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

/* Theme Variables */
:root {
    /* Dark Theme (default) - gray/black only */
    --bg-primary: #1a1a1a;
    --bg-secondary: #242424;
    --bg-tertiary: #2d2d2d;
    --text-primary: #eaeaea;
    --text-secondary: #a0a0a0;
    --accent: #e94560;
    --user-bg: #2d2d2d;
    --assistant-bg: #242424;
    --border-color: #3a3a3a;
    --input-bg: var(--bg-secondary);
    --hover-bg: var(--bg-tertiary);
}

[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --bg-tertiary: #e8e8e8;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --accent: #e94560;
    --user-bg: #e3f2fd;
    --assistant-bg: #f0f0f0;
    --border-color: #d0d0d0;
    --input-bg: #ffffff;
    --hover-bg: #e8e8e8;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
    transition: background-color 0.3s, color 0.3s;
}

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

/* Sidebar */
.sidebar {
    width: 280px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s;
}

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

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

.btn-new {
    background: var(--accent);
    border: none;
    color: white;
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    transition: opacity 0.2s;
}

.btn-new:hover {
    opacity: 0.9;
}

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

.session-item {
    padding: 12px;
    border-radius: 8px;
    cursor: pointer;
    margin-bottom: 6px;
    transition: background 0.2s;
    position: relative;
}

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

.session-item.active {
    background: var(--bg-tertiary);
    border-left: 3px solid var(--accent);
}

.session-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
    margin-bottom: 4px;
}

.session-title {
    font-weight: 600;
    font-size: 13px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 180px;
}

.session-id {
    font-weight: 600;
    font-family: monospace;
}

.session-count {
    color: var(--text-secondary);
    font-size: 12px;
}

.session-time {
    font-size: 12px;
    color: var(--text-secondary);
}

.session-delete {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    opacity: 0;
    transition: opacity 0.2s, background 0.2s, color 0.2s;
}

.session-item:hover .session-delete {
    opacity: 1;
}

.session-delete:hover {
    background: var(--accent);
    color: white;
}

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

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

.chat-header h1 {
    font-size: 24px;
    font-weight: 600;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.tools-count {
    background: var(--bg-tertiary);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 14px;
    color: var(--text-secondary);
}

/* Theme Toggle Button */
.theme-toggle {
    background: var(--bg-tertiary);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s, transform 0.2s;
    font-size: 20px;
}

.theme-toggle:hover {
    transform: scale(1.1);
    background: var(--hover-bg);
}

.theme-toggle svg {
    width: 24px;
    height: 24px;
    fill: var(--text-primary);
    color: var(--text-primary);
    transition: fill 0.3s;
}

/* Messages */
.messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

.message {
    margin-bottom: 20px;
    max-width: 80%;
    padding: 16px;
    border-radius: 12px;
    transition: background-color 0.3s;
}

.message.user {
    background: var(--user-bg);
    margin-left: auto;
}

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

.message.assistant.loading .typing {
    animation: pulse 1.5s infinite;
}

/* Thinking/reasoning messages - smaller font */
.message.thinking {
    font-size: 0.85em;
    opacity: 0.8;
    background: var(--bg-tertiary);
    border-left: 3px solid var(--text-secondary);
}

.message.thinking .message-role {
    font-size: 0.9em;
}

.message.thinking .message-content {
    font-style: italic;
    color: var(--text-secondary);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.message-role {
    font-size: 12px;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-weight: 600;
}

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

.message-content pre {
    background: var(--bg-primary);
    padding: 12px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 10px 0;
}

.message-content code {
    font-family: 'Fira Code', 'Consolas', monospace;
    font-size: 14px;
}

.message-content p {
    margin-bottom: 10px;
}

.message-content p:last-child {
    margin-bottom: 0;
}

.message-content ul, .message-content ol {
    margin-left: 20px;
    margin-bottom: 10px;
}

.message-content a {
    color: var(--accent);
}

/* Tool Calls */
.tool-calls {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px dashed var(--border-color);
}

.tool-call {
    background: var(--bg-primary);
    border-radius: 8px;
    margin-bottom: 10px;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.tool-call.pending {
    border-color: var(--accent);
    animation: tool-pulse 1.5s infinite;
}

@keyframes tool-pulse {
    0%, 100% { border-color: var(--accent); }
    50% { border-color: transparent; }
}

.tool-call-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.tool-icon {
    font-size: 14px;
    opacity: 0.7;
}

.tool-server {
    color: var(--accent);
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    opacity: 0.8;
}

.tool-name {
    font-weight: 600;
    color: var(--accent);
    font-size: 13px;
    font-family: monospace;
}

.tool-status {
    margin-left: auto;
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 10px;
    text-transform: uppercase;
    font-weight: 600;
}

.tool-status.pending {
    background: rgba(233, 69, 96, 0.2);
    color: var(--accent);
    animation: status-blink 1s infinite;
}

.tool-status.done {
    background: rgba(76, 175, 80, 0.2);
    color: #4caf50;
}

@keyframes status-blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.tool-call-body {
    padding: 10px 12px;
}

.tool-section {
    margin-bottom: 10px;
}

.tool-section:last-child {
    margin-bottom: 0;
}

.tool-section-label {
    font-size: 10px;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 4px;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.tool-args, .tool-result {
    font-size: 11px;
    font-family: 'Fira Code', 'Consolas', monospace;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    padding: 8px 10px;
    border-radius: 4px;
    overflow-x: auto;
    margin: 0;
    white-space: pre-wrap;
    word-break: break-all;
    max-height: 200px;
    overflow-y: auto;
}

.tool-result {
    color: var(--text-primary);
    border-left: 2px solid #4caf50;
}

/* Input Area */
.input-area {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 12px;
}

.input-area textarea {
    flex: 1;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 12px;
    border-radius: 8px;
    font-size: 16px;
    resize: none;
    font-family: inherit;
    transition: background-color 0.3s, border-color 0.3s;
}

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

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

.input-area button {
    background: var(--accent);
    border: none;
    color: white;
    padding: 12px 24px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: opacity 0.2s;
}

.input-area button:hover:not(:disabled) {
    opacity: 0.9;
}

.input-area button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Stop button */
.btn-stop {
    background: #dc3545 !important;
}

.btn-stop:hover:not(:disabled) {
    background: #c82333 !important;
}

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

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

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

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

/* Status Button */
.status-btn {
    background: var(--bg-tertiary);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s, transform 0.2s;
}

.status-btn:hover {
    transform: scale(1.1);
    background: var(--hover-bg);
}

.status-btn svg {
    width: 22px;
    height: 22px;
    fill: var(--text-primary);
    stroke: var(--text-primary);
}

/* Overlay */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.overlay-content {
    background: var(--bg-secondary);
    border-radius: 12px;
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.overlay-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.overlay-header h3 {
    font-size: 18px;
    font-weight: 600;
}

.overlay-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 20px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    transition: color 0.2s, background 0.2s;
}

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

.overlay-body {
    padding: 20px;
    overflow-y: auto;
    flex: 1;
}

.overlay-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
}

.overlay-footer button {
    background: var(--accent);
    border: none;
    color: white;
    padding: 8px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    transition: opacity 0.2s;
}

.overlay-footer button:hover:not(:disabled) {
    opacity: 0.9;
}

.overlay-footer button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Status Styles */
.status-loading, .status-error {
    text-align: center;
    padding: 20px;
    color: var(--text-secondary);
}

.status-error {
    color: #e94560;
}

.status-summary {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.status-badge {
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
}

.status-badge.status-ok {
    background: #2e7d32;
    color: white;
}

.status-badge.status-error {
    background: #c62828;
    color: white;
}

.status-tools {
    color: var(--text-secondary);
    font-size: 14px;
}

.server-card {
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 12px;
}

.server-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

.server-status {
    font-size: 16px;
}

.server-status.connected {
    color: #4caf50;
}

.server-status.disconnected {
    color: #f44336;
}

.server-name {
    font-weight: 600;
    font-size: 16px;
}

.server-transport {
    background: var(--bg-primary);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 12px;
    color: var(--text-secondary);
    margin-left: auto;
}

.server-details {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 12px;
}

.server-detail {
    display: flex;
    gap: 6px;
    font-size: 13px;
}

.detail-label {
    color: var(--text-secondary);
}

.detail-value {
    color: var(--text-primary);
    font-family: monospace;
}

.tools-list {
    border-top: 1px solid var(--border-color);
    padding-top: 12px;
}

.tool-item {
    padding: 8px 0;
    border-bottom: 1px dashed var(--border-color);
}

.tool-item:last-child {
    border-bottom: none;
}

.tool-item-name {
    font-weight: 600;
    font-size: 13px;
    color: var(--accent);
    display: block;
}

.tool-item-desc {
    font-size: 12px;
    color: var(--text-secondary);
    display: block;
    margin-top: 2px;
}

/* Login Screen */
.login-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: var(--bg-primary);
    padding: 20px;
}

.login-box {
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 40px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.login-header {
    text-align: center;
    margin-bottom: 32px;
}

.login-header h1 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.login-header p {
    color: var(--text-secondary);
    font-size: 16px;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-group input {
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.2s, background-color 0.3s;
}

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

.form-group input::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

.form-group input:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.login-error {
    background: rgba(233, 69, 96, 0.1);
    border: 1px solid rgba(233, 69, 96, 0.3);
    color: #e94560;
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 14px;
    text-align: center;
}

.login-btn {
    background: var(--accent);
    border: none;
    color: white;
    padding: 14px 24px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s, transform 0.1s;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
}

.login-btn:hover:not(:disabled) {
    opacity: 0.9;
}

.login-btn:active:not(:disabled) {
    transform: scale(0.98);
}

.login-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.login-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Logout Button */
.logout-btn {
    background: var(--bg-tertiary);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s, transform 0.2s;
}

.logout-btn:hover {
    transform: scale(1.1);
    background: var(--hover-bg);
}

.logout-btn svg {
    width: 22px;
    height: 22px;
    fill: var(--text-primary);
    color: var(--text-primary);
}

/* MCP Button */
.mcp-btn {
    background: var(--bg-tertiary);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s, transform 0.2s;
}

.mcp-btn:hover {
    transform: scale(1.1);
    background: var(--hover-bg);
}

.mcp-btn svg {
    width: 22px;
    height: 22px;
    fill: var(--text-primary);
    color: var(--text-primary);
}

/* LLM Button */
.llm-btn {
    background: var(--bg-tertiary);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s, transform 0.2s;
}

.llm-btn:hover {
    transform: scale(1.1);
    background: var(--hover-bg);
}

.llm-btn svg {
    width: 22px;
    height: 22px;
    fill: var(--text-primary);
    color: var(--text-primary);
}

/* MCP Overlay */
.mcp-overlay {
    max-width: 700px;
}

/* LLM Overlay */
.llm-overlay {
    max-width: 500px;
}

.llm-config-form .form-group {
    margin-bottom: 16px;
}

.llm-config-form label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.llm-config-form .hint {
    color: var(--text-secondary);
    font-size: 12px;
    font-style: italic;
}

.llm-config-form input[type="text"],
.llm-config-form input[type="password"],
.llm-config-form input[type="number"] {
    width: 100%;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 10px 12px;
    border-radius: 6px;
    font-size: 14px;
    transition: border-color 0.2s;
}

.llm-config-form input[type="text"]:focus,
.llm-config-form input[type="password"]:focus,
.llm-config-form input[type="number"]:focus {
    outline: none;
    border-color: var(--accent);
}

.llm-config-form .form-row {
    display: flex;
    gap: 16px;
}

.llm-config-form .form-row .form-group {
    flex: 1;
}

.btn-add-server {
    background: var(--accent);
    border: none;
    color: white;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    margin-left: auto;
    transition: opacity 0.2s;
}

.btn-add-server:hover {
    opacity: 0.9;
}

.add-server-form {
    background: var(--bg-primary);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 16px;
    border: 1px solid var(--border-color);
}

.add-server-form .form-group {
    margin-bottom: 12px;
}

.add-server-form .form-group:last-child {
    margin-bottom: 0;
}

.add-server-form label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.add-server-form input[type="text"],
.add-server-form select {
    width: 100%;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 10px 12px;
    border-radius: 6px;
    font-size: 14px;
}

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

.checkbox-label {
    display: flex !important;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--accent);
}

.form-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
    margin-top: 16px;
}

.btn-cancel {
    background: var(--bg-tertiary);
    border: none;
    color: var(--text-primary);
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.2s;
}

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

.btn-save {
    background: var(--accent);
    border: none;
    color: white;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    transition: opacity 0.2s;
}

.btn-save:hover {
    opacity: 0.9;
}

.mcp-server-card {
    position: relative;
}

.server-actions {
    display: flex;
    gap: 6px;
    margin-left: auto;
}

.btn-reconnect,
.btn-remove {
    background: var(--bg-primary);
    border: none;
    width: 28px;
    height: 28px;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    transition: background 0.2s;
}

.btn-reconnect {
    color: var(--text-secondary);
}

.btn-reconnect:hover {
    background: rgba(76, 175, 80, 0.2);
    color: #4caf50;
}

.btn-remove {
    color: var(--text-secondary);
}

.btn-remove:hover {
    background: rgba(244, 67, 54, 0.2);
    color: #f44336;
}

.btn-reconnect:disabled,
.btn-remove:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.no-servers {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
    font-size: 14px;
}