.bun {
  --c-bg: #f8f9fc;
  --c-surface: #fff;
  --c-border: #e4e8f0;
  --c-ink: #1a1d27;
  --c-muted: #6b7291;
  --c-prerenal: #3b6fd4;
  --c-prerenal-bg: #eef3fc;
  --c-prerenal-border: #c2d3f5;
  --c-normal: #2a9e6f;
  --c-normal-bg: #eafaf3;
  --c-normal-border: #b8ead5;
  --c-intrinsic: #d95f3b;
  --c-intrinsic-bg: #fdf1ee;
  --c-intrinsic-border: #f5c5b6;
  --c-input-bg: #fff;
  --r: 10px;

  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: 16px;
  overflow: hidden;
  width: 100%;
  display: grid;
}

.bun [hidden] {
  display: none;
}

.bun__disclaimer {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1rem 1.5rem;
  background: #fffbeb;
  border-bottom: 1px solid #fcd34d;
  color: #92400e;
}

.theme-dark .bun__disclaimer {
  background: #1c1708;
  border-bottom-color: #78350f;
  color: #fcd34d;
}

.bun__disclaimer-icon {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  margin-top: 0.1rem;
  color: #b45309;
}

.theme-dark .bun__disclaimer-icon {
  color: #fcd34d;
}

.bun__disclaimer-text {
  display: grid;
  gap: 0.25rem;
  font-size: 0.8rem;
  line-height: 1.5;
}

.bun__disclaimer-text strong {
  font-size: 0.82rem;
  font-weight: 800;
  color: #92400e;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.theme-dark .bun__disclaimer-text strong {
  color: #fcd34d;
}

.bun__disclaimer-text span {
  color: #78350f;
}

.theme-dark .bun__disclaimer-text span {
  color: #d97706;
}

.theme-dark .bun {
  --c-bg: #0e0f16;
  --c-surface: #161822;
  --c-border: #252838;
  --c-ink: #e8eaf5;
  --c-muted: #7880a6;
  --c-prerenal: #5b8de8;
  --c-prerenal-bg: #131b30;
  --c-prerenal-border: #1e3060;
  --c-normal: #3ec98a;
  --c-normal-bg: #0e2018;
  --c-normal-border: #1a4530;
  --c-intrinsic: #f07653;
  --c-intrinsic-bg: #251510;
  --c-intrinsic-border: #4a2015;
  --c-input-bg: #161822;
}

.bun__inputs {
  display: grid;
  gap: 1px;
  background: var(--c-border);
}

@media (min-width: 640px) {
  .bun__inputs {
    grid-template-columns: 1fr 1fr;
  }
}

.bun__field {
  background: var(--c-surface);
  padding: 1.25rem 1.5rem 1rem;
  display: grid;
  gap: 0.6rem;
}

.bun__field-label {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-muted);
}

.bun__field-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.75rem;
  align-items: center;
}

.bun__input {
  width: 100%;
  padding: 0.55rem 0.75rem;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--c-ink);
  background: var(--c-input-bg);
  border: 1.5px solid var(--c-border);
  border-radius: var(--r);
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
  min-width: 0;
}

.bun__input::placeholder {
  font-weight: 400;
  color: var(--c-border);
  font-size: 1.1rem;
}

.bun__input:focus {
  border-color: var(--c-ink);
  box-shadow: 0 0 0 3px rgba(26, 29, 39, 0.08);
}

.theme-dark .bun__input:focus {
  box-shadow: 0 0 0 3px rgba(232, 234, 245, 0.08);
}

.bun__unit-toggle {
  display: flex;
  flex-direction: column;
  gap: 3px;
  flex-shrink: 0;
}

.bun__unit-btn {
  padding: 0.3rem 0.65rem;
  font-size: 0.7rem;
  font-weight: 700;
  border: 1.5px solid var(--c-border);
  border-radius: 6px;
  background: transparent;
  color: var(--c-muted);
  cursor: pointer;
  transition: background 0.12s, color 0.12s, border-color 0.12s;
  white-space: nowrap;
  line-height: 1.4;
  letter-spacing: 0.02em;
}

.bun__unit-btn--active {
  background: var(--c-ink);
  color: var(--c-bg);
  border-color: var(--c-ink);
}

.bun__converted {
  font-size: 0.71rem;
  color: var(--c-muted);
  min-height: 1em;
  font-style: italic;
}

.bun__empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 3rem 1.5rem;
  background: var(--c-surface);
  border-top: 1px solid var(--c-border);
  color: var(--c-muted);
  font-size: 0.85rem;
  text-align: center;
}

.bun__empty-icon {
  width: 40px;
  height: 40px;
  opacity: 0.3;
  color: var(--c-ink);
}

.bun__result-hero {
  display: grid;
  background: var(--c-surface);
  border-top: 1px solid var(--c-border);
}

@media (min-width: 600px) {
  .bun__result-hero {
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }
}

.bun__result-main {
  padding: 2rem 1.5rem 1.5rem;
  display: grid;
  gap: 0.4rem;
}

.bun__result-label {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-muted);
}

.bun__result-number {
  display: flex;
  align-items: baseline;
  gap: 0.1rem;
}

.bun__result-value {
  font-size: clamp(4rem, 12vw, 6.5rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--c-ink);
  transition: color 0.3s;
}

.bun__result-value--prerenal { color: var(--c-prerenal); }
.bun__result-value--normal { color: var(--c-normal); }
.bun__result-value--intrinsic { color: var(--c-intrinsic); }

.bun__result-colon {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--c-muted);
  align-self: flex-end;
  padding-bottom: 0.6rem;
}

.bun__result-zone {
  font-size: 0.95rem;
  font-weight: 700;
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  display: inline-block;
  width: fit-content;
  transition: background 0.3s, color 0.3s;
}

.bun__result-zone--prerenal { background: var(--c-prerenal-bg); color: var(--c-prerenal); }
.bun__result-zone--normal { background: var(--c-normal-bg); color: var(--c-normal); }
.bun__result-zone--intrinsic { background: var(--c-intrinsic-bg); color: var(--c-intrinsic); }

.bun__gauge {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1rem 1.5rem 0.5rem;
}

.bun__gauge-arc {
  width: 100%;
  max-width: 200px;
  color: var(--c-ink);
}

.bun__gauge-bg {
  stroke: #e4e8f0;
  opacity: 0.4;
}

.theme-dark .bun__gauge-bg {
  stroke: #252838;
  opacity: 0.6;
}

.bun__gauge-bg--intrinsic { stroke: var(--c-intrinsic); }
.bun__gauge-bg--normal { stroke: var(--c-normal); }
.bun__gauge-bg--prerenal { stroke: var(--c-prerenal); }

.bun__gauge-arc--intrinsic .bun__gauge-bg { opacity: 0.18; }
.bun__gauge-arc--intrinsic .bun__gauge-bg--intrinsic { opacity: 1; }

.bun__gauge-arc--normal .bun__gauge-bg { opacity: 0.18; }
.bun__gauge-arc--normal .bun__gauge-bg--normal { opacity: 1; }

.bun__gauge-arc--prerenal .bun__gauge-bg { opacity: 0.18; }
.bun__gauge-arc--prerenal .bun__gauge-bg--prerenal { opacity: 1; }

.bun__gauge-labels {
  display: flex;
  justify-content: space-between;
  width: 100%;
  max-width: 200px;
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--c-muted);
  margin-top: 0.25rem;
}

.bun__gauge-label--intrinsic { color: var(--c-intrinsic); }
.bun__gauge-label--normal { color: var(--c-normal); }
.bun__gauge-label--prerenal { color: var(--c-prerenal); }

.bun__zones {
  display: grid;
  gap: 1px;
  background: var(--c-border);
}

@media (min-width: 640px) {
  .bun__zones {
    grid-template-columns: repeat(3, 1fr);
  }
}

.bun__zone {
  background: var(--c-surface);
  padding: 1rem 1.25rem;
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  transition: background 0.2s;
}

.bun__zone-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 0.15rem;
  transition: transform 0.2s;
}

.bun__zone--intrinsic .bun__zone-dot { background: var(--c-intrinsic); }
.bun__zone--normal .bun__zone-dot { background: var(--c-normal); }
.bun__zone--prerenal .bun__zone-dot { background: var(--c-prerenal); }

.bun__zone-content {
  display: grid;
  gap: 0.2rem;
}

.bun__zone-name {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.bun__zone--intrinsic .bun__zone-name { color: var(--c-intrinsic); }
.bun__zone--normal .bun__zone-name { color: var(--c-normal); }
.bun__zone--prerenal .bun__zone-name { color: var(--c-prerenal); }

.bun__zone-threshold {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--c-ink);
}

.bun__zone-desc {
  font-size: 0.7rem;
  color: var(--c-muted);
  line-height: 1.45;
}

.bun__zone--active {
  background: var(--c-prerenal-bg);
}

.bun__zone--active.bun__zone--intrinsic {
  background: var(--c-intrinsic-bg);
}

.bun__zone--active.bun__zone--normal {
  background: var(--c-normal-bg);
}

.bun__zone--active .bun__zone-dot {
  transform: scale(1.5);
}