.page-contact {
  --c-gap: clamp(64px, 9vw, 132px);
  --c-shift: 13px;
  background: linear-gradient(180deg, var(--ink-night) 0%, var(--deep-pitch) 55%, var(--ink-night) 100%);
  color: var(--text-on-dark);
}

.page-contact .section {
  padding-block: var(--c-gap);
}

.page-contact .breadcrumb {
  padding-top: clamp(18px, 3vw, 30px);
}

/* ---------- 首屏 ---------- */

.contact-open__grid {
  display: grid;
  gap: clamp(30px, 5vw, 56px);
  align-items: start;
}

@media (min-width: 900px) {
  .contact-open__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(36px, 5vw, 76px);
  }
}

.contact-open__title {
  font-family: var(--font-head);
  font-size: clamp(32px, 5.6vw, 66px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 14px 0 22px;
  max-width: 18ch;
}

.contact-open__lead {
  max-width: 56ch;
  color: var(--paper-mute);
}

.contact-open__facts {
  list-style: none;
  margin: clamp(28px, 4vw, 40px) 0 0;
  padding: 24px 0 0;
  border-top: 1px solid var(--line-graphite);
  display: grid;
  gap: 16px;
}

.contact-open__facts li {
  display: flex;
  align-items: baseline;
  gap: 16px;
  font-size: 14px;
  color: var(--paper-mute);
}

.contact-open__facts .mono {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan-signal);
  min-width: 4.5ch;
}

.contact-open__cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: clamp(28px, 4vw, 42px) 0 0;
}

.contact-open__media {
  aspect-ratio: 16 / 11;
  margin: 0;
}

/* ---------- 横向标签带 ---------- */

.page-contact .band__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 32px;
}

.page-contact .band__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--amber-tick);
  margin: 0;
}

.page-contact .band__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 34px;
  margin: 0;
  padding: 0;
}

.page-contact .band__list li {
  position: relative;
  font-size: 15px;
  color: var(--text-on-dark);
  padding-left: 16px;
}

.page-contact .band__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 2px;
  background: var(--cyan-signal);
}

/* ---------- 合作方式 ---------- */

.coop-list {
  list-style: none;
  margin: clamp(36px, 6vw, 68px) 0 0;
  padding: 0;
}

.coop-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding: clamp(26px, 4vw, 42px) 0;
  border-top: 1px solid var(--line-graphite);
}

.coop-item:last-child {
  border-bottom: 1px solid var(--line-graphite);
}

@media (min-width: 860px) {
  .coop-item {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: clamp(22px, 4vw, 52px);
  }
}

.coop-item__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--cyan-signal);
  margin: 6px 0 0;
}

.coop-item__title {
  font-family: var(--font-head);
  font-size: clamp(21px, 2.4vw, 32px);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0 0 10px;
}

.coop-item__lead {
  font-size: 15.5px;
  line-height: 1.6;
  color: var(--paper-mute);
  margin: 0;
  max-width: 62ch;
}

.coop-more {
  margin-top: 18px;
}

.coop-more__summary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  border: 2px solid var(--line-graphite);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--cyan-signal);
  cursor: pointer;
  list-style: none;
  background: transparent;
}

.coop-more__summary::-webkit-details-marker {
  display: none;
}

.coop-more__summary::after {
  content: "＋";
  font-size: 14px;
  color: var(--signal-orange);
}

.coop-more[open] > .coop-more__summary::after {
  content: "－";
}

.coop-more__summary:hover {
  border-color: var(--cyan-deep);
}

.coop-more__summary:focus-visible {
  outline: 2px solid var(--signal-orange);
  outline-offset: 2px;
}

.coop-meta {
  margin: 20px 0 0;
  display: grid;
  gap: 14px;
  padding-left: 2px;
  border-left: 1px solid var(--line-graphite);
}

.coop-meta__row {
  display: grid;
  gap: 4px;
  padding-left: 16px;
}

@media (min-width: 700px) {
  .coop-meta__row {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 20px;
  }
}

.coop-meta dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan-deep);
}

.coop-meta dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--text-on-dark);
}

/* ---------- 对接流程 ---------- */

.flow-list {
  list-style: none;
  margin: clamp(36px, 6vw, 64px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

@media (min-width: 900px) {
  .flow-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    column-gap: clamp(20px, 3vw, 40px);
  }
}

.flow-step {
  position: relative;
  padding: 28px 0 32px;
  border-top: 2px solid var(--line-graphite);
}

.flow-step::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  width: 36px;
  height: 2px;
  background: var(--signal-orange);
}

.flow-step__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan-deep);
  margin-bottom: 12px;
}

.flow-step__title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 10px;
}

.flow-step__text {
  font-size: 14.5px;
  line-height: 1.62;
  color: var(--paper-mute);
  margin: 0 0 14px;
}

.flow-step__time {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--amber-tick);
}

/* ---------- 协作案例 ---------- */

.contact-cases__grid {
  margin-top: clamp(36px, 6vw, 64px);
  gap: clamp(28px, 4vw, 48px);
}

.case-card {
  border-left: 3px solid var(--cyan-deep);
  padding: 4px 0 4px 22px;
  background: transparent;
}

.case-card__kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan-signal);
  margin: 0;
}

.case-card__title {
  font-size: 19px;
  font-weight: 700;
  line-height: 1.35;
  margin: 10px 0 12px;
}

.case-card__text {
  font-size: 14.5px;
  line-height: 1.68;
  color: var(--paper-mute);
  margin: 0;
}

.contact-cases__more {
  margin: clamp(32px, 5vw, 52px) 0 0;
  padding-top: 24px;
  border-top: 1px solid var(--line-graphite);
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--paper-mute);
  max-width: 76ch;
}

.contact-cases__more a {
  color: var(--cyan-signal);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-deep);
}

.contact-cases__more a:hover,
.contact-cases__more a:focus-visible {
  border-bottom-color: var(--signal-orange);
  outline: none;
}

/* ---------- 联系台面 ---------- */

.contact-desk__grid {
  display: grid;
  gap: clamp(36px, 6vw, 72px);
  align-items: start;
}

@media (min-width: 980px) {
  .contact-desk__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(40px, 6vw, 88px);
    align-items: start;
  }
}

.contact-desk__title {
  font-family: var(--font-head);
  font-size: clamp(28px, 3.6vw, 46px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.12;
  margin: 12px 0 18px;
}

.contact-desk__text {
  font-size: 15.5px;
  line-height: 1.68;
  color: var(--paper-mute);
  margin: 0;
  max-width: 46ch;
}

.contact-desk__paper {
  margin: clamp(28px, 4vw, 40px) 0 0;
  max-width: 380px;
}

/* 三层联系信息卡 */

.stack {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding-right: calc(var(--c-shift) * 2 + 2px);
}

.stack__card {
  position: relative;
  border: 2px solid var(--text-on-paper);
  border-radius: var(--radius);
  background: var(--paper-light);
  color: var(--text-on-paper);
  padding: 24px 24px 28px;
  box-shadow: 7px 7px 0 rgba(6, 21, 18, 0.5);
}

.stack__card:nth-child(1) {
  z-index: 4;
  width: 100%;
}

.stack__card:nth-child(2) {
  z-index: 3;
  width: calc(100% - var(--c-shift));
  margin-left: var(--c-shift);
  margin-top: -10px;
}

.stack__card:nth-child(3) {
  z-index: 2;
  width: calc(100% - var(--c-shift) * 2);
  margin-left: calc(var(--c-shift) * 2);
  margin-top: -10px;
}

.stack__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--pitch-layer);
  margin: 0;
}

.stack__value {
  font-size: clamp(15px, 2.6vw, 20px);
  line-height: 1.3;
  margin: 12px 0 14px;
  word-break: break-word;
}

.stack__phone {
  font-size: clamp(30px, 7.6vw, 96px);
  line-height: 1;
  letter-spacing: -0.035em;
  margin: 12px 0 0;
  white-space: nowrap;
}

.stack__underline {
  display: block;
  width: 76px;
  height: 4px;
  background: var(--signal-orange);
  margin: 16px 0 16px;
}

.stack__addr {
  font-size: clamp(15px, 2.2vw, 18px);
  line-height: 1.55;
  margin: 12px 0 12px;
  max-width: 30ch;
}

.stack__note {
  font-size: 13.5px;
  line-height: 1.62;
  color: rgba(10, 32, 27, 0.7);
  margin: 0;
  max-width: 46ch;
}

/* ---------- 来访与寄件 ---------- */

.contact-visit__grid {
  margin-top: clamp(34px, 5vw, 56px);
  gap: clamp(28px, 4vw, 52px);
}

.visit-box {
  padding-top: 22px;
  border-top: 1px solid var(--line-graphite);
}

.visit-box__title {
  font-size: 19px;
  font-weight: 700;
  margin: 0 0 16px;
}

.visit-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.visit-list li {
  position: relative;
  padding-left: 24px;
  font-size: 14.5px;
  line-height: 1.66;
  color: var(--paper-mute);
}

.visit-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 10px;
  height: 10px;
  border: 2px solid var(--cyan-deep);
  border-radius: 2px;
}

/* ---------- 常见疑问 ---------- */

.contact-faq__inner {
  max-width: 880px;
}

.faq-list {
  margin-top: clamp(32px, 5vw, 54px);
  border-top: 1px solid var(--line-graphite);
}

.faq-item {
  border-bottom: 1px solid var(--line-graphite);
}

.faq-item__q {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 22px 0;
  font-size: 17px;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
}

.faq-item__q::-webkit-details-marker {
  display: none;
}

.faq-item__q::before {
  content: "Q";
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--signal-orange);
  flex: none;
}

.faq-item__q:focus-visible {
  outline: 2px solid var(--signal-orange);
  outline-offset: 3px;
}

.faq-item__a {
  margin: 0;
  padding: 0 0 26px 30px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--paper-mute);
  max-width: 66ch;
}

.faq-item__a a {
  color: var(--cyan-signal);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-deep);
}

.faq-item__a a:hover,
.faq-item__a a:focus-visible {
  border-bottom-color: var(--signal-orange);
  outline: none;
}

/* ---------- 封口线 ---------- */

.page-contact .contact-seal {
  width: 52px;
  height: 2px;
  border: 0;
  background: var(--signal-orange);
  margin: 0 0 clamp(56px, 9vw, 104px);
}

@media (prefers-reduced-motion: reduce) {
  .page-contact * {
    animation: none !important;
    transition: none !important;
  }
}
<<<END>>>