/* RelayRoom styles.
   Palette: a deep pine ink control room. Amber is the signal color, cyan is
   data, green is joining, red is leaving, periwinkle is the fourth lane.
   Type: serif display over system body, monospace for anything numeric. */

:root {
  --bg: #0b1214;
  --panel: #101b1e;
  --panel-2: #152428;
  --panel-3: #1a2b30;
  --line: #24393e;
  --line-soft: #1b2d31;
  --text: #e9f1ec;
  --text-dim: #9fb5ae;
  --text-faint: #6c827d;

  --amber: #f2b441;
  --amber-ink: #221703;
  --cyan: #56c4cc;
  --green: #7fc98b;
  --red: #e0685a;
  --peri: #93a5ef;

  --lane-orchid: var(--amber);
  --lane-maple: var(--cyan);
  --lane-juniper: var(--green);
  --lane-cobalt: var(--peri);

  --font-display: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, ui-serif, serif;
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Mono", "Roboto Mono", Menlo, Consolas, monospace;

  --radius: 14px;
  --radius-small: 10px;
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: dark;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.55;
  color: var(--text);
  background:
    radial-gradient(1100px 520px at 10% -6%, rgba(242, 180, 65, 0.07), transparent 62%),
    radial-gradient(950px 620px at 104% 10%, rgba(86, 196, 204, 0.06), transparent 58%),
    var(--bg);
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(159, 181, 174, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(159, 181, 174, 0.045) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, black 0%, transparent 80%);
  mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, black 0%, transparent 80%);
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.015em;
  margin: 0;
}

h1 {
  font-size: clamp(1.8rem, 3.4vw, 2.5rem);
  line-height: 1.1;
}

h2 {
  font-size: 1.42rem;
  line-height: 1.2;
}

h3 {
  font-size: 1.05rem;
}

p {
  margin: 0;
}

a {
  color: var(--cyan);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--text);
}

code,
.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--amber);
  color: var(--amber-ink);
  padding: 0.55rem 0.9rem;
  border-radius: 0 0 10px 0;
  z-index: 10;
}

.skip-link:focus {
  left: 0;
}

/* Masthead */

.masthead {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.4rem 2.4rem;
  padding: 1.4rem clamp(1rem, 4vw, 2.4rem) 1.3rem;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(21, 36, 40, 0.55), rgba(16, 27, 30, 0));
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.brand-mark {
  color: var(--amber);
  flex: none;
}

.brand-line {
  color: var(--text-dim);
  font-size: 0.92rem;
  margin-top: 0.15rem;
}

.sim-badge {
  align-self: center;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.72rem;
  color: var(--text-dim);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.28rem 0.7rem;
  background: rgba(16, 27, 30, 0.6);
  white-space: nowrap;
}

.room-code {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.room-code-label {
  font-size: 0.8rem;
  color: var(--text-faint);
}

.code-row {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.code-tiles {
  display: flex;
  gap: 0.35rem;
}

.code-tile {
  width: 2.5rem;
  height: 2.9rem;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.35rem;
  color: var(--text);
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-small);
}

.code-tile.is-checksum {
  color: var(--amber);
  border-color: rgba(242, 180, 65, 0.55);
  box-shadow: 0 0 14px rgba(242, 180, 65, 0.18);
}

.transport {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  margin-left: auto;
}

.transport-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.speed-label {
  font-size: 0.85rem;
  color: var(--text-faint);
}

.sim-status {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.8rem;
  color: var(--text-dim);
  text-align: right;
}

/* Buttons and inputs */

.btn {
  font: inherit;
  font-size: 0.92rem;
  color: var(--text);
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-small);
  padding: 0.5rem 0.95rem;
  cursor: pointer;
  transition: background 140ms ease, border-color 140ms ease, transform 140ms ease;
}

.btn:hover {
  background: var(--panel-3);
  border-color: #33505a;
}

.btn:active {
  transform: translateY(1px);
}

.btn:focus-visible,
.chip:focus-visible,
.select:focus-visible,
.input:focus-visible,
.stream-scroll:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--amber);
  border-color: var(--amber);
  color: var(--amber-ink);
  font-weight: 650;
}

.btn-primary:hover {
  background: #f7c466;
  border-color: #f7c466;
}

.btn-quiet {
  background: transparent;
  border-color: transparent;
  color: var(--text-dim);
  padding: 0.4rem 0.6rem;
}

.btn-quiet:hover {
  color: var(--text);
  background: var(--panel-2);
  border-color: var(--line);
}

.btn-small {
  padding: 0.35rem 0.65rem;
  font-size: 0.82rem;
}

.btn:disabled {
  opacity: 0.55;
  cursor: wait;
}

.select,
.input {
  font: inherit;
  font-size: 0.92rem;
  color: var(--text);
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-small);
  padding: 0.5rem 0.65rem;
}

.input {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  width: min(100%, 16rem);
}

.input::placeholder {
  color: var(--text-faint);
  letter-spacing: 0.14em;
}

.chip {
  font: inherit;
  font-size: 0.8rem;
  color: var(--text-dim);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.3rem 0.75rem;
  cursor: pointer;
  transition: background 140ms ease, color 140ms ease;
}

.chip[aria-pressed="true"] {
  color: var(--text);
  background: var(--panel-3);
  border-color: #33505a;
}

.chip:hover {
  color: var(--text);
}

/* Layout */

main {
  padding: clamp(1.1rem, 3vw, 2.2rem) clamp(1rem, 4vw, 2.4rem) 2rem;
  display: flex;
  flex-direction: column;
  gap: clamp(1.4rem, 3vw, 2.2rem);
  max-width: 1280px;
  margin: 0 auto;
  width: 100%;
}

.zone {
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(1rem, 2.4vw, 1.5rem);
}

.zone-line {
  color: var(--text-dim);
  font-size: 0.95rem;
  max-width: 62ch;
  margin: 0.45rem 0 1.1rem;
}

.stage {
  display: grid;
  grid-template-columns: minmax(0, 360px) minmax(0, 1fr);
  gap: clamp(1rem, 2.4vw, 1.6rem);
  align-items: start;
}

.stage .zone {
  margin: 0;
}

.zone-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.6rem 1rem;
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

/* Client grid */

.device-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
}

.device-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-small);
  background: var(--panel);
  padding: 0.85rem 0.9rem 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.device-card[data-lane="orchid"] {
  --lane: var(--lane-orchid);
}

.device-card[data-lane="maple"] {
  --lane: var(--lane-maple);
}

.device-card[data-lane="juniper"] {
  --lane: var(--lane-juniper);
}

.device-card[data-lane="cobalt"] {
  --lane: var(--lane-cobalt);
}

.device-card {
  border-top: 3px solid var(--lane);
}

.device-head {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.device-icon {
  color: var(--lane);
  flex: none;
}

.device-name {
  font-weight: 650;
  font-size: 0.98rem;
  line-height: 1.2;
}

.device-kind {
  color: var(--text-faint);
  font-size: 0.8rem;
}

.device-status {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.72rem;
  color: var(--text-dim);
  white-space: nowrap;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 8px rgba(127, 201, 139, 0.7);
  animation: breathe 2.4s ease-in-out infinite;
}

.device-card[data-state="lagging"] .status-dot {
  background: var(--amber);
  box-shadow: 0 0 8px rgba(242, 180, 65, 0.7);
}

.device-card[data-state="offline"] .status-dot {
  background: var(--red);
  box-shadow: 0 0 8px rgba(224, 104, 90, 0.7);
  animation: none;
}

.device-card[data-state="stalled"] .status-dot {
  background: var(--amber);
  box-shadow: none;
  animation: none;
}

.device-blurb {
  color: var(--text-faint);
  font-size: 0.82rem;
}

.device-metrics {
  display: flex;
  gap: 0.9rem;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.78rem;
  color: var(--text-dim);
}

.device-metrics strong {
  color: var(--text);
  font-weight: 500;
}

.device-last {
  font-size: 0.84rem;
  color: var(--text-dim);
  border-left: 2px solid var(--line);
  padding-left: 0.55rem;
  min-height: 1.2em;
}

.device-action {
  align-self: flex-start;
}

@keyframes breathe {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.35;
  }
}

/* Relay stream */

.stream-scroll {
  height: min(56vh, 540px);
  overflow-y: auto;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-small);
  background: rgba(11, 18, 20, 0.55);
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}

.stream {
  list-style: none;
  margin: 0;
  padding: 0;
}

.event {
  display: grid;
  grid-template-columns: 3rem 4.7rem 4.6rem auto minmax(0, 1fr) auto;
  gap: 0.65rem;
  align-items: baseline;
  padding: 0.42rem 0.8rem;
  border-bottom: 1px solid var(--line-soft);
  border-left: 2px solid transparent;
  animation: rowIn 260ms ease-out;
}

.event[data-lane="orchid"] {
  --lane: var(--lane-orchid);
}

.event[data-lane="maple"] {
  --lane: var(--lane-maple);
}

.event[data-lane="juniper"] {
  --lane: var(--lane-juniper);
}

.event[data-lane="cobalt"] {
  --lane: var(--lane-cobalt);
}

.event[data-type="send"] {
  border-left-color: var(--lane);
}

.event[data-type="join"],
.event[data-type="leave"] {
  background: rgba(21, 36, 40, 0.5);
}

.event-seq {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.8rem;
  color: var(--cyan);
}

.event-time {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.8rem;
  color: var(--text-faint);
}

.event-lane {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--lane, var(--text-dim));
}

.event-type {
  justify-self: start;
  font-size: 0.72rem;
  color: var(--text-dim);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.05rem 0.5rem;
}

.event[data-type="send"] .event-type {
  color: var(--text);
}

.event[data-type="join"] .event-type {
  color: var(--green);
  border-color: rgba(127, 201, 139, 0.4);
}

.event[data-type="leave"] .event-type {
  color: var(--red);
  border-color: rgba(224, 104, 90, 0.4);
}

.event[data-type="heartbeat"] .event-type {
  color: var(--text-faint);
}

.event-content {
  min-width: 0;
  overflow-wrap: anywhere;
  font-size: 0.92rem;
}

.event-meta {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.72rem;
  color: var(--text-faint);
  margin-top: 0.1rem;
}

.event[data-stale="true"] .event-content {
  color: var(--red);
}

/* The fan out strip: four cells, one per lane, lit when the lane held it. */

.fanout {
  display: flex;
  gap: 4px;
  align-items: center;
  align-self: center;
}

.fanout .cell {
  width: 9px;
  height: 9px;
  border-radius: 2px;
  background: var(--line-soft);
}

.fanout .cell.is-lit {
  background: var(--cell-lane, var(--text-dim));
  opacity: 0.9;
}

.fanout .cell.is-self {
  background: transparent;
  box-shadow: inset 0 0 0 1.5px var(--cell-lane, var(--text-dim));
}

@keyframes rowIn {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* Message Lab */

.lab-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(1rem, 2.4vw, 1.6rem);
}

.lab-pane {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-small);
  background: rgba(11, 18, 20, 0.5);
  padding: 0.9rem 1rem 1rem;
  min-width: 0;
}

.pane-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  margin-bottom: 0.7rem;
}

.pane-head-split {
  margin-top: 1rem;
  border-top: 1px solid var(--line-soft);
  padding-top: 0.8rem;
}

.preset-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.lab-code {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.82rem;
  color: var(--amber);
}

.lab-steps {
  list-style: none;
  margin: 0 0 0.9rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-height: 300px;
  overflow-y: auto;
}

.lab-step {
  display: grid;
  grid-template-columns: 1.6rem auto auto minmax(0, 1fr) auto;
  gap: 0.5rem;
  align-items: center;
  background: var(--panel);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-small);
  padding: 0.45rem 0.6rem;
}

.lab-step .step-no {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.8rem;
  color: var(--text-faint);
}

.lab-step .select,
.lab-step .input {
  padding: 0.35rem 0.5rem;
  font-size: 0.85rem;
}

.lab-step .input {
  letter-spacing: normal;
  text-transform: none;
  min-width: 0;
  width: 100%;
}

.step-remove {
  font: inherit;
  font-size: 0.85rem;
  color: var(--text-faint);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 0.2rem 0.5rem;
  cursor: pointer;
}

.step-remove:hover {
  color: var(--red);
  border-color: var(--line);
}

.step-remove:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

.lab-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.lab-status {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.78rem;
  color: var(--text-dim);
  text-align: right;
}

.lab-trace {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  max-height: 280px;
  overflow-y: auto;
}

.trace-entry {
  display: grid;
  grid-template-columns: 1.7rem minmax(0, 1fr);
  gap: 0.55rem;
  padding: 0.45rem 0.6rem;
  background: var(--panel);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--green);
  border-radius: 8px;
  font-size: 0.88rem;
  animation: rowIn 220ms ease-out;
}

.trace-entry .step-no {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.8rem;
  color: var(--text-faint);
  padding-top: 0.1rem;
}

.trace-entry .trace-op {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.74rem;
  color: var(--text-faint);
  margin-top: 0.15rem;
}

.trace-entry[data-ok="false"] {
  border-left-color: var(--red);
}

.trace-entry[data-op="advance"] {
  border-left-color: var(--cyan);
}

.trace-entry[data-op="replay"] {
  border-left-color: var(--peri);
}

.lab-stream {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 240px;
  overflow-y: auto;
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  background: rgba(11, 18, 20, 0.55);
}

.lab-stream .event {
  grid-template-columns: 2.6rem 4.2rem 4rem auto minmax(0, 1fr) auto;
  font-size: 0.86rem;
}

/* Code Validator */

.validator-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(1rem, 2.4vw, 1.6rem);
}

.field-label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-faint);
  margin-bottom: 0.45rem;
}

.verdict {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.85rem;
  margin: 0.7rem 0 0.9rem;
  min-height: 1.3em;
}

.verdict[data-valid="true"] {
  color: var(--green);
}

.verdict[data-valid="false"] {
  color: var(--red);
}

.checks {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.check {
  display: grid;
  grid-template-columns: 6.2rem minmax(0, 1fr);
  gap: 0.7rem;
  align-items: baseline;
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--line);
  border-radius: 8px;
  padding: 0.45rem 0.7rem;
  background: var(--panel);
}

.check dt {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.78rem;
  color: var(--text-dim);
}

.check dd {
  margin: 0;
  font-size: 0.88rem;
  color: var(--text-dim);
}

.check[data-state="pass"] {
  border-left-color: var(--green);
}

.check[data-state="fail"] {
  border-left-color: var(--red);
}

.check[data-state="fail"] dd {
  color: var(--text);
}

.validator-sweep {
  border: 1px dashed var(--line);
  border-radius: var(--radius-small);
  padding: 1rem 1.1rem;
  background: rgba(21, 36, 40, 0.35);
}

.validator-sweep p {
  color: var(--text-dim);
  font-size: 0.92rem;
  margin: 0.5rem 0 0.9rem;
  max-width: 46ch;
}

.sweep-results {
  margin: 1rem 0 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 0.6rem;
}

.sweep-results > div {
  background: var(--panel);
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  padding: 0.5rem 0.7rem;
}

.sweep-results dt {
  font-size: 0.72rem;
  color: var(--text-faint);
}

.sweep-results dd {
  margin: 0.15rem 0 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.05rem;
  color: var(--amber);
}

/* How The Engine Works */

.engine-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 0.8rem;
}

.engine-card {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-small);
  background: var(--panel);
  padding: 0.95rem 1rem;
}

.engine-card p {
  color: var(--text-dim);
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

.transport-note {
  margin-top: 1.1rem;
  padding: 0.85rem 1rem;
  border: 1px solid rgba(242, 180, 65, 0.3);
  border-radius: var(--radius-small);
  background: rgba(242, 180, 65, 0.05);
  color: var(--text-dim);
  font-size: 0.92rem;
  max-width: 90ch;
}

/* Footer */

.footer {
  border-top: 1px solid var(--line);
  padding: 1.4rem clamp(1rem, 4vw, 2.4rem) 2rem;
  color: var(--text-faint);
  font-size: 0.88rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 2rem;
  justify-content: space-between;
}

.footer p {
  max-width: 78ch;
}

/* Responsive */

@media (max-width: 1020px) {
  .stage {
    grid-template-columns: minmax(0, 1fr);
  }

  .lab-grid,
  .validator-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .transport {
    margin-left: 0;
  }

  .sim-status {
    text-align: left;
  }
}

@media (max-width: 640px) {
  .device-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .event {
    grid-template-columns: 2.6rem 4rem auto minmax(0, 1fr) auto;
  }

  .event .event-lane {
    display: none;
  }

  .event[data-type="send"] .event-content::before {
    content: attr(data-lane-name) ": ";
    color: var(--lane);
    font-weight: 600;
  }

  .lab-step {
    grid-template-columns: 1.6rem minmax(0, 1fr) auto;
    grid-auto-rows: auto;
  }

  .lab-step .select {
    grid-column: 2;
  }

  .code-tile {
    width: 2.2rem;
    height: 2.6rem;
    font-size: 1.15rem;
  }
}

/* Reduced motion */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}