.pcb-calculator-section {
  padding-top: 30px;
}

.pcb-calculator {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(320px, 0.75fr);
  gap: 18px;
}

.pcb-calc-main,
.pcb-calc-result {
  background: var(--panel);
  border: 1px solid var(--line);
}

.pcb-calc-main {
  padding: 34px;
}

.pcb-upload {
  min-height: 90px;
  margin: 0 0 24px;
  padding: 18px;
  display: flex;
  align-items: center;
  gap: 16px;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.025);
  border: 1px dashed rgba(240, 166, 109, 0.42);
}

.pcb-upload input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.pcb-upload-icon {
  position: relative;
  width: 76px;
  height: 76px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  color: var(--copper-bright);
  background: transparent;
  border: 0;
  box-shadow: none;
  font-size: 0;
}

.pcb-upload-icon::before {
  content: "+";
  display: block;
  font-family: var(--display);
  font-size: 78px;
  font-weight: 900;
  line-height: 0.7;
  color: var(--copper-bright);
  text-shadow: 0 0 24px rgba(220, 138, 81, 0.38);
}

.pcb-upload-icon::after {
  content: none;
}

.pcb-upload strong,
.pcb-upload small {
  display: block;
}

.pcb-upload strong {
  margin-bottom: 5px;
  font-family: var(--display);
  font-size: 14px;
}

.pcb-upload small {
  color: var(--muted);
  font-size: 12px;
}

.pcb-preview {
  margin: -6px 0 24px;
  padding: 14px;
  background:
    linear-gradient(135deg, rgba(80, 214, 232, 0.06), rgba(220, 138, 81, 0.05)),
    rgba(5, 7, 8, 0.42);
  border: 1px solid rgba(80, 214, 232, 0.2);
}

.pcb-preview[hidden] {
  display: none;
}

.pcb-preview-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.pcb-preview-head span {
  color: var(--copper-bright);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.pcb-preview-head small {
  color: var(--muted);
  font-size: 12px;
  text-align: right;
}

.pcb-preview-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.pcb-preview-side {
  margin: 0;
  padding: 10px;
  background: rgba(5, 7, 8, 0.34);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.pcb-preview-side strong {
  display: block;
  margin: 0 0 8px;
  color: #eaf1f1;
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.pcb-preview canvas {
  width: 100%;
  height: auto;
  min-height: 150px;
  display: block;
  background:
    linear-gradient(rgba(80, 214, 232, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(80, 214, 232, 0.055) 1px, transparent 1px),
    radial-gradient(circle at 50% 50%, rgba(220, 138, 81, 0.08), transparent 62%),
    #070b0d;
  background-size: 22px 22px, 22px 22px, auto, auto;
  border: 1px solid var(--line);
}

.pcb-calc-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.pcb-calc-note {
  margin: 0 0 18px;
  padding: 13px 15px;
  color: #c8d1d2;
  background: rgba(80, 214, 232, 0.06);
  border: 1px solid rgba(80, 214, 232, 0.18);
  font-size: 12px;
  line-height: 1.6;
}

.pcb-calculator label > span {
  display: block;
  margin-bottom: 8px;
  color: #c9d0d1;
  font-size: 11px;
  font-weight: 700;
}

.pcb-calculator input,
.pcb-calculator select {
  width: 100%;
  height: 49px;
  padding: 0 15px;
  color: var(--text);
  outline: none;
  background: #0b0f11;
  border: 1px solid var(--line);
  border-radius: 0;
}

.pcb-calculator input:focus,
.pcb-calculator select:focus {
  border-color: rgba(220, 138, 81, 0.7);
  box-shadow: 0 0 0 3px rgba(220, 138, 81, 0.06);
}

.pcb-calculator input[readonly] {
  color: #aab5b7;
  cursor: default;
  background: rgba(11, 15, 17, 0.72);
}

.pcb-calculator input[readonly]:focus {
  border-color: var(--line);
  box-shadow: none;
}

.pcb-check {
  min-height: 49px;
  padding: 0 15px;
  display: flex;
  align-items: center;
  gap: 12px;
  color: #c9d0d1;
  background: #0b0f11;
  border: 1px solid var(--line);
  cursor: pointer;
}

.pcb-calculator .pcb-check input[type="checkbox"] {
  width: 18px;
  height: 18px;
  padding: 0;
  margin: 0;
  accent-color: var(--copper);
  flex: 0 0 auto;
}

.pcb-calculator .pcb-check > span {
  margin: 0;
  font-size: 12px;
}

.pcb-calculator .pcb-check > small {
  margin-left: auto;
  color: var(--copper-bright);
  font-size: 11px;
  font-weight: 800;
  white-space: nowrap;
}

.pcb-calc-details {
  margin-top: 24px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.pcb-calc-details summary {
  margin-bottom: 20px;
  color: var(--copper-bright);
  cursor: pointer;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.pcb-calc-result {
  position: sticky;
  top: 92px;
  align-self: start;
  padding: 34px;
  background:
    linear-gradient(135deg, rgba(220, 138, 81, 0.16), rgba(80, 214, 232, 0.04)),
    var(--panel);
}

.pcb-calc-result > span {
  display: block;
  margin-bottom: 14px;
  color: var(--copper-bright);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.pcb-calc-result strong {
  display: block;
  font-family: var(--display);
  font-size: clamp(36px, 4vw, 56px);
  letter-spacing: -0.05em;
}

.pcb-calc-result p,
.pcb-calc-import {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.7;
}

.pcb-calc-import {
  margin: 22px 0;
  padding: 16px;
  background: rgba(5, 7, 8, 0.42);
  border: 1px solid var(--line);
  white-space: pre-line;
}

.pcb-calc-result .button {
  width: 100%;
}

@media (max-width: 1000px) {
  .pcb-calculator {
    grid-template-columns: 1fr;
  }

  .pcb-calc-result {
    position: static;
  }
}

@media (max-width: 680px) {
  .pcb-calc-main,
  .pcb-calc-result {
    padding: 24px 18px;
  }

  .pcb-preview-head {
    display: block;
  }

  .pcb-preview-head small {
    display: block;
    margin-top: 6px;
    text-align: left;
  }

  .pcb-preview-grid {
    grid-template-columns: 1fr;
  }

  .pcb-calc-grid {
    grid-template-columns: 1fr;
  }
}