*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#F5F3EF;--bg2:#EDEAE4;
  --text:#3A3A3A;--text2:#6A6A6A;--text3:#9A9A9A;
  --accent:#5B6F8A;--accent2:#7A8FA6;
  --stain:#7B5E7B;--stain2:#9A73A8;
  --dna:#6B7F4E;--dna2:#8A9F6B;
  --spindle:#8B7355;--border:#D8D4D0;
  --white:#F5F3EF;
}
html,body{width:100%;height:100%;overflow:hidden;background:var(--bg);color:var(--text);font-family:'Segoe UI','Helvetica Neue',Arial,sans-serif;font-size:15px;line-height:1.6}

#intro{position:fixed;inset:0;z-index:200;display:flex;flex-direction:column;align-items:center;justify-content:center;background:var(--bg);transition:opacity 1s}
#intro-canvas{position:absolute;inset:0;pointer-events:none}
.intro-inner{position:relative;z-index:1;text-align:center;display:flex;flex-direction:column;align-items:center;gap:0.6rem;max-width:600px;padding:2rem}
.pre-title{font-family:'Segoe UI',Arial,sans-serif;font-size:0.8rem;letter-spacing:0.4em;color:var(--accent);text-transform:uppercase;opacity:0;animation:fadeUp 1s 0.4s forwards}
.main-title{font-family:Georgia,'Times New Roman',serif;font-size:clamp(3rem,8vw,6rem);font-weight:700;letter-spacing:0.04em;color:var(--text);opacity:0;animation:fadeUp 1s 0.7s forwards;border-bottom:2px solid var(--border);padding-bottom:0.5rem}
.sub-title{font-family:'Segoe UI',Arial,sans-serif;font-size:0.9rem;letter-spacing:0.1em;color:var(--text3);opacity:0;animation:fadeUp 1s 1s forwards}
.intro-btn{margin-top:2rem;padding:0.7rem 2.2rem;background:var(--accent);border:none;color:white;font-family:'Segoe UI',Arial,sans-serif;font-size:0.8rem;letter-spacing:0.12em;text-transform:uppercase;cursor:pointer;transition:background 0.2s;opacity:0;animation:fadeUp 1s 1.3s forwards}
.intro-btn:hover{background:var(--accent2)}

#app{display:none;flex-direction:column;height:100vh;height:100dvh;position:relative}
#app.on{display:flex}
#bg-canvas{position:fixed;inset:0;z-index:0;pointer-events:none}

#topbar{display:flex;align-items:center;justify-content:space-between;padding:0.7rem 2rem;border-bottom:1px solid var(--border);z-index:10;position:relative;flex-shrink:0;background:var(--white)}
.tb-phase{font-family:Georgia,serif;font-size:1.1rem;font-weight:700;color:var(--text);letter-spacing:0.02em;animation:none}
.tb-logo{font-family:'Segoe UI',Arial,sans-serif;font-size:0.7rem;letter-spacing:0.25em;color:var(--text3);text-transform:uppercase}
.tb-count{font-family:'Segoe UI',Arial,sans-serif;font-size:0.8rem;color:var(--text3)}

#prog{height:2px;background:var(--border);flex-shrink:0;z-index:10;position:relative}
#prog-fill{height:100%;background:var(--accent);transition:width 0.3s ease}

#content{display:flex;flex:1;overflow:hidden;z-index:1;position:relative}
#cv-wrap{flex:1;display:flex;align-items:center;justify-content:center;position:relative;min-width:0;background:var(--bg2);padding:0 16px}
#cell-canvas{display:block;cursor:grab;max-width:100%;max-height:100%}
#cell-canvas:active{cursor:grabbing}

.nav{position:absolute;top:50%;transform:translateY(-50%);background:var(--white);border:1px solid var(--border);color:var(--text3);font-size:1.2rem;width:36px;height:36px;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all 0.15s;z-index:5;border-radius:50%}
.nav:hover{border-color:var(--accent);color:var(--accent)}
#nav-p{left:1.2rem}
#nav-n{right:1.2rem}

#info{width:280px;flex-shrink:0;background:var(--white);border-left:1px solid var(--border);padding:1.6rem 1.3rem 5.5rem 1.3rem;display:flex;flex-direction:column;gap:1.1rem;overflow-y:auto;z-index:5}
.i-badge{display:inline-block;padding:0.2rem 0.6rem;background:var(--bg2);color:var(--accent);font-family:'Segoe UI',Arial,sans-serif;font-size:0.65rem;letter-spacing:0.1em;text-transform:uppercase;border-radius:3px;font-weight:600;width:fit-content;transition:all 0.3s ease}
.i-name{font-family:Georgia,serif;font-size:1.3rem;font-weight:700;color:var(--text);margin-top:0.3rem;line-height:1.3;transition:all 0.4s ease}
.i-div{height:1px;background:var(--border)}
.i-desc{font-family:'Segoe UI',Arial,sans-serif;font-size:0.87rem;color:var(--text2);line-height:1.7;transition:all 0.4s ease}
.i-desc.appear{animation:descAppear 0.6s ease-out forwards}
.i-name.appear{animation:nameAppear 0.5s ease-out forwards}
.facts-head{font-family:'Segoe UI',Arial,sans-serif;font-size:0.65rem;letter-spacing:0.1em;color:var(--accent);text-transform:uppercase;margin-bottom:0.4rem;font-weight:600}
.fact{display:flex;gap:0.6rem;align-items:flex-start;margin-bottom:0.55rem;transition:all 0.25s ease}
.fdot{width:5px;height:5px;background:var(--accent);border-radius:50%;margin-top:0.45rem;flex-shrink:0;transition:all 0.25s ease}
.ftext{font-family:'Segoe UI',Arial,sans-serif;font-size:0.83rem;color:var(--text2);line-height:1.55;transition:color 0.25s ease}
.i-result{background:var(--bg2);border-left:3px solid var(--accent);padding:0.7rem 0.9rem;font-family:'Segoe UI',Arial,sans-serif;font-size:0.82rem;color:var(--text);line-height:1.6;transition:all 0.4s ease}

.fact.active{background:rgba(91,111,138,0.12);border-left:3px solid var(--accent);padding-left:6px;margin-left:-9px;border-radius:2px;transform:translateX(2px);transition:all 0.4s ease}
.i-result{background:var(--bg2);border-left:3px solid var(--accent);padding:0.7rem 0.9rem;font-family:'Segoe UI',Arial,sans-serif;font-size:0.82rem;color:var(--text);line-height:1.6;transition:all 0.6s ease}

#info > div{animation:slideInInfo 0.3s ease}

#timeline{display:flex;align-items:center;border-top:1px solid var(--border);flex-shrink:0;z-index:10;position:relative;background:var(--white);padding:0.5rem 0}
.tl{flex:1;display:flex;flex-direction:column;align-items:center;gap:0.3rem;cursor:pointer;padding:0.5rem 0.3rem;position:relative;transition:all 0.2s}
.tl::after{content:'';position:absolute;right:0;top:30%;height:40%;width:1px;background:var(--border)}
.tl:last-child::after{display:none}
.tldot{width:7px;height:7px;border-radius:50%;border:1.5px solid var(--border);background:transparent;transition:all 0.3s}
.tl.active .tldot{background:var(--accent);border-color:var(--accent)}
.tl.done .tldot{background:var(--accent);border-color:var(--accent);opacity:0.4}
.tlname{font-family:'Segoe UI',Arial,sans-serif;font-size:0.6rem;letter-spacing:0.06em;color:var(--text3);text-align:center;text-transform:uppercase;transition:color 0.3s;font-weight:500}
.tl.active .tlname{color:var(--text);font-weight:600}
.tl.done .tlname{color:var(--text3);opacity:0.6}
.tl:hover .tlname{color:var(--text)}

#action-btn-wrapper {
  position: fixed;
  bottom: 4.5rem;
  right: 0.5rem;
  padding: 1rem;
  z-index: 50;
  display: flex;
  gap: 0.8rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}
#action-btn-wrapper.visible {
  opacity: 1;
}
#action-btn-wrapper.visible button {
  pointer-events: auto;
}
#auto-btn, #reset-btn {
  background: var(--white);
  border: 1px solid var(--border);
  color: var(--text3);
  font-family: 'Segoe UI', Arial, sans-serif;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  padding: 0.45rem 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
  border-radius: 3px;
  pointer-events: none;
}
#auto-btn:hover, #reset-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}
#auto-btn.playing {
  border-color: var(--stain);
  color: var(--stain);
}

/* ── Legend ─────────────────────────────────────────────────────────────────── */
#legend{
  position:absolute;
  bottom:10px;
  left:10px;
  background:rgba(245,243,239,0.92);
  padding:6px 10px;
  border-radius:3px;
  font-family:'Segoe UI',Arial,sans-serif;
  font-size:0.68rem;
  line-height:1.45;
  color:var(--text2);
  max-width:200px;
  z-index:10;
  border:1px solid var(--border);
  pointer-events:none;
}

/* FIX: was missing — legend heading "Legende" now styled properly */
.legend-head{
  font-family:'Segoe UI',Arial,sans-serif;
  font-size:0.6rem;
  font-weight:700;
  letter-spacing:0.1em;
  text-transform:uppercase;
  color:var(--accent);
  margin-bottom:5px;
}

.legend-item{
  display:flex;
  align-items:center;
  gap:8px;
  margin-bottom:4px;
  animation:legendFadeIn 0.4s ease-out forwards;
  opacity:0;
}

.legend-dot{
  width:10px;
  height:10px;
  border-radius:50%;
  display:inline-block;
  flex-shrink:0;
  box-shadow:0 0 0 1px rgba(0,0,0,0.08);
}

.legend-label{
  font-size:0.72rem;
  color:var(--text2);
}

@keyframes legendFadeIn{
  from{opacity:0;transform:translateX(-6px)}
  to{opacity:1;transform:translateX(0)}
}

/* ── Credit ──────────────────────────────────────────────────────────────────── */
#credit{
  position:absolute;
  bottom:10px;
  right:10px;
  background:rgba(245,243,239,0.92);
  padding:4px 8px;
  border-radius:3px;
  font-family:'Segoe UI',Arial,sans-serif;
  font-size:0.62rem;
  line-height:1.5;
  color:var(--text3);
  z-index:10;
  border:1px solid var(--border);
  pointer-events:none;
  letter-spacing:0.04em;
  font-weight:500;
  text-align:right;
}

#info::-webkit-scrollbar{width:4px}
#info::-webkit-scrollbar-track{background:transparent}
#info::-webkit-scrollbar-thumb{background:var(--border);border-radius:2px}

#cell-type-selector{
  display:none;
  gap:6px;
  margin-top:0.3rem;
  flex-wrap:wrap;
}
#cell-type-selector.active{display:flex}
.ct-btn{
  padding:0.3rem 0.6rem;
  border:1px solid var(--border);
  background:var(--white);
  font-family:'Segoe UI',Arial,sans-serif;
  font-size:0.68rem;
  letter-spacing:0.05em;
  color:var(--text2);
  cursor:pointer;
  border-radius:3px;
  transition:all 0.2s;
}
.ct-btn:hover{border-color:var(--accent);color:var(--accent)}
.ct-btn.active{
  background:var(--accent);
  color:white;
  border-color:var(--accent);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ── Language Selector ───────────────────────────────────────────────────────── */
.lang-selector {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
  opacity: 0;
  animation: fadeUp 1s 1.1s forwards;
}
.lang-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text3);
  padding: 0.4rem 1rem;
  font-family: 'Segoe UI', Arial, sans-serif;
  font-size: 0.85rem;
  cursor: pointer;
  border-radius: 3px;
  transition: all 0.2s;
}
.lang-btn.active, .lang-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ── Mobile Responsiveness ───────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .main-title { font-size: 3.5rem; }
  #content { flex-direction: column; overflow-y: auto; }
  #info { width: 100%; border-left: none; border-top: 1px solid var(--border); overflow-y: visible; padding-bottom: 6rem; }
  #timeline { overflow-x: auto; white-space: nowrap; padding: 0.8rem 0; }
  .tl { flex: 0 0 auto; min-width: 90px; }
  #cv-wrap { min-height: 45vh; }
  #topbar { flex-direction: column; gap: 0.5rem; padding: 0.5rem; }
  .nav { width: 30px; height: 30px; font-size: 1rem; }
  #action-btn-wrapper { bottom: 5rem; right: 0; }
  #auto-btn, #reset-btn { padding: 0.6rem 1rem; }
}