* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    line-height: 1.6;
    background: #f4f7fb;
    color: #1f2937;
}

header {
    background: #2563eb;
    color: white;
    text-align: center;
    padding: 30px 20px;
}

header h1 {
    margin-bottom: 5px;
}

nav a {
    color: white;
    margin: 0 10px;
    text-decoration: none;
    font-weight: bold;
}

nav a:hover {
    text-decoration: underline;
}

main {
    width: min(100% - 40px, 900px);
    margin: 30px auto;
}

section {
    background: white;
    padding: 25px;
    margin-bottom: 25px;
    border-radius: 12px;
    box-shadow: 0 3px 12px rgba(0, 0, 0, 0.08);
}

img {
    display: block;
    max-width: 100%;
    height: auto;
    margin: 20px auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    border: 1px solid #cbd5e1;
    padding: 10px;
    text-align: left;
}

th {
    background: #dbeafe;
}

form {
    display: grid;
    gap: 10px;
}

input, textarea, button {
    font: inherit;
    padding: 10px;
}

button {
    background: #2563eb;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}

button:hover {
    background: #1d4ed8;
}

footer {
    text-align: center;
    padding: 20px;
    background: #111827;
    color: white;
}