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

body {
    background: #f4f6f8;
    color: #333;
}

/* HEADER */
.header {
    background: linear-gradient(135deg, #0a3cff, #001f7a);
    color: #fff;
    text-align: center;
    padding: 30px 15px;
}

.header h1 {
    font-size: 28px;
}

.header p {
    margin-top: 8px;
    opacity: 0.9;
}

/* MAIN */
.converter-container {
    max-width: 600px;
    margin: 40px auto;
    padding: 20px;
}

/* SECTIONS */
section {
    background: #fff;
    border-radius: 10px;
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

section h2 {
    margin-bottom: 20px;
    color: #0a3cff;
}

/* FORM GROUPS */
.convert-box {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

label {
    font-weight: 600;
}

select,
input {
    padding: 12px;
    border-radius: 6px;
    border: 1px solid #ccc;
    font-size: 15px;
}

input:focus,
select:focus {
    outline: none;
    border-color: #0a3cff;
}

/* BUTTON */
button {
    margin-top: 15px;
    padding: 14px;
    background: #0a3cff;
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.3s ease;
}

button:hover {
    background: #001f7a;
}

/* RESULT */
.result-box {
    margin-top: 20px;
    padding: 15px;
    background: #eef2ff;
    border-radius: 8px;
    text-align: center;
}

.result-box h3 {
    font-size: 26px;
    color: #0a3cff;
    margin: 10px 0;
}

/* FOOTER */
.footer {
    background: #001f7a;
    color: #fff;
    text-align: center;
    padding: 25px 15px;
}

.footer p {
    margin: 6px 0;
    font-size: 14px;
}

.footer a {
    color: #a8c4ff;
    text-decoration: none;
}

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