/* Base colors*/
:root {
    --primary-color: #4a5568;
    --accent-color: #3182ce;
    --text-color: #2d3748;
    --light-bg: #f7fafc;
    --dark-bg: #edf2f7;
    --font-stack: system-ui, -apple-system, sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

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

/* Navbar */
header {
    background: #ffffff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1100px;
    margin: 0 auto;
    padding: 1rem 2rem;
    margin: 0 auto;
    padding: 1rem 2rem;
}

.logo {
    font-weight: 700;
    font-size: 1.25rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.2s;
}

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

/* Sections */
.site-section {
    padding: 5rem 2rem;
    display: flex;
    justify-content: center;
}

.section-content {
    max-width: 800px;
    width: 100%;
}

.alternate-bg {
    background-color: var(--dark-bg);
}

h1, h2 {
    margin-bottom: 1.5rem;
    color: #1a202c;
}

p {
    margin-bottom: 1.25rem;
}

/* Components */
.btn {
    display: inline-block;
    background-color: var(--accent-color);
    color: white;
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 600;
    margin-top: 1rem;
}

.project-grid {
    margin-top: 2rem;
}

.project-card {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.contact-links {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.contact-item {
    text-decoration: none;
    color: var(--accent-color);
    font-weight: 600;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    background-color: #1a202c;
    color: #a0aec0;
    font-size: 0.875rem;
}

/* Certificates */
.cert-grid {
    margin-top: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.cert-card {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
    border-left: 4px solid var(--accent-color);
}

.cert-badge-icon {
    font-size: 2.5rem;
    line-height: 1;
    background-color: var(--dark-bg);
    padding: 0.75rem;
    border-radius: 8px;
}

.cert-info h3 {
    margin-bottom: 0.25rem;
}

.cert-issuer {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.75rem;
}

.cert-desc {
    margin-bottom: 0rem;
    font-size: 0.95rem;
}

.cert-link {
    text-decoration: none;
    color: #1a202c;
    transition: color 0.2s ease;
}

.cert-link:hover {
    color: var(--accent-color); 
    text-decoration: underline; 
}

/* Mobile */
@media (max-width: 600px) {
    .cert-card {
        flex-direction: column;
        gap: 1rem;
    }
}