.page-contact {
  --contact-band-bg: linear-gradient(118deg, rgba(22, 33, 46, 0.96) 0%, rgba(34, 48, 63, 0.94) 58%, rgba(12, 44, 36, 0.96) 100%);
  --contact-rail: 3px;
}

/* ---------- 首屏：非对称分屏 ---------- */
.page-contact .contact-hero {
  padding-top: clamp(20px, 4vw, 40px);
  padding-bottom: clamp(24px, 4vw, 48px);
}

.page-contact .contact-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 56px);
  align-items: start;
}

.page-contact .contact-hero-lead .arena-lede {
  margin-top: 18px;
}

.page-contact .contact-hero-media {
  margin: 0;
  border-radius: var(--arena-radius-lg);
  border: 1px solid var(--arena-line);
  overflow: hidden;
}

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

/* ---------- 联系方式大号排版 ---------- */
.page-contact .contact-direct {
  display: grid;
  gap: clamp(20px, 3vw, 28px);
  margin-top: clamp(28px, 4vw, 44px);
}

.page-contact .contact-line {
  position: relative;
  padding-left: 18px;
  border-left: var(--contact-rail) solid var(--arena-line);
  transition: border-color 260ms var(--arena-ease);
}

.page-contact .contact-line--live {
  border-left-color: var(--arena-cyan);
}

.page-contact .contact-line-label {
  display: block;
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--arena-cyan);
}

.page-contact .contact-line-value {
  display: block;
  margin: 10px 0 0;
  font-family: var(--arena-mono);
  font-size: clamp(17px, 4.6vw, 30px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
  color: var(--arena-text);
  overflow-wrap: anywhere;
}

.page-contact .contact-line-note {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--arena-muted);
  max-width: 54ch;
}

.page-contact .contact-line-note a {
  color: var(--arena-cyan-soft);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

.page-contact .contact-line-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 14px;
}

.page-contact .contact-copy {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  border: 1px solid var(--arena-line);
  border-radius: 999px;
  background: var(--arena-panel);
  color: var(--arena-text);
  font: inherit;
  font-size: 14px;
  line-height: 1.2;
  cursor: pointer;
  transition: border-color 220ms var(--arena-ease), background-color 220ms var(--arena-ease);
}

.page-contact .contact-copy:hover {
  border-color: var(--arena-cyan);
}

.page-contact .contact-copy:focus-visible {
  outline: 2px solid var(--arena-cyan);
  outline-offset: 3px;
}

.page-contact .contact-copy .arena-copy-value {
  color: var(--arena-text);
}

.page-contact .contact-copy .arena-copy-hint {
  font-size: 12px;
  color: var(--arena-muted);
}

.page-contact .contact-copy[data-copied] {
  border-color: var(--arena-cyan);
  background-color: rgba(47, 243, 208, 0.1);
}

.page-contact .contact-copy[data-copied] .arena-copy-hint {
  color: var(--arena-cyan);
}

/* ---------- 渠道清单 ---------- */
.page-contact .contact-routes {
  padding-top: clamp(32px, 6vw, 72px);
}

.page-contact .contact-route-list {
  display: grid;
  gap: 14px;
  margin-top: clamp(28px, 4vw, 44px);
}

.page-contact .contact-route {
  background: var(--arena-panel);
  border: 1px solid var(--arena-line);
  border-radius: var(--arena-radius-sm);
  overflow: hidden;
}

.page-contact .contact-route summary {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  padding: 18px 20px 18px 22px;
  cursor: pointer;
  list-style: none;
  transition: background-color 220ms var(--arena-ease);
}

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

.page-contact .contact-route summary::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 14px;
  width: var(--contact-rail);
  border-radius: 999px;
  background: var(--arena-line);
  transition: background-color 240ms var(--arena-ease);
}

.page-contact .contact-route summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--arena-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--arena-cyan);
}

.page-contact .contact-route[open] summary::before {
  background: var(--arena-cyan);
}

.page-contact .contact-route[open] summary::after {
  content: "\2013";
}

.page-contact .contact-route summary:hover {
  background-color: rgba(47, 243, 208, 0.05);
}

.page-contact .contact-route summary:focus-visible {
  outline: 2px solid var(--arena-cyan);
  outline-offset: -2px;
}

.page-contact .contact-route-name {
  font-size: clamp(16px, 2.4vw, 19px);
  font-weight: 600;
  color: var(--arena-text);
}

.page-contact .contact-route-body {
  padding: 0 20px 22px 22px;
  max-width: 66ch;
}

.page-contact .contact-route-body p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--arena-muted);
}

.page-contact .contact-route-body p:last-child {
  margin-bottom: 0;
}

.page-contact .contact-route-body a {
  color: var(--arena-cyan-soft);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

/* ---------- 合作与内容共建 ---------- */
.page-contact .contact-partner-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
  align-items: center;
}

.page-contact .contact-partner-copy .arena-prose {
  margin-top: 18px;
  color: var(--arena-muted);
}

.page-contact .contact-partner-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-contact .contact-partner-list li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--arena-muted);
}

.page-contact .contact-partner-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 10px;
  height: 2px;
  background: var(--arena-cyan);
}

.page-contact .contact-partner-note {
  margin: 22px 0 0;
  padding-left: 18px;
  border-left: var(--contact-rail) solid var(--arena-track);
  font-size: 15px;
  line-height: 1.75;
  color: var(--arena-text);
}

.page-contact .contact-partner-media {
  margin: 0;
  border-radius: var(--arena-radius-lg);
  border: 1px solid var(--arena-line);
  overflow: hidden;
}

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

/* ---------- 响应时效 ---------- */
.page-contact .contact-sla-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(26px, 4vw, 40px);
}

.page-contact .contact-sla-card {
  background: var(--arena-panel);
  border: 1px solid var(--arena-line);
  border-radius: var(--arena-radius-organic);
  padding: 22px 20px 24px;
}

.page-contact .contact-sla-figure {
  display: block;
  font-family: var(--arena-mono);
  font-size: clamp(28px, 5vw, 38px);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--arena-cyan);
}

.page-contact .contact-sla-card:nth-child(3) .contact-sla-figure {
  color: var(--arena-amber);
}

.page-contact .contact-sla-title {
  margin: 14px 0 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--arena-text);
}

.page-contact .contact-sla-text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--arena-muted);
}

/* ---------- 地址与备案色带 ---------- */
.page-contact .contact-band {
  background: var(--contact-band-bg);
  border: 1px solid var(--arena-line);
  border-radius: var(--arena-radius-lg);
  padding: clamp(26px, 5vw, 54px);
}

.page-contact .contact-band-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
}

.page-contact .contact-band-address {
  margin: 18px 0 0;
  font-family: var(--arena-mono);
  font-size: clamp(15px, 2.6vw, 19px);
  line-height: 1.6;
  letter-spacing: 0.01em;
  color: var(--arena-text);
}

.page-contact .contact-band-text {
  margin: 14px 0 0;
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.78;
  color: var(--arena-muted);
}

.page-contact .contact-band-text a {
  color: var(--arena-cyan-soft);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

.page-contact .contact-band-aside {
  padding-top: clamp(18px, 3vw, 26px);
  border-top: 1px solid var(--arena-line);
}

.page-contact .contact-band-label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--arena-amber);
}

.page-contact .contact-band-icp {
  margin: 12px 0 0;
  display: inline-block;
  padding: 6px 12px;
  border-radius: 8px;
  background: rgba(169, 255, 240, 0.12);
  font-family: var(--arena-mono);
  font-size: clamp(14px, 2.2vw, 17px);
  letter-spacing: 0.02em;
  color: var(--arena-cyan-soft);
}

.page-contact .contact-band-text--last {
  margin-top: 12px;
}

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-contact .contact-sla-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-contact .contact-sla-card:nth-child(1) {
    grid-column: span 5;
  }

  .page-contact .contact-sla-card:nth-child(2) {
    grid-column: span 4;
  }

  .page-contact .contact-sla-card:nth-child(3) {
    grid-column: span 3;
  }
}

@media (min-width: 920px) {
  .page-contact .contact-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(36px, 5vw, 72px);
  }

  .page-contact .contact-partner-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-contact .contact-band-grid {
    grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-contact .contact-band-aside {
    padding-top: 0;
    padding-left: clamp(24px, 3vw, 40px);
    border-top: 0;
    border-left: 1px solid var(--arena-line);
  }
}

@media (min-width: 1180px) {
  .page-contact .contact-route summary {
    padding-inline: 26px 24px;
  }

  .page-contact .contact-route-body {
    padding-inline: 26px 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .contact-route summary,
  .page-contact .contact-line,
  .page-contact .contact-copy {
    transition: none;
  }
}