/* styles.css */
:root {
    --primary-color: #007BFF; /* Blue for trust and calls-to-action */
    --secondary-color: #6C757D; /* Gray for text and accents */
    --accent-color: #28A745; /* Green for highlights and success */
    --background-color: #FFFFFF; /* White for clean readability */
    --text-color: #333333; /* Dark gray for body text */
    --border-color: #E9ECEF; /* Light gray for borders */
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

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

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

.header {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
}

.nav-brand h1 {
    font-size: 1.5rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: white;
    text-decoration: none;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: var(--accent-color);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: white;
    margin: 3px 0;
    transition: 0.3s;
}

.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    max-width: 1200px;
    margin: 4rem auto;
    padding: 0 2rem;
    align-items: center;
}

.hero-content h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.hero-subtitle {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    color: var(--secondary-color);
}

.cta-btn {
    background: var(--accent-color);
    color: white;
    padding: 1rem 2rem;
    text-decoration: none;
    border-radius: 5px;
    transition: background 0.3s;
    display: inline-block;
}

.cta-btn:hover {
    background: #218838;
}

.hero-image img {
    width: 100%;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.toc {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 2rem;
    background: var(--border-color);
    border-radius: 10px;
    padding: 2rem;
}

.toc ul {
    list-style: none;
    columns: 2;
}

.toc a {
    color: var(--primary-color);
    text-decoration: none;
}

.toc a:hover {
    text-decoration: underline;
}

.section {
    max-width: 1200px;
    margin: 4rem auto;
    padding: 0 2rem;
}

.section h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 0.5rem;
}

.section p {
    margin-bottom: 1rem;
    text-align: justify;
}

blockquote {
    background: var(--border-color);
    padding: 1.5rem;
    border-left: 5px solid var(--accent-color);
    font-style: italic;
    margin: 2rem 0;
}

.image-grid, .gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1rem;
    margin: 2rem 0;
}


.ad-types-table, .comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    box-shadow: var(--shadow);
}

.ad-types-table th, .ad-types-table td,
.comparison-table th, .comparison-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

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

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

.stat-card {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    padding: 2rem;
    text-align: center;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.stat-card h3 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.checklist {
    background: var(--border-color);
    padding: 1.5rem;
    border-radius: 5px;
    margin: 2rem 0;
}

.checklist input[type="checkbox"] {
    margin-right: 0.5rem;
}

.footer {
    background: var(--secondary-color);
    color: white;
    text-align: center;
    padding: 2rem;
    margin-top: 4rem;
}

.footer a {
    color: var(--accent-color);
    text-decoration: none;
}

.full-width {
    width: 100%;
    text-align: center;
    margin-top: 2rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: var(--primary-color);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        padding: 2rem 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .toc ul {
        columns: 1;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .section {
        padding: 0 1rem;
    }

    .hero {
        padding: 0 1rem;
    }
}