body {
    font-family: 'Inter', sans-serif;
    transition: background-color 0.3s, color 0.3s;
}
.sidebar {
    transition: transform 0.3s ease-in-out;
}
#sidebar-resize-handle {
    position: absolute;
    top: 0;
    right: -2.5px;
    width: 5px;
    height: 100%;
    cursor: col-resize;
    z-index: 10;
}
#notification {
    transition: opacity 0.5s, transform 0.5s;
    z-index: 10000; /* Ensure it's on top of everything */
}
.editor-container {
    position: relative;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    min-height: 0; /* CRITICAL FIX for flexbox scrolling */
}
.editor {
    flex-grow: 1;
    overflow-y: auto;
    outline: none;
    transition: background-color 0.3s;
    padding: 1rem;
    border-radius: 0 0 0.5rem 0.5rem;
    color: inherit;
}
.editor img, .editor video { max-width: 100%; height: auto; border-radius: 8px; }
.editor iframe { max-width: 100%; border-radius: 8px; }
.editor ul, .editor ol { padding-left: 2rem; }
.editor ul { list-style: disc; }
.editor ol { list-style: decimal; }
.drop-zone-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 150, 255, 0.2);
    border: 2px dashed #0096ff;
    border-radius: 8px;
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    z-index: 100;
}
.drop-zone-active .drop-zone-overlay {
    display: flex;
}
#global-drop-zone {
    transition: opacity 0.2s;
}
.toolbar-btn {
    background-color: transparent; border: 1px solid #4a5568; border-radius: 4px;
    color: white; padding: 0.25rem 0.75rem; transition: background-color 0.2s;
    font-size: 1rem; width: 38px; height: 38px;
    display: inline-flex; align-items: center; justify-content: center;
}
.toolbar-btn:hover { background-color: #4a5568; }
.toolbar-btn.active { background-color: #4A90E2; }
input[type="color"] { width: 38px; height: 38px; border: 1px solid #4a5568; border-radius: 4px; padding: 4px; background-color: #2d3748; cursor: pointer; }

#whiteboard-btn.is-live {
    animation: yellow-pulse 2s infinite;
}

.modal { transition: opacity 0.3s ease-out, transform 0.3s ease-out, background-color 0.3s; }
#notes-grid, #collaboration-notes-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 1rem; }
.note-card {
    border: 2px solid transparent; /* Changed border to 2px for selection state */
    border-radius: 8px;
    padding: 1rem;
    cursor: pointer;
    height: 300px; /* Increased height */
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
    transition: background-color 0.3s, transform 0.2s, border-color 0.2s, opacity 0.2s;
}
.note-card.is-archived {
    opacity: 0.6;
    border-style: dashed;
}
.note-card.selected {
    border-color: #4A90E2;
    transform: scale(0.95);
}
.in-select-mode .note-card:hover {
    transform: scale(1.02); /* Different hover effect in select mode */
}
.note-card:not(.in-select-mode):hover { transform: translateY(-5px); }
.note-card-title {
    font-weight: bold;
    margin-bottom: 0.5rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    text-align: center;
    flex-shrink: 0;
}
.note-card-content { flex-grow: 1; overflow: hidden; font-size: 0.9rem; }
.note-card-content * { color: inherit; }

/* --- Live Share Card Styles --- */
.live-share-card {
    position: relative;
    border: 2px solid #f87171; /* red-400 */
    box-shadow: 0 0 15px rgba(248, 113, 113, 0.5);
}
.live-share-card .live-badge {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    background-color: #ef4444; /* red-500 */
    color: white;
    padding: 0.1rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-weight: bold;
    animation: pulse 2s infinite;
}
.live-share-card .note-card-content {
    background-color: #111827; /* gray-900 */
    display: flex;
    align-items: center;
    justify-content: center;
}
.live-share-card video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

@keyframes yellow-pulse {
    0%, 100% { box-shadow: 0 0 8px rgba(250, 204, 21, 0.5); }
    50% { box-shadow: 0 0 16px rgba(250, 204, 21, 0.9); }
}

/* --- Checklist Styles --- */
.editor ul li.task-item {
    list-style-type: none; /* Hide the default bullet point */
    position: relative;
    padding-left: 28px; /* Make room for our custom checkbox */
    margin-left: -28px; /* Pull it back in line with other text */
}

.editor ul li.task-item::before {
    content: '☐'; /* The empty checkbox character */
    position: absolute;
    left: 0;
    top: 2px;
    font-size: 1.1rem;
    line-height: 1;
    cursor: pointer;
    color: #9ca3af; /* A nice gray color for the box */
}

.editor ul li.task-item.checked {
    text-decoration: line-through;
    color: #718096; /* Gray out the text when checked */
}

.editor ul li.task-item.checked::before {
    content: '☑'; /* The checked checkbox character */
    color: #4A90E2; /* A nice blue to show it's completed */
}

.sidebar-icon-btn { color: #9ca3af; transition: color 0.2s; }
.sidebar-icon-btn:hover { color: white; }
#edit-note-pane, #new-note-pane, #chat-log-pane {
    position: fixed;
    z-index: 50;
    transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94), background-color 0.3s;
}
#edit-note-pane {
    top: 0;
    right: 0;
    width: 100%;
    height: 100%;
    transform: translateX(100%);
}
#chat-log-pane {
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transform: translateX(-100%);
}
#side-pane-resize-handle {
    position: absolute;
    top: 0;
    left: -2.5px;
    width: 5px;
    height: 100%;
    cursor: col-resize;
    z-index: 10;
}
#edit-note-pane.is-open, #chat-log-pane.is-open {
    transform: translateX(0);
}
 #new-note-pane {
    bottom: 0;
    left: 0;
    right: 0;
    transform: translateY(100%);
    height: 90vh;
}
#new-note-pane.is-open {
    transform: translateY(0);
}
.text-input-field {
    transition: background-color 0.3s, color 0.3s;
}
.recent-notes-container {
    display: flex;
    gap: 1rem;
    overflow-x: auto;
    padding-bottom: 1rem;
}
.recent-note-card {
    flex: 0 0 220px;
    height: 250px; /* Increased height */
}
.search-container {
    position: relative;
}
.search-container svg {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: #9ca3af;
}
.search-container input {
    padding-left: 2.5rem;
}
.action-btn {
    width: 40px;
    height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 9999px;
    transition: background-color 0.2s;
}
#qr-code-container, #collab-qr-code-container {
    display: flex;
    justify-content: center;
    background-color: white;
    padding: 1rem;
    border-radius: 0.5rem;
}
.toggle-bg:checked ~ .dot {
    transform: translateX(1.5rem);
}
 .toggle-bg:checked ~ .block {
    background-color: #4A90E2;
}
#batch-action-bar {
    transition: transform 0.3s ease-in-out;
}
 @media (min-width: 768px) {
    #edit-note-pane, #chat-log-pane {
        width: 50%;
        max-width: 800px;
    }
    #new-note-pane {
         height: 60vh;
    }
}
.custom-scrollbar::-webkit-scrollbar {
    width: 8px;
}
.custom-scrollbar::-webkit-scrollbar-track {
    background: transparent;
}
.custom-scrollbar::-webkit-scrollbar-thumb {
    background-color: #4a5568; /* gray-700 */
    border-radius: 4px;
    border: 2px solid transparent;
    background-clip: content-box;
}
.custom-scrollbar::-webkit-scrollbar-thumb:hover {
    background-color: #718096; /* gray-600 */
}

/* --- New Chat Styles --- */
#chat-container {
    position: fixed;
    bottom: 80px;
    left: 0;
    right: 0;
    height: 300px;
    pointer-events: none;
    z-index: 45;
    display: flex;
    justify-content: center;
}
.floating-chat-bubble-container {
    position: absolute;
    bottom: 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    opacity: 0;
    animation: floatUp 8s linear forwards;
    pointer-events: all;
    left: 50%;
    transform: translateX(-50%);
}
.floating-chat-bubble-container img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid white;
    box-shadow: 0 0 5px rgba(0,0,0,0.5);
}
.chat-bubble {
    background-color: rgba(31, 41, 55, 0.95);
    color: white;
    padding: 0.75rem 1.25rem;
    border-radius: 1.5rem;
    max-width: 250px;
    word-wrap: break-word;
    font-size: 1.2rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}
.chat-bubble strong {
    font-weight: 700;
    font-size: 0.9rem;
    color: #a0aec0;
}
.typing-indicator {
    position: absolute;
    bottom: 60px;
    left: 50%;
    transform: translateX(-50%);
    background-color: #4a5568;
    border-radius: 1rem;
    padding: 0.25rem 0.75rem;
    display: flex;
    gap: 4px;
    opacity: 0;
    transition: opacity 0.3s;
}
.typing-indicator.visible {
    opacity: 1;
}
.typing-indicator span {
    width: 6px;
    height: 6px;
    background-color: white;
    border-radius: 50%;
    animation: typing-bounce 1.2s infinite ease-in-out;
}
.typing-indicator span:nth-child(2) { animation-delay: -1.0s; }
.typing-indicator span:nth-child(3) { animation-delay: -0.8s; }

@keyframes floatUp {
    0% { opacity: 1; transform: translate(-50%, 0) scale(0.8); }
    20% { transform: translate(-50%, -40px) scale(1); }
    80% { opacity: 1; }
    100% { opacity: 0; transform: translate(-50%, -280px) scale(1); }
}

@keyframes typing-bounce {
    0%, 60%, 100% { transform: translateY(0); }
    30% { transform: translateY(-4px); }
}

/* Chat Log Pane Styles */
#chat-log-messages {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
}
.chat-log-line {
    display: flex;
    gap: 0.75rem;
    max-width: 75%;
}
.chat-log-line.is-self {
    margin-left: auto;
    flex-direction: row-reverse;
}
.chat-log-line img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    flex-shrink: 0;
}
.chat-log-bubble {
    padding: 0.5rem 1rem;
    border-radius: 1.25rem;
}
.chat-log-line.is-self .chat-log-bubble {
    background-color: #2b6cb0; /* Blue 600 */
}
.chat-log-line:not(.is-self) .chat-log-bubble {
    background-color: #4a5568; /* Gray 600 */
}
.chat-log-bubble strong {
    display: block;
    font-weight: 600;
    font-size: 0.8rem;
    margin-bottom: 0.25rem;
    color: #cbd5e0; /* Gray 400 */
}
.fab-peek-btn {
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    z-index: 40;
    width: 4rem;
    height: 7rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: all 0.3s ease-in-out;
}
#fab-add-note {
    right: 0;
    border-radius: 1.5rem 0 0 1.5rem;
    font-size: 2.5rem;
    line-height: 1;
}
#fab-chat-log {
    left: 0;
    border-radius: 0 1.5rem 1.5rem 0;
}
#fab-chat-log .unread-dot {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 12px;
    height: 12px;
    background-color: #ef4444; /* red-500 */
    border-radius: 50%;
    border: 2px solid white;
    display: none;
}
#fab-chat-log.has-unread .unread-dot {
    display: block;
}
.fab-peek-btn span {
    font-weight: bold;
}
#fab-chat-log span {
     writing-mode: vertical-rl;
    text-orientation: mixed;
    transform: rotate(180deg);
    letter-spacing: 0.1em;
}
#session-info-hub details > summary {
    list-style: none;
}
#session-info-hub details > summary::-webkit-details-marker {
    display: none;
}

/* VIDEO WALL STYLES */
#video-wall-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden; /* This is important! */
}

/* This rule is for direct .mp4 files */
#video-wall-backdrop video {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100%;
    height: 100%;
    object-fit: fill; /* This will distort direct videos as you wanted */
    transform: translate(-50%, -50%);
}

/* This new, separate rule is specifically for YouTube iframes */
#video-wall-backdrop iframe {
    position: absolute;
    top: 50%;
    left: 50%;
    /* These values force the iframe to be huge to hide black bars */
    width: 178vh; /* 16:9 ratio using viewport height */
    min-width: 100vw; 
    height: 100vh;
    min-height: 56.25vw; /* 16:9 ratio using viewport width */
    transform: translate(-50%, -50%);
}

#video-wall-backdrop .overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5); /* Tint */
}

#video-wall-mute-btn {
    position: fixed;
    bottom: 1rem;
    right: 1rem;
    z-index: 45;
}

#whiteboard-canvas {
    position: absolute;
    top: 0;
    left: 0;
    cursor: crosshair;
}

/* --- Loading Overlay Styles --- */
.loader-spinner {
    border: 8px solid #f3f3f3; /* Light grey */
    border-top: 8px solid #3498db; /* Blue */
    border-radius: 50%;
    width: 60px;
    height: 60px;
    animation: spin 1s linear infinite;
}

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