:root {
    --primary-navy: #1e2a38;
    --accent-blue: #1976d2;
    --accent-silver: #b0bec5;
    --background-color: #f7fafc;
    --surface-color: #ffffff;
    --surface-variant: #b0bec5;
    --accent-color: #1976d2;
    --accent-hover: #1560aa;
    --text-primary: #151a21;
    --text-secondary: #1e2a38;
    --text-muted: #6c7580;
    --border-color: #b0bec5;
    --success-color: #009473;
    --warning-color: #ffa500;
    
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.6s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: var(--font-size-base);
}

body {
    font-family: var(--font-family);
    line-height: var(--line-height-base);
    color: var(--text-primary);
    background-color: var(--background-color);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

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

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

section {
    padding: var(--spacing-xxl) 0;
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--accent-color);
    margin: var(--spacing-sm) auto 0;
    border-radius: 2px;
}

.section-subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--background-color) 0%, var(--surface-color) 100%);
    position: relative;
}

.hero-content {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--spacing-xl);
    align-items: center;
    width: 100%;
}

.hero-image {
    display: flex;
    justify-content: center;
}

.headshot-placeholder {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid var(--accent-color);
    transition: transform var(--transition-normal);
}

.headshot-placeholder:hover {
    transform: scale(1.05);
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--accent-color);
    margin-bottom: var(--spacing-md);
    font-weight: 400;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    max-width: 500px;
}

.hero-contact {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.contact-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) 0;
    transition: transform var(--transition-fast);
}

.contact-link:hover {
    transform: translateX(5px);
}

.contact-icon {
    font-size: 1.2rem;
    width: 24px;
    text-align: center;
}

.summary-section {
    background-color: var(--surface-color);
}

.summary-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.summary-content p {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-md);
}

.experience-timeline {
    max-width: 900px;
    margin: 0 auto;
}

.experience-item {
    background: var(--surface-color);
    border-radius: 12px;
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    border-left: 4px solid var(--accent-color);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.experience-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(25, 118, 210, 0.1);
}

.experience-header {
    margin-bottom: var(--spacing-md);
}

.job-title {
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.company-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.company {
    font-weight: 600;
    color: var(--accent-color);
    font-size: 1.1rem;
}

.duration {
    color: var(--text-muted);
    font-size: 0.9rem;
}

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

.job-responsibilities li {
    position: relative;
    padding-left: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

.job-responsibilities li::before {
    content: '▶';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-size: 0.8rem;
}

.skills-section {
    background-color: var(--surface-color);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-xl);
    max-width: 1000px;
    margin: 0 auto;
}

.skills-category {
    background: var(--surface-variant);
    padding: var(--spacing-lg);
    border-radius: 12px;
    transition: transform var(--transition-normal);
}

.skills-category:hover {
    transform: translateY(-3px);
}

.skills-category-title {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.skills-pills {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
}

.skill-pill {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 25px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all var(--transition-normal);
    cursor: default;
    position: relative;
    overflow: hidden;
}

.skill-pill.primary {
    background: var(--accent-color);
    color: white;
}

.skill-pill.secondary {
    background: var(--surface-color);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.skill-pill:hover {
    transform: scale(1.05) translateY(-2px);
    box-shadow: 0 5px 15px rgba(25, 118, 210, 0.3);
}

.skill-pill.primary:hover {
    background: var(--accent-hover);
}

.skill-pill.secondary:hover {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.project-card {
    background: var(--surface-color);
    border-radius: 12px;
    padding: var(--spacing-lg);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    border: 1px solid var(--border-color);
}

.project-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 15px 40px rgba(25, 118, 210, 0.15);
    border-color: var(--accent-color);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.project-title {
    color: var(--text-primary);
    flex: 1;
    min-width: 200px;
}

.project-tag {
    background: var(--accent-color);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    white-space: nowrap;
}

.project-description {
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.project-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--surface-variant);
    border-radius: 8px;
}

.metric {
    text-align: center;
}

.metric-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: var(--spacing-xs);
}

.metric-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.tech-tag {
    background: var(--background-color);
    color: var(--text-secondary);
    padding: 4px var(--spacing-sm);
    border-radius: 15px;
    font-size: 0.8rem;
    border: 1px solid var(--border-color);
}

.contact-section {
    background: var(--surface-color);
}

.contact-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.contact-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--surface-variant);
    border-radius: 12px;
    transition: transform var(--transition-normal);
}

.contact-item:hover {
    transform: translateY(-5px);
}

.contact-item .contact-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.contact-details h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.contact-details a {
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

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

.cta-button {
    display: inline-block;
    background: var(--accent-color);
    color: white;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: 30px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all var(--transition-normal);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.cta-button:hover {
    background: var(--accent-hover);
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 10px 25px rgba(25, 118, 210, 0.3);
}

.site-footer {
    background: var(--background-color);
    padding: var(--spacing-lg) 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.site-footer p {
    color: var(--text-muted);
    margin: 0;
}

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

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

@media (max-width: 768px) {
    :root {
        --spacing-xxl: 2rem;
        --spacing-xl: 1.5rem;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-lg);
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.3rem;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .skills-category {
        min-width: auto;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .company-info {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .project-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .contact-info {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    h2 {
        font-size: 1.8rem;
    }
    
    .headshot-placeholder {
        width: 150px;
        height: 150px;
    }
    
    .skills-pills {
        justify-content: flex-start;
    }
    
    .project-metrics {
        grid-template-columns: 1fr;
    }
}

@media (min-width: 1200px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
    
    .hero-title {
        font-size: 3.5rem;
    }
    
    .projects-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (prefers-contrast: high) {
    :root {
        --background-color: #000000;
        --surface-color: #1a1a1a;
        --text-primary: #ffffff;
        --text-secondary: #e0e0e0;
        --accent-color: #4fc3f7;
    }
}

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