/* ========================================
   Data Scientist Portfolio - Stylesheet
   Dark/Modern Theme
   ======================================== */

/* ========================================
   1. CSS VARIABLES (Design Tokens)
   ======================================== */
:root {
  /* === Color Palette (User Provided) === */
  --color-bg-primary: #061E29;
  --color-bg-secondary: #0a2a38;
  --color-bg-tertiary: #1D546D;
  --color-accent: #5F9598;
  --color-accent-light: #7ab0b3;
  --color-text-primary: #F3F4F4;
  --color-text-secondary: #b8c4c4;
  --color-text-muted: #7a8f8f;

  /* Derived Colors */
  --color-border: rgba(95, 149, 152, 0.2);
  --color-border-light: rgba(95, 149, 152, 0.1);
  --color-glass-bg: rgba(6, 30, 41, 0.85);
  --color-glass-border: rgba(95, 149, 152, 0.15);
  --color-card-bg: rgba(29, 84, 109, 0.3);
  --color-card-hover: rgba(29, 84, 109, 0.5);

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #1D546D 0%, #5F9598 100%);
  --gradient-accent: linear-gradient(135deg, #5F9598 0%, #7ab0b3 100%);
  --gradient-text: linear-gradient(135deg, #5F9598 0%, #F3F4F4 50%, #5F9598 100%);

  /* Glow Effects - Disabled for clean lab aesthetic */
  --glow-accent: none;
  --glow-intense: none;

  /* Shadows */
  --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 24px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.6);

  /* === Typography === */
  --font-heading: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Font Sizes (Fluid) */
  --fs-xs: clamp(0.75rem, 1.5vw, 0.875rem);
  --fs-sm: clamp(0.875rem, 2vw, 1rem);
  --fs-base: clamp(1rem, 2.5vw, 1.125rem);
  --fs-lg: clamp(1.125rem, 3vw, 1.25rem);
  --fs-xl: clamp(1.25rem, 3.5vw, 1.5rem);
  --fs-2xl: clamp(1.5rem, 4vw, 2rem);
  --fs-3xl: clamp(2rem, 5vw, 3rem);
  --fs-4xl: clamp(2.5rem, 6vw, 4rem);
  --fs-hero: clamp(2.5rem, 8vw, 5rem);

  /* === Spacing === */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* === Layout === */
  --container-max: 1200px;
  --container-narrow: 800px;
  --nav-height: 70px;
  --section-padding: clamp(4rem, 10vw, 8rem);

  /* === Transitions === */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
  --transition-bounce: 400ms cubic-bezier(0.34, 1.56, 0.64, 1);

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

  /* === Z-Index Scale === */
  --z-below: -1;
  --z-base: 0;
  --z-above: 1;
  --z-dropdown: 100;
  --z-sticky: 500;
  --z-fixed: 900;
  --z-modal: 1000;
}

/* ========================================
   2. CSS RESET & BASE
   ======================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  background: none;
  border: none;
}

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

ul,
ol {
  list-style: none;
}

/* ========================================
   3. TYPOGRAPHY
   ======================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-text-primary);
}

h1 { font-size: var(--fs-hero); }
h2 { font-size: var(--fs-3xl); }
h3 { font-size: var(--fs-2xl); }
h4 { font-size: var(--fs-xl); }
h5 { font-size: var(--fs-lg); }
h6 { font-size: var(--fs-base); }

p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

p:last-child {
  margin-bottom: 0;
}

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

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

/* ========================================
   4. LAYOUT & CONTAINER
   ======================================== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

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

.section-title {
  text-align: left;
  margin-bottom: var(--space-sm);
  font-family: var(--font-mono);
  font-size: var(--fs-xl);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-primary);
}

.section-title span {
  color: var(--color-accent);
}

.section-subtitle {
  text-align: left;
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
  max-width: 600px;
  margin: 0 0 var(--space-2xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border-light);
}

/* ========================================
   5. NAVIGATION
   ======================================== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: var(--z-fixed);
  transition: var(--transition-base);
}

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

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

.nav-logo {
  font-family: var(--font-mono);
  font-size: var(--fs-lg);
  font-weight: 500;
  color: var(--color-text-primary);
  transition: var(--transition-base);
}

.nav-logo:hover {
  color: var(--color-accent);
}

.logo-bracket {
  color: var(--color-accent);
}

.nav-links {
  display: none;
  gap: var(--space-xl);
}

.nav-links a {
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: var(--transition-base);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-accent);
  transition: var(--transition-base);
}

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

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

.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-sm);
  z-index: var(--z-modal);
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  transition: var(--transition-base);
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

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

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Menu */
.nav-mobile {
  position: fixed;
  top: 0;
  right: -100%;
  width: 100%;
  height: 100vh;
  background: var(--color-bg-primary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-xl);
  transition: var(--transition-slow);
  z-index: var(--z-fixed);
}

.nav-mobile.active {
  right: 0;
}

.nav-mobile a {
  font-family: var(--font-heading);
  font-size: var(--fs-2xl);
  color: var(--color-text-secondary);
  transition: var(--transition-base);
}

.nav-mobile a:hover {
  color: var(--color-accent);
}

/* ========================================
   6. HERO SECTION
   ======================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: var(--z-below);
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(ellipse at center, transparent 0%, var(--color-bg-primary) 70%);
  z-index: var(--z-base);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: var(--z-above);
  text-align: left;
  padding: var(--space-xl);
  max-width: 800px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-md);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--fs-xs);
  font-family: var(--font-mono);
  color: var(--color-accent);
  margin-bottom: var(--space-lg);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.hero-title {
  margin-bottom: var(--space-md);
}

.title-line {
  display: block;
  font-size: var(--fs-base);
  font-family: var(--font-mono);
  font-weight: 400;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.title-name {
  display: block;
  font-size: var(--fs-4xl);
  font-weight: 600;
  line-height: 1.1;
  color: var(--color-text-primary);
}

/* Remove gradient text for cleaner look */
.gradient-text {
  background: none;
  -webkit-background-clip: unset;
  -webkit-text-fill-color: var(--color-text-primary);
  background-clip: unset;
}

.hero-tagline {
  font-size: var(--fs-base);
  color: var(--color-text-secondary);
  max-width: 550px;
  margin: 0 0 var(--space-xl);
  line-height: 1.7;
}

.hero-stats {
  display: flex;
  justify-content: flex-start;
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
  flex-wrap: wrap;
  padding: var(--space-md) 0;
  border-top: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
}

.stat-item {
  text-align: left;
}

.stat-value {
  display: inline;
  font-family: var(--font-mono);
  font-size: var(--fs-2xl);
  font-weight: 600;
  color: var(--color-accent);
}

.stat-suffix {
  font-family: var(--font-mono);
  font-size: var(--fs-2xl);
  font-weight: 600;
  color: var(--color-accent);
}

.stat-label {
  display: block;
  font-size: var(--fs-xs);
  font-family: var(--font-mono);
  color: var(--color-text-muted);
  margin-top: var(--space-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hero-cta {
  display: flex;
  justify-content: flex-start;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.scroll-indicator {
  position: absolute;
  bottom: var(--space-2xl);
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
}

.scroll-indicator svg {
  width: 24px;
  height: 24px;
  color: var(--color-text-muted);
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateX(-50%) translateY(0);
  }
  40% {
    transform: translateX(-50%) translateY(-10px);
  }
  60% {
    transform: translateX(-50%) translateY(-5px);
  }
}

/* ========================================
   7. ABOUT SECTION
   ======================================== */
.about-content {
  display: grid;
  gap: var(--space-3xl);
  align-items: center;
}

.about-image {
  position: relative;
  max-width: 350px;
  margin: 0 auto;
}

.image-frame {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 1;
  background: var(--color-card-bg);
}

.image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.image-frame::before {
  content: '';
  position: absolute;
  inset: 0;
  border: 2px solid var(--color-accent);
  border-radius: var(--radius-lg);
  opacity: 0.5;
  z-index: 1;
}

.image-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, var(--color-bg-primary) 0%, transparent 50%);
}

.experience-badge {
  position: absolute;
  bottom: -20px;
  right: -20px;
  background: var(--color-bg-tertiary);
  padding: var(--space-lg);
  border-radius: var(--radius-sm);
  text-align: center;
  border: 1px solid var(--color-border);
}

.exp-years {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--fs-2xl);
  font-weight: 700;
  color: var(--color-text-primary);
}

.exp-label {
  display: block;
  font-size: var(--fs-xs);
  color: var(--color-text-primary);
  opacity: 0.9;
}

.about-text {
  max-width: 600px;
}

.about-subtitle {
  font-size: var(--fs-xl);
  margin-bottom: var(--space-lg);
}

.about-subtitle .highlight {
  color: var(--color-accent);
}

.about-highlights {
  display: grid;
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

.highlight-item {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
}

.highlight-icon {
  font-size: var(--fs-2xl);
  line-height: 1;
  flex-shrink: 0;
}

.highlight-icon svg {
  width: 28px;
  height: 28px;
  color: var(--color-accent);
}

.highlight-text h4 {
  font-size: var(--fs-base);
  margin-bottom: var(--space-xs);
}

.highlight-text p {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  margin: 0;
}

/* ========================================
   8. SKILLS SECTION
   ======================================== */
.skills {
  background: var(--color-bg-secondary);
}

/* Hide radar chart - cleaner lab aesthetic */
.skills-visualization {
  display: none;
}

.skills-grid {
  display: grid;
  gap: var(--space-lg);
}

.skill-category {
  background: transparent;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  padding: var(--space-lg);
  transition: var(--transition-base);
}

.skill-category:hover {
  border-color: var(--color-border);
}

.category-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--fs-base);
  font-family: var(--font-mono);
  font-weight: 500;
  margin-bottom: var(--space-md);
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.category-icon {
  display: flex;
  align-items: center;
}

.category-icon svg {
  width: 16px;
  height: 16px;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.skill-tag {
  padding: var(--space-xs) var(--space-sm);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--fs-sm);
  font-family: var(--font-mono);
  color: var(--color-text-secondary);
  transition: var(--transition-base);
}

.skill-tag:hover {
  border-color: var(--color-accent);
  color: var(--color-text-primary);
}

.skill-tag[data-level="expert"] {
  background: rgba(95, 149, 152, 0.15);
  border-color: var(--color-accent);
  color: var(--color-text-primary);
}

.skill-tag[data-level="advanced"] {
  color: var(--color-text-primary);
}

/* Skill Bars - Compact */
.skill-bars-container {
  max-width: 100%;
  margin-top: var(--space-2xl);
  display: grid;
  gap: var(--space-md);
  padding: var(--space-lg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
}

.skill-bar {
  display: grid;
  grid-template-columns: 140px 1fr auto;
  align-items: center;
  gap: var(--space-md);
}

.skill-bar::before {
  content: attr(data-skill);
  font-size: var(--fs-sm);
  font-family: var(--font-mono);
  color: var(--color-text-secondary);
}

.skill-bar::after {
  content: attr(data-level) '%';
  font-size: var(--fs-sm);
  font-family: var(--font-mono);
  color: var(--color-accent);
}

.skill-bar-track {
  height: 4px;
  background: var(--color-bg-primary);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.skill-bar-fill {
  height: 100%;
  background: var(--color-accent);
  border-radius: var(--radius-sm);
  width: 0;
  transition: width 1s ease-out;
}

/* ========================================
   9. PROJECTS SECTION
   ======================================== */
.project-filters {
  display: flex;
  justify-content: flex-start;
  gap: var(--space-xs);
  margin-bottom: var(--space-xl);
  flex-wrap: wrap;
  border-bottom: 1px solid var(--color-border-light);
  padding-bottom: var(--space-md);
}

.filter-btn {
  padding: var(--space-sm) var(--space-md);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: var(--fs-sm);
  font-family: var(--font-mono);
  color: var(--color-text-muted);
  transition: var(--transition-base);
}

.filter-btn:hover {
  color: var(--color-text-primary);
  background: rgba(95, 149, 152, 0.1);
}

.filter-btn.active {
  background: rgba(95, 149, 152, 0.15);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.projects-grid {
  display: grid;
  gap: var(--space-lg);
}

.project-card {
  background: transparent;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: var(--transition-base);
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent);
  box-shadow: var(--shadow-lg);
}

.project-image {
  position: relative;
  aspect-ratio: 16/10;
  background: var(--color-bg-tertiary);
  overflow: hidden;
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-slow);
}

.project-card:hover .project-image img {
  transform: scale(1.05);
}

.project-overlay {
  position: absolute;
  inset: 0;
  background: rgba(6, 30, 41, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition-base);
}

.project-card:hover .project-overlay {
  opacity: 1;
}

.project-links {
  display: flex;
  gap: var(--space-md);
}

.project-link {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text-primary);
  transition: var(--transition-base);
}

.project-link:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-bg-primary);
}

.project-link svg {
  width: 20px;
  height: 20px;
}

.project-content {
  padding: var(--space-lg);
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.project-tags .tag {
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-bg-primary);
  border-radius: var(--radius-sm);
  font-size: var(--fs-xs);
  font-family: var(--font-mono);
  color: var(--color-accent);
}

.project-title {
  font-size: var(--fs-xl);
  margin-bottom: var(--space-sm);
}

.project-description {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
}

.project-metrics {
  display: flex;
  gap: var(--space-lg);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border-light);
}

.metric {
  text-align: center;
}

.metric-value {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--fs-lg);
  font-weight: 600;
  color: var(--color-accent);
}

.metric-label {
  display: block;
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
}

.projects-cta {
  text-align: center;
  margin-top: var(--space-3xl);
}

/* ========================================
   10. BLOG SECTION
   ======================================== */
.blog {
  background: var(--color-bg-secondary);
}

.blog-grid {
  display: grid;
  gap: var(--space-lg);
}

.blog-card {
  background: transparent;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: var(--transition-base);
}

.blog-card:hover {
  border-color: var(--color-border);
}

.blog-image {
  position: relative;
  aspect-ratio: 16/9;
  background: var(--color-bg-tertiary);
  overflow: hidden;
}

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

.blog-card:hover .blog-image img {
  transform: scale(1.05);
}

.blog-category {
  position: absolute;
  top: var(--space-md);
  left: var(--space-md);
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-bg-primary);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-sm);
  font-size: var(--fs-xs);
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.external-badge {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
}

.blog-content {
  padding: var(--space-lg);
}

.blog-meta {
  display: flex;
  gap: var(--space-md);
  font-size: var(--fs-xs);
  font-family: var(--font-mono);
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.blog-title {
  font-size: var(--fs-lg);
  font-weight: 500;
  margin-bottom: var(--space-sm);
  line-height: 1.4;
}

.blog-title a {
  transition: var(--transition-base);
}

.blog-title a:hover {
  color: var(--color-accent);
}

.blog-excerpt {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.blog-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--color-accent);
  transition: var(--transition-base);
}

.blog-link:hover {
  gap: var(--space-md);
}

.blog-link svg {
  width: 16px;
  height: 16px;
}

.blog-cta {
  text-align: center;
  margin-top: var(--space-3xl);
}

/* ========================================
   11. CONTACT SECTION
   ======================================== */
.contact-content {
  display: grid;
  gap: var(--space-3xl);
}

.contact-info {
  display: grid;
  gap: var(--space-xl);
}

.contact-item {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
}

.contact-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  flex-shrink: 0;
}

.contact-icon svg {
  width: 24px;
  height: 24px;
  color: var(--color-accent);
}

.contact-details h4 {
  font-size: var(--fs-base);
  margin-bottom: var(--space-xs);
}

.contact-details p,
.contact-details a {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
}

.contact-details a:hover {
  color: var(--color-accent);
}

.contact-socials {
  margin-top: var(--space-lg);
}

.contact-socials h4 {
  font-size: var(--fs-base);
  margin-bottom: var(--space-md);
}

.social-links {
  display: flex;
  gap: var(--space-md);
}

.social-links a {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text-secondary);
  transition: var(--transition-base);
}

.social-links a:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-bg-primary);
  transform: translateY(-4px);
}

.social-links svg {
  width: 20px;
  height: 20px;
}

/* Contact Form */
.contact-form {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
}

.form-group {
  margin-bottom: var(--space-lg);
}

.form-group label {
  display: block;
  font-size: var(--fs-sm);
  font-weight: 500;
  margin-bottom: var(--space-sm);
  color: var(--color-text-primary);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--space-md);
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  transition: var(--transition-base);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(95, 149, 152, 0.2);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-muted);
}

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

/* ========================================
   12. FOOTER
   ======================================== */
.footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border-light);
  padding: var(--space-3xl) 0;
}

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

.footer-logo {
  font-family: var(--font-mono);
  font-size: var(--fs-xl);
  font-weight: 500;
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
}

.footer-logo span {
  color: var(--color-accent);
}

.footer-tagline {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-xl);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
  flex-wrap: wrap;
}

.footer-links a {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  transition: var(--transition-base);
}

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

.footer-copyright {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
}

/* ========================================
   13. BUTTONS
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: var(--transition-base);
  cursor: pointer;
  text-decoration: none;
}

.btn svg {
  width: 16px;
  height: 16px;
}

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

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

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

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

.btn-full {
  width: 100%;
}

/* ========================================
   14. UTILITIES & ANIMATIONS
   ======================================== */

/* Fade In Animation */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }
.fade-in-delay-4 { transition-delay: 0.4s; }

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

  .fade-in {
    opacity: 1;
    transform: none;
  }

  html {
    scroll-behavior: auto;
  }
}

/* Selection */
::selection {
  background: var(--color-accent);
  color: var(--color-bg-primary);
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-accent);
}

/* ========================================
   15. RESPONSIVE DESIGN
   ======================================== */

/* Mobile Large - 480px */
@media (min-width: 30em) {
  .hero-stats {
    gap: var(--space-3xl);
  }

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

/* Tablet - 768px */
@media (min-width: 48em) {
  :root {
    --nav-height: 80px;
  }

  .nav-toggle {
    display: none;
  }

  .nav-links {
    display: flex;
  }

  .hero-content {
    padding: var(--space-2xl);
  }

  .about-content {
    grid-template-columns: 350px 1fr;
    gap: var(--space-4xl);
  }

  .about-text {
    max-width: none;
  }

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

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

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

  .contact-content {
    grid-template-columns: 1fr 1fr;
  }
}

/* Laptop - 1024px */
@media (min-width: 64em) {
  .container {
    padding: 0 var(--space-2xl);
  }

  .about-highlights {
    grid-template-columns: repeat(3, 1fr);
  }

  .skills-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* Desktop - 1280px */
@media (min-width: 80em) {
  .projects-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .blog-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Wide - 1536px */
@media (min-width: 96em) {
  :root {
    --container-max: 1400px;
  }
}