/* Video Çözüm Sayfası Stilleri */
.solution-navbar {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 30px;
    background: linear-gradient(to right, #f0f7f5, #f5f5f5);
    padding: 15px;
    border-radius: var(--border-radius);
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.05);
    position: relative;
    border-left: 4px solid var(--primary-color);
}

.nav-button {
    background-color: #fff;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    padding: 10px 18px;
    border-radius: 50px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    text-decoration: none;
}

.nav-button:hover {
    background-color: var(--primary-color);
    color: var(--light-text);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.nav-button:active {
    transform: translateY(0);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

.prev-solution:hover {
    transform: translateX(-5px);
}

.next-solution:hover {
    transform: translateX(5px);
}

.close-button {
    color: var(--secondary-color);
    border-color: var(--secondary-color);
}

.close-button:hover {
    background-color: var(--secondary-color);
    color: var(--light-text);
}

/* Kitap bilgisi */
.book-info {
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 1px solid #eee;
    position: relative;
}

.book-info::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 150px;
    height: 3px;
    background: linear-gradient(to right, var(--primary-color), transparent);
    border-radius: 1.5px;
}

.book-info h2 {
    color: var(--primary-dark);
    font-size: 24px;
    margin-bottom: 12px;
    font-weight: 700;
}

.problem-info {
    display: flex;
    gap: 25px;
    color: #666;
    font-size: 15px;
}

.problem-info span {
    position: relative;
    padding-left: 20px;
}

.problem-info span::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 10px;
    height: 10px;
    background-color: var(--primary-light);
    border-radius: 50%;
}

#problem-topic::before {
    background-color: var(--secondary-light);
}

/* Video Alanı */
.video-container {
    margin-bottom: 35px;
}

.video-player {
    width: 100%;
    background-color: #000;
    border-radius: 12px;
    overflow: hidden;
    position: relative;
    padding-top: 56.25%; /* 16:9 en-boy oranı */
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
    border: 3px solid #222;
}

.video-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(45deg, #111, #333);
    z-index: 1;
    cursor: pointer;
    transition: var(--transition);
}

.video-placeholder:hover {
    background: linear-gradient(45deg, #222, #444);
}

.video-placeholder i {
    font-size: 80px;
    color: var(--secondary-color);
    margin-bottom: 20px;
    filter: drop-shadow(0 2px 10px rgba(255, 111, 0, 0.5));
    transition: var(--transition);
}

.video-placeholder:hover i {
    transform: scale(1.1);
    color: var(--secondary-light);
}

.video-placeholder p {
    color: #fff;
    font-size: 18px;
    font-weight: 600;
    text-shadow: 0 2px 5px rgba(0, 0, 0, 0.5);
}

#solution-video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

/* Aksiyon Butonları */
.solution-actions {
    display: flex;
    justify-content: center;
    gap: 18px;
    margin-bottom: 35px;
    flex-wrap: wrap;
}

.action-button {
    background: linear-gradient(to right, var(--primary-color), var(--primary-dark));
    color: white;
    border: none;
    border-radius: 8px;
    padding: 14px 25px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
}

.action-button:hover {
    background: linear-gradient(to right, var(--primary-dark), var(--primary-color));
    transform: translateY(-3px);
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.15);
}

.action-button:active {
    transform: translateY(0);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.action-button::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: 0.5s;
}

.action-button:hover::after {
    left: 100%;
}

#play-video {
    background: linear-gradient(to right, var(--secondary-color), var(--secondary-dark));
}

#play-video:hover {
    background: linear-gradient(to right, var(--secondary-dark), var(--secondary-color));
}

/* Soru Detayları */
.problem-details {
    background-color: #f9f9f9;
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 35px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    border-left: 5px solid var(--primary-color);
    position: relative;
    overflow: hidden;
}

.problem-details::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 150px;
    height: 150px;
    background: linear-gradient(135deg, var(--primary-light), transparent);
    opacity: 0.1;
    border-radius: 0 0 0 150px;
}

.problem-image-container {
    margin-bottom: 25px;
    text-align: center;
}

#problem-image {
    max-width: 100%;
    max-height: 350px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    border: 1px solid #eee;
}

.problem-text {
    line-height: 1.8;
    font-size: 16px;
    color: #333;
}

.problem-text p {
    margin-bottom: 15px;
}

.problem-text p:first-of-type {
    font-weight: 600;
    color: var(--primary-dark);
}

/* Responsive */
@media (max-width: 768px) {
    .solution-navbar {
        padding: 12px;
    }
    
    .nav-button {
        padding: 8px 15px;
        font-size: 13px;
    }
    
    .book-info h2 {
        font-size: 22px;
    }
    
    .problem-info {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 15px;
    }
    
    .video-placeholder i {
        font-size: 60px;
    }
    
    .video-placeholder p {
        font-size: 16px;
    }
    
    .action-button {
        padding: 12px 20px;
        font-size: 14px;
    }
    
    .problem-details {
        padding: 20px;
    }
}

@media (max-width: 480px) {
    .solution-navbar {
        flex-direction: column;
    }
    
    .nav-button {
        width: 100%;
        justify-content: center;
    }
    
    .book-info h2 {
        font-size: 20px;
    }
    
    .problem-info {
        flex-direction: column;
        gap: 10px;
    }
    
    .solution-actions {
        flex-direction: column;
        gap: 12px;
    }
    
    .action-button {
        width: 100%;
        justify-content: center;
        padding: 12px;
    }
    
    .video-placeholder i {
        font-size: 50px;
    }
    
    .problem-text {
        font-size: 15px;
    }
}