:root {
  --bg: #05080c;
  --panel: rgba(10, 22, 30, 0.82);
  --panel-border: rgba(68, 207, 166, 0.28);
  --text: #dff8f3;
  --muted: #8fb3b0;
  --accent: #2de6ac;
  --accent2: #3aa1ff;
  --danger: #ff5a8b;
  --warn: #ffd76a;
  --shadow: 0 0 24px rgba(45, 230, 172, 0.12);
  --glass: rgba(12, 28, 40, 0.65);
  --font-display: "Space Grotesk", "Inter", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: "Inter", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
}

.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  padding: 0 24px;
  background: linear-gradient(180deg, rgba(5,8,12,0.95), rgba(5,8,12,0.7));
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--panel-border);
  box-shadow: 0 4px 24px rgba(0,0,0,0.4);
}
.brand { display: flex; align-items: center; gap: 12px; }
.logo {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  color: var(--accent);
  font-size: 24px;
  text-shadow: 0 0 12px var(--accent);
}
.brand h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text);
}

.tabs { display: flex; gap: 8px; }
.tab {
  position: relative;
  padding: 8px 18px;
  border: 1px solid transparent;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}
.tab:hover { color: var(--text); background: rgba(255,255,255,0.06); }
.tab.active {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(45, 230, 172, 0.08);
  box-shadow: 0 0 16px rgba(45, 230, 172, 0.12);
}

main {
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  bottom: 0;
  overflow: hidden;
}

.tab-panel {
  position: absolute;
  inset: 0;
  display: none;
  opacity: 0;
  transition: opacity 0.35s ease;
}
.tab-panel.active { display: block; opacity: 1; }

.stage {
  position: relative;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 50% 50%, #0a1a24 0%, #05080c 70%);
}
#cell-canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.labels-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 5;
  overflow: hidden;
}
.organelle-label {
  position: absolute;
  transform: translate(-50%, -50%);
  padding: 4px 10px;
  border-radius: 6px;
  background: rgba(8, 20, 28, 0.78);
  border: 1px solid var(--panel-border);
  color: var(--text);
  font-size: 0.78rem;
  white-space: nowrap;
  pointer-events: auto;
  cursor: pointer;
  transition: opacity 0.2s, box-shadow 0.2s, transform 0.2s;
  box-shadow: 0 0 10px rgba(45, 230, 172, 0.08);
}
.organelle-label:hover, .organelle-label.active {
  border-color: var(--accent);
  box-shadow: 0 0 16px rgba(45, 230, 172, 0.25);
  color: var(--accent);
}
.organelle-label.hidden-label { opacity: 0.35; }
.organelle-label::after {
  content: '';
  position: absolute;
  top: 50%;
  left: -14px;
  width: 12px;
  height: 1px;
  background: var(--accent);
  opacity: 0.7;
}

.panel {
  position: absolute;
  top: 18px;
  width: min(340px, 28vw);
  max-height: calc(100% - 120px);
  overflow-y: auto;
  padding: 18px;
  border-radius: 16px;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
  z-index: 20;
  transition: transform 0.3s ease, opacity 0.3s ease;
}
.panel-left { left: 18px; }
.panel-right { right: 18px; }
.panel h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.03em;
}

.dossier-row {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.dossier-row .label {
  font-size: 0.72rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.dossier-row .value { font-size: 0.88rem; }
.italic { font-style: italic; color: #b0e6d8; }

.stat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 14px;
}
.stat-chip {
  padding: 10px;
  border-radius: 10px;
  background: rgba(45, 230, 172, 0.06);
  border: 1px solid rgba(45, 230, 172, 0.12);
}
.stat-val { display: block; font-family: var(--font-display); font-size: 0.95rem; color: var(--accent); }
.stat-label { display: block; font-size: 0.7rem; color: var(--muted); margin-top: 2px; }

.organelle-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.organelle-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 10px;
  border-radius: 8px;
  background: rgba(255,255,255,0.04);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  font-size: 0.85rem;
}
.organelle-item:hover { background: rgba(45, 230, 172, 0.1); color: var(--accent); }
.organelle-item.active { background: rgba(45, 230, 172, 0.18); color: var(--accent); border: 1px solid var(--panel-border); }
.organelle-swatch {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  box-shadow: 0 0 6px currentColor;
}

.organelle-card {
  margin-top: 14px;
  padding: 14px;
  border-radius: 12px;
  background: rgba(8, 20, 28, 0.8);
  border: 1px solid var(--panel-border);
}
.organelle-card h3 { margin: 0 0 8px; font-family: var(--font-display); color: var(--accent); }
.organelle-card p { margin: 0 0 10px; font-size: 0.84rem; color: #c8e6e0; }
.card-stats { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 10px; }
.card-stat {
  padding: 4px 8px;
  border-radius: 6px;
  background: rgba(58, 161, 255, 0.08);
  border: 1px solid rgba(58, 161, 255, 0.16);
  font-size: 0.72rem;
  color: var(--accent2);
}

.stage-controls {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  padding: 10px 16px;
  border-radius: 999px;
  background: var(--glass);
  border: 1px solid var(--panel-border);
  backdrop-filter: blur(10px);
  z-index: 25;
  box-shadow: 0 8px 32px rgba(0,0,0,0.35);
}
.ctrl-btn, .tonic-btn {
  padding: 9px 16px;
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  background: rgba(45, 230, 172, 0.06);
  color: var(--text);
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}
.ctrl-btn:hover, .tonic-btn:hover { background: rgba(45, 230, 172, 0.14); border-color: var(--accent); }
.ctrl-btn.active, .tonic-btn.active { background: rgba(45, 230, 172, 0.22); color: var(--accent); border-color: var(--accent); box-shadow: 0 0 16px rgba(45, 230, 172, 0.12); }

.zoom-hint {
  position: absolute;
  bottom: 88px;
  left: 50%;
  transform: translateX(-50%);
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(0,0,0,0.45);
  color: var(--muted);
  font-size: 0.74rem;
  pointer-events: none;
  opacity: 0.7;
}

.mobile-toggle {
  display: none;
  position: absolute;
  top: 18px;
  right: 18px;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--glass);
  border: 1px solid var(--panel-border);
  color: var(--accent);
  font-size: 1.2rem;
  z-index: 30;
}

.loader {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 18px;
  background: var(--bg);
  z-index: 200;
  transition: opacity 0.4s ease;
}
.loader.hidden { opacity: 0; pointer-events: none; }
.loader-ring {
  width: 48px;
  height: 48px;
  border: 3px solid rgba(45, 230, 172, 0.2);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Tabs: Processes */
.processes-shell, .experiments-shell {
  width: 100%;
  height: 100%;
  padding: 24px 32px 40px;
  overflow-y: auto;
  background: radial-gradient(circle at 30% 20%, #0a1f2a 0%, #05080c 60%);
}
.process-intro, .exp-card > h2, .exp-card > p { max-width: 960px; margin: 0 auto; }
.process-intro h2, .exp-card h2 { font-family: var(--font-display); color: var(--accent); margin-bottom: 8px; }
.process-intro p, .exp-card > p { color: var(--muted); margin-bottom: 18px; }
.process-stage {
  position: relative;
  max-width: 960px;
  margin: 0 auto 18px;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--panel-border);
  box-shadow: var(--shadow);
  background: rgba(8,20,28,0.6);
}
#process-canvas { display: block; width: 100%; height: auto; }
.process-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 14px 18px;
  background: rgba(5,8,12,0.78);
  backdrop-filter: blur(8px);
  border-top: 1px solid var(--panel-border);
  color: var(--text);
  font-size: 0.9rem;
}
.process-controls {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.step-bar {
  flex: 1;
  min-width: 140px;
  height: 6px;
  background: rgba(255,255,255,0.08);
  border-radius: 3px;
  overflow: hidden;
}
.step-progress { height: 100%; width: 0%; background: linear-gradient(90deg, var(--accent2), var(--accent)); transition: width 0.3s ease; }

/* Tabs: Experiments */
.experiments-shell {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.exp-card {
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: 22px;
  border-radius: 18px;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  box-shadow: var(--shadow);
}
.sliders { display: flex; flex-direction: column; gap: 16px; margin: 20px 0; }
.slider-row {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.slider-row label { width: 140px; font-size: 0.9rem; color: var(--muted); }
.slider-row input[type="range"] { flex: 1; min-width: 180px; accent-color: var(--accent); }
.slider-val { min-width: 44px; font-family: var(--font-display); color: var(--accent); }

.readout {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 14px;
  margin: 20px 0;
}
.readout-item {
  padding: 14px;
  border-radius: 12px;
  background: rgba(45, 230, 172, 0.06);
  border: 1px solid rgba(45, 230, 172, 0.14);
  text-align: center;
}
.readout-val { display: block; font-family: var(--font-display); font-size: 1.6rem; color: var(--accent); }
.readout-label { display: block; font-size: 0.74rem; color: var(--muted); margin-top: 4px; }
.equation {
  text-align: center;
  font-size: 1.05rem;
  color: #b0e6d8;
  margin: 14px 0;
  letter-spacing: 0.02em;
}
#exp-photosyn-canvas { display: block; width: 100%; height: auto; margin-top: 16px; border-radius: 10px; background: rgba(0,0,0,0.25); }

.tonicity-buttons { display: flex; gap: 10px; margin: 16px 0; }
.tonicity-readout {
  padding: 14px;
  border-radius: 10px;
  background: rgba(8,20,28,0.7);
  border: 1px solid var(--panel-border);
  font-size: 0.88rem;
  color: #c8e6e0;
  margin-bottom: 16px;
}
.tonicity-preview svg { width: 100%; max-width: 420px; display: block; margin: 0 auto; }
.tonicity-preview .wall { fill: none; stroke: #2de6ac; stroke-width: 4; opacity: 0.55; }
.tonicity-preview .membrane { fill: rgba(58,161,255,0.25); stroke: #3aa1ff; stroke-width: 2; transition: all 0.8s ease; }
.tonicity-preview .vacuole { fill: rgba(45,230,172,0.28); stroke: #2de6ac; stroke-width: 1.5; transition: all 0.8s ease; }
.preview-label { fill: var(--muted); font-size: 11px; font-family: var(--font-display); }

/* Scrollbars */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(45,230,172,0.2); border-radius: 3px; }

/* Mobile */
@media (max-width: 900px) {
  .topbar { height: 56px; padding: 0 14px; }
  .brand h1 { font-size: 1.1rem; }
  .tab { padding: 6px 12px; font-size: 0.82rem; }
  main { top: 56px; }
  .panel { position: fixed; top: auto; bottom: 0; left: 0; right: 0; width: 100%; max-height: 42vh; border-radius: 18px 18px 0 0; transform: translateY(100%); }
  .panel.open { transform: translateY(0); }
  .panel-left { top: auto; }
  .panel-right { top: auto; }
  .stage-controls { bottom: 16px; gap: 6px; padding: 8px; }
  .ctrl-btn { padding: 7px 12px; font-size: 0.75rem; }
  .zoom-hint { bottom: 74px; font-size: 0.65rem; }
  .mobile-toggle { display: grid; place-items: center; }
}

@media (max-width: 640px) {
  .tabs { gap: 4px; }
  .tab { padding: 5px 10px; font-size: 0.75rem; }
  .processes-shell, .experiments-shell { padding: 16px; }
  .exp-card { padding: 16px; }
  .readout { grid-template-columns: 1fr; }
}