/* CloudRouter - Modern Chat UI with Full Mobile Support */

:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-tertiary: #1a1a1a;
    --bg-hover: #222222;
    --bg-active: #2a2a2a;
    
    --border-color: #2a2a2a;
    --border-light: #333333;
    
    --text-primary: #ffffff;
    --text-secondary: #888888;
    --text-muted: #555555;
    
    --accent-primary: #7c5cff;
    --accent-hover: #9b7fff;
    --accent-dim: rgba(124, 92, 255, 0.1);
    
    --user-bubble: #1e1e2e;
    --assistant-bubble: #0d1117;
    --reasoning-bg: #1a1625;
    --reasoning-border: #3d2d5c;
    
    --success: #22c55e;
    --error: #ef4444;
    --danger: #dc2626;
    
    --sidebar-width: 280px;
    --header-height: 56px;
    
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 24px;
    
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    
    --transition-fast: 150ms ease;
    --transition-normal: 200ms ease;
    
    --safe-area-top: env(safe-area-inset-top, 0px);
    --safe-area-bottom: env(safe-area-inset-bottom, 0px);
    --safe-area-left: env(safe-area-inset-left, 0px);
    --safe-area-right: env(safe-area-inset-right, 0px);
}

* { 
    box-sizing: border-box; 
    margin: 0; 
    padding: 0;
    /* Prevent tap highlight on all elements */
    -webkit-tap-highlight-color: transparent;
}

html {
    height: 100%;
    overscroll-behavior: none;
    /* Prevent zoom on double tap */
    touch-action: manipulation;
}

body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    -webkit-user-select: none;
    user-select: none;
    -webkit-text-size-adjust: 100%;
    /* Prevent zoom */
    touch-action: manipulation;
}

/* Allow text selection in messages and inputs */
.message-content,
.reasoning-content,
textarea,
input[type="text"],
input[type="password"],
input[type="number"] {
    -webkit-user-select: text;
    user-select: text;
}

.app-container {
    display: flex;
    height: 100%;
    height: 100dvh;
    overflow: hidden;
}

/* Sidebar Overlay for Mobile */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 199;  /* 99 → 199 に変更 */
    opacity: 0;
    transition: opacity var(--transition-normal);
}

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

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 200;  /* 100 → 200 に変更 */
    transition: transform var(--transition-normal);
}

/* ============ Sidebar Header ============ */
.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    height: 44px; /* brand-barと同じ高さ */
    min-height: 44px;
    flex-shrink: 0;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.sidebar-brand .brand-icon {
    font-size: 1.25rem;
}

.sidebar-brand .brand-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.sidebar-close-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

/* PC版ではサイドバーの閉じるボタンを非表示 */
@media (min-width: 769px) {
    .sidebar-close-btn {
        display: none;
    }
    
    .sidebar-header {
        justify-content: flex-start;
    }
}

.brand-icon {
    font-size: 1.5rem;
}

.brand-name {
    font-size: 1.125rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-primary), #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.sidebar-close-btn {
    display: none;
    width: 36px;
    height: 36px;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
}

.sidebar-close-btn:active { 
    background-color: var(--bg-hover); 
    color: var(--text-primary);
}

.sidebar-close-btn .icon { 
    width: 20px; 
    height: 20px; 
}

.sidebar-new-chat {
    padding: var(--spacing-md);
}

.btn-new-chat {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--accent-primary);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-new-chat:hover, 
.btn-new-chat:active { 
    background-color: var(--accent-hover); 
}

.btn-new-chat .icon { 
    width: 16px; 
    height: 16px; 
}

.chat-history {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-sm);
    -webkit-overflow-scrolling: touch;
}

.chat-history-section { 
    margin-bottom: var(--spacing-md); 
}

.chat-history-label {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.chat-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

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

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

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

.chat-item-title {
    font-size: 0.875rem;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chat-item-actions { 
    display: none; 
    gap: var(--spacing-xs); 
}

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

.chat-item-btn {
    padding: var(--spacing-sm);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
}

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

.chat-item-btn.delete:active { 
    color: var(--error); 
}

.chat-item-btn .icon { 
    width: 16px; 
    height: 16px; 
}

.sidebar-footer {
    padding: var(--spacing-md);
    padding-bottom: calc(var(--spacing-md) + var(--safe-area-bottom));
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.btn-settings {
    width: 100%;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.btn-settings .icon { 
    width: 16px; 
    height: 16px; 
}

.badge {
    margin-left: auto;
    padding: 2px 8px;
    background-color: var(--accent-primary);
    border-radius: var(--radius-full);
    font-size: 0.6875rem;
    color: white;
}

/* Chat Panel */
.chat-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-primary);
    overflow: hidden;
    min-width: 0;
}

/* Header */
.chat-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    padding-top: calc(var(--spacing-md) + var(--safe-area-top));
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    min-height: var(--header-height);
}

.header-menu-btn {
    display: none;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-primary);
    cursor: pointer;
    flex-shrink: 0;
}

.header-menu-btn:active { 
    background-color: var(--bg-hover); 
}

.header-menu-btn .icon { 
    width: 24px; 
    height: 24px; 
}

.header-brand {
    display: none;
    align-items: center;
    gap: var(--spacing-sm);
    flex: 1;
}

.header-brand .brand-icon { 
    font-size: 1.25rem; 
}

.header-brand .brand-name { 
    font-size: 1rem; 
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-primary), #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.header-model {
    display: flex;
    align-items: center;
    margin-left: auto;
}

.header-model-select {
    padding: var(--spacing-sm) var(--spacing-md);
    padding-right: 32px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
    -webkit-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23888888' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    max-width: 220px;
    min-width: 120px;
}

.header-model-select:focus { 
    outline: none; 
    border-color: var(--accent-primary); 
}

.header-model-select option { 
    background-color: var(--bg-secondary); 
}

.chat-log {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    -webkit-overflow-scrolling: touch;
}

.welcome-message {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--text-secondary);
    padding: var(--spacing-xl);
}

.welcome-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
}

.welcome-message h2 {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-primary), #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

/* Messages */
.message-wrapper {
    max-width: 95%;
    width: 100%;
    animation: fadeIn var(--transition-normal);
}

.message-wrapper.user { 
    margin-left: auto; 
}

.message-wrapper.assistant { 
    margin-right: auto; 
}

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

/* Reasoning Block */
.reasoning-block {
    margin-bottom: var(--spacing-sm);
    margin-left: 40px;
    border: 1px solid var(--reasoning-border);
    border-radius: var(--radius-md);
    background-color: var(--reasoning-bg);
    overflow: hidden;
}

.reasoning-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: rgba(124, 92, 255, 0.1);
    cursor: pointer;
    user-select: none;
}

.reasoning-header:active {
    background-color: rgba(124, 92, 255, 0.15);
}

.reasoning-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--accent-primary);
}

.reasoning-title .icon {
    width: 14px;
    height: 14px;
}

.reasoning-chevron {
    width: 14px;
    height: 14px;
    color: var(--text-muted);
    transition: transform var(--transition-fast);
}

.reasoning-block.collapsed .reasoning-chevron {
    transform: rotate(-90deg);
}

.reasoning-content {
    padding: var(--spacing-md);
    font-size: 0.8125rem;
    color: var(--text-secondary);
    line-height: 1.6;
    white-space: pre-wrap;
    max-height: 300px;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.reasoning-block.collapsed .reasoning-content {
    display: none;
}

/* Message */
.message {
    display: flex;
    gap: var(--spacing-sm);
}

.message.user { 
    flex-direction: row-reverse; 
}

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 600;
    flex-shrink: 0;
}

.message.user .message-avatar {
    background: linear-gradient(135deg, #6366f1, #4f46e5);
    color: white;
}

.message.assistant .message-avatar {
    background: linear-gradient(135deg, var(--accent-primary), #6b5ce7);
    color: white;
}

.message-content {
    flex: 1;
    min-width: 0;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    line-height: 1.6;
    font-size: 0.9375rem;
    overflow-wrap: break-word;
    word-wrap: break-word;
    word-break: break-word;
}

.message.user .message-content {
    background-color: var(--user-bubble);
    border-bottom-right-radius: var(--radius-sm);
}

.message.assistant .message-content {
    background-color: var(--assistant-bubble);
    border-bottom-left-radius: var(--radius-sm);
}

/* Message Actions */
.message-actions {
    display: none;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
    margin-left: 40px;
}

.message-wrapper.user .message-actions {
    margin-left: 0;
    margin-right: 40px;
    justify-content: flex-end;
}

.message-wrapper:hover .message-actions,
.message-wrapper.show-actions .message-actions {
    display: flex;
}

.message-action-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.75rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.message-action-btn.delete:hover, 
.message-action-btn.delete:active {
    border-color: var(--error);
    color: var(--error);
}

.message-action-btn .icon {
    width: 12px;
    height: 12px;
}

/* Code blocks */
.code-block-wrapper {
    position: relative;
    margin: 0.75rem 0;
}

.code-block-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: #1d1f21;
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    border: 1px solid var(--border-color);
    border-bottom: none;
}

.code-block-lang {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: lowercase;
}

.code-copy-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.75rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.code-copy-btn.copied { 
    border-color: var(--success); 
    color: var(--success); 
}

.code-copy-btn .icon { 
    width: 12px; 
    height: 12px; 
}

.message-content pre {
    margin: 0 !important;
    padding: var(--spacing-md) !important;
    background-color: #1d1f21 !important;
    border: 1px solid var(--border-color) !important;
    border-top: none !important;
    border-radius: 0 0 var(--radius-md) var(--radius-md) !important;
    overflow-x: auto;
    max-width: 100%;
    -webkit-overflow-scrolling: touch;
}

.message-content pre[class*="language-"] {
    margin: 0 !important;
    background-color: #1d1f21 !important;
}

.message-content code {
    font-family: 'SF Mono', Monaco, 'Cascadia Code', Consolas, monospace;
    font-size: 0.8125rem;
}

.message-content code[class*="language-"],
.message-content pre[class*="language-"] {
    text-shadow: none !important;
}

/* Markdown Styles */
.message-content h1.md-h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 1rem 0 0.75rem 0;
    padding-bottom: 0.3rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

.message-content h2.md-h2 {
    font-size: 1.25rem;
    font-weight: 700;
    margin: 1rem 0 0.75rem 0;
    padding-bottom: 0.3rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

.message-content h3.md-h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin: 0.875rem 0 0.5rem 0;
    color: var(--text-primary);
}

.message-content h4.md-h4 {
    font-size: 1rem;
    font-weight: 600;
    margin: 0.75rem 0 0.5rem 0;
    color: var(--text-primary);
}

.message-content h5.md-h5 {
    font-size: 0.9375rem;
    font-weight: 600;
    margin: 0.625rem 0 0.375rem 0;
    color: var(--text-primary);
}

.message-content h6.md-h6 {
    font-size: 0.875rem;
    font-weight: 600;
    margin: 0.5rem 0 0.375rem 0;
    color: var(--text-secondary);
}

.message-content h1:first-child,
.message-content h2:first-child,
.message-content h3:first-child,
.message-content h4:first-child,
.message-content h5:first-child,
.message-content h6:first-child {
    margin-top: 0;
}

/* Lists */
.message-content .md-list {
    margin: 0.5rem 0;
    padding-left: 1.5rem;
}

.message-content ul.md-list {
    list-style-type: disc;
}

.message-content ol.md-list {
    list-style-type: decimal;
}

.message-content .md-list li {
    margin: 0.25rem 0;
    line-height: 1.6;
}

.message-content .md-list li::marker {
    color: var(--text-muted);
}

/* Tables */
.message-content .md-table-wrapper {
    overflow-x: auto;
    margin: 0.75rem 0;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    -webkit-overflow-scrolling: touch;
}

.message-content .md-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
    min-width: 300px;
}

.message-content .md-table th,
.message-content .md-table td {
    padding: 0.5rem 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.message-content .md-table th {
    background-color: var(--bg-tertiary);
    font-weight: 600;
    color: var(--text-primary);
}

.message-content .md-table td {
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
}

.message-content .md-table tr:last-child td {
    border-bottom: none;
}

/* Blockquote */
.message-content .md-blockquote {
    margin: 0.75rem 0;
    padding: 0.5rem 1rem;
    border-left: 4px solid var(--accent-primary);
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* Horizontal Rule */
.message-content .md-hr {
    margin: 1rem 0;
    border: none;
    border-top: 1px solid var(--border-color);
}

/* Spacer */
.message-content .md-spacer {
    height: 0.5rem;
}

/* Inline Code */
.message-content .inline-code {
    background-color: var(--bg-tertiary);
    padding: 0.125rem 0.375rem;
    border-radius: var(--radius-sm);
    font-family: 'SF Mono', Monaco, 'Cascadia Code', Consolas, monospace;
    font-size: 0.8125rem;
    color: #e06c75;
}

/* Links */
.message-content a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.message-content a:hover, 
.message-content a:active {
    color: var(--accent-hover);
    text-decoration: underline;
}

/* Bold & Italic */
.message-content strong {
    font-weight: 600;
    color: var(--text-primary);
}

.message-content em {
    font-style: italic;
}

.message-content del {
    text-decoration: line-through;
    color: var(--text-muted);
}

/* Paragraph spacing */
.message-content p {
    margin: 0.375rem 0;
}

.message-content p:first-child {
    margin-top: 0;
}

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

/* Input Area */
.input-area {
    padding: var(--spacing-md) var(--spacing-lg);
    padding-bottom: calc(var(--spacing-md) + var(--safe-area-bottom));
    background-color: var(--bg-primary);
    border-top: 1px solid var(--border-color);
}

.input-wrapper { 
    max-width: 800px; 
    margin: 0 auto; 
}

/* Stats Bar */
.stats-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm) var(--spacing-lg);
    padding: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    color: var(--text-muted);
    opacity: 0;
    transform: translateY(10px);
    transition: all var(--transition-normal);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.stats-bar.visible { 
    opacity: 1; 
    transform: translateY(0); 
}

.stats-bar.generating {
    background-color: var(--accent-dim);
    border: 1px solid var(--accent-primary);
}

.stat-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.stat-item .icon { 
    width: 14px; 
    height: 14px; 
}

.stat-item span { 
    font-variant-numeric: tabular-nums; 
}

.stats-bar.generating .stat-item { 
    color: var(--accent-primary); 
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.stats-bar.generating .stat-item.speed { 
    animation: pulse 1s infinite; 
}

.system-prompt-container {
    margin-bottom: var(--spacing-md);
    overflow: hidden;
    max-height: 0;
    transition: max-height var(--transition-normal);
}

.system-prompt-container.open { 
    max-height: 200px; 
}

.system-prompt-content { 
    padding-bottom: var(--spacing-md); 
}

.system-prompt-input {
    width: 100%;
    padding: var(--spacing-md);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 16px;
    font-family: inherit;
    resize: none;
}

.system-prompt-input:focus { 
    outline: none; 
    border-color: var(--accent-primary); 
}

.system-prompt-input::placeholder { 
    color: var(--text-muted); 
}

.input-container {
    display: flex;
    align-items: flex-end;
    gap: var(--spacing-sm);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-sm);
    transition: border-color var(--transition-fast);
}

.input-container:focus-within { 
    border-color: var(--accent-primary); 
}

.btn-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.btn-icon:hover, 
.btn-icon:active { 
    background-color: var(--bg-hover); 
    color: var(--text-primary); 
}

.btn-icon.active { 
    color: var(--accent-primary); 
}

.btn-icon .icon { 
    width: 20px; 
    height: 20px; 
}

.message-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 16px;
    font-family: inherit;
    resize: none;
    max-height: 120px;
    padding: var(--spacing-sm);
    line-height: 1.5;
}

.message-input:focus { 
    outline: none; 
}

.message-input::placeholder { 
    color: var(--text-muted); 
}

.btn-send {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--accent-primary);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

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

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

.btn-send .icon { 
    width: 18px; 
    height: 18px; 
}

/* Settings Row */
.settings-row {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm) var(--spacing-lg);
    margin-top: var(--spacing-md);
    padding: 0 var(--spacing-sm);
}

.setting-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.setting-item label { 
    font-size: 0.75rem; 
    color: var(--text-muted); 
}

.setting-select {
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.875rem;
    cursor: pointer;
    -webkit-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23888888' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 8px center;
    padding-right: 28px;
}

.setting-select:hover, 
.setting-select:focus { 
    border-color: var(--border-light); 
    color: var(--text-primary); 
    outline: none; 
}

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

.btn-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-toggle:hover, 
.btn-toggle:active { 
    border-color: var(--border-light); 
    color: var(--text-primary); 
}

.btn-toggle.active {
    background-color: var(--accent-dim);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

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

/* Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.7);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: var(--spacing-md);
    padding-top: calc(var(--spacing-md) + var(--safe-area-top));
    padding-bottom: calc(var(--spacing-md) + var(--safe-area-bottom));
}

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

.modal {
    width: 100%;
    max-width: 420px;
    max-height: 100%;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.modal.modal-sm { 
    max-width: 320px; 
}

.modal.modal-md { 
    max-width: 480px; 
}

.modal.modal-lg { 
    max-width: 600px; 
}

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

.modal-header h3 { 
    font-size: 1rem; 
    font-weight: 600; 
}

.btn-close {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
}

.btn-close:hover, 
.btn-close:active { 
    background-color: var(--bg-hover); 
    color: var(--text-primary); 
}

/* Modal Tabs */
.modal-tabs {
    display: flex;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-lg) 0;
    border-bottom: 1px solid var(--border-color);
}

.modal-tab {
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-secondary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-bottom: -1px;
}

.modal-tab:hover, 
.modal-tab:active { 
    color: var(--text-primary); 
}

.modal-tab.active {
    color: var(--accent-primary);
    border-bottom-color: var(--accent-primary);
}

.modal-tab-content {
    display: none;
    padding: var(--spacing-lg);
}

.modal-tab-content.active { 
    display: block; 
}

.modal-body {
    overflow-y: auto;
    flex: 1;
    -webkit-overflow-scrolling: touch;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    flex-shrink: 0;
}

.form-group { 
    margin-bottom: var(--spacing-lg); 
}

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

.form-group label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.param-value {
    font-weight: 600;
    color: var(--accent-primary);
}

.form-input {
    width: 100%;
    padding: var(--spacing-md);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 16px;
}

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

.form-textarea {
    font-family: inherit;
    resize: vertical;
    min-height: 100px;
}

.form-range {
    width: 100%;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    outline: none;
    cursor: pointer;
    -webkit-appearance: none;
}

.form-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    background: var(--accent-primary);
    border-radius: var(--radius-full);
    cursor: pointer;
}

.form-range::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--accent-primary);
    border-radius: var(--radius-full);
    cursor: pointer;
    border: none;
}

.form-hint {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: 0.75rem;
    color: var(--text-muted);
}

.input-with-toggle { 
    display: flex; 
    gap: var(--spacing-xs); 
}

.input-with-toggle .form-input { 
    flex: 1; 
}

.btn-icon-sm {
    width: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    flex-shrink: 0;
}

.btn-icon-sm:hover, 
.btn-icon-sm:active { 
    background-color: var(--bg-hover); 
    color: var(--text-primary); 
}

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

/* RAG Modal */
.rag-add-section {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.rag-list-section {
    padding: var(--spacing-lg);
}

.rag-list-section h4 {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.rag-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    max-height: 200px;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.rag-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.rag-item-title {
    font-size: 0.875rem;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 1;
    min-width: 0;
}

.rag-item-delete {
    padding: var(--spacing-sm);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    flex-shrink: 0;
}

.rag-item-delete:hover, 
.rag-item-delete:active { 
    color: var(--error); 
}

/* Buttons */
.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

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

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

.btn-secondary:hover, 
.btn-secondary:active { 
    background-color: var(--bg-hover); 
}

.btn-danger { 
    background-color: var(--danger); 
    color: white; 
}

.btn-danger:hover, 
.btn-danger:active { 
    background-color: var(--error); 
}

/* Error & Toast */
.error-message {
    max-width: 95%;
    margin: 0 auto;
    padding: var(--spacing-md);
    background-color: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--error);
    border-radius: var(--radius-md);
    color: var(--error);
    font-size: 0.875rem;
}

.toast {
    position: fixed;
    bottom: calc(var(--spacing-xl) + var(--safe-area-bottom));
    left: 50%;
    transform: translateX(-50%);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    z-index: 1001;
    animation: toastIn var(--transition-normal);
}

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

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

@keyframes toastIn {
    from { 
        opacity: 0; 
        transform: translateX(-50%) translateY(20px); 
    }
    to { 
        opacity: 1; 
        transform: translateX(-50%) translateY(0); 
    }
}

.empty-state {
    padding: var(--spacing-xl);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Scrollbar */
::-webkit-scrollbar { 
    width: 6px; 
    height: 6px;
}

::-webkit-scrollbar-track { 
    background: transparent; 
}

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

::-webkit-scrollbar-thumb:hover { 
    background-color: var(--border-light); 
}

/* ==================== */
/* RESPONSIVE - MOBILE  */
/* ==================== */
@media (max-width: 768px) {
    /* Sidebar mobile */
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        height: 100%;
        transform: translateX(-100%);
        box-shadow: 2px 0 10px rgba(0, 0, 0, 0.3);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .sidebar-close-btn {
        display: flex;
    }
    
    /* Header mobile */
    .header-menu-btn {
        display: flex;
    }
    
    .header-brand {
        display: flex;
    }
    
    .header-title {
        display: none;
    }
    
    .header-model {
        flex: 0;
    }
    
    .header-model-select {
        max-width: 140px;
        font-size: 0.8125rem;
        padding: var(--spacing-sm);
        padding-right: 28px;
    }
    
    /* Chat log padding */
    .chat-log {
        padding: var(--spacing-md);
    }
    
    /* Message adjustments */
    .message-wrapper {
        max-width: 100%;
    }
    
    .reasoning-block {
        margin-left: 0;
    }
    
    .message-actions {
        margin-left: 0;
        margin-right: 0;
    }
    
    .message-wrapper.user .message-actions {
        margin-right: 0;
    }
    
    /* Input area mobile */
    .input-area {
        padding: var(--spacing-sm) var(--spacing-md);
        padding-bottom: calc(var(--spacing-sm) + var(--safe-area-bottom));
    }
    
    .settings-row {
        gap: var(--spacing-sm);
        padding: 0;
    }
    
    .setting-item label {
        display: none;
    }
    
    /* Stats bar mobile */
    .stats-bar {
        gap: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.6875rem;
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .stat-item .icon {
        width: 12px;
        height: 12px;
    }
    
    /* Welcome message mobile */
    .welcome-icon {
        font-size: 3rem;
    }
    
    .welcome-message h2 {
        font-size: 1.25rem;
    }
    
    /* Modal mobile */
    .modal {
        max-height: 90%;
        margin: var(--spacing-md);
    }
    
    .modal.modal-lg {
        max-width: 100%;
    }
}

/* Small phones */
@media (max-width: 375px) {
    .header-model-select {
        max-width: 100px;
        font-size: 0.75rem;
    }
    
    .btn-toggle span {
        display: none;
    }
    
    .setting-select {
        font-size: 0.75rem;
        padding: var(--spacing-xs) var(--spacing-sm);
        padding-right: 24px;
    }
}
/* Reasoning Toggle Modes */
.btn-toggle.reasoning-off {
    color: var(--text-muted);
}

.btn-toggle.reasoning-auto.active {
    background-color: var(--accent-dim);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.btn-toggle.reasoning-max.active {
    background-color: rgba(34, 197, 94, 0.1);
    border-color: var(--success);
    color: var(--success);
}

/* Attached Files */
.attached-files {
    display: none;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    padding: var(--spacing-sm);
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.attached-file {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
}

.attached-file-name {
    max-width: 150px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--text-secondary);
}

.attached-file-remove {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    cursor: pointer;
}

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

.attached-file-remove .icon {
    width: 12px;
    height: 12px;
}

/* Mobile adjustments for new buttons */
@media (max-width: 768px) {
    .settings-row {
        justify-content: flex-start;
    }
    
    .btn-toggle span {
        display: none;
    }
    
    .btn-toggle {
        padding: var(--spacing-sm);
    }
}

@media (max-width: 375px) {
    .settings-row {
        gap: var(--spacing-xs);
    }
}
/* Reasoning Mode Styles */
.btn-toggle.reasoning-max {
    background-color: rgba(34, 197, 94, 0.15);
    border-color: var(--success);
    color: var(--success);
}

.btn-toggle.reasoning-max:hover {
    background-color: rgba(34, 197, 94, 0.25);
}

/* ============ Mobile Layout & Scroll Hide ============ */
@media (max-width: 768px) {
    /* チャットパネル */
    .chat-panel {
        position: relative;
        height: 100vh;
        height: 100dvh;
        overflow: hidden;
    }
    
    /* ヘッダー固定 */
    .chat-header {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 100;
        background: var(--bg-secondary);
        transition: transform 0.3s ease, opacity 0.3s ease;
        will-change: transform, opacity;
    }
    
    /* 入力エリア固定 */
    .input-area {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        z-index: 100;
        background: var(--bg-primary);
        transition: transform 0.3s ease, opacity 0.3s ease;
        will-change: transform, opacity;
    }
    
    /* チャットログ - スクロール領域 */
    .chat-log {
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        overflow-y: auto;
        overflow-x: hidden;
        -webkit-overflow-scrolling: touch;
        padding-top: 70px;
        padding-bottom: 160px;
        padding-left: var(--spacing-sm);
        padding-right: var(--spacing-sm);
    }
    
    /* AIメッセージ - アイコン非表示、全幅 */
    .message.assistant {
        flex-direction: column;
        align-items: stretch;
        padding: 0;
    }
    
    .message.assistant .message-avatar {
        display: none;
    }
    
    .message.assistant .message-content {
        max-width: 100%;
        width: 100%;
        margin-left: 0;
    }
    
    /* ユーザーメッセージ */
    .message.user {
        padding: 0;
    }
    
    .message.user .message-avatar {
        width: 28px;
        height: 28px;
        font-size: 0.7rem;
        flex-shrink: 0;
    }
    
    .message.user .message-content {
        max-width: calc(100% - 40px);
    }
    
    /* メッセージラッパー全幅 */
    .message-wrapper {
        max-width: 100%;
        width: 100%;
    }
    
    /* Reasoningも全幅 */
    .reasoning-block {
        width: 100%;
        margin-left: 0;
    }
    
    /* Welcome */
    .welcome-message {
        padding-top: 70px;
    }
    
    /* メッセージアクション非表示 */
    .message-actions {
        display: none !important;
    }
}

/* ============ PC Message Actions (hover) ============ */
@media (min-width: 769px) {
    .message {
        position: relative;
    }
    
    .message-actions {
        position: absolute;
        top: 50%;
        transform: translateY(-50%);
        display: flex;
        gap: 4px;
        opacity: 0;
        visibility: hidden;
        transition: opacity var(--transition-fast), visibility var(--transition-fast);
        background: var(--bg-primary);
        border: 1px solid var(--border-color);
        border-radius: var(--radius-md);
        padding: 4px;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
        z-index: 10;
    }
    
    .message.user .message-actions {
        right: 100%;
        margin-right: 8px;
    }
    
    .message.assistant .message-actions {
        left: 100%;
        margin-left: 8px;
    }
    
    .message-wrapper:hover .message-actions {
        opacity: 1;
        visibility: visible;
    }
    
    .msg-action-btn {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 32px;
        height: 32px;
        padding: 0;
        background: transparent;
        border: none;
        border-radius: var(--radius-sm);
        color: var(--text-muted);
        cursor: pointer;
        transition: all var(--transition-fast);
    }
    
    .msg-action-btn:hover {
        background: var(--bg-hover);
        color: var(--text-primary);
    }
    
    .msg-action-btn svg {
        width: 16px;
        height: 16px;
    }
    
    .msg-action-btn.delete-msg-btn:hover {
        background: rgba(239, 68, 68, 0.1);
        color: var(--error);
    }
    
    .msg-action-btn.regenerate-btn:hover,
    .msg-action-btn.resend-btn:hover {
        background: rgba(59, 130, 246, 0.1);
        color: var(--accent-primary);
    }
    
    .message.user {
        padding-left: 110px;
    }
    
    .message.assistant {
        padding-right: 110px;
    }
}

/* ============ Dynamic Island Style Components ============ */

/* Header User Island */
.header-user-island {
    display: flex;
    align-items: center;
    gap: 0;
    background: linear-gradient(135deg, #1a1a1a, #2a2a2a);
    border-radius: var(--radius-full);
    padding: 4px;
    margin-left: auto;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.user-role-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 6px 12px;
    background: linear-gradient(135deg, var(--accent-primary), #6b5ce7);
    border-radius: var(--radius-full);
    font-size: 0.625rem;
    font-weight: 700;
    color: white;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.user-avatar {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, #6366f1, #4f46e5);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
    margin-left: 4px;
}

/* Stats Island */
.stats-island {
    display: flex;
    align-items: center;
    margin-left: auto;
    background: linear-gradient(135deg, #1a1a1a, #2a2a2a);
    border-radius: var(--radius-full);
    padding: 4px 6px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.05);
    opacity: 0.6;
    transition: all var(--transition-normal);
    min-width: 120px;
}

.stats-island:hover {
    opacity: 1;
}

.stats-island.active {
    opacity: 1;
    border-color: var(--accent-primary);
    box-shadow: 0 2px 12px rgba(124, 92, 255, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.stats-island-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 4px 8px;
    width: 100%;
    justify-content: center;
}

.stats-speed {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent-primary);
    font-variant-numeric: tabular-nums;
}

.stats-tokens {
    font-size: 0.6875rem;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}

.stats-island.generating .stats-speed {
    animation: pulse 1s infinite;
}

/* Header layout adjustments */
.chat-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    padding-top: calc(var(--spacing-md) + var(--safe-area-top));
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    min-height: var(--header-height);
}

.header-model {
    display: flex;
    align-items: center;
    margin-left: 0;
    margin-right: auto;
}

.header-title {
    display: none;
}

/* ============ Mobile Adjustments for Islands ============ */
@media (max-width: 768px) {
    /* Header User Island - モバイル */
    .header-user-island {
        padding: 3px;
    }
    
    .user-role-badge {
        padding: 4px 8px;
        font-size: 0.5625rem;
    }
    
    .user-avatar {
        width: 28px;
        height: 28px;
        font-size: 0.6875rem;
    }
    
    /* Stats Island - モバイル */
    .stats-island {
        min-width: 100px;
        padding: 3px 4px;
    }
    
    .stats-island-content {
        gap: var(--spacing-xs);
        padding: 3px 6px;
    }
    
    .stats-speed {
        font-size: 0.6875rem;
    }
    
    .stats-tokens {
        font-size: 0.625rem;
    }
    
    /* Settings row - モバイル */
    .settings-row {
        flex-wrap: wrap;
        gap: var(--spacing-xs);
    }
}

@media (max-width: 375px) {
    .header-user-island {
        padding: 2px;
    }
    
    .user-role-badge {
        padding: 3px 6px;
        font-size: 0.5rem;
    }
    
    .user-avatar {
        width: 24px;
        height: 24px;
        font-size: 0.625rem;
    }
    
    .stats-island {
        min-width: 90px;
    }
    
    .stats-speed {
        font-size: 0.625rem;
    }
    
    .stats-tokens {
        display: none;
    }
}
/* ============ Brand Bar (PC Only) ============ */
.brand-bar {
    display: none; /* モバイルでは非表示 */
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    height: 44px;
}

.brand-bar-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.brand-bar-left .brand-icon {
    font-size: 1.25rem;
}

.brand-bar-left .brand-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.brand-bar-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.brand-bar-link {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.brand-bar-link:hover {
    color: var(--text-primary);
}

/* ============ Toolbar (PC Only) ============ */
.toolbar {
    display: none; /* モバイルでは非表示 */
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    height: 52px;
    gap: var(--spacing-md);
}

.toolbar-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.toolbar-center {
    display: flex;
    align-items: center;
    flex: 1;
    justify-content: center;
    max-width: 300px;
}

.toolbar-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

/* Toolbar Buttons */
.toolbar-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    height: 36px;
}

.toolbar-btn:hover {
    background-color: var(--bg-hover);
    border-color: var(--border-hover);
}

.toolbar-btn .icon {
    width: 18px;
    height: 18px;
}

.toolbar-btn .btn-text {
    white-space: nowrap;
}

.sidebar-toggle-btn {
    padding: var(--spacing-sm);
}

/* Model Select in Toolbar */
.model-select-wrapper {
    position: relative;
    width: 100%;
}

.toolbar-model-select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-xl) var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    appearance: none;
    height: 36px;
    transition: all var(--transition-fast);
}

.toolbar-model-select:hover {
    background-color: var(--bg-hover);
    border-color: var(--border-hover);
}

.toolbar-model-select:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.model-select-wrapper .select-chevron {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    color: var(--text-muted);
    pointer-events: none;
}

/* User Island in Toolbar */
.user-island {
    display: flex;
    align-items: center;
    gap: 0;
    background: linear-gradient(135deg, #1a1a1a, #2a2a2a);
    border-radius: var(--radius-full);
    padding: 4px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.05);
    height: 36px;
}

.user-island .user-role-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4px 10px;
    background: linear-gradient(135deg, var(--accent-primary), #6b5ce7);
    border-radius: var(--radius-full);
    font-size: 0.625rem;
    font-weight: 700;
    color: white;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    height: 28px;
}

.user-island .user-avatar {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: linear-gradient(135deg, #6366f1, #4f46e5);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
    margin-left: 4px;
}

/* ============ Mobile Header ============ */
.chat-header.mobile-only {
    display: flex; /* モバイルでは表示 */
}

/* ============ PC Layout ============ */
@media (min-width: 769px) {
    /* Show brand bar and toolbar on PC */
    .brand-bar {
        display: flex;
    }
    
    .toolbar {
        display: flex;
    }
    
    /* Hide mobile header on PC */
    .chat-header.mobile-only {
        display: none;
    }
    
    /* Adjust chat-log top position */
    .chat-log {
        /* brand-bar(44px) + toolbar(52px) = 96px */
    }
    
    /* Sidebar behavior on PC */
    .sidebar {
        transform: translateX(0);
    }
    
    .sidebar.collapsed {
        transform: translateX(-100%);
        width: 0;
        min-width: 0;
        overflow: hidden;
    }
    
    .sidebar.collapsed + .chat-panel {
        margin-left: 0;
    }
}

/* ============ Mobile Layout (Default) ============ */
@media (max-width: 768px) {
    .brand-bar {
        display: none;
    }
    
    .toolbar {
        display: none;
    }
    
    .chat-header.mobile-only {
        display: flex;
        align-items: center;
        gap: var(--spacing-md);
        padding: var(--spacing-md) var(--spacing-lg);
        padding-top: calc(var(--spacing-md) + var(--safe-area-top));
        background-color: var(--bg-secondary);
        border-bottom: 1px solid var(--border-color);
        min-height: var(--header-height);
        position: sticky;
        top: 0;
        z-index: 100;
        transition: transform var(--transition-normal), opacity var(--transition-normal);
    }
    
    /* Mobile header model select */
    .header-model {
        margin-left: 0;
        margin-right: auto;
    }
    
    .header-model-select {
        padding: var(--spacing-xs) var(--spacing-sm);
        background-color: var(--bg-tertiary);
        border: 1px solid var(--border-color);
        border-radius: var(--radius-sm);
        color: var(--text-primary);
        font-size: 0.75rem;
    }
    
    /* Mobile user island */
    .header-user-island {
        display: flex;
        align-items: center;
        gap: 0;
        background: linear-gradient(135deg, #1a1a1a, #2a2a2a);
        border-radius: var(--radius-full);
        padding: 3px;
        border: 1px solid var(--border-color);
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.05);
    }
    
    .header-user-island .user-role-badge {
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 4px 8px;
        background: linear-gradient(135deg, var(--accent-primary), #6b5ce7);
        border-radius: var(--radius-full);
        font-size: 0.5625rem;
        font-weight: 700;
        color: white;
        letter-spacing: 0.5px;
        text-transform: uppercase;
    }
    
    .header-user-island .user-avatar {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 26px;
        height: 26px;
        background: linear-gradient(135deg, #6366f1, #4f46e5);
        border-radius: var(--radius-full);
        font-size: 0.6875rem;
        font-weight: 600;
        color: white;
        margin-left: 3px;
    }
}

/* ============ Stats Island (Bottom) ============ */
.stats-island {
    display: flex;
    align-items: center;
    margin-left: auto;
    background: linear-gradient(135deg, #1a1a1a, #2a2a2a);
    border-radius: var(--radius-full);
    padding: 4px 6px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.05);
    opacity: 0.6;
    transition: all var(--transition-normal);
    min-width: 130px;
}

.stats-island:hover {
    opacity: 1;
}

.stats-island.active {
    opacity: 1;
    border-color: var(--accent-primary);
    box-shadow: 0 2px 12px rgba(124, 92, 255, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.stats-island-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 4px 8px;
    width: 100%;
    justify-content: center;
}

.stats-speed {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent-primary);
    font-variant-numeric: tabular-nums;
}

.stats-tokens {
    font-size: 0.6875rem;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}

.stats-island.generating .stats-speed {
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}
/* ============ PC版: サイドバー開閉時のNew Chatボタン表示制御 ============ */
@media (min-width: 769px) {
    /* サイドバーが開いている時（デフォルト）はツールバーのNew Chatを非表示 */
    .sidebar:not(.collapsed) ~ .chat-panel .toolbar .new-chat-btn {
        display: none;
    }
    
    /* サイドバーが閉じている時はツールバーのNew Chatを表示 */
    .sidebar.collapsed ~ .chat-panel .toolbar .new-chat-btn {
        display: flex;
    }
}