/* ==================================================================
   BUILD vs. BUY — build-vs-buy.css
   Page-specific styles. Shares design tokens with ../../styles.css,
   so colors, spacing, radii, and fonts all come from the :root vars
   defined there. This file only adds what the calculator needs.

   TABLE OF CONTENTS
   -----------------
   1. LAYOUT              (2-column grid: controls + results)
   2. CONTROLS PANEL      (the left column — sliders + labels)
   3. SLIDERS             (custom-styled range inputs)
   4. RESULTS PANEL       (headline, chart, totals)
   5. RESPONSIVE          (stack at <960px)
   ================================================================== */


/* ==================================================================
   1. LAYOUT
   ================================================================== */
.calculator {
  display: grid;
  gap: var(--s-6);
  align-items: start;
  /* Mobile-first — single column, controls stacked above results. */
  grid-template-columns: 1fr;
}


/* ==================================================================
   2. CONTROLS PANEL
   ================================================================== */
.calc-controls {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--s-5);
}

.calc-heading {
  font-size: 1.125rem;
  font-weight: 700;
  margin: 0 0 var(--s-4);
  color: var(--text);
  letter-spacing: -0.01em;
}

/* A control-group bundles related sliders under a small section label
   ("Buy", "Build") so the form reads as an argument, not a flat list. */
.control-group {
  margin-top: var(--s-5);
  padding-top: var(--s-5);
  border-top: 1px dashed var(--border);
}
.control-group:first-of-type {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}
.control-group-label {
  font-family: var(--font-mono);
  font-size: var(--fs-tiny);
  text-transform: uppercase;
  letter-spacing: 0.25em;
  color: var(--gold);
  margin: 0 0 var(--s-4);
}

.control {
  margin-bottom: var(--s-4);
}
.control:last-child { margin-bottom: 0; }

.control label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--s-3);
  font-size: var(--fs-small);
  color: var(--text);
  margin-bottom: var(--s-2);
}
.control-value {
  color: var(--gold);
  font-family: var(--font-mono);
  font-weight: 600;
  font-variant-numeric: tabular-nums;  /* keeps numbers from jittering as they change */
  white-space: nowrap;
}


/* ==================================================================
   3. SLIDERS
   Custom range inputs. Browsers split this into two pseudo-elements
   (::-webkit- and ::-moz-) so we repeat the thumb + track styles for
   each vendor. Thin gold thumb on a subtle track — matches the
   "Coal & Forged Gold" palette without shouting.
   ================================================================== */
.control input[type="range"] {
  width: 100%;
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
  cursor: pointer;
  margin: 0;
  padding: 8px 0;  /* extra hit area for easier dragging */
}

/* WebKit (Safari, Chrome) track + thumb */
.control input[type="range"]::-webkit-slider-runnable-track {
  height: 4px;
  background: var(--border);
  border-radius: 999px;
}
.control input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  background: var(--gold);
  border-radius: 50%;
  margin-top: -7px;  /* centers the thumb on the 4px track */
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 1px var(--gold);
  transition: transform 120ms var(--ease), box-shadow 120ms var(--ease);
}
.control input[type="range"]:hover::-webkit-slider-thumb,
.control input[type="range"]:focus::-webkit-slider-thumb {
  transform: scale(1.15);
  box-shadow: 0 0 0 1px var(--gold-hot), 0 0 18px rgba(255, 181, 71, 0.45);
}

/* Firefox track + thumb */
.control input[type="range"]::-moz-range-track {
  height: 4px;
  background: var(--border);
  border-radius: 999px;
}
.control input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  background: var(--gold);
  border-radius: 50%;
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 1px var(--gold);
  transition: transform 120ms var(--ease), box-shadow 120ms var(--ease);
}
.control input[type="range"]:hover::-moz-range-thumb,
.control input[type="range"]:focus::-moz-range-thumb {
  transform: scale(1.15);
  box-shadow: 0 0 0 1px var(--gold-hot), 0 0 18px rgba(255, 181, 71, 0.45);
}

.control input[type="range"]:focus-visible {
  outline: 2px solid var(--gold-hot);
  outline-offset: 6px;
  border-radius: 8px;
}


/* ==================================================================
   4. RESULTS PANEL
   ================================================================== */
.calc-results {
  display: flex;
  flex-direction: column;
  gap: var(--s-5);
}

/* Headline card — the big verdict ("Break-even: Year 3"). */
.calc-headline {
  background:
    radial-gradient(80% 120% at 50% 0%, rgba(255, 181, 71, 0.08), transparent 60%),
    var(--surface);
  border: 1px solid var(--border-hot);
  border-radius: var(--radius-lg);
  padding: var(--s-6) var(--s-5);
  text-align: center;
}
.calc-headline-label {
  font-family: var(--font-mono);
  font-size: var(--fs-tiny);
  text-transform: uppercase;
  letter-spacing: 0.25em;
  color: var(--text-faint);
  margin: 0 0 var(--s-2);
}
.calc-headline-value {
  font-size: clamp(1.75rem, 5vw, 3.25rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.05;
  margin: 0;
  background: linear-gradient(135deg, #ffb547 0%, #d4a84b 100%);
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
}

/* Chart container — fixed aspect so the chart has room to breathe
   regardless of screen width. Chart.js handles its own responsiveness
   inside this box via maintainAspectRatio: false + responsive: true. */
.calc-chart-wrap {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--s-5);
  position: relative;
  /* aspect-ratio keeps the chart proportional without JS intervention. */
  aspect-ratio: 16 / 9;
  max-height: 460px;
}
.calc-chart-wrap canvas {
  width: 100% !important;
  height: 100% !important;
}

/* Three small tiles below the chart: Total Buy / Total Build / Delta. */
.calc-totals {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-3);
}
.calc-total {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--s-4);
}
.calc-total-label {
  font-family: var(--font-mono);
  font-size: var(--fs-tiny);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--text-faint);
  margin: 0 0 var(--s-2);
}
.calc-total-value {
  font-size: 1.25rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  margin: 0;
  color: var(--text);
  word-break: break-word;
}
.calc-total.is-buy   .calc-total-value { color: #ffb547; }   /* same gold the "Buy" line uses in the chart */
.calc-total.is-build .calc-total-value { color: #4ade80; }   /* same green the "Build" line uses */
.calc-total.is-delta .calc-total-value { color: var(--text); font-size: 1.125rem; }


/* ==================================================================
   5. RESPONSIVE
   Desktop gets the 2-column split once there's enough room for
   360px of controls + a meaningful chart width beside them.
   ================================================================== */
@media (min-width: 960px) {
  .calculator {
    grid-template-columns: 360px 1fr;
  }
}

@media (max-width: 600px) {
  .calc-totals { grid-template-columns: 1fr; }
  .calc-chart-wrap { aspect-ratio: 4 / 3; }
}