/* L15 · 后缀实验室 */
.suffix-lab-intro {
  margin: 0 0 0.55rem;
  padding: 0.55rem 0.65rem;
  border-radius: 12px;
  border: 2px solid #c7d2fe;
  background: linear-gradient(180deg, #fafafa, #f5f3ff);
  font-size: 0.88rem;
  line-height: 1.55;
  color: #334155;
}
.suffix-lab-intro strong { color: #4338ca; }

.suffix-lab-rules {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
  margin-bottom: 0.6rem;
}
.suffix-lab-rules th,
.suffix-lab-rules td {
  padding: 0.4rem 0.5rem;
  text-align: left;
  border-bottom: 1px solid #e2e8f0;
  vertical-align: top;
}
.suffix-lab-rules th {
  background: #f8fafc;
  color: #4338ca;
  font-weight: 800;
  white-space: nowrap;
}
.suffix-lab-rules td:first-child {
  font-weight: 800;
  color: #6366f1;
  width: 6.5rem;
}
.suffix-lab-rules .rule-ex {
  color: #64748b;
  font-size: 0.78rem;
}

.suffix-lab-stage {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.35rem 0;
}
.suffix-lab-stage .suffix-word-card {
  width: 100%;
  max-width: 42rem;
  margin: 0 auto;
  padding: 0.85rem 1rem;
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.1);
}
.suffix-lab-stage .suffix-word-card[hidden] {
  display: none !important;
}
.suffix-lab-stage .suffix-word-pair {
  font-size: clamp(1.05rem, 1.4vw + 0.5rem, 1.25rem);
}
.suffix-lab-stage .suffix-word-ex {
  font-size: clamp(0.92rem, 1vw + 0.45rem, 1.05rem);
  margin-top: 0.55rem;
}
.suffix-lab-stage .suffix-word-ex-zh {
  font-size: 0.88rem;
  margin-top: 0.35rem;
}

.suffix-lab-progress {
  margin: 0 0 0.35rem;
  font-size: 0.88rem;
  font-weight: 800;
  color: #64748b;
  flex-shrink: 0;
  text-align: center;
}

.suffix-lab-nav {
  display: flex;
  gap: 0.55rem;
  justify-content: center;
  flex-shrink: 0;
  padding-top: 0.45rem;
}
.suffix-lab-nav button {
  min-height: 44px;
  min-width: 6.5rem;
  padding: 0.45rem 1.15rem;
  border-radius: 10px;
  border: 2px solid #c7d2fe;
  background: #fff;
  font: inherit;
  font-size: 0.92rem;
  font-weight: 700;
  color: #4338ca;
  cursor: pointer;
  touch-action: manipulation;
}
.suffix-lab-nav button:hover:not(:disabled) {
  background: #eef2ff;
  border-color: #a5b4fc;
}
.suffix-lab-nav button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

#l15-book .panel.suffix-lab-stepper {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 0;
}
#l15-book .panel.suffix-lab-stepper > .suffix-lab-intro {
  flex-shrink: 0;
}
#l15-book .panel.suffix-lab-stepper > .suffix-lab-progress,
#l15-book .panel.suffix-lab-stepper > .suffix-lab-nav {
  flex-shrink: 0;
}
#l15-book .panel.suffix-lab-stepper > .suffix-lab-stage {
  flex: 1 1 auto;
  min-height: 0;
}

.suffix-word-card {
  border: 2px solid #e0e7ff;
  border-radius: 12px;
  padding: 0.55rem 0.65rem;
  background: #fff;
  box-shadow: 0 1px 4px rgba(99, 102, 241, 0.06);
}
.suffix-word-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem 0.55rem;
  margin-bottom: 0.45rem;
}
.suffix-word-pair {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem 0.35rem;
  font-weight: 900;
  font-size: 0.95rem;
  color: #1e1b4b;
}
.suffix-word-pair .sw-base { color: #4338ca; }
.suffix-word-pair .sw-arrow { color: #94a3b8; }

/* 点击揭示区域 */
.sw-reveal {
  display: block;
  width: 100%;
  margin: 0;
  padding: 0.55rem 0.7rem;
  border: 2px dashed #c7d2fe;
  border-radius: 10px;
  background: linear-gradient(180deg, #fafafa, #f8fafc);
  cursor: pointer;
  text-align: left;
  font: inherit;
  touch-action: manipulation;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.sw-reveal:hover:not(.is-revealed) {
  border-color: #a5b4fc;
  background: #eef2ff;
}
.sw-reveal.is-revealed {
  border-style: solid;
  border-color: #c7d2fe;
  background: #fff;
  cursor: default;
}
.sw-reveal-form {
  display: inline-block;
  width: auto;
  min-width: 6.5rem;
  vertical-align: middle;
}
.sw-reveal-ex,
.sw-reveal-exzh {
  margin-top: 0.45rem;
}
.sw-reveal-hint {
  display: block;
  font-size: 0.8rem;
  font-weight: 700;
  color: #94a3b8;
  letter-spacing: 0.02em;
}
.sw-reveal.is-revealed .sw-reveal-hint {
  display: none;
}
.sw-reveal-val[hidden] {
  display: none !important;
}
.sw-reveal-val.sw-form {
  font-weight: 900;
  font-size: inherit;
  color: #059669;
}
.sw-reveal-val.suffix-word-zh {
  font-size: 0.92rem;
  font-weight: 700;
  color: #475569;
}
.sw-reveal-val.suffix-word-ex {
  margin: 0;
  font-size: clamp(0.92rem, 1vw + 0.45rem, 1.05rem);
  line-height: 1.55;
  color: #334155;
}
.sw-reveal-val.suffix-word-ex-zh {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.5;
  color: #64748b;
}

.suffix-word-card .tts-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}
.suffix-word-year {
  font-size: 0.68rem;
  font-weight: 800;
  padding: 0.08rem 0.4rem;
  border-radius: 999px;
  background: #eef2ff;
  color: #4338ca;
  margin-left: auto;
}

#l15-book .panel:has(.suffix-lab-stage) {
  overflow: hidden;
}
#l15-book .panel > .suffix-lab-intro,
#l15-book .panel > .suffix-lab-rules {
  flex-shrink: 0;
}