/* ClassKit. PixelKit tokens; square corners, one ink, mono for anything measured. */
* { box-sizing: border-box; }
html, body { height: 100%; }
body { margin: 0; background: var(--pk-paper); color: var(--pk-ink); font: 16px/1.5 var(--pk-sans); }
button, input, textarea { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: 0; border-radius: 0; padding: 0; }
:focus-visible { outline: 2px solid var(--pk-blue); outline-offset: 2px; }
.mono { font: 13px/1.5 var(--pk-mono); color: var(--pk-faint); }
.wrap { max-width: 960px; margin: 0 auto; padding: 40px 24px 96px; }
h1 { margin: 0 0 8px; font: 600 30px/1.2 var(--pk-sans); }
h2 { margin: 36px 0 8px; padding-top: 14px; border-top: 1px solid var(--pk-rule); font: 600 18px/1.3 var(--pk-sans); }
.lead { margin: 0 0 24px; max-width: 640px; color: var(--pk-muted); font-size: 18px; line-height: 1.6; }
.field { display: grid; gap: 4px; margin-bottom: 16px; max-width: 360px; }
.field label { font: 13px/1.5 var(--pk-mono); color: var(--pk-faint); }
.field input { height: 44px; padding: 0 2px; background: none; border: 0; border-bottom: 1px solid var(--pk-rule); border-radius: 0; }
.field input:focus { border-bottom-color: var(--pk-ink); outline: 0; }
.pri { min-height: 44px; padding: 0 18px; background: var(--pk-primary); color: var(--pk-on-primary); box-shadow: inset 0 0 0 1px var(--pk-primary-edge); font-weight: 600; }
.pri:disabled { opacity: .5; cursor: default; }
.sec { min-height: 36px; padding: 0 12px; box-shadow: inset 0 0 0 1px var(--pk-rule); }
.sec:hover, .link:hover { background: var(--pk-soft); }
.link { min-height: 32px; padding: 0 6px; color: var(--pk-muted); }
.err { color: var(--pk-crit); min-height: 24px; }
.bar { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.spacer { flex: 1; }

/* gallery */
.rows { display: grid; }
.row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 2px 16px; padding: 12px 0; border-top: 1px solid var(--pk-hair); text-align: left; width: 100%; }
.row:hover { background: var(--pk-soft); }
.row b { font-weight: 600; }
.row .who { color: var(--pk-muted); font-size: 14px; }
.row .when { font: 13px/1.6 var(--pk-mono); color: var(--pk-faint); }
.sq { display: inline-block; width: 8px; height: 8px; margin-right: 8px; background: var(--pk-blue); }
.sq.mine { background: var(--pk-violet); }
.empty { padding: 24px 0; color: var(--pk-faint); }

/* builder */
.build { display: grid; grid-template-columns: minmax(320px, 420px) minmax(0, 1fr); height: 100vh; }
.chat { display: flex; flex-direction: column; min-height: 0; border-right: 1px solid var(--pk-rule); }
.chat header { padding: 12px 16px; border-bottom: 1px solid var(--pk-hair); display: flex; gap: 8px; align-items: center; }
.chat header input { flex: 1; min-width: 0; height: 32px; background: none; border: 0; font-weight: 600; }
.msgs { flex: 1; overflow-y: auto; padding: 8px 16px 16px; }
.msg { margin-top: 14px; white-space: pre-wrap; overflow-wrap: anywhere; }
.msg .by { font: 12px/1.6 var(--pk-mono); color: var(--pk-faint); }
.msg.me { color: var(--pk-muted); }
.hint { margin-top: 16px; color: var(--pk-faint); }
.hint button { display: block; margin-top: 6px; text-align: left; color: var(--pk-muted); text-decoration: underline; text-decoration-color: var(--pk-rule); text-underline-offset: 3px; }
.compose { padding: 12px 16px 16px; border-top: 1px solid var(--pk-hair); display: grid; gap: 8px; }
.compose textarea { width: 100%; min-height: 72px; max-height: 40vh; resize: vertical; padding: 10px 12px; background: var(--pk-card); border: 0; border-bottom: 1px solid var(--pk-ink); border-radius: 0; }
.compose textarea:focus { outline: 0; }
.stage { display: flex; flex-direction: column; min-width: 0; min-height: 0; }
.stage header { padding: 8px 16px; border-bottom: 1px solid var(--pk-hair); display: flex; gap: 8px; align-items: center; }
.stage iframe { flex: 1; width: 100%; border: 0; background: #fff; }
.stage pre { flex: 1; margin: 0; padding: 16px; overflow: auto; font: 13px/1.5 var(--pk-mono); white-space: pre-wrap; overflow-wrap: anywhere; }
kbd { font: 12px/1 var(--pk-mono); padding: 3px 5px; background: var(--pk-key); box-shadow: inset 0 -1px 0 var(--pk-key-edge); color: var(--pk-muted); }
@media (max-width: 820px) {
  .build { grid-template-columns: 1fr; grid-template-rows: 55vh 45vh; height: auto; min-height: 100vh; }
  .chat { border-right: 0; border-bottom: 1px solid var(--pk-rule); }
}

/* teacher */
table { border-collapse: collapse; width: 100%; font: 14px/1.5 var(--pk-mono); }
th, td { text-align: left; padding: 8px 12px 8px 0; border-bottom: 1px solid var(--pk-hair); }
th { color: var(--pk-faint); font-weight: 500; border-bottom-color: var(--pk-rule); }
td.n, th.n { text-align: right; font-variant-numeric: tabular-nums; }
td.name { font-family: var(--pk-sans); font-size: 15px; }