:root {
  --studio-bg: #f5f7fb;
  --studio-ink: #172033;
  --studio-blue: #2b63d9;
  --studio-green: #21875d;
}

body {
  background: var(--studio-bg);
  color: var(--studio-ink);
  overflow-x: hidden;
}

img,
svg,
video,
canvas {
  max-width: 100%;
}

.studio-brand {
  align-items: center;
  display: inline-flex;
  flex-wrap: wrap;
  gap: .55rem;
  line-height: 1;
  text-decoration: none;
}

.studio-brand-sponsor {
  align-items: center;
  border-left: 1px solid #dfe5ef;
  color: #5a6475;
  display: inline-flex;
  font-size: .76rem;
  font-weight: 600;
  gap: .32rem;
  padding-left: .55rem;
  white-space: nowrap;
}

.studio-brand-mark {
  height: 24px;
  width: 24px;
  object-fit: contain;
}

.studio-title-block {
  min-height: 84px;
  padding-left: 5.6rem;
  position: relative;
}

.studio-title-mark {
  height: 70px;
  left: 0;
  opacity: .8;
  object-fit: contain;
  position: absolute;
  top: -.35rem;
  width: 70px;
}

.studio-sponsor-note {
  color: #657186;
  font-size: .82rem;
  font-weight: 600;
  margin-top: .4rem;
}

.studio-brand-panel {
  align-items: center;
  display: flex;
  gap: 1rem;
}

.studio-panel-mark {
  flex: 0 0 auto;
  height: 58px;
  object-fit: contain;
  width: 58px;
}

.login-brand-mark {
  display: block;
  height: 78px;
  margin: 0 auto .85rem;
  object-fit: contain;
  width: 78px;
}

.login-sponsor {
  color: #657186;
  font-size: .84rem;
  font-weight: 600;
}

.studio-panel,
.metric {
  background: #fff;
  border: 1px solid #e2e7f0;
  border-radius: 8px;
  padding: 1rem;
  box-shadow: 0 10px 25px rgba(23, 32, 51, 0.04);
}

.login-shell {
  max-width: 420px;
  padding-top: 8vh;
}

.form-panel {
  max-width: 760px;
}

.action-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: .75rem;
}

.action-grid .btn,
.btn {
  white-space: normal;
}

.status-row {
  color: inherit;
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  padding: .6rem 0;
  text-decoration: none;
  border-bottom: 1px solid #edf0f5;
}

.status-row:hover {
  color: var(--studio-blue);
}

textarea.form-control {
  min-height: 7rem;
}

.studio-panel input[type="text"],
.studio-panel input[type="email"],
.studio-panel input[type="password"] {
  display: block;
  width: 100%;
}

.studio-panel input[type="text"]:not(.form-control),
.studio-panel input[type="email"]:not(.form-control),
.studio-panel input[type="password"]:not(.form-control) {
  background-clip: padding-box;
  border: 1px solid #dee2e6;
  border-radius: .375rem;
  font-size: 1rem;
  line-height: 1.5;
  padding: .375rem .75rem;
}

.vocab-list {
  display: grid;
  gap: .6rem;
}

.vocab-row {
  align-items: center;
  background: #fff;
  border: 1px solid #dfe5ef;
  border-radius: 8px;
  display: flex;
  justify-content: space-between;
  gap: .75rem;
  padding: .65rem .75rem;
}

.vocab-preview-list {
  display: grid;
  gap: .4rem;
}

.vocab-preview-item {
  background: #fff;
  border: 1px solid #e1e6ef;
  border-radius: 6px;
  padding: .45rem .6rem;
}

.token-preview-list {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}

.token-chip {
  background: #fff;
  border: 1px solid #dfe5ef;
  border-radius: 999px;
  padding: .45rem .7rem;
  font-weight: 600;
}

.read-only-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.read-only-grid-wide {
  grid-column: 1 / -1;
}

.form-section {
  border-top: 1px solid #e6ebf3;
  padding-top: 1rem;
}

.form-section-muted {
  background: #f7f9fc;
  border: 1px solid #e1e6ef;
  border-radius: 8px;
  padding: 1rem;
}

.choice-option-row {
  align-items: end;
  display: grid;
  gap: .65rem;
  grid-template-columns: minmax(5.5rem, auto) 1fr auto;
  margin-top: .75rem;
}

.correct-radio {
  align-items: center;
  background: #f7f9fc;
  border: 1px solid #dfe5ef;
  border-radius: 6px;
  cursor: pointer;
  display: inline-flex;
  gap: .45rem;
  min-height: 38px;
  padding: .45rem .65rem;
  white-space: nowrap;
}

.choice-preview-options {
  display: grid;
  gap: .45rem;
}

.choice-preview-row {
  background: #fff;
  border: 1px solid #dfe5ef;
  border-radius: 6px;
  padding: .55rem .65rem;
}

.choice-preview-row.is-correct {
  border-color: rgba(33, 135, 93, .45);
  box-shadow: inset 3px 0 0 var(--studio-green);
}

.question-type-grid {
  display: grid;
  gap: .75rem;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
}

.question-type-card {
  background: #fff;
  border: 1px solid #dfe5ef;
  border-radius: 8px;
  color: var(--studio-ink);
  display: block;
  padding: 1rem;
  text-decoration: none;
}

.question-type-card:hover,
.question-type-card.is-active {
  border-color: var(--studio-blue);
  color: var(--studio-blue);
  box-shadow: inset 0 -3px 0 var(--studio-blue);
}

.curriculum-map,
.coverage-grid {
  display: grid;
  gap: 1rem;
}

.map-band {
  background: #fff;
  border: 1px solid #e2e7f0;
  border-radius: 8px;
  padding: 1rem;
}

.map-level,
.map-branch,
.map-unit {
  display: grid;
  gap: .65rem;
  margin-top: .75rem;
}

.map-branch,
.map-unit {
  border-left: 2px solid #e5ebf5;
  padding-left: .85rem;
}

.map-node,
.map-set {
  align-items: center;
  background: #f8fafc;
  border: 1px solid #e2e7f0;
  border-radius: 6px;
  color: inherit;
  display: flex;
  flex-wrap: wrap;
  gap: .55rem;
  justify-content: space-between;
  min-height: 44px;
  padding: .65rem .75rem;
  text-decoration: none;
}

.map-node-strong {
  background: #eef4ff;
  border-color: rgba(43, 99, 217, .28);
  font-weight: 700;
}

.coverage-row {
  display: grid;
  gap: .8rem;
}

.coverage-metrics {
  display: grid;
  gap: .5rem;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
}

.coverage-metrics span {
  background: #f8fafc;
  border: 1px solid #e4eaf3;
  border-radius: 6px;
  min-height: 44px;
  padding: .55rem .65rem;
}

.quality-strip {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
}

.practice-shell {
  max-width: 880px;
  margin: 0 auto;
}

.question-renderer {
  display: grid;
  gap: .5rem;
}

.question-prompt {
  font-size: 1.08rem;
  font-weight: 700;
  line-height: 1.45;
}

.answer-stack,
.match-grid,
.blank-stack {
  display: grid;
  gap: .65rem;
}

.answer-option {
  background: #fff;
  border: 1px solid #d8e0ec;
  border-radius: 8px;
  color: var(--studio-ink);
  cursor: pointer;
  display: flex;
  gap: .75rem;
  justify-content: space-between;
  min-height: 48px;
  padding: .75rem .85rem;
  text-align: left;
  width: 100%;
}

.answer-option:hover,
.answer-option.is-selected {
  border-color: var(--studio-blue);
  box-shadow: inset 3px 0 0 var(--studio-blue);
}

.word-bank,
.selectable-tokens {
  background: #f8fafc;
  border: 1px solid #e4eaf3;
  border-radius: 8px;
  display: flex;
  flex-wrap: wrap;
  gap: .55rem;
  padding: .75rem;
}

.token-chip {
  min-height: 42px;
}

.token-chip:disabled {
  opacity: .45;
}

.audio-bar {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
}

.audio-bar audio {
  min-width: 220px;
}

.explanation {
  background: #f7f9fc;
  border-left: 3px solid var(--studio-blue);
  padding: .75rem;
}

@media (max-width: 640px) {
  .container {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .studio-panel,
  .metric {
    padding: .9rem;
  }

  .studio-brand {
    align-items: flex-start;
    flex-direction: column;
    gap: .35rem;
  }

  .studio-brand-sponsor {
    border-left: 0;
    font-size: .72rem;
    padding-left: 0;
  }

  .studio-brand-mark {
    height: 20px;
    width: 20px;
  }

  .studio-title-block {
    min-height: 0;
    padding-left: 0;
  }

  .studio-title-mark {
    display: none;
  }

  .studio-brand-panel {
    align-items: flex-start;
  }

  .studio-panel-mark {
    height: 48px;
    width: 48px;
  }

  .action-grid,
  .read-only-grid,
  .question-type-grid,
  .coverage-metrics {
    grid-template-columns: 1fr;
  }

  .btn {
    min-height: 44px;
  }

  form .btn,
  .d-flex.flex-wrap.gap-2 .btn {
    flex: 1 1 100%;
  }

  .btn-link {
    text-align: center;
  }

  .choice-option-row {
    align-items: stretch;
    grid-template-columns: 1fr;
  }

  .correct-radio {
    justify-content: center;
  }

  .map-band {
    padding: .85rem;
  }

  .map-branch,
  .map-unit {
    padding-left: .6rem;
  }

  .map-node,
  .map-set,
  .answer-option {
    align-items: flex-start;
    flex-direction: column;
  }

  .audio-bar audio {
    width: 100%;
  }
}