.page-contact {
  --ch-cut: 44px;
}

.page-contact .breadcrumb {
  padding-top: 18px;
}

/* ---------- 首屏 ---------- */
.page-contact .ch-hero {
  position: relative;
  display: grid;
  gap: 14px;
  max-width: 940px;
  padding-top: clamp(18px, 3vw, 34px);
  padding-bottom: clamp(18px, 2.6vw, 28px);
}

.page-contact .ch-hero::before {
  content: "";
  position: absolute;
  top: -48px;
  right: -6vw;
  width: 52%;
  height: 220px;
  background: radial-gradient(ellipse at top right, rgba(0, 240, 192, .10), transparent 68%);
  pointer-events: none;
}

.page-contact .ch-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 6.2vw, 64px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--warm);
}

.page-contact .ch-mark {
  position: relative;
  display: inline-block;
  padding-bottom: .08em;
}

.page-contact .ch-mark::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), rgba(0, 240, 192, 0));
}

.page-contact .ch-hero__lead {
  margin: 0;
  max-width: 62ch;
}

/* ---------- 通栏图 ---------- */
.page-contact .ch-banner {
  padding-top: clamp(6px, 1.4vw, 14px);
  padding-bottom: clamp(10px, 2vw, 20px);
}

.page-contact .ch-banner .img-frame {
  border: 1px solid var(--line-soft);
}

/* ---------- 斜切双栏 ---------- */
.page-contact .ch-split {
  display: grid;
  gap: 0;
  border: 1px solid var(--line-soft);
  background: var(--ink-2);
}

.page-contact .ch-rail {
  position: relative;
  padding: clamp(24px, 4vw, 44px);
  background: linear-gradient(160deg, var(--ink-3) 0%, var(--ink) 100%);
}

.page-contact .ch-rail__h,
.page-contact .ch-paths__h {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--warm);
}

.page-contact .ch-rail__h::before,
.page-contact .ch-paths__h::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--orange);
  flex: none;
}

.page-contact .ch-line {
  display: grid;
  gap: 5px;
  padding: clamp(13px, 1.8vw, 18px) 0;
  border-bottom: 1px dashed var(--line-soft);
}

.page-contact .ch-line:last-of-type {
  border-bottom: 0;
}

.page-contact .ch-line__label {
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-contact .ch-line__value {
  font-family: var(--font-mono);
  font-size: clamp(16px, 2.4vw, 24px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--warm);
  word-break: break-all;
  user-select: all;
}

.page-contact .ch-line__value--sm {
  font-size: clamp(14px, 1.6vw, 17px);
  font-weight: 500;
  line-height: 1.6;
}

.page-contact .ch-line__note {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mist);
}

.page-contact .ch-rail__foot {
  margin: clamp(18px, 2.4vw, 24px) 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--body-text);
}

.page-contact .ch-rail__foot a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-contact .ch-paths {
  padding: clamp(24px, 4vw, 44px);
  background: var(--ink-2);
}

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

.page-contact .ch-path {
  display: grid;
  gap: 8px;
  align-content: start;
  padding: clamp(15px, 2.2vw, 22px);
  border: 1px solid var(--line-soft);
  background: rgba(7, 18, 15, .5);
  transition: border-color .18s var(--ease), background-color .18s var(--ease), transform .18s var(--ease);
}

.page-contact .ch-path:hover,
.page-contact .ch-path:focus-within {
  border-color: var(--cyan);
  background: rgba(0, 240, 192, .07);
  transform: translateY(-2px);
}

.page-contact .ch-path--main {
  border-left: 2px solid var(--orange);
}

.page-contact .ch-path__idx {
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--orange);
}

.page-contact .ch-path__title {
  margin: 0;
  font-family: var(--font-sans);
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--warm);
}

.page-contact .ch-path__use {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--body-text);
}

.page-contact .ch-path__meta {
  margin: 0;
  font-size: 12px;
  letter-spacing: .02em;
  color: var(--cyan);
  word-break: break-all;
}

@media (min-width: 760px) {
  .page-contact .ch-paths__list {
    grid-template-columns: 1fr 1fr;
  }

  .page-contact .ch-path--main {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-contact .ch-split {
    grid-template-columns: 5fr 7fr;
  }

  .page-contact .ch-rail {
    clip-path: polygon(0 0, 100% 0, calc(100% - var(--ch-cut)) 100%, 0 100%);
    padding-right: calc(clamp(24px, 4vw, 44px) + var(--ch-cut));
  }
}

@media (min-width: 1120px) {
  .page-contact .ch-paths__list {
    grid-template-columns: 2fr 1fr 1fr;
  }

  .page-contact .ch-path--main {
    grid-column: auto;
  }
}

/* ---------- 步骤流 ---------- */
.page-contact .ch-steps {
  display: grid;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-contact .ch-step {
  border-top: 1px solid var(--line-soft);
}

.page-contact .ch-step:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-contact .ch-step summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: clamp(14px, 2.4vw, 26px);
  padding: clamp(15px, 2.2vw, 22px) 0;
  cursor: pointer;
  list-style: none;
}

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

.page-contact .ch-step summary::marker {
  content: "";
}

.page-contact .ch-step summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}

.page-contact .ch-step__num {
  font-family: var(--font-display);
  font-size: clamp(26px, 4vw, 42px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: transparent;
  -webkit-text-stroke: 1.4px var(--cyan);
  min-width: 2ch;
}

.page-contact .ch-step__title {
  font-size: clamp(16px, 2.2vw, 21px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--warm);
}

.page-contact .ch-step__more {
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  color: var(--mist);
  transition: transform .18s var(--ease), color .18s var(--ease);
}

.page-contact .ch-step[open] .ch-step__more {
  color: var(--orange);
  transform: rotate(45deg);
}

.page-contact .ch-step__body {
  padding: 0 0 clamp(16px, 2.4vw, 24px) clamp(0px, 5vw, 90px);
  max-width: 74ch;
}

.page-contact .ch-step__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--body-text);
}

/* ---------- 四项信息 ---------- */
.page-contact .ch-facts__grid {
  display: grid;
  gap: 1px;
  margin-top: clamp(20px, 3vw, 30px);
  background: var(--line-faint);
  border: 1px solid var(--line-soft);
}

.page-contact .ch-fact {
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--ink);
  transition: background-color .18s var(--ease);
}

.page-contact .ch-fact:hover {
  background: var(--ink-2);
}

.page-contact .ch-fact__num {
  display: block;
  font-size: 12px;
  letter-spacing: .24em;
  color: var(--orange);
  margin-bottom: 10px;
}

.page-contact .ch-fact__title {
  margin: 0 0 8px;
  font-size: clamp(16px, 1.9vw, 19px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--warm);
}

.page-contact .ch-fact p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--body-text);
}

@media (min-width: 640px) {
  .page-contact .ch-facts__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1080px) {
  .page-contact .ch-facts__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ---------- 合作 ---------- */
.page-contact .ch-coop__panel {
  display: grid;
  gap: clamp(24px, 3.4vw, 44px);
  padding: clamp(24px, 4vw, 48px);
  border: 1px solid var(--line-soft);
  background:
    linear-gradient(150deg, rgba(0, 240, 192, .08), rgba(7, 18, 15, 0) 46%),
    var(--ink-2);
}

.page-contact .ch-coop__intro p {
  margin: 12px 0 22px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--body-text);
  max-width: 56ch;
}

.page-contact .ch-coop__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-contact .ch-coop__list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: baseline;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--line-soft);
}

.page-contact .ch-coop__list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-contact .ch-coop__list .mono {
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-contact .ch-coop__list p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--body-text);
}

.page-contact .ch-coop__list strong {
  color: var(--warm);
  font-weight: 700;
}

@media (min-width: 900px) {
  .page-contact .ch-coop__panel {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }
}

/* ---------- 回应时效 ---------- */
.page-contact .ch-tat__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-contact .ch-tat__scale {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
}

.page-contact .ch-tat__item {
  position: relative;
  padding: 4px 0 22px 24px;
  border-left: 1px solid var(--line-soft);
}

.page-contact .ch-tat__item:last-child {
  padding-bottom: 0;
}

.page-contact .ch-tat__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--cyan);
}

.page-contact .ch-tat__time {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-contact .ch-tat__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--body-text);
  max-width: 46ch;
}

.page-contact .ch-tat__note {
  margin: clamp(20px, 3vw, 28px) 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--body-text);
}

.page-contact .ch-tat__note a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-contact .ch-tat__fig {
  margin: 0;
}

@media (min-width: 860px) {
  .page-contact .ch-tat__scale {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0 clamp(12px, 1.6vw, 22px);
    border-top: 1px solid var(--line-soft);
    padding-top: 26px;
  }

  .page-contact .ch-tat__item {
    border-left: 0;
    padding: 0 clamp(8px, 1.2vw, 16px) 0 0;
  }

  .page-contact .ch-tat__item:last-child {
    padding-bottom: 0;
  }

  .page-contact .ch-tat__item::before {
    top: -31px;
    left: 0;
  }

  .page-contact .ch-tat__item p {
    font-size: 14px;
    max-width: none;
  }
}

@media (min-width: 960px) {
  .page-contact .ch-tat__grid {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }

  .page-contact .ch-tat__fig {
    position: sticky;
    top: calc(var(--header-stack) + 24px);
  }
}
<<<END>>>