.content-header {
    background-color: #ffffff;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    margin-bottom: 25px;
}
.sidebar {
    background-color: #ffffff;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    margin-bottom: 20px;
}
.sidebar h5 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: #2d3748;
    position: relative;
    padding-bottom: 10px;
}
.sidebar h5::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 3px;
    background-color: #4f46e5;
}
.footer {
    border-top: 1px solid #e2e8f0;
    padding: 25px 0;
    text-align: center;
    margin-top: 40px;
    background-color: #f8fafc;
}

.test-header {
    background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
    color: #ffffff;
    text-align: center;
    padding: 20px;
    font-weight: 600;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
.test-card {
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    color: #ffffff;
    text-align: center;
    margin-bottom: 15px;
    padding: 20px;
    border-radius: 12px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
.test-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.test-card a {
    color: #ffffff;
    text-decoration: none;
    font-weight: 500;
}

.breadcrumb {
    background-color: transparent;
    margin-bottom: 20px;
    padding: 0;
}
.test-table th {
    font-weight: 600;
    color: #4f46e5;
    background-color: #f8fafc;
}
.test-button {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    color: #ffffff;
    font-weight: 600;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    transition: all 0.3s ease;
}
.test-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.question-timer {
    font-size: 1.5rem;
    font-weight: 600;
    color: white;
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    padding: 10px 20px;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
.option-btn {
    width: 100%;
    text-align: left;
    margin-bottom: 12px;
    font-weight: 500;
    padding: 15px 20px;
    border-radius: 8px;
    transition: all 0.3s ease;
    background-color: #f8fafc;
    border: 1px solid #e2e8f0;
}
.option-btn:hover {
    background-color: #000;
    transform: translateX(5px);
}
.correct {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%) !important;
    border: none;
    color: white;
}
.incorrect {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%) !important;
    border: none;
    color: white;
}



/* Modern Accordion Styles */
.accordion {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

/* Accordion Item Genel Stili */
.accordion-item {
    border: none;
    margin-bottom: 10px;
    border-radius: 12px !important;
    overflow: hidden;
    background-color: #ffffff;
}

/* Accordion Header (Buton) Stili */
.accordion-button {
    font-weight: 600;
    padding: 15px 25px;
    color: #ffffff !important;
    transition: all 0.3s ease;
}

.accordion-button:not(.collapsed) {
    color: #ffffff;
    box-shadow: none;
}

.accordion-button:focus {
    box-shadow: none;
    border-color: transparent;
}

.accordion-button::after {
    filter: brightness(0) invert(1);
}

/* Accordion Body Stili */
.accordion-body {
    padding: 0;
}

/* Liste Grubu Stili */
.list-group {
    border-radius: 0 !important;
}

.list-group-item {
    border: none;
    padding: 15px 25px;
    border-bottom: 1px solid #f1f5f9;
    transition: all 0.3s ease;
}

.list-group-item a {
    text-decoration: none;
    color: #4b5563;
    font-weight: 500;
    display: block;
    transition: all 0.3s ease;
}

.list-group-item:hover {
    background-color: #f8fafc;
    transform: translateX(5px);
}

.list-group-item:hover a {
    color: #4f46e5;
}

/* Her Sınıf için Özel Renkler */
.accordion-item:nth-child(1) .accordion-button { background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%); } /* 1. Sınıf */
.accordion-item:nth-child(2) .accordion-button { background: linear-gradient(135deg, #10b981 0%, #059669 100%); } /* 2. Sınıf */
.accordion-item:nth-child(3) .accordion-button { background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%); } /* 3. Sınıf */
.accordion-item:nth-child(4) .accordion-button { background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%); } /* 4. Sınıf */
.accordion-item:nth-child(5) .accordion-button { background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%); } /* 5. Sınıf */
.accordion-item:nth-child(6) .accordion-button { background: linear-gradient(135deg, #6b7280 0%, #4b5563 100%); } /* 6. Sınıf */
.accordion-item:nth-child(7) .accordion-button { background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%); } /* 7. Sınıf */
.accordion-item:nth-child(8) .accordion-button { background: linear-gradient(135deg, #ec4899 0%, #db2777 100%); } /* 8. Sınıf */
/* Daha fazla sınıf eklenirse renkler genişletilebilir */