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

:root {
    /* Color Scheme - Matching ipaddr.ro */
    --bg-primary: #F8F9FA;
    --bg-card: #FFFFFF;
    --text-primary: #343A40;
    --text-secondary: #6C757D;
    --text-tertiary: #ADB5BD;
    --button-bg: #343A40;
    --button-hover: #495057;
    --border-color: #E9ECEF;
    --shadow: rgba(0, 0, 0, 0.05);
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius: 8px;
    --radius-lg: 12px;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding: var(--spacing-md);
}

/* Header Styles */
header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-top: var(--spacing-lg);
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

header h1 a {
    text-decoration: none;
    color: inherit;
    transition: opacity 0.2s;
}

header h1 a:hover {
    opacity: 0.8;
}

.tagline {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* Main Container */
main {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
}

.container {
    width: 100%;
}

/* Card Styles */
.card {
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    box-shadow: 0 2px 8px var(--shadow);
    border: 1px solid var(--border-color);
}

.password-display-card {
    margin-bottom: var(--spacing-md);
}

.card-label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    font-weight: 400;
}

/* Password Display */
.password-wrapper {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.password-output {
    flex: 1;
    font-size: 1.5rem;
    font-weight: 700;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    background-color: var(--bg-card);
    color: var(--text-primary);
    font-family: 'Courier New', monospace;
    letter-spacing: 0.05em;
    outline: none;
    transition: border-color 0.2s;
}

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

.password-output::placeholder {
    color: var(--text-tertiary);
    font-weight: 400;
}

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius);
    font-family: var(--font-family);
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    white-space: nowrap;
}

.btn svg {
    width: 20px;
    height: 20px;
    stroke-width: 2;
}

.btn-copy {
    background-color: var(--button-bg);
    color: #FFFFFF;
    flex-shrink: 0;
}

.btn-copy:hover {
    background-color: var(--button-hover);
}

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

.btn-primary {
    background-color: var(--button-bg);
    color: #FFFFFF;
    width: 100%;
    justify-content: center;
    padding: var(--spacing-md);
    font-size: 1rem;
    margin-top: var(--spacing-md);
}

.btn-primary:hover {
    background-color: var(--button-hover);
}

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

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

.control-label {
    display: block;
    font-size: 0.9375rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    font-weight: 400;
}

#lengthValue {
    color: var(--text-primary);
    font-weight: 600;
}

/* Slider Styles */
.slider {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--border-color);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--button-bg);
    cursor: pointer;
    transition: background 0.2s;
}

.slider::-webkit-slider-thumb:hover {
    background: var(--button-hover);
}

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--button-bg);
    cursor: pointer;
    border: none;
    transition: background 0.2s;
}

.slider::-moz-range-thumb:hover {
    background: var(--button-hover);
}

/* Checkbox Group */
.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    font-size: 0.9375rem;
    color: var(--text-primary);
    user-select: none;
}

.checkbox {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--button-bg);
    flex-shrink: 0;
}

.checkbox-text {
    flex: 1;
}

/* Footer */
footer {
    text-align: center;
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-xl);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background-color: var(--button-bg);
    color: #FFFFFF;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius);
    font-size: 0.9375rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1000;
    pointer-events: none;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    .tagline {
        font-size: 0.875rem;
    }
    
    .password-output {
        font-size: 1.25rem;
    }
    
    .card {
        padding: var(--spacing-md);
    }
    
    .password-wrapper {
        flex-direction: column;
    }
    
    .btn-copy {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    body {
        padding: var(--spacing-sm);
    }
    
    header {
        margin-bottom: var(--spacing-lg);
        padding-top: var(--spacing-md);
    }
    
    header h1 {
        font-size: 1.75rem;
    }
    
    .password-output {
        font-size: 1.125rem;
        padding: var(--spacing-xs) var(--spacing-sm);
    }
}

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

/* Focus Styles for Accessibility */
button:focus-visible,
input:focus-visible {
    outline: 2px solid var(--button-bg);
    outline-offset: 2px;
}