.chalk-studio {
  --bg: var(--board);
  --ink: var(--chalk);
  --green: var(--chalk-mint);
  --line: var(--chalk-border);
  --muted: var(--chalk-muted);
  --orange: var(--chalk-yellow);
  font: 700 1rem/1.5 var(--chalk-font);
}
.chalk-studio [hidden] { display: none !important; }
.chalk-studio .studio-header { margin-inline: auto; border-color: var(--line); padding-inline: clamp(1.1rem, 4vw, 3rem); }
.chalk-studio main { max-width: 1200px; }
.chalk-studio h1, .chalk-studio h2, .chalk-studio h3, .chalk-studio .term,
.chalk-studio :is(.activity-heading, .oral-heading, .paragraph-heading, .activity-prompt) {
  font-family: var(--chalk-font);
  font-weight: 1000;
}
.chalk-studio :is(.panel, dialog, .family-gate section) {
  background: var(--board-raised);
  color: var(--chalk);
  border: 1px dashed var(--chalk-border);
  border-radius: 1rem;
  box-shadow: 0 5px 20px #11192332;
}
.chalk-studio .panel { padding: clamp(1.3rem, 4vw, 2.8rem); min-height: 380px; overflow-wrap: anywhere; }
.chalk-studio :is(label, legend) { color: var(--chalk); font-weight: 850; }
.chalk-studio :is(input, select, textarea) {
  box-sizing: border-box;
  max-width: 100%;
  min-width: 0;
  background: #1d2932;
  color: var(--chalk);
  border: 1px solid #687683;
  border-radius: 0.65rem;
  font: inherit;
}
.chalk-studio :is(input, select, textarea)::placeholder { color: #c0b9af; }
.chalk-studio :is(input[readonly], kbd) { background: #22303a; color: var(--chalk); }
.chalk-studio input[type="radio"], .chalk-studio input[type="checkbox"] { width: auto; accent-color: var(--chalk-mint); }
.chalk-studio :is(input, select, textarea)[aria-invalid="true"] { border-color: var(--chalk-pink); }
.chalk-studio .direction-setting, .chalk-studio .subject-setting, .chalk-studio .activity-setting { margin: 0; }
.chalk-studio :is(.primary, .family-primary) {
  min-height: 2.7rem;
  width: fit-content;
  max-width: 100%;
  padding: 0.65rem 1.2rem;
  border: 1px solid transparent;
  border-radius: 999px;
  background: var(--chalk-yellow);
  color: var(--chalk-ink);
  font-family: var(--chalk-font);
  font-weight: 950;
}
.chalk-studio :is(.word-list-button, .family-signout, .password-field button) {
  border: 1px solid #94b7a9;
  color: var(--chalk-mint);
  background: transparent;
  font-weight: 850;
}
.chalk-studio button:disabled { cursor: not-allowed; opacity: 0.55; }
.chalk-studio .studio-tools { display: flex; flex-wrap: wrap; gap: 0.55rem; align-items: center; }
.chalk-studio .round-tools { margin-top: 1.3rem; }
.chalk-studio .progress { background: #475763; }
.chalk-studio .progress > div { background: var(--chalk-mint); }
.chalk-studio :is(.status, .category, .list-hint, small, .family-note) { color: var(--chalk-muted); }
.chalk-studio .score, .chalk-studio .right { color: var(--chalk-mint); }
.chalk-studio .score span { color: var(--chalk-muted); font-size: 1.75rem; }
.chalk-studio :is(.miss, .error, #family-message) { color: var(--chalk-pink); }
.chalk-studio :is(.activity-review .miss, .correction del, .oral-correction del) { color: var(--chalk-pink); }
.chalk-studio :is(.feedback, .oral-feedback) { background: #253e39; color: var(--chalk); border: 1px solid #5a8b7a; }
.chalk-studio .feedback.wrong { background: #45393a; color: var(--chalk); border-color: #a77573; }
.chalk-studio :is(.activity-example, .passage, .paragraph-result, .paragraph-sentence, .grammar-choice,
  .activity-review, .oral-record-box, .oral-question, .oral-review-item, .oral-metric, .oral-transcript, .oral-tip, .oral-correction) {
  background: #22303a;
  color: var(--chalk);
  border-color: var(--chalk-border);
}
.chalk-studio :is(.grammar-choice:hover, .grammar-choice:has(input:checked)) { background: #30473e; }
.chalk-studio :is(.grammar-choice.correct, .correct-choice) { background: #28463c; }
.chalk-studio :is(.grammar-choice.incorrect, .incorrect-choice) { background: #483837; }
.chalk-studio .oral-record-box.recording { background: #45393a; }
.chalk-studio :is(.word-list-header, .paste-heading) { background: var(--board-raised); }
.chalk-studio dialog::backdrop { background: #0b111cba; }
.chalk-studio .word-list-header { flex-wrap: wrap; }
.chalk-studio .card-review { border-top: 1px solid var(--line); padding: 0.85rem 0; }
.chalk-studio .card-review p { margin: 0.2rem 0; }

.chalk-studio .family-gate { width: min(100%, 530px); margin: 1.9rem auto; padding: 0 1rem; }
.chalk-studio .family-gate section { padding: clamp(1.4rem, 4vw, 2rem); }
.chalk-studio .family-gate h1 { margin-top: 0; }
.chalk-studio .family-primary { margin-top: 1rem; }
.chalk-studio .password-field { gap: 0.55rem; }

.chalk-studio .paste-dialog { width: min(720px, calc(100% - 1.4rem)); max-height: calc(100dvh - 1.5rem); padding: 0 1.5rem 1.5rem; }
.paste-heading { position: sticky; top: 0; z-index: 2; display: flex; justify-content: space-between; gap: 1rem; align-items: center; padding: 1rem 0; margin-bottom: 0.65rem; }
.paste-heading h2 { margin: 0; font-size: clamp(1.45rem, 3.5vw, 2rem); }
.paste-dialog textarea { width: 100%; padding: 0.68rem 0.75rem; resize: vertical; }
.paste-languages { display: grid; grid-template-columns: 1fr 1fr; gap: 0.8rem; }
.list-hint, .list-status { margin: 0.35rem 0 0.75rem; font-size: 0.91rem; }
.list-status:empty { display: none; }
.review-meaning { display: grid; grid-template-columns: minmax(0, 0.75fr) minmax(0, 1fr); gap: 0.25rem 0.8rem; border-top: 1px solid var(--line); padding: 0.7rem 0; align-items: start; }
.review-meaning label { margin: 0.4rem 0 0; overflow-wrap: anywhere; }
.review-note { grid-column: 1 / -1; margin: 0.15rem 0; color: var(--chalk-yellow); }
.review-list-actions { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 0.65rem; margin-top: 0.6rem; }

@media (max-width: 430px) {
  .paste-languages, .review-meaning { grid-template-columns: 1fr; }
  .chalk-studio .paste-dialog { padding-inline: 0.9rem; }
  .paste-heading { gap: 0.45rem; }
}

.study-page {
  --study-gutter: clamp(1rem, 3.3vw, 3.25rem);
  --study-field-size: clamp(1rem, 1.55vw, 1.5rem);
  --study-outline: clamp(2px, 0.19vw, 3px);
  min-height: 100dvh;
  background-image: radial-gradient(ellipse at 75% 4%, #303c47 0%, transparent 45%),
    radial-gradient(circle at center, #ffffff09 0.65px, transparent 0.85px);
  background-repeat: no-repeat, repeat;
}
.study-page :is(.studio-header, main) {
  max-width: 100rem;
  padding-inline: var(--study-gutter);
}
.study-page .studio-header {
  border: 0;
  padding-block: clamp(0.8rem, 1.05vw, 1.1rem);
}
.study-page .studio-header .chalk-brand { font-size: clamp(1.2rem, 2.65vw, 2.6rem); }
.study-page .header-actions { gap: clamp(0.65rem, 2.5vw, 2.6rem); }
.study-page .header-actions button {
  min-height: 2.75rem;
  color: var(--chalk);
  font-size: var(--study-field-size);
  font-weight: 950;
  line-height: 1.2;
  white-space: nowrap;
}
.study-page .header-actions .word-list-button {
  min-height: clamp(2.75rem, 3.35vw, 3.35rem);
  border: 2px solid var(--chalk-mint);
  border-radius: 1rem;
  padding: 0.45rem clamp(0.65rem, 1.75vw, 1.8rem);
}
.study-page .header-actions .family-signout { border: 0; padding: 0.4rem 0; }

.board-empty h2 { margin: 0 0 0.45rem; font-size: clamp(1.4rem, 3vw, 2.1rem); }
.board-empty p { margin: 0 0 1rem; }

.study-page main { padding-block: 0.2rem clamp(1.5rem, 3vw, 3rem); }
.study-page .intro { text-align: left; margin-bottom: clamp(1.25rem, 1.85vw, 1.85rem); }
.study-page .intro h1 {
  margin: 0 0 0.55rem;
  font-size: clamp(2.2rem, 4.55vw, 4.55rem);
  line-height: 1.07;
  letter-spacing: -0.025em;
  overflow-wrap: anywhere;
}
.study-page .intro h1 span {
  text-decoration: underline 0.085em var(--chalk-lilac);
  text-underline-offset: 0.16em;
  text-decoration-skip-ink: none;
}
.study-page .intro p {
  margin: 0;
  max-width: none;
  color: var(--chalk);
  font-size: clamp(1rem, 1.92vw, 1.9rem);
  font-weight: 800;
  line-height: 1.25;
}
.study-page .layout {
  grid-template-columns: minmax(14rem, 26.6%) minmax(0, 1fr);
  gap: clamp(1rem, 2.35vw, 2.4rem);
}

.study-page .study-settings {
  display: block;
  min-width: 0;
  padding: clamp(1rem, 1.4vw, 1.45rem) clamp(1rem, 1.8vw, 1.85rem) clamp(1.15rem, 2.5vw, 2.5rem);
  background: #303845;
  border: 2px dashed var(--chalk-lilac);
  border-radius: 1.2rem;
  box-shadow: none;
}
.study-settings > h2 {
  margin: 0 0 clamp(1rem, 1.65vw, 1.65rem);
  font-size: clamp(1.4rem, 2.35vw, 2.3rem);
  line-height: 1.15;
  letter-spacing: -0.025em;
}
#study-settings-toggle { display: none; }
.study-settings-fields { display: grid; gap: clamp(0.75rem, 1.05vw, 1.05rem); }
.study-page .study-settings label {
  margin: 0 0 0.45rem;
  font-size: var(--study-field-size);
  font-weight: 950;
  line-height: 1.2;
}
.study-page .study-settings select {
  appearance: none;
  min-height: clamp(2.75rem, 3.2vw, 3.2rem);
  padding: 0.4rem 2.35rem 0.4rem 1rem;
  background-color: #2b3440;
  background-image:
    linear-gradient(45deg, transparent 39%, var(--chalk) 39% 63%, transparent 63%),
    linear-gradient(135deg, transparent 39%, var(--chalk) 39% 63%, transparent 63%);
  background-position: right 1.27rem center, right 0.85rem center;
  background-repeat: no-repeat;
  background-size: 0.45rem 0.45rem;
  border: var(--study-outline) solid var(--chalk);
  border-radius: 0.75rem;
  font-size: var(--study-field-size);
  font-weight: 900;
  line-height: 1.2;
}
.study-page .study-settings select:disabled { opacity: 1; cursor: default; }
.study-page .study-settings .word-list-button {
  border: var(--study-outline) solid var(--chalk);
  border-radius: 0.8rem;
  color: var(--chalk);
  font-weight: 950;
  line-height: 1.2;
}
.study-page #open-paste-list {
  width: fit-content;
  min-height: 2.65rem;
  margin: 0.8rem 0 0;
  padding: 0.4rem clamp(0.8rem, 1.5vw, 1.5rem);
  font-size: clamp(0.93rem, 1.3vw, 1.25rem);
}
.study-page .study-settings .restart {
  width: 100%;
  grid-row: auto;
  min-height: clamp(2.75rem, 3.45vw, 3.45rem);
  margin: clamp(0.5rem, 2.2vw, 2.2rem) 0 0;
  font-size: var(--study-field-size);
}

.study-page .panel:has(> .flashcard-round) {
  min-height: 0;
  padding: 0;
  background: transparent;
  border: 0;
  box-shadow: none;
}
.flashcard-round { --card-inset: clamp(0rem, 0.85vw, 0.85rem); }
.flashcard-round > :is(.status, .progress, form) { margin-inline: var(--card-inset); }
.study-page .flashcard-round .status {
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.25rem 0.75rem;
  color: var(--chalk);
  font: 950 clamp(1rem, 1.75vw, 1.75rem)/1.25 var(--chalk-font);
}
.flashcard-round .progress {
  height: clamp(0.52rem, 1vw, 1rem);
  margin-block: 0.75rem clamp(1rem, 1.85vw, 1.85rem);
}
.flashcard-round .progress > div { border-radius: inherit; }
.flashcard-paper {
  display: grid;
  grid-template-columns: minmax(0, 1fr) clamp(5rem, 14vw, 14rem);
  align-items: center;
  gap: clamp(0.5rem, 1.6vw, 1.6rem);
  min-height: clamp(10rem, 17vw, 16.85rem);
  padding: clamp(0.85rem, 1.45vw, 1.45rem) clamp(1rem, 2.8vw, 2.8rem);
  background-color: #fff1d9;
  background-image: radial-gradient(circle at center, #9b6b3b17 0.6px, transparent 0.85px);
  background-size: 8px 8px;
  border-radius: clamp(1.1rem, 2vw, 2rem);
  color: var(--chalk-ink);
}
.flashcard-doodle {
  display: block;
  width: 100%;
  height: auto;
  transform: translateX(clamp(0rem, 0.55vw, 0.6rem)) scale(1.1);
}
.flashcard-round .flashcard-instruction {
  margin: 0;
  font-size: clamp(1.1rem, 2.15vw, 2.1rem);
  font-weight: 1000;
  line-height: 1.2;
}
.study-page .flashcard-round .flashcard-paper .category {
  margin: 0 0 0.6rem;
  color: #60516a;
  font-size: clamp(0.75rem, 1vw, 1rem);
  font-weight: 900;
}
.study-page .flashcard-round .term {
  margin: clamp(0.55rem, 1.2vw, 1.2rem) 0 0.28em;
  color: var(--chalk-ink);
  font-size: clamp(2.25rem, 5.75vw, 5.75rem);
  line-height: 1.04;
  letter-spacing: -0.03em;
  text-decoration: underline 0.085em var(--chalk-lilac);
  text-underline-offset: 0.19em;
  text-decoration-skip-ink: none;
}
.flashcard-round form {
  max-width: none;
  margin-block-start: clamp(1rem, 1.55vw, 1.55rem);
}
.study-page .flashcard-round label { font-size: var(--study-field-size); font-weight: 950; }
.study-page .flashcard-round input {
  min-height: clamp(3rem, 4.45vw, 4.45rem);
  padding: 0.5rem clamp(0.8rem, 1.45vw, 1.5rem);
  background: #26323e;
  border: var(--study-outline) solid var(--chalk);
  border-radius: 1rem;
  font-size: clamp(1rem, 1.95vw, 1.95rem);
  font-weight: 850;
}
.flashcard-round .error:empty { display: none; }
.study-page .flashcard-round .feedback {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.15rem clamp(0.65rem, 2.1vw, 2.1rem);
  margin-top: clamp(0.75rem, 1.3vw, 1.3rem);
  padding: 0.44em clamp(0.85rem, 1.65vw, 1.65rem);
  background: #2a403c;
  border: 2px dashed var(--chalk-mint);
  border-radius: 1rem;
  font-size: clamp(1rem, 1.75vw, 1.75rem);
}
.study-page .flashcard-round .feedback.wrong { background: #373843; border-color: var(--chalk-pink); }
.flashcard-round .feedback strong { font-weight: 1000; }
.flashcard-round .feedback p { margin: 0; min-width: 0; }
.study-page .flashcard-round #submit-card {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  min-height: clamp(2.85rem, 4.6vw, 4.6rem);
  margin-top: clamp(1rem, 1.85vw, 1.85rem);
  padding: 0.45rem clamp(1.2rem, 2.3vw, 2.3rem);
  font-size: clamp(1.1rem, 2.15vw, 2.15rem);
  line-height: 1.2;
  font-weight: 1000;
}
#submit-card[type="button"]::after { content: "→" / ""; font-size: 1.1em; }

@media (max-width: 760px) {
  .study-page .studio-header { flex-wrap: wrap; gap: 0.6rem; }
  .study-page .header-actions { flex-wrap: nowrap; gap: 0.55rem; margin-inline-start: auto; }
  .study-page .header-actions button { font-size: 0.85rem; }
  .study-page .header-actions .word-list-button { border-radius: 0.75rem; }
  .study-page main { padding-block-start: 0.75rem; }
  .study-page .study-settings { padding: 0.15rem 0.9rem; }
  .study-settings > h2 { display: none; }
  #study-settings-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    width: 100%;
    min-height: 2.75rem;
    padding: 0.4rem 0;
    border: 0;
    background: transparent;
    color: var(--chalk);
    font-size: 1.1rem;
    font-weight: 950;
    text-align: start;
  }
  #study-settings-toggle::after {
    content: "";
    flex: 0 0 0.5rem;
    height: 0.5rem;
    margin-inline-end: 0.25rem;
    border: solid var(--chalk-lilac);
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
  }
  #study-settings-toggle[aria-expanded="true"]::after { transform: rotate(225deg); }
  #study-settings-toggle[aria-expanded="false"] + .study-settings-fields { display: none; }
  .study-settings-fields { grid-template-columns: repeat(2, minmax(0, 1fr)); padding: 0.5rem 0 0.9rem; }
  .study-settings-fields > :is(.list-setting, .direction-setting, .topic-setting, .restart) { grid-column: 1 / -1; }
  .study-page .study-settings select { padding-inline-start: 0.65rem; }
  .flashcard-round { --card-inset: 0rem; }
  .flashcard-paper { grid-template-columns: minmax(0, 1fr) clamp(3.65rem, 15vw, 6.5rem); }
  .study-page .flashcard-round .term { font-size: clamp(2rem, 8.9vw, 3.75rem); }
}
@media (max-width: 360px) {
  .study-page .studio-header .chalk-brand { font-size: 1.08rem; }
  .study-page .header-actions { gap: 0.45rem; }
  .study-page .header-actions button { font-size: 0.8rem; }
  .study-page .header-actions .word-list-button { padding-inline: 0.5rem; }
}
@media (prefers-reduced-motion: reduce) {
  .study-page .progress > div { transition: none; }
}

.account-sync-status { margin: 0 0 1rem; color: var(--chalk-mint); }
.account-sync-status button { margin-inline-start: 0.6rem; }
.study-page #open-import { margin-top: 0.65rem; padding: 0.35rem 0.55rem; font-size: 0.9rem; }
.chalk-studio #browser-import { width: min(38rem, calc(100% - 2rem)); padding: 1.25rem; }
#browser-import form > label, #browser-import-lists label {
  display: flex;
  gap: 0.65rem;
  align-items: baseline;
  font-weight: 700;
}
#browser-import fieldset { margin: 0 0 1rem; border: 1px solid var(--chalk-border); border-radius: 0.6rem; }
#browser-import-message { color: var(--chalk-mint); }
.study-page #account-name { max-width: 12ch; overflow: hidden; text-overflow: ellipsis; }