/* ==================================================================
   FISSION: A TECHNICAL HISTORY — fission.css
   Page-specific styles on top of ../../styles.css. Shares tokens
   (--gold, --surface, --border, --s-*, etc.) so colors stay
   consistent with the rest of Rycode.

   WHY THIS FILE EXISTS
   --------------------
   The research paper reuses patterns from the SaaSpocalypse page
   (case-hero, kpi-grid, risk-pill), but adds long-read features
   that don't live anywhere else on the site yet: footnote links,
   a sticky section nav, typeset data tables, an equation block,
   and a print stylesheet for the browser "Save as PDF" workflow.

   TABLE OF CONTENTS
   -----------------
   1. HERO          (case-hero, title, lede, meta, cta, back-link)
   2. RISK PILL     (Technical History · 2026 chip)
   3. KPI TILES     (three anchor stats under "At a glance")
   4. CONTENTS LIST (five-part jump list on the main flow)
   5. SECTION NAV   (sticky sidebar — desktop only, scroll-spy)
   6. PROSE         (case-body / case-prose / subhead / microhead)
   7. LISTS         (case-list bullets with gold rails)
   8. DATA TABLES   (six tables across the paper)
   9. EQUATION      (E = mc² display block)
  10. ANATOMY CALLOUT  (crosslink to the upcoming Anatomy page)
  11. FOOTNOTES    (sup.fn links in the prose)
  12. REFERENCES   (the numbered list at the bottom)
  13. PRINT        (browser print-to-PDF styling)
  14. RESPONSIVE   (breakpoints + reduced-motion)
   ================================================================== */


/* ==================================================================
   1. HERO
   Same visual language as /projects/grc/ and SaaSpocalypse: soft
   radial gold glow in the background, oversized gradient-clipped
   title, short back-link above, meta row below.
   ================================================================== */
.case-hero {
  position: relative;
  padding: var(--s-9) 0 var(--s-7);
  overflow: hidden;
  isolation: isolate;
}
.case-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(50% 40% at 20% 10%, rgba(255, 181, 71, 0.10), transparent 70%),
    radial-gradient(40% 30% at 90% 0%,  rgba(212, 168, 75, 0.08), transparent 70%);
}

.back-link {
  font-family: var(--font-mono);
  color: var(--text-muted);
  text-decoration: none;
  text-transform: none;
  letter-spacing: 0;
}
.back-link:hover { color: var(--gold); }

.case-title {
  font-size: clamp(2.5rem, 7vw, 5rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1;
  margin: var(--s-4) 0 var(--s-5);
  background: linear-gradient(180deg, #ffffff 0%, #a8a8a8 100%);
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
}

.case-lede {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 70ch;
  line-height: 1.55;
  margin: 0 0 var(--s-6);
}

.case-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-3);
}

.case-meta {
  display: inline-flex;
  align-items: center;
  gap: var(--s-3);
  margin-top: var(--s-5);
  flex-wrap: wrap;
}


/* ==================================================================
   2. RISK PILL
   Small chip next to the status — "Technical History · 2026". Same
   shape as the SaaSpocalypse Emerging Risk pill so the two research
   entries feel like siblings.
   ================================================================== */
.risk-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5ch;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: var(--fs-tiny);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--gold);
  background: rgba(212, 168, 75, 0.08);
  border: 1px solid rgba(212, 168, 75, 0.35);
  white-space: nowrap;
}


/* ==================================================================
   3. KPI TILES
   Three anchor stats under "At a glance". Same structure as
   SaaSpocalypse; this page uses one .is-loss tile to flag the
   arms-control vacuum (the rising-risk number).
   ================================================================== */
.kpi-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-4);
  margin-top: var(--s-6);
}

.kpi-tile {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--s-5);
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
}
.kpi-tile.is-loss { border-left: 3px solid #ffb547; }   /* gold-hot for risk */

.kpi-eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-tiny);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--text-faint);
  margin: 0;
}
.kpi-value {
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  margin: 0;
  line-height: 1;
}
.kpi-tile.is-loss .kpi-value { color: #ffb547; }
.kpi-note {
  font-size: var(--fs-small);
  color: var(--text-muted);
  margin: 0;
  line-height: 1.5;
}


/* ==================================================================
   4. CONTENTS LIST
   Inline table of contents shown once at the top. Numbered roman
   prefixes (I / II / III …) sit in a fixed-width column on the
   left so the labels line up neatly.
   ================================================================== */
.contents-list {
  list-style: none;
  margin: var(--s-5) 0 0;
  padding: 0;
  display: grid;
  gap: var(--s-2);
  max-width: 48rem;
}
.contents-list li { margin: 0; }
.contents-list a {
  display: grid;
  grid-template-columns: 3rem 1fr;
  align-items: baseline;
  gap: var(--s-3);
  padding: var(--s-3) var(--s-4);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  text-decoration: none;
  color: var(--text);
  transition: border-color 160ms var(--ease), background 160ms var(--ease);
}
.contents-list a:hover,
.contents-list a:focus-visible {
  border-color: var(--border-hot);
  background: color-mix(in oklab, var(--surface) 85%, var(--gold-dim));
  color: var(--text);
}
.contents-num {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  color: var(--gold);
  letter-spacing: 0.08em;
}
.contents-label {
  font-size: 1rem;
  color: var(--text);
  line-height: 1.3;
}


/* ==================================================================
   5. SECTION NAV  (sticky sidebar)
   A second copy of the contents list, positioned as a fixed rail
   on the right side of the viewport. Hidden below 1280px because
   there's not enough horizontal room for it without overlapping
   the prose column.

   The .is-active class is added by fission.js as the reader scrolls
   past each section.
   ================================================================== */
.section-nav {
  display: none;            /* hidden by default; shown at 1280px+ */
  position: fixed;
  top: 50%;
  right: var(--s-5);
  transform: translateY(-50%);
  z-index: 5;
  padding: var(--s-4) var(--s-4);
  background: color-mix(in oklab, var(--surface) 80%, transparent);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  font-family: var(--font-mono);
  max-width: 14rem;
}
.section-nav-label {
  font-size: var(--fs-tiny);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--text-faint);
  margin: 0 0 var(--s-3);
}
.section-nav ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: var(--s-2);
}
.section-nav a {
  display: block;
  font-size: var(--fs-tiny);
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.25rem 0.5rem;
  border-left: 2px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}
.section-nav a:hover,
.section-nav a:focus-visible { color: var(--text); }
.section-nav a.is-active {
  color: var(--gold);
  border-left-color: var(--gold);
}


/* ==================================================================
   6. PROSE
   Narrower reading column for the body of the paper. Matches the
   pattern from projects/grc.css but with extra subhead tiers so
   the five-part structure is navigable.
   ================================================================== */
.case-body { max-width: 72ch; }

.case-prose p {
  color: var(--text-muted);
  font-size: 1.0625rem;
  line-height: 1.7;
  margin: 0 0 var(--s-4);
}
.case-prose p:last-child { margin-bottom: 0; }

.case-prose em {
  color: var(--text);
  font-style: italic;
}
.case-prose strong { color: var(--text); }

/* Isotope notation ( <sup>235</sup>U ) — shrink and tighten so it
   doesn't push the line-height around. */
.case-prose sup {
  font-size: 0.7em;
  line-height: 0;
  vertical-align: super;
}

.case-subhead {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
  margin: var(--s-7) 0 var(--s-4);
  line-height: 1.25;
}
/* Microhead is a smaller, mono, uppercase label used for sub-sections
   inside Part III and Part IV (e.g. "Teller–Ulam configuration",
   "Permissive Action Links"). Visually distinct from case-subhead so
   the reader can see the nesting at a glance. */
.case-microhead {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--gold);
  margin: var(--s-5) 0 var(--s-3);
}


/* ==================================================================
   7. LISTS  (case-list)
   Gold-rail bullet list inside prose — same visual as the
   report-list in saaspocalypse.css. Keeps the eye tracking the
   left edge for multi-line items.
   ================================================================== */
.case-list {
  list-style: none;
  margin: 0 0 var(--s-5);
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
}
.case-list li {
  padding-left: var(--s-4);
  border-left: 2px solid rgba(212, 168, 75, 0.35);
  color: var(--text-muted);
  font-size: 1.0625rem;
  line-height: 1.6;
}


/* ==================================================================
   8. DATA TABLES
   Six tables appear in the paper. They need to read cleanly in both
   screen and print. Uses a <figure> wrap so the <caption> can sit
   where it belongs (top, small, monospace) while the table itself
   stays full-width.
   ================================================================== */
.data-table {
  margin: var(--s-5) 0 var(--s-6);
  padding: 0;
  overflow-x: auto;       /* scroll on narrow screens instead of wrapping */
  -webkit-overflow-scrolling: touch;
}
.data-table table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--fs-small);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;       /* clip the radius against the inner cells */
}
.data-table caption {
  caption-side: top;
  text-align: left;
  font-family: var(--font-mono);
  font-size: var(--fs-tiny);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-faint);
  padding: 0 0 var(--s-3);
}
.data-table th,
.data-table td {
  padding: var(--s-3) var(--s-4);
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--border);
}
.data-table th {
  background: color-mix(in oklab, var(--surface) 70%, var(--bg));
  color: var(--text);
  font-weight: 700;
  font-size: var(--fs-tiny);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}
.data-table tbody tr:last-child td { border-bottom: 0; }
.data-table tbody tr:hover td {
  background: color-mix(in oklab, var(--surface) 92%, var(--gold-dim));
}
.data-table td { color: var(--text-muted); }
/* Right-align numeric cells in the inventory table. */
.data-table th.num,
.data-table td.num {
  text-align: right;
  font-variant-numeric: tabular-nums;
}


/* ==================================================================
   9. EQUATION BLOCK  (E = mc²)
   Single-line display for the mass–energy equivalence formula.
   Centered, serif-weight feel via the monospace stack so it feels
   like an equation rather than a sentence.
   ================================================================== */
.equation {
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  text-align: center;
  color: var(--gold);
  letter-spacing: 0.04em;
  margin: var(--s-5) 0 var(--s-6);
  padding: var(--s-5);
  background: color-mix(in oklab, var(--surface) 90%, var(--gold-dim));
  border: 1px solid var(--border-hot);
  border-radius: var(--radius-md);
}
.equation sup {
  font-size: 0.6em;
  vertical-align: super;
  line-height: 0;
}


/* ==================================================================
  10. ANATOMY CROSSLINK CALLOUT
   Lives inside Part III. Signals that the *interactive*
   component-by-component walkthrough will live in the Anatomy Of
   series once Phase 2 is built.
   ================================================================== */
.anatomy-callout {
  margin: var(--s-5) 0 var(--s-6);
  padding: var(--s-4) var(--s-5);
  background:
    radial-gradient(120% 140% at 0% 0%, rgba(255, 181, 71, 0.08), transparent 60%),
    var(--surface);
  border: 1px solid var(--border-hot);
  border-radius: var(--radius-md);
}
.anatomy-callout-eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-tiny);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--gold);
  margin: 0 0 var(--s-2);
}
.anatomy-callout-body {
  font-size: var(--fs-small);
  color: var(--text-muted);
  margin: 0;
  line-height: 1.6;
}
.anatomy-callout-body a { white-space: nowrap; }


/* ==================================================================
  11. FOOTNOTES
   Inline citations rendered as superscript numbers. Gold on hover,
   dashed underline so they're visibly linkable without fighting the
   prose. A title attribute (added by fission.js) turns into the
   browser-native tooltip with the source title.
   ================================================================== */
sup.fn {
  font-size: 0.7em;
  vertical-align: super;
  line-height: 0;
  margin-left: 0.1em;
}
sup.fn a {
  color: var(--gold);
  text-decoration: none;
  font-family: var(--font-mono);
  font-weight: 600;
  padding: 0 0.15em;
  border-bottom: 1px dotted var(--gold-dim);
  transition: color 160ms var(--ease), border-color 160ms var(--ease), background 160ms var(--ease);
}
sup.fn a:hover,
sup.fn a:focus-visible {
  color: var(--gold-hot);
  border-bottom-color: var(--gold-hot);
  background: rgba(212, 168, 75, 0.12);
  border-radius: 3px;
}

/* When the reader clicks a footnote and lands on the target <li>,
   flash the background gold-dim so it's obvious where they jumped. */
.references li:target {
  background: rgba(212, 168, 75, 0.10);
  border-left-color: var(--gold-hot);
}


/* ==================================================================
  12. REFERENCES
   Numbered bibliography at the bottom. Each <li> has id="fn-N" so
   footnotes can link straight to it.
   ================================================================== */
.references {
  counter-reset: refnum;
  list-style: none;
  padding: 0;
  margin: var(--s-5) 0 0;
  display: grid;
  gap: var(--s-2);
}
.references li {
  counter-increment: refnum;
  position: relative;
  padding: var(--s-3) var(--s-3) var(--s-3) 3.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--gold-dim);
  border-radius: var(--radius-sm);
  font-size: var(--fs-small);
  color: var(--text-muted);
  line-height: 1.5;
  scroll-margin-top: var(--s-6);  /* don't wedge against the nav on jump */
  transition: background 200ms var(--ease), border-color 200ms var(--ease);
}
.references li::before {
  content: counter(refnum);
  position: absolute;
  left: var(--s-4);
  top: var(--s-3);
  font-family: var(--font-mono);
  font-size: var(--fs-tiny);
  color: var(--gold);
  font-weight: 700;
  letter-spacing: 0.05em;
}
.references a {
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: var(--gold-dim);
  text-underline-offset: 3px;
}
.references a:hover { color: var(--gold-hot); }


/* ==================================================================
  13. PRINT  (browser "Save as PDF" workflow)
   Priorities:
     - Light background, dark text — saves ink and reads cleanly
     - Hide chrome: header nav, sticky sidebar, download button,
       skip-link, noscript banner
     - Expand tables so nothing scrolls off the page
     - Show the full URL after every link (useful in PDF)
     - Avoid splitting a table / figure across a page break
   ================================================================== */
@media print {
  @page { margin: 0.75in; }

  html, body {
    background: #ffffff !important;
    color: #111 !important;
    font-size: 11pt;
  }

  /* Kill the on-screen chrome that has no place in a PDF. */
  .site-header,
  .section-nav,
  .skip-link,
  .noscript-banner,
  .case-cta,
  .site-footer,
  .anatomy-callout {
    display: none !important;
  }

  main, .section, .case-hero {
    padding: 0 !important;
    background: none !important;
  }
  .case-hero::before { display: none; }
  .container { max-width: none; padding: 0; }

  /* Typography: solid black, no gradient text clip (prints as blank). */
  h1, h2, h3, h4, h5, h6 {
    color: #111 !important;
    background: none !important;
    -webkit-background-clip: initial !important;
            background-clip: initial !important;
    -webkit-text-fill-color: initial !important;
    page-break-after: avoid;
  }
  .case-title {
    -webkit-background-clip: initial !important;
            background-clip: initial !important;
    color: #111 !important;
    font-size: 24pt !important;
  }
  .case-lede { color: #222 !important; }
  .section-title { font-size: 16pt; }
  .case-subhead { font-size: 13pt; }
  .section-eyebrow, .kpi-eyebrow, .contents-num, .anatomy-callout-eyebrow {
    color: #555 !important;
  }

  p, li, td, th, caption {
    color: #111 !important;
  }

  /* Tiles and callouts: flat borders, no dark fills. */
  .kpi-tile,
  .contents-list a,
  .references li,
  .data-table table,
  .equation {
    background: #fff !important;
    border: 1px solid #bbb !important;
    color: #111 !important;
  }
  .kpi-value { color: #111 !important; }
  .risk-pill {
    color: #111 !important;
    background: #eee !important;
    border-color: #888 !important;
  }

  /* Tables: make sure nothing is clipped or hidden. */
  .data-table { overflow: visible !important; }
  .data-table table { page-break-inside: avoid; }
  .data-table th,
  .data-table td { border-color: #bbb !important; }
  .data-table th { background: #f3f3f3 !important; color: #111 !important; }
  .data-table tbody tr:hover td { background: none !important; }

  /* Equation: outline only. */
  .equation {
    color: #111 !important;
    background: #fafafa !important;
  }

  /* Footnotes: keep them as a clear "[N]" next to the text. */
  sup.fn a {
    color: #111 !important;
    border-bottom: 0 !important;
    background: none !important;
    text-decoration: none !important;
  }

  /* References: expose the URL so the PDF is self-contained. */
  .references a::after {
    content: " (" attr(href) ")";
    color: #555;
    font-size: 0.9em;
    word-break: break-all;
  }

  /* Don't split a figure/table across a page; keep headings with the
     following paragraph. */
  figure, .data-table, .kpi-tile, .equation, .anatomy-callout {
    page-break-inside: avoid;
  }
  .section-title, .case-subhead, .case-microhead {
    page-break-after: avoid;
  }
}


/* ==================================================================
  14. RESPONSIVE + REDUCED MOTION
   Desktop: KPI grid becomes three columns. Section nav appears at
   1280px+ (narrower screens don't have room without overlapping).
   ================================================================== */
@media (min-width: 768px) {
  .kpi-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 1280px) {
  .section-nav { display: block; }
}

@media (prefers-reduced-motion: reduce) {
  .contents-list a,
  sup.fn a,
  .section-nav a,
  .references li { transition: none; }
}