/* CSS Variables */
:root {
    --primary-color: #0066cc;
    --secondary-color: #005bb5;
    --text-color: #333;
    --text-light: #666;
    --background: #ffffff;
    --background-alt: #f8f9fa;
    --border-color: #e0e0e0;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.15);
    --max-width: 1200px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background);
}

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

/* Header and Navigation */
header {
    background-color: var(--background);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s ease;
}

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

/* Hero Section */
#hero {
    background: linear-gradient(135deg, #0066cc 0%, #005bb5 100%);
    color: white;
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    opacity: 0.95;
}

.hero-description {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
}

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

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.btn-primary {
    background-color: white;
    color: var(--primary-color);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.btn-secondary {
    background-color: transparent;
    color: white;
    border-color: white;
}

.btn-secondary:hover {
    background-color: white;
    color: var(--primary-color);
}

/* Section Styles */
section {
    padding: var(--spacing-xl) 0;
}

section:nth-child(even) {
    background-color: var(--background-alt);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    text-align: center;
    color: var(--primary-color);
}

/* About Section */
.about-text {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

/* Experience Section */
.experience-item {
    background-color: var(--background);
    border-radius: 8px;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

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

.company-header h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.duration {
    color: var(--text-light);
    font-size: 0.9rem;
    font-weight: 500;
}

.experience-item h4 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-color);
}

.location {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
}

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

.achievements {
    list-style-position: inside;
    margin-bottom: var(--spacing-sm);
}

.achievements li {
    margin-bottom: var(--spacing-xs);
    line-height: 1.7;
}

.tech-stack {
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--border-color);
    color: var(--text-light);
    font-size: 0.95rem;
}

/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.skill-category {
    background-color: var(--background);
    padding: var(--spacing-md);
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.skill-category h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    font-size: 1.2rem;
}

.skill-category ul {
    list-style: none;
}

.skill-category li {
    padding: var(--spacing-xs) 0;
    border-bottom: 1px solid var(--border-color);
}

.skill-category li:last-child {
    border-bottom: none;
}

/* Contact Section */
.contact-text {
    text-align: center;
    font-size: 1.1rem;
    margin-bottom: var(--spacing-lg);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 4px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.contact-link:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

/* Footer */
footer {
    background-color: var(--text-color);
    color: white;
    text-align: center;
    padding: var(--spacing-md) 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: var(--spacing-sm);
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .company-header {
        flex-direction: column;
        align-items: flex-start;
    }

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

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.5rem;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }

    .experience-item {
        padding: var(--spacing-sm);
    }
}