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

:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #171717;
    --bg-hover: #262626;
    --border: #333333;
    --text-primary: #fafafa;
    --text-secondary: #a1a1a1;
    --accent: #fafafa;
    --error: #ef4444;
}

body {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', 'Courier New', monospace;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.container {
    width: 100%;
    max-width: 500px;
}

.card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 2rem;
}

h1 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    letter-spacing: -0.025em;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 2rem;
}

.output-section {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.password-output {
    flex: 1;
    background-color: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.875rem;
    outline: none;
    transition: border-color 0.2s;
}

.password-output:focus {
    border-color: var(--accent);
}

.password-output::placeholder {
    color: var(--text-secondary);
}

.btn {
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all 0.2s;
    outline: none;
}

.btn-primary {
    width: 100%;
    background-color: var(--accent);
    color: var(--bg-primary);
    border-color: var(--accent);
}

.btn-primary:hover {
    background-color: var(--text-secondary);
    border-color: var(--text-secondary);
}

.btn-primary:active {
    transform: scale(0.98);
}

.btn-secondary {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--bg-hover);
    border-color: var(--text-secondary);
}

.btn-secondary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.options-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.option-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.slider {
    width: 100%;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    outline: none;
    -webkit-appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
}

.slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

.checkboxes {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.875rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 4px;
    transition: background-color 0.2s;
}

.checkbox-label:hover {
    background-color: var(--bg-hover);
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--accent);
}

.error-message {
    color: var(--error);
    font-size: 0.875rem;
    min-height: 1.25rem;
}

@media (max-width: 640px) {
    body {
        padding: 1rem;
    }

    .card {
        padding: 1.5rem;
    }

    h1 {
        font-size: 1.5rem;
    }
}