.page-contact {
  --contact-cardpad: 20px;
  --contact-radius: 2px;
  padding: 28px 0 72px;
}

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

.page-contact a {
  color: var(--grass);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 面包屑 */
.page-contact .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 26px;
  font-size: 13px;
  color: var(--muted);
}

.page-contact .breadcrumb__item {
  color: var(--muted);
  text-decoration: none;
}

.page-contact .breadcrumb__item:hover {
  color: var(--grass);
}

.page-contact .breadcrumb__item--current {
  color: var(--fg);
}

.page-contact .breadcrumb__sep {
  color: var(--dim);
}

/* 首屏 */
.page-contact .contact-head {
  margin-bottom: 30px;
}

.page-contact .contact-head h1 {
  margin: 12px 0 16px;
  font-size: clamp(1.85rem, 6.2vw, 3rem);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--fg);
}

.page-contact .contact-head__lede {
  max-width: 62ch;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-contact .contact-head__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-contact .contact-head__meta li {
  position: relative;
  padding-left: 16px;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.page-contact .contact-head__meta li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 1px;
  background: var(--grass);
}

.page-contact .contact-hero {
  margin: 0 0 40px;
  border: 1px solid var(--line);
}

/* 主体两栏 */
.page-contact .contact-body {
  display: grid;
  gap: 40px;
}

.page-contact .rail-title {
  position: relative;
  margin-bottom: 14px;
  padding-left: 14px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-contact .rail-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 7px;
  height: 1px;
  background: var(--grass);
}

.page-contact .contact-rail {
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-contact .channel-card {
  display: grid;
  gap: 10px;
  padding: var(--contact-cardpad);
  background: var(--board);
  border: 1px solid var(--line);
  border-top: 2px solid var(--grass);
  border-radius: var(--contact-radius);
}

.page-contact .channel-card__kind {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--grass);
}

.page-contact .channel-card__value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 15px;
  line-height: 1.55;
  letter-spacing: 0.02em;
  color: var(--fg);
  word-break: break-word;
  overflow-wrap: anywhere;
}

.page-contact .channel-card__desc {
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-contact .copy-btn {
  justify-self: start;
  padding: 8px 14px;
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--fg);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--contact-radius);
  cursor: pointer;
  transition: border-color 160ms ease, color 160ms ease;
}

.page-contact .copy-btn:hover,
.page-contact .copy-btn:focus-visible {
  border-color: var(--grass);
  color: var(--grass);
}

.page-contact .copy-btn.is-copied {
  border-color: var(--grass);
  color: var(--grass);
}

/* 右侧内容 */
.page-contact .contact-flow {
  display: grid;
  min-width: 0;
}

.page-contact .flow-section {
  padding: 30px 0;
  border-top: 1px solid var(--line);
  transition: border-color 220ms ease;
}

.page-contact .flow-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-contact .flow-section.is-current {
  border-top-color: var(--grass);
}

.page-contact .flow-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 14px;
}

.page-contact .flow-head__idx {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--grass);
}

.page-contact .flow-head h2 {
  font-size: clamp(1.3rem, 4.4vw, 1.9rem);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--fg);
}

.page-contact .flow-lede {
  max-width: 58ch;
  margin-bottom: 22px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-contact .note {
  margin-top: 16px;
  padding-left: 14px;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--muted);
  border-left: 2px solid var(--line);
}

/* 纠错三步 */
.page-contact .steps {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-contact .steps__item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 4px 14px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

.page-contact .steps__item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-contact .steps__num {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 22px;
  line-height: 1.25;
  letter-spacing: 0.04em;
  color: var(--signal);
}

.page-contact .steps__title {
  font-size: 17px;
  font-weight: 700;
  color: var(--fg);
}

.page-contact .steps__item p {
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

/* 合作方向 */
.page-contact .coop-grid {
  display: grid;
  gap: 1px;
  margin-bottom: 28px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--contact-radius);
}

.page-contact .coop-cell {
  display: grid;
  gap: 8px;
  align-content: start;
  padding: 22px 20px;
  background: var(--board);
}

.page-contact .coop-cell__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ice);
}

.page-contact .coop-cell h3 {
  font-size: 17.5px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--fg);
}

.page-contact .coop-cell p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-contact .coop-cell__start {
  margin-top: 2px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-contact .coop-cell__start span {
  margin-right: 8px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--grass);
}

.page-contact .coop-visual {
  margin: 0;
  border: 1px solid var(--line);
}

/* 回复节奏 */
.page-contact .pace-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-contact .pace-row {
  display: grid;
  gap: 8px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.page-contact .pace-row:last-child {
  border-bottom: 1px solid var(--line);
}

.page-contact .pace-row__top {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 16px;
}

.page-contact .pace-row__kind {
  font-size: 16px;
  font-weight: 700;
  color: var(--fg);
}

.page-contact .pace-row__time {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--signal);
}

.page-contact .pace-row p {
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

/* 主体与备案 */
.page-contact .flow-section--quiet {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-contact .entity-line {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  margin-top: 22px;
  padding: 12px 14px;
  background: var(--steel);
  border-left: 2px solid var(--line);
  border-radius: var(--contact-radius);
}

.page-contact .entity-line__label {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-contact .entity-line__value {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* 平板及以上 */
@media (min-width: 680px) {
  .page-contact .coop-grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-contact .steps__item {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 4px 20px;
  }

  .page-contact .steps__num {
    font-size: 26px;
  }
}

/* 桌面：左侧渠道卡固定，右侧内容纵向下滚 */
@media (min-width: 1024px) {
  .page-contact {
    padding: 40px 0 96px;
  }

  .page-contact .contact-hero {
    margin-bottom: 48px;
  }

  .page-contact .contact-body {
    grid-template-columns: 320px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-contact .contact-rail {
    position: sticky;
    top: 32px;
  }

  .page-contact .contact-flow {
    gap: 0;
  }

  .page-contact .flow-section {
    padding: 40px 0;
  }

  .page-contact .flow-lede {
    font-size: 16px;
  }
}

@media (min-width: 1280px) {
  .page-contact .contact-body {
    grid-template-columns: 360px minmax(0, 1fr);
    gap: 72px;
  }
}
<<<END>>>