/**
 * Main Stylesheet - Core styles for the Secure Password Generator
 * Provides responsive layout, typography, and accessibility features
 */

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

:root {
    /* Color Palette */
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --success-color: #22c55e;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-accent: #f3f4f6;
    --border-color: #d1d5db;
    --border-focus: #2563eb;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', monospace;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #f9fafb;
        --text-secondary: #d1d5db;
        --bg-primary: #111827;
        --bg-secondary: #1f2937;
        --bg-accent: #374151;
        --border-color: #4b5563;
    }
}

/* Base Elements */
html {
    font-size: 16px;
    line-height: 1.5;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.25;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: var(--font-size-2xl);
    color: var(--text-primary);
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background-color: var(--bg-accent);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

/* Main Layout */
.app-container {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.app-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    opacity: 0.8;
    transition: opacity var(--transition-normal);
}

.app-header.initialized {
    opacity: 1;
}

.app-description {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-top: var(--spacing-sm);
}

/* Sections */
.generator-section,
.results-section,
.strength-section {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

/* Control Groups */
.control-group {
    margin-bottom: var(--spacing-xl);
}

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

.control-label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.help-text {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
}

/* Form Controls */
input[type="range"] {
    width: 100%;
    height: 8px;
    background: var(--bg-accent);
    border-radius: var(--radius-sm);
    outline: none;
    border: none;
    cursor: pointer;
    margin: var(--spacing-sm) 0;
}

input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--primary-hover);
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    transition: background-color var(--transition-fast);
}

input[type="range"]::-moz-range-thumb:hover {
    background: var(--primary-hover);
}

/* Fieldsets */
fieldset {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin: var(--spacing-md) 0;
}

legend {
    font-weight: 500;
    padding: 0 var(--spacing-sm);
    color: var(--text-primary);
}

/* Checkbox Styling */
.checkbox-label {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-md);
    cursor: pointer;
    user-select: none;
    font-weight: normal;
}

.checkbox-label:last-child {
    margin-bottom: 0;
}

.checkbox-label input[type="checkbox"] {
    margin-right: var(--spacing-sm);
    transform: scale(1.2);
    cursor: pointer;
}

/* Buttons */
.generate-button {
    width: 100%;
    padding: var(--spacing-lg) var(--spacing-xl);
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-lg);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.generate-button:hover:not(:disabled) {
    background-color: var(--primary-hover);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.generate-button:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.generate-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.generate-button:focus {
    outline: 2px solid var(--border-focus);
    outline-offset: 2px;
}

/* Footer */
.app-footer {
    margin-top: auto;
    text-align: center;
    padding-top: var(--spacing-2xl);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

/* Error Messages */
.error-message {
    background-color: #fef2f2;
    border: 1px solid #fecaca;
    color: #991b1b;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin: var(--spacing-md) 0;
    font-size: var(--font-size-sm);
}

/* Fatal Error Styling */
.fatal-error {
    max-width: 600px;
    margin: 50px auto;
    padding: 40px;
    text-align: center;
    background: #fef2f2;
    border: 2px solid var(--error-color);
    border-radius: var(--radius-lg);
    color: var(--error-color);
}

.retry-button {
    margin-top: 20px;
    padding: 10px 20px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: var(--font-size-base);
}

/* Notifications */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    color: white;
    font-weight: 500;
    z-index: 1000;
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease-out;
}

.notification-success {
    background-color: var(--success-color);
}

.notification-error {
    background-color: var(--error-color);
}

.notification-warning {
    background-color: var(--warning-color);
}

.notification-info {
    background-color: var(--primary-color);
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

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

/* Focus management */
*:focus {
    outline: 2px solid var(--border-focus);
    outline-offset: 2px;
}

/* Skip navigation for screen readers */
.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;
}

/* Responsive Design */
@media (max-width: 768px) {
    .app-container {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .generator-section,
    .results-section,
    .strength-section {
        padding: var(--spacing-lg);
    }
    
    h1 {
        font-size: var(--font-size-xl);
    }
    
    .app-description {
        font-size: var(--font-size-base);
    }
}

@media (max-width: 480px) {
    .app-container {
        padding: var(--spacing-md) var(--spacing-sm);
    }
    
    .generator-section,
    .results-section,
    .strength-section {
        padding: var(--spacing-md);
    }
    
    .generate-button {
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: var(--font-size-base);
    }
}

/* Print styles */
@media print {
    .app-container {
        max-width: none;
        padding: 0;
    }
    
    .generate-button,
    .copy-button {
        display: none;
    }
    
    .password-text {
        border: 1px solid #000;
        padding: var(--spacing-sm);
    }
}