.page-contact {
  --pc-gap: clamp(14px, 2.2vw, 20px);
  --pc-pad-y: clamp(34px, 5.5vw, 72px);
  --pc-grid-line: rgba(30, 59, 52, 0.55);
}

/* ---------- 首屏 ---------- */
.page-contact .pc-hero {
  position: relative;
  overflow: hidden;
  padding-top: clamp(18px, 3vw, 30px);
  background:
    radial-gradient(120% 90% at 88% -10%, rgba(53, 242, 208, 0.12), transparent 62%),
    linear-gradient(180deg, var(--pitch-900) 0%, var(--ink-950) 100%);
  border-bottom: 1px solid var(--line-700);
}

.page-contact .pc-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--pc-grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--pc-grid-line) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.35;
  pointer-events: none;
}

.page-contact .pc-hero__inner {
  position: relative;
  z-index: 1;
  padding-bottom: clamp(20px, 3vw, 34px);
}

.page-contact .pc-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--step-32);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--paper-100);
  margin: 0.34em 0 0.36em;
  max-width: 20ch;
}

.page-contact .pc-hero__lead {
  max-width: 54ch;
  color: var(--muted-400);
  font-size: var(--step-16);
  line-height: 1.75;
  margin: 0;
}

.page-contact .pc-hero__media {
  margin: 0;
  border-top: 1px solid var(--line-700);
  position: relative;
}

.page-contact .pc-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06) brightness(0.86);
}

.page-contact .pc-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(4, 16, 13, 0.15), rgba(4, 16, 13, 0.72));
  pointer-events: none;
}

/* ---------- 章节标题 ---------- */
.page-contact .pc-head {
  display: grid;
  gap: 10px;
  padding-top: 16px;
  border-top: 1px solid var(--line-700);
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-contact .pc-head__num {
  font-family: var(--font-mono);
  font-size: var(--step-24);
  line-height: 1;
  letter-spacing: 0.08em;
  color: var(--cyan-400);
}

.page-contact .pc-head__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--step-24);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--paper-100);
  margin: 0;
}

.page-contact .pc-head__note {
  margin: 0;
  max-width: 56ch;
  font-size: var(--step-14);
  line-height: 1.75;
  color: var(--muted-400);
}

/* ---------- 01 联系方式 ---------- */
.page-contact .pc-channels {
  padding-block: var(--pc-pad-y);
  background: var(--ink-950);
}

.page-contact .pc-channels__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--pc-gap);
}

.page-contact .pc-channel {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--pitch-800);
  border: 1px solid var(--line-700);
  padding: clamp(18px, 2.4vw, 26px);
  transition: border-color 220ms var(--ease), background-color 220ms var(--ease);
}

.page-contact .pc-channel::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  height: 2px;
  width: 0;
  background: var(--cyan-400);
  transition: width 240ms var(--ease);
}

.page-contact .pc-channel:hover,
.page-contact .pc-channel:focus-within {
  border-color: rgba(53, 242, 208, 0.45);
}

.page-contact .pc-channel:hover::after,
.page-contact .pc-channel:focus-within::after {
  width: 100%;
}

.page-contact .pc-channel__num {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: var(--step-12);
  letter-spacing: 0.14em;
  color: var(--ink-950);
  background: var(--cyan-400);
  padding: 2px 8px;
}

.page-contact .pc-channel__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--step-24);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper-100);
  margin: 14px 0 10px;
}

.page-contact .pc-channel__value {
  margin: 0 0 12px;
  overflow-wrap: anywhere;
}

.page-contact .pc-channel__link {
  font-size: var(--step-16);
  color: var(--amber-500);
  text-decoration: none;
  border-bottom: 1px dashed rgba(255, 179, 71, 0.5);
  overflow-wrap: anywhere;
}

.page-contact .pc-channel__link:hover {
  color: var(--cyan-200);
  border-bottom-color: rgba(168, 255, 240, 0.6);
}

.page-contact .pc-channel__plain {
  font-family: var(--font-mono);
  font-size: var(--step-14);
  line-height: 1.7;
  color: var(--amber-500);
}

.page-contact .pc-channel__desc {
  margin: 0 0 16px;
  font-size: var(--step-14);
  line-height: 1.75;
  color: var(--muted-400);
}

.page-contact .pc-channel__meta {
  margin: auto 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-700);
  font-size: var(--step-12);
  letter-spacing: 0.06em;
  color: var(--cyan-200);
}

/* ---------- 02 反馈类型 ---------- */
.page-contact .pc-feedback {
  padding-block: var(--pc-pad-y);
  background: linear-gradient(180deg, var(--pitch-900), var(--ink-950));
  border-top: 1px solid var(--line-700);
}

.page-contact .pc-feedback__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 32px);
  align-items: start;
}

.page-contact .pc-quad {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--pc-gap);
}

.page-contact .pc-quad__cell {
  position: relative;
  padding: clamp(16px, 2.2vw, 22px);
  background: linear-gradient(180deg, rgba(18, 49, 42, 0.95), rgba(10, 31, 26, 0.95));
  border: 1px solid var(--line-700);
}

.page-contact .pc-quad__cell:nth-child(even) {
  border-left: 2px solid rgba(255, 179, 71, 0.55);
}

.page-contact .pc-quad__tag {
  position: absolute;
  top: 12px;
  right: 12px;
  font-family: var(--font-mono);
  font-size: var(--step-12);
  line-height: 1.5;
  letter-spacing: 0.1em;
  color: var(--amber-500);
  border: 1px solid rgba(255, 179, 71, 0.45);
  padding: 0 7px;
}

.page-contact .pc-quad__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--step-18);
  line-height: 1.3;
  color: var(--paper-100);
  margin: 0 0 8px;
  padding-right: 40px;
}

.page-contact .pc-quad__text {
  margin: 0 0 12px;
  font-size: var(--step-14);
  line-height: 1.75;
  color: var(--muted-400);
}

.page-contact .pc-quad__more {
  border-top: 1px dashed var(--line-700);
  padding-top: 10px;
}

.page-contact .pc-quad__more summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--step-12);
  letter-spacing: 0.08em;
  color: var(--cyan-400);
}

.page-contact .pc-quad__more summary::-webkit-details-marker {
  display: none;
}

.page-contact .pc-quad__more summary::before {
  content: "+";
  display: inline-block;
  width: 14px;
  text-align: center;
  color: var(--amber-500);
}

.page-contact .pc-quad__more[open] summary::before {
  content: "–";
}

.page-contact .pc-quad__more summary:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 3px;
}

.page-contact .pc-quad__more ul {
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
}

.page-contact .pc-quad__more li {
  position: relative;
  padding-left: 14px;
  margin-bottom: 6px;
  font-size: var(--step-12);
  line-height: 1.7;
  color: var(--muted-400);
}

.page-contact .pc-quad__more li::before {
  content: "›";
  position: absolute;
  left: 0;
  color: var(--cyan-400);
}

.page-contact .pc-feedback__media {
  margin: 0;
  border: 1px solid var(--line-700);
  overflow: hidden;
  background: var(--pitch-800);
}

.page-contact .pc-feedback__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 7;
  object-fit: cover;
  filter: saturate(0.85) brightness(0.9);
}

.page-contact .pc-feedback__caption {
  padding: 12px 14px;
  font-size: var(--step-12);
  line-height: 1.7;
  color: var(--muted-400);
  border-top: 1px solid var(--line-700);
}

/* ---------- 03 回复节奏 ---------- */
.page-contact .pc-hours {
  padding-block: var(--pc-pad-y);
  background: var(--ink-950);
}

.page-contact .pc-hours__panel {
  position: relative;
  padding: clamp(20px, 3vw, 34px);
  background: var(--pitch-900);
  border: 1px solid var(--line-700);
  box-shadow: inset 3px 0 0 0 var(--cyan-400);
}

.page-contact .pc-hours__panel .pc-head__title {
  margin: 12px 0 14px;
}

.page-contact .pc-hours__text {
  margin: 0;
  max-width: 58ch;
  font-size: var(--step-16);
  line-height: 1.8;
  color: var(--muted-400);
}

.page-contact .pc-hours__text b {
  color: var(--amber-500);
  font-weight: 700;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.page-contact .pc-hours__scale {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 22px 0 12px;
}

.page-contact .pc-hours__tick {
  font-size: var(--step-12);
  letter-spacing: 0.08em;
  color: var(--cyan-200);
}

.page-contact .pc-hours__track {
  flex: 1 1 auto;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan-400), var(--amber-500));
  position: relative;
}

.page-contact .pc-hours__track::after {
  content: "";
  position: absolute;
  inset: -7px 0 -7px 0;
  background-image: repeating-linear-gradient(90deg, rgba(143, 168, 160, 0.5) 0 1px, transparent 1px 26px);
  pointer-events: none;
}

.page-contact .pc-hours__note {
  margin: 0;
  max-width: 58ch;
  font-size: var(--step-14);
  line-height: 1.75;
  color: var(--muted-400);
}

/* ---------- 04 合作 ---------- */
.page-contact .pc-collab {
  padding-block: var(--pc-pad-y);
  background: var(--pitch-900);
  border-top: 1px solid var(--line-700);
  border-bottom: 1px solid var(--line-700);
}

.page-contact .pc-collab__body {
  max-width: 720px;
}

.page-contact .pc-collab__body p {
  margin: 0 0 1em;
  font-size: var(--step-16);
  line-height: 1.85;
  color: var(--paper-100);
}

.page-contact .pc-collab__body p:last-child {
  margin-bottom: 0;
}

.page-contact .pc-collab__body a,
.page-contact .pc-siteinfo__body a {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 208, 0.4);
}

.page-contact .pc-collab__body a:hover,
.page-contact .pc-siteinfo__body a:hover {
  color: var(--cyan-200);
  border-bottom-color: var(--cyan-200);
}

/* ---------- 05 站点信息 ---------- */
.page-contact .pc-siteinfo {
  padding-block: var(--pc-pad-y);
  background: var(--ink-950);
}

.page-contact .pc-siteinfo__body {
  max-width: 760px;
}

.page-contact .pc-siteinfo__body p {
  margin: 0 0 1em;
  font-size: var(--step-14);
  line-height: 1.85;
  color: var(--muted-400);
}

.page-contact .pc-siteinfo__list {
  margin: 24px 0 0;
  border-top: 1px solid var(--line-700);
}

.page-contact .pc-siteinfo__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-700);
}

.page-contact .pc-siteinfo__row dt {
  font-family: var(--font-mono);
  font-size: var(--step-12);
  letter-spacing: 0.08em;
  color: var(--cyan-200);
}

.page-contact .pc-siteinfo__row dd {
  margin: 0;
  font-size: var(--step-14);
  line-height: 1.7;
  color: var(--paper-100);
  overflow-wrap: anywhere;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-contact .pc-quad {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 760px) {
  .page-contact .pc-hero__title {
    font-size: var(--step-44);
  }

  .page-contact .pc-hero__media img {
    aspect-ratio: 21 / 8;
  }

  .page-contact .pc-head {
    grid-template-columns: 76px minmax(0, 1fr);
    column-gap: 22px;
    align-items: start;
  }

  .page-contact .pc-head__num {
    font-size: var(--step-44);
    padding-top: 4px;
  }

  .page-contact .pc-head__title {
    font-size: var(--step-32);
  }

  .page-contact .pc-head__note {
    grid-column: 2;
  }

  .page-contact .pc-siteinfo__row {
    grid-template-columns: 160px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }
}

@media (min-width: 820px) {
  .page-contact .pc-channels__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-contact .pc-channel:nth-child(2) {
    margin-top: 34px;
  }

  .page-contact .pc-channel:nth-child(3) {
    margin-top: 14px;
  }
}

@media (min-width: 940px) {
  .page-contact .pc-feedback__layout {
    grid-template-columns: 7fr 5fr;
  }

  .page-contact .pc-feedback__media {
    position: sticky;
    top: calc(var(--head-h) + 20px);
  }
}

@media (min-width: 1100px) {
  .page-contact .pc-hero__title {
    font-size: var(--step-64);
  }

  .page-contact .pc-hero__lead {
    font-size: var(--step-18);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .pc-channel,
  .page-contact .pc-channel::after {
    transition: none;
  }
}

已完成。