.page-contact {
  --contact-line: rgba(126, 154, 146, .28);
  --contact-line-soft: rgba(126, 154, 146, .14);
  --contact-gap: clamp(20px, 4vw, 44px);
  --contact-pad: clamp(18px, 4vw, 32px);
  padding-block: clamp(20px, 4vw, 44px) clamp(44px, 7vw, 96px);
}

.page-contact .contact-hero {
  position: relative;
  padding-block: clamp(16px, 3vw, 32px) clamp(28px, 5vw, 56px);
  border-bottom: 1px solid var(--contact-line);
}

.page-contact .contact-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: min(220px, 42%);
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), rgba(51, 241, 207, 0));
}

.page-contact .contact-hero h1 {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(28px, 6vw, 54px);
  line-height: 1.2;
  letter-spacing: .06em;
  margin: .35em 0 .5em;
  max-width: 18ch;
}

.page-contact .contact-hero__lead {
  max-width: 64ch;
  margin: 0 0 clamp(20px, 3vw, 30px);
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.9;
  color: rgba(245, 242, 234, .84);
}

.page-contact .contact-hero__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-contact .section {
  margin-block: clamp(36px, 6vw, 80px) 0;
}

.page-contact .section-head {
  margin-bottom: clamp(16px, 2.6vw, 26px);
}

.page-contact .section-head__index {
  color: var(--amber);
}

.page-contact .contact-copy {
  max-width: 68ch;
  margin: 0 0 12px;
  font-size: 15.5px;
  line-height: 1.9;
  color: rgba(245, 242, 234, .8);
}

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

/* 联络卡与主栏 */
.page-contact .contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--contact-gap);
}

.page-contact .contact-card {
  background: var(--paper);
  color: var(--carbon);
  padding: var(--contact-pad);
  border: 1px solid rgba(16, 18, 20, .18);
  border-radius: var(--radius);
  box-shadow: 5px 5px 0 rgba(51, 241, 207, .16), 10px 10px 0 rgba(51, 241, 207, .07);
}

.page-contact .contact-card__eyebrow {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: #3f5a52;
}

.page-contact .contact-card__title {
  margin: 0 0 18px;
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: .04em;
  color: var(--ink);
}

.page-contact .contact-card__list {
  margin: 0;
  display: grid;
  gap: 14px;
}

.page-contact .contact-card__row {
  border-top: 1px solid rgba(16, 18, 20, .16);
  padding-top: 12px;
}

.page-contact .contact-card__row dt {
  margin-bottom: 4px;
  font-size: 12px;
  letter-spacing: .14em;
  color: #44615a;
}

.page-contact .contact-card__row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  font-weight: 600;
  color: var(--carbon);
  word-break: break-word;
}

.page-contact .contact-scale {
  margin-top: 22px;
}

.page-contact .contact-scale__labels {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  letter-spacing: .1em;
  color: #44615a;
}

.page-contact .contact-scale__track {
  position: relative;
  height: 20px;
  margin-top: 6px;
  border-left: 1px solid rgba(16, 18, 20, .4);
  background-image: repeating-linear-gradient(90deg, rgba(16, 18, 20, .32) 0 1px, transparent 1px 11.111%);
}

.page-contact .contact-scale__span {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), rgba(51, 241, 207, .28));
}

.page-contact .contact-scale__cap {
  margin: 8px 0 0;
  font-size: 12px;
  letter-spacing: .1em;
  color: #44615a;
}

.page-contact .contact-card__note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid rgba(16, 18, 20, .16);
  font-size: 13.5px;
  line-height: 1.75;
  color: #2c453f;
}

/* 图像 */
.page-contact .contact-figure {
  margin: 0 0 clamp(20px, 3vw, 30px);
  border: 1px solid var(--contact-line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-2);
}

.page-contact .contact-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 9;
}

.page-contact .contact-figure--side {
  margin-bottom: 0;
}

.page-contact .contact-figure--side img {
  aspect-ratio: 3 / 2;
}

/* 三类来信 */
.page-contact .channel-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-contact .channel-item {
  padding: clamp(16px, 2.4vw, 24px) 0 clamp(16px, 2.4vw, 24px) clamp(14px, 2vw, 22px);
  border-left: 2px solid var(--contact-line);
}

.page-contact .channel-item__tag {
  display: inline-block;
  margin-bottom: 8px;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-contact .channel-item__tag--amber {
  color: var(--amber);
}

.page-contact .channel-item__tag--blue {
  color: var(--blue);
}

.page-contact .channel-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: clamp(17px, 2.1vw, 21px);
  font-weight: 800;
  letter-spacing: .04em;
  line-height: 1.45;
}

.page-contact .channel-item p {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(245, 242, 234, .78);
}

/* 清单 */
.page-contact .checklist-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--contact-gap);
}

.page-contact .check-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
}

.page-contact .check-list li {
  border-bottom: 1px solid var(--contact-line-soft);
}

.page-contact .check-list li:first-child {
  border-top: 1px solid var(--contact-line-soft);
}

.page-contact .check-list label {
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 14px;
  padding: 16px 0;
  cursor: pointer;
}

.page-contact .check-list input {
  appearance: none;
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  margin: 2px 0 0;
  border: 2px solid var(--mute);
  border-radius: 0;
  background: transparent;
  position: relative;
  cursor: pointer;
}

.page-contact .check-list input:checked {
  border-color: var(--cyan);
  background: var(--cyan);
}

.page-contact .check-list input:checked::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 1px;
  width: 6px;
  height: 11px;
  border-right: 2px solid var(--carbon);
  border-bottom: 2px solid var(--carbon);
  transform: rotate(40deg);
}

.page-contact .check-list input:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
}

.page-contact .check-list__text strong {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-heading);
  font-size: 15.5px;
  font-weight: 700;
  letter-spacing: .03em;
  color: var(--warm);
}

.page-contact .check-list__text span {
  display: block;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(245, 242, 234, .66);
}

/* 处理流程 */
.page-contact .contact-steps {
  list-style: none;
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--contact-line-soft);
  border: 1px solid var(--contact-line-soft);
}

.page-contact .contact-step {
  background: var(--ink-2);
  padding: clamp(18px, 3vw, 28px);
}

.page-contact .contact-step__num {
  display: block;
  margin-bottom: 10px;
  font-size: 13px;
  letter-spacing: .2em;
  color: var(--amber);
}

.page-contact .contact-step h3 {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: .04em;
}

.page-contact .contact-step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(245, 242, 234, .76);
}

/* 合作 */
.page-contact .coop-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--contact-gap);
  margin: clamp(18px, 3vw, 28px) 0 clamp(18px, 3vw, 26px);
}

.page-contact .coop-card {
  padding: clamp(18px, 3vw, 28px);
  border: 1px solid var(--contact-line);
  border-top: 2px solid var(--amber);
  border-radius: var(--radius);
  background: rgba(16, 56, 47, .5);
}

.page-contact .coop-card:nth-child(2) {
  border-top-color: var(--blue);
}

.page-contact .coop-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-heading);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: .05em;
}

.page-contact .coop-card p {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(245, 242, 234, .78);
}

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

.page-contact .coop-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(245, 242, 234, .7);
}

.page-contact .coop-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 9px;
  height: 1px;
  background: var(--cyan);
}

/* 意见反馈折叠 */
.page-contact .contact-feedback .fold {
  border-top: 1px solid var(--contact-line-soft);
}

.page-contact .contact-feedback .fold:last-of-type {
  border-bottom: 1px solid var(--contact-line-soft);
}

.page-contact .contact-feedback .fold summary {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .03em;
  line-height: 1.6;
}

.page-contact .contact-feedback .fold summary::-webkit-details-marker {
  display: none;
}

.page-contact .contact-feedback .fold summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-data);
  font-size: 18px;
  color: var(--cyan);
}

.page-contact .contact-feedback .fold[open] summary::after {
  content: "–";
}

.page-contact .fold__body p {
  max-width: 66ch;
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(245, 242, 234, .78);
}

/* 尾条 */
.page-contact .contact-tail {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: clamp(40px, 6vw, 84px);
  padding: clamp(22px, 4vw, 38px);
  border: 1px solid var(--contact-line);
  border-left: 3px solid var(--cyan);
  border-radius: var(--radius);
  background: rgba(16, 56, 47, .42);
}

.page-contact .contact-tail__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(245, 242, 234, .82);
}

.page-contact .contact-tail__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@media (min-width: 760px) {
  .page-contact .contact-steps {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 820px) {
  .page-contact .coop-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-contact .contact-tail {
    grid-template-columns: 1fr auto;
    align-items: center;
  }
}

@media (min-width: 900px) {
  .page-contact .checklist-layout {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-contact .contact-grid {
    grid-template-columns: minmax(260px, 3fr) 9fr;
    align-items: start;
  }

  .page-contact .contact-card {
    position: sticky;
    top: 108px;
  }
}
<<<END>>>