/* ==========================================================================
   Calculadora de ahorro — el corazón interactivo de la página
   ========================================================================== */

.calc-section {
  background: var(--teal-deeper);
  position: relative;
  overflow: hidden;
}
.calc-section::before {
  content: '';
  position: absolute; inset: -10% -10% auto auto; width: 60%; aspect-ratio: 1;
  background: radial-gradient(circle, rgba(217,139,43,.16), transparent 70%);
  pointer-events: none;
}

.calc-console {
  position: relative;
  background: var(--ivory);
  border-radius: var(--radius-lg);
  box-shadow: 0 40px 90px -30px rgba(0,0,0,.55);
  overflow: hidden;
  color: var(--ink);
  max-width: 720px;
  margin-inline: auto;
}

.calc-progress {
  display: flex;
  gap: 6px;
  padding: var(--sp-md) var(--sp-md) 0;
}
.calc-progress i {
  flex: 1; height: 4px; border-radius: 2px;
  background: rgba(107,74,58,.15);
  overflow: hidden;
  position: relative;
}
.calc-progress i::after {
  content: ''; position: absolute; inset: 0; background: var(--amber);
  transform: scaleX(0); transform-origin: left;
  transition: transform var(--dur-med) var(--ease-out);
}
.calc-progress i.is-done::after,
.calc-progress i.is-current::after { transform: scaleX(1); }
.calc-progress i.is-current::after { background: var(--terracotta); }

.calc-body { padding: var(--sp-lg) var(--sp-md) var(--sp-md); min-height: 420px; display: flex; flex-direction: column; }

.calc-stepmeta {
  display: flex; justify-content: space-between; align-items: baseline;
  font-size: var(--step-2xs); font-weight: 700; letter-spacing: .05em;
  color: var(--terracotta); margin-bottom: var(--sp-xs);
}
.calc-stepmeta span:last-child { color: var(--ink-soft); font-weight: 500; }

.calc-step { display: none; flex-direction: column; flex: 1; animation: calcIn .45s var(--ease-out); }
.calc-step.is-active { display: flex; }
@keyframes calcIn { from { opacity: 0; transform: translateX(14px); } to { opacity: 1; transform: none; } }

.calc-step h3 { font-size: var(--step-lg); margin-bottom: .35rem; }
.calc-step > p.hint { color: var(--ink-soft); font-size: var(--step-xs); margin-bottom: var(--sp-md); max-width: 46ch; }

.bill-input-row {
  display: flex; align-items: center; gap: .75rem;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: var(--sp-md);
  margin-bottom: var(--sp-md);
}
.bill-input-row .currency { font-size: var(--step-lg); font-weight: 700; color: var(--camel); }
.bill-input-row input[type="number"] {
  border: none; background: transparent; font-size: var(--step-2xl); font-weight: 700;
  width: 100%; color: var(--teal); font-family: var(--font-body);
}
.bill-input-row input[type="number"]:focus { outline: none; }
.bill-input-row input[type="number"]::-webkit-outer-spin-button,
.bill-input-row input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }

.range-row { display: grid; gap: .5rem; }
input[type="range"] {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 6px; border-radius: 3px;
  background: linear-gradient(to right, var(--amber) 0%, var(--amber) var(--fill, 40%), rgba(107,74,58,.15) var(--fill, 40%));
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 22px; height: 22px; border-radius: 50%;
  background: var(--teal); border: 3px solid var(--amber);
  box-shadow: 0 4px 10px rgba(0,0,0,.25);
}
input[type="range"]::-moz-range-thumb {
  width: 22px; height: 22px; border-radius: 50%;
  background: var(--teal); border: 3px solid var(--amber);
}
.range-scale { display: flex; justify-content: space-between; font-size: var(--step-2xs); color: var(--ink-soft); }

.chip-row { display: flex; flex-wrap: wrap; gap: .6rem; margin-top: var(--sp-sm); }
.chip {
  padding: .55em 1.1em; border-radius: var(--radius-pill);
  border: 1.5px solid rgba(107,74,58,.2);
  background: #fff; font-size: var(--step-2xs); font-weight: 600;
  cursor: pointer; transition: all var(--dur-fast);
}
.chip:hover { border-color: var(--amber); }
.chip.is-selected { background: var(--teal); color: var(--ivory); border-color: var(--teal); }

.upload-zone {
  border: 1.5px dashed rgba(107,74,58,.3);
  border-radius: var(--radius-md);
  padding: var(--sp-md);
  display: flex; align-items: center; gap: var(--sp-sm);
  cursor: pointer;
  transition: border-color var(--dur-fast), background var(--dur-fast);
  margin-top: var(--sp-md);
}
.upload-zone:hover, .upload-zone.is-dragover { border-color: var(--amber); background: rgba(217,139,43,.06); }
.upload-zone svg { flex-shrink: 0; width: 34px; height: 34px; color: var(--olive); }
.upload-zone .upload-copy strong { display: block; font-size: var(--step-xs); }
.upload-zone .upload-copy span { font-size: var(--step-2xs); color: var(--ink-soft); }
.upload-zone input { display: none; }
.upload-filename { margin-top: .6rem; font-size: var(--step-2xs); color: var(--olive); font-weight: 600; display: none; }
.upload-filename.is-visible { display: block; }

.option-cards { display: grid; gap: .75rem; grid-template-columns: 1fr 1fr; }
.option-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  border: 1.5px solid rgba(107,74,58,.18);
  border-radius: var(--radius-md);
  padding: var(--sp-md);
  cursor: pointer;
  background: #fff;
  transition: border-color var(--dur-fast), transform var(--dur-fast);
  text-align: left;
}
.option-card:hover { transform: translateY(-2px); }
.option-card.is-selected { border-color: var(--amber); background: rgba(217,139,43,.07); }
.option-card svg { width: 30px; height: 30px; color: var(--teal); margin-bottom: .5rem; }
.option-card strong { display: block; font-size: var(--step-xs); }
.option-card span { font-size: var(--step-2xs); color: var(--ink-soft); }

.calc-select {
  width: 100%; margin-top: var(--sp-sm);
  padding: .85em 1em;
  border-radius: var(--radius-sm);
  border: 1.5px solid rgba(107,74,58,.22);
  background: #fff;
  font-size: var(--step-xs);
  font-family: var(--font-body);
}
.calc-select:focus { border-color: var(--amber); outline: none; }

.calc-nav {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: auto; padding-top: var(--sp-md);
}
.calc-nav .btn-back { background: none; border: none; font-weight: 600; color: var(--ink-soft); cursor: pointer; font-size: var(--step-xs); }
.calc-nav .btn-back:hover { color: var(--ink); }

/* ---- Resultado ---- */
.result-grid { display: grid; gap: .75rem; grid-template-columns: repeat(2, 1fr); margin-bottom: var(--sp-md); }
.result-card {
  background: var(--bg-card); border-radius: var(--radius-md); padding: var(--sp-md);
  border: 1px solid rgba(107,74,58,.08);
}
.result-card.is-hero { grid-column: 1 / -1; background: linear-gradient(135deg, var(--teal), var(--teal-deep)); color: var(--ivory); }
.result-card.is-hero .result-value { color: var(--amber-soft); }
.result-label { font-size: var(--step-2xs); font-weight: 600; color: var(--ink-soft); text-transform: uppercase; letter-spacing: .04em; }
.result-card.is-hero .result-label { color: var(--on-dark-soft); }
.result-value { font-size: var(--step-2xl); font-weight: 700; color: var(--teal); line-height: 1.1; margin-top: .2rem; }
.result-unit { font-size: var(--step-xs); font-weight: 500; }

.calc-disclaimer { font-size: var(--step-2xs); color: var(--ink-soft); margin-top: var(--sp-sm); }

@media (min-width: 640px) {
  .calc-body { padding: var(--sp-xl) var(--sp-xl) var(--sp-lg); }
  .result-grid { grid-template-columns: repeat(3, 1fr); }
}