/* ==========================================================================
   ELAKKIYA V - MODERN DEVELOPER PORTFOLIO
   Design System & Styling
   ========================================================================== */

/* ---------------- CSS Variables & Themes ---------------- */
:root {
  /* Dark Theme (Default) */
  --bg-primary: #0a0e17;
  --bg-secondary: #0f172a;
  --bg-card: rgba(15, 23, 42, 0.75);
  --bg-card-hover: rgba(30, 41, 59, 0.85);
  --bg-glass: rgba(15, 23, 42, 0.65);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(99, 102, 241, 0.6);
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --accent-primary: #6366f1;       /* Electric Indigo */
  --accent-primary-hover: #4f46e5;
  --accent-secondary: #8b5cf6;     /* Purple */
  --accent-cyan: #06b6d4;          /* Cyan */
  --accent-emerald: #10b981;       /* Green */
  --accent-amber: #f59e0b;         /* Amber */
  --accent-rose: #f43f5e;          /* Rose */
  
  --gradient-brand: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #06b6d4 100%);
  --gradient-card: linear-gradient(135deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0.01) 100%);
  --gradient-glow: radial-gradient(circle, rgba(99, 102, 241, 0.18) 0%, rgba(0, 0, 0, 0) 70%);
  
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 20px 35px -5px rgba(0, 0, 0, 0.7), 0 10px 15px -5px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.35);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Outfit', var(--font-sans);
  --font-mono: 'Fira Code', Consolas, Monaco, monospace;

  --nav-height: 72px;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme Variables */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 0.95);
  --bg-glass: rgba(255, 255, 255, 0.75);
  --border-color: rgba(15, 23, 42, 0.09);
  --border-focus: rgba(79, 70, 229, 0.5);
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  
  --accent-primary: #4f46e5;
  --accent-primary-hover: #4338ca;
  --accent-secondary: #7c3aed;
  --accent-cyan: #0891b2;
  --accent-emerald: #059669;
  
  --gradient-brand: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #0891b2 100%);
  --gradient-card: linear-gradient(135deg, rgba(255, 255, 255, 0.9) 0%, rgba(241, 245, 249, 0.6) 100%);
  --gradient-glow: radial-gradient(circle, rgba(99, 102, 241, 0.08) 0%, rgba(255, 255, 255, 0) 70%);
  
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 20px 35px -5px rgba(0, 0, 0, 0.12), 0 10px 15px -5px rgba(0, 0, 0, 0.06);
  --shadow-glow: 0 0 25px rgba(79, 70, 229, 0.15);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

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

/* Typography Defaults */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.25;
}

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

a:hover {
  color: var(--accent-secondary);
}

p {
  color: var(--text-secondary);
  font-size: 1rem;
}

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

/* Background Canvas & Ambient Glows */
#particleCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -2;
  pointer-events: none;
  opacity: 0.6;
}

.ambient-glow {
  position: fixed;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  filter: blur(120px);
  z-index: -1;
  pointer-events: none;
  opacity: 0.35;
  animation: floatGlow 14s ease-in-out infinite alternate;
}

.glow-1 {
  top: -100px;
  right: -50px;
  background: radial-gradient(circle, #6366f1 0%, rgba(99, 102, 241, 0) 70%);
}

.glow-2 {
  bottom: 10%;
  left: -100px;
  background: radial-gradient(circle, #06b6d4 0%, rgba(6, 182, 212, 0) 70%);
  animation-delay: -7s;
}

@keyframes floatGlow {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(40px, 60px) scale(1.1); }
  100% { transform: translate(-30px, -20px) scale(0.95); }
}

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

.section {
  padding: 5.5rem 0;
  position: relative;
}

.section-header {
  margin-bottom: 3.5rem;
}

.section-tag {
  display: inline-block;
  padding: 0.35rem 0.9rem;
  background: rgba(99, 102, 241, 0.12);
  color: var(--accent-primary);
  border: 1px solid rgba(99, 102, 241, 0.25);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: 2.25rem;
  margin-bottom: 0.75rem;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 650px;
  margin: 0 auto;
}

.text-center {
  text-align: center;
}

/* Gradient Text */
.gradient-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Glassmorphism Card Style */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.glass-card:hover {
  border-color: var(--border-focus);
  box-shadow: var(--shadow-md);
}

/* ---------------- Buttons ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.4rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
  white-space: nowrap;
}

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

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
  border-color: var(--text-secondary);
  transform: translateY(-2px);
}

.btn-glass {
  background: var(--bg-glass);
  color: var(--text-primary);
  border-color: var(--border-color);
  backdrop-filter: blur(10px);
}

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

.btn-outline {
  background: transparent;
  color: var(--accent-primary);
  border-color: var(--accent-primary);
}

.btn-outline:hover {
  background: var(--accent-primary);
  color: #ffffff;
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.btn-sm {
  padding: 0.45rem 0.9rem;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
}

.btn-full {
  width: 100%;
}

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-icon:hover {
  color: var(--accent-primary);
  border-color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.1);
}

/* ---------------- NAVBAR ---------------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  z-index: 100;
  background: rgba(10, 14, 23, 0.8);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

[data-theme="light"] .navbar {
  background: rgba(248, 250, 252, 0.85);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--text-primary);
  text-decoration: none;
}

.logo-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  background: var(--gradient-brand);
  color: #fff;
  border-radius: var(--radius-sm);
  font-weight: 800;
  font-size: 0.9rem;
}

.logo-text .highlight {
  color: var(--accent-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 1.5rem;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  position: relative;
  padding: 0.25rem 0;
}

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

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Theme switch icons */
.theme-btn .sun-icon {
  display: none;
}
.theme-btn .moon-icon {
  display: block;
}

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

.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-around;
  width: 32px;
  height: 32px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.mobile-toggle .bar {
  width: 100%;
  height: 2px;
  background-color: var(--text-primary);
  transition: all var(--transition-fast);
}

/* ---------------- HERO SECTION ---------------- */
.hero-section {
  padding-top: calc(var(--nav-height) + 3.5rem);
  padding-bottom: 4rem;
  min-height: 90vh;
  display: flex;
  align-items: center;
}

.hero-container {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3rem;
  align-items: center;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.9rem;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--accent-emerald);
  margin-bottom: 1.25rem;
}

.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: pulseGreen 1.8s infinite;
}

@keyframes pulseGreen {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-title {
  font-size: 3.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.hero-role-wrapper {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.3rem;
}

.role-prefix {
  color: var(--text-muted);
}

.dynamic-typing {
  color: var(--accent-primary);
  font-family: var(--font-heading);
}

.cursor-blink {
  color: var(--accent-primary);
  animation: blink 1s infinite;
}

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

.hero-description {
  font-size: 1.08rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  max-width: 580px;
}

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

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 2.25rem;
}

.hero-quick-links {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.quick-link-item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.8rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.quick-link-item:hover {
  color: var(--text-primary);
  border-color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.1);
}

.quick-link-item.static {
  cursor: default;
}
.quick-link-item.static:hover {
  border-color: var(--border-color);
  background: var(--bg-glass);
}

.leetcode-icon {
  color: #ffa116;
}

/* Hero Visual: Code Window */
.code-window {
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  background: #080c14;
}

[data-theme="light"] .code-window {
  background: #111827;
  color: #f3f4f6;
}

.code-window-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.window-controls {
  display: flex;
  gap: 6px;
}

.control {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  display: inline-block;
}

.control.close { background: #ef4444; }
.control.minimize { background: #eab308; }
.control.maximize { background: #22c55e; }

.window-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: #94a3b8;
}

.copy-code-btn {
  background: transparent;
  border: none;
  color: #94a3b8;
  cursor: pointer;
  padding: 2px;
  transition: color var(--transition-fast);
}

.copy-code-btn:hover {
  color: #f8fafc;
}

.code-window-body {
  padding: 1.25rem 1.25rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  line-height: 1.6;
}

.token-keyword { color: #f43f5e; font-weight: 600; }
.token-def { color: #38bdf8; }
.token-property { color: #a78bfa; }
.token-string { color: #34d399; }
.token-number { color: #fbbf24; }

.code-window-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 1rem;
  background: rgba(0, 0, 0, 0.3);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.75rem;
  color: #64748b;
  font-family: var(--font-mono);
}

.code-status {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.status-indicator {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #10b981;
}

/* ---------------- STATS SECTION ---------------- */
.stats-section {
  padding: 1rem 0 3.5rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.stat-card {
  padding: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.stat-icon-wrapper {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-sm);
  background: rgba(99, 102, 241, 0.1);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

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

.stat-number {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1;
}

.stat-plus {
  font-size: 1.5rem;
  color: var(--accent-primary);
  font-weight: 800;
}

.stat-label {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
  margin-top: 0.25rem;
}

.stat-sub {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ---------------- ABOUT ME SECTION ---------------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2rem;
}

.about-card {
  padding: 2rem;
}

.about-tabs {
  display: flex;
  gap: 0.75rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.75rem;
  margin-bottom: 1.5rem;
}

.about-tab-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.about-tab-btn:hover {
  color: var(--text-primary);
}

.about-tab-btn.active {
  color: #fff;
  background: var(--accent-primary);
}

.about-tab-content {
  display: none;
  animation: fadeIn 0.4s ease;
}

.about-tab-content.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.about-text {
  margin-bottom: 1.25rem;
  line-height: 1.7;
}

.info-meta-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}

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

.meta-title {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.meta-val {
  font-size: 0.9rem;
  color: var(--text-primary);
  font-weight: 500;
}

.passion-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.passion-list li {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.passion-bullet {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(99, 102, 241, 0.15);
  color: var(--accent-primary);
  font-size: 0.75rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}

.soft-skills-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  color: var(--text-primary);
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-cyan);
}

/* About Right Column Highlights */
.about-highlights-col {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.highlight-box {
  padding: 1.75rem;
}

.highlight-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.icon-avatar {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(99, 102, 241, 0.15);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.leetcode-avatar {
  background: rgba(255, 161, 22, 0.15);
  color: #ffa116;
}

.highlight-title {
  font-size: 1.15rem;
}

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

.highlight-desc {
  font-size: 0.92rem;
  margin-bottom: 1rem;
}

.highlight-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.mini-tag {
  font-size: 0.75rem;
  padding: 0.25rem 0.6rem;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 4px;
  color: var(--text-secondary);
}

.link-with-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: #ffa116;
}

.link-with-arrow:hover {
  text-decoration: underline;
}

/* ---------------- SKILLS SECTION ---------------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.skill-category-card {
  padding: 2rem;
  display: flex;
  flex-direction: column;
}

.category-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.75rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.category-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.icon-code { background: rgba(99, 102, 241, 0.15); color: var(--accent-primary); }
.icon-web { background: rgba(6, 182, 212, 0.15); color: var(--accent-cyan); }
.icon-tools { background: rgba(139, 92, 246, 0.15); color: var(--accent-secondary); }

.category-title {
  font-size: 1.2rem;
}

.category-badge {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.skills-items-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.skill-item {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.skill-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.skill-name-wrap {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.tech-icon {
  font-size: 1.1rem;
}

.skill-name {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
}

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

.skill-bar-bg {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-full);
  overflow: hidden;
}

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

.skill-detail {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

/* ---------------- PROJECTS SECTION ---------------- */
.project-filters {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 0.5rem 1.2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  color: var(--text-primary);
  border-color: var(--accent-primary);
}

.filter-btn.active {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
}

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

.project-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.project-banner {
  height: 160px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.project-hospital { background: linear-gradient(135deg, #1e3a8a 0%, #0284c7 100%); }
.project-traffic { background: linear-gradient(135deg, #1e293b 0%, #0f766e 100%); }
.project-quantum { background: linear-gradient(135deg, #4c1d95 0%, #6366f1 100%); }
.project-rapid { background: linear-gradient(135deg, #831843 0%, #d97706 100%); }

.banner-overlay {
  position: absolute;
  top: 1rem;
  left: 1rem;
}

.banner-badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.3rem 0.7rem;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(8px);
  color: #fff;
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.banner-icon {
  font-size: 3.5rem;
  filter: drop-shadow(0 4px 10px rgba(0, 0, 0, 0.3));
}

.project-body {
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.9rem;
}

.tag {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  background: rgba(99, 102, 241, 0.12);
  color: var(--accent-primary);
  border-radius: 4px;
}

.project-title {
  font-size: 1.35rem;
  margin-bottom: 0.6rem;
}

.project-summary {
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

.project-highlights {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.highlight-item {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.highlight-item svg {
  color: var(--accent-emerald);
  flex-shrink: 0;
  margin-top: 3px;
}

.project-actions {
  margin-top: auto;
}

/* ---------------- INTERACTIVE QUANTUM MINI-LAB ---------------- */
.quantum-lab-card {
  padding: 2.25rem;
  border: 1px solid rgba(99, 102, 241, 0.3);
  box-shadow: 0 0 35px rgba(99, 102, 241, 0.15);
}

.lab-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.75rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
  gap: 1rem;
}

.lab-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.2rem;
}

.gate-toolbar {
  margin-bottom: 1.75rem;
}

.toolbar-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.gate-buttons {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.gate-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 90px;
  height: 68px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.gate-btn:hover {
  border-color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.15);
  transform: translateY(-2px);
}

.gate-letter {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--accent-primary);
}

.gate-sub {
  font-size: 0.65rem;
  color: var(--text-muted);
}

/* Circuit Wires */
.circuit-wireframe {
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  margin-bottom: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.wire-row {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.qubit-label {
  width: 60px;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
}

.q-name { color: var(--accent-cyan); }
.q-init { color: var(--text-muted); }

.wire-line {
  flex-grow: 1;
  height: 36px;
  background: repeating-linear-gradient(90deg, var(--border-color) 0, var(--border-color) 8px, transparent 8px, transparent 16px);
  position: relative;
  display: flex;
  align-items: center;
}

.applied-gates-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding-left: 0.5rem;
  width: 100%;
}

.empty-wire-placeholder {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-style: italic;
}

.active-gate-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  background: var(--gradient-brand);
  color: #fff;
  border-radius: 4px;
  font-weight: 800;
  font-size: 0.9rem;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.4);
  animation: popIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes popIn {
  from { transform: scale(0.5); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.wire-measure {
  width: 32px;
  height: 32px;
  border: 1px dashed var(--border-color);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Quantum Results */
.quantum-results-panel {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 1.5rem;
}

.results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.state-formula {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--accent-cyan);
  font-weight: 700;
  background: rgba(6, 182, 212, 0.1);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
}

.probability-bars {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.prob-item {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.basis-state {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
}

.prob-bar-track {
  height: 10px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.prob-bar-fill {
  height: 100%;
  background: var(--gradient-brand);
  border-radius: var(--radius-full);
  transition: width 0.5s ease;
}

.prob-val {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-primary);
}

.quantum-explainer {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: 0.88rem;
  color: var(--text-secondary);
  padding: 0.85rem 1rem;
  background: rgba(99, 102, 241, 0.08);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent-primary);
}

/* ---------------- TIMELINE SECTION ---------------- */
.timeline-container {
  max-width: 860px;
  margin: 0 auto;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.timeline-item {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 1.5rem;
}

.timeline-marker {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.marker-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent-primary);
  border: 3px solid var(--bg-primary);
  box-shadow: 0 0 0 2px var(--accent-primary);
  z-index: 1;
}

.marker-line {
  width: 2px;
  flex-grow: 1;
  background: var(--border-color);
  margin-top: 0.5rem;
}

.timeline-content {
  padding: 1.75rem;
}

.timeline-badge-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.6rem;
}

.badge-education {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent-cyan);
}

.badge-cert {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent-secondary);
}

.timeline-date {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

.timeline-role {
  font-size: 1.25rem;
  margin-bottom: 0.25rem;
}

.timeline-org {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 0.75rem;
}

.timeline-desc {
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 1rem;
}

.timeline-metric {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.metric-chip {
  font-size: 0.8rem;
  padding: 0.25rem 0.7rem;
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-full);
  color: var(--text-primary);
}

.cert-skills-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* ---------------- CONTACT SECTION ---------------- */
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 2rem;
}

.contact-info-card, .contact-form-card {
  padding: 2.25rem;
}

.contact-card-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.contact-avatar-pill {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-brand);
  color: #fff;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.contact-name {
  font-size: 1.3rem;
}

.contact-status {
  font-size: 0.8rem;
  color: var(--accent-emerald);
  display: block;
}

.contact-intro {
  font-size: 0.92rem;
  margin-bottom: 2rem;
  line-height: 1.6;
}

.contact-channels {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.channel-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
}

.channel-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: rgba(99, 102, 241, 0.1);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.leetcode-bg {
  background: rgba(255, 161, 22, 0.1);
  color: #ffa116;
}

.channel-details {
  display: flex;
  flex-direction: column;
  flex-grow: 1;
  overflow: hidden;
}

.channel-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.channel-value {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Contact Form */
.form-title {
  font-size: 1.4rem;
  margin-bottom: 0.4rem;
}

.form-sub {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
}

.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  background: rgba(255, 255, 255, 0.07);
}

select.form-input option {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

/* ---------------- FOOTER ---------------- */
.footer {
  padding: 3rem 0;
  border-top: 1px solid var(--border-color);
  background: rgba(0, 0, 0, 0.2);
}

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

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-primary);
  text-decoration: none;
}

.footer-tagline {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.footer-nav {
  display: flex;
  gap: 1.25rem;
}

.footer-nav a {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.footer-nav a:hover {
  color: var(--text-primary);
}

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

/* ---------------- MODALS ---------------- */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
  padding: 1.5rem;
}

.modal-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  width: 100%;
  max-width: 820px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: scale(0.95);
  transition: transform var(--transition-normal);
  background: var(--bg-secondary);
}

.modal-backdrop.active .modal-content {
  transform: scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.75rem;
  border-bottom: 1px solid var(--border-color);
}

.modal-title-wrap {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.modal-controls {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.modal-scrollable-body {
  padding: 1.75rem;
  overflow-y: auto;
}

/* Modal Project Details */
.modal-project-badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  background: rgba(99, 102, 241, 0.2);
  color: var(--accent-primary);
  border-radius: var(--radius-full);
}

.project-deepdive-grid {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.deepdive-section h4 {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
  color: var(--accent-cyan);
}

.deepdive-section p {
  font-size: 0.92rem;
  line-height: 1.6;
}

.deepdive-feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.deepdive-feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.deepdive-feature-list li::before {
  content: '▹';
  color: var(--accent-primary);
}

/* Printable Digital Resume Format */
.printable-resume {
  background: #ffffff;
  color: #1f2937;
  padding: 2.5rem;
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
  font-family: var(--font-sans);
}

.resume-sheet-header {
  text-align: center;
  border-bottom: 2px solid #e5e7eb;
  padding-bottom: 1.25rem;
  margin-bottom: 1.5rem;
}

.r-name {
  font-size: 1.9rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: #111827;
}

.r-title {
  font-size: 1rem;
  color: #4b5563;
  margin: 0.25rem 0 0.5rem;
}

.r-contact-line {
  font-size: 0.88rem;
  color: #6b7280;
}

.r-contact-line a {
  color: #4f46e5;
  text-decoration: underline;
}

.r-section {
  margin-bottom: 1.4rem;
}

.r-section-title {
  font-size: 1.05rem;
  font-weight: 700;
  border-bottom: 1px solid #e5e7eb;
  padding-bottom: 0.3rem;
  margin-bottom: 0.6rem;
  color: #111827;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.r-text {
  font-size: 0.9rem;
  line-height: 1.6;
  color: #374151;
}

.r-skills-grid {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.9rem;
  color: #374151;
}

.r-skill-cat {
  color: #111827;
  width: 150px;
  display: inline-block;
}

.r-project-item {
  margin-bottom: 0.9rem;
}

.r-project-name {
  font-size: 0.96rem;
  font-weight: 700;
  color: #111827;
}

.r-bullet-list {
  margin-left: 1.25rem;
  font-size: 0.88rem;
  color: #374151;
  line-height: 1.5;
}

.r-edu-block {
  font-size: 0.9rem;
}

.r-edu-top {
  display: flex;
  justify-content: space-between;
  color: #111827;
}

.r-edu-sub {
  color: #4b5563;
  font-size: 0.88rem;
}

/* ---------------- TOAST NOTIFICATIONS ---------------- */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 300;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.toast {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--accent-emerald);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(12px);
  animation: slideInToast 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes slideInToast {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

.toast.toast-exit {
  animation: slideOutToast 0.3s ease forwards;
}

@keyframes slideOutToast {
  to { transform: translateX(100%); opacity: 0; }
}

/* ---------------- RESPONSIVE BREAKPOINTS ---------------- */
@media (max-width: 1024px) {
  .hero-container {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  
  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    width: 100%;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem;
    transform: translateY(-150%);
    transition: transform var(--transition-normal);
  }

  .nav-menu.open {
    transform: translateY(0);
  }

  .nav-links {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.25rem;
  }

  .mobile-toggle {
    display: flex;
  }

  .nav-resume-btn {
    display: none;
  }

  .hero-title {
    font-size: 2.4rem;
  }

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

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

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

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

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

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

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

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

  .probability-bars {
    grid-template-columns: 1fr;
  }
}

/* Print Stylesheet for Resume */
@media print {
  body * {
    visibility: hidden;
  }
  #printableResume, #printableResume * {
    visibility: visible;
  }
  #printableResume {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    box-shadow: none;
    padding: 0;
  }
}