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

body {
    font-family: 'Inter', sans-serif;
    background-color: #0a0a0a;
    color: #ffffff;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navigation */
nav {
    padding: 1.5rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    background: rgba(10, 10, 10, 0.9);
    backdrop-filter: blur(10px);
    z-index: 1000;
}

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

.logo {
    font-weight: 700;
    font-size: 1.5rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-decoration: none;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

nav a {
    color: #a0a0a0;
    text-decoration: none;
    transition: color 0.3s;
}

nav a:hover,
nav a.active {
    color: #ffffff;
}

/* Hero Section */
.hero {
    margin-top: 80px;
    padding: 6rem 0;
    min-height: 90vh;
    display: flex;
    align-items: center;
}

.hero h1 {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.highlight {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    font-size: 1.5rem;
    color: #667eea;
    margin-bottom: 1rem;
}

.description {
    font-size: 1.25rem;
    color: #a0a0a0;
    max-width: 600px;
    margin-bottom: 2rem;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
}

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.2s, box-shadow 0.2s;
    display: inline-block;
}

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

.btn.primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn.secondary {
    border: 2px solid #667eea;
    color: #667eea;
}

.btn.secondary:hover {
    background: #667eea;
    color: white;
}

/* Page Header */
.page-header {
    margin-top: 80px;
    padding: 4rem 0 2rem;
    text-align: center;
    border-bottom: 1px solid #333;
}

.page-header h1 {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.page-header p {
    color: #a0a0a0;
    font-size: 1.1rem;
}

/* Sections */
section {
    padding: 4rem 0;
}

h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    text-align: center;
}

/* About */
.about p {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 2rem;
    color: #a0a0a0;
}

.skills {
    margin-top: 3rem;
    text-align: center;
}

.skills h3 {
    margin-bottom: 1rem;
    color: #667eea;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
}

.tag {
    background: rgba(102, 126, 234, 0.1);
    color: #667eea;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    border: 1px solid rgba(102, 126, 234, 0.3);
}

/* Projects */
.projects {
    background: #111111;
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.project-card {
    background: #1a1a1a;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid #333;
    transition: transform 0.3s, border-color 0.3s;
}

.project-card:hover {
    transform: translateY(-5px);
    border-color: #667eea;
}

.project-content {
    padding: 1.5rem;
}

.project-content h3 {
    margin-bottom: 0.5rem;
    color: #ffffff;
}

.project-content p {
    color: #a0a0a0;
    margin-bottom: 1rem;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.project-tags span {
    font-size: 0.75rem;
    background: rgba(102, 126, 234, 0.1);
    color: #667eea;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
}

.project-links {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.btn.small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

/* Certificates */
.certificate-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.certificate-card {
    background: #1a1a1a;
    border-radius: 12px;
    border: 1px solid #333;
    padding: 1.5rem;
    transition: transform 0.3s, border-color 0.3s;
}

.certificate-card:hover {
    transform: translateY(-5px);
    border-color: #667eea;
}

.certificate-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
    color: #ffffff;
}

.cert-date {
    color: #667eea;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.cert-images {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.cert-images img {
    width: 100%;
    border-radius: 8px;
    border: 1px solid #333;
    transition: transform 0.2s;
}

.cert-images img:hover {
    transform: scale(1.02);
}

/* Contact */
.contact {
    text-align: center;
}

.contact p {
    color: #a0a0a0;
    margin-bottom: 2rem;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem 0;
    color: #666;
    border-top: 1px solid #333;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1,
    .page-header h1 {
        font-size: 2.5rem;
    }

    nav ul {
        display: none;
    }

    .cta-buttons,
    .contact-links {
        flex-direction: column;
    }

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

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

    .cert-images {
        grid-template-columns: 1fr;
    }
}