@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&family=Fira+Code:wght@400;500&display=swap');

/* --- DESIGN SYSTEM TOKENS --- */
:root {
  /* Color Palette */
  --bg-darker: #070a13;
  --bg-dark: #0d1222;
  --bg-card: rgba(22, 28, 45, 0.65);
  --bg-card-hover: rgba(30, 41, 67, 0.85);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(255, 255, 255, 0.25);
  
  /* Fields Colors & Glows */
  --color-thermal: #ff5252;
  --color-thermal-glow: rgba(255, 82, 82, 0.25);
  --color-hydro: #00d2d3;
  --color-hydro-glow: rgba(0, 210, 211, 0.25);
  --color-mech: #a29bfe;
  --color-mech-glow: rgba(162, 155, 254, 0.25);
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  /* Gradients */
  --gradient-hero: linear-gradient(135deg, #070a13 0%, #0d1222 100%);
  --gradient-thermal: linear-gradient(135deg, #ff5252 0%, #ff7979 100%);
  --gradient-hydro: linear-gradient(135deg, #00d2d3 0%, #00a8ff 100%);
  --gradient-mech: linear-gradient(135deg, #a29bfe 0%, #6c5ce7 100%);
  --gradient-accent: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
  
  /* Fonts */
  --font-header: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'Fira Code', monospace;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Shadows */
  --shadow-sm: 0 2px 8px -1px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 16px -6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 40px -15px rgba(0, 0, 0, 0.6);
  --shadow-thermal: 0 8px 20px -4px var(--color-thermal-glow);
  --shadow-hydro: 0 8px 20px -4px var(--color-hydro-glow);
  --shadow-mech: 0 8px 20px -4px var(--color-mech-glow);
}

/* --- RESET & BASE STYLES --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-darker);
  color: var(--text-primary);
}

body {
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
  background: radial-gradient(circle at 50% 0%, #172037 0%, var(--bg-darker) 70%);
  min-height: 100vh;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg-darker);
}
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 5px;
  border: 2px solid var(--bg-darker);
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* --- TYPOGRAPHY --- */
h1, h2, h3, h4 {
  font-family: var(--font-header);
  font-weight: 700;
  letter-spacing: -0.02em;
}

p {
  color: var(--text-secondary);
}

a {
  color: var(--color-hydro);
  text-decoration: none;
  transition: var(--transition-fast);
}
a:hover {
  filter: brightness(1.2);
}

/* --- UTILITY CLASSES --- */
.container {
  width: 90%;
  max-width: 1300px;
  margin: 0 auto;
  padding: 0 1rem;
}

.glass-panel {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}
.glass-panel:hover {
  border-color: var(--border-focus);
}

.text-gradient {
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.grad-thermal { background-image: var(--gradient-thermal); }
.grad-hydro { background-image: var(--gradient-hydro); }
.grad-mech { background-image: var(--gradient-mech); }
.grad-accent { background-image: var(--gradient-accent); }

/* --- HEADER / NAVIGATION --- */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 80px;
  z-index: 100;
  background: rgba(7, 10, 19, 0.7);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
}

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

.logo {
  font-family: var(--font-header);
  font-weight: 800;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.logo span {
  font-size: 0.8rem;
  background: rgba(255, 255, 255, 0.1);
  padding: 0.2rem 0.5rem;
  border-radius: 6px;
  font-weight: 500;
  color: var(--text-secondary);
}

nav ul {
  display: flex;
  list-style: none;
  gap: 2rem;
}

nav a {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text-secondary);
  position: relative;
  padding: 0.25rem 0;
}
nav a:hover, nav a.active {
  color: var(--text-primary);
}
nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-accent);
  transition: var(--transition-fast);
}
nav a:hover::after, nav a.active::after {
  width: 100%;
}

/* --- HERO SECTION --- */
.hero {
  padding-top: 180px;
  padding-bottom: 100px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-bg-glow {
  position: absolute;
  top: 10%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 300px;
  background: radial-gradient(ellipse at center, rgba(99, 102, 241, 0.15) 0%, rgba(99, 102, 241, 0) 70%);
  z-index: -1;
  pointer-events: none;
}

.hero h1 {
  font-size: 3.5rem;
  line-height: 1.15;
  margin-bottom: 1.5rem;
  font-weight: 800;
}

.hero p {
  font-size: 1.25rem;
  max-width: 800px;
  margin: 0 auto 2.5rem;
  color: var(--text-secondary);
}

.hero-cta {
  display: flex;
  justify-content: center;
  gap: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.8rem;
  font-family: var(--font-header);
  font-weight: 600;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: var(--transition-fast);
  font-size: 1rem;
  gap: 0.5rem;
}

.btn-primary {
  background: var(--gradient-accent);
  color: var(--text-primary);
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.6);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border: 1px solid rgba(255, 255, 255, 0.1);
}
.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

/* Micro Porous Interactive Node in Hero */
.hero-interactive {
  margin-top: 4rem;
  display: flex;
  justify-content: center;
}
.micro-node-container {
  position: relative;
  width: 100%;
  max-width: 700px;
  height: 220px;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  background: rgba(13, 18, 34, 0.8);
}
.micro-canvas-label {
  position: absolute;
  top: 10px;
  left: 15px;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  pointer-events: none;
}
.micro-canvas-instruction {
  position: absolute;
  bottom: 10px;
  right: 15px;
  font-size: 0.75rem;
  color: var(--text-secondary);
  background: rgba(0,0,0,0.4);
  padding: 2px 8px;
  border-radius: 4px;
  pointer-events: none;
}

/* --- SECTION GENERAL STYLES --- */
section {
  padding: 80px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.03);
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-header h2 {
  font-size: 2.25rem;
  margin-bottom: 1rem;
}

.section-header p {
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* --- COUPLING MATRIX SECTION --- */
.matrix-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

/* 3x3 Grid design for Coupling Matrix */
.matrix-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 12px;
  aspect-ratio: 1;
  max-width: 450px;
  width: 100%;
  margin: 0 auto;
}

.matrix-cell {
  aspect-ratio: 1;
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  position: relative;
  transition: var(--transition-normal);
  font-family: var(--font-header);
}

/* Diagonals - Self Fields */
.cell-self {
  font-weight: 700;
  font-size: 1.4rem;
  border-width: 2px;
}
.cell-t {
  border: 2px solid var(--color-thermal);
  background: rgba(255, 82, 82, 0.07);
  color: var(--color-thermal);
  box-shadow: inset 0 0 15px rgba(255, 82, 82, 0.1);
}
.cell-h {
  border: 2px solid var(--color-hydro);
  background: rgba(0, 210, 211, 0.07);
  color: var(--color-hydro);
  box-shadow: inset 0 0 15px rgba(0, 210, 211, 0.1);
}
.cell-m {
  border: 2px solid var(--color-mech);
  background: rgba(162, 155, 254, 0.07);
  color: var(--color-mech);
  box-shadow: inset 0 0 15px rgba(162, 155, 254, 0.1);
}

/* Off-diagonals - Couplings */
.cell-coupling {
  border: 1px solid var(--border-color);
  background: rgba(255, 255, 255, 0.02);
  color: var(--text-secondary);
}
.cell-coupling .arrow {
  font-size: 1.2rem;
  margin-top: 2px;
  opacity: 0.7;
}
.cell-coupling .label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  text-align: center;
  margin-top: 4px;
}

.cell-coupling:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--text-secondary);
  color: var(--text-primary);
  transform: translateY(-2px);
}

.cell-coupling.active {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
  transform: scale(1.03);
}

/* Highlight dynamic border colors on selection */
.cell-coupling.t-h.active, .cell-coupling.t-h:hover { border-color: #ff9f43; box-shadow: 0 0 10px rgba(255, 159, 67, 0.3); } /* Orange/Warm */
.cell-coupling.t-m.active, .cell-coupling.t-m:hover { border-color: #ff6b6b; box-shadow: 0 0 10px rgba(255, 107, 107, 0.3); } /* Red */
.cell-coupling.h-t.active, .cell-coupling.h-t:hover { border-color: #1dd1a1; box-shadow: 0 0 10px rgba(29, 209, 161, 0.3); } /* Teal */
.cell-coupling.h-m.active, .cell-coupling.h-m:hover { border-color: #0abde3; box-shadow: 0 0 10px rgba(10, 190, 227, 0.3); } /* Sky */
.cell-coupling.m-t.active, .cell-coupling.m-t:hover { border-color: #e056fd; box-shadow: 0 0 10px rgba(224, 86, 253, 0.3); } /* Fuchsia */
.cell-coupling.m-h.active, .cell-coupling.m-h:hover { border-color: #5f27cd; box-shadow: 0 0 10px rgba(95, 39, 205, 0.3); } /* Indigo */

/* Matrix explanation detail display */
.matrix-detail {
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 380px;
}

.matrix-detail-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  height: 100%;
}
.matrix-detail-placeholder svg {
  margin-bottom: 1.5rem;
  color: var(--text-muted);
  animation: pulse-slow 3s infinite ease-in-out;
}

.matrix-detail-content {
  display: none;
}
.matrix-detail-content.active {
  display: block;
  animation: fade-in-up 0.4s ease-out forwards;
}

.detail-badge {
  display: inline-block;
  padding: 0.3rem 0.8rem;
  border-radius: 30px;
  font-family: var(--font-header);
  font-weight: 600;
  font-size: 0.8rem;
  margin-bottom: 1.2rem;
  border: 1px solid transparent;
}
.badge-t-h { background: rgba(255, 159, 67, 0.1); border-color: rgba(255, 159, 67, 0.3); color: #ff9f43; }
.badge-t-m { background: rgba(255, 82, 82, 0.1); border-color: rgba(255, 82, 82, 0.3); color: #ff5252; }
.badge-h-t { background: rgba(29, 209, 161, 0.1); border-color: rgba(29, 209, 161, 0.3); color: #1dd1a1; }
.badge-h-m { background: rgba(10, 190, 227, 0.1); border-color: rgba(10, 190, 227, 0.3); color: #0abde3; }
.badge-m-t { background: rgba(224, 86, 253, 0.1); border-color: rgba(224, 86, 253, 0.3); color: #e056fd; }
.badge-m-h { background: rgba(95, 39, 205, 0.1); border-color: rgba(95, 39, 205, 0.3); color: #a29bfe; }

.detail-title {
  font-size: 1.8rem;
  margin-bottom: 1rem;
}

.detail-description {
  margin-bottom: 1.5rem;
  font-size: 1.05rem;
  color: var(--text-secondary);
}

.detail-equation-box {
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border-color);
  padding: 1.2rem;
  border-radius: 8px;
  margin-bottom: 1.5rem;
  overflow-x: auto;
  font-family: var(--font-mono);
}

.detail-example-title {
  font-family: var(--font-header);
  font-weight: 600;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.detail-example {
  font-size: 0.95rem;
  color: var(--text-secondary);
  border-left: 2px solid var(--color-hydro);
  padding-left: 10px;
}

/* --- INTERACTIVE SIMULATION LAB --- */
.lab-selector {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3rem;
}

.lab-tab {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 0.75rem 1.5rem;
  border-radius: 30px;
  cursor: pointer;
  font-family: var(--font-header);
  font-weight: 600;
  color: var(--text-secondary);
  transition: var(--transition-fast);
}
.lab-tab:hover {
  border-color: var(--border-focus);
  color: var(--text-primary);
}
.lab-tab.active {
  background: var(--text-primary);
  color: var(--bg-darker);
  border-color: var(--text-primary);
  box-shadow: 0 4px 15px rgba(255, 255, 255, 0.15);
}

/* Lab Simulator Interface Panel */
.simulator-panel {
  display: none;
  grid-template-columns: 1.3fr 1fr;
  gap: 2rem;
}
.simulator-panel.active {
  display: grid;
}

/* Canvas Viewport */
.sim-viewport {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  background: #080b12;
  box-shadow: inset 0 0 30px rgba(0, 0, 0, 0.6);
  display: flex;
  flex-direction: column;
  min-height: 480px;
}
.sim-viewport canvas {
  width: 100%;
  flex-grow: 1;
  background-color: transparent;
  display: block;
}
.sim-viewport-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  background: rgba(0,0,0,0.3);
}
.sim-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.sim-status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}
.status-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #ff5252;
}
.status-indicator.running {
  background: #1dd1a1;
  box-shadow: 0 0 8px #1dd1a1;
  animation: blink 1.5s infinite alternate;
}

/* Sim Controls Panel */
.sim-controls {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.sim-controls h3 {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}
.sim-controls-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1rem;
}

.control-group {
  margin-bottom: 1.5rem;
}
.control-label {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-header);
  font-weight: 500;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}
.control-val {
  font-family: var(--font-mono);
  color: var(--text-primary);
  font-weight: 600;
}

/* Styled Slider inputs */
input[type="range"].styled-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: rgba(255,255,255,0.1);
  outline: none;
}
input[type="range"].styled-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--text-primary);
  cursor: pointer;
  box-shadow: 0 0 10px rgba(0,0,0,0.5);
  transition: transform 0.1s;
}
input[type="range"].styled-slider::-webkit-slider-thumb:hover {
  transform: scale(1.25);
}

.sim-buttons {
  display: flex;
  gap: 0.8rem;
  margin-top: 1.5rem;
}
.sim-btn {
  flex: 1;
  padding: 0.7rem;
  border-radius: 8px;
  font-family: var(--font-header);
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  font-size: 0.9rem;
}
.sim-btn-play {
  background: var(--gradient-accent);
  color: var(--text-primary);
}
.sim-btn-play:hover {
  filter: brightness(1.1);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}
.sim-btn-reset {
  background: rgba(255,255,255,0.05);
  color: var(--text-secondary);
  border-color: rgba(255,255,255,0.08);
}
.sim-btn-reset:hover {
  background: rgba(255,255,255,0.1);
  color: var(--text-primary);
}

/* Simulation Monitors */
.sim-monitors {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-top: 1.5rem;
}
.monitor-card {
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-color);
  padding: 0.75rem;
  border-radius: 8px;
}
.monitor-lbl {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  font-family: var(--font-header);
}
.monitor-val {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Custom styles for specific labs */
.lab-h-accent .styled-slider::-webkit-slider-thumb {
  background: var(--color-hydro);
}
.lab-t-accent .styled-slider::-webkit-slider-thumb {
  background: var(--color-thermal);
}
.lab-m-accent .styled-slider::-webkit-slider-thumb {
  background: var(--color-mech);
}

/* --- MATHEMATICAL FORMULATION --- */
.math-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-bottom: 3rem;
}

.math-card {
  padding: 2.2rem;
  position: relative;
  overflow: hidden;
}
.math-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
}
.math-card.t-card::before { background: var(--color-thermal); }
.math-card.h-card::before { background: var(--color-hydro); }
.math-card.m-card::before { background: var(--color-mech); }
.math-card.coupled-card::before { background: var(--gradient-accent); }

.math-card h3 {
  font-size: 1.4rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.math-card p {
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}

.equation-display {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.2rem;
  margin: 1rem 0;
  overflow-x: auto;
  text-align: center;
  font-size: 1.1rem;
}

.variables-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-color);
  padding-top: 1rem;
}
.var-item {
  display: flex;
  gap: 0.5rem;
}
.var-sym {
  font-family: var(--font-mono);
  color: var(--text-primary);
  font-weight: 600;
}

/* --- PRACTICAL APPLICATIONS --- */
.apps-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.app-card {
  padding: 2rem;
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
}

.app-icon {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  width: 50px;
  height: 50px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--color-hydro);
}

.app-card:nth-child(2) .app-icon { color: var(--color-thermal); }
.app-card:nth-child(3) .app-icon { color: var(--color-mech); }
.app-card:nth-child(4) .app-icon { color: #fdcb6e; }

.app-content h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}
.app-content p {
  font-size: 0.95rem;
}

/* --- FOOTER --- */
footer {
  padding: 4rem 0;
  background: var(--bg-darker);
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-logo {
  font-family: var(--font-header);
  font-weight: 700;
  color: var(--text-primary);
}

/* --- ANIMATIONS --- */
@keyframes blink {
  0% { opacity: 0.4; }
  100% { opacity: 1; }
}

@keyframes pulse-slow {
  0%, 100% { opacity: 0.4; transform: scale(1); }
  50% { opacity: 0.8; transform: scale(1.05); }
}

@keyframes fade-in-up {
  from {
    opacity: 0;
    transform: translateY(15px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- RESPONSIVE MEDIA QUERIES --- */
@media (max-width: 1024px) {
  .simulator-panel {
    grid-template-columns: 1fr;
  }
  .matrix-container {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .math-grid {
    grid-template-columns: 1fr;
  }
  .apps-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  header {
    height: 70px;
  }
  .hero h1 {
    font-size: 2.5rem;
  }
  .hero p {
    font-size: 1.1rem;
  }
  nav ul {
    gap: 1rem;
  }
  section {
    padding: 60px 0;
  }
  .sim-controls {
    padding: 1.5rem 1rem;
  }
  .matrix-grid {
    max-width: 350px;
  }
}