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

:root {
    --primary-color: #3b82f6;
    --primary-dark: #2563eb;
    --secondary-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --background-primary: #0f172a;
    --background-secondary: #1e293b;
    --background-tertiary: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    --border-color: #475569;
    --gradient-primary: linear-gradient(135deg, #3b82f6, #8b5cf6);
    --gradient-secondary: linear-gradient(135deg, #10b981, #059669);
    --gradient-danger: linear-gradient(135deg, #ef4444, #dc2626);
    --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);
}

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

/* Utility Classes */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: var(--background-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo i {
    font-size: 1.8rem;
}

.nav {
    display: flex;
    gap: 30px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

.language-btn {
    background: var(--background-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px 15px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
}

.language-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Hero Section */
.hero {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--background-primary) 0%, var(--background-secondary) 100%);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, rgba(59, 130, 246, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 50px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 50px;
    margin-top: 60px;
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--secondary-color);
    display: block;
}

.stat-text {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 5px;
}

/* Generator Section */
.generator-section {
    padding: 80px 0;
    background: var(--background-secondary);
}

.generator-card {
    background: var(--background-primary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 40px;
    box-shadow: var(--shadow-xl);
    max-width: 800px;
    margin: 0 auto;
}

.generator-card h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 30px;
    color: var(--text-primary);
}

.password-display {
    margin-bottom: 30px;
}

.password-container {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

.password-input {
    flex: 1;
    padding: 15px 20px;
    background: var(--background-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 1.1rem;
    transition: all 0.3s ease;
}

.password-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.copy-btn {
    padding: 15px 20px;
    background: var(--gradient-primary);
    border: none;
    border-radius: 12px;
    color: white;
    cursor: pointer;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    min-width: 60px;
}

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

.password-strength {
    display: flex;
    align-items: center;
    gap: 15px;
}

.strength-bar {
    flex: 1;
    height: 8px;
    background: var(--background-secondary);
    border-radius: 4px;
    overflow: hidden;
}

.strength-fill {
    height: 100%;
    width: 0%;
    transition: all 0.5s ease;
    border-radius: 4px;
}

.strength-text {
    font-weight: 600;
    font-size: 0.9rem;
    min-width: 80px;
    text-align: right;
}

/* Generator Options */
.generator-options {
    margin-bottom: 30px;
}

.option-group {
    margin-bottom: 25px;
}

.option-label {
    display: block;
    margin-bottom: 10px;
    font-weight: 500;
    color: var(--text-secondary);
}

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

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

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--gradient-primary);
    cursor: pointer;
    border: none;
}

.checkbox-group {
    display: grid;
    gap: 15px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    color: var(--text-secondary);
    transition: color 0.3s ease;
}

.checkbox-label:hover {
    color: var(--text-primary);
}

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

.checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    margin-right: 12px;
    position: relative;
    transition: all 0.3s ease;
}

.checkbox-label input[type="checkbox"]:checked + .checkmark {
    background: var(--gradient-primary);
    border-color: var(--primary-color);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-weight: bold;
    font-size: 12px;
}

/* Generate Button */
.generate-btn {
    width: 100%;
    padding: 18px;
    background: var(--gradient-primary);
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 20px;
}

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

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

/* Quick Actions */
.quick-actions {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

.quick-btn {
    padding: 10px 15px;
    background: var(--background-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
}

.quick-btn:hover {
    background: var(--background-tertiary);
    color: var(--text-primary);
    border-color: var(--primary-color);
}

/* Checker Section */
.checker-section {
    padding: 80px 0;
    background: var(--background-primary);
}

.checker-card {
    background: var(--background-secondary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 40px;
    box-shadow: var(--shadow-xl);
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.checker-card h2 {
    font-size: 2rem;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.checker-card p {
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.input-container {
    position: relative;
    margin-bottom: 20px;
}

.check-input {
    width: 100%;
    padding: 15px 50px 15px 20px;
    background: var(--background-primary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 1.1rem;
    transition: all 0.3s ease;
}

.check-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.toggle-visibility {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1.2rem;
    transition: color 0.3s ease;
}

.toggle-visibility:hover {
    color: var(--text-primary);
}

.strength-meter {
    margin-bottom: 20px;
}

.meter-bar {
    width: 100%;
    height: 10px;
    background: var(--background-primary);
    border-radius: 5px;
    overflow: hidden;
    margin-bottom: 10px;
}

.meter-fill {
    height: 100%;
    width: 0%;
    transition: all 0.5s ease;
    border-radius: 5px;
}

.meter-text {
    font-weight: 600;
    color: var(--text-secondary);
}

.criteria-list {
    display: grid;
    gap: 10px;
    text-align: left;
}

.criterion {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-muted);
    transition: color 0.3s ease;
}

.criterion.met {
    color: var(--secondary-color);
}

.criterion i {
    width: 16px;
}

.criterion.met i::before {
    content: '\f00c';
}

/* Tips Section */
.tips-section {
    padding: 80px 0;
    background: var(--background-secondary);
}

.tips-section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 50px;
    color: var(--text-primary);
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.tip-card {
    background: var(--background-primary);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    padding: 30px;
    text-align: center;
    transition: all 0.3s ease;
}

.tip-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.tip-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 1.5rem;
    color: white;
}

.tip-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--text-primary);
}

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

/* FAQ Section */
.faq-section {
    padding: 80px 0;
    background: var(--background-primary);
}

.faq-section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 50px;
    color: var(--text-primary);
}

.faq-grid {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border: 1px solid var(--border-color);
    border-radius: 12px;
    margin-bottom: 15px;
    overflow: hidden;
    background: var(--background-secondary);
}

.faq-question {
    padding: 20px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.3s ease;
}

.faq-question:hover {
    background: var(--background-tertiary);
}

.faq-question h3 {
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 500;
}

.faq-question i {
    color: var(--text-muted);
    transition: transform 0.3s ease;
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 200px;
}

.faq-answer p {
    padding: 0 20px 20px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* About Section */
.about-section {
    padding: 80px 0;
    background: var(--background-secondary);
    text-align: center;
}

.about-content h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.about-content p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 50px;
    line-height: 1.7;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.feature {
    background: var(--background-primary);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    padding: 30px;
    transition: all 0.3s ease;
}

.feature:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.feature i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.feature h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.feature p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.6;
}

/* Footer */
.footer {
    background: var(--background-primary);
    border-top: 1px solid var(--border-color);
    padding: 50px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 30px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.footer-section h4 {
    color: var(--text-primary);
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.footer-section p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 8px;
}

.footer-section ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: var(--primary-color);
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: var(--background-secondary);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
    text-align: center;
    color: var(--text-muted);
}

/* Strength Colors */
.strength-weak { background: var(--gradient-danger); }
.strength-fair { background: linear-gradient(135deg, #f59e0b, #d97706); }
.strength-good { background: linear-gradient(135deg, #10b981, #059669); }
.strength-strong { background: var(--gradient-secondary); }

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero p {
        font-size: 1.1rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 30px;
    }
    
    .nav {
        display: none;
    }
    
    .generator-card,
    .checker-card {
        padding: 25px;
        margin: 0 10px;
    }
    
    .tips-grid {
        grid-template-columns: 1fr;
    }
    
    .quick-actions {
        flex-direction: column;
    }
    
    .quick-btn {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 60px 0;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .generator-section,
    .checker-section,
    .tips-section,
    .about-section,
    .faq-section {
        padding: 50px 0;
    }
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.generator-card,
.checker-card {
    animation: fadeInUp 0.6s ease-out;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--background-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}