/* =========================================================================
   multipage.css  —  Styles for the NEW multi-page build ONLY.
   Owner: Foundation/render. Plan refs: MULTIPAGE_PLAN.md §3d, §4c, §6.

   Scope (does NOT restyle anything on index.html):
     1. Domain-section headers on the projects index          (.mp-domain-*)
     2. The domain filter chip bar                            (.mp-filters / .mp-chip)
     3. Grid glue + render.js's own reveal/filter states      (.mp-grid / .mp-reveal / .mp-hidden)
     4. Per-card CTA + the "Coming soon" badge                (.mp-card-cta / .mp-view-link / .mp-soon-badge)
     5. Publication group headers on the publications index   (.mp-pub-group-*)
     6. The detail-page article layout                        (.detail-*)

   Everything keys off the EXISTING custom properties (--primary-color,
   --secondary-color, --accent-color, --bg-*, --text-*, --border-color,
   --shadow-*, --border-radius, --transition-*, accent-*-rgb) so it inherits
   light/dark theming and the live accent system for free. The .project-card /
   .publication-item cards themselves are styled by the existing CSS — this
   file only adds the surrounding page chrome.
   ========================================================================= */

/* =========================================================================
   1. DOMAIN-SECTION HEADERS  (projects index)
   Full-width band inside the single .mp-grid: icon + label + blurb.
   ========================================================================= */
.mp-domain-header {
  grid-column: 1 / -1;               /* span the whole grid row */
  display: flex;
  align-items: center;
  gap: clamp(0.85rem, 2vw, 1.15rem);
  margin: clamp(1.25rem, 3vw, 2.25rem) 0 0.35rem;
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--border-color);
}
.mp-grid > .mp-domain-header:first-child { margin-top: 0; }

.mp-domain-icon {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: clamp(42px, 6vw, 54px);
  height: clamp(42px, 6vw, 54px);
  border-radius: 16px;
  font-size: clamp(1.1rem, 2.4vw, 1.45rem);
  color: #fff;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  box-shadow: 0 10px 24px -12px color-mix(in srgb, var(--primary-color) 75%, transparent);
}

.mp-domain-heading { min-width: 0; }

.mp-domain-title {
  margin: 0;
  font-size: clamp(1.25rem, 3vw, 1.7rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.mp-domain-blurb {
  margin: 0.3rem 0 0;
  font-size: clamp(0.85rem, 1.6vw, 0.95rem);
  line-height: 1.5;
  color: var(--text-secondary);
  max-width: 66ch;
}

/* =========================================================================
   2. FILTER CHIP BAR  (projects index)
   Mirrors the single-pager's .project-filter language so it reads identical.
   ========================================================================= */
.mp-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  justify-content: center;
  margin: 0 0 clamp(1.75rem, 4vw, 2.5rem);
}

.mp-chip {
  -webkit-appearance: none;
          appearance: none;
  cursor: pointer;
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.5rem 1.05rem;
  border-radius: 999px;
  color: var(--text-secondary);
  background: color-mix(in srgb, var(--bg-secondary) 60%, transparent);
  border: 1px solid var(--border-color);
  transition: transform var(--transition-fast, 0.2s ease),
              color var(--transition-fast, 0.2s ease),
              border-color var(--transition-fast, 0.2s ease),
              background var(--transition-fast, 0.2s ease),
              box-shadow var(--transition-fast, 0.2s ease);
}
.mp-chip i { font-size: 0.82em; opacity: 0.85; }
.mp-chip:hover { transform: translateY(-2px); color: var(--text-primary); }
.mp-chip:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}
.mp-chip.is-active {
  color: #fff;
  border-color: transparent;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  box-shadow: 0 10px 22px -10px color-mix(in srgb, var(--primary-color) 70%, transparent);
}
.mp-chip.is-active i { opacity: 1; }

.mp-chip-count {
  font-size: 0.72rem;
  font-weight: 700;
  opacity: 0.7;
  padding: 0.05rem 0.4rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--text-primary) 10%, transparent);
}
.mp-chip.is-active .mp-chip-count {
  opacity: 0.95;
  background: rgba(255, 255, 255, 0.22);
}

/* =========================================================================
   3. GRID GLUE + render.js's OWN reveal / filter states
   ========================================================================= */
/* The injected grid is the existing .projects-grid; nothing to restyle there.
   Hidden state used by the filter (plain fallback + Flip enter/leave). */
.mp-hidden { display: none !important; }

/* render.js reveal — independent of reveal-motion.js (which scans at boot,
   before these cards exist). Reduced-motion collapses to an instant show. */
.mp-reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}
.mp-reveal.mp-in {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  .mp-reveal { opacity: 1; transform: none; transition: none; }
}

/* =========================================================================
   4. PER-CARD CTA + "COMING SOON" BADGE
   Sits at the bottom of .project-content on index cards.
   ========================================================================= */
.mp-card-cta {
  margin-top: 1.1rem;
  padding-top: 0.9rem;
  border-top: 1px solid color-mix(in srgb, var(--border-color) 70%, transparent);
}

.mp-view-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.5rem 1.05rem;
  border: 1.5px solid color-mix(in srgb, var(--primary-color) 42%, var(--border-color));
  border-radius: 10px;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  text-decoration: none;
  color: var(--primary-color);
  background: transparent;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}
.mp-view-link i { transition: transform var(--transition-fast, 0.2s ease); }
.mp-view-link:hover {
  background: color-mix(in srgb, var(--primary-color) 12%, transparent);
  border-color: var(--primary-color);
  transform: translateY(-1px);
}
.mp-view-link:hover i { transform: translateX(3px); }
.mp-view-link:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 3px;
  border-radius: 4px;
}

/* Non-interactive "coming soon" affordance (never a dead link). */
.mp-soon-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.32rem 0.75rem;
  border-radius: 999px;
  color: var(--text-secondary);
  background: color-mix(in srgb, var(--bg-secondary) 70%, transparent);
  border: 1px dashed color-mix(in srgb, var(--primary-color) 35%, var(--border-color));
}
.mp-soon-badge i { font-size: 0.9em; opacity: 0.8; }

/* =========================================================================
   5. PUBLICATION GROUP HEADERS  (publications index)
   ========================================================================= */
.mp-pub-group { margin-bottom: clamp(1.5rem, 4vw, 2.5rem); }

.mp-pub-group-head {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin: clamp(1rem, 3vw, 2rem) 0 1.4rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--border-color);
}
.mp-pub-group:first-child .mp-pub-group-head { margin-top: 0; }

.mp-pub-group-title {
  margin: 0;
  font-size: clamp(1.2rem, 2.8vw, 1.55rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}
.mp-pub-group-count {
  margin-left: auto;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-secondary);
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--bg-secondary) 65%, transparent);
  border: 1px solid var(--border-color);
}

/* =========================================================================
   6. DETAIL-PAGE ARTICLE LAYOUT  (hand-authored .html detail pages)
   A readable single column: hero (title / domain / status / links) ->
   metric row -> prose sections -> related items -> back-link.
   ========================================================================= */

/* The page has no hero to absorb the position:fixed navbar, so reserve room
   for it at the top (plan §4c). */
.detail-page {
  padding-top: calc(4rem + var(--safe-area-inset-top, 0px));
  padding-bottom: clamp(3rem, 8vw, 6rem);
  min-height: 100vh;
  overflow-x: hidden;            /* safety: nothing can cause a sideways scroll */
  background:
    linear-gradient(135deg, var(--bg-secondary) 0%, rgba(var(--accent-primary-rgb), 0.02) 100%),
    radial-gradient(circle at 78% 8%, rgba(var(--accent-tertiary-rgb), 0.05) 0%, transparent 45%);
}

/* Readable column with its own side gutters (detail pages don't use .container). */
.detail-article {
  width: 100%;
  max-width: 780px;
  margin: 0 auto;
  padding-inline: clamp(1.15rem, 5vw, 1.75rem);
}

/* ---- Back-link ---- */
.detail-back {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  width: fit-content;
  margin: 0 0 clamp(1.25rem, 3vw, 1.75rem);
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  font-size: 0.84rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--text-secondary);
  background: color-mix(in srgb, var(--bg-secondary) 45%, transparent);
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease, gap 0.2s ease;
}
.detail-back:hover {
  color: var(--primary-color);
  border-color: color-mix(in srgb, var(--primary-color) 50%, var(--border-color));
  background: color-mix(in srgb, var(--primary-color) 8%, transparent);
}
/* Bottom "back to all" sits on its own line, clear of the divider. */
.detail-related .detail-back { margin-bottom: 0; }
.detail-back i { transition: transform var(--transition-fast, 0.2s ease); }
.detail-back:hover i { transform: translateX(-3px); }
.detail-back:hover { color: var(--primary-color); gap: 0.7rem; }
.detail-back:hover i { transform: translateX(-3px); }

/* ---- Hero ---- */
.detail-hero {
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
}

.detail-domain-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}
.detail-domain-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.32rem 0.8rem;
  border-radius: 999px;
  text-decoration: none;
  color: var(--primary-color);
  background: color-mix(in srgb, var(--primary-color) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--primary-color) 26%, transparent);
  transition: transform var(--transition-fast, 0.2s ease), background var(--transition-fast, 0.2s ease);
}
a.detail-domain-tag:hover {
  transform: translateY(-2px);
  background: color-mix(in srgb, var(--primary-color) 18%, transparent);
}

.detail-title {
  margin: 0 0 0.9rem;
  font-size: clamp(1.7rem, 5vw, 3rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  overflow-wrap: break-word;
  word-break: break-word;
  hyphens: auto;
}

/* Status pill echoes the hero status dot from modern-ui.css. */
.detail-status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.2rem;
  padding: 0.38rem 0.9rem;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: 999px;
  color: var(--text-secondary);
  background: color-mix(in srgb, var(--accent-color) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent-color) 35%, transparent);
}
.detail-status.is-ongoing {
  color: #b45309;
  background: color-mix(in srgb, #f59e0b 14%, transparent);
  border-color: color-mix(in srgb, #f59e0b 40%, transparent);
}
[data-theme="dark"] .detail-status.is-ongoing { color: #fbbf24; }
.detail-status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #22c55e;
}
.detail-status.is-ongoing .detail-status-dot { background: #f59e0b; }

.detail-lead {
  margin: 0 0 1.6rem;
  font-size: clamp(1.05rem, 2.2vw, 1.2rem);
  line-height: 1.65;
  color: var(--text-secondary);
}

/* ---- Hero action links ---- */
.detail-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}
.detail-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.15rem;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: inherit;
  border-radius: 12px;
  cursor: pointer;
  text-decoration: none;
  color: var(--text-primary);
  background: color-mix(in srgb, var(--bg-primary) 80%, transparent);
  border: 1px solid var(--border-color);
  transition: transform 0.25s ease, box-shadow 0.25s ease,
              color 0.25s ease, background 0.25s ease, border-color 0.25s ease;
}
.detail-link:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 26px -14px color-mix(in srgb, var(--primary-color) 70%, transparent);
  border-color: color-mix(in srgb, var(--primary-color) 45%, transparent);
}
.detail-link.is-primary {
  color: #fff;
  border-color: transparent;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  box-shadow: 0 10px 24px -12px color-mix(in srgb, var(--primary-color) 70%, transparent);
}
.detail-link.is-primary:hover { filter: brightness(1.05); }

/* ---- Metric row ---- */
.detail-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(1rem, 3vw, 2rem);
  margin: clamp(1.75rem, 4vw, 2.5rem) 0;
  padding: clamp(1.25rem, 3vw, 1.75rem);
  border-radius: 20px;
  background: color-mix(in srgb, var(--bg-primary) 78%, transparent);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-light);
}
.detail-metric {
  flex: 1 1 120px;
  min-width: 110px;
}
.detail-metric-num {
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  font-weight: 800;
  line-height: 1;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
          background-clip: text;
  -webkit-text-fill-color: transparent;
}
.detail-metric-label {
  margin-top: 0.4rem;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

/* ---- Prose sections ---- */
.detail-body { margin-top: clamp(1.5rem, 4vw, 2.5rem); }

.detail-section { margin-bottom: clamp(1.75rem, 4vw, 2.75rem); }

.detail-section-title {
  margin: 0 0 0.9rem;
  font-size: clamp(1.25rem, 3vw, 1.6rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}
.detail-section-title::before {
  content: "";
  display: inline-block;
  width: 22px;
  height: 3px;
  margin-right: 0.6rem;
  vertical-align: middle;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

.detail-prose { color: var(--text-secondary); }
.detail-prose p {
  margin: 0 0 1.1rem;
  font-size: 1rem;
  line-height: 1.75;
}
.detail-prose strong { color: var(--text-primary); font-weight: 700; }
.detail-prose a {
  color: var(--primary-color);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--primary-color) 40%, transparent);
  text-underline-offset: 2px;
}
.detail-prose a:hover { text-decoration-color: var(--primary-color); }
.detail-prose ul,
.detail-prose ol {
  margin: 0 0 1.2rem;
  padding-left: 1.35rem;
  line-height: 1.7;
}
.detail-prose li { margin-bottom: 0.5rem; }
.detail-prose ul li::marker { color: var(--primary-color); }
.detail-prose code {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.88em;
  padding: 0.12em 0.4em;
  border-radius: 6px;
  background: color-mix(in srgb, var(--bg-secondary) 80%, transparent);
  border: 1px solid var(--border-color);
}
.detail-prose blockquote {
  margin: 0 0 1.2rem;
  padding: 0.6rem 0 0.6rem 1.1rem;
  border-left: 3px solid var(--primary-color);
  color: var(--text-secondary);
  font-style: italic;
}

/* Tech-tag / chip row reused inside prose (same look as card chips). */
.detail-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0.5rem 0 1.5rem;
}

/* ---- Related items ---- */
.detail-related {
  margin-top: clamp(2rem, 5vw, 3rem);
  padding-top: clamp(1.5rem, 4vw, 2.25rem);
  border-top: 1px solid var(--border-color);
}
.detail-related-title {
  margin: 0 0 1.2rem;
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}
.mp-related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 260px), 1fr));
  gap: 1rem;
}
.mp-related-card {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 1.1rem 1.2rem;
  border-radius: 16px;
  text-decoration: none;
  color: inherit;
  background: color-mix(in srgb, var(--bg-primary) 80%, transparent);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-light);
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1),
              box-shadow 0.3s ease, border-color 0.3s ease;
}
.mp-related-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 18px 40px -20px color-mix(in srgb, var(--primary-color) 55%, transparent);
  border-color: color-mix(in srgb, var(--primary-color) 45%, transparent);
}
.mp-related-kicker {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--primary-color);
}
.mp-related-name {
  font-size: 0.98rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-primary);
}
.mp-related-meta {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

/* =========================================================================
   7. RESPONSIVE
   ========================================================================= */
@media (max-width: 640px) {
  .mp-domain-header { gap: 0.75rem; }
  .mp-filters { justify-content: flex-start; }
  .detail-links { gap: 0.55rem; }
  .detail-link { flex: 1 1 auto; justify-content: center; }
  /* Metrics: two-up, don't blow out the row */
  .detail-metrics { padding: 1.1rem; gap: 0.9rem 1.1rem; }
  .detail-metric { flex: 1 1 42%; min-width: 0; }
  .detail-metric-num { font-size: clamp(1.5rem, 8vw, 2rem); }
  .detail-metric-label { overflow-wrap: break-word; }
  /* Media: shorter, tighter corners on small screens */
  .detail-cover { max-height: 300px; border-radius: 14px; }
  .detail-figure img { border-radius: 10px; }
  .detail-domain-tag { font-size: 0.7rem; padding: 0.28rem 0.65rem; }
  .detail-prose p, .detail-prose li { font-size: 0.96rem; line-height: 1.7; }
  .detail-section-title { font-size: clamp(1.2rem, 5.5vw, 1.5rem); }
}
@media (max-width: 380px) {
  .detail-title { font-size: 1.55rem; }
}

/* Detail-page cover image (shown when a project has an image; below the hero). */
.detail-cover {
  display: block;
  width: 100%;
  max-height: 420px;
  object-fit: cover;
  border-radius: 18px;
  margin: 0 0 clamp(1.5rem, 4vw, 2.25rem);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-medium, 0 8px 24px rgba(0,0,0,.12));
}

/* Detail-page figures (schematics, diagrams). */
.detail-figure { margin: 0 0 1.25rem; }
.detail-figure img {
  display: block;
  width: 100%;
  border-radius: 14px;
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  box-shadow: var(--shadow-light);
}
.detail-figure figcaption {
  margin-top: 0.6rem;
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--text-secondary);
}