/* =========================================================
 * 手续费计算器样式 —— 复用 style.css / home.css 设计令牌
 * ======================================================= */

.calc-main {
  max-width: 1080px;
}

.calc-hero {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: flex-end;
  margin-bottom: 28px;
  text-align: left;
}

.calc-hero h1 {
  font-size: clamp(28px, 4.4vw, 42px);
  font-weight: 900;
  letter-spacing: -0.03em;
  background: linear-gradient(120deg, var(--ink) 55%, var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-top: 8px;
}

.calc-hero .subtitle {
  margin-top: 8px;
  color: var(--muted);
  font-size: 14.5px;
  max-width: 640px;
}

.calc-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  padding: 24px;
}

.calc-section-title {
  font-size: 18px;
  font-weight: 800;
  margin-bottom: 16px;
}

.calc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.calc-grid .wide { grid-column: 1 / -1; }

.calc-field span {
  display: block;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--ink-2);
}

.calc-field input[type="number"],
.calc-field select {
  width: 100%;
  height: 46px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 0 14px;
  font-size: 15px;
  background: var(--bg-soft);
  color: var(--ink);
}

.calc-field input:focus,
.calc-field select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.calc-field small {
  display: block;
  color: var(--muted);
  margin-top: 7px;
  font-size: 12px;
}

.calc-field input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.range-labels {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--muted);
  margin-top: 7px;
}

.compare-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-top: 18px;
}

.toggle-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  border-top: 1px solid var(--line);
  margin-top: 22px;
  padding-top: 18px;
}

.toggle-row p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.switch {
  position: relative;
  width: 52px;
  height: 30px;
  flex: 0 0 auto;
}

.switch input { display: none; }

.switch span {
  position: absolute;
  inset: 0;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 999px;
  cursor: pointer;
  transition: 0.2s;
}

.switch span:before {
  content: "";
  position: absolute;
  width: 22px;
  height: 22px;
  left: 4px;
  top: 3px;
  background: #fff;
  border-radius: 50%;
  transition: 0.2s;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.15);
}

.switch input:checked + span {
  background: var(--accent);
  border-color: var(--accent);
}

.switch input:checked + span:before { transform: translateX(22px); }

.rebate-note {
  margin-top: 16px;
  padding: 12px 14px;
  border-radius: 12px;
  background: var(--bg-soft);
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 18px 0;
}

.metric {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow-soft);
}

.metric span {
  display: block;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 7px;
}

.metric strong {
  display: block;
  font-size: 22px;
  font-family: var(--font-mono);
  letter-spacing: -0.03em;
}

.metric em {
  display: block;
  font-size: 12px;
  font-style: normal;
  color: var(--good);
  margin-top: 5px;
}

.metric.highlight {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #fff;
  border-color: transparent;
}

.metric.highlight span,
.metric.highlight em { color: rgba(255, 255, 255, 0.78); }

.migration {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: center;
  padding: 22px;
  margin-bottom: 22px;
  background:
    linear-gradient(135deg, var(--accent-soft), transparent 58%),
    var(--surface);
}

.migration.hidden { display: none; }

.migration h2 {
  font-size: 24px;
  margin: 6px 0;
}

.migration p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.migration .calc-cta { min-width: 200px; }

.section-head {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin: 28px 0 14px;
}

.muted {
  color: var(--muted);
  font-size: 13px;
  margin: 0;
}

.results {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.exchange-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-soft);
}

.exchange-card.best {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--line));
  box-shadow: 0 10px 25px rgba(110, 86, 207, 0.18);
}

.card-top {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: flex-start;
}

.exchange-identity {
  display: flex;
  align-items: center;
  gap: 11px;
}

.exchange-name {
  font-size: 20px;
  font-weight: 800;
}

.source {
  font-size: 12px;
  color: var(--muted);
  margin-top: 2px;
}

.badge {
  font-size: 10px;
  letter-spacing: 0.12em;
  font-weight: 800;
  background: var(--good-soft);
  color: var(--good);
  padding: 7px 9px;
  border-radius: 999px;
  height: max-content;
  white-space: nowrap;
}

.rates {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin: 18px 0;
  padding: 13px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.rates span,
.fee-grid span {
  display: block;
  font-size: 11px;
  color: var(--muted);
  margin-bottom: 4px;
}

.rates strong { font-size: 15px; }

.fee-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.fee-grid strong { font-size: 16px; }

.fee-grid .big {
  font-size: 21px;
  font-family: var(--font-mono);
}

.fee-grid .extra-good { color: var(--good); }
.fee-grid .extra-bad { color: var(--bad); }

.compare-line {
  margin: 17px 0 12px;
  font-size: 12px;
}

.compare-line.good { color: var(--good); }
.compare-line.bad { color: var(--bad); }

.calc-cta {
  display: block;
  text-align: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #fff;
  padding: 12px 14px;
  border-radius: 12px;
  font-weight: 800;
  font-size: 14px;
  text-decoration: none;
  box-shadow: 0 8px 20px rgba(110, 86, 207, 0.35);
}

.calc-cta:hover { transform: translateY(-1px); }

.calc-cta.secondary {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line-strong);
  box-shadow: none;
}

.calc-code-row { margin-top: 10px; }

.source-link {
  display: block;
  text-align: center;
  margin-top: 10px;
  font-size: 12px;
  color: var(--muted);
}

.explainer { margin-top: 20px; }

.formula {
  padding: 10px 12px;
  background: var(--bg-soft);
  border-radius: 10px;
  margin: 8px 0;
  overflow: auto;
}

.formula code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-2);
}

@media (max-width: 820px) {
  .calc-grid,
  .results,
  .compare-controls { grid-template-columns: 1fr; }
  .summary-grid { grid-template-columns: 1fr 1fr; }
  .calc-hero {
    align-items: flex-start;
    flex-direction: column;
  }
  .migration {
    align-items: flex-start;
    flex-direction: column;
  }
  .migration .calc-cta { width: 100%; }
}

@media (max-width: 520px) {
  .summary-grid { grid-template-columns: 1fr; }
  .calc-card { padding: 18px; }
  .exchange-card { padding: 16px; }
  .migration h2 { font-size: 20px; }
}