:root {
  --navy: #0E1826;
  --navy-2: #13202F;
  --navy-3: #192840;
  --navy-4: #1E3050;
  --gold: #B8962E;
  --gold-lt: #CFA84A;
  --gold-pale: #EDE0BE;
  --smoke: #8A95A8;
  --mist: #C4CBDA;
  --white: #F8F5EF;
  --serif: 'Cormorant Garamond', Georgia, serif;
  --sans: 'DM Sans', system-ui, sans-serif;
  --mono: 'DM Mono', monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background: var(--navy);
  color: var(--white);
  font-family: var(--sans);
  font-weight: 300;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ── noise ── */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("../assets/noise.png");
  opacity: .025;
  pointer-events: none;
  z-index: 999;
}

/* ── scrollbar ── */
::-webkit-scrollbar {
  width: 3px;
}

::-webkit-scrollbar-track {
  background: var(--navy);
}

::-webkit-scrollbar-thumb {
  background: rgba(184, 150, 46, .3);
  border-radius: 2px;
}

::selection {
  background: rgba(184, 150, 46, .2);
}

/* ── nav ── */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 24px 64px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all .3s;
  border-bottom: 1px solid transparent;
}

nav.stuck {
  padding: 14px 64px;
  background: rgba(14, 24, 38, .96);
  backdrop-filter: blur(16px);
  border-bottom-color: rgba(184, 150, 46, .12);
}

.nav-mark {
  font-family: var(--serif);
  font-size: 1.14rem;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--gold);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 36px;
  list-style: none;
}

.nav-links a {
  font-size: .67rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--smoke);
  text-decoration: none;
  transition: color .2s;
}

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

.mobile-toggle {
  display: none;
  color: var(--gold);
  cursor: pointer;
}

/* ── footer ── */
footer {
  padding: 64px 64px 80px;
  background: var(--navy);
  border-top: 1px solid var(--navy-4);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.f-logo {
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--white);
  letter-spacing: 0.02em;
}

.f-corp {
  font-size: 0.7rem;
  color: var(--smoke);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.f-conf {
  font-size: 0.7rem;
  color: rgba(138, 149, 168, 0.4);
}

@media (max-width: 900px) {
  nav, nav.stuck {
    padding: 18px 28px;
  }
  .mobile-toggle {
    display: block;
  }
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(13, 13, 20, 0.98);
    backdrop-filter: blur(16px);
    flex-direction: column;
    padding: 32px 24px;
    align-items: center;
    gap: 24px;
    border-bottom: 1px solid rgba(184, 150, 46, 0.1);
  }
  .nav-links.open {
    display: flex;
  }
  footer {
    flex-direction: column;
    gap: 32px;
    padding: 48px 24px;
    text-align: center;
  }
  .f-corp, .f-conf {
    text-align: center;
  }
}

/* ── back to top ── */
#backToTop {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  background: var(--gold);
  color: var(--navy);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  cursor: pointer;
  z-index: 90;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.3s;
  border: none;
  font-size: 20px;
}

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