* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;

    display: flex;
    align-items: center;
    justify-content: center;

    font-family: Arial, sans-serif;
    background: #f4f4f5;
    color: #18181b;
}

.container {
    width: min(90%, 600px);
    padding: 40px;

    background: white;
    border-radius: 16px;

    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

h1 {
    margin-top: 0;
    margin-bottom: 8px;
    text-align: center;
}

.subtitle {
    margin-top: 0;
    margin-bottom: 30px;
    text-align: center;
    color: #71717a;
}

.form {
    display: flex;
    gap: 10px;
}

input {
    width: 100%;
    padding: 14px;

    border: 1px solid #d4d4d8;
    border-radius: 8px;

    font-size: 16px;
}

button {
    padding: 14px 18px;

    border: none;
    border-radius: 8px;

    background: #18181b;
    color: white;

    font-size: 15px;
    cursor: pointer;
}

button:hover {
    opacity: 0.85;
}

.result {
    margin-top: 30px;
}

.shortlink-container {
    display: flex;
    gap: 10px;
}

.shortlink-container input {
    background: #f4f4f5;
}

#message {
    margin-top: 20px;
    text-align: center;
    color: #dc2626;
}

.hidden {
    display: none;
}

@media (max-width: 600px) {
    .container {
        padding: 25px;
    }

    .form {
        flex-direction: column;
    }

    .shortlink-container {
        flex-direction: column;
    }
}