@font-face {
  font-family: "Plex Sans";
  font-weight: 400;
  font-display: swap;
  src: url("fonts/plex-sans-400.woff2") format("woff2");
}
@font-face {
  font-family: "Plex Sans";
  font-weight: 500;
  font-display: swap;
  src: url("fonts/plex-sans-500.woff2") format("woff2");
}
@font-face {
  font-family: "Plex Sans";
  font-weight: 600;
  font-display: swap;
  src: url("fonts/plex-sans-600.woff2") format("woff2");
}
@font-face {
  font-family: "Source Serif";
  font-weight: 400;
  font-display: swap;
  src: url("fonts/source-serif-400.woff2") format("woff2");
}
@font-face {
  font-family: "Source Serif";
  font-weight: 600;
  font-display: swap;
  src: url("fonts/source-serif-600.woff2") format("woff2");
}

:root {
  --paper: #f1f4f4;
  --surface: #ffffff;
  --ink: #17222d;
  --ink-2: #53616e;
  --line: #d3dade;
  --line-soft: #e6eaec;
  --slate: #24384b;
  --action: #1f5486;
  --action-ink: #ffffff;
  --sq-dark: #7c95aa;
  --sq-light: #e7ecf0;
  --sq-last: #e9c95a;

  --keep: #17713f;
  --keep-bg: #e0f1e6;
  --optional: #7d5a00;
  --optional-bg: #f9edc9;
  --trim: #8a3d3a;
  --trim-bg: #f4e3e1;
  --added: #473c9e;
  --added-bg: #e8e5f8;
  --same: #53616e;
  --same-bg: #e9edef;

  --ui: "Plex Sans", "Segoe UI", system-ui, sans-serif;
  --book: "Source Serif", Georgia, "Times New Roman", serif;
  --indent: 16px;
}

* {
  box-sizing: border-box;
}
html {
  -webkit-text-size-adjust: 100%;
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 15px/1.5 var(--ui);
  font-variant-numeric: tabular-nums;
}
h1,
h2,
h3,
p {
  margin: 0;
}
h1 {
  font: 600 28px/1.2 var(--book);
  letter-spacing: -0.01em;
}
h2 {
  font: 600 19px/1.3 var(--book);
}
h3 {
  font: 600 15px/1.4 var(--ui);
}
a {
  color: var(--action);
  text-underline-offset: 2px;
}
small,
.muted {
  color: var(--ink-2);
}
small {
  font-size: 13px;
}
:focus-visible {
  outline: 2px solid var(--action);
  outline-offset: 2px;
}
[hidden] {
  display: none !important;
}

/* Page frame */
.mock-note {
  background: #fff6d6;
  border-bottom: 1px solid #e6d69a;
  color: #5c4700;
  font-size: 13px;
  padding: 5px 24px;
}
.top {
  display: flex;
  align-items: center;
  gap: 28px;
  background: var(--slate);
  color: #fff;
  padding: 0 24px;
  min-height: 52px;
  flex-wrap: wrap;
}
.top a {
  color: #dfe7ee;
  text-decoration: none;
}
.top .brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font: 600 18px/1 var(--book);
}
.brand-mark {
  width: 18px;
  height: 18px;
  border-radius: 3px;
  background: conic-gradient(
    var(--sq-light) 25%,
    var(--sq-dark) 0 50%,
    var(--sq-light) 0 75%,
    var(--sq-dark) 0
  );
}
.top nav {
  display: flex;
  gap: 4px;
  flex: 1;
}
.top nav a {
  padding: 15px 12px;
  border-bottom: 3px solid transparent;
}
.top nav a[aria-current="page"] {
  color: #fff;
  border-bottom-color: var(--sq-dark);
}
.top nav a:hover,
.who a:hover {
  color: #fff;
}
.who {
  font-size: 14px;
  display: flex;
  gap: 14px;
}
.who a {
  text-decoration: underline;
}
main {
  max-width: 1480px;
  margin: 0 auto;
  padding: 24px 24px 64px;
}
.narrow {
  max-width: 880px;
}
.page-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}
.page-head p {
  color: var(--ink-2);
  max-width: 70ch;
  margin-top: 4px;
}

.course-head {
  margin-bottom: 16px;
}
.course-head .crumbs {
  font-size: 13px;
  color: var(--ink-2);
}
.course-head .facts {
  color: var(--ink-2);
  font-size: 14px;
  margin-top: 2px;
}
.tabs {
  display: flex;
  gap: 2px;
  border-bottom: 1px solid var(--line);
  margin: 14px 0 22px;
  padding-bottom: 1px;
  overflow-x: auto;
  overflow-y: hidden;
}
.tabs a {
  padding: 9px 14px;
  color: var(--ink-2);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 3px solid transparent;
  margin-bottom: -1px;
}
.tabs a:hover {
  color: var(--ink);
}
.tabs a[aria-current="page"] {
  color: var(--ink);
  font-weight: 600;
  border-bottom-color: var(--action);
}

/* Surfaces, forms, buttons */
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 18px 20px;
}
.card + .card {
  margin-top: 16px;
}
.cols > .card {
  margin-top: 0;
}
.card > h2 {
  margin-bottom: 10px;
}
.stack > * + * {
  margin-top: 16px;
}
.cols {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  align-items: start;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font: 500 14px/1 var(--ui);
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--surface);
  color: var(--ink);
  text-decoration: none;
  cursor: pointer;
}
.btn:hover {
  border-color: var(--ink-2);
}
.btn.primary {
  background: var(--action);
  border-color: var(--action);
  color: var(--action-ink);
}
.btn.primary:hover {
  background: #17446e;
}
.btn.small {
  padding: 6px 10px;
  font-size: 13px;
}
.btn[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
}
.actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

.field {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 5px;
}
.field > select {
  width: 100%;
  text-overflow: ellipsis;
}
.field + .field {
  margin-top: 14px;
}
.field > label,
fieldset > legend {
  font-weight: 500;
  font-size: 14px;
}
.field .hint,
.hint {
  font-size: 13px;
  color: var(--ink-2);
}
fieldset {
  border: 0;
  padding: 0;
  margin: 0;
}
fieldset + fieldset,
fieldset + .field,
.field + fieldset {
  margin-top: 16px;
}
input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
select {
  font: inherit;
  padding: 8px 10px;
  border: 1px solid #8793a0;
  border-radius: 5px;
  background: #fff;
  color: var(--ink);
  max-width: 100%;
  box-sizing: border-box;
  height: 40px;
}
input[type="number"] {
  width: 110px;
}
.inline {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}
.inline:has(> .field) {
  align-items: end;
}
.inline > .field {
  margin-top: 0;
}
#defaults-form .inline > .field {
  min-width: 40%;
}
.choices {
  display: flex;
  gap: 6px 16px;
  flex-wrap: wrap;
  margin-top: 6px;
}
.choices label {
  display: inline-flex;
  gap: 6px;
  align-items: center;
  font-weight: 400;
}
.choices.column {
  flex-direction: column;
}
.seg {
  display: inline-flex;
  border: 1px solid #8793a0;
  border-radius: 5px;
  overflow: hidden;
  flex-wrap: wrap;
}
.seg label {
  position: relative;
}
.seg input {
  position: absolute;
  opacity: 0;
  inset: 0;
}
.seg span {
  display: block;
  padding: 7px 12px;
  border-right: 1px solid #8793a0;
  cursor: pointer;
  font-size: 14px;
  background: #fff;
}
.seg label:last-child span {
  border-right: 0;
}
.seg input:checked + span {
  background: var(--slate);
  color: #fff;
}
.seg input:focus-visible + span {
  outline: 2px solid var(--action);
  outline-offset: -2px;
}
.callout {
  background: #eaf1f7;
  border-left: 3px solid var(--action);
  padding: 10px 14px;
  border-radius: 0 5px 5px 0;
}
.callout strong {
  font-weight: 600;
}
details > summary {
  cursor: pointer;
  font-weight: 500;
}
details[open] > summary {
  margin-bottom: 12px;
}

/* Tables */
table {
  border-collapse: collapse;
  width: 100%;
}
.data th,
.data td {
  text-align: left;
  padding: 9px 12px;
  border-bottom: 1px solid var(--line-soft);
  vertical-align: top;
}
.data th {
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-2);
  border-bottom-color: var(--line);
  white-space: nowrap;
}
.data tr:last-child td {
  border-bottom: 0;
}
.data .num,
.tree .num {
  text-align: right;
  white-space: nowrap;
}
.data tfoot td {
  font-weight: 600;
  border-top: 1px solid var(--line);
}
.scroll-x {
  overflow-x: auto;
}
.line {
  font-family: var(--book);
}

/* Labels and flags */
.lab {
  display: inline-block;
  font: 600 12px/1 var(--ui);
  letter-spacing: 0.03em;
  padding: 4px 7px;
  border-radius: 3px;
  white-space: nowrap;
}
.lab.keep {
  color: var(--keep);
  background: var(--keep-bg);
}
.lab.optional {
  color: var(--optional);
  background: var(--optional-bg);
}
.lab.trim {
  color: var(--trim);
  background: var(--trim-bg);
}
.lab.added {
  color: var(--added);
  background: var(--added-bg);
}
.lab.same {
  color: var(--same);
  background: var(--same-bg);
}
.lab.comment {
  color: var(--same);
  background: var(--same-bg);
}
.lab.left-out {
  color: var(--trim);
  box-shadow: inset 0 0 0 1px var(--trim);
}
.flag {
  display: inline-block;
  font-size: 12px;
  line-height: 1;
  padding: 3px 6px;
  border: 1px solid currentColor;
  border-radius: 10px;
  white-space: nowrap;
  color: var(--ink-2);
}
.flag.master-protected {
  color: #1f5486;
}
.flag.critical {
  color: #a14a00;
}
.flag.trap {
  color: #8d2b6e;
}
.flag.blunder-branch {
  color: #b02a2a;
}
.flag.yours {
  color: var(--ink);
  border-style: dashed;
}

/* Board */
.board {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  aspect-ratio: 1;
  width: 100%;
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid #5d7386;
}
.sq {
  position: relative;
  aspect-ratio: 1;
  background: var(--sq-light);
}
.sq.d {
  background: var(--sq-dark);
}
.sq.last::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--sq-last);
  opacity: 0.6;
}
.sq img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}
.sq[data-file]::after,
.sq[data-rank]::after {
  position: absolute;
  font-size: 9px;
  line-height: 1;
  color: #2f4354;
  opacity: 0.75;
}
.sq[data-file]::after {
  content: attr(data-file);
  right: 2px;
  bottom: 2px;
}
.sq[data-rank]:not([data-file])::after {
  content: attr(data-rank);
  left: 2px;
  top: 2px;
}
.sq[data-rank][data-file]::after {
  content: attr(data-file);
}

/* Login */
.login {
  min-height: calc(100vh - 31px);
  display: grid;
  grid-template-columns: minmax(320px, 440px) 1fr;
}
.login-form {
  background: var(--surface);
  padding: 56px 44px;
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.login-form h1 {
  margin-bottom: 6px;
}
.login-form form {
  margin-top: 28px;
}
.login-form input {
  width: 100%;
}
.login-side {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
  gap: 18px;
}
.login-side .board {
  width: min(420px, 80vw);
}
.login-side p {
  font: 400 17px/1.5 var(--book);
  max-width: 44ch;
  text-align: center;
  color: var(--ink-2);
}
.login-side p b {
  color: var(--ink);
  font-weight: 600;
}

/* Upload */
.drop {
  border: 1.5px dashed #9fb0bd;
  border-radius: 6px;
  padding: 18px 20px;
  background: #f8fafb;
}
.status {
  font-size: 14px;
}
.dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ink-2);
  margin-right: 6px;
}
.dot.done {
  background: var(--keep);
}
.dot.run {
  background: #c98a00;
}

/* Progress */
.meter {
  height: 14px;
  background: var(--line-soft);
  border-radius: 7px;
  overflow: hidden;
}
.meter > i {
  display: block;
  height: 100%;
  background: var(--action);
  border-radius: 7px;
  transition: width 0.6s;
}
.big-count {
  font: 600 34px/1.1 var(--book);
}
.stages {
  list-style: none;
  margin: 0;
  padding: 0;
}
.stages li {
  display: grid;
  grid-template-columns: 44px 1fr auto;
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px solid var(--line-soft);
}
.stages li:last-child {
  border-bottom: 0;
}
.stages .mark {
  font-weight: 600;
  color: var(--ink-2);
}
.stages .is-done .mark {
  color: var(--keep);
}
.stages .is-now {
  font-weight: 600;
}
.stages .is-now .mark {
  color: #8a5d00;
}

/* Results */
.summary {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
  margin-bottom: 16px;
}
.summary > div {
  padding: 12px 20px;
  border-right: 1px solid var(--line-soft);
  flex: 1 1 150px;
}
.summary > div:last-child {
  border-right: 0;
}
.summary dt {
  font-size: 13px;
  color: var(--ink-2);
}
.summary dd {
  margin: 0;
  font: 600 24px/1.2 var(--book);
}
.summary dd small {
  font: 400 13px/1 var(--ui);
}
.summary > .answer {
  flex: 2 1 280px;
}
.summary .answer small {
  display: block;
  line-height: 1.4;
}
.summary .arrow {
  color: var(--ink-2);
  font-weight: 400;
  padding: 0 4px;
}

.workbench {
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr) 288px;
  gap: 12px;
  align-items: start;
}
.workbench.two {
  grid-template-columns: 340px minmax(0, 1fr);
  gap: 16px;
}
.chapters {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 6px;
  position: sticky;
  top: 12px;
}
.chapters h2 {
  font: 500 13px/1 var(--ui);
  color: var(--ink-2);
  padding: 8px 8px 6px;
}
.chapters a {
  display: block;
  padding: 8px;
  border-radius: 4px;
  text-decoration: none;
  color: var(--ink);
  font-size: 14px;
  line-height: 1.35;
}
.chapters a:hover {
  background: var(--paper);
}
.chapters a[aria-current="true"] {
  background: #e3ebf2;
}
.chapters a small {
  display: block;
  margin-top: 2px;
}
.cut {
  display: flex;
  height: 5px;
  border-radius: 3px;
  overflow: hidden;
  background: var(--trim-bg);
  margin-top: 5px;
}
.cut i {
  background: var(--keep);
}
.cut i + i {
  background: #d9b84a;
}

.tree-pane {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
  min-width: 0;
}
.tree-tools {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line-soft);
}
.chip {
  font: 500 13px/1 var(--ui);
  padding: 6px 10px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  cursor: pointer;
}
.chip[aria-pressed="true"] {
  background: var(--slate);
  border-color: var(--slate);
  color: #fff;
}
.chapter-head {
  padding: 14px 14px 10px;
}
.chapter-head .line {
  color: var(--ink-2);
  margin-top: 2px;
}
.tree th {
  font-size: 12.5px;
  font-weight: 500;
  color: var(--ink-2);
  text-align: left;
  padding: 6px 8px;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
  position: sticky;
  top: 0;
  background: var(--surface);
  z-index: 1;
}
.tree td {
  padding: 5px 5px;
  border-bottom: 1px solid var(--line-soft);
  vertical-align: middle;
  font-size: 14px;
}
.tree tbody tr {
  cursor: pointer;
}
.tree tbody tr:hover {
  background: #f6f8f9;
}
.tree tbody tr.selected {
  background: #e3ebf2;
}
.tree td.mv {
  padding-left: calc(var(--d) * var(--indent) + 14px);
  background-image: repeating-linear-gradient(
    to right,
    transparent 0 calc(var(--indent) - 1px),
    var(--line) calc(var(--indent) - 1px) var(--indent)
  );
  background-size: calc(var(--d) * var(--indent) + 3px) 100%;
  background-repeat: no-repeat;
  background-position: 3px 0;
  white-space: nowrap;
  box-shadow: inset 3px 0 0 var(--edge, transparent);
}
tr[data-label="KEEP"] .mv {
  --edge: var(--keep);
}
tr[data-label="OPTIONAL"] .mv {
  --edge: #d9b84a;
}
tr[data-label="TRIM"] .mv {
  --edge: #d6a9a5;
}
tr[data-label="ADDED"] .mv {
  --edge: var(--added);
}
.mv .opp {
  font: 600 15px/1.3 var(--book);
}
.mv .rep {
  font: 400 14px/1.3 var(--book);
  color: var(--ink-2);
  margin-left: 5px;
}
tr[data-label="TRIM"] .mv .opp,
tr[data-label="TRIM"] .mv .rep {
  color: #5f6b75;
}
tr[data-label="TRIM"] .mv .opp {
  text-decoration: line-through;
  text-decoration-color: #9aa5ad;
}
.tree tr.context {
  opacity: 0.55;
}
.tree .dec {
  white-space: nowrap;
}
.tree .dec .flag {
  margin-left: 4px;
}
.reach {
  display: grid;
  grid-template-columns: 36px 56px;
  gap: 4px;
  align-items: center;
  justify-content: end;
}
.reach i {
  display: block;
  height: 6px;
  border-radius: 3px;
  background: var(--sq-dark);
  min-width: 2px;
}
.ovr {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
}
.ovr button {
  font: 600 12px/1 var(--ui);
  width: 26px;
  height: 26px;
  border: 0;
  border-right: 1px solid var(--line);
  background: #fff;
  color: var(--ink-2);
  cursor: pointer;
}
.ovr button:last-child {
  border-right: 0;
}
.ovr button:hover {
  background: var(--paper);
  color: var(--ink);
}
.ovr button[aria-pressed="true"][data-set="KEEP"] {
  background: var(--keep);
  color: #fff;
}
.ovr button[aria-pressed="true"][data-set="OPTIONAL"] {
  background: #b8900f;
  color: #fff;
}
.ovr button[aria-pressed="true"][data-set="TRIM"] {
  background: var(--trim);
  color: #fff;
}
.sample-note {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--ink-2);
}

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 14px;
  position: sticky;
  top: 12px;
  max-height: calc(100vh - 24px);
  overflow: auto;
  scrollbar-gutter: stable;
}
.steps {
  display: flex;
  gap: 6px;
  margin: 8px 0 4px;
}
.steps .btn {
  flex: 1;
  font-size: 17px;
  line-height: 1;
}
.steps .btn[aria-disabled="true"] {
  opacity: 0.4;
  cursor: default;
}
.step-at {
  font-size: 13px;
  color: var(--ink-2);
  text-align: center;
  margin-bottom: 8px;
}
.moves {
  font: 400 14px/1.7 var(--book);
}
.moves button {
  font: inherit;
  color: var(--ink-2);
  background: none;
  border: 0;
  border-radius: 3px;
  padding: 1px 3px;
  cursor: pointer;
}
.moves button:hover {
  background: var(--line-soft);
  color: var(--ink);
}
.moves button[aria-current="true"] {
  background: var(--slate);
  color: #fff;
}
.panel .full-line {
  font: 400 14px/1.5 var(--book);
  color: var(--ink-2);
  margin-bottom: 10px;
}
.panel .verdict {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 8px;
}
.panel .why {
  margin-bottom: 12px;
}
.facts {
  width: 100%;
  font-size: 14px;
}
.facts th {
  text-align: left;
  font-weight: 400;
  color: var(--ink-2);
  padding: 3px 0;
}
.facts td {
  text-align: right;
  padding: 3px 0;
}
.panel .your-call {
  border-top: 1px solid var(--line-soft);
  margin-top: 12px;
  padding-top: 12px;
}
.panel .your-call h3 {
  margin-bottom: 8px;
}
.replies {
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
  font-size: 14px;
}
.replies li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2px 10px;
  padding: 5px 0;
  border-top: 1px solid var(--line-soft);
}
.replies b {
  font: 600 15px/1.3 var(--book);
}
.replies .sc {
  text-align: right;
}
.replies .pv {
  grid-column: 1 / -1;
  font-family: var(--book);
  color: var(--ink-2);
}

/* Common mistakes: each move is a closed row, open it for the board and the numbers */
.mistake {
  padding: 10px 16px;
}
#mistake-list > * + * {
  margin-top: 6px;
}
.mistake-sum {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  align-items: center;
  font-weight: 400;
  list-style: none;
}
.mistake-sum::-webkit-details-marker {
  display: none;
}
.mistake-sum::before {
  content: "\25B8";
  color: var(--ink-2);
  width: 14px;
}
details[open] > .mistake-sum::before {
  content: "\25BE";
}
details[open] > .mistake-sum {
  margin-bottom: 16px;
}
.card > details.key {
  margin-top: 10px;
}
.mistake-sum .mistake-move {
  flex: 0 0 170px;
  display: inline-flex;
  gap: 6px;
  align-items: center;
}
.mistake-sum .mistake-move b {
  font: 600 17px/1.3 var(--book);
}
.mistake-sum .mistake-where {
  flex: 1 1 200px;
  font-size: 14px;
}
.mistake-sum .mistake-num {
  flex: 0 0 110px;
  text-align: right;
  font-size: 14px;
  white-space: nowrap;
}
.mistake-body {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr) minmax(240px, 320px);
  gap: 20px;
}
.mistake .where {
  color: var(--ink-2);
  font-size: 14px;
}
.kv {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 10px 18px;
  margin: 12px 0;
}
.kv dt {
  font-size: 13px;
  color: var(--ink-2);
}
.kv dd {
  margin: 0;
  font: 600 19px/1.2 var(--book);
}
.kv dd small {
  font: 400 13px/1.2 var(--ui);
  display: block;
}
.sev {
  font: 600 12px/1 var(--ui);
  padding: 4px 7px;
  border-radius: 3px;
}
.sev.Blunder {
  background: #f6dada;
  color: #9c2020;
}
.sev.Mistake {
  background: #fbe6d0;
  color: #8f4a00;
}
.sev.Inaccuracy {
  background: #f6efc8;
  color: #6b5800;
}

/* Bars in stats and report */
.hbar {
  display: flex;
  height: 12px;
  border-radius: 3px;
  overflow: hidden;
  background: var(--trim-bg);
  min-width: 120px;
}
.hbar i {
  background: var(--keep);
}
.hbar i + i {
  background: #d9b84a;
}
.legend {
  display: flex;
  gap: 16px;
  font-size: 13px;
  color: var(--ink-2);
  flex-wrap: wrap;
}
.legend i {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  margin-right: 5px;
}
.tiles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 0;
}
.tiles > div {
  padding: 4px 18px 4px 0;
}
.tiles dt {
  font-size: 13px;
  color: var(--ink-2);
}
.tiles dd {
  margin: 0;
  font: 600 24px/1.25 var(--book);
}

@media (max-width: 1180px) {
  .workbench {
    grid-template-columns: 200px minmax(0, 1fr);
  }
  .workbench .panel {
    grid-column: 1 / -1;
    grid-row: 1;
    position: static;
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 16px;
  }
  .mistake-body {
    grid-template-columns: 180px minmax(0, 1fr);
  }
  .mistake .answers {
    grid-column: 1 / -1;
  }
}
@media (max-width: 760px) {
  main {
    padding: 16px 12px 48px;
  }
  .mock-note,
  .top {
    padding-left: 12px;
    padding-right: 12px;
  }
  .top {
    gap: 8px 16px;
    padding-top: 8px;
  }
  .top nav {
    order: 3;
    flex-basis: 100%;
  }
  .top nav a {
    padding: 8px 10px;
  }
  .login {
    grid-template-columns: 1fr;
  }
  .login-form {
    padding: 32px 20px;
    border-right: 0;
  }
  .workbench,
  .workbench.two {
    grid-template-columns: minmax(0, 1fr);
  }
  .chapters,
  .workbench .panel {
    position: static;
    display: block;
    grid-column: auto;
    grid-row: auto;
  }
  .tree-pane {
    overflow-x: auto;
  }
  .mistake-body {
    grid-template-columns: 1fr;
  }
  .mistake-sum .mistake-num {
    flex-basis: auto;
    text-align: left;
  }
  .mistake .board {
    max-width: 260px;
  }
  h1 {
    font-size: 23px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .meter > i {
    transition: none;
  }
}
@media print {
  .mock-note,
  .top,
  .tabs,
  .no-print {
    display: none;
  }
  body {
    background: #fff;
  }
  .card {
    border: 0;
    padding: 0;
  }
}
#bands span {
  padding: 7px 8px;
  font-size: 13px;
}

/* Shared helpers and states */
.vh {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}
.error {
  color: var(--trim);
  font-weight: 600;
  margin-top: 8px;
}
.callout:empty {
  display: none;
}
main.login {
  max-width: none;
  margin: 0;
  padding: 0;
}
.top a:focus-visible {
  outline-color: #fff;
}
.ovr button:focus-visible {
  outline-offset: -2px;
}
.btn.danger {
  border-color: var(--trim);
  color: var(--trim);
}
.key {
  font-size: 13px;
  color: var(--ink-2);
}
.tree-pane .key {
  padding: 0 14px 8px;
}
.next-steps {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  align-items: center;
  margin: 10px 0 14px;
}

/* Results tree: branches open and close, the buttons show on the selected row */
.tools-right {
  margin-left: auto;
  display: flex;
  gap: 8px;
}
.chip:disabled {
  opacity: 0.5;
  cursor: default;
}
.twist {
  width: 22px;
  height: 22px;
  margin-right: 2px;
  padding: 0;
  border: 0;
  border-radius: 4px;
  background: none;
  color: var(--ink-2);
  cursor: pointer;
  font-size: 12px;
  vertical-align: middle;
}
.twist::before {
  content: "\25B8";
}
.twist[aria-expanded="true"]::before {
  content: "\25BE";
}
.twist:hover {
  background: var(--line-soft);
  color: var(--ink);
}
.twist:disabled {
  visibility: hidden;
}
.inside {
  margin-left: 10px;
  font: 400 12.5px/1 var(--ui);
  color: var(--ink-2);
}
.tree tr:not(.selected) .ovr {
  visibility: hidden;
}
.tree td.call {
  width: 90px;
}
details.key > summary {
  cursor: pointer;
  color: var(--action);
  padding-top: 8px;
}
details.key > p {
  margin-top: 6px;
  max-width: 80ch;
}

/* Results on a phone: each move is a small card, the selected line stays at the bottom */
@media (max-width: 760px) {
  .tree,
  .tree tbody {
    display: block;
  }
  .tree thead {
    display: none;
  }
  .tree tr[data-id] {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto auto;
    gap: 3px 10px;
    align-items: center;
    padding: 7px 8px 7px 0;
    border-bottom: 1px solid var(--line-soft);
  }
  .tree tr[data-id] > td {
    border: 0;
    padding: 0;
    width: auto;
  }
  .tree tr[data-id] > td.mv {
    --indent: 7px;
    grid-column: 1 / -1;
    white-space: normal;
    padding-left: calc(var(--d) * var(--indent) + 8px);
  }
  .tree tr[data-id] > td.dec {
    white-space: normal;
    padding-left: 12px;
  }
  .tree tr[data-id] > td.num {
    font-size: 13px;
  }
  .tree td.num::before {
    content: attr(data-h) " ";
    color: var(--ink-2);
  }
  .twist {
    width: 30px;
    height: 30px;
  }
  .ovr button {
    width: 34px;
    height: 34px;
  }
  .tools-right {
    margin-left: 0;
  }
  .workbench .panel {
    position: sticky;
    bottom: 0;
    z-index: 2;
    max-height: 44vh;
    overflow: auto;
    display: grid;
    grid-template-columns: 112px minmax(0, 1fr);
    gap: 10px;
    border-radius: 6px 6px 0 0;
    box-shadow: 0 -4px 14px rgba(36, 56, 75, 0.18);
  }
  .panel .steps {
    gap: 3px;
  }
  .panel .steps .btn {
    padding-left: 0;
    padding-right: 0;
    min-width: 0;
  }
}