.page-contact {
  --pc-edge: rgba(53, 242, 192, .18);
  --pc-soft: rgba(20, 58, 42, .45);
  --pc-gap: clamp(20px, 3vw, 34px);
}

/* breadcrumbs */
.page-contact .crumbs {
  padding-top: calc(var(--head-h) + 26px);
}
.page-contact .crumbs-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 12.5px;
  color: var(--stone);
}
.page-contact .crumbs-list li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--stone);
}
.page-contact .crumbs-list a {
  color: var(--grey);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease);
}
.page-contact .crumbs-list a:hover,
.page-contact .crumbs-list a:focus-visible {
  color: var(--mint);
  border-bottom-color: var(--mint);
}
.page-contact .crumbs-list [aria-current="page"] {
  color: var(--mint);
}

/* hero */
.page-contact .contact-hero {
  position: relative;
  padding-block: clamp(34px, 5vw, 60px) clamp(28px, 4vw, 46px);
}
.page-contact .contact-hero::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--pc-edge) 20%, rgba(138, 124, 255, .22) 62%, transparent);
  pointer-events: none;
}
.page-contact .hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 46px);
}
.page-contact .hero-lede {
  margin: 18px 0 0;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--grey);
}
.page-contact .hero-side {
  border-top: 1px solid var(--line);
  padding-top: 20px;
}
.page-contact .side-note {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--stone);
}
.page-contact .hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
}
.page-contact .hero-side-note {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--stone);
  max-width: 40ch;
}

/* scope */
.page-contact .contact-scope {
  padding-block: clamp(34px, 5vw, 62px);
}
.page-contact .scope-list {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}
.page-contact .scope-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px 18px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}
.page-contact .scope-index {
  font-size: 20px;
  line-height: 1;
  color: var(--stone);
  letter-spacing: -.02em;
}
.page-contact .scope-title {
  margin: 0 0 8px;
  font-size: clamp(17px, 2.2vw, 21px);
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--white);
  transform: skewX(-1.4deg);
}
.page-contact .scope-text {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--grey);
}
.page-contact .scope-out {
  margin: 24px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--stone);
  max-width: 68ch;
}
.page-contact .scope-out a {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 192, .35);
  transition: border-color var(--t) var(--ease), color var(--t) var(--ease);
}
.page-contact .scope-out a:hover,
.page-contact .scope-out a:focus-visible {
  color: var(--white);
  border-bottom-color: var(--orange);
}

/* channels */
.page-contact .contact-channels {
  padding-block: clamp(30px, 4.5vw, 56px);
}
.page-contact .channel-list {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}
.page-contact .channel-row {
  display: grid;
  gap: 7px;
  padding: 20px 22px;
  border-left: 2px solid var(--line);
  border-radius: 0 14px 14px 0;
  background: linear-gradient(100deg, var(--pc-soft), rgba(20, 58, 42, .08));
  transition: border-color var(--t) var(--ease), background var(--t) var(--ease);
}
.page-contact .channel-row:hover {
  border-left-color: var(--mint);
  background: linear-gradient(100deg, rgba(20, 58, 42, .72), rgba(20, 58, 42, .16));
}
.page-contact .channel-row--mail {
  border-left-color: var(--mint);
}
.page-contact .channel-row--tel {
  border-left-color: var(--orange);
}
.page-contact .channel-row--addr {
  border-left-color: var(--violet);
}
.page-contact .channel-key {
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--stone);
}
.page-contact .channel-value {
  font-size: clamp(15px, 2.6vw, 20px);
  line-height: 1.5;
  color: var(--white);
  overflow-wrap: anywhere;
}
.page-contact .channel-note {
  font-size: 12.5px;
  line-height: 1.72;
  color: var(--grey);
  max-width: 52ch;
}

/* feedback elements */
.page-contact .contact-elements {
  padding-block: clamp(34px, 5vw, 62px);
}
.page-contact .elements-grid {
  gap: clamp(26px, 4vw, 46px);
}
.page-contact .elements-intro .prose {
  margin: 16px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--grey);
  max-width: 40ch;
}
.page-contact .elements-count {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  margin: 22px 0 0;
  padding: 7px 14px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mint);
  border: 1px solid var(--pc-edge);
  border-radius: 999px;
}
.page-contact .elements-count .num {
  font-size: 17px;
  letter-spacing: 0;
}
.page-contact .element-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}
.page-contact .element-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(8, 18, 14, .45);
  transition: border-color var(--t) var(--ease), background var(--t) var(--ease);
}
.page-contact .element-item:hover {
  border-color: var(--pc-edge);
  background: rgba(20, 58, 42, .5);
}
.page-contact .element-box {
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  margin-top: 3px;
  position: relative;
  border: 1.5px solid var(--mint);
  border-radius: 4px;
  background: rgba(53, 242, 192, .12);
}
.page-contact .element-box::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 1px;
  width: 5px;
  height: 10px;
  border-right: 2px solid var(--mint);
  border-bottom: 2px solid var(--mint);
  transform: rotate(42deg);
}
.page-contact .element-title {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
  letter-spacing: -.01em;
}
.page-contact .element-text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--grey);
}

/* flow */
.page-contact .contact-flow {
  padding-block: clamp(34px, 5vw, 62px) clamp(28px, 4vw, 46px);
}
.page-contact .flow-figure {
  margin: clamp(24px, 3.5vw, 38px) 0 0;
  padding: 0;
}
.page-contact .flow-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 1380px;
  margin: 0 auto;
  padding-inline: var(--gutter);
  border-radius: 0;
  object-fit: cover;
  opacity: .8;
}
.page-contact .flow-axis {
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
.page-contact .flow-step {
  position: relative;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}
.page-contact .flow-dot {
  position: absolute;
  top: -5px;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--night);
  border: 2px solid var(--mint);
}
.page-contact .flow-index {
  display: block;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--stone);
  margin-bottom: 10px;
}
.page-contact .flow-title {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--white);
  transform: skewX(-1.4deg);
}
.page-contact .flow-text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--grey);
  max-width: 34ch;
}

/* collab */
.page-contact .contact-collab {
  padding-block: clamp(30px, 4.5vw, 56px);
}
.page-contact .collab-panel {
  padding: clamp(24px, 3.4vw, 40px);
  border-radius: 20px;
  background: linear-gradient(150deg, rgba(138, 124, 255, .14), rgba(20, 58, 42, .5) 58%, rgba(8, 18, 14, .6));
  border: 1px solid rgba(138, 124, 255, .22);
}
.page-contact .collab-text {
  margin: 18px 0 24px;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--grey);
}
.page-contact .collab-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}
.page-contact .collab-list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: baseline;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(232, 238, 234, .09);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--grey);
}
.page-contact .collab-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}
.page-contact .collab-key {
  font-family: var(--mono);
  font-size: 13px;
  padding: 3px 10px;
  border-radius: 6px;
  color: var(--night);
  background: var(--mint);
  letter-spacing: .06em;
}
.page-contact .collab-list li:nth-child(2) .collab-key {
  background: var(--orange);
}
.page-contact .collab-list li:nth-child(3) .collab-key {
  background: var(--violet);
  color: var(--white);
}
.page-contact .collab-desc {
  color: var(--grey);
}

/* quiet zone */
.page-contact .contact-quiet {
  position: relative;
  margin-top: clamp(40px, 7vw, 96px);
  min-height: clamp(320px, 46vw, 520px);
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  background: var(--lamp);
}
.page-contact .quiet-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .34;
  pointer-events: none;
}
.page-contact .contact-quiet::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(8, 18, 14, .9) 0%, rgba(11, 31, 22, .62) 46%, rgba(8, 18, 14, .95) 100%);
  pointer-events: none;
}
.page-contact .quiet-inner {
  position: relative;
  z-index: 1;
  padding-block: clamp(40px, 6vw, 76px);
}
.page-contact .quiet-line {
  margin: 0;
  font-size: clamp(20px, 3.6vw, 30px);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.45;
  color: var(--white);
  transform: skewX(-1.5deg);
  max-width: 24ch;
}
.page-contact .quiet-side {
  margin: 20px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--grey);
  max-width: 52ch;
}
.page-contact .quiet-side a {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 192, .35);
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease);
}
.page-contact .quiet-side a:hover,
.page-contact .quiet-side a:focus-visible {
  color: var(--white);
  border-bottom-color: var(--orange);
}

/* tablet and up */
@media (min-width: 720px) {
  .page-contact .channel-list {
    gap: 16px;
  }
  .page-contact .element-list {
    gap: 16px;
  }
  .page-contact .flow-axis {
    grid-template-columns: repeat(2, 1fr);
    gap: 28px 32px;
  }
  .page-contact .scope-item {
    grid-template-columns: 52px 1fr;
    align-items: start;
  }
}

/* desktop */
@media (min-width: 960px) {
  .page-contact .hero-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .7fr);
    align-items: end;
    gap: clamp(38px, 5vw, 72px);
  }
  .page-contact .hero-side {
    border-top: 0;
    border-left: 1px solid var(--line);
    padding-top: 0;
    padding-left: clamp(22px, 2.6vw, 34px);
  }
  .page-contact .scope-item {
    grid-template-columns: 68px 1fr;
    padding: 26px 0;
  }
  .page-contact .scope-index {
    font-size: 26px;
  }
  .page-contact .flow-axis {
    grid-template-columns: repeat(4, 1fr);
    gap: 26px;
  }
  .page-contact .flow-text {
    max-width: none;
  }
}
</main>
```
```