/* Reset ve Base Stilleri */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

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

/* Header */
.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 40px 0;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.header .subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Advertisement Section */
.ad-section {
    background-color: #fff;
    padding: 30px 0;
    border-top: 1px solid #e0e0e0;
    border-bottom: 1px solid #e0e0e0;
}

.ad-placeholder {
    background-color: #f0f0f0;
    border: 2px dashed #999;
    border-radius: 8px;
    padding: 30px;
    text-align: center;
    color: #666;
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 500;
    font-size: 0.9rem;
}

.ad-placeholder p {
    margin: 0;
}

/* Main Content */
main {
    background-color: #fff;
    padding: 40px 0;
    min-height: 500px;
}

.content-wrapper {
    display: grid;
    grid-template-columns: 1fr 250px;
    gap: 30px;
}

/* Sidebar */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.sidebar .ad-placeholder {
    min-height: 300px;
    padding: 20px;
}

/* Content */
.content {
    line-height: 1.8;
}

.content h2 {
    color: #667eea;
    font-size: 2rem;
    margin-bottom: 20px;
    border-bottom: 3px solid #667eea;
    padding-bottom: 10px;
}

.content h3 {
    color: #764ba2;
    font-size: 1.5rem;
    margin-top: 30px;
    margin-bottom: 15px;
}

.content p {
    margin-bottom: 15px;
    text-align: justify;
    color: #555;
}

.content ul {
    margin-left: 20px;
    margin-bottom: 15px;
}

.content li {
    margin-bottom: 8px;
    color: #555;
}

/* Footer */
.footer {
    background-color: #333;
    color: white;
    padding: 30px 0;
    text-align: center;
    margin-top: 20px;
}

.footer p {
    margin: 0;
    color: #ccc;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header h1 {
        font-size: 1.8rem;
    }

    .header .subtitle {
        font-size: 1rem;
    }

    .content-wrapper {
        grid-template-columns: 1fr;
    }

    .sidebar {
        grid-column: 1;
        order: 2;
    }

    .content {
        order: 1;
    }

    .content h2 {
        font-size: 1.5rem;
    }

    .content h3 {
        font-size: 1.2rem;
    }

    main {
        padding: 20px 0;
    }

    .ad-section {
        padding: 20px 0;
    }

    .ad-placeholder {
        min-height: 80px;
        padding: 20px;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.5rem;
    }

    .container {
        padding: 0 10px;
    }

    .header {
        padding: 20px 0;
    }

    .footer {
        padding: 20px 0;
    }
}