/* ===== 合作与联系 / page-contact ===== */
.page-contact {
  background: var(--c-cloud);
  color: var(--c-deep);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-contact .co-hero {
  padding-block: clamp(1.6rem, 4.8vw, 3rem) clamp(2rem, 5.5vw, 3.6rem);
  border-bottom: 1px solid var(--line);
  position: relative;
}

.page-contact .co-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: clamp(64px, 14vw, 132px);
  height: 3px;
  background: var(--c-signal);
}

.page-contact .co-hero h1 {
  margin: .7rem 0 0;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(2.05rem, 7vw, 4.4rem);
  line-height: 1.03;
  letter-spacing: -.015em;
}

.page-contact .co-hero__lead {
  margin: 1.2rem 0 0;
  max-width: 34em;
  font-size: clamp(.98rem, .93rem + .35vw, 1.12rem);
  line-height: 1.85;
  color: var(--c-night);
}

.page-contact .co-hero__actions {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin: 1.6rem 0 0;
  padding: 0;
}

/* ---------- 通用章节 ---------- */
.page-contact .co-section {
  padding-block: clamp(2rem, 5.2vw, 3.6rem);
  border-bottom: 1px solid var(--line);
}

.page-contact .co-section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .5rem 1.1rem;
  margin-bottom: clamp(1.2rem, 3vw, 1.9rem);
}

.page-contact h2 {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(1.55rem, 3.6vw, 2.5rem);
  line-height: 1.16;
  letter-spacing: -.01em;
}

.page-contact .co-section__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--c-slate);
}

/* ---------- 合作类型切换 ---------- */
.page-contact .co-types {
  position: relative;
}

.page-contact .co-types__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  clip-path: inset(50%);
  overflow: hidden;
  white-space: nowrap;
}

.page-contact .co-types__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 1.1rem;
}

.page-contact .co-types__tab {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  padding: .6rem 1rem;
  border: 1px solid var(--c-mist);
  background: transparent;
  color: var(--c-deep);
  font-size: .9rem;
  font-weight: 600;
  line-height: 1.2;
  cursor: pointer;
  transition: background var(--fast) var(--ease), color var(--fast) var(--ease),
    border-color var(--fast) var(--ease);
}

.page-contact .co-types__tab::before {
  content: "";
  width: 6px;
  height: 6px;
  flex: none;
  background: var(--c-mist);
  transition: background var(--fast) var(--ease);
}

.page-contact .co-types__tab:hover {
  border-color: var(--c-deep);
}

.page-contact .co-types__radio:nth-of-type(1):checked ~ .co-types__tabs .co-types__tab:nth-of-type(1),
.page-contact .co-types__radio:nth-of-type(2):checked ~ .co-types__tabs .co-types__tab:nth-of-type(2),
.page-contact .co-types__radio:nth-of-type(3):checked ~ .co-types__tabs .co-types__tab:nth-of-type(3),
.page-contact .co-types__radio:nth-of-type(4):checked ~ .co-types__tabs .co-types__tab:nth-of-type(4) {
  background: var(--c-deep);
  border-color: var(--c-deep);
  color: var(--c-cloud);
}

.page-contact .co-types__radio:nth-of-type(1):checked ~ .co-types__tabs .co-types__tab:nth-of-type(1)::before,
.page-contact .co-types__radio:nth-of-type(2):checked ~ .co-types__tabs .co-types__tab:nth-of-type(2)::before,
.page-contact .co-types__radio:nth-of-type(3):checked ~ .co-types__tabs .co-types__tab:nth-of-type(3)::before,
.page-contact .co-types__radio:nth-of-type(4):checked ~ .co-types__tabs .co-types__tab:nth-of-type(4)::before {
  background: var(--c-signal);
}

.page-contact .co-types__radio:nth-of-type(1):focus-visible ~ .co-types__tabs .co-types__tab:nth-of-type(1),
.page-contact .co-types__radio:nth-of-type(2):focus-visible ~ .co-types__tabs .co-types__tab:nth-of-type(2),
.page-contact .co-types__radio:nth-of-type(3):focus-visible ~ .co-types__tabs .co-types__tab:nth-of-type(3),
.page-contact .co-types__radio:nth-of-type(4):focus-visible ~ .co-types__tabs .co-types__tab:nth-of-type(4) {
  outline: 2px solid var(--c-signal);
  outline-offset: 2px;
}

.page-contact .co-types__panel {
  display: none;
}

.page-contact .co-types__radio:nth-of-type(1):checked ~ .co-types__panels .co-types__panel:nth-of-type(1),
.page-contact .co-types__radio:nth-of-type(2):checked ~ .co-types__panels .co-types__panel:nth-of-type(2),
.page-contact .co-types__radio:nth-of-type(3):checked ~ .co-types__panels .co-types__panel:nth-of-type(3),
.page-contact .co-types__radio:nth-of-type(4):checked ~ .co-types__panels .co-types__panel:nth-of-type(4) {
  display: grid;
  animation: coFade var(--slow) var(--ease) both;
}

.page-contact .co-types__panel {
  gap: 1.2rem;
  padding: clamp(1.05rem, 3vw, 1.7rem);
  background: var(--c-paper);
  border-left: 4px solid var(--c-signal);
}

.page-contact .co-panel__title {
  margin: 0 0 .55rem;
  font-size: 1.12rem;
  font-weight: 700;
  line-height: 1.35;
}

.page-contact .co-panel__text {
  margin: 0;
  font-size: .93rem;
  line-height: 1.85;
  color: var(--c-night);
}

.page-contact .co-panel__kicker {
  margin: 0 0 .6rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .13em;
  color: var(--c-slate);
}

.page-contact .co-panel__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .55rem;
}

.page-contact .co-panel__list li {
  position: relative;
  padding-left: 1.05rem;
  font-size: .88rem;
  line-height: 1.72;
  color: var(--c-night);
}

.page-contact .co-panel__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .66em;
  width: .52rem;
  height: 2px;
  background: var(--c-signal);
}

/* ---------- 合作流程 ---------- */
.page-contact .co-flow {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(1.3rem, 4vw, 2.6rem);
  background: var(--c-abyss);
  color: var(--c-cloud);
}

.page-contact .co-flow__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  margin: 0;
}

.page-contact .co-flow__bg img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  opacity: .5;
}

.page-contact .co-flow__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(200deg, rgba(7, 20, 31, .62) 0%, rgba(7, 20, 31, .94) 68%);
}

.page-contact .co-flow__rail {
  display: none;
}

.page-contact .co-flow__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.15rem;
}

.page-contact .co-flow__step {
  padding-top: .85rem;
  border-top: 1px solid var(--line-dark);
}

.page-contact .co-flow__num {
  display: block;
  margin-bottom: .35rem;
  font-family: var(--font-mono);
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--c-signal);
}

.page-contact .co-flow__step h3 {
  margin: 0 0 .4rem;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--c-cloud);
}

.page-contact .co-flow__step p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.8;
  color: var(--c-mist);
}

/* ---------- 纠错与文档建议 ---------- */
.page-contact .co-fix__grid {
  display: grid;
  gap: 1.1rem;
}

.page-contact .co-fix__card {
  display: grid;
  align-content: start;
  gap: .65rem;
  padding: clamp(1.05rem, 3vw, 1.6rem);
}

.page-contact .co-fix__card h3 {
  margin: 0;
  font-size: 1.06rem;
  font-weight: 700;
  line-height: 1.4;
}

.page-contact .co-fix__card p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--c-night);
}

.page-contact .co-fix__mail {
  font-family: var(--font-mono);
  font-size: .84rem;
  font-weight: 600;
  color: var(--c-deep);
  text-decoration: none;
  word-break: break-all;
  border-bottom: 1px solid var(--c-signal);
  justify-self: start;
  transition: color var(--fast) var(--ease);
}

.page-contact .co-fix__mail:hover {
  color: var(--c-signal);
}

.page-contact .co-fix__turn {
  font-family: var(--font-mono);
  font-size: .76rem;
  color: var(--c-slate);
}

.page-contact .co-fix__foot {
  margin: 1.1rem 0 0;
  font-size: .86rem;
  line-height: 1.8;
  color: var(--c-night);
}

.page-contact .co-fix__foot a {
  color: var(--c-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--c-signal);
}

.page-contact .co-fix__foot a:hover {
  color: var(--c-signal);
}

/* ---------- 响应时间 ---------- */
.page-contact .co-response__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-contact .co-response__row {
  display: grid;
  gap: .25rem;
  padding-block: .95rem;
  border-top: 1px solid var(--line);
  align-items: baseline;
}

.page-contact .co-response__row:last-child {
  border-bottom: 1px solid var(--line);
}

.page-contact .co-response__topic {
  font-family: var(--font-mono);
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--c-deep);
}

.page-contact .co-response__win {
  font-size: .92rem;
  line-height: 1.65;
  color: var(--c-night);
}

.page-contact .co-response__mail {
  font-family: var(--font-mono);
  font-size: .82rem;
  font-weight: 600;
  color: var(--c-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--c-cyan);
  justify-self: start;
  transition: color var(--fast) var(--ease), border-color var(--fast) var(--ease);
}

.page-contact .co-response__mail:hover {
  color: var(--c-signal);
  border-color: var(--c-signal);
}

/* ---------- 联系板 ---------- */
.page-contact .co-contact {
  background: var(--c-abyss);
  color: var(--c-cloud);
  padding-block: clamp(2.4rem, 6vw, 4.4rem);
  position: relative;
}

.page-contact .co-contact::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--c-signal) 0%, var(--c-signal) 18%, var(--c-night) 18%, var(--c-night) 100%);
}

.page-contact .co-contact h2 {
  color: var(--c-cloud);
  max-width: 20em;
}

.page-contact .co-contact__lead {
  margin: .9rem 0 0;
  max-width: 34em;
  font-size: .96rem;
  line-height: 1.85;
  color: var(--c-mist);
}

.page-contact .co-contact__grid {
  display: grid;
  gap: 1.9rem;
  margin-top: clamp(1.4rem, 3.5vw, 2.2rem);
}

.page-contact .co-channel {
  padding-block: .95rem;
  border-top: 1px solid var(--line-dark);
}

.page-contact .co-channel:last-of-type {
  border-bottom: 1px solid var(--line-dark);
}

.page-contact .co-channel__label {
  margin: 0 0 .35rem;
  font-family: var(--font-mono);
  font-size: .71rem;
  letter-spacing: .13em;
  color: var(--c-cyan);
}

.page-contact .co-channel__mail {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(.88rem, 1.6vw, 1.1rem);
  font-weight: 600;
  color: var(--c-cloud);
  text-decoration: none;
  word-break: break-all;
  border-bottom: 1px solid rgba(244, 247, 249, .3);
  transition: color var(--fast) var(--ease), border-color var(--fast) var(--ease);
}

.page-contact .co-channel__mail:hover {
  color: var(--c-signal);
  border-color: var(--c-signal);
}

.page-contact .co-channel__desc {
  margin: .45rem 0 0;
  font-size: .84rem;
  line-height: 1.75;
  color: var(--c-mist);
}

.page-contact .co-tel {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .55rem 1rem;
  margin-top: 1.3rem;
  padding: .85rem 1.05rem;
  background: var(--c-night);
  border-left: 3px solid var(--c-signal);
}

.page-contact .co-tel__k {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .13em;
  color: var(--c-cyan);
}

.page-contact .co-tel__v {
  font-family: var(--font-mono);
  font-size: clamp(1.1rem, 2.4vw, 1.32rem);
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--c-cloud);
  text-decoration: none;
  transition: color var(--fast) var(--ease);
}

.page-contact .co-tel__v:hover {
  color: var(--c-signal);
}

.page-contact .co-meta {
  display: grid;
  gap: .85rem;
  margin-top: 1.4rem;
}

.page-contact .co-meta__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .45rem .8rem;
}

.page-contact .co-meta__addr {
  font-size: .9rem;
  line-height: 1.7;
  color: var(--c-cloud);
}

.page-contact .co-meta__icp {
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .03em;
  color: var(--c-mist);
}

.page-contact .co-contact__figure {
  margin: 0;
}

.page-contact .co-contact__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid rgba(127, 212, 217, .25);
}

.page-contact .co-contact__figure figcaption {
  margin-top: .55rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .05em;
  color: var(--c-mist);
}

.page-contact .co-contact__foot {
  margin: clamp(1.6rem, 4vw, 2.4rem) 0 0;
  font-size: .86rem;
  line-height: 1.85;
  color: var(--c-mist);
}

.page-contact .co-contact__foot a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(127, 212, 217, .45);
  transition: color var(--fast) var(--ease);
}

.page-contact .co-contact__foot a:hover {
  color: var(--c-signal);
  border-color: var(--c-signal);
}

@keyframes coFade {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- 中等屏 ---------- */
@media (min-width: 640px) {
  .page-contact .co-fix__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.25rem;
  }

  .page-contact .co-response__row {
    grid-template-columns: 9.5rem minmax(0, 1fr);
    gap: .3rem 1.2rem;
  }

  .page-contact .co-response__mail {
    grid-column: 2;
  }
}

/* ---------- 桌面端 ---------- */
@media (min-width: 860px) {
  .page-contact .co-types__panel {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 2.2rem;
    padding-inline: clamp(1.5rem, 3vw, 2.2rem);
  }

  .page-contact .co-flow__rail {
    display: block;
    margin-bottom: -.4rem;
  }

  .page-contact .co-flow__rail svg {
    display: block;
    width: 100%;
    height: 72px;
    overflow: visible;
  }

  .page-contact .co-flow__rail polyline {
    fill: none;
    stroke: var(--c-signal);
    stroke-width: 2;
    stroke-linecap: round;
  }

  .page-contact .co-flow__rail circle {
    fill: var(--c-signal);
  }

  .page-contact .co-flow__steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.5rem;
  }
}

@media (min-width: 1000px) {
  .page-contact .co-response__row {
    grid-template-columns: 11rem minmax(0, 1fr) auto;
    gap: .3rem 1.6rem;
  }

  .page-contact .co-response__mail {
    grid-column: 3;
    justify-self: end;
  }

  .page-contact .co-contact__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: 3rem;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .co-types__radio:nth-of-type(1):checked ~ .co-types__panels .co-types__panel:nth-of-type(1),
  .page-contact .co-types__radio:nth-of-type(2):checked ~ .co-types__panels .co-types__panel:nth-of-type(2),
  .page-contact .co-types__radio:nth-of-type(3):checked ~ .co-types__panels .co-types__panel:nth-of-type(3),
  .page-contact .co-types__radio:nth-of-type(4):checked ~ .co-types__panels .co-types__panel:nth-of-type(4) {
    animation: none;
  }

  .page-contact .co-types__tab,
  .page-contact .co-channel__mail,
  .page-contact .co-tel__v,
  .page-contact .co-response__mail,
  .page-contact .co-fix__mail {
    transition: none;
  }
}
<<<PAGE_CSS_END>>>