.page-contact {
  --contact-border: 2px solid var(--ink-4);
  --contact-gap: clamp(1rem, 2.4vw, 1.75rem);
  background-color: var(--ink);
  color: var(--paper);
  overflow-x: clip;
}

.page-contact a {
  color: inherit;
}

.page-contact .eyebrow {
  margin: 0 0 .9rem;
  font-family: var(--f-num);
  font-size: .72rem;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-contact .section-head {
  max-width: 62ch;
  margin-bottom: clamp(1.5rem, 3vw, 2.5rem);
}

.page-contact .section-title {
  margin: 0 0 .75rem;
  font-family: var(--f-display);
  font-weight: 300;
  font-size: clamp(1.9rem, 4.8vw, 3.1rem);
  line-height: 1.05;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-contact .section-lede {
  margin: 0;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(244, 247, 242, .74);
}

/* ---------- 首屏 ---------- */
.page-contact .contact-open {
  position: relative;
  padding: clamp(2.25rem, 5vw, 4.25rem) 0 clamp(2.5rem, 5vw, 4rem);
  border-bottom: var(--contact-border);
  background:
    repeating-linear-gradient(0deg, rgba(182, 255, 59, .04) 0 1px, transparent 1px 6px),
    linear-gradient(160deg, var(--ink-2) 0%, var(--ink) 62%);
}

.page-contact .contact-open::after {
  content: "";
  position: absolute;
  right: -6%;
  top: 14%;
  width: 46%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--lime));
  transform: rotate(-6deg);
  opacity: .65;
  pointer-events: none;
}

.page-contact .breadcrumbs {
  margin-bottom: clamp(1.5rem, 3vw, 2.5rem);
}

.page-contact .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--f-num);
  font-size: .72rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--steel);
}

.page-contact .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: .5rem;
  color: var(--ink-4);
}

.page-contact .breadcrumb-link {
  color: var(--steel);
  text-decoration: none;
}

.page-contact .breadcrumb-link:hover {
  color: var(--lime);
}

.page-contact .contact-open__split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2rem, 4vw, 3.5rem);
}

.page-contact h1 {
  margin: 0 0 1.25rem;
  font-family: var(--f-display);
  font-weight: 300;
  font-size: clamp(2.25rem, 7.4vw, 4.5rem);
  line-height: 1.02;
  letter-spacing: .005em;
  color: var(--paper);
}

.page-contact .contact-open__lede {
  max-width: 52ch;
  margin: 0 0 1.75rem;
  font-size: clamp(1rem, 1.6vw, 1.12rem);
  line-height: 1.9;
  color: rgba(244, 247, 242, .8);
}

.page-contact .contact-open__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-bottom: 2rem;
}

.page-contact .contact-open__facts {
  display: grid;
  gap: .7rem;
  margin: 0;
  padding: 1.25rem 0 0;
  list-style: none;
  border-top: 1px dashed var(--ink-4);
}

.page-contact .contact-open__facts li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .35rem .9rem;
}

.page-contact .fact-key {
  min-width: 5.5rem;
  font-family: var(--f-num);
  font-size: .7rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--steel);
}

.page-contact .fact-val {
  font-family: var(--f-num);
  font-size: .92rem;
  color: var(--lime);
  word-break: break-all;
}

.page-contact .map-card {
  padding: clamp(1rem, 2vw, 1.35rem);
  border: 2px solid var(--lime);
  background: var(--ink-2);
  box-shadow: var(--shadow-hard);
}

.page-contact .map-card__top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .6rem;
  margin-bottom: .9rem;
}

.page-contact .map-card__code {
  font-family: var(--f-num);
  font-size: .76rem;
  letter-spacing: .08em;
  color: var(--steel);
}

.page-contact .map-card__frame {
  margin: 0;
}

.page-contact .map-card__legend {
  display: grid;
  gap: .5rem;
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
  font-size: .8rem;
  color: rgba(244, 247, 242, .72);
}

.page-contact .map-card__legend li {
  display: flex;
  align-items: center;
  gap: .55rem;
}

.page-contact .dot {
  display: inline-block;
  flex: 0 0 auto;
  width: .6rem;
  height: .6rem;
}

.page-contact .dot--lime {
  background: var(--lime);
}

.page-contact .dot--orange {
  background: var(--orange);
}

/* ---------- 通用分节 ---------- */
.page-contact .contact-block {
  padding: clamp(2.75rem, 6vw, 5rem) 0;
}

.page-contact .contact-block--alt {
  background: var(--ink-2);
  border-block: var(--contact-border);
}

/* ---------- 联系渠道 ---------- */
.page-contact .channel-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--contact-gap);
}

.page-contact .channel-card {
  display: flex;
  flex-direction: column;
  gap: .85rem;
  padding: 1.25rem;
  border: 2px solid var(--ink-4);
  background: var(--ink-3);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-contact .channel-card:hover {
  transform: translateY(-4px);
  border-color: var(--lime);
  box-shadow: var(--shadow-hard);
}

.page-contact .channel-card--hot {
  border-color: var(--orange);
  background: linear-gradient(180deg, rgba(255, 106, 26, .12), transparent 62%), var(--ink-3);
}

.page-contact .channel-card__value {
  font-family: var(--f-num);
  font-size: .92rem;
  line-height: 1.55;
  color: var(--lime);
  text-decoration: none;
  word-break: break-all;
}

.page-contact .channel-card--hot .channel-card__value {
  color: var(--orange);
}

.page-contact .channel-card__value--text {
  color: var(--paper);
  font-size: .9rem;
}

.page-contact a.channel-card__value:hover {
  text-decoration: underline;
  text-underline-offset: .25em;
}

.page-contact .channel-card p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.8;
  color: rgba(244, 247, 242, .72);
}

/* ---------- 勘误提交 ---------- */
.page-contact .errata-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2rem, 4vw, 3.5rem);
}

.page-contact .errata-steps {
  display: grid;
  gap: 1.1rem;
  margin: 0 0 1.75rem;
  padding: 0;
  list-style: none;
}

.page-contact .errata-step {
  padding: .15rem 0 .15rem 1.35rem;
  border-left: 3px solid var(--orange);
}

.page-contact .errata-step__no {
  display: block;
  margin-bottom: .35rem;
  font-family: var(--f-num);
  font-size: .78rem;
  letter-spacing: .16em;
  color: var(--orange);
}

.page-contact .errata-step h3 {
  margin: 0 0 .4rem;
  font-family: var(--f-display);
  font-weight: 500;
  font-size: clamp(1.15rem, 2.2vw, 1.5rem);
  letter-spacing: .02em;
  color: var(--paper);
}

.page-contact .errata-step p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.85;
  color: rgba(244, 247, 242, .74);
}

.page-contact .errata-mail {
  margin: 0;
  font-size: .95rem;
  line-height: 1.8;
  color: rgba(244, 247, 242, .86);
}

.page-contact .errata-mail a {
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 106, 26, .5);
}

.page-contact .errata-figure__frame {
  border: 2px solid var(--ink-4);
  box-shadow: var(--shadow-orange);
}

.page-contact .errata-figure__cap {
  margin: .9rem 0 0;
  font-family: var(--f-num);
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--steel);
}

/* ---------- 合作折叠面板 ---------- */
.page-contact .ask-list {
  display: grid;
  gap: .9rem;
  max-width: 960px;
}

.page-contact .ask-item {
  border: 2px solid var(--ink-4);
  background: var(--ink-3);
}

.page-contact .ask-item[open] {
  border-color: var(--lime);
  box-shadow: var(--shadow-hard);
}

.page-contact .ask-item > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.05rem 1.2rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--f-display);
  font-weight: 400;
  font-size: clamp(1.15rem, 2.4vw, 1.5rem);
  letter-spacing: .02em;
  color: var(--paper);
}

.page-contact .ask-item > summary::-webkit-details-marker {
  display: none;
}

.page-contact .ask-mark {
  position: relative;
  flex: 0 0 auto;
  width: 1rem;
  height: 1rem;
}

.page-contact .ask-mark::before,
.page-contact .ask-mark::after {
  content: "";
  position: absolute;
  background: var(--lime);
}

.page-contact .ask-mark::before {
  left: 0;
  top: 50%;
  width: 100%;
  height: 2px;
  transform: translateY(-50%);
}

.page-contact .ask-mark::after {
  top: 0;
  left: 50%;
  width: 2px;
  height: 100%;
  transform: translateX(-50%);
  transition: opacity var(--dur) var(--ease);
}

.page-contact .ask-item[open] .ask-mark::after {
  opacity: 0;
}

.page-contact .ask-body {
  padding: 1rem 1.2rem 1.2rem;
  border-top: 1px dashed var(--ink-4);
}

.page-contact .ask-body p {
  margin: 0 0 .8rem;
  font-size: .92rem;
  line-height: 1.85;
  color: rgba(244, 247, 242, .76);
}

.page-contact .ask-body p:last-child {
  margin-bottom: 0;
}

.page-contact .inline-link {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(182, 255, 59, .45);
}

.page-contact .inline-link:hover {
  border-bottom-color: var(--lime);
}

/* ---------- 响应节奏 ---------- */
.page-contact .sla-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--contact-gap);
}

.page-contact .sla-card--main {
  padding: clamp(1.5rem, 3vw, 2.25rem);
  border: 2px solid var(--lime);
  background: linear-gradient(155deg, rgba(182, 255, 59, .13), transparent 66%), var(--ink-3);
  box-shadow: var(--shadow-hard);
}

.page-contact .sla-figure {
  margin: 0;
  font-family: var(--f-num);
  font-size: clamp(3.4rem, 9vw, 5.5rem);
  line-height: .9;
  letter-spacing: -.02em;
  color: var(--lime);
}

.page-contact .sla-unit {
  margin: .35rem 0 1rem;
  font-family: var(--f-num);
  font-size: .78rem;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--paper);
}

.page-contact .sla-copy {
  margin: 0;
  font-size: .92rem;
  line-height: 1.85;
  color: rgba(244, 247, 242, .78);
}

.page-contact .sla-side {
  display: grid;
  gap: .85rem;
}

.page-contact .sla-row {
  padding: 1.1rem 1.2rem;
  border: 2px solid var(--ink-4);
  background: var(--ink-3);
}

.page-contact .sla-row h3 {
  margin: 0 0 .45rem;
  font-family: var(--f-display);
  font-weight: 500;
  font-size: 1.2rem;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-contact .sla-row p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.8;
  color: rgba(244, 247, 242, .72);
}

.page-contact .sla-note {
  margin: clamp(1.5rem, 3vw, 2.25rem) 0 0;
  font-size: .92rem;
  line-height: 1.85;
  color: rgba(244, 247, 242, .72);
}

/* ---------- 到访与邮寄 ---------- */
.page-contact .visit-block {
  background: var(--cream);
  color: var(--ink);
  border-top: 2px solid var(--ink-4);
}

.page-contact .visit-block .eyebrow {
  color: var(--orange);
}

.page-contact .visit-block .section-title {
  color: var(--ink);
}

.page-contact .visit-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-contact .visit-block .visit-address {
  margin: 0 0 1rem;
  padding-left: .9rem;
  border-left: 4px solid var(--orange);
  font-family: var(--f-num);
  font-size: clamp(1rem, 2vw, 1.18rem);
  line-height: 1.7;
  color: var(--ink);
}

.page-contact .visit-block .visit-copy {
  margin: 0;
  font-size: .95rem;
  line-height: 1.9;
  color: var(--ink-3);
}

.page-contact .visit-block a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid rgba(11, 15, 14, .4);
}

.page-contact .visit-block a:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.page-contact .visit-notes {
  display: grid;
  gap: 0;
  margin: 0;
  border: 2px solid var(--ink);
  background: rgba(255, 255, 255, .4);
}

.page-contact .visit-notes > div {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: .4rem 1rem;
  padding: .85rem 1.1rem;
  border-bottom: 1px solid rgba(11, 15, 14, .18);
}

.page-contact .visit-notes > div:last-child {
  border-bottom: 0;
}

.page-contact .visit-notes dt {
  font-family: var(--f-num);
  font-size: .7rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: rgba(11, 15, 14, .62);
}

.page-contact .visit-notes dd {
  margin: 0;
  font-size: .88rem;
  color: var(--ink);
  word-break: break-all;
}

.page-contact .visit-notes dd.num {
  font-family: var(--f-num);
  font-size: .8rem;
}

.page-contact .visit-block .visit-legal {
  margin: clamp(1.5rem, 3vw, 2rem) 0 0;
  font-size: .82rem;
  line-height: 1.8;
  color: rgba(11, 15, 14, .68);
}

.page-contact .visit-block .inline-link {
  color: var(--ink);
  border-bottom-color: rgba(11, 15, 14, .38);
}

.page-contact .visit-block .inline-link:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

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

@media (min-width: 900px) {
  .page-contact .sla-grid {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
    align-items: start;
  }

  .page-contact .visit-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
  }
}

@media (min-width: 940px) {
  .page-contact .errata-split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: start;
  }
}

@media (min-width: 980px) {
  .page-contact .contact-open__split {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    align-items: start;
  }

  .page-contact .contact-open__aside {
    margin-top: 2.5rem;
  }
}

@media (min-width: 1120px) {
  .page-contact .channel-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .channel-card {
    transition: none;
  }

  .page-contact .channel-card:hover {
    transform: none;
  }

  .page-contact .ask-mark::after {
    transition: none;
  }
}