.page-contact {
  --contact-border: var(--border-thick);
  --contact-radius: var(--radius-md);
  --contact-line: rgba(242, 245, 250, 0.14);
  --contact-cyan-line: rgba(0, 229, 255, 0.32);
  --contact-hero-space: clamp(40px, 7vh, 72px);
  background: var(--c-deep);
  color: var(--c-white);
  position: relative;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ===== 面包屑 ===== */
.page-contact .breadcrumb {
  margin-top: var(--space-md);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
}
.page-contact .breadcrumb .is-current {
  color: var(--c-cyan);
}

/* ===== 首屏 Hero ===== */
.page-contact .contact-hero {
  position: relative;
  min-height: clamp(480px, 72vh, 660px);
  display: flex;
  align-items: center;
  margin-bottom: var(--space-xl);
  border-bottom: var(--contact-border) solid var(--c-black);
  isolation: isolate;
}
.page-contact .contact-hero-media {
  position: absolute;
  inset: 0;
  z-index: -2;
  overflow: hidden;
}
.page-contact .contact-hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.36;
  filter: saturate(0.88) contrast(1.06);
}
.page-contact .contact-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(0, 229, 255, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 255, 0.07) 1px, transparent 1px);
  background-size: 38px 38px;
  pointer-events: none;
}
.page-contact .contact-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(105deg, rgba(10, 17, 40, 0.92) 0%, rgba(10, 17, 40, 0.58) 58%, rgba(30, 42, 90, 0.38) 100%);
}
.page-contact .contact-hero-inner {
  max-width: 840px;
  padding: var(--contact-hero-space) 0;
}
.page-contact .hero-index {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  border: 1px solid var(--c-cyan);
  border-radius: var(--radius-sm);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--c-cyan);
  margin-bottom: var(--space-md);
  background: rgba(0, 229, 255, 0.06);
}
.page-contact .contact-hero-title {
  font-family: var(--font-display);
  font-size: clamp(46px, 9vw, 116px);
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -0.03em;
  margin: 0 0 var(--space-lg);
  text-transform: uppercase;
}
.page-contact .contact-hero-desc {
  font-size: clamp(16px, 2vw, 20px);
  line-height: 1.75;
  color: var(--c-ash);
  max-width: 640px;
  margin-bottom: var(--space-xl);
}
.page-contact .contact-hero-desc strong {
  color: var(--c-green);
  font-weight: 600;
}
.page-contact .hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-xl);
  border-top: var(--border-thin) solid var(--contact-line);
  padding-top: var(--space-md);
}
.page-contact .hero-stat {
  display: grid;
  gap: var(--space-xs);
}
.page-contact .stat-label {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--c-ash);
}
.page-contact .stat-value {
  font-size: 15px;
  color: var(--c-white);
}
.page-contact .stat-value.mono {
  color: var(--c-cyan);
}

/* ===== 章节 ===== */
.page-contact .contact-section {
  padding-block: clamp(40px, 6vw, 88px);
  scroll-margin-top: calc(var(--header-height) + var(--header-top-offset) + 12px);
}
.page-contact .contact-section-alt {
  background: var(--c-midnight);
  border-block: var(--border-thin) solid var(--contact-line);
}
.page-contact .section-chapter {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  margin-bottom: clamp(28px, 4vw, 48px);
  border-bottom: 1px solid var(--contact-cyan-line);
  padding-bottom: var(--space-md);
}
.page-contact .chapter-index {
  font-size: 42px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-cyan);
  flex: 0 0 auto;
  letter-spacing: 0.04em;
}
.page-contact .chapter-heading {
  flex: 1;
}
.page-contact .chapter-heading .h2 {
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 800;
  line-height: 1.1;
  margin: 0 0 var(--space-sm);
}
.page-contact .chapter-heading .chapter-desc {
  color: var(--c-ash);
  font-size: 15px;
  line-height: 1.7;
  margin: 0;
}

/* ===== 01 客服邮箱 ===== */
.page-contact .email-stage {
  position: relative;
  display: grid;
  gap: var(--space-xl);
  border: var(--contact-border) solid var(--c-black);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(30, 42, 90, 0.65), rgba(10, 17, 40, 0.94));
  box-shadow: var(--shadow-hard-sm);
  padding: clamp(24px, 4vw, 48px);
  overflow: hidden;
}
.page-contact .email-stage::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--c-green), var(--c-cyan));
}
.page-contact .email-icon-wrap {
  position: relative;
  width: min(220px, 74vw);
  margin-inline: auto;
}
.page-contact .email-icon {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  border: var(--border-thin) solid var(--contact-line);
  display: block;
}
.page-contact .email-icon-pulse {
  position: absolute;
  inset: -14%;
  border: 1px dashed var(--c-cyan);
  border-radius: var(--radius-lg);
  animation: pageContactOrbit 16s linear infinite;
  pointer-events: none;
  opacity: 0.5;
}
.page-contact .email-copy-zone {
  text-align: center;
  display: grid;
  gap: var(--space-sm);
  justify-items: center;
}
.page-contact .email-label {
  font-size: 14px;
  letter-spacing: 0.28em;
  color: var(--c-orange);
  font-weight: 600;
}
.page-contact .email-address {
  font-family: var(--font-mono);
  font-size: clamp(18px, 4vw, 50px);
  font-weight: 600;
  color: var(--c-white);
  letter-spacing: 0.02em;
  line-height: 1.2;
  word-break: break-all;
  text-shadow: 4px 4px 0 rgba(0, 229, 255, 0.24);
  background: rgba(0, 229, 255, 0.07);
  border: var(--border-thin) solid rgba(0, 229, 255, 0.38);
  border-radius: var(--radius-sm);
  padding: var(--space-sm) var(--space-md);
}
.page-contact .email-note {
  color: var(--c-ash);
  font-size: 14px;
  line-height: 1.7;
  max-width: 440px;
  margin: 0;
}
.page-contact .topic-presets {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: var(--space-sm);
  border-top: var(--border-thin) dashed var(--contact-line);
  padding-top: var(--space-lg);
}
.page-contact .preset-heading {
  width: 100%;
  text-align: center;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--c-ash);
}

/* ===== 02 来函地址 ===== */
.page-contact .address-card {
  position: relative;
  display: grid;
  gap: var(--space-md);
  border: var(--contact-border) solid var(--c-black);
  box-shadow: var(--shadow-hard-md);
  padding: clamp(24px, 4vw, 56px);
  clip-path: polygon(2.4% 0%, 100% 0%, 97.6% 100%, 0% 100%);
  background: linear-gradient(135deg, var(--c-deep), var(--c-midnight));
  max-width: 980px;
}
.page-contact .address-card-side {
  position: absolute;
  top: 16px;
  right: 16px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--c-green);
  border: 1px solid rgba(57, 255, 20, 0.5);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  text-align: center;
  line-height: 1.5;
}
.page-contact .address-card-main {
  max-width: 680px;
}
.page-contact .address-route {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  padding-right: 88px;
}
.page-contact .route-stop {
  display: inline-block;
  font-family: var(--font-display);
  font-size: clamp(16px, 2vw, 22px);
  font-weight: 700;
  color: var(--c-white);
  border: 1px solid var(--contact-line);
  background: rgba(0, 229, 255, 0.06);
  border-radius: var(--radius-sm);
  padding: var(--space-sm) var(--space-md);
  line-height: 1.3;
}
.page-contact .route-connect {
  color: var(--c-cyan);
  font-size: 18px;
  line-height: 1;
}
.page-contact .address-note {
  color: var(--c-ash);
  font-size: 15px;
  line-height: 1.75;
  margin: 0 0 var(--space-sm);
}
.page-contact .address-coords {
  display: inline-block;
  margin-top: var(--space-xs);
  font-size: 13px;
  color: var(--c-cyan);
  background: rgba(0, 229, 255, 0.08);
  border: 1px dashed rgba(0, 229, 255, 0.4);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  transition: background var(--duration), color var(--duration);
}
.page-contact .address-card:hover .address-coords {
  background: rgba(0, 229, 255, 0.18);
  color: var(--c-white);
}

/* ===== 03 回复承诺 ===== */
.page-contact .response-card {
  border: var(--contact-border) solid var(--c-black);
  border-radius: var(--radius-lg);
  background: var(--c-deep);
  box-shadow: var(--shadow-hard-sm);
  padding: clamp(24px, 4vw, 48px);
  max-width: 980px;
}
.page-contact .response-track {
  position: relative;
}
.page-contact .response-track-bg {
  height: 18px;
  border: var(--border-thin) solid var(--contact-line);
  border-radius: var(--radius-pill);
  background: rgba(242, 245, 250, 0.04);
  overflow: hidden;
}
.page-contact .response-track-fill {
  height: 100%;
  width: 52%;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-green));
  border-radius: var(--radius-pill);
  animation: pageContactResponse 3s ease-in-out infinite;
  transform-origin: left center;
}
.page-contact .response-track-marker {
  position: absolute;
  right: 4px;
  bottom: 26px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-green);
  letter-spacing: 0.1em;
}
.page-contact .response-labels {
  display: flex;
  justify-content: space-between;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
  flex-wrap: wrap;
}
.page-contact .response-label {
  font-size: 13px;
  color: var(--c-ash);
}
.page-contact .response-note {
  margin-top: var(--space-lg);
  border-top: var(--border-thin) dashed var(--contact-line);
  padding-top: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 14px;
  line-height: 1.6;
  color: var(--c-ash);
}
.page-contact .response-pulse-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--c-green);
  box-shadow: 0 0 0 0 rgba(57, 255, 20, 0.55);
  animation: pageContactPing 1.6s ease-out infinite;
  flex: 0 0 auto;
}

/* ===== 04 合作洽谈 ===== */
.page-contact .coop-grid {
  display: grid;
  gap: var(--space-md);
  grid-template-columns: 1fr;
  margin-bottom: var(--space-md);
}
.page-contact .coop-item {
  border: var(--border-thin) solid var(--contact-line);
  border-left: 4px solid var(--c-orange);
  background: rgba(30, 42, 90, 0.32);
  padding: var(--space-lg);
  border-radius: var(--contact-radius);
  transition: transform var(--duration) var(--ease-out), border-left-color var(--duration);
}
.page-contact .coop-item:hover {
  transform: translateY(-2px);
  border-left-color: var(--c-cyan);
}
.page-contact .coop-marker {
  font-size: 13px;
  color: var(--c-orange);
  font-weight: 700;
  letter-spacing: 0.12em;
  display: inline-block;
  border: 1px solid rgba(255, 90, 31, 0.5);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-sm);
}
.page-contact .coop-title {
  font-size: 18px;
  font-weight: 800;
  margin: 0 0 var(--space-xs);
}
.page-contact .coop-desc {
  font-size: 15px;
  color: var(--c-ash);
  line-height: 1.7;
  margin: 0;
}
.page-contact .coop-tip {
  color: var(--c-ash);
  font-size: 15px;
  line-height: 1.8;
  border-left: var(--contact-border) solid var(--c-green);
  padding-left: var(--space-md);
  background: rgba(57, 255, 20, 0.04);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  max-width: 980px;
}
.page-contact .coop-tip strong {
  color: var(--c-green);
}

/* ===== 底部更多 ===== */
.page-contact .contact-more {
  border-top: var(--contact-border) solid var(--c-black);
  background: var(--c-midnight);
  padding-block: clamp(32px, 5vw, 64px);
}
.page-contact .more-grid {
  display: grid;
  gap: var(--space-xl);
}
.page-contact .more-item {
  display: grid;
  gap: var(--space-xs);
}
.page-contact .more-label {
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--c-ash);
}
.page-contact .more-value {
  font-size: 20px;
  font-weight: 600;
  margin: 0;
  font-family: var(--font-mono);
  color: var(--c-white);
}
.page-contact .more-desc {
  color: var(--c-ash);
  font-size: 14px;
  line-height: 1.6;
  margin: 0;
}
.page-contact .more-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}
.page-contact .more-links .btn {
  border-radius: var(--radius-pill);
}

/* ===== 动画 ===== */
@keyframes pageContactOrbit {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}
@keyframes pageContactResponse {
  0%, 100% { opacity: 0.92; transform: scaleX(1); }
  50% { opacity: 0.54; transform: scaleX(0.92); }
}
@keyframes pageContactPing {
  0% { box-shadow: 0 0 0 0 rgba(57, 255, 20, 0.55); }
  70% { box-shadow: 0 0 0 12px rgba(57, 255, 20, 0); }
  100% { box-shadow: 0 0 0 0 rgba(57, 255, 20, 0); }
}

/* ===== 平板及以上 ===== */
@media (min-width: 768px) {
  .page-contact .email-stage {
    grid-template-columns: 200px 1fr;
    align-items: center;
  }
  .page-contact .email-icon-wrap {
    margin-inline: 0;
  }
  .page-contact .topic-presets {
    grid-column: 1 / -1;
  }
  .page-contact .address-card {
    grid-template-columns: 150px 1fr;
    align-items: center;
  }
  .page-contact .address-card-side {
    position: static;
    align-self: stretch;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin: calc(-1 * var(--space-md));
    border: 0;
    border-right: 1px solid rgba(57, 255, 20, 0.32);
    border-radius: 0;
    background: rgba(57, 255, 20, 0.04);
  }
  .page-contact .address-route {
    padding-right: 0;
  }
  .page-contact .coop-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-contact .more-grid {
    grid-template-columns: 1fr 1fr 1.2fr;
    align-items: start;
  }
}

/* ===== 桌面端 ===== */
@media (min-width: 1080px) {
  .page-contact .email-stage {
    grid-template-columns: 220px 1fr 1fr;
    align-items: center;
  }
  .page-contact .topic-presets {
    grid-column: auto;
  }
  .page-contact .preset-heading {
    width: auto;
    flex-basis: 100%;
    text-align: left;
  }
  .page-contact .contact-hero-title {
    font-size: clamp(72px, 8vw, 112px);
  }
}