.page-contact {
  --c-paper: #FBF7EE;
  --c-line: rgba(201, 164, 92, 0.5);
  --c-line-soft: rgba(27, 22, 19, 0.13);
  --c-shadow: 0 24px 42px -30px rgba(27, 22, 19, 0.58);
  padding-block: 4px 96px;
  background-image: radial-gradient(1100px 520px at 76% -8%, rgba(201, 164, 92, 0.16), transparent 62%);
}

/* ---------- 首屏 ---------- */
.page-contact .lede {
  position: relative;
  display: grid;
  gap: 26px;
  padding-block: 30px 42px;
  border-bottom: 1px solid var(--c-line-soft);
}

.page-contact .lede__title {
  margin: 14px 0 0;
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(34px, 6.4vw, 58px);
  line-height: 1.12;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.page-contact .lede__intro {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-contact .lede__note {
  display: none;
}

@media (min-width: 900px) {
  .page-contact .lede {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    align-items: end;
    padding-block: 42px 58px;
  }

  .page-contact .lede__note {
    display: block;
    justify-self: end;
    margin: 0;
    padding-right: 10px;
    border-right: 1px solid var(--c-line);
    writing-mode: vertical-rl;
    font-family: var(--mono);
    font-size: 13px;
    letter-spacing: 0.42em;
    color: var(--gold);
  }
}

/* ---------- 通道卡片 ---------- */
.page-contact .deck {
  padding-block: 56px 0;
}

.page-contact .deck__title {
  margin: 0 0 28px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.3;
  color: var(--ink);
}

.page-contact .deck__title::after {
  content: "";
  display: block;
  width: 68px;
  height: 2px;
  margin-top: 14px;
  background: linear-gradient(90deg, var(--red), var(--gold));
}

.page-contact .deck__grid {
  display: grid;
  gap: 20px;
}

.page-contact .chan {
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin: 0;
  padding: 28px 24px 30px;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: 2px;
  box-shadow: var(--c-shadow);
  transition: transform 0.22s var(--ease), border-color 0.22s var(--ease), box-shadow 0.22s var(--ease);
}

.page-contact .chan::before {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px solid rgba(201, 164, 92, 0.3);
  pointer-events: none;
}

.page-contact .chan::after {
  content: attr(data-idx);
  position: absolute;
  top: 16px;
  right: 18px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: rgba(110, 27, 35, 0.55);
}

.page-contact .chan:hover {
  transform: translateY(-3px);
  border-color: var(--gold);
}

.page-contact .chan > *:not(.chan__texture) {
  position: relative;
  z-index: 1;
}

.page-contact .chan__texture {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.12;
  pointer-events: none;
}

.page-contact .chan--mail {
  background: linear-gradient(158deg, #FCF8F0 0%, #F1E6D2 100%);
}

.page-contact .chan--addr {
  background: linear-gradient(158deg, #FBF7EE 0%, #F0E7D6 100%);
}

.page-contact .chan__key {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--red);
}

.page-contact .chan__key::before {
  content: "";
  width: 20px;
  height: 1px;
  background: var(--gold);
}

.page-contact .chan__val {
  margin: 0;
  font-family: var(--serif);
  font-weight: 700;
  color: var(--ink);
  word-break: break-word;
  overflow-wrap: anywhere;
}

.page-contact .chan__val--mail {
  font-size: clamp(20px, 3.4vw, 32px);
  line-height: 1.32;
}

.page-contact .chan__val--phone {
  font-size: clamp(30px, 6vw, 46px);
  line-height: 1.08;
  letter-spacing: 0.04em;
  color: var(--red);
  font-variant-numeric: tabular-nums;
}

.page-contact .chan__val--addr {
  font-size: clamp(17px, 2.1vw, 21px);
  font-weight: 600;
  line-height: 1.65;
}

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

.page-contact .chan__note {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

@media (min-width: 900px) {
  .page-contact .deck__grid {
    grid-template-columns: repeat(12, 1fr);
    gap: 24px;
  }

  .page-contact .chan--mail {
    grid-column: 1 / span 7;
    padding: 40px 36px 42px;
    gap: 20px;
  }

  .page-contact .chan--phone {
    grid-column: 8 / span 5;
  }

  .page-contact .chan--addr {
    grid-column: 3 / span 8;
  }
}

/* ---------- 折叠说明 ---------- */
.page-contact .briefs {
  padding-block: 68px 0;
}

.page-contact .briefs__title {
  margin: 0 0 22px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.3;
  color: var(--ink);
}

.page-contact .briefs__list {
  border-top: 1px solid var(--c-line-soft);
}

.page-contact .panel--contact {
  border-bottom: 1px solid var(--c-line-soft);
}

.page-contact .panel--contact .panel__summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px;
  padding: 20px 2px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.4;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

.page-contact .panel--contact .panel__summary::-webkit-details-marker {
  display: none;
}

.page-contact .panel--contact .panel__summary::after {
  content: "＋";
  flex: none;
  font-family: var(--mono);
  font-size: 15px;
  color: var(--gold);
}

.page-contact .panel--contact[open] .panel__summary::after {
  content: "－";
}

.page-contact .panel--contact .panel__body {
  max-width: 68ch;
  padding: 0 2px 24px;
  font-size: 15px;
  line-height: 1.88;
  color: var(--ink-soft);
}

.page-contact .panel--contact .panel__body p {
  margin: 0 0 14px;
}

.page-contact .panel--contact .panel__body p:last-child {
  margin-bottom: 0;
}

@media (min-width: 900px) {
  .page-contact .panel--contact .panel__summary {
    font-size: 20px;
    padding: 24px 2px;
  }
}

/* ---------- 写信前准备 ---------- */
.page-contact .prep {
  padding-block: 72px 0;
}

.page-contact .prep__grid {
  display: grid;
  gap: 32px;
}

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

.page-contact .prep__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: var(--paper-2);
  border: 1px solid var(--c-line);
  border-radius: 2px;
  box-shadow: var(--c-shadow);
}

.page-contact .prep__cap {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-contact .prep__title {
  margin: 0;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.3;
  color: var(--ink);
}

.page-contact .prep__lede {
  margin: 14px 0 0;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-contact .prep__list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-contact .prep__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding-top: 18px;
  border-top: 1px solid var(--c-line-soft);
}

.page-contact .prep__num {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--red);
  padding-top: 3px;
}

.page-contact .prep__text strong {
  display: block;
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-contact .prep__text p {
  margin: 7px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

@media (min-width: 900px) {
  .page-contact .prep__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 52px;
    align-items: start;
  }
}

/* ---------- 备案 ---------- */
.page-contact .filing {
  padding-block: 72px 0;
}

.page-contact .filing__card {
  position: relative;
  overflow: hidden;
  display: grid;
  gap: 24px;
  padding: 30px 26px;
  background: linear-gradient(140deg, #1F3A32 0%, #16302A 100%);
  border-radius: 2px;
  box-shadow: var(--c-shadow);
}

.page-contact .filing__key {
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--gold-2);
}

.page-contact .filing__val {
  margin: 12px 0 0;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(22px, 3.6vw, 34px);
  line-height: 1.2;
  letter-spacing: 0.02em;
  color: #F5EFE4;
}

.page-contact .filing__note {
  margin: 12px 0 0;
  max-width: 58ch;
  font-size: 13.5px;
  line-height: 1.78;
  color: rgba(245, 239, 228, 0.74);
}

.page-contact .filing__right {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.page-contact .copy-btn--invert {
  border-color: var(--gold);
  color: var(--gold-2);
  background: transparent;
}

.page-contact .copy-btn--invert:hover,
.page-contact .copy-btn--invert:focus-visible {
  background: rgba(201, 164, 92, 0.14);
  color: #F5EFE4;
}

.page-contact .copy-status--invert {
  color: var(--gold-2);
}

.page-contact .filing__seal {
  flex: none;
  width: 58px;
  height: 58px;
  display: grid;
  place-items: center;
  margin-left: auto;
  border: 1px solid var(--gold);
  border-radius: 2px;
  transform: rotate(-6deg);
  font-family: var(--serif);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--gold-2);
}

@media (min-width: 760px) {
  .page-contact .filing__card {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
    padding: 36px 40px;
  }
}

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

  .page-contact .chan:hover {
    transform: none;
  }
}