/* SecurePass Generator - Modern, Responsive Design */
:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --border-color: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --radius: 12px;
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #f9fafb;
        --text-secondary: #d1d5db;
        --bg-primary: #1f2937;
        --bg-secondary: #111827;
        --border-color: #374151;
    }
}

.securepass-container {
    max-width: 500px;
    margin: 0 auto;
    padding: 2rem;
    background: var(--bg-primary);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    border: 1px solid var(--border-color);
}

.securepass-controls {
    margin-bottom: 1.5rem;
}

.securepass-length-control {
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius);
}

.securepass-length-control label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

#securepass-length {
    width: 100%;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
}

#securepass-length::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

#securepass-length::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

.securepass-length-value {
    display: inline-block;
    min-width: 2rem;
    text-align: center;
    font-weight: 600;
    color: var(--primary-color);
    font-size: 1.1rem;
}

.securepass-charsets {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.securepass-charset {
    display: flex;
    align-items: center;
    cursor: pointer;
    padding: 0.75rem;
    border-radius: 8px;
    transition: var(--transition);
    border: 2px solid transparent;
}

.securepass-charset:hover {
    background: var(--bg-secondary);
}

.securepass-charset input[type="checkbox"] {
    display: none;
}

.securepass-charset .checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    margin-right: 0.75rem;
    position: relative;
    flex-shrink: 0;
    transition: var(--transition);
}

.securepass-charset input:checked + .checkmark {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.securepass-charset input:checked + .checkmark::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-weight: bold;
    font-size: 12px;
}

.securepass-charset label {
    cursor: pointer;
    font-weight: 500;
    color: var(--text-primary);
    user-select: none;
}

.securepass-generate-btn {
    width: 100%;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.securepass-generate-btn:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.4);
}

.securepass-generate-btn:active {
    transform: translateY(0);
}

.securepass-output {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: var(--radius);
}

.securepass-password-wrapper {
    position: relative;
    margin-bottom: 1rem;
}

#securepass-output {
    width: 100%;
    padding: 1rem 3.5rem 1rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    font-family: 'Courier New', monospace;
    font-size: 1.2rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    letter-spacing: 1px;
    transition: var(--transition);
}

#securepass-output:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.securepass-toggle {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: var(--transition);
    color: var(--text-secondary);
}

.securepass-toggle:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.securepass-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

.securepass-copy-btn {
    flex: 1;
    min-width: 100px;
    padding: 0.75rem 1.5rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition);
}

.securepass-copy-btn:not(:disabled):hover {
    border-color: var(--success-color);
    background: var(--success-color);
    color: white;
}

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

.securepass-strength {
    flex: 1;
    min-width: 120px;
}

.strength-meter {
    width: 100%;
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.25rem;
}

.strength-fill {
    height: 100%;
    width: 0%;
    transition: var(--transition);
    border-radius: 4px;
}

.strength-weak .strength-fill { background: var(--danger-color); }
.strength-medium .strength-fill { background: var(--warning-color); width: 50%; }
.strength-strong .strength-fill { background: var(--success-color); width: 75%; }
.strength-very-strong .strength-fill { background: #059669; width: 100%; }

.strength-text {
    font-size: 0.85rem;
    font-weight: 500;
    display: block;
}

.securepass-status {
    margin-top: 1rem;
    padding: 0.75rem;
    border-radius: 8px;
    font-weight: 500;
    text-align: center;
    opacity: 0;
    transform: translateY(-10px);
    transition: var(--transition);
}

.securepass-status.show {
    opacity: 1;
    transform: translateY(0);
}

.securepass-status.success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.securepass-status.copied {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

/* Mobile responsiveness */
@media (max-width: 640px) {
    .securepass-container {
        margin: 0 1rem;
        padding: 1.5rem;
    }
    
    .securepass-charsets {
        grid-template-columns: 1fr;
    }
    
    .securepass-actions {
        flex-direction: column;
    }
    
    .securepass-copy-btn {
        width: 100%;
    }
}

/* Touch targets for mobile */
@media (hover: none) and (pointer: coarse) {
    .securepass-charset,
    .securepass-generate-btn,
    .securepass-toggle,
    .securepass-copy-btn {
        min-height: 44px;
    }
}

/* Focus styles for accessibility */
.securepass-charset:focus-within,
.securepass-generate-btn:focus,
.securepass-toggle:focus,
.securepass-copy-btn:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Screen reader only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}