.page-contact {
  --co-space: clamp(44px, 7vw, 92px);
  --co-gap: clamp(16px, 2.2vw, 28px);
  --co-pad: clamp(18px, 3.2vw, 34px);
  --co-ink: rgba(244, 247, 255, .88);
  --co-soft: rgba(201, 230, 255, .82);
  position: relative;
  overflow-x: clip;
  color: var(--frost);
  font-family: var(--font-body);
  background:
    radial-gradient(1100px 480px at 84% -10%, rgba(127, 212, 255, .13), transparent 62%),
    radial-gradient(880px 440px at 4% 14%, rgba(255, 77, 157, .09), transparent 60%);
}

.page-contact .co-section {
  position: relative;
  padding-block: var(--co-space);
}

.page-contact .co-section--first {
  padding-block-start: clamp(22px, 4vw, 42px);
}

.page-contact .co-section--last {
  padding-block-end: clamp(52px, 8vw, 104px);
}

/* ---------- 首屏 ---------- */
.page-contact .co-hero {
  margin-block-start: clamp(18px, 3vw, 32px);
}

.page-contact .co-hero__lede {
  max-width: 72ch;
}

.page-contact .co-eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--cyan);
}

.page-contact .co-title {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(28px, 5vw, 50px);
  line-height: 1.16;
  letter-spacing: .02em;
  color: var(--frost);
}

.page-contact .co-lead {
  margin: 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.82;
  color: var(--co-ink);
}

.page-contact .co-hero__grid {
  display: grid;
  gap: var(--co-gap);
  margin-block-start: clamp(24px, 4vw, 44px);
}

.page-contact .co-tracks {
  display: grid;
  gap: var(--co-gap);
}

.page-contact .co-track {
  --accent: var(--ice);
  position: relative;
  padding: var(--co-pad);
  border: 1px solid var(--line);
  border-radius: var(--r-2);
  background: linear-gradient(155deg, rgba(16, 26, 56, .96) 0%, rgba(7, 11, 26, .9) 78%);
  transition: transform .16s var(--ease), border-color .16s var(--ease);
}

.page-contact .co-track::before {
  content: "";
  position: absolute;
  inset-block-start: -1px;
  inset-inline-start: var(--co-pad);
  width: 48px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
}

.page-contact .co-track--channel { --accent: var(--cyan); }
.page-contact .co-track--license { --accent: var(--gold); }
.page-contact .co-track--coedit { --accent: var(--magenta); }

.page-contact .co-track__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin-block-end: 10px;
}

.page-contact .co-track__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--accent);
}

.page-contact .co-track__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(19px, 2.1vw, 23px);
  letter-spacing: .02em;
  color: var(--frost);
}

.page-contact .co-track__who {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.76;
  color: var(--co-ink);
}

.page-contact .co-track__need {
  display: grid;
  gap: 5px;
  margin: 0;
  padding-block-start: 13px;
  border-block-start: 1px dashed var(--line);
}

.page-contact .co-track__need dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--stone);
}

.page-contact .co-track__need dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--co-soft);
}

/* ---------- 意向卡 ---------- */
.page-contact .co-intent {
  position: relative;
  padding: var(--co-pad);
  border: 1px solid var(--line);
  border-radius: var(--r-2);
  background: linear-gradient(180deg, rgba(30, 42, 68, .94), rgba(16, 26, 56, .97));
  box-shadow:
    0 30px 58px -30px rgba(7, 11, 26, .95),
    -10px 10px 0 -4px rgba(16, 26, 56, .5),
    0 0 0 1px rgba(127, 212, 255, .07) inset;
}

.page-contact .co-intent::after {
  content: "";
  position: absolute;
  inset-block-start: -1px;
  inset-inline-end: -1px;
  width: 34px;
  height: 34px;
  background: linear-gradient(225deg, rgba(255, 196, 107, .34) 0%, rgba(255, 196, 107, .06) 48%, transparent 52%);
  pointer-events: none;
}

.page-contact .co-intent__tag {
  display: inline-flex;
  align-items: center;
  padding: 5px 11px;
  border: 1px solid rgba(255, 196, 107, .38);
  border-radius: 999px;
  background: rgba(255, 196, 107, .09);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .13em;
  color: var(--gold);
}

.page-contact .co-intent__title {
  margin: 16px 0 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(19px, 2.2vw, 23px);
  line-height: 1.4;
  letter-spacing: .02em;
  color: var(--frost);
}

.page-contact .co-intent__note {
  margin: 0 0 6px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--stone);
}

.page-contact .co-intent__fields {
  display: grid;
}

.page-contact .co-intent__field {
  padding-block: 14px;
  border-block-start: 1px dashed var(--line);
}

.page-contact .co-field__label {
  display: block;
  margin-block-end: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--ice);
}

.page-contact .co-field__value {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--co-ink);
}

.page-contact .co-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-contact .co-chip {
  padding: 6px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(7, 11, 26, .5);
  font-size: 13px;
  color: var(--stone);
}

.page-contact .co-chip--on {
  border-color: var(--gold);
  background: linear-gradient(180deg, rgba(255, 196, 107, .24), rgba(255, 196, 107, .08));
  color: var(--gold);
}

.page-contact .co-intent__cta {
  margin-block-start: 18px;
  width: 100%;
  justify-content: center;
}

/* ---------- 图片容器 ---------- */
.page-contact .co-visual {
  margin: clamp(24px, 4vw, 46px) 0 0;
  border: 1px solid var(--line);
  border-radius: var(--r-2);
  background: var(--indigo);
  overflow: hidden;
}

.page-contact .co-visual img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-contact .co-visual__caption {
  display: block;
  padding: 12px 16px;
  border-block-start: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--stone);
}

/* ---------- 章节头 ---------- */
.page-contact .co-head {
  display: grid;
  gap: 10px;
  max-width: 66ch;
  margin-block-end: clamp(22px, 3.4vw, 40px);
}

.page-contact .co-head__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--ice);
}

.page-contact .co-head__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(23px, 3.2vw, 34px);
  line-height: 1.26;
  letter-spacing: .02em;
  color: var(--frost);
}

.page-contact .co-head__lead {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--co-ink);
}

/* ---------- 合作流程 ---------- */
.page-contact .co-flow-grid {
  display: grid;
  gap: var(--co-gap);
}

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

.page-contact .co-flow::before {
  content: "";
  position: absolute;
  inset-block: 18px;
  inset-inline-start: 17px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(127, 212, 255, .28) 62%, rgba(255, 196, 107, .3) 100%);
}

.page-contact .co-flow__step {
  position: relative;
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 16px;
  padding-block: 15px;
}

.page-contact .co-flow__num {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--void);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--ice);
}

.page-contact .co-flow__step:last-child .co-flow__num {
  border-color: rgba(255, 196, 107, .58);
  color: var(--gold);
}

.page-contact .co-flow__title {
  margin: 5px 0 6px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: .02em;
  color: var(--frost);
}

.page-contact .co-flow__text {
  margin: 0 0 11px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--co-ink);
}

.page-contact .co-flow__owner {
  display: inline-flex;
  padding: 4px 10px;
  border: 1px dashed var(--line);
  border-radius: var(--r-1);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--stone);
}

.page-contact .co-visual--side {
  margin: 0;
}

/* ---------- 渠道 ---------- */
.page-contact .co-channels {
  display: grid;
  gap: var(--co-gap);
}

.page-contact .co-channel {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: var(--co-pad);
  border: 1px solid var(--line);
  border-radius: var(--r-2);
  background: linear-gradient(180deg, rgba(16, 26, 56, .72), rgba(7, 11, 26, .6));
}

.page-contact .co-channel__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--ice);
}

.page-contact .co-channel__value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: .03em;
  line-height: 1.5;
  color: var(--frost);
  overflow-wrap: anywhere;
}

.page-contact .co-channel__use {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--co-soft);
}

.page-contact .co-channel__link {
  margin-block-start: auto;
  align-self: flex-start;
  font-size: 14px;
  color: var(--cyan);
  text-decoration: none;
  border-block-end: 1px solid rgba(53, 224, 208, .38);
  padding-block-end: 2px;
}

.page-contact .co-channel__link:hover,
.page-contact .co-channel__link:focus-visible {
  color: var(--gold);
  border-block-end-color: rgba(255, 196, 107, .6);
}

.page-contact .co-support {
  margin: clamp(22px, 3.4vw, 36px) 0 0;
  max-width: 74ch;
  padding-inline-start: 16px;
  border-inline-start: 2px solid rgba(53, 224, 208, .5);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--co-soft);
}

.page-contact .co-support a,
.page-contact .co-faq__a a {
  color: var(--ice);
  text-decoration: none;
  border-block-end: 1px solid rgba(127, 212, 255, .34);
}

.page-contact .co-support a:hover,
.page-contact .co-faq__a a:hover,
.page-contact .co-support a:focus-visible,
.page-contact .co-faq__a a:focus-visible {
  color: var(--gold);
  border-block-end-color: rgba(255, 196, 107, .6);
}

/* ---------- 常见问题 ---------- */
.page-contact .co-faq {
  display: grid;
  gap: 10px;
}

.page-contact .co-faq__item {
  border: 1px solid var(--line);
  border-radius: var(--r-2);
  background: rgba(16, 26, 56, .5);
  overflow: hidden;
}

.page-contact .co-faq__q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px var(--co-pad);
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 15.5px;
  line-height: 1.5;
  letter-spacing: .01em;
  color: var(--frost);
}

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

.page-contact .co-faq__q::after {
  content: "＋";
  flex: none;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--cyan);
}

.page-contact .co-faq__item[open] .co-faq__q::after {
  content: "－";
  color: var(--gold);
}

.page-contact .co-faq__item[open] .co-faq__q {
  border-block-end: 1px dashed var(--line);
}

.page-contact .co-faq__a {
  margin: 0;
  padding: 14px var(--co-pad) 18px;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--co-ink);
}

/* ---------- 通讯地址 ---------- */
.page-contact .co-address {
  padding: var(--co-pad);
  border: 1px solid var(--line);
  border-inline-start: 3px solid var(--gold);
  border-radius: var(--r-2);
  background: linear-gradient(120deg, rgba(7, 11, 26, .92), rgba(16, 26, 56, .78));
}

.page-contact .co-address__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--gold);
}

.page-contact .co-address__title {
  margin: 12px 0 10px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(19px, 2.4vw, 24px);
  line-height: 1.4;
  letter-spacing: .02em;
  color: var(--frost);
}

.page-contact .co-address__value {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: clamp(16px, 2.3vw, 20px);
  letter-spacing: .04em;
  line-height: 1.5;
  color: var(--crystal);
  overflow-wrap: anywhere;
}

.page-contact .co-address__note {
  margin: 0;
  max-width: 66ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--co-soft);
}

/* ---------- 响应式 ---------- */
@media (hover: hover) {
  .page-contact .co-track:hover {
    transform: translateY(-2px);
    border-color: rgba(127, 212, 255, .34);
  }
}

@media (min-width: 700px) {
  .page-contact .co-track__who {
    font-size: 15.5px;
  }

  .page-contact .co-flow__step {
    padding-block: 18px;
  }
}

@media (min-width: 880px) {
  .page-contact .co-channels {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-contact .co-flow-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(24px, 3vw, 46px);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-contact .co-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(24px, 3vw, 46px);
    align-items: start;
  }

  .page-contact .co-intent {
    position: sticky;
    top: 104px;
  }
}

@media (min-width: 1200px) {
  .page-contact .co-track {
    padding-inline: clamp(24px, 2.4vw, 38px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .co-track,
  .page-contact .co-visual,
  .page-contact .co-intent {
    transition: none;
  }

  .page-contact .co-track:hover {
    transform: none;
  }
}