/* Studio skin: shared controls, with an unframed entrance and the original pen marks. */
:root {
  --paper: #ffffff;
  --sheet: #ffffff;
  --sunk: #f3f5f7;
  --ink: #20262e;
  --ink-body: #444d57;
  --ink-mute: #6c7680;
  --ink-faint: #b1bdc3;
  --rule: #e5e9ec;
  --rule-strong: #d4dde2;
  --accent: #3158a4;
  --accent-fill: #294c91;
  --accent-fill-hover: #203e78;
  --accent-wash: #edf2fa;
  --accent-ring: rgba(49, 88, 164, .14);
  --studio-leaf: #316b5e;
  --studio-mist: #f3f8f6;
  --studio-leaf-wash: #e8f1ed;
  --studio-input: #fbfcfd;
  --studio-input-hover: #a4b5c5;
  --studio-error-ring: rgba(210, 67, 58, .12);
  --studio-error-rule: #c7544c;
  --studio-shadow: 0 2px 4px rgba(32, 38, 46, .03), 0 18px 40px -24px rgba(32, 38, 46, .24);
  --studio-button-border: rgba(255, 255, 255, .22);
  --studio-button-light: rgba(255, 255, 255, .12);
  --studio-button-sheen: rgba(255, 255, 255, .2);
  --studio-button-edge: rgba(20, 35, 90, .18);
  --studio-button-shadow: 0 1px 2px rgba(20, 35, 90, .1), 0 6px 14px -10px rgba(41, 76, 145, .45);
  --studio-button-hover-shadow: 0 2px 4px rgba(20, 35, 90, .12), 0 10px 20px -12px rgba(41, 76, 145, .4);
  --studio-control-shadow: 0 1px 2px rgba(32, 38, 46, .04);
  --page: 1480px;
  --gutter: 48px;
}

body { letter-spacing: 0; }
main { padding-block: 36px 52px; }
::selection { background: var(--studio-leaf-wash); }
.topbar { background: var(--sheet); }
.topbar-inner { min-height: 84px; gap: 16px 32px; }
.brand-wordmark { display: grid; gap: 2px; min-width: 0; }
.brand-name { font-size: 1.0625rem; line-height: 1.35; }
.brand-product {
  display: block;
  padding: 0;
  border: 0;
  color: var(--ink-mute);
  font-size: .75rem;
  line-height: 1.4;
}
.topnav { gap: 6px; }
.topnav a, .topnav button { gap: 8px; border-radius: 6px; padding-inline: 14px; }
.topnav a[aria-current="page"] { color: var(--studio-leaf); background: var(--studio-leaf-wash); }
.topnav .nav-login {
  background: var(--sheet);
  border-color: var(--rule-strong);
  box-shadow: var(--studio-control-shadow);
  transition: background-color .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease);
}
.topnav .nav-login:is(:hover, :focus-visible) { background: var(--studio-mist); border-color: var(--studio-leaf); color: var(--studio-leaf); }
.button {
  --btn-shadow: var(--studio-button-shadow);
  --btn-border: var(--studio-button-edge);
  --btn-inner-border: var(--studio-button-border);
  position: relative;
  isolation: isolate;
  overflow: clip;
  min-height: 48px;
  padding: 12px 20px;
  border-radius: 6px;
  background-image: linear-gradient(180deg, var(--studio-button-light), transparent 70%);
  transition: background-color .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease),
              box-shadow .2s var(--ease), transform .15s var(--ease);
}
.button::before {
  content: "";
  position: absolute;
  inset: 3px;
  border: 1px solid var(--btn-inner-border);
  border-radius: 3px;
  pointer-events: none;
}
.button::after {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 0;
  background: linear-gradient(110deg, transparent 25%, var(--studio-button-sheen) 50%, transparent 75%);
  transform: translateX(-130%);
  pointer-events: none;
}
.button:not(:disabled, [aria-disabled="true"]):is(:hover, :focus-visible) {
  --btn-bg: var(--accent-fill-hover);
  --btn-shadow: var(--studio-button-hover-shadow);
}
.button.quiet {
  --btn-bg: var(--studio-mist);
  --btn-fg: var(--studio-leaf);
  --btn-inner-border: var(--rule);
  --btn-shadow: var(--studio-control-shadow);
  background-image: none;
}
.button.quiet:not(:disabled, [aria-disabled="true"]):is(:hover, :focus-visible) {
  --btn-bg: var(--studio-leaf-wash);
  --btn-border: var(--studio-leaf);
  --btn-inner-border: var(--studio-leaf-wash);
  --btn-fg: var(--studio-leaf);
  --btn-shadow: var(--studio-control-shadow);
}
.button.ghost, .button.danger {
  --btn-inner-border: transparent;
  --btn-shadow: none;
  background-image: none;
}
.button.ghost:not(:disabled, [aria-disabled="true"]):is(:hover, :focus-visible) { --btn-bg: var(--sunk); --btn-fg: var(--ink); --btn-shadow: none; }
.button.danger:not(:disabled, [aria-disabled="true"]):is(:hover, :focus-visible) { --btn-bg: var(--red-wash); --btn-fg: var(--red); --btn-shadow: none; }
.button.destructive:not(:disabled, [aria-disabled="true"]):is(:hover, :focus-visible) { --btn-bg: color-mix(in srgb, var(--red) 88%, var(--ink)); }
.button:is(.quiet, .ghost, .danger)::after { content: none; }
.button:is(:disabled, [aria-disabled="true"]) {
  --btn-bg: var(--sunk);
  --btn-fg: var(--ink-mute);
  --btn-border: var(--rule);
  --btn-inner-border: transparent;
  background-image: none;
  box-shadow: none;
}
.button:is(:disabled, [aria-disabled="true"])::after { content: none; }
.button[aria-disabled="true"]:is(:hover, :active) { --btn-bg: var(--sunk); --btn-border: var(--rule); --btn-fg: var(--ink-mute); transform: none; }
.button-entry { justify-content: space-between; gap: 24px; min-width: 164px; }
.button-label { position: relative; }
.button-trailing {
  display: grid;
  place-items: center;
  flex: 0 0 30px;
  width: 30px;
  height: 30px;
  border: 1px solid var(--studio-button-border);
  border-radius: 50%;
  background: var(--studio-button-light);
}
.button-trailing .icon { width: 17px; height: 17px; transition: transform .2s var(--ease); }
.button-entry:not(:disabled, [aria-disabled="true"]):is(:hover, :focus-visible) .button-trailing .icon { transform: translateX(2px); }
.button.small { border-radius: 6px; }
:where(input:not([type="checkbox"], [type="radio"], [type="hidden"], [type="file"], [type="range"], [type="color"], [type="button"], [type="submit"], [type="reset"], [data-grid-cell]), textarea, select) {
  border-radius: 6px;
  background-color: var(--studio-input);
  box-shadow: inset 0 1px 2px var(--rule);
  caret-color: var(--accent);
}
:where(input:not([type="checkbox"], [type="radio"], [type="hidden"], [type="file"], [type="range"], [type="color"], [type="button"], [type="submit"], [type="reset"], [data-grid-cell]), textarea, select):hover:not(:disabled, :focus, [readonly], [aria-invalid="true"]) { border-color: var(--studio-input-hover); }
:where(input:not([type="checkbox"], [type="radio"], [type="hidden"], [type="file"], [type="range"], [type="color"], [type="button"], [type="submit"], [type="reset"], [data-grid-cell]), textarea, select):focus {
  background-color: var(--sheet);
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-ring), var(--studio-control-shadow);
}
:where(input, textarea, select):disabled, :where(input, textarea)[readonly] { background-color: var(--sunk); box-shadow: none; }
.form-field:has(.errorlist) :is(input, textarea, select), :where(input, textarea, select)[aria-invalid="true"] { border-color: var(--studio-error-rule); }
.form-field:has(.errorlist) :is(input, textarea, select):focus, :where(input, textarea, select)[aria-invalid="true"]:focus { box-shadow: 0 0 0 3px var(--studio-error-ring); }
:where(input, textarea)::placeholder { color: var(--ink-mute); opacity: 1; }
.form-stack { gap: 22px; }
.form-field > label { margin-bottom: 8px; }
.page-head { padding-bottom: 24px; border-bottom: 1px solid var(--rule); }
.page-head h1 { font-size: 2rem; line-height: 1.2; }
.page-head .eyebrow { color: var(--studio-leaf); }
.page-head--stack { gap: 22px; padding-bottom: 0; border-bottom: 0; }
.section-head { margin-bottom: 18px; }
.list, .assignment-list, .student-roster { border-top-color: var(--rule); border-bottom-color: var(--rule); }
.row--link::before {
  content: "";
  position: absolute;
  inset: 16px auto 16px 0;
  width: 2px;
  background: var(--studio-leaf);
  transform: scaleY(0);
  transition: transform .18s var(--ease);
}
.row--link:hover, .row--link:focus-within { background: var(--studio-mist); }
.row--link:hover::before, .row--link:focus-within::before { transform: scaleY(1); }
.row-title { line-height: 1.45; }
.row-kicker { gap: 6px 8px; }
.badge { border-radius: 5px; background: var(--accent-wash); }
.chip, .status { border-radius: 5px; }
thead th { background: var(--studio-mist); color: var(--ink-body); padding-block: 14px; }
tbody tr:hover > :is(th,td) { background: var(--studio-mist); }
.table-scroll { border-color: var(--rule-strong); }
.essay-entry summary { gap: 14px; }
.essay-entry summary:hover, .essay-entry[open] > summary { background: var(--studio-mist); }
.teacher-note summary, .roster-code summary { border-radius: 6px; }
.teacher-note[open] > summary, .roster-code[open] > summary { color: var(--studio-leaf); background: var(--studio-leaf-wash); }
.kind-switch { flex-wrap: wrap; }
.kind-switch a { min-width: max-content; text-align: center; }
.kind-switch a[aria-current="page"] { color: var(--studio-leaf); }
.assignment-create > summary.button { justify-content: flex-start; }
.assignment-create[open] > summary.button > .icon { transform: rotate(45deg); }
.assignment-create > summary.button > .icon { transition: transform .2s var(--ease); }
.listen { gap: 18px; padding: 18px 22px 18px 14px; border-color: var(--rule-strong); background: var(--studio-input); }
.listen[data-state="playing"] { border-color: var(--studio-leaf); background: var(--studio-mist); box-shadow: var(--studio-shadow); }
.listen-status { font-size: 1rem; font-weight: 600; }
.listen-progress { height: 4px; margin-block: 12px 10px; overflow: hidden; border-radius: 2px; background: var(--rule-strong); }
.listen-progress-fill { display: block; width: 100%; height: 100%; background: var(--studio-leaf); transform: scaleX(0); transform-origin: left center; }
.listen-meta { margin-top: 0; gap: 6px 16px; }
.listen-time { display: flex; gap: 6px; align-items: baseline; font: 400 .8125rem/1.4 var(--mono); }
.listen-time [data-listen-elapsed] { color: var(--ink); font-size: 1rem; font-weight: 600; }
.listen-ring-track { stroke: var(--rule-strong); }
.listen-ring-fill { stroke: var(--studio-leaf); }
.listen[data-state="playing"] .listen-button::before { background: var(--studio-leaf-wash); }
.listen[data-state="playing"] .listen-button { color: var(--studio-leaf); }
.listen-dots i { width: 7px; height: 7px; border-color: var(--studio-leaf); }
.listen-dots i.is-left { background: var(--studio-leaf); }
.listen[data-state="error"] .listen-progress-fill { background: var(--red); }
.listen[data-state="done"] .listen-progress-fill { background: var(--ink-faint); }
.listen.is-motion-paused .listen-glyph.is-wave i { animation-play-state: paused; }
.listen-preview { background: var(--studio-input); border-color: var(--rule-strong); }
.deadline-controls { gap: 16px; }
.confirm-dialog, .correction-popover { border-color: var(--rule-strong); box-shadow: var(--studio-shadow); }
.form-page { max-width: 580px; padding-top: 12px; }
.form-page > h1 { padding-bottom: 20px; border-bottom: 1px solid var(--rule); }
.studio-colophon { flex: 0 0 auto; border-top: 1px solid var(--rule); }
.studio-colophon-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  max-width: calc(var(--page) + 2 * var(--gutter));
  margin: 0 auto;
  padding: 20px var(--gutter);
  color: var(--ink-mute);
  font-size: .75rem;
}
.studio-colophon-inner > :first-child { color: var(--ink-body); font-weight: 650; }

/* The entrance is a workbench, not a stack of promotional cards. */
main.studio-main { display: flex; flex-direction: column; max-width: none; padding: 0; }
.studio-home { display: flex; flex: 1; flex-direction: column; animation: none; }
.studio-main > .messages { max-width: calc(var(--page) + 2 * var(--gutter)); margin: 24px auto 0; padding-inline: var(--gutter); }
.studio-masthead, .studio-workbench {
  width: 100%;
  max-width: calc(var(--page) + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.studio-masthead {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  padding-block: 40px 28px;
}
.studio-index { display: flex; align-items: center; gap: 10px; margin: 0 0 10px; color: var(--studio-leaf); font-size: .8125rem; font-weight: 550; }
.studio-index-line { width: 28px; height: 1px; background: var(--studio-leaf); }
.studio-masthead h1 { margin: 0; color: var(--ink); font-size: 3rem; font-weight: 650; line-height: 1.15; letter-spacing: 0; }
.studio-workbench {
  flex: 1;
  grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
  gap: 72px;
  min-height: 360px;
  padding-block: 28px 52px;
  border: 0;
}
.studio-workbench .join-panel { padding-block: 24px; }
.studio-workbench .eyebrow { color: var(--ink-mute); margin-bottom: 12px; }
.studio-workbench #join-title { margin: 0 0 24px; font-size: 1.75rem; font-weight: 600; line-height: 1.3; }
.studio-workbench .form-stack { grid-template-columns: minmax(0,1fr) auto; gap: 12px; }
.studio-workbench #class-code { min-height: 54px; padding: 15px 16px; background-color: var(--studio-input); }
.studio-workbench #class-code:focus { background-color: var(--sheet); }
.studio-workbench #class-code:is(:disabled, [readonly]) { background-color: var(--sunk); }
.studio-workbench .button { min-height: 54px; width: auto; padding: 10px 12px 10px 22px; }
.studio-workbench .join-sheet { position: relative; width: 100%; padding-block: 12px; }
.studio-folio { display: flex; justify-content: space-between; gap: 16px; margin: 0 4px 16px; color: var(--ink-mute); font: 400 .75rem/1.5 var(--mono); }
.studio-folio > :first-child { font-family: var(--serif); font-style: italic; font-size: .875rem; }
.studio-workbench .sheet-ruled { --lh: 2.25rem; font-size: 1.25rem; box-shadow: var(--studio-shadow); border-color: var(--rule-strong); }
.studio-workbench .sheet-title { font-size: 1.375rem; }
.studio-ribbon { padding-block: 18px 24px; border-block: 1px solid var(--rule); background: var(--studio-mist); overflow: clip; }
.studio-word-window { --studio-word-size: 1.625rem; overflow: hidden; padding-block: calc(var(--studio-word-size) * 1.1) 8px; }
.studio-word-track { display: flex; width: max-content; }
.studio-word-group { display: flex; flex: 0 0 auto; align-items: baseline; gap: 14px; padding-inline: 14px; color: var(--studio-leaf); font: 400 var(--studio-word-size)/1.35 var(--serif); }
.studio-word-group > span:nth-of-type(even) { color: var(--ink-body); font-style: italic; }
.studio-word-group i { color: var(--ink-faint); font-size: .75rem; font-style: normal; }
.studio-word { position: relative; flex: 0 0 auto; }
.studio-word-text { display: inline-block; }
.studio-word-error { position: absolute; inset: 0; text-align: center; white-space: nowrap; visibility: hidden; }
.studio-word-error::after {
  content: "";
  position: absolute;
  top: 56%;
  left: -2%;
  width: 104%;
  height: 1.5px;
  background: var(--red);
  transform: rotate(-5deg) scaleX(0);
  transform-origin: left center;
}
.studio-word.is-correcting .studio-word-error { visibility: visible; }
.studio-word.is-correcting .studio-word-text {
  color: var(--red);
  transform: translateY(-1.05em) scale(.82);
  animation: studio-word-note .55s var(--ease) both;
}
.studio-word.is-correcting .studio-word-error::after { animation: studio-word-strike .4s .15s var(--ease) both; }

@media (prefers-reduced-motion: no-preference) {
  .listen[data-state="playing"]:not(.is-motion-paused) .listen-progress-fill { transition: transform .12s linear; }
  .button:not(:disabled, [aria-disabled="true"]):is(:hover, :focus-visible)::after { transform: translateX(130%); transition: transform .65s var(--ease); }
  .button:not(:disabled, [aria-disabled="true"]):is(:hover, :focus-visible) { transform: translateY(-1px); }
  .button:not(:disabled, [aria-disabled="true"]):active { transform: translateY(1px); --btn-shadow: var(--studio-control-shadow); }
  .studio-motion-enabled .studio-word-track { animation: studio-words 120s linear infinite; }
  .studio-motion-enabled .join-sheet { animation: studio-paper 9s ease-in-out infinite; }
  .is-motion-paused .studio-word-track, .join-sheet.is-motion-paused { animation-play-state: paused; }
  .teacher-note[open] .teacher-note-content, .essay-entry[open] .essay-entry-body,
  .roster-code[open] .roster-code-body { animation: studio-detail-in .2s var(--ease); }
}
@keyframes studio-words { to { transform: translateX(-50%); } }
@keyframes studio-paper { 0%,100% { transform: translateY(0) rotate(-.45deg); } 50% { transform: translateY(-4px) rotate(.15deg); } }
@keyframes studio-detail-in { from { opacity: .35; } to { opacity: 1; } }
@keyframes studio-word-note { from { opacity: 0; transform: translateY(-.7em) scale(.82); } to { opacity: 1; transform: translateY(-1.05em) scale(.82); } }
@keyframes studio-word-strike { to { transform: rotate(-5deg) scaleX(1); } }
@media (prefers-reduced-motion: reduce) {
  .studio-word-track, .studio-workbench .join-sheet { animation: none !important; transform: none; }
  .studio-word-window { overflow: auto; }
  .row--link::before { transition: none; }
  .button, .button-trailing .icon { transition: none; }
  .button::after { content: none; }
  .button:active, .button-entry:is(:hover, :focus-visible) .button-trailing .icon { transform: none; }
  .listen-glyph.is-wave i { animation: none; }
  .studio-word.is-correcting .studio-word-text { color: inherit; font-style: inherit; transform: none; animation: none; }
  .studio-word.is-correcting .studio-word-error { visibility: hidden; }
}

@media (min-width: 1600px) {
  .studio-masthead { padding-top: 48px; }
  .studio-workbench { min-height: 390px; padding-bottom: 60px; }
}
@media (max-width: 1100px) {
  :root { --gutter: 32px; }
  .studio-workbench { gap: 40px; grid-template-columns: minmax(0,.9fr) minmax(0,1.1fr); }
  .studio-workbench .form-stack { grid-template-columns: minmax(0,1fr); }
  .studio-workbench .button { width: 100%; }
  .studio-workbench .sheet-ruled { font-size: 1.125rem; }
  .studio-masthead h1 { font-size: 2.625rem; }
}
@media (max-width: 860px) {
  :root { --gutter: 24px; }
  .studio-workbench { grid-template-columns: minmax(0,1fr); gap: 24px; min-height: 0; padding-block: 12px 36px; }
  .studio-workbench .join-panel { padding-block: 12px; }
  .studio-workbench .form-stack { grid-template-columns: minmax(0,1fr) auto; }
  .studio-workbench .button { width: auto; }
  .studio-workbench .sheet-ruled { font-size: 1.25rem; }
  .studio-masthead { padding-block: 32px 20px; }
}
@media (max-width: 640px) {
  :root { --gutter: 20px; }
  main { padding-block: 28px 40px; }
  .topbar-inner { min-height: 76px; padding-block: 12px; }
  .brand-name { font-size: .9375rem; }
  .brand-product { font-size: .625rem; }
  .topnav { flex-wrap: wrap; gap: 4px; }
  .topnav a, .topnav button { padding-inline: 10px; }
  .topnav .nav-login { width: 44px; padding: 0; justify-content: center; }
  .nav-login-label { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
  .studio-masthead { flex-wrap: wrap; align-items: flex-start; gap: 14px; padding-block: 28px 16px; }
  .studio-masthead h1 { font-size: 2rem; font-weight: 650; }
  .studio-index { font-size: .75rem; margin-bottom: 10px; }
  .studio-workbench { gap: 20px; padding-bottom: 28px; }
  .studio-workbench #join-title { font-size: 1.5rem; margin-bottom: 18px; }
  .studio-workbench .form-stack { grid-template-columns: minmax(0,1fr); gap: 10px; }
  .studio-workbench .button { width: 100%; min-height: 54px; }
  .studio-workbench #class-code { min-height: 54px; padding: 14px; font-size: 1rem; }
  .studio-workbench .sheet-ruled { font-size: 1.0625rem; --lh: 2rem; }
  .studio-workbench .sheet-title { font-size: 1.125rem; }
  .studio-folio { margin-bottom: 12px; font-size: .625rem; }
  .studio-folio > :first-child { font-size: .75rem; }
  .studio-ribbon { padding-block: 12px 18px; }
  .studio-word-window { --studio-word-size: 1.25rem; }
  .studio-word-group { gap: 12px; padding-inline: 12px; }
  .studio-colophon-inner { padding-block: 16px; font-size: .6875rem; gap: 8px 16px; }
  .studio-colophon-inner > :last-child { width: 100%; font-size: .625rem; }
  .listen { gap: 12px; padding: 14px 12px 14px 8px; }
  .listen-meta { gap: 6px 10px; }
  .listen-rights { font-size: .75rem; }
}
@media (max-width: 360px) {
  :root { --gutter: 16px; }
  .studio-masthead h1 { font-size: 1.8125rem; }
  .brand-product { font-size: .6rem; }
  .topbar-inner { gap: 10px; }
}