/* ==========================================================================
   Colton Williams Portfolio - Modern Design System & Styles
   ========================================================================== */

/* Modern CSS Color Scheme & Variables */
:root {
  color-scheme: light dark;

  /* Typography */
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Radiant Accent Palette */
  --accent-cyan: #06b6d4;
  --accent-cyan-glow: rgba(6, 182, 212, 0.35);
  --accent-violet: #8b5cf6;
  --accent-violet-glow: rgba(139, 92, 246, 0.35);
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;

  /* Light / Dark Mode Color Definitions using light-dark() */
  --bg-primary: light-dark(#f8fafc, #07090e);
  --bg-secondary: light-dark(#f1f5f9, #0d121d);
  --bg-card: light-dark(rgba(255, 255, 255, 0.85), rgba(15, 23, 42, 0.72));
  --bg-card-hover: light-dark(rgba(255, 255, 255, 0.98), rgba(24, 34, 58, 0.85));
  --bg-glass: light-dark(rgba(255, 255, 255, 0.65), rgba(15, 23, 42, 0.55));
  --bg-subtle: light-dark(#e2e8f0, #1e293b);

  /* Text Colors */
  --text-main: light-dark(#0f172a, #f8fafc);
  --text-muted: light-dark(#475569, #94a3b8);
  --text-faint: light-dark(#64748b, #64748b);
  --text-inverse: light-dark(#ffffff, #07090e);

  /* Borders & Dividers */
  --border-subtle: light-dark(rgba(203, 213, 225, 0.7), rgba(255, 255, 255, 0.08));
  --border-card: light-dark(rgba(226, 232, 240, 0.85), rgba(255, 255, 255, 0.12));
  --border-highlight: light-dark(rgba(6, 182, 212, 0.5), rgba(6, 182, 212, 0.6));

  /* Shadows */
  --shadow-sm: light-dark(0 1px 3px rgba(0,0,0,0.05), 0 2px 8px rgba(0,0,0,0.4));
  --shadow-card: light-dark(0 10px 30px -10px rgba(0,0,0,0.08), 0 15px 35px -10px rgba(0,0,0,0.6));
  --shadow-glow: light-dark(0 12px 40px -10px rgba(6,182,212,0.15), 0 12px 40px -10px rgba(6,182,212,0.3));

  /* Layout */
  --max-width: 1200px;
  --header-height: 76px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.28s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Explicit Scheme Mappings according to modern-web-guidance */
:root:has(> head > meta[name="color-scheme"][content="dark"]) {
  color-scheme: dark;
}
:root:has(> head > meta[name="color-scheme"][content="light"]) {
  color-scheme: light;
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  -webkit-font-smoothing: antialiased;
}

/* Ambient Background Lights */
.ambient-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
  opacity: light-dark(0.3, 0.45);
  transition: opacity var(--transition-slow);
}

.glow-1 {
  width: 500px;
  height: 500px;
  top: -150px;
  right: -100px;
  background: radial-gradient(circle, var(--accent-cyan), transparent 70%);
}

.glow-2 {
  width: 600px;
  height: 600px;
  top: 30%;
  left: -200px;
  background: radial-gradient(circle, var(--accent-violet), transparent 70%);
}

.glow-3 {
  width: 500px;
  height: 500px;
  bottom: 10%;
  right: -150px;
  background: radial-gradient(circle, var(--accent-cyan), transparent 70%);
}

.grid-overlay {
  position: fixed;
  inset: 0;
  background-image: 
    linear-gradient(to right, light-dark(rgba(0,0,0,0.03), rgba(255,255,255,0.02)) 1px, transparent 1px),
    linear-gradient(to bottom, light-dark(rgba(0,0,0,0.03), rgba(255,255,255,0.02)) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse at center, rgba(0,0,0,1) 40%, transparent 80%);
  pointer-events: none;
  z-index: 0;
}

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

.gradient-text {
  background: linear-gradient(135deg, var(--accent-cyan) 0%, #38bdf8 50%, var(--accent-violet) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.highlight {
  color: var(--accent-cyan);
  font-weight: 600;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--accent-cyan) 0%, #0284c7 100%);
  color: #ffffff;
  box-shadow: 0 4px 18px rgba(6, 182, 212, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(6, 182, 212, 0.45);
  background: linear-gradient(135deg, #22d3ee 0%, #0369a1 100%);
}

.btn-secondary {
  background: var(--bg-subtle);
  color: var(--text-main);
  border-color: var(--border-subtle);
}

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

.btn-glass {
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  color: var(--text-main);
  border-color: var(--border-card);
}

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

.btn-secondary-compact {
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  color: var(--text-main);
  backdrop-filter: blur(8px);
}

.btn-secondary-compact:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  transform: translateY(-1px);
}

.btn-large {
  padding: 1rem 2rem;
  font-size: 1.05rem;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: 100;
  background: light-dark(rgba(248, 250, 252, 0.8), rgba(7, 9, 14, 0.8));
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: all var(--transition-normal);
}

.header-container {
  max-width: var(--max-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.logo-symbol {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--accent-cyan);
  background: light-dark(rgba(6, 182, 212, 0.1), rgba(6, 182, 212, 0.15));
  padding: 0.25rem 0.55rem;
  border-radius: var(--radius-sm);
  border: 1px solid light-dark(rgba(6, 182, 212, 0.25), rgba(6, 182, 212, 0.35));
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  position: relative;
  transition: color var(--transition-fast);
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-cyan);
  transition: width var(--transition-normal);
  border-radius: var(--radius-full);
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-main);
  backdrop-filter: blur(8px);
  transition: all var(--transition-normal);
}

.theme-toggle-btn:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  transform: rotate(15deg);
}

/* Theme Icon Display logic with CSS light-dark() / meta */
.sun-icon {
  display: none;
}
.moon-icon {
  display: block;
}

:root:has(> head > meta[name="color-scheme"][content="dark"]) .sun-icon {
  display: block;
}
:root:has(> head > meta[name="color-scheme"][content="dark"]) .moon-icon {
  display: none;
}

:root:has(> head > meta[name="color-scheme"][content="light"]) .sun-icon {
  display: none;
}
:root:has(> head > meta[name="color-scheme"][content="light"]) .moon-icon {
  display: block;
}

/* Mobile Nav Toggle */
.mobile-nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 26px;
  height: 19px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.mobile-nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--text-main);
  border-radius: 2px;
  transition: all var(--transition-normal);
}

/* Main Content Layout */
main {
  position: relative;
  z-index: 1;
}

.section-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 5rem 1.5rem;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 3.5rem auto;
}

.section-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-full);
  background: light-dark(rgba(6, 182, 212, 0.1), rgba(6, 182, 212, 0.12));
  color: var(--accent-cyan);
  border: 1px solid light-dark(rgba(6, 182, 212, 0.25), rgba(6, 182, 212, 0.3));
  margin-bottom: 0.85rem;
}

.section-title {
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  letter-spacing: -0.02em;
  margin-bottom: 0.85rem;
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 1.05rem;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
  padding: 4.5rem 1.5rem 5rem 1.5rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero-container {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 3.5rem;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.95rem;
  border-radius: var(--radius-full);
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  backdrop-filter: blur(8px);
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-emerald);
  box-shadow: 0 0 10px var(--accent-emerald);
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0% { transform: scale(0.95); opacity: 0.7; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.7; }
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 3.85rem);
  letter-spacing: -0.03em;
  line-height: 1.12;
  margin-bottom: 1.25rem;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 2rem;
  max-width: 580px;
}

/* DYNAMIC EXPERIENCE COUNTER CARD (Hero) */
.experience-counter-card {
  position: relative;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 1.25rem 1.75rem;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  margin-bottom: 2.25rem;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.experience-counter-card:hover {
  border-color: var(--border-highlight);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

.counter-glow {
  position: absolute;
  top: -50px;
  right: -50px;
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-cyan-glow), transparent 70%);
  pointer-events: none;
}

.counter-num-box {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
}

.counter-number {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 800;
  line-height: 1;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-violet));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.counter-unit {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
}

.counter-label-box {
  display: flex;
  flex-direction: column;
}

.counter-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.01em;
}

.counter-sub {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-bottom: 2.5rem;
}

.hero-stat-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.stat-pill {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.9rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  color: var(--text-muted);
  backdrop-filter: blur(8px);
}

.pill-number {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-cyan);
}

/* Portrait Card */
.hero-visual {
  display: flex;
  justify-content: center;
}

.portrait-card {
  position: relative;
  width: 100%;
  max-width: 440px;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  padding: 1rem;
  box-shadow: var(--shadow-card);
  transition: all var(--transition-normal);
}

.portrait-card:hover {
  border-color: var(--border-highlight);
  box-shadow: var(--shadow-glow);
  transform: translateY(-4px);
}

.portrait-ambient-glow {
  position: absolute;
  inset: -15px;
  background: linear-gradient(135deg, var(--accent-cyan-glow), var(--accent-violet-glow));
  border-radius: calc(var(--radius-xl) + 10px);
  filter: blur(28px);
  z-index: -1;
  opacity: 0.6;
}

.portrait-image-wrapper {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 1 / 1;
  background-color: var(--bg-subtle);
}

.portrait-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  display: block;
  transition: transform var(--transition-slow);
}

.portrait-card:hover .portrait-img {
  transform: scale(1.025);
}

.portrait-glass-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0.5rem 0.25rem 0.5rem;
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.status-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-cyan);
  box-shadow: 0 0 10px var(--accent-cyan);
  animation: pulse-dot 2.5s infinite;
}

.status-text {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-main);
}

.location-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  background: var(--bg-subtle);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
}

/* ==========================================================================
   About Section
   ========================================================================== */
.about-section {
  background: light-dark(rgba(241, 245, 249, 0.45), rgba(13, 18, 29, 0.45));
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.about-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 2.5rem;
  align-items: stretch;
}

.about-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
}

.quote-card {
  position: relative;
  justify-content: center;
  background: linear-gradient(145deg, var(--bg-card), light-dark(rgba(6, 182, 212, 0.05), rgba(6, 182, 212, 0.08)));
  border-left: 4px solid var(--accent-cyan);
}

.quote-mark {
  font-family: var(--font-heading);
  font-size: 6rem;
  line-height: 1;
  color: light-dark(rgba(6, 182, 212, 0.15), rgba(6, 182, 212, 0.2));
  position: absolute;
  top: 1rem;
  left: 1.5rem;
  pointer-events: none;
}

.hacker-quote {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 500;
  line-height: 1.5;
  color: var(--text-main);
  margin-bottom: 1.75rem;
  position: relative;
  z-index: 1;
  font-style: italic;
}

.quote-caption {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.bio-heading {
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
  letter-spacing: -0.01em;
}

.bio-paragraph {
  color: var(--text-muted);
  font-size: 1rem;
  margin-bottom: 1.25rem;
  line-height: 1.75;
}

.dynamic-highlight {
  color: var(--accent-cyan);
  font-weight: 700;
}

.achievements-container {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-top: auto;
}

.achievement-callout {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 1.15rem 1.25rem;
  background: light-dark(rgba(245, 158, 11, 0.08), rgba(245, 158, 11, 0.12));
  border: 1px solid light-dark(rgba(245, 158, 11, 0.25), rgba(245, 158, 11, 0.3));
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.achievement-callout:hover {
  border-color: light-dark(#d97706, #f59e0b);
  transform: translateY(-2px);
}

.trophy-icon {
  font-size: 1.85rem;
  line-height: 1;
}

.callout-text strong {
  display: block;
  font-size: 0.95rem;
  color: light-dark(#b45309, #fbbf24);
  margin-bottom: 0.2rem;
}

.callout-text span {
  font-size: 0.84rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.timeline-award-badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.85rem;
  background: light-dark(rgba(245, 158, 11, 0.1), rgba(245, 158, 11, 0.15));
  border: 1px solid light-dark(rgba(245, 158, 11, 0.3), rgba(245, 158, 11, 0.4));
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  color: light-dark(#b45309, #fbbf24);
  margin-bottom: 0.85rem;
}

.timeline-award-badge strong {
  color: light-dark(#92400e, #fef3c7);
}

/* ==========================================================================
   MOST USED TECHNOLOGIES PANEL
   ========================================================================== */
.technologies-section {
  position: relative;
}

.tech-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2.5rem;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-card);
}

.tech-category-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tech-tab {
  padding: 0.55rem 1.15rem;
  border-radius: var(--radius-full);
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tech-tab:hover {
  color: var(--text-main);
  background: var(--bg-subtle);
}

.tech-tab.active {
  background: light-dark(rgba(6, 182, 212, 0.12), rgba(6, 182, 212, 0.18));
  color: var(--accent-cyan);
  border-color: light-dark(rgba(6, 182, 212, 0.35), rgba(6, 182, 212, 0.45));
}

.tech-search-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  min-width: 260px;
}

.search-icon {
  position: absolute;
  left: 0.85rem;
  color: var(--text-faint);
  pointer-events: none;
}

.tech-search-input {
  width: 100%;
  padding: 0.55rem 2.2rem 0.55rem 2.5rem;
  border-radius: var(--radius-full);
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 0.88rem;
  outline: none;
  transition: all var(--transition-fast);
}

.tech-search-input:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.2);
}

.tech-clear-btn {
  position: absolute;
  right: 0.85rem;
  background: none;
  border: none;
  font-size: 1.1rem;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
}

/* Technologies Grid */
.tech-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3.5rem;
}

.tech-card {
  position: relative;
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  overflow: hidden;
}

.tech-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-highlight);
  box-shadow: var(--shadow-card);
  background: var(--bg-card-hover);
}

.tech-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.tech-icon-box {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  background: light-dark(rgba(6, 182, 212, 0.1), rgba(6, 182, 212, 0.15));
  border: 1px solid light-dark(rgba(6, 182, 212, 0.2), rgba(6, 182, 212, 0.3));
}

.tech-category-pill {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-full);
  background: var(--bg-subtle);
  color: var(--text-muted);
}

.tech-name {
  font-size: 1.2rem;
  margin-bottom: 0.4rem;
  letter-spacing: -0.01em;
}

.tech-desc {
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.55;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.tech-footer {
  margin-top: auto;
  padding-top: 0.85rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.tech-experience-pill {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-cyan);
}

.tech-tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.tech-tag-chip {
  font-size: 0.72rem;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
  color: var(--text-muted);
}

/* Empty State */
.tech-empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 3.5rem 1rem;
  color: var(--text-muted);
}

.tech-empty-state h3 {
  font-size: 1.35rem;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

/* Real-world Impact Banner */
.tech-summary-banner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: var(--shadow-card);
}

.banner-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.banner-icon {
  font-size: 1.75rem;
  line-height: 1;
}

.banner-info h4 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.banner-info p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ==========================================================================
   Experience Timeline
   ========================================================================== */
.experience-section {
  background: light-dark(rgba(241, 245, 249, 0.35), rgba(13, 18, 29, 0.35));
  border-top: 1px solid var(--border-subtle);
}

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

.timeline-container::before {
  content: '';
  position: absolute;
  top: 1.5rem;
  bottom: 1.5rem;
  left: 20px;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent-cyan), var(--accent-violet) 80%, transparent);
}

.timeline-card {
  position: relative;
  margin-left: 50px;
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: var(--shadow-card);
  transition: all var(--transition-normal);
}

.timeline-card:hover {
  border-color: var(--border-highlight);
  transform: translateX(4px);
}

.timeline-card.current-role {
  border-left: 3px solid var(--accent-cyan);
}

.timeline-marker {
  position: absolute;
  top: 2rem;
  left: -40px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 3px solid var(--accent-cyan);
  box-shadow: 0 0 10px var(--accent-cyan-glow);
  z-index: 2;
}

.marker-pulse {
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 2px solid var(--accent-cyan);
  animation: pulse-ring 2s cubic-bezier(0.215, 0.61, 0.355, 1) infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(0.9); opacity: 0.8; }
  100% { transform: scale(2.2); opacity: 0; }
}

.edu-marker {
  border-color: var(--accent-violet);
  box-shadow: 0 0 10px var(--accent-violet-glow);
}

.timeline-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1rem;
}

.company-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: 0.3rem;
}

.edu-tag {
  color: var(--accent-violet);
}

.role-title {
  font-size: 1.35rem;
  letter-spacing: -0.01em;
}

.timeline-period {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.period-badge {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
  background: var(--bg-subtle);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
}

.tenure-badge {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent-cyan);
  background: light-dark(rgba(6, 182, 212, 0.1), rgba(6, 182, 212, 0.15));
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
}

.timeline-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 1.25rem;
}

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

.timeline-tags span {
  font-size: 0.78rem;
  font-weight: 500;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  background: var(--bg-subtle);
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
}

/* ==========================================================================
   Blog / Selected Work Section
   ========================================================================== */
.writing-section {
  position: relative;
}

.blog-spotlight-card {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 3rem;
  align-items: center;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  box-shadow: var(--shadow-card);
}

.blog-visual {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  aspect-ratio: 1 / 1;
}

.blog-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform var(--transition-slow);
}

.blog-spotlight-card:hover .blog-img {
  transform: scale(1.03);
}

.blog-kicker {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent-cyan);
  letter-spacing: 0.05em;
  display: block;
  margin-bottom: 0.75rem;
}

.blog-title {
  font-size: clamp(1.6rem, 2.8vw, 2.2rem);
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.blog-text {
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: 2rem;
}

/* ==========================================================================
   Contact Section
   ========================================================================== */
.contact-section {
  padding-bottom: 5rem;
}

.contact-card {
  text-align: center;
  background: linear-gradient(135deg, var(--bg-card) 0%, light-dark(rgba(6, 182, 212, 0.08), rgba(139, 92, 246, 0.12)) 100%);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  padding: 4.5rem 2rem;
  box-shadow: var(--shadow-card);
  max-width: 800px;
  margin: 0 auto;
}

.contact-title {
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  margin-bottom: 1rem;
}

.contact-subtitle {
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 580px;
  margin: 0 auto 2.5rem auto;
}

.contact-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-secondary);
  padding: 3rem 1.5rem;
}

.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.footer-logo {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  display: block;
  margin-bottom: 0.25rem;
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--accent-cyan);
}

.back-to-top {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-cyan) !important;
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-container {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .hero-visual {
    order: -1;
  }

  .portrait-card {
    max-width: 360px;
  }

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

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

  .blog-spotlight-card {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .blog-visual {
    max-width: 360px;
    margin: 0 auto;
  }
}

@media (max-width: 768px) {
  .site-header {
    height: 68px;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1.25rem;
  }

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

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

  .header-cta {
    display: none;
  }

  .tech-toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .tech-search-wrapper {
    min-width: 100%;
  }

  .tech-summary-banner {
    grid-template-columns: 1fr;
  }

  .timeline-container::before {
    left: 14px;
  }

  .timeline-card {
    margin-left: 36px;
    padding: 1.5rem;
  }

  .timeline-marker {
    left: -29px;
    width: 14px;
    height: 14px;
  }

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