/**
 * Shared calculator shell — 900px wide, height grows as needed.
 * Clean theme-matched UI with comfortable spacing (no glow/heavy shadows).
 */

.pc-calc-shell {
  /*
   * Theme bridge (dark/light): themes may set --accent, --bg-card, --text-primary, etc.
   * Fallbacks keep a dark default when the active theme does not provide tokens.
   * New calculators must use these --pc-* tokens — never hardcode surface/text hex.
   */
  --pc-primary: var(--accent, #a151ed);
  --pc-primary-hover: var(--accent-hover, #be79ff);
  --pc-primary-soft: var(--accent-soft, rgba(161, 81, 237, 0.14));
  --pc-on-primary: #ffffff;
  --pc-navy: var(--text-primary, #f9fafb);
  --pc-text: var(--text-secondary, #d4d4d8);
  --pc-muted: var(--text-muted, #9ca3af);
  --pc-border: var(--border-subtle, rgba(55, 65, 81, 0.8));
  --pc-border-strong: var(--border-strong, rgba(75, 85, 99, 1));
  --pc-bg: var(--bg-card, #202020);
  --pc-bg-input: var(--bg-input, #181818);
  --pc-bg-soft: color-mix(in srgb, var(--pc-primary) 8%, var(--pc-bg));
  --pc-diagram-bg: color-mix(in srgb, var(--pc-primary) 10%, var(--pc-bg));
  --pc-result-bg: color-mix(in srgb, var(--pc-primary) 12%, var(--pc-bg));
  --pc-result-text: var(--pc-primary-hover);
  --pc-result-text-dark: var(--pc-primary);
  --pc-result-border: color-mix(in srgb, var(--pc-primary) 32%, transparent);
  --pc-result-chip: color-mix(in srgb, var(--pc-primary) 16%, var(--pc-bg));
  /* Ink on diagram panel (formula / SVG labels) — follows theme navy */
  --pc-diagram-ink: var(--pc-navy);
  /* Floating diagram chips stay dark for contrast on both themes */
  --pc-overlay-bg: rgba(20, 20, 20, 0.88);
  --pc-overlay-text: #ffffff;
  --pc-overlay-muted: #f2e9ff;
  --pc-radius: 12px;
  --pc-radius-sm: 8px;
  --pc-font: Tahoma, Verdana, Geneva, sans-serif;
  --pc-ease: ease;

  box-sizing: border-box;
  width: 100%;
  max-width: 950px;
  margin: 0 auto 2rem;
  font-family: var(--pc-font);
  font-size: 14px;
  color: var(--pc-text);
  -webkit-font-smoothing: antialiased;
  line-height: 1.45;
  isolation: isolate;
}

.pc-calc-shell *,
.pc-calc-shell *::before,
.pc-calc-shell *::after {
  box-sizing: border-box;
}

/* Beat theme typography / button bleed */
.pc-calc-shell h1,
.pc-calc-shell h2,
.pc-calc-shell h3,
.pc-calc-shell h4,
.pc-calc-shell h5,
.pc-calc-shell h6,
.pc-calc-shell p,
.pc-calc-shell label,
.pc-calc-shell li,
.pc-calc-shell strong {
  color: inherit;
  font-family: inherit;
  letter-spacing: normal;
  text-transform: none;
  text-shadow: none;
}

.pc-calc-shell h2.pc-calc-section-title {
  margin: 0;
  font-size: 18px !important;
  font-weight: 700 !important;
  line-height: 1.3;
  color: var(--pc-navy) !important;
}

.pc-calc-shell button,
.pc-calc-shell .pc-tab,
.pc-calc-shell .pc-tool {
  box-shadow: none !important;
  text-shadow: none;
  text-transform: none;
  letter-spacing: normal;
}

.pc-calc-shell input,
.pc-calc-shell select {
  box-shadow: none !important;
  font-family: inherit;
}

.pc-calc-shell input.pc-field-input,
.pc-calc-shell input.pc-field-input[type="number"],
.pc-calc-shell input.pc-field-input[type="text"] {
  background: transparent !important;
  background-color: transparent !important;
  color: var(--pc-navy) !important;
  border: 0 !important;
  box-shadow: none !important;
}

.pc-calc-shell select.pc-units-select {
  background-color: var(--pc-bg-input) !important;
  color: var(--pc-text) !important;
}

.pc-calc-noscript {
  padding: 12px 16px;
  margin-bottom: 14px;
  border-radius: var(--pc-radius-sm);
  background: color-mix(in srgb, #ef4444 12%, var(--pc-bg));
  border: 1px solid color-mix(in srgb, #ef4444 35%, transparent);
  color: #f87171;
  font-size: 14px;
}

/* ── Shell: 900 wide, auto height ── */
.pc-calc-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  width: 950px;
  max-width: 100%;
  height: auto;
  background: var(--pc-bg);
  border: 1px solid var(--pc-border);
  border-radius: var(--pc-radius);
  overflow: visible;
}

.pc-calc-col {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 28px 26px;
  overflow: visible;
}

.pc-calc-col--left {
  border-right: 1px solid var(--pc-border);
  gap: 28px;
}

.pc-calc-col--right {
  gap: 18px;
}

.pc-calc-views {
  display: flex;
  flex-direction: column;
  gap: 18px;
  flex: 1;
  min-width: 0;
  min-height: 0;
}

.pc-calc-section {
  display: flex;
  flex-direction: column;
}

.pc-calc-section-head {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  margin-bottom: 16px;
}

.pc-calc-section-head--row {
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 16px;
}

.pc-calc-section-head-main {
  display: flex;
  gap: 12px;
  align-items: center;
  min-width: 0;
  flex: 1;
}

.pc-calc-step {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--pc-primary);
  color: var(--pc-on-primary);
  font-size: 13px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.pc-calc-section-title {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  color: var(--pc-navy);
  line-height: 1.3;
}

.pc-units-label {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 600;
  color: var(--pc-text);
  white-space: nowrap;
  flex-shrink: 0;
}

.pc-units-select {
  appearance: none;
  -webkit-appearance: none;
  padding: 10px 34px 10px 14px;
  border: 1px solid var(--pc-border-strong);
  border-radius: var(--pc-radius-sm);
  background-color: var(--pc-bg-input);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath fill='%239ca3af' d='M1 1l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  color: var(--pc-text);
  font-size: 14px;
  font-weight: 500;
  min-height: 42px;
  max-width: 190px;
  cursor: pointer;
}

.pc-units-select:hover,
.pc-units-select:focus {
  border-color: var(--pc-primary);
  outline: none;
}

/* Shape dropdown */
.pc-shape-label {
  display: block;
  width: 100%;
  margin: 0;
}

.pc-calc-shell .pc-shape-select {
  display: block;
  width: 100%;
  max-width: 100%;
  appearance: none;
  -webkit-appearance: none;
  margin: 0;
  padding: 12px 40px 12px 14px;
  border: 1.5px solid var(--pc-border);
  border-radius: var(--pc-radius-sm);
  background-color: var(--pc-bg-input) !important;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%239ca3af' d='M1.4.6L6 5.2 10.6.6 12 2 6 8 0 2z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  color: var(--pc-text) !important;
  font-size: 14px;
  font-weight: 500;
  font-family: inherit;
  min-height: 46px;
  cursor: pointer;
  box-shadow: none !important;
}

.pc-shape-select:hover,
.pc-shape-select:focus {
  border-color: var(--pc-primary);
  outline: none;
}

/* Inputs */
.pc-inputs {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 16px;
}

.pc-inputs.pc-inputs--2,
.pc-inputs.pc-inputs--3,
.pc-inputs.pc-inputs--4 {
  grid-template-columns: 1fr 1fr;
  gap: 14px 16px;
}

.pc-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.pc-field-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--pc-navy);
}

.pc-field-label .pc-icon {
  width: 14px;
  height: 14px;
  color: var(--pc-primary);
  flex-shrink: 0;
}

.pc-field-control {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
  align-items: stretch;
  border: 1.5px solid var(--pc-border-strong);
  border-radius: var(--pc-radius-sm);
  background: var(--pc-bg-input);
  overflow: hidden;
  min-height: 48px;
  transition: border-color 0.15s ease;
}

.pc-field-control > :only-child {
  grid-column: 1 / -1;
}

.pc-field-control:focus-within {
  border-color: var(--pc-primary);
  box-shadow: none !important;
}

.pc-field-input {
  width: 100%;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  padding: 12px 14px;
  font-size: 16px;
  font-weight: 500;
  color: var(--pc-navy);
}

.pc-field-input::placeholder {
  color: var(--pc-muted);
  font-weight: 400;
  opacity: 0.65;
}

.pc-calc-shell .pc-field-suffix {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 10px;
  font-size: 13px;
  font-weight: 600;
  color: var(--pc-muted) !important;
  background: color-mix(in srgb, var(--pc-bg) 65%, var(--pc-bg-input));
  border-left: 1px solid var(--pc-border);
  min-width: 0;
  pointer-events: none;
  user-select: none;
  cursor: default;
  background-image: none !important;
}

/* Static unit labels must never look like a dropdown (no arrow / pointer). */
.pc-calc-shell .pc-field-unit--static,
.pc-calc-shell span.pc-field-unit {
  display: flex;
  align-items: center;
  justify-content: center;
  width: auto;
  min-width: 2.25rem;
  padding: 0 10px;
  border: 0;
  border-left: 1px solid var(--pc-border);
  border-radius: 0;
  background-color: color-mix(in srgb, var(--pc-bg) 65%, var(--pc-bg-input)) !important;
  background-image: none !important;
  color: var(--pc-muted) !important;
  font-size: 13px;
  font-weight: 600;
  font-family: inherit;
  cursor: default;
  pointer-events: none;
  user-select: none;
  box-shadow: none !important;
}

.pc-calc-shell .pc-field-unit {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  min-width: 0;
  max-width: none;
  margin: 0;
  padding: 0 26px 0 10px;
  border: 0;
  border-left: 1px solid var(--pc-border);
  border-radius: 0;
  background-color: color-mix(in srgb, var(--pc-bg) 65%, var(--pc-bg-input)) !important;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath fill='%239ca3af' d='M1 1l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
  color: var(--pc-navy) !important;
  font-size: 13px;
  font-weight: 650;
  font-family: inherit;
  cursor: pointer;
  box-shadow: none !important;
}

select.pc-field-unit:hover,
select.pc-field-unit:focus {
  outline: none;
  color: var(--pc-primary) !important;
}

/* Secondary mode/preset dropdowns match primary shape select. */
.pc-calc-shell .pc-select-wrap {
  display: block;
  width: 100%;
}

.pc-calc-shell .pc-select-wrap .pc-shape-select {
  width: 100%;
}

/* Shared Math-style Three.js diagrams (Other tools via PCThree3D). */
.pc-calc-shell .pc-diagram.pc-diagram--3d-only {
  position: relative;
  flex: 1;
  height: 100%;
  min-height: 0;
  padding: 0;
  overflow: hidden;
  align-items: stretch;
  justify-content: stretch;
}

.pc-three3d-host.pc-diagram--3d {
  position: absolute;
  inset: 0;
  flex: none;
  height: auto;
  min-height: 0;
  padding: 0;
  overflow: hidden;
  border: 0;
  border-radius: inherit;
  background: transparent;
  cursor: grab;
  touch-action: none;
}

.pc-three3d-host.pc-diagram--3d:active {
  cursor: grabbing;
}

.pc-calc-shell .pc-diagram-3d-canvas {
  display: block;
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  min-height: 0;
}

.pc-calc-shell .pc-diagram-3d-labels {
  position: absolute !important;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.pc-calc-shell .pc-diagram-3d-hint {
  position: absolute;
  top: 0.65rem;
  left: 0.75rem;
  right: auto;
  max-width: 48%;
  margin: 0;
  pointer-events: none;
  z-index: 2;
  font-family: var(--pc-font, system-ui, sans-serif);
  font-size: 0.7rem;
  line-height: 1.3;
  color: var(--pc-muted, #a8a8a8);
}

.pc-calc-shell .pc-diagram-3d-title {
  position: absolute;
  top: 0.55rem;
  right: 0.75rem;
  margin: 0;
  pointer-events: none;
  z-index: 2;
  font-family: var(--pc-font, system-ui, sans-serif);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--pc-navy);
  text-transform: uppercase;
}

.pc-calc-shell .pc-diagram-3d-summary {
  position: absolute;
  right: 0.75rem;
  bottom: 0.65rem;
  left: 0.75rem;
  margin: 0;
  pointer-events: none;
  z-index: 2;
  padding: 0.3rem 0.55rem;
  border-radius: 6px;
  background: var(--pc-overlay-bg);
  border: 1px solid color-mix(in srgb, var(--pc-primary) 55%, transparent);
  color: var(--pc-overlay-text);
  font-family: var(--pc-font, system-ui, sans-serif);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-align: right;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.pc-calc-shell .pc-diagram--3d.is-term-hover {
  cursor: pointer;
}

.pc-calc-shell .pc-diagram-3d-labels {
  pointer-events: none;
}

.pc-calc-shell .pc-3d-dim-label {
  padding: 0.18rem 0.45rem;
  border-radius: 4px;
  background: var(--pc-overlay-bg);
  border: 1px solid color-mix(in srgb, var(--pc-primary) 50%, transparent);
  color: var(--pc-overlay-muted);
  font-family: var(--pc-font, system-ui, sans-serif);
  font-size: 11px;
  font-weight: 650;
  line-height: 1.2;
  white-space: nowrap;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
  user-select: none;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
}

.pc-calc-shell .pc-3d-dim-label--interactive {
  pointer-events: auto;
  cursor: pointer;
}

.pc-calc-shell .pc-3d-dim-label.is-glow {
  background: rgba(255, 229, 102, 0.95);
  border-color: #ffe566;
  color: #1a1420;
  box-shadow: 0 0 0 1px rgba(255, 229, 102, 0.4);
}

/* Tabs */
.pc-tabs {
  display: flex;
  gap: 10px;
}

.pc-tab {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 10px 12px;
  border: 1.5px solid var(--pc-border);
  border-radius: 999px;
  background: var(--pc-bg-input);
  color: var(--pc-text);
  font-size: 13px;
  font-weight: 650;
  cursor: pointer;
  font-family: inherit;
  white-space: nowrap;
  min-height: 42px;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.pc-tab .pc-icon,
.pc-tab-icon {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
}

.pc-tab.is-active {
  background: var(--pc-primary);
  border-color: var(--pc-primary);
  color: var(--pc-on-primary);
}

.pc-panel-wrap {
  display: flex;
  flex-direction: column;
  min-height: 220px;
}

.pc-panel {
  display: none;
  min-height: 220px;
}

.pc-panel.is-active {
  display: flex;
  flex-direction: column;
}

.pc-diagram-frame {
  position: relative;
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 220px;
}

.pc-diagram {
  flex: 1;
  min-height: 220px;
  background: var(--pc-diagram-bg);
  border-radius: var(--pc-radius-sm);
  border: 1px solid var(--pc-border);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  overflow: hidden;
}

/* Formula overlay — top-right of diagram (opposite rotate hint). */
.pc-diagram-formula {
  position: absolute;
  top: 0.65rem;
  right: 0.75rem;
  left: auto;
  z-index: 4;
  margin: 0;
  max-width: min(58%, 240px);
  text-align: right;
  pointer-events: auto;
}

.pc-diagram svg {
  width: 100%;
  height: 100%;
  max-height: 260px;
}

.pc-formula-guide,
.pc-steps-guide {
  flex: 1;
  background: var(--pc-bg-input);
  border: 1px solid var(--pc-border);
  border-radius: var(--pc-radius-sm);
  padding: 18px;
  font-size: 13px;
  line-height: 1.55;
  min-height: 220px;
}

.pc-calc-shell .pc-diagram-formula-text,
.pc-calc-shell .pc-shape-formula-text {
  margin: 0;
  font-family: "Cambria Math", "Times New Roman", serif;
  font-size: 15px;
  font-weight: 700;
  /* Dynamic: light = dark ink, dark = light ink (via --pc-navy) */
  color: var(--pc-diagram-ink, var(--pc-navy)) !important;
  line-height: 1.3;
  word-break: break-word;
  text-shadow: none;
}

.pc-calc-shell .pc-formula-term {
  color: inherit;
}

.pc-panel-placeholder {
  margin: 0;
  color: var(--pc-muted);
  text-align: center;
  padding: 36px 12px;
  font-size: 13px;
}

.pc-guide-title {
  margin: 0 0 10px;
  font-size: 15px;
  font-weight: 700;
  color: var(--pc-navy);
}

.pc-guide-formula {
  display: inline-block;
  margin: 0 0 12px;
  padding: 10px 14px;
  background: var(--pc-primary-soft);
  border-radius: var(--pc-radius-sm);
  border: 1px solid var(--pc-result-border);
  font-family: "Cambria Math", "Times New Roman", serif;
  font-size: 17px;
  font-weight: 700;
  color: var(--pc-primary);
}

.pc-guide-list {
  margin: 0;
  padding-left: 20px;
}

.pc-guide-list li {
  margin-bottom: 6px;
}

.pc-steps-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: pcstep;
}

.pc-steps-list li {
  position: relative;
  padding: 12px 12px 12px 42px;
  margin-bottom: 10px;
  background: var(--pc-bg);
  border-radius: var(--pc-radius-sm);
  border: 1px solid var(--pc-border);
  counter-increment: pcstep;
}

.pc-steps-list li::before {
  content: counter(pcstep);
  position: absolute;
  left: 12px;
  top: 12px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--pc-primary);
  color: var(--pc-on-primary);
  font-size: 11px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.pc-steps-final {
  margin-top: 12px;
  padding: 14px;
  background: var(--pc-result-bg);
  border: 1px solid var(--pc-result-border);
  border-radius: var(--pc-radius-sm);
  color: var(--pc-result-text-dark);
  font-weight: 700;
}

.pc-diagram-svg .pc-shape-stroke {
  fill: color-mix(in srgb, var(--pc-primary) 8%, transparent);
  stroke: var(--pc-primary);
  stroke-width: 2.75;
}

.pc-diagram-svg .pc-shape-dot {
  fill: var(--pc-primary);
  stroke: var(--pc-bg);
  stroke-width: 1.5;
}

.pc-diagram-svg .pc-shape-label {
  fill: var(--pc-navy);
  font-size: 13px;
  font-weight: 650;
  font-family: var(--pc-font);
}

/* Result */
.pc-calc-dimensions .pc-result {
  margin-top: 4px;
}

.pc-result {
  border-radius: var(--pc-radius-sm);
  border: 1px solid var(--pc-primary);
  background: var(--pc-primary);
  min-height: 84px;
  padding: 14px 18px 16px;
}

.pc-result-heading {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--pc-on-primary);
  margin: 0 0 8px;
}

.pc-result-empty {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  min-height: 40px;
  color: var(--pc-on-primary);
  font-size: 14px;
  font-weight: 500;
}

.pc-result-empty[hidden],
.pc-result-filled[hidden],
.pc-result-multi[hidden] {
  display: none !important;
}

/* Beat .pc-calc-shell p { color: inherit } (same specificity otherwise) */
.pc-calc-shell .pc-result-empty p {
  margin: 0;
  color: color-mix(in srgb, var(--pc-on-primary) 92%, transparent);
}

.pc-result-filled {
  display: block;
  min-width: 0;
}

.pc-calc-shell .pc-result-value {
  display: block;
  font-size: 32px;
  font-weight: 800;
  color: var(--pc-on-primary) !important;
  line-height: 1.15;
  letter-spacing: -0.03em;
  word-break: break-word;
}

.pc-result-multi {
  margin-top: 12px;
}

.pc-multi-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.pc-multi-item {
  background: color-mix(in srgb, var(--pc-on-primary) 14%, transparent);
  border: 1px solid color-mix(in srgb, var(--pc-on-primary) 28%, transparent);
  border-radius: var(--pc-radius-sm);
  padding: 10px 12px;
}

.pc-multi-item span {
  display: block;
  font-size: 11px;
  color: color-mix(in srgb, var(--pc-on-primary) 85%, transparent);
  font-weight: 650;
}

.pc-multi-item strong {
  display: block;
  margin-top: 4px;
  font-size: 15px;
  color: var(--pc-on-primary);
}

/* Toolbar */
.pc-toolbar {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
}

.pc-tool {
  width: 100%;
  min-width: 0;
  max-width: 100%;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 12px 6px;
  border: 1.5px solid var(--pc-border);
  border-radius: var(--pc-radius-sm);
  background: var(--pc-bg-input);
  color: var(--pc-text);
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  line-height: 1.2;
  min-height: 68px;
  overflow: hidden;
  box-sizing: border-box;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}

.pc-tool span {
  display: block;
  width: 100%;
  max-width: 100%;
  text-align: center;
  overflow-wrap: anywhere;
  word-break: break-word;
  white-space: normal;
  line-height: 1.15;
}

.pc-tool .pc-icon {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  color: currentColor;
}

.pc-tool[data-action="print"] .pc-icon,
.pc-tool--pdf .pc-icon {
  color: currentColor;
}

.pc-tool:hover {
  border-color: var(--pc-primary);
  background: var(--pc-primary-soft);
  color: #fff;
}

.pc-tool:hover .pc-icon {
  color: #fff;
}

.pc-tool.is-saved {
  border-color: #eab308;
  background: color-mix(in srgb, #eab308 14%, var(--pc-bg-input));
  color: #facc15;
}

.pc-tool.is-saved .pc-icon {
  color: #facc15;
}

.pc-tool.is-saved:hover {
  border-color: #facc15;
  background: color-mix(in srgb, #eab308 22%, var(--pc-bg-input));
  color: #fde047;
}

.pc-tool.is-saved:hover .pc-icon {
  color: #fde047;
}

/* Shared action modal */
body.pc-modal-open {
  overflow: hidden;
}

.pc-modal {
  /* Same theme bridge as .pc-calc-shell (modal mounts on body, outside shell) */
  --pc-primary: var(--accent, #a151ed);
  --pc-primary-hover: var(--accent-hover, #be79ff);
  --pc-primary-soft: var(--accent-soft, rgba(161, 81, 237, 0.14));
  --pc-on-primary: #ffffff;
  --pc-navy: var(--text-primary, #f9fafb);
  --pc-text: var(--text-secondary, #d4d4d8);
  --pc-muted: var(--text-muted, #9ca3af);
  --pc-border: var(--border-subtle, rgba(55, 65, 81, 0.8));
  --pc-border-strong: var(--border-strong, rgba(75, 85, 99, 1));
  --pc-bg: var(--bg-card, #202020);
  --pc-bg-input: var(--bg-input, #181818);

  position: fixed;
  inset: 0;
  z-index: 100000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.28s ease, visibility 0.28s ease;
}

.pc-modal.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.pc-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(8, 8, 12, 0.72);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  opacity: 0;
  transition: opacity 0.28s ease;
}

.pc-modal.is-open .pc-modal-backdrop {
  opacity: 1;
}

.pc-modal-dialog {
  position: relative;
  z-index: 1;
  width: min(100%, 420px);
  max-height: min(86vh, 620px);
  overflow: auto;
  border-radius: 14px;
  border: 1px solid color-mix(in srgb, var(--pc-primary) 38%, var(--pc-border));
  background: var(--pc-bg);
  padding: 22px 20px 18px;
  color: var(--pc-navy);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.28);
  transform: translateY(14px) scale(0.96);
  opacity: 0;
  transition:
    transform 0.32s cubic-bezier(0.22, 1, 0.36, 1),
    opacity 0.28s ease;
}

.pc-modal.is-open .pc-modal-dialog {
  transform: translateY(0) scale(1);
  opacity: 1;
}

.pc-modal-close {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 34px;
  height: 34px;
  border: 0;
  border-radius: 9px;
  background: color-mix(in srgb, var(--pc-navy) 6%, transparent);
  color: var(--pc-navy);
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.pc-modal-close:hover {
  background: color-mix(in srgb, var(--pc-navy) 12%, transparent);
  color: var(--pc-navy);
}

.pc-modal-title {
  margin: 0 36px 14px 0;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--pc-navy);
}

.pc-modal-body {
  display: grid;
  gap: 12px;
}

.pc-modal-note {
  margin: 0;
  font-size: 13px;
  line-height: 1.5;
  color: var(--pc-muted);
}

.pc-modal-note--save {
  padding: 12px 13px;
  border-radius: 10px;
  border: 1px solid color-mix(in srgb, var(--pc-primary) 28%, transparent);
  background: var(--pc-primary-soft);
  color: var(--pc-text);
}

.pc-modal-link {
  width: 100%;
  min-height: 48px;
  padding: 12px 13px;
  border-radius: 10px;
  border: 1px solid var(--pc-border-strong);
  background: var(--pc-bg-input);
  color: var(--pc-navy);
  font-size: 12px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  word-break: break-all;
  line-height: 1.4;
  resize: none;
}

.pc-modal-link:focus {
  outline: none;
  border-color: color-mix(in srgb, var(--pc-primary) 65%, transparent);
}

.pc-modal-result {
  padding: 16px;
  border-radius: 10px;
  border: 1px solid color-mix(in srgb, var(--pc-primary) 45%, transparent);
  background: var(--pc-primary);
  font-size: 22px;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  word-break: break-word;
  color: var(--pc-on-primary);
}

.pc-modal-preview {
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  border: 1px solid var(--pc-border-strong);
  background: var(--pc-bg-input);
  overflow: hidden;
  min-height: 140px;
  max-height: 280px;
  padding: 10px;
}

.pc-modal-preview--loading {
  color: var(--pc-muted);
  font-size: 13px;
  padding: 36px 12px;
}

.pc-modal-preview img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  max-height: 260px;
  object-fit: contain;
  object-position: center;
  background: transparent;
}

.pc-modal-actions {
  margin-top: 18px;
  display: flex;
  justify-content: stretch;
}

.pc-modal-btn {
  width: 100%;
  min-height: 46px;
  border: 0;
  border-radius: 10px;
  font-family: inherit;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.15s ease;
}

.pc-modal-btn--primary {
  background: var(--pc-primary);
  color: var(--pc-on-primary);
}

.pc-modal-btn--primary:hover:not(:disabled) {
  background: var(--pc-primary-hover);
}

.pc-modal-btn--primary:active:not(:disabled) {
  transform: translateY(1px);
}

.pc-modal-btn--primary:disabled {
  opacity: 0.55;
  cursor: wait;
}

@media (prefers-reduced-motion: reduce) {
  .pc-modal,
  .pc-modal-backdrop,
  .pc-modal-dialog {
    transition: none;
  }

  .pc-modal-dialog {
    transform: none;
  }
}

.pc-toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  z-index: 99999;
  padding: 12px 18px;
  border-radius: var(--pc-radius-sm);
  background: var(--pc-navy);
  color: var(--pc-bg);
  font-size: 13px;
}

.pc-toast[hidden] {
  display: none !important;
}

@media print {
  body * {
    visibility: hidden !important;
  }
  .pc-calc-shell,
  .pc-calc-shell * {
    visibility: visible !important;
  }
  .pc-calc-shell {
    position: absolute !important;
    left: 0 !important;
    top: 0 !important;
    width: 950px !important;
    max-width: 100% !important;
  }
  .pc-toolbar,
  .pc-toast {
    display: none !important;
  }
}

/* Tablet */
@media (max-width: 920px) {
  .pc-calc-container {
    width: 100%;
    grid-template-columns: 1fr;
  }

  .pc-calc-col--left {
    border-right: 0;
    border-bottom: 1px solid var(--pc-border);
  }

  .pc-diagram {
    min-height: 240px;
  }

  .pc-field-input {
    font-size: 16px;
  }
}

/* Mobile — reorder: Shape → Diagram/Steps → Dimensions+Results → Toolbar */
@media (max-width: 640px) {
  .pc-calc-container {
    display: flex;
    flex-direction: column;
  }

  .pc-calc-col--left,
  .pc-calc-col--right {
    display: contents;
  }

  .pc-calc-shapes,
  .pc-calc-views,
  .pc-calc-dimensions,
  .pc-toolbar {
    padding: 20px 16px;
  }

  .pc-calc-shapes {
    order: 1;
    border-bottom: 1px solid var(--pc-border);
  }

  .pc-calc-views {
    order: 2;
    flex: none;
    gap: 14px;
    border-bottom: 1px solid var(--pc-border);
  }

  .pc-calc-dimensions {
    order: 3;
    gap: 18px;
    border-bottom: 1px solid var(--pc-border);
  }

  .pc-toolbar {
    order: 4;
  }

  .pc-inputs.pc-inputs--2,
  .pc-inputs.pc-inputs--3,
  .pc-inputs.pc-inputs--4 {
    grid-template-columns: 1fr;
  }

  .pc-calc-section-head--row {
    flex-direction: column;
    align-items: stretch;
  }

  .pc-units-label {
    width: 100%;
    justify-content: space-between;
  }

  .pc-units-select {
    max-width: none;
    flex: 1;
  }

  .pc-tabs {
    flex-wrap: wrap;
  }

  .pc-tab {
    flex: 1 1 calc(50% - 5px);
    font-size: 12px;
  }

  .pc-result-filled {
    display: block;
  }

  .pc-calc-shell .pc-result-value {
    font-size: 28px;
  }

  .pc-toolbar {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
  }

  .pc-tool {
    min-height: 64px;
    font-size: 10px;
    padding: 10px 4px;
  }

  .pc-tool .pc-icon {
    width: 28px;
    height: 28px;
  }

  .pc-multi-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 380px) {
  .pc-toolbar {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}