/* crossbook playground. Colors are tokens on :root; the dark theme redefines them.
   Every bid/ask text pairing below was checked for WCAG AA (4.5:1) in both themes. */

:root {
  color-scheme: light;

  --canvas: #eceef2;
  --panel: #ffffff;
  --panel-2: #f5f6f8;
  --track: #eef0f3;
  --track-hover: #e4e7ec;
  --seg-on: #ffffff;
  --seg-on-line: #8d95a1;
  --line: #dde1e6;
  --line-strong: #8d95a1;
  --chip-line: #c5cbd3;
  --rule: #eef0f3;
  --ink: #14171d;
  --ink-hover: #2c313b;
  --ink-2: #454d5a;
  --ink-3: #5e6673;

  --bid: #0a6c4b;
  --bid-solid: #0a6c4b;
  --bid-solid-hover: #085a3e;
  --bid-bg: #e7f0ed;
  --bid-bar: rgb(10 108 75 / 0.16);
  --on-bid-solid: #ffffff;
  --ask: #b42419;
  --ask-solid: #b42419;
  --ask-solid-hover: #981e15;
  --ask-bg: #f8e9e8;
  --ask-bar: rgb(180 36 25 / 0.16);
  --on-ask-solid: #ffffff;

  --danger: #a3201a;
  --danger-bg: #f6e9e8;
  --on-danger: #ffffff;
  --warn: #8a5300;
  --info: #2c47b8;
  --ok: #0a6c4b;
  --ok-bg: #e7f0ed;

  --band: #14171d;
  --on-band: #f3f5f8;
  --band-muted: #aeb6c2;

  --focus: #2f55d4;
  --hl: #c27c00;
  --hl-bg: #fff1c7;

  --shadow-1: 0 1px 2px rgb(16 20 26 / 0.08);
  --scroll-shadow: rgb(20 23 29 / 0.16);

  --font-ui:
    system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', 'Noto Sans', Arial, sans-serif;
  --font-mono:
    ui-monospace, 'SF Mono', SFMono-Regular, 'Cascadia Mono', 'Segoe UI Mono', 'Roboto Mono', Menlo, Consolas,
    'Liberation Mono', 'DejaVu Sans Mono', monospace;

  /* 4px spacing scale */
  --s1: 4px;
  --s2: 8px;
  --s3: 12px;
  --s4: 16px;
  --s5: 20px;
  --s6: 24px;
  --s7: 32px;

  --r-sm: 4px;
  --r-md: 6px;
  --r-lg: 8px;

  --ctl: 36px;
  --ctl-inner: 30px;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;

    --canvas: #0c0f13;
    --panel: #14181e;
    --panel-2: #1a1f27;
    --track: #0f1318;
    --track-hover: #1c222b;
    --seg-on: #2a313c;
    --seg-on-line: #6f7886;
    --line: #262c36;
    --line-strong: #5c6573;
    --chip-line: #3a424e;
    --rule: #1d222a;
    --ink: #e6e9ee;
    --ink-hover: #cfd4dc;
    --ink-2: #b0b7c2;
    --ink-3: #8f98a5;

    --bid: #47c597;
    --bid-solid: #157a55;
    --bid-solid-hover: #188560;
    --bid-bg: #1b302f;
    --bid-bar: rgb(71 197 151 / 0.2);
    --on-bid-solid: #ffffff;
    --ask: #ff8a7c;
    --ask-solid: #b8372c;
    --ask-solid-hover: #c4433a;
    --ask-bg: #35282b;
    --ask-bar: rgb(255 138 124 / 0.2);
    --on-ask-solid: #ffffff;

    --danger: #ff9286;
    --danger-bg: #35292d;
    --on-danger: #330b06;
    --warn: #e9b44c;
    --info: #9db0ff;
    --ok: #47c597;
    --ok-bg: #1b302f;

    --band: #252c37;
    --on-band: #eef1f5;
    --band-muted: #a9b1bd;

    --focus: #8aa4ff;
    --hl: #e3ac2f;
    --hl-bg: #3a2f12;

    --shadow-1: 0 1px 2px rgb(0 0 0 / 0.45);
    --scroll-shadow: rgb(0 0 0 / 0.7);
  }
}

/* Base */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--canvas);
  color: var(--ink);
  font: 14px/1.45 var(--font-ui);
  -webkit-font-smoothing: antialiased;
}

button,
input,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
}

button:disabled,
button[aria-disabled='true'] {
  cursor: default;
}

a {
  color: inherit;
  text-underline-offset: 3px;
}

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

[hidden] {
  display: none !important;
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.right {
  text-align: right;
}

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

.icon {
  width: 14px;
  height: 14px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Header */

.site-header {
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}

.site-header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--s3) var(--s7);
  max-width: 1480px;
  margin: 0 auto;
  padding: var(--s4) var(--s6);
}

.wordmark {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font: 700 22px/1.1 var(--font-mono);
  letter-spacing: -0.03em;
}

.wordmark-mark {
  width: 20px;
  height: 20px;
  flex: none;
}

.mark-ask {
  fill: var(--ask);
}

.mark-bid {
  fill: var(--bid);
}

.tagline {
  margin: 6px 0 0;
  color: var(--ink-2);
  font-size: 14.5px;
}

.header-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s2) var(--s5);
}

.header-links a {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  min-height: 32px;
  font-weight: 600;
  text-decoration: none;
  color: var(--ink);
}

.header-links a:hover {
  text-decoration: underline;
}

.header-links .icon {
  color: var(--ink-3);
}

/* Workspace grid. Single column below 1100px, in DOM order. */

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas:
    'ticket'
    'book'
    'selection'
    'scenarios'
    'log'
    'stress';
  gap: var(--s4);
  max-width: 760px;
  margin: 0 auto;
  padding: var(--s5) var(--s4) var(--s6);
}

.ticket {
  grid-area: ticket;
}
.book {
  grid-area: book;
}
.selection {
  grid-area: selection;
}
.scenarios {
  grid-area: scenarios;
}
.log {
  grid-area: log;
}
.stress {
  grid-area: stress;
}

@media (min-width: 1100px) {
  .workspace {
    grid-template-columns: minmax(288px, 0.85fr) minmax(400px, 1.4fr) minmax(300px, 1fr);
    grid-template-rows: auto 1fr auto auto;
    grid-template-areas:
      'ticket    book      log'
      'selection book      log'
      'scenarios scenarios scenarios'
      'stress    stress    stress';
    max-width: 1480px;
    padding: var(--s5) var(--s6) var(--s6);
  }
}

/* Panels */

.panel {
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s3);
  min-height: 48px;
  padding: var(--s2) var(--s4);
  border-bottom: 1px solid var(--line);
}

.panel-head h2 {
  margin: 0;
  font-size: 15px;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.panel-meta {
  color: var(--ink-3);
  font-size: 12px;
  text-align: right;
}

.panel-body {
  padding: var(--s4);
}

.panel-note {
  margin: 0;
  padding: var(--s3) var(--s4) 0;
  color: var(--ink-3);
  font-size: 12.5px;
}

.empty-note {
  margin: 0;
  color: var(--ink-3);
  font-size: 13px;
}

.empty-note:focus {
  outline: none;
}

.empty-note:focus-visible {
  outline: 2px solid var(--focus);
}

/* Form controls */

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.field-wide {
  grid-column: 1 / -1;
}

.label {
  color: var(--ink-2);
  font-size: 12px;
  font-weight: 600;
  line-height: 1.2;
}

.input {
  width: 100%;
  height: var(--ctl);
  padding: 0 10px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-md);
  background: var(--panel);
  color: var(--ink);
  font-size: 14px;
}

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

.input:focus-visible {
  outline-offset: 1px;
}

input[type='number'] {
  -moz-appearance: textfield;
  appearance: textfield;
}

input[type='number']::-webkit-inner-spin-button,
input[type='number']::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.select-wrap {
  position: relative;
  display: block;
}

.select {
  appearance: none;
  padding-right: 34px;
  text-overflow: ellipsis;
  cursor: pointer;
}

.select-wrap::after {
  content: '';
  position: absolute;
  top: 50%;
  right: 14px;
  width: 7px;
  height: 7px;
  border-right: 1.5px solid var(--ink-2);
  border-bottom: 1.5px solid var(--ink-2);
  transform: translateY(-70%) rotate(45deg);
  pointer-events: none;
}

/* Segmented control: a group of toggle buttons with aria-pressed. */

.seg {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(0, 1fr);
  gap: 2px;
  padding: 2px;
  background: var(--track);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
}

.seg button {
  min-width: 0;
  min-height: var(--ctl-inner);
  padding: 0 4px;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  background: transparent;
  color: var(--ink-2);
  font-size: 13px;
  font-weight: 600;
  line-height: 1;
  white-space: nowrap;
}

.seg button:hover {
  background: var(--track-hover);
  color: var(--ink);
}

.seg button[aria-pressed='true'] {
  background: var(--seg-on);
  border-color: var(--seg-on-line);
  color: var(--ink);
  box-shadow: var(--shadow-1);
}

.seg-side button[data-value='buy'][aria-pressed='true'] {
  background: var(--bid-bg);
  border-color: var(--bid);
  color: var(--bid);
}

.seg-side button[data-value='sell'][aria-pressed='true'] {
  background: var(--ask-bg);
  border-color: var(--ask);
  color: var(--ask);
}

.seg-count button {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  letter-spacing: -0.02em;
}

/* Stepper: price with one-tick buttons */

.stepper {
  display: grid;
  grid-template-columns: var(--ctl) minmax(0, 1fr) var(--ctl);
  height: var(--ctl);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-md);
  background: var(--panel);
  overflow: hidden;
}

.stepper input {
  width: 100%;
  min-width: 0;
  height: 100%;
  padding: 0 4px;
  border: 0;
  background: transparent;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 14px;
  font-variant-numeric: tabular-nums;
  text-align: center;
}

.stepper input:focus-visible,
.stepper .step:focus-visible {
  outline-offset: -2px;
}

.step {
  display: grid;
  place-items: center;
  padding: 0;
  border: 0;
  background: var(--panel-2);
  color: var(--ink-2);
}

.step:first-child {
  border-right: 1px solid var(--line);
}

.step:last-child {
  border-left: 1px solid var(--line);
}

.step:hover:not(:disabled) {
  background: var(--track-hover);
  color: var(--ink);
}

.step svg {
  width: 14px;
  height: 14px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
}

.stepper.is-disabled {
  border-color: var(--line);
  background: var(--panel-2);
}

.stepper.is-disabled input,
.stepper.is-disabled .step {
  color: var(--ink-3);
}

.stepper.is-flashed {
  animation: field-flash 0.9s ease-out;
}

@keyframes field-flash {
  from {
    background-color: var(--hl-bg);
    box-shadow: 0 0 0 2px var(--hl);
  }
}

/* Checkbox row */

.check {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--panel-2);
  cursor: pointer;
}

.check input {
  flex: none;
  width: 16px;
  height: 16px;
  margin: 2px 0 0;
  accent-color: var(--ink);
}

.check-title {
  display: block;
  font-weight: 600;
  line-height: 1.3;
}

.check-desc {
  display: block;
  color: var(--ink-2);
  font-size: 12.5px;
  line-height: 1.4;
}

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: var(--ctl);
  padding: 0 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-md);
  background: var(--panel);
  color: var(--ink);
  font-size: 13.5px;
  font-weight: 600;
  line-height: 1.2;
  text-align: center;
}

.btn:hover:not(:disabled, [aria-disabled='true']) {
  background: var(--panel-2);
}

.btn-primary {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--panel);
}

.btn-primary:hover:not(:disabled, [aria-disabled='true']) {
  background: var(--ink-hover);
  border-color: var(--ink-hover);
}

.btn-quiet {
  border-color: transparent;
  background: transparent;
  color: var(--ink-2);
}

.btn-quiet:hover:not(:disabled, [aria-disabled='true']) {
  color: var(--ink);
}

.btn-danger {
  color: var(--danger);
}

.btn-small {
  min-height: 30px;
  padding: 0 10px;
  font-size: 12.5px;
}

.btn-block {
  width: 100%;
}

.btn:disabled {
  opacity: 0.5;
}

#stress-run[aria-disabled='true'] {
  opacity: 0.6;
  cursor: progress;
}

.btn .icon {
  width: 15px;
  height: 15px;
}

/* Order ticket */

.ticket-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--s4) var(--s3);
}

.submit {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 46px;
  margin-top: var(--s4);
  padding: 0 var(--s4);
  border: 0;
  border-radius: var(--r-md);
  font-size: 15.5px;
  font-weight: 650;
  line-height: 1.2;
}

.submit .num {
  font-size: 15px;
}

.submit.is-buy {
  background: var(--bid-solid);
  color: var(--on-bid-solid);
}

.submit.is-buy:hover:not(:disabled) {
  background: var(--bid-solid-hover);
}

.submit.is-sell {
  background: var(--ask-solid);
  color: var(--on-ask-solid);
}

.submit.is-sell:hover:not(:disabled) {
  background: var(--ask-solid-hover);
}

.submit:disabled {
  opacity: 0.55;
}

.submit:focus-visible {
  outline-offset: 3px;
}

.submit-quals {
  font-weight: 500;
}

.ticket-result {
  margin: var(--s3) 0 0;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--panel-2);
  color: var(--ink);
  font-size: 12.5px;
  line-height: 1.45;
}

.ticket-result.is-rejected {
  border-color: var(--danger);
  background: var(--danger-bg);
  color: var(--danger);
}

.ticket-hint {
  min-height: 2.9em;
  margin: var(--s2) 0 0;
  color: var(--ink-2);
  font-size: 12.5px;
  line-height: 1.45;
}

/* Order book ladder */

.book {
  min-height: 0;
}

.ladder {
  --row-h: 30px;
  --c-side: 2.6rem;
  --c-price: 4.25rem;
  --c-qty: 6.25rem;
  --c-gap: 10px;
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  min-height: 0;
  padding-top: var(--s3);
}

.ladder:focus {
  outline: none;
}

.ladder-cols {
  display: grid;
  grid-template-columns: var(--c-side) var(--c-price) var(--c-qty) minmax(0, 1fr);
  column-gap: var(--c-gap);
  padding: 0 var(--s4) 6px;
  border-bottom: 1px solid var(--line);
  color: var(--ink-3);
  font-size: 10.5px;
  font-weight: 650;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
}

.ladder-cols span:last-child {
  padding-left: 2px;
}

.ladder-side {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  margin: 0;
  padding: 0;
  list-style: none;
}

.asks {
  justify-content: flex-end;
}

.bids {
  justify-content: flex-start;
}

/* Hairline rules between rows, including empty slots, so the ladder reads as a fixed frame. */
.ladder-side > li + li {
  border-top: 1px solid var(--rule);
}

.slot {
  height: var(--row-h);
}

.side-empty {
  display: flex;
  align-items: center;
  min-height: var(--row-h);
  padding: 0 var(--s4);
  color: var(--ink-3);
  font-size: 12.5px;
}

.level {
  display: grid;
  grid-template-columns: calc(var(--c-side) + var(--c-price) + var(--c-qty) + 2 * var(--c-gap) + 8px) minmax(0, 1fr);
  column-gap: var(--c-gap);
  align-items: center;
  min-height: var(--row-h);
  padding: 1px var(--s3);
}

.level-btn {
  display: grid;
  grid-template-columns: var(--c-side) var(--c-price) var(--c-qty);
  column-gap: var(--c-gap);
  align-items: center;
  height: calc(var(--row-h) - 2px);
  padding: 0 4px;
  border: 0;
  border-radius: var(--r-sm);
  background: transparent;
  color: var(--ink);
  text-align: left;
}

.level-btn:hover {
  background: var(--panel-2);
}

.side-tag {
  padding: 3px 0 2px;
  border-radius: 3px;
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.2;
  text-align: center;
  text-transform: uppercase;
}

.is-ask .side-tag {
  background: var(--ask-bg);
  color: var(--ask);
}

.is-bid .side-tag {
  background: var(--bid-bg);
  color: var(--bid);
}

.level-price {
  font-size: 14.5px;
  font-weight: 650;
  text-align: right;
}

.is-ask .level-price {
  color: var(--ask);
}

.is-bid .level-price {
  color: var(--bid);
}

.level-qty {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  height: 20px;
  padding-right: 6px;
  border-radius: 3px;
  font-size: 13px;
}

.level-qty .num {
  position: relative;
}

.level-bar {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: calc(var(--w, 0) * 100%);
  min-width: 3px;
  border-radius: 3px;
}

.is-ask .level-bar {
  background: var(--ask-bar);
}

.is-bid .level-bar {
  background: var(--bid-bar);
}

.level-qty.is-changed {
  animation: field-flash 1.4s ease-out;
}

.queue {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  min-width: 0;
  padding: 3px 0;
}

.chip {
  display: inline-flex;
  flex: none;
  align-items: center;
  gap: 5px;
  height: 22px;
  padding: 0 7px;
  border: 1px solid var(--chip-line);
  border-radius: var(--r-sm);
  background: var(--panel);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  white-space: nowrap;
}

.chip:hover {
  border-color: var(--line-strong);
  background: var(--panel-2);
}

.chip-id {
  color: var(--ink-2);
}

.chip-acct {
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 700;
  color: var(--ink-2);
}

.chip-qty {
  font-weight: 650;
}

.chip-po {
  font-family: var(--font-ui);
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--ink-3);
}

.chip[aria-pressed='true'] {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--panel);
}

.chip[aria-pressed='true'] .chip-id,
.chip[aria-pressed='true'] .chip-acct,
.chip[aria-pressed='true'] .chip-po {
  color: inherit;
}

.chip.is-touched {
  animation: chip-flash 1.8s ease-out;
}

@keyframes chip-flash {
  0%,
  35% {
    background-color: var(--hl-bg);
    border-color: var(--hl);
    box-shadow: 0 0 0 1px var(--hl);
  }
}

.chip[aria-pressed='true'].is-touched {
  animation-name: chip-ring;
}

@keyframes chip-ring {
  0%,
  35% {
    box-shadow: 0 0 0 2px var(--hl);
  }
}

/* The spread band separates asks from bids. */

.spread {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 2px var(--s4);
  min-height: 40px;
  padding: 6px var(--s4);
  background: var(--band);
  color: var(--on-band);
  font-size: 12.5px;
}

.spread-item {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
}

.spread-label {
  color: var(--band-muted);
  font-size: 10.5px;
  font-weight: 650;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.spread .num {
  font-size: 14px;
  font-weight: 650;
}

.spread-muted {
  color: var(--band-muted);
}

.spread.is-traded .spread-last {
  animation: band-flash 1.4s ease-out;
}

@keyframes band-flash {
  from {
    color: var(--hl);
  }
}

.ladder-foot {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 4px var(--s4);
  margin: 0;
  padding: 10px var(--s4);
  border-top: 1px solid var(--line);
  color: var(--ink-3);
  font-size: 12px;
}

.foot-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 4px var(--s4);
}

.ladder-foot .num {
  color: var(--ink-2);
}

/* Selected order */

.selection .panel-body {
  flex: 1 1 auto;
}

.sel-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
  margin: 0 0 var(--s3);
  font-size: 13.5px;
}

.sel-id {
  display: inline-flex;
  align-items: center;
  height: 24px;
  padding: 0 8px;
  border-radius: var(--r-sm);
  background: var(--ink);
  color: var(--panel);
  font-size: 13px;
  font-weight: 650;
}

.sel-text .is-bid-text {
  color: var(--bid);
  font-weight: 650;
}

.sel-text .is-ask-text {
  color: var(--ask);
  font-weight: 650;
}

.modify-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--s3) var(--s3);
  align-items: end;
}

.modify-form .btn {
  width: 100%;
}

.hint {
  margin: var(--s3) 0 0;
  color: var(--ink-3);
  font-size: 12px;
}

/* Guided scenarios */

.scenarios-body {
  display: grid;
  flex: 1 1 auto;
  grid-template-columns: minmax(210px, 270px) minmax(0, 1fr);
}

.scenario-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin: 0;
  padding: var(--s2);
  border-right: 1px solid var(--line);
  list-style: none;
}

.scenario-list button {
  display: flex;
  align-items: center;
  width: 100%;
  min-height: 38px;
  padding: 8px 12px;
  border: 0;
  border-radius: var(--r-md);
  background: transparent;
  color: var(--ink-2);
  font-size: 13.5px;
  font-weight: 550;
  line-height: 1.3;
  text-align: left;
}

.scenario-list button:hover {
  background: var(--panel-2);
  color: var(--ink);
}

.scenario-list button[aria-current='true'] {
  background: var(--panel-2);
  color: var(--ink);
  font-weight: 650;
  box-shadow: inset 3px 0 0 var(--ink);
}

.scenario-detail {
  container-type: inline-size;
  min-width: 0;
  padding: var(--s5) var(--s6) var(--s6);
}

/* Wide: the step on the left, what it did on the right. */
@container (min-width: 760px) {
  .sc-content {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: var(--s7);
    align-items: start;
  }

  .sc-side .sc-explain {
    margin-top: 0;
  }

  .sc-side .sc-waiting {
    margin-top: 0;
    padding: var(--s3) var(--s4);
    border: 1px dashed var(--line-strong);
    border-radius: var(--r-md);
  }
}

.sc-title {
  margin: 0 0 6px;
  color: var(--ink-3);
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.sc-rule {
  max-width: 60ch;
  margin: 0 0 var(--s4);
  font-size: 19px;
  font-weight: 650;
  letter-spacing: -0.015em;
  line-height: 1.35;
  text-wrap: pretty;
}

.sc-setup {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px var(--s3);
  margin-bottom: var(--s4);
}

.sc-setup-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.sc-setup-list li {
  padding: 3px 8px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--panel-2);
  font-size: 12.5px;
  white-space: nowrap;
}

.sc-setup-list .sc-id {
  margin-right: 4px;
  color: var(--ink-3);
}

.sc-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s2);
}

.sc-actions .btn.is-done {
  border-color: var(--line);
  background: var(--panel-2);
  color: var(--ink-2);
}

.sc-actions .btn[aria-disabled='true']:not(.is-done) {
  opacity: 0.55;
}

.sc-dirty {
  margin: var(--s3) 0 0;
  color: var(--warn);
  font-size: 12.5px;
}

.sc-explain {
  max-width: 72ch;
  margin-top: var(--s4);
  padding: var(--s3) var(--s4);
  border-left: 3px solid var(--ink);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: var(--panel-2);
}

.sc-explain p {
  margin: 4px 0 0;
  font-size: 14px;
  line-height: 1.55;
}

.sc-waiting {
  margin: var(--s4) 0 0;
  color: var(--ink-3);
  font-size: 13px;
}

/* Event log */

.log {
  min-height: 0;
}

.log-scroll {
  flex: 1 1 auto;
  min-height: 0;
  max-height: 30rem;
  overflow-y: auto;
  overscroll-behavior: contain;
  border-radius: 0 0 var(--r-lg) var(--r-lg);
  /* Scroll shadows: a soft edge appears only where more entries are hidden. */
  background:
    linear-gradient(var(--panel) 30%, transparent) center top / 100% 32px no-repeat local,
    linear-gradient(transparent, var(--panel) 70%) center bottom / 100% 32px no-repeat local,
    radial-gradient(farthest-side at 50% 0, var(--scroll-shadow), transparent) center top / 100% 10px no-repeat scroll,
    radial-gradient(farthest-side at 50% 100%, var(--scroll-shadow), transparent) center bottom / 100% 10px no-repeat
      scroll;
}

@media (min-width: 1100px) {
  .log-scroll {
    height: 0;
    max-height: none;
  }
}

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

.log-empty {
  padding: var(--s4);
}

.group {
  padding: var(--s3) var(--s4) 14px;
  border-bottom: 1px solid var(--line);
}

.group.is-latest {
  box-shadow: inset 3px 0 0 var(--ink);
}

.group-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--s2);
}

.group-title {
  margin: 0;
  font-size: 13.5px;
  font-weight: 650;
  line-height: 1.35;
}

.group-meta {
  flex: none;
  color: var(--ink-3);
  font-size: 12px;
}

.group-note {
  margin: 2px 0 0;
  color: var(--ink-3);
  font-size: 12px;
}

.events {
  display: flex;
  flex-direction: column;
  gap: 5px;
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
}

.event {
  display: grid;
  grid-template-columns: 4.6rem minmax(0, 1fr);
  gap: var(--s2);
  align-items: baseline;
  font-size: 13px;
  line-height: 1.45;
}

.event-text {
  min-width: 0;
  overflow-wrap: anywhere;
}

.event-text .num {
  font-size: 12.5px;
}

.tag {
  justify-self: start;
  padding: 3px 5px 2px;
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  color: var(--ink-2);
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 650;
  letter-spacing: 0.03em;
  line-height: 1.2;
  text-transform: uppercase;
  white-space: nowrap;
}

.tag-accepted {
  border-color: var(--line);
  color: var(--ink-3);
}

.tag-trade {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--panel);
}

.tag-booked.is-bid {
  background: var(--bid-bg);
  border-color: var(--bid);
  color: var(--bid);
}

.tag-booked.is-ask {
  background: var(--ask-bg);
  border-color: var(--ask);
  color: var(--ask);
}

.tag-canceled {
  border-color: var(--warn);
  color: var(--warn);
}

.tag-rejected {
  background: var(--danger);
  border-color: var(--danger);
  color: var(--on-danger);
}

.tag-modified {
  border-color: var(--info);
  color: var(--info);
}

.subcmd {
  margin-top: 10px;
}

.subcmd-title {
  margin: 0;
  color: var(--ink-2);
  font-size: 12.5px;
  font-weight: 600;
}

.subcmd .events {
  margin-top: 4px;
}

/* Stress test */

.stress-body {
  container-type: inline-size;
}

@container (min-width: 880px) {
  .stress-grid {
    display: grid;
    grid-template-columns: minmax(280px, 340px) minmax(0, 1fr);
    gap: var(--s7);
    align-items: start;
  }

  .stress-grid .stress-out {
    margin-top: 0;
  }
}

.stress-intro {
  margin: 0 0 var(--s4);
  color: var(--ink-2);
}

.stress-controls {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--s3);
  margin-bottom: var(--s4);
}

.field-seed {
  max-width: 10rem;
}

.stress-out {
  container-type: inline-size;
  margin-top: var(--s4);
}

.stress-placeholder p {
  margin: 0;
  color: var(--ink-2);
  font-size: 13px;
}

.ref-table {
  width: 100%;
  margin-top: var(--s3);
  border-collapse: collapse;
  font-size: 12.5px;
}

.ref-table th,
.ref-table td {
  padding: 6px 12px 6px 0;
  border-bottom: 1px solid var(--line);
  text-align: left;
  white-space: nowrap;
}

.ref-table thead th {
  color: var(--ink-3);
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 650;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.ref-table tbody th {
  color: var(--ink-2);
  font-weight: 600;
}

.ref-table tr > :last-child {
  padding-right: 0;
}

.stress-status {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: var(--s3) var(--s4);
  border: 1px dashed var(--line-strong);
  border-radius: var(--r-md);
  color: var(--ink-2);
  font-size: 13px;
}

.spinner {
  flex: none;
  width: 14px;
  height: 14px;
  border: 2px solid var(--line-strong);
  border-top-color: var(--ink);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.rate {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 2px 10px;
  margin: 0;
}

.rate-value {
  font-family: var(--font-ui);
  font-size: 40px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.03em;
  line-height: 1.05;
}

.rate-unit {
  color: var(--ink);
  font-size: 15px;
  font-weight: 600;
}

.rate-note {
  margin: 6px 0 0;
  color: var(--ink-3);
  font-size: 12.5px;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 var(--s4);
  margin: var(--s4) 0 0;
  border-top: 1px solid var(--line);
}

.metrics div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--s2);
  padding: 7px 0;
  border-bottom: 1px solid var(--line);
}

.metrics dt {
  color: var(--ink-2);
  font-size: 12.5px;
}

.metrics dd {
  margin: 0;
  font-size: 13px;
  font-weight: 600;
}

.digests {
  display: grid;
  gap: var(--s3);
  margin-top: var(--s4);
}

.digest-label {
  margin: 0 0 4px;
  color: var(--ink-2);
  font-size: 12px;
  font-weight: 650;
}

.digest-row {
  display: grid;
  grid-template-columns: 7rem auto minmax(0, 1fr);
  align-items: baseline;
  gap: var(--s2);
  padding: 3px 0;
}

.digest-src {
  color: var(--ink-3);
  font-size: 12px;
}

.digest-hex {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.03em;
}

.digest-mark {
  color: var(--ok);
  font-size: 12px;
  font-weight: 650;
}

.digest-mark.is-bad {
  color: var(--danger);
}

.verdict {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: var(--s4) 0 0;
  padding: 10px var(--s3);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  font-size: 13.5px;
  font-weight: 650;
}

.verdict.is-match {
  border-color: var(--ok);
  background: var(--ok-bg);
  color: var(--ok);
}

.verdict.is-mismatch {
  border-color: var(--danger);
  background: var(--danger-bg);
  color: var(--danger);
}

.verdict.is-none {
  color: var(--ink-2);
  font-weight: 500;
}

.verdict .icon {
  width: 16px;
  height: 16px;
  stroke-width: 2;
}

.why {
  margin: var(--s3) 0 0;
  color: var(--ink-2);
  font-size: 12.5px;
  line-height: 1.5;
}

/* Wide result: throughput beside the metrics, the two digests side by side. */
@container (min-width: 600px) {
  .stress-result {
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: var(--s5) var(--s6);
    align-items: start;
  }

  .stress-result .metrics {
    margin-top: 0;
  }

  .stress-result .digests {
    grid-column: 1 / -1;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--s6);
    margin-top: 0;
    padding-top: var(--s4);
    border-top: 1px solid var(--line);
  }

  .stress-result .verdict-row {
    display: flex;
    grid-column: 1 / -1;
    align-items: center;
    gap: var(--s4);
  }

  .verdict-row .verdict {
    flex: none;
    margin: 0;
  }

  .verdict-row .why {
    margin: 0;
  }
}

.stress-error {
  margin: 0;
  padding: var(--s3) var(--s4);
  border: 1px solid var(--danger);
  border-radius: var(--r-md);
  background: var(--danger-bg);
  color: var(--danger);
  font-size: 13px;
}

/* Footer */

.site-footer {
  border-top: 1px solid var(--line);
}

.site-footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 6px var(--s6);
  max-width: 1480px;
  margin: 0 auto;
  padding: var(--s4) var(--s6) var(--s7);
  color: var(--ink-3);
  font-size: 12.5px;
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  color: var(--ink-2);
}

.noscript {
  max-width: 1480px;
  margin: 0 auto;
  padding: var(--s4) var(--s6) 0;
  color: var(--danger);
  font-weight: 600;
}

/* A narrow book (phones, or the middle column near 1100px) gets compact columns. */

.book {
  container-type: inline-size;
}

@container (max-width: 520px) {
  .ladder {
    --c-side: 2.35rem;
    --c-price: 3.5rem;
    --c-qty: 3.6rem;
    --c-gap: 8px;
  }

  .ladder-cols {
    padding-inline: 14px;
  }

  .level {
    padding: 1px 10px;
  }

  .level-price {
    font-size: 14px;
  }
}

/* Tablet and phone: the ladder shows only real levels. */

@media (max-width: 1099px) {
  :root {
    --ctl: 44px;
    --ctl-inner: 38px;
  }

  .ladder {
    --row-h: 42px;
  }

  .slot {
    display: none;
  }

  .chip {
    height: 32px;
    padding: 0 9px;
  }

  .level-btn {
    height: calc(var(--row-h) - 4px);
  }

  .btn-small {
    min-height: 36px;
  }

  .scenario-list button {
    min-height: 44px;
  }
}

@media (max-width: 640px) {
  .site-header-inner {
    padding: var(--s4);
  }

  .wordmark {
    font-size: 20px;
  }

  .tagline {
    font-size: 14px;
  }

  .header-links a {
    min-height: 40px;
  }

  .workspace {
    padding: var(--s3) var(--s4) var(--s5);
    gap: var(--s3);
  }

  .panel-body {
    padding: 14px;
  }

  .ticket-grid {
    gap: 14px 10px;
  }

  .seg button {
    font-size: 13px;
  }

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

  .scenario-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .scenario-list button {
    padding: 8px 10px;
    font-size: 13px;
  }

  .scenario-detail {
    padding: var(--s4) 14px var(--s5);
  }

  .sc-rule {
    font-size: 17px;
  }

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

  .digest-row {
    grid-template-columns: 6.5rem auto minmax(0, 1fr);
  }

  .site-footer-inner {
    padding: var(--s4) var(--s4) var(--s6);
  }
}

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

  /* Keep the "touched by the last command" marker, without motion. */
  .chip.is-touched {
    border-color: var(--hl);
    box-shadow: 0 0 0 1px var(--hl);
  }

  .chip[aria-pressed='true'].is-touched {
    box-shadow: 0 0 0 2px var(--hl);
  }

  .spinner {
    border-color: var(--ink-3);
  }
}