/* Playground. Four panels that show the engine working, not a terminal that
 * shows text scrolling.
 *
 * The one animation on this page is the TTL bar draining, and it is not a
 * flourish — it is the engine's clock, redrawn from pttl() at 10 Hz. Everything
 * else holds still so that when something moves, it means something changed.
 */

.grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 1px;
  background: var(--edge);
  border: 1px solid var(--edge);
  border-radius: 4px;
  margin: 2.5rem 0 4rem;
  overflow: hidden;
}
.span2 {
  grid-column: 1 / -1;
}

.panel {
  background: var(--void);
  padding: 1.25rem 1.4rem 1.4rem;
  min-width: 0;
}
.panel-h {
  margin-bottom: 1rem;
}
.panel h2 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  font-weight: 600;
  color: var(--text-3);
  margin: 0 0 0.4rem;
}
.hint {
  margin: 0;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--text-3);
  max-width: 72ch;
}

/* ── boot ───────────────────────────────────────────────────────────────── */

.boot {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 3rem 0;
  color: var(--text-3);
  font-size: 0.9375rem;
}
.spin {
  width: 12px;
  height: 12px;
  border: 2px solid var(--edge-hi);
  border-top-color: var(--blue);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}
.fail {
  color: var(--thin);
  font-weight: 600;
}
@media (prefers-reduced-motion: reduce) {
  .spin {
    animation: none;
  }
}

/* ── keyspace ───────────────────────────────────────────────────────────── */

.ks-wrap {
  overflow-x: auto;
  border: 1px solid var(--edge);
  border-radius: 3px;
  max-height: 22rem;
  overflow-y: auto;
}
table.ks {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}
table.ks th {
  position: sticky;
  top: 0;
  z-index: 1;
  text-align: left;
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  font-weight: 600;
  color: var(--text-3);
  background: var(--deep);
  padding: 0.55rem 0.8rem;
  border-bottom: 1px solid var(--edge);
}
table.ks td {
  padding: 0.5rem 0.8rem;
  border-bottom: 1px solid var(--edge);
  vertical-align: middle;
}
table.ks tr:last-child td {
  border-bottom: 0;
}
table.ks tbody tr:not(.empty) {
  cursor: pointer;
}
table.ks tbody tr:not(.empty):hover {
  background: var(--lift);
}
td.k {
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--text);
  white-space: nowrap;
  font-weight: 600;
}
td.v {
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--text-2);
  word-break: break-all;
  min-width: 12rem;
}
td.t {
  width: 11rem;
}
tr.empty td {
  color: var(--text-3);
  padding: 2rem 0.8rem;
  text-align: center;
  font-size: 0.875rem;
}

/* A key that just appeared, and a key whose value just changed, say so once and
 * then stop. Without this the table is a wall of text that silently rearranges
 * itself and the reader misses the thing they pressed a button to see. */
@keyframes flash-in {
  from {
    background: var(--blue-wash);
  }
}
@keyframes flash-ch {
  from {
    background: var(--thin-wash);
  }
}
tr.fresh {
  animation: flash-in 1.1s ease-out;
}
tr.changed {
  animation: flash-ch 1.1s ease-out;
}
@media (prefers-reduced-motion: reduce) {
  tr.fresh,
  tr.changed {
    animation: none;
  }
}

/* ── the TTL bar ────────────────────────────────────────────────────────── */

.ttl {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.ttl-n {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--text-2);
  min-width: 3.4rem;
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.ttl-bar {
  flex: 1;
  height: 3px;
  background: var(--edge-hi);
  border-radius: 2px;
  overflow: hidden;
}
.ttl-bar i {
  display: block;
  height: 100%;
  background: var(--blue);
  transition: width 0.1s linear;
}
.ttl.urgent .ttl-n {
  color: var(--thin);
  font-weight: 600;
}
.ttl.urgent .ttl-bar i {
  background: var(--thin);
}
.dim {
  color: var(--text-3);
  font-size: 0.75rem;
}

/* ── forms & buttons ────────────────────────────────────────────────────── */

.wform {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.9rem;
  flex-wrap: wrap;
}
.wform input {
  font: inherit;
  font-family: var(--mono);
  font-size: 0.8125rem;
  padding: 0.45rem 0.6rem;
  background: var(--lift);
  color: var(--text);
  border: 1px solid var(--edge-hi);
  border-radius: 3px;
  min-width: 0;
}
#wk,
#pm {
  flex: 1 1 9rem;
}
#wv {
  flex: 2 1 12rem;
}
#wt,
#pc {
  flex: 0 1 6.5rem;
}
.wform input:focus {
  outline: 2px solid var(--blue);
  outline-offset: -1px;
  border-color: var(--blue);
}

.btn {
  font: inherit;
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--edge-hi);
  border-radius: 3px;
  background: var(--lift);
  color: var(--text);
  cursor: pointer;
  white-space: nowrap;
}
.btn:hover:not(:disabled) {
  border-color: var(--blue);
  color: var(--blue);
}
.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}
.btn.primary {
  background: var(--blue);
  border-color: var(--blue);
  color: var(--void);
}
.btn.primary:hover {
  background: var(--blue-dim);
  border-color: var(--blue-dim);
  color: var(--void);
}
.btn:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}
.row {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.9rem;
  flex-wrap: wrap;
}

/* ── scenarios ──────────────────────────────────────────────────────────── */

.scen {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}
.scen-note {
  margin: 0.9rem 0 0;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--text-2);
  min-height: 3.2em;
}

/* ── stats ──────────────────────────────────────────────────────────────── */

.stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9rem 1rem;
  margin: 0 0 1.1rem;
}
.stats dt {
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-3);
  margin-bottom: 0.2rem;
}
.stats dd {
  margin: 0;
  font-size: 1.0625rem;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}
.stats dd.warn {
  color: var(--thin);
  font-size: 0.9375rem;
}

/* ── the log ────────────────────────────────────────────────────────────── */

.aof {
  margin: 0;
  padding: 0.9rem 1rem;
  background: var(--deep);
  border: 1px solid var(--edge);
  border-radius: 3px;
  font-family: var(--mono);
  font-size: 0.75rem;
  line-height: 1.7;
  color: var(--text-2);
  max-height: 15rem;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

/* ── pub/sub feed ───────────────────────────────────────────────────────── */

.feed {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--edge);
  border: 1px solid var(--edge);
  border-radius: 3px;
  overflow: hidden;
  min-height: 4rem;
}
.feed li {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.55rem 0.8rem;
  background: var(--void);
  font-size: 0.8125rem;
  animation: flash-in 1.1s ease-out;
}
.feed li.waiting {
  color: var(--text-3);
  animation: none;
  justify-content: center;
}
.feed .ch {
  font-family: var(--mono);
  font-size: 0.6875rem;
  padding: 0.1rem 0.4rem;
  border-radius: 2px;
  background: var(--deep);
  border: 1px solid var(--edge-hi);
  color: var(--text-3);
  white-space: nowrap;
}
.feed .msg {
  flex: 1;
  color: var(--text);
  word-break: break-word;
}
.feed .src {
  font-size: 0.6875rem;
  color: var(--text-3);
  white-space: nowrap;
}
/* A message that arrived from the other tab is the whole point of the panel, so
 * it is the one that gets the accent. */
.feed li.other .src {
  color: var(--blue);
  font-weight: 600;
}
.feed li.other .ch {
  border-color: var(--blue);
  color: var(--blue);
}
@media (prefers-reduced-motion: reduce) {
  .feed li {
    animation: none;
  }
}

/* ── tablet & phone ─────────────────────────────────────────────────────── */

@media (max-width: 60rem) {
  .grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 40rem) {
  .panel {
    padding: 1rem 1rem 1.2rem;
  }
  .wform input,
  .btn {
    flex-basis: 100%;
  }
  #wt,
  #pc {
    flex-basis: calc(50% - 0.25rem);
  }
  .scen {
    grid-template-columns: 1fr;
  }
  .stats {
    grid-template-columns: 1fr 1fr;
  }
  td.t {
    width: 8rem;
  }
  .ttl-n {
    min-width: 2.8rem;
  }
  /* The key column stays put while the value scrolls, so a row never loses its
   * subject on a narrow screen. */
  td.k {
    position: sticky;
    left: 0;
    background: var(--void);
    border-right: 1px solid var(--edge);
  }
  .feed li {
    flex-wrap: wrap;
    gap: 0.4rem;
  }
}

/* The CRLF that ends every RESP frame. Spelled out rather than shown as U+240D,
 * which most monospace faces do not have a glyph for and render as tofu. */
.aof .crlf {
  color: var(--text-3);
  opacity: 0.55;
  font-style: normal;
}

/* The feed sizes to its contents. A min-height painted an empty strip of the
 * container's rule colour under the last message, which read as a broken row. */
.feed {
  min-height: 0;
}