.page-contact {
  --co-line: var(--hairline);
  --co-line-strong: var(--hairline-strong);
  --co-body: rgba(241, 235, 223, 0.78);
}

.page-contact a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 232, 210, 0.35);
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.page-contact a:hover,
.page-contact a:focus-visible {
  color: var(--cyan-soft);
  border-bottom-color: var(--cyan-soft);
}

/* ===== 首屏 ===== */
.page-contact .co-hero {
  position: relative;
  padding-block: clamp(34px, 5.6vw, 78px) clamp(30px, 5vw, 60px);
  overflow: hidden;
}

.page-contact .co-hero::before {
  content: "";
  position: absolute;
  inset: -1px;
  background-image:
    linear-gradient(to right, rgba(0, 232, 210, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(0, 232, 210, 0.06) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(120% 92% at 10% 0%, #000 0%, transparent 68%);
  mask-image: radial-gradient(120% 92% at 10% 0%, #000 0%, transparent 68%);
  pointer-events: none;
  z-index: 0;
}

.page-contact .co-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 4vw, 54px);
  align-items: center;
}

.page-contact .co-hero h1 {
  margin: 16px 0 0;
  font-size: clamp(31px, 5.4vw, 60px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
  max-width: 16ch;
}

.page-contact .co-hero .lede {
  margin-top: 20px;
  max-width: 40ch;
}

.page-contact .co-hero__facts {
  list-style: none;
  margin: clamp(24px, 3.2vw, 38px) 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--co-line);
  display: flex;
  flex-wrap: wrap;
  gap: clamp(18px, 3vw, 36px);
}

.page-contact .co-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-contact .co-hero__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 800;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-contact .co-hero__unit {
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.page-contact .co-hero__figure {
  margin: 0;
  aspect-ratio: 4 / 3;
  box-shadow: 0 24px 60px -40px rgba(0, 232, 210, 0.45);
}

/* ===== 合作方向 ===== */
.page-contact .co-dirs {
  padding-block: clamp(46px, 6.6vw, 90px);
}

.page-contact .co-dirs__head {
  max-width: 66ch;
  margin-bottom: clamp(26px, 3.8vw, 42px);
}

.page-contact .co-dirs__head h2,
.page-contact .co-flow__head h2,
.page-contact .co-support__intro h2,
.page-contact .co-reach__head h2 {
  margin: 14px 0 0;
  font-size: clamp(25px, 3.5vw, 42px);
  font-weight: 800;
  line-height: 1.13;
  letter-spacing: -0.01em;
}

.page-contact .co-dirs__head .lede,
.page-contact .co-flow__head .lede {
  margin-top: 16px;
  max-width: 56ch;
}

.page-contact .co-dirs__list {
  border-top: 1px solid var(--co-line);
}

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

.page-contact .co-dir__summary {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) 26px;
  grid-template-areas:
    "idx name mark"
    "idx who  mark";
  align-items: start;
  gap: 6px 14px;
  padding: 20px 4px;
  cursor: pointer;
  list-style: none;
  transition: background-color 200ms var(--ease);
}

.page-contact .co-dir__summary::-webkit-details-marker {
  display: none;
}

.page-contact .co-dir__summary:hover,
.page-contact .co-dir__summary:focus-visible {
  background-color: rgba(0, 232, 210, 0.045);
}

.page-contact .co-dir__idx {
  grid-area: idx;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
  padding-top: 5px;
}

.page-contact .co-dir__name {
  grid-area: name;
  font-size: clamp(18px, 2.2vw, 24px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--paper);
}

.page-contact .co-dir__who {
  grid-area: who;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--muted);
}

.page-contact .co-dir__mark {
  grid-area: mark;
  justify-self: end;
  position: relative;
  width: 18px;
  height: 18px;
  margin-top: 6px;
}

.page-contact .co-dir__mark::before,
.page-contact .co-dir__mark::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--cyan);
  transition: transform 220ms var(--ease);
}

.page-contact .co-dir__mark::after {
  transform: rotate(90deg);
}

.page-contact .co-dir[open] .co-dir__mark::after {
  transform: rotate(0deg);
}

.page-contact .co-dir__body {
  padding: 0 4px 26px;
  animation: co-fade 240ms var(--ease);
}

.page-contact .co-dir__body p {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--co-body);
}

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

.page-contact .co-dir__body li {
  position: relative;
  padding-left: 15px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--muted);
}

.page-contact .co-dir__body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 1px;
  background: var(--cyan);
}

@keyframes co-fade {
  from {
    opacity: 0;
    transform: translateY(-5px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ===== 合作流程 ===== */
.page-contact .co-flow {
  padding-block: clamp(46px, 6.6vw, 90px);
}

.page-contact .co-flow__head {
  max-width: 62ch;
  margin-bottom: clamp(24px, 3.4vw, 38px);
}

.page-contact .co-flow__figure {
  margin: 0 0 clamp(32px, 4.4vw, 52px);
  aspect-ratio: 1600 / 520;
}

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

.page-contact .co-flow__step {
  position: relative;
  padding: 0 0 30px 26px;
  border-left: 1px solid var(--co-line);
}

.page-contact .co-flow__step:last-child {
  padding-bottom: 0;
}

.page-contact .co-flow__step::before {
  content: "";
  position: absolute;
  top: 6px;
  left: -5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(0, 232, 210, 0.12);
}

.page-contact .co-flow__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--orange);
  margin-bottom: 10px;
}

.page-contact .co-flow__step h3 {
  margin: 0 0 10px;
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--paper);
}

.page-contact .co-flow__step > p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--co-body);
}

.page-contact .co-flow__need {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px dashed var(--co-line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--muted);
  transition: color 220ms var(--ease), border-color 220ms var(--ease);
}

.page-contact .co-flow__step:hover .co-flow__need,
.page-contact .co-flow__step:focus-within .co-flow__need {
  color: var(--cyan-soft);
  border-top-color: var(--co-line-strong);
}

/* ===== 合作支持 ===== */
.page-contact .co-support {
  padding-block: clamp(46px, 6.6vw, 90px);
  border-top: 1px solid var(--co-line);
}

.page-contact .co-support__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}

.page-contact .co-support__intro .lede {
  margin-top: 16px;
  max-width: 36ch;
}

.page-contact .co-support__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-contact .co-support__list > li {
  display: grid;
  gap: 8px;
  padding: 20px 0;
  border-top: 1px solid var(--co-line);
}

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

.page-contact .co-support__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-contact .co-support__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--co-body);
  max-width: 60ch;
}

.page-contact .co-support__links {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

/* ===== 直接联系 ===== */
.page-contact .co-reach {
  padding-block: clamp(52px, 7vw, 96px);
  color: var(--paper-ink);
}

.page-contact .co-reach .eyebrow {
  color: var(--orange-deep);
}

.page-contact .co-reach .eyebrow::before {
  background: var(--orange-deep);
}

.page-contact .co-reach__head {
  max-width: 64ch;
  margin-bottom: clamp(32px, 4.6vw, 56px);
}

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

.page-contact .co-reach__lede {
  margin: 16px 0 0;
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(22, 16, 12, 0.72);
}

.page-contact .co-reach__grid {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
}

.page-contact .co-reach__item {
  padding-top: 20px;
  border-top: 1px solid var(--paper-line);
}

.page-contact .co-reach__label {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange-deep);
}

.page-contact .co-reach__value {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(23px, 5.4vw, 56px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--paper-ink);
  overflow-wrap: anywhere;
}

.page-contact .co-reach__value--sm {
  font-size: clamp(19px, 2.6vw, 27px);
  font-weight: 700;
  line-height: 1.25;
}

.page-contact .co-reach__value--xs {
  font-family: var(--font-sans);
  font-size: clamp(16px, 1.9vw, 20px);
  font-weight: 600;
  line-height: 1.55;
  letter-spacing: 0;
}

.page-contact .co-reach__note {
  margin: 14px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(22, 16, 12, 0.64);
}

/* ===== 常驻联系条 ===== */
.page-contact .co-bar {
  position: sticky;
  bottom: 0;
  z-index: 5;
  background: rgba(5, 7, 10, 0.93);
  border-top: 1px solid var(--co-line-strong);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.page-contact .co-bar__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
  padding-block: 13px;
}

.page-contact .co-bar__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--orange);
  border: 1px solid rgba(255, 106, 19, 0.42);
  border-radius: 999px;
  padding: 3px 10px;
}

.page-contact .co-bar__value {
  font-family: var(--font-mono);
  font-size: clamp(13px, 1.4vw, 15px);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-contact .co-bar__dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--cyan);
  flex: none;
}

/* ===== 响应式 ===== */
@media (min-width: 700px) {
  .page-contact .co-dir__body ul {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 9px 22px;
  }

  .page-contact .co-support__list > li {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 0 26px;
    align-items: baseline;
  }
}

@media (min-width: 880px) {
  .page-contact .co-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-contact .co-hero__figure {
    transform: translateY(-12px);
  }

  .page-contact .co-dir__summary {
    grid-template-columns: 64px minmax(0, 6fr) minmax(0, 5fr) 28px;
    grid-template-areas: "idx name who mark";
    align-items: center;
    gap: 24px;
    padding: 26px 4px;
  }

  .page-contact .co-dir__idx {
    padding-top: 0;
  }

  .page-contact .co-dir__mark {
    margin-top: 0;
  }

  .page-contact .co-dir__body {
    padding-left: 88px;
    padding-right: clamp(20px, 6vw, 140px);
  }

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

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

@media (min-width: 900px) {
  .page-contact .co-support__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    align-items: start;
  }

  .page-contact .co-flow__steps {
    position: relative;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 clamp(18px, 2.2vw, 30px);
  }

  .page-contact .co-flow__steps::before {
    content: "";
    position: absolute;
    top: 4px;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--co-line);
  }

  .page-contact .co-flow__step {
    padding: 32px 0 0;
    border-left: 0;
  }

  .page-contact .co-flow__step::before {
    top: 0;
    left: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .co-dir__body {
    animation: none;
  }

  .page-contact .co-dir__mark::before,
  .page-contact .co-dir__mark::after,
  .page-contact .co-flow__need,
  .page-contact .co-dir__summary {
    transition: none;
  }

  .page-contact .co-hero__figure {
    transform: none;
  }
}