/* Dynamic Semantic Revealing — additive layer only (spec §28.2: never replaces
   the timeline, never changes URLs). Tiers use opacity + a text/icon label
   together, never color alone (§14.3: "不得只靠顏色區分"). */

.semantic-box {
  margin: 0 0 2.2rem;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  padding: 1.1rem 1.3rem;
  background: rgba(233, 227, 214, 0.03);
}

.semantic-box .row {
  display: flex;
  gap: 0.6rem;
  align-items: center;
  flex-wrap: wrap;
}

.semantic-input-wrap {
  position: relative;
  flex: 1 1 18rem;
  min-width: 12rem;
}

.semantic-input {
  width: 100%;
  font: inherit;
  font-size: 1.02rem;
  color: var(--paper);
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: 7px;
  padding: 0.65rem 2.4rem 0.65rem 2.6rem;
}

.semantic-input:focus {
  outline: none;
  border-color: var(--gold-dim);
}

.semantic-input-icon {
  position: absolute;
  left: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  width: 1rem;
  height: 1rem;
  color: var(--paper-faint);
  pointer-events: none;
}

.semantic-clear {
  position: absolute;
  right: 0.5rem;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--paper-faint);
  font-size: 1.1rem;
  line-height: 1;
  padding: 0.3rem 0.5rem;
  cursor: pointer;
  display: none;
}
.semantic-input-wrap.has-query .semantic-clear { display: block; }
.semantic-clear:hover { color: var(--paper); }

.semantic-mode-btn, .semantic-reset-btn {
  font: inherit;
  font-size: 0.82rem;
  color: var(--paper-dim);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 7px;
  padding: 0.55rem 0.9rem;
  cursor: pointer;
  white-space: nowrap;
}
.semantic-mode-btn[aria-pressed="true"] {
  color: var(--ink);
  background: var(--gold);
  border-color: var(--gold);
}
.semantic-mode-btn:hover, .semantic-reset-btn:hover { border-color: var(--gold-dim); }

.semantic-meta {
  margin-top: 0.65rem;
  font-family: var(--mono);
  font-size: 0.74rem;
  color: var(--paper-faint);
  letter-spacing: 0.02em;
  min-height: 1.1em;
}

.semantic-expansions {
  margin-top: 0.4rem;
  font-size: 0.76rem;
  line-height: 1.5;
  color: var(--gold-dim);
  display: none;
}
.semantic-expansions.show { display: block; }

.semantic-banner {
  margin-top: 0.65rem;
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--teal);
  display: none;
}
.semantic-banner.show { display: block; }
.semantic-banner.low { color: var(--gold-dim); }

.semantic-tier-stats {
  display: inline-flex;
  gap: 0.7rem;
}
.semantic-tier-stats b { color: var(--paper-dim); font-weight: 600; }

/* --- per-row reveal state (§14.2 / §14.3) --- */
.paper-row.semantic-tier-a { opacity: 1; }
.paper-row.semantic-tier-b { opacity: 0.92; }
.paper-row.semantic-tier-c { opacity: 0.62; }
.paper-row.semantic-tier-d { opacity: 0.38; }
.paper-row.semantic-hidden { opacity: 0.12; pointer-events: none; }
.semantic-focus .paper-row.semantic-hidden { display: none; }

.paper-row .semantic-reason {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--gold-dim);
  letter-spacing: 0.02em;
  margin-left: 0.55rem;
}

/* section headers (month groups) hide in focus mode once every row inside is hidden */
.semantic-focus .section.semantic-empty-section { display: none; }

@media (max-width: 640px) {
  .semantic-box .row { flex-direction: column; align-items: stretch; }
  .semantic-mode-btn, .semantic-reset-btn { flex: 1; }
}