:root {
  --n-ink: #17313b;
  --n-muted: #5d7379;
  --n-paper: #f4f8f5;
  --n-surface: #fff;
  --n-line: #c9d9d4;
  --n-water: #277b91;
  --n-water-soft: #d8eef0;
  --n-gravel: #c7a77d;
  --n-accent: #d96f4f;
  --n-accent-ink: #fff;
  --n-error: #a33632;
  --n-shadow: #dbe6e2;
}

.theme-dark {
  --n-ink: #edf7f4;
  --n-muted: #b1c8c5;
  --n-paper: #17282d;
  --n-surface: #21383d;
  --n-line: #49666a;
  --n-water: #72c5d0;
  --n-water-soft: #244c55;
  --n-gravel: #d5b583;
  --n-accent: #ef9474;
  --n-accent-ink: #251512;
  --n-error: #ff9b91;
  --n-shadow: #101a1c;
}

.atvwc-root {
  --n-card: var(--n-surface);
  --n-field: var(--n-paper);
  --n-focus: var(--n-water);

  color: var(--n-ink);
  background: var(--n-paper);
  border: 1px solid var(--n-line);
  border-radius: 1.5rem;
  box-shadow: 0 1rem 2.5rem var(--n-shadow);
  padding: clamp(1rem, 3vw, 2rem);
}

.atvwc-panel-topline,
.atvwc-result-heading,
.atvwc-footnotes {
  align-items: flex-start;
  display: flex;
  gap: 1rem;
  justify-content: space-between;
}

.atvwc-step,
.atvwc-eyebrow,
.atvwc-subtitle,
.atvwc-help,
.atvwc-result-hint,
.atvwc-empty,
.atvwc-error,
.atvwc-footnotes,
.atvwc-control-label {
  margin: 0;
}

.atvwc-step,
.atvwc-eyebrow {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: .02em;
}

.atvwc-step {
  color: var(--n-water);
  font-size: .75rem;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.atvwc-subtitle,
.atvwc-help,
.atvwc-result-hint,
.atvwc-empty,
.atvwc-footnotes {
  color: var(--n-muted);
  font-size: .9rem;
  line-height: 1.5;
}

.atvwc-unit-control,
.atvwc-shapes {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
}

.atvwc-unit-control {
  align-items: center;
  justify-content: flex-end;
}

.atvwc-unit-control button,
.atvwc-shape,
.atvwc-reset {
  background: var(--n-card);
  border: 1px solid var(--n-line);
  border-radius: .7rem;
  color: var(--n-ink);
  cursor: pointer;
  font: inherit;
  min-height: 2.6rem;
  padding: .55rem .8rem;
}

.atvwc-unit-control button[aria-pressed="true"],
.atvwc-shape.is-active {
  background: var(--n-water-soft);
  border-color: var(--n-water);
  color: var(--n-ink);
  font-weight: 700;
}

.atvwc-layout {
  display: grid;
  gap: 0;
  grid-template-columns: minmax(0, 1.1fr) minmax(18rem, .9fr);
  margin-top: 0;
}

.atvwc-panel {
  padding: .25rem 0;
}

.atvwc-panel h2 {
  font-size: 1.1rem;
  margin: 0;
}

.atvwc-form-panel {
  border-right: 1px solid var(--n-line);
  padding-right: clamp(1rem, 3vw, 2rem);
}

.atvwc-visual-panel {
  min-height: 0;
  padding-left: clamp(1rem, 3vw, 2rem);
}

.atvwc-reset {
  min-height: 2.25rem;
  padding: .35rem .65rem;
}

.atvwc-fieldset {
  border: 0;
  margin: 1.25rem 0 0;
  padding: 0;
}

.atvwc-fieldset legend {
  font-weight: 700;
  margin-bottom: .6rem;
}

.atvwc-input-grid {
  display: grid;
  gap: .8rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 1rem;
}

.atvwc-field {
  display: grid;
  gap: .35rem;
  min-width: 0;
}

.atvwc-field > span {
  font-size: .86rem;
  font-weight: 700;
}

.atvwc-field input {
  background: var(--n-field);
  border: 1px solid var(--n-line);
  border-radius: .65rem;
  box-sizing: border-box;
  color: var(--n-ink);
  font: inherit;
  min-height: 2.7rem;
  min-width: 0;
  padding: .55rem .65rem;
  width: 100%;
}

.atvwc-field input:focus-visible,
.atvwc-unit-control button:focus-visible,
.atvwc-shape:focus-visible,
.atvwc-reset:focus-visible {
  outline: 3px solid var(--n-focus);
  outline-offset: 2px;
}

.atvwc-bow-note {
  display: none;
}

.atvwc-root[data-shape="bow"] .atvwc-bow-note {
  display: block;
}

.atvwc-scene-header {
  align-items: center;
  display: flex;
  justify-content: space-between;
}

.atvwc-scene-kicker {
  color: var(--n-muted);
  font-size: .82rem;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.atvwc-tank-stage {
  align-items: center;
  background: var(--n-water-soft);
  border: 1px solid var(--n-line);
  border-radius: .9rem;
  display: flex;
  height: 10rem;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.atvwc-tank {
  background: var(--n-field);
  border: .35rem solid var(--n-water);
  border-radius: .8rem .8rem 1.2rem 1.2rem;
  bottom: 1.2rem;
  height: 6.4rem;
  overflow: hidden;
  position: absolute;
  width: 10rem;
}

.atvwc-root[data-shape="cylindrical"] .atvwc-tank {
  border-radius: 50%;
  height: 7rem;
  width: 7rem;
}

.atvwc-root[data-shape="bow"] .atvwc-tank {
  border-radius: .8rem 2.8rem 2.8rem .8rem;
  transform: perspective(14rem) rotateY(-8deg);
}

.atvwc-water,
.atvwc-gravel {
  bottom: 0;
  left: 0;
  position: absolute;
  width: 100%;
}

.atvwc-water {
  background: var(--n-water);
  height: var(--water-level, 70%);
  opacity: .82;
  transition: height .25s ease;
}

.atvwc-gravel {
  background: var(--n-gravel);
  height: 13%;
  opacity: .9;
}

.atvwc-glass-line {
  border: 2px solid var(--n-surface);
  border-radius: .5rem;
  height: 82%;
  left: 8%;
  opacity: .7;
  position: absolute;
  top: 8%;
  width: 84%;
}

.atvwc-result-heading {
  align-items: center;
  margin-top: 1.25rem;
}

.atvwc-result-heading h2 {
  font-size: clamp(1.8rem, 5vw, 2.7rem);
  line-height: 1.05;
  margin: .25rem 0 0;
}

.atvwc-result-heading p {
  color: var(--n-accent);
  font-size: .95rem;
  font-weight: 800;
  margin: .4rem 0 0;
}

.atvwc-scale {
  background: var(--n-water-soft);
  border-radius: 999px;
  color: var(--n-ink);
  font-size: .8rem;
  font-weight: 800;
  padding: .35rem .6rem;
  text-align: center;
}

.atvwc-result-grid {
  display: grid;
  gap: .65rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 1rem;
}

.atvwc-result-card {
  background: var(--n-field);
  border: 1px solid var(--n-line);
  border-radius: .75rem;
  display: grid;
  gap: .35rem;
  min-height: 4.7rem;
  padding: .75rem;
}

.atvwc-result-card span {
  color: var(--n-muted);
  font-size: .78rem;
}

.atvwc-result-card strong {
  font-size: 1.15rem;
}

.atvwc-result-card-highlight {
  border-color: var(--n-accent);
}

.atvwc-footnotes {
  flex-wrap: wrap;
  gap: .6rem 1rem;
  padding-top: 1rem;
}

.atvwc-stage-note {
  align-items: flex-start;
  bottom: 1rem;
  display: grid;
  gap: .1rem;
  left: 1rem;
  position: absolute;
}

.atvwc-stage-note strong {
  color: var(--n-ink);
  font-size: .95rem;
}

.atvwc-stage-note span,
.atvwc-level-mark {
  color: var(--n-muted);
  font-size: .72rem;
}

.atvwc-level-mark {
  position: absolute;
  right: 1rem;
}

.atvwc-level-mark-top {
  top: 1rem;
}

.atvwc-level-mark-bottom {
  bottom: 1rem;
}

.atvwc-error {
  color: var(--n-error);
  font-weight: 700;
  margin-top: .75rem;
}

.atvwc-root.has-results .atvwc-empty,
.atvwc-root.has-error .atvwc-empty {
  display: none;
}

.atvwc-root.has-error .atvwc-result-card strong,
.atvwc-root.has-error .atvwc-footnotes strong {
  color: var(--n-muted);
}

@media (max-width: 760px) {
  .atvwc-layout {
    display: block;
  }

  .atvwc-unit-control {
    justify-content: flex-start;
    margin-top: 1rem;
  }

  .atvwc-visual-panel {
    border-top: 1px solid var(--n-line);
    margin-top: 1.25rem;
    padding-left: 0;
    padding-top: 1.25rem;
  }

  .atvwc-form-panel {
    border-right: 0;
    padding-right: 0;
  }

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

@media (max-width: 430px) {
  .atvwc-input-grid,
  .atvwc-result-grid {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .atvwc-water {
    transition: none;
  }
}