.calc-card {
  --calc-primary: #004ac6; --calc-primary-dim: rgba(0, 74, 198, 0.08); --calc-surface-low: #f2f4f6;
  --calc-surface-lowest: #ffffff; --calc-surface-highest: #e0e3e5; --calc-on-surface: #191c1e;
  --calc-on-surface-variant: #434655; --calc-outline: #737686; --calc-border: rgba(195, 198, 215, 0.2);
  --calc-success: #16a34a; --calc-radius-sm: 2px; --calc-radius-lg: 4px; --calc-radius-xl: 8px;
  --calc-radius-pill: 20px; --calc-transition: 200ms ease; background-color: var(--calc-surface-low);
  border-radius: var(--calc-radius-xl); padding: 24px; border: 1px solid var(--calc-border);
  font-family: 'Inter', system-ui, sans-serif; color: var(--calc-on-surface); box-sizing: border-box;
  width: 100%; max-width: 860px; margin: auto;
}
.calc-card *, .calc-card *::before, .calc-card *::after { box-sizing: border-box; margin: 0; padding: 0; }
.calc-presets { margin-bottom: 20px; padding-bottom: 16px; border-bottom: 1px solid var(--calc-border); }
.calc-presets__label { font-size: 14px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.1em; color: var(--calc-outline); }
.calc-presets__list { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.calc-presets__btn {
  all: unset; cursor: pointer; padding: 6px 14px; border-radius: var(--calc-radius-pill);
  font-size: 13px; font-weight: 600; color: var(--calc-on-surface-variant); background: var(--calc-surface-highest);
  transition: all var(--calc-transition); font-family: inherit;
}
.calc-presets__btn:hover { color: var(--calc-primary); background: var(--calc-primary-dim); }
.calc-section-label {
  display: block; font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--calc-on-surface-variant); margin-top: 18px; margin-bottom: 12px; padding-bottom: 6px; border-bottom: 2px solid var(--calc-primary);
}
.calc-inputs .calc-section-label:first-child { margin-top: 0; }
.calc-grid { display: flex; flex-wrap: wrap; }
.calc-grid > * { flex: 1 1 340px; margin: 0 12px 24px; }
.calc-inputs { display: flex; flex-direction: column; min-width: 280px; }
.calc-field { display: flex; flex-direction: column; margin-bottom: 14px; }
.calc-label { font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--calc-outline); margin-bottom: 5px; }
.calc-input {
  width: 100%; height: 34px; background-color: var(--calc-surface-highest); border: 1px solid var(--calc-border);
  border-radius: var(--calc-radius-sm); padding: 0 12px; font-size: 14px; color: var(--calc-on-surface);
  transition: box-shadow var(--calc-transition), border-color var(--calc-transition); font-family: inherit;
}
.calc-input:focus { outline: none; border-color: var(--calc-primary); box-shadow: 0 0 0 2px rgba(0, 74, 198, 0.15); }
.calc-select {
  cursor: pointer; -webkit-appearance: none; appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' fill='%23737686'%3E%3Cpath d='M1 1l5 5 5-5'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 10px center; padding-right: 28px;
}
.calc-split-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.calc-results { display: flex; flex-direction: column; gap: 16px; }
.calc-hero-result {
  background-color: var(--calc-surface-lowest); border-radius: var(--calc-radius-xl); padding: 20px;
  text-align: center; border: 1px solid var(--calc-border);
}
.calc-hero-result__label { font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--calc-outline); margin-bottom: 4px; }
.calc-hero-result__value { font-size: 46px; font-weight: 700; color: var(--calc-primary); font-family: 'Manrope', system-ui, sans-serif; line-height: 1.1; }
.calc-hero-result__unit { font-size: 13px; font-weight: 600; color: var(--calc-on-surface-variant); margin-top: 4px; }
.calc-detail-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 8px; background-color: var(--calc-surface-lowest);
  border-radius: var(--calc-radius-lg); padding: 16px; border: 1px solid var(--calc-border);
}
.calc-detail-item { display: flex; flex-direction: column; gap: 2px; }
.calc-detail-item__label { font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; color: var(--calc-outline); }
.calc-detail-item__value { font-size: 16px; font-weight: 700; color: var(--calc-on-surface); }
.calc-detail-item__value--savings { color: var(--calc-success); }
.calc-spec-block {
  background: var(--calc-surface-highest); border-radius: var(--calc-radius-lg); padding: 12px 16px; text-align: center;
  display: flex; flex-direction: column; gap: 4px;
}
.calc-spec-block__label { font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; color: var(--calc-outline); }
.calc-spec-block__value { font-size: 13px; font-weight: 500; color: var(--calc-on-surface); line-height: 1.4; }
.calc-save-btn {
  all: unset; cursor: pointer; display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  margin-top: 16px; padding: 8px 0; width: 100%; font-size: 13px; font-weight: 600; color: var(--calc-outline);
  transition: color var(--calc-transition); font-family: inherit;
}
.calc-save-btn:hover { color: var(--calc-primary); }
.calc-save-btn__icon { font-size: 18px; }
.calc-saved { border-top: 1px solid var(--calc-border); margin-top: 24px; padding-top: 20px; }
.calc-saved__header {
  display: flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.05em; color: var(--calc-on-surface-variant); margin-bottom: 12px;
}
.calc-saved__header-icon { font-size: 16px; }
[data-saved-empty] { font-size: 14px; color: var(--calc-outline); margin: 0; }
[data-saved-list] { display: flex; flex-direction: column; gap: 6px; }
.calc-saved-row {
  display: flex; align-items: center; gap: 8px; padding: 8px 12px; border: 1px solid var(--calc-border);
  border-radius: var(--calc-radius-lg); cursor: pointer; transition: background var(--calc-transition);
  background: var(--calc-surface-lowest); font-size: 14px;
}
.calc-saved-row:hover { background: var(--calc-primary-dim); }
.calc-saved-row__name { min-width: 80px; max-width: 140px; font-weight: 600; color: var(--calc-on-surface); }
.calc-saved-row__dims { font-weight: 600; color: var(--calc-on-surface-variant); font-size: 13px; }
.calc-saved-row__vol { min-width: 70px; font-weight: 700; color: var(--calc-primary); margin-left: auto; text-align: right; font-size: 13px; }
.calc-saved-row__del {
  all: unset; cursor: pointer; display: flex; align-items: center; justify-content: center; width: 24px; height: 24px;
  border-radius: var(--calc-radius-sm); color: var(--calc-outline); transition: all var(--calc-transition); margin-left: 6px;
}
.calc-saved-row__del:hover { color: #b3261e; background: rgba(179, 38, 30, 0.08); }
.calc-saved-row__del .material-symbols-outlined { font-size: 16px; }
@media (max-width: 720px) {
  .calc-card { padding: 16px; }
  .calc-grid > * { margin-left: 0; margin-right: 0; }
  .calc-split-row { grid-template-columns: 1fr; }
  .calc-detail-grid { grid-template-columns: 1fr; }
  .calc-hero-result__value { font-size: 36px; }
}