.page-contact {
  --pc-border: 2px;
  --pc-shadow: 5px 5px 0 rgba(0, 0, 0, .55);
  --pc-shadow-flip: -5px 5px 0 rgba(0, 0, 0, .55);
}

/* ---------- 首屏 ---------- */
.page-contact .contact-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  border-bottom: var(--pc-border) solid var(--rock);
}

.page-contact .contact-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-contact .contact-hero__media img {
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  object-position: center 42%;
  filter: grayscale(.45) contrast(1.18) brightness(.52);
  opacity: .5;
}

.page-contact .contact-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(180deg, rgba(14, 16, 19, .74) 0%, rgba(14, 16, 19, .93) 60%, var(--ink) 100%);
}

.page-contact .contact-hero__inner {
  position: relative;
  z-index: 2;
  padding-top: clamp(70px, 12vw, 164px);
  padding-bottom: clamp(44px, 7vw, 96px);
}

.page-contact .contact-hero .breadcrumb {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--c-dim);
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-contact .contact-hero .breadcrumb a {
  color: var(--c-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-contact .contact-hero .breadcrumb a:hover {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-contact .contact-hero .breadcrumb__sep {
  margin: 0 .5em;
  color: var(--rock-lt);
}

.page-contact .sec-num {
  font-family: var(--font-mono);
  font-size: .76rem;
  font-weight: 500;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ochre-lt);
  margin: 0 0 14px;
}

.page-contact .contact-hero h1 {
  margin: 0;
  font-size: clamp(2rem, 5.4vw, 4.1rem);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--c-text);
  max-width: 17ch;
}

.page-contact .contact-hero__lede {
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  max-width: 62ch;
  font-size: clamp(.96rem, 1.35vw, 1.1rem);
  line-height: 1.72;
  color: var(--c-dim);
}

/* ---------- 公共章节头 ---------- */
.page-contact .contact-head {
  display: grid;
  gap: 12px;
  margin-bottom: clamp(28px, 4.4vw, 52px);
}

.page-contact .contact-head h2 {
  margin: 0;
  font-size: clamp(1.7rem, 3.4vw, 2.8rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--c-text);
  max-width: 20ch;
}

.page-contact .contact-head__note {
  margin: 0;
  font-size: .86rem;
  line-height: 1.7;
  color: var(--c-dim);
  max-width: 52ch;
}

.page-contact .contact-head__note a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid var(--hair);
}

.page-contact .contact-head__note a:hover {
  border-bottom-color: var(--lime);
}

@media (min-width: 900px) {
  .page-contact .contact-head {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: end;
    column-gap: 48px;
  }
  .page-contact .contact-head .sec-num {
    grid-column: 1 / -1;
    margin-bottom: 4px;
  }
  .page-contact .contact-head h2 {
    grid-column: 1;
  }
  .page-contact .contact-head__note {
    grid-column: 2;
    padding-bottom: .4em;
  }
}

/* ---------- 01 通道板 ---------- */
.page-contact .channel-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.page-contact .channel-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: clamp(20px, 2.4vw, 30px);
  background: var(--ink-2);
  border: var(--pc-border) solid var(--rock);
  box-shadow: var(--pc-shadow);
  transition: border-color .22s var(--ease), box-shadow .22s var(--ease);
}

.page-contact .channel-card:hover {
  border-color: var(--ochre);
  box-shadow: var(--pc-shadow-flip);
}

.page-contact .channel-card--focal {
  background: var(--indigo);
  border-color: var(--ochre);
}

.page-contact .channel-card--focal:hover {
  border-color: var(--lime);
}

.page-contact .channel-card__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ochre-lt);
}

.page-contact .channel-card h3 {
  margin: 0;
  font-size: clamp(1.15rem, 1.9vw, 1.5rem);
  font-weight: 800;
  line-height: 1.22;
  color: var(--c-text);
}

.page-contact .channel-card > p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.68;
  color: var(--c-dim);
  max-width: 44ch;
}

.page-contact .channel-card__hint {
  font-size: .82rem !important;
}

.page-contact .channel-card__hint a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(198, 242, 78, .4);
}

.page-contact .channel-card__hint a:hover {
  border-bottom-color: var(--lime);
}

.page-contact .channel-card .btn {
  align-self: flex-start;
  margin-top: auto;
}

.page-contact .channel-card__more {
  border-top: 1px dashed var(--hair);
  padding-top: 13px;
}

.page-contact .channel-card__more summary {
  display: flex;
  align-items: center;
  gap: 9px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .09em;
  color: var(--lime);
}

.page-contact .channel-card__more summary::-webkit-details-marker {
  display: none;
}

.page-contact .channel-card__more summary::before {
  content: "+";
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
  line-height: 13px;
  text-align: center;
  border: 1px solid currentColor;
  font-size: .68rem;
}

.page-contact .channel-card__more[open] summary::before {
  content: "–";
}

.page-contact .channel-card__more ul {
  margin: 12px 0 0;
  padding-left: 17px;
  display: grid;
  gap: 7px;
}

.page-contact .channel-card__more li {
  font-size: .84rem;
  line-height: 1.58;
  color: var(--c-dim);
}

.page-contact .contact-dl {
  margin: 2px 0 0;
  display: grid;
  gap: 1px;
  background: var(--hair);
  border: 1px solid var(--hair);
}

.page-contact .contact-dl > div {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 12px;
  padding: 12px 14px;
  background: var(--indigo);
}

.page-contact .contact-dl dt {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--ochre-lt);
  align-self: center;
}

.page-contact .contact-dl dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(.82rem, 1.7vw, .98rem);
  font-weight: 500;
  color: var(--c-text);
  word-break: break-word;
  overflow-wrap: anywhere;
}

@media (min-width: 960px) {
  .page-contact .channel-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    align-items: start;
    column-gap: 24px;
    row-gap: 24px;
  }
  .page-contact .channel-grid > :nth-child(1) {
    grid-column: span 3;
    margin-top: 0;
  }
  .page-contact .channel-grid > :nth-child(2) {
    grid-column: span 6;
    margin-top: 28px;
  }
  .page-contact .channel-grid > :nth-child(3) {
    grid-column: span 3;
    margin-top: 58px;
  }
}

/* ---------- 02 内容合作 ---------- */
.page-contact .coop-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 5vw, 56px);
}

.page-contact .coop-lede {
  margin: 0;
  max-width: 56ch;
  font-size: .94rem;
  line-height: 1.74;
  color: var(--c-dim);
}

.page-contact .coop-copy h2 {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  font-size: clamp(1.6rem, 3.1vw, 2.5rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.015em;
  color: var(--c-text);
  max-width: 20ch;
}

.page-contact .coop-copy .sec-num {
  margin-bottom: 12px;
}

.page-contact .coop-steps {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  gap: 24px;
}

.page-contact .coop-steps > li {
  position: relative;
  padding-left: 58px;
  border-left: 1px solid var(--hair);
  padding-bottom: 4px;
}

.page-contact .coop-steps__n {
  position: absolute;
  left: 14px;
  top: -10px;
  font-family: var(--font-mono);
  font-size: 2.4rem;
  font-weight: 700;
  line-height: 1;
  color: var(--ochre);
}

.page-contact .coop-steps h3 {
  margin: 0 0 7px;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--c-text);
}

.page-contact .coop-steps p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.68;
  color: var(--c-dim);
  max-width: 48ch;
}

.page-contact .coop-figure {
  margin: 0;
}

.page-contact .coop-figure .img-frame {
  border: var(--pc-border) solid var(--rock);
  box-shadow: var(--pc-shadow);
}

.page-contact .coop-figure figcaption {
  margin-top: 16px;
  padding-left: 14px;
  border-left: 3px solid var(--ochre);
  font-size: .83rem;
  line-height: 1.62;
  color: var(--c-dim);
}

@media (min-width: 900px) {
  .page-contact .coop-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    column-gap: clamp(32px, 5vw, 64px);
  }
  .page-contact .coop-figure {
    position: sticky;
    top: 96px;
  }
}

/* ---------- 03 引用与更正 ---------- */
.page-contact .rights-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.page-contact .rights-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: clamp(20px, 2.6vw, 32px);
  background: var(--ink-2);
  border: var(--pc-border) solid var(--rock);
  border-left: 6px solid var(--ochre);
}

.page-contact .rights-card h3 {
  margin: 0;
  font-size: clamp(1.08rem, 1.8vw, 1.36rem);
  font-weight: 800;
  line-height: 1.26;
  color: var(--c-text);
}

.page-contact .rights-card > p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.7;
  color: var(--c-dim);
  max-width: 52ch;
}

.page-contact .rights-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-contact .rights-list li {
  position: relative;
  padding-left: 20px;
  font-size: .86rem;
  line-height: 1.6;
  color: var(--c-dim);
}

.page-contact .rights-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 9px;
  height: 2px;
  background: var(--lime);
}

.page-contact .rights-list a {
  color: var(--c-text);
  text-decoration: none;
  border-bottom: 1px solid var(--hair);
}

.page-contact .rights-list a:hover {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

@media (min-width: 860px) {
  .page-contact .rights-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px;
  }
}

/* ---------- 04 响应节奏 ---------- */
.page-contact .sla-track {
  list-style: none;
  margin: clamp(26px, 4vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  position: relative;
}

.page-contact .sla-node {
  position: relative;
  padding-top: 34px;
}

.page-contact .sla-node__dot {
  position: absolute;
  top: 0;
  left: 0;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--pine);
  border: 3px solid var(--ochre);
  transition: background .2s var(--ease), border-color .2s var(--ease);
}

.page-contact .sla-node__time {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--ochre-lt);
}

.page-contact .sla-node h3 {
  margin: 0 0 8px;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--c-text);
  transition: color .2s var(--ease);
}

.page-contact .sla-node p:not(.sla-node__time) {
  margin: 0;
  font-size: .86rem;
  line-height: 1.66;
  color: var(--c-dim);
  max-width: 34ch;
}

.page-contact .sla-node:hover .sla-node__dot {
  background: var(--lime);
  border-color: var(--lime);
}

.page-contact .sla-node:hover h3 {
  color: var(--lime);
}

@media (min-width: 760px) {
  .page-contact .sla-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    column-gap: 26px;
    row-gap: 0;
  }
  .page-contact .sla-track::before {
    content: "";
    position: absolute;
    left: 0;
    right: 26px;
    top: 6px;
    height: 2px;
    background: var(--rock);
    z-index: 0;
  }
  .page-contact .sla-node {
    padding-top: 36px;
    padding-right: 12px;
  }
}

/* ---------- 底部信息带 ---------- */
.page-contact .contact-band {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 26px;
  justify-content: space-between;
  align-items: center;
  padding-top: 20px;
  padding-bottom: 28px;
  border-top: 1px solid var(--hair);
  font-family: var(--font-mono);
  font-size: .73rem;
  letter-spacing: .08em;
  color: var(--c-dim);
}

.page-contact .contact-band p {
  margin: 0;
}