.page-contact {
  background-color: var(--c-salt);
  color: var(--c-ink);
  overflow-x: hidden;
}

.page-contact .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--c-rock);
}

.page-contact .breadcrumbs a {
  color: var(--c-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--c-line);
}

.page-contact .breadcrumbs a:hover {
  border-bottom-color: var(--c-flag);
}

/* 首屏 */
.page-contact .contact-hero {
  padding: clamp(22px, 4vw, 44px) 0 clamp(34px, 5vw, 68px);
  border-bottom: 1px solid var(--c-line);
}

.page-contact .contact-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 44px);
  margin-top: clamp(20px, 3.5vw, 38px);
  align-items: end;
}

.page-contact .contact-hero__lead h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.6vw, 64px);
  line-height: 1.05;
  letter-spacing: -0.012em;
  margin: 12px 0 18px;
}

.page-contact .contact-hero__intro {
  max-width: 44ch;
  margin: 0;
  font-size: clamp(15px, 1.9vw, 17px);
  line-height: 1.75;
  color: var(--c-ink);
}

.page-contact .contact-hero__figure {
  margin: 0;
}

.page-contact .contact-hero__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--c-line);
}

/* 三条渠道 */
.page-contact .contact-channels {
  padding: clamp(36px, 6vw, 76px) 0 clamp(30px, 5vw, 60px);
}

.page-contact .contact-channels__head {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: clamp(20px, 3.5vw, 38px);
}

.page-contact .contact-channels__head h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.08;
  margin: 0;
}

.page-contact .contact-channels__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-contact .channel {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(20px, 3vw, 30px);
  transition: background-color var(--t) var(--ease), border-color var(--t) var(--ease);
}

.page-contact .channel::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background-color: transparent;
  transition: background-color var(--t) var(--ease);
}

.page-contact .channel:hover::before,
.page-contact .channel:focus-within::before {
  background-color: var(--c-flag);
}

.page-contact .channel--mail {
  background-color: var(--c-deep);
  color: var(--c-salt);
}

.page-contact .channel--phone {
  background-color: var(--c-lake);
  color: var(--c-salt);
}

.page-contact .channel--address {
  background-color: var(--c-paper);
  color: var(--c-ink);
  border: 1px solid var(--c-line);
}

.page-contact .channel__num {
  font-size: 12px;
  letter-spacing: 0.1em;
  opacity: 0.78;
}

.page-contact .channel__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 2.6vw, 26px);
  line-height: 1.15;
  margin: 0;
}

.page-contact .channel__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  opacity: 0.92;
}

.page-contact .channel__scene {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  opacity: 0.7;
  transition: opacity var(--t) var(--ease);
}

.page-contact .channel:hover .channel__scene,
.page-contact .channel:focus-within .channel__scene {
  opacity: 1;
}

.page-contact .channel__value {
  margin: 0;
  padding-top: 12px;
  font-size: clamp(15px, 2.3vw, 19px);
  line-height: 1.45;
  letter-spacing: 0.02em;
  word-break: break-all;
  border-top: 1px solid rgba(244, 247, 246, 0.3);
}

.page-contact .channel--address .channel__value {
  border-top-color: var(--c-line);
  color: var(--c-deep);
}

.page-contact .channel__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 4px;
}

.page-contact .copy-btn {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.07em;
  padding: 9px 14px;
  background-color: transparent;
  color: inherit;
  border: 1px solid currentColor;
  border-radius: 0;
  cursor: pointer;
  transition: background-color var(--t) var(--ease), color var(--t) var(--ease), border-color var(--t) var(--ease);
}

.page-contact .copy-btn:hover,
.page-contact .copy-btn:focus-visible {
  background-color: var(--c-flag);
  border-color: var(--c-flag);
  color: var(--c-salt);
}

.page-contact .channel__link {
  font-size: 13px;
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
}

.page-contact .channel__link:hover {
  color: var(--c-flag-soft);
}

.page-contact .channel--address .channel__link:hover {
  color: var(--c-flag);
}

/* 纠错与合作 */
.page-contact .contact-submit {
  padding: clamp(36px, 6vw, 76px) 0;
  background-color: var(--c-paper);
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
}

.page-contact .contact-submit__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4.5vw, 52px);
}

.page-contact .contact-submit__col h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 4.2vw, 38px);
  line-height: 1.1;
  margin: 12px 0 16px;
}

.page-contact .contact-submit__col h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2.6vw, 24px);
  line-height: 1.25;
  margin: 12px 0 14px;
}

.page-contact .contact-submit__col p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.75;
  max-width: 56ch;
}

.page-contact .submit-list {
  list-style: none;
  margin: 20px 0 18px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-contact .submit-list li {
  padding-left: 14px;
  border-left: 1px solid var(--c-deep);
  font-size: 15px;
  line-height: 1.7;
}

.page-contact .submit-list__key {
  display: block;
  font-size: 12px;
  letter-spacing: 0.07em;
  color: var(--c-deep);
  margin-bottom: 2px;
}

.page-contact .contact-submit__note {
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-rock);
}

.page-contact .coop-steps {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-contact .coop-steps li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 15px;
  line-height: 1.6;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--c-line);
}

.page-contact .coop-steps .mono {
  flex: none;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-flag);
}

.page-contact .contact-submit__action {
  margin: 0;
}

.page-contact .contact-submit__action .btn {
  border-radius: 0;
  text-decoration: none;
}

/* 回复节奏 */
.page-contact .contact-rhythm {
  padding: clamp(38px, 6vw, 82px) 0;
  background-color: var(--c-night);
  color: var(--c-salt);
}

.page-contact .contact-rhythm__figure {
  margin: 0 0 clamp(26px, 4vw, 44px);
}

.page-contact .contact-rhythm__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  opacity: 0.45;
  border: 1px solid rgba(191, 217, 222, 0.26);
}

.page-contact .contact-rhythm__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
}

.page-contact .contact-rhythm__lead h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 4.2vw, 40px);
  line-height: 1.08;
  margin: 12px 0 16px;
}

.page-contact .contact-rhythm__lead p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(244, 247, 246, 0.84);
  max-width: 52ch;
}

.page-contact .rhythm-list {
  margin: 0;
  display: grid;
}

.page-contact .rhythm-list > div {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 12px;
  padding: 14px 0;
  border-top: 1px solid rgba(191, 217, 222, 0.24);
}

.page-contact .rhythm-list > div:last-child {
  border-bottom: 1px solid rgba(191, 217, 222, 0.24);
}

.page-contact .rhythm-list dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-flag-soft);
  padding-top: 3px;
}

.page-contact .rhythm-list dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(244, 247, 246, 0.88);
}

/* 备案信息 */
.page-contact .contact-registry {
  padding: clamp(38px, 6vw, 82px) 0;
}

.page-contact .contact-registry h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 4vw, 36px);
  line-height: 1.1;
  margin: 12px 0 clamp(20px, 3vw, 30px);
}

.page-contact .registry-block {
  border: 1px solid var(--c-ink);
  padding: clamp(20px, 3.2vw, 34px);
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
  background-color: var(--c-salt);
}

.page-contact .registry-block__icp {
  margin: 0;
  font-size: clamp(18px, 3.6vw, 28px);
  letter-spacing: 0.16em;
  color: var(--c-deep);
  word-break: break-all;
}

.page-contact .registry-list {
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.page-contact .registry-list > div {
  display: grid;
  gap: 2px;
  padding: 11px 0;
  border-top: 1px solid var(--c-line);
}

.page-contact .registry-list dt {
  font-size: 12px;
  letter-spacing: 0.07em;
  color: var(--c-rock);
}

.page-contact .registry-list dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  word-break: break-all;
}

.page-contact .contact-registry__foot {
  margin: clamp(18px, 3vw, 26px) 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--c-rock);
  max-width: 68ch;
}

.page-contact .contact-registry__foot a {
  color: var(--c-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--c-line);
}

.page-contact .contact-registry__foot a:hover {
  border-bottom-color: var(--c-flag);
  color: var(--c-flag);
}

/* 中等宽度 */
@media (min-width: 720px) {
  .page-contact .contact-channels__grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-contact .channel--address {
    grid-column: 1 / -1;
  }

  .page-contact .registry-list {
    grid-template-columns: 1fr 1fr;
    column-gap: 28px;
  }
}

/* 桌面：错位三栏与两列信息 */
@media (min-width: 1000px) {
  .page-contact .contact-hero__grid {
    grid-template-columns: 1.12fr 0.88fr;
    align-items: end;
  }

  .page-contact .contact-channels__grid {
    grid-template-columns: 1.08fr 0.96fr 0.86fr;
    align-items: start;
    gap: 20px;
  }

  .page-contact .channel--address {
    grid-column: auto;
    margin-top: 56px;
  }

  .page-contact .channel--phone {
    margin-top: 26px;
  }

  .page-contact .contact-submit__grid {
    grid-template-columns: 1.3fr 0.7fr;
  }

  .page-contact .contact-submit__col--coop {
    padding-left: clamp(20px, 3vw, 36px);
    border-left: 1px solid var(--c-line);
  }

  .page-contact .contact-rhythm__grid {
    grid-template-columns: 1fr 1.05fr;
    gap: 56px;
  }
}