.page-contact {
  --contact-card-bg: rgba(15, 36, 64, .82);
  --contact-rule: 3px;
  padding-bottom: clamp(72px, 9vw, 120px);
  color: var(--soft);
  font-family: var(--font-body);
}

/* ---------- 通用文本起手式 ---------- */
.page-contact .eyebrow {
  margin: 0;
  font-family: var(--font-num);
  font-size: var(--size-xs);
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--electric);
}

.page-contact .section-title {
  margin: .55em 0 0;
  font-family: var(--font-display);
  font-size: var(--size-lg);
  line-height: 1.06;
  letter-spacing: -.01em;
  color: var(--paper);
  max-width: 26ch;
}

.page-contact .lede {
  margin: 18px 0 0;
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--soft);
  max-width: 60ch;
}

.page-contact .prose {
  margin: 16px 0 0;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--ink);
  max-width: 58ch;
}

.page-contact .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: 26px 0 0;
  list-style: none;
  font-size: .78rem;
  letter-spacing: .08em;
}

.page-contact .breadcrumb li + li::before {
  content: "/";
  margin-right: 10px;
  color: var(--ink);
}

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

.page-contact .breadcrumb a:hover,
.page-contact .breadcrumb a:focus-visible {
  color: var(--electric);
  border-bottom-color: var(--electric);
}

.page-contact .breadcrumb [aria-current="page"] {
  color: var(--electric);
  font-family: var(--font-num);
}

/* ---------- 首屏：响应节奏 ---------- */
.page-contact .contact-hero {
  position: relative;
  margin-top: clamp(20px, 3vw, 34px);
  padding: clamp(28px, 4.4vw, 52px) clamp(22px, 3.4vw, 48px) clamp(34px, 4.6vw, 56px);
  background:
    linear-gradient(122deg, rgba(15, 36, 64, .96) 0%, rgba(10, 26, 47, .92) 56%, rgba(22, 50, 79, .88) 100%);
  border: 1px solid var(--line);
  border-left: var(--contact-rule) solid var(--electric);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%);
  overflow: hidden;
}

.page-contact .contact-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(143, 163, 184, .08) 0 1px,
    transparent 1px 104px
  );
}

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

.page-contact .contact-hero h1 {
  margin: clamp(14px, 2vw, 22px) 0 0;
  font-family: var(--font-display);
  font-size: var(--size-xl);
  line-height: .98;
  letter-spacing: -.02em;
  color: var(--paper);
  max-width: 24ch;
  overflow-wrap: break-word;
}

.page-contact .contact-clock {
  list-style: none;
  margin: clamp(28px, 3.8vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-contact .contact-clock li {
  display: grid;
  gap: 8px;
  padding: 18px 20px;
  background: rgba(10, 26, 47, .78);
}

.page-contact .contact-clock .num-lg {
  font-family: var(--font-num);
  font-size: clamp(1.35rem, 3.4vw, 1.75rem);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.01em;
  color: var(--amber);
  line-height: 1.1;
}

.page-contact .contact-clock .stat-label {
  font-size: .82rem;
  line-height: 1.65;
  color: var(--ink);
}

/* ---------- 主体双栏 ---------- */
.page-contact .contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(48px, 6vw, 76px);
  margin-top: clamp(56px, 7vw, 88px);
}

/* ---------- 左栏：联系通道 ---------- */
.page-contact .contact-photo {
  margin: 26px 0 0;
  border: 1px solid var(--line);
  background: linear-gradient(150deg, var(--slate), var(--night));
}

.page-contact .contact-photo img,
.page-contact .offline-photo img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.92);
  transition: transform 320ms var(--ease);
}

.page-contact .contact-photo:hover img,
.page-contact .offline-photo:hover img {
  transform: scale(1.03);
}

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

.page-contact .channel-card {
  position: relative;
  padding: 20px 22px 20px 24px;
  background: var(--contact-card-bg);
  border: 1px solid var(--line);
  transition: border-color var(--dur) var(--ease),
              background var(--dur) var(--ease),
              transform var(--dur) var(--ease);
}

.page-contact .channel-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--electric);
  transform: scaleY(.3);
  transform-origin: top;
  transition: transform var(--dur) var(--ease);
}

.page-contact .channel-card:hover,
.page-contact .channel-card:focus-within {
  border-color: var(--line-strong);
  background: rgba(22, 50, 79, .9);
}

.page-contact .channel-card:hover::before,
.page-contact .channel-card:focus-within::before {
  transform: scaleY(1);
}

.page-contact .channel-card--plain::before {
  background: var(--ink);
}

.page-contact .channel-key {
  display: block;
  font-family: var(--font-num);
  font-size: var(--size-xs);
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--electric);
}

.page-contact .channel-value {
  display: block;
  margin-top: 10px;
  font-family: var(--font-num);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
  user-select: all;
}

.page-contact .channel-note {
  margin: 12px 0 0;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--ink);
}

.page-contact .copy-btn {
  margin-top: 16px;
  padding: 8px 16px;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: .75rem;
  letter-spacing: .16em;
  cursor: pointer;
  transition: color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              background var(--dur) var(--ease);
}

.page-contact .copy-btn:hover,
.page-contact .copy-btn:focus-visible {
  border-color: var(--electric);
  color: var(--electric);
}

.page-contact .copy-btn[data-copied="true"] {
  border-color: var(--neon);
  color: var(--neon);
  background: rgba(124, 247, 122, .08);
}

/* ---------- 右栏：来信分类 ---------- */
.page-contact .issue-list {
  margin-top: 30px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-contact .issue-card {
  position: relative;
  padding: 26px 24px 24px;
  background: linear-gradient(158deg, rgba(22, 50, 79, .82), rgba(15, 36, 64, .56));
  border: 1px solid var(--line);
  border-top: 2px solid var(--amber);
  transition: border-color var(--dur) var(--ease),
              background var(--dur) var(--ease);
}

.page-contact .issue-card:hover {
  border-color: var(--line-strong);
  border-top-color: var(--amber);
  background: linear-gradient(158deg, rgba(22, 50, 79, .95), rgba(15, 36, 64, .7));
}

.page-contact .issue-num {
  display: block;
  font-family: var(--font-num);
  font-size: 1.5rem;
  font-variant-numeric: tabular-nums;
  color: var(--amber);
  line-height: 1;
}

.page-contact .issue-title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: 1.2rem;
  line-height: 1.35;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-contact .issue-desc {
  margin: 12px 0 0;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--soft);
}

.page-contact .issue-brief {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  font-size: .82rem;
  line-height: 1.7;
  color: var(--ink);
}

.page-contact .issue-brief-key {
  display: inline-block;
  margin-right: 8px;
  font-family: var(--font-num);
  font-size: var(--size-xs);
  letter-spacing: .16em;
  color: var(--electric);
}

.page-contact .issue-more {
  margin: 12px 0 0;
  font-size: .82rem;
  line-height: 1.7;
  color: var(--ink);
}

.page-contact .issue-more a,
.page-contact .flow-foot a,
.page-contact .meta-foot a {
  color: var(--electric);
  text-decoration: none;
  background-image: linear-gradient(currentColor, currentColor);
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 0 1px;
  transition: background-size var(--dur) var(--ease);
}

.page-contact .issue-more a:hover,
.page-contact .issue-more a:focus-visible,
.page-contact .flow-foot a:hover,
.page-contact .flow-foot a:focus-visible,
.page-contact .meta-foot a:hover,
.page-contact .meta-foot a:focus-visible {
  background-size: 100% 1px;
}

/* ---------- 处理流程 ---------- */
.page-contact .contact-flow {
  margin-top: var(--gap-block);
  padding-top: clamp(36px, 5vw, 60px);
  border-top: 1px solid var(--line);
}

.page-contact .flow-track {
  list-style: none;
  margin: 38px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-contact .flow-step {
  position: relative;
  padding: 28px 24px 24px;
  background: rgba(15, 36, 64, .74);
  border: 1px solid var(--line);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-contact .flow-step:hover,
.page-contact .flow-step:focus-within {
  border-color: var(--line-strong);
  background: rgba(22, 50, 79, .86);
}

.page-contact .flow-node {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--amber);
  color: var(--deep);
  font-family: var(--font-num);
  font-size: .95rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  transform: rotate(-3deg);
}

.page-contact .flow-title {
  margin: 18px 0 0;
  font-family: var(--font-display);
  font-size: 1.25rem;
  line-height: 1.2;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-contact .flow-desc {
  margin: 12px 0 0;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--soft);
}

.page-contact .flow-tip {
  margin: 0;
  max-height: 200px;
  padding-top: 0;
  font-size: .8rem;
  line-height: 1.7;
  color: var(--neon);
  transition: max-height var(--dur) var(--ease),
              opacity var(--dur) var(--ease),
              margin var(--dur) var(--ease);
}

.page-contact .flow-tip span {
  font-family: var(--font-num);
  letter-spacing: .16em;
  color: var(--ink);
  margin-right: 8px;
}

.page-contact .flow-foot {
  margin: 26px 0 0;
  font-size: .86rem;
  line-height: 1.75;
  color: var(--ink);
  max-width: 62ch;
}

/* ---------- 线下同好小组 ---------- */
.page-contact .contact-offline {
  margin-top: var(--gap-block);
}

.page-contact .offline-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(34px, 5vw, 54px);
  align-items: center;
}

.page-contact .offline-photo {
  margin: 0;
  border: 1px solid var(--line-strong);
  background: linear-gradient(160deg, var(--slate), var(--deep));
}

.page-contact .offline-photo .img-cap {
  display: block;
  padding: 12px 16px 14px;
  font-size: .76rem;
  letter-spacing: .1em;
  color: var(--ink);
  border-top: 1px solid var(--line);
}

.page-contact .offline-facts {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-contact .offline-facts li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 15px 4px 15px 0;
  background: var(--deep);
  font-size: .92rem;
  line-height: 1.7;
  color: var(--soft);
}

.page-contact .offline-facts .num {
  flex: 0 0 auto;
  min-width: 2.4ch;
  font-family: var(--font-num);
  font-size: 1.5rem;
  font-variant-numeric: tabular-nums;
  color: var(--electric);
  line-height: 1;
}

.page-contact .offline-note {
  margin: 24px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--amber);
  font-size: .92rem;
  line-height: 1.8;
  color: var(--soft);
  max-width: 56ch;
}

/* ---------- 站点信息 ---------- */
.page-contact .contact-meta {
  margin-top: var(--gap-block);
  padding-top: clamp(32px, 4.4vw, 52px);
  border-top: 1px solid var(--line);
}

.page-contact .meta-list {
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
}

.page-contact .meta-list > div {
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr);
  gap: 10px 22px;
  align-items: baseline;
  padding: 13px 0;
  border-bottom: 1px dashed var(--line);
}

.page-contact .meta-list dt {
  font-family: var(--font-num);
  font-size: var(--size-xs);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink);
  white-space: nowrap;
}

.page-contact .meta-list dd {
  margin: 0;
  font-family: var(--font-num);
  font-size: .92rem;
  line-height: 1.6;
  color: var(--soft);
  overflow-wrap: anywhere;
  user-select: all;
}

.page-contact .meta-foot {
  margin: 26px 0 0;
  font-size: .82rem;
  line-height: 1.75;
  color: var(--ink);
  max-width: 62ch;
}

/* ---------- 桌面与平板 ---------- */
@media (min-width: 700px) {
  .page-contact .contact-clock {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-contact .issue-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-contact .meta-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(28px, 5vw, 76px);
  }
}

@media (min-width: 860px) {
  .page-contact .flow-track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-contact .flow-step:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 50px;
    right: -16px;
    width: 16px;
    height: 1px;
    background: var(--line-strong);
  }
}

@media (min-width: 900px) {
  .page-contact .offline-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-contact .offline-photo {
    transform: rotate(1.8deg);
    box-shadow: -16px 16px 0 rgba(22, 50, 79, .68);
  }
}

@media (min-width: 960px) {
  .page-contact .contact-grid {
    grid-template-columns: minmax(0, 400px) minmax(0, 1fr);
    align-items: start;
  }

  .page-contact .contact-photo {
    transform: rotate(-1.2deg);
  }
}

@media (hover: hover) and (min-width: 860px) {
  .page-contact .flow-tip {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
  }

  .page-contact .flow-step:hover .flow-tip,
  .page-contact .flow-step:focus-within .flow-tip {
    max-height: 120px;
    margin-top: 14px;
    opacity: 1;
  }
}

/* ---------- 窄屏保护 ---------- */
@media (max-width: 480px) {
  .page-contact .contact-hero {
    clip-path: none;
  }

  .page-contact .issue-card:nth-child(even) {
    transform: none;
  }

  .page-contact .meta-list > div {
    grid-template-columns: 1fr;
    gap: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .contact-photo img,
  .page-contact .offline-photo img,
  .page-contact .channel-card,
  .page-contact .channel-card::before,
  .page-contact .issue-card,
  .page-contact .flow-step,
  .page-contact .flow-tip,
  .page-contact .copy-btn,
  .page-contact .issue-more a,
  .page-contact .flow-foot a,
  .page-contact .meta-foot a,
  .page-contact .breadcrumb a {
    transition: none;
  }

  .page-contact .contact-photo:hover img,
  .page-contact .offline-photo:hover img {
    transform: none;
  }
}