/* ========================================
   昂景生物 | Ongene Biotech — 知识库前台样式
   主色：#E87722（昂景橙）| 辅色：#1A6B7A（深蓝绿）
   深色：#0B1420 | 背景：#F7F8FA
   ======================================== */

/* ===== CSS Variables ===== */
:root {
  --color-primary: #E87722;
  --color-primary-hover: #C85D15;
  --color-primary-dark: #C85D15;
  --color-primary-light: #F5A055;
  --color-primary-bg: rgba(232, 119, 34, 0.06);
  --color-primary-border: rgba(232, 119, 34, 0.2);
  --color-accent: #1A6B7A;
  --color-accent-light: #2A8FA0;
  --color-accent-bg: rgba(26, 107, 122, 0.06);
  --color-dark: #0B1420;
  --color-dark-secondary: #1A2332;
  --color-bg: #FFFFFF;
  --color-bg-light: #F0F4F8;
  --color-bg-alt: #F8F9FB;
  --color-bg-warm: #FEFAF6;
  --color-surface: #FFFFFF;
  --color-text: #111827;
  --color-text-secondary: #374151;
  --color-text-muted: #6B7280;
  --color-text-light: #9CA3AF;
  --color-border: #E5E7EB;
  --color-border-light: #F0F1F3;
  --color-success: #10B981;
  --color-success-bg: #ECFDF5;
  --color-error: #DC2626;
  --color-error-bg: #FEF2F2;
  --color-warning: #F59E0B;
  --color-warning-bg: #FFFBEB;
  --color-info: #1890FF;
  --color-info-bg: #EFF6FF;

  --font-sans: "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Consolas", monospace;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.08);
  --shadow-xl: 0 16px 48px rgba(0,0,0,0.12);

  --glow-orange-sm: 0 0 8px rgba(232,119,34,0.10);
  --glow-orange-md: 0 0 20px rgba(232,119,34,0.14), 0 4px 12px rgba(232,119,34,0.08);
  --glow-teal-sm: 0 0 8px rgba(26,107,122,0.10);
  --glow-teal-md: 0 0 20px rgba(26,107,122,0.14), 0 4px 12px rgba(26,107,122,0.06);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --transition-fast: 0.15s ease;
  --transition: 0.25s ease;
  --transition-slow: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { font-size: 16px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

img { max-width: 100%; height: auto; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

main { flex: 1; }

/* ===== Header ===== */
.kb-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.85); backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}
.kb-header.scrolled { box-shadow: var(--shadow-md); }

.kb-header .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}

/* Logo */
.kb-logo { display: flex; align-items: center; gap: 10px; color: var(--color-text); text-decoration: none; flex-shrink: 0; }
.kb-logo-icon img { height: 34px; width: 34px; border-radius: var(--radius-sm); }
.kb-logo-text { display: flex; flex-direction: column; line-height: 1.2; }
.kb-logo-name { font-size: 17px; font-weight: 700; color: var(--color-dark); }
.kb-logo-slogan { font-size: 11px; color: var(--color-text-muted); }

/* Nav */
.kb-nav { display: flex; align-items: center; gap: 6px; }
.kb-nav a {
  padding: 8px 16px; border-radius: var(--radius-md); font-size: 14px; font-weight: 500;
  color: var(--color-text-secondary); transition: all var(--transition-fast);
}
.kb-nav a:hover { background: var(--color-bg); color: var(--color-text); }
.kb-nav a.active { color: var(--color-primary); background: var(--color-primary-bg); }

/* Header search */
.kb-header-search { display: flex; align-items: center; gap: 0; margin-left: 8px; }
.kb-search-input-sm {
  width: 180px; padding: 8px 14px; border: 1.5px solid var(--color-border);
  border-right: none; border-radius: var(--radius-full) 0 0 var(--radius-full);
  font-size: 13px; outline: none; background: var(--color-bg);
  transition: border-color var(--transition-fast), width var(--transition);
}
.kb-search-input-sm:focus { border-color: var(--color-primary); width: 220px; }

.kb-search-btn-sm {
  padding: 8px 16px; background: var(--color-primary); color: #fff; border: none;
  border-radius: 0 var(--radius-full) var(--radius-full) 0;
  font-size: 13px; cursor: pointer; white-space: nowrap;
  transition: background var(--transition-fast);
}
.kb-search-btn-sm:hover { background: var(--color-primary-hover); }

/* Mobile search (hidden on desktop) */
.kb-mobile-search { display: none; }

/* Hamburger */
.kb-mobile-menu-btn {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 8px; z-index: 101;
}
.kb-mobile-menu-btn span {
  display: block; width: 22px; height: 2px; border-radius: 2px;
  background: var(--color-text); transition: transform var(--transition), opacity var(--transition);
}
.kb-mobile-menu-btn.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.kb-mobile-menu-btn.active span:nth-child(2) { opacity: 0; }
.kb-mobile-menu-btn.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Hero ===== */
.kb-hero {
  position: relative;
  text-align: center; padding: 80px 24px 64px;
  background: linear-gradient(170deg, #F2F5F8 0%, #F8FAFB 35%, #FFFFFF 100%);
  overflow: hidden;
}
.kb-hero::before {
  content: '';
  position: absolute; top: -30%; right: -10%;
  width: 360px; height: 360px;
  background: radial-gradient(circle, rgba(26,107,122,0.05) 0%, transparent 65%);
  border-radius: 50%; z-index: 0; pointer-events: none;
}
.kb-hero::after {
  content: '';
  position: absolute; inset: 0;
  background-image: radial-gradient(rgba(0,0,0,0.03) 1px, transparent 1px);
  background-size: 28px 28px; z-index: 0;
  opacity: 0.5; pointer-events: none;
}
.kb-hero h1 { font-size: 36px; font-weight: 800; color: var(--color-dark); margin-bottom: 12px; letter-spacing: -0.5px; position: relative; z-index: 1; }
.kb-hero p { font-size: 17px; color: var(--color-text-secondary); margin-bottom: 36px; position: relative; z-index: 1; }
.kb-hero form,
.kb-hero .kb-search-form,
.kb-hero .kb-hot-tags { position: relative; z-index: 1; }

/* KB hero floating particles */
.kb-hero-particles { position: absolute; inset: 0; z-index: 0; pointer-events: none; overflow: hidden; }
.kb-hero-particle { position: absolute; width: 2px; height: 2px; background: rgba(26,107,122,0.10); border-radius: 50%; animation: kbParticleFloat 8s infinite ease-in-out; }
.kb-hero-particle:nth-child(1) { left: 12%; top: 35%; animation-delay: 0s; }
.kb-hero-particle:nth-child(2) { left: 88%; top: 18%; animation-delay: 2.5s; }
.kb-hero-particle:nth-child(3) { left: 50%; top: 58%; animation-delay: 4.5s; }
.kb-hero-particle:nth-child(4) { left: 72%; top: 40%; animation-delay: 1.2s; }
@keyframes kbParticleFloat { 0%, 100% { transform: translateY(0); opacity: 0.7; } 50% { transform: translateY(-18px); opacity: 0.2; } }

.kb-hero-sm {
  position: relative;
  text-align: center; padding: 32px 24px;
  background: linear-gradient(170deg, #F2F5F8 0%, #FFFFFF 100%);
  overflow: hidden;
}
.kb-hero-sm::after {
  content: '';
  position: absolute; inset: 0;
  background-image: radial-gradient(rgba(0,0,0,0.02) 1px, transparent 1px);
  background-size: 24px 24px;
  z-index: 0; opacity: 0.4; pointer-events: none;
}
.kb-hero-sm h1,
.kb-hero-sm p { position: relative; z-index: 1; }

/* Search form */
.kb-search-form {
  display: flex; max-width: 640px; margin: 0 auto;
  box-shadow: var(--shadow-lg); border-radius: var(--radius-full); overflow: hidden;
}
.kb-search-input {
  flex: 1; padding: 16px 24px; border: 2px solid transparent;
  font-size: 16px; outline: none; border-radius: var(--radius-full) 0 0 var(--radius-full);
  transition: border-color var(--transition-fast);
}
.kb-search-input:focus { border-color: var(--color-primary); }
.kb-search-btn {
  padding: 16px 36px; background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
  color: #fff; border: none; font-size: 16px; font-weight: 600; cursor: pointer;
  border-radius: 0 var(--radius-full) var(--radius-full) 0;
  transition: opacity var(--transition-fast);
}
.kb-search-btn:hover { opacity: 0.92; }

/* Hot tags */
.kb-hot-tags { margin-top: 24px; display: flex; justify-content: center; flex-wrap: wrap; gap: 8px; }
.kb-hot-tag {
  padding: 6px 16px; background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-full); font-size: 13px; color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}
.kb-hot-tag:hover { border-color: var(--color-primary); color: var(--color-primary); background: var(--color-primary-bg); }

/* ===== Sections ===== */
.kb-section { padding: 56px 24px; }
.kb-section-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 28px; max-width: 1200px; margin-left: auto; margin-right: auto;
}
.kb-section-header h2 { font-size: 22px; font-weight: 700; color: var(--color-dark); }
.kb-section-more { font-size: 14px; color: var(--color-primary); font-weight: 500; }
.kb-section-more:hover { text-decoration: underline; }

.kb-section-header-center { text-align: center; margin-bottom: 32px; }
.kb-section-badge { display: inline-block; padding: 4px 14px; background: var(--color-primary-bg); color: var(--color-primary); border-radius: var(--radius-full); font-size: 13px; font-weight: 600; margin-bottom: 12px; }
.kb-section-title { font-size: 28px; font-weight: 800; color: var(--color-dark); margin-bottom: 8px; }
.kb-section-subtitle { font-size: 15px; color: var(--color-text-muted); }

/* ===== Category Cards ===== */
.kb-cat-cards {
  max-width: 1200px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 16px;
}
.kb-cat-card {
  position: relative;
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  padding: 28px 16px; background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); text-align: center; overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.kb-cat-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light), var(--color-accent));
  opacity: 0; transition: opacity var(--transition-slow);
}
.kb-cat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--glow-teal-sm);
  border-color: var(--color-primary-border);
}
.kb-cat-card:hover::before { opacity: 1; }
.kb-cat-card-icon { font-size: 36px; width: 64px; height: 64px; display: flex; align-items: center; justify-content: center; border-radius: var(--radius-md); }
.kb-cat-card:nth-child(6n+1) .kb-cat-card-icon { background: rgba(232,119,34,0.1); }
.kb-cat-card:nth-child(6n+2) .kb-cat-card-icon { background: rgba(26,107,122,0.1); }
.kb-cat-card:nth-child(6n+3) .kb-cat-card-icon { background: rgba(16,185,129,0.1); }
.kb-cat-card:nth-child(6n+4) .kb-cat-card-icon { background: rgba(59,130,246,0.1); }
.kb-cat-card:nth-child(6n+5) .kb-cat-card-icon { background: rgba(245,158,11,0.1); }
.kb-cat-card:nth-child(6n+6) .kb-cat-card-icon { background: rgba(139,92,246,0.1); }
.kb-cat-card-name { font-size: 15px; font-weight: 600; color: var(--color-text); }
.kb-cat-card-count { font-size: 12px; color: var(--color-text-muted); }

/* ===== Grid Layout (search, category) ===== */
.kb-grid { max-width: 1200px; margin: 0 auto; padding: 32px 24px; display: grid; grid-template-columns: 220px 1fr; gap: 32px; }
.kb-aside { position: sticky; top: 80px; align-self: start; }
.kb-aside h3 { font-size: 14px; font-weight: 600; color: var(--color-text-secondary); margin-bottom: 12px; text-transform: uppercase; letter-spacing: 0.5px; }
.kb-content { min-width: 0; }
.kb-content > h2 { font-size: 20px; font-weight: 700; margin-bottom: 20px; color: var(--color-dark); }

/* Category list sidebar */
.kb-cat-list { list-style: none; }
.kb-cat-list li { margin-bottom: 2px; }
.kb-cat-list a {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 12px; border-radius: var(--radius-sm); font-size: 14px;
  color: var(--color-text-secondary); transition: all var(--transition-fast);
}
.kb-cat-list a:hover { background: var(--color-bg); color: var(--color-text); }
.kb-cat-list a.active { background: var(--color-primary-bg); color: var(--color-primary); font-weight: 600; }
.kb-badge { font-size: 11px; padding: 1px 8px; background: var(--color-bg); border-radius: var(--radius-full); color: var(--color-text-muted); }
.kb-cat-list a.active .kb-badge { background: rgba(232,119,34,0.15); color: var(--color-primary); }

/* Sub-category chips */
.kb-subcats { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; }
.kb-subcat-card {
  padding: 6px 16px; border: 1px solid var(--color-border); border-radius: var(--radius-full);
  font-size: 13px; color: var(--color-text-secondary); transition: all var(--transition-fast);
}
.kb-subcat-card:hover { border-color: var(--color-primary); color: var(--color-primary); background: var(--color-primary-bg); }

/* ===== Article List ===== */
.kb-article-list { display: flex; flex-direction: column; gap: 12px; }
.kb-article-card {
  display: block; padding: 20px 24px; background: var(--color-surface);
  border: 1px solid var(--color-border); border-radius: var(--radius-md);
  transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
  color: var(--color-text);
}
.kb-article-card:hover { transform: translateY(-2px); box-shadow: var(--glow-teal-sm); border-color: var(--color-primary-border); }
.kb-article-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 8px; color: var(--color-text); }
.kb-article-card .kb-excerpt { font-size: 13px; color: var(--color-text-muted); margin-bottom: 10px; line-height: 1.5; }

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

/* ===== Tags ===== */
.kb-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.kb-tag {
  padding: 2px 10px; background: var(--color-bg); border-radius: var(--radius-full);
  font-size: 12px; color: var(--color-text-secondary);
}

/* ===== Article Detail ===== */
.kb-article { padding: 32px 24px 56px; }
.kb-article .container { max-width: 820px; }

.kb-breadcrumb {
  display: flex; align-items: center; gap: 6px; flex-wrap: wrap;
  font-size: 13px; color: var(--color-text-muted); margin-bottom: 24px;
}
.kb-breadcrumb a { color: var(--color-text-secondary); }
.kb-breadcrumb a:hover { color: var(--color-primary); }
.kb-breadcrumb span { color: var(--color-text-muted); }

.kb-article-header { margin-bottom: 32px; }
.kb-article-header h1 { font-size: 30px; font-weight: 800; color: var(--color-dark); margin-bottom: 16px; line-height: 1.3; letter-spacing: -0.3px; }
.kb-article-header .kb-meta { margin-bottom: 12px; }
.kb-article-header .kb-tags { margin-top: 0; }

.kb-article-body {
  font-size: 16px; line-height: 1.85; color: var(--color-text);
}
.kb-article-body h2 { font-size: 22px; font-weight: 700; margin: 36px 0 16px; color: var(--color-dark); }
.kb-article-body h3 { font-size: 18px; font-weight: 600; margin: 28px 0 12px; color: var(--color-dark-secondary); }
.kb-article-body p { margin-bottom: 16px; }
.kb-article-body ul, .kb-article-body ol { margin: 12px 0 20px; padding-left: 24px; }
.kb-article-body li { margin-bottom: 6px; }
.kb-article-body table { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 14px; }
.kb-article-body th, .kb-article-body td { border: 1px solid var(--color-border); padding: 10px 14px; text-align: left; }
.kb-article-body th { background: var(--color-bg); font-weight: 600; color: var(--color-text-secondary); }

@media (max-width: 768px) {
  .kb-article-body { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .kb-article-body table { min-width: 600px; }
}

.kb-article-body blockquote {
  border-left: 4px solid var(--color-primary); padding: 12px 20px; margin: 20px 0;
  background: var(--color-primary-bg); color: var(--color-text-secondary); border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.kb-article-body img { max-width: 100%; height: auto; border-radius: var(--radius-md); margin: 16px 0; }
.kb-article-body strong { color: var(--color-dark); }
.kb-article-body code { padding: 2px 6px; background: var(--color-bg); border-radius: 4px; font-family: var(--font-mono); font-size: 0.9em; }
.kb-article-body pre { background: var(--color-dark); color: #E5E7EB; padding: 20px; border-radius: var(--radius-md); overflow-x: auto; margin: 16px 0; font-size: 14px; line-height: 1.6; }
.kb-article-body pre code { background: none; padding: 0; color: inherit; }

/* ===== Feedback ===== */
.kb-feedback {
  margin-top: 48px; padding: 24px; text-align: center;
  background: var(--color-bg); border-radius: var(--radius-lg); border: 1px solid var(--color-border);
}
.kb-feedback p { font-size: 15px; color: var(--color-text-secondary); margin-bottom: 12px; }
.kb-btn-helpful, .kb-btn-not-helpful {
  padding: 8px 24px; border: 1.5px solid var(--color-border); border-radius: var(--radius-full);
  font-size: 14px; cursor: pointer; background: var(--color-surface);
  transition: all var(--transition-fast); margin: 4px;
}
.kb-btn-helpful:hover { border-color: var(--color-success); background: var(--color-success-bg); color: var(--color-success); }
.kb-btn-not-helpful:hover { border-color: var(--color-error); background: var(--color-error-bg); color: var(--color-error); }

/* ===== Related Content ===== */
.kb-related {
  margin-top: 32px; padding: 24px; background: var(--color-surface);
  border: 1px solid var(--color-border); border-radius: var(--radius-lg);
}
.kb-related h3 { font-size: 16px; font-weight: 600; margin-bottom: 12px; color: var(--color-dark); }
.kb-related ul { list-style: none; }
.kb-related li { padding: 6px 0; }
.kb-related a { font-size: 14px; color: var(--color-text-secondary); }
.kb-related a:hover { color: var(--color-primary); }

/* ===== Detail Sidebar CTA ===== */
.kb-detail-sidebar {
  margin-top: 32px; padding: 24px; background: linear-gradient(135deg, var(--color-primary-bg), var(--color-accent-bg));
  border-radius: var(--radius-lg); border: 1px solid var(--color-primary-border);
}
.kb-detail-sidebar h4 { font-size: 15px; font-weight: 600; margin-bottom: 8px; color: var(--color-dark); }
.kb-detail-sidebar p { font-size: 13px; color: var(--color-text-secondary); margin-bottom: 6px; }
.kb-detail-sidebar .kb-sidebar-muted { font-size: 12px; color: var(--color-text-muted); }
.kb-detail-sidebar a { display: inline-block; margin-top: 12px; padding: 8px 20px; background: var(--color-primary); color: #fff; border-radius: var(--radius-full); font-size: 14px; font-weight: 500; }
.kb-detail-sidebar a:hover { background: var(--color-primary-hover); color: #fff; }

/* ===== FAQ ===== */
.kb-faq-page { max-width: 900px; margin: 0 auto; padding: 32px 24px 56px; }
.kb-faq-page > h1 { font-size: 28px; font-weight: 800; margin-bottom: 28px; color: var(--color-dark); }

.kb-faq-tabs { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 28px; }
.kb-faq-tab {
  padding: 8px 18px; border: 1px solid var(--color-border); border-radius: var(--radius-full);
  font-size: 13px; color: var(--color-text-secondary); transition: all var(--transition-fast);
}
.kb-faq-tab:hover { border-color: var(--color-primary); color: var(--color-primary); }
.kb-faq-tab.active { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }

.kb-faq-cat-heading { font-size: 16px; font-weight: 600; color: var(--color-dark); margin: 28px 0 12px; padding-bottom: 8px; border-bottom: 1px solid var(--color-border); }

/* FAQ Accordion */
.kb-faq-item {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-md); margin-bottom: 8px; overflow: hidden;
  transition: box-shadow var(--transition);
}
.kb-faq-item:hover { border-color: var(--color-primary-border); box-shadow: var(--glow-orange-sm); }

.kb-faq-question {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px; cursor: pointer; font-size: 15px; font-weight: 500;
  color: var(--color-text); user-select: none;
  transition: background var(--transition-fast);
}
.kb-faq-question:hover { background: var(--color-bg); }

.kb-faq-arrow { font-size: 11px; color: var(--color-text-muted); transition: transform var(--transition-slow); flex-shrink: 0; margin-left: 12px; }

.kb-faq-answer { max-height: 0; overflow: hidden; transition: max-height var(--transition-slow); }
.kb-faq-answer-inner { padding: 0 20px 20px; font-size: 14px; line-height: 1.8; color: var(--color-text-secondary); }

.kb-faq-item.open .kb-faq-answer { max-height: 2000px; }
.kb-faq-item.open .kb-faq-arrow { transform: rotate(180deg); }

/* FAQ feedback inline */
.kb-faq-feedback { margin-top: 16px; padding-top: 12px; border-top: 1px solid var(--color-border-light); font-size: 13px; color: var(--color-text-muted); display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.kb-faq-feedback button {
  padding: 4px 14px; border: 1px solid var(--color-border); border-radius: var(--radius-full);
  font-size: 12px; cursor: pointer; background: var(--color-surface);
  transition: all var(--transition-fast);
}
.kb-faq-feedback button:hover { border-color: var(--color-primary); color: var(--color-primary); }
.kb-faq-detail-link { font-size: 12px; color: var(--color-primary); margin-left: auto; }

/* ===== Contact Page ===== */
.kb-contact-page { max-width: 1000px; margin: 0 auto; padding: 32px 24px 56px; }
.kb-contact-page > h1 { font-size: 28px; font-weight: 800; margin-bottom: 8px; color: var(--color-dark); text-align: center; }
.kb-contact-subtitle { text-align: center; color: var(--color-text-muted); margin-bottom: 40px; font-size: 15px; }

.kb-contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }

.kb-contact-info h2, .kb-contact-form h2 { font-size: 18px; font-weight: 700; margin-bottom: 20px; color: var(--color-dark); }

.kb-contact-item { display: flex; gap: 14px; padding: 16px 0; border-bottom: 1px solid var(--color-border-light); align-items: flex-start; }
.kb-contact-icon { font-size: 24px; width: 44px; height: 44px; display: flex; align-items: center; justify-content: center; background: var(--color-bg); border-radius: var(--radius-md); flex-shrink: 0; }
.kb-contact-label { font-size: 12px; color: var(--color-text-muted); margin-bottom: 2px; text-transform: uppercase; letter-spacing: 0.5px; }
.kb-contact-value { font-size: 15px; font-weight: 500; color: var(--color-text); }

.kb-contact-hours { margin-top: 20px; padding: 16px; background: var(--color-bg); border-radius: var(--radius-md); }
.kb-contact-hours h3 { font-size: 14px; font-weight: 600; margin-bottom: 6px; }
.kb-contact-hours p { font-size: 13px; color: var(--color-text-secondary); }

/* Contact form */
.kb-form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.kb-form-group { margin-bottom: 18px; }
.kb-form-group label { display: block; font-size: 13px; font-weight: 500; color: var(--color-text-secondary); margin-bottom: 6px; }
.kb-form-group .required { color: var(--color-error); }

.kb-form-input, .kb-form-textarea {
  width: 100%; padding: 10px 14px; border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md); font-size: 14px; font-family: var(--font-sans);
  outline: none; background: var(--color-surface);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.kb-form-input:focus, .kb-form-textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(232,119,34,0.1);
}
.kb-form-textarea { resize: vertical; min-height: 120px; }

.kb-form-submit {
  width: 100%; padding: 14px; background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
  color: #fff; border: none; border-radius: var(--radius-md); font-size: 16px; font-weight: 600;
  cursor: pointer; transition: opacity var(--transition-fast);
}
.kb-form-submit:hover { opacity: 0.92; }

.kb-form-success { padding: 14px; background: var(--color-success-bg); color: var(--color-success); border-radius: var(--radius-md); font-size: 14px; margin-bottom: 20px; }
.kb-form-error { padding: 14px; background: var(--color-error-bg); color: var(--color-error); border-radius: var(--radius-md); font-size: 14px; margin-bottom: 20px; }

/* ===== Search Page ===== */
.kb-ai-recommend {
  margin-bottom: 28px; padding: 20px 24px; background: linear-gradient(135deg, var(--color-accent-bg), rgba(232,119,34,0.03));
  border: 1.5px solid rgba(26,107,122,0.2); border-radius: var(--radius-lg);
}
.kb-ai-recommend-header { display: flex; align-items: center; gap: 8px; margin-bottom: 14px; font-size: 15px; color: var(--color-accent); }
.kb-ai-recommend-header .hint { font-size: 12px; color: var(--color-text-muted); font-weight: 400; }
.kb-ai-recommend-item {
  display: flex; align-items: center; gap: 10px; padding: 10px 14px;
  border-radius: var(--radius-md); font-size: 14px; color: var(--color-text);
  transition: background var(--transition-fast);
}
.kb-ai-recommend-item:hover { background: rgba(255,255,255,0.7); }
.kb-ai-recommend-item .type-icon { font-size: 16px; }
.kb-ai-recommend-item .match { margin-left: auto; font-size: 12px; color: var(--color-accent); font-weight: 600; }

/* Keyword highlight */
mark.kb-highlight { background: rgba(232,119,34,0.2); color: var(--color-primary-hover); padding: 1px 4px; border-radius: 2px; }

/* ===== AI Chat (full page) ===== */
.kb-chat-page { max-width: 800px; margin: 0 auto; padding: 24px; display: flex; flex-direction: column; height: calc(100vh - 64px); }
.kb-chat-page .kb-chat-messages { flex: 1; overflow-y: auto; padding: 16px 0; display: flex; flex-direction: column; gap: 12px; }
.kb-chat-page .kb-chat-input-area { display: flex; gap: 8px; padding: 16px 0 0; border-top: 1px solid var(--color-border); }

/* ===== Chat Widget (floating) ===== */
.kb-chat-widget { position: fixed; bottom: 24px; right: 24px; z-index: 9999; font-family: var(--font-sans); }

.kb-chat-toggle {
  width: 56px; height: 56px; border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
  color: #fff; border: none; cursor: pointer; font-size: 24px;
  box-shadow: 0 4px 20px rgba(232,119,34,0.4);
  display: flex; align-items: center; justify-content: center;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.kb-chat-toggle:hover { transform: scale(1.08); box-shadow: 0 6px 24px rgba(232,119,34,0.5); }
.kb-chat-toggle .badge {
  position: absolute; top: -2px; right: -2px; width: 14px; height: 14px;
  border-radius: 50%; background: var(--color-error); border: 2px solid #fff; display: none;
}

.kb-chat-panel {
  position: absolute; bottom: 72px; right: 0; width: 380px; max-height: 560px;
  border-radius: var(--radius-lg); background: var(--color-surface);
  box-shadow: var(--shadow-xl); display: flex; flex-direction: column; overflow: hidden;
  transform: scale(0.9); opacity: 0; pointer-events: none;
  transition: transform var(--transition-slow), opacity var(--transition);
}
.kb-chat-panel.open { transform: scale(1); opacity: 1; pointer-events: auto; }

.kb-chat-header {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
  color: #fff; padding: 16px 20px; position: relative;
}
.kb-chat-header h3 { font-size: 15px; font-weight: 600; margin: 0 0 4px; display: flex; align-items: center; gap: 8px; }
.kb-chat-header p { font-size: 12px; opacity: 0.85; margin: 0; }
.kb-chat-header .close-btn {
  position: absolute; top: 12px; right: 14px; background: rgba(255,255,255,0.2); border: none;
  color: #fff; width: 28px; height: 28px; border-radius: 50%; cursor: pointer;
  font-size: 16px; display: flex; align-items: center; justify-content: center;
}

.kb-chat-messages { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 12px; background: var(--color-bg); }

.kb-chat-msg { max-width: 85%; padding: 10px 14px; border-radius: 12px; font-size: 13.5px; line-height: 1.6; word-break: break-word; }
.kb-chat-msg.user { align-self: flex-end; background: var(--color-primary); color: #fff; border-bottom-right-radius: 4px; }
.kb-chat-msg.bot { align-self: flex-start; background: var(--color-surface); color: var(--color-text); border: 1px solid var(--color-border); border-bottom-left-radius: 4px; }
.kb-chat-msg.bot .sources { margin-top: 8px; padding-top: 8px; border-top: 1px solid var(--color-border-light); }
.kb-chat-msg.bot .source-tag {
  display: inline-block; margin: 2px 4px 2px 0; padding: 2px 8px;
  background: var(--color-primary-bg); color: var(--color-primary);
  border-radius: 10px; font-size: 11px; text-decoration: none; cursor: pointer;
}
.kb-chat-msg.bot .source-tag:hover { background: rgba(232,119,34,0.18); }

.kb-chat-welcome { text-align: center; padding: 24px 16px; color: var(--color-text-muted); font-size: 13px; line-height: 1.6; }
.kb-chat-welcome .welcome-icon { font-size: 32px; margin-bottom: 8px; }

/* Thinking dots */
.kb-chat-msg .thinking { display: flex; align-items: center; gap: 4px; color: var(--color-text-muted); font-size: 12px; }
.kb-chat-msg .thinking span { animation: kbChatDots 1.4s infinite; }
.kb-chat-msg .thinking span:nth-child(2) { animation-delay: 0.2s; }
.kb-chat-msg .thinking span:nth-child(3) { animation-delay: 0.4s; }
@keyframes kbChatDots { 0%,60%,100% { opacity: 0.3; } 30% { opacity: 1; } }

.kb-chat-input-area { display: flex; gap: 8px; padding: 12px 16px; border-top: 1px solid var(--color-border); background: var(--color-surface); }
.kb-chat-input-area input {
  flex: 1; padding: 10px 14px; border: 1.5px solid var(--color-border);
  border-radius: var(--radius-full); font-size: 13px; outline: none;
  transition: border-color var(--transition-fast);
}
.kb-chat-input-area input:focus { border-color: var(--color-primary); }
.kb-chat-input-area button {
  width: 40px; height: 40px; border-radius: 50%; border: none;
  background: var(--color-primary); color: #fff; cursor: pointer;
  font-size: 16px; display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; transition: background var(--transition-fast);
}
.kb-chat-input-area button:hover { background: var(--color-primary-hover); }
.kb-chat-input-area button:disabled { background: var(--color-primary-light); cursor: not-allowed; }

/* ===== Pagination ===== */
.kb-pagination { display: flex; justify-content: center; gap: 6px; margin-top: 32px; }
.kb-page-link {
  width: 38px; height: 38px; display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--color-border); border-radius: var(--radius-sm);
  font-size: 14px; color: var(--color-text-secondary); transition: all var(--transition-fast);
}
.kb-page-link:hover { border-color: var(--color-primary); color: var(--color-primary); }
.kb-page-link.active { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }

/* ===== Empty State ===== */
.kb-empty { text-align: center; padding: 56px 24px; color: var(--color-text-muted); }
.kb-empty p { margin-bottom: 8px; font-size: 15px; }

.empty-hint { text-align: center; padding: 24px; color: var(--color-text-muted); font-size: 14px; }

/* ===== Back link ===== */
.kb-back { display: inline-block; margin-top: 24px; font-size: 14px; color: var(--color-text-secondary); }
.kb-back:hover { color: var(--color-primary); }

/* ===== Quick Contact CTA ===== */
.kb-quick-contact {
  background: linear-gradient(135deg, rgba(232,119,34,0.08), rgba(232,119,34,0.04));
  border-top: 1px solid var(--color-primary-border); border-bottom: 1px solid var(--color-primary-border);
}
.kb-quick-contact .container {
  display: flex; align-items: center; justify-content: space-between;
  padding: 24px; gap: 24px; max-width: 1200px; margin: 0 auto;
}
.kb-quick-contact-text h3 { font-size: 17px; font-weight: 700; color: var(--color-dark); margin-bottom: 4px; }
.kb-quick-contact-text p { font-size: 14px; color: var(--color-text-secondary); }
.kb-quick-contact-info { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.kb-quick-contact-info span, .kb-quick-contact-info a { font-size: 14px; }
.kb-quick-contact-info a {
  padding: 8px 18px; background: var(--color-primary); color: #fff;
  border-radius: var(--radius-full); font-weight: 500;
}
.kb-quick-contact-info a:hover { background: var(--color-primary-hover); color: #fff; }

/* ===== Footer ===== */
.kb-footer { background: var(--color-dark); color: #CBD5E1; padding: 48px 24px 24px; }
.kb-footer-grid { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 40px; }
.kb-footer h4 { color: #fff; font-size: 14px; font-weight: 600; margin-bottom: 14px; }
.kb-footer p { font-size: 14px; line-height: 1.6; }
.kb-footer-links { list-style: none; }
.kb-footer-links li { margin-bottom: 8px; }
.kb-footer-links a { font-size: 13px; color: #94A3B8; transition: color var(--transition-fast); }
.kb-footer-links a:hover { color: var(--color-primary); }

.kb-footer-brand p { font-size: 13px; color: #94A3B8; margin-top: 12px; }

.kb-footer-bottom {
  max-width: 1200px; margin: 32px auto 0; padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.08); text-align: center;
  font-size: 12px; color: #64748B;
}

/* ===== Scroll Fade-in ===== */
.kb-fade-in {
  opacity: 0; transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.kb-fade-in.visible { opacity: 1; transform: translateY(0); }
.kb-fade-in:nth-child(1) { transition-delay: 0s; }
.kb-fade-in:nth-child(2) { transition-delay: 0.08s; }
.kb-fade-in:nth-child(3) { transition-delay: 0.16s; }
.kb-fade-in:nth-child(4) { transition-delay: 0.24s; }
.kb-fade-in:nth-child(5) { transition-delay: 0.32s; }
.kb-fade-in:nth-child(6) { transition-delay: 0.4s; }
.kb-fade-in:nth-child(7) { transition-delay: 0.48s; }
.kb-fade-in:nth-child(8) { transition-delay: 0.56s; }
.kb-fade-in:nth-child(n+9) { transition-delay: 0.64s; }

/* ===== Loading Spinner ===== */
.kb-loading { display: inline-block; width: 24px; height: 24px; border: 2.5px solid var(--color-border); border-top-color: var(--color-primary); border-radius: 50%; animation: kbSpin 0.7s linear infinite; }
@keyframes kbSpin { to { transform: rotate(360deg); } }

/* ===== First-time Visitor Hint ===== */
.kb-first-visit-hint {
  position: fixed; bottom: 100px; right: 24px; z-index: 9998;
  max-width: 320px; padding: 16px 20px; background: var(--color-surface);
  border: 1px solid var(--color-border); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); font-size: 13px; line-height: 1.6;
  animation: kbSlideIn 0.4s ease;
}
@keyframes kbSlideIn { from { transform: translateX(20px); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
.kb-first-visit-hint strong { display: block; margin-bottom: 4px; font-size: 14px; color: var(--color-dark); }
.kb-first-visit-hint a { color: var(--color-primary); font-weight: 500; }
.kb-first-visit-close {
  position: absolute; top: 8px; right: 12px; background: none; border: none;
  font-size: 18px; cursor: pointer; color: var(--color-text-muted);
}

/* ===== Embed page ===== */
.kb-embed { font-family: var(--font-sans); height: 100vh; display: flex; flex-direction: column; }
.kb-embed-header { padding: 10px 16px; background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover)); color: #fff; font-size: 14px; font-weight: 600; display: flex; align-items: center; gap: 8px; }
.kb-embed-messages { flex: 1; overflow-y: auto; padding: 12px; background: var(--color-bg); display: flex; flex-direction: column; gap: 8px; }
.kb-embed-input-area { display: flex; gap: 6px; padding: 10px 12px; border-top: 1px solid var(--color-border); background: var(--color-surface); }
.kb-embed-input-area input { flex: 1; padding: 8px 12px; border: 1px solid var(--color-border); border-radius: var(--radius-full); font-size: 13px; outline: none; }
.kb-embed-input-area input:focus { border-color: var(--color-primary); }
.kb-embed-input-area button { padding: 8px 16px; background: var(--color-primary); color: #fff; border: none; border-radius: var(--radius-full); font-size: 13px; cursor: pointer; }

/* ===== Custom Scrollbar ===== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #CBD5E1; }

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

/* 1024px — Tablet landscape / small desktop */
@media (max-width: 1024px) {
  .kb-grid { grid-template-columns: 180px 1fr; gap: 24px; }
  .kb-contact-grid { grid-template-columns: 1fr; gap: 28px; }
  .kb-footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .kb-cat-cards { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
  .kb-search-input-sm { width: 140px; }
  .kb-search-input-sm:focus { width: 170px; }
}

/* 768px — Tablet */
@media (max-width: 768px) {
  .container { padding: 0 16px; }

  .kb-header .container { height: 56px; }
  .kb-logo-name { font-size: 15px; }
  .kb-logo-slogan { display: none; }

  /* Hamburger visible */
  .kb-mobile-menu-btn { display: flex; }

  /* Nav becomes slide-down */
  .kb-nav {
    position: fixed; top: 56px; left: 0; right: 0; bottom: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--color-surface); padding: 12px 16px;
    transform: translateX(100%); transition: transform var(--transition-slow);
    overflow-y: auto;
  }
  .kb-nav.open { transform: translateX(0); }
  .kb-nav a { padding: 14px 16px; font-size: 15px; border-bottom: 1px solid var(--color-border-light); border-radius: 0; }
  .kb-header-search { display: none; }
  .kb-mobile-search { display: flex; margin: 12px 0; }
  .kb-mobile-search .kb-search-input-sm { width: 100%; }
  .kb-mobile-search .kb-search-btn-sm { flex-shrink: 0; }

  .kb-hero { padding: 48px 16px 40px; }
  .kb-hero h1 { font-size: 26px; }
  .kb-hero p { font-size: 15px; }
  .kb-search-input { padding: 14px 18px; font-size: 15px; }
  .kb-search-btn { padding: 14px 24px; font-size: 14px; }

  .kb-grid { grid-template-columns: 1fr; gap: 0; padding: 24px 16px; }
  .kb-aside { position: static; margin-bottom: 20px; }
  .kb-cat-list { display: flex; flex-wrap: wrap; gap: 6px; }
  .kb-cat-list li { margin-bottom: 0; }
  .kb-cat-list a { font-size: 13px; padding: 6px 12px; border: 1px solid var(--color-border); border-radius: var(--radius-full); }

  .kb-cat-cards { grid-template-columns: repeat(3, 1fr); gap: 10px; }
  .kb-cat-card { padding: 20px 12px; }
  .kb-cat-card-icon { font-size: 28px; width: 48px; height: 48px; }
  .kb-cat-card-name { font-size: 13px; }
  .kb-cat-card-count { font-size: 11px; }

  .kb-section { padding: 36px 16px; }
  .kb-section-title { font-size: 24px; }
  .kb-article-header h1 { font-size: 24px; }
  .kb-article-body { font-size: 15px; }

  .kb-article-card { padding: 16px 18px; }
  .kb-article-card h3 { font-size: 15px; }

  .kb-form-row { grid-template-columns: 1fr; }

  .kb-quick-contact .container { flex-direction: column; text-align: center; }
  .kb-quick-contact-info { justify-content: center; }

  .kb-footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
  .kb-footer { padding: 36px 16px 20px; }

  .kb-faq-tabs { gap: 4px; }
  .kb-faq-tab { padding: 6px 14px; font-size: 12px; }

  .kb-chat-panel { width: calc(100vw - 32px); right: -8px; }
  .kb-chat-widget { bottom: 16px; right: 16px; }
}

/* 480px — Mobile */
@media (max-width: 480px) {
  .kb-hero h1 { font-size: 22px; }
  .kb-hero p { font-size: 14px; }
  .kb-cat-cards { grid-template-columns: repeat(2, 1fr); }
  .kb-search-form { flex-direction: column; box-shadow: none; border-radius: var(--radius-md); }
  .kb-search-input { border-radius: var(--radius-md) var(--radius-md) 0 0; border: 1.5px solid var(--color-border); }
  .kb-search-btn { border-radius: 0 0 var(--radius-md) var(--radius-md); padding: 14px; }
  .kb-footer-grid { grid-template-columns: 1fr; gap: 20px; }
  .kb-contact-grid { gap: 20px; }
  .kb-chat-panel { width: calc(100vw - 16px); right: -4px; max-height: 480px; }
  .kb-first-visit-hint { left: 16px; right: 16px; max-width: none; bottom: 88px; }
  .kb-detail-sidebar { padding: 16px; }
  .kb-article-header h1 { font-size: 21px; }
}