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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #2d3748;
    background-color: #f7fafc;
    min-height: 100vh;
}

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

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

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: #2d3748;
    font-weight: 700;
    font-size: 1.25rem;
}

.nav {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    text-decoration: none;
    color: #4a5568;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    transition: all 0.2s;
}

.nav-link:hover,
.nav-link.active {
    color: #667eea;
    background-color: #f0f4ff;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: #4a5568;
    transition: all 0.3s;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Main Content */
.main {
    flex: 1;
    padding: 2rem 0;
}

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

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-description {
    font-size: 1.25rem;
    max-width: 800px;
    margin: 0 auto 2rem;
    opacity: 0.9;
    line-height: 1.7;
}

.hero-cta {
    margin-top: 2rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 0.75rem;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.2s;
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #e2e8f0;
    color: #4a5568;
}

.btn-secondary:hover {
    background: #cbd5e0;
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    color: #667eea;
    border-color: #667eea;
}

.btn-outline:hover {
    background: #667eea;
    color: white;
    transform: translateY(-1px);
}

/* Sections */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    color: #2d3748;
}

/* Tools Grid */
.tools-section {
    padding: 4rem 0;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.tool-card {
    background: white;
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    transition: all 0.3s;
    border: 1px solid #e2e8f0;
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.tool-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    color: white;
}

.tool-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: #2d3748;
}

.tool-description {
    color: #718096;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.tool-link {
    display: inline-flex;
    align-items: center;
    color: #667eea;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s;
}

.tool-link:hover {
    color: #764ba2;
    transform: translateX(5px);
}

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

.tool-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: #2d3748;
}

.tool-header .tool-description {
    font-size: 1.125rem;
    color: #718096;
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.7;
}

.tool-interface {
    background: white;
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    margin-bottom: 3rem;
}

.tool-controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    align-items: center;
}

.file-controls {
    display: flex;
    gap: 1rem;
    margin-left: auto;
}

/* Editor Styles */
.editor-container {
    display: grid;
    gap: 2rem;
}

.editor-section {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.editor-label {
    font-weight: 600;
    color: #4a5568;
    font-size: 1.125rem;
}

.json-editor,
.text-editor {
    width: 100%;
    min-height: 300px;
    padding: 1rem;
    border: 2px solid #e2e8f0;
    border-radius: 0.75rem;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    resize: vertical;
    transition: border-color 0.2s;
}

.json-editor:focus,
.text-editor:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.json-output {
    background: #f7fafc;
    border: 2px solid #e2e8f0;
    border-radius: 0.75rem;
    padding: 1rem;
    min-height: 300px;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    white-space: pre-wrap;
    overflow-x: auto;
    max-height: 500px;
    overflow-y: auto;
}

/* Validation Status */
.validation-status {
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.validation-status.valid {
    background: #f0fff4;
    color: #38a169;
    border: 1px solid #9ae6b4;
}

.validation-status.invalid {
    background: #fed7d7;
    color: #e53e3e;
    border: 1px solid #feb2b2;
}

/* Stats Container */
.stats-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: #f7fafc;
    border: 2px solid #e2e8f0;
    border-radius: 0.75rem;
    padding: 1.5rem;
    text-align: center;
    transition: all 0.2s;
}

.stat-card:hover {
    border-color: #667eea;
    transform: translateY(-2px);
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: #667eea;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.875rem;
    color: #718096;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Info Sections */
.info-section,
.features-section,
.about-section,
.faq-section {
    margin-bottom: 4rem;
}

.info-section h2,
.features-section h2,
.about-section h2,
.faq-section h2,
.faq-section h3 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 2rem;
    color: #2d3748;
}

.usage-steps {
    list-style: none;
    counter-reset: step-counter;
}

.usage-steps li {
    counter-increment: step-counter;
    margin-bottom: 1.5rem;
    padding-left: 3rem;
    position: relative;
}

.usage-steps li::before {
    content: counter(step-counter);
    position: absolute;
    left: 0;
    top: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    width: 2rem;
    height: 2rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.875rem;
}

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

.feature-item,
.faq-item {
    background: white;
    border-radius: 0.75rem;
    padding: 2rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    border: 1px solid #e2e8f0;
}

.feature-item h3,
.faq-item h4 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: #2d3748;
}

.feature-item p,
.faq-item p {
    color: #718096;
    line-height: 1.6;
}

.about-text {
    font-size: 1.125rem;
    color: #718096;
    line-height: 1.7;
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

/* Ad Placeholder */
.ad-placeholder {
    background: #f7fafc;
    border: 2px dashed #e2e8f0;
    border-radius: 0.5rem;
    padding: 2rem;
    text-align: center;
    color: #a0aec0;
    font-weight: 600;
    margin: 2rem 0;
}

/* Footer */
.footer {
    background: #2d3748;
    color: white;
    padding: 3rem 0 2rem;
    margin-top: 4rem;
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    align-items: center;
    text-align: center;
}

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

.footer-links a {
    color: #cbd5e0;
    text-decoration: none;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: white;
}

.footer-social {
    display: flex;
    gap: 1rem;
}

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: #4a5568;
    border-radius: 50%;
    color: #cbd5e0;
    transition: all 0.2s;
}

.footer-social a:hover {
    background: #667eea;
    color: white;
    transform: translateY(-2px);
}

.footer-copyright {
    color: #a0aec0;
    font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 0.75rem;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 1rem;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        transform: translateY(-20px);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s;
    }
    
    .nav.nav-open {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-description {
        font-size: 1.125rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
    }
    
    .tool-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .file-controls {
        margin-left: 0;
    }
    
    .stats-container {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-links {
        flex-direction: column;
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .stats-container {
        grid-template-columns: 1fr;
    }
    
    .features-grid,
    .faq-grid {
        grid-template-columns: 1fr;
    }
}

/* Syntax Highlighting for JSON */
.json-string { color: #22863a; }
.json-number { color: #005cc5; }
.json-boolean { color: #d73a49; }
.json-null { color: #6f42c1; }
.json-key { color: #032f62; font-weight: bold; }

/* Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Success/Error Messages */
.message {
    padding: 1rem;
    border-radius: 0.5rem;
    margin: 1rem 0;
    font-weight: 600;
}

.message.success {
    background: #f0fff4;
    color: #38a169;
    border: 1px solid #9ae6b4;
}

.message.error {
    background: #fed7d7;
    color: #e53e3e;
    border: 1px solid #feb2b2;
}

/* Accessibility Improvements */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Focus Styles */
button:focus,
input:focus,
textarea:focus,
select:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .header,
    .footer,
    .ad-placeholder,
    .tool-controls {
        display: none;
    }
    
    .main {
        padding: 0;
    }
    
    .tool-interface {
        box-shadow: none;
        border: 1px solid #ccc;
    }
}