/* Reset ve genel stiller */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

/* Header ve navigasyon */
header {
    background-color: #2c3e50;
    padding: 1rem 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

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

.logo {
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
}

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

.nav-links li {
    margin-left: 2rem;
}

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

.nav-links a:hover {
    color: #3498db;
}

.nav-links a.active {
    color: #3498db;
}

/* Ana içerik */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.hero {
    text-align: center;
    padding: 4rem 0;
    background-color: #f8f9fa;
    border-radius: 10px;
    margin-bottom: 3rem;
}

.hero h1 {
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    color: #666;
}

/* Özellik kartları */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
    text-align: center;
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-card h2 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

.feature-card p {
    color: #666;
    margin-bottom: 1.5rem;
}

.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    background-color: #3498db;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

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

/* Footer */
footer {
    background-color: #2c3e50;
    color: white;
    text-align: center;
    padding: 1.5rem 0;
    margin-top: 3rem;
}

/* Quiz sayfası stilleri */
.quiz-section {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
}

.quiz-container {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}

.question {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid #eee;
}

.question:last-child {
    border-bottom: none;
}

.options {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1rem;
}

.options label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.options label:hover {
    background-color: #f8f9fa;
}

.hidden {
    display: none;
}

/* Hakkımda sayfası stilleri */
.about-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

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

.about-card {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}

.about-card h2 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

.about-card h3 {
    color: #2c3e50;
    margin: 1.5rem 0 1rem;
}

.about-card ul {
    list-style-type: none;
    padding-left: 0;
}

.about-card ul li {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.about-card ul li:before {
    content: "•";
    color: #3498db;
    position: absolute;
    left: 0;
}

.contact-info li {
    margin-bottom: 1rem;
}

/* Dersler sayfası stilleri */
.courses {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

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

.course-card {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.course-card:hover {
    transform: translateY(-5px);
}

.course-topics {
    list-style-type: none;
    padding-left: 0;
    margin: 1rem 0;
}

.course-topics li {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.course-topics li:before {
    content: "✓";
    color: #3498db;
    position: absolute;
    left: 0;
}

/* Ders detay sayfası stilleri */
.course-detail {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.course-info {
    background: white;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
    padding: 2rem;
    margin-top: 2rem;
}

.course-overview {
    margin-bottom: 3rem;
}

.course-overview h2 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

.lesson-section {
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid #eee;
}

.lesson-section:last-child {
    border-bottom: none;
}

.lesson-section h3 {
    color: #2c3e50;
    margin-bottom: 1.5rem;
}

.video-container {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
}

.video-container h4 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

.video-link {
    display: block;
    color: #3498db;
    text-decoration: none;
    padding: 0.5rem 0;
    transition: color 0.3s ease;
}

.video-link:hover {
    color: #2980b9;
}

.practice-section {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
}

.practice-section h4 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

.practice-section ul {
    list-style-type: none;
    padding-left: 0;
}

.practice-section ul li {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.practice-section ul li:before {
    content: "✓";
    color: #3498db;
    position: absolute;
    left: 0;
}

.course-usage {
    margin-top: 3rem;
}

.course-usage h2 {
    color: #2c3e50;
    margin-bottom: 1.5rem;
}

.usage-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.usage-card {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    transition: transform 0.3s ease;
}

.usage-card:hover {
    transform: translateY(-5px);
}

.usage-card h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

/* Quiz sonuç stilleri */
.result-details {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 10px;
    margin: 1rem 0;
    text-align: center;
}

.result-details p {
    font-size: 1.2rem;
    margin: 0.5rem 0;
    color: #2c3e50;
}

#score, #percentage {
    font-weight: bold;
    color: #3498db;
}

.result-message {
    margin-top: 1.5rem;
    padding: 1rem;
    background: #fff;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

#result-text {
    font-size: 1.1rem;
    color: #2c3e50;
    font-weight: 500;
}

/* Quiz soru stilleri */
.question {
    background: #fff;
    padding: 1.5rem;
    border-radius: 10px;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.question h2 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

.options label {
    display: block;
    padding: 0.8rem;
    margin: 0.5rem 0;
    background: #f8f9fa;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.options label:hover {
    background: #e9ecef;
}

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

/* Responsive tasarım */
@media (max-width: 768px) {
    nav {
        flex-direction: column;
        text-align: center;
    }

    .nav-links {
        margin-top: 1rem;
    }

    .nav-links li {
        margin: 0 1rem;
    }

    .hero {
        padding: 2rem 1rem;
    }

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

    .course-detail {
        padding: 1rem;
    }

    .course-info {
        padding: 1rem;
    }

    .video-container,
    .practice-section {
        padding: 1rem;
    }
}