* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors */
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    --success-color: #4ade80;
    --warning-color: #fbbf24;
    --danger-color: #f87171;
    
    /* Neutral colors */
    --bg-primary: #0f0f23;
    --bg-secondary: #1a1a2e;
    --bg-card: rgba(255, 255, 255, 0.05);
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    
    /* Borders and shadows */
    --border-color: rgba(255, 255, 255, 0.1);
    --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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Rounded borders */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Animation */
.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(-45deg, #667eea, #764ba2, #f093fb, #f5576c);
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
    opacity: 0.1;
    z-index: -1;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
    position: relative;
    z-index: 1;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 3rem;
}

.header-content {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 2.5rem 2rem;
    box-shadow: var(--shadow-xl);
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.logo i {
    font-size: 2.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-weight: 400;
}

.security-notice {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(251, 191, 36, 0.1);
    border: 1px solid rgba(251, 191, 36, 0.2);
    border-radius: var(--radius-lg);
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    color: var(--warning-color);
}

/* Main sections */
.main-content {
    display: grid;
    gap: 2rem;
}

.generator-section {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 2rem;
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.generator-section:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.section-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.section-icon {
    width: 3rem;
    height: 3rem;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: white;
}

.section-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Generator cards */
.generator-card {
    display: grid;
    gap: 1.5rem;
}

/* Output field */
.output-container {
    display: grid;
    gap: 0.75rem;
}

.output-field {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: border-color var(--transition-fast);
}

.output-field:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.output-input {
    flex: 1;
    background: transparent;
    border: none;
    padding: 1rem;
    color: var(--text-primary);
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    outline: none;
}

.output-input::placeholder {
    color: var(--text-muted);
}

.field-actions {
    display: flex;
    padding: 0.5rem;
    gap: 0.25rem;
}

.action-btn {
    width: 2.5rem;
    height: 2.5rem;
    border: none;
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.action-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    transform: scale(1.05);
}

.action-btn:active {
    transform: scale(0.95);
}

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

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

/* Password strength indicator */
.strength-indicator {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.strength-bar {
    flex: 1;
    height: 0.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.strength-fill {
    height: 100%;
    border-radius: var(--radius-sm);
    transition: width var(--transition-normal), background-color var(--transition-normal);
    background: linear-gradient(90deg, var(--danger-color), var(--warning-color), var(--success-color));
}

.strength-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
    min-width: 120px;
}

/* Controls */
.controls-container {
    display: grid;
    gap: 1.5rem;
}

.length-control {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.length-control label {
    font-weight: 500;
    color: var(--text-primary);
    min-width: 100px;
}

.spinner-container {
    display: flex;
    align-items: center;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.spinner-btn {
    width: 2.5rem;
    height: 2.5rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.spinner-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.spinner-container input {
    width: 4rem;
    background: transparent;
    border: none;
    padding: 0.5rem;
    text-align: center;
    color: var(--text-primary);
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    outline: none;
}

/* Checkbox options */
.options-container {
    margin-top: 0.5rem;
}

.option-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.checkbox-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    padding: 0.75rem;
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.checkbox-container:hover {
    background: rgba(255, 255, 255, 0.05);
}

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

.checkmark {
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    position: relative;
    transition: all var(--transition-fast);
}

.checkbox-container input[type="checkbox"]:checked + .checkmark {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-color: var(--primary-color);
}

.checkbox-container input[type="checkbox"]:checked + .checkmark::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 0.75rem;
    font-weight: bold;
}

.option-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* UUID information */
.uuid-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.info-text {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-style: italic;
}

/* Footer */
.footer {
    margin-top: 4rem;
    text-align: center;
}

.footer-content {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 2rem;
    box-shadow: var(--shadow-lg);
}

.footer-content p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
}

.footer-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--primary-color);
}

/* Notification toast */
.toast {
    position: fixed;
    top: 2rem;
    right: 2rem;
    background: var(--bg-secondary);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1rem 1.5rem;
    box-shadow: var(--shadow-xl);
    transform: translateX(100%);
    opacity: 0;
    transition: all var(--transition-normal);
    z-index: 1000;
    max-width: 300px;
}

.toast.show {
    transform: translateX(0);
    opacity: 1;
}

.toast-content {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

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

.toast-message {
    font-size: 0.875rem;
    color: var(--text-primary);
}

.toast.success .toast-icon {
    color: var(--success-color);
}

.toast.error .toast-icon {
    color: var(--danger-color);
}

/* Responsiveness */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .header-content {
        padding: 2rem 1.5rem;
    }
    
    .logo {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .logo h1 {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .generator-section {
        padding: 1.5rem;
    }
    
    .section-header {
        flex-direction: column;
        text-align: center;
        gap: 0.75rem;
    }
    
    .length-control {
        flex-direction: column;
        align-items: stretch;
        gap: 0.75rem;
    }
    
    .length-control label {
        min-width: auto;
    }
    
    .option-group {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 1rem;
    }
    
    .toast {
        top: 1rem;
        right: 1rem;
        left: 1rem;
        max-width: none;
    }
}

@media (max-width: 480px) {
    .output-input {
        font-size: 0.75rem;
        padding: 0.75rem;
    }
    
    .field-actions {
        flex-direction: column;
        padding: 0.25rem;
    }
    
    .action-btn {
        width: 2rem;
        height: 2rem;
    }
}

/* Extra animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.generator-section {
    animation: fadeInUp 0.6s ease forwards;
}

.generator-section:nth-child(2) {
    animation-delay: 0.1s;
}

.generator-section:nth-child(3) {
    animation-delay: 0.2s;
}

/* Improved focus states */
.output-input:focus,
.spinner-container input:focus {
    outline: none;
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .background-animation {
        animation: none;
    }
}