/* Accessibility Scanning — design system
   Slate blue-gray + pure white, single-column reading layout. */

:root {
  --color-primary:      #475569;
  --color-primary-dk:   #1E293B;
  --color-accent:       #334155;
  --color-surface:      #FFFFFF;
  --color-card:         #FFFFFF;
  --color-ink:          #1F2937;
  --color-ink-soft:     #64748B;
  --color-rule:         #E2E8F0;
  --color-highlight:    #F1F5F9;
  --color-highlight-br: #CBD5E1;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--color-ink);
  background: var(--color-surface);
  font-size: 16.5px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
::selection { background: rgba(71, 85, 105, 0.18); }
img { max-width: 100%; height: auto; display: block; }

a { color: var(--color-primary); }
a:hover { color: var(--color-primary-dk); }

h1, h2, h3, h4 {
  font-family: inherit;
  color: var(--color-primary-dk);
  letter-spacing: -0.01em;
}
h1 { font-size: 32px; font-weight: 700; line-height: 1.2; }
h2 { font-size: 22px; font-weight: 650; line-height: 1.3; margin-top: 48px; margin-bottom: 14px; }
h3 { font-size: 18px; font-weight: 600; line-height: 1.35; color: var(--color-primary); margin-top: 32px; margin-bottom: 10px; }
h4 { font-size: 16px; font-weight: 600; margin-top: 22px; margin-bottom: 8px; }

/* Layout */
.site-wrapper { min-height: 100vh; display: flex; flex-direction: column; }
.site-main { flex: 1; padding-bottom: 48px; }
.container {
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Header ── */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-rule);
}
.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  padding: 0 24px;
  max-width: 1080px;
  margin: 0 auto;
  gap: 24px;
}
.site-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--color-primary-dk);
  text-decoration: none;
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.site-logo:hover { color: var(--color-accent); }
.site-logo-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--color-primary);
  display: inline-block;
}
.site-nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
}
.site-nav a {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-primary-dk);
  text-decoration: none;
  padding: 6px 14px;
  transition: color 0.15s ease;
  white-space: nowrap;
}
.site-nav a:last-child { padding-right: 0; }
.site-nav a:hover { color: var(--color-primary); }
.site-nav a.current { color: var(--color-primary); }

/* ── Homepage ── */
.container--home { max-width: 840px; }
.as-home-hero {
  text-align: center;
  padding: 80px 0 24px;
}
.as-home-title {
  font-size: 42px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-primary-dk);
}
.as-home-sub {
  font-size: 18px;
  line-height: 1.6;
  color: var(--color-ink-soft);
  max-width: 560px;
  margin: 20px auto 0;
}
.as-home-topics {
  margin-top: 64px;
}
.as-home-topics-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
  font-weight: 600;
  text-align: center;
  margin: 0 0 24px;
}
.as-home-topic-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.as-home-topic-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--color-surface);
  border: 1px solid var(--color-rule);
  border-radius: 6px;
  padding: 24px 24px 22px;
  text-decoration: none;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.as-home-topic-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-1px);
}
.as-home-topic-title {
  font-size: 19px;
  font-weight: 650;
  color: var(--color-primary-dk);
  line-height: 1.3;
}
.as-home-topic-desc {
  font-size: 14.5px;
  color: var(--color-ink-soft);
  line-height: 1.55;
}
.as-home-closing {
  text-align: center;
  margin: 48px 0 16px;
  font-size: 15.5px;
  color: var(--color-ink-soft);
}
.as-home-closing a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}
@media (max-width: 680px) {
  .as-home-title { font-size: 32px; }
  .as-home-sub { font-size: 16px; }
  .as-home-hero { padding: 56px 0 16px; }
  .as-home-topic-grid { grid-template-columns: 1fr; gap: 12px; }
}

/* ── Entry header (posts + pages) ── */
.entry-header {
  padding: 56px 0 28px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--color-rule);
}
.entry-title {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-primary-dk);
  margin-bottom: 10px;
}
.entry-meta {
  font-size: 14px;
  color: var(--color-ink-soft);
  margin-top: 12px;
}

/* ── Inline breadcrumb under H1 ── */
.as-breadcrumb {
  font-size: 13px;
  color: var(--color-ink-soft);
  line-height: 1.5;
}
.as-breadcrumb a {
  color: var(--color-primary);
  text-decoration: none;
}
.as-breadcrumb a:hover { text-decoration: underline; }
.as-breadcrumb-sep {
  margin: 0 6px;
  color: var(--color-ink-soft);
}

/* ── Highlight box ── */
.as-highlight {
  background: var(--color-highlight);
  border-left: 3px solid var(--color-primary);
  padding: 18px 22px;
  margin: 0 0 36px;
  font-size: 16px;
  color: var(--color-ink);
  border-radius: 0 4px 4px 0;
  line-height: 1.65;
}
.as-highlight a { color: var(--color-primary); }
.as-highlight a:hover { color: var(--color-primary-dk); }

/* ── Entry content typography ── */
.entry-content {
  font-size: 16.5px;
  line-height: 1.72;
  color: var(--color-ink);
}
.entry-content p { margin-bottom: 22px; }
.entry-content h2 { margin-top: 48px; margin-bottom: 14px; }
.entry-content h3 { margin-top: 36px; margin-bottom: 10px; color: var(--color-primary); }
.entry-content h4 { margin-top: 24px; margin-bottom: 8px; }
.entry-content a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}
.entry-content a:hover { color: var(--color-primary-dk); }
.entry-content ul, .entry-content ol {
  margin: 0 0 22px 24px;
}
.entry-content li { margin-bottom: 6px; }
.entry-content blockquote {
  border-left: 3px solid var(--color-highlight-br);
  padding-left: 22px;
  margin: 28px 0;
  color: var(--color-primary-dk);
  font-style: italic;
}
.entry-content blockquote p { margin-bottom: 0; }

/* Tables */
.entry-content table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  margin: 28px 0;
  border: 1px solid var(--color-rule);
  border-radius: 4px;
  overflow: hidden;
}
.entry-content table thead th {
  background: var(--color-highlight);
  color: var(--color-primary-dk);
  font-size: 13px;
  font-weight: 650;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  text-align: left;
  padding: 10px 16px;
  border-bottom: 1px solid var(--color-rule);
}
.entry-content table tbody td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-rule);
  color: var(--color-ink);
  vertical-align: top;
}
.entry-content table tbody tr:last-child td { border-bottom: none; }
.entry-content table tbody td:first-child {
  font-weight: 600;
  color: var(--color-primary-dk);
}

/* ── Blog archive: hairline list ── */
.archive-header {
  padding: 56px 0 32px;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--color-rule);
}
.archive-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
  margin-bottom: 10px;
  font-weight: 600;
}
.archive-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-primary-dk);
  line-height: 1.2;
  margin-bottom: 12px;
}
.archive-description {
  font-size: 16px;
  color: var(--color-ink-soft);
  max-width: 560px;
}

.post-list {
  display: flex;
  flex-direction: column;
}
.post-card {
  padding: 32px 0;
  border-bottom: 1px solid var(--color-rule);
}
.post-card:last-child { border-bottom: none; }
.post-card-date {
  font-size: 13px;
  color: var(--color-ink-soft);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 500;
}
.post-card-title {
  font-size: 20px;
  font-weight: 650;
  line-height: 1.35;
  margin: 0 0 10px;
  color: var(--color-primary-dk);
}
.post-card-title a {
  color: var(--color-primary-dk);
  text-decoration: none;
  transition: color 0.15s ease;
}
.post-card-title a:hover { color: var(--color-primary); }
.post-card-excerpt {
  font-size: 15.5px;
  color: var(--color-ink-soft);
  line-height: 1.6;
}

.pagination {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin: 48px 0 0;
  flex-wrap: wrap;
}
.pagination a, .pagination span {
  font-size: 14px;
  padding: 7px 13px;
  border: 1px solid var(--color-rule);
  border-radius: 4px;
  color: var(--color-primary);
  text-decoration: none;
  background: var(--color-surface);
}
.pagination a:hover { border-color: var(--color-primary); }
.pagination .current {
  background: var(--color-primary);
  color: #FFFFFF;
  border-color: var(--color-primary);
}

/* ── Related reading strip ── */
.as-related {
  margin-top: 72px;
  padding-top: 40px;
  border-top: 1px solid var(--color-rule);
}
.as-related-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
  margin: 0 0 16px;
  font-weight: 600;
}
.as-related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.as-related-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--color-card);
  border: 1px solid var(--color-rule);
  border-radius: 6px;
  padding: 20px;
  text-decoration: none;
  transition: border-color 0.15s ease;
}
.as-related-card:hover {
  border-color: var(--color-primary);
}
.as-related-card-title {
  font-weight: 650;
  color: var(--color-primary-dk);
  font-size: 15.5px;
  line-height: 1.4;
}
.as-related-card-excerpt {
  font-size: 14px;
  color: var(--color-ink-soft);
  line-height: 1.55;
}

/* ── Footer ── */
.site-footer {
  background: var(--color-primary-dk);
  color: #FFFFFF;
  padding: 48px 0;
  margin-top: 96px;
  text-align: center;
}
.site-footer-inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px;
}
.footer-links {
  font-size: 15px;
}
.footer-links a {
  color: #FFFFFF;
  text-decoration: none;
  padding: 0 6px;
}
.footer-links a:hover { text-decoration: underline; }
.footer-sep {
  color: rgba(255, 255, 255, 0.45);
  margin: 0 4px;
}
.footer-copy {
  margin-top: 14px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.7);
}

/* ── Contact Form ── */
.as-form {
  max-width: 560px;
  margin: 12px 0 0;
}
.as-form-intro {
  font-size: 15.5px;
  color: var(--color-ink);
  line-height: 1.7;
  margin: 0 0 28px;
}
.as-form-success {
  background: var(--color-highlight);
  border-left: 3px solid var(--color-primary);
  padding: 18px 22px;
  color: var(--color-primary-dk);
  font-size: 15px;
  line-height: 1.6;
  margin-bottom: 24px;
  border-radius: 0 4px 4px 0;
}
.as-form-success strong {
  display: block;
  font-weight: 650;
  font-size: 16px;
  margin-bottom: 4px;
}
.as-form-error {
  background: #FEF2F2;
  border-left: 3px solid #B91C1C;
  padding: 14px 18px;
  color: #7F1D1D;
  font-size: 14px;
  margin-bottom: 20px;
  border-radius: 0 4px 4px 0;
}
.as-field { margin-bottom: 22px; }
.as-field label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary-dk);
  margin-bottom: 7px;
  letter-spacing: 0.01em;
}
.as-field input[type="text"],
.as-field input[type="email"],
.as-field input[type="number"],
.as-field textarea {
  display: block;
  width: 100%;
  padding: 11px 14px;
  font-size: 15.5px;
  font-family: inherit;
  color: var(--color-ink);
  background: var(--color-surface);
  border: 1px solid var(--color-rule);
  border-radius: 5px;
  line-height: 1.5;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  -webkit-appearance: none;
  appearance: none;
  box-sizing: border-box;
}
.as-field input[type="number"] { width: 90px; }
.as-field input:focus, .as-field textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(71, 85, 105, 0.22);
}
.as-field textarea { resize: vertical; min-height: 140px; }
.as-field-submit {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 4px;
}
.as-submit {
  background: var(--color-accent);
  color: #FFFFFF;
  border: none;
  border-radius: 5px;
  padding: 12px 26px;
  font-size: 15px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.08s ease;
  letter-spacing: 0.01em;
}
.as-submit:hover { background: var(--color-primary-dk); }
.as-submit:active { transform: scale(0.98); }
.as-submit:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(71, 85, 105, 0.28);
}
.as-form-note {
  font-size: 13px;
  color: var(--color-ink-soft);
}

/* ── Responsive ── */
@media (max-width: 720px) {
  body { font-size: 16px; }
  h1, .entry-title, .archive-title { font-size: 26px; }
  h2 { font-size: 20px; margin-top: 40px; }
  h3 { font-size: 17px; margin-top: 28px; }
  .entry-header { padding: 40px 0 24px; margin-bottom: 24px; }
  .archive-header { padding: 40px 0 24px; }
  .as-related-grid { grid-template-columns: 1fr; gap: 12px; }
  .site-header-inner { padding: 0 16px; gap: 12px; }
  .site-nav a { padding: 6px 10px; font-size: 14px; }
  .container { padding: 0 20px; }
  .as-submit { width: 100%; }
  .as-field-submit { align-items: stretch; }
}