/* ============================================================
   REVERSE SALES TAX CALCULATOR — Enhanced Styles
   ============================================================ */

.rst-wrap {
  display: flex;
  flex-direction: column;
  gap: 18px;
}


.rst-input-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

@media (max-width: 600px) {
  .rst-input-grid { grid-template-columns: 1fr; }
}


.rst-field {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.rst-label {
  font-size: .82rem;
  font-weight: 600;
  color: var(--subtext);
}

.rst-input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.rst-currency-sign {
  position: absolute;
  left: 14px;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--subtext);
  pointer-events: none;
  z-index: 1;
}

.rst-input--currency { padding-left: 32px !important; }

.rst-input {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  background: var(--card);
  transition: border-color .2s ease, box-shadow .2s ease;
  text-align: center;
}

.rst-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,.12);
}

.rst-input::placeholder {
  color: var(--border);
  font-weight: 400;
  font-size: .9rem;
}

.rst-hint {
  font-size: .68rem;
  color: var(--subtext);
  opacity: .7;
  text-align: center;
}


/* Presets */
.rst-presets {
  display: flex;
  gap: 5px;
  flex-wrap: wrap;
  align-items: center;
}

.rst-preset-label {
  font-size: .72rem;
  font-weight: 700;
  color: var(--subtext);
  text-transform: uppercase;
  letter-spacing: .04em;
  margin-right: 4px;
}

.rst-preset {
  padding: 4px 10px;
  border-radius: 6px;
  font-size: .72rem;
  font-weight: 700;
  cursor: pointer;
  transition: all .2s ease;
  background: var(--bg);
  color: var(--subtext);
  border: 1.5px solid var(--border);
  font-family: var(--system-fonts);
}
  .rst-preset:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  transform: translateY(-1px);
}


/* State Selector */
.rst-state-selector {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.rst-select {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: .9rem;
  font-weight: 600;
  color: var(--text);
  background: var(--card);
  cursor: pointer;
  transition: border-color .2s ease, box-shadow .2s ease;
  font-family: var(--system-fonts);
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' fill='%2364748B'%3E%3Cpath d='M1 1l5 5 5-5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}

.rst-select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,.12);
}

.rst-select:hover {
  border-color: var(--primary);
}


[data-theme="dark"] .rst-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' fill='%2394A3B8'%3E%3Cpath d='M1 1l5 5 5-5'/%3E%3C/svg%3E");
}


/* Result Card */
.rst-result {
  padding: 20px;
  background: var(--bg);
  border-radius: var(--radius);
  border: 1.5px solid var(--border);
  text-align: center;
  transition: all .35s cubic-bezier(.4,0,.2,1);
  transform-origin: top center;
}

.rst-result.hidden { display: none; }

.rst-result.rst-result--visible {
  animation: pctSlideDown .35s cubic-bezier(.4,0,.2,1);
}


.rst-result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  gap: 8px;
  flex-wrap: wrap;
}

.rst-result-badge {
  font-size: .6rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  padding: 3px 8px;
  border-radius: 4px;
  background: rgba(37,99,235,.1);
  color: var(--primary);
  border: 1px solid rgba(37,99,235,.15);
}

.rst-result-label {
  font-size: .85rem;
  font-weight: 600;
  color: var(--subtext);
  flex: 1;
  text-align: left;
}


.rst-result-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 12px;
}

@media (max-width: 600px) {
  .rst-result-grid { grid-template-columns: 1fr; }
}


.rst-result-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 14px 10px;
  background: var(--card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color .2s ease;
}

.rst-result-item:hover { border-color: var(--primary); }

.rst-result-item--base { border-left: 4px solid var(--primary); }

.rst-result-item--tax { border-left: 4px solid var(--accent); }

.rst-result-item--total { border-left: 4px solid var(--success); }


.rst-result-item-label {
  font-size: .65rem;
  font-weight: 700;
  color: var(--subtext);
  text-transform: uppercase;
  letter-spacing: .04em;
}

.rst-result-item-val {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1.2;
}

.rst-result-item--base .rst-result-item-val { color: var(--primary); }

.rst-result-item--tax .rst-result-item-val { color: var(--accent); }

.rst-result-item--total .rst-result-item-val { color: var(--success); }


.rst-copy-btn {
  font-size: .62rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 6px;
  background: transparent;
  color: var(--subtext);
  border: 1.5px solid var(--border);
  cursor: pointer;
  transition: all .2s ease;
  font-family: var(--system-fonts);
  white-space: nowrap;
}

.rst-copy-btn:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.rst-copy-btn--copied {
  background: var(--success) !important;
  color: #fff !important;
  border-color: var(--success) !important;
}


.rst-formula {
  font-size: .82rem;
  color: var(--subtext);
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
  background: var(--card);
  padding: 8px 12px;
  border-radius: 6px;
  display: inline-block;
  border: 1px solid var(--border);
  margin-bottom: 12px;
}


/* Tax Bar */
.rst-tax-bar {
  padding: 14px 16px;
  background: var(--card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
}

.rst-tax-bar-title {
  font-size: .7rem;
  font-weight: 700;
  color: var(--subtext);
  text-transform: uppercase;
  letter-spacing: .04em;
  margin-bottom: 10px;
}

.rst-tax-bar-visual {
  display: flex;
  height: 28px;
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 10px;
}

.rst-tax-bar-segment {
  display: flex;
  align-items: center;
  justify-content: center;
  transition: width .6s cubic-bezier(.4,0,.2,1);
  min-width: 0;
}

.rst-tax-bar-segment--base {
  background: linear-gradient(135deg, #2563eb, #3b82f6);
}

.rst-tax-bar-segment--tax {
  background: linear-gradient(135deg, #f59e0b, #fbbf24);
}

.rst-tax-bar-label {
  font-size: .65rem;
  font-weight: 700;
  color: #fff;
  text-shadow: 0 1px 2px rgba(0,0,0,.2);
  white-space: nowrap;
}

.rst-tax-bar-legend {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  font-size: .78rem;
  color: var(--subtext);
}

.rst-tax-bar-legend strong { color: var(--text); }

.rst-tax-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-right: 4px;
  vertical-align: middle;
}

.rst-tax-dot--base { background: #2563eb; }

.rst-tax-dot--tax { background: #f59e0b; }


/* Error */
.rst-result-error {
  display: none;
  margin-top: 10px;
  padding: 10px 14px;
  background: rgba(239,68,68,.08);
  border: 1px solid rgba(239,68,68,.2);
  border-radius: var(--radius-sm);
  font-size: .85rem;
  color: var(--error);
  text-align: left;
}

.rst-result-error--visible {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.rst-result-error::before {
  content: '!';
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  min-width: 20px;
  background: var(--error);
  color: #fff;
  border-radius: 50%;
  font-size: .75rem;
  font-weight: 800;
}


/* Dark mode */
[data-theme="dark"] .rst-result { background: var(--card); }

[data-theme="dark"] .rst-result-item { background: var(--bg); }

[data-theme="dark"] .rst-formula { background: var(--bg); }

[data-theme="dark"] .rst-tax-bar { background: var(--bg); }

[data-theme="dark"] .rst-input { background: var(--bg); }

[data-theme="dark"] .rst-preset { background: var(--card); }


/* Mobile */
@media (max-width: 480px) {
  .rst-result { padding: 14px 12px; }
  .rst-result-item-val { font-size: 1.1rem; }
  .rst-result-grid { gap: 8px; }
  .rst-result-item { padding: 10px 8px; }
  .rst-preset-label { display: none; }
  .rst-tax-bar { padding: 10px; }
  .rst-tax-bar-visual { height: 24px; }
  .rst-tax-bar-label { font-size: .6rem; }
}