.page-contact {
  --pc-cut: 18px;
  --pc-muted-light: #5b616b;
  --pc-line-light: #dee1e6;
  background: var(--carbon-black);
  color: var(--paper-white);
  overflow-x: clip;
}

.page-contact a:focus-visible,
.page-contact summary:focus-visible {
  outline: 2px solid var(--signal-orange);
  outline-offset: 2px;
}

/* ---------- 面包屑 ---------- */
.page-contact .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  padding: clamp(16px, 2.4vw, 26px) 0 0;
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--cool-gray-400);
}
.page-contact .breadcrumbs a {
  color: var(--cool-gray-400);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-contact .breadcrumbs a:hover,
.page-contact .breadcrumbs a:focus-visible {
  color: var(--signal-orange);
  border-bottom-color: var(--signal-orange);
}
.page-contact .breadcrumbs__sep { color: rgba(140, 147, 159, .5); }

/* ---------- 首屏 ---------- */
.page-contact .contact-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(24px, 4vw, 44px) 0 clamp(48px, 7vw, 86px);
}
.page-contact .contact-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(140, 147, 159, .055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(140, 147, 159, .055) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, .95), transparent 86%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, .95), transparent 86%);
}
.page-contact .contact-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  align-items: end;
}
.page-contact .contact-hero .tag { margin: 0; }
.page-contact .contact-hero h1 {
  margin: 20px 0 0;
  font-size: clamp(30px, 5.4vw, 54px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -.025em;
  text-wrap: balance;
}
.page-contact .contact-hero__lede {
  margin: 22px 0 0;
  max-width: 34em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.78;
  color: var(--cool-gray-200);
}
.page-contact .contact-hero__points {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  border-top: 1px solid var(--hairline);
}
.page-contact .contact-hero__points li {
  display: grid;
  grid-template-columns: 5em minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 11px 0;
  border-bottom: 1px solid rgba(140, 147, 159, .14);
  font-size: 13.5px;
  line-height: 1.6;
}
.page-contact .pt-key {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cool-gray-400);
}
.page-contact .pt-val { color: var(--paper-white); }
.page-contact .contact-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}
.page-contact .contact-hero__figure { margin: 0; }

/* ---------- 通用图框 ---------- */
.page-contact .media-frame {
  position: relative;
  overflow: hidden;
  background: var(--pitch-900);
  border: 1px solid var(--hairline-strong);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}
.page-contact .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-contact .media-frame::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 42%;
  height: 3px;
  background: var(--signal-orange);
}
.page-contact .contact-hero__figure .media-frame img { aspect-ratio: 2 / 1; }
.page-contact .contact-info__figure .media-frame img { aspect-ratio: 1 / 1; }
.page-contact .media-cap {
  margin-top: 13px;
  padding-left: 12px;
  border-left: 2px solid var(--orange-line);
  font-size: 12.5px;
  line-height: 1.72;
  color: var(--cool-gray-400);
}

/* ---------- 章节标题 ---------- */
.page-contact .sec-head { margin-bottom: clamp(28px, 4vw, 46px); }
.page-contact .sec-head__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(38px, 6vw, 68px);
  font-weight: 700;
  line-height: .85;
  letter-spacing: -.05em;
  color: var(--signal-orange);
  opacity: .38;
}
.page-contact .sec-head h2 {
  margin: 12px 0 0;
  font-size: clamp(23px, 3.2vw, 34px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -.02em;
}
.page-contact .sec-head p {
  margin: 10px 0 0;
  max-width: 42em;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--cool-gray-400);
}

/* ---------- 三条路径 ---------- */
.page-contact .contact-routes {
  position: relative;
  padding: clamp(46px, 6.5vw, 78px) 0 clamp(56px, 8vw, 96px);
  background: var(--pitch-900);
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}
.page-contact .contact-routes::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: clamp(72px, 20%, 280px);
  height: 3px;
  background: linear-gradient(90deg, var(--signal-orange), rgba(255, 107, 26, 0));
}
.page-contact .route-stack {
  display: grid;
  gap: 16px;
}
.page-contact .route-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(22px, 2.8vw, 30px);
  background: var(--paper-white);
  color: var(--ink-800);
  clip-path: polygon(0 0, calc(100% - var(--pc-cut)) 0, 100% var(--pc-cut), 100% 100%, 0 100%);
  filter: drop-shadow(0 14px 20px rgba(10, 11, 13, .3));
  transition: transform 200ms var(--ease), filter 200ms var(--ease);
}
.page-contact .route-card::after {
  content: "";
  position: absolute;
  top: 0;
  right: var(--pc-cut);
  width: 0;
  height: 3px;
  background: var(--signal-orange);
  transition: width 200ms var(--ease);
}
.page-contact .route-card:hover,
.page-contact .route-card:focus-within {
  transform: translateY(-5px);
  filter: drop-shadow(0 22px 28px rgba(10, 11, 13, .4));
}
.page-contact .route-card:hover::after,
.page-contact .route-card:focus-within::after {
  width: calc(100% - 42px);
}
.page-contact .route-card__index {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .18em;
  color: var(--ember-deep);
}
.page-contact .route-card__title {
  margin: 0;
  font-size: clamp(19px, 2.2vw, 22px);
  font-weight: 900;
  letter-spacing: -.01em;
  line-height: 1.25;
}
.page-contact .route-card__who {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: #565c66;
}
.page-contact .route-card__list {
  list-style: none;
  margin: 0;
  padding: 14px 0 0;
  display: grid;
  gap: 8px;
  border-top: 1px solid var(--pc-line-light);
}
.page-contact .route-card__list li {
  position: relative;
  padding-left: 16px;
  font-size: 13px;
  line-height: 1.65;
  color: #3c424b;
}
.page-contact .route-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 7px;
  height: 2px;
  background: var(--signal-orange);
}
.page-contact .route-card__foot {
  margin: auto 0 0;
  padding-top: 14px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--cool-gray-400);
}

.page-contact .route-card--teal {
  background: var(--lake-teal);
  color: var(--paper-white);
}
.page-contact .route-card--teal .route-card__index { color: rgba(20, 22, 26, .78); }
.page-contact .route-card--teal .route-card__who,
.page-contact .route-card--teal .route-card__list li { color: rgba(247, 245, 241, .93); }
.page-contact .route-card--teal .route-card__list { border-top-color: rgba(247, 245, 241, .34); }
.page-contact .route-card--teal .route-card__list li::before { background: var(--paper-white); }
.page-contact .route-card--teal .route-card__foot { color: rgba(247, 245, 241, .8); }
.page-contact .route-card--teal::after { background: var(--paper-white); }

.page-contact .route-card--pitch {
  background: var(--pitch-800);
  color: var(--paper-white);
}
.page-contact .route-card--pitch .route-card__index { color: var(--signal-orange); }
.page-contact .route-card--pitch .route-card__who,
.page-contact .route-card--pitch .route-card__list li { color: var(--cool-gray-200); }
.page-contact .route-card--pitch .route-card__list { border-top-color: var(--hairline); }
.page-contact .route-card--pitch .route-card__foot { color: var(--cool-gray-400); }

/* ---------- 联系信息 ---------- */
.page-contact .contact-info {
  background: var(--paper-white);
  color: var(--ink-800);
  padding: clamp(48px, 6.5vw, 88px) 0;
}
.page-contact .contact-info .sec-head__num { opacity: .55; }
.page-contact .contact-info .sec-head p { color: var(--pc-muted-light); }
.page-contact .contact-info__grid {
  display: grid;
  gap: clamp(26px, 3.4vw, 40px);
  align-items: start;
}
.page-contact .contact-card {
  position: relative;
  padding: clamp(24px, 3.4vw, 38px) clamp(20px, 3vw, 34px);
  background: var(--carbon-black);
  color: var(--paper-white);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
  filter: drop-shadow(0 20px 32px rgba(20, 22, 26, .3));
}
.page-contact .contact-card::before {
  content: "";
  position: absolute;
  inset: 12px;
  border: 1px solid rgba(247, 245, 241, .2);
  pointer-events: none;
}
.page-contact .contact-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 64px;
  height: 4px;
  background: var(--signal-orange);
}
.page-contact .contact-card__label {
  position: relative;
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--signal-orange);
}
.page-contact .contact-card__list {
  position: relative;
  margin: 0;
  padding: 0;
}
.page-contact .contact-card__row {
  display: grid;
  gap: 3px;
  padding: 15px 0;
  border-bottom: 1px solid rgba(140, 147, 159, .22);
}
.page-contact .contact-card__row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.page-contact .contact-card__row dt {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--cool-gray-400);
}
.page-contact .contact-card__row dd {
  margin: 0;
  font-size: clamp(14.5px, 1.7vw, 17px);
  line-height: 1.6;
  overflow-wrap: anywhere;
}
.page-contact .mono {
  font-family: var(--font-mono);
  font-weight: 600;
}
.page-contact .contact-card__note {
  position: relative;
  margin: 24px 0 0;
  padding: 12px 14px;
  border-left: 3px solid var(--signal-orange);
  background: rgba(255, 107, 26, .12);
  font-size: 13px;
  line-height: 1.72;
  color: var(--cool-gray-200);
}
.page-contact .contact-info__figure { margin: 0; }
.page-contact .contact-info__figure .media-frame { border-color: var(--pc-line-light); }
.page-contact .contact-info__figure .media-cap {
  color: var(--pc-muted-light);
  border-left-color: rgba(255, 107, 26, .65);
}

/* ---------- 邮件怎么写 ---------- */
.page-contact .contact-write {
  padding: clamp(48px, 6.5vw, 84px) 0;
  border-top: 1px solid var(--hairline);
}
.page-contact .mail-grid {
  display: grid;
  gap: 16px;
}
.page-contact .mail-card {
  position: relative;
  padding: 22px 22px 24px;
  background: var(--pitch-900);
  border: 1px solid var(--hairline);
  border-top: 3px solid var(--signal-orange);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition: transform 200ms var(--ease), border-color 200ms var(--ease);
}
.page-contact .mail-card:hover { transform: translateY(-3px); }
.page-contact .mail-card__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cool-gray-400);
}
.page-contact .mail-card h3 {
  margin: 8px 0 0;
  font-size: 18px;
  font-weight: 900;
  letter-spacing: -.01em;
  line-height: 1.3;
}
.page-contact .mail-card p {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--cool-gray-200);
}
.page-contact .mail-card .mail-card__sample {
  padding: 9px 11px;
  background: rgba(255, 107, 26, .1);
  border-left: 2px solid var(--signal-orange);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.65;
  color: var(--paper-white);
  overflow-wrap: anywhere;
}

/* ---------- 三步流程 ---------- */
.page-contact .contact-flow {
  padding: clamp(48px, 6.5vw, 84px) 0;
  background: var(--pitch-900);
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}
.page-contact .flow {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 22px;
}
.page-contact .flow__step {
  position: relative;
}
.page-contact .flow__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  margin-bottom: 14px;
  background: var(--signal-orange);
  color: var(--carbon-black);
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .02em;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  position: relative;
  z-index: 1;
}
.page-contact .flow__step h3 {
  margin: 0;
  font-size: 19px;
  font-weight: 900;
  letter-spacing: -.01em;
}
.page-contact .flow__step p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--cool-gray-200);
}
.page-contact .flow__time {
  display: inline-block;
  margin-top: 12px;
  padding: 4px 10px;
  border: 1px solid var(--orange-line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--signal-orange);
}

/* ---------- 合作方向 ---------- */
.page-contact .contact-directions {
  padding: clamp(48px, 6.5vw, 84px) 0;
  background: var(--dusk-purple);
  color: var(--paper-white);
}
.page-contact .contact-directions .sec-head__num {
  color: var(--paper-white);
  opacity: .38;
}
.page-contact .contact-directions .sec-head p { color: rgba(247, 245, 241, .84); }
.page-contact .dir-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-contact .dir-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 14px;
  padding: 18px 20px;
  background: rgba(20, 22, 26, .26);
  border: 1px solid rgba(247, 245, 241, .2);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
  transition: background-color 180ms var(--ease), transform 180ms var(--ease);
}
.page-contact .dir-item:hover {
  background: rgba(20, 22, 26, .42);
  transform: translateY(-2px);
}
.page-contact .dir-item__idx {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .16em;
  color: var(--signal-orange);
  align-self: center;
}
.page-contact .dir-item h3 {
  margin: 0;
  font-size: 16.5px;
  font-weight: 900;
  letter-spacing: -.01em;
  line-height: 1.4;
}
.page-contact .dir-item p {
  grid-column: 1 / -1;
  margin: 6px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(247, 245, 241, .86);
}

/* ---------- 延伸入口 ---------- */
.page-contact .contact-more {
  padding: clamp(40px, 5.5vw, 72px) 0 clamp(48px, 6.5vw, 88px);
  border-top: 1px solid var(--hairline);
}
.page-contact .contact-more__inner {
  display: grid;
  gap: 18px;
  align-items: center;
}
.page-contact .contact-more__lede {
  margin: 0;
  font-size: clamp(15px, 1.8vw, 18px);
  line-height: 1.7;
  color: var(--cool-gray-200);
}
.page-contact .contact-more__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-contact .contact-more__links a {
  display: inline-flex;
  align-items: center;
  padding: 10px 16px;
  font-size: 13px;
  font-weight: 600;
  color: var(--paper-white);
  text-decoration: none;
  background: var(--pitch-900);
  border: 1px solid var(--hairline-strong);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.page-contact .contact-more__links a:hover,
.page-contact .contact-more__links a:focus-visible {
  color: var(--signal-orange);
  border-color: var(--signal-orange);
  background: rgba(255, 107, 26, .08);
}

/* ---------- 响应式 ---------- */
@media (min-width: 520px) {
  .page-contact .contact-card__row {
    grid-template-columns: 6.2em minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }
}

@media (min-width: 760px) {
  .page-contact .flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }
  .page-contact .flow::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 26px;
    height: 2px;
    background: linear-gradient(90deg, var(--signal-orange), rgba(255, 107, 26, .16));
  }
  .page-contact .flow__step { padding-right: 26px; }
  .page-contact .flow__step + .flow__step { padding-left: 26px; }
  .page-contact .contact-more__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 32px;
  }
}

@media (min-width: 780px) {
  .page-contact .dir-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 820px) {
  .page-contact .mail-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (min-width: 880px) {
  .page-contact .route-stack {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
    align-items: start;
  }
  .page-contact .route-card:nth-child(2) { margin-top: 46px; }
  .page-contact .route-card:nth-child(3) { margin-top: 92px; }
}

@media (min-width: 900px) {
  .page-contact .contact-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (min-width: 920px) {
  .page-contact .contact-info__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .route-card,
  .page-contact .mail-card,
  .page-contact .dir-item,
  .page-contact .contact-more__links a,
  .page-contact .route-card::after {
    transition: none;
  }
  .page-contact .route-card:hover,
  .page-contact .route-card:focus-within,
  .page-contact .mail-card:hover,
  .page-contact .dir-item:hover {
    transform: none;
  }
}
<<<END>>>