/* ═══════════════════════════════════════════
   ARA Labs · Architecture Page Styles
   Loaded alongside home.css (for the shared .section/.diag-* primitives)
   on architecture.html only.
   ═══════════════════════════════════════════ */

/* ── PAGE INTRO ── */
.arch-hero {
  max-width: var(--max-w); margin: 0 auto;
  padding: calc(var(--nav-h) + 3.5rem) var(--page-px) 1rem;
}
.arch-hero h1 {
  font-size: clamp(2rem, 4vw, 2.8rem); font-weight: 700;
  letter-spacing: -0.025em; margin: 0.6rem 0 0.9rem; line-height: 1.1;
}
.arch-hero p {
  font-family: var(--font-mono); font-size: var(--text-sm); font-weight: 300;
  color: var(--text-secondary); line-height: 1.8; max-width: 620px;
}

/* ── DIAGRAM FRAME ── shared outer card so a multi-column diagram reads
   as one cohesive object rather than loose floating columns. */
.diagram-frame {
  border: 1px solid var(--accent-border2);
  background: rgba(13,32,32,0.4);
  border-radius: 4px;
  padding: 2.6rem 2.4rem;
}

/* ── PLATFORM ARCHITECTURE DIAGRAM ── */
.platform-grid {
  display: grid;
  grid-template-columns: 1fr auto 1.05fr auto 1.35fr;
  align-items: stretch;
  gap: 0 1.2rem;
}
.platform-arrow {
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); color: var(--accent-dim); font-size: 1.2rem;
}
/* Two arrows, one to each pathway box, rather than one shared arrow into
   the whole column -- makes clear both pathways connect to ARA
   independently rather than funneling through a single link. */
.platform-arrow-split {
  flex-direction: column; justify-content: space-around;
}
.platform-col { display: flex; flex-direction: column; gap: 1.6rem; }
.platform-group-label {
  font-family: var(--font-mono); font-size: var(--text-2xs); letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--text-secondary); margin-bottom: 0.65rem;
}
.platform-chips { display: flex; flex-direction: column; gap: 0.5rem; }
.platform-chips-wrap { flex-direction: row; flex-wrap: wrap; gap: 0.5rem; }
.platform-chip {
  display: flex; align-items: center; gap: 0.5rem;
  font-family: var(--font-mono); font-size: var(--text-xs); font-weight: 300;
  border: 1px solid var(--accent-border); padding: 0.5rem 0.8rem;
  color: var(--text-primary); border-radius: var(--r-sm);
}
.chip-icon {
  width: 14px; height: 14px; flex-shrink: 0; color: var(--accent);
}

.platform-core { justify-content: center; }
.platform-core-box {
  border: 1px solid var(--accent-border2); background: var(--accent-faint);
  padding: 1.8rem 1.6rem; display: flex; flex-direction: column; gap: 1rem;
}
.platform-core-title { font-size: 1.4rem; font-weight: 800; color: var(--accent); letter-spacing: -0.02em; }
.platform-core-sub {
  font-family: var(--font-mono); font-size: var(--text-xs); color: var(--text-secondary); margin-top: -0.7rem;
}
.platform-core-list { display: flex; flex-direction: column; gap: 0.65rem; }
.platform-core-list li {
  list-style: none; font-family: var(--font-mono); font-size: var(--text-xs); font-weight: 300;
  color: var(--text-primary); line-height: 1.55; padding-left: 1rem; position: relative;
}
.platform-core-list li::before { content: '•'; position: absolute; left: 0; color: var(--accent); }

.platform-pathways { justify-content: center; gap: 1.1rem; }
.platform-pathway {
  border: 1px solid var(--accent-border); border-radius: var(--r-sm); padding: 1.1rem 1.2rem;
}
.platform-pathway.critical { border-color: var(--accent-border2); background: rgba(64,200,168,0.04); }
.platform-pathway-head {
  display: flex; align-items: center; gap: 0.6rem; margin-bottom: 0.9rem; flex-wrap: wrap;
}
.platform-pathway-title {
  font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--accent);
}
.platform-pathway-tag {
  font-family: var(--font-mono); font-size: var(--text-2xs); letter-spacing: 0.06em;
  color: var(--text-secondary); border: 1px solid var(--accent-border); padding: 0.15rem 0.55rem;
  border-radius: 999px;
}
.platform-pathway .diag-mode-note { color: var(--text-primary); }
.platform-pathway .diag-box { color: var(--text-primary); }

.platform-strip {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 0.6rem;
  margin-top: 3rem;
}
.platform-strip-item {
  display: flex; align-items: center; gap: 0.5rem;
  font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.04em;
  color: var(--accent); border: 1px solid var(--accent-border2); background: var(--accent-faint);
  padding: 0.5rem 1.1rem; border-radius: 999px;
}

/* ── ENTITY-CENTRIC DECISION STATE DIAGRAM ── */
.entity-grid {
  display: grid; grid-template-columns: 1fr 0.85fr 1.25fr; gap: 2.2rem; align-items: center;
}
.entity-col { display: flex; flex-direction: column; gap: 1rem; }
.entity-arrow-down {
  text-align: center; color: var(--accent-dim); font-family: var(--font-mono); font-size: 1.1rem;
}
.entity-capture-box {
  border: 1px solid var(--accent-border2); background: var(--accent-faint); padding: 1.3rem 1.4rem;
}
.entity-capture-title {
  font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 0.9rem;
}

.entity-node-col { align-items: center; text-align: center; }
.entity-node {
  border: 1px solid var(--accent-border2); border-radius: 50%;
  width: 172px; height: 172px; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 0.7rem;
  background: var(--accent-faint); padding: 1.2rem;
  margin: 0 auto;
}
.entity-node-id {
  font-family: var(--font-mono); font-size: var(--text-sm); font-weight: 500; color: var(--accent);
}
.entity-node-caption {
  font-family: var(--font-mono); font-size: var(--text-2xs); color: var(--text-primary); line-height: 1.55;
}

.entity-timeline { display: flex; flex-direction: column; gap: 1rem; list-style: none; }
.entity-timeline li {
  display: flex; align-items: baseline; gap: 0.7rem; flex-wrap: wrap;
  font-family: var(--font-mono); font-size: var(--text-xs);
  border-left: 1px solid var(--accent-border); padding-left: 1rem; padding-bottom: 0.2rem;
  position: relative;
}
.entity-dot {
  position: absolute; left: -4.5px; top: 4px;
  width: 8px; height: 8px; border-radius: 50%; background: var(--accent);
}
.entity-dot.warn   { background: #ffb454; }
.entity-dot.danger { background: #ff6b6b; }
.entity-dot.ok     { background: var(--accent); }
.entity-date { color: var(--text-secondary); flex-shrink: 0; }
.entity-event { color: var(--text-primary); }

.entity-latency-note {
  font-family: var(--font-mono); font-size: var(--text-xs); color: var(--accent);
  margin-top: 1.2rem; padding-top: 1rem; border-top: 1px solid var(--accent-border);
}
.entity-query-list { display: flex; flex-direction: column; gap: 0.55rem; margin-top: 0.9rem; }
.entity-query-row {
  display: flex; align-items: center; justify-content: space-between;
  font-family: var(--font-mono); font-size: var(--text-xs); color: var(--text-primary);
}
.entity-query-pill {
  border: 1px solid var(--accent-border2); color: var(--accent);
  padding: 0.15rem 0.65rem; border-radius: 999px; font-size: var(--text-2xs);
}

/* ── ARCH PAGE CTA ── */
.arch-cta {
  max-width: var(--max-w); margin: 0 auto; padding: 1rem var(--page-px) 5rem;
  display: flex; gap: 0.9rem; flex-wrap: wrap; justify-content: center;
}

/* ── RESPONSIVE ── */
@media (max-width: 860px) {
  .platform-grid { grid-template-columns: 1fr; gap: 1rem 0; }
  /* Keep the flow readable when columns stack: arrows turn downward
     instead of disappearing, preserving the left-to-right narrative
     as top-to-bottom. */
  .platform-arrow { display: flex; justify-content: center; height: 30px; }
  .platform-arrow svg { transform: rotate(90deg); }
  .platform-arrow-split svg + svg { display: none; }
  .entity-grid { grid-template-columns: 1fr; }
  .entity-node-wrap svg { display: none; }
  .entity-node { margin: 0.5rem auto; }
}
@media (max-width: 600px) {
  /* Pathway mini-flows: three boxes side-by-side are unreadable at phone
     width - stack them with downward arrows, full-width boxes. */
  .diag-flow { flex-direction: column; align-items: stretch; gap: .35rem; }
  .diag-flow .diag-box { text-align: center; padding: .55rem .8rem; }
  .diag-flow .diag-arrow { transform: rotate(90deg); align-self: center; line-height: 1; }
}