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

body {
    background-color: #0a0a0a;
    color: #00ff9d;
    font-family: 'Courier Prime', monospace;
    min-height: 100vh;
    padding: 40px 20px;
    text-align: center;
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

h1 {
    font-family: 'Nosifer', cursive;
    font-size: 3.5rem;
    text-shadow: 0 0 20px #00ff9d,
                 0 0 40px #00ff9d;
    margin-bottom: 10px;
    letter-spacing: 4px;
}

.subtitle {
    font-size: 1.4rem;
    opacity: 0.8;
    margin-bottom: 40px;
}

.debt-box {
    background-color: #112211;
    border: 4px solid #00ff9d;
    padding: 25px;
    margin: 30px auto;
    max-width: 700px;
    border-radius: 12px;
    box-shadow: 0 0 40px rgba(0, 255, 157, 0.8),
                inset 0 0 30px rgba(0, 255, 157, 0.3);
    text-align: center;
}

#outputText {
    font-size: 1.8rem;
    font-weight: bold;
    color: #ff000d;
    text-shadow: 0 0 15px #00ff9d;
}

.neon-button {
    padding: 18px 50px;
    font-size: 1.6rem;
    font-family: 'Courier Prime', monospace;
    background: transparent;
    color: #ff3366;
    border: 4px solid #ff3366;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 3px;
    box-shadow: 0 0 30px rgba(255, 51, 102, 0.7);
    transition: all 0.4s ease;
}

.neon-button:hover {
    background: #ff3366;
    color: #0a0a0a;
    box-shadow: 0 0 50px rgba(255, 51, 102, 1);
    transform: scale(1.05);
}

.neon-button.small {
    padding: 12px 30px;
    font-size: 1.1rem;
}

.card-display {
    margin: 50px auto;
    padding: 40px;
    border: 5px solid #00ff9d;
    border-radius: 15px;
    background-color: #111;
    box-shadow: 0 0 60px rgba(0, 255, 157, 0.5);
    min-height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#cardResult {
    font-size: 4.5rem;
    font-weight: bold;
    letter-spacing: 8px;
    text-shadow: 0 0 30px currentColor;
}

.separator {
    height: 3px;
    background: linear-gradient(to right, transparent, #00ff9d, transparent);
    margin: 60px 0;
}

h2 {
    margin: 30px 0 15px;
    font-size: 1.8rem;
}

input {
    padding: 14px;
    font-size: 1.2rem;
    width: 320px;
    background: #1a1a1a;
    border: 3px solid #00ff9d;
    color: #00ff9d;
    margin: 10px 0;
}

#result {
    margin-top: 20px;
    font-size: 1.3rem;
    cursor: pointer;
    padding: 15px;
    border: 2px dashed #00ff9d;
    display: inline-block;
}