.page-contact {
  --contact-rail-w: 350px;
  --contact-gap: clamp(30px, 4.5vw, 64px);
  display: block;
  background: var(--ink-900);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-contact .contact-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--ink-900);
  border-bottom: 1px solid var(--line);
}

.page-contact .contact-hero__media {
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}

.page-contact .contact-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 38%;
  opacity: 0.42;
  filter: saturate(0.45) contrast(1.06) brightness(0.88);
}

.page-contact .contact-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(7, 16, 13, 0.5) 0%, rgba(7, 16, 13, 0.86) 56%, var(--ink-900) 100%),
    radial-gradient(110% 80% at 6% 100%, rgba(43, 232, 200, 0.16), transparent 62%),
    radial-gradient(90% 70% at 96% 0%, rgba(255, 122, 47, 0.14), transparent 60%);
}

.page-contact .contact-hero__inner {
  position: relative;
  padding-top: clamp(28px, 5.5vw, 58px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-contact .contact-hero .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(26px, 4.5vw, 48px);
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-contact .contact-hero .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 140ms var(--ease), border-color 140ms var(--ease);
}

.page-contact .contact-hero .breadcrumb a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-contact .contact-hero__kicker {
  margin: 0 0 16px;
  font-family: var(--font-numeric);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.24em;
  color: var(--cyan);
}

.page-contact .contact-hero__title {
  margin: 0;
  max-width: 860px;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(34px, 7.4vw, 76px);
  line-height: 1.02;
  letter-spacing: -0.008em;
  color: var(--paper);
}

.page-contact .contact-hero__lead {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 660px;
  font-family: var(--font-body);
  font-size: clamp(15px, 1.35vw, 17px);
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 主骨架 ---------- */
.page-contact .contact-main {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--contact-gap);
  padding-top: clamp(34px, 5vw, 68px);
  padding-bottom: clamp(58px, 8vw, 108px);
}

.page-contact .contact-flow {
  display: grid;
  gap: 0;
  min-width: 0;
}

/* ---------- 左侧联系轨道 ---------- */
.page-contact .contact-rail {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  min-width: 0;
  padding: 30px 24px 26px 30px;
  background: var(--ink-800);
  border: 1px solid var(--line);
}

.page-contact .contact-rail::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  z-index: 2;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--cyan-soft) 42%, var(--orange) 100%);
}

.page-contact .contact-rail__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}

.page-contact .contact-rail__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.2;
  filter: saturate(0.35);
}

.page-contact .contact-rail__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(12, 26, 22, 0.74), rgba(7, 16, 13, 0.94));
}

.page-contact .contact-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-heading);
  font-size: clamp(22px, 2.4vw, 28px);
  font-weight: 700;
  line-height: 1.25;
  color: var(--paper);
}

.page-contact .contact-rail__note {
  margin: 0 0 26px;
  font-size: 14px;
  line-height: 1.82;
  color: var(--muted);
}

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

.page-contact .channel {
  display: grid;
  gap: 9px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.page-contact .channel:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-contact .channel__key {
  font-family: var(--font-numeric);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.22em;
  color: var(--muted);
}

.page-contact .channel__value {
  display: block;
  word-break: break-word;
}

.page-contact .channel__value--mail {
  font-family: var(--font-numeric);
  font-weight: 500;
  font-size: clamp(17px, 1.9vw, 23px);
  line-height: 1.25;
  letter-spacing: -0.004em;
  color: var(--paper);
  padding-bottom: 7px;
  background-image: linear-gradient(90deg, var(--cyan), var(--cyan-soft));
  background-repeat: no-repeat;
  background-size: 100% 2px;
  background-position: 0 100%;
}

.page-contact .channel__value--tel {
  font-family: var(--font-numeric);
  font-weight: 500;
  font-size: clamp(26px, 4.6vw, 38px);
  line-height: 1.05;
  letter-spacing: 0.02em;
  color: var(--orange-soft);
  font-variant-numeric: tabular-nums;
}

.page-contact .channel__value--addr {
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--paper);
  padding: 10px 12px;
  border-left: 1px solid var(--line);
  background-image:
    repeating-linear-gradient(90deg, rgba(31, 58, 51, 0.5) 0 1px, transparent 1px 18px),
    repeating-linear-gradient(0deg, rgba(31, 58, 51, 0.5) 0 1px, transparent 1px 18px);
}

.page-contact .channel__hint {
  font-size: 13px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 内容区块 ---------- */
.page-contact .flow-section {
  padding-bottom: clamp(36px, 5vw, 58px);
  margin-bottom: clamp(36px, 5vw, 58px);
  border-bottom: 1px solid var(--line-soft);
}

.page-contact .flow-section:last-child {
  padding-bottom: 0;
  margin-bottom: 0;
  border-bottom: 0;
}

.page-contact .flow-head {
  display: flex;
  align-items: flex-start;
  gap: clamp(14px, 2.2vw, 26px);
  margin-bottom: clamp(22px, 3vw, 32px);
}

.page-contact .flow-head__idx {
  flex: 0 0 auto;
  font-family: var(--font-numeric);
  font-weight: 500;
  font-size: clamp(34px, 5.2vw, 58px);
  line-height: 0.9;
  color: var(--dim);
  font-variant-numeric: tabular-nums;
}

.page-contact .flow-head__text {
  min-width: 0;
}

.page-contact .flow-head .section-title {
  margin: 0 0 12px;
  font-family: var(--font-heading);
  font-size: clamp(23px, 3.1vw, 36px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--paper);
}

.page-contact .flow-head__intro {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.86;
  color: var(--muted);
}

.page-contact .contact-flow a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 232, 200, 0.36);
  transition: color 140ms var(--ease), border-color 140ms var(--ease);
}

.page-contact .contact-flow a:hover {
  color: var(--cyan-soft);
  border-bottom-color: var(--cyan-soft);
}

.page-contact .filter-bar {
  margin: 0 0 clamp(18px, 2.6vw, 28px);
}

/* ---------- 问题类型列表 ---------- */
.page-contact .topic-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-soft);
}

.page-contact .topic {
  display: grid;
  gap: 10px;
  padding: 20px 16px 20px 18px;
  border-bottom: 1px solid var(--line-soft);
  border-left: 3px solid transparent;
  transition: border-left-color 160ms var(--ease), background 160ms var(--ease);
}

.page-contact .topic:hover,
.page-contact .topic:focus-within {
  border-left-color: var(--cyan);
  background: linear-gradient(90deg, rgba(43, 232, 200, 0.07), rgba(43, 232, 200, 0) 74%);
}

.page-contact .topic__tag {
  justify-self: start;
  font-family: var(--font-numeric);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  padding: 3px 10px;
  color: var(--cyan);
  border: 1px solid currentColor;
}

.page-contact .topic__tag[data-tone="orange"] {
  color: var(--orange);
}

.page-contact .topic__title {
  margin: 0;
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.page-contact .topic__text {
  margin: 0;
  max-width: 66ch;
  font-size: 14.5px;
  line-height: 1.86;
  color: var(--muted);
}

.page-contact .topic__meta {
  margin: 0;
  font-family: var(--font-numeric);
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--orange-soft);
}

/* ---------- 回复时间线 ---------- */
.page-contact .reply-list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 22px;
  display: grid;
  gap: 0;
  border-left: 2px solid var(--line);
}

.page-contact .reply {
  position: relative;
  padding: 0 0 28px;
}

.page-contact .reply:last-child {
  padding-bottom: 0;
}

.page-contact .reply::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
}

.page-contact .reply:nth-child(2)::before {
  border-color: var(--orange);
}

.page-contact .reply:nth-child(3)::before {
  border-color: var(--dim);
}

.page-contact .reply__time {
  display: block;
  margin-bottom: 7px;
  font-family: var(--font-numeric);
  font-weight: 500;
  font-size: clamp(20px, 2.7vw, 30px);
  line-height: 1.1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-contact .reply__title {
  margin: 0 0 7px;
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.page-contact .reply__text {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.86;
  color: var(--muted);
}

/* ---------- 合作与选题 ---------- */
.page-contact .coop-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-contact .coop-item {
  display: grid;
  gap: 10px;
  padding: 22px 0;
  border-top: 1px solid var(--line-soft);
}

.page-contact .coop-item:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-contact .coop-item__label {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-body);
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-contact .coop-item__num {
  font-family: var(--font-numeric);
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--orange-soft);
  font-variant-numeric: tabular-nums;
}

.page-contact .coop-item__body {
  min-width: 0;
}

.page-contact .coop-item__title {
  margin: 0 0 8px;
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.page-contact .coop-item__text {
  margin: 0;
  max-width: 66ch;
  font-size: 14.5px;
  line-height: 1.88;
  color: var(--muted);
}

/* ---------- 站点信息 ---------- */
.page-contact .site-facts {
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-contact .site-facts__row {
  display: grid;
  gap: 8px;
  padding: 18px 20px;
  background: var(--ink-800);
}

.page-contact .site-facts dt {
  font-size: 12.5px;
  font-weight: 400;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-contact .site-facts dd {
  margin: 0;
  font-family: var(--font-numeric);
  font-weight: 500;
  font-size: clamp(17px, 1.9vw, 22px);
  line-height: 1.3;
  letter-spacing: 0.02em;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
  word-break: break-word;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-contact .coop-item {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 26px;
    align-items: start;
    padding: 24px 0;
  }

  .page-contact .coop-item__label {
    padding-top: 3px;
  }

  .page-contact .site-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .page-contact .contact-main {
    grid-template-columns: var(--contact-rail-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-contact .contact-rail {
    position: sticky;
    top: 26px;
    padding: 34px 28px 30px 34px;
  }
}

@media (min-width: 1280px) {
  .page-contact {
    --contact-rail-w: 378px;
  }
}

@media (max-width: 480px) {
  .page-contact .contact-rail {
    padding: 24px 18px 22px 22px;
  }

  .page-contact .topic {
    padding: 18px 12px 18px 14px;
  }

  .page-contact .reply-list {
    padding-left: 18px;
  }

  .page-contact .reply::before {
    left: -26px;
  }
}