.page-contact {
  --c-spot: radial-gradient(58% 66% at 20% 16%, rgba(255, 106, 26, 0.20), transparent 62%),
            radial-gradient(50% 58% at 86% 28%, rgba(20, 224, 200, 0.15), transparent 60%);
  --c-card: rgba(27, 27, 71, 0.86);
  --c-card-line: rgba(169, 180, 207, 0.28);
  --c-hair: rgba(169, 180, 207, 0.18);
  --c-pad: clamp(22px, 3vw, 32px);
  background: var(--ink);
  color: var(--white);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-contact .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: clamp(18px, 3vw, 30px);
  font-size: 13px;
  color: var(--silver);
}

.page-contact .crumbs a {
  color: var(--silver);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 2px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

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

/* ---------- 首屏 ---------- */
.page-contact .contact-hero {
  position: relative;
  background: var(--ink-deep);
}

.page-contact .contact-hero__stage {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-height: clamp(540px, 76vh, 760px);
  padding-top: clamp(104px, 17vh, 184px);
  padding-bottom: clamp(132px, 15vw, 200px);
  overflow: hidden;
}

.page-contact .contact-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-contact .contact-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.6;
  filter: saturate(0.76) contrast(1.06);
}

.page-contact .contact-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 19, 48, 0.42) 0%, rgba(11, 19, 48, 0.8) 58%, var(--ink) 100%);
}

.page-contact .contact-hero__stage::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: var(--c-spot);
  pointer-events: none;
}

.page-contact .contact-hero__content {
  position: relative;
  z-index: 2;
  width: 100%;
}

.page-contact .contact-hero__grid {
  display: grid;
  gap: clamp(18px, 3vw, 40px);
}

.page-contact .contact-hero__title {
  margin: 16px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(38px, 8.4vw, 100px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-contact .contact-hero__lede {
  margin: 0;
  max-width: 46ch;
  color: rgba(255, 246, 234, 0.86);
}

.page-contact .contact-hero__meta {
  margin: 18px 0 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--cyan);
  overflow-wrap: anywhere;
}

/* ---------- 联络卡片 ---------- */
.page-contact .contact-cards {
  position: relative;
  z-index: 3;
  margin-top: clamp(-100px, -7vw, -56px);
  padding-bottom: clamp(48px, 7vw, 84px);
}

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

.page-contact .contact-card {
  position: relative;
  padding: var(--c-pad);
  background: var(--c-card);
  border: 1px solid var(--c-card-line);
  border-radius: var(--radius);
  backdrop-filter: blur(6px);
  transition: filter 0.25s var(--ease);
}

.page-contact .contact-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 56px;
  height: 3px;
  background: var(--orange);
}

.page-contact .contact-card:nth-child(2)::before { background: var(--cyan); }
.page-contact .contact-card:nth-child(3)::before { background: var(--gold); }

.page-contact .contact-card::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transform: translate(7px, 7px);
  pointer-events: none;
}

.page-contact .contact-card:hover {
  filter: brightness(1.06);
}

.page-contact .contact-card__value {
  display: block;
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(15px, 2.1vw, 19px);
  font-weight: 600;
  line-height: 1.5;
  color: var(--white);
  overflow-wrap: anywhere;
}

.page-contact .contact-card__note {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--silver);
}

/* ---------- 话题切换 ---------- */
.page-contact .contact-topics__head {
  max-width: 62ch;
}

.page-contact .contact-topics__head h2 {
  margin: 12px 0 16px;
}

.page-contact .topic-switch {
  position: relative;
  margin-top: clamp(28px, 4vw, 46px);
}

.page-contact .topic-input {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.page-contact .topic-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-contact .topic-tab {
  display: inline-flex;
  align-items: center;
  padding: 10px 18px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  color: var(--silver);
  cursor: pointer;
  user-select: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-contact .topic-tab:hover {
  color: var(--white);
  border-color: var(--cyan);
}

.page-contact #t-coop:checked ~ .topic-tabs [for="t-coop"],
.page-contact #t-sub:checked ~ .topic-tabs [for="t-sub"],
.page-contact #t-fix:checked ~ .topic-tabs [for="t-fix"],
.page-contact #t-other:checked ~ .topic-tabs [for="t-other"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-deep);
}

.page-contact .topic-input:focus-visible ~ .topic-tabs {
  outline: 2px solid rgba(20, 224, 200, 0.55);
  outline-offset: 6px;
  border-radius: 999px;
}

.page-contact .topic-panels {
  margin-top: clamp(24px, 3vw, 36px);
  padding-top: clamp(24px, 3vw, 36px);
  border-top: 1px solid var(--line);
}

.page-contact .topic-panel {
  display: none;
}

.page-contact #t-coop:checked ~ .topic-panels .topic-panel--coop,
.page-contact #t-sub:checked ~ .topic-panels .topic-panel--sub,
.page-contact #t-fix:checked ~ .topic-panels .topic-panel--fix,
.page-contact #t-other:checked ~ .topic-panels .topic-panel--other {
  display: block;
}

.page-contact .topic-panel__grid {
  display: grid;
  gap: clamp(24px, 3.4vw, 44px);
}

.page-contact .topic-panel__title {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 900;
  line-height: 1.24;
  color: var(--white);
}

.page-contact .topic-panel p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(255, 246, 234, 0.82);
}

.page-contact .topic-panel__aside {
  margin-top: 16px !important;
  font-size: 14px !important;
  color: var(--silver) !important;
}

.page-contact .topic-panel__aside a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(20, 224, 200, 0.45);
}

.page-contact .topic-panel__aside a:hover {
  border-color: var(--cyan);
}

.page-contact .topic-panel__label {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

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

.page-contact .material-list li {
  position: relative;
  padding: 0 0 12px 26px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--white);
  border-bottom: 1px solid var(--c-hair);
}

.page-contact .material-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 9px;
  height: 9px;
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
}

/* ---------- 写信之前 ---------- */
.page-contact .letter-grid {
  display: grid;
  gap: clamp(30px, 5vw, 56px);
}

.page-contact .letter-grid h2 {
  margin: 12px 0 16px;
}

.page-contact .letter-tips {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-contact .letter-tips li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(255, 246, 234, 0.82);
}

.page-contact .letter-tips li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  background: var(--orange);
}

.page-contact .letter-tips strong {
  color: var(--white);
  font-weight: 700;
}

.page-contact .letter-sheet {
  position: relative;
  padding: clamp(24px, 3.4vw, 40px);
  background: var(--paper);
  color: var(--black);
  border-radius: var(--radius);
  box-shadow: 9px 9px 0 rgba(255, 106, 26, 0.16);
}

.page-contact .letter-sheet__head {
  display: grid;
  gap: 5px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(20, 22, 31, 0.16);
}

.page-contact .letter-sheet__head + .letter-sheet__head {
  padding-top: 14px;
}

.page-contact .letter-sheet__label {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: rgba(20, 22, 31, 0.55);
}

.page-contact .letter-sheet__addr,
.page-contact .letter-sheet__subject {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  line-height: 1.6;
  color: var(--black);
  overflow-wrap: anywhere;
}

.page-contact .letter-sheet__fields {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
}

.page-contact .letter-sheet__fields li {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid rgba(20, 22, 31, 0.15);
  font-size: 14px;
  line-height: 1.6;
}

.page-contact .letter-sheet__fields span {
  color: rgba(20, 22, 31, 0.55);
}

.page-contact .letter-sheet__fields strong {
  font-weight: 500;
  color: var(--black);
  overflow-wrap: anywhere;
}

/* ---------- 数据合作 ---------- */
.page-contact .coop-grid {
  display: grid;
  gap: clamp(30px, 5vw, 60px);
}

.page-contact .coop-grid h2 {
  margin: 12px 0 16px;
}

.page-contact .coop-grid > div > p {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(255, 246, 234, 0.86);
}

.page-contact .coop-scope {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.page-contact .coop-chip {
  display: inline-flex;
  padding: 7px 14px;
  border: 1px solid rgba(255, 246, 234, 0.3);
  border-radius: 999px;
  font-size: 13px;
  color: rgba(255, 246, 234, 0.92);
}

.page-contact .coop-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 2.4vw, 26px);
}

.page-contact .coop-step {
  position: relative;
  padding-left: 66px;
  padding-bottom: 22px;
  border-bottom: 1px solid rgba(255, 246, 234, 0.18);
}

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

.page-contact .coop-step__num {
  position: absolute;
  left: 0;
  top: -4px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}

.page-contact .coop-step__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
}

.page-contact .coop-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(255, 246, 234, 0.78);
}

/* ---------- 到访与地址 ---------- */
.page-contact .visit-grid {
  display: grid;
  gap: clamp(30px, 5vw, 56px);
}

.page-contact .visit-grid h2 {
  margin: 12px 0 16px;
}

.page-contact .visit-address {
  margin-top: 24px;
  padding: 20px 24px;
  background: rgba(27, 27, 71, 0.66);
  border-left: 3px solid var(--orange);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-contact .visit-address__label {
  display: block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--silver);
}

.page-contact .visit-address__value {
  display: block;
  margin-top: 10px;
  font-family: var(--font-head);
  font-size: clamp(17px, 2.4vw, 22px);
  font-weight: 900;
  line-height: 1.42;
  color: var(--white);
}

.page-contact .visit-note {
  margin: 20px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--silver);
  overflow-wrap: anywhere;
}

.page-contact .visit-figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-deep);
}

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

.page-contact .visit-figure figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 30px 18px 16px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--white);
  background: linear-gradient(180deg, transparent, rgba(11, 19, 48, 0.92));
}

/* ---------- 常见问题 ---------- */
.page-contact .contact-faq h2 {
  margin: 12px 0 0;
}

.page-contact .faq-list {
  list-style: none;
  margin: clamp(24px, 3vw, 38px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-contact .faq-list li {
  border-bottom: 1px solid var(--line);
}

.page-contact .faq-list a {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: center;
  padding: clamp(18px, 2.4vw, 26px) 0;
  text-decoration: none;
  color: var(--white);
  transition: color 0.2s var(--ease);
}

.page-contact .faq-list a:hover,
.page-contact .faq-list a:focus-visible {
  color: var(--cyan);
}

.page-contact .faq-list__q {
  display: block;
  font-family: var(--font-head);
  font-size: clamp(16px, 2.1vw, 21px);
  font-weight: 700;
  line-height: 1.45;
}

.page-contact .faq-list__hint {
  display: block;
  margin-top: 7px;
  font-size: 13px;
  font-weight: 400;
  color: var(--silver);
}

.page-contact .faq-list__arrow {
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--orange);
}

.page-contact .back-to-top {
  margin: clamp(30px, 4vw, 46px) 0 0;
}

.page-contact .back-to-top a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding-bottom: 4px;
  font-size: 14px;
  color: var(--silver);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-contact .back-to-top a:hover,
.page-contact .back-to-top a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-contact .contact-cards__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-contact .contact-cards__grid .contact-card:last-child {
    grid-column: span 2;
  }
}

@media (min-width: 860px) {
  .page-contact .topic-panel__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr);
  }
}

@media (min-width: 900px) {
  .page-contact .contact-cards__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }

  .page-contact .contact-cards__grid .contact-card:last-child {
    grid-column: auto;
  }

  .page-contact .contact-card:nth-child(2) {
    transform: translateY(24px);
  }

  .page-contact .contact-card:nth-child(3) {
    transform: translateY(-6px);
  }

  .page-contact .visit-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
    align-items: center;
  }
}

@media (min-width: 960px) {
  .page-contact .contact-hero__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    align-items: end;
    gap: clamp(32px, 5vw, 76px);
  }

  .page-contact .letter-grid {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
    align-items: start;
    gap: clamp(40px, 6vw, 80px);
  }

  .page-contact .coop-grid {
    grid-template-columns: minmax(0, 0.72fr) minmax(0, 1.28fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .contact-card,
  .page-contact .topic-tab,
  .page-contact .faq-list a,
  .page-contact .back-to-top a,
  .page-contact .crumbs a {
    transition: none;
  }
}