:root {
    /* Modern Minimalist Color Palette */
    --primary-50: #f0f9ff;
    --primary-100: #e0f2fe;
    --primary-200: #bae6fd;
    --primary-300: #7dd3fc;
    --primary-400: #38bdf8;
    --primary-500: #0ea5e9; /* Primary blue */
    --primary-600: #0284c7;
    --primary-700: #0369a1;
    --primary-800: #075985;
    --primary-900: #0c4a6e;

    /* Secondary Accent - Emerald */
    --secondary-50: #ecfdf5;
    --secondary-100: #d1fae5;
    --secondary-200: #a7f3d0;
    --secondary-300: #6ee7b7;
    --secondary-400: #34d399;
    --secondary-500: #10b981; /* Secondary green */
    --secondary-600: #059669;
    --secondary-700: #047857;
    --secondary-800: #065f46;
    --secondary-900: #064e3b;

    /* Sophisticated Neutrals */
    --neutral-50: #fafafa;
    --neutral-100: #f5f5f5;
    --neutral-200: #e5e5e5;
    --neutral-300: #d4d4d4;
    --neutral-400: #a3a3a3;
    --neutral-500: #737373;
    --neutral-600: #525252;
    --neutral-700: #404040;
    --neutral-800: #262626;
    --neutral-900: #171717;

    /* Semantic Colors */
    --success: var(--secondary-500);
    --warning: #f59e0b;
    --error: #ef4444;
    --info: var(--primary-500);

    /* Modern Typography Scale */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    
    --text-xs: 0.75rem;      /* 12px */
    --text-sm: 0.875rem;     /* 14px */
    --text-base: 1rem;       /* 16px */
    --text-lg: 1.125rem;     /* 18px */
    --text-xl: 1.25rem;      /* 20px */
    --text-2xl: 1.5rem;      /* 24px */
    --text-3xl: 1.875rem;    /* 30px */
    --text-4xl: 2.25rem;     /* 36px */
    --text-5xl: 3rem;        /* 48px */
    --text-6xl: 3.75rem;     /* 60px */

    /* Line Heights */
    --leading-none: 1;
    --leading-tight: 1.25;
    --leading-snug: 1.375;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    --leading-loose: 2;

    /* Spacing System (8px base unit) */
    --space-0: 0;
    --space-1: 0.25rem;      /* 4px */
    --space-2: 0.5rem;       /* 8px */
    --space-3: 0.75rem;      /* 12px */
    --space-4: 1rem;         /* 16px */
    --space-5: 1.25rem;      /* 20px */
    --space-6: 1.5rem;       /* 24px */
    --space-8: 2rem;         /* 32px */
    --space-10: 2.5rem;      /* 40px */
    --space-12: 3rem;        /* 48px */
    --space-16: 4rem;        /* 64px */
    --space-20: 5rem;        /* 80px */
    --space-24: 6rem;        /* 96px */
    --space-32: 8rem;        /* 128px */

    /* Border Radius */
    --radius-none: 0;
    --radius-sm: 0.125rem;   /* 2px */
    --radius-base: 0.25rem;  /* 4px */
    --radius-md: 0.375rem;   /* 6px */
    --radius-lg: 0.5rem;     /* 8px */
    --radius-xl: 0.75rem;    /* 12px */
    --radius-2xl: 1rem;      /* 16px */
    --radius-3xl: 1.5rem;    /* 24px */
    --radius-full: 9999px;

    /* Shadows - Modern layered approach */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.05);

    /* Glassmorphism Effects */
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
    --backdrop-blur: 10px;

    /* Animations */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    --transition-spring: cubic-bezier(0.68, -0.55, 0.265, 1.55);
    --transition-smooth: cubic-bezier(0.4, 0, 0.2, 1);

    /* Light Theme Variables */
    --primary: var(--primary-500);
    --secondary: var(--secondary-500);
    --background: var(--neutral-50);
    --surface: #ffffff;
    --surface-variant: var(--neutral-100);
    --text-primary: var(--neutral-900);
    --text-secondary: var(--neutral-600);
    --text-muted: var(--neutral-500);
    --border: var(--neutral-200);
    --border-light: var(--neutral-100);
    --overlay: rgba(0, 0, 0, 0.5);

    /* Interactive States */
    --hover-opacity: 0.8;
    --disabled-opacity: 0.5;
    --focus-ring: 0 0 0 3px rgba(14, 165, 233, 0.2);
}

/* Dark Theme */
[data-theme="dark"] {
    --background: var(--neutral-900);
    --surface: var(--neutral-800);
    --surface-variant: var(--neutral-700);
    --text-primary: var(--neutral-100);
    --text-secondary: var(--neutral-300);
    --text-muted: var(--neutral-400);
    --border: var(--neutral-700);
    --border-light: var(--neutral-600);
    --overlay: rgba(0, 0, 0, 0.8);
    
    --glass-bg: rgba(0, 0, 0, 0.2);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.5);
    
    --focus-ring: 0 0 0 3px rgba(56, 189, 248, 0.3);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--space-20);
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--text-primary);
    background: var(--background);
    transition: color var(--transition-base), background-color var(--transition-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* Typography Hierarchy */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
}

/* --- Compact Contact Section --- */
.contact-section-compact {
  padding: var(--space-16) 0;
  background: transparent;
}

.contact-compact-card {
  background: transparent;
  border-radius: 0;
  box-shadow: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
  min-width: 0;
  text-align: center;
}

.contact-compact-title {
  font-size: var(--text-3xl);
  font-weight: 700;
  margin-bottom: var(--space-4);
  color: var(--text-primary);
  position: relative;
  display: inline-block;
}

.contact-compact-title::after {
  content: '';
  position: absolute;
  bottom: -var(--space-2);
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-500), var(--secondary-500));
  border-radius: var(--radius-full);
}

.contact-compact-subtitle {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
  text-align: center;
  max-width: 400px;
}

.contact-compact-icons {
  display: flex;
  flex-direction: row;
  gap: var(--space-6);
  margin-top: var(--space-2);
}

.contact-icon-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--surface-variant);
  box-shadow: var(--shadow-xs);
  transition: background var(--transition-base), box-shadow var(--transition-base), transform var(--transition-fast);
  color: var(--primary);
  text-decoration: none;
  font-size: 0;
  border: none;
}

.contact-icon-link:hover, .contact-icon-link:focus {
  background: var(--primary-100);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px) scale(1.08);
  outline: none;
}

.contact-icon {
  width: 28px;
  height: 28px;
  display: block;
  color: inherit;
}

@media (max-width: 600px) {
  .contact-compact-card {
    padding: var(--space-4) var(--space-2);
  }
  .contact-compact-icons {
    gap: var(--space-3);
  }
  .contact-icon-link {
    width: 40px;
    height: 40px;
  }
  .contact-icon {
    width: 22px;
    height: 22px;
  }
}
    line-height: var(--leading-tight);
    letter-spacing: -0.025em;
    color: var(--text-primary);
}

h1 { font-size: var(--text-4xl); margin-bottom: var(--space-6); }
h2 { font-size: var(--text-3xl); margin-bottom: var(--space-5); }
h3 { font-size: var(--text-2xl); margin-bottom: var(--space-4); }
h4 { font-size: var(--text-xl); margin-bottom: var(--space-3); }
h5 { font-size: var(--text-lg); margin-bottom: var(--space-2); }
h6 { font-size: var(--text-base); margin-bottom: var(--space-2); }

p {
    margin-bottom: var(--space-4);
    color: var(--text-secondary);
    line-height: var(--leading-relaxed);
}

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

a:hover {
    color: var(--primary-600);
}

/* Layout Components */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.section-padding {
    padding: var(--space-20) 0;
}

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

/* Modern Button System */
.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-sm);
    font-weight: 600;
    line-height: var(--leading-none);
    border-radius: var(--radius-lg);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.button:focus {
    outline: none;
    box-shadow: var(--focus-ring);
}

.button:disabled {
    opacity: var(--disabled-opacity);
    cursor: not-allowed;
}

/* Button Variants */
.button-primary {
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    color: white;
    box-shadow: var(--shadow-sm);
}

.button-primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
    background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
}

.button-outline {
    background: var(--surface);
    color: var(--primary);
    border-color: var(--border);
    backdrop-filter: blur(var(--backdrop-blur));
}

.button-outline:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.button-secondary {
    background: linear-gradient(135deg, var(--secondary-500), var(--secondary-600));
    color: white;
    box-shadow: var(--shadow-sm);
}

.button-secondary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
    background: linear-gradient(135deg, var(--secondary-600), var(--secondary-700));
}

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

.button-ghost:hover {
    background: var(--surface-variant);
    color: var(--text-primary);
}

/* Button Sizes */
.button-large {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-base);
}

.button-small {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-xs);
}

.button-icon-only {
    padding: var(--space-3);
    width: auto;
    aspect-ratio: 1;
}

/* Icon System */
.icon {
    width: 1.25rem;
    height: 1.25rem;
    fill: currentColor;
    flex-shrink: 0;
}

.icon-sm { width: 1rem; height: 1rem; }
.icon-lg { width: 1.5rem; height: 1.5rem; }
.icon-xl { width: 2rem; height: 2rem; }

/* Modern Card Design */
.card {
    background: var(--surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-2xl);
    padding: var(--space-6);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary-500), transparent);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-200);
}

.card:hover::before {
    opacity: 0.7;
}

/* Glassmorphism Card Variant */
.card-glass {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--backdrop-blur));
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}

/* Header Styles */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: var(--surface);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
    padding: var(--space-4) 0;
    transition: all var(--transition-base);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-8);
}

.site-title {
    font-size: var(--text-2xl);
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-500), var(--secondary-500));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
}

.site-subtitle {
    font-size: var(--text-sm);
    color: var(--text-muted);
    margin: 0;
    margin-top: var(--space-1);
}

.main-nav {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.nav-link {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--primary-50), var(--secondary-50));
    border-radius: var(--radius-3xl);
    margin: var(--space-8) 0;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, 
        rgba(14, 165, 233, 0.1), 
        rgba(16, 185, 129, 0.1));
    opacity: 0.5;
}

.hero-section > * {
    position: relative;
    z-index: 1;
}

.profile-image-hero {
    width: 120px;
    height: 120px;
    border-radius: var(--radius-full);
    border: 4px solid white;
    box-shadow: var(--shadow-xl);
    margin-bottom: var(--space-6);
    object-fit: cover;
}

.hero-greeting {
    font-size: var(--text-5xl);
    font-weight: 800;
    background: linear-gradient(135deg, var(--text-primary), var(--primary-600));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-4);
}

.hero-tagline {
    font-size: var(--text-xl);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto var(--space-8);
    line-height: var(--leading-relaxed);
}

.hero-cta-group {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    flex-wrap: wrap;
}

/* Section Headers */
.section-header {
    text-align: center;
    margin-bottom: var(--space-16);
}

.section-title {
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -var(--space-2);
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-500), var(--secondary-500));
    border-radius: var(--radius-full);
}

.section-subtitle {
    font-size: var(--text-lg);
    color: var(--text-muted);
    margin-top: var(--space-3);
    margin-bottom: 0;
}

/* Grid Systems */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-6); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-6); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-6); }

.grid-auto { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: var(--space-6); }

/* About Section */
.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: left;
}

.achievements-grid-inline {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
    margin-top: var(--space-12);
    padding: var(--space-8);
    background: var(--surface);
    border-radius: var(--radius-2xl);
    border: 1px solid var(--border-light);
}

.achievement-item-inline {
    text-align: center;
}

.achievement-figure {
    display: block;
    font-size: var(--text-4xl);
    font-weight: 800;
    color: var(--primary);
    line-height: var(--leading-none);
    margin-bottom: var(--space-2);
}

.achievement-label-inline {
    font-size: var(--text-sm);
    color: var(--text-muted);
    font-weight: 500;
}

/* Timeline Component */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--primary-500), var(--secondary-500));
}

.timeline-item {
    position: relative;
    margin-bottom: var(--space-12);
    padding-left: var(--space-20);
}

.timeline-icon {
    position: absolute;
    left: 0;
    top: 0;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-500), var(--secondary-500));
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-2xl);
    box-shadow: var(--shadow-lg);
    border: 4px solid var(--background);
}

.timeline-content {
    position: relative;
}

.job-title {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.company-info {
    font-size: var(--text-base);
    color: var(--text-muted);
    margin-bottom: var(--space-4);
    font-weight: 500;
}

.responsibilities {
    list-style: none;
    padding: 0;
}

.responsibilities li {
    position: relative;
    padding-left: var(--space-6);
    margin-bottom: var(--space-2);
    color: var(--text-secondary);
    line-height: var(--leading-relaxed);
}

.responsibilities li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: bold;
}

/* Skills & Certifications */
.skills-cert-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
    align-items: start;
}

.column-title {
    font-size: var(--text-xl);
    font-weight: 700;
    margin-bottom: var(--space-6);
    color: var(--text-primary);
}

.skills-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
}

.skill-tag {
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    color: white;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: 600;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.skill-tag:hover {
    transform: translateY(-2px) scale(1.05);
    box-shadow: var(--shadow-md);
}

.skill-tag::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.5s;
}

.skill-tag:hover::before {
    left: 100%;
}

.certifications-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.certification-item {
    padding: var(--space-4);
}

.certification-title {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-1);
}

.certification-issuer {
    font-size: var(--text-sm);
    color: var(--text-muted);
    margin: 0;
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-8);
}

.project-card {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.project-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: var(--radius-xl);
    margin-bottom: var(--space-4);
    transition: transform var(--transition-base);
}

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

.project-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.project-title {
    font-size: var(--text-xl);
    font-weight: 700;
    margin-bottom: var(--space-3);
    color: var(--text-primary);
}

.project-description {
    flex: 1;
    margin-bottom: var(--space-4);
    line-height: var(--leading-relaxed);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-6);
}

.tech-tag {
    background: var(--surface-variant);
    color: var(--text-secondary);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-base);
    font-size: var(--text-xs);
    font-weight: 500;
    border: 1px solid var(--border);
}

.project-link {
    margin-top: auto;
    align-self: flex-start;
}

/* Enhanced Contact Section */
.contact-section {
    background: linear-gradient(135deg, var(--primary-50), var(--secondary-50));
    border-radius: var(--radius-3xl);
    margin: var(--space-16) 0;
    position: relative;
    overflow: hidden;
}

.contact-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, 
        rgba(14, 165, 233, 0.05), 
        rgba(16, 185, 129, 0.05));
    opacity: 0.8;
}

.contact-container {
    position: relative;
    z-index: 1;
}

.contact-content {
    max-width: 1000px;
    margin: 0 auto;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-6);
    margin-top: var(--space-12);
}

/* Contact Info Card */
.contact-info-card {
    background: var(--surface);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-light);
}

.contact-info-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    margin-bottom: var(--space-6);
}

.contact-avatar {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-500), var(--secondary-500));
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-4);
    color: white;
    box-shadow: var(--shadow-lg);
}

.contact-info-title {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.contact-description {
    color: var(--text-secondary);
    line-height: var(--leading-relaxed);
    margin-bottom: var(--space-6);
    text-align: center;
}

.contact-highlights {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.contact-highlight-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    background: var(--surface-variant);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    transition: all var(--transition-base);
}

.contact-highlight-item:hover {
    background: var(--primary-50);
    border-color: var(--primary-200);
    transform: translateX(4px);
}

.contact-highlight-item .icon {
    color: var(--primary);
    flex-shrink: 0;
}

.contact-highlight-item span {
    font-weight: 500;
    color: var(--text-primary);
}

/* Social Connections Card */
.social-connections-card {
    background: var(--surface);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-light);
}

.social-card-title {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
    text-align: center;
}

.social-card-subtitle {
    color: var(--text-muted);
    text-align: center;
    margin-bottom: var(--space-8);
}

.social-links-enhanced {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    margin-bottom: var(--space-8);
}

.social-link-enhanced {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-4);
    background: var(--surface-variant);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    text-decoration: none;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.social-link-enhanced::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(14, 165, 233, 0.1), transparent);
    transition: left 0.5s ease;
}

.social-link-enhanced:hover::before {
    left: 100%;
}

.social-link-enhanced:hover {
    background: var(--primary-50);
    border-color: var(--primary-200);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.social-icon-container {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-500), var(--secondary-500));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
    box-shadow: var(--shadow-sm);
}

.social-link-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.social-platform {
    font-weight: 600;
    color: var(--text-primary);
    font-size: var(--text-base);
}

.social-handle {
    font-size: var(--text-sm);
    color: var(--text-muted);
}

/* Contact CTA */
.contact-cta {
    text-align: center;
    padding: var(--space-6);
    background: var(--primary-50);
    border-radius: var(--radius-xl);
    border: 1px solid var(--primary-100);
}

.contact-cta-text {
    margin-bottom: var(--space-4);
    color: var(--text-secondary);
    font-weight: 500;
}

.contact-email-btn {
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    color: white;
    border: none;
    padding: var(--space-3) var(--space-6);
    font-weight: 600;
    box-shadow: var(--shadow-md);
}

.contact-email-btn:hover {
    background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Legacy styles for compatibility */
.contact-invitation {
    font-size: var(--text-lg);
    margin-bottom: var(--space-8);
    color: var(--text-secondary);
}

.contact-email-button {
    margin-bottom: var(--space-8);
    font-size: var(--text-lg);
    padding: var(--space-4) var(--space-10);
}

.social-links-connect {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
}

.social-link-item {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-full);
    background: var(--surface);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.social-link-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    top: var(--space-6);
    right: var(--space-6);
    z-index: 100;
    width: 50px;
    height: 50px;
    border-radius: var(--radius-full);
    background: var(--surface);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(10px);
    transition: all var(--transition-base);
}

.theme-toggle:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-xl);
}

/* Footer */
.site-footer {
    background: var(--surface);
    border-top: 1px solid var(--border-light);
    padding: var(--space-12) 0;
    margin-top: var(--space-24);
}

.site-footer p {
    margin-bottom: var(--space-2);
    color: var(--text-muted);
}

.heart-emoji {
    color: var(--error);
    animation: heartbeat 2s ease-in-out infinite;
}

@keyframes heartbeat {
    0%, 50%, 100% { transform: scale(1); }
    25%, 75% { transform: scale(1.1); }
}

/* Talks Section */
.talks-section {
    background: var(--surface);
    border-radius: var(--radius-3xl);
    border: 1px solid var(--border-light);
    backdrop-filter: blur(10px);
}

.talks-grid {
    display: grid;
    gap: var(--space-8);
    max-width: 1000px;
    margin: 0 auto;
}

.talk-card {
    background: var(--surface);
    border-radius: var(--radius-2xl);
    border: 1px solid var(--border-light);
    overflow: hidden;
    transition: all var(--transition-base);
    backdrop-filter: blur(10px);
}

.talk-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.talk-video {
    position: relative;
    width: 100%;
}

.video-container {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    height: 0;
    overflow: hidden;
    background: var(--surface-variant);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.talk-content {
    padding: var(--space-8);
}

.talk-title {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
    line-height: var(--leading-tight);
}

.talk-venue {
    font-size: var(--text-sm);
    color: var(--primary);
    font-weight: 600;
    margin-bottom: var(--space-4);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.talk-description {
    color: var(--text-secondary);
    line-height: var(--leading-relaxed);
    margin-bottom: var(--space-6);
}

.talk-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-6);
}

.talk-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    text-decoration: none;
}

.talk-link svg {
    transition: transform var(--transition-base);
}

.talk-link:hover svg {
    transform: translateX(2px);
}

/* Responsive Design for Talks */
@media (max-width: 768px) {
    .talks-grid {
        gap: var(--space-6);
    }
    
    .talk-content {
        padding: var(--space-6);
    }
    
    .talk-title {
        font-size: var(--text-lg);
    }
    
    .video-container {
        border-radius: var(--radius-xl);
    }
}

@media (max-width: 1024px) {
    .container {
        padding: 0 var(--space-4);
    }
    
    .skills-cert-columns {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }
    
    .achievements-grid-inline {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }
}

@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        gap: var(--space-4);
        text-align: center;
    }
    
    .main-nav {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .hero-greeting {
        font-size: var(--text-4xl);
    }
    
    .hero-tagline {
        font-size: var(--text-lg);
    }
    
    .hero-cta-group {
        flex-direction: column;
        align-items: center;
    }
    
    .timeline::before {
        left: 15px;
    }
    
    .timeline-item {
        padding-left: var(--space-16);
    }
    
    .timeline-icon {
        width: 40px;
        height: 40px;
        font-size: var(--text-lg);
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .social-links-connect {
        flex-wrap: wrap;
    }
    
    .section-padding {
        padding: var(--space-12) 0;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-3);
    }
    
    .achievements-grid-inline {
        padding: var(--space-4);
    }
    
    .timeline-item {
        padding-left: var(--space-12);
    }
    
    .timeline-icon {
        width: 30px;
        height: 30px;
        font-size: var(--text-base);
    }
    
    .skill-tag {
        font-size: var(--text-xs);
        padding: var(--space-1) var(--space-3);
    }
    
    .theme-toggle {
        width: 40px;
        height: 40px;
        top: var(--space-4);
        right: var(--space-4);
    }
}

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

/* High contrast mode */
@media (prefers-contrast: high) {
    :root {
        --border: var(--neutral-800);
        --border-light: var(--neutral-700);
    }
    
    [data-theme="dark"] {
        --border: var(--neutral-300);
        --border-light: var(--neutral-400);
    }
}

/* Focus visible for keyboard navigation */
.button:focus-visible,
a:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .theme-toggle,
    .social-links-connect {
        display: none;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid var(--neutral-300);
    }
    
    .hero-section,
    .contact-section {
        background: none;
    }
}