/* ============ VARIABLES ============ */
:root {
  --paper: #f6f1eb;
  --paper-dark: #ede6dc;
  --ink: #1a1615;
  --ink-light: #3d3633;
  --ink-dim: #7a706a;
  --ink-faint: #b0a79f;
  --red: #c4423a;
  --red-light: #d9605a;
  --cream: #faf7f3;
  --rule: #d1c9c0;
  --rule-dark: #a89e95;
  --code-bg: #1a1615;
  --code-fg: #f6f1eb;
  --code-green: #7ec87e;
  --code-amber: #e0b44a;
}

/* ============ RESET ============ */
* { margin: 0; padding: 0; box-sizing: border-box; min-width: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: 'Source Serif 4', Georgia, serif;
  background: var(--paper);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Paper texture */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  opacity: 0.3;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 512 512' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='5' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.08'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 9999;
}

::selection { background: var(--red); color: white; }

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 32px;
}

/* ============ NAV ============ */
nav {
  padding: 20px 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--rule);
}

.nav-brand {
  font-family: 'DM Mono', monospace;
  font-size: 20px;
  font-weight: 500;
  text-decoration: none;
  color: var(--ink);
  letter-spacing: -0.5px;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-right a {
  font-family: 'DM Mono', monospace;
  font-size: 12px;
  color: var(--ink-dim);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  transition: color 0.2s;
}
.nav-right a:hover { color: var(--red); }
.nav-right a.active { color: var(--red); }

.nav-gh {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--ink);
  color: var(--paper) !important;
  border-radius: 4px;
  font-size: 11px !important;
  letter-spacing: 1px !important;
  transition: background 0.2s !important;
}
.nav-gh:hover { background: var(--red) !important; color: white !important; }

/* ============ HAMBURGER BUTTON ============ */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
  order: 2;
  margin-left: auto;
}
.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--ink);
  border-radius: 1px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}
.hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger.active span:nth-child(2) {
  opacity: 0;
}
.hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ============ MOBILE MENU OVERLAY ============ */
.mobile-menu {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 0;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--paper);
  z-index: 1000;
  padding: 80px 32px 32px;
  overflow-y: auto;
}
.mobile-menu.open {
  display: flex;
}
.mobile-menu-link {
  font-family: 'DM Mono', monospace;
  font-size: 14px;
  color: var(--ink-dim);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  padding: 16px 0;
  border-bottom: 1px solid var(--rule);
  width: 100%;
  text-align: center;
  transition: color 0.2s;
}
.mobile-menu-link:hover { color: var(--red); }
.mobile-menu-link.nav-gh {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 6px;
  margin-top: 24px;
  padding: 12px 24px;
  background: var(--ink);
  color: var(--paper);
  border-radius: 4px;
  border-bottom: none;
  width: auto;
  font-size: 11px;
}
.mobile-menu-link.nav-gh:hover { background: var(--red); color: white; }

/* ============ FOOTER ============ */
footer {
  padding: 28px 32px;
  border-top: 1px solid var(--rule);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--ink-faint);
}
footer a { color: var(--ink-dim); text-decoration: none; }
footer a:hover { color: var(--red); }

/* ============ ANIMATIONS ============ */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ============ RESPONSIVE (shared) ============ */
@media (max-width: 768px) {
  nav { flex-wrap: wrap; gap: 12px; padding: 16px; }
  .nav-right { display: none; }
  .hamburger { display: flex; }
  footer { flex-direction: column; gap: 8px; text-align: center; padding: 20px 16px; }
}