/* ─── PLATFORM ARCHITECTURE ─── */
.architecture {
  padding: 120px 48px;
  background: var(--bg-deep);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.arch-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  margin-top: 64px;
}

.arch-diagram {
  position: relative;
}

.arch-stack {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.arch-layer {
  display: flex; align-items: center;
  padding: 14px 20px;
  border: 1px solid var(--border);
  background: var(--bg-void);
  position: relative;
  transition: border-color 0.2s, background 0.2s;
  cursor: default;
}

.arch-layer:hover {
  border-color: var(--border-hi);
  background: var(--bg-surface);
}

.arch-layer-label {
  font-family: 'Chakra Petch', monospace;
  font-size: 13px; font-weight: 600;
  color: var(--text-hi);
  letter-spacing: 0.05em;
  flex: 1;
}

.arch-layer-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  color: var(--text-lo);
  letter-spacing: 0.1em;
}

.arch-layer-bar {
  position: absolute; left: 0; top: 0; bottom: 0;
  width: 3px;
}

.layer-ui    { --lc: var(--cyan); }
.layer-api   { --lc: #4CF5BE; }
.layer-orch  { --lc: #00B4CC; }
.layer-cont  { --lc: var(--amber); }
.layer-sec   { --lc: #FF6B6B; }
.layer-kern  { --lc: var(--green); }

.arch-layer-bar { background: var(--lc); }
.arch-layer:hover .arch-layer-label { color: var(--lc); }

.arch-features {
  display: flex; flex-direction: column; gap: 28px;
}

.arch-feat {
  display: flex; gap: 20px;
  align-items: flex-start;
}

.arch-feat-icon {
  width: 40px; height: 40px;
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  color: var(--cyan);
  background: var(--bg-surface);
  font-size: 18px;
}

.arch-feat-title {
  font-family: 'Chakra Petch', monospace;
  font-size: 15px; font-weight: 600;
  color: var(--text-hi);
  margin-bottom: 6px;
}

.arch-feat-desc {
  font-size: 14px; font-weight: 300;
  color: var(--text-mid);
  line-height: 1.75;
}