/* ==========================================================================
   UPAMADA EKANAYAKE — AI ENGINEERING & ML DEVELOPER PORTFOLIO
   Design System: "Editorial Cybernetic" — Red, Pitch Black, Neutral Grays & Crisp White
   Supports Dynamic Light Mode (Default) & Dark Mode via [data-theme]
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600&family=Space+Grotesk:wght@400;500;600;700&display=swap');

:root {
  /* Default: LIGHT MODE (Red, Black, Gray, White) */
  --bg-pitch: #f8fafc;
  --bg-surface: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.88);
  --bg-card-hover: #ffffff;
  --bg-glass-pill: rgba(0, 0, 0, 0.04);
  --bg-header-scrolled: rgba(248, 250, 252, 0.85);

  /* Chromatic Accents */
  --red-primary: #ef4444;
  --red-bright: #dc2626;
  --red-dark: #991b1b;
  --red-glow: rgba(239, 68, 68, 0.25);
  
  --black-primary: #09090b;
  --black-secondary: #18181b;
  --black-soft: #27272a;
  
  --gray-light: #f1f5f9;
  --gray-border: #e2e8f0;
  --gray-slate: #64748b;
  --gray-dark: #334155;

  /* Gradients */
  --gradient-blue-red: linear-gradient(135deg, #09090b 10%, #dc2626 90%);
  --gradient-btn-primary: linear-gradient(135deg, #dc2626 0%, #18181b 100%);
  --gradient-text-hero: linear-gradient(135deg, #09090b 20%, #18181b 65%, #dc2626 100%);
  --gradient-border-glow: linear-gradient(135deg, rgba(220, 38, 38, 0.35), rgba(9, 9, 11, 0.2));

  /* Typography Colors */
  --text-white: #09090b; /* Headings: Stark Jet Black */
  --text-primary: #18181b; /* Body: Crisp Dark Charcoal */
  --text-secondary: #475569; /* Descriptions: Slate Gray */
  --text-muted: #64748b; /* Captions: Neutral Gray */
  
  /* Borders */
  --border-subtle: #e2e8f0;
  --border-glass: #cbd5e1;
  --border-glow-blue: rgba(9, 9, 11, 0.25);
  --border-glow-red: rgba(220, 38, 38, 0.4);

  /* Fonts */
  --font-display: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Shadows & Glass */
  --glass-blur: blur(16px);
  --box-shadow-card: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.03);
  --box-shadow-glow: 0 15px 35px rgba(220, 38, 38, 0.15), 0 5px 15px rgba(0, 0, 0, 0.06);

  /* Dimensions */
  --header-height: 76px;
  --max-width: 1240px;
}

/* Dark Mode Theme Tokens */
[data-theme="dark"] {
  --bg-pitch: #06070a;
  --bg-surface: #0a0c13;
  --bg-card: rgba(13, 16, 26, 0.75);
  --bg-card-hover: rgba(19, 23, 38, 0.85);
  --bg-glass-pill: rgba(255, 255, 255, 0.04);
  --bg-header-scrolled: rgba(6, 7, 10, 0.8);

  --red-primary: #ef4444;
  --red-bright: #f87171;
  --red-dark: #b91c1c;
  --red-glow: rgba(239, 68, 68, 0.35);

  --black-primary: #ffffff;
  --black-secondary: #0f172a;
  --black-soft: #1e293b;

  --gray-light: rgba(255, 255, 255, 0.07);
  --gray-border: rgba(255, 255, 255, 0.12);
  --gray-slate: #94a3b8;
  --gray-dark: #cbd5e1;

  --text-white: #ffffff;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-glass: rgba(255, 255, 255, 0.12);
  --border-glow-blue: rgba(59, 130, 246, 0.4);
  --border-glow-red: rgba(239, 68, 68, 0.4);

  --gradient-blue-red: linear-gradient(135deg, #3b82f6 0%, #ec4899 50%, #ef4444 100%);
  --gradient-btn-primary: linear-gradient(135deg, #2563eb 0%, #dc2626 100%);
  --gradient-text-hero: linear-gradient(135deg, #ffffff 30%, #60a5fa 70%, #f87171 100%);
  --gradient-border-glow: linear-gradient(135deg, rgba(59, 130, 246, 0.45), rgba(239, 68, 68, 0.45));

  --box-shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.6);
  --box-shadow-glow: 0 0 25px rgba(59, 130, 246, 0.2), 0 0 50px rgba(239, 68, 68, 0.15);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-pitch);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-pitch);
}
::-webkit-scrollbar-thumb {
  background: var(--border-glass);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--red-primary);
}

/* Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 2;
}

/* Typography Presets */
h1, h2, h3, h4, .font-display {
  font-family: var(--font-display);
  letter-spacing: -0.02em;
  font-weight: 700;
  color: var(--text-white);
}

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

.gradient-text {
  background: var(--gradient-blue-red);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

/* ==========================================================================
   HEADER & FLOATING NAVIGATION
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  padding: 16px 24px;
  transition: all 0.3s ease;
}

.site-header.scrolled {
  padding: 10px 24px;
  background: var(--bg-header-scrolled);
  backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--border-subtle);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
}

.nav-wrapper {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-white);
}

.brand-symbol {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--black-primary);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  color: #fff;
}

.brand-symbol svg {
  width: 20px;
  height: 20px;
}

.brand-info {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.brand-sub {
  font-size: 10px;
  font-family: var(--font-mono);
  color: var(--text-muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* Floating Pill Nav */
.floating-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  padding: 6px 24px;
  border-radius: 9999px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.nav-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  transition: all 0.2s ease;
  position: relative;
  padding: 4px 0;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--red-bright);
  transition: all 0.25s ease;
  transform: translateX(-50%);
  border-radius: 2px;
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

/* Header Actions & Theme Switcher */
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.theme-toggle-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.25s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.theme-toggle-btn:hover {
  border-color: var(--red-bright);
  color: var(--red-bright);
  transform: scale(1.05);
}

.btn-pill-header {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--black-primary);
  border: 1px solid var(--black-primary);
  color: #ffffff;
  padding: 8px 18px;
  border-radius: 9999px;
  font-size: 12px;
  font-weight: 600;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  transition: all 0.25s ease;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.btn-pill-header:hover {
  background: var(--red-bright);
  border-color: var(--red-bright);
  box-shadow: 0 4px 15px rgba(220, 38, 38, 0.3);
  transform: translateY(-1px);
}

/* ==========================================================================
   BUTTONS & BADGES
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 28px;
  border-radius: 9999px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  border: none;
  position: relative;
  overflow: hidden;
}

.btn-primary-gradient {
  background: var(--gradient-btn-primary);
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(220, 38, 38, 0.3);
}

.btn-primary-gradient:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(220, 38, 38, 0.45);
}

.btn-arrow-circle {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s ease;
}

.btn-primary-gradient:hover .btn-arrow-circle {
  transform: translateX(3px);
}

.btn-glass-secondary {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  backdrop-filter: var(--glass-blur);
  box-shadow: 0 2px 10px rgba(0,0,0,0.03);
}

.btn-glass-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--black-primary);
  color: var(--black-primary);
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(0,0,0,0.08);
}

.pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  padding: 6px 14px;
  border-radius: 9999px;
  font-size: 11px;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

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

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

.section-eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--red-bright);
  margin-bottom: 16px;
}

.section-eyebrow::before {
  content: '';
  width: 24px;
  height: 2px;
  background: var(--red-bright);
}

/* ==========================================================================
   HERO SECTION & VIDEO / ORB CENTERPIECE
   ========================================================================== */
.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: calc(var(--header-height) + 40px);
  padding-bottom: 60px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  position: relative;
  z-index: 3;
}

.hero-badge-row {
  margin-bottom: 20px;
  position: relative;
  z-index: 3;
}

.hero-title {
  font-size: clamp(38px, 5.2vw, 68px);
  line-height: 1.05;
  margin-bottom: 24px;
  text-transform: uppercase;
  color: var(--text-white);
  position: relative;
  z-index: 3;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, #09090b 10%, #18181b 25%, #dc2626 75%, #ef4444 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

[data-theme="dark"] .hero-title .gradient-text {
  background: linear-gradient(135deg, #ffffff 15%, #60a5fa 65%, #f87171 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-description {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.65;
  max-width: 580px;
  margin-bottom: 36px;
}

.hero-description strong {
  color: var(--text-white);
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 48px;
}

/* Telemetry Stats Bar */
.telemetry-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  padding-top: 32px;
  border-top: 1px solid var(--border-subtle);
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-value {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  color: var(--text-white);
  line-height: 1.1;
}

.stat-label {
  font-size: 10px;
  font-family: var(--font-mono);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 4px;
}

/* Hero Centerpiece / Spatial Cyber Viewport & Video Player */
.hero-visual-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  perspective: 1200px;
}

.hero-centerpiece {
  position: relative;
  width: 100%;
  max-width: 580px;
  display: flex;
  flex-direction: column;
}

.spatial-viewport-card {
  width: 100%;
  background: rgba(14, 16, 24, 0.96);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(220, 38, 38, 0.3);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 25px 60px -10px rgba(0, 0, 0, 0.28), 0 0 45px rgba(220, 38, 38, 0.22), 0 0 90px rgba(220, 38, 38, 0.12);
  transition: transform 0.25s cubic-bezier(0.2, 0, 0, 1), box-shadow 0.35s ease, border-color 0.35s ease;
  position: relative;
  z-index: 2;
  will-change: transform;
}

.spatial-viewport-card:hover {
  border-color: rgba(239, 68, 68, 0.65);
  box-shadow: 0 35px 80px -10px rgba(220, 38, 38, 0.35), 0 0 60px rgba(220, 38, 38, 0.3), 0 0 120px rgba(220, 38, 38, 0.16);
}

.viewport-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 11px 18px;
  background: rgba(18, 20, 30, 0.98);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.viewport-dots {
  display: flex;
  align-items: center;
  gap: 6px;
}

.vp-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
}
.vp-dot.red { background: #ef4444; box-shadow: 0 0 6px rgba(239, 68, 68, 0.6); }
.vp-dot.yellow { background: #f59e0b; }
.vp-dot.green { background: #10b981; }

.viewport-label {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: #94a3b8;
  text-transform: uppercase;
  white-space: nowrap;
}

.viewport-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.vp-control-btn {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 6px;
  padding: 3px 9px;
  color: #cbd5e1;
  font-size: 10px;
  font-family: var(--font-mono);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.vp-control-btn:hover {
  background: #ef4444;
  color: #ffffff;
  border-color: #ef4444;
  box-shadow: 0 0 10px rgba(239, 68, 68, 0.5);
}

.viewport-status {
  font-family: var(--font-mono);
  font-size: 10px;
  color: #ef4444;
  font-weight: 700;
  letter-spacing: 0.08em;
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: 2px;
}

.viewport-status-pulse {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #ef4444;
  box-shadow: 0 0 8px #ef4444;
  animation: pulse-dot 1.6s infinite ease-in-out;
}

.viewport-screen {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #050608;
  overflow: hidden;
  border-radius: 0 0 19px 19px;
}

.viewport-screen::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.06) 0%, transparent 40%, rgba(220, 38, 38, 0.05) 100%);
  z-index: 2;
}

/* Corner Cyber Framing Brackets */
.cyber-bracket {
  position: absolute;
  width: 14px;
  height: 14px;
  z-index: 4;
  pointer-events: none;
  border-color: rgba(239, 68, 68, 0.7);
  border-style: solid;
}
.cyber-bracket.top-left { top: 12px; left: 12px; border-width: 2px 0 0 2px; }
.cyber-bracket.top-right { top: 12px; right: 12px; border-width: 2px 2px 0 0; }
.cyber-bracket.bottom-left { bottom: 12px; left: 12px; border-width: 0 0 2px 2px; }
.cyber-bracket.bottom-right { bottom: 12px; right: 12px; border-width: 0 2px 2px 0; }

/* Overlay HUD Telemetry Indicators */
.screen-hud-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 3;
  padding: 14px 18px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.hud-reticle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.hud-reticle {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.1em;
  color: rgba(255, 255, 255, 0.8);
  text-shadow: 0 0 8px rgba(0, 0, 0, 0.9);
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(0, 0, 0, 0.4);
  padding: 3px 8px;
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(4px);
}

.reticle-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #ef4444;
  box-shadow: 0 0 6px #ef4444;
  animation: pulse-dot 1.5s infinite;
}

.reticle-badge {
  background: rgba(239, 68, 68, 0.22);
  border: 1px solid rgba(239, 68, 68, 0.45);
  color: #fca5a5;
  padding: 3px 7px;
  border-radius: 4px;
  font-size: 9px;
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-shadow: 0 0 8px rgba(239, 68, 68, 0.5);
}

.hero-media-display {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* Neural Canvas Overlay */
.hero-canvas {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 640px;
  height: 640px;
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 1;
}

/* Floating HUD Tag */
.floating-hud-badge {
  position: absolute;
  bottom: -18px;
  right: -14px;
  z-index: 4;
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-subtle);
  padding: 12px 18px;
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  display: flex;
  align-items: center;
  gap: 12px;
  animation: float-reverse 7s ease-in-out infinite alternate;
}

.hud-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: rgba(239, 68, 68, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--red-bright);
}

.hud-text-main {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  color: var(--text-white);
}

.hud-text-sub {
  font-size: 10px;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

@keyframes float-slow {
  0% { transform: translateY(0px) rotate(0deg); }
  100% { transform: translateY(-16px) rotate(2deg); }
}

@keyframes float-reverse {
  0% { transform: translateY(0px); }
  100% { transform: translateY(12px); }
}

/* ==========================================================================
   SECTION COMMON HEADERS
   ========================================================================== */
.section {
  padding: 100px 0;
  position: relative;
  z-index: 2;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 60px;
}

.section-header .section-eyebrow {
  justify-content: center;
}

.section-header .section-eyebrow::before {
  display: none;
}

.section-title {
  font-size: clamp(30px, 3.8vw, 44px);
  margin-bottom: 16px;
  line-height: 1.15;
}

.section-sub {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   CAPABILITIES BENTO GRID
   ========================================================================== */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
}

.bento-card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-subtle);
  border-radius: 24px;
  padding: 32px;
  position: relative;
  overflow: hidden;
  transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: var(--box-shadow-card);
}

.bento-card:hover {
  transform: translateY(-5px);
  background: var(--bg-card-hover);
  border-color: var(--red-bright);
  box-shadow: 0 20px 40px -15px rgba(220, 38, 38, 0.15), 0 10px 20px rgba(0, 0, 0, 0.05);
}

.bento-card.col-6 { grid-column: span 6; }
.bento-card.col-4 { grid-column: span 4; }
.bento-card.col-8 { grid-column: span 8; }
.bento-card.col-12 { grid-column: span 12; }

.card-icon-box {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: var(--black-primary);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  margin-bottom: 24px;
  transition: all 0.3s ease;
}

.card-icon-box.red-tint {
  color: #ffffff;
  background: var(--red-bright);
  border-color: var(--red-bright);
}

.bento-card:hover .card-icon-box {
  transform: scale(1.08);
  box-shadow: 0 4px 15px rgba(220, 38, 38, 0.3);
}

.bento-title {
  font-size: 20px;
  margin-bottom: 12px;
}

.bento-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
}

.tech-tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tech-pill {
  font-size: 11px;
  font-family: var(--font-mono);
  background: var(--gray-light);
  border: 1px solid var(--border-subtle);
  padding: 4px 10px;
  border-radius: 9999px;
  color: var(--text-secondary);
  transition: all 0.2s ease;
}

.tech-pill:hover {
  background: var(--black-primary);
  color: #ffffff;
  border-color: var(--black-primary);
}

/* ==========================================================================
   METHODOLOGY / PROCESS (I, II, III)
   ========================================================================== */
.methodology-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  position: relative;
}

.process-step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  padding: 32px;
  position: relative;
  transition: all 0.3s ease;
  box-shadow: var(--box-shadow-card);
}

.process-step-card:hover {
  border-color: var(--red-bright);
  transform: translateY(-4px);
  box-shadow: 0 15px 30px rgba(220, 38, 38, 0.12), 0 5px 15px rgba(0,0,0,0.04);
}

.step-num-pill {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--black-primary);
  border: 1px solid var(--black-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 20px;
}

.step-badge {
  display: inline-block;
  font-size: 10px;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 3px 8px;
  border-radius: 6px;
  background: rgba(239, 68, 68, 0.1);
  color: var(--red-bright);
  border: 1px solid rgba(239, 68, 68, 0.25);
  margin-bottom: 12px;
}

.step-title {
  font-size: 19px;
  margin-bottom: 10px;
}

.step-desc {
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   PROJECTS SHOWCASE SECTION
   ========================================================================== */
.project-filters {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 48px;
}

.filter-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 8px 18px;
  border-radius: 9999px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 2px 6px rgba(0,0,0,0.03);
}

.filter-btn:hover {
  color: var(--text-white);
  border-color: var(--border-glass);
}

.filter-btn.active {
  background: var(--black-primary);
  border-color: var(--black-primary);
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 28px;
}

.project-card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-subtle);
  border-radius: 24px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  box-shadow: var(--box-shadow-card);
}

.project-card.featured {
  grid-column: span 12;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
}

.project-card.standard {
  grid-column: span 6;
}

.project-card:hover {
  transform: translateY(-6px);
  border-color: var(--red-bright);
  box-shadow: 0 25px 50px -12px rgba(220, 38, 38, 0.15), 0 10px 25px rgba(0, 0, 0, 0.05);
}

.project-media-wrap {
  position: relative;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16/9;
  background: #0d0f17;
}

.project-card.featured .project-media-wrap {
  aspect-ratio: auto;
  height: 100%;
  min-height: 380px;
}

.project-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.project-card:hover .project-img {
  transform: scale(1.04);
}

.project-overlay-gradient {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(9, 9, 11, 0.8) 100%);
}

.project-impact-badge {
  position: absolute;
  top: 18px;
  left: 18px;
  background: rgba(9, 9, 11, 0.85);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(239, 68, 68, 0.5);
  padding: 6px 12px;
  border-radius: 9999px;
  font-size: 11px;
  font-family: var(--font-mono);
  font-weight: 600;
  color: #f87171;
  z-index: 2;
  box-shadow: 0 4px 15px rgba(0,0,0,0.4);
}

.project-impact-badge.blue-glow {
  border-color: rgba(220, 38, 38, 0.5);
  color: #ffffff;
}

.project-body {
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  flex: 1;
}

.project-category {
  font-size: 11px;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--red-bright);
  margin-bottom: 8px;
  font-weight: 600;
}

.project-title {
  font-size: 22px;
  margin-bottom: 12px;
  line-height: 1.25;
}

.project-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 24px;
}

.project-metrics-row {
  display: flex;
  gap: 20px;
  padding: 14px 0;
  margin-bottom: 20px;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.metric-pill {
  display: flex;
  flex-direction: column;
}

.metric-val {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--text-white);
}

.metric-lbl {
  font-size: 9px;
  font-family: var(--font-mono);
  color: var(--text-muted);
  text-transform: uppercase;
}

.project-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: auto;
}

.project-links {
  display: flex;
  align-items: center;
  gap: 12px;
}

.link-btn-icon {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  text-decoration: none;
  transition: all 0.2s ease;
  box-shadow: 0 2px 6px rgba(0,0,0,0.04);
}

.link-btn-icon:hover {
  background: var(--black-primary);
  color: #fff;
  transform: translateY(-2px);
  border-color: var(--black-primary);
}

/* ==========================================================================
   INTERACTIVE CYBERNETIC AI TERMINAL
   ========================================================================== */
.terminal-card {
  background: #09090b;
  border: 1px solid #27272a;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.2), 0 0 25px rgba(220, 38, 38, 0.15);
  max-width: 960px;
  margin: 0 auto;
}

.terminal-header {
  background: #18181b;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #27272a;
}

.terminal-controls {
  display: flex;
  gap: 8px;
}

.t-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}
.t-dot.red { background: #ef4444; }
.t-dot.yellow { background: #f59e0b; }
.t-dot.green { background: #10b981; }

.terminal-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: #a1a1aa;
  text-transform: uppercase;
}

.terminal-body {
  padding: 24px;
  font-family: var(--font-mono);
  font-size: 13px;
  min-height: 280px;
  max-height: 380px;
  overflow-y: auto;
  color: #e4e4e7;
  line-height: 1.7;
}

.t-output-line {
  margin-bottom: 10px;
}

.t-prompt-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 14px;
}

.t-prompt-symbol {
  color: #ef4444;
  font-weight: 700;
}

.t-input {
  flex: 1;
  background: transparent;
  border: none;
  font-family: var(--font-mono);
  font-size: 13px;
  color: #ffffff;
  outline: none;
}

.terminal-quick-chips {
  padding: 14px 24px;
  background: #121215;
  border-top: 1px solid #27272a;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.chip-label {
  font-size: 11px;
  font-family: var(--font-mono);
  color: #71717a;
}

.t-chip {
  background: #27272a;
  border: 1px solid #3f3f46;
  color: #d4d4d8;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 11px;
  font-family: var(--font-mono);
  cursor: pointer;
  transition: all 0.2s ease;
}

.t-chip:hover {
  background: #dc2626;
  color: #ffffff;
  border-color: #dc2626;
}

/* ==========================================================================
   RESEARCH & ACADEMIC INNOVATIONS
   ========================================================================== */
.research-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.research-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  padding: 32px;
  transition: all 0.3s ease;
  position: relative;
  box-shadow: var(--box-shadow-card);
}

.research-card:hover {
  border-color: var(--red-bright);
  transform: translateY(-4px);
  box-shadow: 0 15px 35px rgba(220, 38, 38, 0.12), 0 5px 15px rgba(0,0,0,0.05);
}

.research-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--red-bright);
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.2);
  padding: 4px 10px;
  border-radius: 6px;
  display: inline-block;
  margin-bottom: 14px;
}

.research-title {
  font-size: 20px;
  margin-bottom: 12px;
}

.research-role {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-secondary);
  font-weight: 600;
  margin-bottom: 16px;
}

.research-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ==========================================================================
   TECHNICAL SKILLS ARSENAL
   ========================================================================== */
.skills-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.skill-domain-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  padding: 28px;
  transition: all 0.3s ease;
  box-shadow: var(--box-shadow-card);
}

.skill-domain-card:hover {
  border-color: var(--red-bright);
}

.skill-domain-title {
  font-size: 17px;
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.domain-icon {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: var(--red-bright);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.skill-badges-wrapper {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.skill-tag-item {
  background: var(--gray-light);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 7px 14px;
  border-radius: 9999px;
  font-size: 12px;
  font-weight: 600;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.skill-tag-item:hover {
  background: var(--red-bright);
  border-color: var(--red-bright);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(220, 38, 38, 0.25);
}

/* Explicit Dark Mode Overrides for Skills & Badges */
[data-theme="dark"] .skill-domain-card {
  background: rgba(13, 16, 26, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

[data-theme="dark"] .skill-domain-card:hover {
  border-color: var(--red-bright);
}

[data-theme="dark"] .skill-tag-item {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.14);
  color: #f1f5f9;
}

[data-theme="dark"] .skill-tag-item:hover {
  background: var(--red-bright);
  border-color: var(--red-bright);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(239, 68, 68, 0.4);
}

[data-theme="dark"] .domain-icon {
  background: var(--red-bright) !important;
  color: #ffffff;
}

[data-theme="dark"] .tech-pill {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #cbd5e1;
}

[data-theme="dark"] .tech-pill:hover {
  background: var(--red-bright);
  border-color: var(--red-bright);
  color: #ffffff;
}

[data-theme="dark"] .filter-btn {
  background: rgba(13, 16, 26, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #94a3b8;
}

[data-theme="dark"] .filter-btn:hover {
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.25);
}

[data-theme="dark"] .filter-btn.active {
  background: var(--red-bright);
  border-color: var(--red-bright);
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(239, 68, 68, 0.35);
}

[data-theme="dark"] .modal-close-btn {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #ffffff;
}

[data-theme="dark"] .step-num-pill {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #ffffff;
}

/* ==========================================================================
   EDUCATION & LEADERSHIP
   ========================================================================== */
.edu-lead-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.history-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  padding: 32px;
  box-shadow: var(--box-shadow-card);
}

.history-item {
  position: relative;
  padding-left: 28px;
  padding-bottom: 28px;
  border-left: 1px solid var(--border-subtle);
}

.history-item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.history-dot {
  position: absolute;
  left: -5px;
  top: 4px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--black-primary);
  box-shadow: 0 0 8px rgba(0,0,0,0.2);
}

.history-dot.red {
  background: var(--red-bright);
  box-shadow: 0 0 8px var(--red-bright);
}

.history-date {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 4px;
}

.history-heading {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 4px;
}

.history-sub {
  font-size: 13px;
  color: var(--red-bright);
  font-weight: 600;
  margin-bottom: 8px;
}

.history-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* ==========================================================================
   CONTACT TRANSMISSION & FOOTER
   ========================================================================== */
.contact-card-grand {
  background: var(--black-primary);
  color: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: 32px;
  padding: 60px 48px;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.15), 0 0 45px rgba(220, 38, 38, 0.12);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  position: relative;
  overflow: hidden;
}

.contact-card-grand::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #dc2626, #ef4444);
}

.contact-left h2 {
  font-size: 38px;
  line-height: 1.15;
  margin-bottom: 16px;
  color: #ffffff;
}

.contact-left p {
  font-size: 15px;
  color: #a1a1aa;
  line-height: 1.6;
  margin-bottom: 32px;
}

.contact-direct-items {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-row-item {
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  color: #ffffff;
  transition: all 0.2s ease;
}

.contact-row-item:hover {
  color: var(--red-bright);
  transform: translateX(4px);
}

.contact-icon-circle {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
}

.contact-row-item:hover .contact-icon-circle {
  background: var(--red-bright);
  border-color: var(--red-bright);
}

.contact-right {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 12px;
  font-family: var(--font-mono);
  color: #a1a1aa;
  text-transform: uppercase;
}

.form-input, .form-textarea {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 12px;
  padding: 12px 16px;
  font-family: var(--font-body);
  font-size: 14px;
  color: #ffffff;
  outline: none;
  transition: all 0.2s ease;
}

.form-input:focus, .form-textarea:focus {
  border-color: var(--red-bright);
  box-shadow: 0 0 15px rgba(220, 38, 38, 0.35);
}

.form-textarea {
  min-height: 110px;
  resize: vertical;
}

.site-footer {
  padding: 40px 0;
  border-top: 1px solid var(--border-subtle);
  margin-top: 80px;
  position: relative;
  z-index: 2;
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-copy {
  font-size: 13px;
  color: var(--text-muted);
}

.footer-socials {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* ==========================================================================
   MODAL DIALOG & TOAST NOTIFICATION
   ========================================================================== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(9, 9, 11, 0.7);
  backdrop-filter: blur(12px);
  z-index: 200;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.modal-backdrop.open {
  display: flex;
  opacity: 1;
}

.modal-window {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 24px;
  max-width: 680px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  position: relative;
  padding: 36px;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.25);
  transform: scale(0.95);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-backdrop.open .modal-window {
  transform: scale(1);
}

.modal-close-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--gray-light);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.modal-close-btn:hover {
  color: #fff;
  background: var(--red-bright);
  border-color: var(--red-bright);
}

/* Toast Message */
.toast-notice {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--black-primary);
  border: 1px solid var(--red-bright);
  color: #ffffff;
  padding: 12px 20px;
  border-radius: 12px;
  font-size: 13px;
  font-family: var(--font-mono);
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
  z-index: 300;
  display: flex;
  align-items: center;
  gap: 10px;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.toast-notice.show {
  transform: translateY(0);
  opacity: 1;
}

/* ==========================================================================
   RESPONSIVE MEDIA QUERIES
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-visual-wrapper {
    order: -1;
    max-width: 320px;
    margin: 0 auto;
  }

  .bento-card.col-6, .bento-card.col-4, .bento-card.col-8 {
    grid-column: span 12;
  }

  .project-card.featured {
    grid-template-columns: 1fr;
  }

  .project-card.standard {
    grid-column: span 12;
  }

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

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

  .edu-lead-grid {
    grid-template-columns: 1fr;
  }

  .contact-card-grand {
    grid-template-columns: 1fr;
    padding: 36px 24px;
  }
}

@media (max-width: 768px) {
  .floating-nav {
    display: none;
  }

  .telemetry-bar {
    grid-template-columns: repeat(2, 1fr);
  }

  .methodology-row {
    grid-template-columns: 1fr;
  }

  .hero-title {
    font-size: 34px;
  }

  .hero-description {
    font-size: 15px;
  }
}