/* ═══════════════════════════════════════════════════════════════════
   THCA — article reading surface. Re-implements the essay template's
   existing class names (art-*, breadcrumb, lightbox, mode toggle) on
   the Terminal Prompt tokens, so article content markup is untouched.
   Load AFTER thca.css. Night mode = [data-reading="night"] on <html>.
   ═══════════════════════════════════════════════════════════════════ */

:root {
  --art-bg:      var(--ivory);
  --art-ink:     var(--ink);
  --art-ink2:    var(--ink-2);
  --art-line:    rgba(16, 27, 45, .16);
  --art-line-soft: rgba(16, 27, 45, .09);
  --art-accent:  var(--orange-ink);
  --art-surface: var(--ivory-1);
}
[data-reading="night"] {
  --art-bg:      var(--navy-950);
  --art-ink:     var(--paper);
  --art-ink2:    var(--mist);
  --art-line:    rgba(241, 237, 226, .18);
  --art-line-soft: rgba(241, 237, 226, .1);
  --art-accent:  var(--orange);
  --art-surface: var(--navy-900);
}

body.article { background: var(--art-bg); color: var(--art-ink); }

/* nav over the reading surface (day = light bar; night = navy bar) */
[data-reading="night"] .site-head.on-light,
[data-reading="night"] .site-head.scrolled {
  background: rgba(7, 15, 29, .96);
  box-shadow: 0 1px 0 var(--line-d-soft);
}
[data-reading="night"] .site-head .brand-name { color: var(--paper); }
[data-reading="night"] .site-head .brand-sub { color: var(--mist); }
[data-reading="night"] .site-head .nav-links a:not(.btn) { color: var(--mist); }
[data-reading="night"] .site-head .nav-links a:not(.btn):hover { color: var(--paper); }
[data-reading="night"] .site-head .nav-links a[aria-current="page"] { color: var(--paper); box-shadow: inset 0 -2px 0 var(--orange); }
[data-reading="night"] .site-head .nav-toggle span { background: var(--paper); }

/* ─── Article hero ───────────────────────────────────────────────── */
.art-hero { padding-top: clamp(128px, 15vh, 176px); }
.art-hero h1 { font-size: var(--t-disp); color: var(--art-ink); margin-top: 20px; max-width: 22ch; }
.art-dek { margin-top: 20px; font-size: var(--t-lead); color: var(--art-ink2); max-width: 56ch; }
.art-hero-inner > div:last-child,
.art-byline-row { margin-top: 26px; }

.breadcrumb ol {
  list-style: none; display: flex; flex-wrap: wrap; gap: .7em;
  font-family: var(--f-mono); font-size: var(--t-mono-xs); font-weight: 500;
  letter-spacing: .12em; text-transform: uppercase; color: var(--art-ink2);
}
.breadcrumb a { transition: color var(--d-1) var(--ez-out); }
.breadcrumb a:hover { color: var(--art-accent); }
.breadcrumb .crumb-sep { opacity: .45; }

.art-byline { display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; margin-top: 26px; }
.art-byline-who { display: flex; align-items: center; gap: 14px; }
.art-byline-who img { width: 46px; height: 46px; border-radius: 50%; object-fit: cover; }
.art-byline-txt { display: grid; gap: 3px; }
.art-byline-name { font-size: var(--t-sm); color: var(--art-ink); }
.art-byline-name a { color: inherit; box-shadow: inset 0 -1px 0 var(--art-line); transition: color var(--d-1) var(--ez-out); }
.art-byline-name a:hover { color: var(--art-accent); }
.meta-line {
  font-family: var(--f-mono); font-size: var(--t-mono-xs);
  letter-spacing: .08em; text-transform: uppercase; color: var(--art-ink2);
}
.meta-line .sep { opacity: .5; padding-inline: .4em; }

.mode-toggle {
  border: 1px solid var(--art-line);
  background: none; cursor: pointer;
  border-radius: var(--r-sm);
  padding: 12px 18px;
  font-family: var(--f-mono); font-size: var(--t-mono-xs); font-weight: 500;
  letter-spacing: .13em; text-transform: uppercase; color: var(--art-ink2);
  transition: color var(--d-1) var(--ez-out), border-color var(--d-1) var(--ez-out);
}
.mode-toggle:hover { color: var(--art-ink); border-color: var(--art-accent); }

/* ─── Cover + body ───────────────────────────────────────────────── */
.art-cover {
  margin-top: clamp(28px, 4vw, 46px);
  border-radius: var(--r-lg); overflow: hidden;
  border: 1px solid var(--art-line-soft);
}
.art-cover img { width: 100%; height: auto; display: block; }

.art-body {
  max-width: 686px; margin-inline: auto;
  padding-block: clamp(40px, 5vw, 64px) clamp(48px, 5vw, 72px);
  font-size: 1.125rem; line-height: 1.78;
}
.art-body p { margin-top: 1.15em; color: var(--art-ink); }
.art-body h2 {
  font-size: 1.5rem; letter-spacing: -.016em; color: var(--art-ink);
  margin-top: 2.1em;
}
.art-body ul { margin-top: 1.15em; padding-left: 1.35em; }
.art-body li { margin-top: .6em; color: var(--art-ink); }
.art-body li::marker { color: var(--art-accent); }
.art-body strong { font-weight: 650; }
.art-body a { color: var(--art-accent); box-shadow: inset 0 -1px 0 currentColor; }
.art-body a:hover { color: var(--orange-ink); }
[data-reading="night"] .art-body a:hover { color: #FF7A33; }

.art-summary {
  background: var(--art-surface);
  border: 1px solid var(--art-line-soft);
  border-left: 3px solid var(--art-accent);
  border-radius: var(--r-md);
  padding: 20px 24px 22px;
}
.art-summary .label {
  display: block; margin-bottom: 8px;
  font-family: var(--f-mono); font-size: var(--t-mono-xs); font-weight: 500;
  letter-spacing: .16em; text-transform: uppercase; color: var(--art-accent);
}
.art-summary p { margin-top: 0; font-size: 1rem; line-height: 1.7; color: var(--art-ink2); }

.art-figure { margin-top: 2em; }
.art-figure img {
  width: 100%; height: auto; display: block;
  border-radius: var(--r-md);
  border: 1px solid var(--art-line-soft);
}
.art-figure figcaption {
  margin-top: 10px;
  font-family: var(--f-mono); font-size: var(--t-mono-xs);
  letter-spacing: .04em; line-height: 1.7; color: var(--art-ink2);
}

.art-quote { margin-top: 2em; padding-left: 22px; border-left: 3px solid var(--art-accent); }
.art-quote p {
  margin-top: 0;
  font-size: 1.32rem; font-weight: 560; letter-spacing: -.015em; line-height: 1.45;
}

.art-source-note {
  margin-top: 2.6em; padding-top: 1.6em;
  border-top: 1px solid var(--art-line);
  font-size: .92rem; line-height: 1.75; color: var(--art-ink2);
}
.art-source-note a { color: var(--art-accent); box-shadow: none; }

.art-author {
  margin-top: 3em;
  display: flex; gap: 22px; align-items: flex-start;
  background: var(--art-surface);
  border: 1px solid var(--art-line-soft);
  border-radius: var(--r-lg);
  padding: 26px 28px;
}
.art-author img { width: 88px; height: 88px; border-radius: 50%; object-fit: cover; flex: none; }
.art-author h2 { font-size: 1.2rem; margin-top: 0; }
.art-author .role {
  display: block; margin: 5px 0 10px;
  font-family: var(--f-mono); font-size: var(--t-mono-xs); font-weight: 500;
  letter-spacing: .13em; text-transform: uppercase; color: var(--art-accent);
}
.art-author p { margin-top: 0; font-size: .96rem; line-height: 1.7; color: var(--art-ink2); }

/* ─── Related ────────────────────────────────────────────────────── */
.section-label {
  font-family: var(--f-mono); font-size: var(--t-mono-xs); font-weight: 500;
  letter-spacing: .16em; text-transform: uppercase; color: var(--art-accent);
}
.art-related {
  max-width: 686px; margin-inline: auto;
  padding-block: clamp(36px, 4vw, 56px);
  border-top: 1px solid var(--art-line);
}
.art-related h2 { color: var(--art-ink); margin-top: 14px; }
.art-related-list { list-style: none; margin-top: 18px; border-top: 1px solid var(--art-line-soft); }
.art-related-list li a {
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  padding: 18px 6px;
  border-bottom: 1px solid var(--art-line-soft);
  transition: background-color var(--d-1) var(--ez-out);
}
.art-related-list .r-cat {
  display: block; margin-bottom: 6px;
  font-family: var(--f-mono); font-size: var(--t-mono-xs); font-weight: 500;
  letter-spacing: .13em; text-transform: uppercase; color: var(--art-accent);
}
.art-related-list h3 { font-size: 1.08rem; color: var(--art-ink); transition: color var(--d-1) var(--ez-out); }
.art-related-list .arw { font-family: var(--f-mono); font-weight: 700; color: var(--art-accent); transition: transform var(--d-2) var(--ez-out); }
.art-related-list a:hover h3 { color: var(--art-accent); }
.art-related-list a:hover .arw { transform: translateX(5px); }

.read-link {
  display: inline-flex; align-items: center; gap: .5em;
  font-family: var(--f-mono); font-size: var(--t-mono-xs); font-weight: 500;
  letter-spacing: .12em; text-transform: uppercase; color: var(--art-accent);
  padding-block: 8px;
}
.read-link .arw { font-weight: 700; transition: transform var(--d-2) var(--ez-out); }
.read-link:hover .arw { transform: translateX(4px); }

/* ─── Image lightbox ─────────────────────────────────────────────── */
.zoom-btn {
  display: block; width: 100%;
  border: 0; padding: 0; background: none;
  cursor: zoom-in; position: relative;
  border-radius: inherit;
}
.zoom-hint {
  position: absolute; right: 10px; bottom: 10px;
  font-family: var(--f-mono); font-size: var(--t-mono-xs); letter-spacing: .1em;
  text-transform: uppercase;
  background: rgba(7, 15, 29, .78); color: var(--paper);
  padding: 5px 9px; border-radius: 6px;
  opacity: 0; transition: opacity var(--d-1) var(--ez-out);
  pointer-events: none;
}
.zoom-btn:hover .zoom-hint, .zoom-btn:focus-visible .zoom-hint { opacity: 1; }
.lb { border: 0; padding: 0; background: transparent; max-width: none; }
.lb::backdrop { background: rgba(7, 15, 29, .88); }
.lb-stage { display: grid; gap: 12px; justify-items: center; padding: 8px; }
.lb-img { max-width: min(1040px, 92vw); max-height: 80vh; width: auto; height: auto; border-radius: var(--r-md); }
.lb-cap {
  font-family: var(--f-mono); font-size: var(--t-mono-xs);
  letter-spacing: .05em; color: var(--mist); text-align: center; max-width: 70ch;
}
.lb-close {
  display: block; margin: 0 0 10px auto;
  border: 1px solid var(--line-d); background: rgba(7, 15, 29, .6);
  color: var(--paper); cursor: pointer;
  border-radius: var(--r-sm); padding: 10px 16px;
  font-family: var(--f-mono); font-size: var(--t-mono-xs); font-weight: 500;
  letter-spacing: .13em; text-transform: uppercase;
}
.lb-close:hover { border-color: var(--orange); color: var(--orange); }

@media (max-width: 680px) {
  .art-author { flex-direction: column; }
  .art-byline { align-items: flex-start; }
}

/* ─── cover placeholder + in-article FAQ (SEO build) ─────────────── */
.art-cover-slot {
  margin-top: clamp(28px, 4vw, 46px);
  border: 1px dashed var(--art-line);
  border-radius: var(--r-lg);
  background: var(--art-surface);
  padding: clamp(24px, 4vw, 44px);
  display: grid; gap: 10px;
}
.art-cover-slot .t1 { font-family: var(--f-mono); font-size: var(--t-mono); font-weight: 500; letter-spacing: .1em; text-transform: uppercase; color: var(--art-ink); }
.art-cover-slot .t1 .chev { color: var(--art-accent); }
.art-cover-slot .t2 { font-family: var(--f-mono); font-size: var(--t-mono-xs); letter-spacing: .05em; color: var(--art-ink2); }
.art-cover-slot .prompt { font-size: .92rem; line-height: 1.7; color: var(--art-ink2); max-width: 80ch; }
.art-faq { max-width: 686px; margin-inline: auto; padding-bottom: clamp(36px, 4vw, 56px); }
.art-faq h2 { color: var(--art-ink); margin: 12px 0 4px; }
.art-faq details { border-bottom: 1px solid var(--art-line-soft); }
.art-faq summary { cursor: pointer; list-style: none; display: grid; grid-template-columns: minmax(0,1fr) auto; gap: 16px; align-items: center; padding: 16px 4px; font-weight: 640; color: var(--art-ink); }
.art-faq summary::-webkit-details-marker { display: none; }
.art-faq summary .fmark { font-family: var(--f-mono); font-weight: 700; color: var(--art-accent); transition: transform var(--d-2) var(--ez-out); }
.art-faq details[open] summary .fmark { transform: rotate(90deg); }
.art-faq .faq-a { padding: 0 4px 18px; color: var(--art-ink2); }