* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
}

/* Header */
header {
    background: linear-gradient(135deg, #1f2d3d, #2c3e50);
    color: white;
    padding: 50px 20px;
    text-align: center;
}

header h1 {
    margin: 0;
    font-size: 2.4rem;
}

header p {
    margin-top: 10px;
    font-size: 1.1rem;
    color: #dfe6e9;
}

/* Navigation */
nav {
    position: sticky;
    top: 0;
    z-index: 100;
    text-align: center;
    background: #34495e;
    padding: 12px 10px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

nav a {
    color: white;
    margin: 0 14px;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

nav a:hover {
    color: #74b9ff;
}

/* Sections */
section {
    padding: 30px;
    max-width: 950px;
    margin: 25px auto;
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
}

h2 {
    color: #2c3e50;
    margin-top: 0;
    border-bottom: 2px solid #2980b9;
    display: inline-block;
    padding-bottom: 5px;
}

/* Skills and Projects */
.skills,
.projects {
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
    margin-top: 20px;
}

.skill,
.project {
    background: #ecf0f1;
    padding: 18px;
    border-radius: 10px;
    flex: 1 1 220px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.skill:hover,
.project:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.12);
}

/* Button */
a.button {
    display: inline-block;
    margin-top: 12px;
    background: #2980b9;
    color: white;
    padding: 10px 18px;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 500;
    transition: background 0.3s ease, transform 0.3s ease;
}

a.button:hover {
    background: #3498db;
    transform: translateY(-2px);
}

/* Footer */
footer {
    background: #2c3e50;
    color: white;
    text-align: center;
    padding: 18px 10px;
    margin-top: 40px;
}

/* Mobile Responsive */
@media (max-width: 600px) {
    header {
        padding: 35px 15px;
    }

    header h1 {
        font-size: 2rem;
    }

    nav a {
        display: inline-block;
        margin: 8px 10px;
    }

    section {
        margin: 18px 12px;
        padding: 22px;
    }

    .skill,
    .project {
        flex: 1 1 100%;
    }
}