.intro-grid p {
  margin: 0;
  padding-left: 24px;
  border-left: 4px solid var(--lime);
  color: var(--muted);
  font-size: 18px;
}

.flow,
.versions {
  background:
    linear-gradient(180deg, #fff 0%, var(--mint) 52%, #fff 100%);
}

.flow-line {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  max-width: 1180px;
  border-top: 4px solid var(--ink);
}

.flow-line div {
  position: relative;
  min-height: 206px;
  padding: 30px 24px 28px 0;
  border-bottom: 1px solid var(--line);
}

.flow-line div + div {
  padding-left: 24px;
  border-left: 1px solid var(--line);
}

.flow-line div::after {
  content: "";
  position: absolute;
  right: -9px;
  top: -11px;
  width: 18px;
  height: 18px;
  border-radius: 50% 50% 50% 0;
  background: var(--fresh);
  transform: rotate(-45deg);
}

.flow-line div:last-child::after {
  background: var(--lime);
}

.flow-line span {
  display: block;
  margin-bottom: 34px;
  color: var(--green);
  font-size: 13px;
  font-weight: 900;
}

.flow-line strong {
  display: block;
  color: var(--ink);
  font-size: clamp(28px, 3.5vw, 48px);
  font-weight: 900;
  line-height: .95;
}

.flow-line p,
.series-body p,
.version-grid p,
.fit-panel li,
.details-panel p,
.consult p {
  color: var(--muted);
}

.flow-line p {
  margin: 14px 0 0;
  font-weight: 700;
}

.series-stack {
  display: grid;
  max-width: 1180px;
  border-top: 4px solid var(--ink);
}

.series-block {
  display: grid;
  grid-template-columns: minmax(160px, .22fr) minmax(0, 1fr);
  gap: clamp(24px, 5vw, 64px);
  padding: 44px 0;
  border-bottom: 1px solid var(--line);
}

.series-index {
  color: var(--lime);
  font-size: 92px;
  font-weight: 900;
  line-height: .82;
}

.series-block:nth-child(even) .series-index {
  color: var(--fresh);
}

.status {
  display: inline-flex;
  margin: 0 0 14px;
  padding: 5px 11px;
  border: 2px solid var(--lime);
  border-radius: 999px;
  background: #fff;
  color: var(--green);
  font-size: 13px;
  font-weight: 900;
}

.series-body > p {
  max-width: 800px;
}

.material-list {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 22px;
}

.material-list span {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  padding: 7px 12px;
  border: 2px solid var(--mint-line);
  border-radius: 999px;
  background: #fff;
  color: var(--ink);
  font-size: 13px;
  font-weight: 900;
}

.product-summary {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
  max-width: 800px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.product-summary small {
  color: var(--green);
  font-size: 13px;
  font-weight: 900;
}

.product-summary strong {
  color: var(--ink);
  font-family: "Nunito", "Noto Sans TC", system-ui, sans-serif;
  font-size: 30px;
  font-weight: 900;
  white-space: nowrap;
}

.version-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  max-width: 1180px;
  border-top: 4px solid var(--ink);
}

.version-grid article {
  min-height: 268px;
  padding: 32px 30px 30px 0;
  border-bottom: 1px solid var(--line);
}

.version-grid article + article {
  padding-left: 30px;
  border-left: 1px solid var(--line);
}

.version-grid span {
  display: block;
  margin-bottom: 34px;
  color: var(--green);
  font-size: 13px;
  font-weight: 900;
}

.fit-panel,
.details-panel {
  display: grid;
  grid-template-columns: minmax(0, .82fr) minmax(0, 1fr);
  gap: clamp(26px, 5vw, 64px);
  align-items: start;
  max-width: 1120px;
  margin: 0 auto;
  padding-left: 34px;
  border-left: 10px solid var(--fresh);
}

.fit-panel ul {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.fit-panel li {
  position: relative;
  padding-left: 28px;
  font-weight: 800;
}

.fit-panel li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 11px;
  height: 11px;
  border-radius: 50% 50% 50% 0;
  background: var(--fresh);
  transform: rotate(-28deg);
}

.checkout {
  background:
    linear-gradient(180deg, #fff, var(--mint));
}

.consult {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
  align-items: center;
  margin: clamp(58px, 8vw, 100px) clamp(20px, 5vw, 76px);
  padding: clamp(32px, 5vw, 58px);
  border: 2px solid var(--mint-line);
  border-radius: 28px;
  background: #fff;
}

.consult::before {
  content: "";
  position: absolute;
  right: 30px;
  top: 28px;
  width: 18px;
  height: 18px;
  border-radius: 50% 50% 50% 0;
  background: var(--fresh);
  transform: rotate(-28deg);
}

.consult::after {
  content: "";
  position: absolute;
  right: 72px;
  top: 42px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--yellow);
}

.consult h2 {
  max-width: 820px;
}

.consult p {
  max-width: 760px;
}

.preview-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 28px clamp(20px, 5vw, 76px);
  border-top: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
}

.preview-footer p {
  margin: 0;
  font-family: "Nunito", "Noto Sans TC", system-ui, sans-serif;
  font-weight: 900;
}

.preview-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 14px;
  font-weight: 800;
}

@media (max-width: 1120px) {
  h2 {
    font-size: 44px;
  }

  .sound-hero,
  .fit-panel,
  .details-panel,
  .consult {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    justify-self: start;
    width: min(68vw, 420px);
  }

  .flow-line,
  .version-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .series-block {
    grid-template-columns: minmax(130px, .24fr) minmax(0, 1fr);
  }
}

@media (max-width: 760px) {
  .site-header {
    align-items: flex-start;
    padding: 12px 18px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 72px;
    right: 18px;
    left: 18px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 22px;
    background: #fff;
  }

  .site-header.is-open .site-nav {
    display: flex;
  }

  .brand small {
    display: none;
  }

  h1 {
    font-size: 48px;
    line-height: .94;
  }

  h2 {
    font-size: 34px;
    line-height: 1.16;
  }

  h3 {
    font-size: 25px;
  }

  .sound-hero {
    min-height: auto;
    padding: 72px 20px 74px;
  }

  .sound-hero::before {
    right: 20px;
    left: 20px;
  }

  .sound-hero::after {
    left: 20px;
    width: 128px;
  }

  .hero-lead,
  .intro-grid p,
  .section-head p:not(.eyebrow) {
    font-size: 16px;
  }

  .hero-visual {
    width: min(78vw, 300px);
    margin-top: 12px;
  }

  .material-note {
    right: -14px;
    bottom: 12px;
    min-width: 220px;
    padding: 14px 16px;
  }

  .material-note strong {
    font-size: 23px;
  }

  .section {
    padding: 68px 20px;
  }

  .section-head {
    margin-bottom: 28px;
  }

  .intro-grid,
  .flow-line,
  .version-grid {
    grid-template-columns: 1fr;
  }

  .intro-grid p {
    padding-left: 18px;
  }

  .flow-line div,
  .flow-line div + div,
  .version-grid article,
  .version-grid article + article {
    min-height: auto;
    padding: 24px 0;
    border-left: 0;
  }

  .flow-line div::after {
    right: auto;
    left: 0;
    top: auto;
    bottom: -9px;
  }

  .series-block {
    display: block;
    padding: 36px 0;
  }

  .series-index {
    font-size: 58px;
  }

  .series-body {
    margin-top: 20px;
  }

  .product-summary {
    align-items: start;
    flex-direction: column;
    gap: 8px;
  }

  .fit-panel,
  .details-panel {
    padding-left: 22px;
    border-left-width: 8px;
  }

  .consult {
    grid-template-columns: 1fr;
    margin-top: 58px;
    margin-bottom: 58px;
    padding: 34px 24px;
    border-radius: 22px;
  }

  .consult .button {
    width: 100%;
  }

  .preview-footer {
    display: grid;
    gap: 12px;
  }
}