/* ============================================================
   C2-I Engineering — home.css
   Elevated, defense-grade homepage direction. Near-monochrome,
   large-scale type, monospaced technical detailing. Standalone
   sheet: the homepage loads only this file, not the three
   production sheets. Nav and footer reuse production class
   names so js/main.js drives them unchanged.
   ============================================================ */

@font-face {
  font-family: 'Montserrat';
  font-style: normal;
  font-weight: 400 800;
  font-display: swap;
  src: url('../assets/fonts/montserrat-var.woff2') format('woff2');
}
@font-face {
  font-family: 'Open Sans';
  font-style: normal;
  font-weight: 400 600;
  font-display: swap;
  src: url('../assets/fonts/opensans-var.woff2') format('woff2');
}

:root {
  --ink:        #0B0B08;
  --ink-2:      #101009;
  --paper:      #F4F4EE;
  --paper-dim:  rgba(244, 244, 238, 0.60);
  --paper-faint:rgba(244, 244, 238, 0.38);
  --line:       rgba(244, 244, 238, 0.14);
  --line-2:     rgba(244, 244, 238, 0.26);

  --olive:        #75824F;
  --olive-bright: #AEBB7C;
  --olive-light:  #C8C8A9;

  --sans: 'Montserrat', system-ui, -apple-system, sans-serif;
  --body: 'Open Sans', system-ui, -apple-system, sans-serif;
  --mono: ui-monospace, 'SF Mono', 'JetBrains Mono', Menlo, Consolas, monospace;

  --fs-display: clamp(3.1rem, 9vw, 8rem);
  --fs-h2:      clamp(2rem, 5vw, 4rem);
  --fs-h3:      clamp(1.2rem, 2.1vw, 1.7rem);
  --fs-lead:    clamp(1.05rem, 1.5vw, 1.375rem);
  --fs-mono:    0.75rem;

  --pad: clamp(1.25rem, 5vw, 5rem);
  --maxw: 1320px;
  --nav-h: 70px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; overflow-x: hidden; }
body {
  font-family: var(--body);
  background: var(--ink);
  color: var(--paper);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  padding-top: var(--nav-h);
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }
:focus-visible { outline: 2px solid var(--olive-bright); outline-offset: 3px; }

.wrap, .container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--pad); }

.skip-link {
  position: absolute; top: -100%; left: var(--pad);
  padding: 0.5rem 1rem; background: var(--olive-bright); color: var(--ink);
  font-family: var(--mono); font-size: var(--fs-mono); letter-spacing: 0.1em; text-transform: uppercase;
  z-index: 200; transition: top .2s;
}
.skip-link:focus { top: 0.5rem; }

.mono { font-family: var(--mono); font-size: var(--fs-mono); letter-spacing: 0.16em; text-transform: uppercase; color: var(--olive-bright); }
.mono--dim { color: var(--paper-faint); }

/* ============================================================
   Navigation (production class names, elevated styling)
   ============================================================ */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 100; height: var(--nav-h);
  background: rgba(11, 11, 8, 0.78);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav__inner { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; }
.nav__brand { display: inline-flex; align-items: center; gap: 0.7rem; flex-shrink: 0; }
.nav__logo { height: 32px; width: auto; filter: brightness(0) invert(1); }
.nav__brand-name { font-family: var(--sans); font-weight: 700; font-size: 1rem; letter-spacing: 0.02em; white-space: nowrap; }
.nav__menu { display: flex; align-items: center; gap: 1.5rem; }
.nav__item { position: relative; }
.nav__link, .nav__dropdown-toggle {
  font-family: var(--mono); font-size: var(--fs-mono); letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--paper-dim); padding: 0.4rem 0; white-space: nowrap;
  border-bottom: 1px solid transparent; transition: color .2s, border-color .2s;
}
.nav__link:hover, .nav__link:focus-visible,
.nav__dropdown-toggle:hover, .nav__dropdown-toggle:focus-visible,
.nav__link--active { color: var(--paper); border-bottom-color: var(--olive-bright); }

.nav__dropdown {
  display: none; position: absolute; top: calc(100% + 0.4rem); left: 50%; transform: translateX(-50%);
  min-width: 200px; background: var(--ink-2); border: 1px solid var(--line); padding: 0.4rem;
}
.nav__item--dropdown:hover .nav__dropdown, .nav__item--dropdown:focus-within .nav__dropdown, .nav__dropdown.is-open { display: block; }
.nav__dropdown-link {
  display: block; padding: 0.7rem 0.9rem; font-family: var(--mono); font-size: var(--fs-mono);
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--paper-dim); transition: color .2s, background .2s;
}
.nav__dropdown-link:hover { color: var(--paper); background: rgba(174, 187, 124, 0.08); }

.nav__toggle { display: none; width: 42px; height: 42px; flex-direction: column; gap: 5px; align-items: center; justify-content: center; border: 1px solid var(--line-2); }
.nav__toggle-bar { width: 20px; height: 1.5px; background: var(--paper); display: block; }

@media (max-width: 1100px) {
  .nav__toggle { display: flex; }
  .nav__menu {
    display: none; position: absolute; top: calc(var(--nav-h) + 1px); left: 0; right: 0;
    flex-direction: column; align-items: flex-start; gap: 0;
    background: var(--ink-2); border-bottom: 1px solid var(--line); padding: 0.75rem var(--pad) 1.5rem;
    max-height: calc(100vh - var(--nav-h)); overflow-y: auto;
  }
  .nav__menu.is-open { display: flex; }
  .nav__item { width: 100%; }
  .nav__link, .nav__dropdown-toggle { display: block; width: 100%; padding: 0.9rem 0; }
  .nav__dropdown { position: static; transform: none; border: none; border-left: 1px solid var(--line-2); padding: 0 0 0.5rem 1rem; margin-left: 0.4rem; min-width: 0; }
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  position: relative; min-height: calc(100svh - var(--nav-h)); display: flex; align-items: flex-end;
  padding-bottom: clamp(3rem, 8vh, 7rem); overflow: hidden;
}
.hero__bg {
  position: absolute; inset: 0; z-index: 0;
  background-image: url('../assets/images/hero/hero-home.jpg');
  background-size: cover; background-position: center;
  animation: driftIn 18s ease-out both;
}
@keyframes driftIn { from { transform: scale(1.08); } to { transform: scale(1); } }
.hero__scrim {
  position: absolute; inset: 0; z-index: 1;
  background:
    linear-gradient(180deg, rgba(11,11,8,0.72) 0%, rgba(11,11,8,0.12) 30%, rgba(11,11,8,0.25) 55%, rgba(11,11,8,0.97) 100%),
    linear-gradient(90deg, rgba(11,11,8,0.72) 0%, rgba(11,11,8,0.10) 60%);
}
.hero__inner { position: relative; z-index: 2; width: 100%; }
.hero__eyebrow { display: flex; gap: 0.9rem; flex-wrap: wrap; margin-bottom: 1.6rem; }
.hero__title {
  font-family: var(--sans); font-weight: 800; font-size: var(--fs-display);
  line-height: 0.98; letter-spacing: -0.03em; max-width: 16ch; text-wrap: balance; color: var(--paper);
}
.hero__sub { margin-top: 1.75rem; max-width: 58ch; font-size: var(--fs-lead); color: var(--paper-dim); }
.hero__actions { margin-top: 2.5rem; display: flex; gap: 1rem; flex-wrap: wrap; }
.hero__foot {
  position: absolute; z-index: 2; left: var(--pad); right: var(--pad); bottom: 1.4rem;
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
}
@media (max-width: 620px) { .hero__foot { display: none; } }

.btn {
  display: inline-flex; align-items: center; gap: 0.6rem; min-height: 54px; padding: 0 1.9rem;
  font-family: var(--mono); font-size: var(--fs-mono); letter-spacing: 0.14em; text-transform: uppercase;
  transition: background .2s, color .2s, border-color .2s, transform .2s; white-space: nowrap;
}
.btn--solid { background: var(--olive-bright); color: var(--ink); }
.btn--solid:hover { background: var(--olive-light); transform: translateY(-2px); }
.btn--line { border: 1px solid var(--line-2); color: var(--paper); }
.btn--line:hover { border-color: var(--olive-bright); color: var(--olive-bright); transform: translateY(-2px); }
@media (max-width: 480px) { .hero__actions { flex-direction: column; } .hero__actions .btn { width: 100%; justify-content: center; } }

/* ============================================================
   Sections
   ============================================================ */
.section { padding-block: clamp(4.5rem, 10vw, 9rem); border-top: 1px solid var(--line); }
.section--2 { background: var(--ink-2); }
.section__head { display: flex; align-items: baseline; gap: 1.2rem; margin-bottom: 3rem; }
.section__index { font-family: var(--mono); font-size: var(--fs-mono); letter-spacing: 0.16em; color: var(--olive-bright); flex-shrink: 0; }
.section__title { font-family: var(--sans); font-weight: 800; font-size: var(--fs-h2); line-height: 1.02; letter-spacing: -0.02em; max-width: 22ch; margin-top: 0.6rem; }
.section__label { display: block; }

/* Proof band */
.proof { display: grid; grid-template-columns: repeat(4, 1fr); }
.proof__item { padding: 2.25rem 0 2.25rem 1.4rem; border-left: 1px solid var(--line); }
.proof__item:first-child { border-left: none; padding-left: 0; }
.proof__num { font-family: var(--sans); font-weight: 800; font-size: clamp(2.5rem, 5vw, 4rem); line-height: 1; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.proof__label { margin-top: 0.8rem; font-family: var(--mono); font-size: var(--fs-mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--paper-dim); line-height: 1.5; }
@media (max-width: 720px) { .proof { grid-template-columns: 1fr 1fr; } .proof__item:nth-child(3) { border-left: none; padding-left: 0; } }

/* Doctrine */
.doctrine__statement { font-family: var(--sans); font-weight: 800; font-size: clamp(2.4rem, 7vw, 6rem); line-height: 1.0; letter-spacing: -0.03em; max-width: 15ch; }
.doctrine__statement em { color: var(--olive-bright); font-style: normal; }
.doctrine__body { margin-top: 2rem; max-width: 62ch; font-size: var(--fs-lead); color: var(--paper-dim); }

/* Terrain rows */
.rows { border-top: 1px solid var(--line-2); }
.row { display: grid; grid-template-columns: 5rem 1fr 1.4fr; gap: 2rem; align-items: start; padding: 2.5rem 0; border-bottom: 1px solid var(--line); transition: background .3s; }
.row:hover { background: rgba(174, 187, 124, 0.04); }
.row__idx { font-family: var(--mono); font-size: var(--fs-mono); letter-spacing: 0.14em; color: var(--olive-bright); padding-top: 0.5rem; }
.row__title { font-family: var(--sans); font-weight: 700; font-size: var(--fs-h3); letter-spacing: -0.01em; }
.row__desc { color: var(--paper-dim); line-height: 1.7; }
@media (max-width: 820px) { .row { grid-template-columns: 1fr; gap: 0.75rem; } .row__idx { padding-top: 0; } }

/* Capabilities */
.caps { display: grid; grid-template-columns: repeat(4, 1fr); border-left: 1px solid var(--line); }
.cap { padding: 2rem 1.6rem; border-right: 1px solid var(--line); border-top: 1px solid var(--line); min-height: 260px; display: flex; flex-direction: column; transition: background .3s; }
.cap:hover { background: rgba(174, 187, 124, 0.05); }
.cap__idx { font-family: var(--mono); font-size: var(--fs-mono); color: var(--olive-bright); letter-spacing: 0.14em; }
.cap__title { font-family: var(--sans); font-weight: 700; font-size: var(--fs-h3); margin-top: 1.5rem; letter-spacing: -0.01em; }
.cap__desc { margin-top: 0.9rem; font-size: 0.95rem; color: var(--paper-dim); line-height: 1.65; }
.cap__more { margin-top: auto; padding-top: 1.4rem; }
.cap__more .mono { color: var(--paper); transition: color .2s; }
.cap:hover .cap__more .mono { color: var(--olive-bright); }
@media (max-width: 980px) { .caps { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .caps { grid-template-columns: 1fr; } }

/* Record */
.record { border-top: 1px solid var(--line-2); }
.record__row { display: flex; align-items: baseline; justify-content: space-between; gap: 1.5rem; padding: 1.8rem 0; border-bottom: 1px solid var(--line); }
.record__name { font-family: var(--sans); font-weight: 700; font-size: clamp(1.4rem, 3.5vw, 2.6rem); letter-spacing: -0.02em; }
.record__meta { font-family: var(--mono); font-size: var(--fs-mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--paper-faint); text-align: right; white-space: nowrap; }
@media (max-width: 620px) { .record__row { flex-direction: column; gap: 0.4rem; } .record__meta { text-align: left; white-space: normal; } }

/* Close */
.close { padding-block: clamp(5rem, 12vw, 11rem); text-align: center; border-top: 1px solid var(--line); }
.close__eyebrow { margin-bottom: 1.5rem; }
.close__title { font-family: var(--sans); font-weight: 800; font-size: var(--fs-h2); letter-spacing: -0.02em; max-width: 18ch; margin-inline: auto; line-height: 1.02; }
.close__sub { margin-top: 1.4rem; color: var(--paper-dim); font-size: var(--fs-lead); max-width: 52ch; margin-inline: auto; }
.close__actions { margin-top: 2.5rem; display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* ============================================================
   Footer (production class names, elevated styling)
   ============================================================ */
.footer { border-top: 1px solid var(--line); padding-block: clamp(3rem, 6vw, 5rem) 2.5rem; background: var(--ink); }
.footer__inner { display: grid; grid-template-columns: 1fr 2fr; gap: 3rem; align-items: start; margin-bottom: 3rem; }
.footer__brand { display: flex; flex-direction: column; gap: 1rem; }
.footer__brand-link { display: inline-flex; align-items: center; gap: 0.7rem; }
.footer__logo { height: 32px; width: auto; filter: brightness(0) invert(1); }
.footer__brand-name { font-family: var(--sans); font-weight: 700; font-size: 1rem; letter-spacing: 0.02em; }
.footer__tagline { font-family: var(--mono); font-size: var(--fs-mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--paper-faint); line-height: 1.7; max-width: 32ch; }
.footer__nav { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.footer__nav-group { display: flex; flex-direction: column; gap: 1rem; }
.footer__nav-heading { font-family: var(--mono); font-size: var(--fs-mono); font-weight: 400; letter-spacing: 0.14em; text-transform: uppercase; color: var(--olive-bright); }
.footer__nav-list { display: flex; flex-direction: column; gap: 0.7rem; }
.footer__nav-link { font-size: 0.95rem; color: var(--paper-dim); transition: color .2s; }
.footer__nav-link:hover { color: var(--paper); }
.footer__bottom { padding-top: 2rem; border-top: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 1rem; }
.footer__copyright, .footer__legal-link { font-family: var(--mono); font-size: var(--fs-mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--paper-faint); }
.footer__legal-link { transition: color .2s; }
.footer__legal-link:hover { color: var(--paper); }
@media (max-width: 767px) {
  .footer__inner { grid-template-columns: 1fr; gap: 2.5rem; }
  .footer__nav { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 460px) { .footer__nav { grid-template-columns: 1fr; } }

/* ============================================================
   Motion
   ============================================================ */
.fade-in { opacity: 0; transform: translateY(28px); transition: opacity .8s cubic-bezier(.16,1,.3,1), transform .8s cubic-bezier(.16,1,.3,1); }
.fade-in.is-visible { opacity: 1; transform: none; }
.row.fade-in:nth-child(2) { transition-delay: .08s; }
.row.fade-in:nth-child(3) { transition-delay: .16s; }
.cap.fade-in:nth-child(2) { transition-delay: .06s; }
.cap.fade-in:nth-child(3) { transition-delay: .12s; }
.cap.fade-in:nth-child(4) { transition-delay: .18s; }

@media (prefers-reduced-motion: reduce) {
  .fade-in { opacity: 1; transform: none; transition: none; }
  .hero__bg { animation: none; }
  html { scroll-behavior: auto; }
}