/* ═══ Конструктор батареи ═══════════════════════════════════
   Слева выбор, справа липкая колонка с моделью и ценой.
   ═══════════════════════════════════════════════════════════ */

.bld-head {
  padding-block: 10rem 5rem;
  background:
    radial-gradient(90% 70% at 20% 0%, var(--acc-lite) 0%, var(--paper) 62%);
}
.bld-h { margin-bottom: 2.4rem; }
.bld-h em { font-style: normal; color: var(--acc); }
.bld-lead { max-width: 56ch; color: var(--gray); }

.bld { padding-bottom: 10rem; }

.bld__in {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 42rem);
  gap: clamp(3rem, 4vw, 6rem);
  align-items: start;
}
@media (max-width: 1100px) {
  .bld__in { grid-template-columns: 1fr; }
}

/* ── блоки выбора ── */
.bld-blk { padding-block: 3.2rem; border-top: 1px solid var(--line); }
.bld-blk:first-child { border-top: 0; padding-top: 0; }
.bld-blk__h { margin-bottom: 1.6rem; }
.bld-blk__d { margin: -.8rem 0 1.8rem; color: var(--gray); font-size: 1.5rem; }

/* ёмкости — плитки */
.chips { display: flex; flex-wrap: wrap; gap: 1rem; }
.chip {
  display: flex; flex-direction: column; gap: .3rem;
  padding: 1.2rem 1.8rem;
  border: 1px solid var(--line); border-radius: 1.2rem;
  background: var(--paper);
  font: inherit; text-align: left; cursor: pointer;
  transition: border-color var(--fast), background var(--fast);
}
.chip b { font-size: 1.7rem; }
.chip span { font-size: 1.3rem; color: var(--gray); }
.chip:hover { border-color: var(--acc); }
.chip.is-on {
  background: var(--ink); border-color: var(--ink); color: var(--paper);
}
.chip.is-on span { color: var(--acc-lite); }

/* корпус и плата — карточки */
.picks { display: grid; gap: 1rem; }
@media (min-width: 720px) {
  .picks { grid-template-columns: repeat(auto-fit, minmax(20rem, 1fr)); }
}
.pick {
  display: flex; flex-direction: column; gap: .6rem;
  padding: 1.8rem;
  border: 1px solid var(--line); border-radius: 1.4rem;
  background: var(--paper);
  font: inherit; text-align: left; cursor: pointer;
  transition: border-color var(--fast), box-shadow var(--fast);
}
.pick b { font-size: 1.6rem; }
.pick span { font-size: 1.35rem; color: var(--gray); line-height: 1.45; }
.pick i { font-style: normal; font-size: 1.25rem; color: var(--acc-deep); }
.pick__tag {
  align-self: flex-start;
  padding: .3rem 1rem;
  border-radius: 10rem;
  background: var(--acc-lite);
  color: var(--acc-deep) !important;
  font-size: 1.1rem; letter-spacing: .08em; text-transform: uppercase;
}
.pick.is-on .pick__tag { background: var(--signal); color: var(--ink) !important; }
.pick:hover { border-color: var(--acc); }
.pick.is-on {
  border-color: var(--ink);
  box-shadow: 0 0 0 1px var(--ink) inset;
}

/* допы — чекбоксы */
.opts { display: grid; gap: .8rem; }
.opt {
  display: grid;
  grid-template-columns: auto auto 1fr auto;   /* + колонка под иконку */
  align-items: center; gap: 1.4rem;
  padding: 1.4rem 1.8rem;
  border: 1px solid var(--line); border-radius: 1.2rem;
  cursor: pointer;
  transition: border-color var(--fast);
}
.opt:hover { border-color: var(--acc); }
.opt:has(:checked) { border-color: var(--ink); background: var(--acc-lite); }
.opt input { width: 1.8rem; height: 1.8rem; accent-color: var(--acc-deep); }

/* иконки позиций: рисованные PNG в стиле хаки-линии */
.opt__ic {
  width: 4.4rem; height: 4.4rem;
  object-fit: contain;
  opacity: .78;
  transition: opacity var(--fast), transform var(--fast);
}
.opt:hover .opt__ic { opacity: 1; }
.opt:has(:checked) .opt__ic { opacity: 1; transform: scale(1.06); }

.pick__ic {
  width: 6.4rem; height: 6.4rem;
  object-fit: contain;
  margin-bottom: .4rem;
  opacity: .8;
  transition: opacity var(--fast), transform var(--fast);
}
.pick:hover .pick__ic { opacity: 1; }
.pick.is-on .pick__ic { opacity: 1; transform: scale(1.06); }
.opt__b { display: flex; flex-direction: column; gap: .3rem; }
.opt__b b { font-size: 1.5rem; }
.opt__b span { font-size: 1.3rem; color: var(--gray); line-height: 1.45; }
.opt__b i { font-style: normal; color: var(--acc-deep); }
.opt__p { font-size: 1.3rem; color: var(--ink); white-space: nowrap; }

/* размеры */
.dims { display: flex; flex-wrap: wrap; gap: 1.2rem; }
.dims label {
  display: flex; flex-direction: column; gap: .5rem;
  font-size: 1.3rem; color: var(--gray);
}
.dims input {
  width: 11rem; padding: 1.1rem 1.4rem;
  border: 1px solid var(--line); border-radius: 1rem;
  background: var(--paper);
  font: 500 1.7rem "Manrope", sans-serif; color: var(--ink);
}
.dims input:focus { outline: none; border-color: var(--acc); }

.fit { margin-top: 1.4rem; font-size: 1.35rem; color: var(--acc-deep); }
.fit.is-bad { color: #a8321f; }

/* ── правая колонка ── */
.bld__side { position: sticky; top: 9rem; display: grid; gap: 2rem; }
@media (max-width: 1100px) { .bld__side { position: static; } }

.bld-view {
  position: relative;
  border: 1px solid var(--line); border-radius: var(--r);
  background: radial-gradient(100% 70% at 50% 0%, var(--acc-lite), var(--paper-2));
  overflow: hidden;
}
.bld-view__stage { width: 100%; aspect-ratio: 1 / 1; max-height: 42svh; }
.bld-view__stage canvas { display: block; width: 100%; height: 100%; }
.bld-view__hint {
  position: absolute; left: 0; right: 0; bottom: 1.2rem;
  text-align: center; font-size: 1.2rem; color: var(--gray-2);
  pointer-events: none;
}
.bld-view:hover .bld-view__hint { opacity: 0; }

/* итог */
.bld-sum {
  border: 1px solid var(--line); border-radius: var(--r);
  background: var(--paper);
  padding: 2.4rem;
}
.bld-sum__base { padding-bottom: 1.8rem; border-bottom: 1px solid var(--line); }
.bld-sum__tag {
  font-size: 1.15rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--acc-deep); margin: 0 0 1rem;
}
.bld-sum__base ul {
  margin: 0; padding: 0; list-style: none;
  display: flex; flex-wrap: wrap; gap: .5rem 1.2rem;
  font-size: 1.3rem; color: var(--gray);
}
.bld-sum__base li::before { content: "· "; color: var(--acc); }

.bld-sum__lines {
  margin: 1.8rem 0; padding: 0; list-style: none;
  display: grid; gap: .9rem;
}
.bld-sum__lines li {
  display: flex; justify-content: space-between; gap: 1.6rem;
  font-size: 1.45rem;
}
.bld-sum__lines i { font-style: normal; color: var(--gray); }

.bld-sum__total {
  display: flex; justify-content: space-between; align-items: baseline;
  padding-top: 1.8rem; border-top: 1px solid var(--line);
}
.bld-sum__total span { font-size: 1.5rem; color: var(--gray); }
.bld-sum__total b {
  font-family: "Unbounded", sans-serif; font-size: 2.8rem;
  letter-spacing: -.03em;
}

.warn {
  margin: 1.4rem 0 0;
  padding: 1.2rem 1.4rem;
  border-left: 3px solid var(--acc);
  background: var(--acc-lite);
  border-radius: 0 .8rem .8rem 0;
  font-size: 1.35rem; line-height: 1.5; color: var(--ink-2);
}

/* форма */
.bld-form { margin-top: 2.4rem; display: grid; gap: 1rem; }
.bld-form__t { margin: 0 0 .4rem; font-size: 1.4rem; color: var(--gray); }
.bld-form input,
.bld-form textarea {
  width: 100%; padding: 1.3rem 1.6rem;
  border: 1px solid var(--line); border-radius: 1rem;
  background: var(--paper-2);
  font: 400 1.5rem "Manrope", sans-serif; color: var(--ink);
  resize: vertical;
}
.bld-form input:focus,
.bld-form textarea:focus { outline: none; border-color: var(--acc); }
.bld-form .btn { justify-content: center; }
.bld-form__n { margin: .4rem 0 0; font-size: 1.25rem; color: var(--gray-2); }