:root {
    --primary-color: #12307c;       
    --secondary-color: #bfdbfe;     
    --accent-color: #2563eb;        
    --dark-color: #0f276a;          
    --light-color: #dbeafe;         
    --text-color: #0f172a;          
    --border-radius: 8px;
    --box-shadow: 0 4px 12px rgba(18, 48, 124, 0.25); 
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--light-color);
    color: var(--text-color);
    line-height: 1.6;
}

header {
    background-color: var(--light-color);
    box-shadow: var(--box-shadow);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
}

.baslık {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    display: inline-block;
    margin-right: 2rem;
}

.baslik-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.center-seçenekler, .right-seçenekler {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.baslik-nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s;
}

.baslik-nav a:hover {
    color: var(--primary-color);
}

button {
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s;
}

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

.btn-primary:hover {
    background-color: #0f276a;
    transform: translateY(-2px);
}

.oluştur {
    background-color: var(--accent-color);
    color: white;
}

.oluştur:hover {
    background-color: #1e40af;
    transform: translateY(-2px);
}

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

.btn-çıkış:hover {
    background-color: #0b1e52;
}

section {
    padding: 2rem;
    min-height: calc(100vh - 150px);
}

.section-kullanici {
    background-color: var(--light-color);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 2rem;
    text-align: center;
}

.section-kullanici h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.search-container {
    display: flex;
    max-width: 600px;
    margin: 0 auto;
}

.search-container input {
    flex: 1;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: var(--border-radius) 0 0 var(--border-radius);
    font-size: 1rem;
}

.search-container button {
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    padding: 0 1.5rem;
}

.section-anketler {
    background-color: var(--light-color);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.section-anketler h4 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--secondary-color);
}

.anket-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.anket-card {
    background-color: var(--secondary-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    transition: transform 0.3s, box-shadow 0.3s;
    border-left: 4px solid var(--primary-color);
}

.anket-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 16px rgba(18, 48, 124, 0.1);
}

.anket-card h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.anket-card p {
    color: #374151; 
    margin-bottom: 1rem;
}

.anket-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: #4b5563;
}

.no-anket {
    text-align: center;
    padding: 2rem;
    color: #4b5563;
}

.hero {
    background: linear-gradient(135deg, var(--primary-color), #2563eb);
    color: white;
    padding: 4rem 2rem;
    border-radius: var(--border-radius);
    text-align: center;
    margin-bottom: 2rem;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto 2rem;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    background-color: var(--light-color);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    text-align: center;
}

.feature-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.feature-card h3 {
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

footer {
    background-color: var(--dark-color);
    color: white;
    text-align: center;
    padding: 1.5rem;
    margin-top: 2rem;
}

@media (max-width: 900px) {
   header {
        display: flex;
        flex-direction: column;
   }
    .baslik-nav {
        flex-direction: column;
        gap: 1rem;
    }
    
    .center-seçenekler {
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
    }
    .right-seçenekler {
        width: 100%;
        justify-content: center;
    }
    .anket-list {
        grid-template-columns: 1fr;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
}

.faq-section {
    background-color: var(--light-color);
    padding: 2rem;
    margin-top: 3rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.faq-section h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    text-align: center;
}

.faq-section details {
    margin-bottom: 1rem;
    cursor: pointer;
    border-bottom: 1px solid #ddd;
    padding-bottom: 0.5rem;
}

.faq-section summary {
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-color);
}

.faq-section p {
    color: #555;
    margin-top: 0.5rem;
}