/* ============================================================
   STUDY HARNESS — STRIP BAY
   An air-traffic flight-progress strip bay for the study plan.
   Board ground + manila paper strips + one signal-red device.
   ============================================================ */

:root {
  /* Board (control-room ground) */
  --board: #12151a;
  --board-2: #171b21;
  --board-3: #1d222a;
  --rule: #262b33;
  --rule-strong: #394150;
  --board-text: #e8e5de;
  --board-muted: #afb8c2;
  --board-faint: #8b95a1;

  /* Paper */
  --paper: #ece5d6;
  --paper-shade: #e1d8c4;
  --paper-edge: #c6bca6;
  --ink: #211f1a;
  --ink-soft: #565247;
  --ink-faint: #6c6659;

  /* Status ink stamped on paper */
  --stamp-done: #26603f;
  --stamp-progress: #8a5c12;
  --stamp-planned: #5b636d;

  /* The single signal, reserved for the strip pulled forward */
  --signal: #dc4a41;
  --signal-deep: #a62d26;

  /* Interaction focus — deliberately NOT the reserved signal */
  --focus: #8fb8d8;
  /* Discoverability / due states — amber, not the reserved signal */
  --notice: #e0a83c;

  /* Per-phase tabs — muted, the only other chroma on the board */
  --tab-p1: #c08a37;
  --tab-p2: #3d7ba6;
  --tab-p3: #4f8f63;
  --tab-p4: #7f5aa0;

  --sans: "Overpass", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "Overpass Mono", ui-monospace, "SFMono-Regular", Consolas, monospace;

  --step-0: 0.8125rem;
  --step-1: 0.9375rem;
  --step-2: 1.0625rem;
  --step-3: 1.25rem;
  --step-4: 1.5rem;
  --step-5: 2rem;
  --step-6: 2.75rem;
}

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

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

body {
  margin: 0;
  background: var(--board);
  color: var(--board-text);
  font-family: var(--sans);
  font-size: var(--step-1);
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

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

.skip-link {
  position: absolute;
  left: 12px;
  top: -48px;
  z-index: 40;
  padding: 8px 14px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--mono);
  font-size: var(--step-0);
  border-radius: 3px;
  transition: top 0.15s ease;
}
.skip-link:focus {
  top: 12px;
}

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

/* ---------- Board shell ---------- */

.board {
  max-width: 1360px;
  margin: 0 auto;
  padding: 18px 26px 72px;
}

/* ---------- Board bar ---------- */

.board-bar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: grid;
  grid-template-columns: auto minmax(200px, 1fr) auto;
  align-items: center;
  gap: 18px;
  padding: 12px 0 12px;
  background: var(--board);
  border-bottom: 1px solid var(--rule);
}

.board-id {
  display: flex;
  align-items: baseline;
  gap: 9px;
  white-space: nowrap;
}

.board-mark {
  font-family: var(--mono);
  font-weight: 600;
  font-size: var(--step-0);
  letter-spacing: 0.16em;
  color: var(--board-text);
}

.board-sub {
  font-size: var(--step-0);
  color: var(--board-faint);
  letter-spacing: 0.06em;
}

.board-route {
  font-family: var(--mono);
  font-size: var(--step-0);
  color: var(--board-muted);
  padding: 1px 7px;
  border: 1px solid var(--rule-strong);
  border-radius: 3px;
}

.board-search {
  position: relative;
  display: flex;
  align-items: center;
  justify-self: stretch;
  max-width: 520px;
  margin: 0 auto;
  width: 100%;
}

.search-slash {
  position: absolute;
  left: 12px;
  font-family: var(--mono);
  font-size: var(--step-0);
  color: var(--board-faint);
  pointer-events: none;
}

.board-search input {
  width: 100%;
  padding: 8px 34px 8px 26px;
  background: var(--board-2);
  border: 1px solid var(--rule-strong);
  border-radius: 4px;
  color: var(--board-text);
  font-size: var(--step-0);
  caret-color: var(--notice);
}
.board-search input::placeholder {
  color: var(--board-faint);
}
.board-search input:focus {
  border-color: var(--focus);
  outline: none;
}

.kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  font-size: 12px;
  color: var(--board-muted);
  background: var(--board-3);
  border: 1px solid var(--rule-strong);
  border-radius: 3px;
}

.board-search .kbd {
  position: absolute;
  right: 8px;
  pointer-events: none;
}

.board-actions {
  justify-self: end;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  background: var(--board-2);
  border: 1px solid var(--rule-strong);
  border-radius: 4px;
  color: var(--board-text);
  font-family: var(--sans);
  font-size: var(--step-0);
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}
.btn:hover {
  background: var(--board-3);
  border-color: var(--board-faint);
}
.btn:active {
  transform: translateY(1px);
}
.btn[disabled] {
  opacity: 0.55;
  cursor: progress;
}

/* ---------- T-minus band ---------- */

.tminus {
  margin: 22px 0 18px;
}

.tminus-band {
  display: flex;
  align-items: center;
  gap: 14px;
}

.tminus-cap {
  font-family: var(--mono);
  font-size: var(--step-0);
  letter-spacing: 0.1em;
  color: var(--board-muted);
}
.tminus-cap--end {
  color: var(--board-text);
}

.tminus-track {
  position: relative;
  flex: 1;
  height: 30px;
}

.tminus-fill {
  position: absolute;
  top: 14px;
  left: 0;
  height: 2px;
  width: 0;
  background: var(--board-text);
}

.tminus-today {
  position: absolute;
  top: 8px;
  left: 0;
  width: 2px;
  height: 14px;
  background: var(--board-text);
}

.tminus-ticks {
  position: absolute;
  top: 13px;
  left: 0;
  right: 0;
  height: 4px;
  border-top: 1px solid var(--rule);
  background-image: repeating-linear-gradient(
    to right,
    var(--rule-strong) 0,
    var(--rule-strong) 1px,
    transparent 1px,
    transparent calc(100% / 32)
  );
}

.tminus-readout {
  margin: 8px 0 0;
  font-family: var(--mono);
  font-size: var(--step-0);
  color: var(--board-muted);
}
.tminus-readout b {
  color: var(--board-text);
  font-weight: 600;
}
.tminus-readout .behind {
  color: var(--notice);
}
.tminus-readout .ahead {
  color: var(--stamp-done);
}

/* ---------- Meters ---------- */

.meters {
  display: flex;
  flex-wrap: wrap;
  gap: 0 26px;
  padding: 12px 0 14px;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.meter {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 3px 0;
}

.meter dt {
  font-size: var(--step-0);
  letter-spacing: 0.05em;
  color: var(--board-faint);
  text-transform: uppercase;
}

.meter dd {
  margin: 0;
  font-family: var(--mono);
  font-size: var(--step-1);
  font-weight: 600;
  color: var(--board-text);
}

.meter .unit {
  font-size: var(--step-0);
  color: var(--board-faint);
  font-weight: 400;
}

.meter--done dd {
  color: var(--stamp-done);
}
.meter--active dd {
  color: var(--stamp-progress);
}
.meter--notice dd {
  color: var(--notice);
}

/* ---------- Strip (paper) ---------- */

.strip {
  position: relative;
  background-color: var(--paper);
  color: var(--ink);
  border: 1px solid var(--paper-edge);
  border-radius: 3px;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.45) inset,
    0 12px 26px -16px rgba(0, 0, 0, 0.82);
}
/* Paper stock edge: a darker top edge and a soft under-edge, no pattern */
.strip::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border-top: 1px solid rgba(255, 255, 255, 0.55);
  border-bottom: 2px solid rgba(120, 104, 70, 0.22);
  pointer-events: none;
}

.strip--skeleton {
  height: 148px;
  background: linear-gradient(180deg, var(--board-2), var(--board-3));
  border-color: var(--rule);
  box-shadow: none;
  animation: breathe 1.4s ease-in-out infinite;
}

@keyframes breathe {
  0%,
  100% {
    opacity: 0.55;
  }
  50% {
    opacity: 0.28;
  }
}

/* The pulled-forward strip */
.active-slot {
  margin: 22px 0 30px;
}

.strip--active {
  padding: 0 0 18px;
  border-color: var(--signal-deep);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.45) inset,
    0 2px 0 var(--paper-edge), 0 26px 52px -24px rgba(0, 0, 0, 0.9);
  animation: slot-in 0.34s cubic-bezier(0.16, 1, 0.3, 1) both;
  transform: rotate(-0.8deg);
}

@keyframes slot-in {
  from {
    transform: translateY(12px) rotate(-1.4deg);
    opacity: 0;
  }
  to {
    transform: translateY(0) rotate(-0.8deg);
    opacity: 1;
  }
}

.strip--active .strip__top {
  padding: 14px 20px 12px;
}

/* Strip top row */
.strip__top {
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-areas: "tab head stamp";
  align-items: start;
  gap: 4px 16px;
  padding: 9px 14px;
}

.strip__tab {
  grid-area: tab;
  align-self: start;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  background: var(--tab, var(--board-muted));
  color: #14171b;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  border-radius: 2px;
  white-space: nowrap;
}

.strip--active .strip__tab {
  background: var(--signal);
  color: #fff;
}

.strip__head {
  grid-area: head;
  min-width: 0;
}

.strip__callsign {
  display: block;
  font-family: var(--mono);
  font-size: var(--step-2);
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.strip__title {
  margin: 1px 0 0;
  font-size: var(--step-1);
  font-weight: 400;
  color: var(--ink-soft);
  line-height: 1.35;
}

.strip--active .strip__callsign {
  font-size: var(--step-4);
}
.strip--active .strip__title {
  font-size: var(--step-2);
  color: var(--ink);
  max-width: 62ch;
}

/* Rubber stamp */
.stamp {
  grid-area: stamp;
  justify-self: end;
  padding: 3px 8px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  border: 2px solid currentColor;
  border-radius: 3px;
  transform: rotate(-2.5deg);
  white-space: nowrap;
}
.stamp--done {
  color: var(--stamp-done);
}
.stamp--in-progress {
  color: var(--stamp-progress);
}
.stamp--not-started {
  color: var(--stamp-planned);
  border-style: dashed;
}

/* Strip body */
.strip__body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}
.strip__body > .strip__inner {
  overflow: hidden;
  min-height: 0;
}

.strip.is-pulled .strip__body,
.strip--active .strip__body {
  grid-template-rows: 1fr;
}

.strip__inner {
  padding: 0 14px;
}
.strip--active .strip__inner {
  padding: 0 20px;
}

.strip__rule {
  height: 0;
  margin: 12px 0;
  border: 0;
  border-top: 1px dashed var(--paper-edge);
}

/* Next-check callout */
.next-check {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 10px 12px;
  background: var(--paper-shade);
  border: 1px dashed var(--paper-edge);
  border-radius: 3px;
}
.next-check__label {
  flex-shrink: 0;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--signal-deep);
}
.next-check__text {
  font-size: var(--step-2);
  font-weight: 600;
  color: var(--ink);
  line-height: 1.35;
}

/* Checklist */
.checklist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 7px;
}
.check {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 10px;
  align-items: baseline;
}
.check__box {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  border: 1.5px solid var(--paper-edge);
  border-radius: 2px;
  padding: 1px 0;
  text-align: center;
}
.check--go .check__box {
  color: var(--stamp-done);
  border-color: var(--stamp-done);
}
.check--next .check__box {
  color: var(--signal-deep);
  border-color: var(--signal);
  border-style: dashed;
}
.check--next .check__text {
  color: var(--ink);
  font-weight: 600;
}
.check__text {
  color: var(--ink-soft);
  line-height: 1.4;
}

/* Fields */
.fields {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px 22px;
}
.field {
  min-width: 0;
}
.field__label {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
  text-transform: uppercase;
  margin-bottom: 4px;
}
.field__value {
  font-size: var(--step-0);
  color: var(--ink);
}
.field__value code {
  font-size: var(--step-0);
  color: var(--ink-soft);
  word-break: break-all;
}
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}
.tag {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-soft);
  background: var(--paper-shade);
  border: 1px solid var(--paper-edge);
  border-radius: 2px;
  padding: 1px 6px;
}
.tag--hand {
  color: var(--signal-deep);
  border-color: var(--signal-deep);
}

.strip__hint {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-faint);
  margin-top: 12px;
}

/* ---------- Workspace ---------- */

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 26px;
  align-items: start;
}

/* ---------- Rack ---------- */

.rack-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding-bottom: 10px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--rule);
}
.rack-title {
  margin: 0;
  font-size: var(--step-1);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.rack-count {
  font-family: var(--mono);
  font-size: var(--step-0);
  color: var(--board-muted);
}

.bay-group {
  margin-bottom: 22px;
}

.bay-group__head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 0 9px;
}
.bay-group__tab {
  width: 9px;
  height: 9px;
  border-radius: 1px;
  background: var(--tab, var(--board-muted));
}
.bay-group__title {
  margin: 0;
  font-size: var(--step-0);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--board-muted);
}
.bay-group__meta {
  margin-left: auto;
  font-family: var(--mono);
  font-size: var(--step-0);
  color: var(--board-faint);
}

.rack {
  position: relative;
  display: grid;
  gap: 8px;
  padding-left: 12px;
}
.rack::before {
  content: "";
  position: absolute;
  left: 0;
  top: -2px;
  bottom: -2px;
  width: 2px;
  background: var(--rule-strong);
}
.rack::after {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 8px;
  height: 2px;
  background: var(--rule-strong);
  box-shadow: 0 0 0 0 transparent;
}

/* Rack strip: a horizontal slip with a top tab */
.strip--rack {
  cursor: pointer;
  transition: transform 0.18s cubic-bezier(0.16, 1, 0.3, 1),
    box-shadow 0.18s ease;
}
.strip--rack:hover {
  transform: translate(-3px, -2px);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.4) inset,
    0 2px 0 var(--paper-edge), 0 16px 30px -20px rgba(0, 0, 0, 0.9),
    -9px 0 0 -5px var(--tab);
}
.strip--rack.is-pulled {
  transform: translate(-7px, -5px) rotate(-1.1deg);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.5) inset,
    0 3px 0 var(--paper-edge), 0 24px 44px -24px rgba(0, 0, 0, 0.95),
    -12px 0 0 -6px var(--tab);
  z-index: 2;
}
.strip--rack.is-pulled .strip__top {
  padding-bottom: 10px;
}

.strip--rack .strip__callsign {
  font-size: var(--step-1);
}
.strip--rack .strip__title {
  font-size: var(--step-0);
  color: var(--ink-soft);
}

.strip--rack .strip__top {
  grid-template-columns: auto 1fr auto auto;
  grid-template-areas: "tab head count stamp";
}

.strip__count {
  grid-area: count;
  align-self: center;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-faint);
  white-space: nowrap;
}

/* ---------- Side panels ---------- */

.side-col {
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: sticky;
  top: 68px;
}

.panel {
  background: var(--board-2);
  border: 1px solid var(--rule);
  border-radius: 4px;
  overflow: hidden;
}
.panel--plain {
  background: transparent;
}

.panel-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 10px 13px;
  border-bottom: 1px solid var(--rule);
}
.panel-title {
  margin: 0;
  font-size: var(--step-0);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--board-muted);
}
.panel-count {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--board-faint);
}

.panel-body {
  padding: 12px 13px;
  max-height: 268px;
  overflow-y: auto;
}

.panel-body::-webkit-scrollbar {
  width: 9px;
}
.panel-body::-webkit-scrollbar-track {
  background: var(--board);
}
.panel-body::-webkit-scrollbar-thumb {
  background: var(--rule-strong);
  border: 2px solid var(--board-2);
  border-radius: 6px;
}

.bulletin {
  padding: 9px 10px;
  background: var(--board);
  border: 1px solid var(--rule);
  border-radius: 3px;
  margin-bottom: 8px;
}
.bulletin:last-child {
  margin-bottom: 0;
}
.bulletin__q {
  font-size: var(--step-0);
  color: var(--board-text);
  margin: 0 0 5px;
}
.bulletin__meta {
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--board-faint);
}
.bulletin__meta .due {
  color: var(--notice);
}

.logentry {
  padding-bottom: 10px;
  margin-bottom: 10px;
  border-bottom: 1px solid var(--rule);
}
.logentry:last-child {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}
.logentry__date {
  font-family: var(--mono);
  font-size: var(--step-0);
  color: var(--board-text);
  margin: 0 0 4px;
}
.logentry__snippet {
  font-size: var(--step-0);
  color: var(--board-muted);
  line-height: 1.45;
  margin: 0;
}

.remarks {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}
.remarks li {
  display: grid;
  gap: 2px;
}
.remarks code {
  font-size: var(--step-0);
  color: var(--board-text);
  background: var(--board);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 3px 7px;
  width: fit-content;
}
.remarks span {
  font-size: 12px;
  color: var(--board-faint);
}

.empty {
  padding: 14px 4px;
  color: var(--board-faint);
  font-size: var(--step-0);
  line-height: 1.5;
}
.empty--paper {
  color: var(--ink-faint);
  text-align: center;
}

/* ---------- Footer ---------- */

.board-foot {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 40px;
  padding-top: 14px;
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--board-faint);
}

.noscript {
  max-width: 58ch;
  margin: 40px auto;
  padding: 16px;
  color: var(--board-text);
  border: 1px solid var(--rule-strong);
  border-radius: 4px;
}

/* ---------- Responsive (structural, not fluid type) ---------- */

@media (max-width: 1040px) {
  .workspace {
    grid-template-columns: minmax(0, 1fr);
  }
  .side-col {
    position: static;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  }
}

@media (max-width: 720px) {
  .board {
    padding: 12px 16px 56px;
  }
  .board-bar {
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "id actions"
      "search search";
    gap: 10px 12px;
  }
  .board-id {
    grid-area: id;
  }
  .board-actions {
    grid-area: actions;
  }
  .board-search {
    grid-area: search;
    max-width: none;
  }
  .btn-label {
    display: none;
  }
  .strip__top,
  .strip--rack .strip__top {
    grid-template-columns: auto 1fr;
    grid-template-areas:
      "tab stamp"
      "head head"
      "count count";
    gap: 6px 10px;
  }
  .strip--rack .strip__count {
    justify-self: start;
  }
  .strip--active .strip__callsign {
    font-size: var(--step-3);
  }
  .fields {
    grid-template-columns: 1fr;
  }
  .board-foot {
    flex-direction: column;
    gap: 4px;
  }
  .tminus-band {
    gap: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .strip--rack:hover,
  .strip--rack.is-pulled {
    transform: none;
  }
}