/* AI Chatbot Widget Styles */
.ai-chatbot-widget {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 9999;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

/* Chatbot Toggle Button */
.chatbot-toggle-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.chatbot-toggle-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.chatbot-toggle-btn i {
    color: white;
    font-size: 28px;
    transition: transform 0.3s ease;
}

.chatbot-toggle-btn.active i {
    transform: rotate(90deg);
}

/* Notification Badge */
.chatbot-notification-badge {
    position: absolute;
    top: -5px;
    right: -5px;
    background-color: #ff4757;
    color: white;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    font-weight: bold;
    animation: pulse 2s infinite;
}

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

/* Chatbot Window */
.chatbot-window {
    position: fixed;
    bottom: 100px;
    right: 20px;
    width: 400px;
    height: 600px;
    background: white;
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    display: none;
    flex-direction: column;
    overflow: hidden;
    animation: slideUp 0.3s ease;
}

.chatbot-window.show {
    display: flex;
}

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

/* Chatbot Header */
.chatbot-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.chatbot-header-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.chatbot-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.chatbot-header-text h3 {
    margin: 0;
    font-size: 16px;
    font-weight: 600;
}

.chatbot-header-text p {
    margin: 0;
    font-size: 12px;
    opacity: 0.9;
}

.chatbot-header-actions {
    display: flex;
    gap: 8px;
}

.chatbot-header-actions button {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.chatbot-header-actions button:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* Chatbot Messages */
.chatbot-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    background: #f8f9fa;
    scroll-behavior: smooth;
}

.chatbot-message {
    display: flex;
    margin-bottom: 16px;
    animation: fadeIn 0.3s ease;
}

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

.chatbot-message.user {
    justify-content: flex-end;
}

.chatbot-message.assistant {
    justify-content: flex-start;
}

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    flex-shrink: 0;
}

.message-avatar.user-avatar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    margin-left: 8px;
}

.message-avatar.bot-avatar {
    background: #e9ecef;
    color: #495057;
    margin-right: 8px;
}

.message-content {
    max-width: 70%;
    padding: 12px 16px;
    border-radius: 16px;
    word-wrap: break-word;
    position: relative;
}

.chatbot-message.user .message-content {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-bottom-right-radius: 4px;
}

.chatbot-message.assistant .message-content {
    background: white;
    color: #333;
    border-bottom-left-radius: 4px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.message-time {
    font-size: 10px;
    opacity: 0.7;
    margin-top: 4px;
    text-align: right;
}

/* Typing Indicator */
.typing-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: white;
    border-radius: 16px;
    border-bottom-left-radius: 4px;
    max-width: 70px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #999;
    animation: typing 1.4s infinite;
}

.typing-indicator span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typing {
    0%, 60%, 100% {
        transform: translateY(0);
    }
    30% {
        transform: translateY(-10px);
    }
}

/* Chatbot Input */
.chatbot-input-wrapper {
    padding: 16px;
    background: white;
    border-top: 1px solid #e9ecef;
}

.chatbot-input-container {
    display: flex;
    gap: 8px;
    align-items: flex-end;
}

.chatbot-input {
    flex: 1;
    border: 2px solid #e9ecef;
    border-radius: 24px;
    padding: 12px 16px;
    font-size: 14px;
    resize: none;
    max-height: 120px;
    overflow-y: auto;
    transition: border-color 0.2s;
}

.chatbot-input:focus {
    outline: none;
    border-color: #667eea;
}

.chatbot-send-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s;
    flex-shrink: 0;
}

.chatbot-send-btn:hover:not(:disabled) {
    transform: scale(1.1);
}

.chatbot-send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Empty State */
.chatbot-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    color: #6c757d;
    padding: 40px;
}

.chatbot-empty-state i {
    font-size: 64px;
    margin-bottom: 16px;
    opacity: 0.3;
}

.chatbot-empty-state h4 {
    margin-bottom: 8px;
    font-size: 18px;
    color: #495057;
}

.chatbot-empty-state p {
    margin: 0;
    font-size: 14px;
}

/* Suggested Questions */
.suggested-questions {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 16px;
    width: 100%;
}

.suggested-question {
    background: white;
    border: 2px solid #e9ecef;
    border-radius: 12px;
    padding: 12px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 13px;
    text-align: left;
}

.suggested-question:hover {
    border-color: #667eea;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.15);
}

/* Scrollbar Styles */
.chatbot-messages::-webkit-scrollbar {
    width: 6px;
}

.chatbot-messages::-webkit-scrollbar-track {
    background: #f8f9fa;
}

.chatbot-messages::-webkit-scrollbar-thumb {
    background: #cbd5e0;
    border-radius: 3px;
}

.chatbot-messages::-webkit-scrollbar-thumb:hover {
    background: #a0aec0;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .chatbot-window {
        width: calc(100vw - 20px);
        height: calc(100vh - 120px);
        right: 10px;
        bottom: 90px;
    }

    .message-content {
        max-width: 85%;
    }
}

/* Session List Modal */
.chatbot-sessions-modal {
    position: absolute;
    top: 60px;
    right: 0;
    width: 300px;
    max-height: 400px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    overflow: hidden;
    display: none;
    animation: fadeIn 0.2s ease;
}

.chatbot-sessions-modal.show {
    display: block;
}

.chatbot-sessions-header {
    padding: 16px;
    background: #f8f9fa;
    border-bottom: 1px solid #e9ecef;
    font-weight: 600;
    font-size: 14px;
}

.chatbot-sessions-list {
    max-height: 340px;
    overflow-y: auto;
}

.chatbot-session-item {
    padding: 12px 16px;
    border-bottom: 1px solid #e9ecef;
    cursor: pointer;
    transition: background 0.2s;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chatbot-session-item:hover {
    background: #f8f9fa;
}

.chatbot-session-info {
    flex: 1;
}

.chatbot-session-title {
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 4px;
    color: #333;
}

.chatbot-session-time {
    font-size: 11px;
    color: #6c757d;
}

.chatbot-session-delete {
    background: none;
    border: none;
    color: #dc3545;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    opacity: 0;
    transition: all 0.2s;
}

.chatbot-session-item:hover .chatbot-session-delete {
    opacity: 1;
}

.chatbot-session-delete:hover {
    background: #fee;
}

/* Hide chatbot on exam pages */
body[data-page*="bai-thi"] .ai-chatbot-widget,
body[data-page*="baithi"] .ai-chatbot-widget {
    display: none !important;
}

/* Hide chatbot when not authenticated */
body:not(.authenticated) .ai-chatbot-widget {
    display: none !important;
}