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

:root {
    --primary-bg: #1a1a1a;
    --secondary-bg: #121212;
    --sidebar-bg: #171717;
    --text-primary: #e8e8e8;
    --text-secondary: #a0a0a0;
    --border-color: #2e2e2e;
    --message-user-bg: #2b2b2b;
    --message-assistant-bg: #1f1f1f;
    --input-bg: #1e1e1e;
    --accent: #4d4d4d;
    --accent-hover: #5f5f5f;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--primary-bg);
    color: var(--text-primary);
}

.container {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--sidebar-bg);
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border-color);
    overflow: hidden;
}

.sidebar-header {
    padding: 12px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-header h1 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 10px;
}

.new-chat-btn {
    width: 100%;
    padding: 8px;
    background-color: var(--accent);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 13px;
    cursor: pointer;
    transition: background-color 0.2s;
}

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

.chat-history {
    flex: 1;
    overflow-y: auto;
    padding: 6px;
}

.chat-list {
    display: flex;
    flex-direction: column;
    gap: 3px;
}

.chat-item {
    padding: 8px 10px;
    background-color: transparent;
    color: var(--text-primary);
    border-radius: 6px;
    cursor: pointer;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 13px;
    transition: background-color 0.2s;
    display: flex;
    align-items: center;
}

.chat-item-title {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

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

.chat-item.active {
    background-color: var(--accent);
    font-weight: 600;
}

.chat-item-delete {
    display: none;
    flex: 0 0 auto;
    margin-left: auto;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 14px;
}

.chat-item:hover .chat-item-delete {
    display: inline;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--secondary-bg);
    overflow: hidden;
}

.chat-header {
    padding: 16px;
    background-color: var(--primary-bg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-left h2 {
    font-size: 18px;
    font-weight: 600;
}

.model-status {
    display: block;
    margin-top: 4px;
    color: var(--text-secondary);
    font-size: 12px;
}

.model-progress {
    display: none;
    width: min(280px, 100%);
    height: 5px;
    margin-top: 8px;
    accent-color: #d9a441;
}

.model-progress.visible {
    display: block;
}

.header-right {
    display: flex;
    align-items: center;
}

.model-selector {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
    background-color: var(--input-bg);
    color: var(--text-primary);
}

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

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.message {
    display: flex;
    gap: 12px;
    animation: slideIn 0.3s ease-out;
}

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

.message.user {
    justify-content: flex-end;
}

.message-content {
    max-width: 70%;
    min-width: 0;
    padding: 12px 16px;
    border-radius: 12px;
    word-wrap: break-word;
    line-height: 1.4;
}

.message-content p + p,
.message-content ul + p,
.message-content ol + p {
    margin-top: 10px;
}

.message-content ul,
.message-content ol {
    margin: 8px 0 8px 20px;
}

.message-content li + li {
    margin-top: 4px;
}

.message-content code {
    padding: 2px 5px;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.08);
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.9em;
}

.message-content pre {
    max-width: 100%;
    margin: 10px 0;
    padding: 12px;
    overflow: auto;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: #141414;
    white-space: pre;
    overscroll-behavior-x: contain;
}

.message-content pre code {
    padding: 0;
    background: none;
    font-size: 12px;
}

.message-content blockquote {
    margin: 10px 0;
    padding-left: 12px;
    border-left: 3px solid #d9a441;
    color: var(--text-secondary);
}

.message-content a {
    color: #e5b85a;
}

.message.user .message-content {
    background-color: var(--message-user-bg);
    color: var(--text-primary);
}

.message.assistant .message-content {
    background-color: var(--message-assistant-bg);
    color: var(--text-primary);
}

/* Input Area */
.chat-input-area {
    padding: 16px;
    background-color: var(--secondary-bg);
    border-top: 1px solid var(--border-color);
}

.message-form {
    display: flex;
    gap: 12px;
}

.message-input {
    flex: 1;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    resize: none;
    max-height: 100px;
    background-color: var(--input-bg);
    color: var(--text-primary);
}

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

.send-btn {
    padding: 12px 20px;
    background-color: var(--accent);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
    height: 44px;
    min-width: 60px;
}

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

.send-btn:disabled {
    background-color: #2a2a2a;
    color: var(--text-secondary);
    cursor: not-allowed;
}

.stop-btn {
    padding: 12px 16px;
    background-color: #7c3f3f;
    color: var(--text-primary);
    border: 1px solid #965050;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    height: 44px;
}

.stop-btn:hover {
    background-color: #965050;
}

.technical-bar {
    display: flex;
    align-items: center;
    gap: 0;
    min-height: 30px;
    padding: 0 8px;
    border-top: 1px solid var(--border-color);
    background: #151515;
    overflow-x: auto;
    white-space: nowrap;
}

.technical-item {
    display: flex;
    flex: 0 0 auto;
    align-items: baseline;
    gap: 5px;
    padding: 0 9px;
    border-right: 1px solid var(--border-color);
}

.technical-item:last-child {
    border-right: none;
}

.technical-item span,
.technical-item strong {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.technical-item span {
    color: var(--text-secondary);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.technical-item strong {
    color: var(--text-primary);
    font-size: 11px;
    font-weight: 600;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: #3a3a3a;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #4d4d4d;
}

.chat-history::-webkit-scrollbar-thumb {
    background: #2e2e2e;
}

.chat-history::-webkit-scrollbar-thumb:hover {
    background: #3a3a3a;
}