/* Issue Pool — "exam paper" theme
   Warm booklet stock, transitional serif for the prompts, mono for anything
   the eye should treat as an instrument reading: labels, counts, clocks. */

:root {
  --serif: "Newsreader", "Iowan Old Style", Georgia, "Times New Roman", serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* light: undyed lokta stock */
  --paper: #ebe1cb;
  --stock: #f4eddc;
  --ink: #1b1710;
  --ink-soft: #514935;
  --ink-faint: #8d8266;
  --rule: #d2c5a5;
  --rule-soft: #e0d5bb;
  --mark: #a8382a;
  --mark-2: #2f5d78;
  --hit: #4c6a30;
  --drop: #1b171014;

  --grain: 0.5; /* strength of the handmade stock texture */
  --paper-layers:
    /* bark flecks caught in the pulp */
      url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 900 900'%3E%3Cg fill='%238a7040' opacity='0.4'%3E%3Cellipse cx='88' cy='146' rx='6' ry='0.8' transform='rotate(24 88 146)'/%3E%3Cellipse cx='333' cy='62' rx='4' ry='0.7' transform='rotate(-38 333 62)'/%3E%3Cellipse cx='602' cy='198' rx='7' ry='0.8' transform='rotate(9 602 198)'/%3E%3Cellipse cx='781' cy='353' rx='5' ry='0.7' transform='rotate(-14 781 353)'/%3E%3Cellipse cx='146' cy='498' rx='8' ry='0.8' transform='rotate(-62 146 498)'/%3E%3Cellipse cx='438' cy='416' rx='4' ry='0.7' transform='rotate(48 438 416)'/%3E%3Cellipse cx='266' cy='679' rx='6' ry='0.8' transform='rotate(15 266 679)'/%3E%3Cellipse cx='677' cy='602' rx='7' ry='0.7' transform='rotate(-27 677 602)'/%3E%3Cellipse cx='536' cy='803' rx='4' ry='0.8' transform='rotate(71 536 803)'/%3E%3Cellipse cx='825' cy='736' rx='6' ry='0.7' transform='rotate(33 825 736)'/%3E%3Cellipse cx='42' cy='301' rx='4' ry='0.7' transform='rotate(-8 42 301)'/%3E%3C/g%3E%3C/svg%3E"),
    /* long fibres */
      url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 900 900'%3E%3Cfilter id='h'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.004 0.42' numOctaves='1' seed='11' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23h)' opacity='0.35'/%3E%3C/svg%3E"),
    /* a few pulled the other way */
      url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 760 760'%3E%3Cfilter id='v'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.38 0.003' numOctaves='1' seed='4' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23v)' opacity='0.2'/%3E%3C/svg%3E"),
    /* uneven pulp density */
      url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1100 1100'%3E%3Cfilter id='p'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.009' numOctaves='3' seed='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23p)' opacity='0.4'/%3E%3C/svg%3E"),
    /* tooth */
      url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 256 256'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.07'/%3E%3C/svg%3E");
  --paper-sizes: 900px 900px, 900px 900px, 760px 760px, 1100px 1100px, 200px 200px;
  --blend: multiply;
  --vignette: #6b552c14;
  --card: color-mix(in srgb, var(--stock) 86%, transparent);

  color-scheme: light dark;
}

/* dark stock — applied when the OS asks for it and the reader hasn't chosen light */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #14130f;
    --stock: #1b1a15;
    --ink: #ece7da;
    --ink-soft: #b3ac9c;
    --ink-faint: #7d7768;
    --rule: #38342b;
    --rule-soft: #2a2721;
    --mark: #d1725f;
    --mark-2: #7fa8c4;
    --hit: #9bbd77;
    --drop: #00000059;

    --grain: 0.28;
    --blend: screen;
    --vignette: transparent;
    --card: var(--stock);
    --paper-layers: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 256 256'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.07'/%3E%3C/svg%3E");
    --paper-sizes: 200px 200px;
  }
}

/* …and when they pick it outright */
:root[data-theme="dark"] {
  --paper: #14130f;
  --stock: #1b1a15;
  --ink: #ece7da;
  --ink-soft: #b3ac9c;
  --ink-faint: #7d7768;
  --rule: #38342b;
  --rule-soft: #2a2721;
  --mark: #d1725f;
  --mark-2: #7fa8c4;
  --hit: #9bbd77;
  --drop: #00000059;

  --grain: 0.28;
  --blend: screen;
  --vignette: transparent;
  --card: var(--stock);
  --paper-layers: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 256 256'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.07'/%3E%3C/svg%3E");
  --paper-sizes: 200px 200px;
}

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

html,
body {
  min-height: 100%;
  margin: 0;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  position: relative;
}

/* Handmade lokta stock: uneven pulp, fibres pulled both ways across the frame,
   bark flecks caught in the sheet, and a fine tooth over the whole thing. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1; /* strictly behind the sheet — never tints type or buttons */
  pointer-events: none;
  mix-blend-mode: var(--blend);
  background-image: var(--paper-layers);
  background-size: var(--paper-sizes);
  opacity: var(--grain);
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: radial-gradient(125% 95% at 50% 38%, transparent 55%, var(--vignette));
}

/* booklet margin */
.margin-rule {
  position: fixed;
  top: 0;
  bottom: 0;
  left: max(2.25rem, 4.5vw);
  width: 1px;
  background: var(--mark);
  opacity: 0.22;
  z-index: 0;
}
@media (max-width: 900px) {
  .margin-rule {
    display: none;
  }
}

.sheet {
  position: relative;
  z-index: 1;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  width: min(860px, 100%);
  margin: 0 auto;
  padding: 0 clamp(1rem, 4vw, 2.5rem) 2rem;
}

/* ---------------------------------------------------------------- top bar */
.topbar {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 1.35rem 0 0.75rem;
  border-bottom: 1px solid var(--ink);
}
.wordmark {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}
.topbar-meta {
  margin: 0 0 0 auto;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
}
.settings {
  align-self: center;
}
.theme-btn {
  align-self: center;
  min-width: 4.1rem;
  height: 1.9rem;
  padding: 0 0.5rem;
  cursor: pointer;
  color: var(--ink-soft);
  background: none;
  border: 1px solid var(--rule);
  border-radius: 0;
  font-family: var(--mono);
  font-size: 0.63rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.theme-btn:hover {
  color: var(--ink);
  border-color: var(--ink);
  background: var(--stock);
}
.theme-btn:focus-visible,
.icon-btn:focus-visible {
  outline: 2px solid var(--mark);
  outline-offset: 2px;
}
.icon-btn {
  display: grid;
  place-items: center;
  width: 1.9rem;
  height: 1.9rem;
  padding: 0;
  cursor: pointer;
  color: var(--ink-soft);
  background: none;
  border: 1px solid var(--rule);
  border-radius: 0;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.icon-btn:not(:disabled):hover {
  color: var(--ink);
  border-color: var(--ink);
  background: var(--stock);
}
.icon-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}
.icon-btn svg {
  width: 1rem;
  height: 1rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5px;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ----------------------------------------------------------------- stage */
.stage {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: clamp(1.35rem, 3.5vh, 2rem);
  padding-top: clamp(1.5rem, 5vh, 2.75rem);
}
.stage-body {
  display: flex;
  flex-direction: column;
  gap: clamp(1.35rem, 3.5vh, 2rem);
}
.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem 1rem;
}
.mode-blurb {
  flex: 1 1 18rem;
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
  font-style: italic;
  line-height: 1.5;
  max-width: 46ch;
}
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  width: 100%;
}

/* ------------------------------------------------------------------ tabs */
.tabs {
  display: flex;
  border: 1.5px solid var(--ink);
}
.tab {
  appearance: none;
  cursor: pointer;
  padding: 0.6rem 1rem;
  color: var(--ink);
  background: none;
  border: none;
  border-radius: 0;
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  transition: background 0.15s, color 0.15s;
}
.tab + .tab {
  border-left: 1.5px solid var(--ink);
}
.tab:not(:disabled):hover {
  background: var(--rule-soft);
}
.tab.is-active {
  background: var(--ink);
  color: var(--paper);
}
.tabs.is-disabled {
  opacity: 0.45;
}
.tab:disabled {
  cursor: not-allowed;
}

/* --------------------------------------------------------------- selects */
.select {
  position: relative;
  flex: 1 1 15rem;
  min-width: 0;
}
.select-trigger {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  width: 100%;
  cursor: pointer;
  padding: 0.55rem 0.7rem;
  color: var(--ink);
  background: var(--stock);
  border: 1px solid var(--rule);
  border-radius: 0;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.02em;
  transition: border-color 0.15s, background 0.15s;
}
.select-trigger:not(:disabled):hover,
.select.is-open .select-trigger {
  border-color: var(--ink);
}
.select-trigger:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}
.select-label {
  flex: 1;
  text-align: left;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.select-count {
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
  font-size: 0.7rem;
}
.select-caret {
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid var(--ink-faint);
  transition: transform 0.15s;
}
.select.is-open .select-caret {
  transform: rotate(180deg);
}
.select-menu {
  position: absolute;
  top: calc(100% - 1px);
  left: 0;
  right: 0;
  z-index: 30;
  max-height: min(52vh, 380px);
  overflow-y: auto;
  padding: 0.25rem;
  background: var(--stock);
  border: 1px solid var(--ink);
  box-shadow: 6px 6px 0 var(--drop);
}
.select-option {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  width: 100%;
  cursor: pointer;
  padding: 0.45rem 0.55rem;
  color: var(--ink);
  text-align: left;
  background: none;
  border: none;
  border-radius: 0;
  font-family: var(--mono);
  font-size: 0.74rem;
}
.select-option:hover {
  background: var(--rule-soft);
}
.select-option.is-active {
  color: var(--paper);
  background: var(--ink);
}
.select-option.is-active .select-count {
  color: var(--rule);
}
.select-option[disabled] {
  opacity: 0.3;
  cursor: not-allowed;
}

/* ------------------------------------------------------------------ card */
.card {
  background: var(--card);
  border: 1px solid var(--ink);
  box-shadow: 7px 7px 0 var(--drop);
}
.card-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1rem;
  padding: 0.6rem 1.15rem;
  border-bottom: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.card-slug {
  color: var(--mark);
  font-weight: 600;
}
.card-tags {
  margin-left: auto;
  color: var(--ink-faint);
}
.card-body {
  padding: clamp(1.35rem, 4vw, 2.35rem) clamp(1.15rem, 4vw, 2.35rem);
  min-height: clamp(12rem, 30vh, 17rem);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.9rem;
}
.statement,
.claim,
.reason {
  margin: 0;
  font-weight: 300;
  line-height: 1.28;
  letter-spacing: -0.005em;
  text-wrap: pretty;
  font-size: clamp(1.5rem, 3.5vw, 2.1rem);
}
.statement.len-m {
  font-size: clamp(1.3rem, 2.9vw, 1.75rem);
}
.statement.len-l {
  font-size: clamp(1.1rem, 2.3vw, 1.42rem);
  line-height: 1.4;
}
.claim {
  font-size: clamp(1.35rem, 3vw, 1.8rem);
}
.reason {
  font-size: clamp(1.1rem, 2.3vw, 1.4rem);
  color: var(--ink-soft);
  line-height: 1.4;
}
.claim::before,
.reason::before {
  content: attr(data-tag);
  display: block;
  margin-bottom: 0.3rem;
  font-family: var(--mono);
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mark);
}
.directions {
  margin: 0.35rem 0 0;
  padding-top: 0.95rem;
  border-top: 1px dashed var(--rule);
  color: var(--ink-soft);
  font-size: 0.98rem;
  font-style: italic;
  line-height: 1.6;
  max-width: 64ch;
}
.card.is-spinning .statement {
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
  color: var(--ink-faint);
}
.card.is-spinning .claim,
.card.is-spinning .reason {
  display: none;
}
.card.is-landed .card-body {
  animation: stamp 0.4s cubic-bezier(0.2, 0.8, 0.3, 1) both;
}

/* --------------------------------------------------------------- actions */
.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.15rem;
}
.actions-main {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}
.btn {
  appearance: none;
  cursor: pointer;
  padding: 0.8rem 1.3rem;
  color: var(--ink);
  background: var(--stock);
  border: 1.5px solid var(--ink);
  border-radius: 0;
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  transition: background 0.15s, color 0.15s, transform 0.1s, box-shadow 0.1s;
}
.btn:not(:disabled):hover {
  background: var(--ink);
  color: var(--paper);
}
.btn.primary {
  background: var(--ink);
  color: var(--paper);
  box-shadow: 4px 4px 0 var(--drop);
}
.btn.primary:not(:disabled):hover {
  background: var(--mark);
  border-color: var(--mark);
  color: var(--stock);
}
.btn:not(:disabled):active {
  transform: translate(2px, 2px);
  box-shadow: 0 0 0 var(--drop);
}
.btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}
.btn:focus-visible {
  outline: 2px solid var(--mark);
  outline-offset: 2px;
}
.btn.link {
  margin-left: auto;
  padding: 0.3rem 0;
  background: none;
  border: none;
  color: var(--ink-soft);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
  letter-spacing: 0.1em;
}
.btn.link:not(:disabled):hover {
  background: none;
  color: var(--mark);
}

.pool-meta {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
}

.foot {
  margin-top: auto;
  padding-top: 2.5rem;
}
.foot p {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  margin: 0;
  padding-top: 0.75rem;
  border-top: 1px solid var(--rule);
  color: var(--ink-faint);
  font-size: 0.82rem;
  font-style: italic;
}
.foot-keys {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 0.66rem;
  font-style: normal;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
kbd {
  font-family: var(--mono);
  font-size: 0.66rem;
  padding: 0.05rem 0.3rem;
  border: 1px solid var(--rule);
  color: var(--ink-soft);
}

/* --------------------------------------------------------------- overlays */
.overlay {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: center;
  padding: clamp(1rem, 4vw, 2rem);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  animation: fade-in 0.2s ease-out both;
}
.panel {
  width: min(430px, 100%);
  background: var(--stock);
  border: 1px solid var(--ink);
  box-shadow: 8px 8px 0 var(--drop);
  padding: 1.4rem 1.5rem 1.35rem;
  text-align: left;
}
.panel-title {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}
.panel-blurb {
  margin: 0.5rem 0 1.4rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--rule);
  color: var(--ink-soft);
  font-size: 0.95rem;
  font-style: italic;
}
.field + .field {
  margin-top: 1.4rem;
}
.field-head {
  display: flex;
  justify-content: baseline;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 0.6rem;
}
.field-label {
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.field-hint {
  margin-left: 0.5rem;
  color: var(--ink-faint);
  font-family: var(--serif);
  font-size: 0.82rem;
  font-style: italic;
  font-weight: 400;
  letter-spacing: 0;
  text-transform: none;
}
.field-value {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 0.95rem;
  font-variant-numeric: tabular-nums;
}
.slider {
  appearance: none;
  width: 100%;
  height: 1px;
  margin: 0.5rem 0;
  background: var(--ink);
  cursor: pointer;
  border-radius: 0;
}
.slider::-webkit-slider-thumb {
  appearance: none;
  width: 0.7rem;
  height: 1.15rem;
  background: var(--ink);
  border: none;
  border-radius: 0;
  cursor: pointer;
}
.slider::-moz-range-thumb {
  width: 0.7rem;
  height: 1.15rem;
  background: var(--ink);
  border: none;
  border-radius: 0;
  cursor: pointer;
}
.slider:focus-visible {
  outline: 2px solid var(--mark);
  outline-offset: 4px;
}
.field-ends {
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.check {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-top: 1.4rem;
  font-size: 0.95rem;
}
.check input {
  width: 0.95rem;
  height: 0.95rem;
  accent-color: var(--mark);
  cursor: pointer;
}
.check label {
  cursor: pointer;
}
.panel-note {
  margin: 1.3rem 0 0.5rem;
  padding-top: 0.8rem;
  border-top: 1px solid var(--rule);
  color: var(--ink-faint);
  font-size: 0.85rem;
  font-style: italic;
}
.panel-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 1rem;
}
.panel-actions .btn.primary {
  margin-left: auto;
}

/* ----------------------------------------------------------------- timer */
.timer-overlay {
  background: var(--paper);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  align-items: stretch;
}
.timer-sheet {
  width: min(760px, 100%);
  margin: auto;
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
  max-height: 100%;
  overflow-y: auto;
}
.t-slug {
  margin: 0;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--ink);
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mark);
}
.timer-overlay.is-research .t-slug {
  color: var(--mark-2);
}
.t-topic {
  margin: 0;
  max-width: 62ch;
  color: var(--ink-soft);
  font-size: clamp(0.95rem, 2vw, 1.1rem);
  font-style: italic;
  line-height: 1.5;
}
.t-clock {
  margin: 0.5rem 0 0;
  font-size: clamp(4rem, 17vw, 8.5rem);
  font-weight: 300;
  line-height: 0.9;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}
.timer-overlay.is-done .t-clock {
  color: var(--mark);
}
.t-bar {
  position: relative;
  height: 3px;
  background: var(--rule);
}
.t-fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0;
  background: var(--ink);
  transition: width 0.2s linear;
}
.timer-overlay.is-research .t-fill {
  background: var(--mark-2);
}
.t-arc {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.t-arc li {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  transition: color 0.3s;
}
.t-arc li::before {
  content: "";
  width: 0.45rem;
  height: 0.45rem;
  border: 1px solid currentColor;
  flex-shrink: 0;
  transition: background 0.3s;
}
.t-arc li.is-hit {
  color: var(--hit);
}
.t-arc li.is-hit::before {
  background: var(--hit);
}
.t-status {
  margin: 0;
  font-size: clamp(1.05rem, 2.4vw, 1.3rem);
  font-style: italic;
  color: var(--ink-soft);
}
.t-next {
  margin: -0.6rem 0 0;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.t-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.5rem;
  padding-top: 0.5rem;
}
.t-actions .btn.link {
  margin-left: 0;
}

/* ---------------------------------------------------------------- utility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  overflow: hidden;
  white-space: nowrap;
  clip-path: inset(50%);
}
[hidden] {
  display: none !important;
}
.is-inert {
  pointer-events: none;
  user-select: none;
}

@keyframes stamp {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}
@keyframes fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@media (max-width: 620px) {
  .t-arc {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .btn.link {
    margin-left: 0;
  }
  .foot-keys {
    margin-left: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}

/* ---------------------------------------------------------------- debrief */
.debrief-overlay {
  background: var(--paper);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  align-items: start;
  padding: 0;
  overflow-y: auto;
}
.debrief {
  width: min(880px, 100%);
  margin: 0 auto;
  padding: clamp(1.5rem, 5vh, 3rem) clamp(1rem, 4vw, 2.5rem) 4rem;
  outline: none;
}
.d-top {
  padding-bottom: 1.1rem;
  border-bottom: 1.5px solid var(--ink);
  margin-bottom: 2rem;
}
.d-prompt {
  margin: 0.9rem 0 0;
  font-size: clamp(1.15rem, 2.6vw, 1.5rem);
  font-weight: 300;
  line-height: 1.3;
  max-width: 46ch;
}
.d-prompt-task {
  margin: 0.75rem 0 0;
  max-width: 62ch;
  color: var(--ink-faint);
  font-size: 0.88rem;
  font-style: italic;
  line-height: 1.55;
}
.d-section {
  margin-bottom: 2.35rem;
}
.d-head {
  margin: 0 0 0.5rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mark);
}
.d-kicker {
  margin: 0 0 0.85rem;
  line-height: 1.55;
  color: var(--ink-faint);
  font-size: 0.86rem;
  font-style: italic;
  max-width: 66ch;
}
.d-body {
  margin: 0;
  max-width: 68ch;
  font-size: 1.02rem;
  line-height: 1.62;
}
.d-list {
  margin: 0;
  padding-left: 1.1rem;
  max-width: 68ch;
}
.d-list li {
  margin-bottom: 0.5rem;
  font-size: 0.98rem;
  line-height: 1.55;
}
.d-list li::marker {
  color: var(--ink-faint);
}
.d-traps li::marker {
  color: var(--mark);
}
.d-cols {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem 2rem;
}
.d-sub {
  margin: 0 0 0.6rem;
  font-family: var(--mono);
  font-size: 0.64rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.d-examples {
  margin: 0;
  max-width: 72ch;
}
.d-examples dt {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--ink);
  margin-top: 0.9rem;
}
.d-examples dd {
  margin: 0.25rem 0 0;
  font-size: 0.96rem;
  line-height: 1.55;
  color: var(--ink-soft);
}
.d-para {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 15rem;
  gap: 1.75rem;
  padding: 1.1rem 0;
  border-bottom: 1px dashed var(--rule);
}
.d-para-text {
  margin: 0;
  font-size: 1.06rem;
  line-height: 1.68;
}
.d-note {
  display: flex;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  line-height: 1.5;
  color: var(--ink-faint);
}
.d-note-n {
  flex-shrink: 0;
  width: 1.15rem;
  height: 1.15rem;
  display: grid;
  place-items: center;
  border: 1px solid var(--mark);
  color: var(--mark);
  font-size: 0.62rem;
}
.d-foot {
  margin-top: 2.5rem;
  padding-top: 1rem;
  border-top: 1.5px solid var(--ink);
}
.d-foot p {
  margin: 0 0 0.9rem;
  max-width: 68ch;
  color: var(--ink-faint);
  font-size: 0.85rem;
  font-style: italic;
  line-height: 1.6;
}
.d-link {
  display: inline-block;
  margin-bottom: 1.4rem;
  color: var(--mark);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
}
.d-close {
  display: block;
}

@media (max-width: 700px) {
  .d-cols {
    grid-template-columns: minmax(0, 1fr);
  }
  .d-para {
    grid-template-columns: minmax(0, 1fr);
    gap: 0.85rem;
  }
  .d-note {
    padding-left: 0.75rem;
    border-left: 2px solid var(--rule);
  }
}