:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #141414;
    --bg-tertiary: #1e1e1e;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --text-muted: #707070;
    --accent: #00ff88;
    --accent-hover: #00cc6a;
    --accent-glow: rgba(0, 255, 136, 0.3);
    --border: #2a2a2a;
    --shadow: rgba(0, 0, 0, 0.5);
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --transition: all 0.3s ease;
    --container-width: 1200px;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 4rem;
}

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

html {
    scroll-behavior: smooth;
}

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

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

.section-title {
    font-size: 2rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    position: relative;
}

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

.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
    box-shadow: 0 0 20px var(--accent-glow);
    transform: translateY(-2px);
}

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

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

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    border-radius: 6px;
    text-decoration: none;
    transition: var(--transition);
}

.btn-sm:first-child {
    background: var(--accent);
    color: var(--bg-primary);
}

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

.btn-sm:hover {
    transform: translateY(-2px);
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 10, 10, 0.9);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--border);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

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

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

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

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

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

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

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.menu-toggle span {
    width: 25px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl) 0;
    position: relative;
    background: radial-gradient(ellipse at 50% 50%, rgba(0, 255, 136, 0.05) 0%, transparent 50%);
}

.hero-content {
    text-align: center;
    max-width: 800px;
}

.hero-name {
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-title {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: var(--spacing-lg);
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto var(--spacing-lg);
    line-height: 1.8;
}

.hero-contact-info {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-xl);
    color: var(--text-secondary);
    font-size: 0.95rem;
}

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

.hero-scroll {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    color: var(--text-muted);
    animation: bounce 2s infinite;
    font-size: 1.5rem;
}

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

.projects {
    padding: var(--spacing-xl) 0;
}

.experience {
    padding: var(--spacing-xl) 0;
    background: var(--bg-secondary);
}

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

.experience-card {
    background: var(--bg-tertiary);
    padding: var(--spacing-lg);
    border-radius: 12px;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.experience-card:hover {
    border-color: var(--accent);
    transform: translateY(-5px);
}

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

.experience-header h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.experience-company {
    color: var(--accent);
    font-size: 0.9rem;
    font-weight: 500;
}

.experience-description {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-sm);
}

.experience-reference {
    color: var(--text-muted);
    font-size: 0.8rem;
    font-style: italic;
}

.education {
    padding: var(--spacing-xl) 0;
}

.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.education-card {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: 12px;
    border: 1px solid var(--border);
    transition: var(--transition);
    text-align: center;
}

.education-card:hover {
    border-color: var(--accent);
    transform: translateY(-5px);
}

.education-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.education-card h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.education-institution {
    color: var(--accent);
    font-weight: 500;
    font-size: 0.9rem;
    display: block;
    margin-bottom: var(--spacing-sm);
}

.education-status {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: var(--spacing-sm);
}

.education-details {
    color: var(--text-muted);
    font-size: 0.85rem;
    line-height: 1.5;
}

.certifications {
    padding: var(--spacing-xl) 0;
    background: var(--bg-secondary);
}

.certifications-grid {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.certification-card {
    background: var(--bg-tertiary);
    padding: var(--spacing-lg) var(--spacing-xl);
    border-radius: 12px;
    border: 1px solid var(--border);
    text-align: center;
    transition: var(--transition);
    min-width: 200px;
}

.certification-card:hover {
    border-color: var(--accent);
    transform: translateY(-5px);
}

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

.certification-card h3 {
    font-size: 1rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.certification-issuer {
    color: var(--accent);
    font-size: 0.85rem;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.project-card {
    background: var(--bg-secondary);
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px var(--shadow);
    border-color: var(--accent);
}

.project-image {
    height: 200px;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.project-placeholder {
    font-size: 4rem;
    opacity: 0.5;
}

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

.project-content h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.project-content p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
}

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

.project-tags span {
    background: var(--bg-tertiary);
    color: var(--accent);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
}

.project-links {
    display: flex;
    gap: var(--spacing-sm);
}

.contact {
    padding: var(--spacing-xl) 0;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

.contact-info p {
    color: var(--text-muted);
    margin-bottom: var(--spacing-lg);
    font-size: 1.1rem;
}

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

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--text-secondary);
    text-decoration: none;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.contact-item:hover {
    border-color: var(--accent);
    color: var(--text-primary);
}

.contact-icon {
    font-size: 1.25rem;
}

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: var(--font-main);
    font-size: 1rem;
    transition: var(--transition);
}

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

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

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

.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        flex-direction: column;
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        border-bottom: 1px solid var(--border);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }

    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

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

    .hero-description {
        font-size: 1rem;
    }

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

    .btn {
        width: 100%;
        max-width: 280px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .section-title {
        font-size: 1.5rem;
    }

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