body {
    font-family: 'Inter', sans-serif;
    margin: 0;
    padding: 0;
    background: #f7f9f9;
    color: #0f1419;
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    align-items: center;
}

header {
    width: 100%;
    background: #1d9bf0;
    color: #fff;
    padding: 20px 0;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

header h1 {
    font-size: 1.8em;
    font-weight: 600;
}

header nav {
    margin-top: 10px;
}

header nav a {
    color: #fff;
    text-decoration: none;
    margin: 0 10px;
    font-weight: 600;
    transition: color 0.3s ease;
}

header nav a:hover {
    color: #cce7ff;
}

main {
    max-width: 800px;
    width: 90%;
    margin: 30px auto;
    padding: 20px;
    background: #fff;
    border: 1px solid #e1e8ed;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

h2 {
    font-size: 1.5em;
    color: #1d9bf0;
    margin-bottom: 15px;
}

label {
    font-size: 0.9em;
    font-weight: 600;
    margin-bottom: 8px;
    color: #536471;
    display: block;
}

input {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid #e1e8ed;
    border-radius: 8px;
    font-size: 1em;
    color: #0f1419;
    background: #f7f9f9;
    transition: border-color 0.2s ease;
}

input:focus {
    border-color: #1d9bf0;
    outline: none;
}

button {
    width: 100%;
    padding: 12px;
    background: #1d9bf0;
    color: #fff;
    font-size: 1em;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s ease, transform 0.2s ease;
}

button:hover {
    background: #1a8cd8;
    transform: translateY(-2px);
}

.result {
    margin-top: 20px;
    padding: 15px;
    background: #f7f9f9;
    border-radius: 8px;
    border: 1px solid #e1e8ed;
    font-size: 0.9em;
    color: #0f1419;
}

.result strong {
    display: block;
    margin-bottom: 8px;
}

ul {
    margin: 15px 0;
    padding-left: 20px;
}

ul li {
    margin-bottom: 10px;
}

.highlight {
    background: #f0f9ff;
    padding: 10px;
    border-left: 4px solid #1d9bf0;
    margin: 15px 0;
    border-radius: 8px;
}

footer {
    text-align: center;
    margin-top: 30px;
    padding: 20px;
    font-size: 0.9em;
    color: #536471;
}

footer a {
    color: #1d9bf0;
    text-decoration: none;
    font-weight: 600;
}

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