:root {
    --pgt-bg-card: #ffffff;
    --pgt-text-main: #2d3748;
    --pgt-text-muted: #718096;
    --pgt-border-color: #e2e8f0;
    --pgt-accent-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --pgt-accent-hover: linear-gradient(135deg, #5a6fd6 0%, #694293 100%);
    --pgt-secondary-btn: #edf2f7;
    --pgt-secondary-btn-hover: #e2e8f0;
    --pgt-input-inner-bg: #f7fafc;
    --pgt-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
    
    /* System Metric Color Profiles */
    --pgt-weak: #e53e3e;
    --pgt-medium: #dd6b20;
    --pgt-strong: #38a169;
    --pgt-very-strong: #243b23;
}

/* Dark-mode Adaptability Variables override */
@media (prefers-color-scheme: dark) {
    :root {
        --pgt-bg-card: #1a202c;
        --pgt-text-main: #f7fafc;
        --pgt-text-muted: #a0aec0;
        --pgt-border-color: #2d3748;
        --pgt-secondary-btn: #2d3748;
        --pgt-secondary-btn-hover: #4a5568;
        --pgt-input-inner-bg: #1a202c;
        --pgt-very-strong: #48bb78;
        --pgt-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.4);
    }
}

.pgt-container {
    max-width: 650px;
    margin: 2rem auto;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--pgt-text-main);
    box-sizing: border-box;
}

.pgt-container * {
    box-sizing: border-box;
}

/* Structural Components */
.pgt-result-card, .pgt-settings-card, .pgt-history-card {
    background: var(--pgt-bg-card);
    border: 1px solid var(--pgt-border-color);
    border-radius: 16px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--pgt-shadow);
    transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.pgt-alert {
    background-color: #fed7d7;
    border: 1px solid #f5c6cb;
    color: #9b2c2c;
    padding: 0.75rem 1.25rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    animation: pgt-shake 0.4s ease-in-out;
}

.pgt-hidden {
    display: none !important;
}

/* Input Display Box Styling */
.pgt-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--pgt-input-inner-bg);
    border: 2px solid var(--pgt-border-color);
    border-radius: 10px;
    padding: 0.25rem 0.5rem;
    margin-bottom: 1rem;
}

.pgt-key-icon {
    color: var(--pgt-text-muted);
    padding-left: 0.75rem;
    font-size: 1.2rem;
}

.pgt-password-input {
    width: 100% !important;
    background: transparent !important;
    border: none !important;
    box-shadow: none !important;
    padding: 0.75rem 0.5rem !important;
    font-family: "Courier New", Courier, monospace !important;
    font-weight: 700 !important;
    font-size: 1.3rem !important;
    color: var(--pgt-text-main) !important;
    outline: none !important;
}

.pgt-action-buttons {
    display: flex;
    gap: 0.25rem;
}

.pgt-icon-btn {
    background: transparent;
    border: none;
    color: var(--pgt-text-muted);
    padding: 0.5rem;
    font-size: 1.15rem;
    cursor: pointer;
    border-radius: 6px;
    transition: background 0.2s, color 0.2s;
}

.pgt-icon-btn:hover {
    background: var(--pgt-secondary-btn-hover);
    color: var(--pgt-text-main);
}

/* Toast System Layout */
.pgt-toast {
    background: #2d3748;
    color: #fff;
    padding: 0.5rem 1rem;
    border-radius: 30px;
    font-size: 0.85rem;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    animation: pgt-fade-in 0.2s forwards;
}

/* Real-time Performance Metrics Display */
.pgt-metrics-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--pgt-text-muted);
    margin-bottom: 1rem;
}

.pgt-metric-val {
    font-weight: 700;
    color: var(--pgt-text-main);
}

/* Strength Diagnostics Elements */
.pgt-strength-section {
    margin-top: 0.5rem;
}

.pgt-strength-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.pgt-strength-title {
    font-weight: 600;
}

.pgt-strength-badge {
    padding: 0.2rem 0.6rem;
    border-radius: 30px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    color: #fff;
}

.pgt-progress-track {
    background: var(--pgt-border-color);
    border-radius: 30px;
    height: 8px;
    overflow: hidden;
}

.pgt-progress-fill {
    height: 100%;
    width: 0%;
    transition: width 0.3s ease-out, background-color 0.3s linear;
}

/* Dynamic Classes Map Engine */
.strength-weak { background-color: var(--pgt-weak) !important; }
.strength-medium { background-color: var(--pgt-medium) !important; }
.strength-strong { background-color: var(--pgt-strong) !important; }
.strength-very-strong { background-color: var(--pgt-very-strong) !important; }

/* Control Dashboard Configuration */
.pgt-settings-title {
    margin: 0 0 1.25rem 0;
    font-size: 1.15rem;
    font-weight: 700;
    border-bottom: 1px solid var(--pgt-border-color);
    padding-bottom: 0.5rem;
}

.pgt-slider-group {
    margin-bottom: 1.25rem;
}

.pgt-slider-labels {
    display: flex;
    justify-content: space-between;
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.pgt-badge {
    background: var(--pgt-secondary-btn-hover);
    padding: 0.1rem 0.5rem;
    border-radius: 4px;
    font-size: 0.85rem;
}

/* Custom Standardized Track Range Elements */
.pgt-slider-group input[type=range] {
    -webkit-appearance: none;
    width: 100%;
    background: transparent;
}

.pgt-slider-group input[type=range]:focus {
    outline: none;
}

.pgt-slider-group input[type=range]::-webkit-slider-runnable-track {
    width: 100%;
    height: 6px;
    cursor: pointer;
    background: var(--pgt-border-color);
    border-radius: 3px;
}

.pgt-slider-group input[type=range]::-webkit-slider-thumb {
    height: 18px;
    width: 18px;
    border-radius: 50%;
    background: #667eea;
    cursor: pointer;
    -webkit-appearance: none;
    margin-top: -6px;
}

/* Custom Checkbox Grid Framework */
.pgt-grid-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 0.75rem;
    margin-bottom: 1.25rem;
}

.pgt-checkbox-label {
    display: flex;
    align-items: center;
    position: relative;
    cursor: pointer;
    font-size: 0.9rem;
    user-select: none;
    padding-left: 28px;
}

.pgt-checkbox-label input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.pgt-custom-checkbox {
    position: absolute;
    top: 0;
    left: 0;
    height: 20px;
    width: 20px;
    background-color: var(--pgt-input-inner-bg);
    border: 2px solid var(--pgt-border-color);
    border-radius: 4px;
    transition: all 0.2s;
}

.pgt-checkbox-label:hover input ~ .pgt-custom-checkbox {
    border-color: #667eea;
}

.pgt-checkbox-label input:checked ~ .pgt-custom-checkbox {
    background-color: #667eea;
    border-color: #667eea;
}

.pgt-custom-checkbox:after {
    content: "";
    position: absolute;
    display: none;
    left: 6px;
    top: 2px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.pgt-checkbox-label input:checked ~ .pgt-custom-checkbox:after {
    display: block;
}

/* Constraint Elements Block Input styling */
.pgt-custom-input-group {
    margin-bottom: 1.5rem;
}

.pgt-field-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
    color: var(--pgt-text-muted);
}

.pgt-custom-input-group input[type=text] {
    width: 100%;
    padding: 0.6rem 0.75rem;
    border: 2px solid var(--pgt-border-color);
    border-radius: 8px;
    background: var(--pgt-input-inner-bg);
    color: var(--pgt-text-main);
    font-family: monospace;
}

/* Button UI Interfaces Base Settings */
.pgt-actions-footer {
    display: flex;
    gap: 1rem;
}

.pgt-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    flex: 1;
}

.pgt-btn-primary {
    background: var(--pgt-accent-gradient);
    color: #fff;
    box-shadow: 0 4px 6px rgba(102, 126, 234, 0.25);
}

.pgt-btn-primary:hover {
    background: var(--pgt-accent-hover);
    transform: translateY(-1px);
}

.pgt-btn-secondary {
    background: var(--pgt-secondary-btn);
    color: var(--pgt-text-main);
}

.pgt-btn-secondary:hover {
    background: var(--pgt-secondary-btn-hover);
}

/* Local Log UI History Structure */
.pgt-history-title {
    margin: 0 0 0.75rem 0;
    font-size: 1rem;
    font-weight: 700;
    color: var(--pgt-text-muted);
}

.pgt-history-list {
    list-style: none !important;
    padding: 0 !important;
    margin: 0 !important;
}

.pgt-history-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid var(--pgt-border-color);
    font-family: monospace;
    font-size: 0.9rem;
}

.pgt-history-list li:last-child {
    border-bottom: none;
}

.pgt-history-empty {
    color: var(--pgt-text-muted);
    font-family: sans-serif !important;
    font-style: italic;
    justify-content: center !important;
    padding: 0.5rem 0;
}

/* Animation Framework Foundations */
@keyframes pgt-fade-in {
    from { opacity: 0; transform: translate(-50%, 10px); }
    to { opacity: 1; transform: translate(-50%, 0); }
}

@keyframes pgt-shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-6px); }
    40%, 80% { transform: translateX(6px); }
}