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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica', 'Arial', sans-serif;
    line-height: 1.7;
    color: #333;
    background: #f5f7fa;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 2.5rem 2rem;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

header p {
    font-size: 1.1rem;
    opacity: 0.95;
    margin-bottom: 1rem;
}

.nav-link {
    display: inline-block;
    color: white;
    text-decoration: none;
    padding: 0.6rem 1.2rem;
    background: rgba(255,255,255,0.2);
    border-radius: 6px;
    margin-top: 1rem;
    transition: background 0.3s;
    font-weight: 500;
}

.nav-link:hover {
    background: rgba(255,255,255,0.3);
}

main {
    max-width: 900px;
    margin: 2rem auto;
    padding: 0 1.5rem 3rem;
}

.intro {
    background: white;
    padding: 2.5rem;
    border-radius: 10px;
    margin-bottom: 3rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    border-left: 4px solid #667eea;
}

.intro h2 {
    color: #667eea;
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
}

.intro p {
    margin-bottom: 1rem;
    font-size: 1.05rem;
}

.case-study {
    background: white;
    padding: 2.5rem;
    margin: 3rem 0;
    border-radius: 10px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.1);
}

.case-study > h2 {
    color: #667eea;
    font-size: 1.9rem;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 3px solid #667eea;
}

.case-section {
    margin: 2.5rem 0;
}

.case-section h3 {
    color: #764ba2;
    font-size: 1.4rem;
    margin-bottom: 1rem;
}

.case-section p {
    margin-bottom: 1rem;
    line-height: 1.8;
}

.case-section ul {
    margin-left: 1.5rem;
    margin-top: 1rem;
}

.case-section li {
    margin: 0.8rem 0;
    line-height: 1.7;
}

.highlight {
    background: linear-gradient(135deg, #fff3cd 0%, #ffe69c 100%);
    padding: 1.5rem;
    border-left: 5px solid #ffc107;
    border-radius: 6px;
    font-size: 1.15rem;
    font-weight: 500;
    color: #856404;
}

.note-box {
    background: #e7f3ff;
    padding: 1.2rem;
    border-left: 4px solid #2196F3;
    border-radius: 6px;
    margin-top: 1rem;
}

.note-box strong {
    color: #1976D2;
}

.results-box {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    margin: 2rem 0;
}

.result-item {
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-radius: 8px;
    border-left: 5px solid;
    background: white;
}

.result-item strong {
    display: block;
    font-size: 1.2rem;
    margin-bottom: 0.8rem;
}

.result-item .explanation {
    color: #666;
    font-size: 0.95rem;
    margin-top: 0.5rem;
    margin-bottom: 0;
}

.result-item.warning {
    border-color: #ffc107;
    background: #fffbf0;
}

.result-item.danger {
    border-color: #dc3545;
    background: #fff5f5;
}

.result-item.info {
    border-color: #17a2b8;
    background: #f0f9fa;
}

.screenshot-placeholder {
    background: #e9ecef;
    border: 2px dashed #adb5bd;
    padding: 3rem 2rem;
    text-align: center;
    border-radius: 8px;
    margin: 2rem 0;
    color: #6c757d;
    font-style: italic;
}

.result-image {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    margin: 1.5rem 0;
}

.cta-text {
    background: #e7f3ff;
    padding: 1.2rem;
    border-left: 4px solid #667eea;
    border-radius: 6px;
    margin-top: 2rem;
    font-size: 1.05rem;
}

.cta-text strong {
    color: #667eea;
}

.keywords-footer {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid #e9ecef;
    font-size: 0.9rem;
    color: #6c757d;
    font-style: italic;
}

.cta-button {
    display: inline-block;
    background: #667eea;
    color: white;
    padding: 1.2rem 2.5rem;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1.05rem;
    margin-top: 2rem;
    transition: all 0.3s;
}

.cta-button:hover {
    background: #5568d3;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.cta-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 3rem 2.5rem;
    border-radius: 10px;
    text-align: center;
    margin: 4rem 0 2rem;
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.3);
}

.cta-section h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.cta-section > p {
    font-size: 1.15rem;
    margin-bottom: 2rem;
    opacity: 0.95;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin: 2.5rem 0;
}

.feature {
    background: rgba(255,255,255,0.1);
    padding: 1.5rem;
    border-radius: 8px;
    backdrop-filter: blur(10px);
}

.feature h3 {
    font-size: 1.2rem;
    margin-bottom: 0.8rem;
}

.feature p {
    font-size: 0.95rem;
    opacity: 0.9;
}

.cta-button-large {
    display: inline-block;
    background: white;
    color: #667eea;
    padding: 1.3rem 3rem;
    text-decoration: none;
    border-radius: 8px;
    font-size: 1.3rem;
    font-weight: bold;
    margin-top: 1.5rem;
    transition: all 0.3s;
}

.cta-button-large:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(255,255,255,0.3);
}

footer {
    background: #2c3e50;
    color: white;
    text-align: center;
    padding: 2.5rem 2rem;
    margin-top: 4rem;
}

footer p {
    margin: 0.5rem 0;
}

footer a {
    color: #667eea;
    text-decoration: none;
    transition: color 0.3s;
}

footer a:hover {
    color: #8b9eea;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    main {
        padding: 0 1rem 2rem;
    }
    
    .intro {
        padding: 1.5rem;
    }
    
    .case-study {
        padding: 1.5rem;
    }
    
    .case-study > h2 {
        font-size: 1.5rem;
    }
    
    .case-section h3 {
        font-size: 1.2rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .cta-section {
        padding: 2rem 1.5rem;
    }
    
    .cta-section h2 {
        font-size: 1.5rem;
    }
    
    .cta-button-large {
        padding: 1rem 2rem;
        font-size: 1.1rem;
    }
}