/* ============================================================
   MS Dendrite Tool — Stylesheet
   Aesthetic: Warm scientific · Organic · Accessible · Human
   ============================================================ */

:root {
  --cream: #FAF7F2;
  --warm-white: #FFF9F4;
  --ink: #1A1208;
  --ink-soft: #3D3020;
  --sand: #E8DDD0;
  --sand-dark: #C9B99F;
  --accent-blue: #2563EB;
  --accent-blue-light: #EFF6FF;
  --accent-orange: #EA580C;
  --accent-orange-light: #FFF7ED;
  --accent-green: #16A34A;
  --accent-green-light: #F0FDF4;
  --voltage: #F59E0B;
  --calcium: #06B6D4;
  --ms-red: #DC2626;
  --dark-bg: #0F1117;
  --dark-surface: #1A1F2E;
  --dark-border: #2A3045;
  --font-display: 'DM Serif Display', Georgia, serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 4px 24px rgba(26,18,8,0.08);
  --shadow-lg: 0 12px 48px rgba(26,18,8,0.14);
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-body);
  background: var(--cream);
  color: var(--ink);
  line-height: 1.7;
  overflow-x: hidden;
}

/* ─── TYPOGRAPHY ─── */
h1, h2, h3, h4 { font-family: var(--font-display); line-height: 1.2; }
h1 { font-size: clamp(2.6rem, 6vw, 4.5rem); }
h2 { font-size: clamp(1.8rem, 4vw, 2.8rem); margin-bottom: 1rem; }
h3 { font-size: 1.3rem; margin-bottom: 0.5rem; }
h4 { font-size: 1.1rem; margin-bottom: 0.4rem; }
em { font-style: italic; color: var(--accent-orange); }
p { color: var(--ink-soft); max-width: 60ch; }
strong { color: var(--ink); font-weight: 500; }
a { color: var(--accent-blue); text-decoration: none; }

/* ─── LAYOUT ─── */
.container { max-width: 1100px; margin: 0 auto; padding: 0 2rem; }
.container.narrow { max-width: 760px; }
.section { padding: 6rem 0; }
.section--dark { background: var(--dark-bg); color: var(--cream); }
.section--warm { background: var(--accent-orange-light); }
.section-label {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent-orange);
  margin-bottom: 0.75rem;
}
.section-label.light { color: var(--accent-orange); }
.intro { font-size: 1.1rem; max-width: 56ch; margin-bottom: 2.5rem; }
.intro.light { color: #CBD5E1; }
h2.light { color: var(--cream); }

/* ─── HERO ─── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--dark-bg);
}
.hero-bg {
  position: absolute; inset: 0;
  opacity: 0.6;
}
#neuron-canvas { width: 100%; height: 100%; display: block; }

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 2rem;
  max-width: 820px;
}
.hero-content h1 { color: var(--cream); margin-bottom: 1.2rem; }
.hero-content p { color: #94A3B8; font-size: 1.2rem; max-width: 52ch; margin: 0 auto 2rem; }
.pill {
  display: inline-block;
  background: rgba(234,88,12,0.15);
  border: 1px solid rgba(234,88,12,0.4);
  color: #FB923C;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  padding: 0.35rem 1rem;
  border-radius: 999px;
  margin-bottom: 1.5rem;
}
.hero-cta { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

.scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  color: #64748B;
  font-size: 1.5rem;
  animation: bounce 2s infinite;
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* ─── BUTTONS ─── */
.btn-primary {
  display: inline-block;
  background: var(--accent-orange);
  color: #fff;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.85rem 2rem;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
}
.btn-primary:hover { background: #C2410C; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(234,88,12,0.35); }
.btn-primary.full { width: 100%; text-align: center; }

.btn-ghost {
  display: inline-block;
  background: transparent;
  color: var(--cream);
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 0.95rem;
  padding: 0.85rem 2rem;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.2);
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
}
.btn-ghost:hover { border-color: rgba(255,255,255,0.5); background: rgba(255,255,255,0.05); }

/* ─── CARDS ─── */
.cards-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; margin-top: 2.5rem; }

.card {
  padding: 2rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease, box-shadow 0.25s ease;
}
.card[data-aos].visible { opacity: 1; transform: translateY(0); }
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.card--blue { background: var(--accent-blue-light); border-color: #BFDBFE; }
.card--orange { background: var(--accent-orange-light); border-color: #FED7AA; }
.card--green { background: var(--accent-green-light); border-color: #BBF7D0; }
.card-icon { font-size: 2.2rem; margin-bottom: 1rem; }
.card h3 { margin-bottom: 0.6rem; }

/* ─── SIMULATOR ─── */
.sim-wrapper {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 2rem;
  background: var(--dark-surface);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius);
  padding: 2rem;
  margin-top: 2rem;
}
@media (max-width: 768px) {
  .sim-wrapper { grid-template-columns: 1fr; }
}

.sim-controls { display: flex; flex-direction: column; gap: 1.5rem; }
.control-group label { display: block; color: #94A3B8; font-size: 0.78rem; font-weight: 500; letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 0.6rem; }

.toggle-row { display: flex; align-items: center; gap: 0.75rem; color: #CBD5E1; font-size: 0.9rem; }
.toggle { position: relative; width: 48px; height: 26px; }
.toggle input { opacity: 0; width: 0; height: 0; }
.slider {
  position: absolute; inset: 0;
  background: #374151; border-radius: 999px; cursor: pointer;
  transition: background 0.2s;
}
.slider::before {
  content: '';
  position: absolute;
  width: 20px; height: 20px;
  left: 3px; top: 3px;
  background: white; border-radius: 50%;
  transition: transform 0.2s;
}
.toggle input:checked + .slider { background: var(--ms-red); }
.toggle input:checked + .slider::before { transform: translateX(22px); }

.btn-group { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.sig-btn {
  flex: 1; padding: 0.6rem 0.8rem;
  background: var(--dark-bg); color: #94A3B8;
  border: 1px solid var(--dark-border); border-radius: var(--radius-sm);
  cursor: pointer; font-family: var(--font-body); font-size: 0.85rem;
  transition: all 0.2s;
}
.sig-btn.active, .sig-btn:hover { background: var(--accent-orange); color: white; border-color: var(--accent-orange); }

.strength-meter { margin-top: 0.4rem; }
.strength-bar { height: 10px; background: var(--dark-bg); border-radius: 999px; overflow: hidden; border: 1px solid var(--dark-border); }
.strength-fill {
  height: 100%; width: 75%;
  background: linear-gradient(90deg, var(--voltage), var(--calcium));
  border-radius: 999px;
  transition: width 0.8s ease;
}
.strength-labels { display: flex; justify-content: space-between; color: #6B7280; font-size: 0.72rem; margin-top: 0.3rem; }

.legend { margin-top: auto; }
.legend-item { display: flex; align-items: center; gap: 0.5rem; color: #94A3B8; font-size: 0.85rem; margin-bottom: 0.4rem; }
.dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.dot.voltage { background: var(--voltage); }
.dot.calcium { background: var(--calcium); }

.sim-canvas-wrap { position: relative; }
#neuron-sim { width: 100%; border-radius: var(--radius-sm); background: #0A0D14; display: block; }
.sim-info {
  position: absolute; bottom: 1rem; left: 50%; transform: translateX(-50%);
  background: rgba(0,0,0,0.6); backdrop-filter: blur(8px);
  color: #CBD5E1; font-size: 0.85rem;
  padding: 0.6rem 1.2rem; border-radius: 999px;
  white-space: nowrap; pointer-events: none;
  transition: opacity 0.3s;
}

/* ─── FINDINGS ─── */
.findings { margin-top: 2.5rem; display: flex; flex-direction: column; gap: 2rem; }
.finding {
  display: flex; gap: 2rem; align-items: flex-start;
  padding: 2rem;
  background: var(--warm-white);
  border: 1px solid var(--sand);
  border-radius: var(--radius);
  opacity: 0; transform: translateX(-20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.finding[data-aos].visible { opacity: 1; transform: translateX(0); }
.finding-num {
  font-family: var(--font-display);
  font-size: 3rem;
  color: var(--sand-dark);
  line-height: 1;
  flex-shrink: 0;
  min-width: 2.5rem;
}
.finding h3 { margin-bottom: 0.6rem; }
.finding p { max-width: none; }
.finding-tag {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  background: var(--accent-blue-light);
  border-left: 3px solid var(--accent-blue);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.88rem;
  color: #1E40AF;
}
@media (max-width: 600px) {
  .finding { flex-direction: column; gap: 0.5rem; }
  .finding-num { font-size: 2rem; }
}

/* ─── IMPACT GRID ─── */
.impact-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1.5rem; margin-top: 2.5rem; }
.impact-card {
  background: white;
  border: 1px solid #FED7AA;
  border-radius: var(--radius);
  padding: 1.75rem;
  opacity: 0; transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.impact-card[data-aos].visible { opacity: 1; transform: translateY(0); }
.impact-icon { font-size: 2rem; margin-bottom: 0.75rem; }
.impact-card p { font-size: 0.92rem; max-width: none; }

/* ─── GLOSSARY ─── */
.glossary { margin-top: 2rem; display: flex; flex-direction: column; gap: 0; }
.glossary-item {
  border-bottom: 1px solid var(--sand);
  overflow: hidden;
}
.glossary-item:first-child { border-top: 1px solid var(--sand); }
.glossary-trigger {
  display: flex; justify-content: space-between; align-items: center;
  padding: 1.1rem 0;
  cursor: pointer;
  font-weight: 500;
  font-size: 1rem;
  color: var(--ink);
  background: none; border: none;
  width: 100%; text-align: left;
  font-family: var(--font-body);
}
.glossary-trigger:hover { color: var(--accent-orange); }
.glossary-arrow { font-size: 0.9rem; transition: transform 0.3s; color: var(--accent-orange); }
.glossary-item.open .glossary-arrow { transform: rotate(90deg); }
.glossary-body {
  max-height: 0; overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  color: var(--ink-soft);
  font-size: 0.95rem;
}
.glossary-item.open .glossary-body { max-height: 200px; padding-bottom: 1rem; }

/* ─── FOOTER ─── */
.footer {
  background: var(--ink);
  color: #6B7280;
  text-align: center;
  padding: 3rem 2rem;
  font-size: 0.88rem;
}
.footer p { max-width: none; color: #6B7280; margin: 0 auto; }
.footer-small { margin-top: 0.75rem; font-size: 0.78rem; color: #4B5563; }

/* ─── ANIMATIONS ─── */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to   { opacity: 1; transform: translateY(0); }
}
.hero-content { animation: fadeInUp 1s ease both; }