/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro', 'Segoe UI', Roboto, sans-serif;
    background-color: #000000;
    color: #FFFFFF;
    overflow-x: hidden;
}

/* Page Layout */
.page {
    width: 100%;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* Header Block */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 160px;
    background-color: #000000;
}

.header__title {
    font-size: 45.18px;
    font-weight: 590;
    line-height: 1.19;
    color: #FFFFFF;
}

.header__logo {
    background-color: transparent;
    padding: 0;
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.header__logo:hover {
    transform: scale(1.05);
}

.header__logo-icon {
    width: 40px;
    height: 40px;
    display: block;
}

/* Main Content */
.main {
    flex: 1;
    padding: 0 160px 120px;
    margin-top: 0;
}

.content {
    display: flex;
    gap: 16px;
    max-width: 1600px;
    margin: 0 auto;
    position: relative;
    align-items: stretch;
    min-height: 600px;
}

/* Dashboard Layout */
.dashboard {
    display: flex;
    gap: 16px;
    max-width: 1600px;
    margin: 0 auto;
    width: 100%;
}

.dashboard__main {
    flex: 2;
    min-width: 0;
}

.dashboard__sidebar {
    flex: 1;
    max-width: 400px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.sidebar-content {
    width: 0;
    overflow: hidden;
    transition: all 0.3s ease;
    opacity: 0;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.sidebar-content--expanded {
    width: 30%;
    opacity: 1;
}

/* Video Card Block */
.video-card {
    background-color: #2E3136;
    border: 0.5px solid #EEEEEE;
    border-radius: 16px;
    overflow: hidden;
    flex: 1;
    max-width: 1013px;
    height: fit-content;
    min-height: 600px;
    transition: all 0.3s ease;
}

.content--sidebar-open .video-card {
    flex: 1;
    max-width: none;
}

.video-card__thumbnail {
    width: 100%;
    height: 400px;
    overflow: hidden;
    position: relative;
}

.video-card__image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.video-card__info {
    padding: 16px;
}

.video-card__title {
    font-size: 32px;
    font-weight: 590;
    line-height: 1.19;
    margin-bottom: 12px;
    color: #FFFFFF;
}

.video-card__description {
    font-size: 19.78px;
    font-weight: 400;
    line-height: 1.19;
    color: #FFFFFF;
    margin-bottom: 16px;
}

/* Video Card Categories */
.video-card__categories {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
    justify-content: flex-end;
}

.video-card__category {
    background-color: #7E9BA9;
    border: 0.5px solid #FFFFFF;
    border-radius: 8px;
    padding: 8px;
    font-size: 12.22px;
    font-weight: 400;
    line-height: 1.19;
    color: #FFFFFF;
}

/* Video Card Actions */
.video-card__actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.video-card__action {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 4px 8px;
    border-radius: 8px;
    border: 0.5px solid;
    background-color: #232E40;
    font-size: 12.22px;
    font-weight: 400;
    line-height: 1.19;
    color: #FFFFFF;
    cursor: pointer;
    transition: all 0.3s ease;
}

.video-card__action:hover {
    transform: translateY(-2px);
    opacity: 0.9;
}

.video-card__action--likes {
    border-color: rgba(255, 255, 255, 0.4);
    background-color: #2E3136;
}

.video-card__action--views {
    border-color: rgba(255, 255, 255, 0.4);
    background-color: #2E3136;
}

.video-card__action--summary {
    border-color: #1882FA;
}

.video-card__action--source {
    border-color: #1882FA;
}

.video-card__action--quiz {
    border-color: #1882FA;
}

.video-card__action--share {
    border-color: #0B9F1A;
}

.video-card__action-icon {
    width: 16px;
    height: 16px;
    color: #FFFFFF;
    transition: all 0.2s ease;
}

.video-card__action:hover .video-card__action-icon {
    transform: scale(1.1);
}

.video-card__action-text {
    white-space: nowrap;
}


/* Summary Card Block */
.summary-card {
    background-color: #2E3136;
    border: 0.5px solid #EEEEEE;
    border-radius: 24px;
    overflow: hidden;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    min-height: 600px;
}

.summary-card__header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 21px;
    background-color: #1E1E1E;
    border-radius: 3px;
    margin: 21px;
    margin-bottom: 0;
}

.summary-card__icon {
    width: 32px;
    height: 32px;
    color: #FFFFFF;
}

.summary-card__title {
    font-size: 21.73px;
    font-weight: 590;
    line-height: 1.19;
    color: #FFFFFF;
    margin: 0;
}

.summary-card__content {
    padding: 32px 21px 21px;
    display: flex;
    flex-direction: column;
    height: 100%;
    flex: 1;
}

.summary-card__text {
    font-size: 13.43px;
    font-weight: 400;
    line-height: 1.19;
    color: #FFFFFF;
    margin: 0;
    flex: 1;
}

/* Notes Card Styles */
.notes-card {
    background-color: #2C2C2C;
    border: 1px solid #87CEEB;
    border-radius: 8px;
    overflow: hidden;
    flex: 1;
    max-width: 1013px;
    height: fit-content;
    min-height: 600px;
    display: flex;
    flex-direction: column;
}

.notes-card__header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 16px 16px 8px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.notes-card__icon {
    width: 20px;
    height: 20px;
    color: #FFFFFF;
}

.notes-card__title {
    font-size: 18px;
    font-weight: 590;
    line-height: 1.19;
    color: #FFFFFF;
    margin: 0;
}

.notes-card__content {
    padding: 16px;
    display: flex;
    flex-direction: column;
    height: 100%;
    flex: 1;
}

.notes-card__text {
    font-size: 14px;
    font-weight: 400;
    line-height: 1.5;
    color: #FFFFFF;
    margin: 0;
    flex: 1;
}

.notes-card__textarea {
    width: 100%;
    min-height: 400px;
    padding: 0;
    margin: 0;
    border: none;
    outline: none;
    background: transparent;
    color: #FFFFFF;
    font-size: 14px;
    font-weight: 400;
    line-height: 1.5;
    font-family: inherit;
    resize: vertical;
    flex: 1;
    cursor: text;
    pointer-events: auto;
    user-select: text;
    -webkit-user-select: text;
    -moz-user-select: text;
    -ms-user-select: text;
}

.notes-card__textarea::placeholder {
    color: rgba(255, 255, 255, 0.5);
    font-style: italic;
}

.notes-card__textarea:focus {
    outline: none;
    border: none;
    background: rgba(255, 255, 255, 0.02);
}

.notes-card__textarea:hover {
    background: rgba(255, 255, 255, 0.01);
}

/* Quiz Card Styles */
.quiz-card {
    background-color: #2C2C2C;
    border: 1px solid #87CEEB;
    border-radius: 8px;
    overflow: hidden;
    flex: 1;
    max-width: 1013px;
    height: fit-content;
    min-height: 600px;
    display: flex;
    flex-direction: column;
}

.quiz-card__header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 16px 16px 8px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.quiz-card__icon {
    width: 20px;
    height: 20px;
    color: #FFFFFF;
}

.quiz-card__title {
    font-size: 18px;
    font-weight: 590;
    line-height: 1.19;
    color: #FFFFFF;
    margin: 0;
}

.quiz-card__content {
    padding: 16px;
    display: flex;
    flex-direction: column;
    height: 100%;
    flex: 1;
}

.quiz-card__question {
    font-size: 16px;
    font-weight: 500;
    line-height: 1.5;
    color: #FFFFFF;
    margin: 0 0 24px 0;
    flex: 0 0 auto;
}

.quiz-card__options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-bottom: 24px;
    flex: 0 0 auto;
    max-height: 300px;
    overflow-y: auto;
}

.quiz-card__option {
    padding: 12px 16px;
    background-color: #1E1E1E;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: #FFFFFF;
    font-size: 14px;
    font-weight: 400;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
    min-height: 48px;
    display: flex;
    align-items: center;
}

.quiz-card__option:hover {
    background-color: rgba(255, 255, 255, 0.05);
    border-color: #87CEEB;
}

.quiz-card__option:active {
    background-color: #87CEEB;
    color: #000000;
}

.quiz-card__navigation {
    display: flex;
    justify-content: space-between;
    gap: 8px;
    margin-top: auto;
    flex: 0 0 auto;
}

.quiz-card__nav {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px;
    background-color: #1E1E1E;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: #FFFFFF;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.quiz-card__nav:hover {
    background-color: rgba(255, 255, 255, 0.05);
    border-color: #87CEEB;
}

.quiz-card__nav-icon {
    width: 14px;
    height: 14px;
    color: #FFFFFF;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
}

.modal__content {
    background-color: #2C2C2C;
    border: 1px solid #87CEEB;
    border-radius: 8px;
    margin: 5% auto;
    padding: 0;
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow: hidden;
    position: relative;
    animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.modal__title-section {
    display: flex;
    align-items: center;
    gap: 8px;
}

.modal__icon {
    width: 20px;
    height: 20px;
    color: #FFFFFF;
}

.modal__title {
    font-size: 18px;
    font-weight: 590;
    color: #FFFFFF;
    margin: 0;
}

.modal__close {
    background: none;
    border: none;
    font-size: 24px;
    color: #FFFFFF;
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    transition: all 0.2s ease;
}

.modal__close:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.modal__body {
    padding: 20px;
    max-height: 60vh;
    overflow-y: auto;
}

/* Notes Modal Styles */
.notes-modal {
    background-color: #1A1A1A;
    border: 1px solid #87CEEB;
    border-radius: 8px;
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
}

.notes-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    background-color: #2C2C2C;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px 12px 0 0;
}

.notes-header__icon {
    width: 20px;
    height: 20px;
    color: #FFFFFF;
}

.notes-content {
    flex: 1;
    padding: 20px;
    display: flex;
    flex-direction: column;
    min-height: 300px;
}

.notes-title-section {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
}

.notes-title__icon {
    width: 18px;
    height: 18px;
    color: #FFFFFF;
}

.notes-title {
    font-size: 18px;
    font-weight: 590;
    color: #FFFFFF;
    margin: 0;
}

.notes-text {
    flex: 1;
    margin-bottom: 20px;
}

.notes-text__content {
    font-size: 14px;
    color: #FFFFFF;
    line-height: 1.5;
    margin: 0;
    text-align: left;
}

.notes-footer {
    padding: 16px;
    background-color: #2C2C2C;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 0 0 12px 12px;
}

.notes-footer__action {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    padding: 12px 16px;
    background-color: #1E1E1E;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
}

.notes-footer__action:hover {
    background-color: rgba(255, 255, 255, 0.05);
    transform: translateY(-1px);
}

.notes-footer__icon {
    width: 18px;
    height: 18px;
    color: #FFFFFF;
    flex-shrink: 0;
}

.notes-footer__text {
    font-size: 14px;
    font-weight: 400;
    color: #FFFFFF;
}

/* Quiz Modal Styles */
.quiz-content {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.quiz-question {
    font-size: 16px;
    font-weight: 400;
    line-height: 1.5;
    color: #FFFFFF;
    margin: 0;
}

.quiz-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.quiz-option {
    padding: 12px 16px;
    background-color: #1E1E1E;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: #FFFFFF;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
}

.quiz-option:hover {
    background-color: rgba(255, 255, 255, 0.05);
    border-color: #87CEEB;
}

.quiz-option:active {
    background-color: #87CEEB;
    color: #000000;
}

.quiz-navigation {
    display: flex;
    justify-content: space-between;
    gap: 16px;
}

.quiz-nav {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background-color: #1E1E1E;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: #FFFFFF;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.quiz-nav:hover {
    background-color: rgba(255, 255, 255, 0.05);
    border-color: #87CEEB;
}

.quiz-nav__icon {
    width: 16px;
    height: 16px;
    color: #FFFFFF;
}


/* Main Content Area */
.main-content {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
}

.content-card {
    background-color: #2E3136;
    border: 0.5px solid #EEEEEE;
    border-radius: 16px;
    overflow: hidden;
    flex: 1;
    min-height: 600px;
    display: flex;
    flex-direction: column;
    transition: all 0.3s ease;
}

.content-card__header {
    padding: 24px 24px 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.content-card__title {
    font-size: 32px;
    font-weight: 590;
    line-height: 1.19;
    color: #FFFFFF;
    margin: 0;
}

.content-card__body {
    padding: 24px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.content-card__text {
    font-size: 16px;
    font-weight: 400;
    line-height: 1.6;
    color: #FFFFFF;
    margin: 0;
    flex: 1;
}

/* Right Sidebar Block */
.right-sidebar {
    position: fixed;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    background-color: rgba(46, 49, 54, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: 80px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    z-index: 100;
}

.right-sidebar__item {
    width: 48px;
    height: 48px;
    background-color: rgba(30, 30, 30, 0.8);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.right-sidebar__item:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.right-sidebar__item--active {
    background: linear-gradient(135deg, #30CAA1 0%, #20A0FF 100%);
    box-shadow: 0 4px 16px rgba(48, 202, 161, 0.4);
    transform: translateY(-2px);
}

.right-sidebar__icon {
    width: 24px;
    height: 24px;
    color: #FFFFFF;
    transition: all 0.2s ease;
}

.right-sidebar__item:hover .right-sidebar__icon {
    transform: scale(1.1);
}

/* Navbar Block */
.navbar {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background-color: rgba(46, 49, 54, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 12px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
    width: 320px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.navbar__item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    transition: all 0.2s ease;
    min-width: 60px;
}

.navbar__item:hover {
    background-color: rgba(255, 255, 255, 0.05);
    transform: translateY(-1px);
}

.navbar__item--active {
    background: linear-gradient(135deg, #30CAA1 0%, #20A0FF 100%);
    box-shadow: 0 4px 16px rgba(48, 202, 161, 0.3);
}

.navbar__icon {
    width: 24px;
    height: 24px;
    color: #FFFFFF;
    transition: all 0.2s ease;
}

.navbar__item:hover .navbar__icon {
    transform: scale(1.1);
}

.navbar__text {
    font-size: 11px;
    font-weight: 500;
    color: #FFFFFF;
    text-align: center;
    line-height: 1.2;
}

/* Responsive Design */
@media screen and (max-width: 1440px) {
    .header {
        padding: 20px 80px;
    }
    
    .main {
        padding: 0 80px 120px;
    }
    
    
    .right-sidebar {
        right: 20px;
        width: 70px;
        padding: 12px;
    }
    
    .sidebar-content--expanded {
        width: 30%;
    }
    
    .content--sidebar-open .video-card {
        flex: 1;
        max-width: none;
    }
    
    .navbar {
        width: 300px;
        padding: 10px 16px;
    }
}

@media screen and (max-width: 1024px) {
    .header {
        padding: 16px 40px;
    }
    
    .header__title {
        font-size: 32px;
    }
    
    .header__logo-icon {
        width: 35px;
        height: 35px;
    }
    
    .main {
        padding: 0 40px 120px;
    }
    
    .content {
        flex-direction: column;
    }
    
    .dashboard {
        flex-direction: column;
    }
    
    .dashboard__sidebar {
        max-width: none;
    }
    
    
    .right-sidebar {
        position: fixed;
        bottom: 120px;
        right: 20px;
        flex-direction: column;
        width: 60px;
        padding: 12px;
        top: auto;
        transform: none;
    }
    
    .sidebar-content--expanded {
        width: 30%;
    }
    
    .content--sidebar-open .video-card {
        flex: 1;
        max-width: none;
    }
    
    
    .right-sidebar__item {
        width: 36px;
        height: 36px;
    }
    
    
    .right-sidebar__icon {
        width: 20px;
        height: 20px;
    }
    
    .navbar {
        width: 280px;
        padding: 8px;
    }
    
    .navbar__item {
        padding: 6px 8px;
        min-width: 50px;
    }
    
    .navbar__icon {
        width: 20px;
        height: 20px;
    }
    
    .navbar__text {
        font-size: 10px;
    }
}

@media screen and (max-width: 768px) {
    .header {
        padding: 12px 20px;
    }
    
    .header__title {
        font-size: 24px;
    }
    
    .header__logo-icon {
        width: 30px;
        height: 30px;
    }
    
    .main {
        padding: 0 20px 120px;
    }
    
    .dashboard__sidebar {
        flex-direction: column;
    }
    
    .video-card__thumbnail {
        height: 300px;
    }
    
    .video-card__title {
        font-size: 24px;
    }
    
    .video-card__description {
        font-size: 16px;
    }
    
    .video-card__categories {
        flex-wrap: wrap;
    }
    
    
    .right-sidebar {
        right: 10px;
        bottom: 100px;
        width: 50px;
        padding: 8px;
        top: auto;
        transform: none;
    }
    
    .sidebar-content--expanded {
        width: 30%;
    }
    
    .content--sidebar-open .video-card {
        flex: 1;
        max-width: none;
    }
    
    
    .right-sidebar__item {
        width: 34px;
        height: 34px;
    }
    
    
    .right-sidebar__icon {
        width: 18px;
        height: 18px;
    }
    
    .navbar {
        width: 260px;
        padding: 8px 10px;
    }
    
    .navbar__item {
        padding: 6px 8px;
        min-width: 45px;
    }
    
    .navbar__icon {
        width: 20px;
        height: 20px;
    }
    
    .navbar__text {
        font-size: 9px;
    }
}

@media screen and (max-width: 480px) {
    .header {
        flex-direction: column;
        gap: 8px;
        text-align: center;
        padding: 16px;
    }
    
    .header__logo-icon {
        width: 28px;
        height: 28px;
    }
    
    .main {
        padding: 0 20px 100px;
    }
    
    .video-card__thumbnail {
        height: 250px;
    }
    
    .video-card__actions {
        justify-content: center;
    }
    
    
    .right-sidebar {
        right: 5px;
        bottom: 80px;
        width: 45px;
        padding: 6px;
        top: auto;
        transform: none;
    }
    
    .sidebar-content--expanded {
        width: 30%;
    }
    
    .content--sidebar-open .video-card {
        flex: 1;
        max-width: none;
    }
    
    
    .right-sidebar__item {
        width: 32px;
        height: 32px;
    }
    
    
    .right-sidebar__icon {
        width: 16px;
        height: 16px;
    }
    
    .navbar {
        width: 240px;
        padding: 6px 8px;
    }
    
    .navbar__item {
        padding: 4px 6px;
        min-width: 40px;
    }
    
    .navbar__icon {
        width: 18px;
        height: 18px;
    }
    
    .navbar__text {
        font-size: 8px;
    }
}