/* Shared shell contract: loaded after foundations and extra_head, before
   ui-pages and ui-operations. Page owners scope their composition below this. */
:root {
  --brand: #a7d957;
  --brand-deep: #60932f;
  --brand-soft: #edf6db;
  --grass: #a7d957;
  --grass-deep: #60932f;
  --ink: #183d32;
  --ink-soft: #52675e;
  --ink-faint: #65776d;
  --ink-grass: #345b21;
  --paper: #ffffff;
  --canvas: #f7f8f2;
  --canvas-deep: #eef1e7;
  --line: #dce3d5;
  --link: #285d4b;
  --sun: #f4ce57;
  --sun-deep: #aa7923;
  --coin-bg: #ffdfbd;
  --coin-ink: #713808;
  --coin-border: #dc9a54;
  --sky: #acd7eb;
  --sky-deep: #326983;
  --violet: #c6b8ed;
  --violet-deep: #705795;
  --shell-rail: 248px;
  --shell-shadow: 0 12px 36px rgb(24 61 50 / 9%);
  --nav-h: 80px;
}

body[data-ui-shell] { background: var(--canvas); }
body[data-ui-shell] > main { min-inline-size: 0; }
.ui-icon { inline-size: 24px; block-size: 24px; flex: none; vertical-align: middle; }
.sr-only {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}
/* Keyboard feedback lives on the control, preserving its state and shadow. */
body :is(a, button, summary, input[type="submit"], input[type="button"], input[type="reset"], [tabindex]:not(input, select, textarea)):not([tabindex="-1"]):focus-visible {
  background-image: linear-gradient(rgb(40 93 75 / 20%), rgb(40 93 75 / 20%));
  border-color: currentColor;
}
.skip-link:focus { z-index: 10000; background: var(--ink); color: #fff; }
#main:focus { outline: none; }

/* Every primary control has readable forest ink and a firm, tactile edge. */
.btn, .btn-grass, .btn-primary {
  color: var(--btn-text);
  background: var(--btn-face);
  border-color: var(--btn-edge);
  box-shadow: 0 4px 0 var(--btn-edge);
  text-shadow: none;
  min-block-size: 46px;
  font-weight: 800;
  transition: transform 140ms ease, box-shadow 140ms ease, background 140ms ease;
}
.btn:hover, .btn-grass:hover, .btn-primary:hover {
  color: var(--btn-text);
  background: var(--btn-face);
  transform: translateY(-1px);
  box-shadow: 0 5px 0 var(--btn-edge);
}
.btn:active, .btn-grass:active, .btn-primary:active {
  transform: translateY(3px);
  box-shadow: 0 1px 0 var(--btn-edge);
}
.btn-outline, .btn-ghost, .btn-secondary {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--line);
  box-shadow: 0 3px 0 var(--line);
}
.btn-outline:hover, .btn-ghost:hover, .btn-secondary:hover {
  background: var(--brand-soft);
  color: var(--ink);
  box-shadow: 0 4px 0 var(--line);
}
.btn-coral { --btn-face: #fae5df; --btn-edge: #c8877d; --btn-text: #822f2a; }
.btn-danger { background: #fae5df; color: #822f2a; border-color: #c8877d; box-shadow: 0 4px 0 #c8877d; }
.btn-danger:hover { background: #f7d7ce; color: #822f2a; box-shadow: 0 5px 0 #c8877d; }
.btn:disabled, .btn[aria-disabled="true"] { transform: none; box-shadow: none; }
input, textarea, select { accent-color: #527c2c; }
body :is(input:not([type="range"]):not([type="checkbox"]):not([type="radio"]):not([type="submit"]):not([type="button"]), textarea:not([data-editor-code]), select):focus-visible { background-color: #edf6db; }
/* Labels also reveal focus on native unchecked controls. */
body label:has(:is(input[type="checkbox"], input[type="radio"]):focus-visible),
body :is(input[type="checkbox"], input[type="radio"]):focus-visible + label { background-color: #cde6b0; color: #183d32; }
@media (forced-colors: none) {
  input:is([type="checkbox"], [type="radio"]):focus-visible { outline: 2px solid #285d4b; outline-offset: -2px; }
  input[type="range"]:is(:focus-visible, :active) { accent-color: #183d32; }
}
.flash { border-radius: 18px; border-width: 1px; padding: 1rem 1.2rem; }

/* Compact HUD. Navigation itself becomes a rail only for signed-in readers. */
.site-header {
  position: sticky;
  inset-block-start: 0;
  z-index: 100;
  background: var(--canvas);
  border-block-end: 1px solid var(--line);
  box-shadow: none;
  backdrop-filter: none;
}
.nav.container {
  inline-size: calc(100% - 3rem);
  max-inline-size: 1280px;
  min-block-size: var(--nav-h);
  gap: 0.8rem;
  padding-block: 0.6rem;
}
.nav .brand { gap: 0.7rem; color: var(--ink); }
.nav .brand picture { display: flex; align-items: center; justify-content: center; inline-size: 44px; block-size: 44px; line-height: 0; flex: none; }
.nav .brand-logo { display: block; inline-size: 44px; block-size: 44px; max-inline-size: 100%; max-block-size: 100%; object-fit: contain; filter: none; }
.nav .brand-name { color: var(--ink); font-size: 1.18rem; letter-spacing: -0.035em; }
.nav .brand-name b { color: var(--ink); }
.nav .nav-stars, .nav .nav-bell, .nav .credits-chip, .nav .user-chip,
.nav .langpick summary, .nav .nav-toggle, .nav .nav-link, .nav .btn, .nav .linklike {
  box-sizing: border-box;
  min-block-size: 44px;
  align-items: center;
  padding-block: 0.35rem;
  line-height: 1.4;
  border: 1px solid transparent;
  border-radius: 14px;
  box-shadow: none;
}
.nav .nav-stars, .nav .nav-bell, .nav .credits-chip, .nav .user-chip,
.nav .langpick summary { block-size: 44px; }
.nav .nav-link {
  color: var(--ink-soft);
  gap: 0.8rem;
  font-size: 0.93rem;
  font-weight: 750;
  white-space: normal;
  text-decoration: none;
}
.nav .nav-link:hover { background: var(--canvas-deep); color: var(--ink); }
.nav [aria-current="page"] {
  color: var(--ink-grass);
  background: var(--brand-soft);
  border-color: #c8dda8;
  box-shadow: none;
}
.nav .nav-links .nav-label {
  position: static;
  inline-size: auto;
  block-size: auto;
  overflow: visible;
  clip-path: none;
  clip: auto;
  white-space: normal;
}
.nav .nav-link .ui-icon { color: var(--ink-soft); }
.nav .nav-link[aria-current="page"] .ui-icon { color: #4a742d; }
.nav .nav-ring { inline-size: 44px; block-size: 44px; border-radius: 50%; flex: none; box-shadow: none; background: transparent; }
.nav-ring-value { color: var(--ink); }
.nav .nav-stars .ui-icon, .nav .nav-bell .ui-icon,
.nav .credits-chip .ui-icon, .nav .user-chip .ui-icon, .nav .user-chip .avatar,
.nav .nav-link .ui-icon, .nav .nav-toggle .ui-icon, .nav .btn .ui-icon,
.nav .linklike .ui-icon { inline-size: 20px; block-size: 20px; }
.nav .nav-stars .lvl { display: inline-flex; align-items: center; justify-content: center; line-height: 1; color: inherit; }
[dir="rtl"] .nav .ui-icon[data-icon="login"],
[dir="rtl"] .nav .ui-icon[data-icon="logout"] { transform: scaleX(-1); }
.nav .nav-stars { min-inline-size: 44px; justify-content: center; padding-inline: 0.8rem; }
.nav .nav-stars, .nav .nav-bell, .nav .credits-chip {
  color: #735419;
  background: #fff3c7;
  border-color: #ead69a;
}
.nav .nav-bell {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  inline-size: 44px;
  block-size: 44px;
  flex: none;
}
.nav-badge { background: #973a32; color: #fff; min-inline-size: 20px; }
.nav .credits-chip, .nav .user-chip {
  gap: 0.25rem;
  padding-inline: 0.55rem;
  font-size: 0.92rem;
  font-weight: 800;
  white-space: nowrap;
}
.nav .credits-chip.is-low { color: #822f2a; background: #fae5df; border-color: #e9c0b6; }
.nav .credits-chip:not(.is-low) { color: var(--coin-ink); background-color: var(--coin-bg); border-color: var(--coin-border); }
.nav .nav-identity { min-inline-size: 0; }
.nav .user-chip .avatar { display: grid; place-items: center; background: transparent; color: inherit; border: 0; border-radius: 0; flex: none; }
.nav .user-chip {
  inline-size: fit-content;
  max-inline-size: min(100%, 190px);
  min-inline-size: 0;
  flex: 0 1 auto;
  align-self: center;
  direction: inherit;
  justify-content: flex-start;
  color: #584570;
  background: #e5ddf5;
  border-color: #bda7dc;
}
.nav .user-chip:hover { filter: brightness(1.03); }
.nav .user-chip[aria-current="page"] {
  color: #49345f;
  background: #d7c4ee;
  border-color: #8d6caf;
}
.nav .user-chip[aria-current="page"]:hover { background: #ccb5e8; }
.nav .user-chip:focus-visible { border-color: #705795; }
.nav .user-chip-name {
  display: flex;
  direction: inherit;
  text-align: start;
  flex: 1 1 auto;
  min-inline-size: 0;
  max-inline-size: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.nav .user-chip-name bdi {
  max-inline-size: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
}
.nav .linklike { display: inline-flex; gap: 0.8rem; font-size: 0.88rem; padding-inline: 0.85rem; }
.nav .btn, .nav .linklike { color: var(--ink-soft); background: var(--paper); border-color: var(--line); }
.nav .btn:hover, .nav .btn:active, .nav .linklike:hover { color: var(--ink); background: var(--canvas-deep); transform: none; box-shadow: none; }
.nav .langpick summary {
  color: var(--ink);
  background: var(--paper);
  border-color: var(--line);
}
.langpick-name { max-inline-size: 10ch; }
.langpick-menu { border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shell-shadow); z-index: 120; }
.langpick-item { min-block-size: 44px; }
.langpick-item.is-active, .langpick-check { color: var(--ink-grass); }
.nav .nav-toggle { color: var(--ink); border-color: #c5d2bf; inline-size: 44px; block-size: 44px; }
.nav-toggle[aria-expanded="true"] { background: var(--brand-soft); box-shadow: none; }
.nav .nav-links[hidden] { display: none; }
.site-footer { border-block-start: 1px solid var(--line); background: transparent; color: var(--ink-soft); padding-block: 1.5rem; }
.site-footer .container { font-size: 0.8rem; line-height: 2.4; }

@media (min-width: 901px) {
  /* Direct-child grid only. Nested .page elements never acquire a gutter. */
  body[data-ui-shell="authenticated"] {
    display: grid;
    grid-template-columns: var(--shell-rail) minmax(0, 1fr);
    grid-template-rows: auto 1fr auto;
  }
  body[data-ui-shell="authenticated"] > .site-header,
  body[data-ui-shell="authenticated"] > main,
  body[data-ui-shell="authenticated"] > .site-footer { grid-column: 2; }
  body[data-ui-shell="authenticated"] > main { inline-size: min(var(--page), 100% - 3rem); padding-block-start: 2.5rem; }
  body[data-ui-shell="authenticated"] .nav > .brand {
    position: fixed;
    inset-block-start: 0;
    inset-inline-start: 0;
    inline-size: var(--shell-rail);
    block-size: 96px;
    padding-inline: 22px;
    border-inline-end: 1px solid var(--line);
    background: var(--paper);
  }
  body[data-ui-shell="authenticated"] .nav > .nav-links {
    position: fixed;
    inset-inline-start: 0;
    inset-block-start: 96px;
    inset-block-end: 0;
    inline-size: var(--shell-rail);
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0.65rem;
    padding: 12px 18px 24px;
    background: var(--paper);
    border-inline-end: 1px solid var(--line);
    overflow-y: auto;
    overflow-x: hidden;
  }
  body[data-ui-shell="authenticated"] .nav-links > .nav-link { padding-inline: 1rem; flex: none; }
  body[data-ui-shell="authenticated"] .nav-identity {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0.7rem;
    padding-block-start: 1.1rem;
    margin-block-start: auto;
    border-block-start: 1px solid var(--line);
  }
  body[data-ui-shell="authenticated"] .nav-identity .credits-chip,
  body[data-ui-shell="authenticated"] .nav .user-chip { align-self: flex-start; font-size: 0.8rem; }
  body[data-ui-shell="authenticated"] .nav-links > .user-chip { margin-block-start: auto; }
  body[data-ui-shell="authenticated"] .nav-links .inline-form { margin: 0; }
  body[data-ui-shell="authenticated"] .nav-links .linklike { text-align: start; inline-size: 100%; padding-inline: 1rem; }
  body[data-ui-shell="authenticated"] .nav-spacer { order: -1; }
  body[data-ui-shell="public"] .nav-links { overflow: visible; gap: 1rem; }
}

@media (max-width: 900px) {
  :root { --nav-h: 68px; }
  .nav.container { inline-size: calc(100% - 1.5rem); gap: 0.4rem; row-gap: 0.6rem; }
  .nav .brand-logo { inline-size: 38px; block-size: 38px; }
  .nav > .brand { order: 1; }
  .nav > .nav-ring, .nav > .nav-stars, .nav > .nav-bell { order: 2; }
  .nav > .langpick { order: 3; margin-inline-start: auto; }
  .nav > .nav-toggle { order: 4; }
  .nav > .nav-links {
    order: 10;
    inline-size: 100%;
    flex-basis: 100%;
    align-items: stretch;
    overflow: auto;
    max-block-size: calc(100dvh - 90px);
    gap: 0.45rem;
    padding-block: 0.7rem;
    border-block-start: 1px solid var(--line);
  }
  .nav-links .nav-link { padding-inline: 1rem; }
  .nav-links .nav-identity { flex-wrap: wrap; padding-block-start: 0.5rem; }
  .nav-links .inline-form { padding: 0; }
  .nav-links .linklike { padding-inline: 1rem; }
  .nav-links .btn { justify-content: center; padding-inline: 1rem; }
  .nav .nav-stars { padding-inline: 0.45rem; font-size: 0.8rem; gap: 0.2rem; }
  .nav .brand-name { display: none; }
  .langpick > summary { padding-inline: 0.5rem; }
  .langpick-name { max-inline-size: 6ch; }
  /* The disclosure is enhanced only after its handlers attach. A blocked
     bundle or disabled JS leaves all navigation links available. */
  html:not(.nav-ready) .nav-toggle { display: none; }
  html:not(.nav-ready) .nav-toggle[aria-expanded="false"] + .nav-links { display: flex; }
  .nav-ready .nav-toggle[aria-expanded="false"] + .nav-links { display: none; }
  body[data-ui-shell] > main { padding-block-end: 6rem; }
  body[data-ui-shell] > .site-footer { padding-block-end: 6rem; }
}
@media (max-width: 380px) {
  .nav.container { inline-size: calc(100% - 1rem); gap: 0.25rem; }
  .nav .brand-logo { inline-size: 32px; block-size: 32px; }
  .langpick-name { max-inline-size: 4ch; }
  .nav .nav-stars { padding-inline: 0.2rem; }
}

/* Pity's desk: lesson context stays visible, controls stay comfortably sized. */
.robot-fab {
  color: var(--ink);
  background: var(--brand);
  border: 1px solid var(--brand-deep);
  box-shadow: 0 4px 0 var(--brand-deep), 0 8px 24px rgb(24 61 50 / 12%);
  border-radius: 20px;
  min-block-size: 54px;
  z-index: 150;
}
.robot-fab-pulse { display: none; }
.robot-panel {
  border: 1px solid #bccdb4;
  border-radius: 24px;
  box-shadow: 0 20px 65px rgb(24 61 50 / 18%);
  background: var(--canvas);
  z-index: 160;
}
.robot-panel[hidden] { display: none; }
.robot-panel.is-small { inline-size: min(390px, calc(100vw - 2rem)); block-size: min(550px, 75dvh); }
.robot-head { background: #eaf3d9; border-block-end: 1px solid #cdddba; padding: 0.75rem; gap: 0.35rem; }
.robot-head h3 { color: var(--ink); font-size: 1rem; }
.robot-head-pity { background: var(--paper); border: 1px solid #cdddba; border-radius: 14px; padding: 0.3rem; }
.robot-head-credits { color: var(--coin-ink); background: var(--coin-bg); border: 1px solid var(--coin-border); border-radius: 10px; font-size: 0.76rem; padding: 0.25rem 0.4rem; }
.robot-head-credits, .robot-cost { display: inline-flex; align-items: center; gap: 0.3em; }
.robot-head-credits .ui-icon, .robot-cost .ui-icon { inline-size: 1em; block-size: 1em; flex: none; }
.robot-head .robot-btn { color: var(--ink); background: transparent; border: 1px solid transparent; border-radius: 10px; inline-size: 36px; block-size: 44px; opacity: 1; }
.robot-head .robot-btn:hover, .robot-head .robot-btn[aria-pressed="true"] { background: var(--paper); border-color: #cdddba; }
.robot-head .robot-btn .ui-icon { inline-size: 1.15rem; block-size: 1.15rem; }
.robot-log { padding: 1rem; gap: 0.9rem; overscroll-behavior: contain; }
.robot-msg { border-radius: 17px; padding: 0.85rem 1rem; font-size: 0.87rem; line-height: 1.85; max-inline-size: 94%; overflow-wrap: anywhere; box-shadow: none; }
/* Markdown block spacing must not also preserve serializer newlines. Plain
   student/error bubbles retain main.css's pre-wrap; Python retains its spaces. */
.robot-msg.markdown-body { white-space: normal; }
.robot-msg.markdown-body :is(p, ul, ol, pre, blockquote) { margin-block: 0.45em; }
.robot-msg.markdown-body > :first-child { margin-block-start: 0; }
.robot-msg.markdown-body > :last-child { margin-block-end: 0; }
.robot-msg.markdown-body li > p { margin-block: 0; }
.robot-msg.markdown-body :not(pre) > code { white-space: pre-wrap; direction: ltr; unicode-bidi: isolate; }
.robot-msg.markdown-body pre,
.robot-msg.markdown-body pre code { white-space: pre; direction: ltr; text-align: left; }
.robot-msg.markdown-body pre { max-inline-size: 100%; overflow-x: auto; }
.robot-msg.from-bot { background: var(--paper); border: 1px solid var(--line); color: var(--ink); border-start-start-radius: 5px; }
.robot-msg.from-me { background: #e9e1f7; border: 1px solid #d7c9eb; color: #49385f; border-start-end-radius: 5px; }
.robot-msg.is-error { background: #fff0eb; color: #822f2a; border-color: #e7b9ac; }
.robot-msg.is-asleep { background: #fff3c7; color: #735419; }
.robot-msg.is-asleep::before { content: none; }
.robot-msg.is-asleep > .ui-icon { inline-size: 1.2em; block-size: 1.2em; vertical-align: middle; margin-inline-start: 0.35em; }
.robot-asks { gap: 0.5rem; padding: 0.5rem 1rem 0.8rem; background: var(--canvas); }
.robot-ask { background: var(--paper); border: 1px solid #c5d2bf; border-radius: 12px; color: var(--ink); padding: 0.55rem 0.7rem; min-block-size: 44px; white-space: normal; text-align: start; }
.robot-foot { padding: 0.8rem; background: var(--paper); border-block-start: 1px solid var(--line); gap: 0.65rem; align-items: end; }
.robot-input { background: var(--canvas); color: var(--ink); border: 1px solid #a6b69f; border-radius: 14px; min-block-size: 48px; padding: 0.8rem; font-size: 0.9rem; }
.robot-input:focus { border-color: #285d4b; }
.robot-send { min-inline-size: 48px; block-size: 48px; border-radius: 14px; background: var(--brand); color: var(--ink); box-shadow: 0 3px 0 var(--brand-deep); }
[dir="rtl"] .robot-send .ui-icon { transform: scaleX(-1); }
.robot-retry { background: var(--brand); color: var(--ink); min-block-size: 44px; }
.robot-retry:hover { background: var(--brand-soft); color: var(--ink); }
.robot-typing i { background: #527c2c; animation-iteration-count: 6; }

/* Clear recovery, with original Pity and an editorial error number. */
.shell-error {
  position: relative;
  max-inline-size: 780px;
  padding: clamp(1.5rem, 5vw, 3.5rem);
  margin-block: clamp(1rem, 5vh, 3rem);
  border: 1px solid var(--line);
  border-radius: 30px;
  background: var(--paper);
  box-shadow: 0 6px 0 #e8ecdf;
  text-align: center;
}
.shell-error-code { display: block; font-size: 0.85rem; font-weight: 850; color: var(--ink-soft); letter-spacing: 0.2em; margin-block-end: 1rem; }
.shell-error .pity-lost { padding: 1rem 2rem; background: #edf3df; border-radius: 48% 52% 44% 56%; }
.shell-error h1 { margin-block-start: 1.2rem; font-size: clamp(1.6rem, 3vw, 2.4rem); text-wrap: balance; }
.shell-error p { max-inline-size: 52ch; margin-inline: auto; color: var(--ink-soft); }
.shell-error p:last-child { margin-block: 1.7rem 0; }

/* Overlay surfaces keep the announcements' existing form and dismiss hooks. */
.celebrate-veil, .popup-back { background: rgb(24 45 35 / 48%); }
.celebrate-card { background: var(--canvas); color: var(--ink); border: 1px solid #cdddba; border-radius: 30px; box-shadow: var(--shell-shadow); }
.celebrate-card h2 { color: var(--ink); }
.celebrate-emoji { animation-iteration-count: 2; }
.celebrate-emoji > .ui-icon { inline-size: 1em; block-size: 1em; }
.quiz-verdict > .ui-icon, .bug-note > .ui-icon { vertical-align: middle; margin-inline-end: 0.35em; }
.editable-actions .ui-icon { inline-size: 1.1em; block-size: 1.1em; margin-inline-end: 0.35em; }
.popup-card { border: 1px solid var(--line); border-radius: 24px; background: var(--paper); box-shadow: var(--shell-shadow); }
.popup-foot { gap: 0.8rem; }
.popup-foot .popup-never { background: transparent; color: var(--ink-soft); box-shadow: none; }

@media (max-width: 600px), (pointer: coarse) and (max-width: 1024px) {
  .robot-panel, .robot-panel.is-small, .robot-panel.is-large, .robot-panel.is-full {
    inset: 0;
    inline-size: 100%;
    block-size: 100dvh;
    max-block-size: 100dvh;
    border-radius: 0;
  }
  .robot-head { padding-block-start: max(0.7rem, env(safe-area-inset-top)); }
  .robot-head .robot-close { inline-size: 44px; }
  .robot-head-credits { display: inline-flex; }
  .robot-foot { padding-block-end: max(0.8rem, env(safe-area-inset-bottom)); }
  .robot-fab { inset-block-end: max(1rem, env(safe-area-inset-bottom)); inset-inline-end: 1rem; }
}

/* Finite entrance feedback. Information is visible even without animation. */
@keyframes shell-enter {
  from { opacity: 0; transform: translateY(7px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes shell-page-in { from { opacity: 0; } to { opacity: 1; } }
@media (prefers-reduced-motion: no-preference) {
  body[data-ui-shell] > main { animation: shell-page-in 320ms ease-out; }
  .robot-panel:not([hidden]) { animation: shell-enter 200ms ease-out both; }
  .nav-toggle[aria-expanded="true"] + .nav-links { animation: shell-enter 160ms ease-out both; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
  .robot-typing i { animation: none; opacity: 0.8; }
  .btn:hover, .btn:active, .robot-fab:hover, .robot-fab:active { transform: none; }
}
@media print {
  body[data-ui-shell="authenticated"] { display: block; }
  body[data-ui-shell="authenticated"] > main { inline-size: 100%; margin: 0; padding: 0; animation: none; }
  .site-header, .site-footer, .robot-fab, .robot-panel { display: none !important; }
}

/* One immediate, hoverable hint above the shell and Pity panel. */
.ui-tooltip {
  position: fixed;
  z-index: 10010;
  box-sizing: border-box;
  inline-size: max-content;
  max-inline-size: min(24rem, calc(100vw - 16px));
  padding: .55rem 1rem;
  border: 1px solid #597e6a;
  border-radius: 12px;
  background: #183d32;
  color: #f7f8f2;
  box-shadow: 0 4px 14px rgb(25 62 50 / 18%);
  font-family: Estedad, sans-serif;
  font-size: .9rem;
  font-weight: 600;
  line-height: 1.7;
  text-align: start;
  white-space: normal;
  overflow-wrap: anywhere;
  pointer-events: auto;
}
.ui-tooltip[hidden] { display: none; }
.ui-tooltip::after {
  content: "";
  position: absolute;
  left: var(--tooltip-arrow, 50%);
  width: 8px;
  height: 8px;
  background: #183d32;
  transform: translateX(-50%) rotate(45deg);
}
.ui-tooltip[data-side="above"]::after { top: calc(100% - 4px); border-right: 1px solid #597e6a; border-bottom: 1px solid #597e6a; }
.ui-tooltip[data-side="below"]::after { bottom: calc(100% - 4px); border-left: 1px solid #597e6a; border-top: 1px solid #597e6a; }

/* Course achievement and spendable diamonds remain distinct at every width. */
.star-fraction { display: inline-block; unicode-bidi: isolate; font-variant-numeric: tabular-nums; }
.nav .nav-diamonds, .nav .nav-bebras {
  display: inline-flex; align-items: center; justify-content: center; gap: .35rem;
  box-sizing: border-box; min-block-size: 44px; min-inline-size: 44px;
  padding: .35rem .7rem; border: 1px solid #a6d9cc; border-radius: 14px; box-shadow: none;
  color: #165b50; background: #e1f4ed; font-size: .9rem; font-weight: 800;
  text-decoration: none; max-inline-size: 100%; overflow-wrap: anywhere;
}
.nav .nav-diamonds .ui-icon { inline-size: 20px; block-size: 20px; flex: none; }
.nav .nav-bebras { color: #5f4932; background: #fff6e6; border-color: #cfb991; line-height: 1.4; flex-shrink: 0; }
.nav .nav-bebras .ui-icon { inline-size: 30px; block-size: 30px; }
.nav .nav-bebras:hover { background: #f1e1c6; border-color: #af8f62; }
.nav .nav-stars { block-size: auto; min-block-size: 44px; max-inline-size: 100%; }
.nav .nav-stars .star-fraction { overflow-wrap: anywhere; white-space: normal; }
.nav .nav-diamonds:hover { background: #ccece0; border-color: #77b8a6; }
.nav .nav-stars:focus-visible, .nav .nav-diamonds:focus-visible, .nav .nav-bebras:focus-visible { border-color: currentColor; }
@media (min-width: 901px) {
  .nav:has(> .nav-bebras) { flex-wrap: wrap; }
  .nav:has(> .nav-bebras) > :is(.nav-stars, .nav-diamonds, .nav-bebras) { flex-shrink: 0; }
}
@media (max-width: 900px) {
  .nav > .nav-diamonds, .nav > .nav-bebras { order: 2; font-size: .8rem; padding-inline: .45rem; }
  .nav .nav-stars, .nav .nav-diamonds, .nav .nav-bebras { flex: 0 1 auto; min-inline-size: 0; }
}
@media (max-width: 480px) {
  /* Two deliberate rows leave space for long balances and the language control. */
  body[data-ui-shell="authenticated"] .nav:has(> .nav-stars):has(> .nav-diamonds)::after {
    content: ""; flex: 0 0 100%; block-size: 0; order: 4;
  }
  .nav > .nav-stars, .nav > .nav-diamonds { order: 5; flex: 1 1 40%; }
  .nav > .nav-bebras { order: 5; }
  .nav:has(> .nav-bebras) > :is(.nav-stars, .nav-diamonds, .nav-bebras) {
    flex: 1 1 0; min-inline-size: 0; block-size: auto; align-self: stretch; padding-inline: .45rem;
  }
  .nav > .nav-bell { order: 2; }
  .nav .langpick-name { max-inline-size: none; overflow: visible; text-overflow: clip; }
}
@media (max-width: 380px) {
  .nav:has(> .nav-bebras) > :is(.nav-stars, .nav-diamonds, .nav-bebras) { padding-inline: .2rem; }
}
@media (forced-colors: active) {
  body :is(a, button, input, select, textarea, summary, [tabindex]):focus-visible { outline: 2px solid Highlight; outline-offset: 2px; }
  body #main:focus { outline: none; }
}