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

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    background: #f4f4f4;
    color: #333;
    transition: background 0.3s, color 0.3s;
}

header {
    background: #2563eb;
    color: white;
    text-align: center;
    padding: 3rem 1rem;
}

header h1 {
    font-size: 3rem;
}

header p {
    margin-top: 0.5rem;
}

button {
    margin-top: 1rem;
    padding: 0.7rem 1rem;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}

section {
    max-width: 900px;
    margin: auto;
    padding: 2rem;
}

.projects {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.project-card {
    background: white;
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

footer {
    text-align: center;
    padding: 1.5rem;
    background: #222;
    color: white;
}

.dark-mode {
    background: #121212;
    color: white;
}

.dark-mode .project-card {
    background: #1f1f1f;
}

.dark-mode footer {
    background: #000;
}
.certifications {
    max-width: 900px;
    margin: auto;
    padding: 2rem;
}

.cert-card {
    background: white;
    padding: 1.5rem;
    margin-bottom: 1rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.cert-card h3 {
    margin-bottom: 0.5rem;
}
.dark-mode .cert-card {
    background: #1f1f1f;
}