/* ========================================
   KnowledgAI - Industrial Elegance
   Professional Knowledge Base Stylesheet
   ======================================== */

/* CSS Custom Properties */
:root {
    --kai-primary: #4f46e5;
    --kai-primary-hover: #4338ca;
    --kai-primary-light: rgba(79, 70, 229, 0.08);
    --kai-primary-rgb: 79, 70, 229;
    --kai-secondary: #7c3aed;
    --kai-accent: #0891b2;
    --kai-success: #16a34a;
    --kai-warning: #d97706;
    --kai-error: #dc2626;
    --kai-bg: #ffffff;
    --kai-bg-secondary: #fafafa;
    --kai-bg-tertiary: #f4f4f5;
    --kai-surface: #ffffff;
    --kai-text: #18181b;
    --kai-text-secondary: #52525b;
    --kai-text-muted: #a1a1aa;
    --kai-border: #e4e4e7;
    --kai-border-hover: #d4d4d8;
    --kai-shadow: 0 1px 2px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.06);
    --kai-shadow-md: 0 2px 4px rgba(0,0,0,0.03), 0 4px 12px rgba(0,0,0,0.06);
    --kai-shadow-lg: 0 4px 8px rgba(0,0,0,0.03), 0 8px 24px rgba(0,0,0,0.08);
    --kai-shadow-xl: 0 8px 16px rgba(0,0,0,0.04), 0 16px 40px rgba(0,0,0,0.1);
    --kai-shadow-focus: 0 0 0 3px rgba(79, 70, 229, 0.15);
    --kai-radius: 12px;
    --kai-radius-sm: 8px;
    --kai-radius-lg: 16px;
    --kai-radius-xl: 24px;
    --kai-transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --kai-transition-fast: 0.15s;
    --kai-transition-slow: 0.3s;
    --kai-font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --kai-font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', Menlo, Consolas, monospace;
    --kai-max-width: 1280px;
    --kai-content-width: 720px;
}

/* Smooth scroll */
html {
    scroll-behavior: smooth;
}

/* Selection color */
::selection {
    background: rgba(var(--kai-primary-rgb), 0.15);
    color: var(--kai-text);
}

/* Custom scrollbar */
.kai-wrap ::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

.kai-wrap ::-webkit-scrollbar-track {
    background: transparent;
}

.kai-wrap ::-webkit-scrollbar-thumb {
    background: var(--kai-border-hover);
    border-radius: 3px;
}

.kai-wrap ::-webkit-scrollbar-thumb:hover {
    background: var(--kai-text-muted);
}

/* Reset & Base */
.kai-wrap *,
.kai-wrap *::before,
.kai-wrap *::after { box-sizing: border-box; }

.kai-wrap {
    font-family: var(--kai-font);
    color: var(--kai-text);
    line-height: 1.6;
    max-width: var(--kai-max-width);
    margin: 0 auto;
    padding: 0 24px 110px 24px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.kai-wrap a {
    color: var(--kai-primary);
    text-decoration: none;
    transition: color var(--kai-transition-fast) ease;
}
.kai-wrap a:hover { color: var(--kai-primary-hover); }

/* Focus-visible for keyboard navigation */
.kai-wrap *:focus-visible {
    outline: 2px solid var(--kai-primary);
    outline-offset: 2px;
    border-radius: 4px;
}

.kai-wrap button:focus-visible,
.kai-wrap input:focus-visible {
    outline: 2px solid var(--kai-primary);
    outline-offset: 2px;
}

/* ==================
   HEADER / HERO
   ================== */
.kai-hero {
    text-align: center;
    padding: 80px 0 48px;
    position: relative;
}

.kai-hero::before {
    content: '';
    position: absolute;
    top: -40px;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 600px;
    background: radial-gradient(ellipse at center, rgba(var(--kai-primary-rgb), 0.04) 0%, rgba(251, 191, 36, 0.02) 30%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.kai-hero-content { position: relative; z-index: 1; }

.kai-hero h1 {
    font-size: 48px;
    font-weight: 800;
    color: var(--kai-text);
    margin: 0 0 12px;
    letter-spacing: -0.03em;
    line-height: 1.1;
}

.kai-hero-subtitle {
    font-size: 18px;
    color: var(--kai-text-secondary);
    margin: 0 0 40px;
    font-weight: 400;
    max-width: 540px;
    margin-left: auto;
    margin-right: auto;
}

/* ==================
   FIXED BOTTOM SEARCH BAR
   ================== */
.kai-bottom-search-bar.kai-inline-search-wrap {
    position: fixed;
    bottom: 0;
    z-index: 500;
    margin-bottom: 0;
    background: transparent;
    border-top: none;
    padding: 12px 0;
    box-shadow: none;
}

.kai-bottom-search-bar .kai-search-container {
    max-width: 100%;
    margin: 0 auto;
    margin-bottom: 0;
    position: relative;
    z-index: 2;
}

.kai-bottom-search-bar .kai-search-bar {
    border-radius: var(--kai-radius-xl);
}

.kai-bottom-search-bar .kai-search-suggestions {
    bottom: 100%;
    top: auto;
    border-radius: var(--kai-radius-lg) var(--kai-radius-lg) 0 0;
    border-top: 1.5px solid var(--kai-border);
    border-bottom: none;
    box-shadow: var(--kai-shadow-xl);
}

.kai-bottom-search-bar .kai-ai-inline-results {
    max-width: 100%;
    margin: 0 auto;
    max-height: 50vh;
    background: var(--kai-surface);
    border: 1px solid var(--kai-border-hover);
    border-radius: var(--kai-radius-lg);
    display: none;
    flex-direction: column;
    position: relative;
    z-index: 1;
    transition: max-height 0.3s ease;
    box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.04), 0 0 0 1px rgba(0, 0, 0, 0.03);
}

.kai-bottom-search-bar .kai-ai-inline-results.kai-visible {
    display: flex;
    border-radius: var(--kai-radius-lg) var(--kai-radius-lg) 0 0;
    border-bottom: none;
    margin-bottom: 0;
}

.kai-bottom-search-bar:has(.kai-ai-inline-results.kai-visible) .kai-search-bar {
    border-radius: 0 0 var(--kai-radius-lg) var(--kai-radius-lg);
    border-top: 1px solid var(--kai-border-hover);
    margin-top: -1px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04), 0 0 0 1px rgba(0, 0, 0, 0.03);
}

.kai-bottom-search-bar:has(.kai-ai-inline-results.kai-visible) .kai-search-bar.expanded {
    border-radius: 0 0 var(--kai-radius-lg) var(--kai-radius-lg);
}

.kai-bottom-search-bar .kai-ai-inline-results.kai-expanded {
    max-height: calc(100vh - 120px);
}

.kai-bottom-search-bar .kai-ai-inline-messages {
    max-height: calc(50vh - 40px);
    overflow-y: auto;
    padding: 12px 24px 20px;
    scroll-behavior: smooth;
}

.kai-bottom-search-bar .kai-ai-inline-results.kai-expanded .kai-ai-inline-messages {
    max-height: calc(100vh - 160px);
}

.kai-ai-inline-header {
    display: flex;
    justify-content: flex-end;
    gap: 4px;
    padding: 6px 8px 0;
    flex-shrink: 0;
}

.kai-ai-inline-expand,
.kai-ai-inline-close {
    width: 28px;
    height: 28px;
    border: none;
    background: transparent;
    color: var(--kai-text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    transition: all var(--kai-transition-fast) ease;
}

.kai-ai-inline-expand:hover,
.kai-ai-inline-close:hover {
    background: var(--kai-bg-tertiary);
    color: var(--kai-text);
}

.kai-search-submit.kai-submit-disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.kai-ai-reopen {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    color: var(--kai-primary);
    cursor: pointer;
    border-radius: var(--kai-radius-sm);
    position: relative;
    transition: all var(--kai-transition-fast) ease;
    flex-shrink: 0;
}

.kai-ai-reopen:hover {
    background: var(--kai-primary-light);
}

.kai-ai-reopen-badge {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--kai-error);
    border: 2px solid var(--kai-surface);
}

/* ==================
   SEARCH BAR (original styles kept for reference)
   ================== */
.kai-search-container {
    max-width: 680px;
    margin: 0 auto 56px;
    position: relative;
}

.kai-search-bar {
    position: relative;
    display: flex;
    align-items: center;
    height: 64px;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1.5px solid var(--kai-border);
    border-radius: var(--kai-radius-xl);
    padding: 6px;
    box-shadow: var(--kai-shadow-lg);
    transition: border-color var(--kai-transition-slow) ease, box-shadow var(--kai-transition-slow) ease;
}

.kai-search-bar:focus-within {
    border-color: var(--kai-primary);
    box-shadow: var(--kai-shadow-focus), var(--kai-shadow-lg);
}

.kai-search-bar.kai-glow {
    border-color: var(--kai-primary);
    box-shadow: 0 0 16px rgba(var(--kai-primary-rgb), 0.25), var(--kai-shadow-lg);
}

.kai-search-bar.expanded {
    border-radius: var(--kai-radius-lg) var(--kai-radius-lg) 0 0;
}

.kai-search-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    flex-shrink: 0;
    color: var(--kai-text-muted);
}

.kai-search-icon svg { width: 22px; height: 22px; max-width: 100%; display: block; }

.kai-search-input {
    flex: 1;
    border: none;
    outline: none;
    font-size: 17px;
    font-family: var(--kai-font);
    color: var(--kai-text);
    background: transparent;
    padding: 12px 4px;
    min-width: 0;
}

.kai-wrap .kai-search-input:focus-visible {
    outline: none;
    box-shadow: none;
}

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

.kai-search-mode-toggle {
    display: flex;
    background: var(--kai-bg-tertiary);
    border-radius: var(--kai-radius);
    padding: 3px;
    margin-right: 4px;
    gap: 2px;
}

.kai-search-mode-btn {
    padding: 8px 14px;
    border: none;
    background: transparent;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    color: var(--kai-text-secondary);
    cursor: pointer;
    transition: all var(--kai-transition-fast) ease;
    white-space: nowrap;
    font-family: var(--kai-font);
}

.kai-search-mode-btn.active {
    background: var(--kai-surface);
    color: var(--kai-primary);
    box-shadow: var(--kai-shadow);
}

.kai-search-mode-btn:hover:not(.active) {
    color: var(--kai-text);
}

.kai-search-mode-btn .kai-ai-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 11px;
    padding: 1px 6px;
    border-radius: 4px;
    background: linear-gradient(135deg, var(--kai-primary), var(--kai-secondary));
    color: white;
    margin-left: 4px;
}

.kai-search-submit {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    border: none;
    background: var(--kai-primary);
    color: white;
    border-radius: 18px;
    cursor: pointer;
    transition: all var(--kai-transition-fast) ease;
    flex-shrink: 0;
}

.kai-search-submit:hover {
    background: var(--kai-primary-hover);
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(var(--kai-primary-rgb), 0.35);
}

/* Search Suggestions Dropdown */
.kai-search-suggestions {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--kai-surface);
    border: 1.5px solid var(--kai-border);
    border-top: none;
    border-radius: 0 0 var(--kai-radius-lg) var(--kai-radius-lg);
    box-shadow: var(--kai-shadow-xl);
    z-index: 100;
    display: none;
    overflow: hidden;
}

.kai-search-suggestions.active { display: block; }

.kai-suggestion-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 20px;
    cursor: pointer;
    transition: background var(--kai-transition-fast) ease;
    border-bottom: 1px solid var(--kai-bg-tertiary);
}

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

.kai-suggestion-item:hover,
.kai-suggestion-item.active {
    background: var(--kai-primary-light);
}

.kai-suggestion-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--kai-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--kai-bg-tertiary);
    color: var(--kai-text-muted);
    flex-shrink: 0;
}

.kai-suggestion-text { flex: 1; min-width: 0; }
.kai-suggestion-title { font-size: 14px; font-weight: 500; color: var(--kai-text); }
.kai-suggestion-category { font-size: 12px; color: var(--kai-text-muted); }

.kai-suggestion-footer {
    padding: 12px 20px;
    text-align: center;
    background: var(--kai-bg-secondary);
    font-size: 13px;
}

.kai-suggestion-footer a { font-weight: 500; }

/* ==================
   AI CHAT INTERFACE
   ================== */
.kai-ai-chat {
    background: var(--kai-surface);
    border: 1px solid var(--kai-border);
    border-radius: var(--kai-radius-lg);
    overflow: hidden;
    margin-top: 24px;
}

.kai-ai-messages {
    max-height: 600px;
    overflow-y: auto;
    padding: 24px;
    scroll-behavior: smooth;
}

.kai-ai-message {
    margin-bottom: 24px;
    animation: kai-fade-in var(--kai-transition-slow) ease;
}

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

.kai-ai-message-user {
    display: flex;
    justify-content: flex-end;
}

.kai-ai-message-user .kai-ai-bubble {
    background: var(--kai-primary);
    color: white;
    border-radius: 20px 20px 4px 20px;
    max-width: 80%;
}

.kai-ai-message-assistant {
    display: flex;
    justify-content: flex-start;
}

.kai-ai-message-assistant .kai-ai-bubble {
    background: var(--kai-bg-secondary);
    color: var(--kai-text);
    border-radius: 20px 20px 20px 4px;
    max-width: 90%;
    border: 1px solid var(--kai-border);
}

.kai-ai-bubble {
    padding: 16px 20px;
    font-size: 15px;
    line-height: 1.7;
}

.kai-ai-bubble h1, .kai-ai-bubble h2, .kai-ai-bubble h3 {
    margin: 16px 0 8px;
    font-weight: 600;
}

.kai-ai-bubble h1 { font-size: 20px; }
.kai-ai-bubble h2 { font-size: 18px; }
.kai-ai-bubble h3 { font-size: 16px; }

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

.kai-ai-bubble ul, .kai-ai-bubble ol {
    margin: 8px 0;
    padding-left: 24px;
}

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

.kai-ai-bubble code {
    background: rgba(var(--kai-primary-rgb), 0.08);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--kai-font-mono);
    font-size: 13px;
}

.kai-ai-bubble pre {
    background: #1e293b;
    color: #e2e8f0;
    padding: 16px;
    border-radius: var(--kai-radius-sm);
    overflow-x: auto;
    margin: 12px 0;
}

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

.kai-ai-bubble a {
    color: var(--kai-primary, #4f46e5);
    text-decoration: underline;
    word-break: break-word;
}
.kai-ai-bubble a:hover {
    opacity: 0.8;
}

/* AI Sources */
.kai-ai-sources {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--kai-border);
}

.kai-ai-sources-title {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--kai-text-muted);
    margin-bottom: 8px;
}

.kai-ai-source-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--kai-surface);
    border: 1px solid var(--kai-border);
    border-radius: var(--kai-radius-sm);
    font-size: 13px;
    margin: 4px 4px 4px 0;
    transition: all var(--kai-transition-fast) ease;
}

.kai-ai-source-item:hover {
    border-color: var(--kai-primary);
    background: var(--kai-primary-light);
}

.kai-ai-source-icon {
    width: 16px;
    height: 16px;
    color: var(--kai-primary);
}

/* AI Suggestions */
.kai-ai-suggestions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 16px;
}

.kai-ai-suggestion-chip {
    padding: 8px 16px;
    background: var(--kai-surface);
    border: 1px solid var(--kai-border);
    border-radius: 20px;
    font-size: 13px;
    color: var(--kai-text-secondary);
    cursor: pointer;
    transition: all var(--kai-transition-fast) ease;
    font-family: var(--kai-font);
}

.kai-ai-suggestion-chip:hover {
    border-color: var(--kai-primary);
    color: var(--kai-primary);
    background: var(--kai-primary-light);
}

.kai-ai-suggestion-chip-lg {
    font-size: 16px;
    padding: 12px 24px;
    border-radius: 24px;
    background: var(--kai-primary);
    color: white;
    border-color: var(--kai-primary);
}

.kai-ai-suggestion-chip-lg:hover {
    background: var(--kai-primary-hover);
    color: white;
    border-color: var(--kai-primary-hover);
}

/* AI Loading animation */
.kai-ai-typing {
    display: flex;
    gap: 6px;
    padding: 16px 20px;
}

.kai-ai-typing span {
    width: 8px;
    height: 8px;
    background: var(--kai-text-muted);
    border-radius: 50%;
    animation: kai-typing 1.4s infinite;
}

.kai-ai-typing span:nth-child(2) { animation-delay: 0.2s; }
.kai-ai-typing span:nth-child(3) { animation-delay: 0.4s; }

@keyframes kai-typing {
    0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; }
    40% { transform: scale(1); opacity: 1; }
}

/* ==================
   INLINE AI SEARCH
   ================== */
.kai-ai-inline-results {
    background: var(--kai-surface);
    border: 1px solid var(--kai-border);
    border-radius: var(--kai-radius-lg);
    overflow: hidden;
}

.kai-ai-inline-messages {
    max-height: 500px;
    overflow-y: auto;
    padding: 20px 24px;
    scroll-behavior: smooth;
}

/* ==================
   PRODUCT/CATEGORY SEARCH ADJUSTMENT
   ================== */
.kai-ai-agent-status {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 0;
}

.kai-ai-agent-icon {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--kai-primary), var(--kai-secondary));
    position: relative;
    flex-shrink: 0;
    animation: kai-agent-pulse 2s ease-in-out infinite;
}

.kai-ai-agent-icon::after {
    content: '';
    position: absolute;
    inset: -4px;
    border-radius: 50%;
    border: 2px solid var(--kai-primary);
    opacity: 0.3;
    animation: kai-agent-ring 2s ease-in-out infinite;
}

@keyframes kai-agent-pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

@keyframes kai-agent-ring {
    0% { transform: scale(1); opacity: 0.3; }
    50% { transform: scale(1.3); opacity: 0; }
    100% { transform: scale(1); opacity: 0; }
}

.kai-ai-agent-text {
    font-size: 14px;
    color: var(--kai-text-secondary);
    font-style: italic;
    animation: kai-agent-fade 0.5s ease;
}

@keyframes kai-agent-fade {
    from { opacity: 0.3; }
    to { opacity: 1; }
}

.kai-ai-tool-steps {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 14px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--kai-border);
}

.kai-ai-tool-step {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    background: var(--kai-bg-secondary);
    border-radius: 12px;
    font-size: 11px;
    color: var(--kai-text-muted);
}

.kai-ai-tool-step-icon {
    color: var(--kai-success);
    font-size: 12px;
    font-weight: 700;
}

.kai-ai-bubble.kai-ai-error {
    border-color: var(--kai-error);
    color: var(--kai-error);
    background: rgba(220, 38, 38, 0.04);
}

.kai-ai-fallback-warning {
    padding: 8px 12px;
    margin-bottom: 12px;
    background: rgba(217, 119, 6, 0.08);
    border: 1px solid rgba(217, 119, 6, 0.2);
    border-radius: var(--kai-radius-sm);
    font-size: 13px;
    color: var(--kai-warning);
}

@media (max-width: 768px) {
    .kai-ai-inline-messages {
        max-height: 400px;
        padding: 16px;
    }
}

@media (max-width: 480px) {
    .kai-ai-inline-messages {
        max-height: 350px;
        padding: 12px;
    }
}

/* ==================
   PRODUCT/CATEGORY SEARCH ADJUSTMENT
   ================== */
/* Floating AI Button */
.kai-ai-fab {
    position: fixed;
    bottom: 108px;
    right: 28px;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--kai-primary), var(--kai-secondary));
    color: white;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 14px rgba(var(--kai-primary-rgb), 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--kai-transition-slow) cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
    font-size: 24px;
}

.kai-ai-fab:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(var(--kai-primary-rgb), 0.5);
}

.kai-ai-fab svg { width: 28px; height: 28px; }

/* AI Chat Panel (slides in from right) */
.kai-ai-panel {
    position: fixed;
    top: 0;
    right: -420px;
    width: 400px;
    height: 100vh;
    background: var(--kai-surface);
    box-shadow: -4px 0 32px rgba(0,0,0,0.12);
    z-index: 1001;
    transition: right var(--kai-transition-slow) cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
}

.kai-ai-panel.open { right: 0; }

.kai-ai-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 20px;
    border-bottom: 1px solid var(--kai-border);
    flex-shrink: 0;
    background: linear-gradient(180deg, var(--kai-bg-secondary) 0%, var(--kai-surface) 100%);
    position: relative;
}

.kai-ai-panel-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 20px;
    right: 20px;
    height: 2px;
    background: linear-gradient(90deg, var(--kai-primary), var(--kai-secondary));
    opacity: 0.3;
    border-radius: 1px;
}

.kai-ai-panel-header h3 {
    font-size: 16px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.kai-ai-panel-close {
    width: 36px;
    height: 36px;
    border: none;
    background: var(--kai-bg-tertiary);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--kai-transition-fast) ease;
    color: var(--kai-text-secondary);
}

.kai-ai-panel-close:hover { background: var(--kai-border); color: var(--kai-text); }

.kai-ai-panel-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

.kai-ai-panel-input {
    display: flex;
    gap: 8px;
    padding: 16px 20px;
    border-top: 1px solid var(--kai-border);
    flex-shrink: 0;
    background: var(--kai-bg-secondary);
}

.kai-ai-panel-input input {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--kai-border);
    border-radius: var(--kai-radius);
    font-size: 14px;
    font-family: var(--kai-font);
    outline: none;
    transition: border-color var(--kai-transition-fast) ease, box-shadow var(--kai-transition-fast) ease;
    background: var(--kai-surface);
}

.kai-ai-panel-input input:focus {
    border-color: var(--kai-primary);
    box-shadow: 0 0 0 3px rgba(var(--kai-primary-rgb), 0.1);
}

.kai-ai-panel-input button {
    padding: 12px 20px;
    background: var(--kai-primary);
    color: white;
    border: none;
    border-radius: var(--kai-radius);
    font-size: 14px;
    cursor: pointer;
    transition: all var(--kai-transition-fast) ease;
    font-weight: 500;
    font-family: var(--kai-font);
}

.kai-ai-panel-input button:hover { background: var(--kai-primary-hover); }

.kai-ai-overlay {
    position: fixed;
    inset: 0;
    background: rgba(24, 24, 27, 0.25);
    z-index: 1000;
    display: none;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.kai-ai-overlay.active { display: block; }

/* ==================
   CATEGORY GRID
   ================== */
.kai-categories {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 48px;
}

@media (max-width: 900px) { .kai-categories { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .kai-categories { grid-template-columns: 1fr; } }

.kai-category-card {
    background: var(--kai-surface);
    border: 1px solid var(--kai-border);
    border-radius: var(--kai-radius);
    padding: 28px;
    transition: all var(--kai-transition-slow) cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    text-decoration: none;
    display: block;
    color: var(--kai-text);
}

.kai-category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--kai-primary), var(--kai-secondary));
    opacity: 0;
    transition: opacity var(--kai-transition-slow) ease;
}

.kai-category-card:hover {
    border-color: var(--kai-primary);
    box-shadow: var(--kai-shadow-lg);
    transform: translateY(-3px);
    color: var(--kai-text);
}

.kai-category-card:hover::before { opacity: 1; }

.kai-category-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--kai-radius-sm);
    background: linear-gradient(135deg, var(--kai-primary-light), rgba(var(--kai-primary-rgb), 0.04));
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 18px;
    font-size: 24px;
    color: var(--kai-primary);
    transition: all var(--kai-transition-slow) ease;
}

.kai-category-card:hover .kai-category-icon {
    background: var(--kai-primary);
    color: white;
    box-shadow: 0 4px 12px rgba(var(--kai-primary-rgb), 0.3);
}

.kai-category-name {
    font-size: 17px;
    font-weight: 600;
    margin: 0 0 6px;
    color: var(--kai-text);
}

.kai-category-desc {
    font-size: 14px;
    color: var(--kai-text-secondary);
    margin: 0 0 14px;
    line-height: 1.5;
}

.kai-category-count {
    font-size: 13px;
    color: var(--kai-text-muted);
    display: flex;
    align-items: center;
    gap: 4px;
}

.kai-category-children {
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px solid var(--kai-bg-tertiary);
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.kai-category-child {
    font-size: 12px;
    padding: 4px 12px;
    background: var(--kai-bg-tertiary);
    border-radius: 12px;
    color: var(--kai-text-secondary);
    transition: all var(--kai-transition-fast) ease;
}

.kai-category-card:hover .kai-category-child {
    background: var(--kai-primary-light);
    color: var(--kai-primary);
}

/* ==================
   ARTICLE CARDS
   ================== */
.kai-articles-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-bottom: 32px;
}

@media (max-width: 768px) { .kai-articles-grid { grid-template-columns: 1fr; } }

.kai-article-card {
    background: var(--kai-surface);
    border: 1px solid var(--kai-border);
    border-radius: var(--kai-radius);
    padding: 20px 20px 20px 24px;
    transition: all var(--kai-transition-slow) cubic-bezier(0.4, 0, 0.2, 1);
    display: block;
    color: var(--kai-text);
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.kai-article-card::after {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--kai-primary);
    transform: scaleY(0);
    transition: transform var(--kai-transition-slow) cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 0 2px 2px 0;
}

.kai-article-card:hover {
    border-color: var(--kai-primary);
    box-shadow: var(--kai-shadow-md);
    transform: translateY(-1px);
    color: var(--kai-text);
}

.kai-article-card:hover::after {
    transform: scaleY(1);
}

.kai-category-card.kai-hover-active {
    border-color: var(--kai-primary);
    box-shadow: var(--kai-shadow-lg);
    transform: translateY(-3px);
}

.kai-category-card.kai-hover-active::before { opacity: 1; }

.kai-category-card.kai-hover-active .kai-category-icon {
    background: var(--kai-primary);
    color: white;
    box-shadow: 0 4px 12px rgba(var(--kai-primary-rgb), 0.3);
}

.kai-category-card.kai-hover-active .kai-category-child {
    background: var(--kai-primary-light);
    color: var(--kai-primary);
}

.kai-article-card.kai-hover-active {
    border-color: var(--kai-primary);
    box-shadow: var(--kai-shadow-md);
    transform: translateY(-1px);
    color: var(--kai-text);
}

.kai-article-card.kai-hover-active::after {
    transform: scaleY(1);
}

.kai-article-card.kai-hover-active .kai-article-card-title {
    color: var(--kai-primary);
}

.kai-article-card-title {
    font-size: 16px;
    font-weight: 600;
    margin: 0 0 8px;
    color: var(--kai-text);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.kai-article-card:hover .kai-article-card-title { color: var(--kai-primary); }

.kai-article-card-excerpt {
    font-size: 13px;
    color: var(--kai-text-secondary);
    margin: 0 0 12px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.5;
    position: relative;
}

.kai-article-card-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 12px;
    color: var(--kai-text-muted);
}

.kai-article-meta-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* ==================
   ARTICLE SINGLE
   ================== */
.kai-article-layout {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 48px;
    align-items: start;
}

.kai-article-layout.sidebar-left { grid-template-columns: 280px 1fr; }
.kai-article-layout.no-sidebar { grid-template-columns: 1fr; max-width: 800px; margin: 0 auto; }

@media (max-width: 900px) {
    .kai-article-layout, .kai-article-layout.sidebar-left {
        grid-template-columns: 1fr;
    }
}

.kai-article-main {}

.kai-article-header {
    margin-bottom: 36px;
    padding-bottom: 28px;
    border-bottom: 1px solid var(--kai-border);
}

.kai-article-title {
    font-size: 36px;
    font-weight: 800;
    color: var(--kai-text);
    margin: 0 0 16px;
    letter-spacing: -0.025em;
    line-height: 1.15;
    max-width: var(--kai-content-width);
}

.kai-article-meta {
    display: flex;
    align-items: center;
    gap: 20px;
    font-size: 14px;
    color: var(--kai-text-secondary);
    flex-wrap: wrap;
}

.kai-article-content {
    font-size: 16px;
    line-height: 1.8;
    color: var(--kai-text);
    max-width: var(--kai-content-width);
}

.kai-article-content h1 { font-size: 28px; font-weight: 700; margin: 36px 0 16px; letter-spacing: -0.02em; }
.kai-article-content h2 {
    font-size: 24px;
    font-weight: 700;
    margin: 32px 0 14px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--kai-bg-tertiary);
    letter-spacing: -0.015em;
    position: relative;
    padding-left: 16px;
}
.kai-article-content h2::before {
    content: '';
    position: absolute;
    left: 0;
    top: 4px;
    bottom: 14px;
    width: 3px;
    background: var(--kai-primary);
    border-radius: 2px;
}
.kai-article-content h3 { font-size: 20px; font-weight: 600; margin: 28px 0 12px; letter-spacing: -0.01em; }
.kai-article-content h4 { font-size: 18px; font-weight: 600; margin: 24px 0 10px; }

.kai-article-content p { margin: 0 0 16px; }

.kai-article-content ul, .kai-article-content ol {
    margin: 0 0 16px;
    padding-left: 24px;
}

.kai-article-content li { margin: 4px 0; }

.kai-article-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--kai-radius-sm);
    margin: 20px 0;
    box-shadow: var(--kai-shadow-md);
}

.kai-article-content blockquote {
    border-left: 3px solid var(--kai-primary);
    padding: 16px 20px 16px 24px;
    background: var(--kai-bg-secondary);
    border-radius: 0 var(--kai-radius-sm) var(--kai-radius-sm) 0;
    margin: 20px 0;
    font-style: italic;
    color: var(--kai-text-secondary);
    position: relative;
}

.kai-article-content blockquote::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 5px;
    background: linear-gradient(180deg, var(--kai-primary), var(--kai-secondary));
    border-radius: 3px 0 0 3px;
}

.kai-article-content pre {
    background: #1e293b;
    color: #e2e8f0;
    padding: 20px 24px;
    border-radius: var(--kai-radius-sm);
    overflow-x: auto;
    margin: 20px 0;
    font-family: var(--kai-font-mono);
    font-size: 14px;
    line-height: 1.7;
    border: 1px solid #334155;
}

.kai-article-content code {
    font-family: var(--kai-font-mono);
    font-size: 14px;
}

.kai-article-content :not(pre) > code {
    background: rgba(var(--kai-primary-rgb), 0.08);
    padding: 2px 8px;
    border-radius: 4px;
    color: var(--kai-primary);
    font-size: 13px;
}

.kai-article-content a { color: var(--kai-primary); font-weight: 500; }
.kai-article-content a:hover { text-decoration: underline; }

.kai-article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    font-size: 14px;
    border-radius: var(--kai-radius-sm);
    overflow: hidden;
    border: 1px solid var(--kai-border);
}

.kai-article-content th, .kai-article-content td {
    padding: 12px 16px;
    border: 1px solid var(--kai-border);
    text-align: left;
}

.kai-article-content th {
    background: var(--kai-bg-secondary);
    font-weight: 600;
    color: var(--kai-text);
}

.kai-article-content tr:nth-child(even) td {
    background: var(--kai-bg-secondary);
}

.kai-article-content tr:hover td {
    background: var(--kai-primary-light);
}

/* Article Actions */
.kai-article-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 40px;
    padding-top: 28px;
    border-top: 1px solid var(--kai-border);
}

.kai-action-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 18px;
    min-height: 44px;
    border: 1px solid var(--kai-border);
    border-radius: var(--kai-radius);
    background: var(--kai-surface);
    color: var(--kai-text-secondary);
    font-size: 14px;
    cursor: pointer;
    transition: all var(--kai-transition-fast) ease;
    font-family: var(--kai-font);
}

.kai-action-btn:hover {
    border-color: var(--kai-primary);
    color: var(--kai-primary);
    background: var(--kai-primary-light);
}

.kai-action-btn.liked {
    background: var(--kai-primary-light);
    border-color: var(--kai-primary);
    color: var(--kai-primary);
}

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

/* ==================
   SIDEBAR
   ================== */
.kai-sidebar {
    position: sticky;
    top: 24px;
}

.kai-sidebar-section {
    background: var(--kai-surface);
    border: 1px solid var(--kai-border);
    border-radius: var(--kai-radius);
    padding: 20px;
    margin-bottom: 16px;
}

.kai-sidebar-title {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--kai-text-muted);
    margin: 0 0 16px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--kai-bg-tertiary);
}

/* Table of Contents */
.kai-toc { list-style: none; padding: 0; margin: 0; }

.kai-toc-item {
    display: block;
    margin-bottom: 2px;
}

.kai-toc-link {
    display: block;
    padding: 6px 12px;
    font-size: 13px;
    color: var(--kai-text-secondary);
    border-left: 2px solid transparent;
    transition: all var(--kai-transition-fast) ease;
    border-radius: 0 6px 6px 0;
    text-decoration: none;
    line-height: 1.4;
}

.kai-toc-link:hover {
    color: var(--kai-primary);
    background: var(--kai-primary-light);
    border-left-color: var(--kai-border-hover);
}

.kai-toc-link.active {
    color: var(--kai-primary);
    font-weight: 600;
    border-left-color: var(--kai-primary);
    background: var(--kai-primary-light);
    box-shadow: inset 2px 0 0 var(--kai-primary);
    border-left-width: 3px;
    padding-left: 11px;
}

.kai-toc-h2 { padding-left: 12px; }
.kai-toc-h3 { padding-left: 24px; font-size: 12px; }
.kai-toc-h4 { padding-left: 36px; font-size: 12px; }

/* Sidebar Navigation */
.kai-nav-list { list-style: none; padding: 0; margin: 0; }

.kai-nav-item {
    display: block;
    margin-bottom: 2px;
}

.kai-nav-link {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    min-height: 44px;
    font-size: 14px;
    color: var(--kai-text-secondary);
    border-radius: var(--kai-radius-sm);
    transition: all var(--kai-transition-fast) ease;
    text-decoration: none;
}

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

.kai-nav-link.active {
    background: var(--kai-primary-light);
    color: var(--kai-primary);
    font-weight: 500;
}

.kai-nav-icon {
    display: inline-flex;
    align-items: center;
    flex-shrink: 0;
    color: var(--kai-text-muted);
}

.kai-nav-link.active .kai-nav-icon {
    color: var(--kai-primary);
}

.kai-inline-icon {
    display: inline-flex;
    align-items: center;
    vertical-align: middle;
    margin-right: 6px;
}

.kai-nav-children { padding-left: 16px; }

/* Related Articles */
.kai-related-list { list-style: none; padding: 0; margin: 0; counter-reset: related-counter; }

.kai-related-item {
    margin-bottom: 4px;
}

.kai-related-link {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 8px;
    min-height: 44px;
    border-radius: var(--kai-radius-sm);
    transition: all var(--kai-transition-fast) ease;
    text-decoration: none;
    color: var(--kai-text);
}

.kai-related-link:hover {
    background: var(--kai-bg-tertiary);
}

.kai-related-link:hover .kai-related-title { color: var(--kai-primary); }

.kai-related-title {
    font-size: 13px;
    font-weight: 500;
    transition: color var(--kai-transition-fast) ease;
    line-height: 1.4;
}

.kai-related-arrow {
    color: var(--kai-text-muted);
    flex-shrink: 0;
    margin-top: 2px;
    transition: all var(--kai-transition-fast) ease;
}

.kai-related-link:hover .kai-related-arrow { color: var(--kai-primary); transform: translateX(2px); }

/* ==================
   BREADCRUMBS
   ================== */
.kai-breadcrumbs {
    display: flex;
    align-items: center;
    gap: 0;
    font-size: 14px;
    color: var(--kai-text-muted);
    margin-bottom: 28px;
    flex-wrap: wrap;
    padding: 10px 16px;
    background: var(--kai-bg-secondary);
    border-radius: var(--kai-radius-sm);
    border: 1px solid var(--kai-bg-tertiary);
}

.kai-breadcrumb-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.kai-breadcrumb-link {
    color: var(--kai-text-secondary);
    transition: color var(--kai-transition-fast) ease;
    text-decoration: none;
    padding: 2px 0;
}

.kai-breadcrumb-link:hover { color: var(--kai-primary); }

.kai-breadcrumb-sep {
    color: var(--kai-text-muted);
    font-size: 12px;
    margin: 0 4px;
    opacity: 0.6;
}

.kai-breadcrumb-current {
    color: var(--kai-text);
    font-weight: 500;
}

/* ==================
   SEARCH RESULTS
   ================== */
.kai-search-results {
    max-width: 800px;
    margin: 0 auto;
}

.kai-search-results-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.kai-search-header {
    margin-bottom: 32px;
}

.kai-search-header h2 {
    font-size: 24px;
    font-weight: 700;
    margin: 0 0 8px;
}

.kai-search-query {
    color: var(--kai-primary);
    font-style: italic;
}

.kai-search-result {
    background: var(--kai-surface);
    border: 1px solid var(--kai-border);
    border-radius: var(--kai-radius);
    padding: 24px;
    margin-bottom: 16px;
    transition: all var(--kai-transition-slow) cubic-bezier(0.4, 0, 0.2, 1);
    display: block;
    text-decoration: none;
    color: var(--kai-text);
    position: relative;
}

.kai-search-result:hover {
    border-color: var(--kai-primary);
    box-shadow: var(--kai-shadow-md);
    transform: translateX(4px);
}

.kai-search-result-title {
    font-size: 17px;
    font-weight: 600;
    margin: 0 0 8px;
    color: var(--kai-text);
}

.kai-search-result:hover .kai-search-result-title { color: var(--kai-primary); }

.kai-search-result-excerpt {
    font-size: 14px;
    color: var(--kai-text-secondary);
    margin: 0 0 12px;
    line-height: 1.6;
}

.kai-search-result-excerpt mark {
    background: rgba(var(--kai-primary-rgb), 0.15);
    color: var(--kai-primary);
    padding: 1px 4px;
    border-radius: 3px;
}

.kai-search-result-meta {
    display: flex;
    gap: 16px;
    font-size: 13px;
    color: var(--kai-text-muted);
}

.kai-no-results {
    text-align: center;
    padding: 80px 20px;
}

.kai-no-results-icon {
    font-size: 64px;
    margin-bottom: 20px;
    opacity: 0.3;
}

.kai-no-results h3 {
    font-size: 22px;
    font-weight: 600;
    margin: 0 0 8px;
}

.kai-no-results p {
    color: var(--kai-text-secondary);
    margin: 0 0 24px;
    font-size: 16px;
}

/* ==================
   PAGINATION
   ================== */
.kai-pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin: 48px 0;
}

.kai-page-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    height: 44px;
    padding: 0 14px;
    border: 1px solid var(--kai-border);
    border-radius: var(--kai-radius-sm);
    background: var(--kai-surface);
    color: var(--kai-text-secondary);
    font-size: 14px;
    cursor: pointer;
    transition: all var(--kai-transition-fast) ease;
    text-decoration: none;
    font-family: var(--kai-font);
    font-weight: 500;
}

.kai-page-btn:hover {
    border-color: var(--kai-primary);
    color: var(--kai-primary);
    background: var(--kai-primary-light);
}

.kai-page-btn.active {
    background: var(--kai-primary);
    border-color: var(--kai-primary);
    color: white;
    box-shadow: 0 2px 8px rgba(var(--kai-primary-rgb), 0.3);
}

.kai-page-btn.disabled {
    opacity: 0.35;
    cursor: not-allowed;
    pointer-events: none;
}

/* ==================
   WIDGETS
   ================== */
.kai-widget {
    background: var(--kai-surface);
    border: 1px solid var(--kai-border);
    border-radius: var(--kai-radius);
    padding: 20px;
    margin-bottom: 16px;
}

.kai-widget-title {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--kai-text-muted);
    margin: 0 0 16px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--kai-bg-tertiary);
}

/* ==================
   BACK TO TOP
   ================== */
.kai-back-top {
    position: fixed;
    bottom: 108px;
    right: 92px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--kai-surface);
    border: 1px solid var(--kai-border);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--kai-shadow-md);
    transition: all var(--kai-transition-slow) cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0;
    pointer-events: none;
    z-index: 99;
    transform: translateY(8px);
}

.kai-back-top.visible {
    opacity: 1;
    pointer-events: all;
    transform: translateY(0);
}

.kai-back-top:hover {
    transform: translateY(-3px);
    box-shadow: var(--kai-shadow-lg);
    border-color: var(--kai-primary);
    color: var(--kai-primary);
}

/* ==================
   SECTION HEADER
   ================== */
.kai-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.kai-section-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--kai-text);
    margin: 0;
    letter-spacing: -0.015em;
}

.kai-section-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--kai-primary);
    display: flex;
    align-items: center;
    gap: 4px;
    transition: gap var(--kai-transition-fast) ease;
}

.kai-section-link:hover { text-decoration: underline; gap: 6px; }

/* ==================
   SKELETON LOADING
   ================== */
.kai-skeleton {
    background: linear-gradient(90deg, var(--kai-bg-tertiary) 25%, var(--kai-bg-secondary) 50%, var(--kai-bg-tertiary) 75%);
    background-size: 200% 100%;
    animation: kai-skeleton 1.5s ease infinite;
    border-radius: var(--kai-radius-sm);
}

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

.kai-skeleton-text { height: 16px; margin-bottom: 8px; }
.kai-skeleton-text.w-75 { width: 75%; }
.kai-skeleton-text.w-50 { width: 50%; }
.kai-skeleton-title { height: 24px; margin-bottom: 12px; width: 60%; }
.kai-skeleton-card { height: 160px; margin-bottom: 16px; }

/* ==================
   CATEGORY PAGE (NEW)
   ================== */
.kai-category-page-header {
    padding: 48px 0 36px;
    border-bottom: 1px solid var(--kai-border);
    margin-bottom: 36px;
}

.kai-category-page-title {
    font-size: 32px;
    font-weight: 800;
    color: var(--kai-text);
    margin: 0 0 8px;
    letter-spacing: -0.025em;
    line-height: 1.2;
    display: flex;
    align-items: center;
    gap: 12px;
}

.kai-category-page-desc {
    font-size: 16px;
    color: var(--kai-text-secondary);
    margin: 0;
    line-height: 1.6;
    max-width: 640px;
}

/* ==================
   UTILITIES
   ================== */
.kai-text-center { text-align: center; }
.kai-mt-4 { margin-top: 16px; }
.kai-mb-4 { margin-bottom: 16px; }
.kai-mt-8 { margin-top: 32px; }
.kai-mb-8 { margin-bottom: 32px; }
.kai-hidden { display: none !important; }
.kai-flex { display: flex; }
.kai-items-center { align-items: center; }
.kai-gap-2 { gap: 8px; }
.kai-gap-4 { gap: 16px; }

/* ==================
   MOBILE MENU STATE
   ================== */
.kai-sidebar.kai-mobile-open {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1002;
    background: var(--kai-surface);
    overflow-y: auto;
    padding: 20px;
    animation: kai-fade-in 0.2s ease;
}

/* ==================
   RESPONSIVE ENHANCEMENTS
   ================== */
@media (max-width: 768px) {
    .kai-bottom-search-bar.kai-inline-search-wrap {
        padding: 8px 0;
    }

    .kai-bottom-search-bar .kai-search-container {
        padding: 0;
    }

    .kai-bottom-search-bar .kai-ai-inline-messages {
        padding: 12px;
    }

    .kai-hero {
        padding: 48px 0 32px;
    }

    .kai-hero h1 {
        font-size: 32px;
    }

    .kai-hero-subtitle {
        font-size: 16px;
        margin-bottom: 28px;
    }

    .kai-search-container {
        margin-bottom: 36px;
    }

    .kai-search-bar {
        height: 56px;
    }

    .kai-search-icon {
        width: 44px;
        height: 44px;
    }

    .kai-search-submit {
        width: 44px;
        height: 44px;
    }

    .kai-search-mode-toggle {
        display: none;
    }

    .kai-category-card {
        padding: 20px;
    }

    .kai-category-icon {
        width: 44px;
        height: 44px;
        font-size: 20px;
    }

    .kai-section-title {
        font-size: 20px;
    }

    .kai-article-title {
        font-size: 28px;
    }

    .kai-article-content {
        max-width: 100%;
    }

    .kai-breadcrumbs {
        font-size: 13px;
        padding: 8px 12px;
    }

    .kai-pagination {
        gap: 4px;
    }

    .kai-page-btn {
        min-width: 40px;
        height: 40px;
        font-size: 13px;
    }

    .kai-ai-panel {
        width: 100%;
        right: -100%;
    }

    .kai-ai-fab {
        bottom: 96px;
        right: 16px;
        width: 52px;
        height: 52px;
    }

    .kai-back-top {
        right: 76px;
        bottom: 96px;
    }

    .kai-category-page-title {
        font-size: 24px;
    }

    .kai-category-page-header {
        padding: 32px 0 24px;
        margin-bottom: 24px;
    }

    .kai-category-page-desc {
        font-size: 14px;
    }

    .kai-search-result {
        padding: 16px;
    }

    .kai-search-result-meta {
        flex-wrap: wrap;
        gap: 8px;
    }

    .kai-article-content h2 {
        font-size: 20px;
        padding-left: 12px;
    }

    .kai-article-content h3 {
        font-size: 18px;
    }

    .kai-article-content h4 {
        font-size: 16px;
    }

    .kai-article-content pre {
        padding: 14px 16px;
        font-size: 13px;
    }

    .kai-article-meta {
        gap: 12px;
        font-size: 13px;
    }

    .kai-product-header-title {
        font-size: 24px;
    }

    .kai-article-content table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
}

@media (max-width: 480px) {
    .kai-wrap {
        padding: 0 16px 110px 16px;
    }

    .kai-hero {
        padding: 36px 0 24px;
    }

    .kai-hero h1 {
        font-size: 28px;
    }

    .kai-search-bar {
        height: 52px;
        border-radius: var(--kai-radius-lg);
    }

    .kai-articles-grid {
        gap: 12px;
    }

    .kai-article-card {
        padding: 16px 16px 16px 20px;
    }

    .kai-category-page-title {
        font-size: 20px;
        gap: 8px;
    }

    .kai-article-title {
        font-size: 24px;
    }

    .kai-article-actions {
        flex-wrap: wrap;
    }

    .kai-action-btn {
        flex: 1;
        justify-content: center;
        min-width: calc(50% - 6px);
    }

    .kai-product-header-title {
        font-size: 20px;
    }

    .kai-breadcrumb-item {
        font-size: 12px;
    }
}

/* ==================
   PRINT STYLES
   ================== */
@media print {
    .kai-wrap {
        max-width: 100%;
        padding: 0;
        font-size: 12pt;
        line-height: 1.5;
        color: #000;
    }

    .kai-hero::before,
    .kai-category-card::before,
    .kai-article-card::after,
    .kai-article-content h2::before,
    .kai-article-content blockquote::before,
    .kai-ai-panel-header::after {
        display: none !important;
    }

    .kai-search-container,
    .kai-ai-fab,
    .kai-ai-panel,
    .kai-ai-overlay,
    .kai-ai-reopen,
    .kai-back-top,
    .kai-sidebar,
    .kai-article-actions,
    .kai-pagination {
        display: none !important;
    }

    .kai-article-layout,
    .kai-article-layout.sidebar-left {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .kai-article-content {
        max-width: 100%;
    }

    .kai-article-title {
        font-size: 24pt;
        max-width: 100%;
    }

    .kai-breadcrumbs {
        background: none;
        border: none;
        padding: 0;
        font-size: 10pt;
        margin-bottom: 16px;
    }

    .kai-category-card {
        border: 1px solid #ccc;
        break-inside: avoid;
        box-shadow: none;
    }

    .kai-category-card:hover {
        transform: none;
        box-shadow: none;
    }

    .kai-article-card {
        border: 1px solid #ccc;
        break-inside: avoid;
        box-shadow: none;
    }

    .kai-article-card:hover {
        transform: none;
    }

    .kai-article-card::after {
        display: none;
    }

    .kai-article-content pre {
        background: #f5f5f5;
        color: #333;
        border: 1px solid #ccc;
        font-size: 10pt;
    }

    .kai-article-content blockquote {
        border-left: 3px solid #666;
        background: #f9f9f9;
    }

    .kai-article-content table {
        border: 1px solid #333;
    }

    .kai-article-content th,
    .kai-article-content td {
        border: 1px solid #999;
    }

    .kai-article-content th {
        background: #eee;
    }

    .kai-article-content tr:nth-child(even) td {
        background: transparent;
    }

    .kai-article-content a {
        color: #000;
        text-decoration: underline;
    }

    a[href]::after {
        content: " (" attr(href) ")";
        font-size: 9pt;
        color: #555;
    }

    .kai-breadcrumb-link[href]::after,
    .kai-section-link[href]::after,
    .kai-nav-link[href]::after {
        content: none;
    }
}

/* ==================
   REDUCED MOTION
   ================== */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    .kai-wrap *,
    .kai-wrap *::before,
    .kai-wrap *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .kai-skeleton {
        animation: none !important;
        background: var(--kai-bg-tertiary);
    }

    .kai-ai-typing span {
        animation: none !important;
        opacity: 0.6;
    }

    .kai-back-top {
        transition: opacity 0.01ms !important;
        transform: none !important;
    }

    .kai-back-top.visible {
        transform: none !important;
    }
}

/* ==================
    PRODUCT SHOWCASE
    ================== */
.kai-products-showcase {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 28px;
    max-width: 960px;
    margin: 0 auto 48px;
}

.kai-product-showcase-card {
    background: var(--kai-surface);
    border: 1px solid var(--kai-border);
    border-radius: var(--kai-radius-lg);
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    color: var(--kai-text);
    display: flex;
    flex-direction: column;
    width: calc((100% - 56px) / 3);
    min-width: 280px;
}

@media (max-width: 960px) { .kai-product-showcase-card { width: calc((100% - 28px) / 2); min-width: 240px; } .kai-products-showcase { max-width: 620px; } }
@media (max-width: 600px) { .kai-product-showcase-card { width: 100%; min-width: unset; } .kai-products-showcase { max-width: 360px; } }

.kai-product-showcase-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.1), 0 4px 12px rgba(0,0,0,0.06);
    border-color: var(--product-color, var(--kai-primary));
    color: var(--kai-text);
}

.kai-product-showcase-image {
    position: relative;
    width: 100%;
    aspect-ratio: 4 / 3;
    overflow: hidden;
    background: var(--kai-bg-tertiary);
}

.kai-product-showcase-image img {
    width: 100% !important;
    height: 100% !important;
    object-fit: cover !important;
    display: block !important;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    z-index: 1;
}

.kai-product-showcase-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    color: rgba(255, 255, 255, 0.7);
}

.kai-product-showcase-card:hover .kai-product-showcase-image img {
    transform: scale(1.06);
}

.kai-product-showcase-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.35);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.kai-product-showcase-card:hover .kai-product-showcase-overlay {
    opacity: 1;
}

.kai-product-showcase-enter {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: white;
    color: var(--product-color, var(--kai-primary));
    display: flex;
    align-items: center;
    justify-content: center;
    transform: scale(0.6);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.kai-product-showcase-card:hover .kai-product-showcase-enter {
    transform: scale(1);
}

.kai-product-showcase-body {
    padding: 20px 22px 22px;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.kai-product-showcase-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 6px;
}

.kai-product-showcase-name {
    font-size: 17px;
    font-weight: 700;
    margin: 0;
    color: var(--kai-text);
    letter-spacing: -0.01em;
}

.kai-product-showcase-version {
    font-size: 11px;
    padding: 2px 8px;
    background: var(--kai-bg-tertiary);
    border-radius: 10px;
    color: var(--kai-text-muted);
    font-weight: 500;
    flex-shrink: 0;
}

.kai-product-showcase-desc {
    font-size: 13px;
    color: var(--kai-text-secondary);
    margin: 0 0 14px;
    line-height: 1.5;
    flex: 1;
}

.kai-product-showcase-cats {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    margin-bottom: 14px;
}

.kai-product-showcase-cats span {
    font-size: 11px;
    padding: 3px 10px;
    background: var(--kai-bg-tertiary);
    border-radius: 10px;
    color: var(--kai-text-secondary);
}

.kai-product-showcase-cats-more {
    background: color-mix(in srgb, var(--product-color, var(--kai-primary)) 8%, white);
    color: var(--product-color, var(--kai-primary));
}

.kai-product-showcase-footer {
    padding-top: 12px;
    border-top: 1px solid var(--kai-bg-tertiary);
}

.kai-product-showcase-count {
    font-size: 12px;
    color: var(--kai-text-muted);
    display: flex;
    align-items: center;
    gap: 5px;
}

/* ==================
    PRODUCT LAYOUT (SIDEBAR + MAIN)
    ================== */
.kai-product-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 40px;
    align-items: start;
}

@media (max-width: 900px) {
    .kai-product-layout {
        grid-template-columns: 1fr;
    }
}

.kai-product-sidebar {
    position: sticky;
    top: 24px;
    max-height: calc(100vh - 48px);
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--kai-border-hover) transparent;
}

.kai-product-sidebar::-webkit-scrollbar {
    width: 4px;
}

.kai-product-sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.kai-product-sidebar::-webkit-scrollbar-thumb {
    background: var(--kai-border-hover);
    border-radius: 2px;
}

.kai-product-sidebar-inner {
    display: flex;
    flex-direction: column;
    gap: 0;
}

/* ==================
    SIDEBAR BACK LINK
    ================== */
.kai-sidebar-back {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 14px;
    font-size: 13px;
    font-weight: 500;
    color: var(--kai-text-muted);
    border-radius: var(--kai-radius-sm);
    transition: all var(--kai-transition-fast) ease;
    text-decoration: none;
    margin-bottom: 4px;
}

.kai-sidebar-back:hover {
    color: var(--kai-primary);
    background: var(--kai-primary-light);
}

/* ==================
    SIDEBAR PRODUCT CARD
    ================== */
.kai-sidebar-product-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    background: var(--kai-surface);
    border: 1px solid var(--kai-border);
    border-radius: var(--kai-radius);
    margin-bottom: 8px;
    position: relative;
    overflow: hidden;
    text-decoration: none;
    transition: background 0.2s, box-shadow 0.2s;
}

.kai-sidebar-product-card:hover {
    background: var(--kai-bg-tertiary);
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.kai-sidebar-product-card:hover .kai-sidebar-product-name {
    color: var(--product-color, var(--kai-primary));
}

.kai-sidebar-product-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--product-color, var(--kai-primary));
    border-radius: 0 2px 2px 0;
}

.kai-sidebar-product-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--kai-radius-sm);
    background: linear-gradient(135deg, var(--product-color, var(--kai-primary)), color-mix(in srgb, var(--product-color, var(--kai-primary)) 75%, #000));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
}

.kai-sidebar-product-name {
    font-size: 15px;
    font-weight: 600;
    color: var(--kai-text);
    line-height: 1.3;
}

.kai-sidebar-product-version {
    display: inline-block;
    font-size: 11px;
    padding: 1px 8px;
    background: var(--kai-bg-tertiary);
    border-radius: 10px;
    color: var(--kai-text-muted);
    margin-left: 8px;
    vertical-align: middle;
}

/* ==================
    PRODUCT SWITCHER
    ================== */
.kai-sidebar-product-switcher {
    position: relative;
    padding: 4px 0;
}

.kai-product-switch-btn {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border: none;
    background: transparent;
    border-radius: var(--kai-radius-sm);
    font-size: 13px;
    color: var(--kai-text-muted);
    cursor: pointer;
    transition: all var(--kai-transition-fast) ease;
    font-family: var(--kai-font);
    text-align: left;
}

.kai-product-switch-btn:hover {
    color: var(--kai-text);
    background: var(--kai-bg-tertiary);
}

.kai-product-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--kai-surface);
    border: 1px solid var(--kai-border);
    border-radius: var(--kai-radius);
    box-shadow: var(--kai-shadow-xl);
    z-index: 200;
    overflow: hidden;
    animation: kai-dropdown-in 0.15s ease;
}

.kai-product-dropdown.open {
    display: block;
}

@keyframes kai-dropdown-in {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}

.kai-product-dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    font-size: 14px;
    color: var(--kai-text-secondary);
    text-decoration: none;
    transition: all var(--kai-transition-fast) ease;
}

.kai-product-dropdown-item:hover {
    background: var(--kai-primary-light);
    color: var(--kai-primary);
}

.kai-product-dropdown-item.active {
    background: var(--kai-primary-light);
    color: var(--kai-primary);
    font-weight: 500;
}

/* ==================
    PRODUCT HEADER
    ================== */
.kai-product-header {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 32px;
    background: var(--kai-surface);
    border: 1px solid var(--kai-border);
    border-radius: var(--kai-radius-lg);
    margin-bottom: 32px;
    position: relative;
    overflow: hidden;
}

.kai-product-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--product-color, var(--kai-primary));
}

.kai-product-header-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--kai-radius);
    background: linear-gradient(135deg, var(--product-color, var(--kai-primary)), color-mix(in srgb, var(--product-color, var(--kai-primary)) 70%, #000));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    flex-shrink: 0;
    box-shadow: 0 4px 16px color-mix(in srgb, var(--product-color, var(--kai-primary)) 25%, transparent);
}

.kai-product-header-info {
    flex: 1;
    min-width: 0;
}

.kai-product-header-title {
    font-size: 28px;
    font-weight: 800;
    color: var(--kai-text);
    margin: 0 0 4px;
    letter-spacing: -0.025em;
    line-height: 1.2;
}

.kai-product-header-version {
    display: inline-block;
    font-size: 12px;
    padding: 2px 10px;
    background: var(--kai-bg-tertiary);
    border-radius: 12px;
    color: var(--kai-text-muted);
    font-weight: 500;
    margin-bottom: 4px;
}

.kai-product-header-desc {
    font-size: 15px;
    color: var(--kai-text-secondary);
    margin: 8px 0 0;
    line-height: 1.5;
}

.kai-product-header-stats {
    display: flex;
    gap: 24px;
    flex-shrink: 0;
}

.kai-product-stat {
    text-align: center;
    padding: 12px 20px;
    background: var(--kai-bg-secondary);
    border-radius: var(--kai-radius);
}

.kai-product-stat-value {
    display: block;
    font-size: 24px;
    font-weight: 700;
    color: var(--kai-text);
    line-height: 1.2;
}

.kai-product-stat-label {
    font-size: 12px;
    color: var(--kai-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
}

/* ==================
    MOBILE PRODUCT SIDEBAR
    ================== */
@media (max-width: 900px) {
    .kai-product-sidebar {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        width: 85%;
        max-width: 320px;
        z-index: 1002;
        background: var(--kai-surface);
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        transform: translateX(-100%);
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: none;
        padding: 0;
        margin: 0;
    }

    .kai-product-sidebar.kai-mobile-open {
        transform: translateX(0);
        box-shadow: 4px 0 24px rgba(0, 0, 0, 0.15);
    }

    .kai-product-sidebar-inner {
        flex-direction: column;
        gap: 0;
        padding: 0 16px 16px;
    }

    .kai-sidebar-back {
        display: inline-flex;
    }

    .kai-sidebar-product-card {
        margin-bottom: 8px;
    }

    .kai-sidebar-section {
        display: block;
    }

    .kai-product-header {
        flex-direction: column;
        text-align: center;
        padding: 24px;
    }

    .kai-product-header-stats {
        justify-content: center;
    }

}

@media (max-width: 480px) {
    .kai-product-header-icon {
        width: 48px;
        height: 48px;
        font-size: 24px;
    }

    .kai-product-header-title {
        font-size: 22px;
    }

    .kai-product-stat-value {
        font-size: 20px;
    }

    .kai-product-header-stats {
        gap: 12px;
    }

    .kai-product-stat {
        padding: 8px 14px;
    }
}

/* ==================
    SIDEBAR SECTION OVERRIDES FOR PRODUCT SIDEBAR
    ================== */
.kai-product-sidebar .kai-sidebar-section {
    background: transparent;
    border: none;
    border-radius: 0;
    padding: 12px 0;
    margin-bottom: 0;
    border-bottom: 1px solid var(--kai-bg-tertiary);
}

.kai-product-sidebar .kai-sidebar-section:last-child {
    border-bottom: none;
}

.kai-product-sidebar .kai-sidebar-title {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--kai-text-muted);
    margin: 0 0 12px;
    padding-bottom: 8px;
    border-bottom: none;
}

.kai-product-sidebar .kai-related-link.active {
    color: var(--kai-primary);
    background: var(--kai-primary-light);
    font-weight: 500;
}

.kai-sidebar-mobile-toggle {
    display: none;
    width: 100%;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    border: 1px solid var(--kai-border);
    border-radius: var(--kai-radius-sm);
    background: var(--kai-surface);
    color: var(--kai-text-secondary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    font-family: var(--kai-font);
    transition: all var(--kai-transition-fast) ease;
    margin-bottom: 12px;
}

.kai-sidebar-mobile-toggle:hover {
    border-color: var(--kai-primary);
    color: var(--kai-primary);
}

.kai-sidebar-mobile-close {
    display: none;
    position: sticky;
    top: 0;
    width: 100%;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 12px 16px;
    border: none;
    border-bottom: 1px solid var(--kai-border);
    border-radius: 0;
    background: var(--kai-surface);
    color: var(--kai-text);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    font-family: var(--kai-font);
    z-index: 10;
}

.kai-sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(24, 24, 27, 0.4);
    z-index: 1001;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    animation: kai-fade-in 0.2s ease;
}

.kai-sidebar-backdrop.active {
    display: block;
}

@media (max-width: 900px) {
    .kai-sidebar-mobile-toggle {
        display: flex;
        position: fixed;
        bottom: 96px;
        left: 50%;
        transform: translateX(-50%);
        width: auto;
        z-index: 510;
        border-radius: 28px;
        padding: 10px 16px;
        box-shadow: var(--kai-shadow-lg);
        margin-bottom: 0;
    }

    .kai-sidebar-mobile-close {
        display: flex;
        position: sticky;
        top: 0;
        background: var(--kai-surface);
        z-index: 10;
    }
}

/* ==================
    COLOR-MIX FALLBACK
    ================== */
@supports not (color: color-mix(in srgb, red 50%, blue)) {
    .kai-product-card-icon {
        background: var(--product-color, var(--kai-primary));
        box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    }

    .kai-product-card:hover .kai-product-card-arrow {
        background: var(--product-color, var(--kai-primary));
    }

    .kai-product-header-icon {
        background: var(--product-color, var(--kai-primary));
        box-shadow: 0 4px 16px rgba(0,0,0,0.1);
    }

    .kai-sidebar-product-icon {
        background: var(--product-color, var(--kai-primary));
    }

    .kai-product-card:hover .kai-product-card-cat {
        background: var(--kai-primary-light);
        color: var(--kai-primary);
    }
}

/* ==================
    PRINT OVERRIDE FOR PRODUCT LAYOUT
    ================== */
@media print {
    .kai-product-sidebar {
        display: none !important;
    }

    .kai-product-layout {
        grid-template-columns: 1fr;
    }

    .kai-product-header {
        border: 1px solid #ccc;
        box-shadow: none;
        break-inside: avoid;
    }

    .kai-product-header::before {
        display: none;
    }

    .kai-product-header-icon {
        box-shadow: none;
        background: #f0f0f0;
    }
}

/* ==================
    SIDEBAR TREE NAVIGATION
    ================== */
.kai-sidebar-tree-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.kai-tree-collapse-all {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    border: none;
    background: transparent;
    color: var(--kai-text-muted);
    border-radius: var(--kai-radius-sm);
    cursor: pointer;
    transition: all var(--kai-transition-fast) ease;
    flex-shrink: 0;
}

.kai-tree-collapse-all:hover {
    color: var(--kai-primary);
    background: var(--kai-primary-light);
}

.kai-tree-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.kai-tree-children {
    list-style: none;
    padding: 0;
    margin: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
}

.kai-tree-item {
    display: block;
}

.kai-tree-node {
    display: flex;
    align-items: center;
    gap: 2px;
    min-height: 30px;
    border-radius: var(--kai-radius-sm);
    transition: background var(--kai-transition-fast) ease;
}

.kai-tree-node:hover {
    background: var(--kai-bg-tertiary);
}

.kai-tree-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    border: none;
    background: transparent;
    color: var(--kai-text-muted);
    border-radius: 4px;
    cursor: pointer;
    transition: all var(--kai-transition-fast) ease;
    flex-shrink: 0;
    padding: 0;
}

.kai-tree-toggle:hover {
    color: var(--kai-primary);
    background: var(--kai-primary-light);
}

.kai-tree-arrow {
    transition: transform 0.2s ease;
    flex-shrink: 0;
}

.kai-tree-toggle[aria-expanded="false"] .kai-tree-arrow {
    transform: rotate(-90deg);
}

.kai-tree-toggle[aria-expanded="false"] ~ .kai-tree-link {
}

.kai-tree-spacer {
    width: 22px;
    height: 22px;
    flex-shrink: 0;
}

.kai-tree-icon {
    font-size: 14px;
    line-height: 1;
    flex-shrink: 0;
    width: 18px;
    text-align: center;
}

.kai-tree-doc-icon {
    flex-shrink: 0;
    color: var(--kai-text-muted);
    opacity: 0.6;
}

.kai-tree-article .kai-tree-node {
    gap: 2px;
}

.kai-tree-link {
    display: flex;
    align-items: center;
    padding: 3px 6px;
    font-size: 13px;
    line-height: 1.4;
    color: var(--kai-text-secondary);
    text-decoration: none;
    border-radius: 4px;
    transition: all var(--kai-transition-fast) ease;
    flex: 1;
    min-width: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.kai-tree-link:hover {
    color: var(--kai-text);
}

.kai-tree-link.active {
    color: var(--kai-primary);
    font-weight: 600;
    background: var(--kai-primary-light);
}

.kai-tree-article-link {
    font-size: 12.5px;
}

.kai-tree-children .kai-tree-children .kai-tree-link {
    font-size: 12.5px;
}

.kai-tree-item[data-depth="1"] > .kai-tree-node { padding-left: 4px; }
.kai-tree-item[data-depth="2"] > .kai-tree-node { padding-left: 12px; }
.kai-tree-item[data-depth="3"] > .kai-tree-node { padding-left: 20px; }
.kai-tree-item[data-depth="4"] > .kai-tree-node { padding-left: 28px; }

.kai-tree-item[data-depth="1"] > .kai-tree-node .kai-tree-spacer { width: 18px; }
.kai-tree-item[data-depth="2"] > .kai-tree-node .kai-tree-spacer { width: 14px; }
.kai-tree-item[data-depth="3"] > .kai-tree-node .kai-tree-spacer { width: 10px; }
.kai-tree-item[data-depth="4"] > .kai-tree-node .kai-tree-spacer { width: 6px; }

.kai-tree-children.kai-tree-collapsed {
}

.kai-tree-active > .kai-tree-node .kai-tree-link:not(.active) {
    color: var(--kai-text);
    font-weight: 500;
}

/* ==================
   ARTICLE TRANSLATION
   ================== */
.kai-translate-wrap {
    position: relative;
    display: inline-flex;
    align-items: center;
    vertical-align: middle;
}

.kai-translate-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    border: 1px solid var(--kai-border);
    border-radius: 20px;
    background: var(--kai-surface);
    color: var(--kai-text-secondary);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--kai-font);
    line-height: 1.4;
    white-space: nowrap;
    user-select: none;
    box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}

.kai-translate-btn:hover {
    border-color: var(--kai-primary);
    color: var(--kai-primary);
    background: var(--kai-primary-light);
    box-shadow: 0 2px 8px rgba(var(--kai-primary-rgb), 0.12);
}

.kai-translate-btn svg {
    flex-shrink: 0;
}

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

.kai-translate-btn .kai-translate-chevron {
    width: 12px;
    height: 12px;
    opacity: 0.5;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.kai-translate-btn[aria-expanded="true"] .kai-translate-chevron {
    transform: rotate(180deg);
    opacity: 1;
}

.kai-translate-btn .kai-translate-spinner {
    display: none;
    width: 14px;
    height: 14px;
    border: 2px solid rgba(var(--kai-primary-rgb), 0.2);
    border-top-color: var(--kai-primary);
    border-radius: 50%;
    animation: kai-translate-spin 0.6s linear infinite;
}

.kai-translate-btn.kai-translating {
    pointer-events: none;
    border-color: var(--kai-primary);
    color: var(--kai-primary);
    background: var(--kai-primary-light);
    padding-left: 10px;
}

.kai-translate-btn.kai-translating .kai-translate-spinner {
    display: inline-block;
}

.kai-translate-btn.kai-translating .kai-translate-icon {
    display: none;
}

.kai-translate-btn.kai-translating .kai-translate-chevron {
    display: none;
}

.kai-translate-btn.kai-translate-active {
    background: var(--kai-primary);
    border-color: var(--kai-primary);
    color: white;
    box-shadow: 0 2px 8px rgba(var(--kai-primary-rgb), 0.3);
}

.kai-translate-btn.kai-translate-active:hover {
    background: var(--kai-primary-hover);
    border-color: var(--kai-primary-hover);
    color: white;
    box-shadow: 0 4px 12px rgba(var(--kai-primary-rgb), 0.35);
}

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

.kai-translate-dropdown {
    position: absolute;
    top: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%) scale(0.95);
    background: var(--kai-surface);
    border: 1px solid var(--kai-border);
    border-radius: var(--kai-radius);
    box-shadow: var(--kai-shadow-xl);
    z-index: 100;
    min-width: 180px;
    max-height: 300px;
    overflow-y: auto;
    padding: 6px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.15s ease, transform 0.15s ease, visibility 0.15s ease;
    scrollbar-width: thin;
}

.kai-translate-dropdown.active {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) scale(1);
}

.kai-translate-dropdown-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    font-size: 13px;
    color: var(--kai-text-secondary);
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.15s ease;
    font-family: var(--kai-font);
}

.kai-translate-dropdown-item:hover {
    background: var(--kai-primary-light);
    color: var(--kai-primary);
}

.kai-translate-dropdown-item.active-lang {
    background: var(--kai-primary);
    color: white;
    font-weight: 500;
}

.kai-translate-dropdown-item.active-lang:hover {
    background: var(--kai-primary-hover);
    color: white;
}

/* Translation overlay on article content */
.kai-article-content.kai-translating-content {
    position: relative;
    min-height: 100px;
}

.kai-article-content.kai-translating-content::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    z-index: 5;
    border-radius: var(--kai-radius-sm);
}

.kai-translate-loading-bar {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 6;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: var(--kai-primary);
    font-size: 14px;
    font-weight: 500;
}

.kai-translate-loading-bar .kai-translate-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--kai-border);
    border-top-color: var(--kai-primary);
    border-radius: 50%;
    animation: kai-translate-spin 0.6s linear infinite;
}

/* Translation notification */
.kai-translate-restored {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: var(--kai-radius-sm);
    font-size: 13px;
    margin-bottom: 16px;
    animation: kai-translate-notice-in 0.3s ease;
}

.kai-translate-restored svg {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
}

@keyframes kai-translate-notice-in {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
    .kai-translate-dropdown {
        min-width: 160px;
        max-height: 250px;
        left: 0;
        transform: translateX(0) scale(0.95);
    }
    .kai-translate-dropdown.active {
        transform: translateX(0) scale(1);
    }
}

@media print {
    .kai-translate-wrap {
        display: none !important;
    }
}