.page-contact {
  --ch-radius: 4px 30px 4px 30px;
  --ch-radius-sm: 3px 16px 3px 16px;
  --ch-card: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-contact .contact-hero {
  padding-top: clamp(20px, 4vw, 40px);
  padding-bottom: clamp(36px, 6vw, 72px);
}

.page-contact .contact-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 5vw, 56px);
  align-items: center;
}

.page-contact .contact-hero__text h1 {
  font-family: var(--font-head);
  font-size: clamp(38px, 8vw, 76px);
  line-height: 1.04;
  font-weight: 800;
  letter-spacing: .01em;
  color: var(--blue);
  margin: 10px 0 0;
  max-width: 16ch;
}

.page-contact .contact-hero__lead {
  font-size: clamp(16px, 2.1vw, 18px);
  line-height: 1.78;
  color: var(--blue-deep);
  max-width: 34em;
  margin: 20px 0 0;
}

.page-contact .contact-hero__quick {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-contact .contact-hero__quick li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  padding: 12px 16px;
  background: var(--steel);
  border-left: 4px solid var(--blue);
  border-radius: var(--ch-radius-sm);
}

.page-contact .contact-hero__ql {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--slate);
  text-transform: uppercase;
  flex: 0 0 auto;
}

.page-contact .contact-hero__qv {
  font-size: clamp(15px, 2.4vw, 18px);
  font-weight: 500;
  color: var(--blue);
  word-break: break-all;
}

.page-contact .contact-jump {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: 24px 0 0;
  padding: 0;
}

.page-contact .contact-jump a {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--slate);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 2px;
  transition: color .2s ease, border-color .2s ease;
}

.page-contact .contact-jump a:hover,
.page-contact .contact-jump a:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
}

.page-contact .contact-hero__media img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

/* ---------- 三条通道 ---------- */
.page-contact .contact-channels {
  padding-top: clamp(24px, 4vw, 48px);
  padding-bottom: clamp(40px, 6vw, 80px);
}

.page-contact .channel-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  margin-top: clamp(22px, 3vw, 38px);
}

.page-contact .channel {
  position: relative;
  padding: 28px 24px 26px;
  border-radius: var(--ch-radius);
  background: var(--ch-card);
  border: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: transform .28s ease, box-shadow .28s ease, border-color .28s ease;
}

.page-contact .channel__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--ch-radius-sm);
  color: var(--paper);
  background: var(--blue);
  flex: 0 0 auto;
}

.page-contact .channel__title {
  font-family: var(--font-head);
  font-size: clamp(24px, 3.4vw, 32px);
  line-height: 1.1;
  font-weight: 800;
  color: var(--blue);
  margin: 0;
}

.page-contact .channel__sub {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--blue-deep);
}

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

.page-contact .channel__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--slate);
}

.page-contact .channel__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 6px;
  height: 6px;
  background: var(--orange);
  border-radius: 1px;
}

.page-contact .channel__note {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--slate);
}

.page-contact .channel__link {
  margin: 0;
  font-size: 13.5px;
}

.page-contact .channel__link a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid var(--orange);
  padding-bottom: 1px;
}

.page-contact .channel__link a:hover,
.page-contact .channel__link a:focus-visible {
  color: var(--orange);
}

/* 使用咨询 */
.page-contact .channel--service {
  background: var(--steel);
  border-color: rgba(11, 27, 58, .16);
}

.page-contact .channel--service .channel__icon {
  background: var(--blue);
}

.page-contact .channel__contact {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px dashed var(--line);
  display: grid;
  gap: 8px;
}

.page-contact .channel__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 14px;
}

.page-contact .channel__k {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--slate);
}

.page-contact .channel__v {
  font-size: 14.5px;
  font-weight: 500;
  color: var(--blue);
  word-break: break-all;
}

/* 数据勘误 */
.page-contact .channel--fix {
  background: var(--paper);
  border-color: rgba(255, 90, 31, .34);
  border-top: 4px solid var(--orange);
}

.page-contact .channel--fix .channel__icon {
  background: var(--orange);
}

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

.page-contact .checklist__item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--blue-deep);
}

.page-contact .checklist__item input {
  appearance: none;
  -webkit-appearance: none;
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  margin: 2px 0 0;
  border: 1.5px solid var(--slate);
  border-radius: 3px;
  background: transparent;
  cursor: pointer;
  position: relative;
  transition: background-color .18s ease, border-color .18s ease;
}

.page-contact .checklist__item input:checked {
  background: var(--orange);
  border-color: var(--orange);
}

.page-contact .checklist__item input:checked::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 1px;
  width: 5px;
  height: 10px;
  border-right: 2px solid #fff;
  border-bottom: 2px solid #fff;
  transform: rotate(42deg);
}

.page-contact .checklist__item input:focus-visible {
  outline: 2px solid var(--violet);
  outline-offset: 2px;
}

.page-contact .checklist__item label {
  cursor: pointer;
}

/* 内容合作 */
.page-contact .channel--coop {
  padding: 0;
  background: linear-gradient(160deg, var(--panel-a), var(--panel-b));
  border-color: var(--line-dark);
  color: var(--paper);
  overflow: hidden;
}

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

.page-contact .channel__media img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  opacity: .88;
}

.page-contact .channel__body {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 22px 24px 26px;
}

.page-contact .channel--coop .channel__title {
  color: var(--paper);
}

.page-contact .channel--coop .channel__sub,
.page-contact .channel--coop .channel__note {
  color: var(--steel);
}

.page-contact .channel--coop .channel__list li {
  color: var(--steel);
}

.page-contact .channel--coop .channel__icon {
  background: rgba(217, 226, 240, .12);
  color: var(--paper);
  width: 38px;
  height: 38px;
}

/* ---------- 满宽主题带 ---------- */
.page-contact .rule-band {
  background: var(--blue);
  color: var(--paper);
  overflow: hidden;
}

.page-contact .rule-band__inner {
  padding: 18px 0;
}

.page-contact .rule-band__text {
  font-family: var(--font-mono);
  font-size: clamp(12px, 1.6vw, 14px);
  letter-spacing: .12em;
  color: rgba(244, 241, 234, .82);
}

/* ---------- 投稿与专栏 ---------- */
.page-contact .contact-submit {
  padding-top: clamp(40px, 6vw, 82px);
  padding-bottom: clamp(40px, 6vw, 82px);
}

.page-contact .submit-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 56px);
  align-items: start;
}

.page-contact .submit-intro__title {
  font-family: var(--font-head);
  font-size: clamp(30px, 5vw, 52px);
  line-height: 1.08;
  font-weight: 800;
  color: var(--blue);
  margin: 10px 0 0;
  max-width: 14ch;
}

.page-contact .submit-intro__lead {
  font-size: 16px;
  line-height: 1.78;
  color: var(--blue-deep);
  max-width: 34em;
  margin: 18px 0 0;
}

.page-contact .submit-intro__link {
  margin: 22px 0 0;
  font-size: 14px;
}

.page-contact .submit-intro__link a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid var(--orange);
  padding-bottom: 1px;
}

.page-contact .submit-intro__link a:hover,
.page-contact .submit-intro__link a:focus-visible {
  color: var(--orange);
}

.page-contact .submit-panel {
  background: var(--paper);
  border-radius: var(--ch-radius);
  border: 1px solid var(--line);
  padding: 26px 24px 24px;
  display: grid;
  gap: 0;
}

.page-contact .submit-panel__title {
  font-family: var(--font-head);
  font-size: clamp(20px, 2.6vw, 24px);
  font-weight: 800;
  color: var(--blue);
  margin: 0 0 18px;
}

.page-contact .submit-track {
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.page-contact .submit-track__name {
  font-size: 16px;
  font-weight: 700;
  color: var(--blue-deep);
  margin: 0;
}

.page-contact .submit-track__meta {
  margin: 6px 0 8px;
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--violet);
}

.page-contact .submit-track__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate);
}

.page-contact .submit-panel__foot {
  margin: 18px 0 0;
  padding-top: 16px;
  border-top: 2px solid var(--orange);
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--slate);
}

/* ---------- 寄送与回复信息带 ---------- */
.page-contact .contact-timing {
  padding-top: clamp(24px, 4vw, 48px);
  padding-bottom: clamp(44px, 7vw, 96px);
}

.page-contact .reply-belt {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  background: linear-gradient(150deg, var(--panel-a), var(--panel-b));
  border-radius: var(--ch-radius);
  overflow: hidden;
  color: var(--paper);
}

.page-contact .reply-belt__addr,
.page-contact .reply-belt__timeline {
  padding: clamp(26px, 4vw, 44px) clamp(22px, 3.4vw, 44px);
}

.page-contact .reply-belt__addr {
  border-bottom: 1px solid var(--line-dark);
}

.page-contact .reply-belt .kicker {
  color: var(--orange);
}

.page-contact .reply-belt__title {
  font-family: var(--font-head);
  font-size: clamp(24px, 3.6vw, 34px);
  line-height: 1.14;
  font-weight: 800;
  color: var(--paper);
  margin: 10px 0 0;
}

.page-contact .reply-belt__address {
  margin: 20px 0 0;
  font-style: normal;
  font-size: clamp(16px, 2.6vw, 21px);
  line-height: 1.6;
  font-weight: 500;
  color: var(--paper);
  letter-spacing: .04em;
  padding: 16px 18px;
  border: 1px dashed var(--line-darker);
  border-radius: var(--ch-radius-sm);
  background: rgba(217, 226, 240, .05);
}

.page-contact .reply-belt__note {
  margin: 16px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--steel);
  max-width: 40em;
}

.page-contact .timeline {
  list-style: none;
  margin: 22px 0 0;
  padding: 0 0 0 20px;
  position: relative;
  display: grid;
  gap: 18px;
}

.page-contact .timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(var(--violet), var(--orange));
}

.page-contact .timeline__item {
  position: relative;
  display: grid;
  gap: 4px;
}

.page-contact .timeline__item::before {
  content: "";
  position: absolute;
  left: -20px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 3px rgba(255, 90, 31, .2);
}

.page-contact .timeline__time {
  font-size: 13.5px;
  font-weight: 500;
  color: var(--orange);
  letter-spacing: .04em;
}

.page-contact .timeline__txt {
  font-size: 14px;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 收束色带 ---------- */
.page-contact .contact-close {
  background: linear-gradient(96deg, var(--orange), #ff7a3d 78%, #ff8a52);
  color: #fff;
}

.page-contact .contact-close__inner {
  padding: clamp(30px, 5vw, 52px) 0;
  display: grid;
  gap: 10px;
}

.page-contact .contact-close__title {
  font-family: var(--font-head);
  font-size: clamp(26px, 4.4vw, 40px);
  line-height: 1.1;
  font-weight: 800;
  margin: 0;
  color: #fff;
}

.page-contact .contact-close__meta {
  margin: 0;
  font-size: clamp(14px, 2.2vw, 17px);
  font-weight: 500;
  letter-spacing: .04em;
  color: rgba(255, 255, 255, .96);
  word-break: break-word;
}

.page-contact .contact-close__hint {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(255, 255, 255, .86);
}

/* ---------- 桌面栅格 ---------- */
@media (min-width: 780px) {
  .page-contact .contact-hero__quick {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-contact .contact-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-contact .contact-hero__grid {
    align-items: end;
  }

  .page-contact .contact-hero__media {
    margin-bottom: -8px;
  }
}

@media (min-width: 900px) {
  .page-contact .channel-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 26px;
    align-items: start;
  }

  .page-contact .channel--service {
    grid-column: 1 / span 4;
    margin-top: 0;
  }

  .page-contact .channel--fix {
    grid-column: 5 / span 4;
    margin-top: 40px;
  }

  .page-contact .channel--coop {
    grid-column: 9 / span 4;
    margin-top: 84px;
  }

  .page-contact .channel--fix:hover,
  .page-contact .channel--fix:focus-within {
    transform: translateY(-4px);
    box-shadow: 0 14px 30px rgba(11, 27, 58, .1);
    border-color: var(--orange);
  }

  .page-contact .channel--service:hover,
  .page-contact .channel--service:focus-within {
    transform: translateY(-4px);
    box-shadow: 0 14px 30px rgba(11, 27, 58, .09);
  }

  .page-contact .channel--coop:hover,
  .page-contact .channel--coop:focus-within {
    transform: translateY(-4px);
    box-shadow: 0 18px 34px rgba(7, 9, 13, .32);
  }

  .page-contact .submit-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .page-contact .reply-belt {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-contact .reply-belt__addr {
    border-bottom: 0;
    border-right: 1px solid var(--line-dark);
  }
}

/* ---------- 窄屏控溢出 ---------- */
@media (max-width: 480px) {
  .page-contact .channel {
    padding: 22px 18px 20px;
  }

  .page-contact .channel__row {
    justify-content: flex-start;
  }

  .page-contact .rule-band__text {
    letter-spacing: .06em;
  }
}

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

  .page-contact .channel--fix:hover,
  .page-contact .channel--service:hover,
  .page-contact .channel--coop:hover {
    transform: none;
  }
}