.vv-coupled-detail {
  --vv-coupled-dark: #123c2c;
  --vv-coupled-green: #267548;
  --vv-coupled-green-strong: #1d633d;
  --vv-coupled-green-soft: #eaf5ec;
  --vv-coupled-blue: #237d9d;
  --vv-coupled-blue-soft: #e9f5f6;
  --vv-coupled-gold: #a75d16;
  --vv-coupled-gold-soft: #fff6df;
  --vv-coupled-purple: #685292;
  --vv-coupled-purple-soft: #f2eef9;
  --vv-coupled-red-soft: #fff0e9;
  --vv-coupled-text: #25342a;
  --vv-coupled-muted: #607066;
  --vv-coupled-border: #d5e4d8;
  --vv-coupled-shadow: 0 18px 46px rgba(18, 60, 44, 0.08);

  color: var(--vv-coupled-text);
  margin: 0;
  padding: 0 0 72px;
}

.vv-coupled-hero {
  position: relative;
  overflow: hidden;
  max-width: 1200px;
  margin: 0 auto 56px;
  padding: 82px 48px 76px;
  border-radius: 0 0 36px 36px;
  background:
    linear-gradient(
      120deg,
      #123c2c 0%,
      #1d633d 58%,
      #318057 100%
    );
  color: #fff;
}

.vv-coupled-hero::after {
  position: absolute;
  right: -90px;
  bottom: -180px;
  width: 420px;
  height: 420px;
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 50%;
  box-shadow:
    0 0 0 54px rgba(255, 255, 255, 0.045),
    0 0 0 108px rgba(255, 255, 255, 0.025);
  content: "";
}

.vv-coupled-hero__inner {
  position: relative;
  z-index: 1;
  max-width: 900px;
}

.vv-coupled-hero__eyebrow,
.vv-coupled-kicker,
.vv-coupled-page .vv-section-kicker {
  margin: 0 0 18px;
  color: var(--vv-coupled-green);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.vv-coupled-hero__eyebrow {
  color: #bde7ca;
}

.vv-coupled-hero__title {
  max-width: 960px;
  margin: 0;
  color: #fff;
  font-size: clamp(3rem, 5vw, 5.1rem);
  line-height: 1.02;
  letter-spacing: -0.045em;
}

.vv-coupled-hero__subtitle {
  max-width: 820px;
  margin: 28px 0 0;
  color: rgba(255, 255, 255, 0.9);
  font-size: 1.28rem;
  line-height: 1.65;
}

.vv-coupled-body {
  margin: 0;
  padding: 0;
}

.vv-coupled-page {
  max-width: 1180px;
  margin: 0 auto;
  color: var(--vv-coupled-text);
}

.vv-coupled-intro,
.vv-coupled-section {
  margin: 0 0 44px;
  padding: 48px 54px;
  border: 1px solid var(--vv-coupled-border);
  border-radius: 28px;
  background: #fff;
  box-shadow: var(--vv-coupled-shadow);
}

.vv-coupled-intro {
  border-left: 6px solid var(--vv-coupled-green);
  background:
    linear-gradient(
      135deg,
      #f7fbf8 0%,
      #ffffff 72%
    );
}

.vv-coupled-section__header,
.vv-section-heading {
  max-width: 900px;
  margin: 0 0 32px;
}

.vv-coupled-page h2 {
  margin: 0 0 20px;
  color: var(--vv-coupled-dark);
  font-size: clamp(2.15rem, 3.6vw, 3.35rem);
  line-height: 1.08;
  letter-spacing: -0.035em;
}

.vv-coupled-page h3 {
  margin: 0 0 14px;
  color: var(--vv-coupled-dark);
  font-size: 1.22rem;
  line-height: 1.32;
}

.vv-coupled-page p,
.vv-coupled-page li,
.vv-coupled-page td,
.vv-coupled-page th {
  font-size: 1.02rem;
  line-height: 1.72;
}

.vv-coupled-page p {
  margin: 0 0 18px;
}

.vv-coupled-page p:last-child {
  margin-bottom: 0;
}

.vv-coupled-lead {
  max-width: 920px;
  color: var(--vv-coupled-dark);
  font-size: 1.28rem;
  font-weight: 650;
  line-height: 1.6;
}

.vv-coupled-grid,
.vv-coupled-definition-grid,
.vv-configuration-grid,
.vv-flow-grid,
.vv-biofilter-grid,
.vv-sizing-grid,
.vv-tradeoff-grid,
.vv-nutrient-grid,
.vv-monitoring-grid,
.vv-water-principles {
  display: grid;
  gap: 24px;
  align-items: stretch;
}

.vv-coupled-grid--two,
.vv-coupled-definition-grid,
.vv-biofilter-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.vv-coupled-grid--three,
.vv-monitoring-grid,
.vv-nitrification-steps {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.vv-coupled-grid--four,
.vv-configuration-grid,
.vv-flow-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.vv-sizing-grid,
.vv-tradeoff-grid,
.vv-nutrient-grid,
.vv-water-principles {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.vv-coupled-card,
.vv-definition-card,
.vv-configuration-card,
.vv-flow-card,
.vv-biofilter-card,
.vv-nitrification-card,
.vv-sizing-card,
.vv-tradeoff-card,
.vv-nutrient-card,
.vv-water-card,
.vv-monitoring-card {
  position: relative;
  min-width: 0;
  padding: 28px;
  border: 1px solid var(--vv-coupled-border);
  border-radius: 20px;
  background: #fff;
}

.vv-definition-card,
.vv-biofilter-card,
.vv-water-card {
  background: #f7fbf8;
}

.vv-configuration-card,
.vv-sizing-card {
  background: var(--vv-coupled-blue-soft);
}

.vv-flow-card,
.vv-tradeoff-card {
  background: var(--vv-coupled-gold-soft);
}

.vv-nitrification-card,
.vv-nutrient-card {
  background: var(--vv-coupled-purple-soft);
}

.vv-monitoring-card {
  background: #f2f7f9;
}

.vv-card-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 42px;
  height: 38px;
  margin: 0 0 18px;
  padding: 0 12px;
  border-radius: 999px;
  background: var(--vv-coupled-green-soft);
  color: var(--vv-coupled-green-strong);
  font-size: 0.86rem;
  font-weight: 800;
}

.vv-coupled-card__label,
.vv-coupled-card__status {
  display: block;
  margin: 0 0 12px;
  color: var(--vv-coupled-green-strong);
  font-size: 0.79rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.vv-coupled-panel {
  padding: 34px;
  border: 1px solid var(--vv-coupled-border);
  border-radius: 22px;
}

.vv-coupled-panel--positive {
  border-color: #b9dcc2;
  background: var(--vv-coupled-green-soft);
}

.vv-coupled-panel--limits {
  border-color: #ecd49d;
  background: var(--vv-coupled-gold-soft);
}

.vv-coupled-note,
.vv-coupled-warning {
  margin: 30px 0 0;
  padding: 26px 30px;
  border-radius: 18px;
}

.vv-coupled-note {
  border-left: 5px solid var(--vv-coupled-green);
  background: var(--vv-coupled-green-soft);
}

.vv-coupled-warning {
  border-left: 5px solid var(--vv-coupled-gold);
  background: var(--vv-coupled-gold-soft);
}

.vv-coupled-subsection {
  margin-top: 36px;
  padding-top: 34px;
  border-top: 1px solid var(--vv-coupled-border);
}

.vv-coupled-checklist,
.vv-sizing-checklist {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.vv-coupled-checklist li,
.vv-sizing-checklist li {
  position: relative;
  margin: 0 0 12px;
  padding-left: 30px;
}

.vv-coupled-checklist li::before,
.vv-sizing-checklist li::before {
  position: absolute;
  top: 0.55em;
  left: 4px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--vv-coupled-green);
  content: "";
}

.vv-coupled-figure {
  margin: 38px 0 0;
  padding: 18px;
  border: 1px solid var(--vv-coupled-border);
  border-radius: 24px;
  background: #f7faf8;
  box-shadow: 0 14px 36px rgba(18, 60, 44, 0.07);
}

.vv-coupled-figure__image {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 16px;
  background: #f2f8f4;
}

.vv-coupled-figure__caption {
  padding: 18px 10px 4px;
  color: var(--vv-coupled-muted);
  font-size: 0.93rem;
  line-height: 1.6;
}

.vv-coupled-table-wrap,
.vv-species-table-wrapper {
  max-width: 100%;
  margin: 28px 0 0;
  overflow-x: auto;
  border: 1px solid var(--vv-coupled-border);
  border-radius: 18px;
  background: #fff;
}

.vv-coupled-table,
.vv-species-table {
  width: 100%;
  min-width: 780px;
  border-collapse: collapse;
}

.vv-coupled-table th,
.vv-species-table th {
  padding: 16px 18px;
  background: var(--vv-coupled-dark);
  color: #fff;
  font-weight: 750;
  text-align: left;
  vertical-align: top;
}

.vv-coupled-table td,
.vv-species-table td {
  padding: 15px 18px;
  border-top: 1px solid var(--vv-coupled-border);
  vertical-align: top;
}

.vv-coupled-table tbody tr:nth-child(even),
.vv-species-table tbody tr:nth-child(even) {
  background: #f7faf8;
}

.vv-coupled-section--safety {
  border-color: #e4c0b1;
  background:
    linear-gradient(
      145deg,
      #fffaf7 0%,
      #ffffff 55%
    );
}

.vv-coupled-section--benefits {
  background: #f7fbf8;
}

.vv-coupled-section--selection {
  border-color: #c4dce5;
  background: #f5fafb;
}

.vv-coupled-section--modules {
  border-color: #bcdce1;
  background: var(--vv-coupled-blue-soft);
}

.vv-coupled-section--sources {
  background: #f6f8f6;
}

.vv-coupled-comparison {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.vv-coupled-linkline {
  margin-top: 24px;
}

.vv-coupled-page a {
  color: var(--vv-coupled-green-strong);
  font-weight: 700;
  text-decoration-color: rgba(29, 99, 61, 0.45);
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

.vv-coupled-page a:hover {
  color: var(--vv-coupled-dark);
  text-decoration-color: currentColor;
}

.vv-coupled-page a:focus-visible {
  outline: 3px solid rgba(38, 117, 72, 0.32);
  outline-offset: 4px;
  border-radius: 3px;
}

.vv-coupled-sources {
  margin: 24px 0 0;
  padding-left: 24px;
}

.vv-coupled-sources li {
  margin: 0 0 18px;
  padding-left: 8px;
}

.vv-source-note {
  display: block;
  margin-top: 5px;
  color: var(--vv-coupled-muted);
  font-size: 0.9rem;
}

.vv-coupled-page strong {
  color: var(--vv-coupled-dark);
}

.vv-coupled-page code {
  padding: 0.12em 0.38em;
  border-radius: 5px;
  background: #edf3ef;
  color: var(--vv-coupled-dark);
  font-size: 0.92em;
}