:root {
    --bg-color: #09090b;
    --card-bg: #18181b;
    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --border-color: #27272a;
    --input-bg: #00000053;
    --accent-color: #3f3f46;
    --accent-hover: #52525b;
    --focus-ring: rgba(255, 255, 255, 0.15);
    --success-bg: #e4e4e7;
    --success-text: #000000;
}

body {
    font-family: system-ui, -apple-system, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--bg-color);
    margin: 0;
    padding: 1rem;
    color: var(--text-primary);
    box-sizing: border-box;
}

.container {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
    width: 100%;
    max-width: 500px;
    box-sizing: border-box;
}

h2 {
    margin-top: 0;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    text-align: center;
    font-size: 1.5rem;
    letter-spacing: -0.025em;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

textarea, input {
    width: 100%;
    padding: 0.85rem;
    background-color: var(--input-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-sizing: border-box;
    font-family: monospace;
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

textarea::placeholder, input::placeholder {
    color: #52525b;
}

textarea:focus, input:focus {
    outline: none;
    border-color: #52525b;
    box-shadow: 0 0 0 3px var(--focus-ring);
}

textarea {
    resize: vertical;
    min-height: 120px;
    margin-bottom: 1.5rem;
}

.output-group {
    display: flex;
    gap: 0.5rem;
}

.output-group input {
    background-color: #09090b;
}

button {
    background: var(--accent-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.2s;
    width: 100px; 
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
}

button:hover {
    background: var(--accent-hover);
}

button:active {
    transform: scale(0.96);
}

button.success {
    background: var(--success-bg);
    color: var(--success-text);
    border-color: var(--success-bg);
}

@media (max-width: 480px) {
    .container {
        padding: 1.5rem;
    }
    h2 {
        font-size: 1.25rem;
    }
    .output-group {
        flex-direction: column;
    }
    button {
        width: 100%;
    }
}