:root {
  --color-primary: #111111;
  --color-primary-active: #242424;
  --color-ink: #111111;
  --color-body: #374151;
  --color-muted: #6b7280;
  --color-muted-soft: #898989;
  --color-hairline: #e5e7eb;
  --color-hairline-soft: #f3f4f6;
  --color-canvas: #ffffff;
  --color-surface-soft: #f8f9fa;
  --color-surface-card: #f5f5f5;
  --color-surface-dark: #101010;
  --color-on-dark: #ffffff;
  --color-on-dark-soft: #a1a1aa;
  --color-accent: #3b82f6;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-pill: 9999px;
}

* { box-sizing: border-box; }

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--color-body);
  background-color: var(--color-canvas);
  font-size: 16px;
  line-height: 1.5;
}

h1, h2, h3, h4 {
  color: var(--color-ink);
  font-weight: 600;
  letter-spacing: -0.5px;
  line-height: 1.2;
}

h1 { font-size: 44px; letter-spacing: -1.5px; }
h2 { font-size: 30px; letter-spacing: -1px; }
h3 { font-size: 20px; letter-spacing: -0.3px; }

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

.site-header {
  border-bottom: 1px solid var(--color-hairline);
  background-color: var(--color-canvas);
  padding: 12px 0;
}

.navbar-brand {
  font-weight: 600;
  font-size: 20px;
  letter-spacing: -0.5px;
  color: var(--color-ink);
}

.site-navbar .nav-link {
  color: var(--color-ink);
  font-weight: 500;
  font-size: 14px;
  padding: 8px 14px !important;
}

.site-navbar .nav-link:hover { text-decoration: none; color: var(--color-primary-active); }

.hero-band {
  padding: 64px 0;
  background-color: var(--color-canvas);
  border-bottom: 1px solid var(--color-hairline-soft);
}

.hero-band h1 { margin-bottom: 16px; }

.hero-lede {
  font-size: 18px;
  color: var(--color-muted);
  max-width: 640px;
}

.btn-dark, .btn.btn-dark {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 14px;
  padding: 10px 20px;
}

.btn-dark:hover, .btn.btn-dark:hover {
  background-color: var(--color-primary-active);
  border-color: var(--color-primary-active);
}

.btn-outline-dark {
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 14px;
  color: var(--color-ink);
  border-color: var(--color-hairline);
}

.section {
  padding: 56px 0;
}

.section-alt {
  background-color: var(--color-surface-soft);
}

.section-heading {
  margin-bottom: 24px;
}

.feature-card, .article-card, .related-card {
  display: block;
  background-color: var(--color-surface-card);
  border-radius: var(--radius-lg);
  padding: 24px;
  height: 100%;
  color: var(--color-ink);
}

.feature-card:hover, .article-card:hover, .related-card:hover {
  text-decoration: none;
  background-color: var(--color-hairline-soft);
}

.article-card img, .related-card img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin-bottom: 16px;
}

.article-category, .related-category {
  display: inline-block;
  background-color: var(--color-canvas);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-pill);
  padding: 4px 12px;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-muted);
  margin-bottom: 12px;
}

.article-title, .related-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-ink);
}

.article-desc, .related-desc {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 0;
}

.breadcrumb-nav {
  padding: 16px 0;
}

.breadcrumb {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 0;
}

.breadcrumb-item + .breadcrumb-item::before {
  content: ">";
}

.layout-with-sidebar {
  display: flex;
  gap: 40px;
  align-items: flex-start;
}

.layout-sidebar {
  width: 260px;
  flex-shrink: 0;
  position: sticky;
  top: 24px;
}

.layout-main {
  flex: 1;
  min-width: 0;
}

.sidebar-card {
  background-color: var(--color-surface-card);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 20px;
}

.sidebar-card h3 {
  font-size: 16px;
  margin-bottom: 12px;
}

.sidebar-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sidebar-card li {
  margin-bottom: 8px;
  font-size: 14px;
}

.toc-box {
  background-color: var(--color-surface-soft);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  margin: 24px 0;
}

.toc-box h2 {
  font-size: 16px;
  margin-bottom: 12px;
}

.toc-box ol {
  margin: 0;
  padding-left: 20px;
}

.toc-box li { margin-bottom: 6px; font-size: 14px; }

.article-body img {
  max-width: 100%;
  border-radius: var(--radius-md);
  margin: 16px 0;
}

.article-body h2 {
  margin-top: 40px;
  margin-bottom: 16px;
}

.article-body h3 {
  margin-top: 24px;
  margin-bottom: 12px;
}

.article-body p { margin-bottom: 16px; }

.image-credit {
  font-size: 12px;
  color: var(--color-muted-soft);
  margin-top: -8px;
  margin-bottom: 24px;
}

.faq-item {
  border-bottom: 1px solid var(--color-hairline);
  padding: 16px 0;
}

.faq-item summary {
  font-weight: 600;
  cursor: pointer;
  color: var(--color-ink);
  font-size: 16px;
}

.faq-item p {
  margin-top: 12px;
  color: var(--color-muted);
}

.timeline {
  border-left: 2px solid var(--color-hairline);
  padding-left: 24px;
  margin-left: 8px;
}

.timeline-item {
  position: relative;
  margin-bottom: 32px;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--color-primary);
}

.timeline-date {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-muted);
  margin-bottom: 4px;
}

.related-content {
  padding: 48px 0;
  border-top: 1px solid var(--color-hairline-soft);
  margin-top: 48px;
}

.site-footer {
  background-color: var(--color-surface-dark);
  color: var(--color-on-dark-soft);
  padding: 56px 0 32px;
  margin-top: 48px;
}

.footer-heading {
  color: var(--color-on-dark);
  font-size: 20px;
  margin-bottom: 12px;
}

.footer-subheading {
  color: var(--color-on-dark);
  font-size: 15px;
  margin-bottom: 12px;
}

.footer-text {
  font-size: 14px;
  color: var(--color-on-dark-soft);
  line-height: 1.6;
}

.footer-disclaimer {
  font-size: 12px;
  color: #7d7d84;
}

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

.footer-list li { margin-bottom: 8px; }

.footer-list a {
  color: var(--color-on-dark-soft);
  font-size: 14px;
}

.footer-list a:hover { color: var(--color-on-dark); }

.footer-bottom {
  border-top: 1px solid #2a2a2a;
  margin-top: 40px;
  padding-top: 24px;
}

.footer-copy {
  font-size: 13px;
  color: var(--color-muted-soft);
  margin-bottom: 0;
}

.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--color-surface-dark);
  color: var(--color-on-dark-soft);
  padding: 16px 0;
  z-index: 1000;
  box-shadow: 0 -4px 12px rgba(0,0,0,0.15);
}

.cookie-banner-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.cookie-banner p { margin: 0; font-size: 14px; max-width: 720px; }

.cookie-banner-actions { display: flex; gap: 12px; flex-shrink: 0; }

.form-label { font-weight: 500; font-size: 14px; color: var(--color-ink); }

.form-control {
  border-radius: var(--radius-md);
  border-color: var(--color-hairline);
  padding: 10px 14px;
  font-size: 15px;
}

.form-control:focus {
  border-color: var(--color-ink);
  box-shadow: none;
}

.form-feedback-success {
  background-color: #ecfdf5;
  border: 1px solid #10b981;
  color: #065f46;
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-top: 16px;
}

.disclaimer-box {
  background-color: var(--color-surface-soft);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  font-size: 14px;
  color: var(--color-muted);
  margin: 24px 0;
}

@media (max-width: 900px) {
  .layout-with-sidebar { flex-direction: column; }
  .layout-sidebar { width: 100%; position: static; }
}

@media (max-width: 576px) {
  h1 { font-size: 32px; }
  h2 { font-size: 24px; }
  .hero-band { padding: 40px 0; }
}