/* ---------------------------------------------------------
   paper-style.css, canonical Paper 1 styling, shared across
   Papers 2--6 so every paper inherits the same hero / section /
   callout / table / code / abstract / figure / gates language.

   This is a verbatim copy of the inline <style> block in
   01-attention-compression.html (with a small addendum at the
   bottom for <main>, section:first-child, and .table-wrap.wide
   used by Papers 2--6). If you change Paper 1's inline styles,
   either keep them in sync here or migrate Paper 1 to load this
   file instead.
   --------------------------------------------------------- */

:root {
  --bg:        #ffffff;
  --bg-soft:   #f9f9f8;
  --bg-code:   #f4f4f4;
  --border:    #e5e5e5;
  --text:      #1a1a1a;
  --text-soft: #5c5c5c;
  --accent:    #c0392b;
  --accent-l:  #e74c3c;
  --blue:      #2d6be4;
  --green:     #1a7a4a;
  --yellow-bg: #fffbeb;
  --blue-bg:   #eef4ff;
  --green-bg:  #edfbf3;
  --red-bg:    #fff5f5;
  --max-w:     780px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 17px; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

/* --- Nav ----------------------------------------------- */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 58px;
}
.nav-brand {
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: -0.02em;
  color: var(--text);
  text-decoration: none;
}
.nav-brand span { color: inherit; }
.nav-links { display: flex; gap: 2rem; list-style: none; }
.nav-links a {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-soft);
  text-decoration: none;
  transition: color .15s;
}
.nav-links a:hover { color: var(--text); }

/* --- Hero ----------------------------------------------- */
#hero {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 7rem 1.5rem 5rem;
  text-align: center;
}
.hero-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--red-bg);
  border: 1px solid #fac5c5;
  border-radius: 2rem;
  padding: 0.3em 0.9em;
  margin-bottom: 2rem;
}
.hero-title {
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.2rem;
}
.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-soft);
  max-width: 600px;
  margin: 0 auto 2.5rem;
  line-height: 1.65;
}
.hero-meta {
  font-size: 0.85rem;
  color: var(--text-soft);
  margin-bottom: 2.5rem;
}
.hero-meta a {
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: rgba(192, 57, 43, 0.35);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  transition: color .12s ease, text-decoration-color .12s ease;
}
.hero-meta a:hover { color: var(--accent); text-decoration-color: var(--accent); }
.hero-meta a:hover { text-decoration: underline; }
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 2.5rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}
.stat { text-align: center; }
.stat-num {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text);
}
.stat-num.good { color: var(--green); }
.stat-num.warn { color: var(--accent); }
.stat-num.info { color: #8a5b16; }
.stat-label {
  display: block;
  font-size: 0.78rem;
  color: var(--text-soft);
  font-weight: 500;
  letter-spacing: 0.02em;
}
.hero-actions { display: flex; justify-content: center; gap: 1rem; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.65em 1.4em;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  transition: all .15s;
  cursor: pointer;
  border: none;
}
.btn-primary { background: var(--accent); color: white; }
.btn-primary:hover { background: #a93226; }
.btn-secondary { background: var(--bg-soft); border: 1px solid var(--border); color: var(--text); }
.btn-secondary:hover { background: var(--border); }

/* --- Sections ------------------------------------------- */
section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 4rem 1.5rem;
  border-top: 1px solid var(--border);
}
h2 {
  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-bottom: 1.5rem;
  line-height: 1.25;
}
h3 {
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  margin: 2.5rem 0 0.75rem;
  color: var(--text);
}
h4 {
  font-size: 1rem;
  font-weight: 600;
  margin: 1.75rem 0 0.5rem;
  color: var(--text);
}
p { margin-bottom: 1.2rem; color: var(--text); }
p:last-child { margin-bottom: 0; }

/* --- Cohesive link styling ---------------------------
   Body links inherit the prose color and carry only a thin, subtle
   underline; on hover they pick up the site's accent. This avoids
   the harsh blue and keeps academic prose calm. */
a {
  color: inherit;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-decoration-color: rgba(192, 57, 43, 0.35);
  text-underline-offset: 0.18em;
  transition: color .12s ease, text-decoration-color .12s ease;
}
a:hover, a:focus-visible {
  color: var(--accent);
  text-decoration-color: var(--accent);
}
a:visited { color: inherit; }
a[href^="#"] { text-decoration-style: dotted; }

/* External-link affordance: a tiny arrow after URLs that leave the page. */
a[href^="http"]::after {
  content: " \2197";
  font-size: 0.78em;
  color: var(--text-soft);
  vertical-align: 0.15em;
  margin-left: 0.05em;
}
a[href^="http"]:hover::after { color: var(--accent); }

/* --- Link preview tooltip (driven by reader.js) ------- */
#ht-link-preview {
  position: fixed;
  z-index: 9999;
  max-width: 380px;
  min-width: 220px;
  padding: 0.7rem 0.85rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 8px 28px rgba(0,0,0,0.12);
  font-size: 0.84rem;
  line-height: 1.45;
  color: var(--text);
  pointer-events: none;
  opacity: 0;
  transform: translateY(-2px);
  transition: opacity .12s ease, transform .12s ease;
}
#ht-link-preview[data-open="1"] {
  opacity: 1;
  transform: translateY(0);
}
#ht-link-preview .ht-lp-label {
  display: block;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-soft);
  margin-bottom: 0.3rem;
}
#ht-link-preview .ht-lp-title {
  display: block;
  font-weight: 600;
  margin-bottom: 0.3rem;
  color: var(--text);
}
#ht-link-preview .ht-lp-snippet {
  color: var(--text-soft);
  font-size: 0.82rem;
}

/* --- Callout boxes ------------------------------------- */
.callout {
  border-left: 3px solid;
  border-radius: 0 8px 8px 0;
  padding: 1.1rem 1.4rem;
  margin: 2rem 0;
  font-size: 0.95rem;
}
.callout-title {
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}
.callout.intuition {
  background: var(--yellow-bg);
  border-color: #f0c040;
}
.callout.intuition .callout-title { color: #9a6e00; }
.callout.finding {
  background: var(--green-bg);
  border-color: #2ecc71;
}
.callout.finding .callout-title { color: var(--green); }
.callout.warning {
  background: var(--red-bg);
  border-color: #e74c3c;
}
.callout.warning .callout-title { color: var(--accent); }
.callout.info {
  background: var(--blue-bg);
  border-color: var(--blue);
}
.callout.info .callout-title { color: var(--blue); }

/* --- Tables --------------------------------------------- */
.table-wrap { overflow-x: auto; margin: 1.5rem 0; border-radius: 8px; border: 1px solid var(--border); }
table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
thead th {
  background: var(--bg-soft);
  font-weight: 600;
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
  font-size: 0.82rem;
  letter-spacing: 0.01em;
  color: var(--text-soft);
  text-transform: uppercase;
}
td { padding: 0.7rem 1rem; border-bottom: 1px solid var(--border); }
tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--bg-soft); }
.pass { color: var(--green); font-weight: 600; }
.fail { color: var(--accent); font-weight: 600; }
.highlight-row td { background: #fffbeb; }
td.num { font-family: 'IBM Plex Mono', monospace; font-size: 0.86rem; }
td.good { color: var(--green); font-weight: 600; }
td.warn { color: var(--accent); font-weight: 600; }

/* --- Code ----------------------------------------------- */
pre {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.2rem 1.4rem;
  overflow-x: auto;
  margin: 1.5rem 0;
  line-height: 1.55;
}
code {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.84rem;
  color: #1a1a1a;
}
p code, li code {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.1em 0.4em;
  font-size: 0.84em;
}

/* --- Math display --------------------------------------- */
.math-block {
  /* Avoid spurious horizontal scrollbars for equations that fit;
     wide equations still scale via MathJax SVG. */
  overflow-x: clip;
  padding: 0.5rem 0;
  margin: 1.5rem 0;
  text-align: center;
}
.math-block mjx-container { max-width: 100%; }

/* --- Figures ------------------------------------------- */
.figure {
  margin: 2rem 0;
  text-align: center;
}
.figure-caption {
  font-size: 0.82rem;
  color: var(--text-soft);
  margin-top: 0.75rem;
  font-style: italic;
}

/* --- ASCII art figure ---------------------------------- */
.ascii-figure {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.82rem;
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.4rem 1.6rem;
  display: inline-block;
  text-align: left;
  line-height: 1.6;
  margin: 1.5rem auto;
}

/* --- Section number ------------------------------------ */
.section-num {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  display: block;
}

/* --- Two-column grid ----------------------------------- */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; margin: 1.5rem 0; }
.grid-2 .card {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.2rem 1.4rem;
  background: var(--bg-soft);
}
.card-title { font-weight: 600; font-size: 0.95rem; margin-bottom: 0.4rem; }
.card-body { font-size: 0.88rem; color: var(--text-soft); }

/* --- Gates bar ----------------------------------------- */
.gates { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 0.9rem; margin: 1.5rem 0; }
.gate-card {
  border: 1px solid #c8f0d8;
  background: var(--green-bg);
  border-radius: 8px;
  padding: 0.9rem 1.1rem;
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
}
.gate-icon {
  font-size: 0.7rem; font-weight: 700; letter-spacing: 0.04em;
  padding: 2px 8px; border-radius: 4px;
  background: var(--green-bg); color: var(--green);
  flex-shrink: 0; line-height: 1.4;
}
.gate-text { font-size: 0.83rem; line-height: 1.45; }
.gate-label { font-weight: 600; display: block; }
.gate-value { color: var(--text-soft); }

/* --- Equation label ------------------------------------- */
.eq-row { display: flex; align-items: baseline; gap: 1rem; justify-content: center; margin: 1.5rem 0; }
.eq-num { font-size: 0.82rem; color: var(--text-soft); white-space: nowrap; }

/* --- Footer --------------------------------------------- */
footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 1.5rem;
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-soft);
}
footer a { color: var(--text-soft); }
footer strong { color: var(--text); }

/* --- Responsive ----------------------------------------- */
@media (max-width: 640px) {
  .grid-2 { grid-template-columns: 1fr; }
  .hero-stats { gap: 1.5rem; }
  nav { padding: 0 1rem; }
  .nav-links { display: none; }
  section { padding: 3rem 1.2rem; }
}

/* --- Smooth section transitions ----------------------- */
section { animation: fadeUp .4s ease both; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }

/* --- Abstract card ------------------------------------- */
.abstract-box {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 2rem 2.2rem;
  margin-bottom: 1rem;
}
.abstract-box p { font-size: 0.97rem; line-height: 1.8; }

/* TOC */
.toc { font-size: 0.88rem; }
.toc ol { padding-left: 1.4rem; }
.toc li { margin: 0.35rem 0; }
.toc a { color: var(--text-soft); text-decoration: none; }
.toc a:hover { color: var(--text); text-decoration: underline; }

/* ---------------------------------------------------------
   Addendum for Papers 2--6: they wrap their body in <main>
   and use .table-wrap.wide for figures that need to break
   out of the 780px column. Paper 1 has neither.
   --------------------------------------------------------- */
main { max-width: var(--max-w); margin: 0 auto; }
main > section:first-child { border-top: 0; }

.table-wrap.wide {
  width: min(1080px, calc(100vw - 2rem));
  max-width: none;
  margin-left: 50%;
  transform: translateX(-50%);
  position: relative;
}
@media (max-width: 880px) {
  .table-wrap.wide { width: 100%; transform: none; margin-left: 0; }
}