/* ============ Calc layout ============ */
.calc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
  margin-top: 28px;
}
.calc-panel { padding: 28px 26px; min-width: 0; }
.calc-panel-title {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--accent-secondary);
  text-transform: uppercase;
  margin-bottom: 18px;
}

/* Presets */
.preset-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 22px;
}
.chip {
  min-height: 44px;
  padding: 10px 16px;
  border-radius: 10px;
  border: 1px solid var(--card-dark-border);
  background: transparent;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: border-color 180ms ease, background 180ms ease, color 180ms ease;
}
.chip:hover { border-color: var(--accent-primary); }
.chip.active {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: #fff;
}

/* Fields */
.field { margin-bottom: 18px; }
.field.no-mb { margin-bottom: 0; }
.field-label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}
.field-label .field-value {
  font-weight: 700;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}
.field input[type="number"] {
  width: 100%;
  min-height: 44px;
  padding: 12px 14px;
  background: rgba(99, 102, 241, 0.05);
  border: 1px solid var(--card-dark-border);
  border-radius: 12px;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  transition: border-color 180ms ease, background 180ms ease;
}
.field input[type="number"]:focus {
  outline: none;
  border-color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.10);
}
.field input[type="number"]::-webkit-outer-spin-button,
.field input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.field input[type="number"] { -moz-appearance: textfield; }

/* Slider */
.slider-wrap { padding-top: 4px; min-height: 44px; display: flex; align-items: center; }
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: rgba(99, 102, 241, 0.18);
  border-radius: 99px;
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 24px;
  height: 24px;
  background: var(--accent-primary);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.4);
  transition: transform 120ms ease;
}
input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.08); }
input[type="range"]::-moz-range-thumb {
  width: 24px;
  height: 24px;
  background: var(--accent-primary);
  border-radius: 50%;
  cursor: pointer;
  border: none;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.4);
}

/* Results panel */
.result {
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.result-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--card-dark-border);
}
.result-row:last-child { border-bottom: none; padding-bottom: 0; }
.result-label {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.4;
}
.result-label small {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 400;
  margin-top: 2px;
}
.result-value {
  font-weight: 800;
  font-size: 26px;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
  background: var(--title-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
}
.result-value.muted {
  background: none;
  -webkit-text-fill-color: var(--text-muted);
  color: var(--text-muted);
  font-size: 18px;
}
.result-hero {
  padding: 20px 22px;
  background: linear-gradient(135deg, rgba(99,102,241,0.14) 0%, rgba(129,140,248,0.10) 100%);
  border: 1px solid rgba(99, 102, 241, 0.28);
  border-radius: 14px;
  margin-bottom: 6px;
}
.result-hero .result-label { color: var(--accent-light); font-weight: 600; }
.result-hero .result-value { font-size: 34px; }
.result-warn {
  margin-top: 8px;
  padding: 12px 14px;
  background: rgba(220, 80, 80, 0.08);
  border: 1px solid rgba(220, 80, 80, 0.28);
  border-radius: 12px;
  color: #f1a0a0;
  font-size: 13px;
  line-height: 1.45;
}
.result-warn.hidden { display: none; }

/* Methodology */
.method-list {
  list-style: none;
  padding: 0;
  margin: 18px 0 0;
  display: grid;
  gap: 12px;
}
.method-list li {
  padding: 14px 16px;
  background: rgba(99, 102, 241, 0.05);
  border: 1px solid var(--card-dark-border);
  border-radius: 12px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.55;
}
.method-list code {
  font-family: 'SF Mono', Menlo, Consolas, monospace;
  background: rgba(99, 102, 241, 0.12);
  color: var(--accent-light);
  padding: 2px 7px;
  border-radius: 6px;
  font-size: 13px;
}

/* FAQ */
.faq { margin-top: 18px; display: grid; gap: 10px; }
.faq details {
  background: rgba(99, 102, 241, 0.05);
  border: 1px solid var(--card-dark-border);
  border-radius: 12px;
  padding: 14px 18px;
  transition: background 180ms ease;
}
.faq details[open] { background: rgba(99, 102, 241, 0.09); }
.faq summary {
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  font-size: 15px;
  color: var(--text-primary);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  min-height: 30px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: '+';
  font-size: 22px;
  color: var(--accent-secondary);
  font-weight: 400;
  transition: transform 200ms ease;
  line-height: 1;
}
.faq details[open] summary::after { transform: rotate(45deg); }
.faq p {
  margin: 10px 0 0;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* Page-specific hero */
.calc-hero { padding: 24px 0 8px; max-width: 760px; }
.calc-hero .gradient-title { font-size: 42px; margin-bottom: 18px; }
.calc-hero p {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 640px;
  line-height: 1.55;
}

/* Responsive */
@media (max-width: 900px) {
  .calc-grid { grid-template-columns: 1fr; }
}
@media (max-width: 740px) {
  .calc-hero .gradient-title { font-size: 30px; }
  .calc-panel { padding: 24px 20px; }
  .result-hero .result-value { font-size: 28px; }
  .result-value { font-size: 22px; }
}