.page-contact {
  --pc-gap: clamp(20px, 3vw, 40px);
  background: var(--by-ink);
  color: var(--by-paper);
}

.page-contact img {
  max-width: 100%;
  height: auto;
}

/* ---------- 首屏 ---------- */
.page-contact .pc-hero {
  padding-top: clamp(28px, 4vw, 56px);
}

.page-contact .pc-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 56px);
  align-items: start;
}

.page-contact .pc-hero__title {
  margin: 14px 0 0;
  font-size: clamp(2.1rem, 7.4vw, 4.3rem);
  line-height: 1;
  letter-spacing: -0.02em;
  overflow-wrap: anywhere;
}

.page-contact .pc-hero__lead {
  margin: clamp(18px, 3vw, 26px) 0 0;
  max-width: 48ch;
}

.page-contact .pc-channels {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2.4vw, 22px);
}

.page-contact .pc-channel {
  border-top: 1px solid var(--by-hair-strong);
  padding-top: 14px;
  display: grid;
  gap: 6px;
}

.page-contact .pc-channel__label {
  font-family: var(--by-font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--by-mist);
}

.page-contact .pc-channel__value {
  display: inline-block;
  position: relative;
  font-family: var(--by-font-mono);
  font-size: clamp(17px, 2.4vw, 25px);
  line-height: 1.35;
  color: var(--by-lime);
  text-decoration: none;
  overflow-wrap: anywhere;
  transition: color 0.25s var(--by-ease);
}

.page-contact .pc-channel__value::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 100%;
  height: 1px;
  background: var(--by-lime);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.32s var(--by-ease);
}

.page-contact .pc-channel__value:hover,
.page-contact .pc-channel__value:focus-visible {
  color: var(--by-orange);
}

.page-contact .pc-channel__value:hover::after,
.page-contact .pc-channel__value:focus-visible::after {
  transform: scaleX(1);
  background: var(--by-orange);
}

.page-contact .pc-channel__hint {
  font-size: 14px;
  line-height: 1.7;
  color: var(--by-mist);
}

.page-contact .pc-hero__side {
  position: relative;
}

.page-contact .pc-hero__media {
  margin: 0;
  border: 1px solid var(--by-hair);
}

.page-contact .pc-hero__media img {
  display: block;
  width: 100%;
  object-fit: cover;
}

.page-contact .pc-note {
  position: relative;
  margin-top: -26px;
  margin-left: clamp(0px, 2vw, 24px);
  padding: clamp(20px, 3vw, 30px);
  box-shadow: var(--by-shadow);
}

.page-contact .pc-note__tag {
  margin: 0;
  font-family: var(--by-font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--by-ink-2);
  opacity: 0.72;
}

.page-contact .pc-note__big {
  margin: 8px 0 10px;
  font-size: clamp(1.2rem, 2.6vw, 1.6rem);
  font-weight: 800;
  line-height: 1.2;
  color: var(--by-ink-2);
}

.page-contact .pc-note__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--by-ink-2);
}

/* ---------- 三条路径 ---------- */
.page-contact .pc-paths {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: clamp(20px, 3vw, 32px);
}

.page-contact .pc-path {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(20px, 3vw, 28px);
}

.page-contact .pc-path__num {
  font-family: var(--by-font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--by-lime);
}

.page-contact .pc-path__title {
  margin: 0;
  font-size: clamp(1.1rem, 2.2vw, 1.35rem);
  line-height: 1.32;
}

.page-contact .pc-path__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--by-mist);
}

.page-contact .pc-path__link {
  margin-top: auto;
  padding-top: 12px;
  align-self: flex-start;
  font-family: var(--by-font-mono);
  font-size: 14px;
  color: var(--by-lime);
  text-decoration: none;
  border-bottom: 1px solid var(--by-hair-lime);
  overflow-wrap: anywhere;
  transition: color 0.25s var(--by-ease), border-color 0.25s var(--by-ease);
}

.page-contact .pc-path__link:hover,
.page-contact .pc-path__link:focus-visible {
  color: var(--by-orange);
  border-color: var(--by-orange);
}

/* ---------- 准备清单 ---------- */
.page-contact .pc-prep {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
  margin-top: clamp(20px, 3vw, 32px);
  align-items: start;
}

.page-contact .pc-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: clamp(20px, 3vw, 28px);
}

.page-contact .pc-group {
  margin-bottom: clamp(24px, 4vw, 34px);
  scroll-margin-top: 96px;
}

.page-contact .pc-group:last-child {
  margin-bottom: 0;
}

.page-contact .pc-group__title {
  margin: 0 0 10px;
  font-size: 1.05rem;
  line-height: 1.35;
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-contact .pc-group__title::before {
  content: "";
  width: 16px;
  height: 3px;
  background: var(--by-orange);
  flex: none;
}

.page-contact .pc-checks {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-contact .pc-check {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 13px 0;
  border-bottom: 1px solid var(--by-hair);
}

.page-contact .pc-check__box {
  position: relative;
  width: 16px;
  height: 16px;
  margin-top: 4px;
  border: 1px solid var(--by-hair-strong);
  background: var(--by-ink-2);
  flex: none;
}

.page-contact .pc-check__box::after {
  content: "";
  position: absolute;
  left: 3px;
  top: 3px;
  width: 8px;
  height: 8px;
  background: var(--by-lime);
}

.page-contact .pc-check__text {
  font-size: 15px;
  line-height: 1.72;
  color: var(--by-pale);
}

.page-contact .pc-prep__media {
  margin: 0;
}

.page-contact .pc-prep__media .by-media {
  border: 1px solid var(--by-hair);
}

.page-contact .pc-prep__media img {
  display: block;
  width: 100%;
  object-fit: cover;
}

/* ---------- 响应流程 ---------- */
.page-contact .pc-flow {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.page-contact .pc-flow__node {
  position: relative;
  padding: 0 0 26px 26px;
  border-left: 1px solid var(--by-hair-strong);
}

.page-contact .pc-flow__node:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-contact .pc-flow__node::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 3px;
  width: 9px;
  height: 9px;
  background: var(--by-lime);
}

.page-contact .pc-flow__num {
  font-family: var(--by-font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--by-mist);
}

.page-contact .pc-flow__title {
  margin: 8px 0 8px;
  font-size: clamp(1.1rem, 2.2vw, 1.3rem);
  line-height: 1.3;
}

.page-contact .pc-flow__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--by-mist);
}

.page-contact .pc-flow__note {
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 14px 18px;
  border-left: 2px solid var(--by-orange);
  background: var(--by-ink-2);
  font-size: 14px;
  line-height: 1.75;
  color: var(--by-pale);
}

/* ---------- 合作与媒体 ---------- */
.page-contact .pc-partner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
  margin-top: clamp(20px, 3vw, 32px);
  align-items: start;
}

.page-contact .pc-partner__copy .by-lead {
  margin-top: 0;
}

.page-contact .pc-partner__list {
  list-style: none;
  margin: clamp(18px, 3vw, 26px) 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-contact .pc-partner__list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--by-mist);
}

.page-contact .pc-partner__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 8px;
  height: 1px;
  background: var(--by-lime);
}

.page-contact .pc-partner__stats {
  display: grid;
  gap: clamp(18px, 2.6vw, 26px);
}

.page-contact .pc-stat {
  display: grid;
  gap: 4px;
  padding: 12px 0 12px 18px;
  border-left: 2px solid var(--by-lime);
}

.page-contact .pc-stat__num {
  font-family: var(--by-font-mono);
  font-size: clamp(2rem, 5vw, 2.8rem);
  line-height: 1;
  color: var(--by-paper);
}

.page-contact .pc-stat__label {
  font-size: 14px;
  line-height: 1.68;
  color: var(--by-mist);
}

/* ---------- 联系方式 ---------- */
.page-contact .pc-detail {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 44px);
  margin-top: clamp(20px, 3vw, 32px);
  align-items: start;
}

.page-contact .pc-detail__card {
  padding: clamp(22px, 3.4vw, 40px);
}

.page-contact .pc-detail__list {
  margin: 0;
  display: grid;
  gap: 18px;
}

.page-contact .pc-detail__list > div {
  display: grid;
  gap: 6px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--by-pale);
}

.page-contact .pc-detail__list > div:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-contact .pc-detail__list dt {
  font-family: var(--by-font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--by-ink-2);
  opacity: 0.7;
}

.page-contact .pc-detail__list dd {
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--by-line);
  overflow-wrap: anywhere;
}

.page-contact .pc-detail__list dd a {
  font-family: var(--by-font-mono);
  color: var(--by-line);
  text-decoration: none;
  border-bottom: 1px solid var(--by-ink-2);
  transition: color 0.25s var(--by-ease), border-color 0.25s var(--by-ease);
}

.page-contact .pc-detail__list dd a:hover,
.page-contact .pc-detail__list dd a:focus-visible {
  color: var(--by-orange);
  border-color: var(--by-orange);
}

.page-contact .pc-detail__heading {
  margin: 0 0 10px;
  font-size: clamp(1.1rem, 2.4vw, 1.4rem);
  line-height: 1.32;
}

.page-contact .pc-detail__text {
  margin: 0 0 clamp(16px, 2.4vw, 22px);
  font-size: 15px;
  line-height: 1.78;
  color: var(--by-mist);
}

.page-contact .pc-links {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-contact .pc-links li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--by-hair);
}

.page-contact .pc-links li:first-child {
  border-top: 1px solid var(--by-hair);
}

.page-contact .pc-links a {
  font-size: 16px;
  color: var(--by-lime);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.25s var(--by-ease), border-color 0.25s var(--by-ease);
}

.page-contact .pc-links a:hover,
.page-contact .pc-links a:focus-visible {
  color: var(--by-orange);
  border-color: var(--by-orange);
}

.page-contact .pc-links span {
  font-size: 14px;
  line-height: 1.7;
  color: var(--by-mist);
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 760px) {
  .page-contact .pc-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-contact .pc-paths {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    padding-bottom: 80px;
  }

  .page-contact .pc-path:nth-child(2) {
    margin-top: 38px;
  }

  .page-contact .pc-path:nth-child(3) {
    margin-top: 76px;
  }

  .page-contact .pc-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 28px;
  }

  .page-contact .pc-flow__node:last-child {
    border-left-color: var(--by-hair-strong);
  }

  .page-contact .pc-flow__note {
    max-width: 68ch;
  }
}

@media (min-width: 900px) {
  .page-contact .pc-prep {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-contact .pc-partner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-contact .pc-detail {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  }
}

@media (min-width: 1000px) {
  .page-contact .pc-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-contact .pc-flow__node {
    padding: 30px 24px 0 0;
    border-left: 0;
    border-top: 1px solid var(--by-hair-strong);
  }

  .page-contact .pc-flow__node:last-child {
    padding-top: 30px;
    padding-bottom: 0;
    border-top: 1px solid var(--by-hair-strong);
  }

  .page-contact .pc-flow__node::before {
    left: 0;
    top: -5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .pc-channel__value,
  .page-contact .pc-channel__value::after,
  .page-contact .pc-path__link,
  .page-contact .pc-links a,
  .page-contact .pc-detail__list dd a {
    transition: none;
  }
}
<<<END>>>