/* ═══════════════════════════════════════════════
   Shared base styles — Annual NRCT Research Team Meeting 2026
   Used by every page (index, presentation_guideline, registration,
   abstract_submission, contact). Page-specific styles stay inline.
   ═══════════════════════════════════════════════ */

:root {
  --primary: #ee478d;
  --secondary: #ff8fab;
  --dark: #0a0e1a;
  --dark2: #111827;
  --glass: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Noto Sans", sans-serif;
  background: var(--dark);
  color: #e2e8f0;
  padding-top: 70px;
  overflow-x: hidden;
}

/* ─── Particles Background (molecules + light) ─── */
#particles-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  overflow: hidden;
  background: linear-gradient(135deg, #0a0e1a 0%, #111827 50%, #0f172a 100%);
}
.molecule {
  position: absolute;
  left: 0;
  top: 0;
  opacity: 0;
  animation: moleculeDrift linear infinite;
  pointer-events: none;
}
.molecule svg {
  display: block;
  width: 100%;
  height: 100%;
  overflow: visible;
}
@keyframes moleculeDrift {
  0% {
    transform: translate(0, 100vh) rotate(0deg) scale(0.6);
    opacity: 0;
  }
  8% {
    opacity: 0.55;
  }
  30% {
    transform: translate(40px, 70vh) rotate(60deg) scale(0.9);
  }
  55% {
    transform: translate(-35px, 45vh) rotate(140deg) scale(1);
  }
  80% {
    transform: translate(30px, 15vh) rotate(220deg) scale(0.85);
    opacity: 0.5;
  }
  100% {
    transform: translate(-10px, -12vh) rotate(300deg) scale(0.6);
    opacity: 0;
  }
}
.photon {
  position: absolute;
  left: 0;
  top: 0;
  border-radius: 50%;
  opacity: 0;
  animation: photonDrift linear infinite;
  pointer-events: none;
}
@keyframes photonDrift {
  0% {
    transform: translate(0, 100vh) scale(0.5);
    opacity: 0;
  }
  10% {
    opacity: 0.7;
  }
  35% {
    transform: translate(-50px, 68vh) scale(1.3);
    opacity: 0.3;
  }
  50% {
    transform: translate(30px, 50vh) scale(0.8);
    opacity: 0.7;
  }
  70% {
    transform: translate(-25px, 28vh) scale(1.2);
    opacity: 0.3;
  }
  90% {
    opacity: 0.6;
  }
  100% {
    transform: translate(20px, -12vh) scale(0.5);
    opacity: 0;
  }
}

/* ─── Navbar ─── */
.navbar {
  background: rgba(10, 14, 26, 0.95) !important;
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(238, 71, 141, 0.3);
  padding: 12px 0;
}
.navbar-brand {
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-size: 1.1rem;
}
.nav-link {
  color: rgba(255, 255, 255, 0.8) !important;
  font-weight: 500;
  transition: color 0.3s;
  font-size: 0.9rem;
}
.nav-link:hover,
.nav-link.active {
  color: var(--primary) !important;
}
.dropdown-menu {
  background: rgba(17, 24, 39, 0.98);
  border: 1px solid rgba(238, 71, 141, 0.2);
  backdrop-filter: blur(20px);
}
.dropdown-item {
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.9rem;
}
.dropdown-item:hover {
  background: rgba(238, 71, 141, 0.15);
  color: var(--primary);
}
.navbar-toggler {
  color: rgba(255, 255, 255, 0.85);
  padding: 6px 10px;
}
.navbar-toggler-icon {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255,255,255,0.85)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}
.navbar-toggler:focus {
  box-shadow: 0 0 0 2px rgba(238, 71, 141, 0.4);
}
@media (max-width: 991px) {
  .navbar-collapse {
    background: rgba(10, 14, 26, 0.98);
    border-top: 1px solid rgba(238, 71, 141, 0.25);
    border-radius: 0 0 16px 16px;
    padding: 12px 8px 16px;
    margin-top: 8px;
  }
  .navbar-nav {
    gap: 4px !important;
  }
  .nav-link {
    padding: 10px 14px !important;
    border-radius: 8px;
  }
  .nav-link:hover {
    background: rgba(238, 71, 141, 0.1);
  }
  .dropdown-menu {
    border: none;
    background: rgba(255, 255, 255, 0.04);
    padding-left: 12px;
  }
}

/* ─── Footer ─── */
footer {
  background: rgba(0, 0, 0, 0.6);
  border-top: 1px solid rgba(238, 71, 141, 0.2);
  text-align: center;
  padding: 28px 20px;
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.9rem;
  margin-top: 80px;
}
footer a {
  color: var(--secondary);
  text-decoration: none;
}
footer a:hover {
  color: var(--primary);
}
footer .footer-name {
  color: rgba(255, 255, 255, 0.85);
  font-weight: 600;
}

/* ─── Divider ─── */
.pink-divider {
  border: none;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(238, 71, 141, 0.4),
    transparent
  );
  margin: 48px 0;
}