/* ── SHARED DESIGN SYSTEM ── */
@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,400;0,600;1,300;1,400&family=JetBrains+Mono:wght@300;400;600&display=swap');

:root {
  --ink: #0f0e0c;
  --paper: #f4efe6;
  --accent: #b83418;
  --accent2: #2a5fa8;
  --muted: #857b6a;
  --rule: #d5cdbf;
  --bright: #fdfaf4;
  --dark: #1a1714;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: 'Cormorant Garamond', Georgia, serif;
  font-size: 18px;
  line-height: 1.65;
  overflow-x: hidden;
}

/* grain */
body::after {
  content: '';
  position: fixed; inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.025'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 9000;
}

/* ── NAV ── */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 500;
  display: flex; align-items: center; justify-content: space-between;
  padding: 1.2rem 3rem;
  background: rgba(244,239,230,0.93);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
}
.nav-logo {
  font-family: 'JetBrains Mono', monospace;
  font-size: .72rem; font-weight: 600;
  letter-spacing: .18em; text-transform: uppercase;
  color: var(--ink); text-decoration: none;
}
.nav-links { display: flex; gap: 2rem; list-style: none; align-items: center; }
.nav-links a {
  font-family: 'JetBrains Mono', monospace;
  font-size: .65rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--muted); text-decoration: none; transition: color .2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--accent); }

/* ── COMMON LAYOUT ── */
.page-wrap { padding-top: 72px; }

.inner { max-width: 1100px; margin: 0 auto; padding: 0 3rem; }

section { padding: 5rem 0; border-top: 1px solid var(--rule); }
section:first-of-type { border-top: none; }

.sec-eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: .65rem; letter-spacing: .22em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 1.2rem; display: block;
}
.sec-title {
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 300; letter-spacing: -.02em; line-height: 1.05;
}
.sec-title em { font-style: italic; color: var(--accent); }

/* ── BUTTONS ── */
.btn {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: .62rem; letter-spacing: .14em; text-transform: uppercase;
  padding: .65rem 1.4rem;
  text-decoration: none; transition: all .2s; cursor: pointer; border: none;
}
.btn-dark { background: var(--ink); color: var(--paper); }
.btn-dark:hover { background: var(--accent); }
.btn-outline { background: transparent; color: var(--ink); border: 1px solid var(--rule); }
.btn-outline:hover { border-color: var(--ink); }
.btn-sm {
  font-family: 'JetBrains Mono', monospace;
  font-size: .55rem; letter-spacing: .1em; text-transform: uppercase;
  padding: .28rem .65rem; border: 1px solid var(--rule);
  color: var(--muted); text-decoration: none; transition: all .2s;
  white-space: nowrap;
}
.btn-sm:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn-sm.arxiv:hover { background: var(--accent2); border-color: var(--accent2); color: #fff; }

/* ── REVEAL ── */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .65s ease, transform .65s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ── FOOTER ── */
footer {
  background: var(--dark); color: var(--paper);
  border-top: 1px solid rgba(255,255,255,.06);
  padding: 3rem;
  display: flex; justify-content: space-between; align-items: center; gap: 2rem;
  flex-wrap: wrap;
}
.footer-left {
  font-family: 'JetBrains Mono', monospace;
  font-size: .62rem; letter-spacing: .1em;
  color: rgba(255,255,255,.35); line-height: 1.9;
}
.footer-email {
  font-size: 1rem; color: var(--paper);
  text-decoration: none; border-bottom: 1px solid var(--accent); padding-bottom: 2px;
}
.footer-email:hover { color: var(--accent); }

@media (max-width: 768px) {
  nav { padding: 1rem 1.5rem; }
  .nav-links { gap: 1rem; }
  .inner { padding: 0 1.5rem; }
  footer { flex-direction: column; text-align: center; padding: 2rem 1.5rem; }
}