/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

.model {
  margin: var(--odl-space-6) 0;
}

/* ===== Diagram =========================================================== */
.diagram {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--odl-space-4);
  padding: clamp(2rem, 1.5rem + 2vw, 3rem) clamp(1.25rem, 1rem + 1.5vw, 2rem);
  background: var(--odl-bg);
}
/* Blueprint grid fading out from the top, as on the landing hero. */
.gridLayer {
  position: absolute;
  inset: 0;
  pointer-events: none;
  -webkit-mask-image: radial-gradient(
    110% 100% at 50% 0%,
    #000 0%,
    transparent 78%
  );
  mask-image: radial-gradient(110% 100% at 50% 0%, #000 0%, transparent 78%);
}

.app,
.flow,
.ringOuter,
.backend {
  position: relative;
  transition: opacity var(--odl-dur) var(--odl-ease);
}

.app,
.service {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: var(--odl-space-3) var(--odl-space-4);
  border: 1px solid var(--odl-border-strong);
  border-radius: var(--odl-radius-md);
  background: var(--odl-surface);
  box-shadow: var(--odl-shadow-sm);
  transition: border-color var(--odl-dur) var(--odl-ease);
}

.comment {
  font-family: var(--odl-font-mono);
  font-size: var(--odl-text-2xs);
  color: var(--odl-fg-subtle);
  white-space: nowrap;
}
.code {
  font-family: var(--odl-font-mono);
  font-size: var(--odl-text-xs);
  color: var(--odl-fg);
  background: none;
  border: 0;
  padding: 0;
  white-space: nowrap;
}

/* Connectors: hairlines converging on the operator. The build arrow points
   right (config flows in), the call arrow points left (the app calls in). */
.flow {
  flex: 1 1 1.5rem;
  min-width: 1.25rem;
  height: 1px;
  background: var(--odl-border-strong);
}
.flow::after {
  content: "";
  position: absolute;
  width: 7px;
  height: 7px;
  border-top: 1px solid var(--odl-border-strong);
  border-right: 1px solid var(--odl-border-strong);
  transition: border-color var(--odl-dur) var(--odl-ease);
}
.flowBuild::after {
  right: 0;
  top: -3.5px;
  transform: rotate(45deg);
}
.flowCall::after {
  left: 0;
  top: -3.5px;
  transform: rotate(-135deg);
}
.flowLabel {
  position: absolute;
  left: 50%;
  bottom: 5px;
  transform: translateX(-50%);
  font-family: var(--odl-font-mono);
  font-size: var(--odl-text-2xs);
  letter-spacing: 0.04em;
  color: var(--odl-fg-subtle);
  transition: color var(--odl-dur) var(--odl-ease);
}

/* Layers wrap the operator as light, dashed envelopes; the operator stays
   the only solid mass in the middle. */
.ringOuter,
.ringInner {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: var(--odl-space-2) var(--odl-space-3) var(--odl-space-3);
  border: 1px dashed var(--odl-border-strong);
  transition: border-color var(--odl-dur) var(--odl-ease);
}
.ringOuter {
  border-radius: var(--odl-radius-lg);
  background: transparent;
}
.ringInner {
  border-radius: var(--odl-radius-md);
  background: var(--odl-surface);
  box-shadow: var(--odl-shadow-sm);
}
.ringLabel {
  font-family: var(--odl-font-mono);
  font-size: var(--odl-text-2xs);
  color: var(--odl-fg-muted);
  white-space: nowrap;
  transition: color var(--odl-dur) var(--odl-ease),
    opacity var(--odl-dur) var(--odl-ease);
}
/* "kind ·" prefix inside labels: quiet type, louder instance. */
.kind {
  font-weight: 400;
  color: var(--odl-fg-subtle);
  transition: color var(--odl-dur) var(--odl-ease);
}

/* The operator is the solid "bar" at the center of the model. */
.core {
  font-family: var(--odl-font-mono);
  font-size: var(--odl-text-sm);
  font-weight: 600;
  text-align: center;
  padding: var(--odl-space-3) var(--odl-space-6);
  border-radius: var(--odl-radius-sm);
  background: var(--odl-bar);
  color: var(--odl-bg);
  box-shadow: var(--odl-shadow-md);
  transition: opacity var(--odl-dur) var(--odl-ease),
    box-shadow var(--odl-dur) var(--odl-ease);
}

.backend {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--odl-space-2);
}
.svcName {
  font-family: var(--odl-font-mono);
  font-size: var(--odl-text-xs);
  font-weight: 600;
  color: var(--odl-fg-strong);
  transition: color var(--odl-dur) var(--odl-ease);
}
.alts {
  font-family: var(--odl-font-mono);
  font-size: var(--odl-text-2xs);
  color: var(--odl-fg-subtle);
  padding-left: 2px;
  white-space: nowrap;
  transition: color var(--odl-dur) var(--odl-ease);
}

/* ===== Highlight states ================================================== */
/* service */
.model[data-active="service"] .app,
.model[data-active="service"] .flow,
.model[data-active="service"] .ringOuter {
  opacity: 0.35;
}
.model[data-active="service"] .service {
  border-color: var(--odl-accent);
}
.model[data-active="service"] .svcName,
.model[data-active="service"] .svcName .kind {
  color: var(--odl-accent);
}
.model[data-active="service"] .alts {
  color: var(--odl-fg-muted);
}

/* operator */
.model[data-active="operator"] .app,
.model[data-active="operator"] .flow,
.model[data-active="operator"] .backend {
  opacity: 0.35;
}
.model[data-active="operator"] .ringOuter,
.model[data-active="operator"] .ringInner {
  border-color: var(--odl-border);
}
.model[data-active="operator"] .ringLabel {
  opacity: 0.4;
}
.model[data-active="operator"] .core {
  box-shadow: 0 0 0 2px var(--odl-accent), var(--odl-shadow-md);
}

/* layer */
.model[data-active="layer"] .app,
.model[data-active="layer"] .flow,
.model[data-active="layer"] .backend {
  opacity: 0.35;
}
.model[data-active="layer"] .ringOuter,
.model[data-active="layer"] .ringInner {
  border-color: var(--odl-accent);
}
.model[data-active="layer"] .ringLabel,
.model[data-active="layer"] .ringLabel .kind {
  color: var(--odl-accent);
}
.model[data-active="layer"] .core {
  opacity: 0.5;
}

/* operation */
.model[data-active="operation"] .app {
  border-color: var(--odl-accent);
}
.model[data-active="operation"] .flow {
  background: var(--odl-accent);
}
.model[data-active="operation"] .flow::after {
  border-color: var(--odl-accent);
}
.model[data-active="operation"] .flowLabel {
  color: var(--odl-accent);
}

/* ===== Legend — one compact row, tab-style accent indicator ============= */
.legend {
  display: flex;
  flex-wrap: wrap;
  margin: 0;
  border-top: 1px solid var(--odl-border);
  background: var(--odl-surface-2);
}
.legendItem {
  appearance: none;
  font: inherit;
  flex: 1 1 25%;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: var(--odl-space-2);
  padding: var(--odl-space-3) var(--odl-space-2);
  border: 0;
  border-top: 2px solid transparent;
  background: transparent;
  cursor: pointer;
  transition: background-color var(--odl-dur) var(--odl-ease),
    border-color var(--odl-dur) var(--odl-ease);
}
.legendItem:hover {
  background: var(--odl-surface);
}
.legendItemActive {
  background: var(--odl-surface);
  border-top-color: var(--odl-accent);
}
.legendIndex {
  font-family: var(--odl-font-mono);
  font-size: var(--odl-text-2xs);
  font-weight: 500;
  letter-spacing: var(--odl-tracking-label);
  color: var(--odl-fg-subtle);
  transition: color var(--odl-dur) var(--odl-ease);
}
.legendItemActive .legendIndex {
  color: var(--odl-accent);
}
.legendName {
  font-family: var(--odl-font-mono);
  font-size: var(--odl-text-sm);
  font-weight: 600;
  color: var(--odl-fg-muted);
  transition: color var(--odl-dur) var(--odl-ease);
}
.legendItemActive .legendName {
  color: var(--odl-fg-strong);
}

/* ===== Responsive ======================================================== */
@media (max-width: 768px) {
  .diagram {
    flex-direction: column;
    align-items: stretch;
  }
  .app,
  .ringOuter,
  .backend {
    align-self: center;
  }
  .flow {
    flex: 0 0 auto;
    align-self: center;
    width: 1px;
    min-width: 0;
    height: 1.5rem;
    min-height: 1.5rem;
  }
  /* Stacked: build points down into the operator, call points up from the
     app at the bottom. */
  .flowBuild::after {
    right: -3.5px;
    top: auto;
    bottom: 0;
    transform: rotate(135deg);
  }
  .flowCall::after {
    left: -3.5px;
    top: 0;
    transform: rotate(-45deg);
  }
  .flowLabel {
    left: 10px;
    bottom: auto;
    top: 50%;
    transform: translateY(-50%);
  }
  .legendItem {
    flex-basis: 50%;
  }
}