:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --text-primary: #c9d1d9;
    --text-secondary: #8b949e;
    --accent: #58a6ff;
    --accent-hover: #1f6feb;
    --border: #30363d;
    --user-message-bg: #161b22;
    --ai-message-bg: #0d1117;
    --font-family: -apple-system, BlinkMacSystemFont, 'SF Mono', 'Segoe UI Mono', 'Roboto Mono', monospace;
}

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

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
}

.app-container {
    display: flex;
    height: 100%;
}

/* Sidebar */
.sidebar {
    width: 300px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border);
}

.sidebar-header h2 {
    font-size: 20px;
    margin-bottom: 15px;
    font-weight: 600;
}

.new-chat-btn {
    width: 100%;
    padding: 12px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: background 0.2s;
    font-weight: 600;
}

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

.admin-btn {
    margin-top: 10px;
    width: 100%;
    padding: 12px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.2s;
}

.admin-btn:hover {
    background: var(--border);
}

/* Search Container */
.search-container {
    padding: 12px 20px;
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
}

.search-container svg {
    color: var(--text-secondary);
    flex-shrink: 0;
}

.search-container input {
    flex: 1;
    padding: 8px 10px;
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 13px;
    font-family: inherit;
}

.search-container input:focus {
    outline: none;
    border-color: var(--accent);
}

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

.clear-search {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all 0.2s;
}

.clear-search:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.chat-list {
    flex: 1;
    overflow-y: auto;
    padding: 10px;
}

.chat-list::-webkit-scrollbar {
    width: 8px;
}

.chat-list::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

.chat-list::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

.chat-item {
    padding: 12px;
    margin-bottom: 8px;
    background: var(--bg-tertiary);
    border: 1px solid transparent;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-item:hover {
    background: var(--border);
}

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

.chat-item-title {
    font-size: 13px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 1;
}

.delete-chat {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    margin-left: 8px;
    opacity: 0.6;
    transition: opacity 0.2s;
}

.delete-chat:hover {
    opacity: 1;
    color: #ef4444;
}

/* Main Chat Area */
.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-primary);
}

.chat-header {
    padding: 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 15px;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
}

.chat-header h3 {
    flex: 1;
    font-size: 16px;
    font-weight: 600;
}

.download-btn {
    padding: 8px 16px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 13px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s;
}

.download-btn:hover {
    background: var(--border);
}

.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

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

.messages-container::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

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

.message {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    max-width: 100%;
    margin-bottom: 12px;
    padding: 16px 20px;
}

.message.user {
    border-left: 3px solid var(--accent);
}

.message.ai {
    border-left: 3px solid var(--text-secondary);
}

.message-sender {
    font-size: 11px;
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-weight: 600;
}

.message-attachments {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 12px;
}

.message-image {
    max-width: 300px;
    max-height: 300px;
    border-radius: 6px;
    border: 1px solid var(--border);
    object-fit: contain;
    cursor: pointer;
    transition: transform 0.2s;
}

.message-image:hover {
    transform: scale(1.02);
}

.message-attachment {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 12px;
}

.attachment-icon {
    font-size: 14px;
}

.message-content {
    white-space: pre-wrap;
    font-size: 13px;
    line-height: 1.7;
}

/* Input Container */
.input-container {
    padding: 20px;
    border-top: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 10px;
    background: var(--bg-primary);
}

.settings-row {
    display: flex;
    gap: 10px;
    align-items: flex-end;
}

.model-select {
    flex: 1;
}

.model-select select {
    width: 100%;
    padding: 10px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 13px;
    cursor: pointer;
}

.attach-btn {
    padding: 10px 16px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 13px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s;
}

.attach-btn:hover {
    background: var(--border);
    border-color: var(--accent);
}

/* Attachments Panel */
.attachments-panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 10px;
}

.attachment-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 16px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 10px;
}

.tab-btn {
    padding: 8px 16px;
    background: none;
    color: var(--text-secondary);
    border: none;
    border-radius: 4px;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
}

.tab-btn:hover {
    color: var(--text-primary);
}

.tab-btn.active {
    background: var(--accent);
    color: white;
}

.attachment-tab-content {
    display: none;
}

.attachment-tab-content.active {
    display: block;
}

/* Drop Zone */
.drop-zone {
    border: 2px dashed var(--border);
    border-radius: 8px;
    padding: 40px 20px;
    text-align: center;
    transition: all 0.2s;
    cursor: pointer;
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--accent);
    background: var(--bg-tertiary);
}

.drop-zone-content svg {
    width: 40px;
    height: 40px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.drop-zone-content p {
    color: var(--text-primary);
    font-size: 13px;
    margin-bottom: 4px;
}

.drop-zone-hint {
    color: var(--text-secondary) !important;
    font-size: 11px !important;
}

/* URL Input */
.url-input-wrapper {
    display: flex;
    gap: 10px;
}

.url-input {
    flex: 1;
    padding: 10px;
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 13px;
}

.url-input:focus {
    outline: none;
    border-color: var(--accent);
}

.fetch-url-btn {
    padding: 10px 20px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 13px;
    cursor: pointer;
    font-weight: 600;
}

.fetch-url-btn:hover {
    background: var(--accent-hover);
}

/* Attachments List */
.attachments-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.attachment-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 12px;
}

.attachment-icon {
    font-size: 16px;
}

.attachment-name {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.attachment-remove {
    padding: 4px 8px;
    background: none;
    color: var(--text-secondary);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
}

.attachment-remove:hover {
    color: #ef4444;
    background: var(--bg-secondary);
}

.prompt-container {
    display: flex;
    align-items: flex-end;
    gap: 10px;
    width: 100%;
}

.prompt-prefix {
    font-size: 18px;
    font-weight: 600;
    color: var(--accent);
    padding-bottom: 12px;
    padding-left: 8px;
    white-space: nowrap;
}

#messageInput {
    flex: 1;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
    color: var(--text-primary);
    resize: none;
    font-family: inherit;
    max-height: 200px;
}

#messageInput:focus {
    outline: none;
    border-color: var(--accent);
}

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

/* Loading indicator */
.loading {
    display: flex;
    gap: 6px;
    align-items: center;
}

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

@keyframes bounce {
    0%, 80%, 100% {
        transform: scale(0);
    }
    40% {
        transform: scale(1);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        height: 100%;
        z-index: 100;
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .menu-toggle {
        display: block;
    }

    .message {
        padding: 12px 16px;
    }
    
    .settings-row {
        flex-direction: column;
    }
    
    .model-select {
        width: 100%;
    }
    
    .attach-btn {
        width: 100%;
        justify-content: center;
    }
}