:root {
    --navbar-height: 72px;
    --chat-bg: #F5F5F5;
    --chat-text: #1F2937;
    --chat-sidebar-bg: #FFFFFF;
    --chat-sidebar-border: #E5E7EB;
    --chat-header-bg: #FFFFFF;
    --chat-header-border: #E5E7EB;
    --chat-main-bg: #F9FAFB;
    --chat-input-bg: #FFFFFF;
    --chat-input-border: #E5E7EB;
    --chat-message-bg: #FFFFFF;
    --chat-user-message-bg: #4F46E5;
    --chat-button-bg: #4F46E5;
    --chat-button-hover: #4338CA;
    --chat-text-muted: #6B7280;
    --chat-text-light: #9CA3AF;
    --chat-history-bg: #F9FAFB;
    --chat-history-hover: #F3F4F6;
    --chat-code-bg: #F3F4F6;
    --chat-code-text: #DC2626;
    --chat-pre-bg: #1F2937;
    --chat-pre-text: #F9FAFB;
    --chat-scrollbar: #D1D5DB;
    --chat-scrollbar-hover: #9CA3AF;
}

[data-theme="dark"] {
    --chat-bg: #0A0F1F;
    --chat-text: #E5E7EB;
    --chat-sidebar-bg: #1A2744;
    --chat-sidebar-border: #2A3F5F;
    --chat-header-bg: #1A2744;
    --chat-header-border: #2A3F5F;
    --chat-main-bg: #0F1729;
    --chat-input-bg: #1A2744;
    --chat-input-border: #2A3F5F;
    --chat-message-bg: #1A2744;
    --chat-user-message-bg: #4F46E5;
    --chat-button-bg: #4F46E5;
    --chat-button-hover: #4338CA;
    --chat-text-muted: #9CA3AF;
    --chat-text-light: #6B7280;
    --chat-history-bg: #0F1729;
    --chat-history-hover: #1A2744;
    --chat-code-bg: #2A3F5F;
    --chat-code-text: #F87171;
    --chat-pre-bg: #0A0F1F;
    --chat-pre-text: #E5E7EB;
    --chat-scrollbar: #2A3F5F;
    --chat-scrollbar-hover: #4A5F7F;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--chat-bg);
    color: var(--chat-text);
    min-height: 100vh;
}

.chat-container {
    display: flex;
    height: calc(100vh - var(--navbar-height));
    width: 100%;
    position: fixed;
    top: var(--navbar-height);
    left: 0;
    right: 0;
}

footer {
    display: none;
}

.sidebar {
    width: 256px;
    background: var(--chat-sidebar-bg);
    border-right: 1px solid var(--chat-sidebar-border);
    display: flex;
    flex-direction: column;
    padding: 16px;
    flex-shrink: 0;
}

.new-chat-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 12px 16px;
    background: var(--chat-button-bg);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
}

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

.new-chat-btn svg {
    flex-shrink: 0;
}

.chat-history-section {
    margin-top: 24px;
    flex: 1;
}

.chat-history-title {
    font-size: 11px;
    font-weight: 600;
    color: var(--chat-text-muted);
    letter-spacing: 0.5px;
    margin-bottom: 16px;
}

.no-history {
    font-size: 14px;
    color: var(--chat-text-light);
    text-align: center;
    padding: 20px 0;
}

.chat-history-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.chat-history-item {
    padding: 12px;
    background: var(--chat-history-bg);
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s;
}

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

.chat-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--chat-text);
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chat-date {
    font-size: 12px;
    color: var(--chat-text-light);
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--chat-main-bg);
    position: relative;
}

.chat-header {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 24px;
    background: var(--chat-header-bg);
    border-bottom: 1px solid var(--chat-header-border);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--chat-text-muted);
    cursor: pointer;
    padding: 4px;
}

.header-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.bot-icon {
    flex-shrink: 0;
}

.header-text {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.bot-name {
    font-size: 18px;
    font-weight: 600;
    color: var(--chat-text);
}

.bot-subtitle {
    font-size: 13px;
    color: var(--chat-text-muted);
    display: flex;
    align-items: center;
    gap: 4px;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 32px;
    display: flex;
    flex-direction: column;
}

.welcome-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    max-width: 600px;
    margin: auto;
}

.sparkle-icon {
    margin-bottom: 24px;
}

.welcome-title {
    font-size: 28px;
    font-weight: 500;
    color: var(--chat-text-muted);
    margin-bottom: 12px;
}

.welcome-subtitle {
    font-size: 15px;
    color: var(--chat-text-light);
    line-height: 1.6;
}

.input-container {
    padding: 24px 32px 32px;
    background: var(--chat-main-bg);
}

.input-wrapper {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
    display: flex;
    align-items: center;
    background: var(--chat-input-bg);
    border: 1px solid var(--chat-input-border);
    border-radius: 24px;
    padding: 12px 16px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.input-wrapper:focus-within {
    border-color: #4F46E5;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.chat-input {
    flex: 1;
    border: none;
    outline: none;
    font-size: 15px;
    color: var(--chat-text);
    background: transparent;
    padding: 4px 8px;
}

.chat-input::placeholder {
    color: var(--chat-text-light);
}

.send-btn {
    background: none;
    border: none;
    color: var(--chat-text-light);
    cursor: pointer;
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s;
    flex-shrink: 0;
}

.send-btn:hover {
    color: #4F46E5;
}

.send-btn svg {
    width: 20px;
    height: 20px;
}

::-webkit-scrollbar {
    width: 8px;
}

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

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

::-webkit-scrollbar-thumb:hover {
    background: var(--chat-scrollbar-hover);
}

.message {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
    max-width: 800px;
}

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

.bot-message {
    margin-right: auto;
}

.message-avatar {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
}

.message-content {
    background: var(--chat-message-bg);
    padding: 12px 16px;
    border-radius: 16px;
    font-size: 15px;
    line-height: 1.5;
    color: var(--chat-text);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
    word-wrap: break-word;
}

.user-message .message-content {
    background: var(--chat-user-message-bg);
    color: white;
    border-bottom-right-radius: 4px;
}

.bot-message .message-content {
    border-bottom-left-radius: 4px;
}

.message-content strong {
    font-weight: 600;
}

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

.message-content code {
    background: var(--chat-code-bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    color: var(--chat-code-text);
}

.message-content pre {
    background: var(--chat-pre-bg);
    color: var(--chat-pre-text);
    padding: 12px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 8px 0;
}

.message-content pre code {
    background: transparent;
    color: var(--chat-pre-text);
    padding: 0;
}

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

.typing-indicator {
    display: inline-block;
    color: var(--chat-text-light);
    animation: blink 1.4s infinite;
}

@keyframes blink {
    0%, 100% {
        opacity: 0.3;
    }
    50% {
        opacity: 1;
    }
}

@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -256px;
        top: var(--navbar-height);
        height: calc(100vh - var(--navbar-height));
        z-index: 1000;
        transition: left 0.3s;
    }

    .sidebar.active {
        left: 0;
    }

    .menu-toggle {
        display: block;
    }

    .input-container {
        padding: 16px;
    }

    .chat-messages {
        padding: 16px;
    }

    .welcome-title {
        font-size: 24px;
    }

    .message {
        max-width: 90%;
    }
}