:root {
  --bg-primary: #111111;
  --bg-secondary: #1a1a1a;
  --text-primary: #e5e5e5;
  --text-secondary: #707070;
  --border: #222222;
  --nav-height: 60px;
}

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

html, body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'IBM Plex Sans', system-ui, sans-serif;
  font-weight: 300;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; text-decoration: none; }

/* ---------- NAV ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  padding: 0 40px;
  background: var(--bg-primary);
  border-bottom: 1px solid #1a1a1a;
}

.nav__brand {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--text-primary);
}

.nav__links { display: flex; gap: 36px; }

.nav__links a {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-primary);
  transition: opacity 120ms linear, color 120ms linear;
}

.nav__links a:hover { opacity: 0.7; }

.nav__links a.is-muted { color: var(--text-secondary); }
.nav__links a.is-muted:hover { color: var(--text-primary); opacity: 1; }

.nav__toggle {
  display: none;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
  width: 24px;
  height: 16px;
  position: relative;
}

.nav__toggle span {
  display: block;
  position: absolute;
  left: 0; right: 0;
  height: 1px;
  background: var(--text-primary);
}

.nav__toggle span:nth-child(1) { top: 4px; }
.nav__toggle span:nth-child(2) { top: 11px; }

/* ---------- MOBILE OVERLAY ---------- */
.mobile-menu {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  z-index: 9;
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding: 0 40px;
  gap: 32px;
}

.mobile-menu.is-open { display: flex; }

.mobile-menu a {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-primary);
  transition: opacity 120ms linear;
}

.mobile-menu a:hover { opacity: 0.7; }
.mobile-menu a.is-muted { color: var(--text-secondary); }

/* ---------- FOOTER ---------- */
.footer {
  border-top: 1px solid #1a1a1a;
  padding: 24px 40px;
  text-align: center;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  color: #444444;
  letter-spacing: 1px;
}

/* ---------- RESPONSIVE ---------- */
@media (max-width: 720px) {
  .nav { padding: 0 24px; }
  .nav__links { display: none; }
  .nav__toggle { display: block; }
  .footer { padding: 24px; }
}