/* ==========================================================================
   Architecture / Tech Overview — Animated flow diagram
   ========================================================================== */

.architecture {
  position: relative;
  background: linear-gradient(180deg, var(--bg-base) 0%, var(--bg-deep) 50%, var(--bg-base) 100%);
  overflow: hidden;
}

/* Subtle ambient glow */
.architecture::before {
  content: '';
  position: absolute;
  top: 30%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(46, 104, 233, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

/* ── Flow Diagram Container ── */
.arch-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  flex-wrap: nowrap;
  margin-bottom: var(--space-3xl);
  position: relative;
}

/* ── Flow Node ── */
.arch-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  flex-shrink: 0;
  position: relative;
}

.arch-node-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-lg) var(--space-xl);
  min-width: 140px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
  transition: all var(--duration-slow) var(--ease-out);
  position: relative;
  overflow: hidden;
}

/* Glow ring when node "activates" */
.arch-node-box::after {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: var(--radius-lg);
  border: 1px solid transparent;
  transition: border-color var(--duration-slow) var(--ease-out),
              box-shadow var(--duration-slow) var(--ease-out);
}

.arch-node.lit .arch-node-box {
  border-color: var(--border-glow);
  box-shadow: var(--glow-md);
}

.arch-node.lit .arch-node-box::after {
  border-color: var(--blue-500);
  box-shadow: inset 0 0 20px rgba(46, 104, 233, 0.1);
}

.arch-node-icon {
  width: 32px;
  height: 32px;
  color: var(--blue-400);
  transition: color var(--duration-slow) var(--ease-out);
}

.arch-node.lit .arch-node-icon {
  color: var(--blue-300);
}

.arch-node-icon svg {
  width: 100%;
  height: 100%;
}

.arch-node-label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-secondary);
  transition: color var(--duration-slow) var(--ease-out);
}

.arch-node.lit .arch-node-label {
  color: var(--text-primary);
}

.arch-node-sublabel {
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-top: 2px;
}

/* ── Arrow Connector ── */
.arch-arrow {
  display: flex;
  align-items: center;
  padding: 0 var(--space-sm);
  flex-shrink: 0;
}

.arch-arrow-line {
  width: 48px;
  height: 2px;
  background: var(--blue-900);
  position: relative;
  transition: background var(--duration-slow) var(--ease-out);
}

.arch-arrow-line::after {
  content: '';
  position: absolute;
  right: -6px;
  top: -4px;
  width: 0;
  height: 0;
  border-left: 8px solid var(--blue-900);
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  transition: border-left-color var(--duration-slow) var(--ease-out);
}

/* Animated pulse traveling along the arrow */
.arch-arrow-pulse {
  position: absolute;
  top: -2px;
  left: -4px;
  width: 8px;
  height: 6px;
  background: var(--blue-500);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--blue-500);
  opacity: 0;
  transition: opacity var(--duration-base) var(--ease-out);
}

.arch-arrow.lit .arch-arrow-line {
  background: var(--blue-600);
}

.arch-arrow.lit .arch-arrow-line::after {
  border-left-color: var(--blue-600);
}

.arch-arrow.lit .arch-arrow-pulse {
  opacity: 1;
  animation: arrow-travel 1s var(--ease-out) forwards;
}

@keyframes arrow-travel {
  0%   { left: -4px; opacity: 1; }
  80%  { opacity: 1; }
  100% { left: calc(100% - 4px); opacity: 0; }
}

/* ── Docker container expanded node ── */
.arch-node-box.container-box {
  min-width: 200px;
  padding: var(--space-lg);
}

.container-stack {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: var(--text-xs);
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.container-stack span {
  padding: 2px 8px;
  background: rgba(46, 104, 233, 0.08);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(46, 104, 233, 0.1);
}

/* ── Tech Stack Tags ── */
.tech-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
  margin-top: var(--space-xl);
}

.tech-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0.35rem 0.85rem;
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  backdrop-filter: blur(8px);
}

.tech-tag-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--blue-500);
}