.page-contact {
  --co-rail-top: calc(var(--header-h) + 20px);
}

.page-contact a:focus-visible {
  outline: 2px solid var(--c-neon);
  outline-offset: 2px;
}

/* 首屏 */
.page-contact .co-hero {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  padding-block: clamp(22px, 4vw, 44px) clamp(32px, 5vw, 60px);
}

.page-contact .co-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(2.125rem, 7vw, 3.75rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--c-text);
}

.page-contact .co-hero__lede {
  margin: clamp(16px, 2vw, 22px) 0 0;
  max-width: 54ch;
  color: var(--c-text-soft);
}

.page-contact .co-hero__points {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
  max-width: 56ch;
}

.page-contact .co-hero__points li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  font-size: var(--fs-14);
  color: var(--c-text-soft);
}

.page-contact .co-hero__code {
  flex: none;
  min-width: 68px;
  padding-left: 8px;
  border-left: 2px solid var(--c-amber);
  font-size: var(--fs-12);
  color: var(--c-amber-ink);
}

.page-contact .co-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: clamp(22px, 3vw, 30px) 0 0;
}

.page-contact .co-jump {
  display: inline-flex;
  align-items: center;
  padding: 11px 18px;
  border: 1px solid var(--c-amber);
  background: var(--c-navy);
  color: var(--c-on-dark);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  transition: background var(--t-base) var(--ease), color var(--t-base) var(--ease),
    border-color var(--t-base) var(--ease);
}

.page-contact .co-jump:hover {
  background: var(--c-amber);
  color: var(--c-ink);
}

.page-contact .co-jump--ghost {
  background: transparent;
  color: var(--c-navy);
  border-color: var(--c-line-strong);
}

.page-contact .co-jump--ghost:hover {
  background: var(--c-amber);
  color: var(--c-ink);
  border-color: var(--c-amber);
}

.page-contact .co-quick {
  padding: clamp(20px, 3vw, 30px);
  background: var(--c-navy);
  border: 1px solid var(--c-navy);
  color: var(--c-on-dark);
}

.page-contact .co-quick__title {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-size: var(--fs-20);
  font-weight: 600;
  color: var(--c-on-dark);
}

.page-contact .co-quick__list {
  margin: 0;
  display: grid;
}

.page-contact .co-quick__row {
  display: grid;
  gap: 6px;
  padding: 14px 0;
  border-top: 1px solid var(--c-line-dark);
}

.page-contact .co-quick__row dt {
  font-size: var(--fs-14);
  font-weight: 600;
  color: var(--c-amber);
}

.page-contact .co-quick__row dd {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--c-on-dark-soft);
}

.page-contact .co-quick__note {
  margin: 18px 0 0;
  font-size: var(--fs-14);
  color: var(--c-on-dark-soft);
}

.page-contact .co-quick__link {
  color: var(--c-neon);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 区段与标题 */
.page-contact .co-sec {
  padding-block: clamp(36px, 5.5vw, 72px);
  border-top: 1px solid var(--c-line);
}

.page-contact .co-sec--tight {
  padding-bottom: clamp(40px, 6vw, 80px);
}

.page-contact .co-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 20px;
  padding-bottom: 14px;
  margin-bottom: clamp(20px, 3vw, 34px);
  border-bottom: 1px solid var(--c-line-strong);
}

.page-contact .co-head__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(1.375rem, 2.6vw, 2rem);
  letter-spacing: -0.01em;
  color: var(--c-text);
}

.page-contact .co-head__meta {
  margin: 0 0 0 auto;
  font-size: var(--fs-14);
  color: var(--c-text-mute);
}

/* 三类合作 */
.page-contact .co-types {
  display: grid;
  gap: var(--gap);
}

.page-contact .co-type {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(20px, 2.6vw, 28px);
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-top: 3px solid var(--c-navy);
  transition: transform var(--t-base) var(--ease), box-shadow var(--t-base) var(--ease),
    border-color var(--t-base) var(--ease);
}

.page-contact .co-type:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-1);
}

.page-contact .co-type--build {
  border-top-color: var(--c-green);
}

.page-contact .co-type--fix {
  border-top-color: var(--c-brick);
}

.page-contact .co-type__code {
  margin: 0;
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--c-text-mute);
}

.page-contact .co-type__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: var(--fs-20);
  font-weight: 600;
  color: var(--c-text);
}

.page-contact .co-type__who {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--c-text-soft);
}

.page-contact .co-type__list {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-contact .co-type__list li {
  position: relative;
  padding-left: 18px;
  font-size: var(--fs-14);
  color: var(--c-text-soft);
}

.page-contact .co-type__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 8px;
  height: 1px;
  background: var(--c-amber);
}

.page-contact .co-type__foot {
  margin: auto 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--c-line);
  font-size: var(--fs-14);
  color: var(--c-text-mute);
}

/* 入驻流程 */
.page-contact .co-flow__grid {
  display: grid;
  gap: clamp(24px, 3vw, 44px);
}

.page-contact .co-steps {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-contact .co-step {
  position: relative;
}

.page-contact .co-step::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 38px;
  bottom: -2px;
  width: 1px;
  background: var(--c-line-strong);
}

.page-contact .co-step:last-child::before {
  display: none;
}

.page-contact .co-step__summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  cursor: pointer;
  list-style: none;
}

.page-contact .co-step__summary::-webkit-details-marker {
  display: none;
}

.page-contact .co-step__num {
  flex: none;
  width: 40px;
  height: 26px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  background: var(--c-surface);
  border: 1px solid var(--c-line-strong);
  color: var(--c-navy);
  transition: background var(--t-base) var(--ease), color var(--t-base) var(--ease),
    border-color var(--t-base) var(--ease);
}

.page-contact .co-step__name {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(1rem, 1.4vw, 1.125rem);
  color: var(--c-text);
}

.page-contact .co-step__hint {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--c-text-mute);
}

.page-contact .co-step__summary:hover .co-step__num {
  border-color: var(--c-amber);
}

.page-contact .co-step[open] > .co-step__summary .co-step__num {
  background: var(--c-navy);
  border-color: var(--c-navy);
  color: var(--c-amber);
}

.page-contact .co-step__body {
  padding: 0 0 20px 52px;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--c-text-soft);
}

.page-contact .co-step__body p {
  margin: 0 0 8px;
}

.page-contact .co-step__body p:last-child {
  margin-bottom: 0;
}

.page-contact .co-step__key {
  display: inline-block;
  min-width: 62px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--c-amber-ink);
}

.page-contact .co-flow__figure {
  margin: 0;
}

.page-contact .co-flow__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--c-line);
  background: var(--c-mist);
}

.page-contact .co-flow__caption {
  margin-top: 10px;
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--c-text-mute);
}

/* 目录共建 */
.page-contact .co-build__lede {
  max-width: 68ch;
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--c-text-soft);
}

.page-contact .co-tablewrap {
  overflow-x: auto;
  border: 1px solid var(--c-line);
  background: var(--c-surface);
}

.page-contact .co-table {
  width: 100%;
  min-width: 660px;
  border-collapse: collapse;
  font-size: var(--fs-14);
}

.page-contact .co-table caption {
  padding: 12px 16px;
  text-align: left;
  font-size: var(--fs-12);
  color: var(--c-text-mute);
  border-bottom: 1px solid var(--c-line);
}

.page-contact .co-table th {
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  background: var(--c-navy);
  color: var(--c-on-dark);
}

.page-contact .co-table td {
  padding: 12px 16px;
  vertical-align: top;
  line-height: 1.75;
  color: var(--c-text-soft);
  border-bottom: 1px solid var(--c-line);
}

.page-contact .co-table tbody tr:nth-child(even) {
  background: rgba(201, 209, 220, 0.2);
}

.page-contact .co-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-contact .co-table .mono {
  color: var(--c-text);
}

.page-contact .co-build__note {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 68ch;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--c-text-soft);
}

/* 勘误 */
.page-contact .co-fix {
  display: grid;
  gap: var(--gap);
}

.page-contact .co-fix__lede {
  margin: 0 0 18px;
  max-width: 60ch;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--c-text-soft);
}

.page-contact .co-fix__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--c-line);
}

.page-contact .co-fix__list li {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--c-line);
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--c-text-soft);
}

.page-contact .co-fix__key {
  font-size: var(--fs-12);
  color: var(--c-brick);
}

.page-contact .co-fix__aside {
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--c-paper);
  border: 1px solid var(--c-line-strong);
}

.page-contact .co-fix__aside-title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: var(--fs-16);
  font-weight: 600;
  color: var(--c-navy);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--c-line);
}

.page-contact .co-fix__aside p {
  margin: 0 0 12px;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--c-text-soft);
}

.page-contact .co-fix__aside p:last-child {
  margin-bottom: 0;
}

/* 联系方式 */
.page-contact .co-contact {
  display: grid;
  gap: var(--gap);
}

.page-contact .co-card {
  padding: clamp(20px, 3vw, 30px);
  transition: transform var(--t-base) var(--ease), box-shadow var(--t-base) var(--ease),
    border-color var(--t-base) var(--ease);
}

.page-contact .co-card--paper {
  background: var(--c-paper);
  border: 1px solid var(--c-line-strong);
}

.page-contact .co-card--paper:hover {
  transform: translateY(-2px);
  border-color: var(--c-amber);
  box-shadow: var(--shadow-1);
}

.page-contact .co-channel {
  margin: 0;
  display: grid;
}

.page-contact .co-channel__row {
  display: grid;
  gap: 5px;
  padding: 14px 0;
  border-top: 1px solid var(--c-line);
}

.page-contact .co-channel__row:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-contact .co-channel__row dt {
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--c-text-mute);
}

.page-contact .co-channel__row dd {
  margin: 0;
  display: grid;
  gap: 4px;
  font-size: var(--fs-16);
  color: var(--c-text);
}

.page-contact .co-channel__row dd .mono {
  word-break: break-all;
}

.page-contact .co-channel__hint {
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--c-text-mute);
}

.page-contact .co-card__note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--c-line-strong);
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--c-text-soft);
}

.page-contact .co-map {
  margin: 0;
  border: 1px solid var(--c-line);
  background: var(--c-mist);
}

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

.page-contact .co-map figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--c-line);
  background: var(--c-surface);
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--c-text-mute);
}

/* 处理节奏与相关入口 */
.page-contact .co-pace {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--gap);
}

.page-contact .co-pace__item {
  padding: 4px 0 4px 16px;
  border-left: 2px solid var(--c-amber);
}

.page-contact .co-pace__num {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-20);
  color: var(--c-navy);
}

.page-contact .co-pace__text {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--c-text-soft);
}

.page-contact .co-links {
  margin-top: clamp(28px, 4vw, 46px);
  display: grid;
  gap: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
}

.page-contact .co-links__item {
  display: block;
  padding: 16px 18px;
  background: var(--c-surface);
  color: var(--c-text-soft);
  font-size: var(--fs-14);
  line-height: 1.7;
  text-decoration: none;
  transition: background var(--t-base) var(--ease), color var(--t-base) var(--ease);
}

.page-contact .co-links__item:hover {
  background: var(--c-navy);
  color: var(--c-on-dark);
}

.page-contact .co-links__k {
  display: block;
  margin-bottom: 6px;
  font-size: var(--fs-12);
  color: var(--c-amber-ink);
}

.page-contact .co-links__item:hover .co-links__k {
  color: var(--c-amber);
}

/* 响应式 */
@media (min-width: 700px) {
  .page-contact .co-types {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-contact .co-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 800px) {
  .page-contact .co-pace {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-contact .co-hero {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-contact .co-fix {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    align-items: start;
  }

  .page-contact .co-contact {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-contact .co-types {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1040px) {
  .page-contact .co-flow__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    align-items: start;
  }

  .page-contact .co-steps {
    position: sticky;
    top: var(--co-rail-top);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .co-jump,
  .page-contact .co-type,
  .page-contact .co-card,
  .page-contact .co-step__num,
  .page-contact .co-links__item {
    transition: none;
  }

  .page-contact .co-type:hover,
  .page-contact .co-card--paper:hover {
    transform: none;
  }
}