/* ============================================
   PDF Analysis - Dark CRM Dashboard Aesthetic
   ============================================ */

:root {
    /* Colors - Dark Theme Default */
    --bg-primary: #0a0a0a;
    --bg-secondary: #141414;
    --bg-tertiary: #1f1f1f;
    --bg-card: #1a1a1a;
    --bg-card-hover: #252525;

    --text-primary: #ffffff;
    --text-secondary: #a3a3a3;
    --text-muted: #666666;

    --accent: #f97316;
    --accent-hover: #ea580c;
    --accent-soft: #2a1f1a;

    --success: #22c55e;
    --warning: #f59e0b;
    --error: #ef4444;

    --border: #2a2a2a;
    --border-hover: #404040;

    /* Typography */
    --font-sans: 'Inter', 'Noto Sans Georgian', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: ui-monospace, 'SF Mono', SFMono-Regular, Menlo, monospace;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;

    /* Layout */
    --header-height: 60px;
    --sidebar-width: 280px;
}

/* Light Mode */
html.light-mode {
    --bg-primary: #ffffff;
    --bg-secondary: #fafafa;
    --bg-tertiary: #f5f5f5;
    --bg-card: #ffffff;
    --bg-card-hover: #f9f9f9;

    --text-primary: #171717;
    --text-secondary: #525252;
    --text-muted: #a3a3a3;

    --accent: #f97316;
    --accent-hover: #ea580c;
    --accent-soft: #fff7ed;

    --border: #e5e5e5;
    --border-hover: #d4d4d4;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.06);
}

html.light-mode ::-webkit-scrollbar-thumb {
    background: #d4d4d4;
}

html.light-mode ::-webkit-scrollbar-thumb:hover {
    background: #a3a3a3;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    overflow: hidden;
}

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

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

::-webkit-scrollbar-thumb {
    background: #d4d4d4;
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: #a3a3a3;
}

/* ============================================
   App Layout
   ============================================ */

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
    overflow: hidden;
}

/* Header */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    padding: 0 var(--spacing-xl);
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    cursor: pointer;
}

.logo-img {
    height: 36px;
    width: auto;
}

.logo-img.logo-light {
    display: none;
}

html.light-mode .logo-img.logo-dark {
    display: none;
}

html.light-mode .logo-img.logo-light {
    display: block;
}

.header-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
}

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

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.btn-deploy {
    position: relative;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--accent);
    color: var(--bg-primary);
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    min-width: 100px;
    overflow: hidden;
}

.btn-deploy:hover:not(.loading) {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.btn-deploy:active:not(.loading) {
    transform: translateY(0);
}

.btn-deploy.loading {
    cursor: wait;
    background: linear-gradient(90deg, var(--accent) 0%, #333 50%, var(--accent) 100%);
    background-size: 200% 100%;
    animation: deployShimmer 1.5s ease-in-out infinite;
}

@keyframes deployShimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.btn-deploy.success {
    background: var(--success);
}

.deploy-text {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.deploy-dots {
    display: none;
}

.btn-deploy.loading .deploy-dots {
    display: inline-flex;
    gap: 2px;
}

.deploy-dots span {
    width: 3px;
    height: 3px;
    background: currentColor;
    border-radius: 50%;
    animation: deployDots 1.4s ease-in-out infinite;
}

.deploy-dots span:nth-child(2) {
    animation-delay: 0.2s;
}

.deploy-dots span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes deployDots {
    0%, 80%, 100% { opacity: 0.3; transform: scale(0.8); }
    40% { opacity: 1; transform: scale(1); }
}

/* Main Content - Two Panel Layout */
.app-main {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* ============================================
   Sidebar (Left Panel - Threads)
   ============================================ */

.sidebar {
    display: flex;
    flex-direction: column;
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    overflow-y: auto;
}

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

.sidebar-header h2 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 0.05em;
}

.thread-count {
    background: var(--bg-tertiary);
    color: var(--text-muted);
    font-size: 0.75rem;
    font-weight: 500;
    padding: 0.125rem 0.5rem;
    border-radius: 10px;
}

.btn-new-thread {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--accent);
    color: var(--bg-primary);
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
}

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

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

.thread-list,
.user-list {
    flex: 1;
    overflow-y: auto;
    padding: 0 var(--spacing-sm);
    min-height: 0;
}

.thread-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    color: inherit;
    border-bottom: 1px solid var(--border);
}

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

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

.thread-item.active {
    background: var(--bg-primary);
    box-shadow: var(--shadow-sm);
}

.thread-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.thread-item.active .thread-icon {
    background: var(--accent);
}

.thread-item.active .thread-icon svg {
    color: var(--bg-primary);
}

.thread-icon svg {
    width: 16px;
    height: 16px;
    color: var(--text-muted);
}

.thread-info {
    flex: 1;
    min-width: 0;
}

.thread-title {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.thread-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 2px;
}

.thread-delete {
    display: none;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: none;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.thread-item:hover .thread-delete {
    display: flex;
}

.thread-delete:hover {
    background: var(--error);
    color: white;
}

.thread-delete svg {
    width: 14px;
    height: 14px;
}

/* ============================================
   Chat Panel (Right Panel)
   ============================================ */

.panel {
    display: flex;
    flex-direction: column;
    background: var(--bg-primary);
    overflow: hidden;
}

.panel-chat {
    flex: 1;
    position: relative;
}

/* Document Bar */
.document-bar {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    min-height: 52px;
}

.document-selector {
    position: relative;
}

.document-selector-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    min-width: 200px;
    max-width: 280px;
}

.document-selector-btn:hover {
    border-color: var(--border-hover);
    background: var(--bg-card-hover);
}

.document-selector.open .document-selector-btn {
    border-color: var(--accent);
}

.doc-icon {
    width: 16px;
    height: 16px;
    color: var(--text-muted);
    flex-shrink: 0;
}

.doc-name {
    flex: 1;
    font-size: 0.8125rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    text-align: left;
}

.document-selector-btn.has-doc .doc-name {
    color: var(--text-primary);
    font-weight: 500;
}

.doc-chevron {
    width: 14px;
    height: 14px;
    color: var(--text-muted);
    flex-shrink: 0;
    transition: transform var(--transition-fast);
}

.document-selector.open .doc-chevron {
    transform: rotate(180deg);
}

/* Document Dropdown */
.document-dropdown {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    width: 280px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all var(--transition-fast);
}

.document-selector.open .document-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--border);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

.document-count {
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    background: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
}

.dropdown-list {
    max-height: 240px;
    overflow-y: auto;
    padding: var(--spacing-xs);
}

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

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

.dropdown-item.active {
    background: var(--accent-soft);
}

.dropdown-item-icon {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.5rem;
    font-weight: 600;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.dropdown-item-info {
    flex: 1;
    min-width: 0;
}

.dropdown-item-name {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.dropdown-item-meta {
    display: flex;
    gap: var(--spacing-sm);
    font-size: 0.6875rem;
    color: var(--text-muted);
    margin-top: 2px;
}

.dropdown-item-status {
    display: flex;
    align-items: center;
    gap: 4px;
}

.dropdown-item-status::before {
    content: '';
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--text-muted);
}

.dropdown-item-status.ready::before {
    background: var(--success);
}

.dropdown-item-status.processing::before {
    background: var(--warning);
}

.dropdown-item-actions {
    display: flex;
    gap: 2px;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.dropdown-item:hover .dropdown-item-actions {
    opacity: 1;
}

.dropdown-action-btn {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.dropdown-action-btn.delete:hover {
    color: var(--error);
}

.dropdown-action-btn svg {
    width: 14px;
    height: 14px;
}

.dropdown-upload-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    width: calc(100% - var(--spacing-md));
    margin: var(--spacing-sm) auto;
    padding: var(--spacing-sm);
    background: var(--bg-tertiary);
    border: 1px dashed var(--border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.8125rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.dropdown-upload-btn:hover {
    background: var(--bg-secondary);
    border-color: var(--text-muted);
    color: var(--text-primary);
}

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

.dropdown-empty {
    padding: var(--spacing-lg);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8125rem;
}

/* Chat Header Title */
.chat-header-title {
    flex: 1;
    min-width: 0;
}

.chat-title {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.btn-clear {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: none;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.btn-clear:hover {
    border-color: var(--error);
    color: var(--error);
    background: rgba(239, 68, 68, 0.05);
}

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

/* ============================================
   Chat Messages
   ============================================ */

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.message {
    display: flex;
    gap: var(--spacing-md);
    max-width: 75%;
    animation: messageIn 0.2s ease-out;
}

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

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

.message-avatar {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.875rem;
    flex-shrink: 0;
    overflow: hidden;
}

.message-avatar svg {
    width: 18px;
    height: 18px;
}

.message-avatar img {
    width: 20px;
    height: 20px;
    object-fit: contain;
    filter: grayscale(100%);
}

.message-user .message-avatar {
    background: var(--accent);
    color: var(--bg-primary);
}

.message-user .message-avatar svg {
    fill: var(--bg-primary);
}

.message-content {
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    border-top-left-radius: var(--radius-sm);
}

.message-user .message-content {
    background: var(--accent);
    color: var(--bg-primary);
    border-top-left-radius: var(--radius-lg);
    border-top-right-radius: var(--radius-sm);
}

.message-content p {
    font-size: 0.9375rem;
    line-height: 1.6;
}

/* Markdown Styles */
.message-content p:first-child {
    margin-top: 0;
}

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

.message-content p + p {
    margin-top: 0.75em;
}

.message-content h1,
.message-content h2,
.message-content h3 {
    font-weight: 600;
    line-height: 1.3;
    margin-top: 1.25em;
    margin-bottom: 0.5em;
}

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

.message-content h1 {
    font-size: 1.25rem;
}

.message-content h2 {
    font-size: 1.125rem;
}

.message-content h3 {
    font-size: 1rem;
}

.message-content h4,
.message-content h5,
.message-content h6 {
    margin: 1em 0 0.5em;
    font-weight: 600;
    line-height: 1.3;
    font-size: 0.9rem;
}

.message-content img {
    max-width: 100%;
    height: auto;
    border-radius: 6px;
    margin: 0.5em 0;
}

.message-content code {
    font-family: var(--font-mono);
    font-size: 0.85em;
    background: rgba(0, 0, 0, 0.06);
    padding: 0.15em 0.4em;
    border-radius: 4px;
}

.message-user .message-content code {
    background: rgba(255, 255, 255, 0.15);
}

.message-content pre {
    margin: 0.75em 0;
    padding: 0;
    background: transparent;
    overflow: visible;
}

.message-content pre code {
    display: block;
    background: rgba(0, 0, 0, 0.04);
    padding: 0.875em 1em;
    border-radius: var(--radius-md);
    overflow-x: auto;
    font-size: 0.8125rem;
    line-height: 1.5;
    border: 1px solid var(--border);
}

.message-user .message-content pre code {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.15);
}

.message-content ul,
.message-content ol {
    margin: 0.75em 0;
    padding-left: 1.5em;
}

.message-content li {
    margin: 0.25em 0;
    line-height: 1.5;
}

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

.message-content blockquote {
    margin: 0.75em 0;
    padding: 0.5em 1em;
    border-left: 3px solid var(--border);
    background: rgba(0, 0, 0, 0.02);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.message-user .message-content blockquote {
    border-left-color: rgba(255, 255, 255, 0.3);
    background: rgba(255, 255, 255, 0.05);
}

.message-content blockquote p {
    margin: 0;
    color: var(--text-secondary);
    font-style: italic;
}

.message-content strong {
    font-weight: 600;
}

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

.message-content a {
    color: inherit;
    text-decoration: underline;
    text-underline-offset: 2px;
}

.message-content a:hover {
    opacity: 0.8;
}

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

.message-user .message-content hr {
    border-top-color: rgba(255, 255, 255, 0.2);
}

.message-content table {
    width: 100%;
    margin: 0.75em 0;
    border-collapse: collapse;
    font-size: 0.875rem;
}

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

.message-content th {
    background: rgba(0, 0, 0, 0.03);
    font-weight: 600;
}

.message-user .message-content th,
.message-user .message-content td {
    border-color: rgba(255, 255, 255, 0.15);
}

.message-user .message-content th {
    background: rgba(255, 255, 255, 0.1);
}

/* Chat Input */
.chat-input-container {
    padding: var(--spacing-lg) var(--spacing-xl);
    border-top: 1px solid var(--border);
    background: var(--bg-primary);
}

.chat-disclaimer {
    text-align: center;
    font-size: 11px;
    color: #999;
    margin: var(--spacing-xs) 0 0;
    padding: 0;
}

/* ============================================
   Custom Confirm Dialog
   ============================================ */

.confirm-overlay {
    position: fixed;
    inset: 0;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0);
    backdrop-filter: blur(0px);
    transition: background 0.2s ease, backdrop-filter 0.2s ease;
}

.confirm-overlay.visible {
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.confirm-box {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl, 16px);
    padding: 28px 32px 24px;
    min-width: 340px;
    max-width: 420px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    transform: scale(0.95) translateY(8px);
    opacity: 0;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.confirm-overlay.visible .confirm-box {
    transform: scale(1) translateY(0);
    opacity: 1;
}

.confirm-message {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-primary);
    margin: 0 0 24px;
    line-height: 1.5;
    text-align: center;
}

.confirm-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

.confirm-btn-cancel,
.confirm-btn-ok {
    padding: 8px 20px;
    border-radius: var(--radius-md, 8px);
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s ease;
    border: 1px solid var(--border);
    font-family: var(--font-sans);
}

.confirm-btn-cancel {
    background: var(--bg-secondary);
    color: var(--text-secondary);
}

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

.confirm-btn-ok {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

.confirm-btn-ok:hover {
    filter: brightness(1.1);
}

.confirm-btn-ok.danger {
    background: #ef4444;
    border-color: #ef4444;
}

.confirm-btn-ok.danger:hover {
    background: #dc2626;
    border-color: #dc2626;
}

.chat-form {
    display: flex;
    gap: var(--spacing-sm);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xs);
    transition: all var(--transition-base);
}

.chat-form:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.05);
}

.chat-input {
    flex: 1;
    background: none;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    padding: var(--spacing-sm) var(--spacing-md);
}

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

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

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

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

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

/* Typing Indicator */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: var(--spacing-md) var(--spacing-lg);
}

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

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

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

@keyframes typing {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.4;
    }
    30% {
        transform: translateY(-6px);
        opacity: 1;
    }
}

/* ============================================
   Footer
   ============================================ */

.app-footer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--bg-primary);
    border-top: 1px solid var(--border);
    flex-shrink: 0;
}

.powered-by {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.powered-logo {
    height: 24px;
    width: auto;
}

/* ============================================
   Mobile Navigation
   ============================================ */

.mobile-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-top: 1px solid var(--border);
    padding: var(--spacing-sm) var(--spacing-md);
    z-index: 100;
}

.tab-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: var(--spacing-sm);
    background: none;
    border: none;
    color: var(--text-muted);
    font-family: var(--font-sans);
    font-size: 0.6875rem;
    font-weight: 500;
    cursor: pointer;
    transition: color var(--transition-fast);
}

.tab-btn svg {
    width: 20px;
    height: 20px;
}

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

/* ============================================
   Upload Modal
   ============================================ */

.upload-modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.upload-modal.active {
    opacity: 1;
    visibility: visible;
}

.upload-modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.upload-modal-container {
    position: relative;
    width: 100%;
    max-width: 420px;
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg), 0 0 0 1px var(--border);
    transform: scale(0.95) translateY(10px);
    transition: transform var(--transition-base);
}

.upload-modal.active .upload-modal-container {
    transform: scale(1) translateY(0);
}

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

.upload-modal-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.upload-close-btn {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.upload-close-btn:hover {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error);
}

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

/* Upload Zone */
.upload-zone {
    position: relative;
    margin: var(--spacing-lg);
    padding: var(--spacing-2xl) var(--spacing-xl);
    border: 1px dashed var(--border);
    border-radius: var(--radius-lg);
    background: var(--bg-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
    overflow: hidden;
}

.upload-zone:hover {
    border-color: var(--text-muted);
    background: var(--bg-tertiary);
}

.upload-zone.dragover {
    border-color: var(--accent);
    border-style: solid;
    background: var(--bg-tertiary);
}

.upload-zone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    transition: opacity var(--transition-fast);
}

.upload-zone.uploading .upload-zone-content {
    opacity: 0;
}

.upload-icon {
    width: 40px;
    height: 40px;
    color: var(--text-muted);
    transition: color var(--transition-base);
}

.upload-zone:hover .upload-icon {
    color: var(--text-secondary);
}

.upload-text {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-primary);
}

.upload-subtext {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

/* Upload Progress */
.upload-progress {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-fast);
}

.upload-zone.uploading .upload-progress {
    opacity: 1;
}

.progress-bar {
    width: 60%;
    height: 3px;
    background: var(--border);
    border-radius: 2px;
    overflow: hidden;
}

.progress-bar::after {
    content: '';
    display: block;
    height: 100%;
    width: 30%;
    background: var(--accent);
    border-radius: 2px;
    animation: progress-indeterminate 1.5s ease-in-out infinite;
}

@keyframes progress-indeterminate {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(400%); }
}

.progress-text {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Learning Progress */
.learning-progress {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
}

.upload-zone.learning .upload-zone-content {
    opacity: 0;
}

.upload-zone.learning .upload-progress {
    opacity: 0;
}

.upload-zone.learning .learning-progress {
    opacity: 1;
}

.upload-zone.learning {
    overflow: visible;
    min-height: 280px;
}

.learning-visual {
    position: relative;
    width: 120px;
    height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.learning-ring {
    position: absolute;
    border: 2px solid var(--accent);
    border-radius: 50%;
    opacity: 0;
    box-shadow: 0 0 8px rgba(0, 0, 0, 0.15);
}

.ring-1 {
    width: 60px;
    height: 60px;
    animation: ringPulse 2s ease-out infinite;
}

.ring-2 {
    width: 60px;
    height: 60px;
    animation: ringPulse 2s ease-out infinite 0.5s;
}

.ring-3 {
    width: 60px;
    height: 60px;
    animation: ringPulse 2s ease-out infinite 1s;
}

@keyframes ringPulse {
    0% {
        transform: scale(1);
        opacity: 0.8;
        box-shadow: 0 0 12px rgba(0, 0, 0, 0.2);
    }
    100% {
        transform: scale(2.5);
        opacity: 0;
        box-shadow: 0 0 0 rgba(0, 0, 0, 0);
    }
}

.learning-orbit {
    position: absolute;
    width: 110px;
    height: 110px;
    animation: orbitRotate 6s linear infinite;
}

@keyframes orbitRotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.orbit-particle {
    position: absolute;
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
    box-shadow: 0 0 12px rgba(0, 0, 0, 0.4), 0 0 20px rgba(0, 0, 0, 0.2);
}

.orbit-particle.p1 {
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    animation: particlePulse 1.5s ease-in-out infinite;
}

.orbit-particle.p2 {
    bottom: 15%;
    left: 10%;
    animation: particlePulse 1.5s ease-in-out infinite 0.3s;
}

.orbit-particle.p3 {
    bottom: 15%;
    right: 10%;
    animation: particlePulse 1.5s ease-in-out infinite 0.6s;
}

@keyframes particlePulse {
    0%, 100% {
        opacity: 0.6;
        transform: translateX(-50%) scale(0.8);
        box-shadow: 0 0 8px rgba(0, 0, 0, 0.3);
    }
    50% {
        opacity: 1;
        transform: translateX(-50%) scale(1.3);
        box-shadow: 0 0 16px rgba(0, 0, 0, 0.5), 0 0 24px rgba(0, 0, 0, 0.2);
    }
}

.learning-icon {
    position: relative;
    width: 48px;
    height: 48px;
    color: var(--accent);
    animation: iconGlow 2s ease-in-out infinite;
    z-index: 1;
}

.learning-icon svg {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0 0 8px rgba(0, 0, 0, 0.2));
}

@keyframes iconGlow {
    0%, 100% {
        transform: scale(1) rotate(0deg);
        filter: drop-shadow(0 0 4px rgba(0, 0, 0, 0.1));
    }
    25% {
        transform: scale(1.05) rotate(2deg);
    }
    50% {
        transform: scale(1.1) rotate(0deg);
        filter: drop-shadow(0 0 12px rgba(0, 0, 0, 0.2));
    }
    75% {
        transform: scale(1.05) rotate(-2deg);
    }
}

.learning-text {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-primary);
    transition: all 0.3s ease;
    min-height: 1.5em;
    text-align: center;
}

.learning-text.fade {
    opacity: 0;
    transform: translateY(-6px) scale(0.95);
}

.learning-bar-container {
    width: 70%;
    height: 4px;
    background: var(--border);
    border-radius: 4px;
    overflow: hidden;
    position: relative;
}

.learning-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent) 0%, #444 50%, var(--accent) 100%);
    background-size: 200% 100%;
    border-radius: 4px;
    transition: width 0.5s ease-out;
    animation: shimmer 2s linear infinite;
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.learning-percent {
    font-family: var(--font-mono);
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    animation: percentPulse 1s ease-in-out infinite;
}

@keyframes percentPulse {
    0%, 100% { opacity: 0.8; }
    50% { opacity: 1; }
}

/* ============================================
   Empty State
   ============================================ */

.empty-state {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: var(--spacing-xl);
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* ============================================
   PDF Viewer Modal
   ============================================ */

.pdf-modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.pdf-modal.active {
    opacity: 1;
    visibility: visible;
}

.pdf-modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
}

.pdf-modal-container {
    position: relative;
    width: 90vw;
    max-width: 1000px;
    height: 90vh;
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg), 0 0 0 1px var(--border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transform: scale(0.95);
    transition: transform var(--transition-base);
}

.pdf-modal.active .pdf-modal-container {
    transform: scale(1);
}

.pdf-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border);
    background: var(--bg-secondary);
}

.pdf-modal-title {
    font-weight: 500;
    font-size: 0.9375rem;
    color: var(--text-primary);
    max-width: 300px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.pdf-modal-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

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

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

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

.pdf-close-btn:hover {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error);
}

.pdf-controls-divider {
    width: 1px;
    height: 20px;
    background: var(--border);
    margin: 0 var(--spacing-xs);
}

.pdf-page-info,
.pdf-zoom-info {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    min-width: 60px;
    text-align: center;
}

.pdf-modal-body {
    flex: 1;
    overflow: auto;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: var(--spacing-lg);
    background: var(--bg-tertiary);
}

#pdfCanvas {
    max-width: 100%;
    height: auto;
    box-shadow: var(--shadow-lg);
    background: white;
}

/* Theme toggle button */
.btn-theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-theme-toggle:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-hover);
    color: var(--text-primary);
}

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

.btn-theme-toggle .icon-sun {
    display: block;
}

.btn-theme-toggle .icon-moon {
    display: none;
}

html.light-mode .btn-theme-toggle .icon-sun {
    display: none;
}

html.light-mode .btn-theme-toggle .icon-moon {
    display: block;
}

.pdf-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    color: var(--text-muted);
    font-size: 0.875rem;
}

.pdf-loading-spinner {
    width: 32px;
    height: 32px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ============================================
   Login Button & Modal
   ============================================ */

.btn-login {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
}

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

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

/* Login Modal */
.login-modal {
    position: fixed;
    inset: 0;
    z-index: 1100;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.login-modal.active {
    opacity: 1;
    visibility: visible;
}

.login-modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.login-modal-container {
    position: relative;
    width: 100%;
    max-width: 360px;
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg), 0 0 0 1px var(--border);
    transform: scale(0.95) translateY(10px);
    transition: transform var(--transition-base);
}

.login-modal.active .login-modal-container {
    transform: scale(1) translateY(0);
}

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

.login-modal-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.login-close-btn {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.login-close-btn:hover {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error);
}

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

.login-form {
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.login-field {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.login-field label {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.login-field input {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.login-field input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.05);
}

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

.login-error {
    font-size: 0.8125rem;
    color: var(--error);
    min-height: 1.25rem;
}

.btn-login-submit {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--accent);
    color: var(--bg-primary);
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    min-height: 40px;
}

.btn-login-submit:hover:not(.loading) {
    background: var(--accent-hover);
}

.btn-login-submit.loading {
    cursor: wait;
    background: var(--text-secondary);
}

.btn-login-submit.loading .login-submit-text {
    opacity: 0;
}

.btn-login-submit.loading .login-submit-loading {
    display: flex;
}

.login-submit-loading {
    display: none;
    position: absolute;
    inset: 0;
    align-items: center;
    justify-content: center;
    gap: 4px;
}

.login-submit-loading span {
    width: 6px;
    height: 6px;
    background: var(--bg-primary);
    border-radius: 50%;
    animation: loginDots 1.4s ease-in-out infinite;
}

.login-submit-loading span:nth-child(2) {
    animation-delay: 0.2s;
}

.login-submit-loading span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes loginDots {
    0%, 80%, 100% { opacity: 0.3; transform: scale(0.8); }
    40% { opacity: 1; transform: scale(1); }
}

/* Chat disabled state */
.chat-input:disabled {
    background: var(--bg-tertiary);
    cursor: not-allowed;
}

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

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

/* Chat Login Overlay */
.chat-login-overlay {
    position: absolute;
    inset: 52px 0 0 0;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    opacity: 1;
    transition: opacity var(--transition-base);
}

.chat-login-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.chat-login-content {
    text-align: center;
    padding: var(--spacing-xl);
    max-width: 280px;
}

.chat-login-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: 50%;
    color: var(--text-muted);
}

.chat-login-icon svg {
    width: 28px;
    height: 28px;
}

.chat-login-content h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.chat-login-content p {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-lg);
    line-height: 1.5;
}

.btn-chat-login {
    padding: var(--spacing-sm) var(--spacing-xl);
    background: var(--accent);
    color: var(--bg-primary);
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-chat-login:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

/* ============================================
   Citations Section
   ============================================ */

.citations-section {
    margin-top: var(--spacing-md);
    border-top: 1px solid var(--border);
    padding-top: var(--spacing-sm);
}

.citations-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: none;
    border: none;
    padding: var(--spacing-sm) 0;
    cursor: pointer;
    color: var(--text-muted);
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    font-weight: 500;
    transition: color var(--transition-fast);
    width: 100%;
}

.citations-toggle:hover {
    color: var(--text-secondary);
}

.citations-icon {
    width: 16px;
    height: 16px;
}

.citations-chevron {
    width: 14px;
    height: 14px;
    margin-left: auto;
    transition: transform var(--transition-base);
}

.citations-section.expanded .citations-chevron {
    transform: rotate(180deg);
}

.citations-content {
    display: none;
    padding: var(--spacing-sm) 0;
}

.citations-section.expanded .citations-content {
    display: block;
}

.citation-item {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border);
}

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

.citation-number {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent);
    flex-shrink: 0;
}

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

.citation-source {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    display: block;
    margin-bottom: var(--spacing-xs);
}

.citation-quote {
    font-size: 0.8125rem;
    font-style: italic;
    color: var(--text-muted);
    margin: 0;
    padding-left: var(--spacing-sm);
    border-left: 2px solid var(--border);
    line-height: 1.5;
}

/* ============================================
   Page Images Gallery
   ============================================ */

.page-images-strip {
    display: flex;
    gap: 8px;
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--border);
    overflow-x: auto;
    scrollbar-width: thin;
}

.page-image-thumb {
    position: relative;
    flex: 0 0 auto;
    width: 80px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    cursor: pointer;
    transition: border-color var(--transition-fast), transform 0.15s ease;
}

.page-image-thumb:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.page-image-thumb img {
    display: block;
    width: 100%;
    height: auto;
}

.page-image-badge {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    text-align: center;
    font-size: 0.625rem;
    font-weight: 600;
    color: #fff;
    background: rgba(0, 0, 0, 0.6);
    padding: 1px 0;
    font-family: var(--font-mono);
}

/* Image Lightbox Modal */
.image-lightbox {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.image-lightbox.active {
    opacity: 1;
}

.image-lightbox-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.85);
}

.image-lightbox-content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.image-lightbox-content img {
    max-width: 90vw;
    max-height: 85vh;
    object-fit: contain;
    border-radius: var(--radius-md);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.image-lightbox-close {
    position: absolute;
    top: -40px;
    right: -10px;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 2rem;
    cursor: pointer;
    line-height: 1;
    padding: 4px 8px;
    transition: color var(--transition-fast);
}

.image-lightbox-close:hover {
    color: var(--text-primary);
}

.image-lightbox-caption {
    margin-top: var(--spacing-sm);
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.image-lightbox-prev,
.image-lightbox-next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: rgba(255, 255, 255, 0.7);
    transition: all 0.15s;
    z-index: 2;
}

.image-lightbox-prev { left: -60px; }
.image-lightbox-next { right: -60px; }

.image-lightbox-prev:hover,
.image-lightbox-next:hover {
    background: rgba(0, 0, 0, 0.8);
    color: #fff;
    border-color: rgba(255, 255, 255, 0.4);
}

.image-lightbox-prev svg,
.image-lightbox-next svg {
    width: 22px;
    height: 22px;
}

@media (max-width: 768px) {
    .image-lightbox-prev { left: 8px; }
    .image-lightbox-next { right: 8px; }
}

/* ============================================
   Reasoning/Thinking Section
   ============================================ */

.reasoning-section {
    margin-bottom: var(--spacing-md);
    border: 1px solid #92400e;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, #1a1410 0%, #1f1a14 100%);
    overflow: hidden;
}

.reasoning-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: none;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    color: #fbbf24;
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    width: 100%;
}

.reasoning-toggle:hover {
    background: rgba(255, 255, 255, 0.03);
}

.reasoning-icon {
    width: 16px;
    height: 16px;
    color: #f59e0b;
}

.reasoning-chevron {
    width: 14px;
    height: 14px;
    margin-left: auto;
    transition: transform var(--transition-base);
    color: #fbbf24;
}

.reasoning-section.expanded .reasoning-chevron {
    transform: rotate(180deg);
}

.reasoning-content {
    display: none;
    padding: 0 var(--spacing-md) var(--spacing-md);
}

.reasoning-section.expanded .reasoning-content {
    display: block;
    animation: reasoningFadeIn 0.3s ease-out;
}

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

.reasoning-text {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    line-height: 1.6;
    color: #fcd34d;
    white-space: pre-wrap;
    word-break: break-word;
    padding: var(--spacing-md);
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-sm);
    border-left: 3px solid #f59e0b;
}

/* Light mode reasoning section */
html.light-mode .reasoning-section {
    border-color: #fde68a;
    background: linear-gradient(135deg, #fefce8 0%, #fef9c3 100%);
}

html.light-mode .reasoning-toggle {
    color: #854d0e;
}

html.light-mode .reasoning-icon {
    color: #ca8a04;
}

html.light-mode .reasoning-chevron {
    color: #854d0e;
}

html.light-mode .reasoning-text {
    color: #713f12;
    background: rgba(255, 255, 255, 0.5);
    border-left-color: #ca8a04;
}

/* Answer Section (after reasoning) */
.answer-section {
    margin-top: 0;
}

.reasoning-section + .answer-section {
    margin-top: var(--spacing-md);
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 768px) {
    .app-header {
        padding: 0 var(--spacing-md);
    }

    .logo h1 {
        font-size: 1rem;
    }

    .status-text {
        display: none;
    }

    .header-status {
        gap: 0;
    }

    .btn-deploy {
        padding: 0 var(--spacing-md);
        font-size: 0.75rem;
    }

    .app-main {
        flex-direction: column;
    }

    .sidebar {
        display: none;
        position: fixed;
        inset: var(--header-height) 0 56px 0;
        width: 100%;
        z-index: 50;
    }

    .sidebar.active {
        display: flex;
    }

    .panel-chat {
        height: calc(100vh - var(--header-height) - 56px);
    }

    .panel-chat.hidden {
        display: none;
    }

    .mobile-nav {
        display: flex;
    }

    .app-footer {
        display: none;
    }

    .chat-messages {
        padding: var(--spacing-md);
        padding-bottom: 100px;
    }

    .chat-input-container {
        padding: var(--spacing-md);
        position: fixed;
        bottom: 56px;
        left: 0;
        right: 0;
        z-index: 50;
        background: var(--bg-primary);
        border-top: 1px solid var(--border);
    }

    .message {
        max-width: 85%;
    }

    .document-bar {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .document-selector-btn {
        min-width: 140px;
        max-width: 180px;
    }

    .chat-header-title {
        display: none;
    }

    /* Mobile PDF modal */
    .pdf-modal-container {
        width: 100vw;
        height: 100vh;
        border-radius: 0;
    }

    .pdf-modal-title {
        max-width: 150px;
        font-size: 0.875rem;
    }

    .pdf-modal-controls {
        gap: 2px;
    }

    .pdf-control-btn {
        width: 28px;
        height: 28px;
    }

    .pdf-page-info,
    .pdf-zoom-info {
        min-width: 50px;
        font-size: 0.6875rem;
    }

    .pdf-controls-divider {
        display: none;
    }
}

/* ============================================
   Utilities
   ============================================ */

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ============================================
   Persona Selector
   ============================================ */

.persona-selector {
    position: relative;
}

.persona-selector-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    min-width: 160px;
    max-width: 260px;
}

.persona-selector-btn:hover {
    border-color: var(--border-hover);
    background: var(--bg-card-hover);
}

.persona-selector.open .persona-selector-btn {
    border-color: var(--accent);
}

.persona-selector-btn.locked {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

.persona-icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    color: var(--text-muted);
}

.persona-name {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--text-primary);
    font-weight: 500;
}

.persona-chevron {
    width: 14px;
    height: 14px;
    color: var(--text-muted);
    flex-shrink: 0;
    transition: transform var(--transition-fast);
}

.persona-selector.open .persona-chevron {
    transform: rotate(180deg);
}

/* Persona Dropdown */
.persona-dropdown {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    width: 280px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all var(--transition-fast);
}

.persona-selector.open .persona-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.persona-dropdown .dropdown-item-icon.persona {
    width: 32px;
    height: 32px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.persona-dropdown .dropdown-item-icon.persona svg {
    width: 18px;
    height: 18px;
    color: var(--text-muted);
}

.persona-dropdown .dropdown-item.active .dropdown-item-icon.persona {
    background: var(--accent);
}

.persona-dropdown .dropdown-item.active .dropdown-item-icon.persona svg {
    color: var(--bg-primary);
}

.dropdown-item-check {
    width: 20px;
    height: 20px;
    color: var(--success);
    flex-shrink: 0;
}

.default-tag {
    display: inline-block;
    padding: 1px 6px;
    background: var(--accent-soft);
    color: var(--text-secondary);
    font-size: 0.6875rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    margin-left: 6px;
}

.dropdown-manage-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 0.8125rem;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.dropdown-manage-btn:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

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

/* ============================================
   Admin Page
   ============================================ */

.admin-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background: var(--bg-secondary);
}

.admin-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    padding: 0 var(--spacing-xl);
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.admin-logo a {
    display: flex;
    align-items: center;
}

.admin-logo .logo-img {
    height: 32px;
    width: auto;
}

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

.btn-back {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.btn-back:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    color: var(--text-primary);
}

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

.admin-main {
    flex: 1;
    padding: var(--spacing-xl);
    overflow-y: auto;
}

.admin-content {
    max-width: 900px;
    margin: 0 auto;
}

.personas-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
}

.personas-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.btn-add-persona {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--accent);
    color: var(--bg-primary);
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-add-persona:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

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

.personas-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.persona-card {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-fast);
}

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

.persona-card.default {
    border-color: var(--accent);
}

.persona-card-header {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.persona-avatar {
    width: 48px;
    height: 48px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.persona-card.default .persona-avatar {
    background: var(--accent);
}

.persona-avatar svg {
    width: 24px;
    height: 24px;
    color: var(--text-muted);
}

.persona-card.default .persona-avatar svg {
    color: var(--bg-primary);
}

.persona-info {
    flex: 1;
    min-width: 0;
}

.persona-card .persona-name {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.default-badge {
    display: inline-block;
    padding: 2px 8px;
    background: var(--accent);
    color: var(--bg-primary);
    font-size: 0.6875rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
}

.persona-card .persona-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.persona-prompt-preview {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.prompt-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-sm);
}

.persona-prompt-preview p {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--text-secondary);
    line-height: 1.6;
    white-space: pre-wrap;
    word-break: break-word;
}

.persona-card-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.persona-card-actions .btn-edit,
.persona-card-actions .btn-delete {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.persona-card-actions .btn-edit:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.persona-card-actions .btn-delete:hover {
    border-color: var(--error);
    color: var(--error);
}

.persona-card-actions svg {
    width: 14px;
    height: 14px;
}

.admin-footer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border);
    background: var(--bg-primary);
}

.admin-footer .powered-by {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.admin-footer .powered-logo {
    height: 20px;
    width: auto;
}

/* Persona Modal */
.persona-modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1200;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.persona-modal.active {
    opacity: 1;
    visibility: visible;
}

.persona-modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
}

.persona-modal-container {
    position: relative;
    width: 100%;
    max-width: 560px;
    max-height: 90vh;
    margin: var(--spacing-lg);
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    transform: translateY(20px);
    transition: transform var(--transition-base);
}

.persona-modal.active .persona-modal-container {
    transform: translateY(0);
}

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

.persona-modal-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
}

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

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

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

.persona-form {
    padding: var(--spacing-xl);
    overflow-y: auto;
}

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

.form-field label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.form-field input,
.form-field textarea {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    color: var(--text-primary);
    transition: border-color var(--transition-fast);
}

.form-field textarea {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    resize: vertical;
    min-height: 120px;
}

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

.form-field input::placeholder,
.form-field textarea::placeholder {
    color: var(--text-muted);
}

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

.form-field-checkbox {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
}

.form-field-checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.form-field-checkbox label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    cursor: pointer;
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border);
}

.btn-cancel {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.btn-save {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--accent);
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--bg-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

/* Version History */
.version-history { margin-top: 4px; }
.version-history > label { font-size: 0.75rem; font-weight: 500; color: var(--text-secondary); margin-bottom: 8px; display: block; }
.version-list { max-height: 200px; overflow-y: auto; display: flex; flex-direction: column; gap: 6px; }
.version-item { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: 8px; padding: 10px 12px; font-size: 0.75rem; }
.version-item.current { border-color: var(--accent); }
.version-item-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 4px; }
.version-label { font-weight: 600; color: var(--text-primary); }
.version-date { color: var(--text-tertiary); font-size: 0.6875rem; }
.version-note { color: var(--accent); font-size: 0.6875rem; margin-bottom: 4px; }
.version-preview { color: var(--text-secondary); font-size: 0.6875rem; line-height: 1.4; margin-bottom: 6px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.version-actions { display: flex; gap: 8px; }
.btn-version-view, .btn-version-restore { background: none; border: 1px solid var(--border); border-radius: 4px; padding: 3px 10px; font-size: 0.6875rem; cursor: pointer; color: var(--text-secondary); font-family: var(--font-sans); transition: all 0.15s; }
.btn-version-view:hover { background: var(--bg-tertiary); color: var(--text-primary); }
.btn-version-restore { color: var(--accent); border-color: var(--accent); }
.btn-version-restore:hover { background: var(--accent); color: white; }

/* Admin Page States */
.loading-state,
.error-state,
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--text-muted);
}

/* Mobile responsiveness for persona selector */
@media (max-width: 768px) {
    .persona-selector-btn {
        min-width: 120px;
        max-width: 160px;
    }

    .persona-dropdown {
        width: 260px;
        left: auto;
        right: 0;
    }

    .admin-main {
        padding: var(--spacing-md);
    }

    .personas-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }

    .persona-card-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .persona-modal-container {
        margin: var(--spacing-md);
        max-height: 95vh;
    }
}

/* ============================================
   New Sidebar Styles (Expandable Sections)
   ============================================ */

.sidebar {
    display: flex;
    flex-direction: column;
}

.sidebar-section {
    border-bottom: 1px solid var(--border);
}

.section-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    width: 100%;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    transition: background var(--transition-fast);
}

.section-header:hover {
    background: var(--bg-tertiary);
}

.section-chevron {
    width: 16px;
    height: 16px;
    color: var(--text-muted);
    transition: transform var(--transition-base);
    flex-shrink: 0;
}

.sidebar-section.expanded .section-chevron {
    transform: rotate(90deg);
}

.section-count {
    margin-left: auto;
    background: var(--bg-tertiary);
    color: var(--text-muted);
    font-size: 0.75rem;
    font-weight: 500;
    padding: 0.125rem 0.5rem;
    border-radius: 10px;
}

.section-content {
    display: none;
    padding: 0 var(--spacing-sm) var(--spacing-sm);
    max-height: calc(10 * 48px);
    overflow: hidden;
}

.sidebar-section.expanded .section-content {
    display: flex;
    flex-direction: column;
}

.section-content .btn-section-action {
    flex-shrink: 0;
}

.btn-section-action {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    width: 100%;
    margin-bottom: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--accent);
    color: #ffffff;
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
}

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

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

/* Document List in Sidebar */
.document-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    min-height: 0;
    max-height: 200px;
    overflow-y: auto;
}

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

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

.document-item.active {
    background: var(--accent-soft);
}

.document-item-icon {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.5rem;
    font-weight: 600;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.document-item.active .document-item-icon {
    background: var(--accent);
    color: #ffffff;
}

.document-item-info {
    flex: 1;
    min-width: 0;
}

.document-item-name {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.document-item-meta {
    font-size: 0.6875rem;
    color: var(--text-muted);
    margin-top: 2px;
}

.document-item-actions {
    display: flex;
    gap: 2px;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.document-item:hover .document-item-actions {
    opacity: 1;
}

.document-item-btn {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.document-item-btn:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}

.document-item-btn.delete:hover {
    color: var(--error);
}

.document-item-btn svg {
    width: 14px;
    height: 14px;
}

/* Sidebar Link (Settings) */
.sidebar-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    border: none;
    border-bottom: 1px solid var(--border);
    background: none;
    width: 100%;
    cursor: pointer;
    font-family: var(--font-sans);
}

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

.sidebar-link svg {
    width: 18px;
    height: 18px;
}

/* Sidebar Footer */
.sidebar-footer {
    margin-top: auto;
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.sidebar-footer .powered-by {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.sidebar-footer .powered-logo {
    height: 20px;
    width: auto;
}

/* Selected Document Display in Document Bar */
.selected-document {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    min-width: 180px;
    max-width: 250px;
}

.selected-document .doc-icon {
    width: 16px;
    height: 16px;
    color: var(--accent);
    flex-shrink: 0;
}

.selected-document .doc-name {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.selected-document.has-doc .doc-name {
    color: var(--text-primary);
    font-weight: 500;
}

/* ============================================
   Settings Section Styles (Admin Page)
   ============================================ */

.settings-section {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
}

.settings-section-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border);
}

.settings-section-header h2 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.settings-section-content {
    padding: var(--spacing-lg);
}

.settings-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

/* ============================================
   Chat-Only Layout (User Page)
   ============================================ */

.chat-only .app-main {
    display: flex;
}

.chat-only .panel-chat {
    flex: 1;
    min-width: 0;
    max-width: 100%;
}

/* Chat Sidebar */
.chat-sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border);
    background: var(--bg-secondary);
    height: 100%;
}

.chat-sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
}

.btn-new-chat {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s ease;
}

.btn-new-chat:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

.btn-new-chat svg {
    width: 14px;
    height: 14px;
}

.chat-sidebar-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}

.chat-sidebar-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    border-bottom: 1px solid var(--border);
}

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

.chat-sidebar-item:hover {
    background: var(--bg-tertiary);
}

.chat-sidebar-item.active {
    background: var(--bg-primary);
    box-shadow: var(--shadow-sm);
}

.chat-sidebar-item-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.chat-sidebar-item.active .chat-sidebar-item-icon {
    background: var(--accent);
}

.chat-sidebar-item.active .chat-sidebar-item-icon svg {
    color: var(--bg-primary);
}

.chat-sidebar-item-icon svg {
    width: 16px;
    height: 16px;
    color: var(--text-muted);
}

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

.chat-sidebar-item-title {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chat-sidebar-item-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 2px;
}

.chat-sidebar-item-delete {
    display: none;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    flex-shrink: 0;
    transition: all var(--transition-fast);
}

.chat-sidebar-item-delete:hover {
    background: var(--error);
    color: white;
}

.chat-sidebar-item-delete svg {
    width: 14px;
    height: 14px;
}

.chat-sidebar-item:hover .chat-sidebar-item-delete {
    display: flex;
}

.chat-sidebar .empty-state {
    padding: 24px 16px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8125rem;
}

@media (max-width: 768px) {
    .chat-sidebar {
        display: none;
    }
}

.btn-icon-header {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s ease;
}

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

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

.btn-login.admin-link {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

.btn-login.admin-link:hover {
    background: var(--accent-hover);
}

/* ============================================
   Language Toggle Button
   ============================================ */

.btn-lang-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    padding: 0;
}

.btn-lang-toggle .fi {
    font-size: 18px;
    border-radius: 2px;
}

.btn-lang-toggle:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-hover);
}