/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --secondary-color: #10b981;
    --secondary-dark: #059669;
    --danger-color: #ef4444;
    --danger-dark: #dc2626;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    
    /* Neutral Colors */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 200ms ease-in-out;
    --transition-slow: 300ms ease-in-out;
}

body {
    font-family: var(--font-family);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header Styles */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-xl) 0;
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.site-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.site-tagline {
    font-size: 1.125rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* Main Content */
.main-content {
    padding-bottom: var(--spacing-2xl);
}

/* Password Generator Section */
.password-generator {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.password-display-section {
    margin-bottom: var(--spacing-2xl);
}

.password-wrapper {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    align-items: stretch;
}

.password-output {
    flex: 1;
    padding: var(--spacing-lg);
    font-family: var(--font-mono);
    font-size: 1.25rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    transition: all var(--transition-base);
    letter-spacing: 0.05em;
    min-height: 60px;
}

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

.password-actions {
    display: flex;
    gap: var(--spacing-sm);
    align-items: stretch;
}

.btn-icon,
.btn-copy {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    font-weight: 500;
    font-size: 0.875rem;
    gap: var(--spacing-xs);
}

.btn-icon {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    min-width: 48px;
}

.btn-icon:hover {
    background: var(--border-color);
    transform: rotate(90deg);
}

.btn-icon:active {
    transform: rotate(180deg);
}

.btn-copy {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    min-width: 100px;
}

.btn-copy:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-copy svg {
    width: 18px;
    height: 18px;
}

/* Password Strength Section */
.password-strength-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.strength-bar-wrapper {
    flex: 1;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.strength-bar {
    height: 100%;
    width: 0%;
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
    background: linear-gradient(90deg, var(--danger-color), var(--warning-color), var(--success-color));
}

.strength-bar.weak {
    width: 33%;
    background: var(--danger-color);
}

.strength-bar.medium {
    width: 66%;
    background: var(--warning-color);
}

.strength-bar.strong {
    width: 100%;
    background: var(--success-color);
}

.strength-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 500;
    font-size: 0.875rem;
    min-width: 140px;
}

.strength-icon {
    font-size: 1.25rem;
}

.strength-text {
    color: var(--text-secondary);
}

/* Settings Section */
.password-settings-section {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
}

.settings-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.setting-group {
    margin-bottom: var(--spacing-xl);
}

.setting-group:last-child {
    margin-bottom: 0;
}

.setting-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    font-size: 1rem;
}

.length-value {
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 700;
    min-width: 50px;
    text-align: center;
}

/* Slider Styles */
.length-slider {
    width: 100%;
    height: 8px;
    border-radius: var(--radius-full);
    background: var(--bg-tertiary);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    margin-bottom: var(--spacing-sm);
    cursor: pointer;
}

.length-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.length-slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    background: var(--primary-dark);
}

.length-slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.length-slider::-moz-range-thumb:hover {
    transform: scale(1.1);
    background: var(--primary-dark);
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-light);
    margin-top: var(--spacing-xs);
}

/* Checkbox Styles */
.characters-fieldset {
    border: none;
    padding: 0;
    margin: 0;
}

.characters-fieldset legend {
    margin-bottom: var(--spacing-md);
}

.checkbox-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: background var(--transition-base);
    user-select: none;
}

.checkbox-label:hover {
    background: rgba(37, 99, 235, 0.05);
}

.checkbox-input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.checkbox-custom {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
    flex-shrink: 0;
    background: white;
}

.checkbox-input:checked + .checkbox-custom {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.checkbox-input:checked + .checkbox-custom::after {
    content: '✓';
    color: white;
    font-weight: bold;
    font-size: 14px;
}

.checkbox-text {
    color: var(--text-primary);
    font-size: 0.9375rem;
}

/* Generate Button */
.btn-generate {
    width: 100%;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
}

.btn-generate:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

/* Info Section */
.info-section {
    max-width: 1000px;
    margin: 0 auto;
}

.info-title {
    font-size: 2rem;
    font-weight: 700;
    color: white;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.info-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base);
}

.info-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.info-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.info-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Blog Section */
.blog-section {
    padding: var(--spacing-2xl) 0;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
}

.blog-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.blog-article {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
}

.blog-header {
    border-bottom: 2px solid var(--border-color);
    padding-bottom: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.blog-title {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.blog-meta {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    font-style: italic;
}

.blog-content {
    color: var(--text-primary);
    line-height: 1.8;
    font-size: 1.0625rem;
}

.blog-intro {
    font-size: 1.1875rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.05), rgba(16, 185, 129, 0.05));
    border-left: 4px solid var(--primary-color);
    border-radius: var(--radius-md);
}

.blog-content h2 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--border-color);
}

.blog-content h3 {
    font-size: 1.375rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.blog-content p {
    margin-bottom: var(--spacing-lg);
    text-align: justify;
}

.blog-content p:last-child {
    margin-bottom: 0;
}

.blog-content strong {
    font-weight: 600;
    color: var(--text-primary);
}

.blog-content ul,
.blog-content ol {
    margin: var(--spacing-lg) 0;
    padding-left: var(--spacing-xl);
}

.blog-content li {
    margin-bottom: var(--spacing-sm);
    line-height: 1.8;
}

.blog-content a {
    color: var(--primary-color);
    text-decoration: underline;
    transition: color var(--transition-base);
}

.blog-content a:hover {
    color: var(--primary-dark);
}

/* Footer */
.footer {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: var(--spacing-xl) 0;
    text-align: center;
    color: var(--text-secondary);
    margin-top: var(--spacing-2xl);
}

.footer-note {
    margin-top: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--text-light);
}

/* Copy Notification */
.copy-notification {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    background: var(--success-color);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    font-weight: 500;
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--transition-base);
    pointer-events: none;
    z-index: 1000;
}

.copy-notification.show {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 768px) {
    .site-title {
        font-size: 2rem;
    }
    
    .password-generator {
        padding: var(--spacing-lg);
    }
    
    .password-wrapper {
        flex-direction: column;
    }
    
    .password-actions {
        width: 100%;
    }
    
    .btn-copy {
        flex: 1;
    }
    
    .strength-label {
        min-width: auto;
    }
    
    .checkbox-group {
        grid-template-columns: 1fr;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
    }
    
    .blog-article {
        padding: var(--spacing-lg);
    }
    
    .blog-title {
        font-size: 1.75rem;
    }
    
    .blog-content {
        font-size: 1rem;
    }
    
    .blog-content h2 {
        font-size: 1.5rem;
    }
    
    .blog-content h3 {
        font-size: 1.25rem;
    }
    
    .copy-notification {
        right: var(--spacing-md);
        bottom: var(--spacing-md);
        left: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .site-title {
        font-size: 1.75rem;
    }
    
    .password-output {
        font-size: 1rem;
        padding: var(--spacing-md);
    }
    
    .password-settings-section {
        padding: var(--spacing-lg);
    }
    
    .blog-article {
        padding: var(--spacing-md);
    }
    
    .blog-title {
        font-size: 1.5rem;
    }
    
    .blog-content {
        font-size: 0.9375rem;
    }
    
    .blog-content h2 {
        font-size: 1.25rem;
    }
    
    .blog-content h3 {
        font-size: 1.125rem;
    }
    
    .blog-intro {
        font-size: 1rem;
        padding: var(--spacing-md);
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus Styles for Keyboard Navigation */
button:focus-visible,
input:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .header,
    .footer,
    .password-actions,
    .btn-generate {
        display: none;
    }
    
    .password-generator {
        box-shadow: none;
        border: 1px solid var(--border-color);
    }
}