/* ===== AIBuildCalc - AI-Powered Build Calculator ===== */
/* Clean, intelligent, professional — built for US homeowners */

:root {
  --primary: #1a73e8;
  --primary-dark: #1557b0;
  --primary-light: #e8f0fe;
  --ai-gradient: linear-gradient(135deg, #1a73e8 0%, #7c4dff 100%);
  --ai-glow: 0 0 20px rgba(26, 115, 232, 0.15);
  --ai-purple: #7c4dff;
  --ai-purple-light: #ede7f6;
  --accent: #f9ab00;
  --accent-hover: #e09d00;
  --success: #1e8e3e;
  --success-bg: #e6f4ea;
  --danger: #d93025;
  --bg: #f8f9fa;
  --card-bg: #ffffff;
  --text: #202124;
  --text-secondary: #5f6368;
  --text-light: #80868b;
  --border: #dadce0;
  --border-light: #f1f3f4;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.06), 0 1px 3px rgba(0,0,0,0.1);
  --shadow-md: 0 2px 6px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --radius: 8px;
  --radius-lg: 12px;
  --max-width: 1200px;
  --sidebar-width: 300px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

/* ===== Header ===== */
.site-header {
  background: #fff;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  height: 60px;
}

.site-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 10px;
  letter-spacing: -0.01em;
}
.site-logo:hover { text-decoration: none; color: var(--primary); }

.site-logo .logo-icon {
  background: var(--ai-gradient);
  color: #fff;
  width: 32px;
  height: 32px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.5px;
}

/* Nav */
.main-nav { display: flex; gap: 0; }
.main-nav a {
  color: var(--text-secondary);
  padding: 8px 14px;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.15s, background 0.15s;
  border-radius: 6px;
  white-space: nowrap;
}
.main-nav a:hover {
  color: var(--primary);
  background: var(--primary-light);
  text-decoration: none;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 6px 10px;
  border-radius: 6px;
  line-height: 1;
}

/* ===== Breadcrumb ===== */
.breadcrumb {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 12px 24px;
  font-size: 0.8125rem;
  color: var(--text-light);
}
.breadcrumb a { color: var(--primary); }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb span { margin: 0 6px; color: var(--border); }

/* ===== Main Layout ===== */
.page-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 48px;
  display: grid;
  grid-template-columns: 1fr var(--sidebar-width);
  gap: 32px;
}

.main-content { min-width: 0; }

/* ===== Tool Card ===== */
.tool-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 24px;
}

.tool-card-header {
  background: linear-gradient(135deg, var(--primary-light) 0%, #ede7f6 100%);
  border-bottom: 2px solid transparent;
  border-image: var(--ai-gradient) 1;
  padding: 28px 32px 20px;
}

.tool-card-header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}

.tool-card-header p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

.tool-card-body {
  padding: 24px 32px 28px;
}

/* ===== Calculator Form ===== */
.calc-form { display: grid; gap: 16px; }

.form-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.form-group label {
  font-weight: 600;
  font-size: 0.8125rem;
  color: var(--text);
  letter-spacing: 0.01em;
}

.form-group .label-hint {
  font-weight: 400;
  font-size: 0.75rem;
  color: var(--text-light);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.form-group input,
.form-group select {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.9375rem;
  transition: border-color 0.15s, box-shadow 0.15s;
  background: #fff;
  color: var(--text);
  height: 42px;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26,115,232,0.15);
}

.form-group .input-suffix {
  display: flex;
  align-items: center;
  gap: 8px;
}
.form-group .input-suffix input { flex: 1; }
.form-group .input-suffix select { width: 100px; padding: 10px 8px; }

.unit-label {
  font-weight: 400;
  color: var(--text-light);
  font-size: 0.8125rem;
}

.btn-reset {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  padding: 10px 24px;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s;
  width: 100%;
  margin-top: 4px;
}
.btn-reset:hover {
  background: var(--border-light);
}

/* ===== Results ===== */
.result-section {
  display: none;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.result-section.show { display: block; }

.result-main .result-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
  margin-bottom: 4px;
}

.result-main .result-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--success);
  letter-spacing: -0.02em;
}

.result-main .result-unit {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.result-details {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px;
}

.result-detail {
  background: var(--border-light);
  border-radius: 6px;
  padding: 12px 14px;
  text-align: center;
}

.result-detail .detail-label {
  font-size: 0.6875rem;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 600;
  margin-bottom: 2px;
}

.result-detail .detail-value {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text);
}

.result-detail .detail-unit {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* ===== Content Sections ===== */
.content-section {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  margin-bottom: 16px;
}

.content-section h2 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-light);
  letter-spacing: -0.01em;
}

.content-section h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin: 16px 0 8px;
}

.content-section p {
  margin-bottom: 10px;
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.content-section ul, .content-section ol {
  margin: 8px 0 14px 20px;
  color: var(--text-secondary);
  font-size: 0.9375rem;
}
.content-section li { margin-bottom: 6px; }

/* Formula box */
.formula-box {
  background: #fef7e0;
  border: 1px solid #f9e79e;
  border-radius: 6px;
  padding: 14px 18px;
  margin: 0;
  font-family: 'SF Mono', 'Fira Code', 'Courier New', monospace;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--text);
  white-space: pre-line;
}

/* ===== FAQ ===== */
.faq-item {
  border-bottom: 1px solid var(--border-light);
  padding: 14px 0;
}
.faq-item:last-child { border-bottom: none; }

.faq-question {
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  padding: 2px 0;
  font-size: 0.9375rem;
}

.faq-question::after {
  content: '+';
  font-size: 1.25rem;
  color: var(--primary);
  flex-shrink: 0;
  font-weight: 400;
  transition: transform 0.2s;
}

.faq-item.open .faq-question::after {
  content: '\2212';
}

.faq-answer {
  display: none;
  padding-top: 10px;
  color: var(--text-secondary);
  line-height: 1.7;
  font-size: 0.9375rem;
}
.faq-item.open .faq-answer { display: block; }

/* ===== Related Tools ===== */
.related-tools {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.related-tool-card {
  background: var(--border-light);
  border-radius: 6px;
  padding: 12px 14px;
  transition: background 0.15s;
  display: flex;
  align-items: center;
  gap: 10px;
}
.related-tool-card:hover {
  background: var(--primary-light);
  text-decoration: none;
}

.related-tool-card .tool-icon {
  font-size: 1.2rem;
  flex-shrink: 0;
}

.related-tool-card .tool-name {
  font-weight: 600;
  font-size: 0.8125rem;
  color: var(--text);
}

/* ===== Sidebar ===== */
.sidebar {}

.ad-slot {
  background: var(--border-light);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  min-height: 250px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-light);
  font-size: 0.8125rem;
  margin-bottom: 16px;
}

.sidebar-section {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px;
  margin-bottom: 16px;
}

.sidebar-section h3 {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-light);
}

.sidebar-links { list-style: none; }
.sidebar-links li { margin-bottom: 2px; }
.sidebar-links a {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  padding: 6px 8px;
  border-radius: 4px;
  color: var(--text-secondary);
  transition: background 0.15s, color 0.15s;
}
.sidebar-links a:hover {
  background: var(--primary-light);
  color: var(--primary);
  text-decoration: none;
}
.sidebar-links a.active {
  color: var(--primary);
  font-weight: 600;
  background: var(--primary-light);
}
.sidebar-links .cat-icon {
  font-size: 1rem;
  flex-shrink: 0;
}

/* ===== Category Page Grid ===== */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px;
  margin-top: 16px;
}

.category-tool-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: box-shadow 0.15s, border-color 0.15s;
  display: flex;
  flex-direction: column;
}
.category-tool-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  text-decoration: none;
}

.category-tool-card .card-icon {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.category-tool-card h3 {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}

.category-tool-card p {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
  flex: 1;
  line-height: 1.5;
}

.category-tool-card .card-link {
  color: var(--primary);
  font-weight: 600;
  font-size: 0.8125rem;
}

/* ===== Home Page ===== */
.hero-section {
  background: var(--primary);
  color: #fff;
  padding: 56px 24px;
  text-align: center;
}

.hero-section h1 {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -0.03em;
}

.hero-section p {
  font-size: 1.0625rem;
  opacity: 0.9;
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.6;
}

.categories-section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 24px;
}

.categories-section h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.category-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
}

.home-category-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: box-shadow 0.15s, border-color 0.15s;
  text-align: left;
}
.home-category-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  text-decoration: none;
}

.home-category-card .cat-emoji {
  font-size: 1.75rem;
  margin-bottom: 10px;
}

.home-category-card h3 {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 2px;
}

.home-category-card .tool-count {
  font-size: 0.8125rem;
  color: var(--text-light);
  margin-bottom: 10px;
}

.home-category-card .view-link {
  color: var(--primary);
  font-weight: 600;
  font-size: 0.8125rem;
}

/* Popular tools on home */
.popular-tools {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 8px;
  margin-top: 16px;
}

.popular-tool {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: border-color 0.15s;
}
.popular-tool:hover {
  border-color: var(--primary);
  text-decoration: none;
}

.popular-tool .pt-icon { font-size: 1.1rem; }
.popular-tool .pt-name { font-weight: 600; font-size: 0.8125rem; color: var(--text); }
.popular-tool .pt-cat { font-size: 0.6875rem; color: var(--text-light); }

/* ===== Footer ===== */
.site-footer {
  background: #fff;
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 40px 24px 20px;
  margin-top: 40px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
}

.footer-col h4 {
  color: var(--text);
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 12px;
}

.footer-col p {
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 6px; }
.footer-col ul a {
  color: var(--text-secondary);
  font-size: 0.8125rem;
}
.footer-col ul a:hover { color: var(--primary); }

.footer-bottom {
  max-width: var(--max-width);
  margin: 20px auto 0;
  padding-top: 16px;
  border-top: 1px solid var(--border-light);
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-light);
}

/* ===== Responsive ===== */
@media (max-width: 960px) {
  .page-container { grid-template-columns: 1fr; }
  .sidebar { display: none; }
}

@media (max-width: 768px) {
  .header-inner { height: 52px; }
  .main-nav { display: none; }
  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 52px;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--border);
    padding: 8px 16px;
    box-shadow: var(--shadow-md);
    z-index: 99;
  }
  .mobile-menu-btn { display: block; }
  .hero-section h1 { font-size: 1.5rem; }
  .hero-section p { font-size: 0.9375rem; }
  .hero-section { padding: 40px 20px; }
  .form-row { grid-template-columns: 1fr; }
  .result-details { grid-template-columns: 1fr 1fr; }
  .related-tools { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .tool-card-header h1 { font-size: 1.35rem; }
  .tool-card-body { padding: 20px; }
  .tool-card-header { padding: 20px 20px 14px; }
  .categories-section { padding: 28px 20px; }
}

@media (max-width: 480px) {
  .footer-inner { grid-template-columns: 1fr; }
  .category-grid { grid-template-columns: 1fr; }
  .result-details { grid-template-columns: 1fr; }
}

/* ===== Ad Placeholder ===== */
.ad-inline {
  margin: 20px 0;
  min-height: 100px;
}

/* ===== AI Enhanced Features ===== */

/* Logo icon with AI gradient */
.logo-icon {
  background: var(--ai-gradient);
  color: #fff;
  font-weight: 700;
  font-size: 0.8125rem;
  padding: 4px 8px;
  border-radius: 6px;
  letter-spacing: 0.5px;
  margin-right: 6px;
  display: inline-block;
}

/* AI Calculate button */
.btn-calculate {
  background: var(--ai-gradient);
  color: #fff;
  font-size: 0.9375rem;
  font-weight: 600;
  border: none;
  padding: 12px 28px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 2px 8px rgba(26,115,232,0.25);
}
.btn-calculate:hover {
  box-shadow: 0 4px 16px rgba(26,115,232,0.35);
  transform: translateY(-1px);
}
.btn-icon {
  font-size: 1rem;
}

/* AI Badge - small */
.ai-badge-sm {
  background: var(--ai-gradient);
  color: #fff;
  font-size: 0.6875rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  display: inline-block;
}

/* AI Badge - large */
.ai-badge {
  background: var(--ai-gradient);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 6px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  display: inline-block;
}

/* AI Smart Tip */
.ai-tip {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: linear-gradient(135deg, #e8f0fe 0%, #ede7f6 100%);
  border: 1px solid #d2e3fc;
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-top: 16px;
  animation: fadeIn 0.3s ease;
}
.ai-tip-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.8125rem;
  color: var(--primary-dark);
}
.ai-tip p {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

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

/* AI Insights Section */
.ai-insights {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin: 24px 0;
}
.ai-insights-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.ai-insights-subtitle {
  font-size: 0.8125rem;
  color: var(--text-light);
  font-weight: 400;
}
.ai-insights-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.ai-insight-card {
  background: linear-gradient(135deg, #f8f9fa 0%, #f3e8fd08 100%);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 16px;
  transition: border-color 0.2s;
}
.ai-insight-card:hover {
  border-color: var(--primary);
}
.insight-icon {
  font-size: 1.5rem;
  margin-bottom: 8px;
}
.insight-title {
  font-weight: 600;
  font-size: 0.8125rem;
  color: var(--text);
  margin-bottom: 4px;
}
.insight-desc {
  font-size: 0.75rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Result main with AI glow */
.result-main {
  background: linear-gradient(135deg, var(--primary-light) 0%, #ede7f6 100%);
  border: 1px solid #d2e3fc;
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
  position: relative;
}
.result-main::after {
  content: 'AI Verified';
  position: absolute;
  top: 8px;
  right: 8px;
  font-size: 0.5625rem;
  background: var(--ai-gradient);
  color: #fff;
  padding: 2px 6px;
  border-radius: 3px;
  font-weight: 600;
  letter-spacing: 0.3px;
  text-transform: uppercase;
}

/* Hero Badge */
.hero-badge {
  background: var(--ai-gradient);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 20px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  display: inline-block;
  margin-bottom: 12px;
  box-shadow: 0 2px 8px rgba(26,115,232,0.25);
}

/* Hero Stats */
.hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 20px;
  justify-content: center;
}
.hero-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.stat-num {
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--ai-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* Tool card header with AI accent */
.tool-card-header {
  background: linear-gradient(135deg, var(--primary-light) 0%, #ede7f6 100%);
  border-bottom: 2px solid transparent;
  border-image: var(--ai-gradient) 1;
  padding: 20px 24px;
}
.tool-card-header h1 {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}
.tool-card-header p {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Category tool card with AI hover */
.category-tool-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  text-decoration: none;
  color: var(--text);
  transition: all 0.2s;
  position: relative;
}
.category-tool-card:hover {
  border-color: var(--primary);
  box-shadow: var(--ai-glow);
  transform: translateY(-1px);
}

/* Popular tool with AI accent */
.popular-tool {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 6px;
  text-decoration: none;
  color: var(--text);
  transition: background 0.15s;
}
.popular-tool:hover {
  background: linear-gradient(135deg, var(--primary-light) 0%, #ede7f6 100%);
}
.pt-icon {
  background: var(--ai-gradient);
  color: #fff;
  font-size: 0.5625rem;
  font-weight: 700;
  padding: 4px 8px;
  border-radius: 4px;
  min-width: 32px;
  text-align: center;
  letter-spacing: 0.3px;
  text-transform: uppercase;
}

/* Responsive AI features */
@media (max-width: 768px) {
  .ai-insights-grid {
    grid-template-columns: 1fr;
  }
  .hero-stats {
    gap: 20px;
  }
  .stat-num {
    font-size: 1.25rem;
  }
}

/* ===== Print ===== */
@media print {
  .site-header, .sidebar, .site-footer, .ad-slot, .ad-inline, .ai-tip, .ai-insights { display: none; }
  .page-container { grid-template-columns: 1fr; }
}