* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
    scroll-behavior: smooth;
}

body {
    background-color: #f4f6f9;
    color: #333333;
    line-height: 1.6;
}

header {
    background-color: #ffffff;
    padding: 20px 6%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.logo {
    color: #2563eb;
    font-size: 25px;
}

nav {
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
}

nav a {
    text-decoration: none;
    color: #333333;
    font-size: 14px;
    font-weight: bold;
    transition: color 0.3s;
}

nav a:hover {
    color: #2563eb;
}

#home {
    background: linear-gradient(135deg, #dbeafe, #eff6ff);
    text-align: center;
    padding: 110px 20px;
}

#home h1 {
    font-size: 42px;
    margin-bottom: 10px;
}

#home h1 span {
    color: #2563eb;
}

#home h3 {
    color: #1d4ed8;
    font-size: 21px;
    margin-bottom: 20px;
}

#home p {
    max-width: 600px;
    margin: 0 auto 30px;
}

.button {
    display: inline-block;
    background-color: #2563eb;
    color: white;
    padding: 13px 25px;
    text-decoration: none;
    border-radius: 6px;
    font-weight: bold;
    transition: background-color 0.3s, transform 0.3s;
}

.button:hover {
    background-color: #1d4ed8;
    transform: translateY(-3px);
}

section:not(#home) {
    padding: 65px 20px;
    text-align: center;
    scroll-margin-top: 90px;
}

section h2 {
    color: #2563eb;
    font-size: 30px;
    margin-bottom: 25px;
}

section p {
    line-height: 1.8;
}

.skills-container {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 18px;
    max-width: 800px;
    margin: auto;
}

.skill {
    background-color: white;
    border: 1px solid #2563eb;
    color: #2563eb;
    padding: 15px 30px;
    border-radius: 8px;
    font-weight: bold;
    transition: transform 0.3s, box-shadow 0.3s;
}

.skill:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(37, 99, 235, 0.15);
}

.projects-container {
    display: flex;
    justify-content: center;
    align-items: stretch;
    flex-wrap: wrap;
    gap: 25px;
    max-width: 1000px;
    margin: auto;
}

.project-card {
    background-color: white;
    width: 270px;
    padding: 25px;
    border: 1px solid #e5e7eb;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s, box-shadow 0.3s;
}

.project-card:hover {
    transform: translateY(-7px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.project-card h3 {
    color: #2563eb;
    margin-bottom: 12px;
}

#about,
#projects,
#contact {
    background-color: #ffffff;
}

#skills,
#certifications,
#experience {
    background-color: #f4f6f9;
}

footer {
    background-color: #1f2937;
    color: white;
    text-align: center;
    padding: 20px;
}

@media (max-width: 768px) {
    header {
        flex-direction: column;
        padding: 18px 12px;
    }

    nav {
        justify-content: center;
        gap: 12px;
    }

    nav a {
        font-size: 13px;
    }

    #home {
        padding: 80px 20px;
    }

    #home h1 {
        font-size: 32px;
    }

    #home h3 {
        font-size: 18px;
    }

    section:not(#home) {
        padding: 45px 15px;
    }

    section h2 {
        font-size: 26px;
    }

    .project-card {
        width: min(100%, 350px);
    }
}

@media (max-width: 400px) {
    #home h1 {
        font-size: 27px;
    }

    nav {
        gap: 10px;
    }
}