.topic-screen {
  font-size: 17px;
}

.topic-rule p {
  font-size: 1rem;
}

.example-row strong {
  font-size: .98rem;
}

.example-row span,
.exercise-subtitle,
.exercise-tip {
  font-size: .88rem;
}

.exercise-question {
  font-size: 1.13rem;
}

.study-stage,
.topic-exercise-list {
  position: relative;
}

.study-slide,
.topic-exercise-card[data-exercise-slide] {
  display: none;
}

.study-slide.active,
.topic-exercise-card[data-exercise-slide].active {
  display: block;
}

.study-slide > span {
  display: block;
  margin-bottom: 10px;
  color: var(--teal);
  font-size: .72rem;
  font-weight: 850;
  text-transform: uppercase;
}

.content-carousel-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  margin-top: 12px;
}

.content-carousel-nav button {
  min-width: 44px;
  min-height: 42px;
  padding: 0 13px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #153967;
  color: var(--text);
  font: inherit;
  font-size: .82rem;
  font-weight: 800;
  cursor: pointer;
}

.content-carousel-nav button:disabled {
  opacity: .35;
  cursor: default;
}

.content-carousel-nav strong {
  min-width: 58px;
  text-align: center;
  color: var(--gold);
  font-size: .82rem;
}

.topic-navigation-disclosure {
  margin-top: 18px;
  border: 1px solid rgba(144, 217, 240, .24);
  border-radius: 11px;
  background: rgba(7, 22, 45, .58);
}

.topic-navigation-disclosure > button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  min-height: 44px;
  border: 0;
  padding: 9px 13px;
  background: transparent;
  color: var(--teal);
  font: inherit;
  font-size: .72rem;
  font-weight: 900;
  cursor: pointer;
}

.topic-navigation-disclosure > button::after {
  content: "▾";
  color: var(--gold);
}

.topic-navigation-disclosure > button[aria-expanded="true"]::after {
  transform: rotate(180deg);
}

.topic-navigation-disclosure > button strong {
  margin-left: auto;
  color: var(--muted);
  font-size: .7rem;
  text-align: right;
}

.topic-navigation-expanded {
  padding: 0 12px 12px;
  border-top: 1px solid rgba(144, 217, 240, .16);
}

.exercise-navigation {
  margin: 10px 0 0;
}

.topic-navigation-expanded .topic-sequence-nav {
  margin-top: 10px;
  padding: 14px 0 0;
}

.topic-sequence-nav {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: stretch;
  gap: 12px;
  margin: 10px 4px 0;
  padding: 26px 0 8px;
}

.topic-sequence-nav > small {
  align-self: center;
  color: var(--muted);
  font-size: .72rem;
  font-weight: 800;
  white-space: nowrap;
}

.topic-sequence-nav button {
  display: grid;
  gap: 5px;
  min-width: 0;
  min-height: 72px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(21, 57, 103, .92);
  color: var(--text);
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.topic-sequence-nav button:last-child {
  text-align: right;
}

.topic-sequence-nav button span {
  color: var(--teal);
  font-size: .7rem;
  font-weight: 900;
  text-transform: uppercase;
}

.topic-sequence-nav button strong {
  overflow: hidden;
  font-size: .88rem;
  line-height: 1.3;
  text-overflow: ellipsis;
}

.topic-sequence-nav button:disabled {
  opacity: .38;
  cursor: default;
}

.study-slide {
  min-height: 230px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(8, 28, 58, .92);
}

.study-slide.know {
  border-color: var(--teal);
}

.study-slide.no {
  border-color: var(--coral);
}

.study-slide dl {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 10px;
  margin: 0;
}

.study-slide dl > div {
  padding: 10px;
  border-bottom: 1px solid rgba(144, 217, 240, .17);
}

.study-slide dt {
  color: var(--muted);
  font-size: .68rem;
  text-transform: uppercase;
}

.study-slide dd {
  margin: 4px 0 0;
  font-size: 1.08rem;
  font-weight: 800;
}

.verb-form-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.verb-form-card {
  display: grid;
  align-content: start;
  gap: 6px;
  min-height: 88px;
  padding: 13px;
  border: 1px solid rgba(144, 217, 240, .22);
  border-radius: 9px;
  background: rgba(21, 57, 103, .58);
}

.verb-form-card > span,
.verb-meaning span,
.verb-participle-guide > span {
  color: var(--muted);
  font-size: .68rem;
  font-weight: 900;
  letter-spacing: .05em;
  text-transform: uppercase;
}

.verb-form-card strong {
  font-size: 1.22rem;
  line-height: 1.25;
}

.verb-form-card small {
  color: var(--muted);
  font-size: .72rem;
}

.verb-form-card.participle {
  border-color: rgba(144, 217, 240, .22);
  background: rgba(21, 57, 103, .58);
  box-shadow: none;
}

.verb-form-card.participle > span,
.verb-form-card.participle strong {
  color: inherit;
}

.verb-study-group { padding: 14px; }
.verb-study-head,
.verb-study-row { display:grid; grid-template-columns:repeat(3,minmax(0,1fr)) minmax(0,1.15fr) 92px; align-items:center; gap:8px; }
.verb-study-head { padding:0 10px 8px; color:var(--muted); font-size:.64rem; text-transform:uppercase; }
.verb-study-list { display:grid; gap:7px; }
.verb-study-row { min-height:58px; padding:9px 10px; border:1px solid rgba(144,217,240,.18); border-radius:9px; background:rgba(21,57,103,.48); }
.verb-study-row.know { border-color:rgba(102,224,209,.62); background:rgba(102,224,209,.08); }
.verb-study-row.no { border-color:rgba(255,139,123,.55); background:rgba(255,139,123,.07); }
.verb-study-row strong { font-size:.88rem; overflow-wrap:anywhere; }
.verb-study-row .lexicon-term { width:100%; text-align:left; }
.verb-study-row span { color:var(--muted); font-size:.76rem; }
.verb-study-actions { display:flex; justify-content:flex-end; gap:5px; }
.verb-study-actions button { min-width:38px; min-height:38px; border:1px solid var(--line); border-radius:8px; padding:5px; background:#153967; color:var(--text); font:inherit; font-size:.74rem; font-weight:850; cursor:pointer; }

.verb-meaning {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-top: 10px;
  padding: 0 4px;
}

.verb-meaning strong {
  font-size: .92rem;
}

.verb-usage-guide {
  display: grid;
  gap: 7px;
  margin-top: 12px;
  padding: 12px 14px;
  border: 1px solid rgba(102, 224, 209, .28);
  border-radius: 9px;
  background: rgba(102, 224, 209, .07);
}

.verb-usage-guide b {
  color: var(--teal);
  font-size: .76rem;
  text-transform: uppercase;
}

.verb-usage-guide p,
.verb-usage-guide small {
  margin: 0;
  line-height: 1.5;
}

.verb-usage-guide p { font-size: .84rem; }
.verb-usage-guide small { color: var(--muted); font-size: .76rem; }
.verb-usage-guide button { justify-self: start; min-height: 34px; border: 1px solid var(--line); border-radius: 7px; padding: 6px 9px; background: #153967; color: var(--text); font: inherit; font-size: .7rem; font-weight: 850; cursor: pointer; }

.verb-ed-pronunciation { display: grid; grid-template-columns: minmax(0,1fr) auto; align-items: center; gap: 4px 10px; padding: 9px 10px; border-radius: 8px; background: rgba(8,28,58,.55); }
.verb-ed-pronunciation strong { color: var(--gold); font-size: .82rem; }
.verb-ed-pronunciation span { grid-column: 1; color: var(--muted); font-size: .72rem; line-height: 1.4; }
.verb-ed-pronunciation button { grid-column: 2; grid-row: 1 / span 2; }

.verb-participle-guide {
  display: grid;
  gap: 5px;
  margin-top: 14px;
  padding: 12px 14px;
  border-left: 4px solid var(--gold);
  border-radius: 0 8px 8px 0;
  background: rgba(255, 209, 102, .08);
}

.verb-participle-guide > span,
.verb-participle-guide strong {
  color: var(--gold);
}

.verb-participle-guide strong {
  font-size: 1rem;
}

.verb-participle-guide small {
  color: var(--muted);
  line-height: 1.4;
}

.verb-participle-explanation {
  display: grid;
  gap: 7px;
  margin-top: 7px;
  border-top: 1px solid rgba(255, 209, 102, .2);
  padding-top: 10px;
}

.verb-participle-explanation > b {
  color: var(--text);
  font-size: .78rem;
  text-transform: uppercase;
}

.verb-participle-explanation p {
  margin: 0;
  color: var(--muted);
  font-size: .82rem;
  line-height: 1.5;
}

.verb-participle-explanation button {
  justify-self: start;
  min-height: 38px;
  border: 1px solid var(--gold);
  border-radius: 7px;
  padding: 0 11px;
  background: rgba(255, 209, 102, .1);
  color: var(--gold);
  font: inherit;
  font-size: .74rem;
  font-weight: 850;
  cursor: pointer;
}

.structured-participle-help {
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.structured-participle-help section {
  display: grid;
  align-content: start;
  gap: 7px;
  padding: 10px;
  border: 1px solid rgba(144, 217, 240, .2);
  border-radius: 9px;
  background: rgba(7, 28, 55, .42);
}

.structured-participle-help section[lang="es"] {
  border-color: rgba(255, 209, 102, .34);
}

.structured-participle-help section[lang="en"] {
  border-color: rgba(102, 224, 209, .34);
}

.structured-participle-help section > b {
  color: var(--text);
  font-size: .72rem;
  text-transform: uppercase;
}

.structured-participle-help section[lang="en"] button {
  border-color: var(--teal);
  background: rgba(102, 224, 209, .1);
  color: var(--teal);
}

@media (max-width: 620px) {
  .structured-participle-help {
    grid-template-columns: 1fr;
  }
}

.study-actions {
  display: flex;
  gap: 8px;
  margin-top: 16px;
}

.study-actions button {
  min-height: 42px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #153967;
  color: var(--text);
  font: inherit;
  font-size: .8rem;
  font-weight: 800;
  cursor: pointer;
}

.verb-examples {
  margin-top: 14px;
  padding: 12px;
  border-left: 3px solid var(--gold);
  background: rgba(255, 209, 102, .07);
}

.verb-examples[hidden] {
  display: none;
}

.verb-examples p {
  margin: 0 0 7px;
  font-size: .9rem;
  line-height: 1.4;
}

.verb-examples small {
  display: block;
  color: var(--muted);
  font-size: .8rem;
  line-height: 1.45;
}

.verb-examples > header { display: grid; gap: 3px; margin-bottom: 10px; }
.verb-examples > header b { color: var(--gold); font-size: .82rem; }
.verb-examples > article { display: grid; grid-template-columns: minmax(0,1fr) 38px; align-items: center; gap: 10px; padding: 9px 0; border-top: 1px solid rgba(255,209,102,.16); }
.verb-examples > article > div { display: grid; gap: 3px; }
.verb-examples > article span { color: var(--muted); font-size: .66rem; font-weight: 900; text-transform: uppercase; }
.verb-examples > article strong { color: var(--text); font-size: .86rem; line-height: 1.45; }
.verb-examples > article button { width: 36px; height: 36px; border: 1px solid var(--gold); border-radius: 50%; background: #153967; color: var(--gold); cursor: pointer; }

.topic-exercise-list {
  min-height: 260px;
}

.example-contexts {
  display: flex;
  gap: 7px;
  overflow-x: auto;
  padding-bottom: 10px;
}

.example-contexts button {
  flex: 0 0 auto;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 12px;
  color: var(--muted);
  background: #153967;
  font: inherit;
  font-size: .72rem;
  font-weight: 850;
  cursor: pointer;
}

.example-contexts button.active {
  border-color: var(--teal);
  color: #07162d;
  background: var(--teal);
}

.example-stage {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(8, 28, 58, .92);
}

.example-block-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 1px solid var(--line);
  padding: 11px 16px;
  background: rgba(102, 224, 209, .07);
}

.example-block-meta span {
  color: var(--teal);
  font-size: .68rem;
  font-weight: 900;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.example-block-meta strong {
  color: var(--muted);
  font-size: .74rem;
}

.example-list {
  display: grid;
}

.example-row {
  display: flex;
  align-items: center;
  gap: 14px;
  border-bottom: 1px solid rgba(144, 217, 240, .14);
  padding: 13px 16px;
}

.example-row:last-child {
  border-bottom: 0;
}

.example-row[hidden] {
  display: none;
}

.example-copy {
  display: grid;
  min-width: 0;
  flex: 1;
  gap: 3px;
}

.example-copy small {
  color: var(--teal);
  font-size: .62rem;
  font-weight: 900;
  letter-spacing: .06em;
  text-transform: uppercase;
}

.example-copy strong {
  color: var(--text);
  font-size: .98rem;
  line-height: 1.35;
}

.example-copy span {
  color: var(--muted);
  font-size: .82rem;
  line-height: 1.4;
}

.example-listen {
  display: grid;
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  place-items: center;
  border: 1px solid rgba(102, 224, 209, .38);
  border-radius: 10px;
  color: #07162d;
  background: var(--teal);
  font-size: 1rem;
  cursor: pointer;
}

.example-listen:active {
  transform: scale(.94);
}

.example-nav {
  flex-wrap: wrap;
}

.voice-community {
  display: grid;
  gap: 16px;
}

.voice-library {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
}

.voice-card,
.voice-recorder,
.voice-submissions {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(8, 28, 58, .78);
}

.voice-card {
  display: grid;
  gap: 10px;
  padding: 16px;
}

.voice-card > div {
  display: flex;
  justify-content: space-between;
  gap: 10px;
}

.voice-card small,
.voice-status {
  color: var(--muted);
}

.voice-card p {
  margin: 0;
  line-height: 1.45;
}

.voice-card audio,
.voice-recorder audio {
  width: 100%;
}

.voice-recorder > summary,
.voice-submissions > summary {
  padding: 16px;
  color: var(--teal);
  font-weight: 900;
  cursor: pointer;
}

.voice-submission-list {
  display: grid;
  gap: 9px;
  border-top: 1px solid var(--line);
  padding: 14px;
}

.voice-submission {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--line);
  padding: 4px 0 12px;
}

.voice-submission > div {
  display: grid;
  gap: 4px;
}

.voice-submission small,
.voice-submission p {
  margin: 0;
  color: var(--muted);
  font-size: .76rem;
}

.voice-submission button {
  border: 1px solid var(--coral);
  border-radius: 8px;
  padding: 7px 10px;
  color: var(--coral);
  background: transparent;
  font: inherit;
  font-size: .75rem;
  font-weight: 900;
  cursor: pointer;
}

.voice-recorder-body {
  display: grid;
  gap: 14px;
  border-top: 1px solid var(--line);
  padding: 16px;
}

.voice-recorder-body label:not(.voice-consent) {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: .8rem;
  font-weight: 800;
}

.voice-recorder select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: 10px;
  color: var(--text);
  background: #07162d;
}

.voice-recorder-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 9px;
}

.voice-recorder button {
  border: 1px solid var(--teal);
  border-radius: 9px;
  padding: 9px 13px;
  color: #07162d;
  background: var(--teal);
  font: inherit;
  font-weight: 900;
  cursor: pointer;
}

.voice-recorder button:disabled {
  cursor: not-allowed;
  opacity: .45;
}

.voice-consent {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  color: var(--muted);
  font-size: .78rem;
  line-height: 1.45;
}

.voice-status {
  grid-column: 1 / -1;
  margin: 0;
  font-size: .82rem;
}

@media (max-width: 620px) {
  .topic-screen {
    font-size: 16px;
  }

  .example-row {
    align-items: flex-start;
    padding: 12px;
  }

  .example-nav button {
    flex: 0 0 64px;
  }

  .verb-form-grid {
    grid-template-columns: 1fr;
  }

  .verb-form-card {
    min-height: 0;
  }

  .verb-study-head { display:none; }
  .verb-study-row { grid-template-columns:repeat(3,minmax(0,1fr)); }
  .verb-study-row [data-form]::before { content:attr(data-form); display:block; margin-bottom:3px; color:var(--muted); font-size:.56rem; font-weight:800; text-transform:uppercase; }
  .verb-study-row [data-form="Espanol"] { grid-column:1 / 3; }
  .verb-study-actions { grid-column:3; justify-content:flex-end; }

  .study-actions {
    flex-wrap: wrap;
  }

  .topic-sequence-nav {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 8px;
  }

  .topic-sequence-nav > small {
    grid-column: 1 / -1;
    grid-row: 1;
    justify-self: center;
  }

  .topic-sequence-nav button {
    min-height: 78px;
    padding: 10px;
  }

}