/* ==================== CSS 变量 ==================== */
:root {
    --color-primary-50: #faf5ff;
    --color-primary-100: #f3e8ff;
    --color-primary-200: #e9d5ff;
    --color-primary-300: #d8b4fe;
    --color-primary-400: #c084fc;
    --color-primary-500: #a855f7;
    --color-primary-600: #9333ea;
    --color-primary-700: #7e22ce;
    --color-primary-800: #6b21a8;
    --color-primary-900: #581c87;

    --color-gray-50: #fafafa;
    --color-gray-100: #f4f4f5;
    --color-gray-200: #e4e4e7;
    --color-gray-300: #d4d4d8;
    --color-gray-400: #a1a1aa;
    --color-gray-500: #71717a;
    --color-gray-600: #52525b;
    --color-gray-700: #3f3f46;
    --color-gray-800: #27272a;
    --color-gray-900: #18181b;
    --color-gray-950: #09090b;

    --bg-base: #0a0a0a;
    --bg-elevated: #121212;
    --bg-surface: #1a1a1a;
    --bg-muted: #0f0f0f;

    --border-primary: rgba(255, 255, 255, 0.06);
    --border-secondary: rgba(255, 255, 255, 0.04);
    --border-accent: rgba(168, 85, 247, 0.4);

    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --text-tertiary: #71717a;
    --text-muted: #52525b;

    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.6);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.7);

    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 10px;
    --radius-xl: 12px;

    --transition-base: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 200ms cubic-bezier(0.4, 0, 0.2, 1);

    --sidebar-width: 240px;
    --sidebar-collapsed-width: 60px;
}

/* ==================== 基础重置 ==================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-primary);
    background: var(--bg-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

button {
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
    cursor: pointer;
    border: none;
    background: none;
    color: inherit;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
    color: inherit;
}

a {
    color: inherit;
    text-decoration: none;
}

/* ==================== 侧边栏 ==================== */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background: var(--bg-elevated);
    border-right: 1px solid var(--border-primary);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-smooth);
    z-index: 100;
}

.sidebar-header {
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    border-bottom: 1px solid var(--border-primary);
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    color: var(--color-primary-500);
    flex-shrink: 0;
}

.logo-text {
    font-size: 15px;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.sidebar-toggle {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    transition: var(--transition-base);
}

.sidebar-toggle:hover {
    background: var(--bg-surface);
    color: var(--text-primary);
}

/* 导航 */
.sidebar-nav {
    flex: 1;
    padding: 12px 8px;
    overflow-y: auto;
}

.sidebar-nav::-webkit-scrollbar {
    width: 4px;
}

.sidebar-nav::-webkit-scrollbar-thumb {
    background: var(--border-primary);
    border-radius: 2px;
}

.nav-item {
    width: 100%;
    height: 40px;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 12px;
    margin-bottom: 2px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition-base);
}

.nav-item:hover {
    background: var(--bg-surface);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--bg-surface);
    color: var(--text-primary);
    box-shadow: inset 0 0 0 1px var(--border-primary);
}

.nav-item svg {
    flex-shrink: 0;
}

/* 侧边栏底部 */
.sidebar-footer {
    padding: 12px 16px;
    border-top: 1px solid var(--border-primary);
}

.connection-status {
    margin-bottom: 12px;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 4px;
}

.status-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-gray-600);
    transition: var(--transition-base);
}

.connection-status.connected .status-dot {
    background: #10b981;
    box-shadow: 0 0 8px rgba(16, 185, 129, 0.5);
}

.connection-status.error .status-dot {
    background: #ef4444;
    box-shadow: 0 0 8px rgba(239, 68, 68, 0.5);
}

.status-label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
}

.status-detail {
    font-size: 12px;
    color: var(--text-tertiary);
    display: block;
    padding-left: 14px;
}

.sidebar-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--text-tertiary);
}

.footer-link {
    transition: var(--transition-base);
}

.footer-link:hover {
    color: var(--text-secondary);
}

.footer-divider {
    color: var(--border-primary);
}

/* ==================== 主内容区 ==================== */
.main-content {
    margin-left: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-base);
}

/* 视图容器 */
.view {
    display: none;
    height: 100%;
    overflow: hidden;
}

.view.active {
    display: block;
}

.view-header {
    padding: 32px 40px 24px;
    border-bottom: 1px solid var(--border-primary);
}

.view-title {
    font-size: 24px;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
}

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

/* ==================== 工作区 ==================== */
.workspace-container {
    height: 100%;
    display: flex;
    flex-direction: column;
}

.thread-container {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
}

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

.thread-container::-webkit-scrollbar-track {
    background: transparent;
}

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

.thread-container::-webkit-scrollbar-thumb:hover {
    background: var(--border-secondary);
}

/* 空状态 */
.thread-empty {
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    gap: 16px;
}

.empty-icon {
    color: var(--text-tertiary);
    opacity: 0.6;
}

.empty-title {
    font-size: 20px;
    font-weight: 600;
    letter-spacing: -0.01em;
}

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

.empty-hints {
    display: flex;
    gap: 8px;
    margin-top: 8px;
}

.hint-chip {
    padding: 4px 12px;
    border-radius: 12px;
    border: 1px solid var(--border-primary);
    background: var(--bg-elevated);
    font-size: 12px;
    color: var(--text-tertiary);
}

/* 消息 */
.message-group {
    margin-bottom: 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.message-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    width: 100%;
    max-width: 720px;
}

.message-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
    flex-shrink: 0;
}

.message-group.user .message-avatar {
    background: linear-gradient(135deg, var(--color-primary-600), var(--color-primary-700));
}

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

.message-author {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
}

.message-content {
    width: 100%;
    max-width: 720px;
    padding: 12px 16px;
    border-radius: var(--radius-lg);
    font-size: 14px;
    line-height: 1.6;
    word-wrap: break-word;
}

.message-group.user .message-content {
    background: var(--bg-surface);
    border: 1px solid var(--border-primary);
}

.message-group.assistant .message-content {
    background: transparent;
    padding-left: 0;
}

/* 媒体内容 */
.media-attachment {
    margin-top: 12px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-primary);
    background: var(--bg-elevated);
}

.media-attachment img,
.media-attachment video {
    width: 100%;
    max-width: 600px;
    display: block;
}

.media-footer {
    padding: 12px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg-surface);
    border-top: 1px solid var(--border-primary);
}

.media-info {
    font-size: 13px;
    color: var(--text-tertiary);
}

.media-actions {
    display: flex;
    gap: 8px;
}

.media-action {
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    color: var(--text-secondary);
    transition: var(--transition-base);
}

.media-action:hover {
    background: var(--bg-muted);
    color: var(--text-primary);
}

/* 输入状态 */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 12px 0;
    margin-left: 36px;
}

.typing-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--text-tertiary);
    animation: typing 1.4s ease-in-out infinite;
}

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

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

@keyframes typing {
    0%, 60%, 100% {
        opacity: 0.3;
        transform: translateY(0);
    }
    30% {
        opacity: 1;
        transform: translateY(-4px);
    }
}

/* ==================== 输入框 ==================== */
.composer-container {
    border-top: 1px solid var(--border-primary);
    background: var(--bg-elevated);
    padding: 16px 24px;
}

.composer-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.mode-selector {
    display: flex;
    gap: 4px;
    padding: 3px;
    background: var(--bg-surface);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
}

.mode-option {
    width: 32px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    color: var(--text-tertiary);
    transition: var(--transition-base);
}

.mode-option:hover {
    background: var(--bg-muted);
    color: var(--text-secondary);
}

.mode-option.active {
    background: var(--bg-base);
    color: var(--text-primary);
    box-shadow: var(--shadow-xs);
}

.route-label {
    font-size: 12px;
    color: var(--text-tertiary);
    font-weight: 500;
}

.composer-input-wrapper {
    display: flex;
    gap: 12px;
    align-items: flex-end;
    padding: 12px 16px;
    background: var(--bg-surface);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    transition: var(--transition-base);
}

.composer-input-wrapper:focus-within {
    border-color: var(--border-accent);
    box-shadow: 0 0 0 3px rgba(168, 85, 247, 0.1);
}

.composer-input {
    flex: 1;
    min-height: 24px;
    max-height: 200px;
    background: transparent;
    border: none;
    outline: none;
    resize: none;
    color: var(--text-primary);
    font-size: 14px;
}

.composer-input::placeholder {
    color: var(--text-tertiary);
}

.composer-send {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: var(--color-primary-600);
    color: white;
    transition: var(--transition-base);
    flex-shrink: 0;
}

.composer-send:hover {
    background: var(--color-primary-700);
}

.composer-send:active {
    transform: scale(0.95);
}

.composer-send:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.composer-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 12px;
}

.composer-action {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    color: var(--text-tertiary);
    transition: var(--transition-base);
}

.composer-action:hover {
    background: var(--bg-surface);
    color: var(--text-secondary);
}

.composer-hint {
    font-size: 11px;
    color: var(--text-muted);
}

/* ==================== 工具视图 ==================== */
.tools-grid {
    padding: 40px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
    max-height: calc(100vh - 140px);
    overflow-y: auto;
}

.tools-grid::-webkit-scrollbar {
    width: 8px;
}

.tools-grid::-webkit-scrollbar-thumb {
    background: var(--border-primary);
    border-radius: 4px;
}

.tool-card {
    padding: 20px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-xl);
    transition: var(--transition-smooth);
}

.tool-card:hover {
    border-color: var(--border-secondary);
    box-shadow: var(--shadow-md);
}

.tool-header {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
}

.tool-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: var(--bg-surface);
    border: 1px solid var(--border-primary);
    color: var(--color-primary-500);
    flex-shrink: 0;
}

.tool-meta {
    flex: 1;
    min-width: 0;
}

.tool-name {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 2px;
}

.tool-version {
    font-size: 12px;
    color: var(--text-tertiary);
}

.tool-description {
    font-size: 13px;
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.tool-specs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}

.spec-item {
    padding: 4px 10px;
    border-radius: 12px;
    background: var(--bg-surface);
    border: 1px solid var(--border-primary);
    font-size: 11px;
    color: var(--text-tertiary);
    font-weight: 500;
}

.tool-actions {
    display: flex;
    gap: 8px;
}

.btn-download {
    flex: 1;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 0 16px;
    background: var(--color-primary-600);
    border-radius: var(--radius-md);
    color: white;
    font-size: 13px;
    font-weight: 500;
    transition: var(--transition-base);
}

.btn-download:hover {
    background: var(--color-primary-700);
}

.btn-copy {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-primary);
    color: var(--text-secondary);
    transition: var(--transition-base);
}

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

/* ==================== 设置视图 ==================== */
.settings-content {
    padding: 40px;
    max-height: calc(100vh - 140px);
    overflow-y: auto;
}

.settings-content::-webkit-scrollbar {
    width: 8px;
}

.settings-content::-webkit-scrollbar-thumb {
    background: var(--border-primary);
    border-radius: 4px;
}

.settings-section {
    margin-bottom: 40px;
}

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

.section-title {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

.settings-grid.compact {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.setting-field {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.field-label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
}

.field-input,
.field-select {
    height: 40px;
    padding: 0 12px;
    background: var(--bg-surface);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    transition: var(--transition-base);
}

.field-input:focus,
.field-select:focus {
    outline: none;
    border-color: var(--border-accent);
    box-shadow: 0 0 0 3px rgba(168, 85, 247, 0.1);
}

.field-hint {
    font-size: 11px;
    color: var(--text-muted);
}

.btn-primary {
    height: 40px;
    padding: 0 20px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: var(--color-primary-600);
    border-radius: var(--radius-md);
    color: white;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition-base);
}

.btn-primary:hover {
    background: var(--color-primary-700);
}

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

.connection-result {
    margin-top: 16px;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    font-size: 13px;
    line-height: 1.5;
}

.connection-result.success {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: #10b981;
}

.connection-result.error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #ef4444;
}

.connection-result.info {
    background: rgba(168, 85, 247, 0.1);
    border: 1px solid rgba(168, 85, 247, 0.3);
    color: var(--color-primary-400);
}

.privacy-banner {
    display: flex;
    gap: 12px;
    padding: 16px;
    background: var(--bg-surface);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
}

.privacy-banner svg {
    flex-shrink: 0;
    color: var(--text-tertiary);
}

.privacy-text strong {
    display: block;
    font-size: 13px;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.privacy-text p {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ==================== 响应式 ==================== */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

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

    .main-content {
        margin-left: 0;
    }

    .tools-grid {
        grid-template-columns: 1fr;
        padding: 24px;
    }

    .settings-content {
        padding: 24px;
    }

    .settings-grid {
        grid-template-columns: 1fr;
    }
}