/* ===== 联系与入口 · 页面专属样式 ===== */
.page-contact {
  --contact-line: rgba(192, 192, 192, 0.22);
  --contact-neon-soft: rgba(57, 255, 20, 0.14);
  --contact-card-pad: clamp(24px, 4vw, 40px);
  position: relative;
}

.page-contact img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ---- 首屏 ---- */
.page-contact__hero {
  position: relative;
  padding: 32px 0 72px;
  overflow: hidden;
}

.page-contact__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--contact-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--contact-line) 1px, transparent 1px);
  background-size: 56px 56px;
  pointer-events: none;
}

.page-contact__hero-axes {
  display: none;
}

.page-contact__hero .breadcrumb {
  position: relative;
  margin-bottom: 48px;
}

.page-contact__hero-inner {
  position: relative;
  max-width: 720px;
}

.page-contact__hero-index {
  margin-bottom: 18px;
}

.page-contact__title {
  margin: 0 0 18px;
  font-family: var(--font-heading);
  font-size: clamp(36px, 7vw, 64px);
  line-height: 1.08;
  color: var(--color-paper);
  letter-spacing: 0.01em;
}

.page-contact__title-sub {
  display: block;
  margin-top: 10px;
  font-family: var(--font-body);
  font-size: clamp(18px, 3vw, 26px);
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-silver);
}

.page-contact__lead {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-silver);
  max-width: 40em;
}

/* ---- 渠道坐标 ---- */
.page-contact__channels {
  padding-top: calc(var(--space-section) * 0.3);
}

.page-contact__coordinate {
  position: relative;
  margin-top: 36px;
}

.page-contact__coordinate::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 24px;
  bottom: 24px;
  width: 2px;
  background: repeating-linear-gradient(
    to bottom,
    var(--color-neon) 0 4px,
    transparent 4px 10px
  );
  opacity: 0.45;
}

.page-contact__channel-item {
  position: relative;
  margin: 0 0 20px 24px;
}

.page-contact__channel-item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 36px;
  width: 10px;
  height: 10px;
  background: var(--color-neon);
  transform: rotate(45deg);
  box-shadow: 0 0 0 4px var(--contact-neon-soft);
  z-index: 2;
}

.page-contact__channel-card,
.page-contact__usage-card,
.page-contact__service-hours,
.page-contact__service-response,
.page-contact__city-panel {
  position: relative;
}

.page-contact__channel-card::after,
.page-contact__usage-card::after,
.page-contact__service-hours::after,
.page-contact__service-response::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 2px solid transparent;
  clip-path: inherit;
  transition: border-color 0.3s var(--ease);
  pointer-events: none;
}

.page-contact__channel-card {
  padding: var(--contact-card-pad);
  background: var(--color-navy);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
  transition: transform 0.3s var(--ease);
}

.page-contact__channel-card--teal {
  background: var(--color-teal);
}

.page-contact__channel-card--indigo {
  background: var(--color-indigo);
}

.page-contact__channel-item:hover .page-contact__channel-card {
  transform: translateY(-3px);
}

.page-contact__channel-item:hover .page-contact__channel-card::after {
  border-color: var(--color-neon);
}

.page-contact__channel-card h3,
.page-contact__usage-card h3,
.page-contact__service-hours h3,
.page-contact__service-response h3 {
  margin: 14px 0 12px;
  font-family: var(--font-heading);
  font-size: 22px;
  line-height: 1.2;
  letter-spacing: 0.04em;
  color: var(--color-paper);
}

.page-contact__channel-value {
  display: block;
  margin: 0 0 10px;
  font-family: var(--font-data);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-paper);
  word-break: break-all;
}

.page-contact__channel-value a {
  color: var(--color-neon);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s var(--ease);
}

.page-contact__channel-value a:hover {
  border-bottom-color: var(--color-neon);
}

.page-contact__channel-card .text-note,
.page-contact__usage-card .text-note {
  margin: 0;
}

/* ---- 望京坐标 ---- */
.page-contact__city {
  padding-top: calc(var(--space-section) * 0.4);
}

.page-contact__city-panel {
  display: grid;
  gap: 28px;
  margin-top: 36px;
  padding: var(--contact-card-pad);
  background: var(--color-navy);
  clip-path: polygon(0 0, calc(100% - 32px) 0, 100% 32px, 100% 100%, 0 100%);
}

.page-contact__city-panel:hover::after {
  border-color: var(--color-neon);
}

.page-contact__city-text h2 {
  margin: 14px 0 16px;
  font-family: var(--font-heading);
  font-size: 28px;
  line-height: 1.2;
  color: var(--color-paper);
}

.page-contact__city-desc {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-silver);
}

.page-contact__city-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-contact__city-list li {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--contact-line);
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-paper);
}

.page-contact__city-list .text-data {
  min-width: 44px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--color-neon);
}

.page-contact__city-img {
  margin: 0;
}

/* ---- 服务时间与回复承诺 ---- */
.page-contact__service {
  padding-top: calc(var(--space-section) * 0.4);
}

.page-contact__service-grid {
  display: grid;
  gap: 20px;
  margin-top: 36px;
}

.page-contact__service-hours,
.page-contact__service-response {
  padding: var(--contact-card-pad);
}

.page-contact__service-hours {
  background: var(--color-wine);
  clip-path: polygon(0 0, calc(100% - 28px) 0, 100% 28px, 100% 100%, 0 100%);
}

.page-contact__service-hours::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 28px;
  height: 28px;
  background: linear-gradient(315deg, transparent 50%, rgba(57, 255, 20, 0.55) 50%);
  pointer-events: none;
}

.page-contact__service-response {
  background: var(--color-navy);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
}

.page-contact__service-hours:hover,
.page-contact__service-response:hover {
  transform: translateY(-3px);
}

.page-contact__service-hours:hover::after,
.page-contact__service-response:hover::after {
  border-color: var(--color-neon);
}

.page-contact__hours-value {
  margin: 0 0 12px;
  font-family: var(--font-data);
  font-size: 28px;
  line-height: 1.3;
  color: var(--color-paper);
}

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

.page-contact__promise-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-silver);
}

.page-contact__promise-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 8px;
  height: 2px;
  background: var(--color-neon);
}

.page-contact__service-img {
  margin: 0;
  max-width: 400px;
  width: 100%;
}

/* ---- 用途说明 ---- */
.page-contact__usage {
  padding-top: calc(var(--space-section) * 0.4);
}

.page-contact__usage-grid {
  display: grid;
  gap: 20px;
  margin-top: 36px;
}

.page-contact__usage-card {
  padding: var(--contact-card-pad);
  background: var(--color-navy);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
  transition: transform 0.3s var(--ease);
}

.page-contact__usage-card--contact {
  background: var(--color-indigo);
}

.page-contact__usage-card--support {
  background: var(--color-teal);
}

.page-contact__usage-card:hover {
  transform: translateY(-3px);
}

.page-contact__usage-card:hover::after {
  border-color: var(--color-neon);
}

.page-contact__usage-mail {
  display: block;
  margin: 0 0 10px;
  font-family: var(--font-data);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-paper);
  word-break: break-all;
}

.page-contact__usage-card .text-note {
  margin-bottom: 14px;
}

.page-contact__usage-card .link-underline {
  font-size: 14px;
}

.page-contact__usage-tip {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-top: 24px;
  padding: 20px 24px;
  background: rgba(255, 255, 255, 0.03);
  border-left: 2px solid var(--color-neon);
}

.page-contact__usage-tip .index-label {
  flex-shrink: 0;
}

.page-contact__usage-tip p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-silver);
}

/* ---- 帮助入口 ---- */
.page-contact__help {
  padding-top: calc(var(--space-section) * 0.4);
  padding-bottom: calc(var(--space-section) * 0.3);
}

.page-contact__help-panel {
  display: grid;
  gap: 24px;
  padding: var(--contact-card-pad);
  background: var(--color-deep);
  border: 1px solid var(--color-silver);
  clip-path: polygon(0 0, calc(100% - 28px) 0, 100% 28px, 100% 100%, 0 100%);
}

.page-contact__help-info h2 {
  margin: 14px 0 12px;
  font-family: var(--font-heading);
  font-size: 26px;
  line-height: 1.2;
  color: var(--color-paper);
}

.page-contact__help-info p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-silver);
  max-width: 46em;
}

.page-contact__help-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}

/* ---- 平板及以上 ---- */
@media (min-width: 768px) {
  .page-contact__hero {
    padding: 56px 0 96px;
  }

  .page-contact__hero-axes {
    display: block;
    position: absolute;
    right: 4%;
    top: 96px;
    width: 140px;
    height: 140px;
    opacity: 0.65;
    pointer-events: none;
  }

  .page-contact__hero-axis-x {
    position: absolute;
    left: 16px;
    right: 0;
    bottom: 16px;
    height: 1px;
    background: var(--color-silver);
  }

  .page-contact__hero-axis-x::after {
    content: "";
    position: absolute;
    right: 0;
    top: -4px;
    border-left: 7px solid var(--color-silver);
    border-top: 4px solid transparent;
    border-bottom: 4px solid transparent;
  }

  .page-contact__hero-axis-y {
    position: absolute;
    top: 0;
    bottom: 16px;
    left: 16px;
    width: 1px;
    background: var(--color-silver);
  }

  .page-contact__hero-axis-y::after {
    content: "";
    position: absolute;
    top: 0;
    left: -4px;
    border-bottom: 7px solid var(--color-silver);
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
  }

  .page-contact__hero-axis-note {
    position: absolute;
    left: 24px;
    bottom: 0;
    font-family: var(--font-data);
    font-size: 10px;
    letter-spacing: 0.1em;
    color: var(--color-neon);
  }

  .page-contact__city-panel {
    grid-template-columns: 1fr 1.1fr;
    align-items: center;
  }

  .page-contact__service-grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-contact__service-img {
    grid-column: 1 / -1;
    justify-self: center;
  }

  .page-contact__usage-grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-contact__help-panel {
    grid-template-columns: 1fr auto;
    align-items: center;
  }
}

/* ---- 桌面 ---- */
@media (min-width: 1024px) {
  .page-contact__hero {
    padding-top: 72px;
  }

  .page-contact__coordinate {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
    padding-top: 22px;
  }

  .page-contact__coordinate::before {
    left: 5%;
    right: 5%;
    top: 26px;
    bottom: auto;
    height: 2px;
    width: auto;
    background: repeating-linear-gradient(
      to right,
      var(--color-neon) 0 8px,
      transparent 8px 16px
    );
    opacity: 0.45;
  }

  .page-contact__channel-item {
    margin: 0;
    padding-top: 22px;
  }

  .page-contact__channel-item::before {
    left: 50%;
    top: 0;
    margin-left: -5px;
  }

  .page-contact__channel-item:hover .page-contact__channel-card {
    transform: translateY(-4px);
  }
}