/* Arch Voice Chat - Simplified Styles */

/* =============================================================================
   Theme Variables
   ============================================================================= */
:root {
    /* Color Palette */
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-secondary: #6b7280;
    --color-success: #10b981;
    --color-error: #ef4444;
    --color-warning: #f59e0b;

    /* Background Colors */
    --bg-base: #f3f4f6;
    --bg-dark: #1f2937;
    --bg-surface: #ffffff;
    --bg-hover: #e5e7eb;
    --bg-muted: #d1d5db;
    --bg-user-msg: #dbeafe;
    --bg-assistant-msg: #f3f4f6;

    /* Text Colors */
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;

    /* Border */
    --border-color: #e5e7eb;

    /* Layout Sizes */
    --header-height: 60px;
    --status-bar-height: 32px;
    --sidebar-width: 280px;
    --button-size: 90px;
    --button-size-md: 50px;
    --button-size-sm: 44px;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 0.75rem;
    --space-lg: 1rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.2s ease;
    --transition-slow: 0.3s ease;
}

/* =============================================================================
   Reset & Base
   ============================================================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-primary);
    background: var(--bg-base);
    overflow: hidden;
}

#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    height: 100dvh; /* Dynamic viewport height - accounts for mobile browser chrome */
    overflow: hidden;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

/* =============================================================================
   Header
   ============================================================================= */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    padding: 0 var(--space-lg);
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.header-left, .header-right { flex: 1; display: flex; align-items: center; }
.header-right { justify-content: flex-end; }
.header-center { flex: 2; display: flex; justify-content: center; }

.logo { font-size: 1.25rem; font-weight: 600; }

/* Menu Button */
.menu-btn {
    display: none;
    background: none;
    border: none;
    padding: var(--space-sm);
    cursor: pointer;
    margin-right: var(--space-md);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
}

.menu-btn:hover {
    color: var(--color-primary);
    background: rgba(0, 0, 0, 0.05);
    border-radius: var(--radius-md);
}

.menu-icon {
    width: 28px;
    height: 3px;
    background: currentColor;
    display: block;
    position: relative;
    margin: auto;
}

.menu-icon::before, .menu-icon::after {
    content: '';
    position: absolute;
    width: 28px;
    height: 3px;
    background: currentColor;
    left: 0;
    transition: transform var(--transition-slow);
}

.menu-icon::before { top: -8px; }
.menu-icon::after { top: 8px; }

/* Model Selector */
.model-select {
    padding: var(--space-sm) var(--space-lg);
    font-size: 0.875rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-surface);
    cursor: pointer;
    min-width: 200px;
}

.model-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
}

/* =============================================================================
   Buttons
   ============================================================================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    font-size: 0.875rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.btn-primary {
    background: var(--color-primary);
    color: white;
    border-radius: var(--radius-full);
    width: var(--button-size);
    height: var(--button-size);
    padding: 0;
    font-size: 0.95rem;
    font-weight: 600;
}

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

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

.btn-secondary:hover:not(:disabled) { background: var(--bg-base); }

/* Circular Icon Buttons (Record, TTS) */
.btn-circle {
    background: var(--bg-surface);
    color: var(--text-primary);
    border: 3px solid var(--color-primary);
    border-radius: var(--radius-full);
    width: var(--button-size);
    height: var(--button-size);
    padding: 16px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
}

.btn-circle .icon {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* Attach Button */
.attach-icon {
    width: 130% !important;
    height: 130% !important;
    filter: brightness(0) saturate(100%) invert(31%) sepia(96%) saturate(2383%) hue-rotate(213deg) brightness(96%) contrast(91%);
    position: relative;
    left: -5%;
    top: 5%;
}

#attach-file-btn:hover:not(:disabled) .attach-icon {
    filter: brightness(0) saturate(100%) invert(23%) sepia(98%) saturate(3180%) hue-rotate(221deg) brightness(93%) contrast(94%);
}

/* TTS Button */
.btn-tts {
    border-color: var(--text-muted);
    margin-right: 12px;
    cursor: pointer;
}

.btn-tts .tts-icon {
    width: 72px;
    height: 72px;
    filter: brightness(0) saturate(0%) invert(61%) sepia(11%) saturate(296%) hue-rotate(182deg) brightness(93%) contrast(91%);
}

.btn-tts.speaking {
    border-color: var(--color-success);
    border-width: 5px;
    animation: pulse 1.5s infinite;
}

.btn-tts.speaking .tts-icon {
    filter: brightness(0) saturate(100%) invert(64%) sepia(98%) saturate(451%) hue-rotate(81deg) brightness(94%) contrast(85%);
}

/* Record Button */
.btn-record .record-icon {
    filter: brightness(0) saturate(100%) invert(31%) sepia(96%) saturate(2383%) hue-rotate(213deg) brightness(96%) contrast(91%);
}

.btn-record:hover:not(:disabled) { border-color: var(--color-primary-hover); }

.btn-record:hover:not(:disabled) .record-icon {
    filter: brightness(0) saturate(100%) invert(23%) sepia(98%) saturate(3180%) hue-rotate(221deg) brightness(93%) contrast(94%);
}

.btn-record.recording {
    border-color: var(--color-error);
    border-width: 5px;
    animation: pulse 1.5s infinite;
}

.btn-record.recording .record-icon { filter: brightness(0); }

.btn-record.processing {
    background: var(--color-warning);
    border-color: var(--color-warning);
}

.btn-record.processing .record-icon { filter: brightness(0) invert(1); }

.btn-record.hands-free-active {
    background: rgba(37, 99, 235, 0.3);
    border-color: var(--color-primary);
}

.btn-record .record-text { display: none; }

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

/* =============================================================================
   Layout
   ============================================================================= */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
    min-height: 0; /* Important for flex children to shrink properly */
}

/* =============================================================================
   Sidebar
   ============================================================================= */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-surface);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: transform var(--transition-slow);
    position: relative;
    z-index: 100;
}

.sidebar-close-btn {
    display: none; /* Hidden on desktop */
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 32px;
    height: 60px;
    background: var(--color-primary);
    border: none;
    border-radius: var(--radius-md) 0 0 var(--radius-md);
    cursor: pointer;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
    z-index: 101;
    box-shadow: var(--shadow-sm);
}

.sidebar-close-btn:hover {
    background: var(--color-primary-hover);
    width: 36px;
}

.sidebar-close-icon {
    font-size: 1.25rem;
    color: white;
    transition: transform var(--transition-normal);
}

.sidebar-section {
    display: flex;
    flex-direction: column;
    flex: 1;
    overflow: hidden;
}

.sidebar-section-header {
    width: 100%;
    padding: 0.875rem var(--space-lg);
    background: var(--bg-hover);
    border: none;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-align: left;
    transition: all var(--transition-normal);
}

.sidebar-section-header:hover { background: var(--bg-muted); color: var(--text-primary); }

.section-arrow {
    font-size: 0.75rem;
    transition: transform var(--transition-normal);
}

.sidebar-section-header[aria-expanded="false"] .section-arrow { transform: rotate(-90deg); }

/* Conversation List */
.conversation-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-sm);
    max-height: 1000px;
    transition: all var(--transition-slow);
    opacity: 1;
}

.conversation-list.collapsed {
    max-height: 0;
    padding: 0;
    overflow: hidden;
    opacity: 0;
}

.conversation-item {
    padding: var(--space-md) var(--space-lg);
    margin-bottom: var(--space-xs);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.conversation-item:hover { background: var(--bg-base); }
.conversation-item.active { background: var(--color-primary); color: white; }

.conversation-item .title {
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conversation-item .meta {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: var(--space-xs);
}

.conversation-item.active .meta { color: rgba(255, 255, 255, 0.7); }

/* Conversation Actions */
.conversation-item-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.conversation-item-content { flex: 1; min-width: 0; }

.conversation-menu-btn {
    padding: var(--space-xs) var(--space-sm);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1.25rem;
    line-height: 1;
    border-radius: var(--radius-sm);
    opacity: 0;
    transition: all var(--transition-fast);
}

.conversation-item-wrapper:hover .conversation-menu-btn { opacity: 1; }
.conversation-menu-btn:hover { background: rgba(0, 0, 0, 0.1); color: var(--text-primary); }
.conversation-item.active .conversation-menu-btn { color: rgba(255, 255, 255, 0.7); }
.conversation-item.active .conversation-menu-btn:hover { background: rgba(255, 255, 255, 0.2); color: white; }

/* Dropdown Menu */
.conversation-dropdown {
    position: absolute;
    right: 0;
    top: 100%;
    margin-top: var(--space-xs);
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    min-width: 140px;
    z-index: 1000;
    display: none;
}

.conversation-dropdown.show { display: block; }

.conversation-dropdown-item {
    padding: 0.625rem var(--space-lg);
    font-size: 0.875rem;
    color: var(--text-primary);
    background: none;
    border: none;
    width: 100%;
    text-align: left;
    cursor: pointer;
    transition: background var(--transition-fast);
}

.conversation-dropdown-item:first-child { border-radius: var(--radius-md) var(--radius-md) 0 0; }
.conversation-dropdown-item:last-child { border-radius: 0 0 var(--radius-md) var(--radius-md); }
.conversation-dropdown-item:hover { background: var(--bg-base); }
.conversation-dropdown-item.danger { color: var(--color-error); }
.conversation-dropdown-item.danger:hover { background: #fee2e2; }

/* Clear All Button */
.clear-all-btn {
    width: 100%;
    padding: 0.625rem var(--space-lg);
    margin: var(--space-sm) 0;
    background: var(--bg-base);
    color: var(--text-primary);
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.clear-all-btn:hover { background: var(--bg-hover); border-color: var(--color-primary-hover); }

/* Settings Section */
.sidebar-settings {
    border-top: 1px solid var(--border-color);
    padding: var(--space-lg);
    background: var(--bg-surface);
}

.settings-item { margin-bottom: var(--space-lg); }
.settings-item:last-child { margin-bottom: 0; }

.toggle-label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    user-select: none;
}

.toggle-text { font-size: 0.875rem; font-weight: 500; }

/* Toggle Switch */
.toggle-switch {
    position: relative;
    width: 48px;
    height: 26px;
    flex-shrink: 0;
}

.toggle-switch input { opacity: 0; width: 0; height: 0; position: absolute; }

.toggle-slider {
    position: absolute;
    cursor: pointer;
    inset: 0;
    background: #4a4a4a;
    border-radius: 26px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.3);
}

.toggle-slider::before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background: white;
    border-radius: 50%;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.toggle-switch input:checked + .toggle-slider { background: var(--color-primary); }
.toggle-switch input:checked + .toggle-slider::before { transform: translateX(22px); }
.toggle-switch input:focus + .toggle-slider { box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.3), 0 0 0 3px rgba(59, 130, 246, 0.3); }
.toggle-switch input:disabled + .toggle-slider { opacity: 0.4; cursor: not-allowed; }

.coming-soon { font-size: 0.75rem; color: var(--text-muted); font-style: italic; margin-top: var(--space-xs); display: block; }

/* =============================================================================
   Chat Container
   ============================================================================= */
.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--bg-base);
    position: relative;
}

/* Chat Messages */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.empty-state {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-secondary);
    text-align: center;
}

/* Messages */
.message {
    display: flex;
    gap: var(--space-md);
    max-width: 80%;
    animation: fadeIn var(--transition-normal);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.message.user { align-self: flex-end; flex-direction: row-reverse; }
.message.assistant { align-self: flex-start; }

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    flex-shrink: 0;
    color: white;
}

.message.user .message-avatar { background: var(--color-primary); }
.message.assistant .message-avatar { background: var(--color-secondary); }

.message-content {
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-lg);
    line-height: 1.5;
}

.message.user .message-content { background: var(--bg-user-msg); border-bottom-right-radius: var(--radius-sm); }
.message.assistant .message-content { background: var(--bg-assistant-msg); border-bottom-left-radius: var(--radius-sm); }

.message-meta {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-top: var(--space-xs);
    font-size: 0.75rem;
    color: var(--text-muted);
}

.input-type-icon { font-size: 0.875rem; }
.input-type-icon.voice::before { content: '\1F3A4'; }
.input-type-icon.text::before { content: '\2328\FE0F'; }

/* =============================================================================
   Markdown Content Styles (chat + artifacts)
   ============================================================================= */
.message-content h1,
.message-content h2,
.message-content h3,
.message-content h4,
.artifact-markdown h1,
.artifact-markdown h2,
.artifact-markdown h3,
.artifact-markdown h4 {
    margin-top: 1em;
    margin-bottom: 0.5em;
    font-weight: 600;
    line-height: 1.25;
}

.message-content h1, .artifact-markdown h1 { font-size: 1.5em; }
.message-content h2, .artifact-markdown h2 { font-size: 1.25em; }
.message-content h3, .artifact-markdown h3 { font-size: 1.1em; }

.message-content p,
.artifact-markdown p {
    margin: 0.5em 0;
}

.message-content ul,
.message-content ol,
.artifact-markdown ul,
.artifact-markdown ol {
    margin: 0.5em 0;
    padding-left: 1.5em;
}

.message-content li,
.artifact-markdown li {
    margin: 0.25em 0;
}

.message-content pre,
.artifact-markdown pre {
    background: #1e1e1e;
    color: #d4d4d4;
    padding: 1em;
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: 0.75em 0;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875em;
    line-height: 1.5;
}

.message-content code,
.artifact-markdown code {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.9em;
}

.message-content code:not(pre code),
.artifact-markdown code:not(pre code) {
    background: rgba(0, 0, 0, 0.08);
    padding: 0.2em 0.4em;
    border-radius: 3px;
}

.message-content blockquote,
.artifact-markdown blockquote {
    border-left: 4px solid var(--color-primary);
    margin: 0.75em 0;
    padding: 0.5em 1em;
    background: rgba(0, 0, 0, 0.03);
    color: var(--text-secondary);
}

.message-content table,
.artifact-markdown table {
    border-collapse: collapse;
    margin: 0.75em 0;
    width: 100%;
}

.message-content th,
.message-content td,
.artifact-markdown th,
.artifact-markdown td {
    border: 1px solid var(--border-color);
    padding: 0.5em 0.75em;
    text-align: left;
}

.message-content th,
.artifact-markdown th {
    background: var(--bg-hover);
    font-weight: 600;
}

.message-content hr,
.artifact-markdown hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 1em 0;
}

.message-content a,
.artifact-markdown a {
    color: var(--color-primary);
    text-decoration: none;
}

.message-content a:hover,
.artifact-markdown a:hover {
    text-decoration: underline;
}

/* =============================================================================
   Input Area
   ============================================================================= */
.input-area {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg);
    background: var(--bg-surface);
    border-top: 1px solid var(--border-color);
}

.text-input-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.message-input {
    width: 100%;
    height: var(--button-size);
    padding: var(--space-md) var(--space-lg);
    font-size: 0.875rem;
    font-family: inherit;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    resize: none;
    max-height: 150px;
    line-height: 1.5;
}

.message-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
}

/* File Input */
.file-input {
    display: none;
}

/* Attached Files Display */
.attached-files {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    padding: 0;
    min-height: 0;
}

.attached-files:empty {
    display: none;
}

.attached-file-chip {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs) var(--space-md);
    background: var(--bg-base);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    color: var(--text-primary);
    max-width: 200px;
}

.attached-file-name {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.attached-file-remove {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
    padding: 0;
    transition: color var(--transition-fast);
}

.attached-file-remove:hover {
    color: var(--color-error);
}

/* File Drop Zone */
.file-drop-zone {
    position: absolute;
    inset: 0;
    background: rgba(37, 99, 235, 0.95);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.file-drop-zone:not(.hidden) {
    pointer-events: auto;
    opacity: 1;
}

.file-drop-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-lg);
    color: white;
    text-align: center;
    padding: 2rem;
}

.file-drop-icon {
    width: 80px;
    height: 80px;
    stroke-width: 2;
}

.file-drop-text {
    font-size: 1.5rem;
    font-weight: 600;
}

.file-drop-hint {
    font-size: 0.875rem;
    opacity: 0.9;
}

/* =============================================================================
   Artifact Panel
   ============================================================================= */
.artifact-panel {
    position: relative;
    width: 500px;
    background: var(--bg-surface);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: transform var(--transition-slow), width var(--transition-slow);
    z-index: 50;
}

.artifact-panel.collapsed {
    width: 0;
    transform: translateX(100%);
    border-left: none;
}

.artifact-toggle {
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 32px;
    height: 60px;
    background: var(--color-primary);
    border: none;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
    z-index: 51;
    box-shadow: var(--shadow-sm);
}

.artifact-toggle:hover {
    background: var(--color-primary-hover);
    width: 36px;
}

/* When collapsed, move button to right edge of screen */
.artifact-panel.collapsed .artifact-toggle {
    left: auto;
    right: 0;
    border-radius: var(--radius-md) 0 0 var(--radius-md);
}

.artifact-toggle-icon {
    font-size: 1.25rem;
    color: white;
    transition: transform var(--transition-normal);
}

.artifact-panel:not(.collapsed) .artifact-toggle-icon {
    transform: rotate(180deg);
}

.artifact-content {
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

.artifact-header {
    padding: var(--space-lg);
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-base);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-lg);
}

.artifact-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.artifact-actions {
    display: flex;
    gap: var(--space-sm);
    align-items: center;
}

.artifact-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    font-size: 0.75rem;
    font-weight: 500;
    background: var(--bg-surface);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.artifact-btn:hover:not(:disabled) {
    background: var(--bg-base);
    border-color: var(--color-primary);
}

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

.artifact-btn-primary {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.artifact-btn-primary:hover:not(:disabled) {
    background: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
}

.artifact-body {
    flex: 1;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.artifact-editor {
    flex: 1;
    overflow: auto;
    padding: var(--space-lg);
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    background: #fafafa;
}

.artifact-editor pre {
    margin: 0;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.artifact-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-muted);
    text-align: center;
    gap: var(--space-sm);
}

.artifact-empty-hint {
    font-size: 0.75rem;
    max-width: 250px;
}

/* =============================================================================
   Status Bar
   ============================================================================= */
.status-bar {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    min-height: var(--status-bar-height);
    padding: var(--space-xs) var(--space-lg);
    background: var(--bg-dark);
    color: var(--text-muted);
    font-size: 0.75rem;
    flex-wrap: wrap;
}

.status-item { display: flex; align-items: center; gap: var(--space-sm); }
#mcp-status-container { display: flex; align-items: center; gap: 1.5rem; flex-wrap: wrap; }

.status-label { color: var(--text-muted); }
.status-value { font-weight: 500; }
.status-connected { color: var(--color-success); }
.status-disconnected { color: var(--color-error); }
.status-unknown { color: var(--text-muted); }

/* =============================================================================
   Overlays & Modals
   ============================================================================= */
.loading-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-lg);
    z-index: 1000;
    color: white;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px 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); } }

/* Toast Notifications */
.toast {
    position: fixed;
    bottom: 60px;
    left: 50%;
    transform: translateX(-50%);
    padding: var(--space-md) 1.5rem;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    box-shadow: var(--shadow-lg);
    z-index: 1001;
    animation: slideUp var(--transition-slow);
}

@keyframes slideUp {
    from { opacity: 0; transform: translate(-50%, 20px); }
    to { opacity: 1; transform: translate(-50%, 0); }
}

.toast-error { background: var(--color-error); color: white; }

.toast-close {
    background: none;
    border: none;
    color: inherit;
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

/* Sidebar Overlay */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: var(--status-bar-height);
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
    opacity: 0;
    transition: opacity var(--transition-slow);
}

.sidebar-overlay.visible { display: block; opacity: 1; }

/* =============================================================================
   Thinking Section
   ============================================================================= */
.thinking-section {
    margin-bottom: var(--space-md);
    border-left: 3px solid var(--text-muted);
    background: #f9fafb;
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all var(--transition-slow);
}

.thinking-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    cursor: pointer;
    background: var(--bg-base);
    transition: background var(--transition-normal);
    user-select: none;
}

.thinking-header:hover { background: var(--bg-hover); }
.thinking-icon { font-size: 1rem; }
.thinking-label { font-size: 0.875rem; color: var(--text-secondary); font-weight: 500; }

.expand-icon {
    margin-left: auto;
    font-size: 0.75rem;
    color: var(--text-muted);
    transition: transform var(--transition-normal);
}

.thinking-content {
    padding: var(--space-md);
    font-size: 0.875rem;
    font-style: italic;
    color: var(--text-secondary);
    line-height: 1.6;
    max-height: 1000px;
    overflow: hidden;
    transition: all var(--transition-slow);
    opacity: 1;
}

.thinking-section.collapsed .thinking-content { max-height: 0; padding-top: 0; padding-bottom: 0; opacity: 0; }
.thinking-section.collapsed .expand-icon { transform: rotate(0deg); }
.thinking-section:not(.collapsed) .expand-icon { transform: rotate(90deg); }

/* =============================================================================
   Utilities
   ============================================================================= */
.hidden { display: none !important; }

/* =============================================================================
   Responsive Design
   ============================================================================= */
@media (max-width: 768px) {
    .menu-btn {
        display: flex;
        width: 32px;
        height: 32px;
        padding: var(--space-xs);
    }

    .menu-icon {
        width: 20px;
        height: 2px;
    }

    .menu-icon::before,
    .menu-icon::after {
        height: 2px;
    }

    .sidebar {
        position: fixed;
        left: 0;
        top: var(--header-height);
        bottom: var(--status-bar-height);
        transform: translateX(-100%);
        box-shadow: var(--shadow-lg);
    }

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

    .sidebar-close-btn {
        display: flex; /* Show on mobile */
        width: 40px;
        height: 80px;
    }

    .sidebar-close-btn:hover {
        width: 44px;
    }

    .sidebar-close-icon {
        font-size: 1.5rem;
    }

    .chat-container { width: 100%; }
    .header-left { flex: 0; }
    .logo { font-size: 1rem; }
    .model-select { min-width: 150px; font-size: 0.75rem; }
    .message { max-width: 85%; }

    .btn-tts, .btn-record, .btn-circle, .btn-primary {
        width: var(--button-size-md);
        height: var(--button-size-md);
        padding: 10px;
    }

    .btn-tts { margin-right: 0; }
    .btn-tts .tts-icon { width: 28px; height: 28px; }
    .btn-primary { font-size: 0.75rem; padding: 10px 12px; }

    .input-area { padding: var(--space-md); gap: var(--space-md); }
    .message-input { height: var(--button-size-md); font-size: 16px; }

    /* Always show conversation menu button on mobile (no hover on touch) */
    .conversation-menu-btn { opacity: 1; }

    /* Artifact Panel - Mobile */
    .artifact-panel {
        position: fixed;
        right: 0;
        top: var(--header-height);
        bottom: var(--status-bar-height);
        width: 100%;
        max-width: 400px;
        z-index: 150;
        box-shadow: var(--shadow-lg);
    }

    .artifact-panel.collapsed {
        transform: translateX(100%);
    }

    .artifact-toggle {
        /* Slightly larger on mobile for easier tapping */
        width: 40px;
        height: 80px;
    }

    .artifact-toggle:hover {
        width: 44px;
    }

    .artifact-toggle-icon {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .header { padding: 0 var(--space-sm); }
    .model-select { min-width: 120px; }
    .btn { padding: 0.375rem var(--space-md); font-size: 0.75rem; }
    .input-area { padding: var(--space-md); gap: var(--space-sm); }

    .btn-tts, .btn-record, .btn-circle, .btn-primary {
        width: var(--button-size-sm);
        height: var(--button-size-sm);
        padding: 8px;
    }

    .btn-primary { font-size: 0.7rem; padding: 8px 10px; }
    .logo { font-size: 0.875rem; }
    .message-input { height: var(--button-size-sm); padding: var(--space-sm); }
    .chat-messages { padding: var(--space-md); }
    .message { padding: 0.625rem; font-size: 0.875rem; }
    .status-bar { font-size: 0.7rem; padding: var(--space-xs) var(--space-sm); }
}