:root {
  --bg-0: #050816;
  --bg-1: #0a0e1f;
  --bg-2: #14182e;
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --text-muted: #64748b;
  --accent: #34d399;
  --accent-glow: rgba(52, 211, 153, 0.45);
  --panel-bg: rgba(255, 255, 255, 0.03);
  --panel-border: rgba(255, 255, 255, 0.09);
}

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

html, body { height: 100%; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg-0);
  color: var(--text);
  min-height: 100vh;
  position: relative;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.bg-glow {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(ellipse 900px 700px at 20% 25%, rgba(99, 102, 241, 0.20), transparent 60%),
    radial-gradient(ellipse 800px 600px at 80% 75%, rgba(52, 211, 153, 0.14), transparent 60%),
    radial-gradient(ellipse 700px 500px at 50% 100%, rgba(236, 72, 153, 0.10), transparent 60%),
    linear-gradient(135deg, var(--bg-0), var(--bg-1));
}

/* ============ HEADER ============ */
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.4rem 2.5rem;
  border-bottom: 1px solid var(--panel-border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
}

.brand-mark {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #5eead4, #6366f1 60%, #1e1b4b);
  box-shadow: 0 0 24px rgba(94, 234, 212, 0.45), inset 0 0 8px rgba(255, 255, 255, 0.2);
  position: relative;
}

.brand-mark::after {
  content: "";
  position: absolute;
  inset: 7px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(167, 139, 250, 0.85), transparent 70%);
}

.brand-name {
  font-size: 1.1rem;
  letter-spacing: 0.02em;
  background: linear-gradient(135deg, #fff, #94a3b8);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.nav-tag {
  font-size: 0.82rem;
  color: var(--text-dim);
  padding: 0.4rem 0.95rem;
  border: 1px solid var(--panel-border);
  border-radius: 100px;
  background: var(--panel-bg);
  backdrop-filter: blur(10px);
  letter-spacing: 0.02em;
}

/* ============ LAYOUT ============ */
.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 380px;
  gap: 2.5rem;
  padding: 2rem 2.5rem 3rem;
  max-width: 1800px;
  margin: 0 auto;
  align-items: start;
}

.cell-stage {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  min-width: 0;
}

.stage-header h1 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(1.8rem, 3.2vw, 2.6rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #fff 0%, #c4b5fd 50%, #5eead4 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1.1;
}

.stage-header p {
  margin-top: 0.6rem;
  color: var(--text-dim);
  font-size: 0.95rem;
}

.cell-svg {
  width: 100%;
  height: auto;
  max-height: 78vh;
  display: block;
  filter: drop-shadow(0 30px 80px rgba(99, 102, 241, 0.25));
}

/* ============ ORGANELLES ============ */
.organelle {
  cursor: pointer;
  transition: filter 0.3s ease;
}

.organelle > path,
.organelle > circle,
.organelle > ellipse,
.organelle > rect,
.organelle > g {
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), filter 0.3s ease;
  transform-origin: center;
  transform-box: fill-box;
}

.organelle:hover {
  filter: brightness(1.18) saturate(1.15);
}

/* SELECTAT — glow puternic + contur verde + pulsare */
.organelle.active {
  filter: brightness(1.4) saturate(1.35)
          drop-shadow(0 0 12px var(--accent-glow))
          drop-shadow(0 0 26px var(--accent-glow))
          drop-shadow(0 0 48px rgba(52, 211, 153, 0.35));
  animation: activePulse 2s ease-in-out infinite;
}

@keyframes activePulse {
  0%, 100% {
    filter: brightness(1.4) saturate(1.35)
            drop-shadow(0 0 12px var(--accent-glow))
            drop-shadow(0 0 26px var(--accent-glow))
            drop-shadow(0 0 48px rgba(52, 211, 153, 0.35));
  }
  50% {
    filter: brightness(1.55) saturate(1.4)
            drop-shadow(0 0 18px var(--accent-glow))
            drop-shadow(0 0 40px var(--accent-glow))
            drop-shadow(0 0 70px rgba(52, 211, 153, 0.45));
  }
}

/* contur verde gros pe formele organitului activ */
.organelle.active path:not(.leader),
.organelle.active circle:not(.leader-dot),
.organelle.active ellipse,
.organelle.active rect {
  stroke: var(--accent) !important;
  stroke-width: 3.2 !important;
}

/* membrana primește contur și mai gros */
.organelle[data-id="membrana"].active .cell-shape {
  stroke: #5eead4 !important;
  stroke-width: 5 !important;
}
.organelle[data-id="membrana"].active .cell-inner {
  stroke: #5eead4 !important;
  stroke-opacity: 0.85 !important;
}

/* ribozomi: punctele devin verzi când e activ */
.organelle[data-id="ribozomi"].active g circle {
  fill: var(--accent) !important;
}

/* labels */
.label {
  font-family: 'Inter', sans-serif;
  font-size: 14px;
  fill: var(--text-dim);
  font-weight: 500;
  pointer-events: auto;
  transition: fill 0.2s ease, font-weight 0.2s ease;
  letter-spacing: 0.01em;
}

.label.sub {
  font-size: 13px;
  fill: var(--text-muted);
}

.organelle:hover .label,
.organelle.active .label {
  fill: var(--text);
  font-weight: 600;
}

.organelle.active .label {
  fill: var(--accent);
}

.leader {
  stroke: rgba(255, 255, 255, 0.22);
  stroke-width: 1;
  stroke-dasharray: 3,4;
  transition: stroke 0.25s ease, stroke-width 0.25s ease, stroke-dasharray 0.25s ease;
}

.organelle:hover .leader {
  stroke: rgba(255, 255, 255, 0.55);
}

.organelle.active .leader {
  stroke: var(--accent);
  stroke-width: 1.4;
  stroke-dasharray: none;
}

.leader-dot {
  fill: rgba(255, 255, 255, 0.4);
  transition: fill 0.25s ease, r 0.25s ease;
}

.organelle:hover .leader-dot {
  fill: rgba(255, 255, 255, 0.85);
}

.organelle.active .leader-dot {
  fill: var(--accent);
  filter: drop-shadow(0 0 6px var(--accent-glow));
}

/* keyboard focus — fără chenar de selecție; doar eticheta se evidențiază */
.organelle,
.organelle * {
  outline: none;
}
.organelle:focus {
  outline: none;
}
.organelle:focus-visible .label {
  fill: var(--accent);
  font-weight: 600;
}

/* ============ INFO PANEL ============ */
.info-panel {
  background: linear-gradient(165deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.015));
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--panel-border);
  border-radius: 24px;
  padding: 2rem;
  position: sticky;
  top: 2rem;
  height: fit-content;
  box-shadow:
    0 30px 80px -20px rgba(0, 0, 0, 0.55),
    inset 0 1px 0 0 rgba(255, 255, 255, 0.06);
  animation: panelIn 0.5s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes panelIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.info-tag {
  display: inline-block;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 0.35rem 0.85rem;
  border-radius: 100px;
  background: rgba(52, 211, 153, 0.10);
  color: var(--accent);
  border: 1px solid rgba(52, 211, 153, 0.22);
  margin-bottom: 1rem;
  font-weight: 500;
  transition: all 0.3s ease;
}

.info-panel h2 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.65rem;
  font-weight: 600;
  margin-bottom: 0.85rem;
  letter-spacing: -0.015em;
  background: linear-gradient(135deg, #fff, #cbd5e1);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.info-panel p {
  color: var(--text-dim);
  line-height: 1.65;
  font-size: 0.93rem;
  margin-bottom: 1.4rem;
}

.facts {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.4rem;
}

.facts li {
  font-size: 0.85rem;
  color: var(--text);
  padding: 0.65rem 0.85rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  display: flex;
  align-items: center;
  gap: 0.7rem;
  transition: background 0.2s ease, transform 0.2s ease;
}

.facts li:hover {
  background: rgba(255, 255, 255, 0.05);
  transform: translateX(2px);
}

.facts li::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
  box-shadow: 0 0 10px var(--accent-glow);
}

.hint {
  padding-top: 1rem;
  border-top: 1px solid var(--panel-border);
  font-size: 0.78rem;
  color: var(--text-muted);
}

kbd {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--panel-border);
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: 1px 7px;
  font-family: ui-monospace, 'SF Mono', monospace;
  font-size: 0.72rem;
  color: var(--text);
}

/* ============ FOOTER ============ */
.site-footer {
  text-align: center;
  padding: 1rem 2rem 2rem;
  color: var(--text-muted);
  font-size: 0.78rem;
}

/* ============ ANIMATIONS ============ */
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-3px); }
}

@keyframes pulse-soft {
  0%, 100% { opacity: 0.7; }
  50% { opacity: 1; }
}

.organelle.active .leader-dot {
  animation: pulse-soft 1.6s ease-in-out infinite;
}

/* fade in panel content when changing */
.fade-swap {
  animation: fadeSwap 0.4s ease both;
}

@keyframes fadeSwap {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============ RESPONSIVE ============ */
@media (max-width: 1100px) {
  .layout {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .info-panel {
    position: static;
  }
}

@media (max-width: 720px) {
  .site-header {
    padding: 1rem 1.25rem;
  }
  .layout {
    padding: 1.25rem 1rem 2rem;
  }
  .info-panel {
    padding: 1.5rem;
    border-radius: 18px;
  }
  .label {
    font-size: 16px;
  }
  .label.sub {
    font-size: 15px;
  }
  .nav-tag {
    display: none;
  }
}