/* ===== CORTEX MAIN CSS ===== */
/* Global Styles and Variables */

:root {
    /* Material Design 3 Dark Theme */
    --primary-gradient: linear-gradient(135deg, #121212 0%, #1E1E1E 50%, #2A2A2A 100%);
    --secondary-gradient: linear-gradient(45deg, #121212, #1E1E1E);
    --bg-primary: #121212;
    --bg-secondary: #1E1E1E;
    --bg-tertiary: #2A2A2A;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.12);
    --glass-hover: rgba(255, 255, 255, 0.08);
    --text-primary: #E0E0E0;
    --text-secondary: #B0B0B0;
    --text-muted: #808080;
    --text-code: #B0B0B0;
    --text-color: #E0E0E0;
    --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
    --shadow-medium: 0 3px 6px rgba(0, 0, 0, 0.16), 0 3px 6px rgba(0, 0, 0, 0.23);
    --shadow-heavy: 0 10px 20px rgba(0, 0, 0, 0.19), 0 6px 6px rgba(0, 0, 0, 0.23);
    --border-radius: 12px;
    --border-radius-large: 20px;
    --border-radius-round: 50%;
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --sidebar-width: 280px;
    --sidebar-width-collapsed: 42px;
    --header-height: 80px;
    --accent-color: #BB86FC;
    --accent-hover: #D4A4FF;
    --success-color: #03DAC6;
    --warning-color: #FFB74D;
    --error-color: #CF6679;
    --code-bg: #1E1E1E;
    --code-border: #3A3A3A;
    --text-bold: #90CAF9;
    --border-color: rgba(255, 255, 255, 0.1);
    --elevation-1: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
    --elevation-2: 0 3px 6px rgba(0, 0, 0, 0.16), 0 3px 6px rgba(0, 0, 0, 0.23);
    --elevation-3: 0 10px 20px rgba(0, 0, 0, 0.19), 0 6px 6px rgba(0, 0, 0, 0.23);
    --elevation-4: 0 14px 28px rgba(0, 0, 0, 0.25), 0 10px 10px rgba(0, 0, 0, 0.22);
    --elevation-5: 0 19px 38px rgba(0, 0, 0, 0.30), 0 15px 12px rgba(0, 0, 0, 0.22);
}

/* ===== LAYOUT ===== */

/* Custom Topic Item Icons - Google Material Design Style */
.topic-menu-icon-img {
    width: 13.5rem;
    height: 13.5rem;
    object-fit: contain;
    transition: var(--transition);
    /* No color filter - icons are already colorful */
}

.topic-menu-card:hover .topic-menu-icon-img {
    transform: scale(1.1);
    /* Slight brightness boost on hover */
    filter: brightness(1.1);
}

/* Global HTML content styling */
.component-html-content b {
    color: var(--text-bold);
    font-weight: 600;
}

html, body {
    min-height: 100vh;
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--primary-gradient);
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
}

.cortex-layout {
    display: flex;
    min-height: 100vh;
    flex: 1;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    margin-left: var(--sidebar-width-collapsed);
    transition: var(--transition);
    position: relative;
    min-height: 100vh;
    background: var(--primary-gradient);
}

.site-footer {
    margin-top: auto;
    width: 100%;
    clear: both;
}

/* Special handling for topic pages with component menu */
.main-content .topic-layout {
    margin-left: 0;
}

.main-content.sidebar-expanded {
    margin-left: var(--sidebar-width);
}

/* ===== SIDEBAR ===== */

.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    min-width:42px;
    height: 100vh;
    max-height: 100vh;
    background: var(--bg-secondary);
    box-shadow: var(--elevation-2);
    z-index: 1000;

    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Prevent initial animation */
.sidebar.no-transition {
    transition: none!important;
}

.sidebar.collapsed {
    width: 42px;
    min-width:42px;
}

.sidebar-header {
    padding: 10px;
    border-bottom: 0px solid var(--glass-border);
    background: inherit;
    margin-bottom: 40px;
    flex-shrink: 0;
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-primary);
    font-size: 24px;
    font-weight: 600;
    justify-content: left;
}

.sidebar-logo i {
    font-size: 28px;
    color: var(--accent-color);
}

.sidebar-logo-img {
    width: 27px;
    height: 27px;
    object-fit: contain;
}

.sidebar-title {
    font-family: Lato, system-ui, -apple-system, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
    font-size: 20px;
    font-weight: 300;
    letter-spacing: 0.5px;

    color: var(--text-primary);

}

.sidebar.collapsed .sidebar-title,
.sidebar.collapsed .sidebar-text,
.sidebar.collapsed .user-info {
    display: none;
}

/* Hover effect for collapsed sidebar */
.sidebar.collapsed.hover-expanded {
    width: var(--sidebar-width);
    z-index: 1001;
    transition: width 0.3s ease;
}

.sidebar.collapsed.hover-expanded .sidebar-title,
.sidebar.collapsed.hover-expanded .sidebar-text,
.sidebar.collapsed.hover-expanded .user-info {
    display: block;
}

.sidebar.collapsed.hover-expanded .sidebar-logo {
    gap: 12px;
}

.sidebar.collapsed.hover-expanded .sidebar-link {
    gap: 15px;
}

.sidebar.collapsed.hover-expanded .sidebar-user {
    gap: 12px;
}

/* Click feedback for sidebar toggle */
.sidebar-toggle.clicked {
    transform: scale(0.95);
    transition: transform 0.2s ease;
}

.sidebar-toggle {
    transition: transform 0.2s ease;
}

/* Active state indicator */
.sidebar-link.active {
    position: relative;
    box-shadow: none;
}

.sidebar-link.active i {
    color: var(--accent-color);
}

.sidebar-nav{
    flex: 1;
    margin-top: 20px;
    overflow-y: auto;
    overflow-x: hidden;
    min-height: 0;
    /* Custom scrollbar styling */
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.3) transparent;
}

.sidebar-nav::-webkit-scrollbar {
    width: 6px;
}

.sidebar-nav::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar-nav::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.3);
    border-radius: 3px;
}

.sidebar-nav::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.5);
}

.sidebar-nav collapsed{
    flex: 1;
    padding: 20px 0;
    max-width:42px;
    width:42px;
    overflow: hidden;
}

.sidebar-menu {
    list-style: none;
    margin: 0;
    padding: 0;
}

.sidebar-item {
    margin: 0;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 13px 0px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    border-left: 3px solid transparent;
    position: relative;
    border-radius: 0 12px 12px 0;
    margin: 4px 8px;
    height:50px!important;
}

@media (max-height: 999px) {
    .sidebar-link {
        height: 40px !important;
    }
}

.sidebar-link:hover {
    background: var(--glass-hover);
    color: var(--text-primary);
    border-left-color: rgba(255, 255, 255, 0.3);
}

.sidebar-link.active {

    color: var(--text-primary);

}

.sidebar-link i {
    font-size: 16px;
    width: 20px;
    text-align: center;
}

.sidebar-text {
    font-size: 14px;
    font-weight: 500;
    white-space: nowrap;
}

/* ===== SUBMENU STYLES ===== */

.sidebar-item.has-submenu {
    position: relative;
}

.sidebar-submenu {
    position: absolute;
    left: 100%;
    top: 0;
    width: 250px;
    background: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    box-shadow: var(--elevation-3);
    opacity: 0;
    visibility: hidden;
    transform: translateX(-10px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1002;
    max-height: 400px;
    overflow-y: auto;
    backdrop-filter: blur(10px);
}

.sidebar-item.has-submenu:hover .sidebar-submenu {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

.submenu-header {
    padding: 12px 16px;
    border-bottom: 1px solid var(--glass-border);
    background: var(--bg-primary);
}

.submenu-title {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.submenu-loading {
    padding: 16px;
    text-align: center;
    color: var(--text-muted);
    font-size: 13px;
}

.submenu-loading i {
    margin-right: 8px;
    color: var(--accent-color);
}

.submenu-course-item {
    padding: 12px 16px;
    border-bottom: 1px solid var(--glass-border);
    transition: var(--transition);
    cursor: pointer;
}

.submenu-course-item:last-child {
    border-bottom: none;
}

.submenu-course-item:hover {
    background: var(--glass-hover);
}

.submenu-course-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.submenu-course-code {
    font-size: 12px;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.submenu-empty {
    padding: 20px 16px;
    text-align: center;
    color: var(--text-muted);
    font-size: 13px;
}

.submenu-empty i {
    font-size: 24px;
    margin-bottom: 8px;
    display: block;
    color: var(--text-muted);
}

/* Collapsed sidebar submenu positioning */
.sidebar.collapsed .sidebar-submenu {
    left: 47px;
}

.sidebar.collapsed.hover-expanded .sidebar-submenu {
    left: 100%;
}

.sidebar-footer {
    border-top: 1px solid var(--glass-border);
    flex-shrink: 0;
}

.sidebar-footer .sidebar-link {
    margin: 4px 8px;
    padding: 13px 0px;
    border-radius: 0 12px 12px 0;
    display: flex;
    align-items: center;
    gap: 15px;
}

.sidebar-user {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 15px;
}

.user-avatar {
    width: 40px;
    height: 40px;

    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    font-size: 16px;
}

.user-info {
    flex: 1;
}

.user-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.user-role {
    font-size: 12px;
    color: var(--text-muted);
}

.sidebar-actions {
    border-top: 1px solid var(--glass-border);
    padding-top: 15px;
    padding-left: 0;
    padding-right: 0;
}

.sidebar-actions .sidebar-link {
    margin: 4px 8px;
    padding: 13px 5px;
    border-radius: 0 12px 12px 0;
    display: flex;
    align-items: center;
    gap: 15px;
}

.sidebar-toggle {
    position: fixed;
    top: 20px;
    left: 20px;
    width: 45px;
    height: 45px;
    background: var(--sidebar-bg);
    border: none;
    border-radius: var(--border-radius);
    display: none !important;
    visibility: hidden !important;
    align-items: center;
    justify-content: center;
    color: transparent;
    cursor: pointer;
    z-index: 1001;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.sidebar-toggle:hover {
    background: var(--sidebar-bg);
    transform: scale(1.05);
}

.sidebar-toggle i {
    display: none;
}

.sidebar-toggle.hidden {
    display: none;
}

/* ===== CONVERSATION STYLES ===== */

.conversation-container {
    min-height: 100vh;
    position: relative;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
}

.page-header {
    padding: 40px 20px 20px 20px;
    text-align: center;
    color: var(--text-primary);
    position: relative;
}

.avatar {
    width: 120px;
    height: 120px;
    border-radius: var(--border-radius-round);
    background: transparent;
    border: 3px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 50px;
    color: var(--accent-color);
    margin: 0 auto 20px auto;
    cursor: pointer;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.avatar:hover {
    transform: scale(1.05);
    border-color: rgba(255, 255, 255, 0.6);
}

.avatar.recording {
    animation: recordingPulse 0.5s ease-in-out infinite;
    border-color: rgba(255, 71, 87, 0.8);
}

.avatar-listening {
    animation: listeningWave 1s ease-in-out infinite;
}

@keyframes avatarPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.02); }
}

@keyframes recordingPulse {
    0%, 100% { transform: scale(1); border-color: rgba(255, 71, 87, 0.8); }
    50% { transform: scale(1.1); border-color: rgba(255, 71, 87, 1); }
}

@keyframes listeningWave {
    0% { box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.7); }
    70% { box-shadow: 0 0 0 20px rgba(255, 255, 255, 0); }
    100% { box-shadow: 0 0 0 0 rgba(255, 255, 255, 0); }
}

.page-title {
    font-size: 2.5em;
    font-weight: 300;
    margin: 0 0 10px 0;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
    color: var(--accent-color);
}

.page-subtitle {
    font-size: 1.1em;
    opacity: 0.9;
    margin: 0;
    font-weight: 300;
    color: var(--text-primary);
}

/* Suggested Action Area */
.suggested-action-area {
    padding: 20px;
    text-align: center;
    display: none;
    animation: fadeInUp 0.4s ease-out;
}

.suggested-action-area.show {
    display: block;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.suggested-action-header {
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 500;
    margin-bottom: 15px;
    opacity: 0.9;
}

.suggested-action-button {
    background: rgba(255, 255, 255, 0.95);
    border: none;
    border-radius: 15px;
    padding: 20px 30px;
    color: #333;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-medium);
    display: inline-flex;
    align-items: center;
    gap: 12px;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.suggested-action-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.5s;
}

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

.suggested-action-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(0,0,0,0.3);
}

.suggested-action-button i {
    font-size: 20px;
}

.suggested-action-button .external-indicator {
    font-size: 14px;
    opacity: 0.6;
}

/* Conversation Area */
.conversation-area {
    flex: 1;
    padding: 20px;
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
    position: relative;
}

/* Subtle center background */
.conversation-area::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 600px;
    height: 100%;
    background: rgba(0, 0, 0, 0.1);
    border-radius: var(--border-radius-large);
    z-index: -1;
}

.conversation-messages {
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
}

.message {
    margin-bottom: 25px;
    padding: 0;
    max-width: 80%;
    word-wrap: break-word;
    animation: messageSlideIn 0.3s ease-out;
    position: relative;
    color: var(--text-primary);
    font-size: 16px;
    line-height: 1.6;
}

@keyframes messageSlideIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message.user {
    margin-left: auto;
    text-align: right;
}

.message.assistant {
    margin-right: auto;
    text-align: left;
}

.typing-indicator {
    display: none;
    padding: 15px 0;
    color: rgba(255, 255, 255, 0.7);
    font-style: italic;
    margin-bottom: 20px;
    animation: typingPulse 1.5s ease-in-out infinite;
}

@keyframes typingPulse {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

.typing-indicator.show {
    display: block;
}

/* Input Area */
.input-area {
    position: sticky;
    bottom: 0;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 20px;
    margin: 0 -20px -20px -20px;
}

.input-container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 15px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(125, 125, 125, 0.2);
    border-radius: 25px;
    padding: 8px;
    backdrop-filter: blur(10px);
    transition: var(--transition);
}

.input-container:focus-within {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(100, 100, 100, 0.3);
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.1);
}

.text-input {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    font-size: 16px;
    padding: 12px 20px;
    border-radius: 20px;
    color: var(--text-primary);
}

.text-input::placeholder {
    color: rgba(125, 125, 125, 0.6);
}

.voice-button {
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--border-radius-round);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    font-size: 16px;
    cursor: pointer;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.voice-button:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.voice-button.recording {
    background: rgba(255, 71, 87, 0.3);
    border-color: rgba(255, 71, 87, 0.6);
    animation: recordingPulse 0.5s ease-in-out infinite;
}

.send-button {
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--border-radius-round);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.send-button:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

/* Status Indicator */
.status-indicator {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 13px;
    color: var(--text-primary);
    backdrop-filter: blur(10px);
    z-index: 100;
}

/* Instructions */
.instructions {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255, 255, 255, 0.6);
    font-size: 13px;
    text-align: center;
    background: rgba(0, 0, 0, 0.2);
    padding: 8px 16px;
    border-radius: 20px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* AI Response Components */
.ai-response {
    display: flex;
    flex-direction: column;
}

.message-text {
    font-size: 16px;
    line-height: 1.6;
    margin-bottom: 10px;
}

.action-buttons {
    display: flex;
    gap: 10px;
    margin-top: 10px;
    flex-wrap: wrap;
}

.action-button {
    background: var(--bg-secondary);
    border: none;
    border-radius: var(--border-radius);
    padding: 12px 20px;
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    box-shadow: var(--elevation-1);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.action-button:hover {
    background: var(--glass-hover);
    box-shadow: var(--elevation-2);
    transform: translateY(-1px);
}

.topic-info, .course-info {
    margin-top: 5px;
    font-size: 12px;
    color: rgba(255, 255, 255, 0.8);
}

/* ===== TOPIC PAGE STYLES ===== */

.topic-container {
    padding: 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.topic-header {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-large);
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: var(--elevation-1);
}

.topic-title {
    font-size: 2.5em;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 10px 0;
}

.topic-description {
    font-size: 1.1em;
    color: var(--text-primary);
    line-height: 1.6;
    margin: 0;
}

.topic-meta {
    display: flex;
    gap: 20px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.topic-meta-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 14px;
}

.section {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-large);
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: var(--elevation-1);
}

.section-title {
    font-size: 1.5em;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 20px 0;
    display: flex;
    align-items: center;
    gap: 10px;
}

.component {
    background: var(--bg-tertiary);
    border: none;
    border-radius: var(--border-radius);
    padding: 20px;
    margin-bottom: 15px;
    transition: var(--transition);
}

.component:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-2px);
}

.component-title {
    font-size: 1.2em;
    font-weight: 600;
    color: var(--accent-color) !important;
    margin: 0 0 10px 0;
}

.component-header h2 {
    color: var(--accent-color) !important;
}

.component-content {
    color: var(--text-secondary);
    line-height: 1.6;
    max-width: 1000px;
}

#component-content {
    max-width: 1000px;
    margin:auto;
}

.quiz-section, .vocabulary-section {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-large);
    padding: 25px;
    margin-bottom: 25px;
    backdrop-filter: blur(10px);
}

.quiz-item, .vocabulary-item {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    padding: 15px;
    margin-bottom: 10px;
    transition: var(--transition);
}

.quiz-item:hover, .vocabulary-item:hover {
    background: rgba(255, 255, 255, 0.08);
}

/* ===== RESPONSIVE DESIGN ===== */

@media (max-width: 768px) {
    /* Hide sidebar toggle on mobile - not needed */
    .sidebar-toggle {
        display: none !important;
        visibility: hidden !important;
    }

    /* Mobile: Transform sidebar to horizontal top menu */
    /* Override all sidebar states on mobile to ensure full width */
    .sidebar.mobile-header-menu,
    .sidebar.mobile-header-menu.collapsed,
    .sidebar.mobile-header-menu.mobile-open,
    .sidebar.mobile-header-menu:not(.mobile-open),
    .sidebar,
    .sidebar.collapsed,
    .sidebar.mobile-open,
    .sidebar:not(.mobile-open) {
        position: fixed !important;
        top: 0 !important;
        left: 0 !important;
        right: 0 !important;
        width: 100vw !important;
        min-width: 100vw !important;
        max-width: 100vw !important;
        height: auto !important;
        min-height: auto !important;
        max-height: none !important;
        transform: translateX(0) !important;
        display: flex !important;
        flex-direction: row !important;
        align-items: center !important;
        justify-content: flex-start !important;
        padding: 0 !important;
        margin: 0 !important;
        z-index: 1000 !important;
        /* Background handled by dark.css for dark mode, light mode override below */
        box-shadow: var(--elevation-2) !important;
        border-bottom: 1px solid rgba(255, 255, 255, 0.2) !important;
        box-sizing: border-box !important;
    }

    .sidebar-header {
        display: flex !important; /* Show logo on mobile */
        align-items: center !important;
        padding: 8px 12px !important;
        flex-shrink: 0 !important;
        margin: 0 !important;
        margin-bottom: 0 !important;
    }

    .sidebar-header .sidebar-logo {
        gap: 0 !important; /* Remove gap between logo and text on mobile */
    }

    .sidebar-header .sidebar-title {
        display: none !important; /* Hide text, show only logo */
    }

    .sidebar-header .sidebar-logo-img {
        width: 32px !important;
        height: 32px !important;
    }

    .sidebar-nav,
    .sidebar.collapsed .sidebar-nav,
    .sidebar.mobile-open .sidebar-nav,
    .sidebar:not(.mobile-open) .sidebar-nav {
        flex: 1 !important;
        width: auto !important;
        min-width: 0 !important;
        max-width: none !important;
        margin: 0 !important;
        margin-top: 0 !important;
        overflow-x: auto !important;
        overflow-y: hidden !important;
        padding: 0 4px !important;
        display: flex !important;
        align-items: center !important;
        box-sizing: border-box !important;
    }

    .sidebar-menu,
    .sidebar.collapsed .sidebar-menu,
    .sidebar.mobile-open .sidebar-menu,
    .sidebar:not(.mobile-open) .sidebar-menu {
        display: flex !important;
        flex-direction: row !important;
        align-items: center !important;
        gap: 4px !important;
        margin: 0 !important;
        padding: 0 4px !important;
        list-style: none !important;
        width: auto !important;
        min-width: 0 !important;
        max-width: none !important;
        overflow-x: auto !important;
        -webkit-overflow-scrolling: touch !important;
        scrollbar-width: none !important; /* Firefox */
        box-sizing: border-box !important;
    }

    .sidebar-menu::-webkit-scrollbar {
        display: none; /* Chrome, Safari, Edge */
    }

    .sidebar-item {
        flex-shrink: 0;
        margin: 0;
    }

    .sidebar-link {
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 10px 12px;
        margin: 0;
        border-left: none;
        border-radius: var(--border-radius);
        min-width: 44px; /* Touch target size */
        height: 44px;
        gap: 0;
    }

    .sidebar-text {
        display: none; /* Hide text, show only icons */
    }

    .sidebar-link i {
        font-size: 18px;
        width: auto;
        margin: 0;
    }

    .sidebar-footer {
        display: flex !important; /* Show footer on mobile for logout/login */
        align-items: center !important;
        padding: 8px 12px !important;
        flex-shrink: 0 !important;
        margin: 0 !important;
        border-top: none !important;
    }

    .sidebar-footer .sidebar-menu {
        display: flex !important;
        flex-direction: row !important;
        align-items: center !important;
        gap: 4px !important;
        margin: 0 !important;
        padding: 0 !important;
        list-style: none !important;
    }

    .sidebar-footer .sidebar-link {
        display: flex !important;
        align-items: center !important;
        justify-content: center !important;
        padding: 10px 12px !important;
        margin: 0 !important;
        border-left: none !important;
        border-radius: var(--border-radius) !important;
        min-width: 44px !important;
        height: 44px !important;
        gap: 0 !important;
    }

    .sidebar-footer .sidebar-text {
        display: none !important; /* Hide text, show only icons */
    }

    .sidebar.mobile-open {
        transform: translateX(0) !important;
        width: 100vw !important;
        min-width: 100vw !important;
        max-width: 100vw !important;
    }

    /* Ensure full width even when sidebar is hidden/not mobile-open */
    .sidebar:not(.mobile-open) {
        width: 100vw !important;
        min-width: 100vw !important;
        max-width: 100vw !important;
        transform: translateX(0) !important;
    }

    /* Ensure full width on mobile - override any parent constraints */
    html, body {
        margin: 0;
        padding: 0;
        width: 100%;
        overflow-x: hidden;
    }

    .cortex-layout {
        width: 100%;
        margin: 0;
        padding: 0;
    }

    .main-content {
        margin-left: 0 !important;
        margin-top: 60px; /* Add top margin to account for sticky menu */
        width: 100%;
    }

    .sidebar-toggle {
        display: none !important; /* Hide toggle button on mobile */
        visibility: hidden !important;
    }

    /* Ensure cards display one per row on mobile */
    .units-grid {
        grid-template-columns: 1fr !important;
    }
    /* Ensure classes page also stays single column on mobile */
    .course-layout .units-grid {
        grid-template-columns: 1fr !important;
    }
    /* Force class page cards to single column on mobile */
    .ui.three.stackable.cards {
        display: block !important;
    }
    .ui.three.stackable.cards > .card {
        width: 100% !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
    }
    /* Class page: stack columns and table full width on mobile */
    .ui.grid > .nine.wide.column,
    .ui.grid > .seven.wide.column {
        width: 100% !important;
        margin: 0 !important;
        padding-left: 0 !important;
        padding-right: 0 !important;
    }
    .ui.grid {
        flex-direction: column !important;
    }
    .ui.grid .column {
        width: 100% !important;
    }
    /* Force students table to display as table on mobile (override Fomantic display: block !important) */
    #students-table {
        display: table !important;
        width: 100% !important;
        overflow-x: auto !important;
        table-layout: auto !important;
    }
    #students-table thead,
    #students-table tbody {
        display: table-row-group !important;
        width: 100% !important;
    }
    #students-table tr {
        display: table-row !important;
    }
    #students-table td,
    #students-table th {
        display: table-cell !important;
        white-space: nowrap !important;
    }
    /* Prevent Fomantic stackable tables from breaking rows on mobile */
    .ui.table {
        width: 100% !important;
        display: block !important;
        overflow-x: auto !important;
        table-layout: auto !important;
    }
    .ui.table thead,
    .ui.table tbody {
        display: table !important;
        width: 100% !important;
    }
    .ui.table tr {
        display: table-row !important;
    }
    .ui.table td,
    .ui.table th {
        display: table-cell !important;
        white-space: nowrap !important;
    }

    .page-header {
        padding: 30px 15px 15px 15px;
    }

    .avatar {
        width: 100px;
        height: 100px;
        font-size: 40px;
    }

    .page-title {
        font-size: 2em;
    }

    .conversation-area {
        padding: 15px;
    }

    .message {
        max-width: 90%;
    }

    .input-area {
        padding: 15px;
        margin: 0 -15px -15px -15px;
    }

    .topic-container {
        padding: 15px;
    }

    .topic-header {
        padding: 20px;
    }

    .topic-title {
        font-size: 2em;
    }

    /* Adjust course content padding for mobile */
    .course-content {
        padding-left: 20px !important;
        padding-top: 20px !important;
    }

    /* Set course-content-area left and right padding to zero on mobile */
    .course-content-area {
        padding-left: 0 !important;
        padding-right: 0 !important;
    }

    /* Hide breadcrumbs on mobile */
    .breadcrumb-nav,
    .breadcrumb-left,
    .breadcrumb-right {
        display: none !important;
    }

    /* Adjust topic content padding for mobile */
    .topic-content {
        padding-left: 5px !important;
        padding-right: 5px !important;
        padding-top: 20px !important;
    }

    /* Set component-body padding to zero on mobile */
    .component-body {
        padding-left: 0px !important;
        padding-right: 0px !important;
        padding-top: 0px !important;
    }

    /* Ensure topic-layout flows vertically on mobile */
    .topic-layout {
        display: flex !important;
        flex-direction: column !important;
        height: auto !important;
    }

    /* Component menu as standard page element below the fold on mobile */
    .component-menu {
        position: relative !important;
        width: 100% !important;
        max-width: 100% !important;
        height: auto !important;
        max-height: none !important;
        border-left: none !important;
        border-top: 1px solid rgba(255, 255, 255, 0.2) !important;
        border-radius: 0 !important;
        z-index: auto !important;
        box-shadow: none !important;
        transform: none !important;
        transition: none !important;
        padding-left: 0 !important;
        margin-top: 20px !important;
        order: 2 !important; /* Ensure it appears after content */
    }

    /* Ensure topic-content appears first */
    .topic-content {
        order: 1 !important;
    }

    .component-menu-items {
        max-height: none !important;
        overflow-y: visible !important;
        padding: 15px 15px 15px 0 !important; /* Remove left padding */
    }

    /* Remove left padding from component menu when faded */
    .component-menu.faded {
        padding-left: 0 !important;
    }

    /* Remove extra padding from topic-content bottom on mobile */
    .topic-content {
        padding-bottom: 20px !important;
    }

    /* Set component content area min-height on mobile */
    .component-content-area {
        min-height: 70vh !important;
    }

    /* Remove left padding from topic-detail-header on mobile */
    .topic-detail-header {
        padding-left: 0px !important;
    }

    /* Force footer to bottom of page on mobile */
    html, body {
        min-height: 100vh !important;
        display: flex !important;
        flex-direction: column !important;
    }

    .cortex-layout {
        flex: 1 !important;
        display: flex !important;
        flex-direction: column !important;
    }

    .main-content {
        flex: 1 !important;
        display: flex !important;
        flex-direction: column !important;
    }

    .site-footer {
        margin-top: auto !important;
        margin-bottom: 0 !important;
    }

    /* Prevent menu fade on mobile */
    .faded {
        opacity: 1 !important; /* Override fade effect on mobile */
    }

    .sidebar.faded,
    .breadcrumb-nav.faded,
    .component-menu.faded,
    .sidebar-toggle.faded,
    .study-agent-with-nav.faded {
        opacity: 1 !important; /* Keep menus visible on mobile */
    }

    /* Component images full width and center aligned on mobile */
    .component-image {
        width: 100% !important;
        max-height: 300px !important;
        height: 300px !important;
        overflow: hidden !important;
        float: none !important;
        margin-left: 0px !important;
        margin-right: 0 !important;
        margin-bottom: 20px !important;
        display: block !important;
        text-align: center !important;
    }

    .component-image img {
        width: 100% !important;
        height: 100% !important;
        object-fit: cover !important;
        margin: 0 auto !important;
        margin-left: 0 !important;
        display: block !important;
    }

    /* Component header margin on mobile */
    .component-header {
        margin-bottom: 20px !important;
    }

    /* Cloze question padding on mobile */
    .question.cloze {
        padding: 5px !important;
    }

    /* Spot the lie wrapper max-width on mobile */
    .answer-button-spot-lie-wrapper {
        max-width: 100vw !important;
    }

    /* Spot the lie button font size on mobile */
    .spot-lie-button {
        font-size: 18px !important;
    }

    /* Force component-image margin-left to 0 on mobile - must override desktop rule */
    .component-image,
    .component-body .component-image,
    .component-content-area .component-image {
        margin-left: 0px !important;
    }

    /* Hide Python menu icon on mobile - only in main nav, not footer */
    .sidebar-nav .sidebar-item:has(a[href*="python_challenges"]),
    .sidebar-nav .sidebar-menu .sidebar-item:nth-child(2) {
        display: none !important;
    }

    /* Mobile: keep only logo, classes/courses, and login/logout links */
    .sidebar-nav .sidebar-item {
        display: none !important;
    }
    .sidebar-nav .sidebar-item.mobile-keep {
        display: block !important;
    }
    .sidebar-footer .sidebar-item {
        display: none !important;
    }
    .sidebar-footer .sidebar-item.mobile-keep {
        display: block !important;
    }

    /* Light mode override for mobile menu - placed at end to ensure it overrides */
    /* Use the mobile-header-menu class for maximum specificity */
    body[data-theme="light"] .sidebar.mobile-header-menu,
    body[data-theme="light"] .sidebar.mobile-header-menu.collapsed,
    body[data-theme="light"] .sidebar.mobile-header-menu.mobile-open,
    body[data-theme="light"] .sidebar.mobile-header-menu:not(.mobile-open),
    body[data-theme="light"] #sidebar.mobile-header-menu,
    body[data-theme="light"] #sidebar.mobile-header-menu.collapsed,
    body[data-theme="light"] #sidebar.mobile-header-menu.mobile-open,
    body[data-theme="light"] #sidebar.mobile-header-menu:not(.mobile-open) {
        background: #8abdd0 !important; /* Blue background for light mode mobile header */
    }
}
}

@media (min-width: 769px) {
    .sidebar-toggle {
        display: flex;
        position: fixed;
        left: 10px;
        top: 50%;
        transform: translateY(-50%);
        z-index: 999;
        background: var(--sidebar-bg);
        border: none;
        border-radius: var(--border-radius);
        padding: 10px;
        color: transparent;
        cursor: pointer;
        backdrop-filter: blur(10px);
        transition: var(--transition);
    }

    .sidebar-toggle:hover {
        background: var(--sidebar-bg);
        transform: translateY(-50%) scale(1.1);
    }

    .sidebar-toggle i {
        display: none;
    }
}

/* ===== MULTIPLE CHOICE QUESTION STYLES ===== */

.question.multiple-choice {
    background: transparent;
    border: none;
    padding: 20px 0;
    margin: 20px 0;
    max-width: 1000px;
}

.multiple-choice-options {
    display: block;
    margin-top: 20px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.answer-button-mpc-wrapper {
    width: 100%;
    max-width: none;
    display: block;
    margin: 1px 0;
}

.answer-button.mpc-button {
    width: 100%;
    padding: 4px 0;
    border: none;
    border-radius: 0;
    background: transparent;
    color: var(--text-primary);
    font-size: 16px;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
    white-space: normal;
    line-height: 1.3;
    list-style: none;
    margin: 2px 0;
}

.answer-button.mpc-button:hover {
    background: transparent;
    transform: none;
    box-shadow: none;
    color: var(--accent-color);
}

.answer-button.mpc-button.correct {
    background-color: rgba(74, 222, 128, 0.3);

}

.answer-button.mpc-button.incorrect {
    background-color: rgba(248, 113, 113, 0.3);
}

.answer-button.mpc-button:disabled {
    opacity: 1;
    cursor: not-allowed;
    transform: none;
}

/* Override any grid layouts for multiple choice questions */
[style*="grid-template-columns"],
[style*="display: grid"],
.ui.four.column.grid,
.ui.stackable.four.column.grid {
    display: block !important;
    grid-template-columns: none !important;
}

[style*="grid-template-columns"] > *,
[style*="display: grid"] > *,
.ui.four.column.grid > *,
.ui.stackable.four.column.grid > * {
    display: block !important;
    width: 100% !important;
    margin: 4px 0 !important;
}

/* ===== WORD SORT QUESTION STYLES ===== */

.word-sort-container {
    margin: 0 auto;
    padding: 20px;
}

.word-sort-question {
    margin-bottom: 20px;
    text-align: center;
}

.word-sort-keyword {
    font-size: 1.5em;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.word-sort-instructions {
    color: var(--text-secondary);
    font-size: 1.1em;
    margin-bottom: 20px;
}

.word-sort-answer-area {
    min-height: 80px;
    border: 2px dashed var(--glass-border);
    border-radius: var(--border-radius);
    padding: 15px;
    margin-bottom: 20px;
    background: var(--bg-secondary);
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
}

.word-sort-answer-area.correct {
    border-color: var(--success-color);
    background: rgba(16, 185, 129, 0.1);
}

.word-sort-answer-area.incorrect {
    border-color: var(--error-color);
    background: rgba(239, 68, 68, 0.1);
}

.word-sort-placeholder {
    color: var(--text-muted);
    font-style: italic;
    width: 100%;
    text-align: center;
}

.word-sort-word-pile {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-bottom: 20px;
}

.word-sort-word {
    background: none;
    color: var(--accent-color);
    border: 1px solid var(--accent-color);
    padding: 8px 16px;
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    ont-size: 18px;
    cursor: pointer;
    transition: var(--transition);
    user-select: none;
}

.word-sort-word:hover {
    background: var(--glass-hover);
    border-color: var(--accent-color);
    transform: translateY(-1px);
}

.word-sort-answer-word {
    background: transparent;
    border: 1px solid var(--accent-color);
    border-radius: var(--border-radius);
    padding: 8px 16px;
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
    user-select: none;
}

.word-sort-answer-word:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

/* New fill-in-the-blanks styling */
.word-sort-word-choices {
    display: flex;
    flex-wrap: wrap;
    gap: 2px;
    justify-content: center;
    margin-bottom: 20px;
    padding: 0px;
    background: transparent;
    border-radius: 0px;
    border: none;
}

.word-sort-word.selected {
    background: var(--accent-color);
    color: var(--bg-primary);
    border-color: var(--accent-color);
}

.word-sort-phrase {
    font-size: 18px;
    line-height: 1.6;
    text-align: center;
    padding: 20px;
    background: rgba(255, 255, 255, 0.02);
    border-radius: var(--border-radius);
    border: 1px solid rgba(255, 255, 255, 0.05);
    margin-bottom: 20px;
}

.word-sort-phrase.correct {
    border-color: var(--success-color);
    background: rgba(16, 185, 129, 0.2);
    color: var(--success-color);
}

.word-sort-phrase.incorrect {
    border-color: var(--error-color);
    background: rgba(239, 68, 68, 0.2);
    color: var(--error-color);
}

.word-sort-blank {
    display: inline-block;
    min-width: 10px;
    padding: 4px 8px;
    margin: 0 4px;
    border-radius: 6px;
    transition: var(--transition);
    color: var(--text-muted);
    font-style: italic;
}

.word-sort-word-choices .word-sort-word {
    margin-right: 10px;
}

.word-sort-blank.filled {
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-style: normal;
    cursor: default;

}

.filled-word {
    background: none;
    color: var(--accent-color);
    padding: 2px 6px;
    border-radius: 0px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.filled-word:hover {
    background: var(--accent-hover);
    transform: scale(1.05);
}

.word-sort-feedback {
    margin-top: 15px;
    padding: 10px;
    border-radius: var(--border-radius);
    text-align: center;
}

.word-sort-feedback .feedback-message.success {
    color: var(--success-color);
}

.word-sort-feedback .feedback-message.error {
    color: var(--error-color);
}

/* ===== CLOZE QUESTION STYLES ===== */

.question.cloze {
    background: transparent;
    border: none;
    padding: 20px 0;
    margin: 20px 0;

    line-height: 1.5;
    max-width: 1000px;
}

.question.cloze input {
    height: 30px;
    background-color: rgba(from var(--accent-color) r g b / 0.1);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    padding: 5px 10px;
    color: var(--text-primary);
    margin: 0 5px;
    transition: var(--transition);
    text-align: center;
}

.question.cloze input:focus {
    outline: none;
    border-color: var(--accent-color);
    background-color: rgba(255, 255, 255, 0.15);
}

.question.cloze input.correct {
    background-color: rgba(34, 197, 94, 0.2) !important;
    border-color: #22c55e;
    color: #22c55e;
}

.question.cloze input.incorrect {
    background-color: rgba(239, 68, 68, 0.2) !important;
    border-color: #ef4444;
    color: #ef4444;
}

.scrambled {
    color: var(--text-muted);
    margin: 20px 0;
    padding: 10px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius);
    border: 1px solid var(--glass-border);
    font-style: italic;
}

.scrambled.hidden {
    display: none;
}

.cloze-feedback {
    margin-top: 20px;
    padding: 15px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius);
    border: 1px solid var(--glass-border);
}

.cloze-text {
    color: var(--text-primary);
    font-size: 16px;
    line-height: 1.6;
    margin-bottom: 20px;
}

.cloze-text input {
    display: inline-block;
    min-width: 80px;
}

.show-answer-button {
    transition: opacity 0.3s ease, background-color 0.3s ease;
}

.show-answer-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background: rgba(74, 158, 255, 0.3) !important;
}

.show-answer-button:disabled:hover {
    background: rgba(74, 158, 255, 0.3) !important;
    transform: none;
}

/* ===== WORD SORT QUESTION STYLES ===== */

.question.word-sort {
    background: transparent;
    border: none;
    padding: 20px 0;
    margin: 20px 0;
    min-height: 300px;
    line-height: 1.5;
    max-width: 1000px;
}

.word-sort-container {
    color: var(--text-primary);
    font-size: 16px;
    line-height: 1.6;
    margin-bottom: 20px;
}

.word-sort-item {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
    padding: 10px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.word-sort-item:hover {
    background: rgba(255, 255, 255, 0.1);
}

.word-sort-keyword {
    font-weight: 600;
    color: var(--text-primary);
    min-width: 150px;
}

.word-sort-definition {
    flex: 1;
    color: var(--text-secondary);
}

.word-sort-input {
    width: 100%;
    height: 30px;
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    padding: 5px 10px;
    color: var(--text-primary);
    margin-top: 5px;
    transition: var(--transition);
}

.word-sort-input:focus {
    outline: none;
    border-color: var(--accent-color);
    background-color: rgba(255, 255, 255, 0.15);
}

.word-sort-input.correct {
    background-color: rgba(34, 197, 94, 0.2) !important;
    border-color: #22c55e;
    color: #22c55e;
}

.word-sort-input.incorrect {
    background-color: rgba(239, 68, 68, 0.2) !important;
    border-color: #ef4444;
    color: #ef4444;
}

.word-sort-feedback {
    margin-top: 20px;
    padding: 15px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius);
    border: 1px solid var(--glass-border);
}

/* ===== STUDY ASSISTANT STYLES ===== */

.study-assistant {
    margin-top: 20px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 24px;
    backdrop-filter: blur(20px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
    overflow: hidden;
    max-width: 1000px;
}

/* Study Assistant Trigger */
.study-assistant-trigger {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 60px;
    height: 60px;
    background: rgba(107, 114, 128, 0.1);
    border: 2px solid rgba(107, 114, 128, 0.3);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
    margin: 20px auto;
}

.study-assistant-trigger:hover {
    background: rgba(107, 114, 128, 0.2);
    border-color: rgba(107, 114, 128, 0.5);
    transform: scale(1.05);
}

.study-assistant-trigger i {
    font-size: 24px;
    color: var(--accent-color);
}

/* Assistant Container - Centers the assistant under questions */
.assistant-container {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    margin: 30px 0;
    padding: 0 20px;
    box-sizing: border-box;
}

/* Global Study Assistant - MUST STAY BELOW COMPONENT CONTENT, NEVER MOVE TO SIDEBAR OR FIXED POSITION */
.global-study-assistant {
    width: 100%;
    max-width: 800px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 24px;
    backdrop-filter: blur(20px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    box-sizing: border-box;
    display: block;
    position: static;
    float: none;
    text-align: center;
}

.global-study-assistant.minimized {
    height: auto;
}

.global-study-assistant.minimized .assistant-content {
    display: none;
}

.study-assistant.minimized .assistant-content {
    display: none;
}

.study-assistant.minimized .assistant-header {
    border-bottom: none;
}

/* Hide question when assistant is active */
.study-assistant:not(.minimized) ~ .question {
    display: none;
}

.assistant-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: none;
    background: rgba(255, 255, 255, 0.02);
    cursor: pointer;
    width: 100%;
}

.assistant-title {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 13px;
    cursor: pointer;
    transition: transform 0.2s ease;
    width: 100%;
    text-align: center;
}

.assistant-title:hover {
    transform: scale(1.1);
}

.assistant-title i {
    color: var(--accent-color);
    font-size: 36px;
}

.assistant-title i.recording {
    color: #ef4444;
    animation: pulse 1.5s infinite;
}

.assistant-toggle {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.assistant-toggle:hover {
    background: var(--glass-hover);
    color: var(--text-primary);
}

.assistant-content {
    max-height: 300px;
    display: flex;
    flex-direction: column;
    width: 100%;
}

.assistant-messages {
    flex: 1;
    overflow-y: auto;
    padding: 12px;
    max-height: 200px;
}

.assistant-message {
    margin-bottom: 12px;
    display: flex;
    flex-direction: column;
}

.bot-message {
    align-items: flex-start;
}

.user-message {
    align-items: flex-end;
}

.message-content {
    max-width: 85%;
    padding: 8px 12px;
    border-radius: var(--border-radius);
    font-size: 13px;
    line-height: 1.4;
    word-wrap: break-word;
}

.message-content h3 {
    color: var(--accent-color);
    margin: 15px 0 10px 0;
    font-size: 16px;
    font-weight: 600;
}

.message-content ul {
    margin: 10px 0;
    padding-left: 20px;
}

.message-content li {
    margin: 5px 0;
    line-height: 1.4;
}

.message-content strong {
    color: var(--accent-color);
    font-weight: 600;
}

.message-content p {
    margin: 10px 0;
}

.bot-message .message-content {
    color: var(--text-primary);
    border: none;
    background: transparent;
}

.user-message .message-content {
    color: var(--text-primary);
    border: none;
    background: transparent;
}

.assistant-input-container {
    padding: 16px 20px;
    border-top: none;
    background: rgba(255, 255, 255, 0.02);
    width: 100%;
}

.assistant-input-wrapper {
    display: flex;
    gap: 8px;
    align-items: center;
}

.assistant-input {
    flex: 1;
    height: 44px;
    background: rgba(255, 255, 255, 0.05);
    border: none;
    border-radius: 22px;
    padding: 0 20px;
    color: var(--text-primary);
    font-size: 14px;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.assistant-input:focus {
    outline: none;
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 0 2px rgba(107, 114, 128, 0.3);
}

.assistant-input::placeholder {
    color: var(--text-muted);
}

.assistant-send-btn,
.assistant-voice-btn {
    width: 44px;
    height: 44px;
    background: var(--accent-color);
    border: none;
    border-radius: 22px;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    font-size: 14px;
    box-shadow: 0 2px 8px rgba(107, 114, 128, 0.3);
}

.assistant-send-btn:hover,
.assistant-voice-btn:hover {
    background: var(--accent-hover);
    transform: scale(1.05);
}

.assistant-voice-btn.recording {
    background: #ef4444;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}



.question-header h3 {
    color: var(--text-primary);
    margin: 0 0 20px 0;
    font-size: 1.5em;
    font-weight: 700;
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--accent-color);
}

.question-text {
    color: var(--text-primary);
    font-size: 16px;
    line-height: 1.6;
    margin-bottom: 20px;
    text-align: center;
}

.question-image-container {
    text-align: center;
    margin: 20px 0;
}

.question-image {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
}

.quiz-question-text {
    color: var(--accent-color);
    font-size: 16px;
    line-height: 1.6;
    margin-bottom: 20px;
    text-align: center;
}

.cloze-sentence{
    color: var(--text-primary)!important;
    font-size: 16px;
    line-height: 1.6;
    margin-bottom: 20px;
    text-align: center;
}

.cloze-sentence input{
    background: color-mix(in srgb, var(--accent-color) 15%, transparent);
}

.answer-button.mpc-button {
    background: color-mix(in srgb, var(--accent-color) 5%, transparent);
    border:1px solid rgba(0, 0, 0, 0.1);
    border-radius: 5px;
    color: var(--text-primary);
    transition: var(--transition);
    border-radius: 0;
    font-size: 16px;
    line-height: 1.3;
    padding: 10px;
    text-align: left;
    list-style: none;
    margin: 2px 0;
}

.answer-button.mpc-button:hover {
    background:   color-mix(in srgb, var(--accent-color) 10%, transparent);
    border: 1px solid var(--accent-color);
    border-radius: 5px;
    color: var(--accent-color);

}

.answer-button.mpc-button.selected {
    background: transparent;
    border: none;
    color: var(--text-primary);
}

.answer-button.mpc-button.correct, .answer-button.mpc-button.correct:hover{

    border: none;
    background-color: rgba(74, 222, 128, 0.2)!important;
}

.answer-button.mpc-button.incorrect, .answer-button.mpc-button.incorrect:hover {

    border: none;
    background-color: rgba(248, 113, 113, 0.2)!important;


}

.answer-button.mpc-button:disabled {
    opacity: 1;
    cursor: not-allowed;
}

.question-feedback {
    margin-top: 20px;
    padding: 15px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius);
    border: 1px solid var(--glass-border);
}

.feedback-message {
    color: var(--text-primary);
    margin-bottom: 15px;
    font-size: 14px;
}

.next-question-btn {
    background: var(--accent-color);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 14px;
    transition: var(--transition);
}

.next-question-btn:hover {
    background: var(--accent-hover);
}

/* ===== NARRATION CONTROLS ===== */

.narration-controls {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 10;
}

.narration-generate-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-color);
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 14px;
    backdrop-filter: blur(10px);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.narration-generate-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
    text-decoration: none;
    color: var(--text-color);
}

.narration-controls-bottom {
    text-align: center;
    margin-top: 20px;
    padding: 15px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.narration-generate-btn-bottom {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-color);
    padding: 10px 16px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 16px;
    backdrop-filter: blur(10px);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.narration-generate-btn-bottom:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
    text-decoration: none;
    color: var(--text-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.narration-generate-btn-bottom i {
    font-size: 18px;
}


.course-content-area{
    color: var(--text-primary);
}

/* Unit Card */
.unit-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-large);
    padding: 20px;
    padding-top:10px;
    transition: var(--transition);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: flex-start;
    gap: 15px;
    text-decoration: none;
    color: inherit;
    cursor: pointer;
    min-height: 150px;
}

.unit-card:hover {
    opacity: 0.9;
    border-color: var(--accent-color);
    text-decoration: none;
    color: inherit;
}

.unit-content {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    height: 100%;
}

/* Subunit Header */
.subunit-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 15px;
    margin-bottom: 15px;
}

.subunit-header .unit-title {
    flex: 1;
    margin: 0;
}

.unit-title {
    color: var(--text-primary);
    font-size: 1.4em;
    margin: 0 0 8px 0;
    font-weight: 600;
    line-height: 1.4;

}

.unit-description {
    color: var(--text-primary);
    font-size: 14px;
    line-height: 1.4;
    margin: 0 0 15px 0;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Button Container and Unit Button */
.button-container {
    display: flex;
    justify-content: center;
    margin-top: auto;
}

.unit-button {
    background: transparent;
    color: var(--accent-color);
    padding: 12px 20px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--accent-color);
    display: inline-block;
    pointer-events: none;
}

/* ===== COURSE LAYOUT & UNIT DETAIL STYLES ===== */

/* Override main-content styles for courses layout */
.main-content {
    margin-left: 0 !important;
    flex: none !important;
    width: 100% !important;
    height: 100vh !important;
}

/* Courses Layout */
.course-layout {
    height: 100vh;
    width: 100%;
    margin: 0;
    padding: 0;
}

/* Courses Content */
.course-content {
    padding: 30px;
    padding-top:0px;
    padding-left: 90px; /* Push content away from collapsed sidebar */
    overflow-y: auto;
    background: rgba(255, 255, 255, 0.02);
    min-width: 0;
    margin: 0;
    position: relative;
    height: auto;
    min-height: 100vh;
}

/* Centered Content Area */
.course-content-area {
    border-radius: 24px;
    padding: 40px;
    padding-top:0px;
    min-height: 500px;
    max-width: 1200px;
    margin: 0 auto;
}

/* Breadcrumb Styles */
.breadcrumb-nav {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.breadcrumb-link {
    color: var(--text-secondary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 5px;
    transition: var(--transition);
    padding: 5px 10px;
    border-radius: var(--border-radius);
}

.breadcrumb-link:hover {
    color: var(--text-primary);
    background: var(--glass-hover);
}

.breadcrumb-separator {
    color: var(--text-muted);
    font-size: 12px;
}

.breadcrumb-current {
    color: var(--text-primary);
    font-weight: 600;
}

/* Course Header */
.topic-header {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 15px;
    margin-bottom: 40px;
    background: transparent !important;
    border: none !important;
    border-radius: 0 !important;
    padding: 0 !important;
    box-shadow: none !important;
}

.topic-title {
    color: var(--text-primary);
    font-size: 2.5em;
    font-weight: 700;
    margin: 0;
    line-height: 1.2;
}

.topic-description {
    color: var(--text-primary);
    font-size: 1.1em;
    line-height: 1.6;
    margin: 0;
    max-width: 800px;
}

.topic-meta {
    display: flex;
    gap: 20px;
    margin-top: 15px;
    flex-wrap: wrap;
}

.topic-meta-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 14px;
}

.topic-meta-item i {
    color: var(--accent-color);
}

/* Units Grid */
.units-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 30px;
}

/* Medium screens - 3 columns */
@media (max-width: 1400px) {
    .units-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Unit Icon Container */
.unit-icon-container {
    position: relative;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.unit-icon {
    width: 50px;
    height: 50px;
    background: transparent;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-color);
    font-size: 36px;
    transition: var(--transition);
}

.unit-icon:hover {
    color: var(--accent-hover);
    transform: scale(1.1);
}

.unit-icon-placeholder {
    width: 70px;
    height: 70px;
    background: transparent;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 24px;
    border: none;
}

.generate-icon-btn {
    position: absolute;
    top: -5px;
    right: -5px;
    width: 25px;
    height: 25px;
    background: var(--accent-color);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    opacity: 0;
}

.unit-icon-container:hover .generate-icon-btn {
    opacity: 1;
}

.generate-icon-btn:hover {
    background: var(--accent-hover);
    transform: scale(1.1);
}

/* Topics List */
.topics-list {
    margin: 15px 0;
    border-top: 1px solid var(--glass-border);
    padding-top: 15px;
    list-style-type: disc;
    padding-left: 0px;
    color: var(--accent-color);
}

.topic-item {
    margin-bottom: 4px;
    padding: 4px 8px;
    background: transparent;
    border-radius: var(--border-radius);
    border: none;
    transition: var(--transition);
    list-style-type: disc;
}

.topic-item:hover {
    background: rgba(255, 255, 255, 0.05);
    font-weight:bold;
}

.topic-link {
    color: #B0B0B0;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    display: block;
    transition: var(--transition);
}

.topic-link:hover {
    color: var(--accent-hover);
    text-decoration: none;
}

/* Unit Link */
.unit-link {
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
}

.unit-link:hover {
    color: var(--accent-hover);
    text-decoration: none;
}

/* Responsive Design for Course Layout */
@media (max-width: 1200px) {
    .units-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .course-content {
        padding: 20px;
        padding-left: 20px;
    }

    .course-content-area {
        padding: 20px;
    }

    .topic-title {
        font-size: 2em;
    }

    .units-grid {
        grid-template-columns: 1fr;
    }

    .unit-icon {
        width: 40px;
        height: 40px;
        font-size: 40px;
    }
}

/* ===== TOPIC DETAIL PAGE STYLES ===== */

/* Override main-content styles for topic layout */
.main-content .topic-layout {
    margin-left: 0;
}

/* Topic Layout */
.topic-layout {
    height: 100vh;
    width: 100%;
    margin: 0;
    padding: 0;
}

/* Component Menu */
.component-menu {
    width: 280px;
    background: rgba(0, 0, 0, 0.15);
    backdrop-filter: blur(20px);
    border-left: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    z-index: 10;
}

.component-menu-header {
    padding: 20px;
    border-bottom: 1px solid var(--glass-border);
    background: rgba(0, 0, 0, 0.1);
}

.component-menu-header h3 {
    color: var(--text-primary);
    margin: 0;
    font-size: 18px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.component-menu-items {
    flex: 1;
    overflow-y: auto;
    padding: 15px;
    padding-top: 20px;
}

.component-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    margin-bottom: 8px;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.02);
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.component-item:first-child {
    margin-top: 0;
}

.component-item:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
    font-weight:bold
}

.component-item.active {
    color: var(--accent-color);
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--accent-color);
    font-weight: 600;
}

.component-item-text {
    flex: 1;
    font-size: 14px;
    font-weight: 500;
    line-height: 1.4;
    color: var(--text-primary) !important;
    word-wrap: break-word;
    hyphens: auto;
}

/* Section Menu Items */
.section-menu-item {
    margin-bottom: 20px;
}

.section-menu-title {
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 600;
    margin: 0 0 10px 0;
    padding: 0;
}

.component-list {
    list-style: none;
    padding: 0;
    margin: 0;
    counter-reset: component-counter;
}

.component-list-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 6px 0;
    margin-bottom: 2px;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-secondary);
    position: relative;
    counter-increment: component-counter;
}

/* Component list links adopt primary color */
.component-list-item a {
    color: var(--text-primary) !important;
    text-decoration: none !important;
    flex: 1;
}

.component-list-item:hover a {
    color: var(--text-primary) !important;
    font-weight: bold !important;
}

.component-list-item::before {
    content: counter(component-counter);
    color: var(--text-muted);
    font-size: 12px;
    font-weight: 600;
    min-width: 16px;
    text-align: center;
}

.component-list-item:hover {
    color: var(--text-primary);
    font-weight:bold;
}

.component-list-item.active {
    color: var(--accent-color);
    font-weight: 600;
}

/* Section Content Styling */
.section-container {
    margin-bottom: 40px;
}

.section-title {
    color: var(--text-primary);
    font-size: 24px;
    font-weight: 700;
    margin: 0 0 20px 0;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--accent-color);
}

/* Topic Content */
.topic-content {
    padding: 30px;
    padding-left: 90px; /* Push content away from collapsed sidebar */
    padding-right: 300px; /* Make space for the component menu */
    padding-top:0px;
    overflow-y: auto;
    background: rgba(255, 255, 255, 0.02);
    min-width: 0;
    margin: 0;
    position: relative;
    height: auto;
    min-height: 100vh;
}

/* Component Content Area */
.component-content-area {
    border-radius: 24px;
    padding: 40px;
    padding-top:0px;
    min-height: 500px;
    position: relative;
}

/* Component Div */
.component-div {
    max-width: 1000px;
    margin: 0 auto;
    cursor: pointer;
    transition: all 0.3s ease;
}

/* Force component headers to use user's theme color */
.component-header {
    color: var(--accent-color) !important;
    background: none;
    border: none !important;
}

.component-header h2,
.component-title,
.component-title-link,
.component-header h3,
.component-header h4 {
    color: var(--accent-color) !important;
}

/* Component HTML Content Styling */
.component-html-content {
    line-height: 1.6;
    color: var(--text-primary);
}

.component-html-content p {
    margin-bottom: 1em;
    font-size: 16px;
}

.component-html-content b {
    color: var(--text-bold);
    font-weight: 600;
}

.component-html-content h1,
.component-html-content h2,
.component-html-content h3,
.component-html-content h4,
.component-html-content h5,
.component-html-content h6 {
    color: var(--accent-color) !important;
    margin-top: 1.5em;
    margin-bottom: 0.5em;
}

.component-html-content ul,
.component-html-content ol {
    margin-left: 1.5em;
    margin-bottom: 1em;
}

.component-html-content li {
    margin-bottom: 0.5em;
}

.component-html-content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 1em 0;
}

.component-html-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1em 0;
}

.component-html-content th,
.component-html-content td {
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    text-align: left;
}

.component-html-content th {
    background-color: var(--bg-primary);
    font-weight: 600;
}

.component-html-content pre {
    min-width:60%;
    width: auto;

}

/* Component Body */
.component-body {
    font-size: 18px;
    padding-left: 20px;
    padding-right: 20px;
    padding-top: 20px;
}

.component-body p {

    text-align: left;
    line-height: 1.6;
    margin-bottom: 15px;
}

.component-body img {
    margin: 0px;
    max-width: 100%;
    height: auto;
}

/* Desktop only - component image styling */
@media (min-width: 769px) {
    .component-image {
        float: right;
        width: 300px;
        margin-left: 20px !important;
        margin-bottom: 20px !important;
    }
}

/* Study Agent with Navigation */
.study-agent-with-nav {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 20px auto;
    max-width: 600px;
    gap: 15px;
}

.study-agent {
    flex: 1;
    max-width: 500px;
}

/* Study Agent Modal - Hidden by default */
.study-agent-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.study-agent-modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.study-agent-modal-content {
    background: var(--bg-primary);
    border-radius: 16px;
    padding: 30px;
    max-width: 800px;
    width: 90%;
    height: 90vh;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    backdrop-filter: blur(20px);
    display: flex;
    flex-direction: column;
}

.study-agent-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.study-agent-modal-header h3 {
    color: var(--text-primary);
    margin: 0;
    font-size: 20px;
    font-weight: 600;
}

.modal-close {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: 50%;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-primary);
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.1);
}

.study-agent-modal-messages {
    flex: 1;
    overflow-y: auto;
    margin-bottom: 20px;
    padding: 15px;
    background: rgba(255, 255, 255, 0.02);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.study-agent-modal-input-container {
    margin-top: auto;
}

.study-agent-modal-input-wrapper {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.modal-voice-button {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-primary);
}

.modal-voice-button:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.1);
}

.modal-voice-button.recording {
    background: #ff4444;
    animation: pulse 1.5s infinite;
}

.unit-title {
    color: var(--text-primary);
    font-size: 1.4em;
    margin: 0 0 8px 0;
    font-weight: 600;
    line-height: 1.3;
}

.study-agent-modal-messages {
    flex: 1;
    overflow-y: auto;
    margin-bottom: 20px;
    padding: 15px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.unit-title {
    color: var(--text-primary);
    font-size: 1.5em;
    margin: 0 0 15px 0;
    font-weight: 550;
    line-height: 1.3;
}

.component-list-item::before {
    content: counter(component-counter);
    color: var(--text-muted);
    font-size: 12px;
    margin-right: 8px;
}

/* Responsive Design for Subunit Detail */
@media (max-width: 768px) {
    .subunit-content {
        padding: 20px;
        padding-left: 20px;
    }

    .subunit-content-area {
        padding: 20px;
    }

    .topics-grid {
        grid-template-columns: 1fr;
    }

    .course-image-tiny {
        width: 50px;
        height: 50px;
    }
}

/* ===== COURSE DETAIL PAGE STYLES ===== */

/* Course Image Container */
.course-image-container {
    position: relative;
    flex-shrink: 0;
}

.course-image {
    width: 120px;
    height: 120px;
    object-fit: cover;
    border-radius: var(--border-radius);
    border: 2px solid var(--glass-border);
    transition: var(--transition);
}

.course-image:hover {
    border-color: var(--accent-color);
    transform: scale(1.05);
}

.course-image-placeholder {
    width: 120px;
    height: 120px;
    background: var(--glass-bg);
    border: 2px dashed var(--glass-border);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 24px;
    transition: var(--transition);
}

.course-image-placeholder:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

/* Regenerate Icon Link */
.regenerate-icon-link {
    position: absolute;
    top: -5px;
    right: -5px;
    background: var(--accent-color) !important;
    border: 2px solid white !important;
    color: white !important;
    width: 35px;
    height: 35px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
    backdrop-filter: blur(10px);
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.regenerate-icon-link:hover {
    background: var(--accent-hover) !important;
    transform: scale(1.1);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
}

/* Course Info */
.course-info {
    flex: 1;
}

.course-title {
    color: var(--text-primary);
    font-size: 2.5em;
    margin: 0 0 10px 0;
    font-weight: 700;
}

.course-description {
    color: var(--text-secondary);
    font-size: 1.1em;
    line-height: 1.6;
    margin: 0;
}

/* Unit Image Tiny */
.unit-image-tiny {
    width: 60px;
    height: 60px;
    object-fit: cover;
    border-radius: var(--border-radius);
    border: 1px solid var(--glass-border);
    flex-shrink: 0;
    transition: var(--transition);
}

.unit-card:hover .unit-image-tiny {
    border-color: var(--accent-color);
}

.unit-image-placeholder {
    width: 60px;
    height: 60px;
    background: var(--glass-bg);
    border: 2px dashed var(--glass-border);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 16px;
    transition: var(--transition);
    flex-shrink: 0;
}

.unit-card:hover .unit-image-placeholder {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

/* Section Styling */
.section {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-large);
    padding: 25px;
    margin-bottom: 20px;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.section:hover {
    border-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

/* Section Title */
.section-title {
    color: var(--text-primary);
    font-size: 20px;
    font-weight: 600;
    margin: 0 0 15px 0;
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-title i {
    color: var(--accent-color);
}

.section-link {
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
}

.section-link:hover {
    color: var(--accent-hover);
    text-decoration: none;
}

.component-content {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
    margin: 0;
}

/* Responsive Design for Course Detail */
@media (max-width: 768px) {
    .course-image, .course-image-placeholder {
        width: 100px;
        height: 100px;
    }

    .unit-image-tiny {
        width: 50px;
        height: 50px;
    }
}

/* ===== COURSES LIST PAGE STYLES ===== */

/* Header Content */
.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

/* Unit Subtitle */
.unit-subtitle {
    color: var(--text-primary);
    font-size: 0.9em;
    margin-top: 5px;
    font-weight: 500;
    line-height: 1.4;
    text-align: center;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
    max-width: 900px;
    margin: 0 auto;
    grid-column: 1 / -1;
}

.empty-state-icon {
    font-size: 64px;
    margin-bottom: 20px;
    opacity: 0.5;
}

.empty-state-title {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.empty-state-description {
    font-size: 16px;
    margin-bottom: 30px;
    color: var(--text-secondary);
}

/* Add Class Container and Button */
.add-class-container {
    display: flex;
    justify-content: center;
    margin-top: 40px;
    padding: 20px;
}

.add-class-btn {
    background: transparent;
    color: var(--accent-color);
    border: 2px solid var(--accent-color);
    border-radius: 50%;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    cursor: pointer;
    transition: var(--transition);
}

.add-class-btn:hover {
    background: var(--accent-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

/* Responsive Design for Courses List */
@media (max-width: 1200px) {
    .units-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
}

/* ===== SUBUNIT CARD STYLES FOR UNIT DETAIL PAGE ===== */

/* Subunit Card - Left and bottom borders, no background, no radius */
.subunit-card {
    background: color-mix(in srgb, var(--accent-color) 3%, transparent);
    border: 1px solid rgba(141, 137, 137, 0.3);
    border-top: none;
    border-right: none;
    border-bottom: 1px solid var(--glass-border);
    border-radius: 10px;
    padding: 20px;
    transition: var(--transition);
    display: flex;
    align-items: flex-start;
    gap: 15px;
    text-decoration: none;
    color: inherit;
    cursor: pointer;
}

.subunit-card:hover {
    background: transparent;
    border-left: 1px solid var(--accent-color);
    border-top: none;
    border-right: none;
    border-bottom: 1px solid var(--glass-border);
    transform: none;
    text-decoration: none;
    color: inherit;
}

.subunit-content {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    height: 100%;
}

/* Subunit Title */
.subunit-title {
    color: var(--text-primary);
    font-size: 1.4em;
    margin: 0 0 8px 0;
    font-weight: 600;
    line-height: 1.3;
    padding-top: 20px;
    min-height:70px;
}


.subunit-link {
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
}

.subunit-link:hover {
    color: var(--accent-hover);
    text-decoration: none;
}

/* Subunit Icon Container */
.subunit-icon-container {
    position: relative;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.subunit-icon {
    width: 50px;
    height: 50px;
    background: transparent;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-color);
    font-size: 36px;
    transition: var(--transition);
}

.subunit-icon:hover {
    color: var(--accent-hover);
    transform: scale(1.1);
}

.subunit-icon-placeholder {
    width: 50px;
    height: 50px;
    background: transparent;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-color);
    font-size: 24px;
    border: none;
}

/* ===== STUDY AGENT STYLES FOR TOPIC DETAIL PAGE ===== */

/* Study Agent Input Wrapper (main page) - Match normal chatbot styling */
.study-agent-input-wrapper {
    display: flex;
    align-items: center;
    gap: 15px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 25px;
    padding: 8px;
    backdrop-filter: blur(10px);
    transition: var(--transition);
}

.study-agent-input-wrapper:focus-within {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.1);
}

/* Study Agent Logo */
.study-agent-logo {
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--border-radius-round);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-color);
    font-size: 16px;
    cursor: pointer;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.study-agent-logo:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

/* Study Agent Input - Match normal chatbot styling */
.study-agent-input-wrapper input[type="text"] {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    color: var(--text-primary);
    font-size: 16px;
    padding: 12px 16px;
    font-family: inherit;
}

.study-agent-input-wrapper input[type="text"]::placeholder {
    color: var(--text-muted);
    opacity: 0.7;
}

/* Modal Send Button */
.modal-send-button {
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--border-radius-round);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.modal-send-button:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

/* ===== NAVIGATION BUTTON STYLES ===== */

/* Navigation Buttons (Previous/Next) */
.nav-button {
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--border-radius-round);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.nav-button:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.nav-button i {
    font-size: 16px;
}

/* Navigation Button Positions */
.nav-button-right {
    margin: 0;
}

/* Menu fade functionality */
.faded {
    opacity: 0.1 !important;
    transition: opacity 15s ease-in-out;
}

.restoring {
    opacity: 1 !important;
    transition: opacity 0.2s ease-in-out;
}

/* Breadcrumb positioning above component content */
.breadcrumb-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0px;
    padding: 15px 0;

}

.breadcrumb-left {
    display: flex;
    align-items: center;
    gap: 10px;
}

.breadcrumb-right {
    display: flex;
    align-items: center;
}

/* Audio Control Button */
.audio-control-button {
    background: transparent;
    border: none;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-secondary);
    font-size: 1.2rem;
}

.audio-control-button:hover {
    color: var(--accent-color);
    transform: scale(1.1);
}

.audio-control-button.disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.audio-control-button.disabled:hover {
    color: var(--text-secondary);
    transform: none;
}

/* Component navigation at bottom center */
.component-navigation {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 10;
    justify-content: center;
}

/* ===== TOPIC DETAIL HEADER ===== */
.topic-detail-header {
    padding: 1.5rem 2rem 1rem 2rem;
    margin-bottom: 1rem;
}

.topic-detail-title {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.topic-info-icon {
    font-size: 1.2rem;
    color: var(--accent-color);
    cursor: pointer;
    transition: all 0.3s ease;
    opacity: 0.7;
}

.topic-info-icon:hover {
    opacity: 1;
    transform: scale(1.1);
    color: var(--accent-hover);
}

/* ===== TOPIC INFO MODAL ===== */
.topic-info-modal {
    display: none;
    position: fixed;
    z-index: 10000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.topic-info-modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    max-width: 900px;
    width: 90%;
    max-height: 85vh;
    box-shadow: var(--elevation-5);
    animation: slideUp 0.3s ease;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

@media (max-width: 768px) {
    .topic-info-modal-content {
        max-width: 95%;
        max-height: 90vh;
    }
}

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

.topic-info-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--glass-border);
    background: var(--bg-tertiary);
}

.topic-info-modal-header h3 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.topic-info-modal-header .modal-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.topic-info-modal-header .modal-close:hover {
    background: var(--glass-hover);
    color: var(--text-primary);
    transform: rotate(90deg);
}

.topic-info-modal-body {
    padding: 0;
    overflow-y: auto;
    color: var(--text-primary);
    line-height: 1.6;
}

.topic-info-modal-body p {
    margin: 0;
    font-size: 1rem;
}

/* Modal Tabs */
.modal-tabs {
    display: flex;
    gap: 0;
    border-bottom: 1px solid var(--glass-border);
    background: var(--bg-tertiary);
    padding: 0;
}

.modal-tab-button {
    flex: 1;
    padding: 1rem 1.5rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
}

.modal-tab-button:hover {
    background: var(--glass-hover);
    color: var(--text-primary);
}

.modal-tab-button.active {
    color: var(--accent-color);
    border-bottom-color: var(--accent-color);
    background: var(--glass-hover);
}

/* Modal Tab Content */
.modal-tab-content {
    display: none;
    padding: 1.5rem 1rem;
}

.modal-tab-content.active {
    display: block;
}

/* Modal Grid */
.modal-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
    gap: 1rem;
}

@media (max-width: 768px) {
    .modal-grid {
        grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
        gap: 0.75rem;
    }
}

/* Modal Cards */
.modal-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.75rem 0.5rem;
    background: transparent;
    border: none;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
}

.modal-card:hover {
    transform: translateY(-2px);
}

.modal-card-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 0.5rem;
    border-radius: 8px;
    overflow: hidden;
    position: relative;
}

/* Blue filter for topic icon images */
.modal-card-icon .topic-menu-icon-img {
    width: 60px !important;
    height: 60px !important;
    object-fit: contain;
    transition: all 0.3s ease;
    filter: brightness(0.8) sepia(1) hue-rotate(180deg) saturate(2);
}

.modal-card:hover .modal-card-icon .topic-menu-icon-img {
    transform: scale(1.1);
    filter: brightness(1) sepia(1) hue-rotate(180deg) saturate(2.5);
}

/* Resource images without blue filter */
.modal-card-icon .resource-image {
    width: 60px;
    height: 60px;
    object-fit: cover;
    border-radius: 8px;
}

.modal-card-icon i {
    font-size: 2rem;
    color: var(--accent-color);
    transition: all 0.3s ease;
}

.modal-card:hover .modal-card-icon i {
    transform: scale(1.1);
    color: var(--accent-hover);
}

.modal-card-title {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-primary);
    text-align: center;
    line-height: 1.2;
    word-break: break-word;
}

.topic-info-modal-content{
    min-height:400px;
}

/* Prevent iPad keyboard from auto-showing */
@supports (-webkit-touch-callout: none) {
    /* This targets iOS devices including iPad */
    input:not(:focus),
    textarea:not(:focus),
    select:not(:focus) {
        pointer-events: auto;
    }

    /* Prevent autofocus on iPad */
    input[autofocus],
    textarea[autofocus] {
        autofocus: false;
    }
}

/* Additional iPad-specific prevention */
@media (hover: none) and (pointer: coarse) {
    /* Targets touch devices like iPad */
    input:focus,
    textarea:focus {
        /* Prevent zoom on focus which triggers keyboard */
        font-size: 16px !important;
    }
}