/* Seatwork — paper-and-ink classroom utility.
   One accent (brick) for conflict, one (teal) for agent authorship. Nothing else is colored. */

:root {
  --paper:      #fffaf2;
  --paper-sunk: #f6efe2;
  --ink:        #1d2a31;
  --ink-soft:   #55646c;
  --ink-faint:  #8a959b;
  --rule:       #e2d9c9;
  --rule-firm:  #cabfa9;
  --brick:      #b4451f;
  --brick-wash: #f7e6de;
  --teal:       #26666a;
  --teal-wash:  #e2eeed;

  --s1: .25rem; --s2: .5rem; --s3: .75rem; --s4: 1rem; --s5: 1.5rem; --s6: 2.25rem;
  --ui: 'Sora', ui-sans-serif, system-ui, sans-serif;
  --prose: 'Source Serif 4', Georgia, serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--ui);
  font-size: 1rem;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.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;
}

.app { display: flex; flex-direction: column; min-height: 100%; }

/* ── topbar ─────────────────────────────────────────────────────── */

.topbar {
  display: flex; align-items: center; gap: var(--s4);
  padding: var(--s3) var(--s5);
  border-bottom: 1px solid var(--rule-firm);
  background: var(--paper);
  flex-wrap: wrap;
}

.brand { display: flex; align-items: center; gap: var(--s3); }

.brand-mark {
  width: 22px; height: 22px; flex: none;
  background:
    linear-gradient(var(--ink), var(--ink)) 0 0 / 9px 7px no-repeat,
    linear-gradient(var(--ink), var(--ink)) 13px 0 / 9px 7px no-repeat,
    linear-gradient(var(--ink), var(--ink)) 0 11px / 9px 7px no-repeat,
    linear-gradient(var(--ink), var(--ink)) 13px 11px / 9px 7px no-repeat;
}

.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text b { font-weight: 700; font-size: 1.0625rem; letter-spacing: -.01em; }
.brand-text i { font-family: var(--prose); font-style: italic; font-size: .8125rem; color: var(--ink-soft); }

.title-field { flex: 1 1 12rem; min-width: 8rem; }

.title-field input {
  width: 100%;
  font-family: var(--prose); font-size: 1.0625rem; color: var(--ink);
  background: transparent; border: 0; border-bottom: 1px dashed var(--rule-firm);
  padding: var(--s1) var(--s2);
}
.title-field input:focus-visible { outline: 2px solid var(--teal); outline-offset: 2px; border-bottom-color: transparent; }

.agent-badge {
  display: inline-flex; align-items: center; gap: var(--s2);
  font-size: .75rem; letter-spacing: .02em;
  padding: var(--s1) var(--s3);
  border: 1px solid var(--rule-firm); border-radius: 999px;
  color: var(--ink-soft); white-space: nowrap;
}
.agent-badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--ink-faint); flex: none; }
.agent-badge[data-state="on"] { color: var(--teal); border-color: var(--teal); background: var(--teal-wash); }
.agent-badge[data-state="on"] .dot { background: var(--teal); }

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

/* ── buttons + fields ───────────────────────────────────────────── */

.btn {
  font-family: var(--ui); font-size: .8125rem; font-weight: 500;
  padding: .4rem .8rem;
  color: var(--ink); background: var(--paper);
  border: 1px solid var(--rule-firm); border-radius: 3px;
  cursor: pointer;
}
.btn:hover { background: var(--paper-sunk); }
.btn:focus-visible { outline: 2px solid var(--teal); outline-offset: 2px; }
.btn:disabled { opacity: .4; cursor: not-allowed; }
.btn-primary { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn-primary:hover { background: #2b3d47; }

.stack { display: flex; flex-direction: column; gap: var(--s3); }
.stack-tight { gap: var(--s2); }
.field-row { display: flex; gap: var(--s2); }
.field { display: flex; flex-direction: column; gap: var(--s1); flex: 1; min-width: 0; }
.field > span { font-size: .6875rem; text-transform: uppercase; letter-spacing: .07em; color: var(--ink-faint); }

.field input, .field select, .inline-field input {
  font-family: var(--ui); font-size: .875rem; color: var(--ink);
  padding: .35rem .5rem;
  background: var(--paper);
  border: 1px solid var(--rule-firm); border-radius: 3px;
  min-width: 0;
}
.field input:focus-visible, .field select:focus-visible, .inline-field input:focus-visible {
  outline: 2px solid var(--teal); outline-offset: 1px;
}

.inline-field { display: inline-flex; align-items: center; gap: var(--s2); font-size: .75rem; color: var(--ink-faint); }
.inline-field input { width: 3.25rem; }

/* ── layout ─────────────────────────────────────────────────────── */

.grid {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(13rem, 15rem) minmax(0, 1fr) minmax(15rem, 18rem);
  align-items: start;
}

.panel { padding: var(--s4) var(--s5); min-width: 0; }
.panel-roster { border-right: 1px solid var(--rule); }
.panel-side { border-left: 1px solid var(--rule); }

.panel-head {
  display: flex; align-items: baseline; justify-content: space-between; gap: var(--s2);
  margin: 0 0 var(--s3);
}
.panel-head-sub { margin-top: var(--s5); padding-top: var(--s3); border-top: 1px solid var(--rule); }

.panel-head h2 { font-size: .75rem; font-weight: 600; text-transform: uppercase; letter-spacing: .1em; margin: 0; }
.panel-head h3 { font-size: .6875rem; font-weight: 600; text-transform: uppercase; letter-spacing: .09em; margin: 0; color: var(--ink-soft); }
.count { font-family: var(--mono); font-size: .6875rem; color: var(--ink-faint); }

/* ── roster bench ───────────────────────────────────────────────── */

.bench {
  display: flex; flex-wrap: wrap; gap: var(--s2);
  min-height: 4.5rem; padding: var(--s2);
  background: var(--paper-sunk);
  border: 1px dashed var(--rule-firm); border-radius: 4px;
}
.bench.drop-target { border-color: var(--teal); background: var(--teal-wash); }
.bench-empty { margin: auto; font-family: var(--prose); font-size: .8125rem; color: var(--ink-faint); font-style: italic; }

/* ── student chip ───────────────────────────────────────────────── */

.chip {
  display: inline-flex; align-items: center; gap: .375rem;
  max-width: 100%;
  padding: .25rem .45rem;
  font-size: .8125rem; line-height: 1.2;
  background: var(--paper); color: var(--ink);
  border: 1px solid var(--rule-firm); border-radius: 3px;
  cursor: grab; user-select: none;
}
.chip:active { cursor: grabbing; }
.chip.dragging { opacity: .35; }
.chip.flash { animation: flash 900ms ease-out; }
.chip-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

@keyframes flash {
  0%   { background: var(--teal-wash); box-shadow: 0 0 0 3px var(--teal-wash); }
  100% { background: var(--paper);     box-shadow: 0 0 0 0 transparent; }
}
@media (prefers-reduced-motion: reduce) {
  .chip.flash { animation: none; outline: 2px solid var(--teal); }
}

.trait {
  font-family: var(--mono); font-size: .5625rem; font-weight: 500;
  width: 1.1em; height: 1.1em; line-height: 1.1em; text-align: center;
  border-radius: 2px; flex: none;
  background: var(--paper-sunk); color: var(--ink-soft);
  border: 1px solid var(--rule-firm);
}
.trait[data-t="extending"] { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.trait[data-t="emerging"]  { background: var(--paper); color: var(--ink-faint); }
.trait[data-t="front"], .trait[data-t="lowdistraction"], .trait[data-t="multilingual"] {
  background: var(--teal-wash); color: var(--teal); border-color: #b9d4d2;
}
.chip.conflict { border-color: var(--brick); background: var(--brick-wash); }

/* ── room ───────────────────────────────────────────────────────── */

.front-band {
  font-size: .625rem; text-transform: uppercase; letter-spacing: .18em;
  color: var(--ink-faint); text-align: center;
  padding: var(--s2) 0;
  border-top: 2px solid var(--ink);
  margin-bottom: var(--s4);
}

.room {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
  gap: var(--s4);
  align-content: start;
}

.table {
  background: var(--paper-sunk);
  border: 1px solid var(--rule-firm);
  border-radius: 4px;
  padding: var(--s3);
  display: flex; flex-direction: column; gap: var(--s2);
}
.table.front-row { border-color: var(--ink); }

.table-head {
  display: flex; align-items: baseline; justify-content: space-between; gap: var(--s2);
  font-size: .6875rem; letter-spacing: .06em; text-transform: uppercase; color: var(--ink-soft);
}
.table-head .fill { font-family: var(--mono); color: var(--ink-faint); }

.seats { display: flex; flex-direction: column; gap: var(--s1); }

.seat {
  min-height: 2rem;
  display: flex; align-items: center;
  padding: 2px;
  border: 1px dashed transparent;
  border-radius: 3px;
}
.seat.empty { border-color: var(--rule-firm); }
.seat.drop-target { border-color: var(--teal); border-style: solid; background: var(--teal-wash); }
.seat .chip { width: 100%; }

.room-hint {
  font-family: var(--prose); font-size: .8125rem; font-style: italic;
  color: var(--ink-faint); margin: var(--s5) 0 0;
}

/* ── rules, conflicts, log ──────────────────────────────────────── */

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

.rules li {
  display: flex; align-items: baseline; justify-content: space-between; gap: var(--s2);
  font-size: .8125rem;
  padding: .3rem 0;
  border-bottom: 1px solid var(--rule);
}
.rules li b { font-weight: 500; }
.rules .rule-kind {
  font-family: var(--mono); font-size: .625rem; text-transform: uppercase;
  letter-spacing: .04em; color: var(--ink-faint);
}
.rule-drop {
  border: 0; background: none; cursor: pointer; color: var(--ink-faint);
  font-size: 1rem; line-height: 1; padding: 0 .2rem;
}
.rule-drop:hover { color: var(--brick); }

.rules-empty, .violations-ok {
  font-family: var(--prose); font-style: italic; font-size: .8125rem;
  color: var(--ink-faint); margin: var(--s2) 0 0;
}

.violations li {
  font-family: var(--prose); font-size: .8125rem;
  color: var(--brick);
  padding: .25rem 0 .25rem var(--s3);
  border-bottom: 1px solid var(--rule);
  position: relative;
}
.violations li::before { content: "•"; position: absolute; left: 0; }

.log {
  font-size: .75rem;
  max-height: 12rem; overflow-y: auto;
  display: flex; flex-direction: column-reverse;
}
.log li { padding: .25rem 0; border-bottom: 1px solid var(--rule); color: var(--ink-soft); }
.log li .who {
  font-family: var(--mono); font-size: .625rem; text-transform: uppercase;
  letter-spacing: .05em; margin-right: .4rem;
}
.log li[data-who="agent"] .who { color: var(--teal); }
.log li[data-who="you"] .who { color: var(--ink-faint); }

/* ── responsive ─────────────────────────────────────────────────── */

@media (max-width: 60rem) {
  .grid { grid-template-columns: 1fr; }
  .panel-roster { border-right: 0; border-bottom: 1px solid var(--rule); }
  .panel-side { border-left: 0; border-top: 1px solid var(--rule); }
  .log { max-height: 9rem; }
}

/* ── print: the chart is the point ──────────────────────────────── */

@media print {
  .panel-roster, .panel-side, .topbar-actions, .agent-badge, .room-hint, .room-controls { display: none; }
  body { background: #fff; }
  .grid { grid-template-columns: 1fr; }
  .panel { padding: 0; }
  .table { break-inside: avoid; }
}

/* trait key — the chip letters mean nothing until you say what they mean */
.legend {
  display: flex; flex-wrap: wrap; gap: .3rem .7rem;
  margin: var(--s3) 0 0;
  font-size: .6875rem; color: var(--ink-faint);
}
.legend span { display: inline-flex; align-items: center; gap: .3rem; }
.legend .trait { font-weight: 500; }

/* Says out loud what a code comment cannot: nobody in this roster is real.
   Hides itself the moment the roster stops being the bundled demo. */
.demo-chip {
  font-size: .6875rem; letter-spacing: .02em; white-space: nowrap;
  padding: var(--s1) var(--s3);
  color: var(--brick); background: var(--brick-wash);
  border: 1px solid #e6c9bc; border-radius: 999px;
}

/* Keyboard path for moving a student, because drag events do not fire on touch
   and a chart about accommodations that only works with a mouse is a bad joke. */
.chip:focus-visible { outline: 2px solid var(--teal); outline-offset: 2px; }
.chip[aria-grabbed="true"] { border-color: var(--teal); background: var(--teal-wash); border-style: solid; }
.seat.keyboard-target { border-color: var(--teal); border-style: solid; }

/* paste-a-class-list disclosure */
.disclosure { margin-top: var(--s3); border-top: 1px solid var(--rule); padding-top: var(--s3); }
.disclosure summary {
  font-size: .6875rem; text-transform: uppercase; letter-spacing: .09em;
  color: var(--ink-soft); cursor: pointer; list-style: none;
}
.disclosure summary::before { content: "+ "; font-family: var(--mono); }
.disclosure[open] summary::before { content: "− "; }
.disclosure summary::-webkit-details-marker { display: none; }
.disclosure summary:focus-visible { outline: 2px solid var(--teal); outline-offset: 2px; }
.disclosure > div { margin-top: var(--s3); }
.disclosure .field > span { text-transform: none; letter-spacing: 0; font-size: .6875rem; }
.disclosure code { font-family: var(--mono); font-size: .625rem; color: var(--ink-soft); }
#import-text {
  font-family: var(--mono); font-size: .75rem; line-height: 1.5; color: var(--ink);
  padding: .4rem .5rem; background: var(--paper);
  border: 1px solid var(--rule-firm); border-radius: 3px; resize: vertical; width: 100%;
}
#import-text:focus-visible { outline: 2px solid var(--teal); outline-offset: 1px; }