.lessons-page-container {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
}
.glass-panel {
    width: 100%;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 0.5rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
}
#courseListContainer {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    min-width: 0;
    flex: 1;
}
#courseList {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1rem;
    width: 100%;
}
@keyframes history-spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}
/* Custom CSS for a modern, colorful look */
/* BASE STYLES: These apply by default, effectively serving as the DESKTOP-FIRST layout. */
body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color-primary, #0f172a);
    /* Dark blue-gray background */
    color: var(--text-color-primary, #e2e8f0);
    /* Light text color */
    display: flex; /* Changed to flex for main-layout */
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    overflow-y: auto;
    /* Allow scrolling for content */
    padding: 20px;
    /* Desktop padding */
    position: relative;
    /* Needed for positioning absolute children */
}

/* Variables for theming */
:root {
    --bg-color-primary: #0f172a;
    --bg-color-secondary: #1e293b;
    --text-color-primary: #e2e8f0;
    --text-color-secondary: #94a3b8;
    --accent-color-blue: #3b82f6;
    --accent-color-green: #22c55e;
    --accent-color-red: #ef4444;
    --button-bg-hover: #475569;
    --border-color: #334155;
    --box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

    /* NEW Theme variables for light and vibrant */
    --button-secondary-bg: #475569;
    --button-secondary-text: #e2e8f0;
    --button-secondary-hover-bg: #64748b;
    --card-bg: #334155;
    --timer-color: #818cf8;
    --scramble-color: #a78bfa;
    --stats-value-color: #67e8f9;
    --solve-time-color: #a78bfa;

    /* ADDED for consistency across themes for input fields */
    --input-bg: #1e293b;
    --input-text: #e2e8f0;
    --input-border: #475569;
    --input-focus-border: #3b82f6;
    --chat-bg: #0f172a;
}

/* Light theme - Fully upgraded for a pristine, modern look */
body.theme-light {
    --bg-color-primary: #f8f9fa; /* Very light, almost white background */
    --text-color-primary: #343a40; /* Soft dark gray for primary text */
    --bg-color-secondary: #ffffff; /* Pure white for the main container */
    --button-secondary-bg: #e9ecef; /* Very light gray for secondary buttons */
    --button-secondary-text: #495057; /* Medium dark gray for secondary button text */
    --button-secondary-hover-bg: #dee2e6; /* Slightly darker light gray for secondary button hover */
    --card-bg: #ffffff; /* White cards for a clean feel */
    --timer-color: #007bff; /* Vibrant blue for the timer */
    --scramble-color: #0056b3; /* Deep blue for scramble text */
    --stats-value-color: #17a2b8; /* Clear cyan for stats values */
    --solve-time-color: #0056b3; /* Deep blue for solve times */
    --border-color: #f1f3f5; /* Extremely subtle light gray border */
    --box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05), 0 2px 5px rgba(0, 0, 0, 0.02); /* Softer, more diffused shadow */
    --input-bg: #ffffff;
    --input-text: #1a202c;
    --input-border: #cbd5e1;
    --input-focus-border: #3b82f6;
    --chat-bg: #f8fafc;
}

/* Vibrant theme - Fully upgraded for a rich, deep, and energetic look */
body.theme-vibrant {
    --bg-color-primary: #120724; /* Deeper, luxurious dark purple background */
    --text-color-primary: #f8f9fa; /* Slightly warmer off-white text */
    --bg-color-secondary: #2c0a52; /* Rich, dark sapphire/amethyst for the main container */
    --button-secondary-bg: #7b2cbf; /* Vibrant, but not neon, purple for secondary buttons */
    --button-secondary-text: #f8f9fa; /* Light text for secondary buttons */
    --button-secondary-hover-bg: #9c36f0; /* Lighter, more saturated purple for secondary button hover */
    --card-bg: #3a0e6c; /* Medium-dark, rich purple for cards */
    --timer-color: #c084fc; /* Bright, almost electric lavender for the timer */
    --scramble-color: #e0f7fa; /* Very light, cool tone for scramble text */
    --stats-value-color: #20c997; /* Vibrant, slightly deeper teal for stats values */
    --solve-time-color: #e0f7fa; /* Very light, cool tone for solve times */
    --border-color: #4a148c; /* More distinct, yet harmonious purple border */
    --box-shadow: 0 30px 60px -15px rgba(0, 0, 0, 0.7), 0 15px 30px -7px rgba(0, 0, 0, 0.4); /* Stronger, more dramatic shadow for depth */
    --input-bg: #3a0c6a;
    --input-text: #e0f2fe;
    --input-border: #7b2cbf;
    --input-focus-border: #8b5cf6;
    --chat-bg: #220844;
}

/* NEW: Main Layout for Sidebar and Content */
.main-layout {
    display: flex;
    width: 100%;
    min-height: 100vh; /* Ensure it takes full height */
    padding: 0; /* Remove body padding, handled by child elements */
    margin: 0;
}

/* NEW: Sidebar Styling */
.sidebar {
    width: 80px; /* Retracted width */
    background-color: var(--bg-color-secondary);
    padding: 1.5rem 0.5rem; /* Adjusted padding for retracted state */
    border-right: 1px solid var(--border-color);
    box-shadow: var(--box-shadow);
    display: flex;
    flex-direction: column;
    align-items: center; /* Center items when retracted */
    gap: 1.5rem;
    overflow-y: auto;
    flex-shrink: 0;
    transition: width 0.3s ease-in-out; /* Smooth transition for width */
    border-radius: 0 1rem 1rem 0; /* Rounded corners on the right side */
    min-height: 100vh; /* Ensure it matches the height of the main layout */
}

.sidebar:hover {
    width: 200px; /* Expanded width on hover */
    align-items: flex-start; /* Align items to start when expanded */
    padding: 1.5rem; /* Restore full padding */
}

.sidebar .nav-item {
    display: flex;
    align-items: center;
    width: 100%;
    padding: 0.75rem 1rem;
    border-radius: 0.75rem;
    color: var(--text-color-primary);
    text-decoration: none;
    transition: background-color 0.2s ease-in-out, color 0.2s ease-in-out;
}

.sidebar .nav-item:hover {
    background-color: var(--button-secondary-hover-bg);
}

.sidebar .nav-item.active {
    background-color: var(--timer-color);
    color: white;
}

.sidebar .nav-icon {
    font-size: 1.5rem;
    margin-right: 0; /* No margin when retracted */
    transition: margin-right 0.3s ease-in-out;
}

.sidebar:hover .nav-icon {
    margin-right: 1rem; /* Add margin when expanded */
}

.sidebar .nav-text {
    display: none; /* Hidden by default */
    font-weight: 600;
    white-space: nowrap; /* Prevent text wrapping */
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
}

.sidebar:hover .nav-text {
    display: block; /* Show on hover */
    opacity: 1;
}

/* NEW: Content Area Styling */
.content-area {
    flex-grow: 1; /* Take remaining space */
    display: flex;
    justify-content: center;
    align-items: flex-start; /* Align to top */
    padding: 20px; /* Padding for the main content timer */
    overflow-y: auto; /* Allow scrolling for main content */
}

.container {
    background-color: var(--bg-color-secondary);
    border-radius: 1.5rem;
    /* Large rounded corners */
    box-shadow: var(--box-shadow); /* Use theme-defined box-shadow */
    max-width: 900px; /* Adjusted max-width for main content */
    width: 90%;
    /* Desktop relative width */
    padding: 2.5rem;
    /* Desktop padding */
    display: flex;
    flex-direction: column;
    gap: 2rem;
    /* Desktop gap */
    position: relative;
    /* For absolute positioning of elements like modals */
    border: 1px solid var(--border-color); /* Added border for definition */
}

/* Authentication buttons in the corner */
.auth-corner-buttons {
    position: absolute;
    top: 1.5rem;
    right: 2.5rem;
    z-index: 50;
    /* Ensure they are above other content */
}

.timer-display {
    font-size: 6rem;
    /* Desktop font size for timer */
    font-weight: 700;
    color: var(--timer-color);
    text-shadow: 0 0 15px rgba(129, 140, 248, 0.6);
    letter-spacing: -0.05em;
    margin-bottom: 1rem;
}

.timer-display.inspection {
    color: #fbbf24;
    /* Amber for inspection */
}

.timer-display.ready {
    color: #22c55e;
    /* Green when ready */
}

.button-primary {
    background: linear-gradient(145deg, #6366f1, #818cf8);
    /* Gradient button */
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 0.75rem;
    font-weight: 600;
    transition: all 0.2s ease-in-out;
    box-shadow: 0 5px 15px rgba(99, 102, 241, 0.4);
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    /* Base for desktop */
}

.button-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.6);
}

.button-primary:active {
    transform: translateY(0);
    box-shadow: 0 3px 10px rgba(99, 102, 241, 0.3);
}

.button-secondary {
    background-color: var(--button-secondary-bg);
    color: var(--button-secondary-text);
    padding: 0.75rem 1.5rem;
    border-radius: 0.75rem;
    font-weight: 600;
    transition: all 0.2s ease-in-out;
    box-shadow: 0 3px 10px rgba(71, 85, 105, 0.3); /* This shadow might need to be theme-aware too */
    border: none;
    cursor: pointer;
    font-size: 1rem;
    /* Base for desktop */
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.button-secondary:hover {
    background-color: var(--button-secondary-hover-bg);
    transform: translateY(-1px);
}

.button-secondary:active {
    transform: translateY(0);
    box-shadow: 0 1px 5px rgba(71, 85, 105, 0.2);
}

/* NEW: Styling for preview control buttons to make them colorful */
.button-preview-control {
    background: linear-gradient(145deg, #22c55e, #34d399); /* Green gradient */
    color: white;
    padding: 0.5rem; /* Smaller padding */
    border-radius: 50%; /* Circular */
    width: 40px; /* Fixed size */
    height: 40px; /* Fixed size */
    font-size: 1.2rem; /* Icon size */
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 8px rgba(34, 197, 94, 0.4);
    transition: all 0.2s ease-in-out;
}

.button-preview-control:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 12px rgba(34, 197, 94, 0.6);
}

.button-preview-control:active {
    transform: translateY(0);
    box-shadow: 0 2px 5px rgba(34, 197, 94, 0.3);
}

.scramble-display {
    background-color: var(--card-bg);
    padding: 1rem 1.5rem;
    border-radius: 0.75rem;
    font-size: 1.2rem;
    /* Desktop font size */
    font-weight: 500;
    color: var(--scramble-color);
    text-align: center;
    word-break: break-all;
    border: 1px solid var(--border-color); /* Added border for definition */
}

/* 3D Cube Container Styling */
#cube3DContainer {
    background-color: var(--bg-color-primary);
    border-radius: 0.75rem;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 300px;
    /* Desktop height */
    width: 100%;
    overflow: hidden;
    position: relative;
    border: 1px solid var(--border-color); /* Added border for definition */
}

/* Twisty player needs a height */
#scramble3DViewer {
    height: calc(100% - 60px);
    width: 100%;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    /* Desktop grid layout */
    gap: 1rem;
}

.stat-card {
    background-color: var(--card-bg);
    padding: 1rem;
    border-radius: 0.75rem;
    text-align: center;
    box-shadow: var(--box-shadow); /* Use theme-defined box-shadow */
    border: 1px solid var(--border-color); /* Added border for definition */
}

.stat-card .value {
    font-size: 1.8rem;
    /* Desktop font size */
    font-weight: 700;
    color: var(--stats-value-color);
    /* Cyan */
    margin-top: 0.5rem;
}

.solve-history-item {
    background-color: var(--card-bg);
    padding: 0.75rem 1.25rem;
    border-radius: 0.5rem;
    margin-bottom: 0.75rem;
    display: flex;
    /* Default to row for desktop */
    justify-content: space-between;
    align-items: center;
    transition: all 0.2s ease-in-out;
    flex-wrap: nowrap;
    /* Prevent wrapping on desktop */
    gap: 1rem;
    /* Desktop gap */
    border: 1px solid var(--border-color); /* Added border for definition */
}

.solve-history-item:hover {
    transform: translateX(5px);
    box-shadow: var(--box-shadow); /* Use theme-defined box-shadow */
}

.solve-history-item .time {
    font-size: 1.2rem;
    /* Desktop font size */
    font-weight: 600;
    color: var(--solve-time-color);
}

.solve-history-item .penalty-buttons {
    display: flex;
    gap: 0.5rem;
    /* Space between penalty buttons */
    flex-wrap: nowrap;
    /* Prevent wrapping on desktop */
    justify-content: flex-end;
    flex-grow: 1;
}

.solve-history-item .penalty-buttons button {
    background-color: #f87171;
    /* Red for DNF */
    color: white;
    padding: 0.3rem 0.7rem;
    border-radius: 0.375rem;
    font-size: 0.8rem;
    cursor: pointer;
    border: none;
    transition: background-color 0.2s;
}

.solve-history-item .penalty-buttons button.plus2 {
    background-color: #fbbf24;
    /* Amber for +2 */
}

.solve-history-item .penalty-buttons button.clear-penalty {
    background-color: #60a5fa;
    /* Blue for clear */
}

.solve-history-item .penalty-buttons button.delete {
    background-color: #dc2626;
    /* Strong red for delete */
    font-size: 0.9rem;
    padding: 0.4rem 0.8rem;
}

.solve-history-item .penalty-buttons button.insight-button {
    background-color: #4CAF50;
    /* Green for Insight */
    font-size: 0.9rem;
    padding: 0.4rem 0.8rem;
    box-shadow: 0 2px 5px rgba(76, 175, 80, 0.3);
}

.solve-history-item .penalty-buttons button.insight-button:hover {
    background-color: #45a049;
}

/* Voice Command Button Styling (fixed position) */
#voiceCommandBtn, #openChatBtn {
    background: linear-gradient(145deg, #6366f1, #818cf8); /* Primary button gradient */
    color: white;
    border-radius: 50%; /* Circular */
    width: 56px; /* Larger touch target */
    height: 56px; /* Larger touch target */
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem; /* Icon size */
    box-shadow: 0 4px 10px rgba(99, 102, 241, 0.4); /* Shadow from primary color */
    cursor: pointer;
    transition: background-color 0.2s, transform 0.2s, box-shadow 0.2s;
    z-index: 100; /* Ensure it's above other content */
    border: none; /* No border */
}

#voiceCommandBtn:hover, #openChatBtn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.6);
}

#voiceCommandBtn:active, #openChatBtn:active {
    transform: translateY(0);
    box-shadow: 0 3px 10px rgba(99, 102, 241, 0.3);
}

#voiceCommandBtn.active {
    background-color: #dc3545; /* Red when active */
    animation: pulse-red 1s infinite;
}

@keyframes pulse-red {
    0% {
        box-shadow: 0 0 0 0 rgba(220, 53, 69, 0.7);
    }

    70% {
        box-shadow: 0 0 0 10px rgba(220, 53, 69, 0);
    }

    100% {
        box-shadow: 0 0 0 0 rgba(220, 53, 69, 0);
    }
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.modal.open {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background-color: var(--bg-color-secondary);
    padding: 2rem;
    /* Desktop padding */
    border-radius: 1rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    width: 90%;
    /* Desktop width */
    max-width: 500px;
    /* Desktop max-width */
    position: relative;
    color: var(--text-color-primary);
    max-height: 90vh;
    /* Prevent content from overflowing screen vertically */
    overflow-y: auto;
    /* Allow scrolling within modal if content is too long */
    border: 1px solid var(--border-color); /* Added border for definition */
}

/* Specifically for AI Insight Modal to take more width on desktop */
#aiInsightModal .modal-content {
    max-width: 700px;
    color: var(--text-color-primary); /* Ensure text color is theme-aware */
    border: 1px solid var(--border-color);
    box-shadow: var(--box-shadow);
    /* Default background, overridden by theme-specific rules below */
    background-color: var(--card-bg);
}

/* AI Insight Modal specific styling for Light Theme */
body.theme-light #aiInsightModal .modal-content {
    background: linear-gradient(135deg, var(--card-bg), #f0f0f0); /* White to very light gray gradient */
    color: var(--text-color-primary); /* Ensure text is dark */
    border-color: var(--border-color);
    box-shadow: var(--box-shadow);
}

/* AI Insight Modal specific styling for Vibrant Theme */
body.theme-vibrant #aiInsightModal .modal-content {
    background: linear-gradient(135deg, var(--card-bg), #2a0b4d); /* Dark purple to slightly darker purple */
    color: var(--text-color-primary); /* Ensure text is light */
    border-color: var(--border-color);
    box-shadow: var(--box-shadow);
}


.modal-close-button {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-color-primary);
    cursor: pointer;
}

.text-gradient {
    background: linear-gradient(90deg, #6366f1, #a78bfa, #f87171);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* NEW: Voice Feedback Display Styling - Moved to bottom center */
.voice-feedback-display {
    position: fixed;
    bottom: 5%; /* Position from the bottom */
    left: 50%; /* Center horizontally */
    transform: translateX(-50%); /* Adjust for true horizontal centering */
    background-color: rgba(0, 0, 0, 0.9); /* Darker, more opaque background */
    backdrop-filter: blur(8px); /* Subtle blur effect */
    -webkit-backdrop-filter: blur(8px); /* For Safari */
    color: white;
    padding: 20px 30px; /* More padding */
    border-radius: 15px; /* More rounded corners */
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6); /* Stronger shadow */
    font-size: 1.3rem; /* Larger font */
    font-weight: 600;
    z-index: 1002; /* Above modals */
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s ease-out, transform 0.4s ease-out; /* Smooth transitions */
    display: flex;
    flex-direction: column; /* Stack text and indicator */
    align-items: center;
    gap: 10px; /* Space between text and indicator */
    min-width: 280px; /* Minimum width for the popup */
    text-align: center;
    pointer-events: none; /* Allow clicks to pass through when hidden */
}

.voice-feedback-display.listening-active {
    opacity: 1;
    visibility: visible;
    /* No Y-transform on activation, only X for centering */
    transform: translateX(-50%);
    pointer-events: auto; /* Allow interaction when visible if needed, though usually just for display */
}

/* Listening Indicator Dots */
.listening-indicator {
    display: flex;
    gap: 8px; /* Larger gap between dots */
}

.listening-indicator .dot {
    width: 10px; /* Larger dots */
    height: 10px; /* Larger dots */
    background-color: var(--accent-color-green);
    border-radius: 50%;
    opacity: 0.3;
    animation: bounce 1.4s infinite ease-in-out both;
}

.listening-indicator .dot:nth-child(1) {
    animation-delay: -0.32s;
}
.listening-indicator .dot:nth-child(2) {
    animation-delay: -0.16s;
}
.listening-indicator .dot:nth-child(3) {
    animation-delay: 0s;
}

@keyframes bounce {
    0%, 80%, 100% {
        transform: scale(0);
        opacity: 0.3;
    }
    40% {
    transform: scale(1);
        opacity: 1;
    }
}

/* NEW: Speaking Indicator (optional, if we want a different animation when Jarvis is speaking) */
.voice-feedback-display.speaking .listening-indicator .dot {
    background-color: var(--accent-color-blue); /* Different color when speaking */
    animation: pulse-dot 1s infinite ease-in-out;
}

@keyframes pulse-dot {
    0% {
        transform: scale(0.8);
        opacity: 0.7;
    }
    50% {
        transform: scale(1.2);
        opacity: 1;
    }
    100% {
        transform: scale(0.8);
        opacity: 0.7;
    }
}

/* NEW: Chat Modal Styling */
#chatModal .modal-content {
    max-width: 450px; /* Slightly wider for chat */
    max-height: 80vh; /* Controlled height */
    display: flex;
    flex-direction: column;
    background: linear-gradient(135deg, #1e293b, #0f172a); /* Darker gradient for chat */
    border: 1px solid #334155;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.5);
}

#chatHistory {
    flex-grow: 1;
    overflow-y: auto;
    padding: 1rem;
    background-color: #1a202c; /* Darker background for chat history */
    border-radius: 0.5rem;
    margin-bottom: 1rem;
    scroll-behavior: smooth; /* Smooth scrolling for new messages */
    border: 1px solid #2d3748;
}

.chat-message {
    margin-bottom: 0.5rem;
    line-height: 1.4;
    padding: 0.5rem 0.75rem;
    border-radius: 0.75rem;
    max-width: 85%; /* Limit width for messages */
    word-wrap: break-word; /* Ensure long words break */
}

.user-message {
    text-align: right;
    color: #e2e8f0; /* Light text for user */
    background-color: #3b82f6; /* Blue background for user messages */
    margin-left: auto; /* Push to right */
    border-bottom-right-radius: 0; /* Flat corner on sender side */
}

.jarvis-message {
    text-align: left;
    color: #cbd5e1; /* Slightly darker text for Jarvis */
    background-color: #475569; /* Slate background for Jarvis messages */
    margin-right: auto; /* Push to left */
    border-bottom-left-radius: 0; /* Flat corner on sender side */
}

.chat-message .font-bold {
    font-weight: 700;
}

.chat-message .text-indigo-400 {
    color: #818cf8; /* Jarvis's name color */
}

.chat-message .text-green-400 {
    color: #d1fae5; /* Lighter green for user's name on blue background */
}

.chat-input-container {
    display: flex;
    gap: 0.5rem;
    align-items: flex-end; /* Align input and button at the bottom */
}

/* Corrected .input-field styling for general use */
.input-field {
    flex-grow: 1;
    min-height: 40px; /* Minimum height for consistency */
    padding: 0.75rem;
    border-radius: 0.75rem; /* More rounded corners for beauty */
    background-color: var(--input-bg); /* Use theme variable */
    border: 1px solid var(--input-border); /* Use theme variable */
    color: var(--input-text); /* Use theme variable */
    font-size: 1rem;
    resize: vertical; /* Allow vertical resizing for textareas */
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1); /* Subtle inner shadow */
}

.input-field:focus {
    outline: none;
    border-color: var(--input-focus-border); /* Use theme variable */
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3); /* Blue glow on focus */
}


#chatInput { /* Specific overrides for chat input if needed, but .input-field should handle most */
    max-height: 120px; /* Max height before scrolling */
}

#chatSendBtn {
    padding: 0.75rem 1rem;
    border-radius: 0.75rem; /* Consistent with input-field */
    font-size: 1rem;
}

/* Custom Scrollbar for chat history */
.custom-scrollbar::-webkit-scrollbar {
    width: 8px;
}

.custom-scrollbar::-webkit-scrollbar-track {
    background: #2d3748; /* Darker track */
    border-radius: 10px;
}

.custom-scrollbar::-webkit-scrollbar-thumb {
    background: #4a5568; /* Scrollbar thumb color */
    border-radius: 10px;
}

.custom-scrollbar::-webkit-scrollbar-thumb:hover {
    background: #64748b; /* Darker on hover */
}

/* MOBILE-SPECIFIC STYLES: These OVERRIDE desktop styles on smaller screens. */
/* Targeting screens up to 767px wide (typical for most phones and small tablets) */
@media (max-width: 767px) {
    body {
        padding: 0;
        /* Reduced padding for mobile */
    }

    .main-layout {
        flex-direction: column; /* Stack sidebar and content vertically */
        padding: 0; /* Handled by child elements */
    }

    .sidebar {
        width: 100%; /* Full width on mobile */
        padding: 1rem 0.5rem; /* Adjusted padding for mobile */
        border-right: none;
        border-bottom: 1px solid var(--border-color); /* Separator */
        box-shadow: none; /* Remove sidebar shadow on mobile */
        gap: 1rem;
        flex-direction: row; /* Horizontal layout for mobile nav */
        justify-content: space-around; /* Distribute items evenly */
        align-items: center;
        border-radius: 0; /* No rounded corners on mobile for full width */
        min-height: auto; /* Allow height to adjust to content */
        height: auto;
    }

    .sidebar:hover {
        width: 100%; /* No width change on hover for mobile */
        padding: 1rem 0.5rem;
        align-items: center;
    }

    .sidebar .nav-item {
        flex-direction: column; /* Stack icon and text vertically */
        padding: 0.5rem;
        font-size: 0.8rem; /* Smaller font for mobile nav text */
    }

    .sidebar .nav-icon {
        margin-right: 0 !important; /* No margin on mobile */
        margin-bottom: 0.25rem; /* Space between icon and text */
        font-size: 1.2rem; /* Smaller icon size for mobile */
    }

    .sidebar .nav-text {
        display: block; /* Always show text on mobile */
        opacity: 1;
        font-size: 0.7rem; /* Even smaller for text */
    }

    .sidebar:hover .nav-text {
        display: block; /* Still show on hover, but no change */
        opacity: 1;
    }

    .content-area {
        padding: 16px; /* Padding for main content on mobile */
    }

    .container {
        padding: 1.5rem;
        /* Reduced padding for mobile */
        gap: 1.5rem;
        /* Reduced gap for mobile */
        max-width: 100%;
        /* Take full width on mobile */
        width: 100%;
    }

    .auth-corner-buttons {
        /* On mobile, stack buttons vertically and align to the right, inside the container flow */
        flex-direction: column;
        align-items: flex-end;
        margin-top: 0.5rem;
        /* Adjust to fit content well */
        margin-bottom: 0.5rem;
        position: static; /* Remove absolute positioning on mobile */
    }

    .auth-corner-buttons button {
        padding: 0.5rem 1rem;
        /* Slightly larger touch targets */
        font-size: 0.875rem;
        /* Slightly larger font for readability */
        width: auto;
        /* Allow buttons to size to content */
    }

    h1 {
        font-size: 2.5rem;
        /* Smaller heading for mobile */
        margin-bottom: 1rem;
        /* Adjusted margin */
    }

    .timer-display {
        font-size: 4rem;
        /* Smaller timer font for mobile */
        margin-bottom: 0.5rem;
    }

    .scramble-display {
        font-size: 1rem;
        /* Smaller scramble font for mobile */
        padding: 0.8rem 1rem;
        /* Adjusted padding */
    }

    #cube3DContainer {
        height: 250px;
        /* Adjusted height for mobile */
    }

    /* Control buttons flex-direction is already column for sm: (which is 640px)
        but we can specify here for max-width just to be explicit if needed */
    .flex-col.sm\:flex-row {
        /* Targeting the control buttons div */
        flex-direction: column;
        gap: 0.75rem;
        /* Adjusted gap */
    }

    .button-primary,
    .button-secondary {
        font-size: 0.9rem;
        /* Slightly smaller button font */
        padding: 0.6rem 1rem;
        /* Reduced padding */
    }

    .stats-grid {
        grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
        /* 2 columns on mobile, adjusts */
        gap: 0.8rem;
        /* Smaller gap for stats */
    }

    .stat-card {
        padding: 0.7rem;
        /* Adjusted padding */
    }

    .stat-card .value {
        font-size: 1.5rem;
        /* Smaller stat value font */
    }

    .solve-history-item {
        flex-direction: column;
        /* Stack time and buttons */
        align-items: flex-start;
        /* Align contents to start */
        gap: 0.5rem;
        /* Gap between time and buttons block */
        padding: 0.6rem 1rem;
        /* Smaller padding */
    }

    .solve-history-item .time {
        font-size: 1.0rem;
    }

    .solve-history-item .penalty-buttons {
        flex-direction: row; /* Ensure buttons stay in a row on mobile */
        flex-wrap: wrap; /* Allow wrapping if many buttons */
        justify-content: flex-start; /* Align to start on mobile */
        width: 100%; /* Take full width to align buttons */
        margin-left: 0; /* Remove left margin */
    }

    .solve-history-item .penalty-buttons button {
        padding: 0.3rem 0.6rem; /* Smaller padding for mobile buttons */
        font-size: 0.75rem; /* Smaller font for mobile buttons */
    }

    /* Adjustments for voice feedback and chat on mobile */
    .voice-feedback-display, .chat-container {
        bottom: 10px; /* Closer to bottom edge on mobile */
        left: 10px; /* Adjust left position */
        right: 10px; /* Adjust right position */
        transform: none; /* Remove transform for fixed positioning */
        width: auto; /* Allow width to be determined by left/right */
        max-width: calc(100% - 20px); /* Max width for mobile */
        padding: 15px 20px; /* Adjusted padding */
        font-size: 1rem; /* Smaller font */
        border-radius: 10px; /* Smaller border radius */
    }

    .chat-container {
        height: 60vh; /* Adjust height for mobile chat */
    }

    #voiceCommandBtn, #openChatBtn {
        width: 48px; /* Smaller buttons on mobile */
        height: 48px;
        font-size: 1.5rem; /* Smaller icon */
        bottom: 10px; /* Adjust position */
        right: 10px;
        left: auto; /* Ensure right alignment */
    }

    #openChatBtn {
        left: 10px; /* Align chat button to left */
        right: auto;
    }
}

/* Further adjustments for very small screens (e.g., iPhone SE) */
@media (max-width: 479px) {
    .timer-display {
        font-size: 3rem;
        /* Even smaller timer font for very small screens */
    }

    h1 {
        font-size: 2rem;
        /* Even smaller heading for very small screens */
    }

    .scramble-display {
        font-size: 0.9rem;
        /* Even smaller scramble font */
    }

    .stat-card .value {
        font-size: 1.3rem;
        /* Even smaller stat value font */
    }

    .button-primary,
    .button-secondary {
        font-size: 0.9rem;
        /* Slightly smaller button font */
        padding: 0.6rem 1rem;
        /* Reduced padding */
    }

    .solve-history-item .penalty-buttons button {
        font-size: 0.7rem;
        /* Smallest penalty button font */
    }
}

/* Spinner for loading states */
.spinner {
    border: 4px solid #ccc !important;
    border-top: 4px solid #3b82f6 !important;
    border-radius: 50% !important;
    width: 40px !important;
    height: 40px !important;
    animation: spin 1s linear infinite !important;
    will-change: transform !important;
    display: block !important;
    position: relative !important;
    z-index: 10000 !important;
    pointer-events: none !important;
    background: transparent !important;
}

/* History Loading Spinner - Dedicated styles */
#historyLoadingSpinner {
    border: 4px solid #ccc;
    border-top: 4px solid #3b82f6;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: block;
    position: relative;
    margin: 2rem auto;
    animation: spin-history 1s ease infinite;
    will-change: transform;
}

#historyLoadingSpinner.hidden {
    display: none !important;
}

@keyframes spin-history {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* TOAST NOTIFICATIONS */
.toast-container {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.toast {
    background-color: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 10px 20px;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
    opacity: 0;
    transition: opacity 0.3s ease-in-out, transform 0.3s ease-in-out;
    transform: translateY(20px);
    min-width: 200px;
    text-align: center;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

/* ================================================================================= */
/* === LESSONS PAGE SPECIFIC STYLES (OVERHAUL) === */
/* ================================================================================= */

/* This ensures the content area correctly handles the lessons page layout */
.lessons-page-container {
    width: 100%;
    max-width: 1600px; /* Wider for a more expansive feel */
    margin: 0 auto;
    color: var(--text-color-primary);
    display: flex; /* Use flex to manage showing/hiding sections */
    flex-direction: column;
    gap: 1.5rem;
}

/* General glass-panel style for all major sections within lessons */
.glass-panel {
    background-color: rgba(30, 41, 59, 0.6); /* Slightly more transparent */
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 1.5rem;
    box-shadow: var(--box-shadow);
    transition: all 0.3s ease-in-out;
}

/* --- Lesson Hub Styles --- */
#courseListContainer {
    min-height: 500px; /* Increased min-height to prevent shrinking */
    border-radius: 0.75rem;
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    color: var(--input-text);
    transition: min-height 0.3s ease; /* Smooth transition */
}

#courseList {
    min-height: 400px; /* Prevent shrinking */
    min-width: 100%; /* Ensure full width */
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); /* Responsive columns with min width */
    gap: 1.5rem;
}

.course-card {
    background-color: var(--card-bg);
    border-radius: 1.25rem;
    padding: 1.5rem;
    text-align: left;
    border: 1px solid transparent; /* Start with transparent border */
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
    overflow: hidden;
}

.course-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.4);
    border-color: var(--accent-color-blue);
}

.course-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color-primary);
    margin-bottom: 0.5rem;
}

.course-card .course-description {
    color: var(--text-color-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
    flex-grow: 1;
    margin-bottom: 1rem;
}

.course-card .course-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-color-secondary);
    margin-bottom: 1.5rem;
}

.course-card .course-meta span {
    background-color: rgba(0,0,0,0.2);
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.course-card .course-card-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
}


/* --- Lesson Viewer Styles --- */
#lessonViewer {
    width: 100%;
}

/* Course Navigation Sidebar */
#courseNavigationSidebar {
    min-height: 70vh; /* Good height for the sidebar */
}

#moduleList .module-item {
    margin-bottom: 1rem;
}

#moduleList .module-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-color-primary);
    margin-bottom: 0.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem;
    border-radius: 0.5rem;
    transition: color 0.2s ease, background-color 0.2s ease;
}

#moduleList .module-title:hover {
    color: var(--accent-color-blue);
    background-color: var(--button-bg-hover);
}

#moduleList .module-title .module-chevron {
    transition: transform 0.2s ease;
}

#moduleList .module-title.expanded .module-chevron {
    transform: rotate(90deg);
}

#moduleList .lesson-list {
    list-style: none;
    padding-left: 1.5rem;
    margin-top: 0.5rem;
    border-left: 2px solid var(--border-color);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-in-out;
}

#moduleList .lesson-list.open {
    max-height: 500px; /* Arbitrary large value for smooth expansion */
}

#moduleList .lesson-item {
    padding: 0.6rem 0.75rem;
    cursor: pointer;
    color: var(--text-color-secondary);
    transition: color 0.2s ease, background-color 0.2s ease, border-left-color 0.2s ease;
    border-radius: 0.5rem;
    position: relative;
    border-left: 3px solid transparent;
}

#moduleList .lesson-item:hover {
    color: var(--text-color-primary);
    background-color: var(--button-bg-hover);
}

#moduleList .lesson-item.active {
    color: white;
    background-color: var(--accent-color-blue);
    font-weight: 600;
    border-left-color: var(--accent-color-green);
}

/* Lesson Content Display & Editor */
#lessonContentDisplay {
    font-size: 1.05rem;
}

#lessonContentDisplay h1, #lessonContentDisplay h2, #lessonContentDisplay h3 {
    color: var(--text-color-primary);
    font-weight: 700;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    padding-bottom: 0.25rem;
    border-bottom: 1px solid var(--border-color);
}
#lessonContentDisplay h1 { font-size: 2rem; }
#lessonContentDisplay h2 { font-size: 1.6rem; }
#lessonContentDisplay h3 { font-size: 1.3rem; }

#lessonContentDisplay code {
    background-color: rgba(0, 0, 0, 0.3);
    padding: 0.2em 0.4em;
    border-radius: 0.3em;
    font-family: 'Fira Code', monospace;
    font-size: 0.9em;
}

#lessonContentDisplay pre {
    background-color: rgba(0, 0, 0, 0.5);
    padding: 1em;
    border-radius: 0.5em;
    overflow-x: auto;
    margin-top: 1em;
    margin-bottom: 1em;
}

/* Markdown Editor Styling */
.CodeMirror, .CodeMirror-scroll {
    min-height: 400px;
    border-radius: 0.75rem;
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    color: var(--input-text);
}
.editor-toolbar {
    background-color: var(--bg-color-secondary) !important;
    border-top-left-radius: 0.75rem;
    border-top-right-radius: 0.75rem;
    border-bottom: 1px solid var(--input-border) !important;
}
.editor-toolbar button:hover {
    background-color: var(--button-bg-hover) !important;
    border-color: var(--button-bg-hover) !important;
}

/* 3D Viewer & Quiz Area */
#scramble3DContainer .button-preview-control {
    background-color: var(--button-secondary-bg);
    color: var(--button-secondary-text);
    box-shadow: none;
}
#scramble3DContainer .button-preview-control:hover {
    background-color: var(--button-secondary-hover-bg);
    transform: scale(1.05);
}

#quizArea {
    display: flex; /* Ensure it's flex for child elements */
}
#quizQuestionsContainer .question-item {
    background-color: rgba(0,0,0,0.2);
    padding: 1rem;
    border-radius: 0.75rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
}
#quizQuestionsContainer .question-item p {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}
#quizQuestionsContainer .answer-option {
    display: block; /* Use block for label to contain input */
    margin-bottom: 0.5rem;
    cursor: pointer;
    padding: 0.75rem;
    border-radius: 0.5rem;
    transition: background-color 0.2s ease;
    border: 1px solid var(--border-color);
}
#quizQuestionsContainer .answer-option:hover {
    background-color: var(--button-bg-hover);
}
#quizQuestionsContainer .answer-option input {
    margin-right: 0.75rem;
    accent-color: var(--accent-color-blue);
}

/* Quiz feedback styling */
#quizQuestionsContainer .answer-option.correct {
    background-color: rgba(34, 197, 94, 0.2);
    border-color: #22c55e;
}
#quizQuestionsContainer .answer-option.incorrect {
    background-color: rgba(239, 68, 68, 0.2);
    border-color: #ef4444;
}
#quizQuestionsContainer .answer-option.reveal-correct {
    background-color: rgba(34, 197, 94, 0.3);
    border-color: #22c55e;
    font-weight: bold;
}

/* In-Lesson Chat Sidebar */
#inLessonChatContainer.open {
    transform: translateX(0);
}

/* --- Mobile Responsiveness for Lessons Page --- */
@media (max-width: 1023px) { /* Tablets and below */
    #lessonViewer {
        grid-template-columns: 1fr; /* Stack sidebar and content */
    }
    #courseNavigationSidebar {
        min-height: auto; /* Allow height to adjust */
    }
}

@media (max-width: 767px) { /* Mobile phones */
    .lessons-page-container {
        padding: 0.5rem;
    }
    .glass-panel {
        padding: 1rem;
    }
    #courseList {
        grid-template-columns: 1fr;
    }
    .course-card h3 {
        font-size: 1.2rem;
    }
    #inLessonChatContainer {
        max-width: 95%;
    }
}

/* Additional CSS fixes for lessons page */



/* Auto-expand chat input textarea height */
#courseChatInput {
    overflow-y: hidden; /* Hide scrollbar */
    min-height: 2.5rem;
    max-height: 8rem;
    resize: none;
}


/* Fix for course list container to prevent shrinking and overlapping */
#courseListContainer {
    min-height: 500px !important; /* Increased min-height to prevent shrinking */
    border-radius: 0.75rem;
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    color: var(--input-text);
    transition: min-height 0.3s ease;
    display: flex !important;
    flex-direction: column !important;
    flex-grow: 1 !important;
    position: relative !important;
}

#courseList {
    min-height: 400px !important; /* Prevent shrinking */
    min-width: 100% !important; /* Ensure full width */
    display: grid !important;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)) !important; /* Responsive columns with min width */
    gap: 1.5rem !important;
    flex-grow: 1 !important;
    align-self: stretch !important;
}

.course-card {
    min-width: 280px !important; /* Prevent cards from shrinking too small */
    min-height: 180px !important; /* Ensure cards have enough height */
    display: flex !important;
    flex-direction: column !important;
    justify-content: space-between !important;
}

/* Fix chat container and input to remove unnecessary scrollbar */
#courseChatContainer {
    min-height: 60vh !important;
    display: flex !important;
    flex-direction: column !important;
    background-color: var(--input-bg) !important;
    border-radius: 0.75rem !important;
    padding: 1rem !important;
    overflow: hidden !important; /* Prevent unnecessary scrollbars */
}

#courseChatMessages {
    flex-grow: 1 !important;
    overflow-y: auto !important;
    padding: 0.5rem !important;
    margin-bottom: 0.5rem !important;
}

#courseChatInput {
    resize: none !important;
    min-height: 2.5rem !important;
    max-height: 5rem !important;
    overflow-y: auto !important; /* Allow scroll only if content exceeds max height */
    border-radius: 0.5rem !important;
    padding: 0.5rem !important;
    font-size: 1rem !important;
    border: 1px solid var(--input-border) !important;
    background-color: var(--input-bg) !important;
    color: var(--input-text) !important;
    transition: border-color 0.3s ease !important;
}

#courseChatInput:focus {
    outline: none !important;
    border-color: var(--input-focus-border) !important;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3) !important;
}

.lesson-viewer-grid {
    display: grid;
    grid-template-columns: 280px 1fr;
    grid-template-rows: auto 1fr auto;
    grid-template-areas:
        "header header"
        "sidebar main"
        "footer footer";
    gap: 1rem;
    height: calc(100vh - 4rem); /* Adjust based on your layout's padding/margin */
    background-color: var(--bg-color-primary);
    color: var(--text-color-primary);
    border-radius: 1rem;
    overflow: hidden;
}

.lesson-header {
    grid-area: header;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background-color: var(--bg-color-secondary);
    border-bottom: 1px solid var(--border-color);
}

.course-navigation-sidebar {
    grid-area: sidebar;
    padding: 1.5rem;
    background-color: var(--bg-color-secondary);
    overflow-y: auto;
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.lesson-content-panel {
    grid-area: main;
    padding: 1.5rem;
    overflow-y: auto;
    background-color: var(--bg-color-primary);
    display: flex;
    flex-direction: column;
}

.lesson-interactive-panel {
    grid-area: main; /* Overlap with main content, control visibility with JS */
    padding: 1.5rem;
    overflow-y: auto;
    display: none; /* Initially hidden */
    flex-direction: column;
    background-color: var(--bg-color-primary);
}


.lesson-footer {
    grid-area: footer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background-color: var(--bg-color-secondary);
    border-top: 1px solid var(--border-color);
}

.inline-twisty-player-container {
    background-color: var(--bg-color-secondary);
    border-radius: 0.75rem;
    padding: 1rem;
    margin: 1rem 0;
    border: 1px solid var(--border-color);
}