/* CSS Custom Properties for Light/Dark Mode */
:root {
    --bg-color: #eceef1; /* Light blue-grey */
    --text-color: #2d3748;
    --button-bg: #dde4ec;
    --button-hover: #cbd5e0;
    --highlight-color: #85888d;
    --border-color: #cbd5e0;
    
    /* Theme toggle variables */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
         --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
     --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
     --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 10px 10px -5px rgb(0 0 0 / 0.04);
    
    /* Password strength colors */
    --strength-weak: #ef4444;
    --strength-fair: #f59e0b;
    --strength-good: #10b981;
    --strength-strong: #059669;
    --strength-very-strong: #047857;
}

/* Dark Mode Colors */
[data-theme="dark"] {
    --bg-color: #1e293b; /* Darker background for better contrast */
    --text-color: #f8fafc; /* Brighter text for better readability */
    --button-bg: #475569; /* Better button contrast */
    --button-hover: #64748b; /* Improved hover state */
    --highlight-color: #cbd5e1; /* Better highlight visibility */
    --border-color: #475569;
    
         /* Dark mode shadows */
     --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3), 0 2px 4px -2px rgb(0 0 0 / 0.3);
     --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.3), 0 4px 6px -4px rgb(0 0 0 / 0.3);
     --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.3), 0 10px 10px -5px rgb(0 0 0 / 0.2);
}

/* Add subtle gradient to dark mode background */
[data-theme="dark"] body {
    background: linear-gradient(145deg, #1e293b, #334155);
    color: var(--text-color);
}

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

html {
    scroll-behavior: smooth;
    width: 100%;
    height: 100%;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: all 0.3s ease;
    width: 100%;
}

/* Top Navigation */
.top-nav {
    background: var(--primary-gradient);
    padding: 1rem 0;
    box-shadow: var(--shadow-md);
    width: 100%;
    position: relative;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-home {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: white;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
}

.nav-home:hover {
    opacity: 0.9;
}

.nav-icon {
    font-size: 1.5rem;
}

.nav-breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
}

.theme-toggle {
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-left: auto;
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.theme-icon {
    font-size: 1.2rem;
    filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.2));
}

.breadcrumb-separator {
    color: rgba(255, 255, 255, 0.6);
}

.current-tool {
    font-weight: 500;
}

/* App Container */
.app-container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* App Header */
.app-header {
    text-align: center;
    padding: 3rem 2rem;
    margin-bottom: 2rem;
    background: linear-gradient(135deg, #059669 0%, #10b981 50%, #34d399 100%);
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.app-header::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120px;
    height: 120px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    z-index: 1;
}

.app-header::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
    z-index: 1;
}

.app-header h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    color: white;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    position: relative;
    z-index: 2;
}

.app-header p {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
    position: relative;
    z-index: 2;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.header-icons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 2;
}

.header-icon {
    font-size: 3rem;
    opacity: 0.9;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
    animation: float 3s ease-in-out infinite;
}

.header-icon:nth-child(2) {
    animation-delay: 1.5s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

/* Main Content */
.main-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-bottom: 3rem;
}

/* Tab Navigation */
.tab-navigation {
    display: flex;
    background: var(--bg-color);
    border-radius: 15px;
    padding: 0.5rem;
    box-shadow: var(--shadow-md);
    gap: 0.5rem;
}

.tab-btn {
    flex: 1;
    padding: 1rem 1.5rem;
    border: none;
    border-radius: 10px;
    background: transparent;
    color: var(--text-color);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    opacity: 0.7;
}

.tab-btn:hover {
    opacity: 0.9;
    background: var(--button-bg);
}

.tab-btn.active {
    background: var(--primary-gradient);
    color: white;
    opacity: 1;
    box-shadow: var(--shadow-md);
}

/* Tab Content */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Username Display */
.username-display {
    background: var(--bg-color);
    border-radius: 15px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    text-align: center;
}

.username-field {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    align-items: center;
}

#generatedUsername {
    flex: 1;
    padding: 1rem;
    font-size: 1.2rem;
    font-family: 'Courier New', monospace;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    background: var(--bg-color);
    color: var(--text-color);
    text-align: center;
    letter-spacing: 1px;
}

.username-availability {
    display: flex;
    justify-content: center;
}

.availability-text {
    font-size: 0.9rem;
    color: var(--text-color);
    opacity: 0.8;
    padding: 0.5rem 1rem;
    background: var(--button-bg);
    border-radius: 8px;
}

/* Username Style Group */
.username-style-group {
    margin-bottom: 2rem;
}

.username-style-group h4 {
    margin-bottom: 1rem;
    color: var(--text-color);
    font-size: 1.2rem;
}

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

.radio-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    padding: 0.75rem;
    border-radius: 8px;
    transition: background-color 0.3s ease;
}

.radio-label:hover {
    background: var(--button-bg);
}

.radio-label input[type="radio"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-gradient);
}

.radio-text {
    color: var(--text-color);
    font-weight: 500;
}

/* Username List */
.username-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.username-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--button-bg);
    border-radius: 8px;
    border-left: 4px solid var(--primary-gradient);
}

.username-text {
    font-family: 'Courier New', monospace;
    font-size: 1rem;
    color: var(--text-color);
    letter-spacing: 1px;
}

.username-actions {
    display: flex;
    gap: 0.5rem;
}

.username-actions button {
    padding: 0.5rem;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.3s ease;
}

.username-actions button:hover {
    background: var(--button-hover);
}

.no-usernames {
    text-align: center;
    color: var(--text-color);
    opacity: 0.6;
    font-style: italic;
}

/* Multiple Usernames Modal */
.multiple-usernames {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
    max-height: 300px;
    overflow-y: auto;
}

.multiple-username-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--button-bg);
    border-radius: 8px;
    border-left: 4px solid var(--primary-gradient);
}

.multiple-username-text {
    font-family: 'Courier New', monospace;
    font-size: 1rem;
    color: var(--text-color);
    letter-spacing: 1px;
}

.multiple-username-copy {
    padding: 0.5rem;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.3s ease;
}

.multiple-username-copy:hover {
    background: var(--button-hover);
}

/* Password Display */
.password-display {
    background: var(--bg-color);
    border-radius: 15px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    text-align: center;
}

.password-field {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    align-items: center;
}

#generatedPassword {
    flex: 1;
    padding: 1rem;
    font-size: 1.2rem;
    font-family: 'Courier New', monospace;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    background: var(--bg-color);
    color: var(--text-color);
    text-align: center;
    letter-spacing: 2px;
}

.copy-btn {
    padding: 1rem;
    background: var(--primary-gradient);
    border: none;
    border-radius: 10px;
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 60px;
}

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

.copy-icon {
    font-size: 1.2rem;
}

/* Password Strength */
.password-strength {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    align-items: center;
}

.strength-bar {
    width: 100%;
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.strength-fill {
    height: 100%;
    width: 0%;
    transition: all 0.3s ease;
    border-radius: 4px;
}

.strength-text {
    font-size: 0.9rem;
    color: var(--text-color);
    opacity: 0.8;
}

/* Options Section */
.options-section {
    background: var(--bg-color);
    border-radius: 15px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
}

.options-section h3 {
    margin-bottom: 1.5rem;
    color: var(--text-color);
    font-size: 1.5rem;
}

.option-group {
    margin-bottom: 2rem;
}

.option-label {
    display: flex;
    align-items: center;
    gap: 1rem;
    cursor: pointer;
}

#lengthSlider {
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: var(--border-color);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

#lengthSlider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-gradient);
    cursor: pointer;
    box-shadow: var(--shadow-md);
}

#lengthSlider::-moz-range-thumb {
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-gradient);
    cursor: pointer;
    box-shadow: var(--shadow-md);
    border: none;
}

.option-text {
    font-weight: 500;
    color: var(--text-color);
    min-width: 200px;
}

/* Checkbox Group */
.checkbox-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    padding: 0.75rem;
    border-radius: 8px;
    transition: background-color 0.3s ease;
}

.checkbox-label:hover {
    background: var(--button-bg);
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-gradient);
}

.checkbox-text {
    color: var(--text-color);
    font-weight: 500;
}

/* Button Group */
.button-group {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.generate-btn, .secondary-btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 200px;
}

.generate-btn {
    background: var(--primary-gradient);
    color: white;
    box-shadow: var(--shadow-md);
}

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

.secondary-btn {
    background: var(--button-bg);
    color: var(--text-color);
    border: 2px solid var(--border-color);
}

.secondary-btn:hover {
    background: var(--button-hover);
    transform: translateY(-2px);
}

/* History Section */
.history-section {
    background: var(--bg-color);
    border-radius: 15px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.history-header h3 {
    color: var(--text-color);
    font-size: 1.5rem;
}

.clear-btn {
    padding: 0.5rem 1rem;
    background: var(--button-bg);
    border: none;
    border-radius: 8px;
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.password-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.password-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--button-bg);
    border-radius: 8px;
    border-left: 4px solid var(--primary-gradient);
}

.password-text {
    font-family: 'Courier New', monospace;
    font-size: 1rem;
    color: var(--text-color);
    letter-spacing: 1px;
}

.password-actions {
    display: flex;
    gap: 0.5rem;
}

.password-actions button {
    padding: 0.5rem;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.3s ease;
}

.password-actions button:hover {
    background: var(--button-hover);
}

.no-passwords {
    text-align: center;
    color: var(--text-color);
    opacity: 0.6;
    font-style: italic;
}

/* Tips Section */
.tips-section {
    background: var(--bg-color);
    border-radius: 15px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
}

.tips-section h3 {
    margin-bottom: 1.5rem;
    color: var(--text-color);
    font-size: 1.5rem;
    text-align: center;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.tip-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--button-bg);
    border-radius: 10px;
    transition: transform 0.3s ease;
}

.tip-item:hover {
    transform: translateY(-2px);
}

.tip-icon {
    font-size: 2rem;
    opacity: 0.8;
}

.tip-item p {
    color: var(--text-color);
    font-weight: 500;
    line-height: 1.4;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: var(--bg-color);
    margin: 5% auto;
    padding: 0;
    border-radius: 15px;
    width: 90%;
    max-width: 600px;
    box-shadow: var(--shadow-xl);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    color: var(--text-color);
    font-size: 1.5rem;
}

.close-btn {
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--text-color);
    cursor: pointer;
    padding: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background-color 0.3s ease;
}

.close-btn:hover {
    background: var(--button-bg);
}

.modal-body {
    padding: 2rem;
}

.modal-options {
    margin-bottom: 2rem;
}

.modal-options label {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: var(--text-color);
    font-weight: 500;
}

.modal-options input {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-color);
    color: var(--text-color);
    width: 80px;
}

.multiple-passwords {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
    max-height: 300px;
    overflow-y: auto;
}

.multiple-password-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--button-bg);
    border-radius: 8px;
    border-left: 4px solid var(--primary-gradient);
}

.multiple-password-text {
    font-family: 'Courier New', monospace;
    font-size: 1rem;
    color: var(--text-color);
    letter-spacing: 1px;
}

.multiple-password-copy {
    padding: 0.5rem;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.3s ease;
}

.multiple-password-copy:hover {
    background: var(--button-hover);
}

.modal-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.copy-all-btn, .generate-new-btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 150px;
}

.copy-all-btn {
    background: var(--primary-gradient);
    color: white;
}

.generate-new-btn {
    background: var(--button-bg);
    color: var(--text-color);
    border: 2px solid var(--border-color);
}

.copy-all-btn:hover, .generate-new-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* App Footer */
.app-footer {
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-color);
    opacity: 0.8;
}

/* Mobile Responsiveness */
@media (max-width: 600px) {
    .nav-container {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }
    
    .app-header {
        padding: 2rem 1rem;
        margin: 0 1rem 2rem 1rem;
    }
    
    .app-header h1 {
        font-size: 2.5rem;
    }
    
    .app-header p {
        font-size: 1rem;
    }
    
    .header-icon {
        font-size: 2.5rem;
    }
    
    .tab-navigation {
        flex-direction: column;
        gap: 0.25rem;
    }
    
    .tab-btn {
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
    }
    
    .password-field, .username-field {
        flex-direction: column;
    }
    
    .checkbox-group, .radio-group {
        grid-template-columns: 1fr;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .generate-btn, .secondary-btn {
        min-width: auto;
        width: 100%;
    }
    
    .tips-grid {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        width: 95%;
        margin: 10% auto;
    }
    
    .modal-header, .modal-body {
        padding: 1rem;
    }
}