/* ==========================================================================
   Joviraj 3D Studios - Design System & 3D CSS Stylesheet
   Pure Modern CSS with CSS 3D Transforms, Isometric Grids & Parallax Depth.
   Zero external dependencies. Accessible, Responsive, Dark/Light Mode.
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Design Tokens)
   -------------------------------------------------------------------------- */
:root {
  /* Color Palette - Light Theme */
  --color-primary: #5c3cf6;
  --color-primary-hover: #4a2ae0;
  --color-primary-light: #ece9fe;
  --color-primary-glow: rgba(92, 60, 246, 0.35);
  
  --color-secondary: #f59e0b;
  --color-secondary-hover: #d97706;
  --color-secondary-light: #fef3c7;
  
  --color-accent-teal: #06b6d4;
  --color-accent-green: #10b981;
  --color-accent-green-light: #d1fae5;
  --color-accent-coral: #f43f5e;
  
  --color-bg: #f5f7fc;
  --color-surface: #ffffff;
  --color-surface-elevated: #ffffff;
  --color-surface-hover: #f1f5f9;
  
  --color-text: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --color-border-hover: #cbd5e1;
  
  /* 3D Depth Palette */
  --depth-shadow-3d: 0 15px 35px -5px rgba(0, 0, 0, 0.12), 0 5px 15px rgba(0, 0, 0, 0.06);
  --depth-card-side: #cbd5e1;
  --depth-btn-edge: #432bb3;
  --depth-chess-wood-dark: #b45309;
  --depth-chess-wood-light: #fde68a;
  --depth-farm-soil: #78350f;
  --depth-farm-soil-rich: #451a03;
  --depth-farm-grass: #15803d;

  /* Gradients */
  --gradient-hero: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #ec4899 100%);
  --gradient-badge: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
  --gradient-card-chess: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
  --gradient-card-farm: linear-gradient(135deg, #10b981 0%, #047857 100%);
  --gradient-card-math: linear-gradient(135deg, #8b5cf6 0%, #d946ef 100%);
  --gradient-card-code: linear-gradient(135deg, #06b6d4 0%, #0284c7 100%);

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  
  /* Radii */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;
  
  /* Layout */
  --container-max: 1200px;
  --header-height: 72px;
  --transition-fast: 150ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 250ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-spring: 400ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* --------------------------------------------------------------------------
   Dark Mode Overrides
   -------------------------------------------------------------------------- */
[data-theme="dark"] {
  --color-bg: #070a12;
  --color-surface: #101626;
  --color-surface-elevated: #162035;
  --color-surface-hover: #1f2d4a;
  
  --color-text: #f8fafc;
  --color-text-secondary: #cbd5e1;
  --color-text-muted: #94a3b8;
  --color-border: #1e293b;
  --color-border-hover: #334155;
  
  --color-primary-light: #231b52;
  --color-primary-glow: rgba(124, 58, 237, 0.5);
  --color-secondary-light: #3d2a08;
  --color-accent-green-light: #064e3b;
  
  --depth-shadow-3d: 0 20px 40px -5px rgba(0, 0, 0, 0.65), 0 0 25px rgba(92, 60, 246, 0.2);
  --depth-card-side: #0a0e18;
  --depth-btn-edge: #311c8a;
  --depth-chess-wood-dark: #78350f;
  --depth-chess-wood-light: #d97706;
}

/* --------------------------------------------------------------------------
   Reset & Base
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 20px);
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
  perspective: 1200px; /* Global 3D perspective context */
}

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

button, input, textarea, select {
  font: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

ul, ol {
  list-style: none;
}

:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* --------------------------------------------------------------------------
   3D Utilities & Perspective Containers
   -------------------------------------------------------------------------- */
.preserve-3d {
  transform-style: preserve-3d;
}

.perspective-viewport {
  perspective: 1200px;
  perspective-origin: center center;
}

/* 3D Tilted Card Wrapper */
.card-3d-wrap {
  perspective: 1000px;
  transform-style: preserve-3d;
}

.card-3d {
  transform-style: preserve-3d;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  will-change: transform;
}

.card-3d:hover {
  box-shadow: var(--depth-shadow-3d);
}

/* Elements inside a 3D card that pop out forward in Z space */
.pop-z-sm { transform: translateZ(15px); }
.pop-z-md { transform: translateZ(30px); }
.pop-z-lg { transform: translateZ(50px); }
.pop-z-xl { transform: translateZ(75px); }

/* 3D Extruded Buttons */
.btn-3d {
  position: relative;
  transform-style: preserve-3d;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  box-shadow: 0 6px 0 var(--depth-btn-edge), 0 10px 20px rgba(0, 0, 0, 0.2);
}

.btn-3d:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 0 var(--depth-btn-edge), 0 14px 24px rgba(0, 0, 0, 0.25);
}

.btn-3d:active {
  transform: translateY(4px);
  box-shadow: 0 2px 0 var(--depth-btn-edge), 0 4px 10px rgba(0, 0, 0, 0.15);
}

/* --------------------------------------------------------------------------
   Floating Parallax Background Objects
   -------------------------------------------------------------------------- */
.parallax-bg-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}

.floating-3d-shape {
  position: absolute;
  transform-style: preserve-3d;
  animation: float-3d-spin 12s ease-in-out infinite alternate;
  filter: drop-shadow(0 15px 25px rgba(92, 60, 246, 0.2));
  opacity: 0.85;
}

@keyframes float-3d-spin {
  0% {
    transform: translateY(0px) rotateX(15deg) rotateY(15deg) rotateZ(0deg);
  }
  50% {
    transform: translateY(-25px) rotateX(30deg) rotateY(45deg) rotateZ(10deg);
  }
  100% {
    transform: translateY(10px) rotateX(-15deg) rotateY(-20deg) rotateZ(-10deg);
  }
}

/* --------------------------------------------------------------------------
   Layout Containers & Utilities
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 1.5rem;
  position: relative;
  z-index: 1;
}

.section {
  padding-block: 6rem;
  position: relative;
}

.section-title-wrap {
  text-align: center;
  max-width: 720px;
  margin-inline: auto;
  margin-bottom: 3.5rem;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.badge-primary {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

.badge-secondary {
  background-color: var(--color-secondary-light);
  color: var(--color-secondary);
}

.badge-green {
  background-color: var(--color-accent-green-light);
  color: var(--color-accent-green);
}

.badge-status {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.badge-dev {
  background: rgba(245, 158, 11, 0.2);
  color: var(--color-secondary);
  border: 1px solid rgba(245, 158, 11, 0.4);
}

.badge-concept {
  background: rgba(92, 60, 246, 0.2);
  color: var(--color-primary);
  border: 1px solid rgba(92, 60, 246, 0.4);
}

.section-title {
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  font-weight: 850;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
  color: var(--color-text);
}

.section-desc {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
}

.text-gradient {
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1rem;
  padding: 0.75rem 1.6rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-primary);
  color: #ffffff;
  box-shadow: 0 4px 14px var(--color-primary-glow);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  box-shadow: 0 8px 22px var(--color-primary-glow);
  transform: translateY(-2px);
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.btn-secondary:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-border-hover);
  transform: translateY(-2px);
}

.btn-accent {
  background: var(--gradient-badge);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(245, 158, 11, 0.35);
}

.btn-accent:hover {
  filter: brightness(1.08);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 0.45rem 1rem;
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 0.95rem 2rem;
  font-size: 1.125rem;
  border-radius: var(--radius-lg);
}

/* --------------------------------------------------------------------------
   Site Header & Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: rgba(245, 247, 252, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

[data-theme="dark"] .site-header {
  background-color: rgba(7, 10, 18, 0.85);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.35rem;
  font-weight: 850;
  letter-spacing: -0.02em;
  color: var(--color-text);
  transform-style: preserve-3d;
}

.brand-icon-3d {
  width: 40px;
  height: 40px;
  background: var(--gradient-hero);
  border-radius: 12px;
  display: grid;
  place-items: center;
  color: #ffffff;
  box-shadow: 0 8px 16px var(--color-primary-glow), inset 0 2px 4px rgba(255, 255, 255, 0.3);
  transform: perspective(600px) rotateY(-12deg) rotateX(8deg);
  transition: transform var(--transition-spring);
}

.brand-logo:hover .brand-icon-3d {
  transform: perspective(600px) rotateY(15deg) rotateX(-5deg) scale(1.08);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.85rem;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-primary);
  transform: translateY(-1px);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.theme-toggle-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: grid;
  place-items: center;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  color: var(--color-text);
  border-color: var(--color-border-hover);
  background-color: var(--color-surface-hover);
}

.mobile-nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  place-items: center;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
}

/* --------------------------------------------------------------------------
   Hero Section with 3D Depth & Parallax
   -------------------------------------------------------------------------- */
.hero-section {
  padding-top: 5rem;
  padding-bottom: 6.5rem;
  position: relative;
  overflow: hidden;
  perspective: 1200px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 4rem;
}

.hero-badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.4rem 0.9rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
  margin-bottom: 1.5rem;
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-secondary);
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

.hero-headline {
  font-size: clamp(2.5rem, 5vw, 3.85rem);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
  color: var(--color-text);
}

.hero-subhead {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 2.25rem;
  max-width: 580px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.hero-notice-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1.25rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  max-width: 540px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
}

/* 3D Hero Hologram Stage Card */
.hero-stage-card-3d {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: var(--depth-shadow-3d);
  transform-style: preserve-3d;
  transform: perspective(1000px) rotateY(-8deg) rotateX(6deg);
  transition: transform var(--transition-spring);
  position: relative;
}

.hero-stage-card-3d:hover {
  transform: perspective(1000px) rotateY(0deg) rotateX(0deg) translateZ(10px);
}

.hero-stage-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

/* 3D Isometric Viewport Mockup */
.hero-isometric-viewport {
  background: radial-gradient(circle at 50% 20%, #1e1b4b, #0f172a 90%);
  border-radius: var(--radius-lg);
  padding: 2.5rem 1.5rem;
  color: #ffffff;
  position: relative;
  overflow: hidden;
  height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
  transform-style: preserve-3d;
}

/* Animated 3D Floating Cube / Prism in Hero */
.cube-3d-scene {
  width: 120px;
  height: 120px;
  position: relative;
  transform-style: preserve-3d;
  animation: spin-cube-3d 14s linear infinite;
}

@keyframes spin-cube-3d {
  0% { transform: rotateX(25deg) rotateY(0deg); }
  50% { transform: rotateX(-15deg) rotateY(180deg); }
  100% { transform: rotateX(25deg) rotateY(360deg); }
}

.cube-face {
  position: absolute;
  width: 120px;
  height: 120px;
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-radius: 12px;
  display: grid;
  place-items: center;
  font-size: 2.25rem;
  font-weight: 800;
  color: #ffffff;
  backdrop-filter: blur(8px);
  box-shadow: inset 0 0 20px rgba(92, 60, 246, 0.4);
}

.cube-front  { background: rgba(92, 60, 246, 0.6); transform: translateZ(60px); }
.cube-back   { background: rgba(16, 185, 129, 0.6); transform: rotateY(180deg) translateZ(60px); }
.cube-right  { background: rgba(245, 158, 11, 0.6); transform: rotateY(90deg) translateZ(60px); }
.cube-left   { background: rgba(6, 182, 212, 0.6); transform: rotateY(-90deg) translateZ(60px); }
.cube-top    { background: rgba(244, 63, 94, 0.6); transform: rotateX(90deg) translateZ(60px); }
.cube-bottom { background: rgba(139, 92, 246, 0.6); transform: rotateX(-90deg) translateZ(60px); }

.hero-stage-badge-pop {
  position: absolute;
  bottom: -15px;
  right: -15px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--color-text);
  font-size: 0.85rem;
  font-weight: 800;
  transform: translateZ(40px);
}

/* --------------------------------------------------------------------------
   3D Section 1: Playable 3D Chess Tactics Lab
   -------------------------------------------------------------------------- */
.chess-section {
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-surface) 100%);
  position: relative;
  overflow: hidden;
}

.chess-interactive-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 3.5rem;
  max-width: 1100px;
  margin-inline: auto;
}

.chess-board-stage {
  perspective: 1100px;
  padding: 2.5rem 1rem;
  display: flex;
  justify-content: center;
  align-items: center;
}

/* 3D Isometric Chessboard */
.chessboard-3d {
  width: 360px;
  height: 360px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(4, 1fr);
  transform-style: preserve-3d;
  transform: rotateX(50deg) rotateZ(-28deg);
  border-radius: 12px;
  border: 10px solid #292524;
  box-shadow: 
    -10px 10px 0px #1c1917,
    -20px 20px 25px rgba(0, 0, 0, 0.4),
    0 0 35px var(--color-primary-glow);
  transition: transform var(--transition-normal);
}

.chessboard-3d:hover {
  transform: rotateX(46deg) rotateZ(-24deg) translateZ(10px);
}

.chess-tile-3d {
  position: relative;
  display: grid;
  place-items: center;
  cursor: pointer;
  transform-style: preserve-3d;
  transition: transform var(--transition-fast), background-color var(--transition-fast);
  user-select: none;
}

.chess-tile-3d.tile-light {
  background-color: #f5f5f4;
}

.chess-tile-3d.tile-dark {
  background-color: #78716c;
}

.chess-tile-3d:hover {
  transform: translateZ(12px);
  filter: brightness(1.15);
}

.chess-tile-3d.tile-selected {
  background-color: #facc15 !important;
  transform: translateZ(16px);
  box-shadow: 0 0 15px rgba(250, 204, 21, 0.6);
}

.chess-tile-3d.tile-target {
  background-color: #86efac !important;
  transform: translateZ(14px);
}

.chess-piece-3d {
  font-size: 2.75rem;
  line-height: 1;
  transform-style: preserve-3d;
  transform: translateZ(28px) rotateX(-50deg) rotateZ(28deg); /* Billboard towards camera */
  filter: drop-shadow(-4px 8px 6px rgba(0, 0, 0, 0.4));
  transition: transform var(--transition-spring);
  pointer-events: none;
}

.chess-tile-3d:hover .chess-piece-3d {
  transform: translateZ(36px) rotateX(-50deg) rotateZ(28deg) scale(1.15);
}

.chess-controls-card {
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 2.25rem;
  box-shadow: var(--depth-shadow-3d);
}

.chess-info-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

.chess-instruction-box {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}

.chess-feedback-msg {
  min-height: 44px;
  display: flex;
  align-items: center;
  font-size: 1rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  margin-bottom: 1.25rem;
  padding-inline: 1rem;
  transition: all var(--transition-fast);
}

.chess-feedback-msg.success {
  background: var(--color-accent-green-light);
  color: var(--color-accent-green);
}

.chess-feedback-msg.error {
  background: #ffe4e6;
  color: var(--color-accent-coral);
}

/* --------------------------------------------------------------------------
   3D Section 2: Playable 3D Eco-Farm Simulator
   -------------------------------------------------------------------------- */
.farm-section {
  background-color: var(--color-surface);
  border-block: 1px solid var(--color-border);
  position: relative;
  overflow: hidden;
}

.farm-interactive-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 3.5rem;
  max-width: 1100px;
  margin-inline: auto;
}

.farm-board-stage {
  perspective: 1100px;
  padding: 2.5rem 1rem;
  display: flex;
  justify-content: center;
  align-items: center;
}

/* 3D Isometric Farm Field Grid */
.farm-grid-3d {
  width: 340px;
  height: 340px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 12px;
  transform-style: preserve-3d;
  transform: rotateX(54deg) rotateZ(-32deg);
  transition: transform var(--transition-normal);
}

.farm-grid-3d:hover {
  transform: rotateX(50deg) rotateZ(-28deg) translateZ(8px);
}

.farm-tile-3d {
  background: #78350f; /* Soil Brown */
  border-radius: 12px;
  border: 4px solid #451a03;
  box-shadow: -4px 6px 0px #291203, -8px 12px 15px rgba(0, 0, 0, 0.35);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transform-style: preserve-3d;
  transition: transform var(--transition-fast), background-color var(--transition-fast), box-shadow var(--transition-fast);
  user-select: none;
  position: relative;
}

.farm-tile-3d:hover {
  transform: translateZ(16px);
  filter: brightness(1.12);
  box-shadow: -6px 10px 0px #291203, -12px 18px 20px rgba(0, 0, 0, 0.4);
}

.farm-tile-3d.hydrated {
  background: #3b82f6 !important;
  border-color: #1d4ed8;
  box-shadow: -4px 6px 0px #1e3a8a, 0 0 15px rgba(59, 130, 246, 0.5);
}

.farm-tile-3d.seeded {
  background: #92400e !important;
}

.farm-tile-3d.sprout {
  background: #15803d !important;
  border-color: #14532d;
}

.farm-tile-3d.mature {
  background: #16a34a !important;
  border-color: #15803d;
  box-shadow: -4px 6px 0px #14532d, 0 0 20px rgba(34, 197, 94, 0.6);
}

.farm-plant-visual {
  font-size: 2.25rem;
  line-height: 1;
  transform-style: preserve-3d;
  transform: translateZ(24px) rotateX(-54deg) rotateZ(32deg); /* Billboarded */
  filter: drop-shadow(-3px 6px 4px rgba(0, 0, 0, 0.4));
  pointer-events: none;
  transition: transform var(--transition-spring);
}

.farm-tile-3d:hover .farm-plant-visual {
  transform: translateZ(32px) rotateX(-54deg) rotateZ(32deg) scale(1.18);
}

.farm-controls-card {
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 2.25rem;
  box-shadow: var(--depth-shadow-3d);
}

.farm-tool-selector {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-block: 1.25rem;
}

.tool-btn-3d {
  padding: 0.65rem 1.15rem;
  border-radius: var(--radius-md);
  background: var(--color-bg);
  border: 2px solid var(--color-border);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all var(--transition-fast);
}

.tool-btn-3d:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.tool-btn-3d.active {
  background: var(--color-primary);
  color: #ffffff;
  border-color: var(--color-primary);
  box-shadow: 0 4px 12px var(--color-primary-glow);
}

.farm-metrics-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.farm-metric-box {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.65rem 0.85rem;
  text-align: center;
}

/* --------------------------------------------------------------------------
   3D Upcoming Games Showcase Cards
   -------------------------------------------------------------------------- */
.games-filter-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 3.5rem;
}

.filter-tab {
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-full);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-text-secondary);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  transition: all var(--transition-fast);
}

.filter-tab:hover {
  background-color: var(--color-surface-hover);
  color: var(--color-text);
}

.filter-tab.active {
  background-color: var(--color-primary);
  color: #ffffff;
  border-color: var(--color-primary);
  box-shadow: 0 6px 16px var(--color-primary-glow);
}

.games-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2.25rem;
  perspective: 1200px;
}

.game-card-3d {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transform-style: preserve-3d;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
  position: relative;
}

.game-card-3d:hover {
  transform: translateY(-8px) rotateX(4deg) rotateY(-3deg);
  box-shadow: var(--depth-shadow-3d);
  border-color: var(--color-border-hover);
}

.game-card-3d.hidden {
  display: none !important;
}

.game-banner {
  height: 180px;
  position: relative;
  display: flex;
  align-items: flex-end;
  padding: 1.25rem;
  overflow: hidden;
  transform-style: preserve-3d;
}

.game-banner-icon {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  width: 52px;
  height: 52px;
  background: rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-md);
  display: grid;
  place-items: center;
  color: #ffffff;
  font-size: 1.75rem;
  transform: translateZ(30px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
}

.game-card-content {
  padding: 1.75rem 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
  transform-style: preserve-3d;
}

.game-meta-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.6rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.game-card-title {
  font-size: 1.35rem;
  font-weight: 850;
  margin-bottom: 0.5rem;
  color: var(--color-text);
  transform: translateZ(20px);
}

.game-card-desc {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.game-card-features {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
}

.feature-pill {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}

.game-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
}

/* --------------------------------------------------------------------------
   Development Roadmap Section (3D Perspective Columns)
   -------------------------------------------------------------------------- */
.roadmap-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.75rem;
  perspective: 1200px;
}

.roadmap-card-3d {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 2.25rem;
  position: relative;
  transform-style: preserve-3d;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.roadmap-card-3d:hover {
  transform: translateY(-6px) translateZ(10px);
  box-shadow: var(--depth-shadow-3d);
}

.roadmap-card-3d.current {
  border: 2px solid var(--color-primary);
  box-shadow: var(--depth-shadow-3d), 0 0 25px var(--color-primary-glow);
}

.roadmap-step-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
}

.step-active {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.step-upcoming {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}

.roadmap-heading {
  font-size: 1.25rem;
  font-weight: 850;
  margin-bottom: 0.75rem;
}

.roadmap-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-top: 1.25rem;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

.roadmap-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

/* --------------------------------------------------------------------------
   FAQ Section
   -------------------------------------------------------------------------- */
.faq-wrap {
  max-width: 800px;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.faq-item:hover {
  border-color: var(--color-border-hover);
  transform: translateY(-1px);
}

.faq-question-btn {
  width: 100%;
  padding: 1.5rem;
  text-align: left;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
  background: none;
}

.faq-icon-arrow {
  transition: transform var(--transition-fast);
  color: var(--color-text-muted);
}

.faq-item.active .faq-icon-arrow {
  transform: rotate(180deg);
  color: var(--color-primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding-inline: 1.5rem;
}

.faq-item.active .faq-answer {
  max-height: 250px;
  padding-bottom: 1.5rem;
}

.faq-answer-inner {
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   Newsletter / Waitlist Banner Card
   -------------------------------------------------------------------------- */
.cta-banner-section {
  padding-bottom: 6rem;
}

.cta-banner-card-3d {
  background: var(--gradient-hero);
  border-radius: var(--radius-xl);
  padding: 4.5rem 2.5rem;
  text-align: center;
  color: #ffffff;
  position: relative;
  overflow: hidden;
  box-shadow: var(--depth-shadow-3d);
  transform-style: preserve-3d;
}

.cta-banner-title {
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 1rem;
}

.cta-banner-desc {
  font-size: 1.15rem;
  color: rgba(255, 255, 255, 0.9);
  max-width: 600px;
  margin-inline: auto;
  margin-bottom: 2rem;
}

.newsletter-form {
  display: flex;
  justify-content: center;
  max-width: 480px;
  margin-inline: auto;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.newsletter-input {
  flex: 1 1 260px;
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  background: #ffffff;
  color: #0f172a;
  font-size: 1rem;
}

.newsletter-input:focus {
  outline: none;
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.4);
}

.form-feedback-msg {
  width: 100%;
  font-size: 0.95rem;
  font-weight: 700;
  margin-top: 0.75rem;
}

/* --------------------------------------------------------------------------
   Site Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding-top: 4.5rem;
  padding-bottom: 2.5rem;
  color: var(--color-text-secondary);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 3.5rem;
  margin-bottom: 3.5rem;
}

.footer-brand-desc {
  margin-top: 1rem;
  font-size: 0.9375rem;
  max-width: 320px;
  line-height: 1.6;
}

.footer-heading {
  font-size: 0.9375rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text);
  margin-bottom: 1.25rem;
}

.footer-nav-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-link {
  font-size: 0.9375rem;
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--color-primary);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   Modal Dialog
   -------------------------------------------------------------------------- */
.game-modal {
  border: none;
  background: transparent;
  padding: 0;
  max-width: 640px;
  width: calc(100% - 2rem);
  margin: auto;
}

.game-modal::backdrop {
  background: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(8px);
}

.modal-content-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--depth-shadow-3d);
  animation: modal-pop 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modal-pop {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

.modal-header-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.modal-title {
  font-size: 1.25rem;
  font-weight: 850;
  color: var(--color-text);
}

.modal-close-btn {
  font-size: 1.5rem;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
}

.modal-close-btn:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

.modal-body {
  padding: 1.75rem 1.5rem;
}

.modal-interactive-stage {
  background: linear-gradient(135deg, #1e1b4b, #2e1065);
  border-radius: var(--radius-lg);
  padding: 2.5rem 1.5rem;
  text-align: center;
  color: #ffffff;
  margin-bottom: 1.5rem;
}

.modal-actions-row {
  display: flex;
  justify-content: flex-end;
  gap: 1rem;
}

/* --------------------------------------------------------------------------
   Responsive Breakpoints
   -------------------------------------------------------------------------- */
@media (max-width: 960px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .chess-interactive-layout,
  .farm-interactive-layout {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1.25rem;
    box-shadow: var(--depth-shadow-3d);
  }
  
  .nav-menu.open {
    display: flex;
  }
  
  .mobile-nav-toggle {
    display: grid;
  }
  
  .hero-headline {
    font-size: 2.25rem;
  }

  .chessboard-3d {
    width: 290px;
    height: 290px;
    transform: rotateX(45deg) rotateZ(-22deg);
  }

  .chess-piece-3d {
    font-size: 2.2rem;
  }

  .farm-grid-3d {
    width: 280px;
    height: 280px;
    transform: rotateX(45deg) rotateZ(-25deg);
  }

  .farm-plant-visual {
    font-size: 1.8rem;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

/* --------------------------------------------------------------------------
   Reduced Motion Preferences
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
    transform: none !important;
  }
}