.page-contact {
  background: var(--ink-900);
  color: var(--body-text);
  font-family: var(--font-sans);
  line-height: 1.75;
  overflow-x: hidden;
}

.page-contact h1,
.page-contact h2,
.page-contact h3,
.page-contact p,
.page-contact figure,
.page-contact ol,
.page-contact ul {
  margin: 0;
}

.page-contact a {
  color: var(--cyan);
  text-decoration: none;
}

.page-contact .breadcrumb {
  padding-top: clamp(20px, 3vw, 34px);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
  display: flex;
  gap: 10px;
  align-items: center;
}

.page-contact .breadcrumb a {
  color: var(--muted);
  transition: color 0.2s ease;
}

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

.page-contact .breadcrumb__sep {
  color: var(--line);
}

/* 首屏 */
.page-contact .co-hero {
  padding: clamp(34px, 5vw, 64px) 0 clamp(44px, 6vw, 82px);
  border-bottom: 1px solid var(--line);
}

.page-contact .eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  text-transform: none;
}

.page-contact .co-hero h1 {
  margin-top: clamp(14px, 2vw, 22px);
  font-size: clamp(36px, 7.4vw, 92px);
  font-weight: 900;
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--white);
  max-width: 18ch;
}

.page-contact .co-hero__lede {
  margin-top: clamp(20px, 3vw, 34px);
  max-width: 62ch;
  font-size: clamp(15px, 1.5vw, 17px);
  color: var(--body-text);
}

.page-contact .co-facts {
  list-style: none;
  padding: 0;
  margin-top: clamp(32px, 5vw, 58px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-contact .co-fact {
  background: var(--ink-900);
  padding: 18px clamp(14px, 2vw, 24px) 20px;
  display: grid;
  gap: 4px;
}

.page-contact .co-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-contact .co-fact__label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* 章节头 */
.page-contact .co-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(26px, 4vw, 46px);
  max-width: 100%;
}

.page-contact .co-head--tight {
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-contact .co-head__index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-contact .co-head__title {
  font-size: clamp(26px, 3.6vw, 46px);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-contact .co-head__note {
  max-width: 56ch;
  font-size: 15px;
  color: var(--muted);
}

/* 合作方向 */
.page-contact .co-directions {
  padding: var(--pad-y) 0;
  border-bottom: 1px solid var(--line);
}

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

.page-contact .co-dir {
  background: var(--ink-900);
  padding: clamp(24px, 3.4vw, 44px) clamp(20px, 3vw, 40px) clamp(28px, 3.6vw, 48px);
  border-left: 2px solid transparent;
  transition: background 0.26s ease, border-color 0.26s ease;
}

.page-contact .co-dir:hover,
.page-contact .co-dir:focus-within {
  background: var(--ink-800);
  border-left-color: var(--cyan);
}

.page-contact .co-dir__index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-contact .co-dir__title {
  margin-top: 12px;
  font-size: clamp(21px, 2.4vw, 28px);
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.01em;
}

.page-contact .co-dir__audience {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--blue);
}

.page-contact .co-dir__body {
  margin-top: 16px;
  font-size: 15px;
  color: var(--body-text);
}

.page-contact .co-dir__body a {
  border-bottom: 1px solid var(--line);
  transition: border-color 0.24s ease, color 0.24s ease;
}

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

/* 流程 */
.page-contact .co-flow {
  padding: var(--pad-y) 0;
  border-bottom: 1px solid var(--line);
}

.page-contact .co-flow__figure {
  margin-bottom: clamp(24px, 3.4vw, 40px);
}

.page-contact .co-steps {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  counter-reset: none;
}

.page-contact .co-step {
  background: var(--ink-900);
  padding: clamp(22px, 2.8vw, 34px) clamp(18px, 2.4vw, 28px) clamp(26px, 3.2vw, 40px);
  position: relative;
  transition: background 0.26s ease;
}

.page-contact .co-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 0;
  height: 2px;
  background: var(--cyan);
  transition: width 0.4s cubic-bezier(0.2, 0.7, 0.3, 1);
}

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

.page-contact .co-step:hover,
.page-contact .co-step:focus-within {
  background: var(--ink-800);
}

.page-contact .co-step__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(38px, 5vw, 62px);
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--line);
  transition: -webkit-text-stroke-color 0.26s ease, color 0.26s ease;
}

.page-contact .co-step:hover .co-step__num,
.page-contact .co-step:focus-within .co-step__num {
  -webkit-text-stroke-color: var(--cyan);
  color: rgba(51, 230, 206, 0.12);
}

.page-contact .co-step__title {
  margin-top: 16px;
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 700;
  color: var(--white);
}

.page-contact .co-step__body {
  margin-top: 12px;
  font-size: 14.5px;
  color: var(--body-text);
}

.page-contact .co-step__body a {
  border-bottom: 1px solid var(--line);
  transition: border-color 0.24s ease;
}

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

/* 回复节奏 */
.page-contact .co-sla {
  padding: var(--pad-y) 0;
  border-bottom: 1px solid var(--line);
}

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

.page-contact .co-sla__item {
  background: var(--ink-900);
  padding: clamp(20px, 2.6vw, 30px) clamp(18px, 2.4vw, 28px);
}

.page-contact .co-sla__value {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 30px);
  font-weight: 700;
  color: var(--amber);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.page-contact .co-sla__label {
  margin-top: 8px;
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
}

.page-contact .co-sla__desc {
  margin-top: 6px;
  font-size: 14px;
  color: var(--muted);
}

/* 联系方式 */
.page-contact .co-contact {
  position: relative;
  overflow: hidden;
  padding: var(--pad-y) 0;
  background: linear-gradient(160deg, var(--ink-800) 0%, var(--ink-900) 72%);
  border-bottom: 1px solid var(--line);
}

.page-contact .co-contact__visual {
  position: absolute;
  inset: 0;
  opacity: 0.16;
  pointer-events: none;
  z-index: 0;
}

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

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

.page-contact .co-contact__grid {
  display: grid;
  gap: clamp(36px, 5vw, 64px);
}

.page-contact .co-contact__col {
  display: grid;
  gap: 0;
  align-content: start;
}

.page-contact .co-channel {
  padding: clamp(18px, 2.2vw, 26px) 0;
  border-top: 1px solid var(--line);
}

.page-contact .co-channel__type {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-contact .co-channel__value {
  position: relative;
  display: inline-block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: clamp(15px, 2vw, 22px);
  color: var(--white);
  letter-spacing: -0.01em;
  word-break: break-word;
}

.page-contact .co-channel__value--plain {
  font-family: var(--font-sans);
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.6;
  max-width: 26ch;
}

.page-contact .co-channel__value::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 100%;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.34s cubic-bezier(0.2, 0.7, 0.3, 1);
}

.page-contact a.co-channel__value:hover::after,
.page-contact a.co-channel__value:focus-visible::after {
  transform: scaleX(1);
}

.page-contact a.co-channel__value:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}

.page-contact .co-channel__note {
  margin-top: 14px;
  max-width: 44ch;
  font-size: 14px;
  color: var(--muted);
}

.page-contact .co-checklist {
  list-style: none;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-contact .co-checklist li {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14.5px;
  color: var(--body-text);
  transition: color 0.24s ease;
}

.page-contact .co-checklist li::before {
  content: "";
  width: 16px;
  height: 16px;
  margin-top: 5px;
  border: 1px solid var(--line);
  background: transparent;
  transition: background 0.24s ease, border-color 0.24s ease, box-shadow 0.24s ease;
}

.page-contact .co-checklist li:hover,
.page-contact .co-checklist li:focus-within {
  color: var(--muted);
}

.page-contact .co-checklist li:hover::before,
.page-contact .co-checklist li:focus-within::before {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: inset 0 0 0 3px var(--ink-900);
}

.page-contact .co-contact__aside {
  margin-top: clamp(22px, 3vw, 32px);
  font-size: 14px;
  color: var(--muted);
}

.page-contact .co-contact__aside a {
  border-bottom: 1px solid var(--line);
  transition: border-color 0.24s ease;
}

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

/* 常见疑问 */
.page-contact .co-faq {
  padding: var(--pad-y) 0 calc(var(--pad-y) * 1.2);
}

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

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

.page-contact .co-faq__list .accordion__summary {
  cursor: pointer;
  padding: clamp(18px, 2.2vw, 24px) 34px clamp(18px, 2.2vw, 24px) 0;
  position: relative;
  font-size: clamp(15px, 1.7vw, 18px);
  font-weight: 700;
  color: var(--white);
  list-style: none;
  transition: color 0.24s ease;
}

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

.page-contact .co-faq__list .accordion__summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--muted);
  transition: color 0.24s ease, transform 0.24s ease;
}

.page-contact .co-faq__list .accordion__item[open] .accordion__summary::after {
  content: "–";
  color: var(--cyan);
}

.page-contact .co-faq__list .accordion__summary:hover {
  color: var(--cyan);
}

.page-contact .co-faq__list .accordion__summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-contact .co-faq__list .accordion__body {
  padding: 0 clamp(0px, 2vw, 40px) clamp(20px, 2.6vw, 28px) 0;
  font-size: 14.5px;
  color: var(--body-text);
  max-width: 68ch;
}

/* 响应式 */
@media (min-width: 620px) {
  .page-contact .co-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 880px) {
  .page-contact .co-head {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: end;
    column-gap: var(--gap);
  }

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

  .page-contact .co-head__note {
    text-align: right;
    justify-self: end;
    margin-bottom: 4px;
  }

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

  .page-contact .co-head--tight .co-head__note {
    text-align: left;
    justify-self: start;
  }

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

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

  .page-contact .co-contact__col--prep {
    padding-left: clamp(0px, 3vw, 44px);
    border-left: 1px solid var(--line);
  }

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

@media (min-width: 1200px) {
  .page-contact .co-hero h1 {
    max-width: 16ch;
  }

  .page-contact .co-dir__body {
    max-width: 42ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact *,
  .page-contact *::before,
  .page-contact *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }
}