@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', Arial, sans-serif;
    background-color: #f0e8dc;
    color: #3a1c1c;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-image:
        radial-gradient(circle at 30% 40%, rgba(160, 60, 40, 0.04) 0%, transparent 50%),
        radial-gradient(circle at 70% 60%, rgba(160, 60, 40, 0.04) 0%, transparent 50%);
}

.container {
    background: linear-gradient(160deg, #c0392b 0%, #a83229 40%, #8e2a22 100%);
    padding: 32px 30px;
    border-radius: 18px;
    box-shadow:
        0 20px 50px rgba(0, 0, 0, 0.35),
        0 8px 20px rgba(0, 0, 0, 0.2),
        0 3px 0 #6e1d18,
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    width: 400px;
}

h1 {
    text-align: center;
    color: #fde8db;
    font-weight: 800;
    font-size: 22px;
    letter-spacing: 1.5px;
    margin-bottom: 24px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

form {
    display: flex;
    flex-direction: column;
}

label {
    margin-bottom: 6px;
    font-weight: 600;
    font-size: 13px;
    color: #fde8db;
    letter-spacing: 0.8px;
    text-transform: uppercase;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.25);
}

input[type="number"] {
    padding: 12px 14px;
    border-radius: 10px;
    border: 2px solid rgba(0, 0, 0, 0.08);
    margin-bottom: 16px;
    font-family: 'Inter', sans-serif;
    font-size: 16px;
    font-weight: 500;
    color: #3a1c1c;
    background: linear-gradient(180deg, #fdf6ee, #f2e0cc);
    box-shadow:
        inset 0 2px 4px rgba(0, 0, 0, 0.08),
        0 2px 4px rgba(0, 0, 0, 0.12);
    outline: none;
    transition: box-shadow 0.2s ease, border-color 0.2s ease;
    -moz-appearance: textfield;
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

input[type="number"]:focus {
    border-color: rgba(255, 220, 200, 0.5);
    box-shadow:
        inset 0 2px 4px rgba(0, 0, 0, 0.08),
        0 0 0 3px rgba(253, 232, 219, 0.25);
}

input[type="button"] {
    padding: 14px;
    border-radius: 10px;
    border: none;
    font-family: 'Inter', sans-serif;
    font-size: 16px;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: #3a1c1c;
    background: linear-gradient(180deg, #fdf6ee, #ecd4bc);
    cursor: pointer;
    box-shadow:
        0 4px 0 #c4a08a,
        0 6px 12px rgba(0, 0, 0, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.8);
    transition: all 0.08s ease;
}

input[type="button"]:hover {
    background: linear-gradient(180deg, #fff9f2, #f2dcc8);
    box-shadow:
        0 5px 0 #c4a08a,
        0 8px 14px rgba(0, 0, 0, 0.25),
        inset 0 1px 0 rgba(255, 255, 255, 0.9);
    transform: translateY(-1px);
}

input[type="button"]:active {
    background: linear-gradient(180deg, #e8cdb8, #dcc0a8);
    box-shadow:
        0 1px 0 #c4a08a,
        0 2px 4px rgba(0, 0, 0, 0.15),
        inset 0 2px 3px rgba(0, 0, 0, 0.08);
    transform: translateY(3px);
}

.result {
    margin-top: 20px;
    padding: 14px 16px;
    background: linear-gradient(180deg, #fdf6ee, #f2e0cc);
    border-radius: 10px;
    border: 2px solid rgba(0, 0, 0, 0.08);
    box-shadow:
        inset 0 2px 4px rgba(0, 0, 0, 0.06),
        0 2px 4px rgba(0, 0, 0, 0.1);
    min-height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #3a1c1c;
}

.result span {
    font-family: 'Inter', sans-serif;
    font-size: 18px;
    font-weight: 700;
    color: #3a1c1c;
    letter-spacing: 0.5px;
}