
}
.theme-btn:hover, .menu-btn:hover { border-color: var(--ink-2); }
.menu-btn { display: none; padding: .4rem .7rem; font-size: .9rem; }
.menu-ico { width: 16px; height: 2px; background: var(--ink); box-shadow: 0 -5px 0 var(--ink), 0 5px 0 var(--ink); }

@media (max-width: 1079px) {
  /* one row: brand | tools | menu button; the menu list opens as a second row */
  .bar { display: grid; grid-template-columns: auto minmax(0, 1fr) auto auto; gap: 0 8px; padding-block: 10px; }
  .nav { display: contents; }
  .brand { grid-column: 1; grid-row: 1; }
  .tools { grid-column: 3; grid-row: 1; }
  .menu-btn { display: inline-flex; grid-column: 4; grid-row: 1; height: 36px; }
  .nav-list { grid-column: 1 / -1; grid-row: 2; }
  .nav-list { display: none; flex-direction: column; padding-block: 6px 4px; }
  .site-header.open .nav-list { display: flex; }
  .nav-list a { padding: .7rem .4rem; font-size: 1.05rem; border-top: 1px solid var(--rule); border-radius: 0; }
  .nav-list a[aria-current="page"] { box-shadow: inset 3px 0 0 var(--accent); padding-inline-start: .8rem; }
  [dir="rtl"] .nav-list a[aria-current="page"] { box-shadow: inset -3px 0 0 var(--accent); }
}

@media (max-width: 479px) {
  .mark { width: 30px; height: 30px; }
  .brand { gap: 8px; }
  .brand-word { font-size: 20px; }
  .brand-tag { font-size: 6.5px; letter-spacing: 1.5px; margin-top: 5px; }
  .lang { padding: .4rem .55rem; }
  .menu-btn { width: 40px; justify-content: center; padding: 0; }
  .menu-label { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
}
.brand-tag { white-space: nowrap; }
@media (max-width: 379px) { .brand-tag { display: none; } }

/* ---------------------------------------------------------------- shared type */
.eyebrow {
  font-family: var(--f-mono); font-size: .76rem; text-transform: uppercase; letter-spacing: var(--tr);
  color: var(--accent); margin-bottom: 18px;
}
[dir="rtl"] .eyebrow { font-family: var(--f-body); font-size: .9rem; text-transform: none; }
h1 {
  font-size: var(--s4); line-height: 1.04; font-weight: 700; letter-spacing: -.012em;
  font-variation-settings: "wdth" var(--wdth);
}
[dir="rtl"] h1 { line-height: 1.4; letter-spacing: 0; font-size: clamp(2rem, 4vw, 3.2rem); }
.lede { font-size: var(--s1); color: var(--ink-2); max-width: var(--measure); margin-top: 22px; }
.section-title { font-size: var(--s2); font-weight: 700; font-variation-settings: "wdth" 108; line-height: 1.2; }
[dir="rtl"] .section-title { line-height: 1.5; }
.section-lede { color: var(--ink-2); max-width: var(--measure); margin-top: 12px; font-size: 1.05rem; }
.text-link { color: var(--ifr); font-weight: 500; text-underline-offset: 3px; }

.btn {
  display: inline-flex; align-items: center; min-height: 44px; padding: .65rem 1.15rem;
  border: 1.5px solid var(--ink); border-radius: 2px; text-decoration: none; font-weight: 500;
  color: var(--ink); background: transparent; transition: background .15s, color .15s;
}
.btn:hover { background: var(--ink); color: var(--paper); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }

.chip {
  display: inline-block; font-family: var(--f-mono); font-size: .7rem; text-transform: uppercase;
  letter-spacing: .07em; padding: .28em .65em; border-radius: 2px; white-space: nowrap;
}
[dir="rtl"] .chip { font-family: var(--f-body); font-size: .8rem; letter-spacing: 0; text-transform: none; }
.chip-active { background: var(--chip-a-bg); color: var(--chip-a-fg); }
.chip-dev { background: var(--chip-d-bg); color: var(--chip-d-fg); }

/* ---------------------------------------------------------------- hero */
.hero {
  padding-block: 56px 64px; border-bottom: 1px solid var(--rule);
  background:
    linear-gradient(var(--grat) 1px, transparent 1px) 0 0 / 100% 48px,
    var(--paper);
}
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); gap: 48px; align-items: center; }
.hero-copy { min-width: 0; }
.hero-fig { margin: 0; min-width: 0; }
.hero-chart { display: block; width: 100%; height: auto; background: var(--sheet); border: 1px solid var(--rule); }
.hero-fig figcaption {
  display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 12px; margin-top: 12px;
  font-size: .85rem; color: var(--ink-2);
}
.hero-fig figcaption .mono { color: var(--accent); font-weight: 500; }
.phase-strip { display: contents; list-style: none; }
.phase-strip li {
  font-family: var(--f-mono); font-size: .74rem; padding: .15rem .5rem; border: 1px solid var(--rule);
  border-radius: 2px; background: var(--sheet);
}
[dir="rtl"] .phase-strip li { font-family: var(--f-body); font-size: .82rem; }
@media (max-width: 899px) {
  .hero { padding-block: 36px 44px; }
  .hero-grid { grid-template-columns: minmax(0, 1fr); gap: 32px; }
}

/* chart + illustrations */
.grat { stroke: var(--grat); stroke-width: 1; }
.fir { stroke: var(--fir); stroke-width: 1.4; fill: var(--fir-fill); stroke-dasharray: 9 4 2 4; }
.track { stroke: var(--accent); stroke-width: 2.6; fill: none; stroke-linecap: round; }
.track-shadow { stroke: var(--sheet); stroke-width: 9; fill: none; }
.pt { fill: var(--sheet); stroke: var(--accent); stroke-width: 2; }
.pl { fill: var(--accent); font-family: var(--f-mono); font-size: 12px; font-weight: 500; }
.tx { fill: var(--ink-2); font-family: var(--f-mono); font-size: 9.5px; }
.hero-chart .tx { font-size: 11px; }
.txa { fill: var(--accent); font-family: var(--f-mono); font-size: 11px; font-weight: 500; }
.plane path { fill: var(--ink); }
.plane {
  offset-path: path("M86 300 Q300 40 520 196"); offset-rotate: auto 90deg;
  offset-distance: 52%; animation: fly 16s linear infinite;
}
@keyframes fly { from { offset-distance: 0%; } to { offset-distance: 100%; } }
@media (prefers-reduced-motion: reduce) { .plane { animation: none; offset-distance: 52%; } }

.illus { display: block; width: 100%; height: auto; }
.illus .ln { stroke: var(--ink); stroke-width: 1.6; fill: none; stroke-linecap: round; stroke-linejoin: round; }
.illus .ln2 { stroke: var(--ink-2); stroke-width: 1.1; fill: none; opacity: .75; }
.illus .lnf { fill: var(--ink); }
.illus .acc { stroke: var(--accent); stroke-width: 2.2; fill: none; stroke-linecap: round; stroke-linejoin: round; }
.illus .accf { fill: var(--accent); }
.illus .bluf { fill: var(--ifr); }
.illus .pap { fill: var(--sheet); stroke: var(--ink); stroke-width: 1.3; }
.illus .sweep { fill: var(--accent); opacity: .13; }
.illus .bar-a { fill: var(--ifr); opacity: .4; }
.illus .bar-b { fill: var(--ifr); }
.illus .bar-c { fill: var(--accent); }
.illus .cone { fill: var(--accent); opacity: .12; }

/* ---------------------------------------------------------------- bands */
.band { padding-block: 72px; }
.band-alt { background: var(--sheet); border-block: 1px solid var(--rule); }
@media (max-width: 719px) { .band { padding-block: 52px; } }

.families { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px; margin-top: 36px; }
.families { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.family { border-top: 2px solid var(--ink); padding-top: 18px; min-width: 0; display: flex; flex-direction: column; gap: 12px; }
.family h3 { font-size: 1.35rem; font-variation-settings: "wdth" 108; }
.family h3 a { text-decoration: none; }
.family h3 a:hover { color: var(--accent); }
.family > p { color: var(--ink-2); }
.fam-list { list-style: none; margin: 4px 0 0; padding: 0; }
.fam-list a {
  display: grid; grid-template-columns: 5.5rem minmax(0, 1fr); gap: 12px; padding: .55rem 0;
  border-top: 1px solid var(--rule); text-decoration: none; align-items: baseline;
}
.fam-list a:hover .mono { color: var(--accent); }
.fam-list .mono { font-weight: 500; font-size: .9rem; }
.fam-full { color: var(--ink-2); font-size: .92rem; }
@media (max-width: 1099px) { .families { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 40px 32px; } }
@media (max-width: 659px) { .families { grid-template-columns: minmax(0, 1fr); } }

.flow {
  list-style: none; margin: 36px 0 0; padding: 0;
  display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 28px;
}
.flow li {
  position: relative; min-width: 0; padding: 16px; border: 1px solid var(--rule);
  border-radius: 3px; background: var(--paper); display: flex; flex-direction: column; gap: 8px;
}
.flow li:not(:last-child)::after {
  content: "→"; position: absolute; top: 50%; inset-inline-end: -22px; transform: translateY(-50%);
  color: var(--accent); font-family: var(--f-mono); font-size: 1.3rem; line-height: 1;
}
[dir="rtl"] .flow li:not(:last-child)::after { content: "←"; }
.flow-hl { border-color: var(--accent) !important; box-shadow: inset 0 3px 0 var(--accent); }
.flow-k { font-family: var(--f-display); font-weight: 700; font-size: 1.05rem; display: flex; flex-wrap: wrap; gap: 6px; }
.flow-hl .flow-k { font-family: var(--f-mono); }
.flow-d { font-size: .88rem; color: var(--ink-2); }
.tag { font-family: var(--f-mono); font-size: .8rem; font-weight: 500; padding: .1rem .4rem; border: 1px solid var(--rule); border-radius: 2px; background: var(--sheet); }
@media (max-width: 999px) {
  .flow { grid-template-columns: minmax(0, 1fr); gap: 26px; max-width: 560px; }
  .flow li:not(:last-child)::after, [dir="rtl"] .flow li:not(:last-child)::after {
    content: "↓"; top: auto; bottom: -24px; inset-inline-end: auto; inset-inline-start: 22px; transform: none;
  }
}

.since { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 48px; align-items: start; }
.since-year {
  font-family: "Archivo", var(--f-mono); font-weight: 800; font-variation-settings: "wdth" 125;
  font-size: clamp(3.5rem, 9vw, 7rem); line-height: .9; color: var(--ifr); letter-spacing: -.02em;
}
.since .section-lede { margin-bottom: 16px; }
@media (max-width: 719px) { .since { grid-template-columns: minmax(0, 1fr); gap: 16px; } }

.cta { background: var(--cta-bg); color: var(--cta-fg); padding-block: 56px; }
.cta-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 28px; }
.cta h2 { font-size: var(--s3); font-variation-settings: "wdth" 108; line-height: 1.15; max-width: 26ch; }
[dir="rtl"] .cta h2 { line-height: 1.5; }
.cta p { color: var(--cta-fg-2); margin-top: 10px; }
.cta .btn-primary:hover { background: var(--cta-fg); border-color: var(--cta-fg); color: var(--cta-bg); }

/* ---------------------------------------------------------------- inner pages */
.intro { padding-block: 56px 40px; border-bottom: 1px solid var(--rule); }
.intro h1 { max-width: 22ch; }
.jump { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; margin: 28px 0 0; padding: 0; }
.jump a {
  display: inline-block; font-family: var(--f-mono); font-size: .85rem; font-weight: 500;
  text-decoration: none; padding: .35rem .75rem; border: 1px solid var(--rule); border-radius: 2px; background: var(--sheet);
}
.jump a:hover { border-color: var(--accent); color: var(--accent); }
.title-sub { margin-top: 10px; color: var(--ink-2); font-size: .9rem; }
[dir="rtl"] .title-sub { font-family: var(--f-body); }

.products { padding-block: 8px 72px; }
.product {
  display: grid; grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr); gap: 48px;
  padding-block: 56px; border-bottom: 1px solid var(--rule); scroll-margin-top: 80px; align-items: start;
}
.product:last-child { border-bottom: 0; }
.product-fig {
  margin: 0; min-width: 0; background: var(--sheet); border: 1px solid var(--rule); border-radius: 3px;
  padding: 24px; position: sticky; top: calc(88px + env(safe-area-inset-top, 0px));
  background-image: linear-gradient(var(--grat) 1px, transparent 1px), linear-gradient(90deg, var(--grat) 1px, transparent 1px);
  background-size: 24px 24px; background-position: -1px -1px;
}
.product-body { min-width: 0; }
.product-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 16px; }
.code {
  font-family: "Archivo", var(--f-display); font-weight: 800; font-variation-settings: "wdth" 125;
  font-size: clamp(2.4rem, 5vw, 3.5rem); line-height: 1; letter-spacing: .01em; flex-basis: 100%;
}
.full { font-size: 1.1rem; color: var(--ink-2); font-weight: 500; }
.summary { font-size: 1.12rem; margin-top: 18px; max-width: var(--measure); }
.spec { list-style: none; margin: 22px 0 0; padding: 0; display: grid; gap: 0; max-width: 72ch; }
.spec li {
  position: relative; padding-block: .62rem; padding-inline-start: 22px; border-top: 1px solid var(--rule);
}
.spec li::before {
  content: ""; position: absolute; inset-inline-start: 2px; top: 1.15rem; width: 8px; height: 8px;
  border: 1.5px solid var(--ifr); transform: rotate(45deg);
}
[dir="rtl"] .spec li::before { top: 1.3rem; }
@media (max-width: 819px) {
  .product { grid-template-columns: minmax(0, 1fr); gap: 24px; padding-block: 40px; }
  .product-fig { position: static; max-width: 460px; }
}

.note {
  margin-top: 40px; padding: 18px 20px; background: var(--sheet); border: 1px solid var(--rule);
  border-inline-start: 3px solid var(--accent); max-width: 72ch;
}
.note-k { font-size: .74rem; text-transform: uppercase; letter-spacing: var(--tr); color: var(--accent); margin-bottom: 4px; }
[dir="rtl"] .note-k { font-family: var(--f-body); font-size: .85rem; }

.company { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 64px; padding-block: 56px 72px; }
.founder { display: flex; flex-direction: column; gap: 14px; max-width: var(--measure); }
.person { font-family: "Archivo", var(--f-display); font-size: 1.6rem; font-weight: 700; font-variation-settings: "wdth" 112; display: flex; flex-direction: column; margin-block: 6px 4px; }
.person span { font-family: var(--f-body); font-size: .95rem; font-weight: 500; color: var(--accent); }
.founder > p:not(.person) { color: var(--ink-2); }
.timeline { list-style: none; margin: 24px 0 0; padding: 0; border-inline-start: 2px solid var(--rule); }
.timeline li { position: relative; display: grid; gap: 2px; padding-inline-start: 22px; padding-bottom: 22px; }
.timeline li::before {
  content: ""; position: absolute; inset-inline-start: -7px; top: .45rem; width: 12px; height: 12px;
  border-radius: 50%; background: var(--paper); border: 2px solid var(--accent);
}
.tl-y { font-size: .85rem; font-weight: 500; color: var(--accent); font-variant-numeric: tabular-nums; }
@media (max-width: 899px) { .company { grid-template-columns: minmax(0, 1fr); gap: 48px; } }

.contact-list { margin: 0; display: grid; gap: 14px; min-width: 0; }
.contact-list div { display: grid; gap: 2px; }
.contact-list dt { font-size: .8rem; color: var(--cta-fg-2); }
.contact-list dd { margin: 0; display: flex; flex-wrap: wrap; align-items: center; gap: 10px; font-size: 1.15rem; overflow-wrap: anywhere; }
.copy-btn {
  font: inherit; font-size: .8rem; color: var(--cta-fg); background: transparent; cursor: pointer;
  border: 1px solid var(--cta-fg-2); border-radius: 2px; padding: .25rem .6rem;
}
.copy-btn:hover { border-color: var(--cta-fg); }

/* ---------------------------------------------------------------- footer */
.site-footer { border-top: 1px solid var(--rule); padding-block: 48px 28px; font-size: .92rem; }
.foot { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr); gap: 40px; }
.f-brand { display: flex; flex-direction: column; gap: 12px; color: var(--ink-2); }
.f-brand .mono { font-size: .82rem; }
.f-cols { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 24px; }
.f-head a { font-weight: 600; text-decoration: none; }
.f-list { color: var(--ink-2); margin-top: 6px; }
.f-list a { text-decoration: none; font-family: var(--f-mono); font-size: .85rem; }
.f-list a:hover, .f-head a:hover { color: var(--accent); }
.f-legal { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; margin-top: 40px; padding-top: 18px; border-top: 1px solid var(--rule); color: var(--ink-2); font-size: .82rem; }
.f-legal a { text-decoration: none; }
@media (max-width: 899px) { .foot { grid-template-columns: minmax(0, 1fr); } }
@media (max-width: 759px) { .f-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; } }
@media (max-width: 419px) { .f-cols { grid-template-columns: minmax(0, 1fr); gap: 16px; } }

/* ---------------------------------------------------------------- 404 */
.nf-grid { display: grid; grid-template-columns: auto minmax(0, 1fr) minmax(0, 1fr); gap: 40px; align-items: start; }
.nf-code { font-size: clamp(4rem, 12vw, 8rem); line-height: .9; color: var(--accent); font-weight: 500; }
.nf-blk { display: flex; flex-direction: column; gap: 14px; }
.nf-blk h1 { font-size: var(--s3); }
.nf-blk[dir="rtl"] { font-family: "IBM Plex Sans Arabic", var(--f-body); }
.nf-blk[dir="rtl"] h1 { font-family: "Noto Kufi Arabic", var(--f-display); line-height: 1.5; letter-spacing: 0; }
@media (max-width: 819px) { .nf-grid { grid-template-columns: minmax(0, 1fr); } }

/* ---------------------------------------------------------------- portfolio */
.filters { margin-top: 30px; }
.filters ul { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; }
.filter-btn {
  font: inherit; font-size: .9rem; color: var(--ink); background: var(--sheet); cursor: pointer;
  border: 1px solid var(--rule); border-radius: 2px; padding: .45rem .8rem; display: inline-flex; gap: 8px; align-items: baseline;
}
.filter-btn:hover { border-color: var(--ink-2); }
.filter-btn[aria-pressed="true"] { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.filter-btn .count { font-size: .75rem; opacity: .7; }
.portfolio { padding-block: 40px 72px; }
.cards {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px;
}
@media (max-width: 999px) { .cards { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 599px) { .cards { grid-template-columns: minmax(0, 1fr); } }
.card { min-width: 0; }
.card a {
  display: flex; flex-direction: column; gap: 10px; height: 100%; min-height: 216px; padding: 20px 22px;
  background: var(--sheet); border: 1px solid var(--rule); border-radius: 3px; text-decoration: none;
  transition: border-color .15s, transform .15s;
}
.card a:hover { border-color: var(--accent); transform: translateY(-2px); }
@media (prefers-reduced-motion: reduce) { .card a:hover { transform: none; } }
.card-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.card-code { color: var(--accent); font-size: .8rem; font-weight: 500; letter-spacing: .04em; }
.card-title { font-family: var(--f-display); font-size: 1.3rem; font-weight: 700; line-height: 1.2; font-variation-settings: "wdth" 104; }
[dir="rtl"] .card-title { line-height: 1.5; font-size: 1.15rem; }
.card-text {
  color: var(--ink-2); font-size: .95rem;
  display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 3; line-clamp: 3; overflow: hidden;
}
.cards .card-note { grid-column: span 2; align-self: stretch; }
.cards .card-note .note { margin: 0; height: 100%; display: flex; align-items: center; max-width: none; }
@media (max-width: 999px) { .cards .card-note { grid-column: 1 / -1; } }
.card-meta {
  margin-top: auto; padding-top: 12px; border-top: 1px solid var(--rule);
  display: flex; justify-content: space-between; gap: 12px; font-size: .82rem;
}
.card-cat { color: var(--ink-2); }
.card-go { font-weight: 500; }
.card a:hover .card-go { color: var(--accent); }


/* ---------------------------------------------------------------- hero system map
   One deliberate dark panel in both themes, carried over from the original aerosys.co hero. */
.hero-art {
  --art-bg: #0A202A; --art-line: #6E9D90; --art-link: #BDCEBA; --art-dot: #D8E9D4;
  --art-text: #C3D7CE; --art-dim: #7FA197; --art-hot: #EF7954;
  position: relative; background: var(--art-bg); border-radius: 3px; overflow: hidden;
  border: 1px solid var(--rule); color: var(--art-text);
}
.hero-art svg { display: block; width: 100%; height: auto; }
.art-label, .art-foot {
  position: absolute; inset-inline: 22px; font-family: var(--f-mono); font-size: .62rem;
  letter-spacing: .14em; color: var(--art-text); margin: 0; pointer-events: none;
}
.art-label { top: 18px; }
.art-foot { bottom: 16px; display: flex; justify-content: space-between; gap: 12px; color: var(--art-dim); }
[dir="rtl"] .art-label, [dir="rtl"] .art-foot { font-family: var(--f-body); font-size: .78rem; letter-spacing: 0; }
.g-globe ellipse, .g-globe circle, .g-globe path { stroke: var(--art-line); stroke-width: .8; fill: none; }
.g-orbit ellipse { stroke: #D2795F; stroke-width: 1; stroke-dasharray: 3 6; fill: none; }
.g-orbit-2 ellipse { stroke: var(--art-line); opacity: .55; stroke-dasharray: 1 7; }
.g-orbit { animation: g-turn 90s linear infinite; }
.g-orbit-2 { animation-duration: 140s; animation-direction: reverse; }
@keyframes g-turn { to { transform: rotate(360deg); } }
.g-link { stroke: var(--art-link); stroke-width: 1; fill: none; opacity: .75; }
.g-pulse {
  stroke: var(--art-hot); stroke-width: 2.2; fill: none; stroke-linecap: round;
  stroke-dasharray: 5 95; stroke-dashoffset: 100; animation: g-flow 5.4s linear infinite;
}
@keyframes g-flow { to { stroke-dashoffset: 0; } }
.g-core-ring { fill: none; stroke: var(--art-hot); opacity: .4; }
.g-core-wave { fill: none; stroke: var(--art-hot); transform-box: fill-box; transform-origin: center; animation: g-wave 3.2s ease-out infinite; }
@keyframes g-wave { from { transform: scale(1); opacity: .55; } to { transform: scale(2.6); opacity: 0; } }
.g-core-dot { fill: var(--art-hot); }
.g-hit { fill: transparent; }
.g-ring { fill: none; stroke: var(--art-dot); opacity: 0; transition: opacity .2s; }
.g-dot { fill: var(--art-dot); transition: fill .2s; }
.g-t { fill: var(--art-text); font-family: var(--f-mono); font-size: 10px; letter-spacing: 1.4px; }
[dir="rtl"] .g-t { font-family: var(--f-body); font-size: 12px; letter-spacing: 0; }
.g-core-t { fill: #F19879; font-weight: 500; }
.g-c { fill: var(--art-dim); font-family: var(--f-mono); font-size: 8.5px; letter-spacing: .6px; }
.g-node { cursor: pointer; }
.g-node:hover .g-dot, .g-node:focus-visible .g-dot { fill: var(--art-hot); }
.g-node:hover .g-ring, .g-node:focus-visible .g-ring { opacity: .8; stroke: var(--art-hot); }
.g-node:hover .g-t, .g-node:focus-visible .g-t { fill: #FFFFFF; }
.g-node:focus { outline: none; }
@media (prefers-reduced-motion: reduce) {
  .g-orbit, .g-pulse, .g-core-wave { animation: none; }
  .g-pulse { display: none; }
}

/* ---------------------------------------------------------------- ARCS section */
.arcs-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: 56px; align-items: center; }
.arcs-fig { margin: 0; min-width: 0; }
.arcs-copy { min-width: 0; display: flex; flex-direction: column; gap: 16px; }
.arcs-copy .eyebrow { margin-bottom: 0; }
.arcs-copy .section-lede { margin-top: 0; }
.phases { list-style: none; margin: 4px 0 0; padding: 0; display: grid; gap: 0; }
.phases li {
  display: grid; grid-template-columns: 2.25rem minmax(0, 1fr); column-gap: 14px; row-gap: 2px;
  padding-block: 12px; border-top: 1px solid var(--rule);
}
.phases li:last-child { border-bottom: 1px solid var(--rule); }
.ph-k {
  grid-row: span 2; width: 2rem; height: 2rem; border-radius: 50%; border: 2px solid var(--accent);
  color: var(--accent); display: grid; place-items: center; font-weight: 500; font-size: .9rem;
}
.ph-t { font-weight: 600; }
.ph-d { color: var(--ink-2); font-size: .95rem; }
@media (max-width: 899px) { .arcs-grid { grid-template-columns: minmax(0, 1fr); gap: 32px; } }
.g-t, .g-c { paint-order: stroke; stroke: var(--art-bg); stroke-width: 4px; stroke-linejoin: round; }
@media (max-width: 599px) {
  .g-t { font-size: 15px; letter-spacing: .6px; }
  [dir="rtl"] .g-t { font-size: 16px; }
  .g-c { display: none; }
  .art-label, .art-foot { font-size: .58rem; inset-inline: 14px; }
  .art-label { top: 12px; } .art-foot { bottom: 10px; }
}
.g-d0 { animation-delay: -0.0s; }
.g-d1 { animation-delay: -0.9s; }
.g-d2 { animation-delay: -1.8s; }
.g-d3 { animation-delay: -2.7s; }
.g-d4 { animation-delay: -3.6s; }
.g-d5 { animation-delay: -4.5s; }
.chip-proposal { background: var(--grat); color: var(--ink-2); border: 1px solid var(--rule); }