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

:root {
    --primary-bg: #171717;
    --secondary-bg: #212121;
    --tertiary-bg: #2f2f2f;
    --text-primary: #ececec;
    --text-secondary: #b4b4b4;
    --accent: #10a37f;
    --accent-hover: #0e8c6b;
    --border: #3e3e3e;
    --error: #ef4444;
    --warning: #f59e0b;
    --success: #10b981;
    --shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
    --border-radius: 12px;
    --transition: all 0.2s ease;
}

[data-theme="light"] {
    --primary-bg: #ffffff;
    --secondary-bg: #f7f7f8;
    --tertiary-bg: #eeeeee;
    --text-primary: #2e2e2e;
    --text-secondary: #6e6e80;
    --border: #e5e5e7;
    --shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--primary-bg);
    color: var(--text-primary);
    height: 100vh;
    display: flex;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--secondary-bg);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    transition: var(--transition);
    z-index: 100;
}

.sidebar.collapsed {
    width: 0;
    overflow: hidden;
}

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

.new-chat-btn {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background-color: transparent;
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
}

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

.chat-history {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}

.chat-item {
    padding: 10px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    margin-bottom: 2px;
    transition: var(--transition);
    position: relative;
    display: flex;
    align-items: center;
    gap: 8px;
}

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

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

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

.chat-item-actions {
    display: none;
    gap: 4px;
}

.chat-item:hover .chat-item-actions {
    display: flex;
}

.chat-action-btn {
    padding: 4px;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 4px;
    transition: var(--transition);
}

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

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 8px;
}

.avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: white;
    font-size: 14px;
}

.username {
    font-size: 14px;
    font-weight: 500;
}

.settings-btn {
    padding: 8px;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 6px;
    transition: var(--transition);
}

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

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

.header {
    display: flex;
    align-items: center;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
    background-color: var(--primary-bg);
    z-index: 50;
}

.menu-toggle {
    display: none;
    padding: 8px;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    border-radius: 6px;
    margin-right: 16px;
    transition: var(--transition);
}

.menu-toggle:hover {
    background-color: var(--tertiary-bg);
}

.model-name h2 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

/* Chat Container */
.chat-container {
    flex: 1;
    overflow-y: auto;
    position: relative;
}

.welcome-screen {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: 24px;
}

.welcome-content {
    text-align: center;
    max-width: 800px;
}

.welcome-content h1 {
    font-size: 48px;
    font-weight: 600;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--accent), #059669);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.welcome-content p {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 48px;
}

.suggestions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
    margin-top: 24px;
}

.suggestion-card {
    background-color: var(--secondary-bg);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    padding: 20px;
    cursor: pointer;
    transition: var(--transition);
    text-align: left;
}

.suggestion-card:hover {
    background-color: var(--tertiary-bg);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.suggestion-card h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.suggestion-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.messages-container {
    padding: 24px;
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
    display: none;
}

.messages-container.active {
    display: block;
}

.message {
    margin-bottom: 24px;
    display: flex;
    gap: 16px;
    opacity: 0;
    animation: fadeInUp 0.4s ease forwards;
}

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

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
    flex-shrink: 0;
}

.message.user .message-avatar {
    background-color: var(--accent);
    color: white;
}

.message.assistant .message-avatar {
    background-color: var(--secondary-bg);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.message-content {
    flex: 1;
    line-height: 1.6;
}

.message-text {
    font-size: 15px;
    margin-bottom: 8px;
}

.message-text pre {
    background-color: var(--secondary-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px;
    overflow-x: auto;
    margin: 8px 0;
    font-size: 14px;
}

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

.message-actions {
    display: flex;
    gap: 8px;
    opacity: 0;
    transition: var(--transition);
}

.message:hover .message-actions {
    opacity: 1;
}

.message-action-btn {
    padding: 6px 8px;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 6px;
    font-size: 12px;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 4px;
}

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

.typing-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 16px 0;
    color: var(--text-secondary);
}

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

.typing-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--text-secondary);
    animation: typingPulse 1.4s infinite;
}

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

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

@keyframes typingPulse {
    0%, 60%, 100% {
        opacity: 0.3;
        transform: scale(0.8);
    }
    30% {
        opacity: 1;
        transform: scale(1);
    }
}

/* Input Container */
.input-container {
    padding: 24px;
    border-top: 1px solid var(--border);
    background-color: var(--primary-bg);
}

.input-wrapper {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    background-color: var(--secondary-bg);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition);
}

.input-wrapper:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(16, 163, 127, 0.1);
}

#messageInput {
    width: 100%;
    padding: 16px 60px 16px 16px;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 15px;
    line-height: 1.5;
    resize: none;
    max-height: 200px;
    font-family: inherit;
}

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

.input-actions {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    gap: 4px;
}

.send-btn {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    border: none;
    background-color: var(--accent);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.send-btn:disabled {
    background-color: var(--tertiary-bg);
    color: var(--text-secondary);
    cursor: not-allowed;
}

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

.input-footer {
    max-width: 800px;
    margin: 8px auto 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    color: var(--text-secondary);
}

.character-count {
    font-weight: 500;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-overlay.active {
    display: flex;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background-color: var(--primary-bg);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 500px;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px;
    border-bottom: 1px solid var(--border);
}

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

.close-modal {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    border: none;
    background: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

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

.modal-content {
    padding: 20px;
}

.setting-group {
    margin-bottom: 20px;
}

.setting-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 14px;
}

.setting-group select, .setting-group input[type="text"] {
    width: 100%;
    padding: 10px 12px;
    background-color: var(--secondary-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
}

.setting-group select:focus, .setting-group input[type="text"]:focus {
    outline: none;
    border-color: var(--accent);
}

.setting-group input[type="checkbox"] {
    margin-right: 8px;
    transform: scale(1.2);
}

/* API Connection Status */
.connection-status {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 8px;
    font-size: 12px;
}

.connection-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--error);
}

.connection-indicator.connected {
    background-color: var(--success);
}

.message-meta {
    font-size: 12px;
    color: #777;
    margin-top: 4px;
}
.file-name {
    color: #444;
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -260px;
        height: 100vh;
        z-index: 200;
    }
    
    .sidebar.open {
        left: 0;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .main-content {
        width: 100%;
    }
    
    .suggestions {
        grid-template-columns: 1fr;
    }
    
    .welcome-content h1 {
        font-size: 36px;
    }
    
    .input-container,
    .messages-container {
        padding: 16px;
    }
    
    .header {
        padding: 12px 16px;
    }
}

@media (max-width: 480px) {
    .welcome-content h1 {
        font-size: 28px;
    }
    
    .welcome-content p {
        font-size: 16px;
    }
    
    .suggestion-card {
        padding: 16px;
    }
    
    .message {
        gap: 12px;
    }
    
    .message-avatar {
        width: 28px;
        height: 28px;
        font-size: 12px;
    }
}