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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    background: #2d2d44;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
    max-width: 400px;
    width: 100%;
}

h1 {
    color: #e0e0e0;
    margin-bottom: 30px;
    text-align: center;
}

label {
    color: #b0b0b0;
    font-size: 14px;
}

input {
    width: 100%;
    padding: 12px;
    margin: 10px 0;
    border: 2px solid #4a4a5e;
    background: #3a3a4e;
    color: #e0e0e0;
    border-radius: 8px;
    font-size: 16px;
}

input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

input:focus {
    outline: none;
    border-color: #667eea;
}

button {
    width: 100%;
    padding: 12px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    margin-top: 20px;
    transition: background 0.3s;
}

button:hover {
    background: #7b8df8;
}

.result {
    margin-top: 20px;
    padding: 20px;
    background: #3a3a4e;
    border: 2px solid #4a4a5e;
    border-radius: 8px;
    text-align: center;
    color: #e0e0e0;
    font-size: 18px;
    font-weight: bold;
}