/* Страница расчёта. Подключается только на calculator.html. */

.calc-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 28px;
  align-items: start;
}

.calc-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 22px;
}

.calc-panel > h2 {
  margin: 0 0 16px;
  font-size: 20px;
}

/* --- зона загрузки --- */
.calc-drop {
  display: grid;
  gap: 10px;
  justify-items: center;
  padding: 30px 20px;
  border: 2px dashed var(--line);
  border-radius: var(--radius);
  background: #f8fafc;
  text-align: center;
  transition: border-color 140ms ease, background 140ms ease;
}

.calc-drop.is-over {
  border-color: var(--cyan);
  background: #f0fbfc;
}

.calc-drop p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.calc-drop input[type="file"] {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

.calc-formats {
  font-size: 13px;
}

.calc-formats b {
  color: var(--ink);
}

/* --- просмотр модели --- */
.calc-viewport {
  position: relative;
  margin-top: 18px;
  aspect-ratio: 4 / 3;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    radial-gradient(circle at 50% 40%, #ffffff 0%, #eaf0f4 70%, #dfe7ed 100%);
  overflow: hidden;
}

.calc-viewport canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
  cursor: grab;
}

.calc-viewport canvas:active {
  cursor: grabbing;
}

.calc-viewport .calc-hint {
  position: absolute;
  right: 12px;
  bottom: 10px;
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  pointer-events: none;
}

.calc-viewport.is-unavailable::after {
  content: "Браузер не поддерживает WebGL — расчёт работает, просмотр недоступен";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 20px;
  color: var(--muted);
  font-size: 14px;
  text-align: center;
}

/* --- параметры --- */
.calc-controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 14px;
  margin-bottom: 18px;
}

.calc-field {
  display: grid;
  gap: 6px;
}

.calc-field label {
  color: var(--ink);
  font-size: 13px;
  font-weight: 900;
}

.calc-field select,
.calc-field input {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  color: var(--ink);
  font: inherit;
  font-size: 15px;
}

.calc-field select:focus-visible,
.calc-field input:focus-visible {
  outline: 2px solid var(--cyan-dark);
  outline-offset: 1px;
}

/* --- результат --- */
.calc-rows {
  display: grid;
  gap: 1px;
  margin-bottom: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--line);
}

.calc-rows div {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: space-between;
  padding: 12px 14px;
  background: #fff;
}

.calc-rows dt {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.calc-rows dd {
  margin: 0;
  color: var(--ink);
  font-size: 15px;
  font-weight: 800;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.calc-price {
  display: grid;
  gap: 4px;
  padding: 18px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, #0f2730 0%, #16323d 100%);
  color: #fff;
}

.calc-price span {
  color: rgba(255, 255, 255, 0.66);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.calc-price strong {
  font-size: 34px;
  font-weight: 900;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.calc-price em {
  color: rgba(255, 255, 255, 0.7);
  font-size: 13px;
  font-style: normal;
}

.calc-fit {
  margin: 14px 0 0;
  padding: 12px 14px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 700;
}

.calc-fit.is-ok {
  background: #e8f6ef;
  color: #1f6d4e;
}

.calc-fit.is-warn {
  background: #fdf1e3;
  color: #96591a;
}

.calc-error {
  margin: 14px 0 0;
  padding: 14px;
  border: 1px solid #f0c9c4;
  border-radius: var(--radius);
  background: #fdf0ee;
  color: #a3241a;
  font-size: 14px;
  line-height: 1.6;
}

.calc-empty {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.7;
}

.calc-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.calc-disclaimer {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.7;
}

@media (max-width: 900px) {
  .calc-layout {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .messenger-card,
  .calc-drop {
    transition: none;
  }
}

.calc-note {
  margin: 14px 0 0;
  padding: 12px 14px;
  border-radius: var(--radius);
  background: #eef4f8;
  color: #33505f;
  font-size: 14px;
  line-height: 1.6;
}

.calc-next {
  margin: 14px 0 0;
  padding: 12px 14px;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  color: var(--muted);
  font-size: 14px;
}