/* ==========================================================================
   ARCHITECTURE DIAGRAM — Interactive System Visualization
   ========================================================================== */

/* ---------- Diagram container ---------- */
.arch-diagram {
  position: relative;
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

/* ---------- Tier bands ---------- */
.arch-tier {
  position: relative;
  border-radius: var(--border-radius-lg);
  padding: var(--space-5) var(--space-5) var(--space-6);
}

.arch-tier__header {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.arch-tier__title {
  font-size: var(--text-sm);
  font-weight: var(--font-bold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary-dark);
}

.arch-tier__subtitle {
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  color: var(--color-primary);
  font-style: italic;
}

/* Cloud tier */
.arch-tier--cloud {
  background-color: var(--color-secondary-subtle);
  border: 2px dashed var(--color-primary-light);
}

/* Edge tier */
.arch-tier--edge {
  background-color: var(--color-primary-subtle);
  border: 2px solid var(--color-primary);
}

/* Device tier */
.arch-tier--device {
  background-color: var(--color-secondary);
  border: 2px solid var(--color-primary-dark);
}

/* ---------- Component nodes ---------- */
.arch-nodes {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.arch-node {
  position: relative;
  background: var(--color-white);
  border: 1.5px solid var(--color-secondary-dark);
  border-radius: var(--border-radius-md);
  padding: var(--space-3) var(--space-4);
  min-width: 130px;
  transition: transform var(--transition-fast),
              box-shadow var(--transition-fast),
              border-color var(--transition-fast);
  cursor: default;
}

.arch-node:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(82, 164, 65, 0.18);
  border-color: var(--color-primary);
}

.arch-node__name {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-dark);
  margin-bottom: 2px;
}

.arch-node__tech {
  font-size: var(--text-xs);
  color: var(--color-gray-500);
  line-height: var(--leading-tight);
}

/* Node variant: database cylinder */
.arch-node--db {
  border-radius: var(--border-radius-md);
  border-top: 4px solid var(--color-primary);
}

/* Node variant: docker hexagon badge */
.arch-node--docker {
  background: var(--color-info-subtle);
  border-color: var(--color-info);
  padding: var(--space-2) var(--space-3);
  min-width: auto;
}

.arch-node--docker .arch-node__name {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  color: var(--color-gray-700);
}

/* ---------- CAN Bus Bar ---------- */
.arch-canbus {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) 0;
}

.arch-canbus__line {
  position: relative;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--color-primary-dark), var(--color-success), var(--color-primary-dark));
  box-shadow: 0 0 12px rgba(116, 254, 0, 0.5),
              0 0 24px rgba(116, 254, 0, 0.25);
  overflow: hidden;
}

/* Animated data-flow pulse */
.arch-canbus__line::after {
  content: '';
  position: absolute;
  top: 0;
  left: -40%;
  width: 40%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.7), transparent);
  animation: canPulse 2.5s ease-in-out infinite;
}

@keyframes canPulse {
  0%   { left: -40%; }
  100% { left: 140%; }
}

.arch-canbus__label {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--color-dark);
  color: var(--color-success);
  font-size: var(--text-xs);
  font-weight: var(--font-bold);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: var(--space-1) var(--space-4);
  border-radius: var(--border-radius-full);
  white-space: nowrap;
  z-index: 2;
  box-shadow: 0 0 16px rgba(116, 254, 0, 0.3);
}

.arch-canbus__specs {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-2);
}

.arch-canbus__spec {
  font-size: var(--text-xs);
  color: var(--color-primary-dark);
  font-weight: var(--font-medium);
}

/* ---------- Connection indicator between tiers ---------- */
.arch-connection {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) 0;
}

.arch-connection__arrow {
  width: 2px;
  height: 28px;
  position: relative;
  background: repeating-linear-gradient(
    to bottom,
    var(--color-primary-dark) 0px,
    var(--color-primary-dark) 4px,
    transparent 4px,
    transparent 8px
  );
}

.arch-connection__arrow::before,
.arch-connection__arrow::after {
  content: '';
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
}

.arch-connection__arrow::before {
  top: -1px;
  border-bottom: 6px solid var(--color-primary-dark);
}

.arch-connection__arrow::after {
  bottom: -1px;
  border-top: 6px solid var(--color-primary-dark);
}

.arch-connection__label {
  font-size: var(--text-xs);
  color: var(--color-primary-dark);
  font-style: italic;
  font-weight: var(--font-medium);
  text-align: center;
}

/* ---------- Device tier sub-groups ---------- */
.arch-device-groups {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

@media (min-width: 768px) {
  .arch-device-groups {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .arch-device-groups {
    grid-template-columns: repeat(4, 1fr);
  }
}

.arch-device-group {
  background: rgba(255,255,255,0.5);
  border: 1.5px solid var(--color-primary);
  border-radius: var(--border-radius-md);
  padding: var(--space-3);
}

.arch-device-group__title {
  font-size: var(--text-xs);
  font-weight: var(--font-bold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-primary-dark);
  margin-bottom: var(--space-3);
  text-align: center;
}

.arch-device-group__items {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.arch-device-item {
  background: var(--color-white);
  border: 1px solid var(--color-secondary-dark);
  border-radius: var(--border-radius-sm);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  color: var(--color-dark);
  text-align: center;
  transition: transform var(--transition-fast),
              box-shadow var(--transition-fast),
              border-color var(--transition-fast);
}

.arch-device-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(82, 164, 65, 0.15);
  border-color: var(--color-primary);
}

.arch-device-item span {
  display: block;
  font-size: 0.625rem;
  color: var(--color-gray-500);
  font-weight: var(--font-normal);
  margin-top: 1px;
}

/* ---------- Shared Libraries bar ---------- */
.arch-libs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
  padding: var(--space-3) var(--space-4);
  background: rgba(255,255,255,0.6);
  border: 1px solid var(--color-secondary-dark);
  border-radius: var(--border-radius-md);
}

.arch-libs__title {
  font-size: var(--text-xs);
  font-weight: var(--font-bold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-primary-dark);
  width: 100%;
  margin-bottom: var(--space-1);
}

.arch-libs__item {
  background: var(--color-white);
  border: 1px solid var(--color-secondary-dark);
  border-radius: var(--border-radius-sm);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  color: var(--color-gray-700);
}

/* ---------- Properties grid ---------- */
.arch-props {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

@media (min-width: 768px) {
  .arch-props {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .arch-props {
    grid-template-columns: repeat(3, 1fr);
  }
}

.arch-prop {
  background: var(--color-white);
  border-radius: var(--border-radius-md);
  padding: var(--space-5);
  border-left: 4px solid var(--color-primary);
  transition: transform var(--transition-fast),
              box-shadow var(--transition-fast);
}

.arch-prop:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.arch-prop__title {
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  color: var(--color-dark);
  margin-bottom: var(--space-2);
}

.arch-prop__text {
  font-size: var(--text-sm);
  color: var(--color-gray-700);
  line-height: var(--leading-relaxed);
}

/* ---------- Edge nodes grid ---------- */
.arch-edge-nodes {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}

@media (min-width: 768px) {
  .arch-edge-nodes {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 1024px) {
  .arch-edge-nodes {
    grid-template-columns: repeat(7, 1fr);
  }
}

/* ---------- Cloud nodes grid ---------- */
.arch-cloud-nodes {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}

@media (min-width: 768px) {
  .arch-cloud-nodes {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1024px) {
  .arch-cloud-nodes {
    grid-template-columns: repeat(5, 1fr);
  }
}

/* ---------- Firmware bar ---------- */
.arch-firmware-bar {
  margin-top: var(--space-3);
  padding: var(--space-2) var(--space-4);
  background: rgba(255,255,255,0.4);
  border-radius: var(--border-radius-sm);
  font-size: var(--text-xs);
  font-style: italic;
  color: var(--color-primary-dark);
  text-align: center;
}

/* ---------- Protocol tags ---------- */
.arch-protocols {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-6);
  justify-content: center;
}

.arch-protocol-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--border-radius-full);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  letter-spacing: 0.03em;
}

.arch-protocol-tag--can {
  background: var(--color-success-subtle);
  color: var(--color-primary-dark);
  border: 1px solid var(--color-success);
}

.arch-protocol-tag--mqtt {
  background: var(--color-primary-subtle);
  color: var(--color-primary-dark);
  border: 1px solid var(--color-primary);
}

.arch-protocol-tag--http {
  background: var(--color-info-subtle);
  color: #1a7a8a;
  border: 1px solid var(--color-info);
}

.arch-protocol-tag--ws {
  background: #fff3e0;
  color: #b86e00;
  border: 1px solid #ffb74d;
}

.arch-protocol-tag--espnow {
  background: var(--color-danger-subtle);
  color: #a83232;
  border: 1px solid var(--color-danger);
}

.arch-protocol-tag--ble {
  background: #e8eaf6;
  color: #3949ab;
  border: 1px solid #7986cb;
}

/* ---------- Diagram legend ---------- */
.arch-legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  justify-content: center;
  padding: var(--space-4);
  background: var(--color-gray-100);
  border-radius: var(--border-radius-md);
  margin-top: var(--space-6);
}

.arch-legend__item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-gray-700);
}

.arch-legend__swatch {
  width: 16px;
  height: 16px;
  border-radius: var(--border-radius-sm);
}

.arch-legend__swatch--cloud {
  background: var(--color-secondary-subtle);
  border: 1.5px dashed var(--color-primary-light);
}

.arch-legend__swatch--edge {
  background: var(--color-primary-subtle);
  border: 1.5px solid var(--color-primary);
}

.arch-legend__swatch--device {
  background: var(--color-secondary);
  border: 1.5px solid var(--color-primary-dark);
}

.arch-legend__swatch--canbus {
  width: 24px;
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--color-primary-dark), var(--color-success), var(--color-primary-dark));
  box-shadow: 0 0 6px rgba(116, 254, 0, 0.4);
}

/* ---------- Tier detail cards (below diagram) ---------- */
.arch-detail {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .arch-detail {
    grid-template-columns: 1fr 1fr;
  }
}

.arch-detail__card {
  background: var(--color-white);
  border-radius: var(--border-radius-lg);
  padding: var(--space-6);
  border-top: 4px solid var(--color-primary);
  transition: transform var(--transition-fast),
              box-shadow var(--transition-fast);
}

.arch-detail__card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.arch-detail__card h4 {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-2);
}

.arch-detail__card p {
  font-size: var(--text-sm);
  color: var(--color-gray-700);
  line-height: var(--leading-relaxed);
}

.arch-detail__card ul {
  list-style: none;
  padding: 0;
  margin-top: var(--space-3);
}

.arch-detail__card ul li {
  position: relative;
  padding-left: var(--space-5);
  font-size: var(--text-sm);
  color: var(--color-gray-700);
  margin-bottom: var(--space-2);
  line-height: var(--leading-normal);
}

.arch-detail__card ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 7px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
}

/* Variant borders */
.arch-detail__card--cloud {
  border-top-color: var(--color-primary-light);
}

.arch-detail__card--edge {
  border-top-color: var(--color-primary);
}

.arch-detail__card--device {
  border-top-color: var(--color-success);
}

.arch-detail__card--canbus {
  border-top-color: var(--color-success);
}

/* ---------- Repo link badges in diagram ---------- */
.arch-node__repo {
  display: inline-block;
  margin-top: var(--space-1);
  font-size: 0.625rem;
  color: var(--color-link);
  text-decoration: none;
  font-weight: var(--font-medium);
  transition: color var(--transition-fast);
}

.arch-node__repo:hover {
  color: var(--color-primary);
}

/* ---------- Subtle glow animation for CAN drops ---------- */
.arch-can-drop {
  display: flex;
  align-items: center;
  justify-content: center;
}

.arch-can-drop__line {
  width: 2px;
  height: 24px;
  background: var(--color-success);
  opacity: 0.6;
  position: relative;
}

.arch-can-drop__line::after {
  content: '';
  position: absolute;
  top: -3px;
  left: -3px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-success);
  box-shadow: 0 0 8px rgba(116, 254, 0, 0.5);
  animation: dropGlow 2s ease-in-out infinite;
}

@keyframes dropGlow {
  0%, 100% { opacity: 0.4; transform: scale(0.8); }
  50% { opacity: 1; transform: scale(1.2); }
}