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

:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #2a2a2a;
    --bg-hover: #333;
    --border-color: #404040;
    --text-primary: #ececec;
    --text-secondary: #b4b4b4;
    --accent: #10a37f;
    --accent-hover: #0d8a6a;
    --user-msg: #2f2f2f;
    --assistant-msg: #1a1a1a;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1a2e 50%, #0a0a0a 100%);
    background-attachment: fixed;
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
}

/* Animated background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(16, 163, 127, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(59, 130, 246, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
    animation: bgShift 15s ease infinite;
    pointer-events: none;
    z-index: 0;
}

@keyframes bgShift {
    0%, 100% { opacity: 0.5; transform: scale(1); }
    50% { opacity: 0.8; transform: scale(1.1); }
}

.app-container {
    display: flex;
    height: 100vh;
    position: relative;
    z-index: 1;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background: rgba(26, 26, 26, 0.95);
    backdrop-filter: blur(10px);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease;
}

.sidebar.collapsed {
    transform: translateX(-100%);
}

.sidebar-header {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
}

.new-chat-btn {
    width: 100%;
    padding: 12px 16px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: background 0.2s;
}

.new-chat-btn:hover {
    background: var(--accent-hover);
}

.conversations-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}

.conversation-item {
    padding: 12px;
    margin-bottom: 4px;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s;
    font-size: 14px;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.conversation-item:hover {
    background: var(--bg-hover);
}

.conversation-item.active {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.delete-conv-btn {
    opacity: 0;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    transition: opacity 0.2s;
}

.conversation-item:hover .delete-conv-btn {
    opacity: 1;
}

.delete-conv-btn:hover {
    color: #ff4444;
}

/* Main chat area */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
}

.chat-header {
    padding: 16px 24px;
    background: rgba(26, 26, 26, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 16px;
}

.toggle-sidebar-btn {
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: background 0.2s;
}

.toggle-sidebar-btn:hover {
    background: var(--bg-hover);
}

.model-selector {
    padding: 8px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
}

.model-selector:hover {
    border-color: var(--accent);
}

.model-selector:focus {
    outline: none;
    border-color: var(--accent);
}

/* Messages area */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    scroll-behavior: smooth;
}

.messages-container::-webkit-scrollbar {
    width: 8px;
}

.messages-container::-webkit-scrollbar-track {
    background: transparent;
}

.messages-container::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.messages-container::-webkit-scrollbar-thumb:hover {
    background: var(--bg-hover);
}

.message {
    margin-bottom: 24px;
    animation: messageSlideIn 0.3s ease;
}

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

.message-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
}

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

.message.assistant .message-avatar {
    background: linear-gradient(135deg, #10a37f 0%, #0d8a6a 100%);
}

.message-role {
    font-weight: 600;
    font-size: 14px;
}

.message-content {
    margin-left: 40px;
    padding: 16px;
    border-radius: 12px;
    line-height: 1.6;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.message.user .message-content {
    background: var(--user-msg);
}

.message.assistant .message-content {
    background: var(--assistant-msg);
}

.message-image {
    max-width: 400px;
    max-height: 400px;
    border-radius: 8px;
    margin-top: 12px;
    border: 1px solid var(--border-color);
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-secondary);
    text-align: center;
    padding: 24px;
}

.empty-state h1 {
    font-size: 32px;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #10a37f 0%, #3b82f6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.empty-state p {
    font-size: 16px;
    max-width: 500px;
    margin-bottom: 32px;
}

.starter-prompts {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 12px;
    max-width: 900px;
    width: 100%;
    margin-top: 24px;
}

.prompt-card {
    background: rgba(42, 42, 42, 0.6);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 12px;
    text-align: left;
}

.prompt-card:hover {
    background: rgba(42, 42, 42, 0.9);
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(16, 163, 127, 0.2);
}

.prompt-icon {
    font-size: 24px;
    flex-shrink: 0;
    filter: grayscale(0.3);
}

.prompt-card:hover .prompt-icon {
    filter: grayscale(0);
    transform: scale(1.1);
    transition: all 0.3s ease;
}

.prompt-text {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.4;
}

.prompt-card:hover .prompt-text {
    color: var(--text-primary);
}

/* Input area */
.input-container {
    padding: 24px;
    background: rgba(26, 26, 26, 0.95);
    backdrop-filter: blur(10px);
    border-top: 1px solid var(--border-color);
}

.input-wrapper {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.image-preview-container {
    margin-bottom: 12px;
    display: none;
}

.image-preview-container.active {
    display: block;
}

.image-preview {
    position: relative;
    display: inline-block;
}

.image-preview img {
    max-width: 200px;
    max-height: 200px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.remove-image-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    background: rgba(0, 0, 0, 0.8);
    border: none;
    color: white;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.remove-image-btn:hover {
    background: #ff4444;
}

.input-box {
    display: flex;
    gap: 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 12px;
    transition: border-color 0.2s;
}

.input-box:focus-within {
    border-color: var(--accent);
}

textarea {
    flex: 1;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 15px;
    resize: none;
    outline: none;
    font-family: inherit;
    max-height: 200px;
    min-height: 24px;
}

textarea::placeholder {
    color: var(--text-secondary);
}

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

.icon-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

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

.send-btn {
    background: var(--accent);
    color: white;
    padding: 8px 16px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: background 0.2s;
}

.send-btn:hover:not(:disabled) {
    background: var(--accent-hover);
}

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

.typing-indicator {
    display: none;
    margin-left: 40px;
    padding: 16px;
    background: var(--assistant-msg);
    border-radius: 12px;
    width: fit-content;
}

.typing-indicator.active {
    display: block;
}

.typing-dots {
    display: flex;
    gap: 4px;
}

.typing-dots span {
    width: 8px;
    height: 8px;
    background: var(--text-secondary);
    border-radius: 50%;
    animation: typingBounce 1.4s infinite;
}

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

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

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

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        position: absolute;
        height: 100%;
        z-index: 10;
    }
    
    .sidebar.collapsed {
        transform: translateX(-100%);
    }
}

/* Hidden file input */
#fileInput {
    display: none;
}

/* Markdown content styling */
.markdown-content {
    line-height: 1.7;
}

.markdown-content h1,
.markdown-content h2,
.markdown-content h3,
.markdown-content h4,
.markdown-content h5,
.markdown-content h6 {
    margin-top: 16px;
    margin-bottom: 8px;
    font-weight: 600;
    line-height: 1.25;
    color: var(--text-primary);
}

.markdown-content h1 {
    font-size: 1.5em;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 6px;
}

.markdown-content h2 {
    font-size: 1.3em;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 4px;
}

.markdown-content h3 {
    font-size: 1.15em;
}

.markdown-content h4 {
    font-size: 1em;
}

.markdown-content h5 {
    font-size: 0.875em;
}

.markdown-content h6 {
    font-size: 0.85em;
    color: var(--text-secondary);
}

.markdown-content p {
    margin-bottom: 12px;
}

.markdown-content ul,
.markdown-content ol {
    margin-bottom: 12px;
    padding-left: 24px;
}

.markdown-content li {
    margin-bottom: 4px;
}

.markdown-content li > p {
    margin-bottom: 4px;
}

.markdown-content code {
    background: rgba(255, 255, 255, 0.1);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.9em;
    color: #e06c75;
}

.markdown-content pre {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 12px;
    overflow-x: auto;
    position: relative;
}

.markdown-content pre code {
    background: none;
    padding: 0;
    color: var(--text-primary);
    font-size: 0.875em;
    line-height: 1.5;
}

.markdown-content blockquote {
    border-left: 4px solid var(--accent);
    padding-left: 16px;
    margin: 12px 0;
    color: var(--text-secondary);
    font-style: italic;
}

.markdown-content a {
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s;
}

.markdown-content a:hover {
    border-bottom-color: var(--accent);
}

.markdown-content table {
    border-collapse: collapse;
    width: 100%;
    margin-bottom: 12px;
}

.markdown-content table th,
.markdown-content table td {
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    text-align: left;
}

.markdown-content table th {
    background: rgba(255, 255, 255, 0.05);
    font-weight: 600;
}

.markdown-content table tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

.markdown-content hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 16px 0;
}

.markdown-content img {
    max-width: 100%;
    border-radius: 8px;
    margin: 12px 0;
}

.markdown-content strong {
    font-weight: 600;
    color: var(--text-primary);
}

.markdown-content em {
    font-style: italic;
}

/* Remove top margin from first element */
.markdown-content > *:first-child {
    margin-top: 0;
}

/* Remove bottom margin from last element */
.markdown-content > *:last-child {
    margin-bottom: 0;
}

/* Code block copy button */
.code-block-wrapper {
    position: relative;
    margin-bottom: 12px;
}

.code-block-wrapper pre {
    margin-bottom: 0;
}

.copy-code-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    cursor: pointer;
    opacity: 0;
    transition: all 0.2s;
}

.code-block-wrapper:hover .copy-code-btn {
    opacity: 1;
}

.copy-code-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    color: var(--text-primary);
}

.copy-code-btn.copied {
    background: var(--accent);
    color: white;
    opacity: 1;
}