:root {
  --n-ink: #17202a;
  --n-muted: #63707c;
  --n-surface: #f7f4ed;
  --n-panel: #fffdf8;
  --n-panel-strong: #f0eadc;
  --n-line: #d9d1c2;
  --n-accent: #cb4b32;
  --n-accent-strong: #9e2f20;
  --n-accent-soft: #f6d8cd;
  --n-secondary: #2b7885;
  --n-secondary-soft: #d7edf0;
  --n-orbit: #ead7a4;
  --n-success: #2d7657;
  --n-shadow: #17202a1a;
}

.theme-dark {
  --n-ink: #f6f0e5;
  --n-muted: #b7b0a4;
  --n-surface: #171b1e;
  --n-panel: #20272a;
  --n-panel-strong: #2a3235;
  --n-line: #485154;
  --n-accent: #ee7355;
  --n-accent-strong: #ff9b7f;
  --n-accent-soft: #55332b;
  --n-secondary: #6fc4ce;
  --n-secondary-soft: #23464b;
  --n-orbit: #766b45;
  --n-success: #79c59c;
  --n-shadow: #0000003d;
}

.ohm-tool {
  color: var(--n-ink);
  background: var(--n-panel);
  border: 1px solid var(--n-line);
  border-radius: 0.75rem;
  max-width: 100%;
  min-width: 0;
  padding: clamp(1rem, 2.5vw, 1.5rem);
}

.ohm-intro,
.ohm-section-heading,
.ohm-presets-heading,
.ohm-input-topline,
.ohm-result-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.ohm-intro {
  border-bottom: 1px solid var(--n-line);
  padding-bottom: 1.25rem;
}

.ohm-intro p,
.ohm-section-heading p {
  color: var(--n-muted);
  line-height: 1.5;
  margin: 0;
}

.ohm-status {
  border: 1px solid var(--n-line);
  border-radius: 999px;
  color: var(--n-muted);
  font-size: 0.75rem;
  padding: 0.45rem 0.7rem;
  white-space: nowrap;
}

.ohm-status[data-state='ready'] {
  border-color: var(--n-success);
  color: var(--n-success);
}

.ohm-status[data-state='invalid'] {
  border-color: var(--n-accent);
  color: var(--n-accent);
}

.ohm-layout {
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(16rem, 0.9fr) minmax(18rem, 1.1fr);
  min-width: 0;
  padding-top: 1rem;
}

.ohm-controls,
.ohm-stage,
.ohm-results {
  min-width: 0;
}

.ohm-section-heading {
  align-items: flex-start;
  justify-content: flex-start;
}

.ohm-section-heading h2 {
  font-size: 1rem;
  letter-spacing: 0.02em;
  margin: 0 0 0.25rem;
}

.ohm-kicker {
  color: var(--n-accent);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  padding-top: 0.2rem;
}

.ohm-controls {
  border-right: 1px solid var(--n-line);
  padding-right: 1rem;
}

.ohm-stage {
  padding-left: 1rem;
}

.ohm-input-grid {
  display: grid;
  gap: 0.7rem;
  margin-top: 1.5rem;
}

.ohm-input {
  background: var(--n-panel-strong);
  border: 1px solid transparent;
  border-radius: 0.75rem;
  padding: 0.8rem;
}

.ohm-input:focus-within {
  border-color: var(--n-secondary);
}

.ohm-input-topline {
  color: var(--n-muted);
  font-size: 0.78rem;
  margin-bottom: 0.45rem;
}

.ohm-input-name {
  color: var(--n-ink);
  font-weight: 700;
}

.ohm-input-line {
  display: flex;
  gap: 0.55rem;
}

.ohm-input input {
  background: var(--n-panel);
  border: 1px solid var(--n-line);
  border-radius: 0.45rem;
  color: var(--n-ink);
  flex: 1 1 auto;
  font: inherit;
  min-width: 0;
  padding: 0.65rem 0.7rem;
  width: auto;
}

.ohm-input input:disabled {
  color: var(--n-muted);
  opacity: 0.55;
}

.ohm-known-toggle,
.ohm-preset-list button,
.ohm-presets-heading button {
  border: 1px solid var(--n-line);
  border-radius: 0.45rem;
  color: var(--n-muted);
  cursor: pointer;
  font: inherit;
}

.ohm-known-toggle {
  background: var(--n-panel);
  flex: 0 0 auto;
  font-size: 0.72rem;
  padding: 0.35rem 0.5rem;
  white-space: nowrap;
}

.ohm-known-toggle.is-active {
  background: var(--n-accent-soft);
  border-color: var(--n-accent);
  color: var(--n-accent-strong);
}

.ohm-presets {
  border-top: 1px solid var(--n-line);
  margin-top: 1.25rem;
  padding-top: 1rem;
}

.ohm-presets-heading {
  color: var(--n-muted);
  font-size: 0.78rem;
}

.ohm-presets-heading button {
  background: transparent;
  padding: 0.3rem 0.5rem;
}

.ohm-preset-list {
  border: 1px solid var(--n-line);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 0.65rem;
}

.ohm-preset-list button {
  background: var(--n-panel-strong);
  border: 0;
  border-right: 1px solid var(--n-line);
  border-radius: 0;
  color: var(--n-ink);
  min-width: 0;
  padding: 0.5rem 0.6rem;
  text-align: left;
}

.ohm-preset-list button:last-child {
  border-right: 0;
}

.ohm-known-toggle:hover,
.ohm-preset-list button:hover,
.ohm-presets-heading button:hover {
  border-color: var(--n-accent);
}

.ohm-orbit-frame {
  align-items: center;
  background: var(--n-panel-strong);
  border: 1px solid var(--n-line);
  border-radius: 0.8rem;
  display: flex;
  justify-content: center;
  margin: 1.5rem 0 0;
  min-height: 21rem;
  overflow: hidden;
  padding: 0.5rem;
}

.ohm-orbit {
  max-width: 100%;
  overflow: visible;
  width: min(100%, 22rem);
}

.circuit-trace {
  animation: trace-flow 4s linear infinite;
  fill: none;
  stroke: var(--n-orbit);
  stroke-dasharray: 2 6;
  stroke-linecap: round;
  stroke-width: 3;
}

@keyframes trace-flow {
  to {
    stroke-dashoffset: -32;
  }
}

.circuit-core {
  fill: var(--n-panel);
  stroke: var(--n-accent);
  stroke-width: 1.5;
}

.resistor-symbol {
  fill: none;
  stroke: var(--n-accent);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 3;
}

.circuit-core-label,
.circuit-core-value,
.terminal-label,
.terminal-value {
  fill: var(--n-ink);
  text-anchor: middle;
}

.circuit-core-label {
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: 0.16em;
}

.circuit-core-value {
  fill: var(--n-accent-strong);
  font-size: 0.7rem;
}

.terminal rect {
  stroke-width: 1.5;
}

.terminal.is-known rect {
  fill: var(--n-secondary-soft);
  stroke: var(--n-secondary);
}

.terminal.is-solved rect {
  fill: var(--n-accent-soft);
  stroke: var(--n-accent);
}

.terminal-dot {
  fill: var(--n-panel);
  stroke: var(--n-accent);
  stroke-width: 2;
}

.terminal.is-known .terminal-dot {
  stroke: var(--n-secondary);
}

.terminal-label {
  font-size: 0.64rem;
  font-weight: 700;
}

.terminal-value {
  font-size: 0.62rem;
}

.orbit-empty {
  align-items: center;
  color: var(--n-muted);
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  text-align: center;
}

.orbit-empty-mark {
  color: var(--n-accent);
  font-size: clamp(1.5rem, 7vw, 2.5rem);
  font-weight: 800;
  letter-spacing: 0.24em;
}

.ohm-formula {
  border-left: 3px solid var(--n-secondary);
  color: var(--n-muted);
  font-size: 0.82rem;
  line-height: 1.5;
  margin-top: 1rem;
  padding: 0.25rem 0 0.25rem 0.8rem;
}

.ohm-results {
  border-top: 1px solid var(--n-line);
  margin-top: 1rem;
  padding-top: 1rem;
}

.ohm-result-grid {
  display: grid;
  gap: 0.7rem;
  grid-template-columns: repeat(4, 1fr);
  margin-top: 1.25rem;
}

.ohm-result-card {
  background: var(--n-panel-strong);
  border: 1px solid var(--n-line);
  border-radius: 0.75rem;
  min-width: 0;
  padding: 0.9rem;
}

.ohm-result-card[data-state='ready'] {
  border-color: var(--n-accent);
}

.ohm-result-card-top {
  color: var(--n-muted);
  font-size: 0.72rem;
}

.ohm-result-card strong {
  display: block;
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  margin: 1rem 0 0.5rem;
  overflow-wrap: anywhere;
}

.ohm-result-card [data-result-badge] {
  color: var(--n-muted);
  font-size: 0.7rem;
}

@media (max-width: 760px) {
  .ohm-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .ohm-controls {
    border-bottom: 1px solid var(--n-line);
    border-right: 0;
    padding-bottom: 1rem;
    padding-right: 0;
  }

  .ohm-stage {
    padding-left: 0;
  }

  .ohm-result-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .ohm-intro {
    align-items: flex-start;
    flex-direction: column;
  }

  .ohm-status {
    align-self: flex-start;
  }

  .ohm-preset-list {
    grid-template-columns: 1fr;
  }

  .ohm-preset-list button {
    border-bottom: 1px solid var(--n-line);
    border-right: 0;
    text-align: center;
  }

  .ohm-preset-list button:last-child {
    border-bottom: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .circuit-trace {
    animation: none;
  }
}