/**
 * Chat Assistant Styles
 * Modern chat interface with sidebar, messages, and tool integration
 * Version: 1.1.0 - Aligned with SurveyOps design system
 */

/* ============================
   CSS Variable Mappings
   Map to main.css design tokens
   ============================ */

.chat-container {
    --color-primary: var(--primary-blue, #0078D4);
    --color-primary-hover: var(--primary-dark, #004578);
    --color-primary-bg: rgba(0, 120, 212, 0.1);
    --color-surface: var(--bg-white, #fff);
    --color-background: var(--bg-light, #F9FAFB);
    --color-text: var(--text-primary, #1F2937);
    --color-text-secondary: var(--text-secondary, #6B7280);
    --color-border: var(--border-light, #E5E7EB);
    --color-success: var(--success-green, #10B981);
    --color-success-bg: var(--success-light, #D1FAE5);
    --color-warning: var(--warning-orange, #F59E0B);
    --color-warning-bg: var(--warning-light, #FEF3C7);
    --color-warning-text: #92400E;
    --color-danger: var(--error-red, #EF4444);
    --color-danger-bg: var(--error-light, #FEE2E2);
    --color-info: var(--accent-cyan, #00D4FF);
    --color-info-bg: rgba(0, 212, 255, 0.1);
}

/* ============================
   Layout & Container
   ============================ */

.chat-container {
    max-width: 1694px;
    padding: 0 20px;
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
    box-sizing: border-box;
}

/* Override the default header gradient for chat page */
.chat-container header {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-dark) 100%);
    padding: 36px 24px;
    min-height: 200px;
    position: relative;
    flex-shrink: 0;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    margin: 36px;
}

.chat-container header .header-content h1 {
    font-size: 1.5rem;
    margin-bottom: 4px;
}

.chat-container header .header-content .subtitle {
    font-size: 0.9375rem;
    opacity: 0.95;
}

.chat-layout {
    display: flex;
    flex: 1;
    overflow: hidden;
    background: var(--color-background);
    margin: 0 36px 36px 36px;
    border-radius: 12px;
}

/* ============================
   Sidebar
   ============================ */

.chat-sidebar {
    width: 260px;
    min-width: 260px;
    background: var(--color-surface);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    transition: all var(--transition-base, 0.25s) ease;
    flex-shrink: 0;
}

.chat-sidebar.collapsed {
    margin-left: -260px;
    width: 0;
    min-width: 0;
    overflow: hidden;
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 16px;
    border-bottom: 1px solid var(--color-border, #e0e0e0);
    background: var(--bg-light);
}

.sidebar-header h3 {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text, #333);
}

.new-chat-btn {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 8px 12px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--primary-dark, #004578) 100%);
    color: white;
    border: none;
    border-radius: var(--radius-sm, 8px);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast, 0.15s);
    box-shadow: var(--shadow-xs, 0 1px 2px rgba(0, 0, 0, 0.05));
}

.new-chat-btn:hover {
    box-shadow: var(--shadow-md, 0 4px 6px rgba(0, 0, 0, 0.1)), 0 0 16px rgba(0, 120, 212, 0.25);
    transform: translateY(-2px);
    filter: brightness(1.05);
}

.new-chat-btn:active {
    transform: translateY(0);
    filter: brightness(0.95);
}

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

.session-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px;
    margin-bottom: 4px;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-fast, 0.15s);
    border: 1px solid transparent;
}

.session-item:hover {
    background: var(--color-background, #f5f5f5);
    transform: translateX(2px);
    border-color: var(--color-border);
}

.session-item.active {
    background: linear-gradient(135deg, var(--color-primary-bg), rgba(0, 212, 255, 0.05));
    border-left: 3px solid var(--color-primary);
    box-shadow: 0 2px 8px rgba(0, 120, 212, 0.1);
}

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

.session-title {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text, #333);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.session-date {
    font-size: 0.75rem;
    color: var(--color-text-secondary, #666);
    margin-top: 2px;
}

.session-delete {
    opacity: 0;
    padding: 4px 8px;
    background: none;
    border: none;
    color: var(--color-danger, #dc3545);
    cursor: pointer;
    border-radius: 4px;
    transition: opacity 0.2s, background-color 0.2s;
}

.session-item:hover .session-delete {
    opacity: 1;
}

.session-delete:hover {
    background: rgba(220, 53, 69, 0.1);
}

.sidebar-footer {
    padding: 12px;
    border-top: 1px solid var(--color-border, #e0e0e0);
    background: var(--bg-light);
}

.sidebar-btn {
    width: 100%;
    padding: 10px;
    background: none;
    border: 1px solid var(--color-border, #e0e0e0);
    border-radius: 6px;
    color: var(--color-text-secondary, #666);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.sidebar-btn:hover {
    background: var(--color-background, #f5f5f5);
    color: var(--color-danger, #dc3545);
    border-color: var(--color-danger, #dc3545);
}

/* ============================
   Main Chat Area
   ============================ */

.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    background: var(--color-background, #f8f9fa);
}

/* ============================
   Chat Controls Bar
   ============================ */

.chat-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 16px;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
}

.chat-controls-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.chat-controls-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.sidebar-toggle {
    padding: 8px 12px;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm, 8px);
    font-size: 1.125rem;
    cursor: pointer;
    transition: all var(--transition-fast, 0.15s);
}

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

.response-mode-selector {
    display: flex;
    align-items: center;
    gap: 8px;
}

.response-mode-selector label {
    font-size: 0.875rem;
    color: var(--color-text-secondary, #666);
}

.response-mode-selector select {
    padding: 6px 12px;
    border: 1px solid var(--color-border, #e0e0e0);
    border-radius: 6px;
    background: var(--color-surface, #fff);
    font-size: 0.875rem;
    cursor: pointer;
}

.help-btn {
    padding: 8px 16px;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm, 8px);
    color: var(--color-text);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-fast, 0.15s);
}

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

/* ============================
   Messages Area
   ============================ */

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    max-width: 900px;
    width: 100%;
    margin: 0 auto;
}

/* ============================
   Welcome Screen
   ============================ */

.welcome-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 40px 20px;
    flex: 1;
}

.welcome-screen.hidden {
    display: none;
}

.welcome-icon {
    font-size: 4.5rem;
    margin-bottom: 20px;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-8px);
    }
}

.welcome-screen h2 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--color-text);
    margin: 0 0 12px 0;
    letter-spacing: -0.02em;
}

.welcome-screen>p {
    font-size: 1rem;
    color: var(--color-text-secondary, #666);
    max-width: 500px;
    margin: 0 0 32px 0;
}

.capability-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    max-width: 720px;
    width: 100%;
    margin-bottom: 36px;
}

.capability-card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: 16px 18px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md, 12px);
    cursor: pointer;
    transition: all var(--transition-fast, 0.15s);
    box-shadow: var(--shadow-xs);
}

.capability-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md, 0 4px 6px rgba(0, 0, 0, 0.1));
    transform: translateY(-3px);
    background: linear-gradient(135deg, var(--bg-white) 0%, var(--bg-light) 100%);
}

.capability-icon {
    font-size: 1.75rem;
    margin-bottom: 4px;
}

.capability-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-text, #333);
}

.capability-desc {
    font-size: 0.8rem;
    color: var(--color-text-secondary, #666);
}

.tool-categories h3 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin: 0 0 14px 0;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.tool-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}

.tool-tag {
    padding: 6px 14px;
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full, 9999px);
    font-size: 0.8rem;
    color: var(--color-text);
    transition: all var(--transition-fast, 0.15s);
}

.tool-tag:hover {
    border-color: var(--color-primary);
    background: var(--color-primary-bg);
    color: var(--color-primary);
}

/* ============================
   Message Bubbles
   ============================ */

.message {
    display: flex;
    gap: 12px;
    max-width: 85%;
    animation: messageSlideIn var(--transition-base, 0.25s) ease;
}

@keyframes messageSlideIn {
    from {
        opacity: 0;
        transform: translateY(12px) scale(0.98);
    }

    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

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

.message.assistant {
    align-self: flex-start;
    align-items: flex-start;
}

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    flex-shrink: 0;
    box-shadow: var(--shadow-sm);
}

.message.user .message-avatar {
    background: linear-gradient(135deg, #6EE7B7 0%, #34D399 100%);
}

.message.assistant .message-avatar {
    background: linear-gradient(135deg, #93C5FD 0%, #A78BFA 100%);
}

.message-content {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.message-bubble {
    padding: 12px 16px;
    border-radius: 16px;
    line-height: 1.5;
    word-break: break-word;
}

.message.user .message-bubble {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-hover) 100%);
    color: white;
    border-bottom-right-radius: 4px;
    box-shadow: var(--shadow-sm);
}

.message.assistant .message-bubble {
    background: var(--color-surface);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    border-top-left-radius: 4px;
    box-shadow: var(--shadow-xs);
}

/* Markdown content styling */
.message-bubble h1,
.message-bubble h2,
.message-bubble h3 {
    margin: 16px 0 8px 0;
    font-weight: 600;
}

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

.message-bubble p {
    margin: 0 0 8px 0;
}

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

.message-bubble ul,
.message-bubble ol {
    margin: 8px 0;
    padding-left: 20px;
}

.message-bubble li {
    margin: 4px 0;
}

.message-bubble code {
    background: rgba(0, 0, 0, 0.1);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 0.9em;
}

.message.user .message-bubble code {
    background: rgba(255, 255, 255, 0.2);
}

.message-bubble pre {
    background: var(--color-surface-dark, #1e1e1e);
    color: #d4d4d4;
    padding: 12px 16px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 8px 0;
}

.message-bubble pre code {
    background: none;
    padding: 0;
    color: inherit;
}

/* Clickable SQL queries */
.message-bubble code.clickable-query {
    cursor: pointer;
    background: linear-gradient(135deg, rgba(0, 128, 255, 0.15), rgba(0, 200, 255, 0.1));
    border: 1px solid rgba(0, 128, 255, 0.3);
    transition: all 0.2s ease;
}

.message-bubble code.clickable-query:hover {
    background: linear-gradient(135deg, rgba(0, 128, 255, 0.25), rgba(0, 200, 255, 0.2));
    border-color: rgba(0, 128, 255, 0.5);
    box-shadow: 0 2px 8px rgba(0, 128, 255, 0.2);
    transform: translateY(-1px);
}

.message-bubble pre code.clickable-query {
    display: block;
    cursor: pointer;
    border: 1px solid rgba(0, 128, 255, 0.3);
    border-radius: 6px;
    padding: 12px 16px;
    background: linear-gradient(135deg, rgba(0, 128, 255, 0.08), rgba(0, 200, 255, 0.05));
    transition: all 0.2s ease;
}

.message-bubble pre code.clickable-query:hover {
    border-color: rgba(0, 128, 255, 0.5);
    background: linear-gradient(135deg, rgba(0, 128, 255, 0.15), rgba(0, 200, 255, 0.1));
    box-shadow: 0 2px 12px rgba(0, 128, 255, 0.15);
}

.message-bubble table {
    border-collapse: collapse;
    width: 100%;
    margin: 8px 0;
}

.message-bubble th,
.message-bubble td {
    border: 1px solid var(--color-border, #e0e0e0);
    padding: 8px 12px;
    text-align: left;
}

.message-bubble th {
    background: var(--color-background, #f5f5f5);
    font-weight: 600;
}

.message-time {
    font-size: 0.7rem;
    color: var(--color-text-secondary, #999);
    align-self: flex-end;
}

/* ============================
   Tool Call Indicators
   ============================ */

.tool-calls {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 8px;
}

.tool-call-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    background: var(--color-info-bg, #e8f4fd);
    border: 1px solid var(--color-info, #17a2b8);
    border-radius: 16px;
    font-size: 0.75rem;
    color: var(--color-info, #17a2b8);
}

.tool-call-badge.success {
    background: var(--color-success-bg, #d4edda);
    border-color: var(--color-success, #28a745);
    color: var(--color-success, #28a745);
}

.tool-call-badge.error {
    background: var(--color-danger-bg, #f8d7da);
    border-color: var(--color-danger, #dc3545);
    color: var(--color-danger, #dc3545);
}

.tool-call-badge.pending {
    background: var(--color-warning-bg, #fff3cd);
    border-color: var(--color-warning, #ffc107);
    color: var(--color-warning-text, #856404);
}

.tool-call-badge .spinner-tiny {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 12px;
    height: 12px;
}

.tool-call-badge .spinner-tiny svg {
    width: 100%;
    height: 100%;
}

/* ============================
   Thinking Indicator
   ============================ */

.thinking-indicator {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    background: var(--color-surface, #fff);
    border-top: 1px solid var(--color-border, #e0e0e0);
}

.thinking-indicator.hidden {
    display: none;
}

.thinking-dots {
    display: flex;
    gap: 4px;
}

.thinking-dots span {
    width: 8px;
    height: 8px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--accent-purple, #8B5CF6) 100%);
    border-radius: 50%;
    animation: bounce 1.4s infinite ease-in-out both;
}

.thinking-dots span:nth-child(1) {
    animation-delay: -0.32s;
}

.thinking-dots span:nth-child(2) {
    animation-delay: -0.16s;
}

@keyframes bounce {

    0%,
    80%,
    100% {
        transform: scale(0);
    }

    40% {
        transform: scale(1);
    }
}

.thinking-text {
    font-size: 0.875rem;
    color: var(--color-text-secondary, #666);
}

/* ============================
   Chat Input
   ============================ */

.chat-input-area {
    padding: 20px 24px 24px;
    background: linear-gradient(180deg, rgba(249, 250, 251, 0.8) 0%, var(--color-surface) 100%);
    border-top: 1px solid var(--color-border);
    flex-shrink: 0;
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
}

.chat-form {
    display: flex;
    gap: 16px;
    align-items: flex-end;
    max-width: 900px;
    margin: 0 auto;
    background: var(--color-surface);
    padding: 8px 8px 8px 20px;
    border-radius: 16px;
    border: 1px solid var(--color-border);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06), 0 1px 3px rgba(0, 0, 0, 0.04);
    transition: border-color var(--transition-fast, 0.15s), box-shadow var(--transition-fast, 0.15s);
}

.chat-form:focus-within {
    border-color: var(--color-primary);
    box-shadow: 0 4px 20px rgba(0, 120, 212, 0.1), 0 0 0 3px var(--color-primary-bg);
}

.input-wrapper {
    flex: 1;
    position: relative;
}

.input-wrapper textarea {
    width: 100%;
    padding: 12px 0;
    padding-right: 40px;
    border: none;
    border-radius: 0;
    font-size: 1rem;
    font-family: inherit;
    line-height: 1.5;
    resize: none;
    min-height: 24px;
    max-height: 200px;
    transition: none;
    background: transparent;
    color: var(--color-text);
}

.input-wrapper textarea:focus {
    outline: none;
    border-color: transparent;
    box-shadow: none;
}

.input-wrapper textarea::placeholder {
    color: var(--color-text-secondary, #9CA3AF);
}

.char-count {
    position: absolute;
    right: 4px;
    bottom: 14px;
    font-size: 0.7rem;
    color: var(--color-text-secondary, #999);
    background: var(--color-surface);
    padding: 2px 4px;
    border-radius: 4px;
}

.char-count.warning {
    color: var(--color-warning, #ffc107);
}

.char-count.danger {
    color: var(--color-danger, #dc3545);
}

.send-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 20px;
    min-width: 100px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-hover) 100%);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast, 0.15s);
    box-shadow: 0 2px 8px rgba(0, 120, 212, 0.25);
    letter-spacing: 0.01em;
}

.send-btn:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--color-primary-hover) 0%, #003d6d 100%);
    box-shadow: 0 4px 12px rgba(0, 120, 212, 0.35);
    transform: translateY(-1px);
}

.send-btn:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: 0 2px 6px rgba(0, 120, 212, 0.25);
}

.send-btn:disabled {
    background: linear-gradient(135deg, #D1D5DB 0%, #9CA3AF 100%);
    color: #fff;
    cursor: not-allowed;
    box-shadow: none;
}

.send-icon {
    font-size: 1rem;
}

.input-hints {
    margin-top: 12px;
    text-align: center;
    font-size: 0.8125rem;
    color: var(--color-text-secondary, #9CA3AF);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.input-hints kbd {
    display: inline-block;
    padding: 3px 8px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-family: inherit;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

/* ============================
   Tools Panel
   ============================ */

.tools-panel {
    width: 320px;
    min-width: 320px;
    background: var(--color-surface, #fff);
    border-left: 1px solid var(--color-border, #e0e0e0);
    display: flex;
    flex-direction: column;
}

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

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    border-bottom: 1px solid var(--color-border, #e0e0e0);
}

.panel-header h3 {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
}

.close-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--color-text-secondary, #666);
    cursor: pointer;
    border-radius: 6px;
    transition: background-color 0.2s ease;
}

.close-btn:hover {
    background: var(--color-background, #f5f5f5);
}

.tools-list {
    flex: 1;
    overflow-y: auto;
    padding: 12px;
}

.tool-item {
    padding: 12px;
    margin-bottom: 8px;
    background: var(--color-background, #f8f9fa);
    border: 1px solid var(--color-border, #e0e0e0);
    border-radius: 8px;
}

.tool-item-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 4px;
}

.tool-item-icon {
    font-size: 1rem;
}

.tool-item-name {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--color-text, #333);
}

.tool-item-category {
    font-size: 0.7rem;
    padding: 2px 6px;
    background: var(--color-primary-bg, #e8f0fe);
    color: var(--color-primary, #4a90d9);
    border-radius: 4px;
    margin-left: auto;
}

.tool-item-desc {
    font-size: 0.8rem;
    color: var(--color-text-secondary, #666);
    line-height: 1.4;
}

/* ============================
   Modal Styles
   ============================ */

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 24px;
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
}

.modal-overlay.hidden {
    display: none;
}

.modal-content {
    background: var(--bg-white);
    border-radius: var(--radius-xl);
    max-width: 700px;
    width: 100%;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-2xl);
    border: 1px solid var(--border-light);
    animation: modalSlideIn var(--transition-base) ease;
    overflow: hidden;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 28px;
    border-bottom: 1px solid var(--border-light);
    background: linear-gradient(135deg, var(--bg-light) 0%, var(--bg-white) 100%);
    position: relative;
}

.modal-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-blue) 0%, var(--accent-cyan) 50%, var(--accent-purple) 100%);
}

.modal-header h2 {
    margin: 0;
    font-size: 1.375rem;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-close {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-white);
    border: 1px solid var(--border-light);
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--error-red);
    color: white;
    border-color: var(--error-red);
    transform: scale(1.05);
}

.modal-body {
    flex: 1;
    overflow-y: auto;
    padding: 28px;
    background: var(--bg-white);
}

/* Tools Modal Specific */
.tools-modal .tool-category {
    margin-bottom: 28px;
}

.tools-modal .tool-category:last-child {
    margin-bottom: 0;
}

.tools-modal .tool-category h3 {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 0 0 16px 0;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-light);
}

.tools-modal .tool-category-list {
    display: grid;
    gap: 10px;
}

.tools-modal .modal-tool-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 14px 18px;
    background: var(--bg-light);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.tools-modal .modal-tool-item:hover {
    background: var(--bg-white);
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-sm);
}

.tools-modal .modal-tool-header {
    display: flex;
    align-items: center;
    gap: 8px;
}

.tools-modal .modal-tool-name {
    font-weight: 600;
    font-size: 0.9375rem;
    color: var(--primary-blue);
}

.tools-modal .modal-tool-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.tools-modal .modal-tool-examples {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    margin-top: 4px;
    padding-top: 8px;
    border-top: 1px solid var(--border-light);
}

.tools-modal .examples-label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.tools-modal .example-btn {
    font-size: 0.8rem;
    padding: 4px 10px;
    background: var(--bg-white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-style: italic;
}

.tools-modal .example-btn:hover {
    background: var(--primary-blue);
    border-color: var(--primary-blue);
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

/* ============================
   Toast Notifications
   Note: Core toast styles are in main.css
   Only chat-specific overrides here
   ============================ */

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

@media (max-width: 992px) {
    .chat-sidebar {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        z-index: 200;
        box-shadow: 4px 0 20px rgba(0, 0, 0, 0.15);
        width: 280px;
        min-width: 280px;
    }

    .chat-sidebar.collapsed {
        margin-left: -280px;
    }

    .chat-sidebar:not(.collapsed)+.chat-main::before {
        content: '';
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.4);
        z-index: 150;
    }

    .tools-panel {
        position: fixed;
        right: 0;
        top: 0;
        bottom: 0;
        z-index: 200;
        box-shadow: -4px 0 20px rgba(0, 0, 0, 0.15);
    }
}

@media (max-width: 768px) {
    .chat-container header {
        padding: 16px 20px;
    }

    .chat-container header .header-content h1 {
        font-size: 1.25rem;
    }

    .chat-controls {
        flex-wrap: wrap;
        gap: 10px;
        padding: 10px 12px;
    }

    .chat-controls-right {
        width: 100%;
        justify-content: flex-end;
    }

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

    .message {
        max-width: 95%;
    }

    .chat-sidebar {
        width: 100%;
        min-width: 100%;
    }

    .chat-sidebar.collapsed {
        margin-left: -100%;
    }

    .tools-panel {
        width: 100%;
        min-width: 100%;
    }

    .chat-messages {
        padding: 16px;
    }

    .chat-input-area {
        padding: 12px 16px 16px;
    }
}

@media (max-width: 480px) {
    .chat-form {
        flex-direction: column;
    }

    .send-btn {
        width: 100%;
        justify-content: center;
    }

    .response-mode-selector {
        display: none;
    }
}