.page-contact {
  --letter-rule: rgba(46, 70, 117, .16);
  --letter-edge: rgba(46, 70, 117, .3);
  --letter-tint: rgba(183, 138, 63, .06);
  padding-bottom: clamp(40px, 6vw, 88px);
  background-color: var(--paper);
  background-image: repeating-linear-gradient(135deg, var(--letter-tint) 0 1px, transparent 1px 10px);
  color: var(--ink);
  font-family: var(--sans);
}

.page-contact .breadcrumbs {
  padding-top: clamp(16px, 3vw, 28px);
}

/* ---------- 首屏 ---------- */
.page-contact .letter-hero {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  padding: clamp(22px, 4vw, 44px) 0 clamp(28px, 5vw, 56px);
  border-bottom: 1px solid var(--letter-edge);
}

.page-contact .letter-hero h1 {
  margin: 10px 0 0;
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(30px, 6.4vw, 58px);
  line-height: 1.2;
  letter-spacing: -.02em;
  color: var(--indigo);
}

.page-contact .letter-hero__lede {
  max-width: 34em;
  margin: 18px 0 0;
  font-size: 16px;
  line-height: 2;
  color: var(--ink);
}

.page-contact .letter-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 0;
}

.page-contact .letter-frame {
  padding: 9px;
  background: var(--paper-white);
  border: 1px solid var(--letter-edge);
  box-shadow: var(--shadow-sheet);
}

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

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

.page-contact .letter-hero__figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: .02em;
  color: var(--slate);
}

/* ---------- 主栅格 ---------- */
.page-contact .letter-grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  padding-top: clamp(26px, 4vw, 48px);
}

.page-contact .letter-aside__label {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cinnabar);
}

.page-contact .letter-aside__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-contact .letter-aside__list::-webkit-scrollbar {
  display: none;
}

.page-contact .letter-aside__list a {
  display: flex;
  flex: 0 0 auto;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--letter-edge);
  border-radius: 2px;
  background: var(--paper-white);
  color: var(--indigo);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
}

.page-contact .letter-aside__num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--cinnabar);
}

.page-contact .letter-aside__list a[aria-current="location"] {
  border-color: var(--cinnabar);
  color: var(--cinnabar);
  background: rgba(178, 58, 46, .06);
}

.page-contact .letter-seal {
  display: none;
  width: 66px;
  height: 66px;
  margin-top: 26px;
  place-items: center;
  border: 2px solid var(--cinnabar);
  border-radius: 2px;
  color: var(--cinnabar);
  font-family: var(--serif);
  font-size: 12px;
  line-height: 1.3;
  text-align: center;
  letter-spacing: .04em;
  opacity: .85;
  transform: rotate(-4deg);
}

/* ---------- 正文区块 ---------- */
.page-contact .letter-section {
  padding-block: clamp(24px, 4vw, 40px);
  border-top: 1px solid var(--letter-rule);
  scroll-margin-top: 96px;
}

.page-contact .letter-body > .letter-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-contact .letter-section__head {
  display: flex;
  gap: 14px;
  align-items: baseline;
  margin-bottom: 14px;
}

.page-contact .letter-section__num {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--cinnabar);
}

.page-contact .letter-section h2 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(21px, 3.2vw, 30px);
  line-height: 1.35;
  letter-spacing: -.01em;
  color: var(--indigo);
}

.page-contact .letter-section p {
  max-width: 34em;
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 2;
}

.page-contact .letter-section p a {
  color: var(--cinnabar);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-contact .letter-section p a:hover {
  color: var(--cinnabar-light);
}

/* ---------- 联络信息行 ---------- */
.page-contact .contact-line {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  margin: 18px 0;
  background: var(--paper-white);
  border: 1px solid var(--letter-edge);
  border-left: 3px solid var(--cinnabar);
  box-shadow: 0 1px 0 var(--paper-shade);
}

.page-contact .contact-line__label {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .16em;
  color: var(--slate);
}

.page-contact .contact-line__value {
  flex: 1 1 auto;
  min-width: 0;
  font-family: var(--mono);
  font-size: 15px;
  letter-spacing: .02em;
  color: var(--indigo);
  overflow-wrap: anywhere;
}

.page-contact .copy-tag {
  appearance: none;
  padding: 5px 10px;
  border: 1px solid var(--ochre);
  border-radius: 2px;
  background: rgba(183, 138, 63, .14);
  color: var(--indigo);
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: .08em;
  cursor: pointer;
  transition: background-color .2s var(--ease), color .2s var(--ease);
}

.page-contact .copy-tag:hover,
.page-contact .copy-tag:focus-visible {
  background: var(--ochre);
  color: var(--paper-white);
}

/* ---------- 地址与图 ---------- */
.page-contact .letter-address {
  display: grid;
  gap: 20px;
}

.page-contact .letter-address__figure {
  margin: 0;
}

/* ---------- 咨询类型与材料 ---------- */
.page-contact .material-list {
  display: grid;
  gap: 0;
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
}

.page-contact .material-item {
  padding: 16px 0 18px;
  border-bottom: 1px dashed rgba(46, 70, 117, .28);
}

.page-contact .material-item__title {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin: 0 0 10px;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 17px;
  line-height: 1.5;
  color: var(--indigo);
}

.page-contact .material-item ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-contact .material-item ul li {
  position: relative;
  padding-left: 15px;
  margin-bottom: 4px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
}

.page-contact .material-item ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .9em;
  width: 7px;
  height: 1px;
  background: var(--ochre);
}

/* ---------- 邮件标题模板 ---------- */
.page-contact .letter-template {
  margin-top: 22px;
  border: 1px solid var(--letter-edge);
  background: rgba(255, 255, 255, .55);
}

.page-contact .letter-template summary {
  padding: 12px 16px;
  color: var(--indigo);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: .04em;
  cursor: pointer;
  list-style: none;
}

.page-contact .letter-template summary::-webkit-details-marker {
  display: none;
}

.page-contact .letter-template summary::before {
  content: "＋";
  margin-right: 8px;
  font-family: var(--mono);
  color: var(--cinnabar);
}

.page-contact .letter-template[open] summary::before {
  content: "－";
}

.page-contact .letter-template__body {
  padding: 0 16px 16px;
  border-top: 1px solid var(--letter-rule);
}

.page-contact .letter-template__body p {
  margin: 10px 0 0;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.9;
  color: var(--indigo);
  overflow-wrap: anywhere;
}

.page-contact .letter-template__k {
  display: inline-block;
  margin-right: 8px;
  padding: 1px 6px;
  border: 1px solid rgba(183, 138, 63, .5);
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--ochre);
}

.page-contact .letter-template__body p.letter-template__note {
  margin-top: 16px;
  padding-top: 10px;
  border-top: 1px dashed rgba(46, 70, 117, .25);
  font-family: var(--sans);
  font-size: 13px;
  color: var(--slate);
}

/* ---------- 来信流程 ---------- */
.page-contact .letter-flow {
  display: grid;
  gap: 0;
  margin: 6px 0 18px;
  padding: 0;
  list-style: none;
}

.page-contact .letter-flow li {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 16px 0;
  border-top: 1px solid var(--letter-rule);
}

.page-contact .letter-flow__num {
  font-family: var(--mono);
  font-size: 22px;
  line-height: 1.1;
  color: var(--cinnabar);
}

.page-contact .letter-flow strong {
  display: block;
  margin-bottom: 4px;
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--indigo);
}

.page-contact .letter-flow p {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.9;
}

/* ---------- 备案信息 ---------- */
.page-contact .letter-record {
  position: relative;
  margin-top: clamp(30px, 5vw, 60px);
  padding: clamp(22px, 4vw, 34px);
  text-align: center;
  background: var(--paper-shade);
  border: 1px solid var(--indigo-mid);
}

.page-contact .letter-record::before {
  content: "";
  position: absolute;
  inset: 5px;
  border: 1px solid rgba(46, 70, 117, .35);
  pointer-events: none;
}

.page-contact .letter-record__seal {
  display: grid;
  width: 82px;
  height: 82px;
  margin: 0 auto 14px;
  place-items: center;
  border: 2px solid var(--cinnabar);
  border-radius: 50%;
  color: var(--cinnabar);
  font-family: var(--serif);
  font-size: 13px;
  line-height: 1.3;
  letter-spacing: .06em;
  opacity: .9;
  transform: rotate(-5deg);
}

.page-contact .letter-record p {
  margin: 6px 0;
  font-size: 13px;
  line-height: 1.9;
  color: var(--slate);
}

.page-contact .letter-record__icp {
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--indigo);
  border-bottom: 1px dashed var(--ochre);
  cursor: help;
}

.page-contact .letter-record__icp:hover {
  color: var(--cinnabar);
  border-bottom-color: var(--cinnabar);
}

.page-contact .letter-record p.letter-record__links {
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: .04em;
}

.page-contact .letter-record__links a {
  color: var(--indigo);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-contact .letter-record__links a:hover {
  color: var(--cinnabar);
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-contact .letter-hero {
    grid-template-columns: 7fr 5fr;
    align-items: end;
  }

  .page-contact .letter-grid {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
  }

  .page-contact .letter-aside {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-contact .letter-aside__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }

  .page-contact .letter-aside__list a {
    padding: 9px 0;
    border: 0;
    background: transparent;
    border-bottom: 1px solid transparent;
    font-size: 15px;
  }

  .page-contact .letter-aside__list a:hover {
    color: var(--cinnabar);
    border-bottom-color: var(--ochre);
  }

  .page-contact .letter-aside__list a[aria-current="location"] {
    background: transparent;
    border-bottom-color: var(--cinnabar);
  }

  .page-contact .letter-seal {
    display: grid;
  }

  .page-contact .material-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 4vw, 48px);
  }

  .page-contact .letter-address {
    grid-template-columns: minmax(0, 1fr) 250px;
    gap: 28px;
    align-items: start;
  }
}

@media (min-width: 1140px) {
  .page-contact .letter-address {
    grid-template-columns: minmax(0, 1fr) 300px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .copy-tag {
    transition: none;
  }
}