.page-contact {
  --card-pad: clamp(18px, 2.6vw, 26px);
  --contact-rule: var(--rule);
}

/* ---------- 首屏 ---------- */
.page-contact .contact-hero {
  display: grid;
  gap: 36px;
  padding-block: clamp(24px, 4vw, 44px) clamp(36px, 5vw, 68px);
}

.page-contact .contact-hero__main {
  min-width: 0;
}

.page-contact .contact-hero__main h1 {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(32px, 5.4vw, 60px);
  line-height: 1.08;
  letter-spacing: -0.012em;
  color: var(--ink);
  margin: 16px 0 20px;
  max-width: 24ch;
}

.page-contact .contact-hero__main p {
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink);
  max-width: 52ch;
  margin: 0 0 28px;
}

.page-contact .contact-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-contact .contact-hero__card {
  display: grid;
  gap: 18px;
  min-width: 0;
}

.page-contact .contact-hero__card .media {
  border: 1px solid var(--rule-strong);
  box-shadow: var(--shadow-1);
}

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

.page-contact .contact-card {
  background: var(--paper-raise);
  border: 1px solid var(--rule-strong);
  box-shadow: var(--shadow-1);
  padding: var(--card-pad);
  display: grid;
  gap: 14px;
}

.page-contact .contact-card__row {
  display: grid;
  gap: 4px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--rule);
}

.page-contact .contact-card__row:last-of-type {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-contact .contact-card__key {
  font-family: var(--font-sans);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--moss);
}

.page-contact .contact-card__val {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 600;
  color: var(--clay);
  word-break: break-all;
}

.page-contact .contact-card__hint {
  font-size: 14px;
  line-height: 1.7;
  color: var(--moss);
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--rule);
}

/* ---------- 通用章节小引语 ---------- */
.page-contact .section__intro {
  font-size: 16px;
  line-height: 1.7;
  color: var(--moss);
  margin: 8px 0 0;
  max-width: 54ch;
}

.page-contact .chapter-mark--light .chapter-mark__num {
  color: var(--gold);
}

.page-contact .chapter-mark--light .chapter-mark__label {
  color: var(--paper);
}

.page-contact .chapter-mark--light .chapter-mark__line {
  background: var(--rule-light-strong);
}

/* ---------- 四类反馈 ---------- */
.page-contact .feedback-list {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  border-top: 1px solid var(--rule);
}

.page-contact .feedback-item {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 16px;
  padding: 24px 8px 24px 0;
  border-bottom: 1px solid var(--rule);
  transition: background var(--t) var(--ease), padding-left var(--t) var(--ease);
}

.page-contact .feedback-item:hover {
  background: var(--clay-soft);
  padding-left: 12px;
}

.page-contact .feedback-item__num {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  color: var(--gold);
  padding-top: 4px;
  letter-spacing: 0.02em;
}

.page-contact .feedback-item__body h3 {
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 700;
  color: var(--clay);
  margin: 0 0 8px;
  line-height: 1.3;
}

.page-contact .feedback-item__body p {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  max-width: 64ch;
}

/* ---------- 渠道选择 ---------- */
.page-contact .channel-grid {
  display: grid;
  gap: 22px;
  margin-top: 32px;
}

.page-contact .channel-card {
  background: var(--paper-raise);
  border: 1px solid var(--rule-strong);
  box-shadow: var(--shadow-1);
  padding: var(--card-pad);
  display: grid;
  gap: 12px;
  align-content: start;
  transition: transform var(--t) var(--ease), border-color var(--t) var(--ease);
}

.page-contact .channel-card:hover {
  transform: translateY(-2px);
  border-color: var(--clay);
}

.page-contact .channel-card h3 {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
  margin: 0;
  line-height: 1.35;
}

.page-contact .channel-card p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--ink);
}

.page-contact .channel-card__value {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 600;
  color: var(--clay);
  word-break: break-all;
  padding: 10px 0 2px;
  border-top: 1px dashed var(--rule);
}

.page-contact .channel-card__note {
  font-size: 13.5px;
  color: var(--moss);
}

.page-contact .channel-card--pine {
  background: var(--pine);
  border-color: var(--pine);
  color: var(--paper);
}

.page-contact .channel-card--pine h3,
.page-contact .channel-card--pine p {
  color: var(--paper);
}

.page-contact .channel-card--pine .channel-card__value {
  color: var(--gold);
  border-top-color: var(--rule-light-strong);
}

.page-contact .channel-card--pine .channel-card__note {
  color: var(--rule-light-strong);
}

.page-contact .channel-card--pine:hover {
  border-color: var(--gold);
}

/* ---------- 提交要素 ---------- */
.page-contact .submit-split {
  margin-top: 8px;
}

.page-contact .submit-split__lead h2 {
  font-family: var(--font-serif);
  font-size: clamp(26px, 3.2vw, 34px);
  font-weight: 900;
  line-height: 1.15;
  color: var(--ink);
  margin: 0 0 16px;
}

.page-contact .submit-split__lead p {
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  margin: 0 0 12px;
  max-width: 46ch;
}

.page-contact .submit-split__tip {
  font-size: 14px;
  color: var(--moss);
  border-left: 3px solid var(--gold);
  padding-left: 12px;
  margin-top: 20px !important;
}

.page-contact .checklist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-contact .checklist__item {
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 14px;
  padding: 16px 18px;
  background: var(--paper-raise);
  border: 1px solid var(--rule);
  box-shadow: var(--shadow-1);
  transition: border-color var(--t) var(--ease);
}

.page-contact .checklist__item:hover {
  border-color: var(--clay);
}

.page-contact .checklist__box {
  width: 20px;
  height: 20px;
  margin-top: 2px;
  border: 1.5px solid var(--clay);
  background: var(--clay-soft);
  position: relative;
  display: inline-block;
}

.page-contact .checklist__box::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 1px;
  width: 6px;
  height: 11px;
  border-right: 2px solid var(--clay);
  border-bottom: 2px solid var(--clay);
  transform: rotate(42deg);
}

.page-contact .checklist__item strong {
  display: block;
  font-family: var(--font-sans);
  font-size: 15.5px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 4px;
}

.page-contact .checklist__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--moss);
}

/* ---------- 回复节奏 ---------- */
.page-contact .rhythm-bar {
  display: grid;
  gap: 0;
  margin: 32px 0 0;
  border: 1px solid var(--rule-strong);
  box-shadow: var(--shadow-1);
}

.page-contact .rhythm-bar__seg {
  display: grid;
  gap: 4px;
  padding: 18px 20px;
  border-bottom: 1px solid var(--rule);
  transition: padding-left var(--t) var(--ease);
}

.page-contact .rhythm-bar__seg:last-child {
  border-bottom: 0;
}

.page-contact .rhythm-bar__seg--pine {
  background: var(--pine);
  color: var(--paper);
  border-bottom-color: var(--rule-light);
}

.page-contact .rhythm-bar__seg--sand {
  background: var(--sand);
  color: var(--ink);
}

.page-contact .rhythm-bar__seg:hover {
  padding-left: 28px;
}

.page-contact .rhythm-bar__step {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0.85;
}

.page-contact .rhythm-bar__seg--sand .rhythm-bar__step {
  color: var(--clay);
}

.page-contact .rhythm-bar__seg--pine .rhythm-bar__step {
  color: var(--gold);
}

.page-contact .rhythm-bar__text {
  font-size: 16px;
  line-height: 1.6;
  font-weight: 500;
}

.page-contact .rhythm-note {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--moss);
  max-width: 60ch;
}

/* ---------- 协作共建 ---------- */
.page-contact .collab {
  display: grid;
  gap: 28px;
  margin-top: 28px;
}

.page-contact .collab__media {
  min-width: 0;
}

.page-contact .collab__media .media {
  border: 1px solid var(--rule-strong);
  box-shadow: var(--shadow-1);
}

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

.page-contact .collab__body h2 {
  font-family: var(--font-serif);
  font-size: clamp(24px, 2.9vw, 30px);
  font-weight: 900;
  line-height: 1.2;
  color: var(--ink);
  margin: 0 0 14px;
  max-width: 22ch;
}

.page-contact .collab__body > p {
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  margin: 0 0 20px;
  max-width: 60ch;
}

.page-contact .collab__grid {
  display: grid;
  gap: 16px;
  margin-bottom: 22px;
}

.page-contact .collab__card {
  background: var(--paper-raise);
  border: 1px solid var(--rule);
  padding: 16px 18px;
  border-left: 3px solid var(--clay);
}

.page-contact .collab__card h3 {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--clay);
  margin: 0 0 6px;
}

.page-contact .collab__card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ink);
}

.page-contact .collab__prepare {
  background: var(--clay-soft);
  border: 1px dashed var(--rule-strong);
  padding: 18px;
}

.page-contact .collab__prepare h3 {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 10px;
}

.page-contact .collab__prepare ul {
  list-style: none;
  margin: 0 0 12px;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-contact .collab__prepare li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ink);
}

.page-contact .collab__prepare li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 10px;
  height: 1.5px;
  background: var(--clay);
}

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

.page-contact .collab__mono {
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--sky);
  word-break: break-all;
}

/* ---------- 地址与备案 ---------- */
.page-contact .contact-block {
  display: grid;
  gap: 26px;
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--rule-light-strong);
}

.page-contact .contact-block__main h2 {
  font-family: var(--font-serif);
  font-size: clamp(24px, 2.9vw, 30px);
  font-weight: 900;
  color: var(--paper);
  margin: 0 0 12px;
  line-height: 1.25;
}

.page-contact .contact-block__main p {
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--rule-light-strong);
  margin: 0 0 16px;
  max-width: 52ch;
}

.page-contact .contact-block__addr {
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 700;
  color: var(--gold);
  line-height: 1.5;
  margin: 0 !important;
  padding: 12px 16px;
  border-left: 3px solid var(--gold);
  background: rgba(217, 164, 65, 0.08);
}

.page-contact .contact-block__meta {
  margin: 0;
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-contact .contact-block__row {
  display: grid;
  gap: 3px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--rule-light);
}

.page-contact .contact-block__row:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-contact .contact-block__row dt {
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--gold);
  font-family: var(--font-sans);
}

.page-contact .contact-block__row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--paper);
  word-break: break-all;
}

.page-contact .contact-block__foot {
  margin: 26px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--rule-light-strong);
}

.page-contact .contact-block__foot a {
  color: var(--gold);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--t) var(--ease);
}

.page-contact .contact-block__foot a:hover {
  color: var(--paper);
}

.page-contact .contact-block__foot a:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-contact .channel-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }

  .page-contact .collab__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-contact .rhythm-bar {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-contact .rhythm-bar__seg {
    border-bottom: 1px solid var(--rule);
  }

  .page-contact .rhythm-bar__seg:nth-child(2n) {
    border-right: 0;
  }

  .page-contact .rhythm-bar__seg:nth-child(-n + 2) {
    border-bottom-color: var(--rule);
  }

  .page-contact .rhythm-bar__seg:nth-child(n + 3) {
    border-bottom: 0;
  }
}

@media (min-width: 960px) {
  .page-contact .contact-hero {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: clamp(40px, 5vw, 72px);
    align-items: start;
  }

  .page-contact .contact-hero__card {
    margin-left: 48px;
    margin-top: 56px;
  }

  .page-contact .feedback-item {
    grid-template-columns: 64px 1fr;
    gap: 24px;
    padding: 28px 12px 28px 0;
  }

  .page-contact .feedback-item__num {
    font-size: 19px;
  }

  .page-contact .feedback-item__body h3 {
    font-size: 22px;
  }

  .page-contact .collab {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: clamp(32px, 4vw, 56px);
    align-items: start;
  }

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

  .page-contact .contact-block {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: clamp(36px, 5vw, 80px);
    align-items: start;
  }

  .page-contact .rhythm-bar {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-contact .rhythm-bar__seg {
    border-bottom: 0;
    border-right: 1px solid var(--rule);
  }

  .page-contact .rhythm-bar__seg:last-child {
    border-right: 0;
  }

  .page-contact .rhythm-bar__seg--pine {
    border-right-color: var(--rule-light);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .feedback-item,
  .page-contact .channel-card,
  .page-contact .checklist__item,
  .page-contact .rhythm-bar__seg,
  .page-contact .contact-block__foot a {
    transition: none;
  }

  .page-contact .feedback-item:hover,
  .page-contact .rhythm-bar__seg:hover {
    padding-left: revert;
  }

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