:root {
  /* Brand Palette derived directly from Sys-Metrics Official Logo */
  /* Primary Green: #29aa45 | Deep Prussian Navy: #112b46 */
  --bg-primary: #081320;
  --bg-secondary: #0d1e32;
  --bg-card: #11263f;
  --bg-input: #0a1829;
  --border-color: #1a385c;
  --border-focus: #29aa45;
  --text-primary: #f0fdf4;
  --text-secondary: #93b3d2;
  --text-muted: #5b7e9f;
  --accent-green: #29aa45;
  --accent-emerald: #22c55e;
  --accent-navy: #112b46;
  --accent-cyan: #29aa45; /* Brand Emerald Green for primary links & highlights */
  --accent-blue: #38bdf8;
  --accent-amber: #f59e0b;
  --accent-purple: #8b5cf6;
  --accent-rose: #f43f5e;
  --card-shadow: 0 10px 25px -5px rgba(5, 15, 27, 0.6), 0 8px 10px -6px rgba(5, 15, 27, 0.4);
  --glow-brand: 0 0 25px rgba(41, 170, 69, 0.25);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, Monaco, monospace;
}

[data-theme="light"] {
  --bg-primary: #f4f8fb;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-input: #ebf3f9;
  --border-color: #d1e2f0;
  --border-focus: #29aa45;
  --text-primary: #0a1b2d;
  --text-secondary: #3b5a7a;
  --text-muted: #6e8fae;
  --accent-green: #29aa45;
  --accent-cyan: #22993d;
  --card-shadow: 0 4px 12px -2px rgba(17, 43, 70, 0.08);
  --glow-brand: 0 0 15px rgba(41, 170, 69, 0.15);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

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

a {
  color: var(--accent-green);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

/* Header & Navigation */
header.site-header {
  background-color: rgba(13, 30, 50, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}
[data-theme="light"] header.site-header {
  background-color: rgba(255, 255, 255, 0.94);
}

.header-container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.brand-logo-img {
  height: 40px;
  width: auto;
  object-fit: contain;
  filter: drop-shadow(0 2px 8px rgba(41, 170, 69, 0.3));
  transition: transform 0.2s ease;
}
.brand-logo-img:hover {
  transform: scale(1.04);
}

.logo-text {
  font-size: 1.3rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}
.logo-text span {
  color: var(--accent-green);
}

nav.main-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

nav.main-nav a.nav-link {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
  text-decoration: none;
}

nav.main-nav a.nav-link:hover,
nav.main-nav a.nav-link.active {
  color: var(--text-primary);
  background-color: var(--bg-surface-2);
  border-bottom: 2px solid var(--accent-green);
  text-decoration: none;
}

/* Category Filter Pills (Homepage) */
.category-pills {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 1.25rem;
}

.category-pill {
  background: var(--bg-surface-2);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.4rem 0.9rem;
  border-radius: 9999px;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: inherit;
}

.category-pill:hover,
.category-pill.active {
  background: var(--accent-green);
  border-color: var(--accent-green);
  color: #ffffff;
  font-weight: 600;
}

/* Google Translate Widget & Custom Dropdown */
.goog-te-banner-frame.skiptranslate,
.goog-te-gadget-icon,
#goog-gt-tt,
.goog-te-balloon-frame {
  display: none !important;
}
body {
  top: 0px !important;
}
.skiptranslate iframe {
  display: none !important;
}
.goog-text-highlight {
  background: none !important;
  box-shadow: none !important;
}

/* Custom Header Language Selector */
.lang-dropdown {
  position: relative;
  display: inline-block;
}

.lang-dropdown-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.95rem;
  height: 38px;
  padding: 0 0.55rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  transition: all 0.2s ease;
  font-family: inherit;
}

.lang-dropdown-btn:hover,
.lang-dropdown.open .lang-dropdown-btn {
  color: var(--text-primary);
  border-color: var(--accent-green);
  background: var(--bg-surface-2);
}

.dropdown-chevron {
  font-size: 0.65rem;
  opacity: 0.75;
  transition: transform 0.2s ease;
  display: inline-block;
}

.lang-dropdown.open .dropdown-chevron {
  transform: rotate(180deg);
}

.lang-dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 0.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.45);
  padding: 0.5rem;
  width: 210px;
  max-height: 380px;
  overflow-y: auto;
  z-index: 1001;
}

.lang-dropdown:hover .lang-dropdown-menu,
.lang-dropdown.open .lang-dropdown-menu {
  display: flex;
  flex-direction: column;
}

.lang-opt {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 0.85rem;
  padding: 0.45rem 0.65rem;
  text-align: left;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s ease;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: inherit;
  width: 100%;
}

.lang-opt:hover {
  background: var(--bg-surface-2);
  color: var(--accent-green);
  font-weight: 600;
}

.theme-toggle-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1rem;
  transition: all 0.2s ease;
}
.theme-toggle-btn:hover {
  color: var(--text-primary);
  border-color: var(--accent-green);
  background: var(--bg-surface-2);
}

.mobile-menu-btn {
  display: none;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  width: 38px;
  height: 38px;
  font-size: 1.15rem;
  cursor: pointer;
  transition: all 0.2s ease;
}
.mobile-menu-btn:hover {
  border-color: var(--accent-green);
  background: var(--bg-surface-2);
}

/* Main Container Layout */
.main-wrapper {
  max-width: 1240px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
  width: 100%;
  flex: 1;
}

/* Two Column Layout for Tools + Sidebar */
.content-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 2rem;
  align-items: start;
}

.content-layout.single-column {
  grid-template-columns: 1fr;
  max-width: 980px;
  margin: 0 auto;
}

/* AdSense Slot Wrappers (Compliant with Google policies) */
.ad-slot-wrapper {
  margin: 1.25rem 0;
  text-align: center;
  background: var(--bg-secondary);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.75rem;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  display: block;
  position: relative;
  overflow: hidden;
  transition: opacity 0.3s ease;
}

.ad-slot-wrapper ins.adsbygoogle {
  display: block !important;
  width: 100% !important;
  min-width: 280px;
  min-height: 90px;
  margin: 0 auto;
  box-sizing: border-box;
}

/* Graceful collapse when AdBlocker blocks adsbygoogle */
.ad-slot-wrapper.ad-blocked {
  display: none !important;
}

.ad-label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
  font-weight: 600;
  display: block;
  text-align: center;
}

.ad-banner-top {
  margin: 0.75rem 0 1.75rem;
}

.ad-sidebar {
  min-height: 280px;
  position: sticky;
  top: 80px;
  width: 100%;
}

.ad-sidebar ins.adsbygoogle {
  min-height: 250px;
}

/* Hero Section */
.hero-section {
  text-align: center;
  padding: 2.5rem 1rem 2rem;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(41, 170, 69, 0.12);
  border: 1px solid rgba(41, 170, 69, 0.35);
  color: var(--accent-green);
  padding: 0.35rem 0.95rem;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hero-title {
  font-size: 2.75rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, #29aa45 0%, #38bdf8 50%, #22c55e 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 1.75rem;
}

/* Tool Search & Filter */
.search-box-wrapper {
  max-width: 580px;
  margin: 0 auto 2.5rem;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 0.85rem 1rem 0.85rem 2.85rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-size: 1rem;
  box-shadow: var(--card-shadow);
  outline: none;
}
.search-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(41, 170, 69, 0.25);
}

.search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

/* Quick Tools Grid (Home) */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  position: relative;
  overflow: hidden;
}

.tool-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent-green);
  box-shadow: var(--glow-brand), var(--card-shadow);
  text-decoration: none;
}

.tool-card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.icon-cyan { background: rgba(41, 170, 69, 0.15); color: var(--accent-green); }
.icon-blue { background: rgba(56, 189, 248, 0.15); color: var(--accent-blue); }
.icon-green { background: rgba(41, 170, 69, 0.15); color: var(--accent-green); }
.icon-amber { background: rgba(245, 158, 11, 0.15); color: var(--accent-amber); }
.icon-purple { background: rgba(139, 92, 246, 0.15); color: var(--accent-purple); }
.icon-rose { background: rgba(244, 63, 94, 0.15); color: var(--accent-rose); }

.tool-card-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.tool-card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 1.25rem;
  flex: 1;
}

.tool-card-footer {
  font-size: 0.825rem;
  font-weight: 700;
  color: var(--accent-green);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

/* Tool Interface Panels */
.tool-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--card-shadow);
  margin-bottom: 2rem;
}

.tool-header {
  margin-bottom: 1.75rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1.25rem;
}

.tool-header h1 {
  font-size: 1.9rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.4rem;
}

.tool-header p {
  color: var(--text-secondary);
  font-size: 1rem;
}

/* Input Elements & Forms */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
}

.input-row {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: var(--font-sans);
  outline: none;
}

.form-input.font-mono, .form-textarea.font-mono {
  font-family: var(--font-mono);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px rgba(41, 170, 69, 0.25);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 0.925rem;
  cursor: pointer;
  border: none;
  transition: all 0.2s ease;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, #29aa45 0%, #112b46 100%);
  color: #fff;
  box-shadow: 0 4px 14px rgba(41, 170, 69, 0.3);
}
.btn-primary:hover {
  background: linear-gradient(135deg, #2fbd4e 0%, #1a3d63 100%);
  transform: translateY(-1px);
  text-decoration: none;
  box-shadow: 0 6px 18px rgba(41, 170, 69, 0.45);
}

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}
.btn-secondary:hover {
  background: var(--border-color);
  text-decoration: none;
}

.btn-sm {
  padding: 0.4rem 0.75rem;
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
}

/* Result Cards & Tables */
.results-box {
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-top: 1.5rem;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
}

.result-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
}

.result-item-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.result-item-value {
  font-size: 1.15rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--text-primary);
  word-break: break-all;
}

.badge {
  display: inline-block;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 700;
}
.badge-private { background: rgba(41, 170, 69, 0.2); color: var(--accent-green); }
.badge-public { background: rgba(56, 189, 248, 0.2); color: var(--accent-blue); }

/* Visual Arrays (RAID Disks, Subnet Bit Visualizer) */
.visual-array {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin: 1.25rem 0;
}

.disk-box {
  flex: 1;
  min-width: 80px;
  max-width: 120px;
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.75rem 0.5rem;
  text-align: center;
  position: relative;
}

.disk-box.usable { border-color: var(--accent-green); }
.disk-box.parity { border-color: var(--accent-amber); background: rgba(245, 158, 11, 0.05); }
.disk-box.mirror { border-color: var(--accent-purple); background: rgba(139, 92, 246, 0.05); }

.disk-title { font-size: 0.8rem; font-weight: 700; margin-bottom: 0.25rem; }
.disk-status { font-size: 0.7rem; color: var(--text-muted); }

/* Educational Content Section (Ensures high SEO and AdSense Quality) */
.edu-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-top: 2rem;
  line-height: 1.7;
}

.edu-content h2 {
  font-size: 1.5rem;
  font-weight: 800;
  margin: 1.5rem 0 0.75rem;
  color: var(--text-primary);
}
.edu-content h2:first-child { margin-top: 0; }

.edu-content h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 1.25rem 0 0.5rem;
  color: var(--accent-green);
}

.edu-content p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.edu-content ul, .edu-content ol {
  color: var(--text-secondary);
  margin: 0 0 1rem 1.5rem;
}

.edu-content li {
  margin-bottom: 0.35rem;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25rem 0;
  font-size: 0.9rem;
}

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

.data-table th {
  background: var(--bg-secondary);
  font-weight: 700;
  color: var(--text-primary);
}

.data-table td {
  color: var(--text-secondary);
}

.data-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

/* Footer */
footer.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 3rem 1.25rem 2rem;
  margin-top: auto;
}

.footer-container {
  max-width: 1240px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 2rem;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 0.75rem;
  max-width: 340px;
}

.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 0.5rem;
}

.footer-col a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  transition: color 0.2s ease;
}

.footer-col a:hover {
  color: var(--text-primary);
  text-decoration: none;
}

.footer-bottom {
  max-width: 1240px;
  margin: 0 auto;
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 1rem;
}

/* AEO (Answer Engine Optimization) Direct Answer Callout Box */
.aeo-quick-answer {
  background: rgba(41, 170, 69, 0.09);
  border: 1px solid rgba(41, 170, 69, 0.35);
  border-left: 4px solid var(--accent-green);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin: 1.5rem 0;
}

.aeo-quick-answer-title {
  font-size: 0.85rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-green);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.aeo-quick-answer p {
  color: var(--text-primary);
  font-size: 1rem;
  line-height: 1.6;
  margin-bottom: 0;
}

/* Floating AI Assistant Widget */
.ai-assistant-toggle {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: linear-gradient(135deg, #29aa45, #112b46);
  color: #fff;
  border: none;
  border-radius: 9999px;
  padding: 0.75rem 1.35rem;
  font-weight: 700;
  font-size: 0.95rem;
  box-shadow: 0 10px 25px rgba(41, 170, 69, 0.35);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  z-index: 1000;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.ai-assistant-toggle:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(41, 170, 69, 0.5);
}

.ai-assistant-modal {
  display: none;
  position: fixed;
  bottom: 84px;
  right: 24px;
  width: 420px;
  max-width: calc(100vw - 32px);
  height: 540px;
  max-height: calc(100vh - 120px);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
  z-index: 1001;
  flex-direction: column;
  overflow: hidden;
}

.ai-modal-header {
  padding: 1rem 1.25rem;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.ai-modal-header h3 {
  font-size: 1rem;
  font-weight: 800;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.ai-modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.25rem;
  cursor: pointer;
}
.ai-modal-close:hover { color: var(--text-primary); }

.ai-modal-messages {
  flex: 1;
  padding: 1rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.ai-message {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  line-height: 1.5;
  max-width: 85%;
}

.ai-msg-bot {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  align-self: flex-start;
}

.ai-msg-user {
  background: linear-gradient(135deg, #29aa45, #112b46);
  color: #fff;
  align-self: flex-end;
}

.ai-prompt-chips {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
  margin-top: 0.5rem;
}

.ai-chip {
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: 9999px;
  padding: 0.25rem 0.65rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s ease;
}
.ai-chip:hover {
  border-color: var(--accent-green);
  color: var(--accent-green);
}

.ai-modal-input-area {
  padding: 0.75rem 1rem;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  display: flex;
  gap: 0.5rem;
}

.ai-input {
  flex: 1;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.85rem;
  color: var(--text-primary);
  font-size: 0.875rem;
  outline: none;
}
.ai-input:focus {
  border-color: var(--border-focus);
}

@media (max-width: 900px) {
  .content-layout {
    grid-template-columns: 1fr;
  }
  .ad-sidebar {
    position: static;
  }
  .footer-container {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 860px) {
  .header-container {
    padding: 0.65rem 1rem;
    gap: 0.75rem;
  }
  .brand-logo-img {
    height: 34px;
  }
  .logo-text {
    font-size: 1.15rem;
  }
  .header-actions {
    gap: 0.4rem;
  }
  nav.main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: 0.85rem 1.25rem;
    gap: 0.4rem;
    box-shadow: 0 16px 36px rgba(0, 0, 0, 0.45);
    z-index: 999;
  }
  nav.main-nav.open {
    display: flex;
  }
  nav.main-nav a.nav-link {
    width: 100%;
    padding: 0.65rem 1rem;
    font-size: 1rem;
    border-radius: var(--radius-sm);
  }
  .mobile-menu-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
  .lang-dropdown-menu {
    right: -6px;
    width: 220px;
    max-width: 88vw;
  }
  .hero-title {
    font-size: 2.2rem;
  }
}

@media (max-width: 640px) {
  .hero-title {
    font-size: 1.85rem;
  }
  .footer-container {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .header-container {
    padding: 0.5rem 0.75rem;
    gap: 0.5rem;
  }
  .logo-area {
    gap: 0.45rem;
  }
  .brand-logo-img {
    height: 30px;
  }
  .logo-text {
    font-size: 1.05rem;
  }
  .header-actions {
    gap: 0.35rem;
  }
  .lang-dropdown-btn {
    height: 35px;
    padding: 0 0.45rem;
    font-size: 0.9rem;
  }
  .theme-toggle-btn,
  .mobile-menu-btn {
    width: 35px;
    height: 35px;
    font-size: 0.95rem;
  }
}

/* Print Stylesheet for Invoices */
@media print {
  header.site-header,
  footer.site-footer,
  aside.sidebar-col,
  .ad-slot-wrapper,
  .edu-content,
  .aeo-quick-answer,
  .ai-assistant-toggle,
  .ai-assistant-modal,
  .btn,
  .remove-row-btn,
  #invoiceAddItem {
    display: none !important;
  }
  body, .main-wrapper, .content-layout, .main-content-col {
    background: #ffffff !important;
    color: #000000 !important;
    padding: 0 !important;
    margin: 0 !important;
    max-width: 100% !important;
    box-shadow: none !important;
  }
  .tool-panel.invoice-sheet {
    border: none !important;
    box-shadow: none !important;
    background: #ffffff !important;
    color: #000000 !important;
    padding: 0 !important;
  }
  .form-input, .form-select {
    border: none !important;
    background: transparent !important;
    color: #000000 !important;
    padding: 2px 0 !important;
  }
}