/* ============================================================
   Daedalus blog — editorial/article styles
   Loaded after /website/styles.css on every blog article page.
   ============================================================ */

/* ---------- Article hero ---------- */
.bg-hero {
  position: relative;
  padding: 88px 0 56px;
  border-bottom: 1px solid var(--border-subtle);
  background:
    radial-gradient(ellipse at 85% 15%, rgba(255,181,71,0.10), transparent 55%),
    radial-gradient(ellipse at 10% 90%, rgba(61,216,232,0.08), transparent 60%);
  overflow: hidden;
}
.bg-hero::before {
  content: '';
  position: absolute; inset: 0;
  background-image:
    linear-gradient(0deg, rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: radial-gradient(ellipse at center, #000, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, #000, transparent 75%);
}
.bg-hero-inner {
  position: relative;
  max-width: 760px;
}
.bg-crumbs {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-3);
  display: flex;
  gap: 10px;
  align-items: center;
}
.bg-crumbs a { color: var(--fg-3); }
.bg-crumbs a:hover { color: var(--brand-cyan); }
.bg-crumbs span { color: var(--fg-4); }
.bg-tag {
  display: inline-block;
  margin-top: 16px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--brand-cyan);
  background: rgba(61,216,232,0.10);
  border: 1px solid var(--border-cyan);
  border-radius: var(--radius-pill);
}
.bg-hero h1 {
  font-size: clamp(38px, 4.6vw, 56px);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.05;
  margin-top: 14px;
  text-wrap: balance;
}
.bg-hero h1 em { font-style: italic; color: var(--brand-amber); }
.bg-dek {
  margin-top: 16px;
  font-size: 18px;
  color: var(--fg-2);
  line-height: 1.55;
  text-wrap: pretty;
}
.bg-byline {
  margin-top: 28px;
  display: flex;
  gap: 16px;
  align-items: center;
  font-size: 13px;
  color: var(--fg-3);
}
.bg-byline strong { color: var(--fg-1); font-weight: 600; }
.bg-byline .avatar {
  width: 36px; height: 36px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--brand-cyan), var(--brand-amber));
  display: grid; place-items: center;
  color: var(--surface-0);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
}
.bg-byline .dot { color: var(--fg-4); }

/* ---------- Layout: side-TOC + body ---------- */
.bg-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 64px;
  padding: 64px 0 96px;
  align-items: start;
}
.bg-toc {
  position: sticky;
  top: 96px;
  font-size: 13px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.bg-toc-h {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-4);
  margin-bottom: 10px;
}
.bg-toc a {
  padding: 6px 12px;
  border-left: 2px solid var(--border-subtle);
  color: var(--fg-3);
  line-height: 1.4;
  transition: all var(--dur-state) var(--ease-out);
}
.bg-toc a:hover { color: var(--fg-1); border-left-color: var(--fg-2); }
.bg-toc a.is-active { color: var(--brand-cyan); border-left-color: var(--brand-cyan); }
.bg-toc-sub { padding-left: 18px !important; font-size: 12px; }

/* ---------- Body prose ---------- */
.bg-prose {
  max-width: 720px;
  font-size: 17px;
  line-height: 1.65;
  color: var(--fg-1);
}
.bg-prose > * + * { margin-top: 1em; }
.bg-prose h2 {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.2;
  margin-top: 2em;
  scroll-margin-top: 96px;
}
.bg-prose h3 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.3;
  margin-top: 1.6em;
  scroll-margin-top: 96px;
}
.bg-prose p { text-wrap: pretty; color: var(--fg-2); }
.bg-prose strong { color: var(--fg-1); font-weight: 600; }
.bg-prose em { font-style: italic; color: var(--fg-1); }
.bg-prose a { color: var(--brand-cyan); border-bottom: 1px solid rgba(61,216,232,0.3); }
.bg-prose a:hover { border-bottom-color: var(--brand-cyan); }
.bg-prose ul, .bg-prose ol {
  padding-left: 24px;
  color: var(--fg-2);
}
.bg-prose li + li { margin-top: 6px; }
.bg-prose code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--surface-2);
  color: var(--brand-cyan);
  border: 1px solid var(--border-subtle);
}

/* Callouts */
.bg-callout {
  margin-top: 1.5em;
  padding: 20px 22px;
  background: var(--surface-1);
  border: 1px solid var(--border-subtle);
  border-left: 3px solid var(--brand-cyan);
  border-radius: var(--radius-md);
}
.bg-callout.is-amber { border-left-color: var(--brand-amber); }
.bg-callout.is-warn { border-left-color: #FF6B6B; }
.bg-callout-h {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--brand-cyan);
  margin-bottom: 6px;
}
.bg-callout.is-amber .bg-callout-h { color: var(--brand-amber); }
.bg-callout.is-warn .bg-callout-h { color: #FF6B6B; }
.bg-callout p { font-size: 15px; line-height: 1.55; }

/* Citation */
.bg-cite {
  display: inline-block;
  margin-left: 4px;
  padding: 1px 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  background: var(--surface-2);
  color: var(--fg-3);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  vertical-align: super;
  line-height: 1.4;
}

/* AI tutor inline chip */
.bg-ask {
  margin-top: 20px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  border-radius: var(--radius-pill);
  background: rgba(61,216,232,0.08);
  border: 1px solid var(--border-cyan);
  color: var(--brand-cyan);
  font-size: 13px;
  cursor: pointer;
  transition: all var(--dur-state) var(--ease-out);
}
.bg-ask:hover { background: rgba(61,216,232,0.14); transform: translateY(-1px); }
.bg-ask svg { width: 14px; height: 14px; }

/* Tables */
.bg-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1.5em;
  font-size: 14px;
  font-feature-settings: "tnum";
}
.bg-table th, .bg-table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border-subtle);
  vertical-align: top;
}
.bg-table th {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-3);
  background: var(--surface-1);
  border-bottom: 1px solid var(--border-default);
}
.bg-table tr:hover td { background: rgba(255,255,255,0.02); }

/* Card to wrap interactive tool */
.bg-toolcard {
  margin-top: 1.5em;
  padding: 24px;
  background: var(--surface-1);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
}
.bg-toolcard textarea {
  width: 100%;
  min-height: 90px;
  padding: 14px 16px;
  background: var(--surface-0);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--fg-1);
  resize: vertical;
  line-height: 1.5;
}
.bg-toolcard textarea:focus { outline: none; border-color: var(--brand-cyan); box-shadow: 0 0 0 3px rgba(61,216,232,0.12); }
.bg-toolcard-row {
  display: flex;
  gap: 12px;
  margin-top: 14px;
  flex-wrap: wrap;
  align-items: center;
}
.bg-flag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
}
.bg-flag-dot { width: 8px; height: 8px; border-radius: 999px; }
.bg-flag.vfr { color: #3FBF6E; background: rgba(63,191,110,0.10); border: 1px solid rgba(63,191,110,0.3); }
.bg-flag.vfr .bg-flag-dot { background: #3FBF6E; }
.bg-flag.mvfr { color: #4D9CFF; background: rgba(77,156,255,0.10); border: 1px solid rgba(77,156,255,0.3); }
.bg-flag.mvfr .bg-flag-dot { background: #4D9CFF; }
.bg-flag.ifr { color: #FF6B6B; background: rgba(255,107,107,0.10); border: 1px solid rgba(255,107,107,0.3); }
.bg-flag.ifr .bg-flag-dot { background: #FF6B6B; }
.bg-flag.lifr { color: #C896E8; background: rgba(200,150,232,0.10); border: 1px solid rgba(200,150,232,0.3); }
.bg-flag.lifr .bg-flag-dot { background: #C896E8; }

/* Decoded line list */
.bg-decode {
  margin-top: 18px;
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.bg-decode-row {
  display: grid;
  grid-template-columns: 140px 1fr 80px;
  padding: 12px 16px;
  font-size: 14px;
  border-top: 1px solid var(--border-subtle);
  align-items: baseline;
}
.bg-decode-row:first-child { border-top: 0; }
.bg-decode-code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--brand-amber);
}
.bg-decode-en { color: var(--fg-1); line-height: 1.5; }
.bg-decode-ref {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--fg-4);
  text-align: right;
}

/* Cheat-sheet grid */
.bg-cheat {
  margin-top: 1.5em;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
.bg-cheat-card {
  position: relative;
  padding: 20px 22px;
  background: var(--surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 18px;
  align-items: start;
}
.bg-cheat-class {
  width: 64px; height: 64px;
  display: grid; place-items: center;
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--surface-0);
  letter-spacing: -0.02em;
}
.bg-cheat-class.A { background: #C896E8; }
.bg-cheat-class.B { background: #4D9CFF; }
.bg-cheat-class.C { background: #C896E8; color:#1a1a2e; background: rgba(200,150,232,0.85); }
.bg-cheat-class.D { background: #4D9CFF; background: rgba(77,156,255,0.85); }
.bg-cheat-class.E { background: var(--brand-cyan); color: var(--surface-0); }
.bg-cheat-class.G { background: var(--brand-amber); color: var(--surface-0); }
.bg-cheat-body { display: grid; gap: 6px; font-size: 14px; line-height: 1.5; }
.bg-cheat-name { font-size: 16px; font-weight: 600; color: var(--fg-1); }
.bg-cheat-meta { display: grid; grid-template-columns: 80px 1fr; gap: 4px 14px; font-size: 13px; color: var(--fg-2); }
.bg-cheat-meta dt { color: var(--fg-4); font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.06em; text-transform: uppercase; padding-top: 3px; }
.bg-cheat-meta dd { color: var(--fg-1); }

/* End-of-article CTA */
.bg-endcta {
  margin-top: 80px;
  padding: 40px;
  background: linear-gradient(135deg, rgba(61,216,232,0.06), rgba(255,181,71,0.04));
  border: 1px solid var(--border-cyan);
  border-radius: var(--radius-lg);
  text-align: center;
}
.bg-endcta h3 {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.015em;
  margin: 0;
}
.bg-endcta p { margin: 8px 0 22px; color: var(--fg-2); }
.bg-endcta-row { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* Related articles strip */
.bg-related {
  margin-top: 56px;
  padding-top: 32px;
  border-top: 1px solid var(--border-subtle);
}
.bg-related-h {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin-bottom: 18px;
}
.bg-related-list { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.bg-related-item {
  display: block;
  padding: 18px 20px;
  background: var(--surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: all var(--dur-state) var(--ease-out);
}
.bg-related-item:hover { border-color: var(--border-cyan); transform: translateY(-2px); }
.bg-related-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--brand-cyan);
}
.bg-related-title { font-size: 15px; font-weight: 600; margin-top: 6px; line-height: 1.3; }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .bg-layout { grid-template-columns: 1fr; gap: 32px; padding: 40px 0 64px; }
  .bg-toc { position: static; }
  .bg-decode-row { grid-template-columns: 1fr; gap: 4px; }
  .bg-decode-ref { text-align: left; }
  .bg-related-list { grid-template-columns: 1fr; }
  .bg-cheat-card { grid-template-columns: 1fr; }
  .bg-cheat-class { width: 48px; height: 48px; font-size: 22px; }
}