/* ==========================================================================
   Agents page (spec: specs/8-agents-page.md)
   Loaded after styles.css, which provides the design tokens, base styles,
   header/nav, and footer. Tokens only, no hex values. The dark surface and
   the three motion effects are sanctioned by DESIGN_SYSTEM.md,
   "Dark showcase surface".
   ========================================================================== */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- Page surface ---------- */

.agents-main {
  background-color: var(--color-code-bg);
  color: var(--color-code-text);
  padding-block: var(--space-12);
}

@media (min-width: 768px) {
  .agents-main {
    padding-block: var(--space-16);
  }
}

.agents-main a {
  color: var(--color-syntax-function);
}

.agents-main a:hover {
  color: var(--color-syntax-keyword);
}

/* Grid: header, then the BUILD:crew elements (status, lanes, support), then
   the console. One column on mobile; console beside the lanes from lg up. */
.agents {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  row-gap: var(--space-6);
}

@media (min-width: 1024px) {
  .agents {
    grid-template-columns: minmax(0, 5fr) minmax(0, 2fr);
    column-gap: var(--space-8);
  }

  .agents > * {
    grid-column: 1;
  }

  .agents > .agents__header {
    grid-column: 1 / -1;
  }

  .agents > .console {
    grid-column: 2;
    grid-row: 2 / span 4;
    align-self: start;
    position: sticky;
    top: var(--space-24);
  }
}

/* ---------- Header ---------- */

.agents__back {
  font-size: var(--text-sm);
  font-weight: 700;
  margin-bottom: var(--space-4);
}

.agents__back a {
  text-decoration: none;
}

.agents__back a:hover {
  text-decoration: underline;
}

.agents__title {
  font-size: var(--text-2xl);
  color: var(--color-code-text);
  margin-bottom: var(--space-4);
}

@media (min-width: 768px) {
  .agents__title {
    font-size: var(--text-3xl);
  }
}

.agents__intro {
  max-width: 70ch;
  font-size: var(--text-lg);
}

.agents__controls {
  margin-top: var(--space-6);
}

.replay-button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-syntax-function);
  background-color: transparent;
  border: 1px solid var(--color-syntax-function);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: color 150ms ease, background-color 150ms ease, border-color 150ms ease;
}

.replay-button::before {
  content: "\25B6";
  content: "\25B6" / "";
}

.replay-button[data-state="running"]::before {
  content: "\25A0";
  content: "\25A0" / "";
}

.replay-button:hover {
  color: var(--color-code-text);
  background-color: var(--color-code-border);
}

.replay-button[hidden],
.console__js-hint[hidden] {
  display: none;
}

/* ---------- Status line ---------- */

.crew-status {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-code-text);
}

.crew-status__dot {
  flex-shrink: 0;
  width: var(--space-2);
  height: var(--space-2);
  border-radius: 50%;
  background-color: var(--color-syntax-type);
  animation: crew-pulse 2s ease-in-out infinite;
}

@keyframes crew-pulse {
  50% {
    opacity: 0.35;
  }
}

/* ---------- Lanes ---------- */

.lane,
.crew-support {
  border: 1px solid var(--color-code-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}

.lane__title {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-syntax-comment);
  text-transform: uppercase;
  margin-bottom: var(--space-4);
}

/* Mobile: steps stack vertically, vertical connectors between them. */
.lane__steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  margin: 0;
  padding: 0;
  list-style: none;
}

.lane__step {
  position: relative;
}

.lane__step--branch {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2);
}

.lane__step + .lane__step::before {
  content: "";
  position: absolute;
  bottom: 100%;
  left: 50%;
  width: 2px;
  height: var(--space-6);
  transform: translateX(-50%);
  background-color: var(--color-code-border);
  transition: background-color 200ms ease;
}

.lane__step.is-lit::before {
  background-color: var(--color-syntax-function);
}

/* md+: steps run left to right, horizontal connectors. */
@media (min-width: 768px) {
  .lane__steps {
    flex-direction: row;
    gap: var(--space-4);
  }

  .lane__step {
    flex: 1 1 0;
    min-width: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: var(--space-2);
  }

  .lane__step--branch {
    display: flex;
  }

  .lane__step + .lane__step::before {
    bottom: auto;
    left: auto;
    top: 50%;
    right: 100%;
    width: var(--space-4);
    height: 2px;
    transform: translateY(-50%);
  }
}

/* ---------- Support row ---------- */

.crew-support__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.crew-support__item {
  flex: 1 1 auto;
}

@media (min-width: 640px) {
  .crew-support__item {
    flex: 0 1 auto;
  }
}

/* ---------- Nodes ---------- */

.node {
  position: relative;
  scroll-margin-top: var(--space-24); /* keep focused nodes clear of the sticky header */
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "glyph name"
    "glyph kind";
  align-items: center;
  column-gap: var(--space-3);
  width: 100%;
  padding: var(--space-2) var(--space-3);
  font: inherit;
  text-align: left;
  color: var(--color-code-text);
  background-color: transparent;
  border: 1px solid var(--color-code-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color 200ms ease, border-color 200ms ease, color 200ms ease;
}

.node__glyph {
  grid-area: glyph;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: var(--space-8);
  height: var(--space-8);
  padding-inline: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  border-radius: var(--radius-sm);
}

.node__name {
  grid-area: name;
  font-size: var(--text-sm);
  font-weight: 700;
  line-height: 1.2;
  overflow-wrap: break-word;
}

.node__kind {
  grid-area: kind;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

/* Agents: solid cards. */
.node--agent {
  background-color: var(--color-primary);
  border-color: var(--color-accent);
}

.node--agent .node__glyph {
  background-color: var(--color-syntax-keyword);
  color: var(--color-code-bg);
}

.node--agent .node__kind {
  color: var(--color-syntax-keyword);
}

/* Skills: outlined chips. */
.node--skill {
  border-color: var(--color-syntax-type);
  border-radius: var(--radius-sm);
}

.node--skill .node__glyph {
  border: 1px solid var(--color-syntax-type);
  color: var(--color-syntax-type);
}

.node--skill .node__kind {
  color: var(--color-syntax-type);
}

/* The human: warm amber accent. */
.node--human {
  border-color: var(--color-accent-warm);
}

.node--human .node__glyph {
  background-color: var(--color-accent-warm);
  color: var(--color-primary);
}

.node--human .node__kind {
  color: var(--color-accent-warm);
}

/* Stacked glyph / name / kind: branch nodes always (they sit side by side on
   mobile), every lane node from md up. */
.lane__step--branch .node {
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas:
    "glyph"
    "name"
    "kind";
  justify-items: center;
  row-gap: var(--space-1);
  padding: var(--space-3) var(--space-2);
  text-align: center;
}

@media (min-width: 768px) {
  .lane__steps .node {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "glyph"
      "name"
      "kind";
    justify-items: center;
    row-gap: var(--space-1);
    padding: var(--space-3) var(--space-2);
    text-align: center;
  }
}

/* Selected: a bar along the bottom edge and an underlined name, not color alone. */
.node[aria-pressed="true"] .node__name {
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: var(--space-1);
}

.node[aria-pressed="true"]::after {
  content: "";
  position: absolute;
  left: var(--space-2);
  right: var(--space-2);
  bottom: 0;
  height: var(--space-1);
  background-color: currentColor;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}

/* Replay highlight. */
.node.is-lit {
  background-color: var(--color-code-border);
  border-color: var(--color-syntax-function);
}

.node--human.is-lit {
  border-color: var(--color-accent-warm);
}

/* ---------- Console ---------- */

.console {
  border: 1px solid var(--color-code-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.console__bar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-4);
  background-color: var(--color-code-border);
}

.console__lights {
  display: inline-flex;
  gap: var(--space-1);
}

.console__lights span {
  width: var(--space-2);
  height: var(--space-2);
  border-radius: 50%;
  background-color: var(--color-syntax-comment);
}

.console__title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-code-text);
}

.console__body {
  min-height: calc(var(--space-24) * 3);
  padding: var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  overflow-wrap: anywhere;
}

.console__body p + p,
.console__intro > * + * {
  margin-top: var(--space-3);
}

.console__prompt {
  color: var(--color-syntax-function);
}

.console__who {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
}

.console__glyph {
  padding-inline: var(--space-1);
  font-weight: 700;
  color: var(--color-code-bg);
  background-color: var(--color-syntax-keyword);
  border-radius: var(--radius-sm);
}

.console__who--human .console__glyph {
  color: var(--color-primary);
  background-color: var(--color-accent-warm);
}

.console__who--skill .console__glyph {
  background-color: var(--color-syntax-type);
}

.console__name {
  font-weight: 700;
}

.console__kind {
  color: var(--color-syntax-comment);
}

.console__line {
  color: var(--color-code-text);
}

.console__line::before {
  content: "> ";
  content: "> " / "";
  color: var(--color-syntax-function);
}

.console__caret {
  display: inline-block;
  width: var(--space-2);
  height: var(--text-sm);
  margin-left: var(--space-1);
  vertical-align: text-bottom;
  background-color: var(--color-code-text);
  animation: crew-caret 1s steps(1) infinite;
}

@keyframes crew-caret {
  50% {
    opacity: 0;
  }
}

.console__meta {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-2) var(--space-4);
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-code-border);
}

.console__meta dt {
  color: var(--color-syntax-comment);
}

.console__owns li::before {
  content: "- ";
  content: "- " / "";
  color: var(--color-syntax-comment);
}

.console__log {
  margin: var(--space-3) 0 0;
  padding: 0;
  list-style: none;
}

.console__log li + li {
  margin-top: var(--space-2);
}

.console__log-who {
  font-weight: 700;
  color: var(--color-syntax-keyword);
}

.console__log-who--human {
  color: var(--color-accent-warm);
}

.console__log-who--skill {
  color: var(--color-syntax-type);
}

.console__log-end {
  color: var(--color-syntax-comment);
}

/* ---------- Reduced motion: no pulse, no caret blink ---------- */

@media (prefers-reduced-motion: reduce) {
  .crew-status__dot,
  .console__caret {
    animation: none;
  }
}