.page-contact {
  background:
    radial-gradient(120% 60% at 12% 0%, rgba(38, 247, 208, 0.08), transparent 60%),
    var(--bg-deep);
  color: var(--ink);
  padding-bottom: clamp(48px, 8vw, 96px);
}

/* ---------- 面包屑 ---------- */
.page-contact .arena-breadcrumb {
  padding-top: 20px;
  padding-bottom: 8px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
}
.page-contact .arena-breadcrumb a {
  color: var(--ink-muted);
  text-decoration: none;
}
.page-contact .arena-breadcrumb a:hover {
  color: var(--cyan);
}
.page-contact .arena-breadcrumb [aria-current="page"] {
  color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-contact .contact-hero {
  position: relative;
  padding-top: clamp(16px, 3vw, 32px);
  padding-bottom: clamp(28px, 4vw, 52px);
}
.page-contact .contact-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line), transparent);
}
.page-contact .contact-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
  align-items: center;
}
.page-contact .arena-kicker {
  margin: 0 0 12px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}
.page-contact .contact-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(40px, 8.5vw, 76px);
  line-height: 1.02;
  letter-spacing: 0.01em;
  color: var(--ink);
}
.page-contact .contact-hero h1::after {
  content: "";
  display: block;
  width: 72px;
  height: 3px;
  margin-top: 18px;
  background: var(--amber);
}
.page-contact .contact-hero__lead {
  margin: 0 0 24px;
  max-width: 46ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--ink);
}
.page-contact .contact-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-contact .contact-hero__meta {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-muted);
  max-width: 44ch;
}

.page-contact .contact-hero__art {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--bg-panel-2);
}
.page-contact .contact-hero__art::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    180deg,
    var(--scan) 0 1px,
    transparent 1px 5px
  );
  opacity: 0.5;
  pointer-events: none;
}
.page-contact .contact-hero__art img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-contact .contact-hero__art figcaption {
  padding: 10px 16px 14px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-muted);
  border-top: 1px solid var(--line-soft);
}

/* ---------- 主分栏 ---------- */
.page-contact .contact-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
  padding-top: clamp(32px, 5vw, 56px);
}

/* ---------- 左侧联系面板 ---------- */
.page-contact .contact-rail {
  position: relative;
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(170deg, var(--bg-panel) 0%, var(--bg-panel-2) 100%);
  overflow: hidden;
}
.page-contact .contact-rail::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    90deg,
    var(--scan) 0 1px,
    transparent 1px 7px
  );
  opacity: 0.28;
  pointer-events: none;
}
.page-contact .contact-rail__label {
  position: relative;
  margin: 0 0 6px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--amber);
}
.page-contact .contact-rail__title {
  position: relative;
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(22px, 3vw, 28px);
  line-height: 1.2;
  color: var(--ink);
}

.page-contact .contact-cards {
  position: relative;
  display: grid;
  gap: 12px;
}
.page-contact .contact-card {
  padding: 16px 18px;
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--teal);
  border-radius: var(--r-md);
  background: rgba(7, 21, 18, 0.55);
  transition: border-color var(--t) ease, transform var(--t) ease, background var(--t) ease;
}
.page-contact .contact-card:hover,
.page-contact .contact-card:focus-within {
  border-color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(13, 35, 30, 0.9);
  transform: translateX(2px);
}
.page-contact .contact-card__k {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-muted);
}
.page-contact .contact-card__v {
  display: block;
  font-family: var(--font-num);
  font-size: 15px;
  line-height: 1.5;
  color: var(--cyan);
  text-decoration: none;
  word-break: break-all;
}
.page-contact .contact-card__v--num {
  font-size: 20px;
  color: var(--amber);
  letter-spacing: 0.04em;
}
.page-contact .contact-card__v--text {
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--ink);
  line-height: 1.7;
}
.page-contact a.contact-card__v:hover {
  text-decoration: underline;
  text-underline-offset: 4px;
}
.page-contact .contact-card__note {
  margin: 10px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--ink-muted);
}

.page-contact .subject-tpl {
  position: relative;
  margin-top: 18px;
  padding: 16px 18px;
  border: 1px dashed var(--line);
  border-radius: var(--r-md);
  background: rgba(27, 42, 91, 0.22);
}
.page-contact .subject-tpl__label {
  margin: 0 0 10px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-muted);
}
.page-contact .subject-tpl__code {
  display: block;
  padding: 10px 12px;
  border-radius: var(--r-sm);
  background: rgba(7, 21, 18, 0.75);
  border: 1px solid var(--line-soft);
  font-family: var(--font-num);
  font-size: 14px;
  color: var(--amber);
  letter-spacing: 0.02em;
  user-select: all;
  word-break: break-all;
}
.page-contact .subject-tpl__hint {
  margin: 10px 0 0;
  font-size: 12px;
  line-height: 1.65;
  color: var(--ink-muted);
}

/* ---------- 右侧内容流 ---------- */
.page-contact .contact-flow {
  min-width: 0;
  display: grid;
  gap: clamp(32px, 5vw, 56px);
}

/* 索引 */
.page-contact .contact-index {
  padding: 16px 18px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: var(--bg-panel-2);
}
.page-contact .contact-index__title {
  margin: 0 0 12px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}
.page-contact .contact-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
}
.page-contact .contact-index .arena-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 10px;
  border-radius: var(--r-sm);
  color: var(--ink);
  font-size: 14px;
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color var(--t) ease, background var(--t) ease, border-color var(--t) ease;
}
.page-contact .contact-index .arena-index__link:hover {
  color: var(--cyan);
  background: rgba(38, 247, 208, 0.07);
  border-left-color: var(--cyan);
}
.page-contact .contact-index .arena-index__link[data-active] {
  color: var(--cyan);
  border-left-color: var(--amber);
  background: rgba(38, 247, 208, 0.06);
}
.page-contact .contact-index .arena-index__num {
  font-family: var(--font-num);
  font-size: 11px;
  color: var(--amber);
  letter-spacing: 0.08em;
}

/* 章节公共 */
.page-contact .contact-block {
  scroll-margin-top: 108px;
}
.page-contact .contact-block .arena-section__label {
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--amber);
}
.page-contact .contact-block__title {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(24px, 3.6vw, 34px);
  line-height: 1.25;
  color: var(--ink);
}
.page-contact .contact-block__intro {
  margin: 0 0 22px;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-muted);
}
.page-contact .contact-block__tail {
  margin: 24px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line-soft);
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-muted);
}

/* 支持范围 */
.page-contact .scope-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
.page-contact .scope-item {
  padding: 20px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: var(--bg-panel);
  transition: border-color var(--t) ease, transform var(--t) ease;
}
.page-contact .scope-item:hover {
  border-color: var(--cyan);
  transform: translateY(-2px);
}
.page-contact .scope-item h3 {
  margin: 12px 0 10px;
  font-size: 16px;
  font-weight: 500;
  line-height: 1.5;
  color: var(--ink);
}
.page-contact .scope-item p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-muted);
}
.page-contact .scope-item__via {
  margin: 0 !important;
  padding-top: 10px;
  border-top: 1px dashed var(--line-soft);
  font-family: var(--font-num);
  font-size: 12px !important;
  color: var(--teal) !important;
  letter-spacing: 0.02em;
}

/* 回复节奏 */
.page-contact .response-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}
.page-contact .response-split__lead {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
}
.page-contact .response-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}
.page-contact .response-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-muted);
}
.page-contact .response-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 2px;
  background: var(--cyan);
}
.page-contact .response-list strong {
  color: var(--ink);
  font-weight: 500;
}
.page-contact .response-split__card {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, rgba(27, 42, 91, 0.5), var(--bg-panel-2));
}
.page-contact .response-split__card-label {
  margin: 0 0 12px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-muted);
}
.page-contact .response-split__card-code {
  margin: 0 0 14px;
  padding: 14px 16px;
  border-radius: var(--r-sm);
  background: rgba(7, 21, 18, 0.8);
  border: 1px solid var(--line-soft);
  font-family: var(--font-num);
  font-size: 16px;
  color: var(--amber);
  letter-spacing: 0.03em;
  user-select: all;
  word-break: break-all;
}
.page-contact .response-split__card-body {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ink-muted);
}

/* 地址与备案 */
.page-contact .location-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
.page-contact .location-list {
  margin: 0 0 18px;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}
.page-contact .location-list__row {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 12px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line-soft);
}
.page-contact .location-list dt {
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-muted);
  padding-top: 3px;
}
.page-contact .location-list dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ink);
}
.page-contact .location-list dd a {
  word-break: break-all;
}
.page-contact .location-note {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--ink-muted);
}

.page-contact .location-split__map {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: #041210;
}
.page-contact .location-split__map::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    var(--scan) 0 1px,
    transparent 1px 6px
  );
  opacity: 0.45;
  pointer-events: none;
}
.page-contact .location-split__map img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-contact .location-split__map figcaption {
  padding: 10px 16px 13px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-muted);
  border-top: 1px solid var(--line-soft);
}

/* 合作与反馈 */
.page-contact .partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
.page-contact .partner-card {
  padding: 22px 20px;
  border-radius: var(--r-md);
  border: 1px solid var(--line-soft);
  background: var(--bg-panel);
  position: relative;
  overflow: hidden;
  transition: transform var(--t) ease, border-color var(--t) ease;
}
.page-contact .partner-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
}
.page-contact .partner-card--teal::before { background: var(--teal); }
.page-contact .partner-card--amber::before { background: var(--amber); }
.page-contact .partner-card--indigo::before { background: var(--indigo); }
.page-contact .partner-card:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
}
.page-contact .partner-card h3 {
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 500;
  color: var(--ink);
}
.page-contact .partner-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-muted);
}

/* 场景折叠 */
.page-contact .scenario-list {
  display: grid;
  gap: 10px;
}
.page-contact .scenario-item {
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: var(--bg-panel-2);
  padding: 0;
  transition: border-color var(--t) ease;
}
.page-contact .scenario-item:hover,
.page-contact .scenario-item[open] {
  border-color: var(--cyan);
}
.page-contact .scenario-item summary {
  cursor: pointer;
  padding: 16px 44px 16px 18px;
  position: relative;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.6;
  color: var(--ink);
  list-style: none;
}
.page-contact .scenario-item summary::-webkit-details-marker {
  display: none;
}
.page-contact .scenario-item summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-num);
  font-size: 18px;
  color: var(--cyan);
  transition: transform var(--t) ease;
}
.page-contact .scenario-item[open] summary::after {
  content: "–";
}
.page-contact .scenario-item .arena-details__body {
  padding: 0 18px 18px;
}
.page-contact .scenario-item .arena-details__body p {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-contact .scope-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-contact .partner-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-contact .partner-card--indigo {
    grid-column: span 2;
  }
  .page-contact .contact-index__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-contact .contact-hero__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  }
  .page-contact .response-split {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
  }
  .page-contact .location-split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 980px) {
  .page-contact .contact-layout {
    grid-template-columns: minmax(300px, 350px) minmax(0, 1fr);
    align-items: start;
  }
  .page-contact .contact-rail {
    position: sticky;
    top: 104px;
  }
  .page-contact .contact-index__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-contact .partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-contact .partner-card--indigo {
    grid-column: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact *,
  .page-contact *::before,
  .page-contact *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}