/* Alcubierre Boundary-Mode site — shared stylesheet
 * Visual language adapted from f:/science-projects/3body/website/
 * (terminal/phosphor; CRT scanline overlay; mono+serif typography).
 * Palette shifted from 3body's green-phosphor to a cooler cyan/violet
 * to distinguish projects at-a-glance.
 */

:root, [data-theme="dark"] {
  --bg-deep:        #0a0c10;
  --bg-panel:       #0f1218;
  --bg-card:        #141820;
  --bg-card-hover:  #1a1f2a;
  --border:         #1e2430;
  --border-bright:  #2a3040;
  --text-primary:   #c8ccd4;
  --text-secondary: #7a8090;
  --text-dim:       #4a5060;

  /* Project accent: cyan-amber (warp drive coloured); violet for quantum/Casimir */
  --accent:         #4ac8e8;          /* primary cyan */
  --accent-dim:     #1a5a6e;
  --accent-glow:    rgba(74, 200, 232, 0.15);
  --warm:           #f0a030;          /* amber for partials / cautions */
  --warm-dim:       #7a5018;
  --warm-glow:      rgba(240, 160, 48, 0.12);
  --neg:            #e05555;          /* red for null / no-go findings */
  --neg-dim:        #7a2a2a;
  --pos:            #3ddc84;          /* green for closed / passing */
  --pos-dim:        #1a6e3a;
  --quantum:        #a07ae0;          /* violet for Path 2B */

  --scanline:       rgba(0,0,0,0.03);
  --code-bg:        rgba(255,255,255,0.04);
  --reopening-bg:   rgba(74, 200, 232, 0.04);
  --phase-detail-bg:rgba(0, 0, 0, 0.18);
  --row-hairline:   rgba(255,255,255,0.025);

  --mono:  'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --serif: 'Source Serif 4', Georgia, serif;
}

/* Light theme — same hue family, inverted lightness, contrast-checked links */
[data-theme="light"] {
  --bg-deep:        #f4f1ea;          /* warm paper */
  --bg-panel:       #ebe7de;
  --bg-card:        #ffffff;
  --bg-card-hover:  #f7f4ec;
  --border:         #d8d2c4;
  --border-bright:  #b8b0a0;
  --text-primary:   #1a1d22;
  --text-secondary: #4a5260;
  --text-dim:       #7a8090;

  --accent:         #0f6a85;          /* darker cyan, AA on paper */
  --accent-dim:     #8ec5d8;
  --accent-glow:    rgba(15, 106, 133, 0.10);
  --warm:           #a35a00;          /* darker amber */
  --warm-dim:       #d8b070;
  --warm-glow:      rgba(163, 90, 0, 0.08);
  --neg:            #b03030;          /* darker red */
  --neg-dim:        #d89090;
  --pos:            #1a7a3a;          /* darker green */
  --pos-dim:        #8ec79e;
  --quantum:        #6038b0;          /* darker violet */

  --scanline:       rgba(0,0,0,0.015);
  --code-bg:        rgba(0,0,0,0.05);
  --reopening-bg:   rgba(15, 106, 133, 0.06);
  --phase-detail-bg:rgba(0, 0, 0, 0.025);
  --row-hairline:   rgba(0,0,0,0.04);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 14px; scroll-behavior: smooth; }

body {
  background: var(--bg-deep);
  color: var(--text-primary);
  font-family: var(--mono);
  font-weight: 400;
  line-height: 1.6;
  min-height: 100vh;
}

body::before {
  content: '';
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: repeating-linear-gradient(0deg, transparent, transparent 2px, var(--scanline) 2px, var(--scanline) 4px);
  pointer-events: none;
  z-index: 9999;
}

/* ───── Topbar ───── */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.6rem 2rem;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  font-size: 0.72rem;
}
.topbar-left { display: flex; align-items: center; gap: 1.1rem; flex-wrap: wrap; }
.topbar-left a {
  color: var(--text-secondary); text-decoration: none;
  text-transform: uppercase; letter-spacing: 0.08em; transition: color 0.2s;
}
.topbar-left a:hover { color: var(--accent); }
.topbar-left a.active { color: var(--accent); border-bottom: 1px solid var(--accent); }
.topbar-right { color: var(--text-dim); display: flex; align-items: center; gap: 0.8rem; }
.topbar-right a { color: var(--text-dim); transition: color 0.2s; }
.topbar-right a:hover { color: var(--accent); }
.topbar-right .gh-icon { width: 16px; height: 16px; fill: currentColor; vertical-align: middle; }

/* Theme toggle button (injected by assets/theme.js) */
.theme-toggle {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.25rem 0.6rem;
  border-radius: 3px;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}
.theme-toggle:hover { color: var(--accent); border-color: var(--accent-dim); }

/* ───── Hero ───── */
.hero {
  text-align: center;
  padding: 5rem 2rem 4rem;
  background: linear-gradient(180deg, var(--bg-panel) 0%, var(--bg-deep) 100%);
  border-bottom: 1px solid var(--border);
  position: relative;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -1px; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-dim), transparent);
}
.hero-label {
  font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.15em;
  color: var(--text-dim); margin-bottom: 1.5rem;
}
.hero-formula {
  font-size: 2.4rem; font-weight: 700;
  color: var(--accent);
  text-shadow: 0 0 40px var(--accent-glow), 0 0 80px rgba(74,200,232,0.06);
  font-family: var(--mono); letter-spacing: 0.05em; margin-bottom: 0.5rem;
}
.hero-formula .dim   { color: var(--text-dim); font-weight: 300; }
.hero-formula .equals{ color: var(--text-secondary); font-weight: 300; }
.hero-subtitle {
  font-family: var(--serif);
  font-size: 1.2rem; font-weight: 400;
  color: var(--text-secondary);
  max-width: 760px; margin: 1rem auto 0;
  line-height: 1.6;
}
.hero-subtitle em { color: var(--text-primary); font-style: normal; font-weight: 600; }
.hero-tagline {
  margin-top: 1.2rem;
  font-size: 0.74rem;
  color: var(--text-dim);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ───── Layout ───── */
.container { max-width: 1000px; margin: 0 auto; padding: 0 2rem; }

.block {
  padding: 3rem 0;
  border-bottom: 1px solid var(--border);
}
.block:last-child { border-bottom: none; }

.block-title {
  font-family: var(--serif);
  font-size: 1.15rem; font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
}

.block-eyebrow {
  font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.12em;
  color: var(--text-dim); margin-bottom: 0.5rem;
}

/* ───── Page header (non-hero pages) ───── */
.page-header {
  padding: 1.8rem 2rem 1rem;
  border-bottom: 1px solid var(--border);
  max-width: 1000px; margin: 0 auto;
}
.page-header h1 {
  font-family: var(--serif); font-size: 1.6rem; font-weight: 600;
  color: var(--text-primary); margin-bottom: 0.25rem;
}
.page-header h1 .dim { color: var(--text-secondary); font-weight: 300; }
.page-header .subtitle { color: var(--text-secondary); font-size: 0.78rem; }

/* ───── Stat row ───── */
.stat-row {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 1rem; margin-bottom: 0;
}
.stat-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 4px; padding: 1.2rem 1.4rem; text-align: center;
  transition: border-color 0.2s;
}
.stat-card:hover { border-color: var(--border-bright); }
.stat-card .label {
  font-size: 0.66rem; text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--text-secondary); margin-bottom: 0.4rem;
}
.stat-card .value { font-size: 1.7rem; font-weight: 700; line-height: 1.1; }
.stat-card .sub   { font-size: 0.7rem; color: var(--text-secondary); margin-top: 0.3rem; }
.val-cyan  { color: var(--accent); }
.val-pos   { color: var(--pos); }
.val-warm  { color: var(--warm); }
.val-neg   { color: var(--neg); }
.val-quant { color: var(--quantum); }

/* ───── Content cards ───── */
.card-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem;
}
.card-grid.tri { grid-template-columns: repeat(3, 1fr); }
.content-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 4px; padding: 1.5rem;
  transition: border-color 0.2s;
}
.content-card:hover { border-color: var(--border-bright); }
.content-card h3 {
  font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.08em;
  margin-bottom: 0.8rem; color: var(--accent);
}
.content-card h3.warm  { color: var(--warm); }
.content-card h3.pos   { color: var(--pos); }
.content-card h3.neg   { color: var(--neg); }
.content-card h3.quant { color: var(--quantum); }
.content-card p {
  font-size: 0.85rem; color: var(--text-secondary); line-height: 1.7;
}
.content-card p + p { margin-top: 0.7rem; }
.content-card .highlight { font-weight: 600; color: var(--text-primary); }
.content-card .pos   { color: var(--pos);   font-weight: 600; }
.content-card .neg   { color: var(--neg);   font-weight: 600; }
.content-card .warm  { color: var(--warm);  font-weight: 600; }
.content-card .accent{ color: var(--accent);font-weight: 600; }
.content-card code   {
  font-family: var(--mono); font-size: 0.78rem;
  background: var(--code-bg); padding: 0.05em 0.35em; border-radius: 2px;
}
.content-card a {
  color: var(--accent); text-decoration: none;
  border-bottom: 1px dotted var(--accent-dim);
}
.content-card a:hover { border-bottom-style: solid; }

/* ───── Tables ───── */
.data-table {
  width: 100%; border-collapse: collapse;
  font-size: 0.82rem; margin-top: 1rem;
}
.data-table th {
  text-align: left;
  color: var(--text-dim); font-weight: 500;
  font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.06em;
  padding: 0.55rem 0.8rem; border-bottom: 1px solid var(--border);
}
.data-table td {
  padding: 0.55rem 0.8rem;
  border-bottom: 1px solid var(--row-hairline);
  color: var(--text-secondary);
}
.data-table a {
  color: var(--accent); text-decoration: none;
  border-bottom: 1px dotted var(--accent-dim);
}
.data-table a:hover { border-bottom-style: solid; color: var(--pos); }
.data-table td.num   { font-family: var(--mono); }
.data-table .pos     { color: var(--pos);   font-weight: 600; }
.data-table .neg     { color: var(--neg);   font-weight: 600; }
.data-table .warm    { color: var(--warm);  font-weight: 600; }
.data-table .accent  { color: var(--accent);font-weight: 600; }
.data-table .quant   { color: var(--quantum);font-weight: 600; }
.data-table .dim     { color: var(--text-dim); }

/* ───── Image gallery (figure grid) ───── */
.image-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.4rem;
  margin: 1.5rem 0;
}
.image-gallery figure {
  margin: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: border-color 0.18s ease, transform 0.18s ease;
}
.image-gallery figure:hover {
  border-color: var(--accent-dim);
  transform: translateY(-2px);
}
.image-gallery figure a {
  display: block;
  border: none;
  background: #ffffff;          /* matplotlib PNG background */
}
.image-gallery img {
  display: block;
  width: 100%;
  height: auto;
}
.image-gallery figcaption {
  padding: 0.7rem 0.9rem 0.85rem;
  font-family: var(--serif);
  font-size: 0.88rem;
  line-height: 1.45;
  color: var(--text-secondary);
  border-top: 1px solid var(--border);
}
.image-gallery figcaption .scope {
  display: block;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: 0.35rem;
  letter-spacing: 0.02em;
}
.image-gallery figcaption strong {
  color: var(--text-primary);
}

/* Wider variant for hero / full-width figures */
.image-gallery.gallery-wide {
  grid-template-columns: repeat(auto-fit, minmax(480px, 1fr));
}
.image-gallery.gallery-single {
  grid-template-columns: 1fr;
  max-width: 960px;
  margin-left: auto;
  margin-right: auto;
}

/* ───── Callout ───── */
.callout {
  background: var(--bg-card);
  border-left: 3px solid var(--quantum);
  border-radius: 0 4px 4px 0;
  padding: 1.4rem 1.6rem;
  margin-top: 1.5rem;
}
.callout h3 {
  font-size: 0.85rem; color: var(--quantum);
  margin-bottom: 0.5rem; text-transform: uppercase; letter-spacing: 0.06em;
}
.callout.warm  { border-left-color: var(--warm);   }
.callout.warm  h3 { color: var(--warm); }
.callout.pos   { border-left-color: var(--pos);    }
.callout.pos   h3 { color: var(--pos); }
.callout.accent{ border-left-color: var(--accent); }
.callout.accent h3 { color: var(--accent); }
.callout p {
  font-size: 0.85rem; color: var(--text-secondary); line-height: 1.7;
}
.callout p + p { margin-top: 0.6rem; }

/* ───── Phase status ───── */
.phase-list { display: flex; flex-direction: column; gap: 0.5rem; }

/* Collapsible <details> phase row. Native disclosure widget; no JS. */
.phase-row {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 3px;
  font-size: 0.82rem;
  overflow: hidden;
  transition: border-color 0.2s;
}
.phase-row[open] { border-color: var(--border-bright); }
.phase-row > summary {
  display: grid;
  grid-template-columns: 24px 90px 1fr 110px;
  gap: 1rem;
  align-items: center;
  padding: 0.7rem 1rem;
  cursor: pointer;
  list-style: none;
  user-select: none;
}
.phase-row > summary::-webkit-details-marker { display: none; }
.phase-row > summary::marker { content: ''; }
.phase-row > summary:hover { background: var(--bg-card-hover); }
.phase-row > summary .chev {
  font-family: var(--mono);
  color: var(--text-dim);
  font-size: 0.85rem;
  transition: transform 0.18s ease;
  display: inline-block;
  text-align: center;
}
.phase-row[open] > summary .chev { transform: rotate(90deg); color: var(--accent); }
.phase-row .pid  { font-weight: 600; color: var(--text-primary); letter-spacing: 0.05em; }
.phase-row .desc { color: var(--text-secondary); }
.phase-row .badge {
  text-align: right; font-size: 0.7rem;
  text-transform: uppercase; letter-spacing: 0.08em;
}
.badge.done    { color: var(--pos); }
.badge.partial { color: var(--warm); }
.badge.idle    { color: var(--text-dim); }
.badge.gated   { color: var(--quantum); }

.phase-detail {
  padding: 0.2rem 1.4rem 1.2rem;
  border-top: 1px solid var(--border);
  background: var(--phase-detail-bg);
}
.phase-detail h4 {
  font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--text-dim); font-weight: 500;
  margin: 1rem 0 0.4rem;
}
.phase-detail p {
  font-family: var(--serif);
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 0.7rem;
}
.phase-detail ul { padding-left: 1.2rem; margin-bottom: 0.7rem; }
.phase-detail li {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 0.3rem;
}
.phase-detail li code { font-family: var(--mono); color: var(--text-primary); }
.phase-detail strong { color: var(--text-primary); }
.phase-detail a { color: var(--accent); text-decoration: none; border-bottom: 1px dotted var(--accent-dim); }
.phase-detail a:hover { border-bottom-style: solid; }
.phase-detail .pos   { color: var(--pos); }
.phase-detail .warm  { color: var(--warm); }
.phase-detail .neg   { color: var(--neg); }
.phase-detail .quant { color: var(--quantum); }
.phase-detail .dim   { color: var(--text-dim); }
.phase-detail .reopening {
  margin-top: 1rem;
  padding: 0.6rem 0.9rem;
  background: var(--reopening-bg);
  border-left: 2px solid var(--accent-dim);
  border-radius: 0 3px 3px 0;
  font-family: var(--mono);
  font-size: 0.76rem;
  color: var(--text-secondary);
}
.phase-detail .reopening strong { color: var(--accent); }

/* ───── Explore links ───── */
.explore-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.2rem;
}
.explore-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 4px; padding: 1.4rem;
  text-decoration: none; transition: all 0.2s; display: block;
}
.explore-card:hover {
  border-color: var(--accent-dim);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}
.explore-card .icon { font-size: 1.4rem; margin-bottom: 0.7rem; color: var(--accent); }
.explore-card h3 {
  font-size: 0.85rem; color: var(--text-primary); margin-bottom: 0.4rem;
}
.explore-card p {
  font-size: 0.74rem; color: var(--text-secondary); line-height: 1.55;
}
.explore-card .arrow {
  margin-top: 0.7rem; font-size: 0.7rem;
  color: var(--accent); text-transform: uppercase; letter-spacing: 0.1em;
}

/* ───── Prose blocks (used on detail pages) ───── */
.prose { max-width: 760px; margin: 0 auto; }
.prose h2 {
  font-family: var(--serif); font-size: 1.3rem; font-weight: 600;
  color: var(--text-primary);
  margin: 2.2rem 0 0.8rem;
}
.prose h3 {
  font-family: var(--mono); font-size: 0.78rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--accent);
  margin: 1.4rem 0 0.6rem;
}
.prose p {
  font-family: var(--serif); font-size: 1rem; color: var(--text-secondary);
  line-height: 1.75; margin-bottom: 1rem;
}
.prose p code, .prose li code {
  font-family: var(--mono); font-size: 0.85rem;
  background: var(--code-bg); padding: 0.05em 0.4em; border-radius: 2px;
  color: var(--text-primary);
}
.prose ul, .prose ol { padding-left: 1.4rem; margin-bottom: 1rem; }
.prose li {
  font-family: var(--serif); font-size: 0.95rem; color: var(--text-secondary);
  line-height: 1.7; margin-bottom: 0.4rem;
}
.prose strong { color: var(--text-primary); font-weight: 600; }
.prose em { color: var(--text-primary); font-style: italic; }
.prose a { color: var(--accent); text-decoration: none; border-bottom: 1px dotted var(--accent-dim); }
.prose a:hover { border-bottom-style: solid; }

.formula-block {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1.2rem 1.4rem;
  margin: 1rem 0 1.5rem;
  font-family: var(--mono);
  font-size: 1rem;
  color: var(--text-primary);
  text-align: center;
  letter-spacing: 0.04em;
}

/* ───── Footer ───── */
.footer {
  padding: 2rem; text-align: center;
  font-size: 0.72rem; color: var(--text-dim);
  border-top: 1px solid var(--border);
}
.footer a { color: var(--accent); text-decoration: none; }
.footer a:hover { color: var(--pos); }

/* ───── Responsive ───── */
@media (max-width: 768px) {
  .hero { padding: 3rem 1rem 2.5rem; }
  .hero-formula { font-size: 1.5rem; }
  .hero-subtitle { font-size: 1rem; }
  .stat-row { grid-template-columns: 1fr 1fr; }
  .card-grid, .card-grid.tri { grid-template-columns: 1fr; }
  .explore-grid { grid-template-columns: 1fr; }
  .container { padding: 0 1rem; }
  .phase-row > summary { grid-template-columns: 18px 60px 1fr 80px; gap: 0.5rem; font-size: 0.75rem; }
  .phase-detail { padding: 0.2rem 0.9rem 1rem; }
}

/* ───── Scrollbar ───── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb { background: var(--border-bright); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-dim); }