/* ==========================================================================
   Balavignesh A U — Engineering Portfolio Design System (2026)
   Dark-First Modern Developer Aesthetic • Engineered for Performance & Accessibility
   ========================================================================== */

:root {
  /* Color Tokens - Dark First */
  --bg-primary: #07090e;
  --bg-secondary: #0d111a;
  --bg-tertiary: #131926;
  --bg-card: rgba(15, 21, 34, 0.72);
  --bg-card-hover: rgba(22, 30, 48, 0.88);
  --bg-card-solid: #0f1522;
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(255, 255, 255, 0.15);
  --border-strong: rgba(255, 255, 255, 0.24);
  
  --primary: #6366f1;
  --primary-light: #818cf8;
  --primary-dark: #4f46e5;
  --primary-glow: rgba(99, 102, 241, 0.22);
  
  --cyan: #06b6d4;
  --cyan-glow: rgba(6, 182, 212, 0.2);
  --emerald: #10b981;
  --emerald-glow: rgba(16, 185, 129, 0.2);
  --amber: #f59e0b;
  --rose: #f43f5e;

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

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 5rem;

  /* Radius */
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* Elevation */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 25px var(--primary-glow);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme Variables */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-tertiary: #e2e8f0;
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;
  --bg-card-solid: #ffffff;

  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;

  --border-subtle: rgba(15, 23, 42, 0.08);
  --border-medium: rgba(15, 23, 42, 0.15);
  --border-strong: rgba(15, 23, 42, 0.25);

  --primary: #4f46e5;
  --primary-light: #6366f1;
  --primary-dark: #3730a3;
  --primary-glow: rgba(79, 70, 229, 0.15);
  --cyan: #0284c7;
  --emerald: #059669;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.08);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-primary);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Accessibility: Skip Link */
.skip-link {
  position: absolute;
  top: -60px;
  left: 20px;
  background: var(--primary);
  color: #fff;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  z-index: 9999;
  font-weight: 600;
  text-decoration: none;
  transition: top var(--transition-fast);
}
.skip-link:focus {
  top: 20px;
}

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

ul, ol {
  list-style: none;
}

button, input, textarea {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
  background: transparent;
}

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

/* Containers */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

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

.gradient-text {
  background: linear-gradient(135deg, #ffffff 30%, var(--primary-light) 75%, var(--cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

[data-theme="light"] .gradient-text {
  background: linear-gradient(135deg, #0f172a 30%, var(--primary) 75%, var(--cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ==========================================================================
   Navigation Bar
   ========================================================================== */
.navbar {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(7, 9, 14, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--transition-normal), border var(--transition-normal);
}

[data-theme="light"] .navbar {
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid rgba(15, 23, 42, 0.08);
}

.nav-container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  white-space: nowrap;
  flex-shrink: 0;
}

.brand-monogram {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary) 0%, #3b82f6 100%);
  color: #fff;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  justify-content: center;
  letter-spacing: -0.5px;
  box-shadow: 0 0 16px var(--primary-glow);
  flex-shrink: 0;
}

.brand-name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.3px;
  color: var(--text-primary);
  white-space: nowrap;
}

.brand-accent {
  color: var(--primary-light);
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  padding: 3px 9px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--emerald);
  white-space: nowrap;
  flex-shrink: 0;
}

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

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

[data-theme="light"] .nav-link:hover,
[data-theme="light"] .nav-link.active {
  background: rgba(15, 23, 42, 0.06);
  color: #0f172a;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

/* Theme Toggle Button */
.theme-toggle {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  color: var(--text-primary);
  border-color: var(--border-medium);
  background: rgba(255, 255, 255, 0.1);
}

[data-theme="light"] .theme-toggle {
  background: #f1f5f9;
  border-color: rgba(15, 23, 42, 0.1);
  color: #334155;
}

[data-theme="light"] .theme-toggle:hover {
  background: #e2e8f0;
  color: #0f172a;
}

/* Mobile Toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 38px;
  height: 38px;
  padding: 10px 8px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

[data-theme="light"] .mobile-menu-toggle {
  background: #f1f5f9;
  border-color: rgba(15, 23, 42, 0.1);
}

.mobile-menu-toggle span {
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.mobile-menu-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.mobile-menu-toggle.active span:nth-child(2) {
  opacity: 0;
}
.mobile-menu-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.85rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 4px 14px var(--primary-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.35);
  filter: brightness(1.08);
}

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

[data-theme="light"] .btn-secondary {
  background: #ffffff;
  border-color: rgba(15, 23, 42, 0.15);
  color: #0f172a;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.05);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--primary-light);
  transform: translateY(-2px);
}

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

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--primary);
  color: var(--primary-light);
}

[data-theme="light"] .btn-outline {
  border-color: rgba(15, 23, 42, 0.18);
  color: #0f172a;
}

[data-theme="light"] .btn-outline:hover {
  background: rgba(79, 70, 229, 0.08);
  border-color: var(--primary);
  color: var(--primary);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid transparent;
}

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

[data-theme="light"] .btn-ghost:hover {
  background: rgba(15, 23, 42, 0.05);
  color: #0f172a;
}

.btn-resume {
  background: rgba(99, 102, 241, 0.12);
  color: var(--primary-light);
  border: 1px solid rgba(99, 102, 241, 0.3);
}

[data-theme="light"] .btn-resume {
  background: rgba(79, 70, 229, 0.1);
  color: var(--primary);
  border-color: rgba(79, 70, 229, 0.25);
}

.btn-resume:hover {
  background: var(--primary);
  color: #fff;
}

/* ==========================================================================
   Hero Section & Profile Badge
   ========================================================================== */
.hero-section {
  position: relative;
  min-height: calc(100vh - 72px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--space-3xl) 0 var(--space-2xl);
  overflow: hidden;
}

.hero-backdrop {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.grid-overlay {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse at 50% 40%, black 40%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 40%, black 40%, transparent 80%);
}

[data-theme="light"] .grid-overlay {
  background-image: 
    linear-gradient(to right, rgba(15, 23, 42, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(15, 23, 42, 0.04) 1px, transparent 1px);
}

.glow-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.18;
}

[data-theme="light"] .glow-orb {
  opacity: 0.1;
}

.orb-1 {
  width: 450px;
  height: 450px;
  background: var(--primary);
  top: 10%;
  left: -5%;
}

.orb-2 {
  width: 400px;
  height: 400px;
  background: var(--cyan);
  top: 25%;
  right: -5%;
}

.hero-container {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: var(--space-3xl);
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

/* Hero Profile Avatar Integration */
.hero-profile-row {
  display: flex;
  align-items: center;
  gap: 14px;
}

.hero-photo-ring {
  position: relative;
  width: 62px;
  height: 62px;
  border-radius: 50%;
  padding: 2.5px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--cyan) 100%);
  box-shadow: 0 0 16px var(--primary-glow);
  flex-shrink: 0;
}

.hero-photo-img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  object-position: center 38%;
  background: var(--bg-card);
}

.hero-online-status {
  position: absolute;
  bottom: 2px;
  right: 2px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--emerald);
  border: 2px solid var(--bg-primary);
  box-shadow: 0 0 6px var(--emerald);
}

.badge-role {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.25);
  color: var(--primary-light);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  padding: 5px 12px;
  border-radius: var(--radius-full);
  width: fit-content;
}

[data-theme="light"] .badge-role {
  background: rgba(79, 70, 229, 0.08);
  border-color: rgba(79, 70, 229, 0.22);
  color: var(--primary);
}

.badge-pulse {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--primary-light);
  box-shadow: 0 0 8px var(--primary-light);
}

.hero-headline {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 4.2rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -1.2px;
}

.hero-title-sub {
  font-size: clamp(1.1rem, 2.2vw, 1.35rem);
  font-weight: 500;
  color: var(--text-secondary);
}

.divider-dot {
  color: var(--primary);
  margin: 0 4px;
}

.hero-pitch {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 600px;
}

.hero-pitch strong {
  color: var(--text-primary);
  font-weight: 600;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: var(--space-sm);
}

.hero-quick-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-lg);
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border-subtle);
}

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

.meta-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
}

.meta-value {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Hero Visual: Architecture Card */
.hero-visual {
  position: relative;
}

.system-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 0;
  box-shadow: var(--shadow-lg), 0 0 30px var(--primary-glow);
  overflow: hidden;
  transition: border-color var(--transition-normal);
}

[data-theme="light"] .system-card {
  background: #ffffff;
  border-color: rgba(15, 23, 42, 0.12);
  box-shadow: 0 12px 36px rgba(15, 23, 42, 0.08);
}

.system-card:hover {
  border-color: rgba(99, 102, 241, 0.4);
}

.system-card-header {
  background: rgba(0, 0, 0, 0.3);
  padding: 12px 18px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

[data-theme="light"] .system-card-header {
  background: #f8fafc;
  border-bottom-color: rgba(15, 23, 42, 0.08);
}

.system-terminal-dots {
  display: flex;
  gap: 6px;
}

.system-terminal-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.system-terminal-dots span:nth-child(1) { background: #ef4444; }
.system-terminal-dots span:nth-child(2) { background: #f59e0b; }
.system-terminal-dots span:nth-child(3) { background: #10b981; }

.system-terminal-title {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.system-live-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--emerald);
  display: flex;
  align-items: center;
  gap: 5px;
  font-weight: 600;
}

.live-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--emerald);
}

.system-pipeline-container {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.pipeline-node {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  transition: all var(--transition-normal);
}

[data-theme="light"] .pipeline-node {
  background: #ffffff;
  border-color: rgba(15, 23, 42, 0.08);
}

.pipeline-node:hover,
.pipeline-node.node-active {
  background: rgba(99, 102, 241, 0.08);
  border-color: rgba(99, 102, 241, 0.4);
  transform: translateX(4px);
}

[data-theme="light"] .pipeline-node:hover,
[data-theme="light"] .pipeline-node.node-active {
  background: rgba(79, 70, 229, 0.06);
  border-color: var(--primary);
}

.node-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: rgba(99, 102, 241, 0.15);
  color: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
}

[data-theme="light"] .node-icon {
  background: rgba(79, 70, 229, 0.12);
  color: var(--primary);
}

.node-info {
  display: flex;
  flex-direction: column;
  flex: 1;
}

.node-stage {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}

.node-name {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
}

.node-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.05);
  padding: 3px 8px;
  border-radius: var(--radius-xs);
}

[data-theme="light"] .node-tag {
  background: rgba(15, 23, 42, 0.05);
  color: #475569;
}

.pipeline-flow-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 14px;
  position: relative;
}

.flow-line {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--border-medium);
}

.flow-arrow-icon {
  font-size: 0.65rem;
  color: var(--primary-light);
  z-index: 1;
}

.system-card-footer {
  background: rgba(0, 0, 0, 0.25);
  padding: 10px 18px;
  border-top: 1px solid var(--border-subtle);
}

[data-theme="light"] .system-card-footer {
  background: #f8fafc;
  border-top-color: rgba(15, 23, 42, 0.08);
}

.mono-code {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--emerald);
}

.scroll-prompt {
  display: flex;
  justify-content: center;
  margin-top: var(--space-xl);
}

.scroll-prompt a {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.scroll-prompt a:hover {
  color: var(--text-primary);
}

.scroll-mouse {
  width: 20px;
  height: 32px;
  border: 2px solid var(--border-medium);
  border-radius: 12px;
  position: relative;
  display: flex;
  justify-content: center;
}

.scroll-wheel {
  width: 3px;
  height: 6px;
  background: var(--primary-light);
  border-radius: 2px;
  position: absolute;
  top: 6px;
  animation: scroll-bob 2s infinite ease-in-out;
}

@keyframes scroll-bob {
  0%, 100% { transform: translateY(0); opacity: 1; }
  50% { transform: translateY(8px); opacity: 0.3; }
}

.scroll-caption {
  font-size: 0.75rem;
  letter-spacing: 0.5px;
}

/* ==========================================================================
   Section Headers & Common
   ========================================================================== */
.section {
  padding: var(--space-3xl) 0;
  position: relative;
}

.section-heading {
  margin-bottom: var(--space-2xl);
  max-width: 780px;
}

.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--primary-light);
  margin-bottom: var(--space-xs);
}

[data-theme="light"] .section-tag {
  color: var(--primary);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.8px;
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   About Section (Profile Photo Card + Narrative + Pillars)
   ========================================================================== */
.about-grid {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: var(--space-xl);
  align-items: stretch;
  margin-bottom: var(--space-xl);
}

/* Profile Photo Card */
.about-profile-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

[data-theme="light"] .about-profile-card {
  background: #ffffff;
  border-color: rgba(15, 23, 42, 0.1);
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.04);
}

.about-profile-card:hover {
  border-color: rgba(99, 102, 241, 0.35);
  transform: translateY(-2px);
}

.profile-photo-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1.08;
  overflow: hidden;
  background: var(--bg-secondary);
}

.about-profile-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 40%;
  transition: transform var(--transition-slow);
}

.about-profile-card:hover .about-profile-photo {
  transform: scale(1.03);
}

.profile-photo-details {
  padding: var(--space-md) var(--space-lg) var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
  justify-content: space-between;
}

.profile-header-meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.profile-card-name {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.profile-card-role {
  font-size: 0.88rem;
  color: var(--primary-light);
  font-weight: 500;
}

[data-theme="light"] .profile-card-role {
  color: var(--primary);
}

.profile-meta-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 4px 0 2px;
}

.profile-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  padding: 4px 9px;
  border-radius: var(--radius-full);
}

[data-theme="light"] .profile-pill {
  background: #f1f5f9;
  border-color: rgba(15, 23, 42, 0.1);
  color: #334155;
}

.profile-pill.status-pill-accent {
  color: var(--emerald);
  background: rgba(16, 185, 129, 0.1);
  border-color: rgba(16, 185, 129, 0.25);
}

.pulse-dot-green {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--emerald);
  box-shadow: 0 0 8px var(--emerald);
  flex-shrink: 0;
}

[data-theme="light"] .profile-card-role {
  color: var(--primary);
}

.profile-key-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  padding-top: 10px;
  margin-top: 6px;
  border-top: 1px solid var(--border-subtle);
  text-align: center;
}

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

.p-val {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.p-lbl {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

/* Narrative Card */
.about-narrative-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  box-shadow: var(--shadow-sm);
}

[data-theme="light"] .about-narrative-card {
  background: #ffffff;
  border-color: rgba(15, 23, 42, 0.1);
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.04);
}

.narrative-header {
  display: flex;
  align-items: center;
  gap: 12px;
}

.narrative-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: rgba(99, 102, 241, 0.12);
  color: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

[data-theme="light"] .narrative-icon {
  background: rgba(79, 70, 229, 0.1);
  color: var(--primary);
}

.narrative-header h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-primary);
}

.narrative-text {
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.7;
}

.narrative-text strong {
  color: var(--text-primary);
  font-weight: 600;
}

.narrative-highlights {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: var(--space-xs);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border-subtle);
}

.highlight-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-primary);
}

.highlight-item i {
  color: var(--emerald);
  font-size: 0.85rem;
}

/* Pillars Grid */
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}

.pillar-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  transition: all var(--transition-normal);
}

[data-theme="light"] .pillar-card {
  background: #ffffff;
  border-color: rgba(15, 23, 42, 0.1);
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.03);
}

.pillar-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(99, 102, 241, 0.3);
  transform: translateY(-3px);
}

.pillar-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05);
  color: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  margin-bottom: var(--space-sm);
}

[data-theme="light"] .pillar-icon {
  background: rgba(79, 70, 229, 0.08);
  color: var(--primary);
}

.pillar-card h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.pillar-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ==========================================================================
   Engineering Pipeline: "From Intelligence to Interface"
   ========================================================================== */
.pipeline-section {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.pipeline-track {
  display: flex;
  align-items: stretch;
  gap: 12px;
  margin-bottom: var(--space-2xl);
  overflow-x: auto;
  padding-bottom: 10px;
}

.pipeline-step {
  flex: 1;
  min-width: 190px;
  display: flex;
  flex-direction: column;
}

.step-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--primary-light);
  font-weight: 600;
  margin-bottom: 8px;
}

[data-theme="light"] .step-badge {
  color: var(--primary);
}

.step-card {
  background: var(--bg-card-solid);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: 8px;
  height: 100%;
  transition: all var(--transition-normal);
}

[data-theme="light"] .step-card {
  background: #ffffff;
  border-color: rgba(15, 23, 42, 0.1);
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.03);
}

.step-card:hover {
  border-color: rgba(99, 102, 241, 0.35);
  transform: translateY(-3px);
}

.step-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-xs);
  background: rgba(99, 102, 241, 0.12);
  color: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
}

[data-theme="light"] .step-icon {
  background: rgba(79, 70, 229, 0.1);
  color: var(--primary);
}

.step-card h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

.step-card p {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.45;
  flex: 1;
}

.step-tech {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--cyan);
  background: rgba(6, 182, 212, 0.08);
  padding: 3px 8px;
  border-radius: var(--radius-xs);
  width: fit-content;
  margin-top: 4px;
}

.pipeline-connector {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--border-strong);
  font-size: 0.9rem;
}

.pipeline-proof-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-md);
}

.proof-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

[data-theme="light"] .proof-card {
  background: #ffffff;
  border-color: rgba(15, 23, 42, 0.1);
}

.proof-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--primary-light);
  text-transform: uppercase;
}

[data-theme="light"] .proof-tag {
  color: var(--primary);
}

.proof-card h5 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

.proof-card p {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

/* ==========================================================================
   Professional Experience Section (Internships)
   ========================================================================== */
.timeline-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  position: relative;
}

.timeline-item {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: var(--space-md);
  position: relative;
}

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

.marker-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 3px solid var(--primary);
  box-shadow: 0 0 10px var(--primary-glow);
  z-index: 2;
  margin-top: 14px;
}

.marker-line {
  position: absolute;
  top: 30px;
  bottom: -40px;
  width: 2px;
  background: linear-gradient(to bottom, var(--primary) 0%, var(--border-subtle) 100%);
  z-index: 1;
}

.timeline-content-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  transition: all var(--transition-normal);
}

[data-theme="light"] .timeline-content-card {
  background: #ffffff;
  border-color: rgba(15, 23, 42, 0.1);
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.04);
}

.timeline-content-card:hover {
  border-color: rgba(99, 102, 241, 0.35);
  transform: translateY(-2px);
}

.featured-timeline .timeline-content-card {
  border-color: rgba(99, 102, 241, 0.3);
  background: linear-gradient(135deg, rgba(15, 21, 34, 0.85) 0%, rgba(20, 26, 44, 0.95) 100%);
  box-shadow: 0 8px 32px rgba(99, 102, 241, 0.12);
}

/* Light Theme Fix for Featured Timeline Card */
[data-theme="light"] .featured-timeline .timeline-content-card {
  background: linear-gradient(135deg, #ffffff 0%, #f0f4ff 100%);
  border-color: rgba(99, 102, 241, 0.3);
  box-shadow: 0 8px 24px rgba(99, 102, 241, 0.08);
}

.featured-badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.25) 0%, rgba(6, 182, 212, 0.25) 100%);
  border: 1px solid rgba(99, 102, 241, 0.4);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  margin-bottom: 6px;
  width: fit-content;
}

[data-theme="light"] .featured-badge-pill {
  background: rgba(79, 70, 229, 0.1);
  border-color: rgba(79, 70, 229, 0.3);
  color: var(--primary);
}

.card-top-bar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.role-title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
}

.company-title {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--primary-light);
}

[data-theme="light"] .company-title {
  color: var(--primary);
}

.role-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
}

.role-date {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

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

.role-summary {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.role-bullets {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.role-bullets li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.role-bullets li i {
  color: var(--primary-light);
  margin-top: 5px;
  font-size: 0.75rem;
  flex-shrink: 0;
}

[data-theme="light"] .role-bullets li i {
  color: var(--primary);
}

.role-bullets strong {
  color: var(--text-primary);
}

.tech-chip-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: var(--space-xs);
}

.tech-chip {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  padding: 4px 10px;
  border-radius: var(--radius-xs);
  transition: all var(--transition-fast);
}

[data-theme="light"] .tech-chip {
  background: rgba(15, 23, 42, 0.05);
  border-color: rgba(15, 23, 42, 0.1);
  color: var(--text-secondary);
}

.tech-chip:hover {
  color: var(--text-primary);
  border-color: var(--primary-light);
}

[data-theme="light"] .tech-chip:hover {
  background: rgba(79, 70, 229, 0.1);
  border-color: var(--primary);
  color: var(--primary);
}

/* ==========================================================================
   Key Projects Section
   ========================================================================== */
.project-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: var(--space-xl);
}

.filter-btn {
  padding: 8px 18px;
  border-radius: var(--radius-full);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-fast);
}

[data-theme="light"] .filter-btn {
  background: #ffffff;
  border-color: rgba(15, 23, 42, 0.12);
  color: #334155;
}

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

.filter-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  box-shadow: 0 4px 12px var(--primary-glow);
}

.projects-showcase {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.project-featured-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

[data-theme="light"] .project-featured-card {
  background: #ffffff;
  border-color: rgba(15, 23, 42, 0.1);
  box-shadow: 0 4px 20px rgba(15, 23, 42, 0.05);
}

.project-featured-card:hover {
  border-color: rgba(99, 102, 241, 0.35);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
  transform: translateY(-2px);
}

.project-card-header {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.project-badge-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}

.project-featured-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--amber);
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.25);
  padding: 3px 9px;
  border-radius: var(--radius-full);
}

[data-theme="light"] .project-featured-tag {
  background: rgba(245, 158, 11, 0.12);
  border-color: rgba(245, 158, 11, 0.35);
  color: #b45309;
}

.project-date-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.project-headline {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-primary);
}

.project-subhead {
  font-size: 0.95rem;
  color: var(--primary-light);
  font-weight: 500;
}

[data-theme="light"] .project-subhead {
  color: var(--primary);
}

.project-breakdown-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}

[data-theme="light"] .project-breakdown-grid {
  background: #f8fafc;
  border-color: rgba(15, 23, 42, 0.08);
}

.breakdown-col {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.breakdown-title {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.breakdown-col:nth-child(1) .breakdown-title i { color: var(--rose); }
.breakdown-col:nth-child(2) .breakdown-title i { color: var(--emerald); }

.breakdown-body {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

.capabilities-block {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.capabilities-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.capabilities-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 8px;
}

.capabilities-list li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.capabilities-list li i {
  color: var(--emerald);
  font-size: 0.8rem;
  margin-top: 4px;
  flex-shrink: 0;
}

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

.project-actions {
  display: flex;
  gap: 10px;
}

.projects-cta-footer {
  margin-top: var(--space-2xl);
  padding: var(--space-xl);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

[data-theme="light"] .projects-cta-footer {
  background: #ffffff;
  border-color: rgba(15, 23, 42, 0.1);
}

.cta-text {
  color: var(--text-secondary);
  font-size: 0.98rem;
}

/* ==========================================================================
   Technical Skills Section
   ========================================================================== */
.skills-category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-lg);
}

.skill-category-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  transition: all var(--transition-normal);
}

[data-theme="light"] .skill-category-card {
  background: #ffffff;
  border-color: rgba(15, 23, 42, 0.1);
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.03);
}

.skill-category-card:hover {
  border-color: rgba(99, 102, 241, 0.3);
  transform: translateY(-2px);
}

.highlight-category {
  border-color: rgba(99, 102, 241, 0.35);
  background: linear-gradient(135deg, rgba(15, 21, 34, 0.9) 0%, rgba(22, 28, 48, 0.9) 100%);
}

[data-theme="light"] .highlight-category {
  background: linear-gradient(135deg, #ffffff 0%, #f0f4ff 100%);
  border-color: rgba(99, 102, 241, 0.3);
}

.category-header {
  display: flex;
  align-items: center;
  gap: 12px;
}

.cat-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: rgba(99, 102, 241, 0.12);
  color: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
}

[data-theme="light"] .cat-icon {
  background: rgba(79, 70, 229, 0.1);
  color: var(--primary);
}

.category-header h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

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

.skill-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  padding: 5px 11px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

[data-theme="light"] .skill-pill {
  background: rgba(15, 23, 42, 0.04);
  border-color: rgba(15, 23, 42, 0.1);
  color: var(--text-secondary);
}

.skill-pill:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--border-medium);
}

[data-theme="light"] .skill-pill:hover {
  background: rgba(79, 70, 229, 0.08);
  border-color: var(--primary);
  color: var(--primary);
}

.skill-pill i {
  color: var(--primary-light);
  font-size: 0.85rem;
}

[data-theme="light"] .skill-pill i {
  color: var(--primary);
}

.skill-pill.featured-pill {
  color: #fff;
  background: rgba(99, 102, 241, 0.15);
  border-color: rgba(99, 102, 241, 0.35);
}

[data-theme="light"] .skill-pill.featured-pill {
  background: rgba(79, 70, 229, 0.1);
  border-color: rgba(79, 70, 229, 0.3);
  color: var(--primary);
}

/* ==========================================================================
   Hackathons & Extracurricular Section
   ========================================================================== */
.hackathons-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-md);
}

.hackathon-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: all var(--transition-normal);
}

[data-theme="light"] .hackathon-card {
  background: #ffffff;
  border-color: rgba(15, 23, 42, 0.1);
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.03);
}

.hackathon-card:hover {
  border-color: rgba(99, 102, 241, 0.3);
  transform: translateY(-2px);
}

.hackathon-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--primary-light);
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.25);
  padding: 3px 9px;
  border-radius: var(--radius-full);
  width: fit-content;
  display: flex;
  align-items: center;
  gap: 5px;
}

[data-theme="light"] .hackathon-badge {
  background: rgba(79, 70, 229, 0.1);
  border-color: rgba(79, 70, 229, 0.25);
  color: var(--primary);
}

.hackathon-card h4 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.hackathon-host {
  font-size: 0.85rem;
  color: var(--cyan);
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 500;
}

.hackathon-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
  flex: 1;
}

.hackathon-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.04);
  padding: 3px 8px;
  border-radius: var(--radius-xs);
  width: fit-content;
}

[data-theme="light"] .hackathon-tag {
  background: rgba(15, 23, 42, 0.05);
  color: #475569;
}

/* ==========================================================================
   Certifications & Education Section
   ========================================================================== */
.certs-edu-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
}

.section-heading-compact {
  margin-bottom: var(--space-lg);
}

.subsection-title {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
}

.certs-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.cert-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  transition: all var(--transition-fast);
}

[data-theme="light"] .cert-item {
  background: #ffffff;
  border-color: rgba(15, 23, 42, 0.1);
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.03);
}

.cert-item:hover {
  border-color: rgba(99, 102, 241, 0.3);
  transform: translateX(4px);
}

.cert-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  flex-shrink: 0;
}

.aws-icon { background: rgba(255, 153, 0, 0.15); color: #ff9900; }
.nptel-icon { background: rgba(99, 102, 241, 0.15); color: var(--primary-light); }
.ms-icon { background: rgba(0, 164, 239, 0.15); color: #00a4ef; }

[data-theme="light"] .nptel-icon { color: var(--primary); }

.cert-details h4 {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
}

.cert-issuer {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* Education Cards */
.edu-card-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.edu-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

[data-theme="light"] .edu-card {
  background: #ffffff;
  border-color: rgba(15, 23, 42, 0.1);
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.03);
}

.edu-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--emerald);
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  width: fit-content;
}

.edu-degree {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.edu-inst {
  font-size: 0.92rem;
  color: var(--primary-light);
  font-weight: 500;
}

[data-theme="light"] .edu-inst {
  color: var(--primary);
}

.edu-meta {
  display: flex;
  gap: var(--space-md);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

.edu-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-top: 6px;
}

.secondary-edu {
  background: rgba(255, 255, 255, 0.02);
}

[data-theme="light"] .secondary-edu {
  background: #f8fafc;
}

.github-connect-card {
  background: linear-gradient(135deg, rgba(20, 26, 44, 0.9) 0%, rgba(15, 21, 34, 0.9) 100%);
  border: 1px solid rgba(99, 102, 241, 0.25);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

[data-theme="light"] .github-connect-card {
  background: linear-gradient(135deg, #ffffff 0%, #f0f4ff 100%);
  border-color: rgba(99, 102, 241, 0.25);
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.06);
}

.git-header {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.git-icon {
  font-size: 2rem;
  color: var(--text-primary);
}

.git-header h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.git-header p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

.git-actions {
  margin-top: 4px;
}

/* ==========================================================================
   Contact Section
   ========================================================================== */
.contact-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-3xl) var(--space-2xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-2xl);
  box-shadow: var(--shadow-lg);
}

[data-theme="light"] .contact-box {
  background: #ffffff;
  border-color: rgba(15, 23, 42, 0.1);
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.05);
}

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

.contact-headline {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.8px;
  margin-top: var(--space-xs);
  color: var(--text-primary);
}

.contact-subheadline {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.8px;
  margin-bottom: var(--space-sm);
}

.contact-pitch {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.contact-channels-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-md);
}

.channel-card {
  background: var(--bg-card-solid);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  transition: all var(--transition-fast);
}

[data-theme="light"] .channel-card {
  background: #f8fafc;
  border-color: rgba(15, 23, 42, 0.08);
}

.channel-card:hover {
  border-color: rgba(99, 102, 241, 0.35);
  transform: translateY(-2px);
}

.channel-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: rgba(99, 102, 241, 0.12);
  color: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

[data-theme="light"] .channel-icon {
  background: rgba(79, 70, 229, 0.1);
  color: var(--primary);
}

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

.channel-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.channel-val {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.channel-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 6px 10px;
  border-radius: var(--radius-xs);
  font-size: 0.78rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

[data-theme="light"] .copy-btn {
  background: #ffffff;
  border-color: rgba(15, 23, 42, 0.12);
  color: #334155;
}

.copy-btn:hover {
  color: var(--text-primary);
  border-color: var(--primary-light);
}

.copy-btn.copied {
  background: rgba(16, 185, 129, 0.15);
  border-color: var(--emerald);
  color: var(--emerald);
}

.channel-link-btn {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-xs);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  transition: all var(--transition-fast);
}

[data-theme="light"] .channel-link-btn {
  background: #ffffff;
  border-color: rgba(15, 23, 42, 0.12);
  color: #334155;
}

.channel-link-btn:hover {
  color: var(--primary-light);
  border-color: var(--primary);
}

[data-theme="light"] .channel-link-btn:hover {
  color: var(--primary);
}

/* Contact Form */
.form-wrapper {
  max-width: 680px;
  width: 100%;
  margin: 0 auto;
}

.clean-contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

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

.form-field label {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-field input,
.form-field textarea {
  background: var(--bg-card-solid);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  color: var(--text-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

[data-theme="light"] .form-field input,
[data-theme="light"] .form-field textarea {
  background: #f8fafc;
  border-color: rgba(15, 23, 42, 0.15);
  color: #0f172a;
}

.form-field input:focus,
.form-field textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.btn-submit {
  align-self: flex-start;
  margin-top: 4px;
}

.form-notification {
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  display: none;
}

.form-notification.success {
  display: block;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: var(--emerald);
}

.form-notification.error {
  display: block;
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--rose);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-3xl) 0 var(--space-xl);
}

[data-theme="light"] .site-footer {
  background: #f8fafc;
  border-top-color: rgba(15, 23, 42, 0.08);
}

.footer-container {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer-brand-side {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: 380px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-tagline {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

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

.footer-nav-side {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--space-md);
}

.footer-nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

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

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

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

.footer-socials a {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: all var(--transition-fast);
}

[data-theme="light"] .footer-socials a {
  background: #ffffff;
  border-color: rgba(15, 23, 42, 0.1);
  color: #334155;
}

.footer-socials a:hover {
  color: var(--text-primary);
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.15);
}

[data-theme="light"] .footer-socials a:hover {
  background: rgba(79, 70, 229, 0.1);
  color: var(--primary);
}

.footer-bottom-bar {
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border-subtle);
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Responsive Breakpoints & Media Queries
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-container {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .hero-visual {
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
  }

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

  .profile-photo-wrapper {
    height: 320px;
  }

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

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

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 72px;
    left: 0;
    width: 100%;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-subtle);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-lg);
    gap: var(--space-sm);
    box-shadow: var(--shadow-lg);
    display: none;
  }

  [data-theme="light"] .nav-menu {
    background: #ffffff;
    border-bottom-color: rgba(15, 23, 42, 0.1);
  }

  .nav-menu.active {
    display: flex;
  }

  .nav-menu li {
    width: 100%;
  }

  .nav-link {
    display: block;
    width: 100%;
    padding: 10px 16px;
  }

  .mobile-menu-toggle {
    display: flex;
  }

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

  .pipeline-track {
    flex-direction: column;
  }

  .pipeline-connector {
    transform: rotate(90deg);
    padding: 6px 0;
  }

  .card-top-bar {
    flex-direction: column;
    align-items: flex-start;
  }

  .role-meta {
    align-items: flex-start;
  }

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

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

  .footer-container {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-nav-side {
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .hero-headline {
    font-size: 2.2rem;
  }

  .status-pill {
    display: none;
  }

  .contact-box {
    padding: var(--space-xl) var(--space-md);
  }

  .timeline-item {
    grid-template-columns: 24px 1fr;
    gap: var(--space-sm);
  }
}

/* Accessibility: Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}