/* ============================================================
   NIKHIL TOGADIYA — AI NEURAL NETWORK PORTFOLIO STYLESHEET
   Theme: Light (default) ↔ Dark (toggle) — AI Neural Network
   Light Palette: Indigo / Violet / Teal / Rose
   Dark  Palette: Cyan / Purple / Green / Pink
   ============================================================ */

/* ---------- CSS Variables — LIGHT MODE (default) ---------- */
:root {
  /* RGB channel variables (enable alpha-flexible theming) */
  --accent1-rgb:      79, 70, 229;     /* Indigo */
  --accent2-rgb:      124, 58, 237;    /* Violet */
  --accent3-rgb:      13, 148, 136;    /* Teal */
  --accent4-rgb:      225, 29, 72;     /* Rose */
  --bg-primary-rgb:   255, 255, 255;
  --bg-card-rgb:      255, 255, 255;

  /* Backgrounds */
  --bg-primary:       #ffffff;
  --bg-secondary:     #f8fafc;
  --bg-tertiary:      #f1f5f9;
  --bg-card:          rgba(var(--bg-card-rgb), 0.85);
  --bg-card-solid:    #ffffff;
  --bg-section-alt:   #f8fafc;

  /* Accent Colors */
  --glow-cyan:        #4f46e5;   /* Indigo */
  --glow-purple:      #7c3aed;   /* Violet */
  --glow-green:       #0d9488;   /* Teal */
  --glow-pink:        #e11d48;   /* Rose */
  --glow-amber:       #d97706;   /* Amber */

  /* Primary / Accent mapped */
  --primary:          #4f46e5;
  --primary-dark:     #4338ca;
  --primary-light:    rgba(var(--accent1-rgb), 0.12);
  --primary-subtle:   rgba(var(--accent1-rgb), 0.06);
  --accent:           #7c3aed;
  --accent-dark:      #6d28d9;
  --accent-light:     rgba(var(--accent2-rgb), 0.12);

  /* Text */
  --text-primary:     #0f172a;
  --text-secondary:   #475569;
  --text-muted:       #94a3b8;
  --text-on-primary:  #ffffff;

  /* Borders & Shadows */
  --border:           rgba(var(--accent2-rgb), 0.12);
  --border-glow:      rgba(var(--accent1-rgb), 0.3);
  --shadow-sm:        0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md:        0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-lg:        0 10px 40px rgba(0, 0, 0, 0.12);
  --shadow-glow:      0 0 20px rgba(var(--accent1-rgb), 0.12);
  --shadow-glow-purple: 0 0 20px rgba(var(--accent2-rgb), 0.12);

  /* Hero name gradient start */
  --hero-name-start:  #0f172a;

  /* Navbar */
  --navbar-bg:        rgba(255, 255, 255, 0.85);
  --navbar-scrolled:  rgba(255, 255, 255, 0.95);
  --navbar-shadow:    rgba(0, 0, 0, 0.06);
  --navbar-border:    rgba(var(--accent2-rgb), 0.1);

  /* Scrollbar */
  --scrollbar-track:  #f1f5f9;
  --scrollbar-thumb:  rgba(var(--accent1-rgb), 0.3);
  --scrollbar-hover:  rgba(var(--accent1-rgb), 0.5);

  /* Layout */
  --max-width:        1200px;
  --radius:           12px;
  --radius-lg:        20px;
  --transition:       0.3s cubic-bezier(0.4, 0, 0.2, 1);

  /* Typography */
  --font-sans:        'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono:        'Fira Code', 'JetBrains Mono', monospace;
}

/* ---------- CSS Variables — DARK MODE ---------- */
[data-theme="dark"] {
  --accent1-rgb:      0, 245, 255;     /* Cyan */
  --accent2-rgb:      139, 92, 246;    /* Purple */
  --accent3-rgb:      16, 185, 129;    /* Green */
  --accent4-rgb:      236, 72, 153;    /* Pink */
  --bg-primary-rgb:   10, 10, 26;
  --bg-card-rgb:      15, 15, 46;

  --bg-primary:       #0a0a1a;
  --bg-secondary:     #0f0f2e;
  --bg-tertiary:      #111133;
  --bg-card:          rgba(var(--bg-card-rgb), 0.65);
  --bg-card-solid:    #12123a;
  --bg-section-alt:   #0d0d28;

  --glow-cyan:        #00f5ff;
  --glow-purple:      #8b5cf6;
  --glow-green:       #10b981;
  --glow-pink:        #ec4899;
  --glow-amber:       #f59e0b;

  --primary:          #00f5ff;
  --primary-dark:     #00c4cc;
  --accent:           #8b5cf6;
  --accent-dark:      #7c3aed;

  --text-primary:     #e2e8f0;
  --text-secondary:   #94a3b8;
  --text-muted:       #64748b;
  --text-on-primary:  #0a0a1a;

  --border:           rgba(var(--accent2-rgb), 0.15);
  --border-glow:      rgba(var(--accent1-rgb), 0.25);
  --shadow-sm:        0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md:        0 4px 20px rgba(0, 0, 0, 0.5);
  --shadow-lg:        0 10px 40px rgba(0, 0, 0, 0.6);
  --shadow-glow:      0 0 30px rgba(var(--accent1-rgb), 0.15);
  --shadow-glow-purple: 0 0 30px rgba(var(--accent2-rgb), 0.15);

  --hero-name-start:  #ffffff;

  --navbar-bg:        rgba(10, 10, 26, 0.8);
  --navbar-scrolled:  rgba(10, 10, 26, 0.95);
  --navbar-shadow:    rgba(0, 0, 0, 0.5);
  --navbar-border:    rgba(var(--accent2-rgb), 0.1);

  --scrollbar-track:  #0a0a1a;
  --scrollbar-thumb:  rgba(var(--accent1-rgb), 0.3);
  --scrollbar-hover:  rgba(var(--accent1-rgb), 0.5);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background 0.4s ease, color 0.4s ease;
}

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

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--glow-cyan); }

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

/* ---------- Utility Classes ---------- */
.container {
  width: 90%;
  max-width: var(--max-width);
  margin: 0 auto;
}

.section {
  padding: 100px 0;
  position: relative;
  overflow: hidden;
}

.section-alt {
  background: var(--bg-section-alt);
}

.section-title {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--text-primary);
  text-align: center;
  margin-bottom: 0.5rem;
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 3rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.highlight {
  background: linear-gradient(135deg, var(--glow-cyan), var(--glow-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---------- Cursor Glow ---------- */
.cursor-glow {
  position: fixed;
  top: 0;
  left: 0;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(var(--accent1-rgb),0.06) 0%, transparent 70%);
  pointer-events: none;
  z-index: 9999;
  border-radius: 50%;
  transition: none;
  will-change: transform;
}

/* ---------- Card Shine ---------- */
.card-shine {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border-radius: inherit;
  pointer-events: none;
  z-index: 1;
  transition: background 0.3s ease;
}

/* ---------- Scroll Animations ---------- */
.fade-in {
  opacity: 0;
  transform: translateY(30px) translateZ(0);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0) translateZ(0);
}
.fade-in-left {
  opacity: 0;
  transform: translateX(-40px) translateZ(0);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.fade-in-left.visible {
  opacity: 1;
  transform: translateX(0) translateZ(0);
}
.fade-in-right {
  opacity: 0;
  transform: translateX(40px) translateZ(0);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.fade-in-right.visible {
  opacity: 1;
  transform: translateX(0) translateZ(0);
}

/* ---------- Glassmorphism Card Base ---------- */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
}

.glass-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--glow-cyan), var(--glow-purple), transparent);
  opacity: 0.5;
}

/* ================================================================
   NAVBAR
   ================================================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--navbar-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--navbar-border);
  transition: box-shadow var(--transition), background var(--transition);
}
.navbar.scrolled {
  box-shadow: 0 4px 30px var(--navbar-shadow);
  background: var(--navbar-scrolled);
  border-bottom-color: rgba(var(--accent1-rgb), 0.15);
}
.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--glow-cyan), var(--glow-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.nav-logo span {
  background: linear-gradient(135deg, var(--glow-purple), var(--glow-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
  align-items: center;
}
.nav-links a {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  padding: 4px 0;
  transition: color var(--transition);
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--glow-cyan), var(--glow-purple));
  border-radius: 1px;
  transition: width var(--transition);
  box-shadow: 0 0 8px var(--glow-cyan);
}
.nav-links a:hover { color: var(--glow-cyan); }
.nav-links a:hover::after,
.nav-links a.active::after { width: 100%; }
.nav-links a.active { color: var(--glow-cyan); }

.nav-resume-btn {
  background: linear-gradient(135deg, var(--glow-cyan), var(--glow-purple));
  color: var(--text-on-primary) !important;
  -webkit-text-fill-color: var(--text-on-primary) !important;
  padding: 8px 20px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  transition: all var(--transition);
}
.nav-resume-btn:hover {
  box-shadow: 0 0 20px rgba(var(--accent1-rgb), 0.4);
  transform: translateY(-1px);
}
.nav-resume-btn::after { display: none !important; }

/* Mobile Menu Toggle */
.nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
}
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 5px;
}
.nav-toggle span {
  width: 24px;
  height: 2.5px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ================================================================
   HERO SECTION
   ================================================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 70px;
  background: var(--bg-primary);
  position: relative;
  overflow: hidden;
}

/* Three.js Canvas Background */
#neural-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

/* Gradient overlay on canvas for depth */
.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(var(--accent2-rgb), 0.12) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(var(--accent1-rgb), 0.1) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(var(--accent3-rgb), 0.06) 0%, transparent 40%),
    linear-gradient(180deg, transparent 75%, var(--bg-primary) 100%);
  z-index: 1;
  pointer-events: none;
}

/* Scanline overlay for added depth */
.hero::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(var(--accent1-rgb), 0.008) 2px,
    rgba(var(--accent1-rgb), 0.008) 4px
  );
  z-index: 1;
  pointer-events: none;
}

.hero .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 4rem;
  position: relative;
  z-index: 2;
}

.hero-content {
  flex: 1;
  max-width: 650px;
}

.hero-greeting {
  font-size: 1.1rem;
  color: var(--glow-cyan);
  font-weight: 600;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  text-shadow: 0 0 20px rgba(var(--accent1-rgb), 0.3);
}
.hero-greeting .wave {
  display: inline-block;
  animation: wave 2s ease-in-out infinite;
  transform-origin: 70% 70%;
}
@keyframes wave {
  0%   { transform: rotate(0); }
  10%  { transform: rotate(14deg); }
  20%  { transform: rotate(-8deg); }
  30%  { transform: rotate(14deg); }
  40%  { transform: rotate(-4deg); }
  50%  { transform: rotate(10deg); }
  60%  { transform: rotate(0); }
  100% { transform: rotate(0); }
}

.hero-name {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 0.5rem;
  letter-spacing: -1px;
  background: linear-gradient(135deg, var(--hero-name-start) 0%, var(--glow-cyan) 50%, var(--glow-purple) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: none;
}

/* Typing Effect */
.hero-typing {
  font-size: 1.3rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  min-height: 2rem;
  font-family: var(--font-mono);
}
.hero-typing .cursor {
  display: inline-block;
  width: 3px;
  height: 1.3rem;
  background: var(--glow-cyan);
  margin-left: 2px;
  animation: blink 1s step-end infinite;
  vertical-align: text-bottom;
  box-shadow: 0 0 8px var(--glow-cyan);
}
@keyframes blink {
  50% { opacity: 0; }
}

.hero-description {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 2rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  text-decoration: none;
  position: relative;
}
.btn-primary {
  background: linear-gradient(135deg, var(--glow-cyan), var(--glow-purple));
  color: var(--text-on-primary);
  box-shadow: 0 4px 20px rgba(var(--accent1-rgb), 0.25);
}
.btn-primary:hover {
  color: var(--text-on-primary);
  transform: translateY(-2px);
  box-shadow: 0 6px 30px rgba(var(--accent1-rgb), 0.4);
}
.btn-outline {
  background: transparent;
  color: var(--glow-cyan);
  border: 2px solid var(--glow-cyan);
  box-shadow: 0 0 15px rgba(var(--accent1-rgb), 0.1);
}
.btn-outline:hover {
  background: rgba(var(--accent1-rgb), 0.1);
  color: var(--glow-cyan);
  transform: translateY(-2px);
  box-shadow: 0 0 25px rgba(var(--accent1-rgb), 0.25);
}

/* Hero Avatar */
.hero-image {
  flex-shrink: 0;
  position: relative;
}
.hero-avatar-wrapper {
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--glow-cyan), var(--glow-purple), var(--glow-green));
  padding: 4px;
  box-shadow:
    0 0 40px rgba(var(--accent1-rgb), 0.2),
    0 0 80px rgba(var(--accent2-rgb), 0.1);
  animation: avatar-float 6s ease-in-out infinite;
  position: relative;
}
.hero-avatar-wrapper::before {
  content: '';
  position: absolute;
  inset: -8px;
  border-radius: 50%;
  border: 1px solid rgba(var(--accent1-rgb), 0.15);
  animation: avatar-ring-pulse 3s ease-in-out infinite;
}
.hero-avatar-wrapper::after {
  content: '';
  position: absolute;
  inset: -20px;
  border-radius: 50%;
  border: 1px solid rgba(var(--accent2-rgb), 0.1);
  animation: avatar-ring-pulse 3s ease-in-out infinite 1.5s;
}

@keyframes avatar-float {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-15px); }
}
@keyframes avatar-ring-pulse {
  0%, 100% { opacity: 0.3; transform: scale(1); }
  50%      { opacity: 0.8; transform: scale(1.05); }
}

.hero-avatar-wrapper img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  background: var(--bg-primary);
}

/* Hero Stats */
.hero-stats {
  display: flex;
  gap: 2.5rem;
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}
.hero-stat h3 {
  font-size: 1.8rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--glow-cyan), var(--glow-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-stat p {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ================================================================
   ABOUT SECTION
   ================================================================ */
#about {
  background:
    radial-gradient(ellipse at 50% 0%, rgba(var(--accent2-rgb), 0.05) 0%, transparent 50%),
    var(--bg-section-alt);
}

/* Circuit-board pattern */
#about::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    radial-gradient(circle at 20% 80%, rgba(var(--accent1-rgb), 0.04) 2px, transparent 2px),
    radial-gradient(circle at 80% 20%, rgba(var(--accent2-rgb), 0.04) 2px, transparent 2px),
    radial-gradient(circle at 50% 50%, rgba(var(--accent3-rgb), 0.03) 1.5px, transparent 1.5px);
  background-size: 60px 60px, 80px 80px, 100px 100px;
  pointer-events: none;
}

/* Floating 3D diamond shape */
#about::after {
  content: '';
  position: absolute;
  top: 100px;
  left: 40px;
  width: 60px;
  height: 60px;
  border: 1.5px solid rgba(var(--accent2-rgb), 0.3);
  animation: rotate-diamond 8s linear infinite, float-shape 5s ease-in-out infinite;
  pointer-events: none;
  z-index: 0;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  font-size: 1.05rem;
}
.about-text strong {
  color: var(--glow-cyan);
  font-weight: 600;
}

.about-highlights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 2rem;
}

.about-highlight-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 1.5rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  text-align: center;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.about-highlight-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--glow-cyan), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}
.about-highlight-card:hover::before {
  opacity: 1;
}
.about-highlight-card:hover {
  border-color: var(--border-glow);
  box-shadow:
    0 0 30px rgba(var(--accent1-rgb), 0.2),
    0 20px 40px rgba(0, 0, 0, 0.3),
    inset 0 0 30px rgba(var(--accent1-rgb), 0.03);
  transform: translateY(-8px) scale(1.02);
}
.about-highlight-card .icon {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}
.about-highlight-card h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}
.about-highlight-card p {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* Tilt card styles (for JS-driven 3D tilt) */
.tilt-card {
  transition: transform 0.15s ease-out, box-shadow 0.3s ease;
  will-change: transform;
  transform-style: preserve-3d;
}
.tilt-card:hover {
  box-shadow:
    0 25px 50px rgba(0, 0, 0, 0.4),
    0 0 40px rgba(var(--accent1-rgb), 0.1);
}

/* ================================================================
   EXPERIENCE SECTION (Timeline) + Grid Floor
   ================================================================ */
#experience {
  background: var(--bg-primary);
  position: relative;
}

/* Perspective Grid Floor — DRAMATIC */
#experience::before {
  content: '';
  position: absolute;
  bottom: -20px;
  left: -100%;
  width: 400%;
  height: 500px;
  background:
    repeating-linear-gradient(
      90deg,
      rgba(var(--accent1-rgb), 0.1) 0px,
      rgba(var(--accent1-rgb), 0.1) 1px,
      transparent 1px,
      transparent 50px
    ),
    repeating-linear-gradient(
      0deg,
      rgba(var(--accent2-rgb), 0.08) 0px,
      rgba(var(--accent2-rgb), 0.08) 1px,
      transparent 1px,
      transparent 50px
    );
  transform: perspective(400px) rotateX(55deg);
  transform-origin: center bottom;
  pointer-events: none;
  mask-image: linear-gradient(to top, rgba(0,0,0,0.6) 0%, transparent 80%);
  -webkit-mask-image: linear-gradient(to top, rgba(0,0,0,0.6) 0%, transparent 80%);
  animation: grid-scroll 20s linear infinite;
}
@keyframes grid-scroll {
  0%   { background-position: 0 0, 0 0; }
  100% { background-position: 50px 0, 0 50px; }
}

/* Floating 3D wireframe cube decoration */
#experience::after {
  content: '';
  position: absolute;
  top: 80px;
  right: 60px;
  width: 80px;
  height: 80px;
  border: 1.5px solid rgba(var(--accent1-rgb), 0.25);
  animation: rotate-cube 10s linear infinite, float-shape 6s ease-in-out infinite;
  pointer-events: none;
  z-index: 0;
}

.timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 30px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(to bottom, var(--glow-cyan), var(--glow-purple), var(--glow-green));
  border-radius: 2px;
  box-shadow: 0 0 15px rgba(var(--accent1-rgb), 0.3);
}

.timeline-item {
  position: relative;
  padding-left: 70px;
  margin-bottom: 3rem;
}
.timeline-item:last-child { margin-bottom: 0; }

.timeline-dot {
  position: absolute;
  left: 20px;
  top: 6px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 3px solid var(--glow-cyan);
  z-index: 1;
  transition: all var(--transition);
  box-shadow: 0 0 10px rgba(var(--accent1-rgb), 0.3);
}

/* Pulse ring animation on dots */
.timeline-dot::after {
  content: '';
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  border: 1px solid var(--glow-cyan);
  opacity: 0;
  animation: pulse-ring 2s ease-out infinite;
}
@keyframes pulse-ring {
  0%   { opacity: 0.6; transform: scale(1); }
  100% { opacity: 0; transform: scale(1.8); }
}

.timeline-item:hover .timeline-dot {
  background: var(--glow-cyan);
  box-shadow: 0 0 20px rgba(var(--accent1-rgb), 0.6);
}

.timeline-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.timeline-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--glow-cyan), var(--glow-purple), transparent);
  opacity: 0.4;
}
.timeline-card:hover {
  box-shadow:
    0 0 30px rgba(var(--accent1-rgb), 0.15),
    0 20px 40px rgba(0, 0, 0, 0.3),
    inset 0 0 30px rgba(var(--accent1-rgb), 0.03);
  border-color: var(--border-glow);
  transform: translateY(-6px) scale(1.01);
}
.timeline-card:hover::before {
  opacity: 1;
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}
.timeline-role {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
}
.timeline-company {
  font-size: 1rem;
  color: var(--glow-cyan);
  font-weight: 600;
}
.timeline-date {
  font-size: 0.85rem;
  color: var(--glow-cyan);
  font-weight: 500;
  background: rgba(var(--accent1-rgb), 0.08);
  padding: 4px 12px;
  border-radius: 20px;
  white-space: nowrap;
  border: 1px solid rgba(var(--accent1-rgb), 0.15);
}
.timeline-location {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.timeline-points {
  list-style: none;
  padding: 0;
}
.timeline-points li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.7rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}
.timeline-points li::before {
  content: '▹';
  position: absolute;
  left: 0;
  color: var(--glow-cyan);
  font-weight: 700;
}

/* Tech tags */
.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}
.tag {
  background: rgba(var(--accent1-rgb), 0.08);
  color: var(--glow-cyan);
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  transition: all var(--transition);
  border: 1px solid rgba(var(--accent1-rgb), 0.12);
}
.tag:hover {
  background: rgba(var(--accent1-rgb), 0.2);
  border-color: var(--glow-cyan);
  box-shadow: 0 0 10px rgba(var(--accent1-rgb), 0.2);
}

/* Links for experience items */
.timeline-links {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}
.timeline-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--glow-cyan);
  padding: 6px 14px;
  border-radius: 8px;
  border: 1px solid rgba(var(--accent1-rgb), 0.2);
  transition: all var(--transition);
}
.timeline-link:hover {
  background: rgba(var(--accent1-rgb), 0.1);
  border-color: var(--glow-cyan);
  box-shadow: 0 0 15px rgba(var(--accent1-rgb), 0.2);
}

/* ================================================================
   PROJECTS SECTION + Matrix Rain
   ================================================================ */
#projects {
  background:
    radial-gradient(ellipse at 30% 70%, rgba(var(--accent1-rgb), 0.03) 0%, transparent 50%),
    var(--bg-section-alt);
  position: relative;
}

/* Matrix rain canvas container */
.matrix-rain-container {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.4;
}
#matrix-canvas {
  width: 100%;
  height: 100%;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 2rem;
  position: relative;
  z-index: 1;
}

.project-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.4s ease;
  display: flex;
  flex-direction: column;
  position: relative;
}
.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--glow-cyan), var(--glow-purple), var(--glow-green));
  opacity: 0.6;
}
.project-card:hover {
  box-shadow:
    0 0 40px rgba(var(--accent1-rgb), 0.2),
    0 30px 60px rgba(0, 0, 0, 0.4),
    inset 0 0 40px rgba(var(--accent1-rgb), 0.03);
  border-color: var(--border-glow);
  transform: translateY(-12px) rotateX(2deg);
}

.project-card-header {
  padding: 2rem 2rem 1rem;
}
.project-card-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}
.project-card-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.3rem;
}
.project-card-subtitle {
  font-size: 0.85rem;
  color: var(--glow-purple);
  font-weight: 600;
  margin-bottom: 0.3rem;
}
.project-card-date {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.project-card-body {
  padding: 0 2rem 1.5rem;
  flex: 1;
}
.project-card-body ul {
  list-style: none;
  padding: 0;
}
.project-card-body li {
  position: relative;
  padding-left: 1.3rem;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}
.project-card-body li::before {
  content: '▹';
  position: absolute;
  left: 0;
  color: var(--glow-green);
  font-weight: 700;
}

.project-card-footer {
  padding: 1rem 2rem 2rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  justify-content: space-between;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.project-links {
  display: flex;
  gap: 0.5rem;
}
.project-link {
  color: var(--text-muted);
  font-size: 1.2rem;
  transition: all var(--transition);
}
.project-link:hover {
  color: var(--glow-cyan);
  text-shadow: 0 0 10px rgba(var(--accent1-rgb), 0.4);
}

/* ================================================================
   SKILLS SECTION + Node Connections
   ================================================================ */
#skills {
  background: var(--bg-primary);
  position: relative;
}

.skills-bg-canvas {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  z-index: 0;
}
#skills-connections {
  width: 100%;
  height: 100%;
}

.skills-categories {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  position: relative;
  z-index: 1;
}

.skill-category {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.skill-category::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--glow-purple), transparent);
  opacity: 0.4;
}
.skill-category:hover {
  box-shadow: var(--shadow-glow-purple);
  border-color: rgba(var(--accent2-rgb), 0.3);
  transform: translateY(-3px);
}
.skill-category:hover::before {
  opacity: 1;
}

.skill-category-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--glow-purple);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.skill-tag {
  background: rgba(var(--accent2-rgb), 0.08);
  color: var(--text-secondary);
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all var(--transition);
  border: 1px solid transparent;
}
.skill-tag:hover {
  border-color: var(--glow-purple);
  color: var(--glow-purple);
  background: rgba(var(--accent2-rgb), 0.15);
  box-shadow: 0 0 10px rgba(var(--accent2-rgb), 0.2);
  text-shadow: 0 0 8px rgba(var(--accent2-rgb), 0.3);
  transform: translateY(-2px);
}

/* ================================================================
   EDUCATION SECTION — Holographic Cards
   ================================================================ */
#education {
  background:
    radial-gradient(ellipse at 70% 30%, rgba(var(--accent3-rgb), 0.04) 0%, transparent 50%),
    var(--bg-section-alt);
}

.education-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
  gap: 2rem;
  max-width: 900px;
  margin: 0 auto;
}

.education-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.education-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--glow-green), var(--glow-cyan), transparent);
  opacity: 0.4;
}
.education-card:hover {
  box-shadow:
    0 0 30px rgba(var(--accent3-rgb), 0.2),
    0 20px 40px rgba(0, 0, 0, 0.3),
    inset 0 0 30px rgba(var(--accent3-rgb), 0.03);
  border-color: rgba(var(--accent3-rgb), 0.4);
  transform: translateY(-8px) scale(1.02);
}
.education-card:hover::before {
  opacity: 1;
}

.education-icon {
  font-size: 2.5rem;
  flex-shrink: 0;
}
.education-info h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}
.education-info .school {
  color: var(--glow-green);
  font-weight: 600;
  font-size: 0.95rem;
}
.education-info .edu-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* ================================================================
   BLOG SECTION (kept for future)
   ================================================================ */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 2rem;
}
.blog-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
}
.blog-card:hover {
  box-shadow: var(--shadow-glow);
  border-color: var(--border-glow);
  transform: translateY(-5px);
}
.blog-card-image {
  width: 100%;
  height: 200px;
  background: linear-gradient(135deg, rgba(var(--accent1-rgb), 0.1), rgba(var(--accent2-rgb), 0.1));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
}
.blog-card-content { padding: 1.5rem 2rem 2rem; }
.blog-card-tag {
  display: inline-block;
  background: rgba(var(--accent1-rgb), 0.08);
  color: var(--glow-cyan);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 4px;
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.blog-card-title { font-size: 1.15rem; font-weight: 700; color: var(--text-primary); margin-bottom: 0.5rem; }
.blog-card-excerpt { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; margin-bottom: 1rem; }
.blog-card-meta { font-size: 0.8rem; color: var(--text-muted); }
.blog-coming-soon {
  text-align: center;
  padding: 3rem;
  background: var(--bg-card);
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
}
.blog-coming-soon p { color: var(--text-muted); font-size: 1.1rem; }

/* ================================================================
   CONTACT SECTION — Glowing Portal
   ================================================================ */
#contact {
  background:
    radial-gradient(circle at 50% 50%, rgba(var(--accent1-rgb), 0.03) 0%, transparent 50%),
    var(--bg-primary);
}

.contact-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  margin-top: 3rem;
}

.contact-info h3 {
  font-size: 1.8rem;
  color: var(--text-primary);
  margin-bottom: 1rem;
}
.contact-info > p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
  font-size: 1.05rem;
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.contact-method {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  padding: 1.5rem;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all var(--transition);
  color: var(--text-primary);
}
.contact-method:hover {
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
  transform: translateY(-3px);
}

.contact-method-icon {
  width: 50px;
  height: 50px;
  background: rgba(var(--accent1-rgb), 0.08);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--glow-cyan);
  flex-shrink: 0;
  transition: all var(--transition);
}
.contact-method:hover .contact-method-icon {
  background: rgba(var(--accent1-rgb), 0.15);
  box-shadow: 0 0 15px rgba(var(--accent1-rgb), 0.3);
}

.contact-method-info h4 {
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
}
.contact-method-info p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.contact-cta {
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Glowing border CTA box */
.contact-cta-box {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 2.5rem;
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(var(--accent1-rgb), 0.2);
}
.contact-cta-box::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  border-radius: calc(var(--radius-lg) + 2px);
  background: conic-gradient(from 0deg, var(--glow-cyan), var(--glow-purple), var(--glow-green), var(--glow-cyan));
  z-index: -1;
  animation: rotate-border 4s linear infinite;
  opacity: 0.5;
}
@keyframes rotate-border {
  100% { transform: rotate(360deg); }
}

.contact-cta-box::after {
  content: '';
  position: absolute;
  inset: 2px;
  border-radius: calc(var(--radius-lg) - 1px);
  background: var(--bg-card-solid);
  z-index: -1;
}

.contact-cta-box h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}
.contact-cta-box > p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  font-size: 1.05rem;
}
.contact-cta-box ul {
  list-style: none;
  margin-bottom: 1.5rem;
}
.contact-cta-box ul li {
  padding: 0.4rem 0;
  padding-left: 1.5rem;
  position: relative;
  color: var(--text-secondary);
}
.contact-cta-box ul li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--glow-cyan);
  font-weight: bold;
}
.contact-cta-box .btn {
  width: 100%;
  justify-content: center;
}

/* ================================================================
   FOOTER
   ================================================================ */
.footer {
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: 3rem 0 2rem;
  border-top: 1px solid var(--border);
  position: relative;
}
.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--glow-cyan), var(--glow-purple), transparent);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.footer-info h3 {
  background: linear-gradient(135deg, var(--glow-cyan), var(--glow-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.footer-info p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 0.3rem;
}

.footer-social {
  display: flex;
  gap: 1rem;
}
.footer-social a {
  color: var(--text-secondary);
  font-size: 1.3rem;
  transition: all var(--transition);
}
.footer-social a:hover {
  color: var(--glow-cyan);
  text-shadow: 0 0 10px rgba(var(--accent1-rgb), 0.4);
  transform: translateY(-2px);
}

.footer-bottom {
  text-align: center;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ================================================================
   BACK TO TOP
   ================================================================ */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--glow-cyan), var(--glow-purple));
  color: var(--text-on-primary);
  border: none;
  border-radius: 50%;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: 0 0 20px rgba(var(--accent1-rgb), 0.3);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}
.back-to-top:hover {
  box-shadow: 0 0 30px rgba(var(--accent1-rgb), 0.5);
  transform: translateY(-3px);
}

/* ================================================================
   PREFERS REDUCED MOTION
   ================================================================ */
/* ================================================================
   3D FLOATING GEOMETRIC SHAPES (CSS Keyframes)
   ================================================================ */
@keyframes rotate-cube {
  0%   { transform: rotate3d(1, 1, 0, 0deg); }
  100% { transform: rotate3d(1, 1, 0, 360deg); }
}

@keyframes rotate-diamond {
  0%   { transform: rotate(45deg) rotate3d(0, 1, 0, 0deg); }
  100% { transform: rotate(45deg) rotate3d(0, 1, 0, 360deg); }
}

@keyframes rotate-triangle {
  0%   { transform: rotate3d(1, 0, 1, 0deg); }
  100% { transform: rotate3d(1, 0, 1, 360deg); }
}

@keyframes float-shape {
  0%, 100% { translate: 0 0; }
  50%      { translate: 0 -20px; }
}

@keyframes float-shape-reverse {
  0%, 100% { translate: 0 0; }
  50%      { translate: 0 20px; }
}

@keyframes glow-pulse {
  0%, 100% { box-shadow: 0 0 15px rgba(var(--accent1-rgb), 0.15); }
  50%      { box-shadow: 0 0 35px rgba(var(--accent1-rgb), 0.35); }
}

/* Floating shapes for Skills section */
#skills::before {
  content: '';
  position: absolute;
  bottom: 60px;
  right: 50px;
  width: 50px;
  height: 50px;
  border: 1.5px solid rgba(var(--accent2-rgb), 0.3);
  border-radius: 50%;
  animation: rotate-cube 12s linear infinite, float-shape 7s ease-in-out infinite;
  pointer-events: none;
  z-index: 0;
}

#skills::after {
  content: '';
  position: absolute;
  top: 120px;
  left: 30px;
  width: 40px;
  height: 40px;
  border: 1.5px solid rgba(var(--accent3-rgb), 0.3);
  animation: rotate-cube 15s linear infinite reverse, float-shape-reverse 8s ease-in-out infinite;
  pointer-events: none;
  z-index: 0;
}

/* Education floating shapes */
#education::after {
  content: '';
  position: absolute;
  top: 60px;
  right: 80px;
  width: 70px;
  height: 70px;
  border: 1.5px solid rgba(var(--accent3-rgb), 0.25);
  border-radius: 50%;
  animation: rotate-diamond 14s linear infinite, float-shape 6s ease-in-out infinite;
  pointer-events: none;
  z-index: 0;
}

/* Contact floating shapes */
#contact::before {
  content: '';
  position: absolute;
  top: 80px;
  left: 50px;
  width: 45px;
  height: 45px;
  border: 1.5px solid rgba(var(--accent1-rgb), 0.2);
  animation: rotate-cube 9s linear infinite, float-shape-reverse 5s ease-in-out infinite;
  pointer-events: none;
  z-index: 0;
}

#contact::after {
  content: '';
  position: absolute;
  bottom: 100px;
  right: 70px;
  width: 55px;
  height: 55px;
  border: 1.5px solid rgba(var(--accent2-rgb), 0.2);
  border-radius: 8px;
  animation: rotate-diamond 11s linear infinite reverse, float-shape 7s ease-in-out infinite;
  pointer-events: none;
  z-index: 0;
}

/* Glowing accent lines between sections */
.section + .section::before {
  z-index: 2;
}

/* ================================================================
   SECTION DIVIDERS — Glowing Lines
   ================================================================ */
.section-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent 5%, var(--glow-cyan) 30%, var(--glow-purple) 70%, transparent 95%);
  opacity: 0.3;
  margin: 0;
  border: none;
}

/* ================================================================
   THEME TOGGLE BUTTON
   ================================================================ */
.theme-toggle {
  position: relative;
  background: none;
  border: 1.5px solid var(--border);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  transition: all var(--transition);
  flex-shrink: 0;
}
.theme-toggle:hover {
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
  transform: rotate(15deg);
}
.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  position: absolute;
  width: 20px;
  height: 20px;
  transition: opacity 0.3s ease, transform 0.3s ease;
}
/* Light mode: show moon icon (to switch TO dark) */
.theme-toggle .icon-sun  { opacity: 0; transform: rotate(-90deg) scale(0.5); }
.theme-toggle .icon-moon { opacity: 1; transform: rotate(0deg) scale(1); }
/* Dark mode: show sun icon (to switch TO light) */
[data-theme="dark"] .theme-toggle .icon-sun  { opacity: 1; transform: rotate(0deg) scale(1); }
[data-theme="dark"] .theme-toggle .icon-moon { opacity: 0; transform: rotate(90deg) scale(0.5); }

/* ================================================================
   LIGHT-MODE SPECIFIC OVERRIDES
   ================================================================ */

/* Light mode hero overlay — softer on white */
:root:not([data-theme="dark"]) .hero::before {
  background:
    radial-gradient(ellipse at 20% 50%, rgba(var(--accent2-rgb), 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(var(--accent1-rgb), 0.05) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(var(--accent3-rgb), 0.04) 0%, transparent 40%),
    linear-gradient(180deg, transparent 75%, var(--bg-primary) 100%);
}

/* Light mode scanlines — subtler */
:root:not([data-theme="dark"]) .hero::after {
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(var(--accent1-rgb), 0.012) 2px,
    rgba(var(--accent1-rgb), 0.012) 4px
  );
}

/* Light mode glass cards — white with subtle border */
:root:not([data-theme="dark"]) .glass-card,
:root:not([data-theme="dark"]) .about-highlight-card,
:root:not([data-theme="dark"]) .project-card,
:root:not([data-theme="dark"]) .timeline-card,
:root:not([data-theme="dark"]) .education-card,
:root:not([data-theme="dark"]) .skill-category,
:root:not([data-theme="dark"]) .contact-method {
  border-color: rgba(var(--accent2-rgb), 0.1);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}

/* Light mode floating shapes — slightly deeper */
:root:not([data-theme="dark"]) #about::after,
:root:not([data-theme="dark"]) #experience::after,
:root:not([data-theme="dark"]) #skills::before,
:root:not([data-theme="dark"]) #skills::after,
:root:not([data-theme="dark"]) #education::after,
:root:not([data-theme="dark"]) #contact::before,
:root:not([data-theme="dark"]) #contact::after {
  border-width: 2px;
  opacity: 0.6;
}

/* Light mode grid floor — darker lines for visibility on white */
:root:not([data-theme="dark"]) #experience::before {
  background:
    repeating-linear-gradient(
      90deg,
      rgba(var(--accent1-rgb), 0.12) 0px,
      rgba(var(--accent1-rgb), 0.12) 1px,
      transparent 1px,
      transparent 50px
    ),
    repeating-linear-gradient(
      0deg,
      rgba(var(--accent2-rgb), 0.1) 0px,
      rgba(var(--accent2-rgb), 0.1) 1px,
      transparent 1px,
      transparent 50px
    );
}

/* Light-mode avatar ring glow — deeper border */
:root:not([data-theme="dark"]) .hero-avatar-wrapper::before,
:root:not([data-theme="dark"]) .hero-avatar-wrapper::after {
  border-width: 2px;
}

/* Theme transition for major elements */
.navbar,
.hero,
.section,
.section-alt,
.glass-card,
.about-highlight-card,
.project-card,
.timeline-card,
.education-card,
.skill-category,
.contact-method,
.footer,
.back-to-top {
  transition: background 0.4s ease, color 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .cursor-glow { display: none !important; }
  #neural-canvas { display: none !important; }
  #matrix-canvas { display: none !important; }
  #skills-connections { display: none !important; }
}

/* ================================================================
   RESPONSIVE
   ================================================================ */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: rgba(var(--bg-primary-rgb), 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    gap: 1rem;
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }

  .hero .container { flex-direction: column-reverse; text-align: center; gap: 2rem; }
  .hero-content { max-width: 100%; }
  .hero-greeting { justify-content: center; }
  .hero-buttons { justify-content: center; }
  .hero-stats { justify-content: center; }
  .hero-avatar-wrapper { width: 200px; height: 200px; }
  .hero-name { font-size: 2.2rem; }

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

  .projects-grid { grid-template-columns: 1fr; }
  .skills-categories { grid-template-columns: 1fr; }
  .education-cards { grid-template-columns: 1fr; }
  .blog-grid { grid-template-columns: 1fr; }
  .contact-container { grid-template-columns: 1fr; gap: 2rem; }

  .section { padding: 60px 0; }
  .section-title { font-size: 1.6rem; }

  .footer-content { flex-direction: column; text-align: center; }

  .cursor-glow { display: none !important; }

  #experience::before { display: none; }
  #experience::after { display: none; }
  #about::after { display: none; }
  #skills::before, #skills::after { display: none; }
  #education::after { display: none; }
  #contact::before, #contact::after { display: none; }
  .matrix-rain-container { display: none; }
}

@media (max-width: 480px) {
  .hero-name { font-size: 1.8rem; }
  .hero-typing { font-size: 1rem; }
  .hero-stats { gap: 1.5rem; }
  .hero-stat h3 { font-size: 1.4rem; }
  .about-highlights { grid-template-columns: 1fr; }
  .timeline::before { left: 16px; }
  .timeline-item { padding-left: 50px; }
  .timeline-dot { left: 6px; width: 18px; height: 18px; }
}