/* =============================================
   THE PHYSICAL UNIVERSE — Shared Stylesheet
   Amit Krishnan
   ============================================= */

@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,700;0,900;1,400;1,700&family=Source+Serif+4:ital,opsz,wght@0,8..60,300;0,8..60,400;0,8..60,600;1,8..60,300;1,8..60,400&family=JetBrains+Mono:wght@400;500&display=swap');

/* ---- TOKENS ---- */
:root {
  --ink:     #12100e;
  --paper:   #f4efe6;
  --accent:  #b5271e;
  --accent2: #d4830a;
  --muted:   #6b6155;
  --rule:    #d6ccb8;
  --soft:    #ede8dd;
}

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

/* ---- BASE ---- */
body {
  background: var(--paper);
  color: var(--ink);
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 18px;
  line-height: 1.8;
  font-weight: 300;
  overflow-x: hidden;
}

/* grain overlay */
body::after {
  content: '';
  position: fixed; inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)' opacity='0.035'/%3E%3C/svg%3E");
  pointer-events: none; z-index: 9999; opacity: 0.5;
}

/* ---- SCROLL PROGRESS ---- */
#bar {
  position: fixed; top: 0; left: 0;
  height: 2px; background: var(--accent);
  width: 0%; z-index: 1001;
  transition: width 0.08s linear;
}

/* ---- NAV ---- */
.site-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 48px;
  height: 64px;
  background: rgba(18,16,14,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(244,239,230,0.06);
  transition: background 0.3s;
}

.nav-logo {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--paper);
  text-decoration: none; opacity: 0.7;
  transition: opacity 0.2s;
}
.nav-logo:hover { opacity: 1; }
.nav-logo em { font-style: normal; color: var(--accent); }

.nav-links {
  display: flex; align-items: center; gap: 36px;
  list-style: none;
}
.nav-links a {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9.5px; letter-spacing: 0.18em;
  text-transform: uppercase; color: rgba(244,239,230,0.45);
  text-decoration: none;
  transition: color 0.2s;
}
.nav-links a:hover,
.nav-links a.active { color: var(--paper); }
.nav-links a.active::after {
  content: '';
  display: block;
  width: 100%; height: 1px;
  background: var(--accent);
  margin-top: 2px;
}
.nav-links a.nav-cta.active::after { display: none; }

.nav-cta {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9.5px; letter-spacing: 0.18em;
  text-transform: uppercase;
  padding: 8px 18px;
  border: 1px solid rgba(181,39,30,0.5);
  color: var(--accent) !important;
  text-decoration: none;
  white-space: nowrap;
  transition: all 0.2s !important;
}
.nav-cta:hover { background: var(--accent) !important; color: var(--paper) !important; }

.nav-hamburger {
  display: none;
  flex-direction: column; gap: 5px;
  cursor: pointer; background: none; border: none; padding: 4px;
}
.nav-hamburger span {
  display: block; width: 22px; height: 1px;
  background: rgba(244,239,230,0.6);
  transition: all 0.3s;
}

/* ---- FOOTER ---- */
.site-footer {
  background: var(--ink);
  padding: 80px 48px 48px;
  border-top: 1px solid rgba(244,239,230,0.06);
}

.footer-inner {
  max-width: 960px; margin: 0 auto;
  display: grid; grid-template-columns: 1fr 1fr 1fr;
  gap: 48px;
}

.footer-brand .footer-name {
  font-family: 'Playfair Display', serif;
  font-size: 22px; font-weight: 700;
  color: var(--paper); margin-bottom: 10px;
}
.footer-brand p {
  font-size: 13px; color: rgba(244,239,230,0.35);
  line-height: 1.7; margin: 0;
}

.footer-col-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9px; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--accent);
  margin-bottom: 18px;
}
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul a {
  font-size: 13px; color: rgba(244,239,230,0.4);
  text-decoration: none;
  transition: color 0.2s;
}
.footer-col ul a:hover { color: var(--paper); }

.footer-bottom {
  max-width: 960px; margin: 56px auto 0;
  padding-top: 24px;
  border-top: 1px solid rgba(244,239,230,0.06);
  display: flex; align-items: center; justify-content: space-between;
}
.footer-bottom p {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9px; letter-spacing: 0.14em;
  text-transform: uppercase; color: rgba(244,239,230,0.2);
  margin: 0;
}

/* ---- ANIMATIONS ---- */
@keyframes rise {
  from { opacity: 0; transform: translateY(22px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes appear {
  to { opacity: 1; }
}
@keyframes bob {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(8px); }
}

.fade-up {
  opacity: 0; transform: translateY(28px);
  transition: opacity 0.75s ease, transform 0.75s ease;
}
.fade-up.in { opacity: 1; transform: translateY(0); }

/* ---- UTILITIES ---- */
.mono {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px; letter-spacing: 0.2em; text-transform: uppercase;
}
.tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px; letter-spacing: 0.12em;
  padding: 5px 13px; border: 1px solid var(--rule);
  color: var(--muted); text-transform: uppercase;
  display: inline-block;
  transition: all 0.2s;
}
.tag:hover { border-color: var(--accent); color: var(--accent); }

/* ---- MOBILE NAV ---- */
@media (max-width: 720px) {
  .site-nav { padding: 0 24px; }
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }

  .nav-links.open {
    display: flex; flex-direction: column;
    position: fixed; inset: 64px 0 0 0;
    background: rgba(18,16,14,0.98);
    align-items: center; justify-content: center;
    gap: 32px; z-index: 999;
  }
  .nav-links.open a { font-size: 13px; }

  .footer-inner { grid-template-columns: 1fr; gap: 36px; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
}