.sdmc-root {
  --sdmc-ink: #121826;
  --sdmc-muted: #647087;
  --sdmc-panel: #f5f7fb;
  --sdmc-panel-strong: #e7ecf5;
  --sdmc-card: rgba(255, 255, 255, 0.76);
  --sdmc-line: rgba(34, 45, 67, 0.16);
  --sdmc-accent: #6366f1;
  --sdmc-accent-soft: rgba(99, 102, 241, 0.1);
  --sdmc-rail: #263247;
  --sdmc-rail-soft: #dce3ef;
  --sdmc-success: #10b981;
  --sdmc-success-soft: rgba(16, 185, 129, 0.1);
  --sdmc-menu-bg: #fff;
  --sdmc-menu-hover: #f1f5f9;

  color: var(--sdmc-ink);
}

.theme-dark .sdmc-root {
  --sdmc-ink: #f4f7fb;
  --sdmc-muted: #a9b4c8;
  --sdmc-panel: #111827;
  --sdmc-panel-strong: #1a2435;
  --sdmc-card: rgba(255, 255, 255, 0.055);
  --sdmc-line: rgba(220, 230, 246, 0.16);
  --sdmc-accent: #818cf8;
  --sdmc-accent-soft: rgba(129, 140, 248, 0.15);
  --sdmc-rail: #dfe8f8;
  --sdmc-rail-soft: #263247;
  --sdmc-success: #34d399;
  --sdmc-success-soft: rgba(52, 211, 153, 0.15);
  --sdmc-menu-bg: #1e293b;
  --sdmc-menu-hover: #334155;
}

.sdmc-shell {
  display: grid;
  grid-template-columns: minmax(290px, 0.95fr) minmax(360px, 1.05fr);
  gap: 1.25rem;
  width: 100%;
  padding: clamp(0.85rem, 2.2vw, 1.25rem);
  border: 1px solid var(--sdmc-line);
  border-radius: 12px;
  background:
    radial-gradient(circle at 88% 12%, var(--sdmc-accent-soft), transparent 26%),
    linear-gradient(135deg, var(--sdmc-panel), var(--sdmc-panel-strong));
  box-shadow: 0 22px 54px rgba(18, 24, 38, 0.12);
  backdrop-filter: blur(8px);
}

@media (max-width: 768px) {
  .sdmc-shell {
    grid-template-columns: 1fr;
  }
}

.sdmc-inputs,
.sdmc-visual {
  min-width: 0;
  display: grid;
  gap: 0.85rem;
}

.sdmc-topbar {
  display: grid;
  gap: 0.5rem;
}

.sdmc-toggle,
.sdmc-presets {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.45rem;
  padding: 0.5rem;
  border: 1px solid var(--sdmc-line);
  border-radius: 8px;
  background: var(--sdmc-card);
}

.sdmc-toggle span,
.sdmc-presets span,
.sdmc-fields label span,
.sdmc-results-title,
.sdmc-formula-title {
  color: var(--sdmc-muted);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.sdmc-toggle button,
.sdmc-presets button {
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--sdmc-ink);
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  padding: 0.42rem 0.68rem;
  font-size: 0.82rem;
  transition: background 0.2s, color 0.2s;
}

.sdmc-toggle button.active,
.sdmc-presets button.active {
  background: var(--sdmc-accent);
  color: #fff;
}

.sdmc-fields {
  display: grid;
  gap: 0.85rem;
}

.sdmc-field-group {
  display: grid;
  gap: 0.35rem;
}

.sdmc-fields label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 0.75rem 0.95rem;
  border: 1px solid var(--sdmc-line);
  border-radius: 10px;
  background: var(--sdmc-card);
  position: relative;
}

.sdmc-fields label b {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.sdmc-fields input[type="number"] {
  flex: 1;
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  color: var(--sdmc-ink);
  font: inherit;
  font-size: 1.15rem;
  font-weight: 700;
  text-align: right;
  width: 100%;
  padding: 0.2rem 0;
}

.sdmc-fields input[type="number"]:focus {
  outline: none;
  border-bottom-color: var(--sdmc-accent);
}

.sdmc-fields em {
  font-style: normal;
  font-weight: 700;
  color: var(--sdmc-muted);
  font-size: 0.9rem;
}

.sdmc-custom-dropdown {
  position: relative;
  width: 100%;
}

.sdmc-dropdown-trigger {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: transparent;
  border: 0;
  border-bottom: 2px solid var(--sdmc-line);
  color: var(--sdmc-ink);
  font: inherit;
  font-size: 1.15rem;
  font-weight: 700;
  padding: 0.25rem 0;
  cursor: pointer;
  text-align: left;
}

.sdmc-dropdown-trigger:focus {
  outline: none;
  border-bottom-color: var(--sdmc-accent);
}

.sdmc-dropdown-trigger .sdmc-arrow {
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 6px solid var(--sdmc-muted);
  margin-left: 0.5rem;
  transition: transform 0.2s;
}

.sdmc-dropdown-trigger.active .sdmc-arrow {
  transform: rotate(180deg);
}

.sdmc-dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--sdmc-menu-bg);
  border: 1px solid var(--sdmc-line);
  border-radius: 8px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  z-index: 100;
  max-height: 240px;
  overflow-y: auto;
  margin-top: 0.25rem;
}

.sdmc-dropdown-menu.open {
  display: block;
}

.sdmc-dropdown-option {
  padding: 0.65rem 0.95rem;
  font-size: 0.95rem;
  color: var(--sdmc-ink);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  font-weight: 500;
}

.sdmc-dropdown-option:hover {
  background: var(--sdmc-menu-hover);
}

.sdmc-dropdown-option.active {
  background: var(--sdmc-accent);
  color: #fff;
}

.sdmc-simulation-container {
  border: 1px solid var(--sdmc-line);
  border-radius: 10px;
  background: var(--sdmc-card);
  padding: 0.5rem;
  display: flex;
  justify-content: center;
  align-items: center;
}

.sdmc-results-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.sdmc-result-card {
  padding: 1.15rem;
  border: 1px solid var(--sdmc-line);
  border-radius: 10px;
  background: var(--sdmc-card);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.02);
}

.sdmc-result-value {
  font-size: 2.2rem;
  font-weight: 850;
  color: var(--sdmc-accent);
  line-height: 1.1;
}

.sdmc-result-label {
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--sdmc-muted);
  text-transform: uppercase;
}

.sdmc-result-desc {
  font-size: 0.82rem;
  color: var(--sdmc-ink);
  line-height: 1.4;
}

.sdmc-formula-box {
  padding: 1rem;
  border: 1px solid var(--sdmc-line);
  border-radius: 10px;
  background: var(--sdmc-panel-strong);
  font-size: 0.82rem;
  display: grid;
  gap: 0.45rem;
  color: var(--sdmc-muted);
}

.sdmc-copy-container {
  display: grid;
  gap: 0.5rem;
}

.sdmc-copy-command {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 0.95rem;
  border: 1px solid var(--sdmc-line);
  border-radius: 10px;
  background: var(--sdmc-card);
  font-size: 0.95rem;
  font-weight: 700;
}

.sdmc-btn-copy {
  border: 0;
  border-radius: 6px;
  background: var(--sdmc-accent);
  color: #fff;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  padding: 0.45rem 0.9rem;
  font-size: 0.82rem;
  transition: background 0.2s;
}

.sdmc-btn-copy:hover {
  background: var(--sdmc-success);
}

.sdmc-presets button:hover,
.sdmc-toggle button:hover {
  background: var(--sdmc-accent-soft);
}

.sdmc-dropdown-trigger:hover {
  border-bottom-color: var(--sdmc-accent);
}

#sdmc-svg-canvas {
  background: transparent;
}

#sdmc-svg-pulley {
  fill: var(--sdmc-accent-soft);
  stroke: var(--sdmc-accent);
  stroke-width: 3px;
  transition: all 0.3s ease;
}

#sdmc-svg-shaft-mark {
  stroke: var(--sdmc-ink);
}

#sdmc-svg-belt-carriage {
  fill: var(--sdmc-accent);
  stroke: var(--sdmc-ink);
}

#sdmc-svg-leadscrew-rod {
  fill: var(--sdmc-panel-strong);
  stroke: var(--sdmc-line);
}

#sdmc-svg-leadscrew-nut {
  fill: var(--sdmc-accent);
  stroke: var(--sdmc-ink);
}