:root {
    --primary: #2c3e50;
    --secondary: #3498db;
    --accent: #e74c3c;
    --light: #ecf0f1;
    --dark: #2c3e50;
    --text: #333;
    --text-light: #777;
}

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

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background-color: #f9f9f9;
    overflow-x: hidden;
}

h1 { font-size: clamp(2rem, 5vw, 2.8rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.2rem); }
h3 { font-size: clamp(1.5rem, 3.5vw, 1.8rem); }
h4 { font-size: clamp(1.25rem, 3vw, 1.5rem); }
p, li { font-size: clamp(1rem, 2.5vw, 1.1rem); }

.container {
    width: 92%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.5rem 0;
}

header {
    background: linear-gradient(135deg, var(--primary), var(--dark));
    color: white;
    padding: 2.5rem 0;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.navbar {
    background-color: var(--dark);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    color: white;
    font-weight: bold;
    font-size: clamp(1.2rem, 4vw, 1.5rem);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo i {
    font-size: 1.2em;
}

.menu-toggle {
    display: none;
    cursor: pointer;
    color: white;
    font-size: 1.5rem;
    background: none;
    border: none;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 1rem;
}

.nav-links a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.nav-links a:hover, .nav-links a.active {
    background-color: var(--secondary);
}

.btn {
    display: inline-block;
    background-color: var(--accent);
    color: white;
    padding: 0.8rem 1.5rem;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s ease;
    margin: 0.5rem 0;
    text-align: center;
    border: none;
    cursor: pointer;
    font-size: clamp(0.9rem, 2.5vw, 1rem);
}

.btn:hover {
    background-color: #c0392b;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.btn-block {
    display: block;
    width: 100%;
}

.btn-secondary {
    background-color: var(--secondary);
}

.btn-secondary:hover {
    background-color: #2980b9;
}

.feature-box {
    background-color: white;
    border-radius: 10px;
    padding: 1.8rem;
    margin: 1.5rem 0;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(300px, 100%), 1fr));
    gap: 1.5rem;
    margin: 1.5rem 0;
}

.feature-card {
    background-color: white;
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 4px 10px rgba(0,0,0,0.08);
    transition: all 0.3s ease;
    height: 100%;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.12);
}

.feature-card i {
    font-size: 2.2rem;
    color: var(--secondary);
    margin-bottom: 1rem;
}

.optimized-image {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    display: block;
    margin: 0 auto;
    transition: transform 0.3s ease;
}

.optimized-image:hover {
    transform: scale(1.02);
}

.small-image {
    max-width: 280px;
}

.medium-image {
    max-width: 500px;
}

.image-row {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
    margin: 1.5rem 0;
}

.img-container {
    margin: 1.5rem 0;
    text-align: center;
}

.img-caption {
    font-style: italic;
    margin-top: 0.5rem;
    color: var(--text-light);
    font-size: 0.9rem;
}

.step-box {
    background-color: #f8f9fa;
    border-radius: 8px;
    padding: 1.3rem 1.3rem 1.3rem 3.5rem;
    margin: 1.2rem 0;
    position: relative;
    counter-increment: step-counter;
}

.step-box::before {
    content: counter(step-counter);
    background-color: var(--secondary);
    color: white;
    font-weight: bold;
    width: 2rem;
    height: 2rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    left: 1rem;
    top: 1.3rem;
    font-size: 1rem;
}

.faq-item {
    margin-bottom: 1rem;
}

.faq-question {
    font-weight: 600;
    color: var(--primary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background-color: #f8f9fa;
    border-radius: 5px;
    transition: all 0.2s ease;
}

.faq-question:hover {
    background-color: #e9ecef;
}

.faq-answer {
    padding: 1rem;
    background-color: #f8f9fa;
    border-radius: 0 0 5px 5px;
    margin-top: 2px;
    display: none;
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    font-size: clamp(0.9rem, 2.5vw, 1rem);
}

.comparison-table th, 
.comparison-table td {
    padding: 0.8rem;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

.comparison-table th {
    background-color: var(--primary);
    color: white;
}

.comparison-table tr:nth-child(even) {
    background-color: #f2f2f2;
}

.warning-box {
    background-color: #fff3cd;
    border-left: 4px solid #ffc107;
    padding: 1rem;
    margin: 1rem 0;
    border-radius: 0 5px 5px 0;
}

.info-box {
    background-color: #e7f5ff;
    border-left: 4px solid #4dabf7;
    padding: 1rem;
    margin: 1rem 0;
    border-radius: 0 5px 5px 0;
}

.success-box {
    background-color: #ebfbee;
    border-left: 4px solid #40c057;
    padding: 1rem;
    margin: 1rem 0;
    border-radius: 0 5px 5px 0;
}

footer {
    background-color: var(--dark);
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: white;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--secondary);
}

.copyright {
    margin-top: 1.5rem;
    font-size: 0.9rem;
    color: rgba(255,255,255,0.7);
}

code {
    background-color: #f1f3f5;
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;
    font-size: 0.9em;
}

pre {
    background-color: #f8f9fa;
    padding: 1rem;
    border-radius: 5px;
    overflow-x: auto;
    margin: 1rem 0;
}

pre code {
    background-color: transparent;
    padding: 0;
    border-radius: 0;
}

@media (max-width: 1024px) {
    .container {
        width: 94%;
    }
    
    .nav-links {
        gap: 0.8rem;
    }
    
    .medium-image {
        max-width: 450px;
    }
}

@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }
    
    .nav-links {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        flex-direction: column;
        background-color: var(--dark);
        transition: all 0.3s ease;
        padding: 1rem 0;
        gap: 0;
    }
    
    .nav-links.active {
        left: 0;
    }
    
    .nav-links li {
        width: 100%;
        text-align: center;
    }
    
    .nav-links a {
        display: block;
        padding: 1rem;
        border-radius: 0;
    }
    
    .step-box {
        padding-left: 3rem;
    }
    
    .step-box::before {
        left: 0.8rem;
    }
    
    .image-row {
        flex-direction: column;
        align-items: center;
        gap: 15px;
    }
    
    .small-image {
        max-width: 250px;
    }
    
    .medium-image {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .container {
        width: 95%;
        padding: 1rem 0;
    }
    
    header {
        padding: 1.8rem 0;
    }
    
    .nav-container {
        padding: 0.6rem 1rem;
    }
    
    .feature-box {
        padding: 1.3rem;
    }
    
    .step-box {
        padding-left: 2.8rem;
    }
    
    .step-box::before {
        left: 0.6rem;
        width: 1.8rem;
        height: 1.8rem;
        font-size: 0.9rem;
    }
    
    .comparison-table {
        display: block;
        overflow-x: auto;
    }
    
    .small-image {
        max-width: 220px;
    }
}

@media (max-width: 360px) {
    html {
        font-size: 15px;
    }
    
    .btn {
        padding: 0.7rem 1.2rem;
    }
    
    .small-image {
        max-width: 200px;
    }
}

@media print {
    .navbar, .menu-toggle, footer {
        display: none;
    }
    
    body {
        background: white;
        color: black;
        font-size: 12pt;
    }
    
    .container {
        width: 100%;
        padding: 0;
    }
    
    .btn {
        display: none;
    }
    
    a::after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
        font-weight: normal;
    }
}