/* ==========================================================================
   MAZHAR.IN - Design System & Stylesheet
   Syed Mazhar Ali | Senior Physics Trainer & EdTech Developer
   ========================================================================== */

/* --- Google Fonts Import --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:ital,wght@0,400;0,500;0,700;1,400&family=Outfit:wght@500;600;700;800&display=swap');

/* --- CSS Variables / Design Tokens --- */
:root {
  /* Color Palette - Dark Theme (Default) */
  --bg-primary: #090c10;
  --bg-secondary: #0e131b;
  --bg-tertiary: #161e2b;
  --bg-glass: rgba(14, 19, 27, 0.75);
  --bg-glass-card: rgba(22, 30, 43, 0.65);
  --bg-glass-hover: rgba(30, 41, 59, 0.8);
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(255, 255, 255, 0.15);
  --border-highlight: rgba(56, 189, 248, 0.35);
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-accent: #38bdf8;
  
  /* Brand Accents */
  --accent-cyan: #38bdf8;
  --accent-cyan-glow: rgba(56, 189, 248, 0.25);
  --accent-emerald: #10b981;
  --accent-emerald-glow: rgba(16, 185, 129, 0.2);
  --accent-amber: #f59e0b;
  --accent-purple: #a855f7;

  --gradient-accent: linear-gradient(135deg, #38bdf8 0%, #818cf8 50%, #c084fc 100%);
  --gradient-glow: radial-gradient(circle at 50% -20%, rgba(56, 189, 248, 0.15), transparent 70%);
  --gradient-card: linear-gradient(180deg, rgba(255, 255, 255, 0.03) 0%, rgba(255, 255, 255, 0) 100%);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Outfit', var(--font-sans);
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Elevation & Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 12px -2px rgba(0, 0, 0, 0.5), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 12px 32px -4px rgba(0, 0, 0, 0.6), 0 4px 12px -2px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 25px rgba(56, 189, 248, 0.2);

  /* Layout & Spacing */
  --container-max: 1160px;
  --container-prose: 760px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Mode Overrides */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-glass: rgba(255, 255, 255, 0.85);
  --bg-glass-card: rgba(255, 255, 255, 0.9);
  --bg-glass-hover: rgba(241, 245, 249, 0.95);
  
  --border-subtle: rgba(15, 23, 42, 0.08);
  --border-medium: rgba(15, 23, 42, 0.16);
  --border-highlight: rgba(2, 132, 199, 0.3);
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-accent: #0284c7;

  --accent-cyan: #0284c7;
  --accent-cyan-glow: rgba(2, 132, 199, 0.15);
  --accent-emerald: #059669;
  --accent-emerald-glow: rgba(5, 150, 105, 0.15);
  
  --gradient-accent: linear-gradient(135deg, #0284c7 0%, #4f46e5 50%, #9333ea 100%);
  --gradient-glow: radial-gradient(circle at 50% -20%, rgba(2, 132, 199, 0.1), transparent 70%);
  --gradient-card: linear-gradient(180deg, rgba(0, 0, 0, 0.01) 0%, rgba(0, 0, 0, 0) 100%);

  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px -2px rgba(15, 23, 42, 0.08), 0 2px 4px -2px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 12px 32px -4px rgba(15, 23, 42, 0.1), 0 4px 12px -2px rgba(15, 23, 42, 0.05);
  --shadow-glow: 0 0 25px rgba(2, 132, 199, 0.15);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  max-width: 100%;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.65;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  max-width: 100%;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  background-image: var(--gradient-glow);
  background-attachment: fixed;
}

/* Background Subtle Grid Pattern */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  background-image: radial-gradient(var(--border-subtle) 1px, transparent 1px);
  background-size: 28px 28px;
  opacity: 0.6;
  z-index: -1;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  color: var(--text-primary);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.4rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.6rem); }
h4 { font-size: 1.2rem; }

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

a {
  color: var(--text-accent);
  text-decoration: none;
  transition: color var(--transition-fast), border-color var(--transition-fast), opacity var(--transition-fast);
}

a:hover {
  text-decoration: none;
  filter: brightness(1.15);
}

code, pre, .mono {
  font-family: var(--font-mono);
}

/* --- Layout Containers --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.container-prose {
  max-width: var(--container-prose);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* --- Navigation Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: border-color var(--transition-normal), background var(--transition-normal);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-primary);
  letter-spacing: -0.03em;
}

.logo-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-emerald));
  color: #090c10;
  border-radius: var(--radius-sm);
  font-weight: 800;
  font-size: 0.85rem;
}

.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 1.75rem;
}

.nav-link {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
  padding: 0.25rem 0;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--accent-cyan);
  border-radius: 2px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-shrink: 0;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  border-color: var(--border-highlight);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.theme-toggle-btn svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Launch CTA Button */
.btn-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--gradient-accent);
  color: #ffffff;
  font-family: var(--font-mono);
  font-size: 0.825rem;
  font-weight: 700;
  padding: 0.6rem 1.15rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  box-shadow: 0 4px 14px -2px rgba(56, 189, 248, 0.35);
  transition: all var(--transition-normal);
  white-space: nowrap;
}

.btn-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px -2px rgba(56, 189, 248, 0.5);
  color: #ffffff;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-glass-card);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
  font-family: var(--font-mono);
  font-size: 0.825rem;
  font-weight: 600;
  padding: 0.6rem 1.15rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-highlight);
  color: var(--text-primary);
  transform: translateY(-2px);
}

/* Mobile Nav Toggle */
.mobile-nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.mobile-nav-toggle:hover,
.mobile-nav-toggle:focus-visible {
  border-color: var(--border-highlight);
  color: var(--accent-cyan);
  outline: none;
}

.mobile-nav-toggle svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  display: block;
}

.mobile-nav-cta {
  display: none;
}

/* --- Hero Section --- */
.hero-section {
  padding: 5rem 0 4rem;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1.25rem;
}

.kicker-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  background: var(--bg-glass-card);
  border: 1px solid var(--border-highlight);
  font-family: var(--font-mono);
  font-size: 0.775rem;
  color: var(--accent-cyan);
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

.pulse-dot {
  width: 7px;
  height: 7px;
  background-color: var(--accent-emerald);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-emerald);
  animation: pulseAnimation 2s infinite ease-in-out;
}

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

.hero-headline {
  font-size: clamp(2.3rem, 4.5vw, 3.4rem);
  font-weight: 800;
  line-height: 1.15;
  color: var(--text-primary);
}

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

.hero-subheadline {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 600px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 0.75rem;
}

/* Interactive Hero Sidecard & Simulation */
.hero-visual {
  position: relative;
}

.sim-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(16px);
  position: relative;
  overflow: hidden;
  transition: border-color var(--transition-normal);
}

.sim-card:hover {
  border-color: var(--border-highlight);
}

.sim-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.85rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-subtle);
}

.sim-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.sim-status {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent-emerald);
  background: rgba(16, 185, 129, 0.12);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
}

.sim-canvas-wrap {
  position: relative;
  width: 100%;
  height: 240px;
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  overflow: hidden;
  cursor: crosshair;
}

#physicsCanvas {
  width: 100%;
  height: 100%;
  display: block;
}

.sim-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.sim-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.725rem;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.sim-btn:hover {
  border-color: var(--border-highlight);
  color: var(--text-primary);
}

/* --- Section Dividers & General Structure --- */
section {
  padding: 4.5rem 0;
  position: relative;
}

.section-kicker {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 700;
  margin-bottom: 0.5rem;
  display: block;
}

.section-title {
  margin-bottom: 1rem;
}

.section-desc {
  max-width: 640px;
  margin-bottom: 2.75rem;
  font-size: 1.05rem;
}

/* --- Dual-Core Focus Section --- */
.dual-focus-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.focus-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  backdrop-filter: blur(12px);
  position: relative;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.focus-card:hover {
  border-color: var(--border-highlight);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.focus-icon-wrap {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-medium);
  color: var(--accent-cyan);
}

.focus-icon-wrap.accent-emerald {
  color: var(--accent-emerald);
}

.focus-card h3 {
  margin-bottom: 0.85rem;
  font-size: 1.45rem;
}

.focus-list {
  list-style: none;
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.focus-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.925rem;
  color: var(--text-secondary);
}

.focus-list li svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-top: 0.2rem;
  color: var(--accent-cyan);
}

.focus-list li.emerald svg {
  color: var(--accent-emerald);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 1.75rem;
}

.project-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(12px);
  transition: all var(--transition-normal);
  position: relative;
}

.project-card:hover {
  border-color: var(--border-highlight);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.project-header-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.project-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.1);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.project-live-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--accent-emerald);
  background: rgba(16, 185, 129, 0.1);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
}

.project-title {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

.project-desc {
  font-size: 0.925rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.project-footer {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--border-subtle);
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.tech-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  background: var(--bg-tertiary);
  padding: 0.18rem 0.5rem;
  border-radius: var(--radius-sm);
}

.project-launch-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-medium);
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: all var(--transition-fast);
  align-self: flex-start;
}

.project-launch-btn:hover {
  background: var(--accent-cyan);
  color: #090c10;
  border-color: var(--accent-cyan);
  transform: translateX(2px);
}

/* Social Bar & Pills */
.social-links-bar {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
  margin-top: 0.5rem;
}

.social-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  background: var(--bg-glass-card);
  border: 1px solid var(--border-subtle);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.social-pill svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

.social-pill:hover {
  color: var(--text-primary);
  border-color: var(--border-highlight);
  background: var(--bg-glass-hover);
  transform: translateY(-1px);
}

/* --- Flagship Callout Card (SMA Physics) --- */
.flagship-banner {
  background: linear-gradient(135deg, rgba(14, 23, 42, 0.9) 0%, rgba(15, 33, 55, 0.9) 100%);
  border: 1px solid rgba(56, 189, 248, 0.35);
  border-radius: var(--radius-lg);
  padding: 3rem;
  position: relative;
  overflow: hidden;
  box-shadow: 0 10px 40px -10px rgba(56, 189, 248, 0.25);
  margin-top: 1rem;
}

[data-theme="light"] .flagship-banner {
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  border: 1px solid rgba(2, 132, 199, 0.3);
}

.flagship-banner::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 350px;
  height: 350px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.flagship-content {
  display: grid;
  grid-template-columns: 1.35fr 0.65fr;
  gap: 2.5rem;
  align-items: center;
  position: relative;
  z-index: 2;
}

.flagship-kicker {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-cyan);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

.flagship-title {
  font-size: clamp(1.75rem, 3vw, 2.35rem);
  margin-bottom: 1rem;
}

.flagship-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 1.5rem;
}

.flagship-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.75rem;
}

.feature-pill {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.feature-pill svg {
  color: var(--accent-cyan);
  width: 15px;
  height: 15px;
}

.flagship-action-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  background: var(--bg-glass-card);
  padding: 2rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-medium);
  text-align: center;
  backdrop-filter: blur(8px);
}

.flagship-domain {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

/* --- Articles & Blog Preview Section --- */
.articles-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.article-row {
  display: grid;
  grid-template-columns: 140px 1fr auto;
  gap: 2rem;
  align-items: center;
  background: var(--bg-glass-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.75rem;
  transition: all var(--transition-normal);
  text-decoration: none;
}

.article-row:hover {
  border-color: var(--border-highlight);
  background: var(--bg-glass-hover);
  transform: translateX(4px);
}

.article-meta-date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.article-info h3 {
  font-size: 1.2rem;
  margin-bottom: 0.4rem;
  color: var(--text-primary);
  transition: color var(--transition-fast);
}

.article-row:hover .article-info h3 {
  color: var(--accent-cyan);
}

.article-summary {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

.article-tags-wrap {
  display: flex;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.tag-badge {
  font-family: var(--font-mono);
  font-size: 0.725rem;
  color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.2);
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
}

/* --- Blog Post Layout & KaTeX Typography --- */
.post-header {
  padding: 4rem 0 2.5rem;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 3rem;
}

.post-back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.825rem;
  color: var(--text-muted);
  margin-bottom: 1.75rem;
  transition: color var(--transition-fast);
}

.post-back-link:hover {
  color: var(--text-primary);
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.825rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.post-title {
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.2;
  margin-bottom: 1rem;
}

.post-lead {
  font-size: 1.2rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Prose Markdown Content Styling */
.prose {
  font-size: 1.075rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.prose p {
  margin-bottom: 1.6rem;
  color: var(--text-secondary);
}

.prose h2 {
  font-size: 1.85rem;
  margin-top: 2.75rem;
  margin-bottom: 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border-subtle);
}

.prose h3 {
  font-size: 1.4rem;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.prose strong {
  color: var(--text-primary);
  font-weight: 600;
}

.prose ul, .prose ol {
  margin-bottom: 1.6rem;
  padding-left: 1.5rem;
}

.prose li {
  margin-bottom: 0.5rem;
}

.prose blockquote {
  border-left: 3px solid var(--accent-cyan);
  background: var(--bg-glass-card);
  padding: 1.25rem 1.5rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 2rem 0;
  color: var(--text-primary);
  font-style: italic;
}

.prose blockquote p:last-child {
  margin-bottom: 0;
}

.prose pre {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  margin: 2rem 0;
  line-height: 1.55;
  color: #e2e8f0;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  padding: 0.15rem 0.4rem;
  border-radius: var(--radius-sm);
  color: var(--accent-cyan);
}

.prose pre code {
  background: transparent;
  border: none;
  padding: 0;
  color: inherit;
}

/* KaTeX Overrides for Seamless Responsive Math */
.katex-display {
  margin: 1.75rem 0 !important;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 1rem 0.5rem;
  background: var(--bg-glass-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.katex {
  font-size: 1.1em !important;
  color: var(--text-primary) !important;
}

/* --- Footer --- */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-secondary);
  padding: 4.5rem 0 2.5rem;
  margin-top: 5rem;
}

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

.footer-brand h4 {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  margin-bottom: 0.75rem;
}

.footer-brand p {
  font-size: 0.925rem;
  color: var(--text-muted);
  max-width: 360px;
  line-height: 1.6;
}

.footer-links-col h5 {
  font-family: var(--font-mono);
  font-size: 0.825rem;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1.2rem;
}

.footer-links-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-links-col a {
  font-size: 0.9rem;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.footer-links-col a:hover {
  color: var(--accent-cyan);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* --- Responsive Media Queries --- */
@media (max-width: 960px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  
  .dual-focus-grid {
    grid-template-columns: 1fr;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .flagship-content {
    grid-template-columns: 1fr;
  }

  .article-row {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .container, .container-prose {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .site-header {
    position: sticky;
    top: 0;
  }

  .header-inner {
    position: relative;
    height: 4rem;
  }

  .header-actions .btn-cta {
    display: none !important;
  }

  .mobile-nav-toggle {
    display: inline-flex !important;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    width: 100%;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-subtle);
    padding: 1rem 1rem 1.25rem;
    flex-direction: column;
    align-items: stretch;
    gap: 0.35rem;
    box-shadow: 0 12px 32px -4px rgba(0, 0, 0, 0.4);
    z-index: 1000;
  }

  .nav-menu.open {
    display: flex;
  }

  .nav-menu li {
    width: 100%;
    list-style: none;
  }

  .nav-menu .nav-link {
    display: block;
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
  }

  .nav-menu .nav-link:hover,
  .nav-menu .nav-link:focus,
  .nav-menu .nav-link.active {
    background: var(--bg-tertiary);
    color: var(--text-primary);
  }

  .nav-menu .nav-link.active::after {
    display: none;
  }

  .mobile-nav-cta {
    display: block !important;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border-subtle);
    margin-top: 0.35rem;
  }

  .mobile-nav-cta .btn-cta {
    display: flex !important;
    justify-content: center;
    width: 100%;
    text-align: center;
    padding: 0.75rem 1rem;
    box-sizing: border-box;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .site-logo {
    font-size: 1.05rem;
    gap: 0.5rem;
  }

  .hero-actions a {
    width: 100%;
    justify-content: center;
  }
}

/* --- Print Styles --- */
@media print {
  body {
    background: #ffffff !important;
    color: #000000 !important;
  }
  .site-header, .site-footer, .theme-toggle-btn, .sim-card, .btn-cta {
    display: none !important;
  }
  .container, .container-prose {
    max-width: 100% !important;
    padding: 0 !important;
  }
}