:root {
    --primary-color: #10a37f;
    --primary-hover: #0d8f6c;
    --secondary-color: #f7f7f8;
    --text-color: #343541;
    --text-muted: #8e8ea0;
    --border-color: #e5e5e5;
    --sidebar-bg: #171717;
    --sidebar-text: #ececf1;
    --sidebar-text-secondary: #9ca3af;
    --sidebar-border: #374151;
    --user-bg: #e3f2fd;
    --bot-bg: #f5f5f5;
    --input-bg: #ffffff;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --ios-blue: #007AFF;
    --ios-gray: #8E8E93;
    --ios-bg: #1C1C1E;
}

* {
    box-sizing: border-box;
}

html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--secondary-color);
}

/* Sidebar Styles */
.sidebar-container {
    width: 280px;
    transition: all 0.3s ease;
}

.sidebar {
    height: 100vh;
    background-color: var(--sidebar-bg);
    color: var(--sidebar-text);
    padding: 1rem;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

/* Sidebar Overlay */
.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.9);
    z-index: 1030;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.sidebar-overlay.show {
    opacity: 1;
    visibility: visible;
}

/* iOS-style Sidebar Header */
.sidebar-header {
    flex-shrink: 0;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--sidebar-border);
    margin-bottom: 1rem;
}

.new-chat-btn {
    width: 100%;
    padding: 0.75rem 1rem;
    background: transparent;
    border: 1px solid var(--sidebar-border);
    border-radius: 12px;
    color: var(--sidebar-text);
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s ease;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.new-chat-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--sidebar-text-secondary);
}

.new-chat-btn i {
    font-size: 0.8rem;
}

/* iOS-style Search Container */
.search-container {
    margin-bottom: 0.5rem;
}

.search-input-wrapper {
    position: relative;
    width: 100%;
}

.search-icon {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--sidebar-text-secondary);
    font-size: 0.8rem;
    z-index: 1;
}

.search-input {
    width: 100%;
    padding: 0.6rem 0.75rem 0.6rem 2.25rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid transparent;
    border-radius: 8px;
    color: var(--sidebar-text);
    font-size: 0.85rem;
    transition: all 0.2s ease;
}

.search-input::placeholder {
    color: var(--sidebar-text-secondary);
}

.search-input:focus {
    outline: none;
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--ios-blue);
}

.sidebar-body {
    flex: 1;
    overflow-y: auto;
    padding-right: 0.25rem;
}

/* iOS-style Sidebar Footer */
.sidebar-footer {
    flex-shrink: 0;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--sidebar-border);
}

.sidebar-footer-actions {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.footer-action-btn {
    width: 100%;
    padding: 0.7rem 1rem;
    background: transparent;
    border: none;
    border-radius: 8px;
    color: var(--sidebar-text-secondary);
    font-size: 0.85rem;
    font-weight: 400;
    transition: all 0.2s ease;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-align: left;
}

.footer-action-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--sidebar-text);
}

.footer-action-btn i {
    font-size: 0.9rem;
    width: 1rem;
    text-align: center;
}

/* iOS-style Chat History Items */
.chat-history-item {
    padding: 0.75rem 1rem;
    margin: 0.125rem 0;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    background: transparent;
    color: var(--sidebar-text);
    text-align: left;
    width: 100%;
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.chat-history-item:hover {
    background-color: rgba(255, 255, 255, 0.08);
}

.chat-history-item.active {
    background-color: rgba(16, 163, 127, 0.15);
    border-left: 3px solid var(--primary-color);
    padding-left: calc(1rem - 3px);
}

.chat-title {
    font-size: 0.85rem;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin: 0;
    color: var(--sidebar-text);
    line-height: 1.3;
}

.chat-date {
    font-size: 0.7rem;
    color: var(--sidebar-text-secondary);
    margin: 0;
    font-weight: 400;
}

.chat-actions {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    opacity: 0;
    transition: opacity 0.2s ease;
}

.chat-history-item:hover .chat-actions {
    opacity: 1;
}

.btn-delete-chat {
    background: none;
    border: none;
    color: var(--sidebar-text-secondary);
    padding: 0.25rem;
    border-radius: 4px;
    transition: all 0.2s ease;
    width: 1.5rem;
    height: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-delete-chat:hover {
    background: rgba(220, 53, 69, 0.1);
    color: #dc3545;
}

/* iOS-style Hamburger Toggle */
.sidebar-toggle {
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 1060;
    width: 40px;
    height: 40px;
    background: rgba(128, 128, 128, 0.2);
    backdrop-filter: blur(10px);
    border: none;
    border-radius: 20px;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sidebar-toggle:hover {
    background: rgba(128, 128, 128, 0.3);
}

.sidebar-toggle.sidebar-open {
    left: calc(80vw + 1rem);
    background: rgba(0, 0, 0, 0.3);
}

.hamburger-lines {
    display: flex;
    flex-direction: column;
    width: 18px;
    height: 12px;
    justify-content: space-between;
    position: relative;
}

.hamburger-lines span {
    width: 100%;
    height: 2px;
    background-color: #666;
    border-radius: 1px;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    display: block;
}

.sidebar-toggle.sidebar-open .hamburger-lines span {
    background-color: #fff;
}

.sidebar-toggle.sidebar-open .hamburger-lines span:nth-child(1) {
    transform: rotate(45deg) translate(0, 6px);
}

.sidebar-toggle.sidebar-open .hamburger-lines span:nth-child(2) {
    opacity: 0;
}

.sidebar-toggle.sidebar-open .hamburger-lines span:nth-child(3) {
    transform: rotate(-45deg) translate(0, -6px);
}

@media (max-width: 992px) {
    .sidebar-toggle {
        top: 0.75rem;
        left: 0.75rem;
    }
    
    .sidebar-toggle.sidebar-open {
        left: calc(80vw + 0.75rem);
    }
    
    .chat-header {
        padding-left: 4rem !important;
    }
    

}

@media (max-width: 576px) {
    .sidebar-toggle {
        top: 0.5rem;
        left: 0.5rem;
        width: 36px;
        height: 36px;
    }
    
    .sidebar-toggle.sidebar-open {
        left: calc(80vw + 0.5rem);
    }
    
    .chat-header {
        padding-left: 3.5rem !important;
    }
    
    .hamburger-lines {
        width: 16px;
        height: 10px;
    }
}

/* Main Content */
.main-content {
    display: flex;
    flex-direction: column;
    height: 100vh;
    background-color: #ffffff;
}

.chat-container {
    display: flex;
    flex-direction: column;
    height: 100%;
}

/* Chat Header */
.chat-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    background-color: #ffffff;
    flex-shrink: 0;
}

.form-check-input:checked {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

/* Chat Messages */
.chat-messages {
    flex: 1;
    padding: 1rem 1.5rem;
    overflow-y: auto;
    background-color: #ffffff;
}

.welcome-message {
    margin-top: 2rem;
}

.welcome-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.message {
    margin-bottom: 1.5rem;
    display: flex;
    align-items: flex-start;
}

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

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 1.2rem;
    margin: 0 0.75rem;
}

.message.user .message-avatar {
    background-color: var(--primary-color);
    color: white;
}

.message.bot .message-avatar {
    background-color: var(--bot-bg);
    color: var(--text-color);
}

.message-content {
    max-width: 80%;
    padding: 1rem 1.25rem;
    border-radius: 1rem;
    position: relative;
    word-wrap: break-word;
}

.message.user .message-content {
    background-color: var(--primary-color);
    color: white;
    border-bottom-right-radius: 0.25rem;
}

.message.bot .message-content {
    background-color: var(--bot-bg);
    color: var(--text-color);
    border-bottom-left-radius: 0.25rem;
}

.message-time {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

.message.user .message-time {
    color: rgba(255, 255, 255, 0.8);
}

/* Web Search Indicator */
.web-search-indicator {
    display: inline-flex;
    align-items: center;
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
    padding: 0.25rem 0.5rem;
    border-radius: 0.5rem;
    background-color: rgba(16, 163, 127, 0.1);
    color: var(--primary-color);
}

.web-search-indicator i {
    margin-right: 0.5rem;
}

/* Feedback Buttons */
.feedback-buttons {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.75rem;
    margin-bottom: 0.5rem;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.message.bot:hover .feedback-buttons {
    opacity: 1;
}

/* Streaming Styles */
.message.streaming .message-content {
    position: relative;
}

.streaming-cursor {
    display: inline-block;
    width: 2px;
    height: 1.2em;
    background-color: var(--primary-color);
    margin-left: 2px;
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}



.feedback-btn {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.375rem 0.75rem;
    cursor: pointer;
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.375rem;
    transition: all 0.2s ease;
    min-width: auto;
}

.feedback-btn:hover {
    background-color: var(--secondary-color);
    color: var(--text-color);
}

.feedback-btn.liked {
    background-color: #d4edda;
    border-color: #28a745;
    color: #155724;
}

.feedback-btn.disliked {
    background-color: #f8d7da;
    border-color: #dc3545;
    color: #721c24;
}

.feedback-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.feedback-btn i {
    font-size: 0.75rem;
}

/* Chat Input */
.chat-input {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
    background-color: #ffffff;
    flex-shrink: 0;
}

.chat-input .input-group {
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.chat-input textarea {
    border: none;
    padding: 1rem 1.25rem;
    font-size: 1rem;
    min-height: 50px;
    max-height: 150px;
}

.chat-input textarea:focus {
    box-shadow: none;
    outline: none;
}

.chat-input .btn {
    border: none;
    padding: 0 1.25rem;
    transition: all 0.2s ease;
}

.chat-input .btn:hover {
    transform: translateY(-1px);
}

/* Status Indicator */
.status-indicator {
    display: flex;
    align-items: center;
    margin-top: 0.75rem;
    color: var(--text-muted);
}

.typing-indicator {
    display: flex;
    margin-right: 0.75rem;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--primary-color);
    margin: 0 2px;
    animation: typing 1.4s infinite ease-in-out;
}

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

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

@keyframes typing {
    0%, 80%, 100% {
        transform: scale(0.8);
        opacity: 0.5;
    }
    40% {
        transform: scale(1);
        opacity: 1;
    }
}

.status-text {
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 992px) {
    .sidebar-container {
        position: fixed;
        top: 0;
        left: -80vw;
        width: 80vw;
        z-index: 1040;
        height: 100vh;
    }
    
    .sidebar-container.show {
        left: 0;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .chat-header,
    .chat-messages,
    .chat-input {
        padding-left: 1rem;
        padding-right: 1rem;
    }
    
    .message-content {
        max-width: 90%;
    }
}

@media (max-width: 576px) {
    .sidebar {
        padding: 0.75rem;
    }
    
    .sidebar-container {
        width: 80vw;
        left: -80vw;
    }
    
    .chat-header {
        padding: 0.75rem 1rem;
    }
    
    .chat-messages {
        padding: 0.75rem 1rem;
    }
    
    .chat-input {
        padding: 0.75rem 1rem;
    }
    
    .message-content {
        max-width: 95%;
        padding: 0.75rem 1rem;
    }
    
    .message-avatar {
        width: 35px;
        height: 35px;
        margin: 0 0.5rem;
    }
}

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

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

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.sidebar-body::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
}

.chat-messages::-webkit-scrollbar-thumb:hover,
.sidebar-body::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Utility Classes */
.fade-in {
    animation: fadeIn 0.3s ease-in;
}

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

/* Streaming Effect */
.message.bot .message-content {
    transition: all 0.1s ease;
}

.message.bot.streaming .message-content {
    position: relative;
}

.message.bot.streaming .message-content::after {
    content: '▋';
    display: inline-block;
    animation: blink 1s infinite;
    color: var(--primary-color);
    font-weight: bold;
    margin-left: 2px;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

/* Smooth word transitions */
.message.bot .message-content {
    word-wrap: break-word;
    white-space: pre-wrap;
    line-height: 1.6;
}

/* Professional formatting for bot responses */
.message.bot .message-content {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.7;
    color: #374151;
}

.message.bot .message-content h1,
.message.bot .message-content h2,
.message.bot .message-content h3,
.message.bot .message-content h4 {
    margin: 1.5rem 0 0.75rem 0;
    font-weight: 600;
    color: #111827;
}

.message.bot .message-content h1 { font-size: 1.5rem; }
.message.bot .message-content h2 { font-size: 1.25rem; }
.message.bot .message-content h3 { font-size: 1.125rem; }
.message.bot .message-content h4 { font-size: 1rem; }

.message.bot .message-content p {
    margin: 0.75rem 0;
    line-height: 1.7;
}

.message.bot .message-content ul,
.message.bot .message-content ol {
    margin: 0.75rem 0;
    padding-left: 1.5rem;
}

.message.bot .message-content li {
    margin: 0.5rem 0;
    line-height: 1.6;
}

.message.bot .message-content strong {
    font-weight: 600;
    color: #111827;
}

.message.bot .message-content em {
    font-style: italic;
    color: #6b7280;
}

.message.bot .message-content blockquote {
    border-left: 4px solid #e5e7eb;
    padding-left: 1rem;
    margin: 1rem 0;
    color: #6b7280;
    font-style: italic;
}

.message.bot .message-content code {
    background-color: #f3f4f6;
    padding: 0.125rem 0.25rem;
    border-radius: 0.25rem;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    font-size: 0.875rem;
}

.message.bot .message-content pre {
    background-color: #f9fafb;
    border: 1px solid #e5e7eb;
    border-radius: 0.5rem;
    padding: 1rem;
    overflow-x: auto;
    margin: 1rem 0;
}

.message.bot .message-content pre code {
    background: none;
    padding: 0;
    border-radius: 0;
}

/* Table styling */
.message.bot .message-content table {
    border-collapse: collapse;
    width: 100%;
    margin: 1.5rem 0;
    font-size: 0.875rem;
    border-radius: 0.5rem;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    border: 1px solid #e5e7eb;
}

.message.bot .message-content th,
.message.bot .message-content td {
    border: 1px solid #e5e7eb;
    padding: 0.75rem;
    text-align: left;
    vertical-align: top;
}

.message.bot .message-content th {
    background-color: #f8fafc;
    font-weight: 600;
    color: #1f2937;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.message.bot .message-content td {
    background-color: #ffffff;
    color: #374151;
}

.message.bot .message-content tr:nth-child(even) td {
    background-color: #f9fafb;
}

.message.bot .message-content tr:hover td {
    background-color: #f3f4f6;
}

/* Responsive table */
@media (max-width: 768px) {
    .message.bot .message-content table {
        font-size: 0.75rem;
    }
    
    .message.bot .message-content th,
    .message.bot .message-content td {
        padding: 0.5rem;
    }
}

.slide-in {
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        transform: translateX(-100%);
    }
    to {
        transform: translateX(0);
    }
}