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

body {
    font-family: Arial, sans-serif;
    background: linear-gradient(135deg, #000000 0%, #0a0a1a 50%, #000814 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #ffffff;
}

.container {
    text-align: center;
    padding: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
}

.code-row {
    display: flex;
    justify-content: center;
    width: 100%;
    margin-bottom: 32px;
}

.code-input-box {
    background-color: #1a1a2e;
    border: 3px solid #2d3561;
    border-radius: 10px;
    padding: 30px 40px;
    display: flex;
    gap: 12px;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(0, 123, 255, 0.15);
}

.code-digit {
    width: 55px;
    height: 65px;
    font-size: 2.2rem;
    text-align: center;
    background-color: #ffffff;
    border: 2px solid #cccccc;
    border-radius: 6px;
    color: #000000;
    font-family: Arial, sans-serif;
    font-weight: bold;
    transition: all 0.2s ease;
    outline: none;
}

.code-digit:focus {
    border-color: #4a90e2;
    box-shadow: 0 0 8px rgba(74, 144, 226, 0.4);
}

.error-message {
    margin-top: 20px;
    font-size: 1rem;
    color: #ef4444;
    min-height: 25px;
    letter-spacing: 0.5px;
}

@media (max-width: 600px) {
    .code-row {
        margin-bottom: 20px;
    }
    .code-digit {
        width: 45px;
        height: 55px;
        font-size: 1.8rem;
    }
    .code-input-box {
        padding: 20px 25px;
        gap: 8px;
    }
}