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

:root {
    --color-primary: #2c3e50;
    --color-secondary: #34495e;
    --color-accent: #3498db;
    --color-text: #333;
    --color-text-light: #666;
    --color-bg: #ffffff;
    --color-bg-alt: #f8f9fa;
    --color-border: #e1e4e8;
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Courier New', monospace;
    --max-width: 1200px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
}

body {
    font-family: var(--font-primary);
    color: var(--color-text);
    line-height: 1.6;
    background-color: var(--color-bg);
}

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

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    padding: var(--spacing-sm) 0;
}

.nav .container {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
}

.nav-link {
    color: var(--color-text);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 4px;
    transition: all 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-accent);
    background-color: rgba(52, 152, 219, 0.1);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-xl) 0;
    margin-top: 60px;
}

.hero-name {
    font-size: clamp(1.75rem, 4vw, 3rem);
    font-weight: 700;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-md);
}

.hero-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.5rem);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

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

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    text-decoration: none;
    font-weight: 500;
    border-radius: 6px;
    transition: all 0.3s ease;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background-color: var(--color-secondary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(44, 62, 80, 0.2);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
    background-color: var(--color-primary);
    color: white;
    transform: translateY(-2px);
}

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

.section-title {
    font-size: clamp(2rem, 3vw, 2.5rem);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
    text-align: center;
    letter-spacing: -0.01em;
}

/* About Section */
.about {
    background-color: var(--color-bg-alt);
}

.about-text {
    max-width: 700px;
    margin: 0 auto;
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--color-text);
    text-align: center;
}

/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.skill-category {
    background-color: var(--color-bg);
    padding: var(--spacing-md);
    border-radius: 8px;
    border: 1px solid var(--color-border);
    transition: all 0.3s ease;
}

.skill-category:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.skill-category h3 {
    font-size: 1.25rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

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

.skill-category li {
    padding: var(--spacing-xs) 0;
    color: var(--color-text-light);
    font-size: 0.95rem;
}

.skill-category li:before {
    content: "▹ ";
    color: var(--color-accent);
    font-weight: bold;
    margin-right: var(--spacing-xs);
}

/* Certifications Section */
.certifications {
    background-color: var(--color-bg-alt);
}

.certifications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.cert-card {
    background-color: var(--color-bg);
    padding: var(--spacing-md);
    border-radius: 8px;
    border: 1px solid var(--color-border);
    transition: all 0.3s ease;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: inherit;
}

.cert-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.cert-icon {
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    height: 120px;
}

.cert-logo {
    max-width: 100px;
    max-height: 100px;
    object-fit: contain;
}

.cert-title {
    font-size: 1.15rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    line-height: 1.4;
}

.cert-level {
    color: var(--color-text-light);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.cert-date {
    color: var(--color-text-light);
    font-size: 0.85rem;
    font-family: var(--font-mono);
}

/* Projects Section */
.projects {
    background-color: var(--color-bg-alt);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.project-card {
    background-color: var(--color-bg);
    padding: var(--spacing-md);
    border-radius: 8px;
    border: 1px solid var(--color-border);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.project-card.placeholder {
    opacity: 0.6;
    border-style: dashed;
}

.project-thumbnail {
    width: 100%;
    height: 200px;
    overflow: hidden;
    border-radius: 6px;
    margin-bottom: var(--spacing-md);
    background-color: var(--color-bg-alt);
}

.project-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

.project-title {
    font-size: 1.35rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.project-description {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    flex-grow: 1;
    line-height: 1.7;
}

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

.tag {
    background-color: rgba(52, 152, 219, 0.1);
    color: var(--color-accent);
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 500;
    font-family: var(--font-mono);
}

.project-link {
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s ease;
    display: inline-block;
}

.project-link:hover {
    transform: translateX(4px);
}

/* Contact Section */
.contact-text {
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--spacing-lg) auto;
    font-size: 1.1rem;
    color: var(--color-text-light);
}

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

.contact-link {
    padding: 0.875rem 2rem;
    background-color: var(--color-primary);
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.contact-link:hover {
    background-color: var(--color-secondary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(44, 62, 80, 0.2);
}

/* Footer */
.footer {
    background-color: var(--color-primary);
    color: white;
    text-align: center;
    padding: var(--spacing-md) 0;
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --spacing-md: 1.5rem;
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }

    .nav .container {
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }

    .nav-link {
        font-size: 0.9rem;
        padding: var(--spacing-xs);
    }

    .hero {
        min-height: 80vh;
    }

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

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 300px;
        text-align: center;
    }
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Selection Styling */
::selection {
    background-color: var(--color-accent);
    color: white;
}