.page-contact {
  --co-gap: clamp(20px, 4vw, 44px);
  --co-pad: clamp(20px, 4vw, 38px);
  --co-shadow: 0 26px 64px rgba(3, 10, 22, 0.45);
  background: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-contact .section {
  padding: clamp(44px, 8vw, 92px) 0;
}

.page-contact h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 3.1vw, 31px);
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.26;
}

.page-contact .label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-contact .co-hero {
  position: relative;
  padding: clamp(22px, 5vw, 54px) 0 clamp(38px, 7vw, 84px);
  background:
    radial-gradient(115% 88% at 88% -10%, rgba(0, 229, 204, 0.18), transparent 62%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 62%, var(--ink-700) 100%);
  overflow: hidden;
}

.page-contact .co-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(191, 247, 242, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(191, 247, 242, 0.06) 1px, transparent 1px);
  background-size: 72px 72px;
  pointer-events: none;
}

.page-contact .co-hero__grid {
  position: relative;
  display: grid;
  gap: var(--co-gap);
  align-items: center;
}

.page-contact .co-hero__paper {
  position: relative;
  background: var(--paper);
  color: var(--ink-900);
  padding: var(--co-pad);
  border: 1px solid rgba(6, 18, 38, 0.16);
  box-shadow: var(--co-shadow);
}

.page-contact .co-hero__paper::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 6px;
  background: linear-gradient(180deg, var(--cyan), var(--ink-700));
}

.page-contact .co-hero__paper::after {
  content: "06";
  position: absolute;
  right: 16px;
  top: 10px;
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 48px);
  line-height: 1;
  letter-spacing: -0.04em;
  color: rgba(6, 18, 38, 0.08);
  pointer-events: none;
}

.page-contact .co-hero__crumb .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-contact .co-hero__crumb .breadcrumb__link {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-700);
  text-decoration: none;
}

.page-contact .co-hero__crumb .breadcrumb__link:hover,
.page-contact .co-hero__crumb .breadcrumb__link:focus-visible {
  color: var(--ink-900);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-contact .co-hero__crumb .breadcrumb__sep {
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(6, 18, 38, 0.35);
}

.page-contact .co-hero__label {
  margin: clamp(18px, 3vw, 26px) 0 0;
  color: var(--ink-700);
  border-bottom: 1px solid rgba(6, 18, 38, 0.5);
  padding-bottom: 6px;
}

.page-contact .co-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 4.4vw, 44px);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.2;
  max-width: 20ch;
}

.page-contact .co-hero__lead {
  margin: clamp(14px, 2.6vw, 20px) 0 0;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.78;
  color: var(--ink-700);
  max-width: 58ch;
}

.page-contact .co-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3.6vw, 30px);
}

.page-contact .co-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  list-style: none;
}

.page-contact .co-hero__chips li {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  padding: 6px 10px;
  border: 1px solid rgba(6, 18, 38, 0.22);
  background: var(--paper-light);
  color: var(--ink-700);
}

.page-contact .co-hero__visual {
  position: relative;
  margin: 0;
  border: 1px solid var(--line-strong);
  background: var(--ink-600);
  box-shadow: 0 18px 48px rgba(3, 10, 22, 0.4);
}

.page-contact .co-hero__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-contact .co-hero__visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 229, 204, 0.14) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 204, 0.14) 1px, transparent 1px);
  background-size: 40px 40px;
  mix-blend-mode: screen;
  pointer-events: none;
}

/* ---------- 合作方向索引 ---------- */
.page-contact .co-index {
  background: linear-gradient(180deg, var(--ink-700) 0%, var(--ink-900) 78%);
}

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

.page-contact .co-index__note {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--cyan-soft);
  max-width: 36ch;
}

.page-contact .co-tabs {
  list-style: none;
  margin: clamp(20px, 4vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-contact .co-tabs__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 13px 14px;
  border-left: 2px solid transparent;
  background: rgba(191, 247, 242, 0.05);
  color: var(--paper);
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 15px;
  letter-spacing: 0.06em;
  transition: background 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}

.page-contact .co-tabs__link:hover,
.page-contact .co-tabs__link:focus-visible {
  background: rgba(0, 229, 204, 0.16);
  border-left-color: var(--cyan);
  transform: translateX(4px);
  outline: none;
}

.page-contact .co-tabs__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
}

.page-contact .co-dir {
  padding: clamp(20px, 3.4vw, 30px) 0;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 12px;
  scroll-margin-top: 90px;
}

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

.page-contact .co-dir__head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 12px;
}

.page-contact .co-dir__num {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--ink-900);
  background: var(--cyan);
  padding: 3px 9px;
}

.page-contact .co-dir h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.2vw, 22px);
  letter-spacing: 0.05em;
  color: var(--paper);
}

.page-contact .co-dir .tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  padding: 3px 8px;
  border: 1px solid var(--line-strong);
  color: var(--cyan);
}

.page-contact .co-dir .tag--amber {
  border-color: rgba(255, 138, 61, 0.55);
  color: var(--amber);
}

.page-contact .co-dir__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--cyan-soft);
  max-width: 62ch;
}

.page-contact .co-dir__meta {
  display: grid;
  gap: 10px;
  margin: 2px 0 0;
  padding: 0;
  list-style: none;
}

.page-contact .co-dir__meta li {
  display: grid;
  gap: 3px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--paper);
}

.page-contact .co-dir__meta b {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

/* ---------- 联系方式与合作流程 ---------- */
.page-contact .co-channels {
  background: var(--paper);
  color: var(--ink-900);
}

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

.page-contact .co-card {
  position: relative;
  background: var(--ink-800);
  color: var(--paper);
  padding: var(--co-pad);
  border: 1px solid var(--ink-900);
  box-shadow: 0 18px 44px rgba(6, 18, 38, 0.2);
}

.page-contact .co-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--amber) 100%);
}

.page-contact .co-card__label {
  color: var(--cyan);
}

.page-contact .co-card__title {
  margin: 12px 0 clamp(16px, 3vw, 24px);
  font-size: clamp(21px, 2.8vw, 27px);
  color: var(--paper);
}

.page-contact .co-card__row {
  display: grid;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px dashed rgba(191, 247, 242, 0.22);
}

.page-contact .co-card__row--last {
  border-bottom: none;
}

.page-contact .co-card__key {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-contact .co-card__val {
  font-family: var(--font-mono);
  font-size: clamp(15px, 2vw, 18px);
  letter-spacing: 0.02em;
  color: var(--paper);
  text-decoration: none;
  word-break: break-all;
  transition: color 0.2s ease;
}

.page-contact .co-card__val--plain {
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--cyan-soft);
  letter-spacing: 0;
}

.page-contact a.co-card__val:hover,
.page-contact a.co-card__val:focus-visible {
  color: var(--amber);
  text-decoration: underline;
  text-underline-offset: 4px;
  outline: none;
}

.page-contact .co-card__note {
  margin: clamp(14px, 2.4vw, 20px) 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(191, 247, 242, 0.85);
}

.page-contact .co-flow__label {
  color: var(--ink-700);
}

.page-contact .co-flow__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.4vw, 24px);
  letter-spacing: 0.05em;
  color: var(--ink-900);
}

.page-contact .co-flow__list {
  list-style: none;
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0;
  counter-reset: co-step;
  display: grid;
  gap: 16px;
}

.page-contact .co-flow__item {
  position: relative;
  padding: 6px 10px 6px 52px;
  counter-increment: co-step;
  transition: background 0.2s ease, transform 0.2s ease;
}

.page-contact .co-flow__item::before {
  content: counter(co-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--ink-900);
  background: var(--cyan);
  border-radius: 50%;
}

.page-contact .co-flow__item:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 16px;
  top: 40px;
  bottom: -14px;
  width: 1px;
  background: rgba(6, 18, 38, 0.22);
}

.page-contact .co-flow__item:hover,
.page-contact .co-flow__item:focus-within {
  background: rgba(0, 229, 204, 0.16);
  transform: translateX(3px);
}

.page-contact .co-flow__item h4 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 16px;
  letter-spacing: 0.05em;
  color: var(--ink-900);
}

.page-contact .co-flow__item p {
  margin: 6px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-700);
}

.page-contact .co-figure {
  margin: clamp(20px, 3.4vw, 28px) 0 0;
  border: 1px solid rgba(6, 18, 38, 0.16);
  background: var(--paper-light);
  padding: 8px;
}

.page-contact .co-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-contact .co-figure__cap {
  padding: 10px 4px 2px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--ink-700);
}

/* ---------- 工作时间与响应 ---------- */
.page-contact .co-hours {
  background: var(--ink-800);
}

.page-contact .co-hours__title {
  max-width: 24ch;
}

.page-contact .co-hours__grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(20px, 3.4vw, 30px);
}

.page-contact .co-hours__panel {
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(18, 52, 90, 0.85), rgba(11, 31, 58, 0.6));
  padding: clamp(18px, 3vw, 26px);
}

.page-contact .co-hours__key {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-contact .co-hours__time {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.8vw, 26px);
  letter-spacing: 0.03em;
  color: var(--paper);
}

.page-contact .co-hours__text {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--cyan-soft);
}

.page-contact .co-hours__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-contact .co-hours__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--paper);
}

.page-contact .co-hours__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 7px;
  height: 7px;
  background: var(--cyan);
  transform: rotate(45deg);
}

/* ---------- 地址与备案 ---------- */
.page-contact .co-locate {
  background: var(--paper-light);
  color: var(--ink-900);
}

.page-contact .co-locate__grid {
  display: grid;
  gap: var(--co-gap);
  align-items: start;
}

.page-contact .co-locate__text .label {
  color: var(--ink-700);
}

.page-contact .co-locate__text h2 {
  max-width: 22ch;
}

.page-contact .co-locate__list {
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
}

.page-contact .co-locate__item {
  display: grid;
  gap: 5px;
  padding: 13px 0;
  border-bottom: 1px dashed rgba(6, 18, 38, 0.22);
}

.page-contact .co-locate__item--last {
  border-bottom: 1px solid rgba(6, 18, 38, 0.4);
}

.page-contact .co-locate__item dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--ink-600);
}

.page-contact .co-locate__item dd {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--ink-900);
  word-break: break-word;
}

.page-contact .co-locate__mono {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  font-size: 14.5px !important;
}

.page-contact .co-locate__link {
  color: var(--ink-800);
  text-decoration: underline;
  text-decoration-color: rgba(11, 31, 58, 0.35);
  text-underline-offset: 4px;
  transition: color 0.2s ease, text-decoration-color 0.2s ease;
}

.page-contact .co-locate__link:hover,
.page-contact .co-locate__link:focus-visible {
  color: var(--amber);
  text-decoration-color: var(--amber);
  outline: none;
}

.page-contact .co-locate__note {
  margin: 16px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-600);
}

.page-contact .co-locate__map {
  border: 1px solid rgba(6, 18, 38, 0.16);
  background: var(--paper);
  padding: 10px;
}

.page-contact .co-locate__map svg {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 常见问题 ---------- */
.page-contact .co-faq {
  background: var(--ink-900);
}

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

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

.page-contact .co-faq__q {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: clamp(15px, 1.9vw, 17px);
  letter-spacing: 0.04em;
  color: var(--paper);
}

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

.page-contact .co-faq__q::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1.2;
  color: var(--cyan);
}

.page-contact .co-faq__item[open] .co-faq__q::after {
  content: "\2212";
}

.page-contact .co-faq__q:hover,
.page-contact .co-faq__q:focus-visible {
  color: var(--cyan);
  outline: none;
}

.page-contact .co-faq__a {
  margin: 0 0 18px;
  padding-right: 24px;
  font-size: 15px;
  line-height: 1.82;
  color: var(--cyan-soft);
  max-width: 68ch;
}

.page-contact .co-faq__more {
  margin: clamp(20px, 3vw, 28px) 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--paper);
}

.page-contact .co-faq__link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 204, 0.45);
  margin: 0 3px;
}

.page-contact .co-faq__link:hover,
.page-contact .co-faq__link:focus-visible {
  color: var(--amber);
  border-bottom-color: var(--amber);
  outline: none;
}

/* ---------- 反馈 ---------- */
.page-contact .co-feedback {
  background: linear-gradient(140deg, var(--ink-700) 0%, var(--ink-900) 72%);
  padding-bottom: clamp(56px, 9vw, 104px);
}

.page-contact .co-feedback__panel {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  background: rgba(0, 229, 204, 0.06);
  padding: var(--co-pad);
}

.page-contact .co-feedback__panel::after {
  content: "";
  position: absolute;
  right: -60px;
  top: -60px;
  width: 180px;
  height: 180px;
  border: 1px solid rgba(255, 138, 61, 0.4);
  transform: rotate(45deg);
  pointer-events: none;
}

.page-contact .co-feedback__label {
  color: var(--amber);
}

.page-contact .co-feedback__text {
  position: relative;
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--cyan-soft);
  max-width: 66ch;
}

.page-contact .co-feedback__link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 204, 0.45);
  margin: 0 2px;
}

.page-contact .co-feedback__link:hover,
.page-contact .co-feedback__link:focus-visible {
  color: var(--amber);
  border-bottom-color: var(--amber);
  outline: none;
}

.page-contact .co-feedback__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 3vw, 26px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-contact .co-hours__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (min-width: 900px) {
  .page-contact .co-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    gap: clamp(24px, 3.4vw, 44px);
  }

  .page-contact .co-index__grid {
    grid-template-columns: minmax(0, 272px) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-contact .co-index__side {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-contact .co-channels__grid {
    grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.12fr);
    align-items: start;
    gap: clamp(26px, 3.6vw, 48px);
  }

  .page-contact .co-locate__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-contact .co-locate__map {
    position: sticky;
    top: 96px;
  }
}

@media (min-width: 1180px) {
  .page-contact .co-hero__title {
    font-size: 46px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-contact .co-tabs__link,
  .page-contact .co-flow__item,
  .page-contact .co-card__val,
  .page-contact .co-locate__link {
    transition: none;
  }

  .page-contact .co-tabs__link:hover,
  .page-contact .co-flow__item:hover {
    transform: none;
  }
}