/* ═══════════════════════════════════════════════════
   KARDASHEV INSTITUTE — system.css
   Spatial design system. Montserrat. Dark ground.
   ═══════════════════════════════════════════════════ */

/* ── Tokens ── */
:root {
  --void:      #000000;
  --deep:      #0a0a0c;
  --umbra:     #141418;
  --shadow:    #232328;
  --penumbra:  #3a3a42;
  --regolith:  #ffffff;
  --ash:       #c8c8d0;
  --moonstone: #e8e8ec;
  --albedo:    #ffffff;
  --warm:      #d4b896;

  --green:     #2a9460;
  --green-dim: #1d6b44;

  --transition: 0.18s ease;
  --radius:     3px;
  --radius-lg:  6px;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }

body {
  background: var(--void);
  color: var(--ash);
  font-family: 'Montserrat', system-ui, sans-serif;
  font-weight: 400;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  transition: opacity 0.5s ease;
}

body.fade-out {
  opacity: 0;
}

/* ── Canvas starfield ── */
#starfield {
  display: block;
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background: transparent;
}

/* ── Layout wrapper ── */
.site-wrapper { position: relative; z-index: 1; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.container-narrow {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ── Navigation ── */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 2rem;
  background: transparent;
  transition: background var(--transition), border-bottom var(--transition);
}

.site-nav.scrolled {
  background: rgba(0,0,0,0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--shadow);
}

.nav-mark {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--albedo);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-mark-symbol {
  width: 24px;
  height: 28px;
  padding: 0;
  border: 1px solid rgba(255,255,255,0.35);
  border-radius: 6px;
  display: inline-flex; align-items: center; justify-content: center;
  text-align: center;
  line-height: 28px;
  font-size: 0.78rem;
  font-weight: 500;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2.25rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--regolith);
  text-decoration: none;
  transition: color var(--transition);
}

.nav-links a:hover,
.nav-links a.active { color: var(--albedo); }

.nav-cta {
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--void) !important;
  background: var(--warm);
  padding: 0.45rem 1rem;
  border-radius: var(--radius);
  text-decoration: none;
  transition: background var(--transition), color var(--transition);
}

.nav-cta:hover { background: var(--albedo) !important; color: var(--void) !important; }

/* ── Mobile menu ── */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-hamburger span {
  display: block;
  width: 22px; height: 1px;
  background: var(--ash);
  transition: all var(--transition);
}

@media (max-width: 768px) {
  .nav-hamburger { display: flex; }
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    inset: 0;
    background: var(--deep);
    z-index: 200;
    align-items: center;
    justify-content: center;
    gap: 2.5rem;
  }
  .nav-links.open a { font-size: 1rem; }
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: 'Montserrat', sans-serif;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  border: none;
  cursor: pointer;
  padding: 0.8rem 1.75rem;
  border-radius: var(--radius);
  transition: all var(--transition);
}

.btn-primary {
  background: var(--albedo);
  color: var(--void);
}

.btn-primary:hover { background: var(--moonstone); }

.btn-warm {
  background: var(--warm);
  color: var(--void);
}

.btn-warm:hover { background: var(--albedo); }

.btn-outline {
  background: transparent;
  color: var(--ash);
  border: 1px solid var(--shadow);
}

.btn-outline:hover { border-color: var(--penumbra); color: var(--albedo); }

/* ── Section headings ── */
.section-label {
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--regolith);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 300;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--albedo);
  line-height: 1.15;
  margin-bottom: 1.25rem;
}

.section-body {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--regolith);
  line-height: 1.85;
  max-width: 52ch;
}

/* ── Cards ── */
.card {
  background: var(--deep);
  border: 1px solid var(--shadow);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: border-color var(--transition);
}

.card:hover { border-color: var(--penumbra); }

.card-label {
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--regolith);
  margin-bottom: 0.6rem;
}

.card-title {
  font-size: 1rem;
  font-weight: 300;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--albedo);
  margin-bottom: 0.75rem;
}

.card-body {
  font-size: 0.83rem;
  color: var(--regolith);
  line-height: 1.75;
}

/* ── Rule / divider ── */
.rule {
  border: none;
  border-top: 1px solid var(--shadow);
  margin: 3rem 0;
}

/* ── Footer ── */
.site-footer {
  border-top: 1px solid var(--shadow);
  padding: 3rem 2rem 2.5rem;
  margin-top: 6rem;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 3rem;
}

@media (max-width: 640px) {
  .footer-inner { grid-template-columns: 1fr; gap: 2rem; }
}

.footer-col-title {
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ash);
  margin-bottom: 1rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-links a {
  font-size: 0.78rem;
  color: var(--regolith);
  text-decoration: none;
  transition: color var(--transition);
}

.footer-links a:hover { color: var(--ash); }

.footer-legal {
  border-top: 1px solid var(--shadow);
  padding-top: 1.5rem;
  margin-top: 2.5rem;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  font-size: 0.7rem;
  color: var(--penumbra);
  line-height: 1.7;
}

/* ── Scroll reveal ── */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Page hero ── */
.page-hero {
  padding: 10rem 2rem 5rem;
}

.hero-label {
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--warm);
  margin-bottom: 1.25rem;
}

.hero-title {
  font-size: clamp(2.4rem, 6vw, 5rem);
  font-weight: 300;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--albedo);
  line-height: 1.05;
  margin-bottom: 1.5rem;
}

.hero-body {
  font-size: 1rem;
  color: var(--regolith);
  line-height: 1.85;
  max-width: 56ch;
}

/* ── Grid layouts ── */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

@media (max-width: 900px) { .grid-3 { grid-template-columns: 1fr 1fr; } }
@media (max-width: 640px) { .grid-3, .grid-2 { grid-template-columns: 1fr; } }

/* ── Scorecard CTA band ── */
.scorecard-band {
  background: var(--deep);
  border-top: 1px solid var(--shadow);
  border-bottom: 1px solid var(--shadow);
  padding: 3.5rem 2rem;
  text-align: center;
}

.scorecard-band-label {
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--warm);
  margin-bottom: 0.75rem;
}

.scorecard-band-title {
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  font-weight: 300;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--albedo);
  margin-bottom: 0.75rem;
}

.scorecard-band-body {
  font-size: 0.85rem;
  color: var(--regolith);
  max-width: 52ch;
  margin: 0 auto 2rem;
  line-height: 1.75;
}