.page-contact {
  --contact-pad: clamp(20px, 3.2vw, 32px);
  background: var(--ink);
}

/* ---------- 首屏 ---------- */

.page-contact .contact-hero {
  position: relative;
  padding-block-start: calc(var(--header-h) + 40px);
  padding-block-end: 76px;
  overflow: hidden;
  border-bottom: 2px solid var(--line);
  background:
    radial-gradient(780px 400px at 88% -8%, rgba(108, 70, 168, .46), transparent 70%),
    radial-gradient(520px 320px at 2% 112%, rgba(47, 227, 168, .1), transparent 72%),
    linear-gradient(178deg, var(--ink) 0%, #0B1D17 58%, var(--ink) 100%);
}

.page-contact .contact-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(147, 168, 160, .075) 1px, transparent 1px),
    linear-gradient(90deg, rgba(147, 168, 160, .075) 1px, transparent 1px);
  background-size: 52px 52px;
  -webkit-mask-image: linear-gradient(180deg, transparent 0%, #000 42%, transparent 100%);
  mask-image: linear-gradient(180deg, transparent 0%, #000 42%, transparent 100%);
}

.page-contact .contact-hero .shell {
  position: relative;
  z-index: 1;
}

.page-contact .contact-hero__body {
  margin-block-start: 30px;
  max-width: 62ch;
}

.page-contact .contact-hero__title {
  margin: 14px 0 0;
  font-size: clamp(30px, 5vw, 54px);
  line-height: 1.08;
  letter-spacing: -.022em;
  font-weight: 900;
  color: var(--text);
}

.page-contact .contact-hero__lead {
  margin-block-start: 20px;
  max-width: 54ch;
}

.page-contact .contact-hero__quick {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-contact .contact-hero__quick a {
  display: inline-block;
  padding: 9px 15px;
  border: 2px solid var(--line);
  background: rgba(16, 27, 24, .72);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .02em;
  text-decoration: none;
  transition: border-color .2s var(--ease), color .2s var(--ease), transform .2s var(--ease);
}

.page-contact .contact-hero__quick a:hover,
.page-contact .contact-hero__quick a:focus-visible {
  color: var(--neon);
  border-color: var(--neon);
  transform: translateY(-2px);
}

/* ---------- 联络卡片拼贴 ---------- */

.page-contact .contact-cards-section {
  position: relative;
  z-index: 2;
  margin-block-start: -44px;
  padding-block-end: clamp(56px, 7vw, 92px);
}

.page-contact .contact-cards {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap);
}

.page-contact .contact-cards__bg {
  position: absolute;
  inset: -3% -2%;
  z-index: 0;
  pointer-events: none;
  opacity: .08;
  overflow: hidden;
}

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

.page-contact .contact-card {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: var(--contact-pad);
  overflow: hidden;
  background: var(--panel);
  isolation: isolate;
}

.page-contact .contact-card__title {
  margin: 0;
  font-size: clamp(21px, 2.6vw, 28px);
  line-height: 1.24;
  letter-spacing: -.014em;
  font-weight: 800;
  color: var(--text);
}

.page-contact .contact-card--mail .contact-card__title {
  font-size: clamp(24px, 3.3vw, 38px);
  line-height: 1.16;
}

.page-contact .contact-card__text {
  margin: 0;
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.75;
}

.page-contact .contact-mail {
  display: flex;
  flex-direction: column;
  gap: 7px;
  margin-block-start: auto;
  padding: 18px 20px;
  border: 2px solid var(--line);
  border-inline-start: 4px solid var(--neon);
  background: var(--panel-3);
}

.page-contact .contact-mail__label {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--muted);
}

.page-contact .contact-mail__addr {
  font-size: clamp(15px, 1.9vw, 21px);
  font-weight: 600;
  color: var(--neon);
  word-break: break-all;
}

.page-contact .contact-card__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.page-contact .contact-mail__note {
  font-size: 13px;
  color: var(--muted);
}

.page-contact .contact-card--phone {
  border-inline-start: 4px solid var(--amber);
}

.page-contact .contact-phone {
  margin: auto 0 0;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 38px);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  letter-spacing: .01em;
  color: var(--amber);
}

.page-contact .contact-card--address {
  background: var(--panel-3);
}

.page-contact .contact-card--address::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(185deg, rgba(16, 27, 24, .62) 0%, rgba(8, 21, 15, .93) 78%);
}

.page-contact .contact-card--address > *:not(.contact-card__bg) {
  position: relative;
  z-index: 2;
}

.page-contact .contact-card__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .3;
}

.page-contact .contact-address {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(16px, 2vw, 20px);
  line-height: 1.6;
  font-weight: 600;
  color: var(--text);
}

/* ---------- 合作与清单 ---------- */

.page-contact .contact-collab {
  padding-block: clamp(54px, 7vw, 90px);
  border-top: 2px solid var(--line);
  background: linear-gradient(180deg, var(--ink) 0%, #0A1A14 55%, var(--ink) 100%);
}

.page-contact .contact-collab__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 4.5vw, 52px);
}

.page-contact .contact-collab__title {
  margin: 14px 0 0;
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1.18;
  letter-spacing: -.018em;
  font-weight: 900;
  color: var(--text);
  max-width: 20ch;
}

.page-contact .contact-collab__text {
  margin: 18px 0 0;
  max-width: 52ch;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.78;
}

.page-contact .partner-list {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  border-top: 2px solid var(--line);
}

.page-contact .partner-list__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 18px;
  padding-block: 20px;
  border-bottom: 2px solid var(--line);
  transition: background-color .2s var(--ease);
}

.page-contact .partner-list__item:hover {
  background: rgba(47, 227, 168, .05);
}

.page-contact .partner-list__no {
  padding-block-start: 3px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--amber);
}

.page-contact .partner-list__title {
  margin: 0 0 6px;
  font-size: 18px;
  font-weight: 800;
  color: var(--text);
}

.page-contact .partner-list__text {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.72;
}

.page-contact .contact-collab__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-block-start: 30px;
}

.page-contact .contact-checklist {
  position: relative;
  padding: var(--contact-pad);
  border: 2px solid var(--line);
  border-top: 4px solid var(--neon);
  background: linear-gradient(180deg, rgba(23, 54, 44, .92) 0%, rgba(12, 31, 25, .96) 100%);
  box-shadow: var(--shadow);
}

.page-contact .contact-checklist__title {
  margin: 12px 0 0;
  font-size: clamp(21px, 2.6vw, 28px);
  line-height: 1.24;
  font-weight: 800;
  letter-spacing: -.014em;
  color: var(--text);
}

.page-contact .contact-checklist__text {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.72;
}

.page-contact .check-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
}

.page-contact .check-list__item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 13px 12px;
  border-bottom: 2px solid rgba(42, 74, 63, .85);
  cursor: pointer;
  transition: background-color .2s var(--ease), color .2s var(--ease);
}

.page-contact .check-list__item:hover {
  background: rgba(47, 227, 168, .07);
}

.page-contact .check-list__box {
  position: relative;
  flex: 0 0 auto;
  width: 20px;
  height: 20px;
  margin: 3px 0 0;
  padding: 0;
  -webkit-appearance: none;
  appearance: none;
  border: 2px solid var(--line);
  background: var(--panel-3);
  cursor: pointer;
  transition: border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-contact .check-list__box:checked {
  border-color: var(--neon);
  background: rgba(47, 227, 168, .18);
}

.page-contact .check-list__box:checked::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 0;
  width: 6px;
  height: 11px;
  border-right: 2px solid var(--neon);
  border-bottom: 2px solid var(--neon);
  transform: rotate(42deg);
}

.page-contact .check-list__box:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

.page-contact .check-list__text {
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
}

.page-contact .check-list__item:hover .check-list__text {
  color: var(--neon);
}

.page-contact .contact-checklist__foot {
  margin: 20px 0 0;
  padding-block-start: 16px;
  border-top: 2px dashed rgba(42, 74, 63, .9);
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.7;
}

/* ---------- 桌面栅格 ---------- */

@media (min-width: 900px) {
  .page-contact .contact-cards {
    grid-template-columns: repeat(12, 1fr);
    align-items: stretch;
  }

  .page-contact .contact-card--mail {
    grid-column: 1 / 8;
    grid-row: 1 / 3;
  }

  .page-contact .contact-card--phone {
    grid-column: 8 / 13;
    grid-row: 1 / 2;
  }

  .page-contact .contact-card--address {
    grid-column: 8 / 13;
    grid-row: 2 / 3;
    margin-block-start: 22px;
  }

  .page-contact .contact-collab__grid {
    grid-template-columns: 1.06fr .94fr;
    align-items: start;
  }

  .page-contact .contact-checklist {
    margin-block-start: 46px;
  }
}

@media (max-width: 640px) {
  .page-contact .contact-hero {
    padding-block-end: 64px;
  }

  .page-contact .contact-cards-section {
    margin-block-start: -34px;
  }

  .page-contact .contact-hero__quick a {
    font-size: 12px;
    padding: 8px 12px;
  }

  .page-contact .contact-card__actions {
    gap: 10px;
  }

  .page-contact .contact-collab__links .btn {
    flex: 1 1 auto;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .contact-hero__quick a,
  .page-contact .contact-card,
  .page-contact .check-list__item,
  .page-contact .check-list__box {
    transition: none;
  }

  .page-contact .contact-hero__quick a:hover,
  .page-contact .contact-hero__quick a:focus-visible {
    transform: none;
  }
}