:root {
  color-scheme: light;
  --paper: #f7f6ef;
  --surface: #fffefa;
  --ink: #1b3129;
  --muted: #53645c;
  --forest: #16372d;
  --forest-hover: #254b3e;
  --line: #dddfd5;
  --sage: #e3eee3;
  --amber: #e5ad61;
  --sand: #f6ecd9;
  --blue: #e5ecf2;
  --rose: #f4e8e3;
  --danger: #963b2c;
  --radius: 18px;
  --serif: Georgia, "Times New Roman", serif;
  --sans: Inter, "Segoe UI", system-ui, sans-serif;
  --ease: cubic-bezier(.2, .7, .24, 1);
  --sidebar-width: 234px;
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }

html {
  scroll-behavior: smooth;
  scroll-padding-block-start: 1.5rem;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.55;
}

a { color: inherit; }
img { display: block; max-inline-size: 100%; }
svg { flex: none; vertical-align: middle; }
button, input, textarea, select { font: inherit; }
button { color: inherit; cursor: pointer; }
button:disabled { cursor: default; opacity: .57; }
::selection { color: var(--forest); background: #efcf93; }

:focus-visible {
  outline: 3px solid #a56824;
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 30;
  inset-block-start: 10px;
  inset-inline-start: 12px;
  padding: 8px 12px;
  border-radius: 8px;
  background: var(--surface);
  color: var(--forest);
  font-weight: 700;
  transform: translateY(calc(-100% - 16px));
}

.skip-link:focus { transform: translateY(0); }

h1, h2, h3, h4, p { margin: 0; }
h1, h2 { text-wrap: balance; }
h1, h2, h3 { line-height: 1.18; }

.shell {
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  min-block-size: 100vh;
}

.sidebar {
  position: sticky;
  inset-block-start: 0;
  display: flex;
  flex-direction: column;
  align-self: start;
  block-size: 100vh;
  block-size: 100dvh;
  padding: 32px 19px 21px;
  background: #eeefe6;
  border-inline-end: 1px solid #e0e3d8;
  overflow: auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  min-block-size: 45px;
  padding-inline: 5px;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  flex: 0 0 39px;
  block-size: 39px;
  place-items: center;
  border-radius: 11px;
  background: var(--forest);
  color: #f8f3e5;
}

.brand-mark svg { inline-size: 20px; block-size: 20px; }

.brand-copy { display: grid; gap: 1px; }
.brand-copy strong {
  font-family: var(--serif);
  font-size: 1.06rem;
  letter-spacing: -.035em;
  line-height: 1.25;
}

.brand-copy small {
  color: var(--muted);
  font-size: .69rem;
  font-weight: 680;
  letter-spacing: .065em;
}

.nav {
  display: grid;
  gap: 5px;
  margin-block-start: 44px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 11px;
  inline-size: 100%;
  min-block-size: 46px;
  padding: 8px 12px;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: var(--muted);
  text-align: start;
  text-decoration: none;
  font-size: .89rem;
  font-weight: 620;
  transition: color .18s, background-color .18s, transform .22s var(--ease);
}

.nav-link svg { inline-size: 18px; block-size: 18px; }
.nav-link:hover { color: var(--forest); background: #e3e8dc; }
.nav-link:active { transform: translateY(1px); }
.nav-link:is(.active, .is-active, [aria-current="page"], [aria-selected="true"]) {
  background: #dce8da;
  color: var(--forest);
  font-weight: 700;
}

.sidebar-bottom {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-block-start: auto;
  padding: 17px 5px 0;
  border-block-start: 1px solid #daddd2;
  color: var(--muted);
  font-size: .74rem;
}

.sidebar-bottom svg { inline-size: 15px; block-size: 15px; color: #4d755e; }
.workspace { min-inline-size: 0; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  max-inline-size: 1228px;
  min-block-size: 74px;
  margin-inline: auto;
  padding-inline: clamp(22px, 4vw, 52px);
  color: var(--muted);
  font-size: .82rem;
}

.breadcrumb, .top-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumb strong { color: var(--forest); font-weight: 660; }
.breadcrumb svg, .top-meta svg { inline-size: 14px; block-size: 14px; }

.language-switch {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 2px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: #eeefe7;
}

.language-switch :is(button, a) {
  display: inline-grid;
  min-inline-size: 32px;
  min-block-size: 27px;
  place-items: center;
  padding: 2px 5px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  font-size: .72rem;
  font-weight: 740;
  text-decoration: none;
  transition: background-color .2s, color .2s, box-shadow .2s;
}

.language-switch :is(button, a):hover { color: var(--forest); }
.language-switch :is(button, a):is(.active, .is-active, [aria-pressed="true"], [aria-current="true"]) {
  background: var(--surface);
  color: var(--forest);
  box-shadow: 0 1px 2px #16372d24;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  max-inline-size: 100%;
  min-block-size: 28px;
  padding: 3px 10px;
  border: 1px solid #dce5d9;
  border-radius: 999px;
  background: #edf2e8;
  color: #365647;
  font-size: .75rem;
  font-weight: 650;
}

.page {
  inline-size: 100%;
  max-inline-size: 1228px;
  min-block-size: calc(100vh - 144px);
  margin-inline: auto;
  padding: 0 clamp(22px, 4vw, 52px) 28px;
}

.page:focus { outline-offset: -4px; }
.page-enter { animation: page-enter .34s var(--ease) both; }
@keyframes page-enter {
  from { opacity: 0; transform: translateY(7px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.34fr) minmax(0, 1fr);
  min-block-size: 368px;
  overflow: hidden;
  isolation: isolate;
  border-radius: 23px;
  background: var(--forest);
  color: #fffaf0;
}

.hero-copy {
  align-self: center;
  min-inline-size: 0;
  padding: clamp(27px, 4.2vw, 58px);
}

.eyebrow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-block-end: 14px;
  color: #536e5e;
  font-size: .72rem;
  font-weight: 760;
  letter-spacing: .13em;
  line-height: 1.5;
  text-transform: uppercase;
}

.hero .eyebrow { color: #efc48b; }
.eyebrow svg { inline-size: 15px; block-size: 15px; }

.hero h1, .view-head h1 {
  font-family: var(--serif);
  font-weight: 500;
  letter-spacing: -.053em;
  overflow-wrap: break-word;
}

.hero h1 {
  max-inline-size: 13ch;
  font-size: clamp(2.65rem, 4.9vw, 4.75rem);
  line-height: 1.035;
}

.hero h1 em { color: #efc48b; font-weight: inherit; }

.hero-copy > p:not(.eyebrow) {
  max-inline-size: 44ch;
  margin-block: 16px 24px;
  color: #dbe6d9;
  font-size: .98rem;
  line-height: 1.55;
}

.hero .pill {
  border-color: #8ca193;
  background: #ffffff0c;
  color: #f2f3e6;
}

.hero-image {
  position: relative;
  min-inline-size: 0;
  min-block-size: 100%;
  overflow: hidden;
  background: #d1bd96;
}

.hero-image img {
  position: absolute;
  inset: 0;
  inline-size: 100%;
  block-size: 100%;
  object-fit: cover;
  object-position: 53% 52%;
}

.hero-image figcaption {
  position: absolute;
  inset-inline: 16px;
  inset-block-end: 16px;
  inline-size: fit-content;
  max-inline-size: calc(100% - 32px);
  padding: 5px 10px;
  border-radius: 8px;
  background: #f7f2e6;
  color: var(--forest);
  font-size: .75rem;
  font-weight: 640;
}

figure.hero-image { margin: 0; }
.hero a:focus-visible, .hero button:focus-visible { outline-color: #f0c587; }

.btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  min-block-size: 43px;
  max-inline-size: 100%;
  padding: 9px 15px;
  border: 1px solid transparent;
  border-radius: 10px;
  font-size: .875rem;
  font-weight: 670;
  line-height: 1.35;
  text-align: center;
  text-decoration: none;
  transition: background-color .2s, color .2s, border-color .2s, transform .2s var(--ease);
}

.btn:not(:disabled):active { transform: translateY(1px); }
.btn svg { inline-size: 17px; block-size: 17px; }
.btn-primary { background: var(--forest); color: #fffaf0; }
.btn-primary:hover:not(:disabled) { background: var(--forest-hover); }
.btn-light { background: #f8f2e1; color: var(--forest); }
.btn-light:hover:not(:disabled) { background: #f1d8a8; }
.btn-ghost { border-color: var(--line); background: var(--surface); color: var(--forest); }
.btn-ghost:hover:not(:disabled) { border-color: #aac0af; background: #edf2e8; }
.btn-icon { min-inline-size: 43px; padding-inline: 10px; }

.home-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(252px, .48fr);
  align-items: start;
  gap: clamp(18px, 2.7vw, 34px);
  margin-block-start: 33px;
}

.section-head, .card-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 15px;
}

.section-head { margin-block-end: 15px; }
.section-head h2, .panel > h2 {
  color: var(--forest);
  font-family: var(--serif);
  font-size: clamp(1.45rem, 2.3vw, 2rem);
  font-weight: 500;
  letter-spacing: -.04em;
}

.tile-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.tile {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-content: start;
  gap: 12px 6px;
  min-block-size: 150px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  color: var(--forest);
  text-align: start;
  text-decoration: none;
  transition: transform .26s var(--ease), border-color .26s, box-shadow .26s;
}

.tile:hover {
  transform: translateY(-3px);
  border-color: #a6bca9;
  box-shadow: 0 9px 20px #16372d0c;
}

.tile:active { transform: translateY(-1px); }

.tile-icon {
  display: grid;
  inline-size: 39px;
  block-size: 39px;
  place-items: center;
  border-radius: 10px;
  background: var(--sage);
  color: #305943;
}

.tile-icon.sand { background: var(--sand); color: #775428; }
.tile-icon.blue { background: var(--blue); color: #3b5870; }
.tile-icon.rose { background: var(--rose); color: #7d4c40; }
.tile-icon svg { inline-size: 20px; block-size: 20px; }
.tile-arrow {
  grid-column: 2;
  grid-row: 1;
  margin-block-start: 4px;
  color: #597567;
  transition: transform .25s var(--ease);
}

.tile:hover .tile-arrow { transform: translate(3px, -2px); }
.tile-copy { grid-column: 1 / -1; min-inline-size: 0; }
.tile-copy h3, .tile-copy strong { display: block; font-size: 1rem; font-weight: 710; }
.tile-copy p, .tile-copy small { display: block; margin-block-start: 4px; color: var(--muted); font-size: .81rem; }

.panel {
  min-inline-size: 0;
  padding: clamp(16px, 2.2vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.panel > * + * { margin-block-start: 14px; }
.panel h3 { color: var(--forest); font-size: 1.05rem; }
.panel p { overflow-wrap: anywhere; }
.plan { background: #f1f3ea; }
.plan ol, .plan ul { padding: 0; list-style: none; }
.plan .progress-row { margin-block-start: 5px; }
.plan .progress-track { margin-block-start: 7px; margin-block-end: 12px; }

.plan-item {
  display: flex;
  align-items: center;
  gap: 9px;
  min-block-size: 47px;
  padding: 7px 0;
  color: var(--forest);
  font-size: .84rem;
  text-decoration: none;
}

.plan-item + .plan-item { border-block-start: 1px solid #dfe5d9; }
button.plan-item { inline-size: 100%; margin-block-start: 0; border-inline: 0; border-block-end: 0; background: transparent; text-align: start; }
button.plan-item:first-of-type { border-block-start: 0; }
:is(a, button).plan-item:hover { color: #4a705a; }
.plan-item small { color: var(--muted); }
.plan-item > svg:last-child { inline-size: 15px; block-size: 15px; margin-inline-start: auto; }
.plan-num {
  display: grid;
  flex: 0 0 28px;
  min-block-size: 28px;
  place-items: center;
  border-radius: 8px;
  background: #e2eadc;
  color: #3b624c;
  font-weight: 720;
}

.plan-num svg { inline-size: 15px; block-size: 15px; }
.progress-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 5px 12px;
  color: var(--muted);
  font-size: .76rem;
}

.progress-track {
  block-size: 7px;
  overflow: hidden;
  border-radius: 20px;
  background: #dfe7da;
}

.progress-fill {
  display: block;
  block-size: 100%;
  max-inline-size: 100%;
  border-radius: inherit;
  background: #4b765a;
  transform-origin: left center;
  transition: width .45s var(--ease);
  animation: progress-reveal .52s var(--ease) both;
}

[dir="rtl"] .progress-fill { transform-origin: right center; }
@keyframes progress-reveal { from { transform: scaleX(0); } to { transform: scaleX(1); } }

.view-head { margin-block: 12px 25px; }
.view-head h1 { color: var(--forest); font-size: clamp(2.35rem, 4.7vw, 4.15rem); }
.lead {
  max-inline-size: 67ch;
  margin-block-start: 10px;
  color: var(--muted);
  font-size: 1rem;
}

.columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: start;
  gap: 20px;
}

.stack { display: grid; align-content: start; gap: 14px; min-inline-size: 0; }
.stack > * { min-inline-size: 0; }
.stack > * + * { margin-block-start: 0; }
.card-head { align-items: center; }

.section-title {
  color: var(--forest);
  font-family: var(--serif);
  font-size: clamp(1.45rem, 2.3vw, 2rem);
  font-weight: 500;
  letter-spacing: -.04em;
}

.tabs, .toolbar, .flash-controls, .page-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.tabs { margin-block-end: 16px; }
.tab, .quiz-option {
  min-block-size: 43px;
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  color: var(--forest);
  font-size: .875rem;
  font-weight: 640;
  transition: background-color .2s, border-color .2s, color .2s;
}

.tab:hover, .quiz-option:hover:not(:disabled) { border-color: #adc1b0; background: #edf2e8; }
.tab:is(.active, .is-active, [aria-selected="true"], [aria-pressed="true"]) {
  border-color: var(--forest);
  background: var(--forest);
  color: #fffaf0;
}

.topic-picker, .field {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
}

.topic-picker { margin-block-end: 16px; }
.toolbar .topic-picker { margin-block-end: 0; }
.field { align-items: flex-start; flex-direction: column; }
.field > :is(input, textarea, select) { inline-size: 100%; }
.label, .mini-label, .field > :is(label, span), .topic-picker > :is(label, span) {
  color: var(--forest);
  font-size: .83rem;
  font-weight: 710;
}

.mini-label { font-size: .74rem; }

select, input:not([type="checkbox"], [type="radio"]), textarea {
  max-inline-size: 100%;
  border: 1px solid #c4cfc2;
  border-radius: 10px;
  background: #fffefa;
  color: var(--ink);
}

select, input:not([type="checkbox"], [type="radio"]) { min-block-size: 43px; padding: 7px 10px; }
textarea {
  display: block;
  inline-size: 100%;
  min-block-size: 126px;
  padding: 11px 13px;
  line-height: 1.55;
  resize: vertical;
}

.editor { min-block-size: 265px; }

.callout, .feedback, .empty {
  padding: 13px 15px;
  border: 1px solid #d8e3d6;
  border-radius: 11px;
  background: #eef3e9;
  color: var(--forest);
  font-size: .88rem;
}

.callout > * + *, .feedback > * + *, .empty > * + * { margin-block-start: 7px; }
.callout a, .feedback a, .site-footer a { text-underline-offset: 3px; }
.feedback:is(.error, .incorrect, [data-state="incorrect"]) {
  border-color: #e6c8bc;
  background: #faefe9;
  color: #763f31;
}

.source-text, .example-text {
  margin-inline: 0;
  padding: 15px 17px;
  border-inline-start: 3px solid #a9bda5;
  border-radius: 0 9px 9px 0;
  background: #f1f2e9;
  color: #294137;
  font-size: .95rem;
  line-height: 1.64;
  white-space: pre-wrap;
}

.source-text > * + *, .example-text > * + * { margin-block-start: 9px; }

.step-list, .checklist, .task-list {
  display: grid;
  gap: 9px;
  padding-inline-start: 20px;
}

.task-list { font-size: .9rem; }

.step { padding-inline-start: 3px; }
.step::marker { color: #41694f; font-weight: 700; }
.step > * + * { margin-block-start: 8px; }
.subtle { color: var(--muted); font-size: .82rem; }
.phrase {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px 12px;
  margin-block: 0;
  padding: 8px 11px;
  border: 1px solid #dfe6da;
  border-radius: 8px;
  background: #f0f3eb;
  color: var(--forest);
  font-size: .86rem;
}

button.phrase:hover { background: #e4ede2; }
.phrase > div { flex: 1 1 150px; min-inline-size: 0; }
.phrase :is(small, p) { display: block; margin-block-start: 3px; color: var(--muted); }
.phrase p { font-size: .82rem; }

.card-list {
  display: grid;
  gap: 10px;
}

.grammar-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 255px), 1fr));
  gap: 14px;
}

.grammar-card {
  display: grid;
  align-content: start;
  gap: 9px;
  min-inline-size: 0;
  padding: 17px;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: var(--surface);
}

.grammar-card > * { margin-block: 0; }
.grammar-card h3 { color: var(--forest); font-size: 1rem; }
.compare {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr));
  gap: 10px;
}

.compare > * {
  min-inline-size: 0;
  margin-block: 0;
  padding: 8px 10px;
  border-radius: 7px;
  background: #f1f2e9;
}

.compare > :nth-child(2) { background: #e7efe2; }

details { border-block-start: 1px solid var(--line); }
details > summary {
  padding-block: 11px;
  color: var(--forest);
  cursor: pointer;
  font-size: .9rem;
  font-weight: 680;
}

details[open] > summary { margin-block-end: 4px; }
details > :last-child:not(summary) { margin-block-end: 10px; }

.flip-card {
  display: block;
  inline-size: 100%;
  padding: 0;
  border: 0;
  border-radius: 16px;
  background: transparent;
  text-align: center;
  perspective: 1100px;
}

.flip-inner {
  display: grid;
  min-block-size: 232px;
  border-radius: inherit;
  transform-style: preserve-3d;
  transition: transform .52s var(--ease);
}

.flip-face {
  display: grid;
  grid-area: 1 / 1;
  align-content: center;
  justify-items: center;
  min-inline-size: 0;
  gap: 8px;
  padding: 20px;
  border: 1px solid #dce6d9;
  border-radius: inherit;
  backface-visibility: hidden;
  background: #edf3e9;
  color: var(--forest);
  overflow-wrap: anywhere;
}

.flip-face :is(h2, h3, strong) { font-family: var(--serif); font-size: clamp(1.5rem, 3.1vw, 2.35rem); font-weight: 500; }
.flip-back { transform: rotateY(180deg); background: #f7eee0; border-color: #e9dbc4; }
.flip-card:is(.flipped, .is-flipped, [aria-pressed="true"]) .flip-inner,
.flip-inner:is(.flipped, .is-flipped) { transform: rotateY(180deg); }
.flash-controls { justify-content: center; }
.quiz-options { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 150px), 1fr)); gap: 8px; }
.quiz-option svg { inline-size: 16px; block-size: 16px; margin-inline-start: 5px; }
.quiz-option:disabled { opacity: 1; }
.quiz-option:is(.selected, .is-selected, [aria-pressed="true"]) { border-color: #6f9078; background: #e1eddf; }
.quiz-option:is(.correct, [data-state="correct"]) {
  border-color: #6f9078;
  background: #e1eddf;
  color: #27513b;
  animation: answer-correct .44s var(--ease);
}

@keyframes answer-correct {
  0% { box-shadow: 0 0 0 0 #57956f6e; transform: scale(.985); }
  45% { transform: scale(1.025); }
  100% { box-shadow: 0 0 0 7px #57956f00; transform: scale(1); }
}

.quiz-option:is(.incorrect, [data-state="incorrect"]) { border-color: #c4887b; background: #faebe5; color: #763f31; }
.checklist label { cursor: pointer; }
.checklist input { margin-inline-end: 6px; accent-color: var(--forest); }

.timer {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px;
  min-block-size: 38px;
  padding: 5px 11px;
  border: 1px solid #e6d4b2;
  border-radius: 10px;
  background: #f8edd9;
  color: #654b28;
  font-size: .92rem;
  font-variant-numeric: tabular-nums;
  font-weight: 710;
}

.timer svg { inline-size: 17px; block-size: 17px; }

.status-dot {
  display: inline-block;
  flex: none;
  inline-size: 7px;
  block-size: 7px;
  border-radius: 50%;
  background: #598263;
}

.finish-result {
  padding: 15px;
  border: 1px solid #d6e3d4;
  border-radius: 12px;
  background: #edf3e9;
  color: var(--forest);
}

.finish-result > * + * { margin-block-start: 9px; }

.success-toast {
  position: fixed;
  z-index: 25;
  inset-inline-end: max(20px, env(safe-area-inset-right));
  inset-block-end: max(20px, env(safe-area-inset-bottom));
  display: flex;
  align-items: center;
  gap: 9px;
  max-inline-size: min(390px, calc(100% - 40px));
  padding: 11px 15px;
  border: 1px solid #91b096;
  border-radius: 12px;
  background: var(--forest);
  color: #f7f8ed;
  box-shadow: 0 5px 22px #16372d2c;
  font-size: .86rem;
  font-weight: 650;
  pointer-events: none;
}

.success-toast:not(:empty) { animation: page-enter .26s var(--ease) both; }
.success-toast:empty {
  padding: 0;
  border: 0;
  clip-path: inset(50%);
}
.success-toast svg { inline-size: 17px; block-size: 17px; color: #b5dabd; }
.score-grid, .board-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 150px), 1fr));
  gap: 10px;
}

.score-card, .board-item {
  display: grid;
  align-content: start;
  gap: 6px;
  min-inline-size: 0;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: var(--surface);
  color: var(--forest);
  font-size: .83rem;
}

.board-item:is(button, a) {
  text-align: start;
  text-decoration: none;
  transition: background-color .2s, border-color .2s;
}

.board-item:is(button, a):hover { border-color: #a6bca9; background: #eef3e9; }
.score-num {
  color: var(--forest);
  font-family: var(--serif);
  font-size: 1.6rem;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.marker, .result-text mark {
  padding: 1px 3px;
  border-radius: 3px;
  background: #f7e5bd;
  color: #61451d;
}

.marker:is(.error, .incorrect), .result-text mark:is(.error, .incorrect) {
  background: #f7dcd2;
  color: #753d31;
}

.error-list, .criterion-list, .signal-list {
  display: grid;
  gap: 8px;
  padding-inline-start: 19px;
  font-size: .87rem;
}

.error-list li::marker { color: var(--danger); }
.signal-list li::marker { color: #466c55; }
.criterion-list { padding-inline-start: 0; list-style: none; }
.criterion-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 6px 12px;
  padding-block: 5px;
  border-block-end: 1px solid var(--line);
}

.criterion-list strong { white-space: nowrap; font-variant-numeric: tabular-nums; }
.result-text {
  padding: 13px 15px;
  border-radius: 10px;
  background: #f3f2e9;
  font-size: .9rem;
  overflow-wrap: anywhere;
  white-space: pre-wrap;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 999px;
  background: #e8eee3;
  color: #3c624b;
  font-size: .71rem;
  font-weight: 700;
}

.step-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0;
  list-style: none;
}

.step-nav + .columns { margin-block-start: 3px; }

.step-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-block-size: 40px;
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface);
  color: var(--forest);
  font-size: .8rem;
  font-weight: 670;
  text-decoration: none;
  transition: background-color .2s, border-color .2s;
}

.step-link:hover { border-color: #a6bca9; background: #eef3e9; }
.step-link:is(.active, .is-active, [aria-current="step"], [aria-pressed="true"]) {
  border-color: #a1b8a0;
  background: #e0ecdf;
}

.step-link svg { inline-size: 15px; block-size: 15px; }

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 14px;
  max-inline-size: 1228px;
  margin-inline: auto;
  padding: 14px clamp(22px, 4vw, 52px) 22px;
  color: var(--muted);
  font-size: .75rem;
}

@media (max-width: 1050px) {
  :root { --sidebar-width: 205px; }
  .sidebar { padding-inline: 14px; }
  .hero { min-block-size: 332px; }
  .hero-copy { padding-inline: 31px; }
  .home-grid { grid-template-columns: minmax(0, 1fr) minmax(213px, .55fr); gap: 16px; }
}

@media (max-width: 850px) {
  :root { --mobile-nav-height: 61px; }
  html { scroll-padding-block-end: calc(var(--mobile-nav-height) + env(safe-area-inset-bottom) + 12px); }
  .shell { display: block; }
  .sidebar {
    position: static;
    block-size: auto;
    padding: 10px clamp(15px, 3vw, 23px);
    border-inline-end: 0;
    border-block-end: 1px solid #dce2d7;
    overflow: visible;
  }
  .brand { min-block-size: 34px; padding-inline: 2px; }
  .brand-mark { flex-basis: 33px; block-size: 33px; border-radius: 8px; }
  .brand-mark svg { inline-size: 17px; block-size: 17px; }
  .nav {
    position: fixed;
    z-index: 20;
    inset-inline: 0;
    inset-block-end: 0;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 3px;
    min-block-size: var(--mobile-nav-height);
    margin: 0;
    padding: 4px max(10px, env(safe-area-inset-right)) calc(4px + env(safe-area-inset-bottom)) max(10px, env(safe-area-inset-left));
    border-block-start: 1px solid #dce2d7;
    background: #f2f3ea;
    box-shadow: 0 -5px 16px #16372d09;
  }
  .nav-link {
    flex-direction: column;
    justify-content: center;
    gap: 3px;
    min-block-size: 51px;
    padding: 4px 2px;
    font-size: .76rem;
    line-height: 1.2;
    text-align: center;
  }
  .nav-link svg { inline-size: 18px; block-size: 18px; }
  .sidebar-bottom { display: none; }
  .workspace { padding-block-end: calc(var(--mobile-nav-height) + env(safe-area-inset-bottom)); }
  .topbar { min-block-size: 48px; }
  .success-toast { inset-block-end: calc(var(--mobile-nav-height) + env(safe-area-inset-bottom) + 12px); }
  .hero { min-block-size: 335px; }
  .hero h1 { font-size: clamp(2.65rem, 6.7vw, 4.4rem); }
  .home-grid { margin-block-start: 26px; }
}

@media (max-width: 570px) {
  .topbar, .page, .site-footer { padding-inline: 15px; }
  .topbar { min-block-size: 48px; }
  .top-meta { gap: 4px; }
  .hero { grid-template-columns: minmax(0, 1fr); border-radius: 17px; }
  .hero-copy { padding: 26px 22px; }
  .hero-image { min-block-size: 175px; }
  .hero-image img { object-position: 50% 57%; }
  .hero h1 { max-inline-size: 15ch; font-size: clamp(2.4rem, 8.7vw, 3.45rem); }
  .hero-copy > p:not(.eyebrow) { margin-block: 13px 17px; }
  .home-grid, .columns { grid-template-columns: minmax(0, 1fr); gap: 17px; }
  .view-head { margin-block: 8px 19px; }
  .view-head .eyebrow { margin-block-end: 8px; }
  .view-head h1 { font-size: clamp(1.9rem, 8.1vw, 2.65rem); }
  .view-head .lead { margin-block-start: 8px; font-size: .91rem; }
  .step-nav { gap: 5px; }
  .step-link { min-block-size: 39px; padding-inline: 7px; font-size: .76rem; }
  .editor { min-block-size: 170px; }
  .tile-grid { gap: 8px; }
  .tile { min-block-size: 135px; padding: 11px; }
  .tile-copy h3, .tile-copy strong { font-size: .94rem; overflow-wrap: anywhere; }
  .tile-copy p, .tile-copy small { font-size: .76rem; }
  .panel { border-radius: 14px; }
}

@media (max-width: 365px) {
  .nav-link { font-size: .72rem; }
  .topbar { gap: 5px; }
  .breadcrumb { gap: 4px; font-size: .75rem; }
  .top-meta .pill { padding-inline: 6px; }
  .language-switch :is(button, a) { min-inline-size: 25px; }
}

@media (hover: none) {
  .tile:hover, .tile:hover .tile-arrow { transform: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}