/* Custom Properties & Design Tokens */
:root {
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  
  /* Color Palette - Dark Mode (Default) */
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-surface: rgba(30, 41, 59, 0.7);
  --bg-glass: rgba(15, 23, 42, 0.75);
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --accent-primary: #6366f1;
  --accent-secondary: #a855f7;
  --accent-cyan: #06b6d4;
  --accent-emerald: #10b981;
  
  --gradient-primary: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
  --gradient-text: linear-gradient(135deg, #818cf8 0%, #c084fc 50%, #38bdf8 100%);
  --gradient-glow: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, transparent 70%);

  --border-color: rgba(255, 255, 255, 0.1);
  --border-hover: rgba(99, 102, 241, 0.4);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.15);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 16px 32px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.3);

  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --nav-height: 80px;
}

/* Light Theme Overrides */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-surface: rgba(255, 255, 255, 0.85);
  --bg-glass: rgba(248, 250, 252, 0.85);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;

  --border-color: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(99, 102, 241, 0.5);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 8px 24px rgba(149, 157, 165, 0.1);
  --shadow-lg: 0 16px 32px rgba(149, 157, 165, 0.15);
  --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.2);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

/* Layout Containers */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header & Sticky Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  z-index: 1000;
  transition: background-color var(--transition-normal), backdrop-filter var(--transition-normal), box-shadow var(--transition-normal);
}

.navbar.scrolled {
  background-color: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
  border-bottom: 1px solid var(--border-color);
}

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

.logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

/* Accessibility Skip Link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--accent-primary);
  color: #ffffff;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  z-index: 9999;
  font-weight: 600;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 1rem;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  position: relative;
  padding: 0.5rem 0;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-normal);
  border-radius: var(--radius-full);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Theme Toggle Button */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

.theme-toggle .sun-icon {
  display: none;
}

[data-theme="light"] .theme-toggle .sun-icon {
  display: block;
}

[data-theme="light"] .theme-toggle .moon-icon {
  display: none;
}

/* Mobile Hamburger Menu */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 20px;
  background: transparent;
  cursor: pointer;
  z-index: 1001;
}

.hamburger span {
  width: 100%;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: var(--radius-full);
  transition: all var(--transition-normal);
}

/* Base Section Styling Skeleton */
.section {
  padding: 6rem 0;
  min-height: 80vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 0.5rem;
  position: relative;
}

.section-title span {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 3.5rem;
}

/* ==========================================================================
   Buttons & Action Controls
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.85rem 1.75rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  cursor: pointer;
  text-decoration: none;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.35);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  border-color: var(--accent-primary);
  transform: translateY(-3px);
  background: rgba(99, 102, 241, 0.1);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-hover);
}

.btn-outline:hover {
  background: var(--gradient-primary);
  color: #ffffff;
  border-color: transparent;
  transform: translateY(-3px);
}

/* ==========================================================================
   Hero Section Styling
   ========================================================================== */
.hero-section {
  padding-top: calc(var(--nav-height) + 3rem);
  padding-bottom: 5rem;
  position: relative;
  overflow: hidden;
}

.hero-container {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3rem;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.4rem 1rem;
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.25);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-primary);
  margin-bottom: 1.5rem;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-emerald);
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulse-ring 2s infinite;
}

@keyframes pulse-ring {
  0% {
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  }
  70% {
    box-shadow: 0 0 0 8px rgba(16, 185, 129, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
  }
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 3.25rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

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

.hero-subtitle {
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  min-height: 2.2rem;
}

.typing-text {
  color: var(--accent-cyan);
}

.cursor {
  display: inline-block;
  color: var(--accent-primary);
  font-weight: 300;
  animation: blink 0.8s infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.hero-description {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 2rem;
  max-width: 620px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.hero-socials {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.socials-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
}

.social-icon-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.social-icon-link:hover {
  color: var(--accent-primary);
  border-color: var(--accent-primary);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

/* Glassmorphism Code Visual Card */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.hero-card-glass {
  width: 100%;
  max-width: 420px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(16px);
  overflow: hidden;
  transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.hero-card-glass:hover {
  transform: translateY(-5px);
  border-color: var(--border-hover);
}

.code-header {
  display: flex;
  align-items: center;
  padding: 0.85rem 1.2rem;
  background: rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid var(--border-color);
  gap: 0.5rem;
}

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

.code-title {
  font-family: monospace;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-left: auto;
}

.code-body {
  padding: 1.5rem;
  font-family: 'Fira Code', 'Courier New', monospace;
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--text-primary);
  overflow-x: auto;
}

.key { color: var(--accent-cyan); }
.string { color: var(--accent-emerald); }

/* ==========================================================================
   About Section & Education Timeline
   ========================================================================== */
.about-section {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.about-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 3rem;
  align-items: start;
}

.about-profile-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
  box-shadow: var(--shadow-md);
}

.profile-image-container {
  position: relative;
  width: 150px;
  height: 150px;
  margin: 0 auto 1.5rem auto;
}

.profile-avatar-placeholder {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  color: #ffffff;
  box-shadow: var(--shadow-glow);
}

.profile-badge {
  position: absolute;
  bottom: 0;
  right: -10px;
  background: var(--bg-surface);
  border: 1px solid var(--border-hover);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-cyan);
  box-shadow: var(--shadow-sm);
}

.profile-info h3 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  margin-bottom: 0.3rem;
}

.profile-tagline {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

.profile-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--border-color);
}

.stat-number {
  display: block;
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--accent-primary);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.about-bio-box {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  margin-bottom: 2rem;
}

.about-bio-box h3 {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.about-bio-box p {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1rem;
}

.about-bio-box p:last-child {
  margin-bottom: 0;
}

/* Education Timeline */
.timeline-heading {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 5px;
  bottom: 5px;
  width: 2px;
  background: var(--border-color);
}

.timeline-item {
  position: relative;
  margin-bottom: 2rem;
}

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

.timeline-dot {
  position: absolute;
  left: -2rem;
  top: 5px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent-primary);
  border: 3px solid var(--bg-secondary);
  box-shadow: 0 0 10px var(--accent-primary);
}

.timeline-dot.alt {
  background: var(--accent-secondary);
  box-shadow: 0 0 10px var(--accent-secondary);
}

.timeline-content {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.timeline-content:hover {
  transform: translateX(5px);
  border-color: var(--border-hover);
}

.timeline-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.timeline-header h4 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
}

.timeline-badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  background: rgba(99, 102, 241, 0.15);
  color: var(--accent-primary);
  border: 1px solid rgba(99, 102, 241, 0.3);
}

.timeline-badge.completed {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
  border-color: rgba(16, 185, 129, 0.3);
}

.institution-name {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.95rem;
  margin-bottom: 0.2rem;
}

.university-name {
  font-size: 0.85rem;
  color: var(--accent-cyan);
  margin-bottom: 0.75rem;
}

.timeline-description {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Media Query Responsive Adjustments for Phase 2 */
@media (max-width: 992px) {
  .hero-container,
  .about-grid {
    grid-template-columns: 1fr;
  }
}
/* ==========================================================================
   Skills Section & Categorized Matrix
   ========================================================================== */
.skills-section {
  position: relative;
}

.skills-filter-tabs {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-bottom: 3rem;
}

.filter-tab {
  padding: 0.65rem 1.35rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  transition: all var(--transition-normal);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
}

.filter-tab:hover {
  color: var(--accent-primary);
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.filter-tab.active {
  background: var(--gradient-primary);
  color: #ffffff;
  border-color: transparent;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.35);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.skill-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.skill-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.skill-card.hidden {
  display: none !important;
}

.skill-card-header {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.skill-icon-wrapper {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  flex-shrink: 0;
}

.skill-icon-wrapper.python { color: #ffd343; }
.skill-icon-wrapper.js { color: #f7df1e; }
.skill-icon-wrapper.html-css { color: #e34f26; }
.skill-icon-wrapper.cpp { color: #659ad2; }
.skill-icon-wrapper.node { color: #6cc24a; }
.skill-icon-wrapper.bots { color: #24a1de; }
.skill-icon-wrapper.react { color: #61dafb; }
.skill-icon-wrapper.git { color: #f05032; }
.skill-icon-wrapper.linux { color: #fcc624; }
.skill-icon-wrapper.db { color: #336791; }

.skill-meta {
  flex-grow: 1;
}

.skill-name {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.2rem;
}

.skill-category-tag {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.skill-percentage {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1rem;
  color: var(--accent-cyan);
}

.skill-bar-container {
  width: 100%;
  height: 8px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
}

.skill-bar-fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width 1s ease-in-out;
}

/* ==========================================================================
   Projects Section Styling
   ========================================================================== */
.projects-section {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 2rem;
}

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

.project-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.project-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.2rem;
}

.project-type-badge {
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
  background: rgba(99, 102, 241, 0.12);
  color: var(--accent-primary);
  border: 1px solid rgba(99, 102, 241, 0.25);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.project-type-badge.alt {
  background: rgba(168, 85, 247, 0.12);
  color: var(--accent-secondary);
  border-color: rgba(168, 85, 247, 0.25);
}

.project-type-badge.web {
  background: rgba(6, 182, 212, 0.12);
  color: var(--accent-cyan);
  border-color: rgba(6, 182, 212, 0.25);
}

.project-type-badge.bot {
  background: rgba(16, 185, 129, 0.12);
  color: var(--accent-emerald);
  border-color: rgba(16, 185, 129, 0.25);
}

.project-type-badge.crypto {
  background: rgba(245, 158, 11, 0.12);
  color: #f59e0b;
  border-color: rgba(245, 158, 11, 0.25);
}

.project-github-link {
  font-size: 1.3rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.project-github-link:hover {
  color: var(--accent-primary);
  transform: scale(1.15);
}

.project-title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.project-description {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.project-tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.tech-tag {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.project-footer {
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

.btn-sm {
  padding: 0.55rem 1.15rem;
  font-size: 0.85rem;
  width: 100%;
}

/* ==========================================================================
   Achievements & Certifications Section
   ========================================================================== */
.achievements-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.75rem;
}

.achievement-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem;
  transition: transform var(--transition-normal), border-color var(--transition-normal);
  position: relative;
}

.achievement-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
}

.achievement-icon {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  color: #ffffff;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow-glow);
}

.achievement-card h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  margin-bottom: 0.3rem;
}

.achievement-issuer {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-cyan);
  margin-bottom: 0.85rem;
}

.achievement-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   Resume Download Section
   ========================================================================== */
.resume-section {
  padding: 4rem 0;
}

.resume-card-box {
  background: var(--gradient-primary);
  border-radius: var(--radius-lg);
  padding: 3.5rem 3rem;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  position: relative;
  overflow: hidden;
}

.resume-content {
  max-width: 650px;
}

.resume-icon-badge {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 1rem;
}

.resume-content h2 {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 0.85rem;
}

.resume-content h2 span {
  color: #ffffff;
  text-decoration: underline;
  text-decoration-color: var(--accent-cyan);
}

.resume-content p {
  font-size: 1.05rem;
  opacity: 0.92;
  line-height: 1.65;
  margin-bottom: 1.5rem;
}

.resume-features {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  font-size: 0.9rem;
  font-weight: 600;
}

.resume-features span {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.btn-lg {
  padding: 1.1rem 2.25rem;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
  background: #ffffff;
  color: var(--bg-primary);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.25);
  white-space: nowrap;
}

.btn-lg:hover {
  background: #f1f5f9;
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
}

/* ==========================================================================
   Testimonials Section
   ========================================================================== */
.testimonials-section {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 2rem;
}

.testimonial-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.quote-icon {
  font-size: 2rem;
  color: var(--accent-primary);
  opacity: 0.3;
  margin-bottom: 0.5rem;
}

.testimonial-text {
  font-size: 0.95rem;
  font-style: italic;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-size: 1.1rem;
}

.author-name {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
}

.author-role {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Blog Section
   ========================================================================== */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 2rem;
}

.blog-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem;
  transition: transform var(--transition-normal), border-color var(--transition-normal);
  position: relative;
}

.blog-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
}

.blog-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  background: rgba(6, 182, 212, 0.12);
  color: var(--accent-cyan);
  border: 1px solid rgba(6, 182, 212, 0.25);
  margin-bottom: 1rem;
}

.blog-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.blog-excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

.blog-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
  padding-top: 0.85rem;
}

@media (max-width: 992px) {
  .resume-card-box {
    flex-direction: column;
    text-align: center;
    padding: 2.5rem 1.5rem;
  }
}
/* ==========================================================================
   Contact Section & Interactive Form
   ========================================================================== */
.contact-section {
  position: relative;
}

.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 3rem;
  align-items: start;
}

.contact-info-wrapper {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.contact-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-hover);
}

.contact-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: rgba(99, 102, 241, 0.12);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
}

.contact-icon.github {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-primary);
}

.contact-icon.location {
  background: rgba(16, 185, 129, 0.12);
  color: var(--accent-emerald);
}

.contact-card-content h4 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.2rem;
}

.contact-card-content p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.3rem;
}

.contact-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent-cyan);
  transition: color var(--transition-fast);
}

.contact-link:hover {
  color: var(--accent-primary);
  text-decoration: underline;
}

.location-detail {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.contact-socials-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  text-align: center;
}

.contact-socials-box h4 {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

.social-icons-row {
  display: flex;
  justify-content: center;
  gap: 1rem;
}

.social-btn {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: all var(--transition-fast);
}

.social-btn:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

.social-btn.github:hover { color: #ffffff; border-color: #ffffff; }
.social-btn.email:hover { color: var(--accent-primary); border-color: var(--accent-primary); }
.social-btn.linkedin:hover { color: #0a66c2; border-color: #0a66c2; }
.social-btn.telegram:hover { color: #24a1de; border-color: #24a1de; }

/* Contact Form Styling */
.contact-form-container {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  box-shadow: var(--shadow-md);
}

.contact-form h3 {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
}

.required {
  color: #ef4444;
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-icon {
  position: absolute;
  left: 1rem;
  color: var(--text-muted);
  font-size: 1rem;
  pointer-events: none;
  transition: color var(--transition-fast);
}

.textarea-icon {
  top: 1rem;
}

.form-input {
  width: 100%;
  padding: 0.85rem 1rem 0.85rem 2.75rem;
  font-size: 0.95rem;
  font-family: var(--font-primary);
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.form-input:focus + .input-icon,
.input-wrapper:focus-within .input-icon {
  color: var(--accent-primary);
}

.form-input.invalid {
  border-color: #ef4444;
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.2);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

.error-msg {
  display: none;
  font-size: 0.8rem;
  color: #ef4444;
  margin-top: 0.35rem;
  font-weight: 500;
}

.error-msg.visible {
  display: block;
}

.btn-block {
  width: 100%;
  padding: 0.95rem;
  font-size: 1rem;
  margin-top: 0.5rem;
}

.form-status {
  display: none;
  padding: 1rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  text-align: center;
}

.form-status.success {
  display: block;
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.form-status.error {
  display: block;
  background: rgba(239, 68, 68, 0.15);
  color: #ef4444;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

/* ==========================================================================
   Footer Styling
   ========================================================================== */
.footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding-top: 4rem;
}

.footer-container {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.footer-bio {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.65;
  max-width: 380px;
}

.footer-links-group h4 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 1.2rem;
  color: var(--text-primary);
}

.footer-links-group ul li {
  margin-bottom: 0.65rem;
}

.footer-links-group ul li a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

.footer-links-group ul li a:hover {
  color: var(--accent-primary);
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding: 1.5rem 0;
  background-color: var(--bg-primary);
}

.footer-bottom-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.88rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 1rem;
}

@media (max-width: 992px) {
  .contact-grid,
  .footer-container {
    grid-template-columns: 1fr;
  }
}

/* Media Queries for Responsive Design */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    background-color: var(--bg-primary);
    border-left: 1px solid var(--border-color);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2.5rem;
    transition: right var(--transition-normal);
    box-shadow: var(--shadow-lg);
    overflow-y: auto;
  }

  .nav-menu.open {
    right: 0;
  }

  .hamburger.active span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
  }

  .hamburger.active span:nth-child(2) {
    opacity: 0;
  }

  .hamburger.active span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
  }

  .hero-title {
    font-size: 2.25rem;
    line-height: 1.25;
    word-break: break-word;
  }

  .hero-subtitle {
    font-size: 1.35rem;
    min-height: auto;
  }

  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }

  .hero-cta-group .btn {
    width: 100%;
  }

  .hero-card-glass {
    max-width: 100%;
  }

  .code-body {
    font-size: 0.78rem;
    padding: 1rem 0.75rem;
    white-space: pre-wrap;
    word-break: break-word;
  }
}

@media (max-width: 480px) {
  .container {
    padding-left: 1.15rem;
    padding-right: 1.15rem;
  }

  .section {
    padding: 4rem 0;
  }

  .hero-title {
    font-size: 1.85rem;
  }

  .hero-subtitle {
    font-size: 1.1rem;
  }

  .hero-badge {
    font-size: 0.78rem;
    padding: 0.35rem 0.85rem;
  }

  .section-title {
    font-size: 1.85rem;
  }

  .section-subtitle {
    font-size: 0.9rem;
    margin-bottom: 2rem;
  }

  .code-body {
    font-size: 0.72rem;
    padding: 0.85rem 0.65rem;
  }

  .contact-link {
    word-break: break-all;
  }

  .contact-card {
    padding: 1.15rem;
  }

  .skills-filter-tabs {
    gap: 0.5rem;
  }

  .filter-tab {
    padding: 0.5rem 0.9rem;
    font-size: 0.82rem;
  }

  .footer-bottom-container {
    flex-direction: column;
    text-align: center;
    gap: 0.5rem;
  }
}

/* ==========================================================================
   Scroll-Triggered Reveal Animations
   ========================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1), transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* ==========================================================================
   3D WebGL Canvas Layer
   ========================================================================== */
#webgl-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: -1;
  opacity: 0.85;
  transition: opacity 0.5s ease;
}

/* ==========================================================================
   3D Spatial Tilt & Holographic Card Overlays
   ========================================================================== */
.projects-grid,
.skills-grid,
.about-grid,
.contact-wrapper,
.hero-visual {
  perspective: 1000px;
}

.tilt-card {
  transform-style: preserve-3d;
  will-change: transform;
  transition: transform 0.15s cubic-bezier(0.2, 0, 0.2, 1), box-shadow 0.3s ease, border-color 0.3s ease;
  position: relative;
  overflow: hidden;
}

/* Internal 3D Layer Elevation */
.tilt-card .project-type-badge,
.tilt-card .project-icon-wrapper,
.tilt-card .skill-icon-wrapper,
.tilt-card .btn,
.tilt-card .contact-icon,
.tilt-card .stat-icon {
  transform: translateZ(22px);
  transition: transform 0.2s cubic-bezier(0.2, 0, 0.2, 1);
}

.tilt-card .project-title,
.tilt-card .skill-card-title,
.tilt-card .hero-code-title {
  transform: translateZ(14px);
}

.tilt-card .tech-tag,
.tilt-card .skill-tag {
  transform: translateZ(10px);
}

/* Dynamic Holographic Glare Overlay */
.tilt-card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(600px circle at var(--glare-x, 50%) var(--glare-y, 50%), rgba(255, 255, 255, 0.1), transparent 45%);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.tilt-card:hover::after {
  opacity: 1;
}