/* ============================================================
   InteliRosa — Shared Design System
   Warm editorial studio brand + phosphor-green terminal accent
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root {
  /* Studio palette */
  --rose:       #9A3B38;  /* Heritage Rose  — primary  */
  --rose-deep:  #7C2E2C;  /* darker rose for hovers     */
  --brass:      #C6A477;  /* Burnished Brass — secondary*/
  --brass-deep: #A8854F;
  --ink:        #2B2B2A;  /* Charcoal Ink — text        */
  --ink-soft:   #54514E;  /* muted body text            */
  --ink-faint:  #87827C;  /* captions / labels          */
  --linen:      #E8E3DB;  /* Woven Linen — background    */
  --alabaster:  #F7F5F0;  /* Alabaster Matte — surface   */
  --line:       rgba(43,43,42,0.14);
  --line-soft:  rgba(43,43,42,0.08);

  /* Orbital L0G terminal palette */
  --phosphor:      #3DFF6E;
  --phosphor-dim:  #1f8a3e;
  --phosphor-soft: rgba(61,255,110,0.62);
  --terminal-bg:   #050807;
  --terminal-panel:#0b110d;

  /* Type */
  --sans: "Hanken Grotesk", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  /* Rhythm */
  --maxw: 1200px;
  --gutter: clamp(1.25rem, 4vw, 3.5rem);
  --radius: 14px;
  --radius-lg: 22px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  background: var(--linen);
  color: var(--ink);
  line-height: 1.65;
  font-size: 18px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
h1, h2, h3, h4 { line-height: 1.08; font-weight: 700; letter-spacing: -0.018em; text-wrap: balance; }
p { text-wrap: pretty; }

/* ---------- Layout helpers ---------- */
.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); }
.section { padding-block: clamp(4rem, 9vw, 8rem); }
.eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--rose);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
}
.eyebrow::before {
  content: "";
  width: 1.7em; height: 1px;
  background: var(--brass-deep);
}
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 0.6em;
  font-weight: 600; font-size: 1rem;
  padding: 0.95rem 1.7rem; border-radius: 100px;
  border: 1px solid transparent;
  transition: transform .18s ease, background .18s ease, color .18s ease, border-color .18s ease;
  line-height: 1;
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--rose); color: var(--alabaster); }
.btn--primary:hover { background: var(--rose-deep); }
.btn--ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn--ghost:hover { border-color: var(--ink); }
.btn--brass { background: var(--ink); color: var(--alabaster); }
.btn--brass:hover { background: #000; }
.btn .arr { transition: transform .2s ease; }
.btn:hover .arr { transform: translateX(3px); }

/* ============================================================
   Header / Navigation
   ============================================================ */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--linen) 86%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line-soft);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 76px;
}
.brand {
  display: inline-flex; align-items: baseline; gap: 0.1em;
  font-weight: 800; font-size: 1.32rem; letter-spacing: -0.03em;
  color: var(--ink);
}
.brand b { color: var(--rose); font-weight: 800; }
.brand .mark {
  font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.18em;
  color: var(--brass-deep); transform: translateY(-0.9em); margin-left: 0.35em;
  font-weight: 500;
}
.nav-links {
  display: flex; align-items: center; gap: clamp(1.2rem, 2.5vw, 2.4rem);
  list-style: none;
}
.nav-links a {
  font-size: 0.96rem; font-weight: 500; color: var(--ink-soft);
  position: relative; padding-block: 0.4rem; transition: color .15s ease;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a[aria-current="page"] { color: var(--rose); }
.nav-links a[aria-current="page"]::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px;
  height: 2px; background: var(--rose); border-radius: 2px;
}
.nav-cta { margin-left: 0.5rem; }
.nav-toggle {
  display: none; width: 44px; height: 44px; border: 1px solid var(--line);
  background: transparent; border-radius: 10px; padding: 0;
  align-items: center; justify-content: center;
}
.nav-toggle span {
  display: block; width: 19px; height: 1.8px; background: var(--ink);
  position: relative; transition: transform .25s ease, opacity .2s ease;
}
.nav-toggle span::before, .nav-toggle span::after {
  content: ""; position: absolute; left: 0; width: 19px; height: 1.8px;
  background: var(--ink); transition: transform .25s ease;
}
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after  { top: 6px; }
.nav-toggle[aria-expanded="true"] span { background: transparent; }
.nav-toggle[aria-expanded="true"] span::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span::after  { transform: translateY(-6px) rotate(-45deg); }

/* Dark header variant (Orbital L0G page) */
.site-header--dark {
  background: color-mix(in srgb, var(--terminal-bg) 78%, transparent);
  border-bottom: 1px solid rgba(61,255,110,0.16);
}
.site-header--dark .brand { color: #ECEFE9; }
.site-header--dark .brand b { color: var(--phosphor); }
.site-header--dark .brand .mark { color: var(--phosphor-soft); }
.site-header--dark .nav-links a { color: rgba(236,239,233,0.66); }
.site-header--dark .nav-links a:hover { color: #fff; }
.site-header--dark .nav-links a[aria-current="page"] { color: var(--phosphor); }
.site-header--dark .nav-links a[aria-current="page"]::after { background: var(--phosphor); }
.site-header--dark .nav-cta .btn--primary { background: var(--phosphor); color: #000000; }
.site-header--dark .btn--primary:hover { background: #6dff92; }
.site-header--dark .nav-toggle { border-color: rgba(61,255,110,0.3); }
.site-header--dark .nav-toggle span,
.site-header--dark .nav-toggle span::before,
.site-header--dark .nav-toggle span::after { background: var(--phosphor); }

/* ---------- Mobile nav ---------- */
@media (max-width: 860px) {
  .nav-toggle { display: inline-flex; }
  .nav-links {
    position: fixed; inset: 76px 0 auto 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--alabaster);
    border-bottom: 1px solid var(--line);
    padding: 0.5rem var(--gutter) 1.5rem;
    transform: translateY(-12px); opacity: 0; pointer-events: none;
    transition: transform .26s ease, opacity .22s ease;
    box-shadow: 0 24px 40px -28px rgba(0,0,0,.4);
  }
  .nav-links.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav-links li { border-bottom: 1px solid var(--line-soft); }
  .nav-links a { display: block; padding: 1.05rem 0; font-size: 1.08rem; }
  .nav-links a[aria-current="page"]::after { display: none; }
  .nav-cta { margin: 1.1rem 0 0; }
  .nav-cta .btn { width: 100%; justify-content: center; }
  .site-header--dark .nav-links { background: var(--terminal-panel); border-color: rgba(61,255,110,0.16); }
  .site-header--dark .nav-links li { border-color: rgba(61,255,110,0.12); }
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  background: var(--ink); color: rgba(247,245,240,0.72);
  padding-block: clamp(3rem, 6vw, 4.5rem) 2rem;
}
.footer-grid {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 2.5rem;
  padding-bottom: 2.5rem; border-bottom: 1px solid rgba(247,245,240,0.12);
}
.footer-brand .brand { color: var(--alabaster); }
.footer-brand .brand b { color: var(--brass); }
.footer-brand p { margin-top: 1rem; max-width: 34ch; color: rgba(247,245,240,0.6); font-size: 0.96rem; }
.footer-col h4 {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--brass); font-weight: 500; margin-bottom: 1.1rem;
}
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 0.7rem; }
.footer-col a { color: rgba(247,245,240,0.72); font-size: 0.96rem; transition: color .15s ease; }
.footer-col a:hover { color: var(--alabaster); }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
  padding-top: 1.6rem; flex-wrap: wrap;
  font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.04em;
  color: rgba(247,245,240,0.45);
}
@media (max-width: 720px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 2rem; }
  .footer-brand { grid-column: 1 / -1; }
}

/* ============================================================
   Generic page header (sub-pages)
   ============================================================ */
.page-head { padding-block: clamp(3.5rem, 7vw, 6rem) clamp(2rem, 4vw, 3rem); }
.page-head h1 { font-size: clamp(2.6rem, 6vw, 4.4rem); }
.page-head .lead {
  margin-top: 1.3rem; max-width: 56ch; font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--ink-soft);
}

/* ============================================================
   Reusable surfaces
   ============================================================ */
.card {
  background: var(--alabaster);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  padding: clamp(1.6rem, 3vw, 2.4rem);
}
.divider { border: 0; border-top: 1px solid var(--line); }

/* ---------- Reveal on scroll ---------- */
[data-reveal] {
  opacity: 0; transform: translateY(22px);
  transition: opacity .7s cubic-bezier(.2,.7,.2,1), transform .7s cubic-bezier(.2,.7,.2,1);
}
[data-reveal].is-in { opacity: 1; transform: none; }
[data-reveal][data-delay="1"] { transition-delay: .08s; }
[data-reveal][data-delay="2"] { transition-delay: .16s; }
[data-reveal][data-delay="3"] { transition-delay: .24s; }

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}