.page-contact {
  --contact-gap: clamp(22px, 4vw, 42px);
  --contact-panel: #0E1F1A;
}

.page-contact a:focus-visible,
.page-contact summary:focus-visible,
.page-contact [tabindex="0"]:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-contact .visually-plain {
  font-size: 0;
  line-height: 0;
  margin: 0;
  color: transparent;
  user-select: none;
}

/* ---------- 首屏 ---------- */
.page-contact .contact-hero {
  padding-block: clamp(24px, 4vw, 44px) clamp(40px, 7vw, 84px);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(56, 242, 200, .10), transparent 62%),
    radial-gradient(90% 80% at 0% 20%, rgba(139, 92, 246, .10), transparent 66%);
}

.page-contact .contact-hero .breadcrumb {
  margin-bottom: clamp(26px, 5vw, 54px);
}

.page-contact .contact-hero-grid {
  display: grid;
  gap: var(--contact-gap);
  align-items: start;
}

.page-contact .contact-hero-copy .eyebrow {
  margin: 0 0 14px;
}

.page-contact .contact-title {
  font-weight: 200;
  font-size: clamp(2.1rem, 7.4vw, 4.4rem);
  line-height: 1.08;
  letter-spacing: -.02em;
  margin: 0 0 20px;
  max-width: 16ch;
}

.page-contact .contact-lede {
  max-width: 48ch;
  margin: 0;
}

.page-contact .contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 4vw, 36px);
}

.page-contact .contact-hero-media {
  margin: 0;
}

.page-contact .contact-hero-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 双栏骨架 ---------- */
.page-contact .contact-body {
  padding-bottom: clamp(56px, 9vw, 120px);
}

.page-contact .contact-layout {
  display: grid;
  gap: clamp(32px, 5vw, 60px);
  align-items: start;
}

/* ---------- 左侧联系栏 ---------- */
.page-contact .contact-rail {
  border: 2px solid var(--line);
  background: var(--contact-panel);
  box-shadow: var(--shadow-2);
  padding: clamp(18px, 3vw, 26px);
  display: grid;
  gap: 20px;
  scroll-margin-top: 110px;
}

.page-contact .rail-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--muted-dim);
}

.page-contact .channel-block {
  border-top: 1px solid var(--line-soft);
  padding-top: 16px;
}

.page-contact .channel-kicker {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-contact .channel-value {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.5;
  color: var(--text);
  word-break: break-word;
}

.page-contact .channel-value--phone {
  font-size: clamp(1.25rem, 4.4vw, 1.6rem);
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-contact .channel-value--addr {
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--text);
}

.page-contact .channel-fit {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}

.page-contact .response-clock {
  border-top: 2px solid var(--line);
  padding-top: 18px;
  display: grid;
  gap: 4px;
}

.page-contact .clock-label {
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted-dim);
}

.page-contact .clock-num {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(2.6rem, 11vw, 3.6rem);
  line-height: 1;
  color: var(--amber);
}

.page-contact .clock-unit {
  font-size: 13px;
  color: var(--text);
  letter-spacing: .06em;
}

.page-contact .clock-note {
  margin: 8px 0 0;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 右侧主内容 ---------- */
.page-contact .contact-main > * + * {
  margin-top: clamp(48px, 8vw, 88px);
}

.page-contact .contact-block {
  scroll-margin-top: 110px;
}

.page-contact .block-mark {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-contact .contact-main h2 {
  font-weight: 300;
  font-size: clamp(1.55rem, 4vw, 2.25rem);
  line-height: 1.24;
  letter-spacing: -.01em;
  margin: 0 0 14px;
  max-width: 22ch;
}

.page-contact .block-lead {
  margin: 0;
  max-width: 54ch;
  color: var(--muted);
  line-height: 1.85;
}

/* 五要素阶梯网格 */
.page-contact .element-grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(24px, 4vw, 34px);
}

.page-contact .element {
  position: relative;
  border: 2px solid var(--line);
  background: var(--ink-2);
  padding: 18px 18px 16px;
  box-shadow: var(--shadow-1);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-contact .element:hover,
.page-contact .element:focus-within,
.page-contact .element:focus {
  transform: translateY(-3px);
  border-color: var(--cyan);
  box-shadow: var(--shadow-2);
}

.page-contact .element-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 12px;
  color: var(--cyan);
  letter-spacing: .1em;
  margin-bottom: 8px;
}

.page-contact .element h3 {
  margin: 0 0 8px;
  font-size: 1.02rem;
  font-weight: 500;
  letter-spacing: .01em;
  color: var(--text);
}

.page-contact .element p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-contact .element-hint {
  display: block;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  margin-top: 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--cyan);
  border-top: 1px dashed var(--line-soft);
  transition: opacity var(--dur) var(--ease), max-height var(--dur) var(--ease), margin-top var(--dur) var(--ease), padding-top var(--dur) var(--ease);
}

.page-contact .element:hover .element-hint,
.page-contact .element:focus-within .element-hint,
.page-contact .element:focus .element-hint {
  opacity: 1;
  max-height: 8em;
  margin-top: 10px;
  padding-top: 10px;
}

/* 示例反馈 */
.page-contact .example-quote {
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 20px 20px 18px;
  background: var(--ink-3);
  border: 2px solid var(--line);
  border-left: 4px solid var(--cyan);
  box-shadow: var(--shadow-1);
}

.page-contact .example-quote blockquote {
  margin: 0;
}

.page-contact .example-quote blockquote p {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.85;
  color: var(--text);
}

.page-contact .example-quote blockquote p:last-child {
  margin-bottom: 0;
}

.page-contact .example-quote figcaption {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px dashed var(--line-soft);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* 处理流程 */
.page-contact .flow {
  display: grid;
  gap: 14px;
  margin-top: clamp(24px, 4vw, 34px);
}

.page-contact .flow-step {
  position: relative;
  border: 2px solid var(--line);
  background: var(--ink-2);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-contact .flow-step:hover,
.page-contact .flow-step[open] {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-contact .flow-step summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 14px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
}

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

.page-contact .flow-step summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--cyan);
}

.page-contact .flow-step[open] summary::after {
  content: "–";
}

.page-contact .flow-num {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--amber);
}

.page-contact .flow-body {
  padding: 0 16px 16px;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-contact .flow-figure {
  margin: clamp(24px, 4vw, 34px) 0 0;
}

.page-contact .flow-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

/* 补充材料 */
.page-contact .material-list {
  display: grid;
  gap: 14px;
  margin-top: clamp(24px, 4vw, 34px);
}

.page-contact .material {
  border: 2px solid var(--line);
  border-left-width: 4px;
  border-left-color: var(--cyan);
  background: var(--ink-2);
  padding: 16px 18px;
}

.page-contact .material:nth-child(2) {
  border-left-color: var(--amber);
}

.page-contact .material:nth-child(3) {
  border-left-color: var(--violet);
}

.page-contact .material--alert {
  background: var(--amber-soft);
  border-left-color: var(--amber);
}

.page-contact .material h3 {
  margin: 0 0 8px;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text);
}

.page-contact .material p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

/* 合作与建议 */
.page-contact .coop-grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(24px, 4vw, 34px);
}

.page-contact .coop-card {
  border: 2px solid var(--line);
  background: var(--ink-3);
  padding: 18px;
  box-shadow: var(--shadow-1);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-contact .coop-card:hover {
  transform: translateY(-3px);
  border-color: var(--cyan);
  box-shadow: var(--shadow-2);
}

.page-contact .coop-card h3 {
  margin: 12px 0 10px;
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text);
}

.page-contact .coop-card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-contact .coop-subject {
  margin-top: 12px !important;
  padding-top: 10px;
  border-top: 1px dashed var(--line-soft);
  font-family: var(--font-mono);
  font-size: 12px !important;
  color: var(--amber) !important;
}

.page-contact .coop-note {
  margin: 20px 0 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-contact .coop-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: border-color var(--dur) var(--ease);
}

.page-contact .coop-note a:hover {
  border-bottom-color: var(--cyan);
}

/* 收束段 */
.page-contact .contact-tail {
  border-top: 2px solid var(--line);
  padding-top: clamp(28px, 4vw, 40px);
  max-width: 640px;
}

.page-contact .contact-tail h2 {
  font-size: clamp(1.3rem, 3.4vw, 1.75rem);
  margin-bottom: 10px;
}

.page-contact .contact-tail > p {
  margin: 0 0 20px;
  color: var(--muted);
  line-height: 1.85;
}

.page-contact .tail-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-contact .tail-links li {
  border-bottom: 1px dashed var(--line-soft);
}

.page-contact .tail-links a {
  display: block;
  padding: 12px 0;
  color: var(--text);
  text-decoration: none;
  font-size: 14.5px;
  transition: transform var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-contact .tail-links a:hover {
  transform: translateX(4px);
  color: var(--cyan);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-contact .element-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-contact .element:nth-child(even) {
    margin-top: 20px;
  }

  .page-contact .element--wide {
    grid-column: 1 / -1;
    margin-top: 0;
  }

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

  .page-contact .coop-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-contact .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

  .page-contact .flow-step:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 26px;
    right: -19px;
    width: 20px;
    border-top: 2px dashed var(--line-soft);
    pointer-events: none;
  }
}

@media (min-width: 900px) {
  .page-contact .contact-hero-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: end;
  }

  .page-contact .contact-hero-media {
    transform: translateY(18px);
  }

  .page-contact .contact-layout {
    grid-template-columns: minmax(0, 310px) minmax(0, 1fr);
  }

  .page-contact .contact-rail {
    position: sticky;
    top: 104px;
  }

  .page-contact .element-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-contact .element:nth-child(2) {
    margin-top: 22px;
  }

  .page-contact .element:nth-child(3) {
    margin-top: 44px;
  }

  .page-contact .element:nth-child(4) {
    margin-top: 0;
  }

  .page-contact .element--wide {
    grid-column: span 2;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .element,
  .page-contact .element-hint,
  .page-contact .flow-step,
  .page-contact .coop-card,
  .page-contact .tail-links a {
    transition: none;
  }

  .page-contact .element:hover,
  .page-contact .element:focus-within,
  .page-contact .element:focus,
  .page-contact .flow-step:hover,
  .page-contact .flow-step[open],
  .page-contact .coop-card:hover,
  .page-contact .tail-links a:hover,
  .page-contact .contact-hero-media {
    transform: none;
  }
}
<<<END>>>