/* Platform Architecture — theme-aware enterprise polish */

/* ── Theme tokens (inherit global palette) ── */
.section-platform-arch {
  --arch-space-1: 8px;
  --arch-space-2: 16px;
  --arch-space-3: 24px;
  --arch-space-4: 32px;
  --arch-space-5: 40px;
  --arch-space-6: 48px;

  --arch-ops: var(--accent-blue);
  --arch-ops-soft: var(--accent-blue-muted);
  --arch-ops-glow: color-mix(in srgb, var(--accent-blue) 35%, transparent);
  --arch-ops-text: color-mix(in srgb, var(--accent-blue) 75%, var(--fg));

  --arch-commerce: var(--accent-amber);
  --arch-commerce-soft: var(--accent-amber-muted);
  --arch-commerce-glow: color-mix(in srgb, var(--accent-amber) 35%, transparent);
  --arch-commerce-text: color-mix(in srgb, var(--accent-amber) 80%, var(--fg));

  --arch-intel: var(--accent-green);
  --arch-intel-soft: var(--accent-green-muted);
  --arch-intel-glow: color-mix(in srgb, var(--accent-green) 35%, transparent);
  --arch-intel-text: color-mix(in srgb, var(--accent-green) 75%, var(--fg));

  --arch-accent: var(--brand-teal);
  --arch-accent-glow: color-mix(in srgb, var(--brand-teal) 45%, transparent);
  --arch-packet: var(--accent-cyan);

  --arch-fg: var(--fg);
  --arch-muted: var(--fg-muted);
  --arch-subtle: var(--fg-subtle);
  --arch-surface: var(--card-bg);
  --arch-glass: color-mix(in srgb, var(--card-bg) 78%, transparent);
  --arch-glass-strong: color-mix(in srgb, var(--card-bg) 92%, transparent);
  --arch-border: var(--border);
  --arch-border-soft: color-mix(in srgb, var(--fg) 10%, transparent);
  --arch-shadow: var(--shadow-md);
  --arch-shadow-lg: var(--shadow-lg);

  --arch-bg-base: var(--bg-muted);
  --arch-bg-elevated: color-mix(in srgb, var(--bg) 88%, var(--accent-blue) 12%);
  --arch-grid-line: var(--grid-line);
  --arch-popover-bg: var(--arch-glass-strong);
  --arch-hub-ring: color-mix(in srgb, var(--accent-blue) 30%, transparent);
  --arch-hub-ring-inner: color-mix(in srgb, var(--brand-teal) 22%, transparent);
  --arch-hub-glow-color: color-mix(in srgb, var(--accent-blue) 40%, transparent);
  --arch-hub-shadow: color-mix(in srgb, var(--accent-blue) 28%, transparent);
  --arch-hub-shadow-alt: color-mix(in srgb, var(--brand-teal) 22%, transparent);
  --arch-line-idle: color-mix(in srgb, var(--fg) 12%, transparent);
  --arch-node-bg: color-mix(in srgb, var(--card-bg) 70%, transparent);
  --arch-node-bg-hover: color-mix(in srgb, var(--card-bg) 85%, transparent);

  overflow: hidden;
  padding-bottom: 0;
}

[data-theme='dark'] .section-platform-arch {
  --arch-bg-elevated: color-mix(in srgb, var(--bg-secondary) 90%, var(--accent-blue) 10%);
  --arch-glass: color-mix(in srgb, var(--bg-elevated) 82%, transparent);
  --arch-glass-strong: color-mix(in srgb, var(--bg-elevated-card) 94%, transparent);
  --arch-popover-bg: var(--bg-popover);
  --arch-line-idle: color-mix(in srgb, var(--fg) 8%, transparent);
}

.section-platform-arch .section-header {
  margin-bottom: var(--arch-space-4);
  text-align: center;
  max-width: 52rem;
  margin-left: auto;
  margin-right: auto;
  padding-inline: var(--arch-space-2);
}

.section-platform-arch .section-title {
  font-size: clamp(2.75rem, 6.5vw, 4rem);
  letter-spacing: -0.035em;
  line-height: 1.06;
  color: var(--arch-fg);
}

.section-platform-arch .section-desc {
  max-width: 44rem;
  margin-top: var(--arch-space-2);
  font-size: clamp(1.0625rem, 2.2vw, 1.25rem);
  line-height: 1.75;
  color: var(--arch-muted);
}

.platform-arch {
  position: relative;
  color: var(--arch-fg);
  padding-bottom: var(--arch-space-5);
}

@media (min-width: 1024px) {
  .platform-arch {
    min-height: 90vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
}

/* ── Background ── */
.platform-arch-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  background:
    radial-gradient(ellipse 70% 50% at 50% 0%, var(--arch-ops-glow), transparent 55%),
    radial-gradient(ellipse 40% 30% at 18% 62%, var(--arch-intel-glow), transparent 50%),
    radial-gradient(ellipse 35% 25% at 82% 48%, var(--arch-commerce-glow), transparent 45%),
    linear-gradient(180deg, var(--arch-bg-base) 0%, var(--arch-bg-elevated) 52%, var(--arch-bg-base) 100%);
  transition: transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: transform;
}

.platform-arch-aurora {
  position: absolute;
  inset: -20%;
  background:
    radial-gradient(ellipse 50% 40% at 28% 38%, var(--arch-ops-glow), transparent 60%),
    radial-gradient(ellipse 42% 36% at 72% 58%, var(--arch-accent-glow), transparent 55%);
  animation: arch-aurora 28s ease-in-out infinite;
  opacity: 0.85;
}

.platform-arch-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--arch-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--arch-grid-line) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 82% 72% at 50% 34%, black 12%, transparent 76%);
  -webkit-mask-image: radial-gradient(ellipse 82% 72% at 50% 34%, black 12%, transparent 76%);
  animation: arch-grid-drift 80s linear infinite;
}

.platform-arch-particles {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, color-mix(in srgb, var(--arch-fg) 28%, transparent) 0.5px, transparent 0.5px);
  background-size: 112px 112px;
  opacity: 0.22;
  animation: arch-particles 70s linear infinite;
}

.platform-arch-depth {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 55% 45% at 50% 42%, transparent 30%, color-mix(in srgb, var(--arch-bg-base) 40%, transparent) 100%);
  pointer-events: none;
}

/* ── Canvas ── */
.platform-arch-canvas {
  position: relative;
  z-index: 1;
  flex: 1;
  width: 100%;
  max-width: min(1540px, 96vw);
  margin: 0 auto;
  padding: var(--arch-space-2) var(--arch-space-3);
  min-height: min(58vh, 680px);
  display: flex;
  align-items: center;
  justify-content: center;
}

.platform-arch-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: visible;
}

.arch-line {
  fill: none;
  stroke-width: 1.2;
  stroke-linecap: round;
  opacity: 0.14;
  transition: opacity 0.45s ease, stroke-width 0.45s ease;
}

.arch-line--hub-domain { stroke-width: 1.6; }
.arch-line--domain-node { stroke-width: 1; opacity: 0.1; }

.arch-line--operations { stroke: var(--arch-ops); }
.arch-line--commerce { stroke: var(--arch-commerce); }
.arch-line--intelligence { stroke: var(--arch-intel); }

.arch-line--active {
  opacity: 0.9;
  stroke-width: 2;
  filter: drop-shadow(0 0 8px var(--arch-accent-glow));
}

.arch-line--dimmed { opacity: 0.04; }

.arch-packet {
  opacity: 0;
  filter: drop-shadow(0 0 4px var(--arch-accent-glow));
}

.platform-arch.arch-step-6 .arch-packet,
.platform-arch.arch-step-7 .arch-packet {
  opacity: 0.92;
}

/* ── Tree ── */
.platform-arch-tree {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--arch-space-4);
  width: 100%;
}

/* ── Hub (+40% scale) ── */
.arch-hub {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--arch-space-1);
  opacity: 0;
  transform: scale(0.88);
  filter: blur(8px);
  transition: opacity 0.9s ease, transform 0.9s cubic-bezier(0.4, 0, 0.2, 1), filter 0.9s ease;
}

.platform-arch.arch-step-1 .arch-hub {
  opacity: 1;
  transform: scale(1);
  filter: blur(0);
}

.arch-hub-visual {
  position: relative;
  width: clamp(196px, 22.4vw, 280px);
  height: clamp(196px, 22.4vw, 280px);
  display: flex;
  align-items: center;
  justify-content: center;
}

.arch-hub-ring {
  position: absolute;
  inset: -18px;
  border-radius: 50%;
  border: 1px solid var(--arch-hub-ring);
  animation: arch-ring-spin 32s linear infinite;
}

.arch-hub-ring--inner {
  inset: -10px;
  border-color: var(--arch-hub-ring-inner);
  animation-direction: reverse;
  animation-duration: 24s;
}

.arch-hub-glass {
  position: relative;
  z-index: 2;
  width: 82%;
  height: 82%;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(145deg, color-mix(in srgb, var(--arch-surface) 90%, white 10%), color-mix(in srgb, var(--arch-surface) 70%, transparent));
  border: 1px solid var(--arch-border-soft);
  backdrop-filter: blur(28px);
  -webkit-backdrop-filter: blur(28px);
  box-shadow:
    0 0 80px var(--arch-hub-shadow),
    0 0 120px color-mix(in srgb, var(--arch-hub-shadow) 40%, transparent),
    inset 0 1px 0 color-mix(in srgb, var(--arch-fg) 12%, transparent);
  animation: arch-hub-breathe 5.5s ease-in-out infinite;
  transition: box-shadow 0.5s ease, transform 0.5s ease;
}

.arch-hub-glow {
  position: absolute;
  inset: 5%;
  border-radius: 50%;
  background: radial-gradient(circle, var(--arch-hub-glow-color) 0%, transparent 70%);
  animation: arch-hub-glow 5.5s ease-in-out infinite;
  pointer-events: none;
}

.arch-hub-logo {
  width: 62%;
  height: auto;
  object-fit: contain;
  filter: drop-shadow(0 0 16px var(--arch-hub-shadow));
}

.arch-hub-tagline {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--arch-muted);
}

.arch-hub--react .arch-hub-glass {
  transform: scale(1.05);
  box-shadow:
    0 0 100px var(--arch-hub-shadow-alt),
    0 0 140px var(--arch-hub-shadow),
    inset 0 1px 0 color-mix(in srgb, var(--arch-fg) 16%, transparent);
}

.arch-hub--react .arch-hub-ring { animation-duration: 14s; }

/* ── Domains ── */
.arch-domains {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--arch-space-3);
  width: 100%;
}

.arch-domain {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--arch-space-2);
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.platform-arch.arch-step-2 .arch-domain {
  opacity: 1;
  transform: translateY(0);
}

.arch-domain:nth-child(1) { transition-delay: 0.05s; }
.arch-domain:nth-child(2) { transition-delay: 0.12s; }
.arch-domain:nth-child(3) { transition-delay: 0.19s; }

.arch-domain-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--arch-space-1);
  padding: 10px var(--arch-space-2);
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  border: 1px solid var(--arch-border);
  background: var(--arch-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  color: var(--arch-fg);
  cursor: default;
  transition: border-color 0.4s ease, box-shadow 0.4s ease, background 0.4s ease, transform 0.4s ease;
}

.arch-domain--operations .arch-domain-pill {
  border-color: color-mix(in srgb, var(--arch-ops) 30%, var(--arch-border));
  color: var(--arch-ops-text);
  background: color-mix(in srgb, var(--arch-ops-soft) 60%, var(--arch-glass));
}

.arch-domain--commerce .arch-domain-pill {
  border-color: color-mix(in srgb, var(--arch-commerce) 30%, var(--arch-border));
  color: var(--arch-commerce-text);
  background: color-mix(in srgb, var(--arch-commerce-soft) 60%, var(--arch-glass));
}

.arch-domain--intelligence .arch-domain-pill {
  border-color: color-mix(in srgb, var(--arch-intel) 30%, var(--arch-border));
  color: var(--arch-intel-text);
  background: color-mix(in srgb, var(--arch-intel-soft) 60%, var(--arch-glass));
}

.arch-domain--highlight .arch-domain-pill {
  transform: scale(1.03);
  box-shadow: 0 0 28px var(--arch-ops-glow);
}

.arch-domain--commerce.arch-domain--highlight .arch-domain-pill {
  box-shadow: 0 0 28px var(--arch-commerce-glow);
}

.arch-domain--intelligence.arch-domain--highlight .arch-domain-pill {
  box-shadow: 0 0 28px var(--arch-intel-glow);
}

.arch-domain--branch .arch-domain-pill {
  border-color: color-mix(in srgb, var(--arch-accent) 35%, var(--arch-border));
}

.arch-domain-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 10px currentColor;
}

/* ── Nodes (+20% scale) ── */
.arch-nodes {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
  width: 100%;
}

.arch-node {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px 7px 8px;
  border-radius: var(--radius-full);
  border: 1px solid var(--arch-border);
  background: var(--arch-node-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--arch-shadow);
  cursor: default;
  outline: none;
  opacity: 0;
  transform: translateY(14px) scale(0.96);
  transition:
    opacity 0.5s ease,
    transform 0.5s ease,
    border-color 0.35s ease,
    box-shadow 0.35s ease,
    background 0.35s ease;
  will-change: transform, opacity;
}

.platform-arch.arch-step-3 .arch-domain--operations .arch-node,
.platform-arch.arch-step-4 .arch-domain--commerce .arch-node,
.platform-arch.arch-step-5 .arch-domain--intelligence .arch-node {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.arch-domain--operations .arch-node:nth-child(1) { transition-delay: 0.04s; }
.arch-domain--operations .arch-node:nth-child(2) { transition-delay: 0.08s; }
.arch-domain--operations .arch-node:nth-child(3) { transition-delay: 0.12s; }
.arch-domain--operations .arch-node:nth-child(4) { transition-delay: 0.16s; }
.arch-domain--operations .arch-node:nth-child(5) { transition-delay: 0.2s; }
.arch-domain--operations .arch-node:nth-child(6) { transition-delay: 0.24s; }
.arch-domain--operations .arch-node:nth-child(7) { transition-delay: 0.28s; }
.arch-domain--operations .arch-node:nth-child(8) { transition-delay: 0.32s; }

.arch-domain--commerce .arch-node:nth-child(1) { transition-delay: 0.04s; }
.arch-domain--commerce .arch-node:nth-child(2) { transition-delay: 0.08s; }
.arch-domain--commerce .arch-node:nth-child(3) { transition-delay: 0.12s; }
.arch-domain--commerce .arch-node:nth-child(4) { transition-delay: 0.16s; }
.arch-domain--commerce .arch-node:nth-child(5) { transition-delay: 0.2s; }
.arch-domain--commerce .arch-node:nth-child(6) { transition-delay: 0.24s; }
.arch-domain--commerce .arch-node:nth-child(7) { transition-delay: 0.28s; }

.arch-domain--intelligence .arch-node:nth-child(1) { transition-delay: 0.04s; }
.arch-domain--intelligence .arch-node:nth-child(2) { transition-delay: 0.08s; }
.arch-domain--intelligence .arch-node:nth-child(3) { transition-delay: 0.12s; }
.arch-domain--intelligence .arch-node:nth-child(4) { transition-delay: 0.16s; }
.arch-domain--intelligence .arch-node:nth-child(5) { transition-delay: 0.2s; }
.arch-domain--intelligence .arch-node:nth-child(6) { transition-delay: 0.24s; }
.arch-domain--intelligence .arch-node:nth-child(7) { transition-delay: 0.28s; }
.arch-domain--intelligence .arch-node:nth-child(8) { transition-delay: 0.32s; }
.arch-domain--intelligence .arch-node:nth-child(9) { transition-delay: 0.36s; }

.arch-node-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  flex-shrink: 0;
  background: color-mix(in srgb, var(--arch-fg) 6%, transparent);
  color: var(--arch-muted);
  transition: color 0.35s ease, background 0.35s ease, transform 0.35s ease;
}

.arch-domain--operations .arch-node-icon { color: var(--arch-ops-text); background: var(--arch-ops-soft); }
.arch-domain--commerce .arch-node-icon { color: var(--arch-commerce-text); background: var(--arch-commerce-soft); }
.arch-domain--intelligence .arch-node-icon { color: var(--arch-intel-text); background: var(--arch-intel-soft); }

.arch-node-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.2;
  min-width: 0;
}

.arch-node-title {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  white-space: nowrap;
  color: var(--arch-fg);
}

.arch-node-sub {
  font-size: 0.6875rem;
  color: var(--arch-muted);
  white-space: nowrap;
}

.arch-node:hover,
.arch-node:focus-visible,
.arch-node--active {
  border-color: color-mix(in srgb, var(--arch-accent) 35%, var(--arch-border));
  background: var(--arch-node-bg-hover);
  box-shadow: var(--arch-shadow-lg);
  transform: translateY(-2px) scale(1.02);
  z-index: 5;
}

.arch-node--branch {
  border-color: color-mix(in srgb, var(--arch-accent) 25%, var(--arch-border));
  background: var(--arch-node-bg-hover);
}

.arch-node--dimmed {
  opacity: 0.18 !important;
  transform: scale(0.98);
  filter: blur(0.5px);
}

.arch-domain--dimmed {
  opacity: 0.22 !important;
}

.arch-domain--dimmed .arch-domain-pill { opacity: 0.45; }

/* ── Popover ── */
.arch-popover {
  position: fixed;
  z-index: 1000;
  min-width: 176px;
  max-width: 240px;
  padding: var(--arch-space-2);
  border-radius: var(--radius-md);
  background: var(--arch-popover-bg);
  border: 1px solid var(--arch-border-soft);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--arch-shadow-lg);
  pointer-events: none;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.25s ease, transform 0.25s ease;
  color: var(--arch-fg);
}

.arch-popover--visible {
  opacity: 1;
  transform: translateY(0);
}

.arch-popover-title {
  font-size: 0.875rem;
  font-weight: 700;
  margin-bottom: var(--arch-space-1);
  padding-bottom: 6px;
  border-bottom: 1px solid var(--arch-border);
}

.arch-popover-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.arch-popover-list li {
  font-size: 0.75rem;
  color: var(--arch-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.arch-popover-check {
  color: var(--arch-intel);
  font-size: 0.6875rem;
}

/* ── Enterprise data flow timeline ── */
.platform-arch-flow-wrap {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: min(1320px, 96vw);
  margin: var(--arch-space-4) auto 0;
  padding: 0 var(--arch-space-3);
}

.platform-arch-flow-label {
  text-align: center;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--arch-muted);
  margin-bottom: var(--arch-space-2);
}

.platform-arch-flow-track {
  position: relative;
  padding: var(--arch-space-2) 0 var(--arch-space-3);
}

.arch-flow-rail {
  position: absolute;
  top: 26px;
  left: var(--arch-space-2);
  right: var(--arch-space-2);
  height: 2px;
  border-radius: 1px;
  background: linear-gradient(90deg,
    transparent,
    var(--arch-line-idle) 8%,
    color-mix(in srgb, var(--arch-accent) 40%, transparent) 50%,
    var(--arch-line-idle) 92%,
    transparent);
  overflow: hidden;
}

.arch-flow-rail-glow {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, var(--arch-accent-glow), transparent);
  animation: arch-rail-pulse 3s ease-in-out infinite;
}

.arch-flow-rail-packet {
  position: absolute;
  top: 50%;
  left: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--arch-packet);
  box-shadow: 0 0 12px var(--arch-accent-glow);
  transform: translate(-50%, -50%);
  animation: arch-rail-packet 5s ease-in-out infinite;
}

.platform-arch-flow {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 0;
  overflow-x: auto;
  scrollbar-width: none;
  z-index: 1;
}

.platform-arch-flow::-webkit-scrollbar { display: none; }

.arch-flow-step {
  position: relative;
  flex: 1 0 min(112px, 24vw);
  min-width: 88px;
  text-align: center;
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s ease, transform 0.6s ease;
  padding-top: 2px;
}

.platform-arch.arch-step-7 .arch-flow-step {
  opacity: 1;
  transform: translateY(0);
}

.arch-flow-step:nth-child(1) { transition-delay: 0.05s; }
.arch-flow-step:nth-child(2) { transition-delay: 0.1s; }
.arch-flow-step:nth-child(3) { transition-delay: 0.15s; }
.arch-flow-step:nth-child(4) { transition-delay: 0.2s; }
.arch-flow-step:nth-child(5) { transition-delay: 0.25s; }
.arch-flow-step:nth-child(6) { transition-delay: 0.3s; }
.arch-flow-step:nth-child(7) { transition-delay: 0.35s; }
.arch-flow-step:nth-child(8) { transition-delay: 0.4s; }
.arch-flow-step:nth-child(9) { transition-delay: 0.45s; }

.arch-flow-node {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  margin: 0 auto var(--arch-space-1);
  background: var(--arch-accent);
  border: 2px solid color-mix(in srgb, var(--arch-accent) 40%, var(--arch-surface));
  box-shadow: 0 0 14px var(--arch-accent-glow);
  transition: transform 0.35s ease, box-shadow 0.35s ease;
}

.arch-flow-step:hover .arch-flow-node {
  transform: scale(1.15);
  box-shadow: 0 0 20px var(--arch-accent-glow);
}

.arch-flow-title {
  font-size: 0.6875rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--arch-fg);
  padding: 0 4px;
}

.arch-flow-packet {
  position: absolute;
  top: 20px;
  left: 0;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--arch-packet);
  box-shadow: 0 0 10px var(--arch-accent-glow);
  animation: arch-flow-packet 3.5s ease-in-out infinite;
  pointer-events: none;
}

.arch-flow-step:nth-child(2) .arch-flow-packet { animation-delay: -0.4s; }
.arch-flow-step:nth-child(3) .arch-flow-packet { animation-delay: -0.9s; }
.arch-flow-step:nth-child(4) .arch-flow-packet { animation-delay: -1.4s; }
.arch-flow-step:nth-child(5) .arch-flow-packet { animation-delay: -1.9s; }
.arch-flow-step:nth-child(6) .arch-flow-packet { animation-delay: -2.4s; }
.arch-flow-step:nth-child(7) .arch-flow-packet { animation-delay: -2.9s; }
.arch-flow-step:nth-child(8) .arch-flow-packet { animation-delay: -3.4s; }
.arch-flow-step:nth-child(9) .arch-flow-packet { animation-delay: -3.9s; }

/* ── Premium metric cards ── */
.platform-arch-stats {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: var(--arch-space-2);
  width: 100%;
  max-width: min(1320px, 96vw);
  margin: var(--arch-space-4) auto 0;
  padding: 0 var(--arch-space-3) var(--arch-space-2);
}

.arch-metric {
  padding: var(--arch-space-2);
  border-radius: var(--radius-md);
  background: var(--arch-glass);
  border: 1px solid var(--arch-border);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  box-shadow: var(--arch-shadow);
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease, border-color 0.4s ease, box-shadow 0.4s ease;
}

.platform-arch.arch-step-7 .arch-metric {
  opacity: 1;
  transform: translateY(0);
}

.arch-metric:nth-child(1) { transition-delay: 0.08s; }
.arch-metric:nth-child(2) { transition-delay: 0.13s; }
.arch-metric:nth-child(3) { transition-delay: 0.18s; }
.arch-metric:nth-child(4) { transition-delay: 0.23s; }
.arch-metric:nth-child(5) { transition-delay: 0.28s; }
.arch-metric:nth-child(6) { transition-delay: 0.33s; }

.arch-metric:hover {
  border-color: color-mix(in srgb, var(--arch-accent) 25%, var(--arch-border));
  box-shadow: var(--arch-shadow-lg);
}

.arch-metric-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--arch-space-1);
  margin-bottom: var(--arch-space-1);
}

.arch-metric-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--arch-accent) 12%, var(--arch-glass));
  color: var(--arch-accent);
  flex-shrink: 0;
}

.arch-metric-sparkline {
  flex: 1;
  height: 28px;
  min-width: 0;
  opacity: 0.85;
}

.arch-metric-sparkline svg {
  width: 100%;
  height: 100%;
  display: block;
}

.arch-metric-sparkline path {
  fill: none;
  stroke: var(--arch-accent);
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 120;
  stroke-dashoffset: 120;
}

.platform-arch.arch-step-7 .arch-metric-sparkline path {
  animation: arch-spark-draw 1.4s ease forwards;
}

.arch-metric-value {
  font-size: clamp(1.25rem, 2.8vw, 1.625rem);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--arch-fg);
  margin-bottom: 4px;
  line-height: 1.2;
}

.arch-metric-label {
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--arch-muted);
  line-height: 1.35;
  letter-spacing: 0.01em;
}

/* Mobile accordion */
.arch-domain-toggle {
  display: none;
}

/* ── Keyframes (GPU-friendly) ── */
@keyframes arch-aurora {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  50% { transform: translate(1.5%, -1%) rotate(0.8deg); }
}

@keyframes arch-grid-drift {
  to { background-position: 56px 56px; }
}

@keyframes arch-particles {
  to { background-position: 112px 112px; }
}

@keyframes arch-ring-spin {
  to { transform: rotate(360deg); }
}

@keyframes arch-hub-breathe {
  0%, 100% { box-shadow: 0 0 80px var(--arch-hub-shadow), inset 0 1px 0 color-mix(in srgb, var(--arch-fg) 12%, transparent); }
  50% { box-shadow: 0 0 100px var(--arch-hub-shadow-alt), inset 0 1px 0 color-mix(in srgb, var(--arch-fg) 16%, transparent); }
}

@keyframes arch-hub-glow {
  0%, 100% { opacity: 0.5; transform: scale(1); }
  50% { opacity: 0.8; transform: scale(1.08); }
}

@keyframes arch-line-flow {
  to { stroke-dashoffset: -26; }
}

@keyframes arch-flow-packet {
  0% { left: 0; opacity: 0; }
  8% { opacity: 1; }
  92% { opacity: 1; }
  100% { left: calc(100% + 10px); opacity: 0; }
}

@keyframes arch-rail-packet {
  0% { left: 0; opacity: 0; }
  5% { opacity: 1; }
  95% { opacity: 1; }
  100% { left: 100%; opacity: 0; }
}

@keyframes arch-rail-pulse {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.7; }
}

@keyframes arch-spark-draw {
  to { stroke-dashoffset: 0; }
}

/* ── Responsive ── */
@media (max-width: 1023px) {
  .platform-arch {
    min-height: auto;
  }

  .platform-arch-canvas {
    min-height: auto;
    padding: var(--arch-space-2);
  }

  .arch-domains {
    grid-template-columns: 1fr;
    gap: var(--arch-space-1);
    max-width: 520px;
    margin: 0 auto;
  }

  .arch-domain-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 14px var(--arch-space-2);
    border-radius: var(--radius-md);
    border: 1px solid var(--arch-border);
    background: var(--arch-glass);
    color: var(--arch-fg);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: border-color 0.3s ease, background 0.3s ease;
  }

  .arch-domain-toggle-icon {
    width: 20px;
    height: 20px;
    transition: transform 0.35s ease;
  }

  .arch-domain--open .arch-domain-toggle-icon {
    transform: rotate(180deg);
  }

  .arch-domain-pill { display: none; }

  .arch-nodes {
    display: none;
    padding: var(--arch-space-1) 0 4px;
    gap: 6px;
  }

  .arch-domain--open .arch-nodes { display: flex; }

  .arch-node {
    opacity: 1;
    transform: none;
  }

  .platform-arch-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .arch-flow-rail { display: none; }

  .platform-arch-flow { gap: var(--arch-space-1); }

  .arch-flow-step {
    flex: 0 0 min(100px, 30vw);
  }
}

@media (max-width: 639px) {
  .platform-arch-stats {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 1024px) {
  .arch-domain-toggle { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .arch-hub-ring,
  .arch-hub-glass,
  .arch-hub-glow,
  .platform-arch-aurora,
  .platform-arch-grid,
  .platform-arch-particles,
  .arch-flow-packet,
  .arch-flow-rail-packet,
  .arch-flow-rail-glow,
  .arch-metric-sparkline path {
    animation: none !important;
  }

  .arch-metric-sparkline path {
    stroke-dashoffset: 0;
  }
}