:root {
  /* Cyber Security Palette */
  --bg-body: #020617;
  /* Deepest Slate */
  --bg-surface: #0f172a;
  /* Slate 900 */
  --bg-surface-hover: #1e293b;
  /* Slate 800 */

  --text-primary: #f8fafc;
  /* Slate 50 */
  --text-secondary: #94a3b8;
  /* Slate 400 */

  /* Cyber Accent: Electric Cyan to Blue */
  --accent: #06b6d4;
  /* Cyan 500 */
  --accent-secondary: #3b82f6;
  /* Blue 500 */
  --accent-glow: rgba(6, 182, 212, 0.3);
  --accent-gradient: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);

  --border: rgba(148, 163, 184, 0.1);
  --shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.5);
  --glass: blur(12px) saturate(150%);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Typography */
  --font-sans: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 2rem;
  --text-4xl: 3.5rem;

  /* Misc */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-full: 9999px;
  --transition: 0.2s ease-out;
  --header-height: 5rem;
}

/* Light Mode Overrides (High Contrast Tech) */
/* Light Mode Overrides (Refined) */
[data-theme="light"] {
  --bg-body: #f1f5f9;
  /* Slate 100 - Softer than pure white */
  --bg-surface: #ffffff;
  --bg-surface-hover: #e2e8f0;
  --text-primary: #0f172a;
  /* Slate 900 */
  --text-secondary: #64748b;
  /* Slate 500 */
  --border: #cbd5e1;
  /* Slate 300 - Stronger border for light mode */
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --accent-glow: rgba(6, 182, 212, 0.1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
  /* Tech Grid Background Pattern */
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 50px 50px;
  background-position: center top;
}

h1,
h2,
h3,
h4,
h5,
h6,
.logo,
.nav-link,
.btn,
.skill-tag,
.timeline-date {
  font-family: var(--font-mono);
  /* Tech feel for headers */
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

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

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: var(--font-mono);
}

/* Utility Infrastructure */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section {
  padding: var(--space-16) 0;
  position: relative;
}

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

.section-title {
  font-size: clamp(2rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: var(--space-12);
  display: inline-flex;
  align-items: center;
  gap: 1rem;
}

.section-title::before {
  content: '#';
  color: var(--accent);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 2rem;
  border-radius: var(--radius-sm);
  /* Sharper corners for tech feel */
  font-weight: 700;
  transition: var(--transition);
  font-size: var(--text-sm);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  gap: 0.5rem;
}

.btn-primary {
  background: var(--accent);
  color: #000;
  /* High contrast on bright cyan */
  box-shadow: 0 0 20px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px var(--accent-glow);
  background: #22d3ee;
  /* Lighter cyan */
}

.btn-outline {
  border: 1px solid var(--border);
  color: var(--text-primary);
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Animations */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* Header / Nav */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: 1000;
  background: rgba(2, 6, 23, 0.8);
  backdrop-filter: var(--glass);
  -webkit-backdrop-filter: var(--glass);
  border-bottom: 1px solid var(--border);
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.05em;
  color: var(--text-primary);
}

.logo::after {
  content: '_';
  color: var(--accent);
  animation: blink 1s infinite;
}

@keyframes blink {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0;
  }
}

.nav-links {
  display: none;
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
    gap: 2.5rem;
  }
}

.nav-link {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  font-weight: 500;
  position: relative;
}

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

.theme-toggle {
  color: var(--text-secondary);
  padding: 0.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: var(--header-height);
  position: relative;
  text-align: center;
  /* Removed overflow hidden to let glow bleed */
}

/* Tech Glow Background */
.hero::before {
  content: '';
  position: absolute;
  top: 20%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  z-index: -1;
  pointer-events: none;
}

.hero-content {
  max-width: 900px;
  z-index: 10;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-title {
  font-size: clamp(3rem, 6vw, 5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--space-6);
  letter-spacing: -0.04em;
}

.hero-title span {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  /* Fallback */
}

.hero-subtitle {
  font-family: var(--font-sans);
  /* Keep body text readable */
  font-size: clamp(1.125rem, 2vw, 1.35rem);
  color: var(--text-secondary);
  margin-bottom: var(--space-12);
  line-height: 1.6;
  max-width: 650px;
}

.hero-actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
}

/* About Section */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  align-items: center;
}

@media (min-width: 900px) {
  .about-grid {
    grid-template-columns: 3fr 2fr;
    gap: var(--space-16);
  }
}

.bio-text {
  color: var(--text-secondary);
  margin-bottom: var(--space-6);
  font-size: var(--text-lg);
  line-height: 1.8;
}

.skill-tag {
  background: var(--bg-surface);
  color: var(--text-primary);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
  border: 1px solid var(--border);
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.skill-icon {
  width: 1.2em;
  height: 1.2em;
}

.skill-tag:hover {
  border-color: var(--accent);
  background: rgba(99, 102, 241, 0.1);
  transform: translateY(-2px);
}

.profile-img {
  width: 100%;
  max-width: 400px;
  aspect-ratio: 1;
  border-radius: var(--radius-lg);
  object-fit: cover;
  background-color: var(--bg-surface);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transform: rotate(3deg);
  transition: var(--transition);
}

.profile-img:hover {
  transform: rotate(0) scale(1.02);
}

/* Projects Section */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 768px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .projects-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Projects Section Updates */
/* Projects Section Updates (Cyber UI) */
.project-card {
  position: relative;
  background: rgba(15, 23, 42, 0.6);
  /* Semi-transparent darker slate */
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  /* Sharper corners */
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  height: 100%;
  backdrop-filter: blur(10px);
}

/* Tech Corners Effect using gradients */
.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border-radius: var(--radius-sm);
  padding: 1px;
  background: linear-gradient(45deg,
      transparent 5%,
      var(--border) 5%,
      var(--border) 95%,
      transparent 95%);
  -webkit-mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
  z-index: 2;
}

/* Hover Glow & Border */
.project-card:hover {
  border-color: var(--accent);
  box-shadow: 0 0 20px rgba(6, 182, 212, 0.15);
  transform: translateY(-5px);
}

.project-card:hover::before {
  opacity: 0;
  /* Hide the mask border on hover to show the real glowing border */
}

/* Scanline Background */
.project-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: repeating-linear-gradient(0deg,
      transparent,
      transparent 2px,
      rgba(6, 182, 212, 0.03) 2px,
      rgba(6, 182, 212, 0.03) 4px);
  pointer-events: none;
  z-index: 1;
}

/* Base styles for coming soon */
.coming-soon-card {
  --border: rgba(6, 182, 212, 0.3);
}

.project-status {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: var(--space-4);
  background: rgba(6, 182, 212, 0.05);
  padding: 0.35rem 0.75rem;
  border: 1px solid rgba(6, 182, 212, 0.2);
  border-radius: var(--radius-sm);
  align-self: flex-start;
  position: relative;
  z-index: 5;
}

.status-dot {
  width: 6px;
  height: 6px;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
  border-radius: 50%;
  animation: pulse-glow 2s infinite;
}

@keyframes pulse-glow {

  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }

  50% {
    opacity: 0.5;
    transform: scale(0.8);
  }
}

/* Content z-index fix */
.project-content {
  position: relative;
  z-index: 10;
  padding: var(--space-6);
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

/* Contact Section Improvements */
.contact-container {
  max-width: 600px;
  margin: 0 auto;
  background: var(--bg-surface);
  padding: 3rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

/* Decorative top border for contact */
.contact-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--accent-gradient);
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 1rem;
  background: var(--bg-body);
  /* Slightly distinct from container */
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-sans);
  transition: all 0.3s ease;
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
  background: var(--bg-surface);
}

.form-textarea {
  min-height: 150px;
  resize: vertical;
}

/* Error state styling */
.form-group.error .form-input,
.form-group.error .form-textarea {
  border-color: #ef4444;
  /* Red 500 */
}

.error-msg {
  color: #ef4444;
  font-size: var(--text-xs);
  margin-top: 0.5rem;
  display: none;
}

.form-group.error .error-msg {
  display: block;
}

/* Valid state checkmark (optional enhancement) */
.form-input:not(:placeholder-shown):valid,
.form-textarea:not(:placeholder-shown):valid {
  border-color: #22c55e;
  /* Green 500 */
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 4rem;
}

.social-btn {
  color: var(--text-secondary);
  transition: var(--transition);
  padding: 1rem;
  border-radius: 50%;
  background: var(--bg-surface);
  border: 1px solid var(--border);
}

.social-btn:hover {
  color: white;
  background: var(--accent-gradient);
  transform: translateY(-4px);
  border-color: transparent;
}

/* Experience/Education Timeline - Enhanced */
.timeline {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  /* Remove default border, using a central line or cleaner layout */
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--space-12);
  padding-left: var(--space-8);
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: -5px;
  top: 0;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg-body);
  border: 2px solid var(--accent);
  box-shadow: 0 0 0 4px var(--bg-body);
  /* Creates spacing illusion */
  transition: var(--transition);
}

.timeline-item:hover .timeline-dot {
  background: var(--accent);
  box-shadow: 0 0 0 6px rgba(6, 182, 212, 0.2);
}

.timeline-date {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--accent);
  background: rgba(6, 182, 212, 0.1);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-2);
}

.timeline-role {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.timeline-company {
  font-size: var(--text-base);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.timeline-company::before {
  content: '//';
  color: var(--border);
}

.timeline-desc {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Disabled Links */
.icon-link.disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
  /* Prevents clicking */
  filter: grayscale(100%);
}

/* Footer & Utils */
.footer {
  text-align: center;
  padding: 4rem 0;
  color: var(--text-secondary);
  font-size: var(--text-sm);
  border-top: 1px solid var(--border);
}

.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--accent-gradient);
  color: white;
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px var(--accent-glow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  z-index: 900;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-6px);
}

/* Media Queries for Mobile Responsiveness */
@media (max-width: 768px) {
  .hero-title {
    font-size: 2.5rem;
  }

  .section {
    padding: var(--space-8) 0;
  }
}