/* ============================================
   Brain 3D — Three.js Visualization Page
   Mobile-First · Glassmorphism Overlays
   ============================================ */

/* --- Canvas --- */
#brain3dCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: auto;
  touch-action: pan-y; /* Fix Scroll Hijacking — Allow native scroll over canvas */
}

/* --- Scroll Container --- */
.b3d-scroll {
  position: relative;
  z-index: 1;
  pointer-events: none;
}

.b3d-scroll > * {
  pointer-events: auto;
}

/* --- Sections --- */
.b3d-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 20px;
  position: relative;
}

.b3d-section--hero {
  min-height: 100vh;
  padding-top: 120px;
}

/* --- Overlay Panels --- */
.b3d-panel {
  max-width: 560px;
  width: 100%;
  padding: 32px 28px;
  border-radius: 20px;
  background: rgba(10, 10, 15, 0.75);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.b3d-panel.visible {
  opacity: 1;
  transform: translateY(0);
}

.b3d-panel--right {
  margin-left: auto;
  margin-right: 5%;
}

.b3d-panel--left {
  margin-right: auto;
  margin-left: 5%;
}

.b3d-panel--center {
  margin: 0 auto;
  text-align: center;
}

/* --- Hero Content --- */
.b3d-hero {
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
}

.b3d-hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  border-radius: 100px;
  border: 1px solid rgba(196, 248, 42, 0.2);
  background: rgba(196, 248, 42, 0.06);
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-lime, #C4F82A);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 24px;
  animation: b3dFadeInUp 0.8s ease-out 0.2s both;
}

.b3d-hero__title {
  font-family: var(--font-display, 'Space Grotesk', sans-serif);
  font-size: clamp(32px, 6vw, 60px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -1px;
  margin-bottom: 20px;
  animation: b3dFadeInUp 0.8s ease-out 0.4s both;
}

.b3d-hero__title span {
  background: linear-gradient(135deg, #C4F82A, #06D6A0, #06B6D4);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.b3d-hero__sub {
  font-size: clamp(15px, 2vw, 18px);
  color: var(--text-secondary, #A1A1AA);
  line-height: 1.6;
  max-width: 540px;
  margin: 0 auto 32px;
  animation: b3dFadeInUp 0.8s ease-out 0.6s both;
}

.b3d-hero__scroll {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted, #71717A);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  animation: b3dFadeInUp 0.8s ease-out 0.8s both;
}

.b3d-hero__scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--accent-lime, #C4F82A), transparent);
  animation: b3dScrollPulse 2s ease-in-out infinite;
}

@keyframes b3dScrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(1); }
  50% { opacity: 1; transform: scaleY(1.3); }
}

@keyframes b3dFadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

/* --- Panel Typography --- */
.b3d-label {
  display: inline-block;
  font-family: var(--font-display, 'Space Grotesk', sans-serif);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 12px;
  padding: 4px 12px;
  border-radius: 100px;
}

.b3d-label--purple {
  color: #c084fc;
  background: rgba(168, 85, 247, 0.1);
  border: 1px solid rgba(168, 85, 247, 0.2);
}

.b3d-label--cyan {
  color: #22d3ee;
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.2);
}

.b3d-label--lime {
  color: #C4F82A;
  background: rgba(196, 248, 42, 0.1);
  border: 1px solid rgba(196, 248, 42, 0.2);
}

.b3d-label--orange {
  color: #fb923c;
  background: rgba(249, 115, 22, 0.1);
  border: 1px solid rgba(249, 115, 22, 0.2);
}

.b3d-label--blue {
  color: #60a5fa;
  background: rgba(37, 99, 235, 0.1);
  border: 1px solid rgba(37, 99, 235, 0.2);
}

.b3d-title {
  font-family: var(--font-display, 'Space Grotesk', sans-serif);
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 16px;
}

.b3d-desc {
  font-size: 15px;
  color: var(--text-secondary, #A1A1AA);
  line-height: 1.7;
  margin-bottom: 20px;
}

/* --- Tier Cards --- */
.b3d-tiers {
  display: grid;
  gap: 12px;
}

.b3d-tier {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 16px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
  transition: border-color 0.3s, background 0.3s;
}

.b3d-tier:hover {
  border-color: rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.05);
}

.b3d-tier__icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

.b3d-tier__info h4 {
  font-family: var(--font-display, 'Space Grotesk', sans-serif);
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 3px;
}

.b3d-tier__info p {
  font-size: 12px;
  color: var(--text-muted, #71717A);
  line-height: 1.5;
}

/* --- Skill Category Grid --- */
.b3d-skills-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 16px;
}

.b3d-skill-cat {
  padding: 14px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
  text-align: center;
  transition: transform 0.3s, border-color 0.3s;
}

.b3d-skill-cat:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 255, 255, 0.12);
}

.b3d-skill-cat__icon {
  font-size: 24px;
  margin-bottom: 6px;
}

.b3d-skill-cat__name {
  font-family: var(--font-display, 'Space Grotesk', sans-serif);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 3px;
}

.b3d-skill-cat__count {
  font-size: 11px;
  color: var(--text-muted, #71717A);
}

/* --- Workflow Flow --- */
.b3d-flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
}

.b3d-flow__step {
  padding: 12px 18px; /* UX Master Directive 1: Minimum 44px total height */
  border-radius: 8px;
  font-family: var(--font-mono, 'Space Mono', monospace);
  font-size: 13px;
  font-weight: 500;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  white-space: nowrap;
  transition: background 0.2s, border-color 0.2s;
  cursor: pointer;
}

.b3d-flow__step:active {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--accent-lime);
}

.b3d-flow__arrow {
  color: var(--accent-lime, #C4F82A);
  font-size: 16px;
  font-weight: 700;
}

/* --- Cloud Brain Icons --- */
.b3d-cloud-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 16px;
}

.b3d-cloud-feat {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px;
  border-radius: 10px;
  background: rgba(168, 85, 247, 0.06);
  border: 1px solid rgba(168, 85, 247, 0.12);
}

.b3d-cloud-feat__icon {
  font-size: 20px;
  flex-shrink: 0;
}

.b3d-cloud-feat__text {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary, #A1A1AA);
}

/* --- CTA Section --- */
.b3d-cta {
  text-align: center;
  max-width: 500px;
  margin: 0 auto;
}

.b3d-cta__btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 18px 48px;
  border-radius: 12px;
  background: var(--accent-lime, #C4F82A);
  color: #0A0A0F;
  font-family: var(--font-display, 'Space Grotesk', sans-serif);
  font-size: 17px;
  font-weight: 700;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 24px rgba(196, 248, 42, 0.25);
}

.b3d-cta__btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 40px rgba(196, 248, 42, 0.4);
}

.b3d-cta__back {
  display: block;
  margin-top: 20px;
  font-size: 14px;
  color: var(--text-muted, #71717A);
  text-decoration: none;
  transition: color 0.2s;
}

.b3d-cta__back:hover {
  color: var(--text-secondary, #A1A1AA);
}

/* --- Node Tooltip --- */
.b3d-tooltip {
  position: fixed;
  padding: 18px 22px;
  background: rgba(20, 20, 32, 0.85); /* Premium glassmorphism */
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 14px;
  pointer-events: none;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.3s, transform 0.3s;
  z-index: 200;
  min-width: 200px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.6), 
              0 0 20px rgba(139, 92, 246, 0.2); /* Subtle purple glow */
}

.b3d-tooltip.show {
  opacity: 1;
  transform: translateY(0);
}

.b3d-tooltip__name {
  display: block;
  font-family: var(--font-display, 'Space Grotesk', sans-serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--accent-lime);
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}

.b3d-tooltip__desc {
  display: block;
  font-size: 13px;
  color: #CBD5E1;
  line-height: 1.5;
}

/* --- Scroll Progress --- */
.b3d-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-lime, #C4F82A), var(--accent-cyan, #06B6D4));
  z-index: 200;
  width: 0%;
  transition: width 0.1s linear;
}

/* --- Responsive — Mobile First --- */
@media (max-width: 767px) {
  .b3d-section {
    padding: 60px 16px;
    align-items: flex-end;
    padding-bottom: 60px; /* UX Master Directive 1: Thumb Zone clearance */
  }

  .b3d-section--hero {
    padding-top: 100px;
    align-items: center;
  }

  .b3d-panel {
    max-width: 100%;
    padding: 24px 20px;
    border-radius: 16px;
    margin: 0 !important;
  }

  .b3d-hero__title {
    font-size: 28px;
  }

  .b3d-skills-grid {
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  .b3d-cloud-features {
    grid-template-columns: 1fr;
  }

  .b3d-flow {
    justify-content: center;
  }

  .b3d-cta__btn {
    padding: 20px 48px; /* UX Master Directive 1: Better mobile tap target */
    font-size: 16px;
    width: 100%; /* Full width for easier thumb access */
    justify-content: center;
    transition: transform 0.1s, background 0.2s, box-shadow 0.2s;
  }

  .b3d-cta__btn:active {
    transform: scale(0.97); /* Tactile feedback on tap */
    filter: brightness(1.2);
    box-shadow: 0 0 30px var(--accent-lime);
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .b3d-panel {
    max-width: 480px;
  }
}

@media (min-width: 1024px) {
  .b3d-section {
    padding: 100px 60px;
  }

  .b3d-panel {
    max-width: 520px;
  }

  .b3d-skills-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

/* --- Nav override for transparent bg --- */
body.b3d-page .nav {
  background: rgba(10, 10, 15, 0.5);
}

/* --- Redesigned CTA & Install --- */
.b3d-tabs-wrapper {
  display: flex;
  justify-content: center;
  margin-bottom: 30px;
}

.b3d-tabs {
  position: relative;
  display: inline-flex;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  padding: 4px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.b3d-tab {
  position: relative;
  z-index: 2;
  padding: 10px 24px;
  border: none;
  background: none;
  color: rgba(255, 255, 255, 0.6);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: color 0.3s ease;
  white-space: nowrap;
}

.b3d-tab.active {
  color: #fff;
}

.b3d-tab-glider {
  position: absolute;
  top: 4px;
  left: 4px;
  height: calc(100% - 8px);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(8px);
  border-radius: 8px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 1;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

/* --- Code Box --- */
.b3d-code-box {
  background: rgba(0, 0, 0, 0.4);
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  overflow: hidden;
  margin-bottom: 20px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
  text-align: left;
}

.b3d-code-header {
  background: rgba(255, 255, 255, 0.05);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.b3d-code-dots {
  display: flex;
  gap: 6px;
}

.b3d-code-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
}

.b3d-code-dots span:nth-child(1) { background: #ff5f56; }
.b3d-code-dots span:nth-child(2) { background: #ffbd2e; }
.b3d-code-dots span:nth-child(3) { background: #27c93f; }

.b3d-code-label {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.4);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.b3d-code-body {
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.b3d-code-body code {
  color: #67e8f9;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 14px;
  flex: 1;
  word-break: break-all;
}

.b3d-copy-btn {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #fff;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.b3d-copy-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: scale(1.05);
}

.b3d-install-note {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
  margin-top: 10px;
  text-align: center;
}

/* --- IDE Grid --- */
.b3d-ide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}

.b3d-ide-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.b3d-ide-card i {
  color: rgba(255, 255, 255, 0.4);
  width: 24px;
  height: 24px;
}

.b3d-ide-card span {
  font-size: 11px;
  color: rgba(255, 255, 255, 0.6);
  font-weight: 500;
  text-align: center;
}

.b3d-ide-card:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.b3d-ide-card.active {
  background: rgba(167, 139, 250, 0.1);
  border-color: #a78bfa;
}

.b3d-ide-card.active i {
  color: #a78bfa;
}

.b3d-ide-card.active span {
  color: #fff;
}