.study-page { background: var(--bg); }
.study-page .container { max-width: 1080px; }
.study-page .topbar { padding-bottom: 20px; border-bottom: 1px solid var(--border); }
.study-page .nav .download-link { background: var(--action-bg); color: var(--action-text); }
.study-heading { margin: 36px 0 28px; }
.study-heading h1 { font-size: 32px; line-height: 1.3; }
.study-heading p, .app-invitation p { color: var(--muted); }
.study-workspace { padding-bottom: 24px; border-bottom: 1px solid var(--border); }
.study-page label { font-size: 14px; font-weight: 700; }
.language-pair { display: grid; grid-template-columns: minmax(0, 1fr) 44px minmax(0, 1fr); align-items: end; gap: 16px; margin-bottom: 24px; }
.language-pair label { display: grid; gap: 6px; min-width: 0; }
.study-page select, .study-page textarea { font: inherit; color: var(--text); border: 1px solid var(--border); border-radius: 6px; background: var(--surface-strong); }
.study-page select { width: 100%; min-height: 44px; padding: 8px 12px; }
.study-page .language-switch { width: auto; min-height: 44px; }
.study-page textarea { display: block; width: 100%; min-height: 152px; padding: 16px; resize: vertical; font-size: 20px; line-height: 1.6; }
.study-page textarea::placeholder { color: var(--muted); opacity: 1; }
.input-heading, .input-footer, .result-heading, .word-heading, .export-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.input-heading { margin-bottom: 6px; }
.input-tools, .workspace-actions, .result-heading > div { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.input-footer { margin-top: 14px; flex-wrap: wrap; }
.workspace-actions { align-items: stretch; }
.workspace-actions button { min-height: 48px; }
#character-count, #selection-count { color: var(--muted); font-size: 13px; font-variant-numeric: tabular-nums; }
.study-page button { min-height: 44px; display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 9px 14px; border: 1px solid var(--border); border-radius: 6px; color: var(--text); background: var(--surface-strong); font: inherit; font-size: 14px; font-weight: 700; cursor: pointer; }
.study-page button:disabled { opacity: .5; cursor: default; }
.study-page button.primary { background: var(--action-bg); color: var(--action-text); border-color: var(--action-bg); }
.study-page button.secondary { color: var(--blue); border-color: var(--blue); }
.study-page button.icon-button { width: 44px; height: 44px; padding: 10px; flex: 0 0 44px; }
.icon-button > span { display: none; }
.icon { width: 20px; height: 20px; flex: 0 0 20px; }
.study-page button.text-button { background: transparent; border-color: transparent; color: var(--blue); padding-right: 0; }
.study-page :focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; }
.privacy-note { max-width: 800px; margin-top: 16px; color: var(--muted); font-size: var(--type-caption-size); line-height: var(--type-caption-line); }
.privacy-note a { text-decoration: underline; }
.study-status { display: flex; align-items: center; gap: 10px; min-height: 52px; font-size: 14px; color: var(--muted); }
.study-status[data-state="error"] { color: #b42318; }
.study-status[data-state="busy"] .icon { animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.result-heading h2, .word-heading h2 { font-size: 20px; margin: 0; line-height: 1.4; }
.result-source { color: var(--muted); margin: 12px 0 6px; overflow-wrap: anywhere; }
.result-translation { font-size: 24px; line-height: 1.6; overflow-wrap: anywhere; }
.word-heading { margin: 26px 0 12px; }
.word-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); align-items: stretch; gap: 10px; }
.word { min-width: 0; display: flex; flex-direction: column; gap: 6px; padding: 12px; border: 1px solid var(--border); border-radius: 6px; background: var(--surface-strong); }
.word[data-selected="true"] { border-color: var(--blue); background: var(--accent-soft); }
.word-source { font-weight: 700; font-size: 18px; overflow-wrap: anywhere; }
.word-target { color: var(--muted); overflow-wrap: anywhere; flex: 1; }
.word-actions { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.word-actions input { width: 20px; height: 20px; margin: 0; accent-color: var(--main); cursor: pointer; }
.word-actions label { display: flex; align-items: center; min-width: 44px; min-height: 44px; }
.speech[data-playing="true"] { color: var(--blue); background: var(--accent-soft); }
.export-toolbar { margin-top: 20px; padding: 16px 0; border-top: 1px solid var(--border); flex-wrap: wrap; }
.export-format { display: flex; align-items: center; gap: 10px; margin-left: auto; }
.export-format select { width: 130px; }
.app-invitation { margin-top: 28px; padding: 24px 0; display: flex; gap: 18px; align-items: center; border-top: 1px solid var(--border); }
.app-invitation img { width: 48px; height: 48px; border-radius: 8px; flex-shrink: 0; }
.app-invitation h2 { font-size: 20px; margin: 0 0 6px; line-height: 1.4; }
.app-invitation .button { flex-shrink: 0; box-shadow: none; font-size: 14px; }
[hidden] { display: none !important; }
.study-questions { padding: 24px 0; border-top: 1px solid var(--border); }
.study-questions h2 { font-size: 22px; line-height: 1.4; }
.study-questions h3 { margin: 24px 0 8px; font-size: 16px; }
.study-question { padding: 14px 0; border-bottom: 1px solid var(--border); }
.study-question summary { cursor: pointer; font-weight: 700; }
.study-question p { margin-top: 10px; color: var(--muted); }
.study-questions > p { color: var(--muted); font-size: 14px; }
@media (prefers-color-scheme: dark) {
  .study-status[data-state="error"] { color: #ffaaa3; }
}
@media (max-width: 600px) {
  .study-heading { margin-top: 24px; }
  .study-heading h1 { font-size: 26px; }
  .study-page .nav { gap: 12px; }
  .study-page .nav .download-link { display: none; }
  .language-pair { gap: 8px; }
  .language-pair select { font-size: 14px; padding: 8px; }
  .study-page textarea { font-size: 18px; }
  .workspace-actions { width: 100%; }
  .workspace-actions #analyze, .workspace-actions #recommend { flex: 1; }
  .export-toolbar { gap: 12px; }
  .export-toolbar > span { flex-basis: 100%; }
  .export-format { margin-left: 0; flex: 1; }
  .word-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .app-invitation { flex-wrap: wrap; }
  .app-invitation > div { flex: 1 1 220px; }
  .result-translation { font-size: 21px; }
}
@media (prefers-reduced-motion: reduce) { .study-status[data-state="busy"] .icon { animation: none; } }
.recommendation-filters, .listening-settings { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 14px; }
.recommendation-filters label, .listening-settings label { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; font-size: 14px; }
.recommendation-filters select, .listening-settings select { width: auto; max-width: 100%; min-height: 40px; }
.recommendation-filters label, .listening-settings label { min-width: 0; max-width: 100%; }
.recommendation-origin { margin: 10px 0 14px; font-size: 13px; line-height: 1.6; overflow-wrap: anywhere; }
.recommendation-origin a { color: var(--blue); text-decoration: underline; }
.recommendation-filters { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.recommendation-filters label { display: grid; gap: 6px; align-content: start; }
.recommendation-filters select { width: 100%; min-height: 44px; }
.study-status:empty { display: none; }
.study-question summary { min-height: 44px; align-content: center; }
.home-page .nav .download-link { display: inline-flex; }
@media (max-width: 600px) {
  .recommendation-filters { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .recommendation-filters label:last-child { grid-column: 1 / -1; }
}
.recommendation-origin p { margin: 4px 0; color: var(--muted); }