/* Layout: app shell — top bar, notice strip, then a workbench of resizable panes
   (question list | problem | drag handle | editor); stacks into one column on phones. */
:root {
  --bg: #f3f5f8;
  --surface: #ffffff;
  --sunk: #eef1f6;
  --ink: #18212e;
  --muted: #5a6577;
  --line: #d9dfe8;
  --accent: #2b5a96;
  --accent-ink: #ffffff;
  --mark: #f2c230;
  --mark-bg: #fdf6dc;
  --mark-ink: #6b5200;
  --pass: #1d7f52;
  --pass-bg: #e3f4ec;
  --fail: #b9411b;
  --fail-bg: #fbe9e2;
  --tried: #a86a00;
  --code-bg: #f7f8fb;
  --scrim: rgba(18, 24, 33, .45);
  --font-body: "Atkinson Hyperlegible", "Segoe UI", system-ui, sans-serif;
  --font-display: "Sora", "Segoe UI", system-ui, sans-serif;
  --font-code: "JetBrains Mono", ui-monospace, "Cascadia Code", Consolas, monospace;
  --radius: 8px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #11151b; --surface: #181d25; --sunk: #141920; --ink: #e5e9f0; --muted: #96a1b2; --line: #29313d;
    --accent: #7ea9e3; --accent-ink: #0e1622; --mark: #f2c230; --mark-bg: #2b2611; --mark-ink: #f3d77a;
    --pass: #5cc995; --pass-bg: #15291f; --fail: #f08a63; --fail-bg: #2e1a13; --tried: #e0a93a;
    --code-bg: #12171e; --scrim: rgba(0, 0, 0, .6); color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #11151b; --surface: #181d25; --sunk: #141920; --ink: #e5e9f0; --muted: #96a1b2; --line: #29313d;
  --accent: #7ea9e3; --accent-ink: #0e1622; --mark: #f2c230; --mark-bg: #2b2611; --mark-ink: #f3d77a;
  --pass: #5cc995; --pass-bg: #15291f; --fail: #f08a63; --fail-bg: #2e1a13; --tried: #e0a93a;
  --code-bg: #12171e; --scrim: rgba(0, 0, 0, .6); color-scheme: dark;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { height: 100%; }
body { background: var(--bg); color: var(--ink); font-family: var(--font-body); font-size: 15px; line-height: 1.55; }
body::before { content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px); z-index: 10; background: var(--surface); }
button, select, textarea, input { font: inherit; color: inherit; }
button { cursor: pointer; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
code, pre, .mono { font-family: var(--font-code); }
.app { display: flex; flex-direction: column; height: 100%; }

/* ---------- top bar ---------- */
.top {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap; flex: none;
  padding-block: 10px;
  padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px));
  background: var(--surface); border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--font-display); font-weight: 700; font-size: 17px; letter-spacing: -0.01em; }
.brand .prompt { font-family: var(--font-code); font-size: 13px; font-weight: 600; color: var(--accent); background: var(--sunk); border: 1px solid var(--line); border-radius: 6px; padding: 2px 7px; }
.brand .prompt b { color: var(--mark); }
.progress { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: 13px; font-variant-numeric: tabular-nums; }
.meter { width: 110px; height: 6px; border-radius: 3px; background: var(--sunk); border: 1px solid var(--line); overflow: hidden; }
.meter i { display: block; height: 100%; width: 0; background: var(--pass); transition: width .3s; }
.teacher { display: flex; gap: 8px; align-items: center; }
.teacher .tag { font-size: 11px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--mark-ink); background: var(--mark-bg); border: 1px solid var(--mark); border-radius: 4px; padding: 1px 6px; }
.engine { margin-left: auto; display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--tried); flex: none; }
.engine.ready .dot { background: var(--pass); }
.engine.failed .dot { background: var(--fail); }
.picker { display: none; }

/* ---------- notices ---------- */
.notices { flex: none; background: var(--mark-bg); border-bottom: 1px solid var(--line);
  padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }
.notices > summary { list-style: none; cursor: pointer; padding-block: 7px; font-size: 13px; font-weight: 700; color: var(--mark-ink); display: flex; gap: 8px; align-items: center; }
.notices > summary::-webkit-details-marker { display: none; }
.notices > summary::before { content: "▸"; transition: transform .15s; }
.notices[open] > summary::before { transform: rotate(90deg); }
.notice-list { display: grid; gap: 8px; padding-bottom: 10px; max-height: 30vh; overflow: auto; }
.note { background: var(--surface); border: 1px solid var(--line); border-left: 3px solid var(--mark); border-radius: 6px; padding: 8px 12px; display: flex; gap: 12px; align-items: flex-start; }
.note .body { flex: 1; min-width: 0; white-space: pre-wrap; overflow-wrap: anywhere; }
.note .meta { font-size: 12px; color: var(--muted); margin-top: 2px; }

/* ---------- workbench ---------- */
.bench {
  flex: 1; min-height: 0;
  display: grid; grid-template-columns: var(--list-w, 250px) minmax(0, var(--prob-fr, 1fr)) 14px minmax(0, var(--ed-fr, 1fr));
  padding-block: 14px;
  padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px));
}
.bench.list-collapsed { --list-w: 46px; }
.bench.prob-collapsed { grid-template-columns: var(--list-w, 250px) 0 0 minmax(0, 1fr); }
.bench.prob-collapsed .problem, .bench.prob-collapsed .vhandle { display: none; }
.bench > .list { grid-column: 1; } .bench > .problem { grid-column: 2; } .bench > .vhandle { grid-column: 3; } .bench > .editor-pane { grid-column: 4; }
.pane { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); min-width: 0; min-height: 0; }
.pane-head { display: flex; align-items: center; gap: 8px; padding: 8px 10px 8px 14px; border-bottom: 1px solid var(--line); flex: none; }
.pane-title { font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); flex: 1; min-width: 0; }
.icon-btn { border: 1px solid transparent; background: none; border-radius: 6px; width: 28px; height: 28px; display: inline-grid; place-items: center; color: var(--muted); font-size: 15px; line-height: 1; flex: none; }
.icon-btn:hover { background: var(--sunk); border-color: var(--line); color: var(--ink); }

/* question list */
.list { display: flex; flex-direction: column; margin-right: 14px; overflow: hidden; }
.list-body { overflow: auto; padding: 4px 0 10px; flex: 1; min-height: 0; }
.list-rail { display: none; flex-direction: column; align-items: center; gap: 10px; padding: 8px 0; }
.list-rail .count { writing-mode: vertical-rl; font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; }
.bench.list-collapsed .list-body, .bench.list-collapsed .list .pane-head { display: none; }
.bench.list-collapsed .list-rail { display: flex; }
.unit { padding: 12px 14px 4px; font-size: 11px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.unit.custom { color: var(--mark-ink); }
.qlink { display: flex; align-items: center; gap: 10px; width: 100%; text-align: left; border: 0; background: none; padding: 6px 14px; font-size: 14px; border-left: 3px solid transparent; }
.qlink:hover { background: var(--sunk); }
.qlink[aria-current="true"] { background: var(--sunk); border-left-color: var(--mark); font-weight: 700; }
.qlink .num { font-family: var(--font-code); font-size: 12px; color: var(--muted); width: 30px; flex: none; font-variant-numeric: tabular-nums; }
.qlink .name { flex: 1; min-width: 0; }
.state { width: 16px; height: 16px; flex: none; border-radius: 50%; border: 1.5px solid var(--line); display: grid; place-items: center; font-size: 10px; line-height: 1; }
.state.solved { background: var(--pass); border-color: var(--pass); color: var(--surface); }
.state.tried { border-color: var(--tried); }
.state.tried::after { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--tried); }
.list-foot { border-top: 1px solid var(--line); padding: 8px 14px; font-size: 12px; color: var(--muted); flex: none; }

/* problem */
.problem { display: flex; flex-direction: column; overflow: hidden; }
.problem-body { overflow: auto; padding: 18px 22px 26px; flex: 1; min-height: 0; }
.eyebrow { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; font-size: 12px; color: var(--muted); }
.chip { font-size: 11px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; padding: 2px 8px; border-radius: 999px; border: 1px solid var(--line); }
.chip.easy { color: var(--pass); border-color: currentColor; }
.chip.medium, .chip.hard { color: var(--tried); border-color: currentColor; }
.chip.hard { color: var(--fail); }
.chip.custom { color: var(--mark-ink); background: var(--mark-bg); border-color: var(--mark); }
.problem h1 { font-family: var(--font-display); font-size: 24px; line-height: 1.2; letter-spacing: -0.015em; margin: 8px 0 14px; text-wrap: balance; }
.problem h2 { font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin: 22px 0 8px; }
.problem p { margin: 0 0 10px; max-width: 68ch; }
.problem ul { margin: 0; padding-left: 20px; display: grid; gap: 4px; }
.problem code { font-size: 0.88em; background: var(--sunk); border: 1px solid var(--line); border-radius: 4px; padding: 0 4px; }
.tnote { background: var(--mark-bg); border: 1px solid var(--mark); border-radius: var(--radius); padding: 10px 12px; margin: 0 0 14px; display: grid; gap: 8px; }
.tnote .lbl { font-size: 11px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--mark-ink); }
.tnote .row { display: flex; gap: 10px; align-items: flex-start; }
.tnote .row .body { flex: 1; min-width: 0; white-space: pre-wrap; overflow-wrap: anywhere; }
.owner-bar { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-top: 10px; }
.tbl { overflow-x: auto; margin: 6px 0 12px; }
.tbl table { border-collapse: collapse; width: 100%; font-size: 14px; }
.tbl th, .tbl td { border: 1px solid var(--line); padding: 6px 10px; text-align: left; vertical-align: top; }
.tbl th { background: var(--sunk); font-weight: 700; }
.samples { display: grid; gap: 12px; }
.sample { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.sample .cap { display: flex; justify-content: space-between; align-items: center; padding: 6px 12px; background: var(--sunk); border-bottom: 1px solid var(--line); font-size: 13px; color: var(--muted); }
.io { display: grid; grid-template-columns: 1fr 1fr; }
.io > div { min-width: 0; padding: 8px 12px; }
.io > div + div { border-left: 1px solid var(--line); }
.io .lbl { font-size: 11px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); margin-bottom: 4px; }
.io pre { margin: 0; font-size: 13px; white-space: pre; overflow-x: auto; }
.linkbtn { border: 0; background: none; color: var(--accent); font-size: 13px; padding: 0; text-decoration: underline; text-underline-offset: 2px; }
.solution { margin-top: 22px; border-top: 1px dashed var(--line); padding-top: 14px; }
.confirm { display: inline-flex; gap: 10px; align-items: center; font-size: 13px; color: var(--muted); flex-wrap: wrap; }
.solution pre { background: var(--code-bg); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 14px; font-size: 13px; overflow-x: auto; margin: 10px 0 0; }

/* drag handles */
.vhandle { display: grid; place-items: center; cursor: col-resize; touch-action: none; }
.vhandle::before { content: ""; width: 4px; height: 44px; border-radius: 2px; background: var(--line); transition: background .15s, height .15s; }
.vhandle:hover::before, .vhandle:focus-visible::before, .vhandle.dragging::before { background: var(--accent); height: 72px; }
.hhandle { height: 10px; flex: none; display: grid; place-items: center; cursor: row-resize; touch-action: none; border-top: 1px solid var(--line); background: var(--sunk); }
.hhandle::before { content: ""; height: 3px; width: 44px; border-radius: 2px; background: var(--line); }
.hhandle:hover::before, .hhandle:focus-visible::before, .hhandle.dragging::before { background: var(--accent); width: 72px; }
body.resizing { user-select: none; }
body.resizing.col { cursor: col-resize; }
body.resizing.row { cursor: row-resize; }

/* editor */
.editor-pane { display: flex; flex-direction: column; overflow: hidden; }
.ed-head { display: flex; align-items: center; gap: 8px; padding: 8px 10px; border-bottom: 1px solid var(--line); flex-wrap: wrap; flex: none; }
.file { font-family: var(--font-code); font-size: 13px; color: var(--muted); }
.file b { color: var(--ink); font-weight: 600; }
.saved { font-size: 12px; color: var(--muted); }
.spacer { flex: 1; }
.btn { border: 1px solid var(--line); background: var(--surface); border-radius: 6px; padding: 6px 12px; font-size: 14px; font-weight: 700; display: inline-flex; align-items: center; gap: 6px; white-space: nowrap; }
a.btn, label.btn { text-decoration: none; color: inherit; cursor: pointer; }
.btn:hover { background: var(--sunk); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.primary:hover { filter: brightness(1.08); }
.btn.warn { color: var(--fail); }
.btn.mark { background: var(--mark-bg); border-color: var(--mark); color: var(--mark-ink); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn.quiet { font-weight: 400; color: var(--muted); }
.btn.sm { padding: 3px 9px; font-size: 13px; }
.kbd { font-family: var(--font-code); font-size: 11px; opacity: .75; font-weight: 400; }
.code { display: grid; grid-template-columns: auto 1fr; background: var(--code-bg); height: var(--code-h, 55%); min-height: 120px; flex: none; }
.editor-pane.out-collapsed .code { flex: 1; height: auto; }
.editor-pane.out-collapsed .hhandle, .editor-pane.out-collapsed .panel { display: none; }
.gutter { margin: 0; padding: 12px 8px 12px 12px; text-align: right; color: var(--muted); font-family: var(--font-code); font-size: 13.5px; line-height: 1.6; user-select: none; overflow: hidden; font-variant-numeric: tabular-nums; border-right: 1px solid var(--line); opacity: .8; }
#src { border: 0; resize: none; outline: none; background: transparent; padding: 12px; font-family: var(--font-code); font-size: 13.5px; line-height: 1.6; white-space: pre; overflow: auto; tab-size: 4; width: 100%; height: 100%; min-width: 0; }
.tabs { display: flex; align-items: center; border-bottom: 1px solid var(--line); background: var(--sunk); flex: none; }
.tab { border: 0; background: none; padding: 8px 14px; font-size: 13px; font-weight: 700; color: var(--muted); border-bottom: 2px solid transparent; margin-bottom: -1px; }
.tab[aria-selected="true"] { color: var(--ink); border-bottom-color: var(--accent); background: var(--surface); }
.tabs .icon-btn { margin-left: auto; margin-right: 6px; }
.out-only { display: none; }
.editor-pane.out-collapsed .out-only { display: inline-flex; }
.panel { padding: 12px; overflow: auto; flex: 1; min-height: 0; }
.panel textarea { width: 100%; min-height: 70px; border: 1px solid var(--line); border-radius: 6px; background: var(--code-bg); padding: 8px 10px; font-family: var(--font-code); font-size: 13px; resize: vertical; }
.small { font-size: 12px; color: var(--muted); }
.out { margin: 10px 0 0; background: var(--code-bg); border: 1px solid var(--line); border-radius: 6px; padding: 8px 10px; font-family: var(--font-code); font-size: 13px; white-space: pre-wrap; word-break: break-word; min-height: 38px; }
.out.err { color: var(--fail); background: var(--fail-bg); border-color: color-mix(in srgb, var(--fail) 35%, transparent); }
.summary { display: flex; align-items: center; gap: 10px; font-weight: 700; margin-bottom: 10px; font-variant-numeric: tabular-nums; }
.summary.ok { color: var(--pass); }
.summary.bad { color: var(--fail); }
.case { border: 1px solid var(--line); border-radius: 6px; margin-bottom: 8px; overflow: hidden; }
.case summary { list-style: none; display: flex; align-items: center; gap: 10px; padding: 7px 10px; cursor: pointer; font-size: 14px; }
.case summary::-webkit-details-marker { display: none; }
.case .badge { font-size: 11px; font-weight: 700; letter-spacing: .05em; text-transform: uppercase; padding: 1px 7px; border-radius: 4px; }
.case.pass .badge { background: var(--pass-bg); color: var(--pass); }
.case.fail .badge { background: var(--fail-bg); color: var(--fail); }
.case .kind { color: var(--muted); font-size: 12px; margin-left: auto; }
.case .detail { border-top: 1px solid var(--line); display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.case .detail > div { padding: 8px 10px; min-width: 0; }
.case .detail > div + div { border-left: 1px solid var(--line); }
.case .detail pre { margin: 0; font-size: 12.5px; white-space: pre; overflow-x: auto; }
.case .detail .full { grid-column: 1 / -1; border-left: 0 !important; border-top: 1px solid var(--line); }
.hint { margin-top: 8px; font-size: 13px; color: var(--muted); }
.empty { color: var(--muted); font-size: 14px; }

/* ---------- teacher forms (sheet) ---------- */
.sheet-wrap { position: fixed; inset: 0; z-index: 20; background: var(--scrim); display: flex; justify-content: flex-end; }
.sheet { width: min(760px, 100%); height: 100%; background: var(--surface); border-left: 1px solid var(--line); display: flex; flex-direction: column;
  padding-top: env(safe-area-inset-top, 0px); padding-bottom: env(safe-area-inset-bottom, 0px); padding-right: env(safe-area-inset-right, 0px); }
.sheet-head { display: flex; align-items: center; gap: 10px; padding: 14px 18px; border-bottom: 1px solid var(--line); }
.sheet-head h2 { font-family: var(--font-display); font-size: 19px; margin: 0; flex: 1; }
.sheet-body { flex: 1; overflow: auto; padding: 16px 18px 24px; display: grid; gap: 16px; align-content: start; }
.sheet-foot { display: flex; gap: 10px; align-items: center; padding: 12px 18px; border-top: 1px solid var(--line); flex-wrap: wrap; }
.sheet-foot .msg { flex: 1; font-size: 13px; color: var(--muted); min-width: 160px; }
.sheet-foot .msg.err { color: var(--fail); }
.field { display: grid; gap: 5px; min-width: 0; }
.field > label, .field > .flabel { font-size: 13px; font-weight: 700; }
.field .help { font-size: 12px; color: var(--muted); }
.field input[type="text"], .field select, .field textarea { width: 100%; border: 1px solid var(--line); border-radius: 6px; background: var(--surface); padding: 7px 10px; font-size: 14px; }
.field textarea { resize: vertical; min-height: 70px; }
.field textarea.mono { font-family: var(--font-code); font-size: 13px; background: var(--code-bg); }
.row2 { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 12px; }
.tc { border: 1px solid var(--line); border-radius: var(--radius); padding: 10px; display: grid; gap: 8px; }
.tc-head { display: flex; align-items: center; gap: 10px; font-size: 13px; font-weight: 700; }
.tc-head label { font-weight: 400; display: inline-flex; gap: 6px; align-items: center; }
.tc-io { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.tc-io textarea { font-family: var(--font-code); font-size: 13px; background: var(--code-bg); border: 1px solid var(--line); border-radius: 6px; padding: 6px 8px; min-height: 64px; resize: vertical; width: 100%; }
.tcs { display: grid; gap: 10px; }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .app { height: auto; min-height: 100%; }
  .bench { display: flex; flex-direction: column; gap: 14px; flex: none; }
  .list, .vhandle { display: none !important; }
  .bench.prob-collapsed .problem { display: flex; }
  .problem, .editor-pane { overflow: visible; }
  .problem-body { overflow: visible; }
  .collapse-prob, .show-prob { display: none !important; }
  .code { height: 50vh; }
  .hhandle { display: none; }
  .panel { max-height: none; }
  .picker { display: block; flex: 1 1 100%; order: 5; }
  .picker select { width: 100%; padding: 6px 8px; border-radius: 6px; border: 1px solid var(--line); background: var(--surface); }
  .engine { margin-left: 0; }
  .meter { width: 70px; }
  .problem-body { padding: 16px; }
  .problem h1 { font-size: 21px; }
  .io, .tc-io, .row2 { grid-template-columns: 1fr; }
  .io > div + div { border-left: 0; border-top: 1px solid var(--line); }
  .case .detail { grid-template-columns: 1fr; }
  .case .detail > div + div { border-left: 0; border-top: 1px solid var(--line); }
}
@media (prefers-reduced-motion: reduce) { .meter i, .vhandle::before, .notices > summary::before { transition: none; } }

/* ---------- preview bar (student page) ---------- */
.preview-bar { flex: none; background: var(--accent); color: var(--accent-ink); font-size: 13px; padding-block: 7px;
  padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }
.preview-bar a { color: inherit; font-weight: 700; margin-left: 8px; }
.list-foot a { color: var(--muted); }

/* ---------- teacher page ---------- */
.t-app { min-height: 100%; display: flex; flex-direction: column; }
.t-top .status { font-size: 12px; font-weight: 700; padding: 2px 8px; border-radius: 999px; border: 1px solid var(--line); color: var(--muted); }
.t-top .status.dirty { color: var(--mark-ink); background: var(--mark-bg); border-color: var(--mark); }
.t-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-left: auto; }
.t-main { display: grid; grid-template-columns: minmax(300px, 420px) minmax(0, 1fr); gap: 16px; align-items: start;
  padding-block: 16px; padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }
.t-side { position: sticky; top: 12px; max-height: calc(100vh - 24px); display: flex; flex-direction: column; overflow: hidden; }
.t-side .panel { padding: 0; }
.t-scroll { overflow: auto; flex: 1; min-height: 0; padding: 6px 0 12px; }
.t-unit { display: flex; align-items: center; gap: 6px; padding: 12px 12px 4px 14px; }
.t-unit .unit { padding: 0; flex: 1; }
.t-q { display: flex; align-items: center; gap: 8px; padding: 5px 10px 5px 14px; font-size: 14px; border-left: 3px solid transparent; }
.t-q:hover { background: var(--sunk); }
.t-q.active { background: var(--sunk); border-left-color: var(--mark); }
.t-q .num { font-family: var(--font-code); font-size: 12px; color: var(--muted); width: 32px; flex: none; }
.t-q .name { flex: 1; min-width: 0; border: 0; background: none; text-align: left; padding: 0; }
.t-q .icon-btn { width: 24px; height: 24px; font-size: 13px; }
.t-add-unit { padding: 10px 14px; display: flex; gap: 8px; flex-wrap: wrap; }
.t-editor { padding: 18px 20px 22px; display: grid; gap: 16px; }
.t-editor h2.t-h { font-family: var(--font-display); font-size: 20px; margin: 0; }
.t-help { display: grid; gap: 12px; padding: 20px 22px; }
.t-help h2 { font-family: var(--font-display); font-size: 20px; margin: 0; }
.t-help ol { margin: 0; padding-left: 20px; display: grid; gap: 8px; max-width: 70ch; }
.t-help code { font-size: .88em; background: var(--sunk); border: 1px solid var(--line); border-radius: 4px; padding: 0 4px; }
.t-notes { display: grid; gap: 10px; padding: 12px 14px; }
.t-foot { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; border-top: 1px solid var(--line); padding-top: 14px; }
.t-foot .msg { flex: 1; min-width: 180px; font-size: 13px; color: var(--muted); }
.t-foot .msg.err { color: var(--fail); }
.t-foot .msg.ok { color: var(--pass); }
@media (max-width: 900px) {
  .t-main { grid-template-columns: minmax(0, 1fr); }
  .t-side { position: static; max-height: none; }
  .t-actions { margin-left: 0; }
}