.page-contact {
  --co-line: rgba(140, 154, 171, 0.20);
  --co-mesh: rgba(55, 226, 213, 0.07);
  --co-paper-line: rgba(35, 42, 51, 0.16);
  background: var(--ink-900);
  color: var(--paper);
  overflow-x: hidden;
}

.page-contact .co-kicker {
  margin: 0 0 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.page-contact .co-kicker::before {
  content: "";
  flex: 0 0 26px;
  height: 1px;
  background: currentColor;
}

.page-contact .co-kicker--paper {
  color: var(--cyan-deep);
}

.page-contact .co-h2 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.65rem, 5vw, 2.6rem);
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-contact .co-h2--paper {
  color: var(--paper-ink);
}

.page-contact .co-head {
  max-width: 64ch;
  margin: 0 0 clamp(1.8rem, 4vw, 2.8rem);
}

.page-contact .co-head--tight {
  margin-bottom: clamp(1.4rem, 3vw, 2rem);
}

.page-contact .co-head__lede {
  margin: 0;
  font-size: 1.0625rem;
  line-height: 1.9;
  color: var(--text-soft);
  max-width: 62ch;
}

.page-contact .co-head__lede--paper {
  color: rgba(35, 42, 51, 0.78);
}

/* ---------- 首屏 ---------- */

.page-contact .co-open {
  padding: clamp(0.5rem, 2vw, 1.2rem) 0 clamp(2.4rem, 6vw, 4.2rem);
  background:
    radial-gradient(120% 90% at 78% 8%, rgba(26, 18, 48, 0.85) 0%, rgba(7, 26, 46, 0) 62%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 100%);
}

.page-contact .co-open__grid {
  display: grid;
  gap: clamp(1.6rem, 4vw, 3rem);
}

.page-contact .co-open__h1 {
  margin: 0 0 1.2rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.05rem, 7.4vw, 4.35rem);
  line-height: 1.04;
  letter-spacing: -0.025em;
  color: var(--paper);
  text-wrap: balance;
}

.page-contact .co-open__lede {
  margin: 0 0 1rem;
  max-width: 58ch;
  font-size: 1.0625rem;
  line-height: 1.9;
  color: var(--text-soft);
}

.page-contact .co-open__note {
  margin: 0;
  padding-left: 0.9rem;
  border-left: 2px solid var(--red);
  font-family: var(--font-mono);
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-contact .co-open__lanes {
  display: grid;
  gap: 0.35rem;
  align-content: end;
}

.page-contact .co-lane {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-rows: auto auto;
  gap: 0.2rem 0.9rem;
  padding: 0.85rem 1rem;
  border-left: 2px solid var(--line-cyan);
  color: inherit;
  text-decoration: none;
  transition: background-color 0.25s var(--ease), border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-contact .co-lane:hover,
.page-contact .co-lane:focus-visible {
  background: rgba(55, 226, 213, 0.07);
  border-left-color: var(--cyan);
  transform: translateX(4px);
}

.page-contact .co-lane__no {
  grid-row: 1 / span 2;
  align-self: start;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--cyan);
  padding-top: 0.2rem;
}

.page-contact .co-lane__t {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--paper);
}

.page-contact .co-lane__d {
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--text-dim);
}

/* ---------- 图片 ---------- */

.page-contact .co-figure {
  position: relative;
  margin: 0 0 clamp(1.8rem, 4vw, 2.8rem);
  overflow: hidden;
  border-radius: var(--radius);
  background: linear-gradient(160deg, var(--ink-700), var(--ink-950));
}

.page-contact .co-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.02);
}

.page-contact .co-figure figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 0.85rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--paper);
  background: linear-gradient(180deg, rgba(7, 26, 46, 0) 0%, rgba(7, 26, 46, 0.92) 70%);
}

/* ---------- 合作方向 ---------- */

.page-contact .co-dirs {
  padding: clamp(2.4rem, 6vw, 4.2rem) 0;
  background: var(--ink-900);
}

.page-contact .co-dir-grid {
  display: grid;
  gap: 1px;
  background: var(--co-line);
  border-top: 1px solid var(--co-line);
  border-bottom: 1px solid var(--co-line);
}

.page-contact .co-dir {
  position: relative;
  padding: clamp(1.4rem, 3.5vw, 2.2rem) clamp(1rem, 2.5vw, 1.6rem);
  background: var(--ink-900);
  transition: background-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-contact .co-dir::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 3px;
  background: var(--cyan);
  transition: width 0.35s var(--ease);
}

.page-contact .co-dir:hover::after,
.page-contact .co-dir:focus-within::after {
  width: 42%;
}

.page-contact .co-dir:hover,
.page-contact .co-dir:focus-within {
  background: var(--ink-700);
}

.page-contact .co-dir__no {
  display: block;
  margin-bottom: 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  color: var(--green);
}

.page-contact .co-dir__t {
  margin: 0 0 0.8rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.15rem, 3vw, 1.4rem);
  line-height: 1.3;
  color: var(--paper);
}

.page-contact .co-dir__p {
  margin: 0 0 1rem;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-contact .co-dir__fit {
  margin: 0;
  padding-top: 0.8rem;
  border-top: 1px dashed var(--co-line);
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--text-dim);
  opacity: 0.72;
  transition: opacity 0.3s var(--ease), color 0.3s var(--ease);
}

.page-contact .co-dir:hover .co-dir__fit,
.page-contact .co-dir:focus-within .co-dir__fit {
  opacity: 1;
  color: var(--cyan);
}

.page-contact .co-dir__fit-k {
  display: inline-block;
  margin-right: 0.5rem;
  padding: 0.05rem 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--ink-900);
  background: var(--green);
}

/* ---------- 对接流程 ---------- */

.page-contact .co-flow {
  padding: clamp(2.4rem, 6vw, 4.5rem) 0;
  background:
    linear-gradient(180deg, var(--ink-800) 0%, var(--ink-900) 100%);
  background-image:
    linear-gradient(180deg, var(--ink-800) 0%, var(--ink-900) 100%),
    repeating-linear-gradient(56deg, var(--co-mesh) 0 1px, transparent 1px 56px);
}

.page-contact .co-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  counter-reset: none;
}

.page-contact .co-step {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1rem;
  padding: 1.3rem 0 1.3rem 0;
  border-top: 1px solid var(--co-line);
  transition: background-color 0.3s var(--ease);
}

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

.page-contact .co-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: -1px;
  width: 0;
  height: 2px;
  background: var(--green);
  transition: width 0.4s var(--ease);
}

.page-contact .co-step:hover::before,
.page-contact .co-step.is-active::before,
.page-contact .co-step:focus-within::before {
  width: 100%;
}

.page-contact .co-step__no {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  color: var(--dust);
  padding-top: 0.25rem;
  transition: color 0.3s var(--ease);
}

.page-contact .co-step.is-active .co-step__no,
.page-contact .co-step:hover .co-step__no {
  color: var(--green);
}

.page-contact .co-step__t {
  margin: 0 0 0.55rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.1rem, 3vw, 1.32rem);
  line-height: 1.3;
  color: var(--paper);
}

.page-contact .co-step__p {
  margin: 0 0 0.7rem;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--text-soft);
  max-width: 58ch;
}

.page-contact .co-step__need {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-contact .co-step__need span {
  display: inline-block;
  margin-right: 0.5rem;
  padding: 0.05rem 0.42rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
  border: 1px solid var(--line-cyan);
}

/* ---------- 联系方式 ---------- */

.page-contact .co-contact {
  position: relative;
  overflow: hidden;
  padding: clamp(2.6rem, 6.5vw, 4.6rem) 0;
  background:
    radial-gradient(120% 110% at 82% 0%, #12294a 0%, rgba(7, 26, 46, 0) 62%),
    var(--ink-900);
}

.page-contact .co-contact__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.26;
  pointer-events: none;
}

.page-contact .co-contact__inner {
  position: relative;
  z-index: 1;
}

.page-contact .co-channels {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--co-line);
  border: 1px solid var(--co-line);
}

.page-contact .co-channel {
  display: grid;
  gap: 0.35rem;
  padding: clamp(1.1rem, 3vw, 1.6rem);
  background: rgba(11, 34, 56, 0.86);
  transition: background-color 0.3s var(--ease);
}

.page-contact .co-channel:hover,
.page-contact .co-channel:focus-within {
  background: rgba(15, 44, 72, 0.94);
}

.page-contact .co-channel__k {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--dust);
}

.page-contact .co-channel__v {
  font-family: var(--font-mono);
  font-size: clamp(1rem, 3.4vw, 1.35rem);
  font-weight: 500;
  line-height: 1.45;
  color: var(--paper);
  word-break: break-word;
}

.page-contact .co-channel__v--num {
  color: var(--green);
  letter-spacing: 0.04em;
}

.page-contact .co-channel__meta {
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-contact .co-channel__btn {
  justify-self: start;
  margin-top: 0.45rem;
}

/* ---------- 反馈与建议 ---------- */

.page-contact .co-feedback {
  padding: clamp(2.4rem, 6vw, 4.4rem) 0;
  background: var(--paper);
  color: var(--paper-ink);
}

.page-contact .co-fb-grid {
  display: grid;
  gap: 1px;
  background: var(--co-paper-line);
  border-top: 1px solid var(--co-paper-line);
  border-bottom: 1px solid var(--co-paper-line);
}

.page-contact .co-fb {
  padding: clamp(1.2rem, 3vw, 1.7rem) clamp(0.9rem, 2.4vw, 1.4rem);
  background: var(--paper);
}

.page-contact .co-fb__tag {
  display: inline-block;
  margin-bottom: 0.85rem;
  padding: 0.12rem 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--paper);
}

.page-contact .co-fb__tag--cyan {
  background: var(--cyan-deep);
}

.page-contact .co-fb__tag--green {
  background: #3f7a2a;
}

.page-contact .co-fb__tag--bronze {
  background: #8a5724;
}

.page-contact .co-fb__t {
  margin: 0 0 0.65rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.05rem, 2.8vw, 1.22rem);
  line-height: 1.35;
  color: var(--paper-ink);
}

.page-contact .co-fb__p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.85;
  color: rgba(35, 42, 51, 0.82);
}

.page-contact .co-fb-note {
  margin: clamp(1.2rem, 3vw, 1.8rem) 0 0;
  padding-left: 0.9rem;
  border-left: 2px solid var(--red);
  font-size: 0.88rem;
  line-height: 1.75;
  color: rgba(35, 42, 51, 0.75);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-contact .co-dir-grid,
  .page-contact .co-fb-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-contact .co-channel--wide {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-contact .co-open__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: end;
    gap: clamp(2rem, 5vw, 4rem);
  }

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

  .page-contact .co-step {
    grid-template-columns: 5.5rem minmax(0, 1fr);
    padding: 1.6rem 0;
  }

  .page-contact .co-step__body {
    display: grid;
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    grid-template-rows: auto auto;
    gap: 0.5rem 2rem;
    align-items: start;
  }

  .page-contact .co-step__t {
    grid-column: 1;
    grid-row: 1;
    margin-bottom: 0;
  }

  .page-contact .co-step__p {
    grid-column: 1;
    grid-row: 2;
    margin-bottom: 0;
  }

  .page-contact .co-step__need {
    grid-column: 2;
    grid-row: 1 / span 2;
    padding-left: 1.4rem;
    border-left: 1px solid var(--co-line);
  }

  .page-contact .co-h2 {
    font-size: clamp(1.9rem, 3.6vw, 2.7rem);
  }
}

@media (min-width: 1180px) {
  .page-contact .co-open__lede {
    font-size: 1.125rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .co-lane,
  .page-contact .co-dir,
  .page-contact .co-dir::after,
  .page-contact .co-dir__fit,
  .page-contact .co-step::before,
  .page-contact .co-step__no,
  .page-contact .co-channel {
    transition: none;
  }

  .page-contact .co-lane:hover,
  .page-contact .co-lane:focus-visible {
    transform: none;
  }
}