/* ── VARIABLES ── */
:root {
  --charcoal: #1B2535;
  --charcoal-mid: #243040;
  --slate: #334E68;
  --amber: #E09B2D;
  --amber-dark: #C07818;
  --amber-light: #F5C46A;
  --forest: #2A7A5E;
  --forest-light: #3A9A76;
  --linen: #F5F1EB;
  --linen-dark: #EDE8E0;
  --linen-border: #DDD9D0;
  --mid-gray: #6B7A8D;
  --byline-color: #6B8A9A;
  --light-on-dark: #A8BDD0;
  --light-on-dark-muted: rgba(168,189,208,0.5);
  --hairline-on-dark: rgba(255,255,255,0.06);
  --body-text: #2C3E50;
  --mono: 'Courier New', Courier, monospace;
  --serif: Georgia, 'Times New Roman', serif;
  --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  color: var(--body-text);
  background: #fff;
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

/* ── NAV ── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--charcoal);
  border-bottom: 1px solid var(--hairline-on-dark);
  padding: 0 40px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-mark {
  font-family: var(--mono);
  font-size: 20px;
  font-weight: 600;
  color: var(--linen);
  letter-spacing: -0.5px;
  text-decoration: none;
}

.nav-mark .b { color: var(--amber); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 13px;
  color: var(--light-on-dark);
  text-decoration: none;
  transition: color 0.15s;
}

.nav-links a:hover { color: var(--linen); }

.nav-links a.active { color: var(--amber); }

.btn-nav {
  font-size: 13px;
  font-weight: 600;
  background: var(--amber);
  padding: 8px 20px;
  border-radius: 4px;
  text-decoration: none;
  transition: background 0.15s;
}

/* Specificity must beat .nav-links a (0,1,1) to override its color */
.nav-links a.btn-nav { color: var(--charcoal); }

.btn-nav:hover { background: var(--amber-light); }

/* ── BUTTONS ── */
.btn-primary {
  display: inline-block;
  font-size: 15px;
  font-weight: 600;
  background: var(--amber);
  color: var(--charcoal);
  padding: 14px 28px;
  border-radius: 4px;
  text-decoration: none;
  transition: background 0.15s, transform 0.1s;
}

.btn-primary:hover { background: var(--amber-light); transform: translateY(-1px); }

/* ── FOOTER ── */
footer {
  background: var(--charcoal);
  padding: 40px;
  border-top: 1px solid var(--hairline-on-dark);
}

.footer-inner {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-mark {
  font-family: var(--mono);
  font-size: 18px;
  font-weight: 600;
  color: var(--linen);
  letter-spacing: -0.5px;
  text-decoration: none;
}

.footer-mark .b { color: var(--amber); }

.footer-links {
  display: flex;
  gap: 28px;
  list-style: none;
}

.footer-links a {
  font-size: 13px;
  color: var(--light-on-dark);
  text-decoration: none;
  transition: color 0.15s;
}

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

.footer-copy {
  font-size: 12px;
  color: var(--light-on-dark-muted);
  font-family: var(--mono);
}

/* ── RESPONSIVE (shared nav + footer) ── */
@media (max-width: 700px) {
  nav { padding: 0 20px; }
  .nav-links { display: none; }
  footer { padding: 32px 20px; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}