:root {
    --chat-bg: #ffffff;
    --sidebar-bg: #f8fafc;
    --message-user-bg: #ffeb3b;
    --message-assistant-bg: #f8fafc;
    --border-color: #e2e8f0;
    --brand-color: #ffeb3b;
    --accent-yellow: #ffd600;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --card-bg: #ffffff;
    --hover-bg: #f1f5f9;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
}

html, body {
    height: 100%;
    overflow: hidden;
    background-color: var(--chat-bg);
}

.sidebar {
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    height: 100vh;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.main-content {
    height: 100vh;
    background-color: var(--chat-bg);
}

/* Brand Header */
.brand-header {
    text-align: left;
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 2rem;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.logo-image {
    height: 55px;
    width: auto;
    object-fit: contain;
}

.ai-badge {
    background: linear-gradient(135deg, var(--accent-yellow), #ffd600);
    color: var(--text-primary);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    letter-spacing: 0.5px;
    box-shadow: var(--shadow-sm);
}

.beta-badge {
    background: var(--text-secondary);
    color: white;
    font-size: 0.65rem;
    font-weight: 600;
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.brand-subtitle {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0;
    line-height: 1.4;
}

/* Topics Section */
.topics-section {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.topics-header {
    color: var(--text-primary);
    font-weight: 700;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 1rem;
    border-bottom: 2px solid var(--accent-yellow);
    padding-bottom: 0.5rem;
}

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

.topic-item {
    color: var(--text-secondary);
    font-size: 0.9rem;
    padding: 0.75rem 0;
    cursor: pointer;
    transition: all 0.3s ease;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
}

.topic-item:hover {
    color: var(--text-primary);
    background: var(--hover-bg);
    margin: 0 -1.5rem;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
    border-radius: 8px;
    border-bottom-color: transparent;
}

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

.topic-item i {
    color: var(--accent-yellow);
    width: 20px;
    margin-right: 0.75rem;
    font-size: 0.9rem;
}

/* Chat Container */
.chat-container {
    height: 100%;
}

.chat-messages {
    overflow-y: auto;
    max-height: calc(100vh - 120px);
}

/* Welcome Message */
.welcome-message {
    max-width: 700px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

.welcome-icon {
    color: var(--accent-yellow);
    font-size: 4.5rem;
    margin-bottom: 1rem;
}

.welcome-title {
    color: var(--text-primary);
    font-weight: 700;
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}

.welcome-subtitle {
    color: var(--text-secondary);
    font-size: 1.2rem;
    line-height: 1.7;
    margin-bottom: 2rem;
}

/* Chat Messages */
.message {
    margin-bottom: 2rem;
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    animation: messageSlideIn 0.3s ease-out;
}

.message.user {
    flex-direction: row-reverse;
}

.message-avatar {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-weight: 600;
    font-size: 1.1rem;
}

.message.user .message-avatar {
    background: linear-gradient(135deg, var(--accent-yellow), #ffd600);
    color: var(--text-primary);
    box-shadow: var(--shadow-md);
}

.message.assistant .message-avatar {
    background: linear-gradient(135deg, var(--accent-yellow), #ffd600);
    color: var(--text-primary);
    box-shadow: var(--shadow-md);
}

.message-content {
    max-width: 75%;
    padding: 1.25rem 1.5rem;
    border-radius: 16px;
    word-wrap: break-word;
    line-height: 1.7;
    font-size: 0.95rem;
}

.message.user .message-content {
    background: linear-gradient(135deg, var(--accent-yellow), #ffd600);
    color: var(--text-primary);
    border-bottom-right-radius: 6px;
    font-weight: 500;
    box-shadow: var(--shadow-md);
}

.message.assistant .message-content {
    background-color: var(--message-assistant-bg);
    color: var(--text-primary);
    border-bottom-left-radius: 6px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

/* Markdown formatting in messages */
.message-content strong {
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.05em;
}

.message-content em {
    font-style: italic;
    color: var(--text-secondary);
}

.message-content h1, .message-content h2, .message-content h3 {
    color: var(--text-primary);
    font-weight: 700;
    margin: 0.5rem 0;
}

/* Welcome Screen Optimization */
.welcome-message {
    max-width: 700px;
    margin: 0 auto;
    padding: 1.5rem !important;
}

.welcome-icon i {
    font-size: 2.5rem !important;
    color: var(--accent-yellow);
}

.welcome-title {
    font-size: 1.8rem !important;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem !important;
}

.welcome-subtitle {
    font-size: 0.95rem !important;
    color: var(--text-secondary);
    margin-bottom: 1rem !important;
}

.suggested-questions h6 {
    font-size: 0.9rem !important;
    margin-bottom: 0.75rem !important;
}

.suggested-question.btn-sm {
    font-size: 0.8rem !important;
    padding: 0.4rem 0.6rem !important;
}

#chat-ready-status .alert {
    font-size: 0.85rem !important;
    margin-bottom: 0 !important;
}

.message-time {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.75rem;
    opacity: 0.8;
}

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

/* Chat Input */
.chat-input-container {
    padding: 1.25rem 1.5rem;
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.05);
}

.chat-input-wrapper {
    max-width: 700px;
    margin: 0 auto;
}

.chat-form .input-group {
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08), 0 2px 8px rgba(0, 0, 0, 0.04) !important;
    border-radius: 28px !important;
    overflow: hidden !important;
    border: 2px solid transparent !important;
    background: white !important;
    transition: all 0.3s ease !important;
}

.chat-form .input-group:focus-within {
    border-color: var(--accent-yellow) !important;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12), 0 0 0 4px rgba(255, 214, 0, 0.1) !important;
}

.chat-input-field.form-control {
    border: none !important;
    padding: 1rem 1.5rem !important;
    font-size: 1rem !important;
    background-color: transparent !important;
    color: var(--text-primary) !important;
    border-radius: 25px 0 0 25px !important;
    outline: none !important;
    font-weight: 500 !important;
}

.chat-input-field.form-control::placeholder {
    color: var(--text-muted) !important;
    opacity: 0.7 !important;
    font-weight: 400 !important;
}

.chat-input-field.form-control:focus {
    box-shadow: none !important;
    border-color: transparent !important;
    background-color: transparent !important;
}

.chat-submit-btn.btn {
    border: none !important;
    background: linear-gradient(135deg, var(--accent-yellow), #ffc107) !important;
    border-radius: 0 25px 25px 0 !important;
    padding: 1rem 2rem !important;
    font-size: 1rem !important;
    color: var(--text-primary) !important;
    font-weight: 600 !important;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
    box-shadow: none !important;
}

.chat-submit-btn.btn:hover {
    background: linear-gradient(135deg, #ffc107, var(--accent-yellow)) !important;
    transform: translateY(-1px) !important;
    box-shadow: 0 8px 24px rgba(255, 193, 7, 0.3) !important;
    color: var(--text-primary) !important;
}

.chat-submit-btn.btn:active {
    transform: translateY(0) !important;
    box-shadow: 0 4px 12px rgba(255, 193, 7, 0.2) !important;
}

.chat-submit-btn.btn:disabled {
    opacity: 0.6 !important;
    transform: none !important;
    box-shadow: none !important;
    cursor: not-allowed !important;
}

.chat-footer {
    text-align: center;
    margin-top: 1.5rem;
}

.chat-footer small {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Typing Indicator */
.typing-indicator {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1.25rem 1.5rem;
    background-color: var(--message-assistant-bg);
    border-radius: 16px;
    border-bottom-left-radius: 6px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.typing-indicator span {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.typing-dots {
    display: flex;
    gap: 0.3rem;
}

.typing-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--accent-yellow);
    animation: typing 1.4s infinite ease-in-out;
}

.typing-dot:nth-child(1) {
    animation-delay: -0.32s;
}

.typing-dot:nth-child(2) {
    animation-delay: -0.16s;
}

@keyframes typing {
    0%, 80%, 100% {
        opacity: 0.3;
        transform: scale(0.8);
    }
    40% {
        opacity: 1;
        transform: scale(1.2);
    }
}

/* Animations */
.welcome-message {
    animation: fadeIn 0.5s ease-in;
}

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

/* Admin Styles */
.admin-container {
    background-color: var(--chat-bg);
    min-height: 100vh;
}

.admin-header {
    background: var(--sidebar-bg);
    border-bottom: 1px solid var(--border-color);
}

.admin-content {
    background-color: var(--chat-bg);
    padding-bottom: 2rem;
}

.admin-header h2 {
    color: var(--text-primary);
    font-weight: 700;
}

.admin-header p {
    color: var(--text-secondary);
}

.admin-brand-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.admin-logo-image {
    height: 42px;
    width: auto;
    object-fit: contain;
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
}

.card-header {
    background: var(--sidebar-bg);
    border-bottom: 1px solid var(--border-color);
    border-radius: 12px 12px 0 0;
}

.card-header h5, .card-header h6 {
    color: var(--text-primary);
    font-weight: 600;
}

.card-body {
    color: var(--text-secondary);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-yellow), #ffd600);
    border: none;
    color: var(--text-primary);
    font-weight: 600;
    border-radius: 8px;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #ffd600, var(--accent-yellow));
    transform: translateY(-1px);
    color: var(--text-primary);
    box-shadow: var(--shadow-md);
}

.btn-outline-primary {
    border: 2px solid var(--accent-yellow);
    color: var(--accent-yellow);
    background: transparent;
    font-weight: 600;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.btn-outline-primary:hover {
    background: var(--accent-yellow);
    color: var(--text-primary);
    transform: translateY(-1px);
}

.btn-outline-secondary {
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    background: transparent;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.btn-outline-secondary:hover {
    background: var(--hover-bg);
    color: var(--text-primary);
    border-color: var(--text-secondary);
}

.alert {
    border-radius: 8px;
    border: none;
}

.alert-warning {
    background: rgba(255, 214, 0, 0.1);
    color: #b8860b;
    border-left: 4px solid var(--accent-yellow);
}

.alert-success {
    background: rgba(34, 197, 94, 0.1);
    color: #16a34a;
    border-left: 4px solid #22c55e;
}

.alert-info {
    background: rgba(59, 130, 246, 0.1);
    color: #2563eb;
    border-left: 4px solid #3b82f6;
}

.alert-danger {
    background: rgba(239, 68, 68, 0.1);
    color: #dc2626;
    border-left: 4px solid #ef4444;
}

/* Scrollbar Styling */
.chat-messages::-webkit-scrollbar,
.sidebar::-webkit-scrollbar {
    width: 6px;
}

.chat-messages::-webkit-scrollbar-track,
.sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb,
.sidebar::-webkit-scrollbar-thumb {
    background-color: #ccc;
    border-radius: 3px;
}

.chat-messages::-webkit-scrollbar-thumb:hover,
.sidebar::-webkit-scrollbar-thumb:hover {
    background-color: #aaa;
}

/* Loading States */
.processing {
    opacity: 0.6;
    pointer-events: none;
}

.btn:disabled {
    opacity: 0.5;
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        position: relative;
    }
    
    .main-content {
        height: calc(100vh - 350px);
    }
    
    .message-content {
        max-width: 85%;
    }
    
    .chat-input-container {
        padding: 1rem;
    }
    
    .welcome-icon {
        font-size: 3rem;
    }
    
    .welcome-title {
        font-size: 1.5rem;
    }
    
    .welcome-subtitle {
        font-size: 1rem;
    }
    
    .topics-section {
        display: none;
    }
    
    .brand-subtitle {
        display: none;
    }
}

/* Chat History Sidebar */
.chat-history-panel {
    background-color: var(--sidebar-bg);
    border-left: 1px solid var(--border-color);
    height: 100vh;
}

.chat-history-header {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
}

.chat-history-content {
    max-height: calc(100vh - 70px);
}

.chat-history-item {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.chat-history-item:hover {
    background-color: var(--hover-bg);
    border-color: var(--brand-color);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.chat-history-item.active {
    background-color: var(--brand-color);
    border-color: var(--accent-yellow);
}

.chat-preview {
    font-size: 0.9rem;
    color: var(--text-primary);
    margin-bottom: 4px;
    font-weight: 500;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.chat-date {
    font-size: 0.75rem;
    color: var(--text-muted);
}