/* Apple-style soft color palette and layout */

body {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
    background: linear-gradient(to right, #e8edf3, #f8fbfd);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

#app {
    background: #ffffffcc;
    backdrop-filter: blur(10px);
    padding: 35px 45px;
    border-radius: 20px;
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
    text-align: center;
    max-width: 420px;
    width: 90%;
    transition: all 0.3s ease-in-out;
}

h1 {
    color: #2c3e50;
    margin-bottom: 25px;
    font-size: 1.8rem;
    font-weight: 600;
}

label {
    display: block;
    font-size: 1rem;
    margin-bottom: 6px;
    text-align: left;
    color: #333;
    font-weight: 500;
}

select,
input {
    width: 100%;
    padding: 12px 14px;
    margin: 10px 0 20px 0;
    font-size: 1rem;
    border: 1px solid #d0d7de;
    border-radius: 10px;
    background-color: #f9fafa;
    color: #333;
    transition: border-color 0.2s ease-in-out;
}

select:focus,
input:focus {
    outline: none;
    border-color: #007aff;
    background-color: #ffffff;
}

button {
    padding: 12px 22px;
    margin: 5px;
    background-color: #007aff;
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: #005fc1;
}

button.clear-btn {
    background-color: #e63946;
}

button.clear-btn:hover {
    background-color: #c82333;
}

#result {
    margin-top: 20px;
    font-size: 1.2rem;
    font-weight: bold;
    color: #1a1a1a;
    min-height: 30px;
}
.footer {
    position: fixed;
    bottom: 10px;
    right: 15px;
    font-size: 20px;
    color: #000000; /* Black color */
    opacity: 1.0;    /* Still subtle */
    font-family: monospace;
    user-select: none;
}