.page-contact {
  --c-gap: clamp(18px, 3vw, 34px);
  --c-cut: 16px;
  display: block;
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-contact .crumb-sep {
  margin: 0 .55em;
  font-family: var(--font-mono);
  color: var(--slate-300);
  opacity: .55;
}

.page-contact .visually-hidden-title {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* ---------- 首屏 ---------- */
.page-contact .contact-hero {
  display: grid;
  gap: var(--c-gap);
  padding: clamp(22px, 3.4vw, 40px) 0 clamp(32px, 5vw, 60px);
}

.page-contact .hero-copy {
  min-width: 0;
}

.page-contact .hero-title {
  margin: .28em 0 .2em;
  font-family: var(--font-display);
  font-size: clamp(2.3rem, 7vw, 4.4rem);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing: -.02em;
  color: var(--paper-100);
}

.page-contact .hero-title::after {
  content: "";
  display: block;
  width: 78px;
  height: 4px;
  margin-top: 18px;
  background: linear-gradient(90deg, var(--amber-500), var(--amber-300));
  clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.page-contact .hero-lead {
  max-width: 54ch;
  margin: 0;
  font-size: clamp(1rem, 1.6vw, 1.1rem);
  line-height: 1.78;
  color: var(--slate-300);
}

.page-contact .hero-tools {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
  margin-top: clamp(22px, 3vw, 30px);
  padding-top: 18px;
  border-top: 1px solid var(--line-soft);
}

.page-contact .link-arrow {
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .04em;
  color: var(--cyan-200);
  text-decoration: none;
  padding-bottom: 3px;
  border-bottom: 1px solid var(--line-strong);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-contact .link-arrow:hover,
.page-contact .link-arrow:focus-visible {
  color: var(--amber-300);
  border-color: var(--amber-500);
}

.page-contact .hero-visual {
  margin: 0;
  position: relative;
  background: linear-gradient(140deg, rgba(43, 227, 210, .14), rgba(6, 16, 30, 0) 62%);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-contact .hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(.85) contrast(1.05);
}

/* ---------- 通用小节头 ---------- */
.page-contact .section-head {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: clamp(18px, 2.6vw, 28px);
}

.page-contact .section-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -.01em;
  color: var(--paper-100);
}

.page-contact .section-note {
  max-width: 60ch;
  margin: 0;
  font-size: .95rem;
  line-height: 1.7;
  color: var(--slate-300);
}

/* ---------- 渠道卡 ---------- */
.page-contact .contact-channels {
  margin-top: clamp(20px, 3.4vw, 40px);
}

.page-contact .channel-grid {
  display: grid;
  gap: 16px;
}

.page-contact .channel-card {
  position: relative;
  padding: clamp(18px, 2.4vw, 26px);
  padding-left: clamp(22px, 2.8vw, 30px);
  background: linear-gradient(158deg, rgba(19, 38, 61, .94), rgba(11, 27, 46, .94));
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - var(--c-cut)) 0, 100% var(--c-cut), 100% 100%, 0 100%);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-contact .channel-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--cyan-400);
  opacity: .8;
}

.page-contact .channel-card--mail::before {
  background: var(--amber-500);
}

.page-contact .channel-card--addr::before {
  background: var(--slate-300);
  opacity: .4;
}

.page-contact .channel-card:hover {
  background: linear-gradient(158deg, rgba(19, 38, 61, 1), rgba(11, 27, 46, .98));
  border-color: var(--line-strong);
}

.page-contact .channel-kicker {
  margin: 0 0 12px;
  font-size: .74rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--cyan-200);
}

.page-contact .channel-card--mail .channel-kicker {
  color: var(--amber-300);
}

.page-contact .channel-value {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: clamp(1rem, 2.7vw, 1.4rem);
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: .01em;
  color: var(--amber-300);
  word-break: break-word;
}

.page-contact .channel-value--tel {
  font-size: clamp(1.4rem, 4.4vw, 2.3rem);
  letter-spacing: .05em;
  color: var(--amber-500);
}

.page-contact .channel-value--addr {
  font-family: var(--font-body);
  font-size: clamp(.98rem, 2vw, 1.12rem);
  font-weight: 500;
  letter-spacing: 0;
  line-height: 1.6;
  color: var(--paper-100);
}

.page-contact .channel-note {
  margin: 0;
  font-size: .92rem;
  line-height: 1.72;
  color: var(--slate-300);
}

/* ---------- 技术问题提交 ---------- */
.page-contact .contact-prep {
  display: grid;
  gap: var(--c-gap);
  margin-top: clamp(44px, 6.5vw, 84px);
  padding-top: clamp(26px, 4vw, 44px);
  border-top: 1px solid var(--line-soft);
}

.page-contact .prep-copy {
  min-width: 0;
}

.page-contact .prep-lead {
  margin: 12px 0 22px;
  font-size: .98rem;
  line-height: 1.75;
  color: var(--slate-300);
}

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

.page-contact .check-item {
  position: relative;
  padding: 14px 16px;
  background: rgba(19, 38, 61, .55);
  border: 1px solid var(--line-soft);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-contact .check-item:hover {
  border-color: var(--line-strong);
}

.page-contact .check-input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-contact .check-label {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  cursor: pointer;
  font-size: .96rem;
  line-height: 1.7;
  color: var(--slate-300);
}

.page-contact .check-label strong {
  color: var(--paper-100);
  font-weight: 600;
}

.page-contact .check-box {
  position: relative;
  flex: 0 0 auto;
  width: 20px;
  height: 20px;
  margin-top: 2px;
  background: rgba(6, 16, 30, .8);
  border: 1px solid var(--line-strong);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-contact .check-input:checked + .check-label .check-box {
  background: var(--cyan-400);
  border-color: var(--cyan-200);
}

.page-contact .check-input:checked + .check-label .check-box::after {
  content: "";
  position: absolute;
  left: 6px;
  top: 3px;
  width: 5px;
  height: 10px;
  border-right: 2px solid var(--ink-900);
  border-bottom: 2px solid var(--ink-900);
  transform: rotate(42deg);
}

.page-contact .check-input:focus-visible + .check-label .check-box {
  outline: 2px solid var(--amber-500);
  outline-offset: 2px;
}

.page-contact .prep-side {
  min-width: 0;
}

.page-contact .prep-visual {
  margin: 0 0 6px;
  border: 1px solid var(--line-soft);
  background: linear-gradient(200deg, rgba(216, 76, 240, .1), rgba(6, 16, 30, 0) 60%);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 18px 100%, 0 calc(100% - 18px));
}

.page-contact .prep-visual img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(.8) contrast(1.05);
}

.page-contact .step-rail {
  list-style: none;
  margin: 18px 0 0;
  padding: 0 0 0 22px;
  position: relative;
  display: grid;
  gap: 12px;
}

.page-contact .step-rail::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan-400), rgba(43, 227, 210, .06));
}

.page-contact .step {
  position: relative;
  padding: 10px 14px;
  background: rgba(11, 27, 46, .7);
  border: 1px solid var(--line-soft);
  transition: border-color var(--dur) var(--ease);
}

.page-contact .step:hover,
.page-contact .step:focus-within {
  border-color: var(--line-strong);
}

.page-contact .step::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 15px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan-400);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-contact .step:hover::before,
.page-contact .step:focus-within::before {
  background: var(--amber-500);
  border-color: var(--amber-300);
}

.page-contact .step-title {
  display: block;
  font-size: .8rem;
  letter-spacing: .08em;
  color: var(--cyan-200);
}

.page-contact .step-desc {
  display: block;
  margin-top: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: .9rem;
  line-height: 1.65;
  color: var(--slate-300);
  transition: max-height var(--dur) var(--ease), opacity var(--dur) var(--ease), margin-top var(--dur) var(--ease);
}

/* ---------- 服务范围 ---------- */
.page-contact .contact-scope {
  margin-top: clamp(44px, 6.5vw, 84px);
}

.page-contact .scope-list {
  display: grid;
  border-top: 1px solid var(--line-soft);
}

.page-contact .scope-row {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-contact .scope-key {
  margin: 0;
  font-size: .78rem;
  letter-spacing: .18em;
  color: var(--amber-300);
}

.page-contact .scope-text {
  margin: 0;
  font-size: .96rem;
  line-height: 1.78;
  color: var(--slate-300);
}

/* ---------- 合作与反馈 ---------- */
.page-contact .contact-coop {
  margin-top: clamp(44px, 6.5vw, 84px);
}

.page-contact .coop-grid {
  display: grid;
  gap: 16px;
}

.page-contact .coop-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: clamp(20px, 2.8vw, 30px);
  background: rgba(11, 27, 46, .9);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-contact .coop-card:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.page-contact .coop-card--amber {
  background: linear-gradient(150deg, rgba(244, 183, 64, .13), rgba(11, 27, 46, .94) 55%);
}

.page-contact .coop-card--magenta {
  background: linear-gradient(150deg, rgba(216, 76, 240, .13), rgba(11, 27, 46, .94) 55%);
}

.page-contact .coop-kicker {
  margin: 0 0 10px;
  font-size: .72rem;
  letter-spacing: .18em;
  color: var(--cyan-200);
}

.page-contact .coop-card--amber .coop-kicker {
  color: var(--amber-300);
}

.page-contact .coop-card--magenta .coop-kicker {
  color: var(--magenta-500);
}

.page-contact .coop-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.4vw, 1.4rem);
  font-weight: 700;
  color: var(--paper-100);
}

.page-contact .coop-text {
  margin: 0 0 20px;
  font-size: .94rem;
  line-height: 1.75;
  color: var(--slate-300);
}

.page-contact .coop-link {
  margin-top: auto;
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .06em;
  color: var(--amber-300);
  text-decoration: none;
  padding-bottom: 3px;
  border-bottom: 1px solid rgba(244, 183, 64, .45);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-contact .coop-card--magenta .coop-link {
  color: var(--cyan-200);
  border-color: var(--line-strong);
}

.page-contact .coop-link:hover,
.page-contact .coop-link:focus-visible {
  color: var(--paper-100);
  border-color: var(--paper-100);
}

/* ---------- 备案与法律 ---------- */
.page-contact .contact-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  margin-top: clamp(40px, 6vw, 76px);
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
}

.page-contact .legal-icp {
  margin: 0;
  font-size: .78rem;
  letter-spacing: .08em;
  color: var(--slate-300);
  opacity: .78;
}

.page-contact .legal-links {
  display: flex;
  gap: 20px;
}

.page-contact .legal-links a {
  font-size: .82rem;
  color: var(--slate-300);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-contact .legal-links a:hover,
.page-contact .legal-links a:focus-visible {
  color: var(--cyan-200);
  border-color: var(--line-strong);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-contact .channel-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-contact .channel-card--addr {
    grid-column: 1 / -1;
  }

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

  .page-contact .scope-row {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-contact .contact-hero {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: center;
  }

  .page-contact .contact-prep {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
  }

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

  .page-contact .channel-card--addr {
    grid-column: auto;
  }

  .page-contact .channel-card--mail {
    transform: translateY(-10px);
  }

  .page-contact .step:hover .step-desc,
  .page-contact .step:focus-within .step-desc {
    max-height: 8em;
    opacity: 1;
    margin-top: 8px;
  }
}

@media (max-width: 899px) {
  .page-contact .step-desc {
    max-height: none;
    opacity: 1;
    margin-top: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .channel-card,
  .page-contact .check-item,
  .page-contact .check-box,
  .page-contact .step,
  .page-contact .step::before,
  .page-contact .step-desc,
  .page-contact .coop-card,
  .page-contact .coop-link,
  .page-contact .link-arrow,
  .page-contact .legal-links a {
    transition: none;
  }

  .page-contact .coop-card:hover {
    transform: none;
  }
}
<<<END>>>