/* RSF ↔ Campus Map bridge bar — keeps map identity while linking ecosystems */
:root {
  --rsf-bridge-h: 52px;
  --rsf-bg: #121212;
  --rsf-panel: #1a1a1a;
  --rsf-accent: #ff0000;
  --rsf-accent-b: #ff5a5a;
  --rsf-text: #ffffff;
  --rsf-muted: rgba(255, 255, 255, 0.65);
  --rsf-border: rgba(255, 255, 255, 0.1);
  --rsf-ease: cubic-bezier(0.22, 1, 0.36, 1);
}

body.rsf-bridge-active {
  padding-top: var(--rsf-bridge-h);
}

body.rsf-bridge-active .app {
  min-height: calc(100dvh - var(--rsf-bridge-h));
  height: calc(100% - var(--rsf-bridge-h));
}

.rsf-bridge-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10000;
  height: var(--rsf-bridge-h);
  background: rgba(18, 18, 18, 0.92);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--rsf-border);
  font-family: "Poppins", "DM Sans", system-ui, sans-serif;
}

.rsf-bridge-inner {
  max-width: 1400px;
  margin: 0 auto;
  height: 100%;
  padding: 0 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.rsf-bridge-brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--rsf-text);
  font-weight: 600;
  font-size: 0.92rem;
  letter-spacing: 0.01em;
}

.rsf-bridge-logo {
  width: 28px;
  height: 28px;
  object-fit: contain;
  border-radius: 6px;
}

.rsf-bridge-back {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.95rem;
  border-radius: 999px;
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, #ff0000 0%, #cc0000 100%);
  box-shadow: 0 8px 20px rgba(255, 0, 0, 0.28);
  transition: transform 0.3s var(--rsf-ease), box-shadow 0.3s ease;
}

.rsf-bridge-back:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 28px rgba(255, 0, 0, 0.4);
}

/* Soft page enter */
body.rsf-bridge-active {
  animation: rsfPageIn 0.45s var(--rsf-ease);
}

@keyframes rsfPageIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@media (max-width: 560px) {
  .rsf-bridge-brand span {
    font-size: 0.8rem;
  }

  .rsf-bridge-back {
    padding: 0.5rem 0.8rem;
    font-size: 0.75rem;
  }
}