.mod-head { padding: 40px 0 24px; max-width: 760px; }
.back {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 14px; color: var(--muted-foreground); text-decoration: none; margin-bottom: 16px;
}
.back:hover { color: var(--foreground); }
.mod-head h1 { font-size: 30px; font-weight: 500; letter-spacing: -.015em; margin: 0 0 10px; }
.mod-head p  { margin: 0 0 16px; color: var(--muted-foreground); font-size: 16px; }

.pill {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--card-glass); border: 1px solid var(--border); border-radius: 999px;
  padding: 6px 14px 6px 11px; font-size: 13px; box-shadow: var(--shadow-soft);
}
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--primary); position: relative; }
.dot::after {
  content: ''; position: absolute; inset: -4px; border-radius: 50%;
  border: 1px solid var(--primary); opacity: .35; animation: ping 2.6s ease-out infinite;
}
@keyframes ping {
  0%   { transform: scale(.6); opacity: .5 }
  70%  { transform: scale(1.5); opacity: 0 }
  100% { opacity: 0 }
}

.workspace { display: flex; flex-direction: column; gap: 20px; margin-top: 18px; }

.controls-card {
  background: var(--card-glass); border: 1px solid var(--border-soft);
  border-radius: var(--radius-card); padding: 22px 24px;
  box-shadow: var(--shadow-soft);
}
.control-row {
  display: grid; grid-template-columns: 1fr 1fr auto; gap: 24px; align-items: end;
}
.control-group { display: flex; flex-direction: column; gap: 10px; }
.control-group-btn { justify-content: flex-end; }
.quality-label { font-size: 14px; color: var(--muted-foreground); margin: 0; }

.mode-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.mode-btn {
  display: flex; flex-direction: column; align-items: center; gap: 5px;
  padding: 12px 8px; border-radius: calc(var(--radius-card) - 4px);
  background: var(--secondary); border: 1.5px solid var(--border-soft);
  cursor: pointer; color: inherit; font: inherit;
  transition: border-color .15s, background .15s;
}
.mode-btn:hover { border-color: var(--primary); }
.mode-btn.active { border-color: var(--primary); background: var(--primary-soft); }
.mode-btn .qb-icon { font-size: 16px; color: var(--primary); }
.mode-btn .qb-title { font-size: 13px; font-weight: 500; }

.amount-row { display: flex; align-items: center; gap: 8px; }
.amount-btn {
  width: 38px; height: 38px; border-radius: calc(var(--radius-card) - 4px);
  background: var(--secondary); border: 1.5px solid var(--border-soft);
  cursor: pointer; color: var(--foreground); font-size: 16px;
  display: flex; align-items: center; justify-content: center;
  transition: border-color .15s;
}
.amount-btn:hover { border-color: var(--primary); }
.amount-input {
  width: 70px; font: inherit; font-size: 16px; text-align: center;
  padding: 8px 10px; background: var(--secondary);
  border: 1.5px solid var(--border-soft); border-radius: calc(var(--radius-card) - 4px);
  color: var(--foreground); outline: none; transition: border-color .15s;
  -moz-appearance: textfield;
}
.amount-input::-webkit-outer-spin-button,
.amount-input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.amount-input:focus { border-color: var(--primary); }

.result-card {
  display: flex; flex-direction: column; gap: 16px;
  padding: 22px 24px;
  background: var(--card-glass); border: 1px solid var(--border-soft);
  border-radius: var(--radius-card); box-shadow: var(--shadow-soft);
}
.result-label {
  font-size: 12px; color: var(--muted-foreground);
  text-transform: uppercase; letter-spacing: .04em;
}
.result-text {
  font-size: 15px; line-height: 1.75; color: var(--foreground);
  white-space: pre-wrap; min-height: 60px;
}

.action-bar { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }

.explainer { margin-top: 46px; }
.explainer h2 { font-size: 19px; font-weight: 500; margin: 0 0 16px; }
.ex-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.ex-item {
  background: var(--card-glass); border: 1px solid var(--border-soft);
  border-radius: var(--radius-card); padding: 20px;
}
.ex-item .ti { font-size: 20px; color: var(--primary); }
.ex-item h3  { font-size: 15px; font-weight: 500; margin: 8px 0 5px; }
.ex-item p   { margin: 0; font-size: 13.5px; line-height: 1.55; color: var(--muted-foreground); }

@media (max-width: 900px) {
  .control-row { grid-template-columns: 1fr 1fr; }
  .control-group-btn { grid-column: 1 / -1; }
  .ex-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .control-row { grid-template-columns: 1fr; }
  .ex-grid { grid-template-columns: 1fr; }
  .mod-head h1 { font-size: 24px; }
  .mod-head { padding: 28px 0 18px; }
}