* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Inter', sans-serif;
    background: #f8fafc;
    min-height: 100vh;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

#mode-selector {
    width: 90%;
    max-width: 900px;
    margin-top: 20px;
    margin-bottom: 20px;
    display: flex;
    gap: 10px;
    justify-content: center;
}

#chat-controls {
    width: 90%;
    max-width: 900px;
    display: flex;
    justify-content: flex-end;
    align-items: center;
    margin-bottom: 10px;
    padding: 0 5px;
}

#clear-data-container {
    display: flex;
    align-items: center;
}



.mode-btn {
    background: #ffffff;
    border: 1.5px solid #e2e8f0;
    border-radius: 12px;
    padding: 10px 20px;
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    font-weight: 500;
    color: #64748b;
    cursor: pointer;
    transition: all 0.25s ease;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
    min-width: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.mode-btn svg {
    width: 18px;
    height: 18px;
    stroke-width: 2;
}

.mode-btn span {
    display: inline-block;
}

.mode-btn:hover {
    border-color: #3b82f6;
    color: #3b82f6;
}

/* Removed math-mode specific styling - all buttons use same style */

/* Streaming Chat Styles */
.message.streaming {
    animation: slideInBot 0.3s ease-out;
}

.streaming-content {
    display: block;
    min-height: 1.4em;
}

.streaming-cursor {
    display: inline-block;
    width: 2px;
    height: 1.1em;
    background: #3b82f6;
    margin-left: 2px;
    vertical-align: text-bottom;
    animation: cursorBlink 0.8s steps(2) infinite;
}

@keyframes cursorBlink {
    0% { opacity: 1; }
    50% { opacity: 0; }
    100% { opacity: 1; }
}

/* Typing indicator styles removed - streaming handles real-time display */

/* Streaming message animations */
@keyframes slideInBot {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes slideInUser {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Apply animations to messages */
.user-message {
    animation: slideInUser 0.3s ease-out;
}

.bot-message {
    animation: slideInBot 0.3s ease-out;
}

/* Streaming text cursor handled by .streaming-cursor element */

/* Error message styles */
.error-message {
    color: #ef4444;
    font-weight: 500;
}

/* Enhanced message appearance */
.message-text {
    line-height: 1.6;
    word-wrap: break-word;
}

/* Smooth scrolling for chat box */
#chat-box {
    scroll-behavior: smooth;
}

/* Loading states */
.btn-loading {
    position: relative;
    color: transparent !important;
}

.btn-loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid #ffffff;
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 1s infinite linear;
}

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

/* Disable send button during streaming */
.send-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    background: #94a3b8;
}

/* Status indicators */
.streaming-status {
    font-size: 12px;
    color: #64748b;
    font-style: italic;
    margin-top: 4px;
}

/* Enhanced message styling - ChatGPT style */
.message {
    margin-bottom: 8px; /* Kurangi jarak antar bubble */
    display: flex;
    flex-direction: column;
    max-width: 100%;
}

.message-content {
    max-width: 85%;
    position: relative;
    word-wrap: break-word;
    overflow-wrap: break-word; /* Better word breaking */
}

.user-message {
    align-items: flex-end;
    margin-bottom: 12px; /* Jarak setelah user message */
}

.user-message .message-content {
    background: #f3f4f6;
    color: #1f2937;
    border-radius: 18px 18px 4px 18px;
    padding: 10px 14px; /* Kurangi padding untuk lebih compact */
    margin-left: auto;
    border: 1px solid #e5e7eb;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
    font-size: 15px; /* Perbesar font user message */
}

.bot-message {
    align-items: flex-start;
    margin-bottom: 12px; /* Jarak setelah bot message */
}

.bot-message .message-content {
    background: transparent;
    color: #1f2937;
    border-radius: 0;
    padding: 8px 0; /* Kurangi padding vertikal */
    border: none;
    box-shadow: none;
    line-height: 1.6;
    font-size: 15px; /* Perbesar font bot message */
}

.message-text {
    line-height: 1.6;
    word-wrap: break-word;
    overflow-wrap: break-word;
    margin-bottom: 4px;
    white-space: pre-wrap; /* Preserve line breaks and spacing */
    font-size: 15px; /* Base font size untuk semua message text */
}

/* Bot response formatting improvements */
.bot-message .message-text {
    white-space: pre-wrap; /* Preserve formatting from AI */
    word-break: break-word;
    overflow-wrap: break-word;
}

.bot-message .message-text p {
    margin: 0 0 6px 0; /* Compact paragraph spacing */
    line-height: 1.5;
}

.bot-message .message-text p:last-child {
    margin-bottom: 0; /* Remove margin from last paragraph */
}

.bot-message .message-text ul,
.bot-message .message-text ol {
    margin: 6px 0;
    padding-left: 18px;
}

.bot-message .message-text li {
    margin-bottom: 1px; /* Very compact list item spacing */
    line-height: 1.4;
    padding-left: 2px;
}

.bot-message .message-text h1,
.bot-message .message-text h2,
.bot-message .message-text h3,
.bot-message .message-text h4,
.bot-message .message-text h5,
.bot-message .message-text h6 {
    margin: 10px 0 4px 0; /* Compact heading spacing */
    line-height: 1.2;
    font-weight: 600;
}

.bot-message .message-text h1 { font-size: 1.4em; }
.bot-message .message-text h2 { font-size: 1.3em; }
.bot-message .message-text h3 { font-size: 1.2em; }
.bot-message .message-text h4 { font-size: 1.1em; }

.bot-message .message-text code {
    background: #f1f5f9;
    padding: 1px 3px;
    border-radius: 3px;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.9em;
    color: #d63384;
}

.bot-message .message-text pre {
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 4px;
    padding: 8px 10px;
    margin: 6px 0;
    overflow-x: auto;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.85em;
    line-height: 1.3;
}

.bot-message .message-text pre code {
    background: none;
    padding: 0;
    color: inherit;
}

.bot-message .message-text blockquote {
    border-left: 3px solid #e2e8f0;
    padding-left: 10px;
    margin: 6px 0;
    color: #64748b;
    font-style: italic;
}

.bot-message .message-text strong {
    font-weight: 600;
}

.bot-message .message-text em {
    font-style: italic;
}

/* Improve spacing for numbered/bullet lists */
.bot-message .message-text ol {
    list-style-type: decimal;
}

.bot-message .message-text ul {
    list-style-type: disc;
}

.bot-message .message-text ol li,
.bot-message .message-text ul li {
    margin-left: 0;
    padding-left: 0;
}

.message-time {
    font-size: 11px;
    opacity: 0.7;
    text-align: right;
    margin-top: 4px;
}

.user-message .message-time {
    color: #6b7280;
}

.bot-message .message-time {
    color: #6b7280;
    text-align: left;
}

.mode-btn.active {
    background: #3b82f6;
    border-color: #3b82f6;
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

#chat-container {
    width: 90%;
    max-width: 900px;
    height: 85vh;
    max-height: 700px;
    background: #ffffff;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    margin: 0 auto;
    position: relative;
}

/* Mode indicator */
#chat-container::before {
    content: attr(data-mode);
    position: absolute;
    top: 10px;
    right: 15px;
    background: #e2e8f0;
    color: #64748b;
    padding: 4px 8px;
    border-radius: 8px;
    font-size: 11px;
    font-weight: 500;
    z-index: 10;
    pointer-events: none;
    opacity: 0.8;
}

#chat-box {
    flex: 1;
    padding: 16px 20px;
    overflow-y: auto;
    background: #ffffff;
    scroll-behavior: smooth;
}

#chat-box::-webkit-scrollbar {
    width: 6px;
}

#chat-box::-webkit-scrollbar-track {
    background: #f1f1f1;
}

#chat-box::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 3px;
}

.user, .bot {
    margin: 12px 0;
    padding: 12px 16px;
    border-radius: 18px;
    max-width: 85%;
    word-wrap: break-word;
    position: relative;
    animation: fadeIn 0.3s ease-out;
    font-size: 15px;
    line-height: 1.5;
}

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

/* ChatGPT-style Mathematics and Markdown Rendering */
.bot-message .message-content {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #1f2937;
}

/* Reduce excessive spacing between elements */
.bot-message .message-content > * {
    margin-top: 0;
    margin-bottom: 12px;
}

.bot-message .message-content > *:first-child {
    margin-top: 0;
}

.bot-message .message-content > *:last-child {
    margin-bottom: 0;
}

/* Headers */
.bot-message h1, .bot-message h2, .bot-message h3, .bot-message h4, .bot-message h5, .bot-message h6 {
    font-weight: 600;
    margin: 12px 0 6px 0;
    color: #111827;
}

.bot-message h1 { font-size: 1.5em; }
.bot-message h2 { font-size: 1.3em; }
.bot-message h3 { font-size: 1.1em; }

/* Bold text */
.bot-message strong, .bot-message b {
    font-weight: 600;
    color: #111827;
}

/* Italic text */
.bot-message em, .bot-message i {
    font-style: italic;
}

/* Horizontal rules (section separators) */
.bot-message hr {
    border: none;
    border-top: 1px solid #e5e7eb;
    margin: 16px 0;
    opacity: 0.6;
}

/* Inline code */
.bot-message code {
    background: #f3f4f6;
    color: #1f2937;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.85em;
}

/* Code block wrapper */
.code-block-wrapper {
    position: relative;
    margin: 14px 0;
    border-radius: 8px;
    overflow: hidden;
    background: #1e1e2e;
}

.code-block-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 12px;
    background: #181825;
    border-bottom: 1px solid #313244;
}

.code-lang {
    font-family: 'Inter', sans-serif;
    font-size: 12px;
    color: #a6adc8;
    text-transform: lowercase;
    font-weight: 500;
}

.code-copy-btn {
    display: flex;
    align-items: center;
    gap: 4px;
    background: transparent;
    border: none;
    color: #a6adc8;
    font-family: 'Inter', sans-serif;
    font-size: 12px;
    cursor: pointer;
    padding: 2px 8px;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.code-copy-btn:hover {
    background: #313244;
    color: #cdd6f4;
}

.code-copy-btn.copied {
    color: #a6e3a1;
}

.code-copy-btn svg {
    width: 14px;
    height: 14px;
}

/* Fenced code blocks inside wrapper */
.code-block-wrapper pre {
    background: #1e1e2e;
    margin: 0;
    padding: 14px 16px;
    overflow-x: auto;
    border: none;
    border-radius: 0;
}

.code-block-wrapper pre code {
    background: none;
    color: #cdd6f4;
    padding: 0;
    border-radius: 0;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', 'Fira Code', monospace;
    font-size: 0.85em;
    line-height: 1.6;
}

/* Fallback for bare pre/code (not wrapped) */
.bot-message pre {
    background: #1e1e2e;
    border: 1px solid #313244;
    border-radius: 8px;
    padding: 14px 16px;
    overflow-x: auto;
    margin: 12px 0;
}

.bot-message pre code {
    background: none;
    color: #cdd6f4;
    padding: 0;
    border-radius: 0;
    font-size: 0.85em;
    line-height: 1.6;
}

/* Lists */
.bot-message ul, .bot-message ol {
    margin: 12px 0;
    padding-left: 20px;
}

.bot-message li {
    margin: 4px 0;
}

/* Blockquotes */
.bot-message blockquote {
    border-left: 4px solid #3b82f6;
    padding-left: 16px;
    margin: 12px 0;
    color: #6b7280;
    font-style: italic;
}

/* Links */
.bot-message a {
    color: #3b82f6;
    text-decoration: none;
}

.bot-message a:hover {
    text-decoration: underline;
}

/* Mathematics styling */
.MathJax {
    font-size: 1.1em !important;
}

/* Inline math */
.MathJax_Display {
    margin: 12px 0 !important;
    text-align: center;
}

/* Math blocks with boxed answers */
.bot-message .math-boxed {
    background: #f0f9ff;
    border: 2px solid #3b82f6;
    border-radius: 8px;
    padding: 12px;
    margin: 16px 0;
    text-align: center;
    font-weight: 600;
}

/* Step-by-step solution styling */
.bot-message .solution-step {
    margin: 12px 0;
    padding: 8px 0;
}

.bot-message .solution-step:not(:last-child) {
    border-bottom: 1px solid #f3f4f6;
}

/* Answer highlighting */
.bot-message .answer-box {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
    padding: 12px 16px;
    border-radius: 8px;
    margin: 16px 0;
    text-align: center;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

/* Formula highlighting */
.bot-message .formula-highlight {
    background: #fef3c7;
    padding: 2px 4px;
    border-radius: 4px;
    border: 1px solid #f59e0b;
}

/* Table styling */
.bot-message table {
    border-collapse: collapse;
    width: 100%;
    margin: 12px 0;
    font-size: 0.9em;
}

.bot-message th, .bot-message td {
    border: 1px solid #e5e7eb;
    padding: 8px 12px;
    text-align: left;
}

.bot-message th {
    background: #f9fafb;
    font-weight: 600;
}

/* Ensure proper spacing between paragraphs */
.bot-message p {
    margin: 12px 0;
}

.bot-message p:first-child {
    margin-top: 0;
}

.bot-message p:last-child {
    margin-bottom: 0;
}

/* Special styling for mathematical expressions */
.math-expression {
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    padding: 8px 12px;
    margin: 8px 0;
    font-family: 'Times New Roman', serif;
    text-align: center;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .bot-message .message-content {
        font-size: 14px;
    }
    
    .MathJax {
        font-size: 1em !important;
    }
}

.user {
    background: #f3f4f6; /* Abu-abu seperti ChatGPT */
    color: #2d3748;
    margin-left: auto;
    border: 1px solid #e2e8f0;
}

.bot {
    background: transparent; /* Tanpa latar belakang seperti ChatGPT */
    color: #2d3748;
    margin-right: auto;
    line-height: 1.6;
    white-space: pre-line;
    padding: 12px 0;
}

/* Streaming cursor handled by .streaming-cursor element */

.bot br {
    line-height: 1.6;
}

/* Styling untuk user messages agar konsisten */
.user {
    line-height: 1.6;
    white-space: pre-line;
}

/* Typing indicator removed - streaming handles real-time display */

#input-container {
    display: flex;
    align-items: flex-end;
    padding: 16px 20px 20px;
    background: #ffffff;
    border-top: 1px solid #f0f0f0;
    gap: 12px;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
}

#user-input {
    flex: 1;
    padding: 14px 18px;
    border: 1px solid #e2e8f0;
    border-radius: 22px;
    font-size: 16px;
    font-family: 'Inter', sans-serif;
    transition: all 0.2s ease;
    resize: none;
    overflow-y: auto;
    min-height: 48px;
    max-height: 120px;
    line-height: 1.5;
    word-wrap: break-word;
    white-space: pre-wrap;
    background: #fafafa;
}

/* Custom scrollbar untuk textarea seperti WhatsApp */
#user-input::-webkit-scrollbar {
    width: 4px;
}

#user-input::-webkit-scrollbar-track {
    background: transparent;
}

#user-input::-webkit-scrollbar-thumb {
    background: #cbd5e0;
    border-radius: 2px;
}

#user-input::-webkit-scrollbar-thumb:hover {
    background: #a0aec0;
}

#user-input:focus {
    outline: none;
    border-color: #4a90e2;
    background: #ffffff;
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

#user-input::placeholder {
    color: #a0aec0;
    font-size: 15px;
}

#clear-btn {
    background: #f8fafc;
    color: #64748b;
    border: 1.5px solid #e2e8f0;
    padding: 0;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    height: 44px;
    width: 44px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

#clear-btn svg {
    width: 20px;
    height: 20px;
    stroke-width: 2;
}

#clear-btn:hover {
    background: #fef2f2;
    border-color: #fecaca;
    color: #ef4444;
}

#clear-btn:active {
    transform: scale(0.95);
}

/* Icon Button Base Styles */
.icon-btn {
    background: #f8fafc;
    color: #64748b;
    border: 1.5px solid #e2e8f0;
    padding: 0;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    height: 44px;
    width: 44px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-btn svg {
    width: 20px;
    height: 20px;
    stroke-width: 2;
}

.icon-btn:hover {
    background: #f1f5f9;
    border-color: #cbd5e1;
    color: #475569;
}

.icon-btn:active {
    transform: scale(0.95);
}

/* Small Icon Button */
.icon-btn-small {
    background: rgba(0, 0, 0, 0.5);
    color: #fff;
    border: none;
    padding: 0;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s ease;
    height: 24px;
    width: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    top: 4px;
    right: 4px;
}

.icon-btn-small svg {
    width: 14px;
    height: 14px;
    stroke-width: 2.5;
}

.icon-btn-small:hover {
    background: rgba(239, 68, 68, 0.9);
}

#clear-cache-btn {
    background: #f8fafc;
    color: #64748b;
    border: 1.5px solid #e2e8f0;
    padding: 0;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    height: 44px;
    width: 44px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

#clear-cache-btn svg {
    width: 20px;
    height: 20px;
    stroke-width: 2;
}

#clear-cache-btn:hover {
    background: #fef2f2;
    border-color: #fecaca;
    color: #ef4444;
}

#send-btn {
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    color: #ffffff;
    border: none;
    padding: 0;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    height: 44px;
    width: 44px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
}

#send-btn svg {
    width: 20px;
    height: 20px;
    stroke-width: 2;
}

#send-btn:hover {
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
    transform: translateY(-1px);
}

#send-btn:active {
    transform: scale(0.95) translateY(0);
}

#send-btn:disabled {
    background: #94a3b8;
    box-shadow: none;
    cursor: not-allowed;
}

/* Image Upload Button */
#image-btn {
    background: #f8fafc;
    color: #64748b;
    border: 1.5px solid #e2e8f0;
    padding: 0;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    height: 44px;
    width: 44px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

#image-btn svg {
    width: 20px;
    height: 20px;
    stroke-width: 2;
}

#image-btn:hover {
    background: #eff6ff;
    border-color: #93c5fd;
    color: #3b82f6;
}

/* Media query untuk desktop besar */
@media (min-width: 1200px) {
    #chat-container {
        max-width: 1000px;
        height: 80vh;
        max-height: 800px;
    }

    #chat-box {
        padding: 24px 28px;
    }

    #input-container {
        padding: 20px 28px 24px;
    }

    .user, .bot {
        font-size: 16px;
        max-width: 80%;
    }
}

@media (max-width: 768px) {
    body {
        background: #ffffff;
        padding: 0;
        align-items: stretch;
        justify-content: stretch;
    }

    #chat-controls {
        width: 100%;
        padding: 10px 16px;
        margin-bottom: 0;
    }

    #clear-cache-btn {
        height: 40px;
        min-width: 80px;
        font-size: 13px;
        padding: 6px 10px;
    }

    #chat-container {
        width: 100%;
        height: 100vh;
        max-width: none;
        max-height: none;
        border-radius: 0;
        box-shadow: none;
        margin: 0;
    }

    #chat-box {
        padding: 16px;
    }

    #input-container {
        padding: 16px;
    }

    #user-input {
        font-size: 16px;
        padding: 12px 16px;
        min-height: 44px;
        max-height: 100px;
    }

    #clear-btn {
        height: 44px;
        width: 44px;
        font-size: 15px;
    }

    #send-btn {
        height: 44px;
        padding: 12px 18px;
        min-width: 65px;
        font-size: 15px;
    }

    .user, .bot {
        max-width: 90%;
        font-size: 14px;
    }

    /* Typing indicator removed */
}

/* Media query untuk device sangat kecil */
@media (max-width: 480px) {
    body {
        background: #ffffff;
        padding: 0;
        align-items: stretch;
        justify-content: stretch;
    }

    #chat-controls {
        width: 100%;
        padding: 8px 12px;
        margin-bottom: 0;
        flex-direction: column;
        gap: 10px;
        align-items: stretch;
    }

    #clear-data-container {
        justify-content: center;
    }

    #clear-cache-btn {
        height: 36px;
        min-width: 100px;
        font-size: 12px;
        padding: 6px 8px;
    }

    #chat-container {
        width: 100%;
        height: 100vh;
        max-width: none;
        max-height: none;
        border-radius: 0;
        box-shadow: none;
        margin: 0;
    }

    #chat-box {
        padding: 12px;
    }

    #input-container {
        padding: 12px;
        gap: 10px;
    }

    #user-input {
        font-size: 16px;
        padding: 10px 14px;
        min-height: 40px;
        max-height: 80px;
        border-radius: 20px;
    }

    #clear-btn {
        height: 40px;
        width: 40px;
        font-size: 14px;
        border-radius: 20px;
    }

    #clear-cache-btn {
        height: 40px;
        min-width: 70px;
        font-size: 11px;
        border-radius: 20px;
        padding: 6px 8px;
    }

    #send-btn {
        height: 40px;
        padding: 10px 14px;
        min-width: 60px;
        border-radius: 20px;
        font-size: 13px;
    }

    .user, .bot {
        padding: 10px 14px;
        max-width: 92%;
        font-size: 14px;
        border-radius: 16px;
        margin: 8px 0;
    }

    /* Typing indicator removed */
}

/* OCR Progress Bar */
#ocr-progress {
    display: none;
    padding: 16px 20px;
    background: #fafafa;
    border-top: 1px solid #f0f0f0;
}

.progress-container {
    display: flex;
    align-items: center;
    gap: 14px;
}

.progress-info {
    min-width: 120px;
}

.progress-text {
    font-size: 13px;
    color: #6b7280;
    margin-bottom: 3px;
}

.progress-percentage {
    font-size: 15px;
    font-weight: 600;
    color: #2d3748;
}

/* Image Preview Styles */
#image-preview-container {
    position: relative;
    margin-bottom: 12px;
    max-width: 300px;
}

#image-preview {
    max-width: 100%;
    max-height: 200px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    display: block;
}

#remove-image {
    position: absolute;
    top: -8px;
    right: -8px;
    background: #ef4444;
    color: white;
    border: none;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    cursor: pointer;
    font-size: 16px;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    transition: all 0.2s ease;
}

#remove-image:hover {
    background: #dc2626;
    transform: scale(1.1);
}

#image-btn {
    background: #8b5cf6;
    color: white;
    border: none;
    border-radius: 8px;
    padding: 12px;
    cursor: pointer;
    font-size: 15px;
    transition: all 0.3s ease;
    margin-right: 8px;
}

#image-btn:hover {
    background: #7c3aed;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.3);
}

#image-btn:disabled {
    background: #9ca3af;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* Drag and drop styles */
#user-input.drag-over {
    border-color: #8b5cf6;
    background-color: #f3f4f6;
}

/* Math mode specific styling */
.math-mode-indicator {
    position: absolute;
    top: -30px;
    left: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
}

#input-container {
    position: relative;
}

.progress-bar {
    flex: 1;
    height: 8px;
    background: #e2e8f0;
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #4a90e2, #357abd);
    width: 0%;
    transition: width 0.4s ease;
}

/* Enhanced Mathematical Formatting Classes */
.choice-option {
    margin: 8px 0;
    padding: 8px 12px;
    background: #f8fafc;
    border-left: 3px solid #3b82f6;
    border-radius: 4px;
}

.choice-option strong {
    color: #1e40af;
    margin-right: 8px;
}

.solution-step {
    margin: 12px 0;
    padding: 10px 16px;
    background: #fef3c7;
    border-left: 4px solid #f59e0b;
    border-radius: 6px;
    font-weight: 500;
}

.answer-section {
    margin: 16px 0;
    padding: 12px 16px;
    background: #dcfce7;
    border: 2px solid #16a34a;
    border-radius: 8px;
    font-weight: 600;
    position: relative;
}

.solution-section {
    margin: 16px 0;
    padding: 12px 16px;
    background: #eff6ff;
    border: 2px solid #2563eb;
    border-radius: 8px;
    font-weight: 600;
}

.math-equation {
    margin: 12px 0;
    padding: 8px 12px;
    background: #f1f5f9;
    border-radius: 6px;
    font-family: 'Courier New', monospace;
    text-align: center;
}

.conclusion {
    margin: 16px 0;
    padding: 12px 16px;
    background: #fdf2f8;
    border: 2px solid #be185d;
    border-radius: 8px;
    font-weight: 600;
    color: #be185d;
}

.answer-box {
    display: inline-block;
    margin: 4px 8px;
    padding: 8px 16px;
    background: #1e40af;
    color: white;
    border-radius: 8px;
    font-weight: bold;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* Question Type Styling */
.question-type {
    margin: 8px 0 16px 0;
    padding: 8px 12px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 8px;
    font-weight: 600;
    font-size: 14px;
}

/* Problem Statement Styling */
.problem-statement {
    margin: 12px 0;
    padding: 12px 16px;
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    border-left: 4px solid #6366f1;
}

.problem-statement strong {
    color: #1e40af;
    font-size: 16px;
}

/* Solution Steps Container */
.solution-steps {
    margin: 16px 0;
}

.solution-steps h4 {
    color: #1f2937;
    margin-bottom: 12px;
    font-size: 16px;
    font-weight: 600;
}

/* Step-by-step styling */
.step-item {
    margin: 10px 0;
    padding: 12px 16px;
    background: #fef9e7;
    border-left: 4px solid #eab308;
    border-radius: 6px;
    position: relative;
}

.step-number {
    display: inline-block;
    width: 24px;
    height: 24px;
    background: #eab308;
    color: white;
    border-radius: 50%;
    text-align: center;
    line-height: 24px;
    font-weight: bold;
    font-size: 12px;
    margin-right: 8px;
}

/* Final Answer Styling */
.final-answer {
    margin: 20px 0;
    padding: 16px 20px;
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
    border-radius: 12px;
    font-weight: 700;
    font-size: 16px;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
    position: relative;
}

.final-answer::before {
    content: "🎯";
    margin-right: 8px;
    font-size: 18px;
}

/* Explanation Box */
.explanation-box {
    margin: 16px 0;
    padding: 12px 16px;
    background: #f0f9ff;
    border: 1px solid #0ea5e9;
    border-radius: 8px;
    color: #0c4a6e;
}

.explanation-box strong {
    color: #0369a1;
}

/* Copy Button Styling */
.copy-btn {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0, 0, 0, 0.1);
    border: none;
    border-radius: 4px;
    padding: 4px 6px;
    cursor: pointer;
    font-size: 10px;
    color: #6b7280;
    transition: all 0.2s ease;
    opacity: 0;
    display: flex;
    align-items: center;
    gap: 2px;
}

.bot-message:hover .copy-btn {
    opacity: 1;
}

.copy-btn:hover {
    background: rgba(0, 0, 0, 0.2);
    color: #374151;
}

.copy-btn.copied {
    background: #10b981;
    color: white;
}

.copy-btn.copied::after {
    content: " ✓";
}

/* Math Expression Enhancements */
.MathJax {
    font-size: 1.1em !important;
}

/* Chat image styling */
.chat-image {
    max-width: 100%;
    max-height: 300px;
    border-radius: 8px;
    margin: 10px 0;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.chat-image:hover {
    transform: scale(1.02);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.image-info {
    margin-top: 8px;
}

.image-info small {
    color: #666;
    font-style: italic;
    font-size: 12px;
}

/* Image modal styling */
#image-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    cursor: pointer;
}

#image-modal img {
    max-width: 90%;
    max-height: 90%;
    border-radius: 8px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

/* Responsive layout */
@media (max-width: 768px) {
    .chat-image {
        max-height: 250px;
    }
}

/* Refined ChatGPT-like response layout */
.message {
    margin-bottom: 18px;
    display: flex;
    flex-direction: column;
    width: 100%;
}

.message-content {
    max-width: min(100%, 820px);
    width: fit-content;
}

.user-message {
    align-items: flex-end;
}

.user-message .message-content {
    background: #f3f4f6;
    color: #111827;
    border: 1px solid #e5e7eb;
    border-radius: 20px 20px 8px 20px;
    padding: 12px 16px;
    box-shadow: 0 1px 2px rgba(15, 23, 42, 0.06);
}

.user-message .message-text {
    white-space: pre-wrap;
    word-break: break-word;
    line-height: 1.6;
    font-size: 15px;
}

.bot-message {
    align-items: flex-start;
}

.bot-message .message-content {
    background: transparent;
    border: 0;
    border-radius: 0;
    box-shadow: none;
    color: #111827;
    padding: 0;
    max-width: min(100%, 820px);
    width: min(100%, 820px);
}

.assistant-response {
    width: 100%;
}

.assistant-response-body {
    color: #111827;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Inter, sans-serif;
    font-size: 15px;
    line-height: 1.75;
    word-break: break-word;
    overflow-wrap: anywhere;
}

.assistant-response-body > *:first-child {
    margin-top: 0;
}

.assistant-response-body > *:last-child {
    margin-bottom: 0;
}

.assistant-response-body p,
.assistant-response-body ul,
.assistant-response-body ol,
.assistant-response-body blockquote,
.assistant-response-body hr,
.assistant-response-body .table-scroll,
.assistant-response-body .math-block,
.assistant-response-body .code-block-wrapper {
    margin: 0.9rem 0;
}

.assistant-response-body h1,
.assistant-response-body h2,
.assistant-response-body h3,
.assistant-response-body h4 {
    margin: 1.35rem 0 0.7rem;
    color: #111827;
    line-height: 1.35;
    font-weight: 700;
}

.assistant-response-body h1 {
    font-size: 1.6rem;
}

.assistant-response-body h2 {
    font-size: 1.35rem;
}

.assistant-response-body h3 {
    font-size: 1.15rem;
}

.assistant-response-body h4 {
    font-size: 1rem;
}

.assistant-response-body ul,
.assistant-response-body ol {
    padding-left: 1.5rem;
}

.assistant-response-body li + li {
    margin-top: 0.35rem;
}

.assistant-response-body blockquote {
    border-left: 3px solid #93c5fd;
    background: #f8fafc;
    border-radius: 0 8px 8px 0;
    padding: 0.6rem 1rem;
    color: #475569;
}

.assistant-response-body blockquote p {
    margin: 0.35rem 0;
}

.assistant-response-body blockquote > *:first-child {
    margin-top: 0;
}

.assistant-response-body blockquote > *:last-child {
    margin-bottom: 0;
}

.assistant-response-body a {
    color: #2563eb;
    text-decoration: none;
}

.assistant-response-body a:hover {
    text-decoration: underline;
}

.assistant-response-body hr {
    border: 0;
    border-top: 1px solid #e5e7eb;
}

.assistant-response-body code {
    background: #f3f4f6;
    color: #111827;
    border: 1px solid #e5e7eb;
    border-radius: 6px;
    padding: 0.12rem 0.42rem;
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
    font-size: 0.9em;
}

.code-block-wrapper {
    border: 1px solid #dbe4f0;
    border-radius: 14px;
    overflow: hidden;
    background: #0f172a;
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.12);
}

.code-block-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 14px;
    background: #111827;
    border-bottom: 1px solid rgba(148, 163, 184, 0.2);
}

.code-lang {
    font-size: 12px;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: #cbd5e1;
}

.code-copy-btn {
    border: 1px solid rgba(148, 163, 184, 0.25);
    background: transparent;
    color: #e2e8f0;
    border-radius: 8px;
    padding: 6px 10px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.code-copy-btn:hover {
    background: rgba(148, 163, 184, 0.12);
    border-color: rgba(148, 163, 184, 0.45);
}

.code-copy-btn.copied {
    color: #bbf7d0;
}

.code-block-wrapper pre {
    margin: 0;
    padding: 16px;
    overflow-x: auto;
    background: #0f172a;
}

.code-block-wrapper pre code {
    border: 0;
    background: transparent;
    color: #e2e8f0;
    padding: 0;
    font-size: 0.9em;
    line-height: 1.65;
    white-space: pre;
}

.table-scroll {
    overflow-x: auto;
}

.assistant-response-body table {
    width: 100%;
    min-width: 420px;
    border-collapse: collapse;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid #e5e7eb;
}

.assistant-response-body th,
.assistant-response-body td {
    padding: 10px 12px;
    border-bottom: 1px solid #e5e7eb;
    text-align: left;
    vertical-align: top;
}

.assistant-response-body th {
    background: #f8fafc;
    font-weight: 700;
}

.assistant-response-body tr:last-child td {
    border-bottom: 0;
}

.message-toolbar {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 10px;
}

.message-meta {
    font-size: 12px;
    color: #6b7280;
}

.copy-btn {
    position: static;
    opacity: 1;
    border: 1px solid #e5e7eb;
    background: #ffffff;
    color: #4b5563;
    border-radius: 999px;
    padding: 6px 12px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.copy-btn:hover {
    background: #f8fafc;
    border-color: #cbd5e1;
    color: #111827;
}

.copy-btn.copied {
    background: #ecfdf5;
    border-color: #86efac;
    color: #166534;
}

.copy-btn.copied::after {
    content: '';
}

.streaming-indicator {
    display: flex;
    align-items: center;
    min-height: 1.4rem;
    margin-top: 2px;
}

.streaming-content {
    min-height: 1.6rem;
}

.streaming-cursor {
    width: 2px;
    height: 1.2em;
    margin-left: 1px;
    background: #2563eb;
}

.response-callout {
    padding: 0.8rem 1rem;
    border-radius: 12px;
    border: 1px solid #dbeafe;
    background: #eff6ff;
    color: #1e3a8a;
}

.math-inline {
    white-space: nowrap;
}

.math-block {
    overflow-x: auto;
    overflow-y: hidden;
    padding: 0.3rem 0;
}

.assistant-response-body mjx-container {
    max-width: 100%;
}

.assistant-response-body mjx-container[display="true"] {
    display: block;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 0.35rem 0;
    margin: 0.95rem 0 !important;
}

.assistant-response-body mjx-container[jax="CHTML"] {
    font-size: 1.02em !important;
}

@media (max-width: 768px) {
    .bot-message .message-content {
        width: 100%;
    }

    .assistant-response-body {
        font-size: 14px;
        line-height: 1.7;
    }

    .assistant-response-body table {
        min-width: 360px;
    }
}