/* RESET */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Segoe UI", sans-serif;
}

/* BACKGROUND */
body {
    background: linear-gradient(135deg, #667eea, #764ba2);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* CONTAINER */
.container {
    width: 850px;
    background: #ffffff;
    border-radius: 14px;
    padding: 25px 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.25);
}

/* TITLE */
h2 {
    text-align: center;
    color: #333;
    margin-bottom: 20px;
    letter-spacing: 1px;
}

/* BOX SECTION */
.box, .output {
    background: #f7f9fc;
    padding: 18px;
    border-radius: 12px;
    margin-bottom: 20px;
    border-left: 6px solid #667eea;
}

/* FORM ELEMENT */
label {
    display: block;
    margin-top: 10px;
    font-weight: 600;
    color: #444;
}

input {
    width: 100%;
    padding: 10px;
    margin-top: 6px;
    border-radius: 6px;
    border: 1px solid #ccc;
    transition: 0.2s;
}

input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 5px rgba(102, 126, 234, 0.5);
}

/* BUTTONS */
.btn-group {
    margin-top: 15px;
}

button {
    padding: 10px 18px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: bold;
    margin-right: 10px;
    transition: 0.3s;
}

button:first-child {
    background: #667eea;
    color: white;
}

button:first-child:hover {
    background: #5563d8;
}

button:last-child {
    background: #e74c3c;
    color: white;
}

button:last-child:hover {
    background: #c0392b;
}

/* OUTPUT */
.output p {
    margin: 6px 0;
    font-size: 16px;
}

.output span {
    font-weight: bold;
    color: #2c3e50;
}

/* FOOTER */
.footer {
    margin-top: 15px;
    text-align: center;
    font-size: 14px;
    color: #555;
}