/* ═══════════════════════════════════════════════════════════════
   Metona Ollama — Windows 11 Fluent Design 暗色主题
   Mica 材质 · Segoe UI Variable · WinUI 3 控件风格
   ═══════════════════════════════════════════════════════════════ */

/* ── CSS 变量 ── */
:root {
    /* Windows 11 暗色调色板 */
    --bg-solid: #202020;
    --bg-card: #2d2d2d;
    --bg-card-hover: #323232;
    --bg-layer: #383838;
    --bg-layer-alt: #2a2a2a;
    --bg-smoke: rgba(0, 0, 0, 0.3);
    --bg-mica: rgba(32, 32, 32, 0.72);
    --bg-acrylic: rgba(32, 32, 32, 0.8);

    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-default: rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.12);
    --border-focus: #60CDFF;

    --text-primary: #FFFFFF;
    --text-secondary: #999999;
    --text-tertiary: #666666;
    --text-disabled: #505050;

    --accent: #60CDFF;
    --accent-hover: #7AD8FF;
    --accent-subtle: rgba(96, 205, 255, 0.06);
    --accent-subtle-hover: rgba(96, 205, 255, 0.1);

    --critical: #F1707B;
    --critical-bg: rgba(241, 112, 123, 0.06);
    --success: #6CCB5F;
    --success-bg: rgba(108, 203, 95, 0.06);
    --caution: #FCE100;
    --caution-bg: rgba(252, 225, 0, 0.06);

    /* 圆角 — Windows 11 标准 */
    --radius-control: 4px;
    --radius-sm: 8px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* 阴影 — Fluent Design 深度 */
    --shadow-flyout: 0 8px 16px rgba(0, 0, 0, 0.14);
    --shadow-dialog: 0 24px 48px rgba(0, 0, 0, 0.18);
    --shadow-tooltip: 0 4px 8px rgba(0, 0, 0, 0.14);

    /* 字体 */
    --font: 'Segoe UI Variable', 'Segoe UI', system-ui, -apple-system, sans-serif;
    --font-mono: 'Cascadia Mono', 'Cascadia Code', 'Consolas', monospace;

    --transition: 167ms cubic-bezier(0, 0, 0, 1);
    --transition-fast: 83ms cubic-bezier(0, 0, 0, 1);
}

/* ── 全局重置 ── */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    overflow: hidden;
    background: var(--bg-solid);
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 14px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* ═══ 顶部导航 ═══ */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 16px;
    background: var(--bg-mica);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--border-subtle);
    flex-shrink: 0;
    z-index: 10;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
    flex: 1;
}

.logo {
    font-size: 20px;
    flex-shrink: 0;
}

.app-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
}

.app-version {
    font-size: 10px;
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--bg-layer);
    border: 1px solid var(--border-default);
    border-radius: 12px;
    padding: 1px 8px;
    white-space: nowrap;
    user-select: none;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* ── 连接状态 ── */
.conn-status {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border-radius: var(--radius-control);
    font-size: 12px;
    color: var(--text-secondary);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    transition: var(--transition);
}

.status-label {
    white-space: nowrap;
}

.conn-status.connected .status-dot {
    background: var(--success);
    box-shadow: 0 0 4px var(--success);
}

.conn-status.disconnected .status-dot {
    background: var(--critical);
}

.conn-status.pending .status-dot {
    background: var(--caution);
    animation: blink 1s ease-in-out infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

/* ── 图标按钮 (WinUI 3 风格) ── */
.icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    border-radius: var(--radius-control);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.icon-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-control);
    background: currentColor;
    opacity: 0;
    transition: var(--transition);
}

.icon-btn:hover::before {
    opacity: 0.06;
}

.icon-btn:active::before {
    opacity: 0.04;
}

.icon-btn:hover {
    color: var(--text-primary);
}

.icon-btn:active {
    transform: scale(0.97);
}

.icon-btn svg {
    width: 18px;
    height: 18px;
    position: relative;
    z-index: 1;
}

.icon-btn.disabled,
.icon-btn:disabled {
    opacity: 0.36;
    cursor: not-allowed;
    pointer-events: none;
}

.icon-btn.sm {
    width: 28px;
    height: 28px;
}

.icon-btn.sm svg {
    width: 14px;
    height: 14px;
}

.icon-btn.danger:hover {
    color: var(--critical);
}

.help-btn {
    margin-left: 2px;
    opacity: 0.5;
}

.help-btn:hover {
    opacity: 1;
}

/* ═══ 模型选择栏 ═══ */
.model-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 16px;
    background: var(--bg-layer-alt);
    border-bottom: 1px solid var(--border-subtle);
    flex-shrink: 0;
}

.model-bar-icon {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-control);
    background: var(--accent-subtle);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.model-bar-icon svg {
    width: 14px;
    height: 14px;
    color: var(--accent);
}

.model-select-wrap {
    position: relative;
    flex: 1;
    min-width: 0;
    display: flex;
    align-items: center;
}

.model-select {
    width: 100%;
    padding: 6px 32px 6px 12px;
    background: var(--bg-layer);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-control);
    color: var(--text-primary);
    font-size: 13px;
    font-family: var(--font);
    outline: none;
    cursor: pointer;
    transition: var(--transition);
    appearance: none;
    -webkit-appearance: none;
}

.model-select:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 1px var(--border-focus);
}

.model-select:hover {
    border-color: var(--border-strong);
}

.model-select option {
    background: var(--bg-card);
    color: var(--text-primary);
}

.model-select-arrow {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
    color: var(--text-tertiary);
}

.model-select-arrow svg {
    width: 14px;
    height: 14px;
}

.model-badges {
    display: flex;
    gap: 6px;
    flex-shrink: 0;
}

.model-badge {
    font-size: 11px;
    font-weight: 500;
    white-space: nowrap;
    padding: 3px 8px;
    border-radius: var(--radius-control);
    border: 1px solid;
}

.think-badge {
    color: var(--accent);
    background: var(--accent-subtle);
    border-color: rgba(96, 205, 255, 0.15);
}

.vision-badge {
    color: var(--success);
    background: var(--success-bg);
    border-color: rgba(108, 203, 95, 0.15);
}

.rag-badge {
    color: #B388FF;
    background: rgba(179, 136, 255, 0.06);
    border-color: rgba(179, 136, 255, 0.15);
}

/* ── 预设栏 ── */
.preset-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: var(--bg-layer-alt);
    border-bottom: 1px solid var(--border-subtle);
    flex-shrink: 0;
}

.preset-list {
    display: flex;
    gap: 6px;
    flex: 1;
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: none;
    -ms-overflow-style: none;
    padding: 2px 0;
}

.preset-list::-webkit-scrollbar { display: none; }

.preset-chip {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 4px 12px;
    border-radius: var(--radius-control);
    border: 1px solid var(--border-default);
    background: var(--bg-layer);
    color: var(--text-secondary);
    font-size: 12px;
    font-family: var(--font);
    white-space: nowrap;
    cursor: pointer;
    transition: var(--transition);
    flex-shrink: 0;
    user-select: none;
}

.preset-chip:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-strong);
    color: var(--text-primary);
}

.preset-chip.active {
    background: var(--accent-subtle);
    border-color: var(--accent);
    color: var(--accent);
    font-weight: 600;
}

.preset-chip.active:hover {
    background: var(--accent-subtle-hover);
}

.preset-chip-icon {
    font-size: 13px;
    line-height: 1;
}

.preset-chip-name {
    line-height: 1;
}

.preset-add-btn {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-control);
    border: 1px dashed var(--border-default);
    background: transparent;
    color: var(--text-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    flex-shrink: 0;
}

.preset-add-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-subtle);
}

.preset-add-btn svg {
    width: 14px;
    height: 14px;
}

/* ── 预设模态框 ── */
.preset-name-row {
    display: flex;
    gap: 8px;
    align-items: center;
}

.preset-icon-input {
    width: 52px !important;
    text-align: center;
    font-size: 16px;
    flex-shrink: 0;
    padding: 6px 4px !important;
}

.preset-temp-slider {
    width: 100%;
    -webkit-appearance: none;
    appearance: none;
    height: 4px;
    border-radius: 2px;
    background: var(--bg-layer);
    outline: none;
    margin: 8px 0;
}

.preset-temp-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    box-shadow: 0 0 0 4px transparent;
    transition: box-shadow var(--transition);
}

.preset-temp-slider::-webkit-slider-thumb:hover {
    box-shadow: 0 0 0 3px var(--accent-subtle);
}

.preset-temp-slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    border: none;
}

.preset-modal-actions {
    display: flex;
    gap: 8px;
    align-items: center;
    margin-top: 16px;
    padding-top: 12px;
    border-top: 1px solid var(--border-subtle);
}

/* ── Think 按钮 ── */
.think-toggle {
    display: flex;
    align-items: center;
    cursor: pointer;
    flex-shrink: 0;
    user-select: none;
}

.think-toggle input { display: none; }

.think-btn {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-control);
    background: var(--bg-layer);
    border: 1px solid var(--border-default);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    color: var(--text-tertiary);
}

.think-btn svg {
    width: 18px;
    height: 18px;
}

.think-toggle:not(.unavailable):hover .think-btn {
    border-color: var(--border-strong);
    color: var(--text-secondary);
}

.think-toggle input:checked + .think-btn {
    background: var(--accent-subtle);
    border-color: var(--accent);
    color: var(--accent);
}

.think-toggle input:checked + .think-btn:hover {
    background: var(--accent-subtle-hover);
}

.think-toggle.unavailable .think-btn {
    opacity: 0.36;
    cursor: not-allowed;
}

/* ── 开关控件 (WinUI ToggleSwitch) ── */
.toggle-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--text-secondary);
    cursor: pointer;
    user-select: none;
    white-space: nowrap;
}

.toggle-label input { display: none; }

.toggle-slider {
    position: relative;
    width: 40px;
    height: 20px;
    background: var(--bg-layer);
    border: 1px solid var(--border-default);
    border-radius: 10px;
    transition: var(--transition);
}

.toggle-slider::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 14px;
    height: 14px;
    background: var(--text-secondary);
    border-radius: 50%;
    transition: var(--transition);
}

.toggle-label input:checked + .toggle-slider {
    background: var(--accent);
    border-color: var(--accent);
}

.toggle-label input:checked + .toggle-slider::after {
    transform: translateX(20px);
    background: var(--bg-solid);
}

/* ═══ 聊天区域 ═══ */
.chat-area {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 16px;
    scroll-behavior: smooth;
}

.chat-area::-webkit-scrollbar {
    width: 8px;
}

.chat-area::-webkit-scrollbar-track {
    background: transparent;
}

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

.chat-area::-webkit-scrollbar-thumb:hover {
    background: var(--border-strong);
}

/* ── 回到底部按钮 ── */
.scroll-to-bottom {
    position: sticky;
    bottom: 16px;
    float: right;
    margin-right: 4px;
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border: 1px solid var(--border-default);
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-control);
    color: var(--text-secondary);
    font-size: 12px;
    font-family: var(--font);
    cursor: pointer;
    z-index: 5;
    box-shadow: var(--shadow-flyout);
    transition: var(--transition);
    animation: fadeSlideUp 167ms ease;
}

.scroll-to-bottom:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-strong);
    color: var(--text-primary);
}

.scroll-to-bottom:active {
    transform: scale(0.98);
}

.scroll-to-bottom svg {
    width: 14px;
    height: 14px;
}

@keyframes fadeSlideUp {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ── 空状态 ── */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    gap: 12px;
    color: var(--text-tertiary);
}

.empty-icon svg {
    width: 80px;
    height: 80px;
    opacity: 0.3;
    color: var(--text-tertiary);
}

.empty-state h2 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.empty-state p {
    font-size: 14px;
    color: var(--text-tertiary);
}

/* ── 消息气泡 ── */
.messages {
    display: flex;
    flex-direction: column;
    gap: 12px;
    max-width: 780px;
    margin: 0 auto;
}

.message {
    display: flex;
    gap: 12px;
    animation: fadeSlideUp 167ms ease;
}

.msg-avatar {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    border-radius: var(--radius-control);
    background: var(--bg-layer);
    border: 1px solid var(--border-subtle);
}

.msg-body {
    flex: 1;
    min-width: 0;
}

.msg-role {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-tertiary);
    margin-bottom: 4px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.model-tag {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    color: var(--accent);
    background: var(--accent-subtle);
    border: 1px solid rgba(96, 205, 255, 0.15);
    border-radius: var(--radius-control);
    padding: 1px 8px;
    line-height: 1.5;
    white-space: nowrap;
}

.message.user .msg-body {
    background: var(--bg-layer);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 10px 14px;
}

.message.assistant .msg-body {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 10px 14px;
}

.msg-content {
    font-size: 14px;
    line-height: 1.65;
    word-break: break-word;
}

.msg-content pre {
    background: var(--bg-solid);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-control);
    padding: 12px 14px;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 13px;
    margin: 8px 0;
}

.msg-content code {
    background: rgba(255, 255, 255, 0.06);
    padding: 1px 5px;
    border-radius: 3px;
    font-family: var(--font-mono);
    font-size: 0.9em;
}

.msg-content pre code {
    background: none;
    padding: 0;
}

.msg-content p { margin-bottom: 8px; }
.msg-content p:last-child { margin-bottom: 0; }

/* 思考块 */
.think-block {
    margin-bottom: 8px;
    border: 1px solid rgba(252, 225, 0, 0.12);
    border-radius: var(--radius-control);
    overflow: hidden;
}

.think-header {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 10px;
    background: var(--caution-bg);
    color: var(--caution);
    font-size: 12px;
    cursor: pointer;
    user-select: none;
}

.think-header .chevron {
    margin-left: auto;
    transition: transform var(--transition);
}

.think-header .chevron.expanded {
    transform: rotate(180deg);
}

.think-content {
    padding: 8px 12px;
    background: rgba(252, 225, 0, 0.02);
}

.think-content pre {
    font-size: 12px;
    color: var(--text-secondary);
    white-space: pre-wrap;
    word-break: break-word;
    margin: 0;
    background: none;
    border: none;
    padding: 0;
}

/* 打字光标 */
.typing-cursor {
    display: inline-block;
    width: 2px;
    height: 1em;
    background: var(--accent);
    animation: caretBlink 1s step-end infinite;
    vertical-align: text-bottom;
    margin-left: 1px;
}

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

/* ═══ Loading 动画 ═══ */
.loading-dots {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 8px 0;
}

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

.loading-dots span:nth-child(1) { animation-delay: 0s; }
.loading-dots span:nth-child(2) { animation-delay: 0.2s; }
.loading-dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes dotPulse {
    0%, 80%, 100% { transform: scale(0.6); opacity: 0.3; }
    40% { transform: scale(1); opacity: 1; }
}

.loading-text {
    font-size: 12px;
    color: var(--text-tertiary);
    animation: loadingFade 1.5s ease-in-out infinite;
}

@keyframes loadingFade {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 0.8; }
}

/* 消息图片 */
.msg-images {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 8px;
}

.msg-img {
    max-width: 200px;
    max-height: 200px;
    border-radius: var(--radius-control);
    border: 1px solid var(--border-subtle);
    object-fit: cover;
}

.msg-img[data-lightbox] {
    cursor: zoom-in;
    transition: var(--transition);
}

.msg-img[data-lightbox]:hover {
    opacity: 0.85;
}

/* 文件 chip */
.msg-files {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 8px;
}

.msg-files .file-chip {
    background: var(--accent-subtle);
    border-color: rgba(96, 205, 255, 0.12);
}

/* 统计信息 */
.msg-stats {
    display: flex;
    gap: 12px;
    margin-top: 6px;
    font-size: 11px;
    color: var(--text-tertiary);
}

/* RAG 知识库来源 */
.rag-sources {
    margin-top: 8px;
    padding: 8px 12px;
    background: var(--accent-subtle);
    border: 1px solid rgba(96, 205, 255, 0.1);
    border-radius: var(--radius-control);
    font-size: 12px;
}

.rag-sources-header {
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 4px;
    font-size: 11px;
}

.rag-source-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 3px 0;
    color: var(--text-tertiary);
}

.rag-source-item + .rag-source-item {
    border-top: 1px solid var(--border-subtle);
}

.rag-source-name {
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.rag-source-score {
    color: var(--success);
    font-weight: 500;
    margin-left: 8px;
    flex-shrink: 0;
}

/* ═══ 输入区域 ═══ */
.input-area {
    flex-shrink: 0;
    padding: 10px 16px 14px;
    background: var(--bg-mica);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-top: 1px solid var(--border-subtle);
}

.image-preview {
    display: flex;
    gap: 8px;
    padding: 8px 0;
    flex-wrap: wrap;
}

.preview-thumb {
    position: relative;
    width: 56px;
    height: 56px;
    border-radius: var(--radius-control);
    overflow: hidden;
    border: 1px solid var(--border-default);
}

.preview-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.remove-img {
    position: absolute;
    top: 2px;
    right: 2px;
    width: 18px;
    height: 18px;
    border: none;
    background: var(--critical);
    color: white;
    border-radius: 50%;
    font-size: 12px;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 文件预览 */
.file-preview {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    padding: 8px 0;
}

.file-chip {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border-radius: var(--radius-control);
    background: var(--accent-subtle);
    border: 1px solid rgba(96, 205, 255, 0.12);
    font-size: 12px;
    line-height: 1;
    transition: var(--transition);
    animation: fadeSlideUp 167ms ease;
}

.file-chip:hover {
    background: var(--accent-subtle-hover);
    border-color: rgba(96, 205, 255, 0.2);
}

.file-icon {
    font-size: 13px;
    flex-shrink: 0;
}

.file-name {
    font-weight: 600;
    color: var(--text-primary);
    max-width: 160px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-size {
    color: var(--text-tertiary);
    flex-shrink: 0;
}

.remove-file {
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    font-size: 14px;
    line-height: 1;
    padding: 0 2px;
    border-radius: 3px;
    transition: var(--transition);
}

.remove-file:hover {
    color: var(--critical);
    background: var(--critical-bg);
}

.input-row {
    display: flex;
    align-items: flex-end;
    gap: 8px;
}

.attach-btn {
    flex-shrink: 0;
}

.chat-input {
    flex: 1;
    padding: 8px 12px;
    background: var(--bg-layer);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-control);
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 14px;
    resize: none;
    outline: none;
    min-height: 36px;
    max-height: 120px;
    line-height: 1.5;
    transition: var(--transition);
}

.chat-input:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 1px var(--border-focus);
}

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

.send-btn {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    border: none;
    border-radius: var(--radius-control);
    background: var(--accent);
    color: #1a1a1a;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

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

.send-btn:active {
    transform: scale(0.96);
}

.send-btn.disabled {
    opacity: 0.36;
    cursor: not-allowed;
    pointer-events: none;
}

.send-btn svg {
    width: 16px;
    height: 16px;
}

.send-btn.stop-btn {
    background: var(--critical);
    color: white;
}

.send-btn.stop-btn:hover {
    opacity: 0.9;
}

.spinner {
    width: 16px;
    height: 16px;
    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); }
}

/* ═══ 历史只读提示栏 ═══ */
.history-view-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 16px;
    background: rgba(96, 205, 255, 0.04);
    border-top: 1px solid rgba(96, 205, 255, 0.1);
    font-size: 13px;
    color: var(--accent);
    flex-shrink: 0;
}

/* ═══ 模态框 (WinUI ContentDialog 风格) ═══ */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    animation: overlayIn 167ms ease;
    padding: 20px;
}

@keyframes overlayIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal {
    background: var(--bg-card);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-dialog);
    width: 100%;
    max-width: 480px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    animation: dialogIn 200ms cubic-bezier(0, 0, 0, 1);
    overflow: hidden;
}

@keyframes dialogIn {
    from { opacity: 0; transform: scale(0.96) translateY(8px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-lg {
    max-width: 860px;
    width: 96vw;
    max-height: 85vh;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-subtle);
    flex-shrink: 0;
}

.modal-header h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-body {
    padding: 16px 20px;
    overflow-y: auto;
    flex: 1;
}

/* ── 设置项 ── */
.setting-group {
    margin-bottom: 16px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-subtle);
}

.setting-group:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.setting-label {
    display: flex;
    align-items: center;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.setting-input {
    width: 100%;
    padding: 8px 10px;
    background: var(--bg-layer);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-control);
    color: var(--text-primary);
    font-size: 13px;
    font-family: var(--font);
    outline: none;
    margin-bottom: 6px;
    transition: var(--transition);
}

.setting-input:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 1px var(--border-focus);
}

.setting-input::placeholder {
    color: var(--text-disabled);
}

/* ── 按钮 (WinUI Button 风格) ── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 6px 16px;
    border: 1px solid transparent;
    border-radius: var(--radius-control);
    font-size: 13px;
    font-weight: 400;
    font-family: var(--font);
    cursor: pointer;
    transition: var(--transition);
    gap: 6px;
    position: relative;
    outline: none;
}

.btn::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: currentColor;
    opacity: 0;
    transition: var(--transition);
}

.btn:hover::before { opacity: 0.06; }
.btn:active::before { opacity: 0.04; }

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background: var(--accent);
    color: #1a1a1a;
    border-color: transparent;
}

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

.btn-primary::before { display: none; }

.btn-outline {
    background: var(--bg-layer);
    border: 1px solid var(--border-default);
    color: var(--text-secondary);
}

.btn-outline:hover {
    border-color: var(--border-strong);
    color: var(--text-primary);
}

.btn-danger {
    background: var(--critical-bg);
    border: 1px solid rgba(241, 112, 123, 0.15);
    color: var(--critical);
}

.btn-danger:hover {
    background: rgba(241, 112, 123, 0.1);
}

.btn-sm {
    padding: 4px 10px;
    font-size: 12px;
}

/* ── 连接信息 ── */
.connection-info {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}

.status-badge {
    padding: 3px 10px;
    border-radius: var(--radius-control);
    font-size: 12px;
    font-weight: 500;
}

.status-badge.success {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid rgba(108, 203, 95, 0.15);
}

.status-badge.error {
    background: var(--critical-bg);
    color: var(--critical);
    border: 1px solid rgba(241, 112, 123, 0.15);
}

.status-badge.warning {
    background: var(--caution-bg);
    color: var(--caution);
    border: 1px solid rgba(252, 225, 0, 0.15);
}

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

.cors-hint {
    padding: 10px;
    background: var(--caution-bg);
    border: 1px solid rgba(252, 225, 0, 0.1);
    border-radius: var(--radius-control);
    margin-top: 8px;
}

.cors-hint p {
    font-size: 12px;
    color: var(--caution);
    margin-bottom: 6px;
}

.cors-hint code {
    display: block;
    padding: 8px;
    background: var(--bg-solid);
    border-radius: 3px;
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--accent);
    user-select: all;
}

/* ── 运行中的模型 ── */
.running-models {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 10px;
}

.running-model {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 10px;
    background: var(--bg-layer);
    border-radius: var(--radius-control);
    border: 1px solid var(--border-subtle);
}

.running-model .model-name {
    flex: 1;
    font-size: 13px;
    font-weight: 500;
}

.running-model .model-vram {
    font-size: 12px;
    color: var(--text-tertiary);
    font-family: var(--font-mono);
}

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

/* ── 历史记录 ── */
.history-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.history-search-wrap {
    position: relative;
    margin-bottom: 10px;
}

.history-search-input {
    width: 100%;
    padding: 8px 32px 8px 12px;
    background: var(--bg-layer);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-control);
    color: var(--text-primary);
    font-size: 13px;
    font-family: var(--font);
    outline: none;
    transition: var(--transition);
}

.history-search-input::placeholder {
    color: var(--text-disabled);
}

.history-search-input:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 1px var(--border-focus);
}

.history-search-clear {
    position: absolute;
    right: 6px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    font-size: 14px;
    padding: 4px;
    line-height: 1;
}

.history-search-clear:hover {
    color: var(--text-primary);
}

.history-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 10px;
    border-radius: var(--radius-control);
    transition: var(--transition);
}

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

.history-info {
    flex: 1;
    min-width: 0;
    cursor: pointer;
}

.history-title {
    font-size: 13px;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.history-meta {
    display: flex;
    gap: 10px;
    font-size: 11px;
    color: var(--text-tertiary);
    margin-top: 2px;
}

.history-actions {
    display: flex;
    gap: 2px;
    flex-shrink: 0;
}

/* ── 历史分页 ── */
.history-pagination {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 0 4px;
    border-top: 1px solid var(--border-subtle);
    margin-top: 8px;
}

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

.page-buttons {
    display: flex;
    align-items: center;
    gap: 4px;
}

.page-btn {
    min-width: 30px;
    height: 30px;
    border: 1px solid var(--border-default);
    background: var(--bg-layer);
    color: var(--text-secondary);
    border-radius: var(--radius-control);
    font-size: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.page-btn:hover:not(.disabled):not(.active) {
    border-color: var(--border-strong);
    color: var(--text-primary);
}

.page-btn.active {
    background: var(--accent-subtle);
    border-color: var(--accent);
    color: var(--accent);
    font-weight: 600;
}

.page-btn.disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.page-ellipsis {
    color: var(--text-disabled);
    font-size: 12px;
    padding: 0 2px;
}

/* ═══ Lightbox ═══ */
.lightbox-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 300;
    cursor: zoom-out;
    animation: overlayIn 167ms ease;
}

.lightbox-img {
    max-width: 90vw;
    max-height: 90vh;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-dialog);
    object-fit: contain;
    cursor: default;
}

.lightbox-close {
    position: fixed;
    top: 16px;
    right: 20px;
    width: 36px;
    height: 36px;
    border: 1px solid var(--border-default);
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 16px;
    border-radius: var(--radius-control);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    z-index: 301;
}

.lightbox-close:hover {
    background: var(--bg-card-hover);
}

/* ═══ 帮助弹框 ═══ */
#helpModal .modal {
    max-width: 600px;
    max-height: 85vh;
}

.help-section {
    margin-bottom: 16px;
    padding: 12px 14px;
    background: var(--bg-layer);
    border-radius: var(--radius-control);
    border-left: 2px solid var(--border-strong);
    transition: border-color var(--transition);
}

.help-section:hover {
    border-left-color: var(--accent);
}

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

.help-section h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.help-section ul,
.help-section ol {
    padding-left: 18px;
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.help-section li {
    margin-bottom: 3px;
}

.help-section code {
    background: rgba(255, 255, 255, 0.06);
    color: var(--accent);
    padding: 1px 6px;
    border-radius: 3px;
    font-size: 12px;
}

.help-section kbd {
    background: var(--bg-layer);
    border: 1px solid var(--border-default);
    border-bottom-width: 2px;
    border-radius: 3px;
    padding: 1px 6px;
    font-size: 12px;
    font-family: inherit;
    color: var(--text-primary);
}

.help-shortcuts {
    width: 100%;
    font-size: 13px;
    border-collapse: collapse;
    border-radius: var(--radius-control);
    overflow: hidden;
    border: 1px solid var(--border-default);
}

.help-shortcuts td {
    padding: 6px 10px;
    border-bottom: 1px solid var(--border-subtle);
}

.help-shortcuts tr:last-child td {
    border-bottom: none;
}

.help-shortcuts td:first-child {
    width: 140px;
    text-align: center;
    background: var(--bg-layer);
}

.help-shortcuts tr:hover td {
    background: var(--bg-layer-alt);
}

/* ═══ 知识库管理 ═══ */
#kbModal .modal-body {
    padding: 16px 20px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.kb-layout {
    display: flex;
    gap: 16px;
    flex: 1;
    min-height: 0;
    overflow: hidden;
}

.kb-sidebar {
    width: 240px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
    min-height: 0;
    overflow: hidden;
    padding-right: 16px;
    border-right: 1px solid var(--border-subtle);
}

.kb-new-collection {
    display: flex;
    gap: 6px;
}

.kb-new-collection .setting-input {
    flex: 1;
    margin-bottom: 0;
    font-size: 13px;
    padding: 6px 10px;
}

.kb-collection-list {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-height: 0;
}

.kb-collection-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 12px;
    border-radius: var(--radius-control);
    cursor: pointer;
    transition: var(--transition);
}

.kb-collection-item:hover {
    background: var(--bg-layer);
}

.kb-collection-item.active {
    background: var(--accent-subtle);
    border: 1px solid rgba(96, 205, 255, 0.12);
}

.kb-col-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.kb-col-name {
    font-size: 13px;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.kb-col-stats {
    font-size: 11px;
    color: var(--text-tertiary);
}

.kb-col-delete {
    opacity: 0;
    transition: opacity var(--transition);
}

.kb-collection-item:hover .kb-col-delete {
    opacity: 1;
}

.kb-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-width: 0;
    min-height: 0;
    overflow: hidden;
}

.kb-toolbar {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
    flex-wrap: wrap;
    padding: 8px 12px;
    background: var(--bg-layer);
    border-radius: var(--radius-control);
    border: 1px solid var(--border-subtle);
}

.kb-embed-select {
    flex: 1;
    min-width: 0;
    max-width: 200px;
    padding: 5px 8px;
    font-size: 12px;
    background: var(--bg-layer-alt);
    color: var(--text-primary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-control);
    outline: none;
    cursor: pointer;
    font-family: var(--font);
}

.kb-embed-select:focus {
    border-color: var(--border-focus);
}

.kb-rag-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-left: auto;
    white-space: nowrap;
    padding-left: 8px;
    border-left: 1px solid var(--border-subtle);
}

.kb-progress {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--text-tertiary);
    padding: 3px 8px;
    background: var(--accent-subtle);
    border-radius: var(--radius-control);
}

.kb-doc-list {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-height: 0;
}

.kb-doc-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: var(--radius-control);
    transition: var(--transition);
}

.kb-doc-item:hover {
    background: var(--bg-layer);
}

.kb-doc-icon {
    font-size: 16px;
    flex-shrink: 0;
}

.kb-doc-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1px;
    min-width: 0;
}

.kb-doc-name {
    font-size: 13px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.kb-doc-meta {
    font-size: 11px;
    color: var(--text-tertiary);
}

.kb-doc-delete {
    opacity: 0;
    transition: opacity var(--transition);
}

.kb-doc-item:hover .kb-doc-delete {
    opacity: 1;
}

/* ── 移动端响应式 ── */
@media (max-width: 640px) {
    .kb-layout {
        flex-direction: column;
    }

    .kb-sidebar {
        width: 100%;
        max-height: 160px;
        border-right: none;
        padding-right: 0;
        padding-bottom: 10px;
        border-bottom: 1px solid var(--border-subtle);
    }

    .kb-main {
        min-height: 180px;
    }

    .modal-lg {
        max-height: 92vh;
    }
}

/* ═══ Toast 通知 ═══ */
.toast-container {
    position: fixed;
    top: 56px;
    right: 16px;
    z-index: 200;
    display: flex;
    flex-direction: column;
    gap: 6px;
    pointer-events: none;
}

.toast {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    border-radius: var(--radius-control);
    background: var(--bg-card);
    border: 1px solid var(--border-default);
    box-shadow: var(--shadow-flyout);
    font-size: 13px;
    color: var(--text-primary);
    pointer-events: auto;
    animation: toastIn 167ms ease;
    max-width: 320px;
}

.toast.removing {
    animation: toastOut 167ms ease forwards;
}

.toast-icon {
    font-size: 14px;
    flex-shrink: 0;
}

.toast.success { border-left: 3px solid var(--success); }
.toast.error { border-left: 3px solid var(--critical); }
.toast.warning { border-left: 3px solid var(--caution); }
.toast.info { border-left: 3px solid var(--accent); }

@keyframes toastIn {
    from { opacity: 0; transform: translateX(24px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes toastOut {
    from { opacity: 1; transform: translateX(0); }
    to { opacity: 0; transform: translateX(24px); }
}

/* ═══ 响应式 ═══ */
@media (min-width: 768px) {
    .app-header { padding: 8px 24px; }
    .model-bar { padding: 8px 24px; }
    .chat-area { padding: 20px 24px; }
    .messages { max-width: 820px; }
    .input-area { padding: 10px 24px 16px; }
    .modal { max-width: 500px; }
}

@media (min-width: 1024px) {
    .messages { max-width: 900px; }
    #historyModal .modal { max-width: 620px; }
}

/* ── 选中文本 ── */
::selection {
    background: rgba(96, 205, 255, 0.3);
}

/* ── 链接 ── */
.msg-content a {
    color: var(--accent);
    text-decoration: none;
}

.msg-content a:hover {
    text-decoration: underline;
}

.msg-content .blocked-link {
    color: var(--critical);
    text-decoration: line-through;
    cursor: not-allowed;
    opacity: 0.7;
}

/* ── 列表 ── */
.msg-content ul, .msg-content ol {
    padding-left: 20px;
    margin: 8px 0;
}

.msg-content li { margin-bottom: 3px; }

/* ── 表格 ── */
.msg-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 8px 0;
    font-size: 13px;
}

.msg-content th, .msg-content td {
    padding: 6px 10px;
    border: 1px solid var(--border-default);
    text-align: left;
}

.msg-content th {
    background: var(--bg-layer);
    font-weight: 600;
}

/* ── 引用块 ── */
.msg-content blockquote {
    border-left: 2px solid var(--border-strong);
    padding-left: 12px;
    margin: 8px 0;
    color: var(--text-secondary);
}