/* Warden demo styles: the guard's ledger. Paper, ink, one red for denials, one green for approvals.

   Light only on purpose. The page imitates a printed ledger, and a dark ledger stops reading as paper. */

:root {
  color-scheme: light;

  --paper: #f3f2ee;
  --paper-raised: #fafaf7;
  --paper-sunk: #e8e6df;
  --ink: #17191b;
  --ink-2: #4b4f53;
  --ink-3: #6b6f73;
  --rule: #cfccc3;
  --rule-strong: #a9a59b;
  --deny: #a8261d;
  --deny-wash: #f4e1dd;
  --approve: #1e5a3e;
  --approve-wash: #dfeae3;
  --focus: #17191b;

  --font-display: "Newsreader", "Iowan Old Style", Georgia, serif;
  --font-text: "IBM Plex Sans", "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, Consolas, monospace;

  --s1: 0.25rem;
  --s2: 0.5rem;
  --s3: 0.75rem;
  --s4: 1rem;
  --s5: 1.5rem;
  --s6: 2rem;
  --s7: 3rem;
  --s8: 4.5rem;
  --s9: 6.5rem;

  --radius: 2px;
  --gutter: max(16px, 4vw);

  /* Exponential ease-out for UI. The spring curve is a critically damped spring sampled into linear(). */
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --spring: linear(0, 0.1097, 0.3101, 0.5029, 0.6575, 0.771, 0.8503, 0.9037, 0.9389, 0.9616, 0.9761, 0.9852, 0.9909, 0.9945, 0.9966, 0.998, 1);

  --shadow-lift: 0 1px 1px rgba(23, 25, 27, 0.06), 0 4px 12px rgba(23, 25, 27, 0.08);
}

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1rem/1.55 var(--font-text);
  font-kerning: normal;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: var(--ink); color: var(--paper); }

a {
  color: inherit;
  text-decoration-line: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  text-decoration-color: var(--rule-strong);
  transition: text-decoration-color 160ms ease;
}
@media (hover: hover) and (pointer: fine) {
  a:hover { text-decoration-color: currentColor; }
}

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  border-radius: var(--radius);
}

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

.skip {
  position: absolute; left: var(--gutter); top: var(--s2);
  padding: var(--s2) var(--s3); background: var(--ink); color: var(--paper);
  transform: translateY(-160%); transition: transform 200ms var(--ease-out);
  z-index: 2;
}
.skip:focus { transform: translateY(0); }

.wrap {
  width: 100%;
  max-width: 74rem;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ----------------------------------------------------------------- masthead */

.mast { padding-top: var(--s6); }

/* A heavy rule over a hairline, the way ledgers and old newspapers open a page. */
.mast__rule {
  height: 5px;
  border-top: 3px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.mast__grid {
  display: grid;
  gap: var(--s6);
  padding-block: var(--s7) var(--s8);
}

.mast h1 {
  margin: 0;
  font-family: var(--font-display);
  font-optical-sizing: auto;
  font-weight: 500;
  font-size: clamp(3.75rem, 11vw, 6rem);
  line-height: 0.92;
  letter-spacing: -0.03em;
}

.mast__lede {
  margin: var(--s5) 0 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-optical-sizing: auto;
  font-weight: 400;
  font-size: clamp(1.5rem, 3.4vw, 2.25rem);
  line-height: 1.15;
  letter-spacing: -0.015em;
  text-wrap: balance;
}

.mast__body {
  margin: var(--s4) 0 0;
  max-width: 58ch;
  color: var(--ink-2);
  font-size: 1.0625rem;
  text-wrap: pretty;
}

.mast__note {
  align-self: end;
  border-top: 1px solid var(--ink);
  padding-top: var(--s3);
  font-size: 0.9375rem;
  color: var(--ink-2);
}
.mast__note p { margin: 0 0 var(--s3); max-width: 40ch; }
.mast__note dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--s1) var(--s4);
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}
.mast__note dt { color: var(--ink-3); }
.mast__note dd { margin: 0; color: var(--ink); overflow-wrap: anywhere; }

@media (min-width: 880px) {
  .mast__grid { grid-template-columns: minmax(0, 7fr) minmax(0, 4fr); gap: var(--s8); }
}

/* ----------------------------------------------------------------- sections */

.section { padding-bottom: var(--s9); }

.section__head {
  border-top: 1px solid var(--ink);
  padding-top: var(--s4);
  margin-bottom: var(--s5);
}

.section h2 {
  margin: 0;
  scroll-margin-top: var(--s5);
  font-family: var(--font-display);
  font-optical-sizing: auto;
  font-weight: 400;
  font-size: clamp(1.875rem, 4vw, 2.625rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.section__lede {
  margin: var(--s2) 0 0;
  max-width: 62ch;
  color: var(--ink-2);
  text-wrap: pretty;
}

/* ----------------------------------------------------------------- buttons */

.runs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--s3);
}
@media (max-width: 479px) {
  .runs { grid-template-columns: minmax(0, 1fr); }
}
@media (min-width: 880px) {
  .runs { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.btn {
  position: relative;
  display: grid;
  gap: 2px;
  align-content: start;
  min-height: 3rem;
  padding: var(--s3) var(--s4) calc(var(--s3) + 2px);
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  background: var(--paper-raised);
  color: var(--ink);
  font: 500 1rem/1.3 var(--font-text);
  text-align: left;
  cursor: pointer;
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  transition:
    background-color 160ms ease,
    color 160ms ease,
    border-color 160ms ease,
    box-shadow 200ms var(--ease-out),
    transform 160ms var(--ease-out);
}
.btn__note {
  font: 400 0.8125rem/1.35 var(--font-mono);
  color: var(--ink-3);
  transition: color 160ms ease;
}
.btn--deny { border-color: var(--deny); color: var(--deny); }
.btn--deny .btn__note { color: var(--deny); opacity: 0.8; }

@media (hover: hover) and (pointer: fine) {
  .btn:not(:disabled):hover { box-shadow: var(--shadow-lift); transform: translateY(-1px); }
  .btn:not(:disabled):not([aria-pressed="true"]):hover { background: var(--paper); }
}
.btn:not(:disabled):active { transform: scale(0.98); box-shadow: none; transition-duration: 90ms; }

.btn[aria-pressed="true"] { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn[aria-pressed="true"] .btn__note { color: var(--paper-sunk); opacity: 1; }
.btn--deny[aria-pressed="true"] { background: var(--deny); border-color: var(--deny); }

.btn:disabled { cursor: not-allowed; opacity: 0.42; }

/* Loading: a hairline along the bottom edge fills while the replay streams. JS sets the scale. */
.btn__progress {
  position: absolute; left: 0; right: 0; bottom: 0; height: 3px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left center;
  opacity: 0;
  transition: opacity 200ms ease;
}
.btn[aria-busy="true"] .btn__progress { opacity: 0.55; }

.btn--small {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  padding: var(--s2) var(--s4);
  font-size: 0.9375rem;
}

/* ----------------------------------------------------------------- select */

.field { display: grid; gap: var(--s2); margin-top: var(--s5); max-width: 40rem; }
.field label { font-size: 0.875rem; color: var(--ink-2); }

.select {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  min-height: 2.75rem;
  padding: var(--s2) 2.5rem var(--s2) var(--s3);
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius);
  background-color: var(--paper-raised);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1.5l5 5 5-5' fill='none' stroke='%2317191b' stroke-width='1.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.9rem center;
  color: var(--ink);
  font: 400 0.9375rem/1.3 var(--font-text);
  text-overflow: ellipsis;
  cursor: pointer;
  transition: border-color 160ms ease;
}
@media (hover: hover) and (pointer: fine) {
  .select:hover { border-color: var(--ink); }
}

/* ----------------------------------------------------------------- the stage */

.stage {
  margin-top: var(--s5);
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius);
  background: var(--paper-raised);
  min-height: 24rem;
}

.stage__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--s2) var(--s4);
  padding: var(--s4) var(--s5);
  border-bottom: 1px solid var(--rule-strong);
}
.stage__head h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.375rem;
  line-height: 1.2;
  letter-spacing: -0.01em;
  text-wrap: balance;
}
.stage__meta { font: 400 0.8125rem/1.4 var(--font-mono); color: var(--ink-3); }

.stage__body { padding: var(--s4) var(--s5) var(--s5); }

.stage__empty {
  display: grid;
  place-content: center;
  min-height: 24rem;
  padding: var(--s6) var(--s5);
  text-align: center;
  color: var(--ink-2);
}
.stage__empty strong {
  display: block;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.5rem;
  color: var(--ink);
  margin-bottom: var(--s2);
}
.stage__empty p { margin: 0 auto; max-width: 46ch; }

/* The tape: ruled like ledger paper, one recorded call per line. */
.tape {
  list-style: none;
  margin: 0;
  padding: 0;
  font: 400 0.8125rem/1.45 var(--font-mono);
}
.tape li {
  display: grid;
  grid-template-columns: 2ch 5.5rem minmax(0, 1fr);
  gap: var(--s3);
  align-items: baseline;
  padding-block: 0.4rem;
  border-bottom: 1px solid var(--rule);
}
.tape__n { color: var(--ink-3); text-align: right; font-variant-numeric: tabular-nums; }
.tape__who { color: var(--ink-3); }
.tape__text { overflow-wrap: anywhere; }
.tape li[data-kind="steered"] .tape__who { color: var(--deny); }
.tape li[data-kind="audit"] .tape__who { color: var(--ink); font-weight: 500; }
.tape .is-no { color: var(--deny); font-weight: 500; }
.tape .is-ok { color: var(--approve); font-weight: 500; }

/* The caret only exists while a line is printing, so it never loops for attention. */
.tape__caret {
  display: inline-block;
  width: 0.55em;
  height: 1.05em;
  margin-left: 1px;
  vertical-align: -0.15em;
  background: var(--ink);
}

@media (max-width: 560px) {
  .tape li { grid-template-columns: 2ch minmax(0, 1fr); row-gap: 0; }
  .tape__n { grid-row: span 2; }
  .tape__who { grid-column: 2; font-size: 0.75rem; }
  .tape__text { grid-column: 2; }
}

.planted {
  margin: 0 0 var(--s4);
  border: 1px solid var(--deny);
  border-radius: var(--radius);
  background: var(--deny-wash);
}
.planted__label {
  display: block;
  padding: var(--s2) var(--s3) 0;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--deny);
}
.planted__text {
  margin: 0;
  padding: var(--s1) var(--s3) var(--s3);
  max-height: 11rem;
  overflow: auto;
  font: 400 0.8125rem/1.5 var(--font-mono);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.goal { margin: 0 0 var(--s3); color: var(--ink-2); font-size: 0.9375rem; }

/* The verdict lands like a stamp: it scales down onto the page, never up from nothing. */
.verdict {
  margin-top: var(--s5);
  padding: var(--s4) var(--s5);
  border: 2px solid var(--approve);
  border-radius: var(--radius);
  background: var(--approve-wash);
  color: var(--approve);
  transform-origin: 20% 50%;
  animation: stamp 420ms var(--spring) both;
}
.verdict--deny { border-color: var(--deny); background: var(--deny-wash); color: var(--deny); }
.verdict strong {
  display: block;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.375rem, 3vw, 1.75rem);
  line-height: 1.15;
  letter-spacing: -0.015em;
}
.verdict p { margin: var(--s2) 0 0; color: var(--ink); max-width: 70ch; }
.verdict .verdict__aside { color: var(--ink-2); font-size: 0.9375rem; }
.num { font-variant-numeric: tabular-nums lining-nums; }

@keyframes stamp {
  from { opacity: 0; transform: scale(1.06); }
  to { opacity: 1; transform: none; }
}

/* ----------------------------------------------------------------- the chain */

.chain-scroll {
  overflow-x: auto;
  margin-inline: calc(var(--s5) * -1);
  padding-inline: var(--s5);
  scrollbar-width: thin;
  scrollbar-color: var(--rule-strong) transparent;
}

.chain {
  width: 100%;
  min-width: 34rem;
  border-collapse: collapse;
  font: 400 0.8125rem/1.4 var(--font-mono);
}
.chain th {
  text-align: left;
  font: 500 0.75rem/1.3 var(--font-text);
  color: var(--ink-3);
  padding: 0 var(--s2) var(--s2);
  border-bottom: 1px solid var(--ink);
}
.chain td {
  padding: 0 var(--s2);
  height: 2.6rem;
  border-bottom: 1px solid var(--rule);
  white-space: nowrap;
  transition: color 220ms ease, background-color 220ms ease;
}
.chain td:first-child, .chain th:first-child { width: 2rem; padding: 0; }
.chain .c-seq { width: 3ch; padding-left: var(--s2); color: var(--ink-3); font-variant-numeric: tabular-nums; }
.chain .c-check { white-space: nowrap; }
.chain .c-hash s { color: var(--ink-3); text-decoration-thickness: 1px; }
.chain .c-hash .got { color: var(--deny); font-weight: 500; }

/* The link column: a vertical line through a node on every row, which is the chain itself. */
.link { position: relative; }
.link::before {
  content: "";
  position: absolute;
  left: 50%; top: 0; bottom: -1px;
  width: 2px;
  margin-left: -1px;
  background: var(--ink);
  transition: background-color 220ms ease, opacity 220ms ease;
}
.link::after {
  content: "";
  position: absolute;
  left: 50%; top: 50%;
  width: 9px; height: 9px;
  margin: -4.5px 0 0 -4.5px;
  border-radius: 50%;
  background: var(--paper-raised);
  border: 2px solid var(--ink);
  transition: background-color 220ms ease, border-color 220ms ease, transform 300ms var(--spring);
}
tr:first-child .link::before { top: 50%; }
tr:last-child .link::before { bottom: 50%; }

tr[data-state="pending"] .c-check { color: var(--ink-3); }
tr[data-state="ok"] .link::after { background: var(--approve); border-color: var(--approve); }
tr[data-state="ok"] .c-check { color: var(--approve); }

tr[data-state="edited"] td { color: var(--deny); background: var(--deny-wash); }
tr[data-state="edited"] .link { background: transparent; }
tr[data-state="edited"] .link::before { background: transparent; }
tr[data-state="edited"] .link::after { background: var(--deny); border-color: var(--deny); transform: scale(1.35); }

tr[data-state="broken"] td { color: var(--deny); }
tr[data-state="broken"] .link::before {
  background: repeating-linear-gradient(to bottom, var(--deny) 0 4px, transparent 4px 8px);
}
tr[data-state="broken"] .link::after { border-color: var(--deny); background: var(--paper-raised); }

.chain-status { margin: var(--s4) 0 0; text-wrap: pretty; }
.chain-status__count {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.75rem;
  line-height: 1;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums lining-nums;
}
.chain-status__text { font-weight: 500; }
.chain-status[data-ok="true"] { color: var(--approve); }
.chain-status[data-ok="false"] { color: var(--deny); }

.tamper-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: var(--s3);
  margin-top: var(--s5);
  padding-top: var(--s4);
  border-top: 1px solid var(--rule);
}
.tamper-controls .field { margin: 0; flex: 1 1 18rem; }
.hint { margin: var(--s3) 0 0; font-size: 0.875rem; color: var(--ink-2); max-width: 70ch; }

/* ----------------------------------------------------------------- totals */

.totals { margin: 0; padding: 0; list-style: none; max-width: 52rem; }
.totals li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: var(--s4);
  padding-block: var(--s3);
  border-bottom: 1px solid var(--rule);
}
.totals li:last-child { border-bottom: 3px double var(--ink); }
.totals__label { color: var(--ink); text-wrap: pretty; }
.totals__label small { display: block; margin-top: 2px; color: var(--ink-3); font-size: 0.875rem; }
.totals__value {
  font-family: var(--font-display);
  font-optical-sizing: auto;
  font-weight: 500;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums lining-nums;
  text-align: right;
  white-space: nowrap;
}
.totals__value small {
  font-family: var(--font-text);
  font-size: 0.875rem;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--ink-3);
  margin-left: 0.35em;
}
.totals__value.is-zero { color: var(--approve); }
.source { margin: var(--s4) 0 0; font-size: 0.875rem; color: var(--ink-2); max-width: 70ch; }

/* ----------------------------------------------------------------- footer */

.foot {
  border-top: 1px solid var(--ink);
  padding-block: var(--s5) var(--s7);
  font-size: 0.875rem;
  color: var(--ink-2);
}
.foot p { margin: 0 0 var(--s2); max-width: 70ch; }

/* ----------------------------------------------------------------- reduced motion */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .verdict { animation: fade 200ms ease both; }
  .btn, .btn:not(:disabled):active, .btn:not(:disabled):hover { transform: none; }
  .link::after { transition: background-color 200ms ease, border-color 200ms ease; }
  tr[data-state="edited"] .link::after { transform: none; }
}
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }