#practice-app {
  container-type: inline-size;
  container-name: practice;
  margin: 1.2rem 0 2rem;
}

#practice-app .pa-xp {
  display: grid;
  gap: 0.6rem;
  justify-items: center;
  padding: 1rem 1rem 1.1rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  box-shadow: var(--shadow-1);
}
#practice-app .pa-xp-hud {
  width: min(100%, 26rem);
  display: grid;
  gap: 4px;
  justify-items: center;
}
#practice-app .pa-xp-num {
  font-family: var(--font-mc);
  font-size: 1.5rem;
  line-height: 1;
  color: var(--xp);
  text-shadow: 2px 0 #000, -2px 0 #000, 0 2px #000, 0 -2px #000, 2px 2px #000, -2px -2px #000, 2px -2px #000, -2px 2px #000;
}
#practice-app .pa-xpbar {
  position: relative;
  width: 100%;
  height: 14px;
  background: #1b1b1b;
  border: 2px solid #000;
  box-shadow: inset 0 0 0 1px #3c3c3c;
  overflow: hidden;
}
#practice-app .pa-xpbar::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(90deg, transparent 0 calc(5% - 1px), rgba(0, 0, 0, 0.55) calc(5% - 1px) 5%);
}
#practice-app .pa-xpfill {
  display: block;
  height: 100%;
  background: linear-gradient(180deg, #b6ff5a 0 35%, var(--xp) 35% 70%, #5cc015 70%);
  transition: width 0.6s ease;
}
#practice-app .pa-xp-text {
  margin: 0;
  text-align: center;
  color: var(--muted);
  font-size: 0.95rem;
}
#practice-app .pa-xp-text strong { color: var(--text); }

#practice-app .pa-mode {
  margin: 1rem 0;
  padding: 0.75rem 1rem;
  border: 1px solid color-mix(in srgb, var(--info) 45%, transparent);
  background: var(--info-soft);
  border-radius: var(--radius-m);
  color: var(--text);
  font-size: 0.95rem;
}
#practice-app .pa-mode[hidden] { display: none; }

#practice-app .pa-continue {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem 1.2rem;
  margin: 1rem 0;
  padding: 1rem 1.2rem;
  background: var(--accent-soft);
  border: 1px solid var(--accent);
  border-radius: var(--radius-l);
}
#practice-app .pa-continue p { margin: 0; }
#practice-app .pa-kicker {
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}
#practice-app .pa-continue-title { font-size: 1.15rem; font-weight: 700; }

#practice-app .pa-jump { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 1rem 0 0; }
#practice-app .pa-jump a {
  padding: 0.3rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text);
  text-decoration: none;
  font-size: 0.9rem;
}
#practice-app .pa-jump a:hover { background: var(--raised); }

#practice-app .pa-section { margin-top: 2rem; scroll-margin-top: calc(var(--topbar-h, 56px) + 12px); }
#practice-app .pa-section > h2 { margin-bottom: 0.2rem; }

#practice-app .pa-path {
  list-style: none;
  margin: 1.2rem 0 0;
  padding: 0;
  position: relative;
}
#practice-app .pa-path::before {
  content: "";
  position: absolute;
  left: 21px;
  top: 8px;
  bottom: 8px;
  width: 4px;
  background: var(--line);
  border-radius: 2px;
}
#practice-app .pa-stage {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.1rem 0.8rem;
  margin: 1.4rem 0 0.4rem 56px;
}
#practice-app .pa-stage:first-child { margin-top: 0; }
#practice-app .pa-stage-title { font-weight: 700; font-size: 1rem; }
#practice-app .pa-stage-text { color: var(--muted); font-size: 0.9rem; }
#practice-app .pa-step { position: relative; margin: 0; padding: 0; }
#practice-app .pa-step-link {
  position: relative;
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  grid-template-areas: "node body" ". meta";
  gap: 0.15rem 10px;
  align-items: start;
  padding: 0.55rem 0.7rem 0.55rem 0;
  border-radius: var(--radius-m);
  color: var(--text);
  text-decoration: none;
}
#practice-app .pa-step-link:hover { background: var(--raised); }
#practice-app .pa-node {
  grid-area: node;
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--surface);
  border: 3px solid var(--line);
  font-family: var(--font-mc);
  font-size: 0.95rem;
  color: var(--muted);
}
#practice-app .pa-node.is-done { background: var(--ok-soft); border-color: var(--ok); color: var(--ok); }
#practice-app .pa-step.is-next .pa-node { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); box-shadow: 0 0 0 5px var(--accent-soft); }
#practice-app .pa-step.is-next .pa-step-link { background: var(--accent-soft); outline: 1px solid var(--accent); }
#practice-app .pa-step-body { grid-area: body; display: grid; gap: 0.1rem; align-self: center; }
#practice-app .pa-step-title { font-weight: 700; }
#practice-app .pa-step-sum { color: var(--muted); font-size: 0.92rem; }
#practice-app .pa-step-meta { grid-area: meta; display: flex; flex-wrap: wrap; gap: 0.4rem; align-items: center; }
#practice-app .pa-xp-chip {
  font-family: var(--font-mc);
  font-size: 0.72rem;
  color: var(--xp);
  background: #1b1b1b;
  border: 1px solid #000;
  border-radius: var(--radius-s);
  padding: 2px 6px;
  text-shadow: 1px 1px 0 #000;
}

#practice-app .pa-check {
  display: block;
  width: 10px;
  height: 18px;
  border-right: 4px solid currentColor;
  border-bottom: 4px solid currentColor;
  transform: translateY(-2px) rotate(40deg);
}
#practice-app .pa-cross {
  position: relative;
  display: block;
  width: 18px;
  height: 18px;
}
#practice-app .pa-cross::before,
#practice-app .pa-cross::after {
  content: "";
  position: absolute;
  left: 7px;
  top: -1px;
  width: 4px;
  height: 20px;
  background: currentColor;
  border-radius: 1px;
}
#practice-app .pa-cross::before { transform: rotate(45deg); }
#practice-app .pa-cross::after { transform: rotate(-45deg); }

#practice-app .pa-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr));
  gap: 0.8rem;
  margin-top: 1rem;
}
#practice-app .pa-card {
  display: grid;
  gap: 0.35rem;
  align-content: start;
  padding: 0.8rem 0.9rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  color: var(--text);
  text-decoration: none;
}
#practice-app .pa-card:hover { border-color: var(--accent); background: var(--raised); }
#practice-app .pa-card.is-done { border-color: color-mix(in srgb, var(--ok) 55%, var(--line)); }
#practice-app .pa-card.is-next { border-color: var(--accent); background: var(--accent-soft); }
#practice-app .pa-card-top { display: flex; align-items: center; gap: 0.4rem; }
#practice-app .pa-card-done {
  margin-left: auto;
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--ok-soft);
  color: var(--ok);
  border: 2px solid var(--ok);
}
#practice-app .pa-card-done .pa-check { width: 6px; height: 11px; border-width: 3px; transform: translateY(-1px) rotate(40deg); }
#practice-app .pa-card-title { font-weight: 700; }
#practice-app .pa-card-sum { color: var(--muted); font-size: 0.9rem; }

#practice-app .pa-head { margin: 0 0 1rem; }
#practice-app .pa-crumbs { margin: 0 0 0.3rem; font-size: 0.9rem; color: var(--muted); }
#practice-app .pa-title { margin: 0 0 0.4rem; outline: none; }
#practice-app .pa-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem; margin: 0; }

#practice-app .pa-work { display: grid; gap: 1.2rem; grid-template-columns: minmax(0, 1fr); }
#practice-app .pa-col { display: grid; grid-template-columns: minmax(0, 1fr); gap: 1rem; align-content: start; min-width: 0; }
@container practice (min-width: 50rem) {
  #practice-app .pa-work { grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); }
  #practice-app .pa-col-code { position: sticky; top: calc(var(--topbar-h, 56px) + 12px); align-self: start; max-height: calc(100vh - var(--topbar-h, 56px) - 24px); overflow-y: auto; padding-right: 4px; }
}

#practice-app .pa-card-panel {
  padding: 0.9rem 1rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
}
#practice-app .pa-card-panel h3 { margin: 0 0 0.5rem; font-size: 1rem; }
#practice-app .pa-card-panel p { margin: 0 0 0.5rem; }
#practice-app .pa-card-panel p:last-child { margin-bottom: 0; }
#practice-app .pa-goal { border-left: 4px solid var(--accent); }

#practice-app .pa-preview { display: grid; gap: 0.6rem; }
#practice-app .pa-plain { margin: 0; padding: 0.6rem 0.8rem; background: #1b1b1b; color: #eee; border-radius: var(--radius-s); font-family: var(--font-mc); font-size: 0.85rem; white-space: pre-wrap; }

#practice-app .pa-learn {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
}
#practice-app .pa-learn > summary { cursor: pointer; padding: 0.8rem 1rem; font-weight: 700; }
#practice-app .pa-learn-body { padding: 0 1rem 0.9rem; }
#practice-app .pa-learn-body p,
#practice-app .pa-explain p { margin: 0 0 0.7rem; }
#practice-app .pa-learn-body code,
#practice-app .pa-explain code,
#practice-app .pa-steps code,
#practice-app .pa-hints code {
  font-family: var(--font-code);
  font-size: 0.9em;
  background: var(--raised);
  padding: 1px 5px;
  border-radius: var(--radius-s);
}
#practice-app .pa-pre {
  margin: 0 0 0.8rem;
  padding: 0.7rem 0.9rem;
  background: var(--code-bg);
  color: var(--code-fg);
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  overflow-x: auto;
  font-family: var(--font-code);
  font-size: 0.88rem;
  line-height: 1.5;
}
#practice-app .pa-pre code { background: none; padding: 0; font-size: inherit; color: inherit; }

#practice-app .pa-steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.5rem; counter-reset: step; }
#practice-app .pa-steps li { counter-increment: step; }
#practice-app .pa-step-label { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 0.6rem; align-items: start; cursor: pointer; }
#practice-app .pa-step-box { margin-top: 0.3rem; width: 1.1rem; height: 1.1rem; accent-color: var(--ok); }
#practice-app .pa-step-label.is-ticked .pa-step-text { color: var(--muted); text-decoration: line-through; }

#practice-app .pa-hints { list-style: none; margin: 0 0 0.6rem; padding: 0; display: grid; gap: 0.5rem; }
#practice-app .pa-hint { padding: 0.6rem 0.8rem; background: var(--warn-soft); border-left: 4px solid var(--warn); border-radius: var(--radius-s); }
#practice-app .pa-hint-label { display: block; font-size: 0.8rem; font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase; color: var(--warn); margin-bottom: 0.2rem; }
#practice-app .pa-hint p { margin: 0; }

#practice-app .pa-editor { min-width: 0; }
#practice-app .pa-tabs { display: flex; flex-wrap: wrap; gap: 2px; }
#practice-app .pa-tab {
  padding: 0.4rem 0.8rem;
  font-family: var(--font-code);
  font-size: 0.85rem;
  background: var(--raised);
  color: var(--muted);
  border: 1px solid var(--line);
  border-bottom: none;
  border-radius: var(--radius-s) var(--radius-s) 0 0;
  cursor: pointer;
}
#practice-app .pa-tab[aria-selected="true"] { background: var(--code-bg); color: var(--text); }
#practice-app .pa-tab-ro { font-family: var(--font-body); font-size: 0.75rem; }
#practice-app .pa-pane[hidden] { display: none; }
#practice-app .pa-textarea { width: 100%; min-height: 22rem; font-family: var(--font-code); font-size: 0.88rem; line-height: 1.5; background: var(--code-bg); color: var(--code-fg); tab-size: 4; }

#practice-app .pa-toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem; }
#practice-app .pa-toolbar .pa-keys { margin-left: auto; }

#practice-app .pa-confirm {
  padding: 0.7rem 0.9rem;
  background: var(--warn-soft);
  border: 1px solid var(--warn);
  border-radius: var(--radius-m);
}
#practice-app .pa-confirm p { margin: 0 0 0.5rem; }

#practice-app .pa-results:empty { display: none; }
#practice-app .pa-summary { margin: 0 0 0.5rem; padding: 0.55rem 0.8rem; border-radius: var(--radius-m); font-weight: 700; }
#practice-app .pa-summary.is-ok { background: var(--ok-soft); color: var(--ok); }
#practice-app .pa-summary.is-bad { background: var(--bad-soft); color: var(--bad); }
#practice-app .pa-test-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.4rem; }
#practice-app .pa-test {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 0.6rem;
  align-items: start;
  padding: 0.5rem 0.7rem;
  border-radius: var(--radius-m);
  border: 1px solid var(--line);
}
#practice-app .pa-test.is-ok { background: var(--ok-soft); border-color: color-mix(in srgb, var(--ok) 55%, transparent); }
#practice-app .pa-test.is-bad { background: var(--bad-soft); border-color: color-mix(in srgb, var(--bad) 55%, transparent); }
#practice-app .pa-test-mark {
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 2px solid currentColor;
}
#practice-app .pa-test.is-ok .pa-test-mark { color: var(--ok); }
#practice-app .pa-test.is-bad .pa-test-mark { color: var(--bad); }
#practice-app .pa-test-mark .pa-check { width: 7px; height: 12px; border-width: 3px; transform: translateY(-1px) rotate(40deg); }
#practice-app .pa-test-mark .pa-cross { width: 12px; height: 12px; }
#practice-app .pa-test-mark .pa-cross::before,
#practice-app .pa-test-mark .pa-cross::after { left: 4px; top: -1px; width: 3px; height: 14px; }
#practice-app .pa-test-name { margin: 0; font-weight: 700; }
#practice-app .pa-test-msg { margin: 0.2rem 0 0; color: var(--text); font-size: 0.95rem; overflow-wrap: anywhere; }
#practice-app .pa-note { padding: 0.7rem 0.9rem; border-radius: var(--radius-m); border: 1px solid var(--line); background: var(--surface); }
#practice-app .pa-note-info { background: var(--info-soft); border-color: color-mix(in srgb, var(--info) 45%, transparent); }
#practice-app .pa-note-bad { background: var(--bad-soft); border-color: color-mix(in srgb, var(--bad) 55%, transparent); }
#practice-app .pa-compile {
  margin: 0.6rem 0 0;
  padding: 0.6rem 0.8rem;
  background: var(--code-bg);
  color: var(--code-fg);
  border-radius: var(--radius-s);
  font-family: var(--font-code);
  font-size: 0.85rem;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
#practice-app .pa-output pre { margin: 0.4rem 0 0; padding: 0.5rem 0.7rem; background: var(--code-bg); color: var(--code-fg); font-family: var(--font-code); font-size: 0.85rem; white-space: pre-wrap; }

#practice-app .pa-below { display: grid; grid-template-columns: minmax(0, 1fr); gap: 1rem; }
#practice-app .pa-below:empty { display: none; }
#practice-app .pa-success {
  padding: 1rem 1.1rem;
  background: var(--ok-soft);
  border: 2px solid var(--ok);
  border-radius: var(--radius-l);
  outline: none;
}
#practice-app .pa-success-title { margin: 0 0 0.6rem; font-size: 1.3rem; font-weight: 800; color: var(--ok); }
#practice-app .pa-success-actions { margin-top: 0.8rem; }
#practice-app .pa-solution,
#practice-app .pa-explain-box { padding: 0.9rem 1rem; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-m); }
#practice-app .pa-solution h3 { margin: 0 0 0.3rem; font-size: 1rem; }
#practice-app .pa-solution-head { display: flex; flex-wrap: wrap; align-items: center; gap: 0.4rem; margin-bottom: 0.3rem; }
#practice-app .pa-solution-name { font-family: var(--font-code); font-size: 0.85rem; margin-right: auto; }
#practice-app .pa-explain-box > summary { cursor: pointer; font-weight: 700; }

@media (max-width: 560px) {
  #practice-app .pa-step-link { grid-template-columns: 38px minmax(0, 1fr); gap: 0.15rem 8px; }
  #practice-app .pa-node { width: 38px; height: 38px; font-size: 0.8rem; }
  #practice-app .pa-path::before { left: 17px; }
  #practice-app .pa-stage { margin-left: 46px; }
  #practice-app .pa-toolbar .pa-keys { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  #practice-app .pa-xpfill { transition: none; }
}

#practice-app .pa-steps code,
#practice-app .pa-hints code,
#practice-app .pa-learn-body code,
#practice-app .pa-explain code {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
#practice-app .pa-pre code {
  white-space: pre;
  overflow-wrap: normal;
}

#practice-app .pa-col-code > * { min-width: 0; }