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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8fafc;
}

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

/* Header */
.header {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: #2563eb;
}

.logo i {
    font-size: 2rem;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: #64748b;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: #2563eb;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.hero-content h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-content p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Generator Section */
.generator-section {
    padding: 4rem 0;
    background: white;
}

.generator-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.generator-form {
    background: #f8fafc;
    border-radius: 12px;
    padding: 1.5rem;
}

.generator-form h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: #1e293b;
}

.input-group {
    margin-bottom: 1.5rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #374151;
}

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

.length-control input[type="range"] {
    flex: 1;
    height: 6px;
    background: #e5e7eb;
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
}

.length-control input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    background: #2563eb;
    border-radius: 50%;
    cursor: pointer;
}

.length-control input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: #2563eb;
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

#length-display {
    font-weight: 600;
    color: #2563eb;
    min-width: 30px;
    text-align: center;
}

.options-group {
    margin-bottom: 1.5rem;
}

.options-group h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: #1e293b;
}

.checkbox-group {
    display: grid;
    gap: 0.75rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 6px;
    transition: background-color 0.3s ease;
}

.checkbox-label:hover {
    background-color: #e2e8f0;
}

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

.checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid #d1d5db;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    flex-shrink: 0;
}

.checkbox-label input[type="checkbox"]:checked + .checkmark {
    background: #2563eb;
    border-color: #2563eb;
}

.checkbox-label input[type="checkbox"]:checked + .checkmark::after {
    content: '✓';
    color: white;
    font-size: 12px;
    font-weight: bold;
}

.generate-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.generate-btn, .generate-multiple-btn {
    flex: 1;
    padding: 1rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.generate-btn {
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    color: white;
}

.generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(37, 99, 235, 0.3);
}

.generate-multiple-btn {
    background: #10b981;
    color: white;
}

.generate-multiple-btn:hover {
    background: #059669;
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(16, 185, 129, 0.3);
}

/* Result Section */
.result-section {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.result-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1e293b;
}

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

.copy-btn, .refresh-btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.copy-btn {
    background: #10b981;
    color: white;
}

.copy-btn:hover {
    background: #059669;
}

.refresh-btn {
    background: #6b7280;
    color: white;
}

.refresh-btn:hover {
    background: #4b5563;
}

.password-output {
    background: #f8fafc;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    padding: 1rem;
    min-height: 80px;
    font-family: 'Courier New', monospace;
    font-size: 1.25rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    word-break: break-all;
    text-align: center;
    margin-bottom: 1rem;
    transition: border-color 0.3s ease;
}

.password-output.has-password {
    border-color: #10b981;
    background: #f0fdf4;
    color: #166534;
}

.password-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 80px;
    color: #9ca3af;
    text-align: center;
}

.password-placeholder i {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.password-placeholder p {
    font-size: 0.875rem;
}

/* Password Strength */
.password-strength {
    margin-bottom: 1rem;
}

.strength-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: #374151;
    margin-bottom: 0.5rem;
}

.strength-meter {
    height: 8px;
    background: #e5e7eb;
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.strength-bar {
    height: 100%;
    width: 0%;
    transition: width 0.3s ease, background-color 0.3s ease;
    border-radius: 4px;
}

.strength-bar.very-weak { background: #ef4444; width: 20%; }
.strength-bar.weak { background: #f97316; width: 40%; }
.strength-bar.fair { background: #eab308; width: 60%; }
.strength-bar.good { background: #22c55e; width: 80%; }
.strength-bar.very-strong { background: #10b981; width: 100%; }

.strength-text {
    font-size: 0.875rem;
    font-weight: 500;
}

.strength-text.very-weak { color: #ef4444; }
.strength-text.weak { color: #f97316; }
.strength-text.fair { color: #eab308; }
.strength-text.good { color: #22c55e; }
.strength-text.very-strong { color: #10b981; }

/* Password Info */
.password-info {
    background: #f1f5f9;
    border-radius: 6px;
    padding: 1rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.info-label {
    font-size: 0.75rem;
    font-weight: 500;
    color: #64748b;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.info-value {
    font-size: 0.875rem;
    font-weight: 600;
    color: #1e293b;
}

/* Multiple Passwords Section */
.multiple-passwords-section {
    margin-top: 2rem;
    padding: 1.5rem;
    background: #f8fafc;
    border-radius: 12px;
}

.multiple-passwords-section h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #1e293b;
}

.multiple-passwords-list {
    display: grid;
    gap: 0.75rem;
}

.multiple-password-item {
    background: white;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: border-color 0.3s ease;
}

.multiple-password-item:hover {
    border-color: #2563eb;
}

.multiple-password-text {
    font-family: 'Courier New', monospace;
    font-size: 1rem;
    font-weight: 600;
    color: #1e293b;
    word-break: break-all;
    flex: 1;
    margin-right: 1rem;
}

.multiple-password-copy {
    padding: 0.5rem 1rem;
    background: #2563eb;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 0.875rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
    flex-shrink: 0;
}

.multiple-password-copy:hover {
    background: #1d4ed8;
}

/* Presets Section */
.presets-section {
    padding: 4rem 0;
    background: #f8fafc;
}

.presets-section h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    color: #1e293b;
}

.presets-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.preset-item {
    background: white;
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
    border: 2px solid transparent;
}

.preset-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    border-color: #2563eb;
}

.preset-item h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #1e293b;
}

.preset-item p {
    color: #64748b;
    margin-bottom: 0.75rem;
}

.preset-settings {
    font-size: 0.875rem;
    color: #2563eb;
    font-weight: 500;
}

/* Features Section */
.features {
    padding: 4rem 0;
    background: white;
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    color: #1e293b;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: #f8fafc;
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.feature-card i {
    font-size: 3rem;
    color: #2563eb;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #1e293b;
}

.feature-card p {
    color: #64748b;
    line-height: 1.6;
}

/* How It Works Section */
.how-it-works {
    padding: 4rem 0;
    background: #f8fafc;
}

.how-it-works h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    color: #1e293b;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.step {
    text-align: center;
    padding: 2rem;
}

.step-number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 1.5rem;
}

.step h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #1e293b;
}

.step p {
    color: #64748b;
    line-height: 1.6;
}

/* FAQ Section */
.faq {
    padding: 4rem 0;
    background: white;
}

.faq h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    color: #1e293b;
}

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

.faq-item {
    background: #f8fafc;
    border-radius: 8px;
    margin-bottom: 1rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.faq-question {
    padding: 1.5rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.3s ease;
}

.faq-question:hover {
    background-color: #e2e8f0;
}

.faq-question h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: #1e293b;
}

.faq-question i {
    color: #64748b;
    transition: transform 0.3s ease;
}

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

.faq-answer {
    padding: 0 1.5rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
    padding: 0 1.5rem 1.5rem;
    max-height: 200px;
}

.faq-answer p {
    color: #64748b;
    line-height: 1.6;
}

/* Footer */
.footer {
    background: #1e293b;
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #f1f5f9;
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: #94a3b8;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: #f1f5f9;
}

.footer-section p {
    color: #94a3b8;
    line-height: 1.6;
}

.footer-bottom {
    border-top: 1px solid #334155;
    padding-top: 1rem;
    text-align: center;
    color: #94a3b8;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .hero-content p {
        font-size: 1.1rem;
    }
    
    .generator-container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .generate-actions {
        flex-direction: column;
    }
    
    .password-info {
        grid-template-columns: 1fr;
    }
    
    .presets-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .steps {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 2rem 0;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .generator-section {
        padding: 2rem 0;
    }
    
    .features,
    .how-it-works,
    .faq {
        padding: 2rem 0;
    }
    
    .features h2,
    .how-it-works h2,
    .faq h2 {
        font-size: 2rem;
    }
    
    .result-header {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }
    
    .result-actions {
        justify-content: center;
    }
}

/* Animation for password generation */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.password-output.has-password {
    animation: fadeIn 0.3s ease-out;
}