.page-contact {
  padding-top: var(--header-h);
  background: var(--ink);
  color: var(--chalk);
  overflow-x: hidden;
  font-family: var(--font-body);
}

.page-contact .crumbs {
  padding: 18px 0 0;
}

.page-contact .chapter {
  padding-block: clamp(44px, 7vw, 92px);
}

/* ---------- 开篇 ---------- */
.page-contact .contact-open {
  padding-bottom: clamp(28px, 4vw, 48px);
  background:
    linear-gradient(168deg, rgba(53, 242, 200, 0.07) 0%, rgba(53, 242, 200, 0) 42%),
    var(--ink);
}

.page-contact .contact-open__grid {
  gap: var(--gutter);
  align-items: start;
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-contact .contact-open__title {
  font-family: var(--font-display);
  font-size: clamp(2.15rem, 8.5vw, 4.4rem);
  font-weight: 300;
  line-height: 1.02;
  letter-spacing: -0.01em;
  margin: 6px 0 18px;
  color: var(--chalk);
}

.page-contact .contact-open__aside {
  margin-top: 8px;
}

.page-contact .contact-slab {
  padding: 20px;
  background:
    repeating-linear-gradient(135deg, rgba(53, 242, 200, 0.06) 0 2px, rgba(53, 242, 200, 0) 2px 12px),
    var(--turf-deep);
  border: var(--edge);
  box-shadow: var(--shadow-hard);
}

.page-contact .contact-slab__num {
  font-size: clamp(1.45rem, 6vw, 2.1rem);
  color: var(--cyan);
  letter-spacing: 0.02em;
  margin: 8px 0 10px;
}

.page-contact .contact-slab__cap {
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--mist);
  margin: 0;
}

.page-contact .contact-open__figure {
  margin: 0;
}

.page-contact .figure {
  border: var(--edge);
  background: var(--turf-deep);
  box-shadow: var(--shadow-hard);
}

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

.page-contact .figure__caption {
  padding: 12px 16px;
  border-top: 1px solid var(--steel);
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 章节头部 ---------- */
.page-contact .chapter__head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-bottom: clamp(22px, 3vw, 36px);
}

.page-contact .chapter__index {
  font-size: clamp(2.2rem, 10vw, 4rem);
  line-height: 0.9;
  color: var(--mist);
  margin: 0;
  transition: color var(--ease);
}

.page-contact .chapter[data-chapter].is-active .chapter__index {
  color: var(--cyan);
}

.page-contact .chapter__title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 5.6vw, 2.4rem);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.005em;
  margin: 6px 0 10px;
  color: var(--chalk);
}

.page-contact .chapter__lede {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--mist);
  max-width: 62ch;
  margin: 0;
}

.page-contact .chapter__kicker {
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0;
}

.page-contact .prose {
  font-size: 1rem;
  line-height: 1.78;
  color: var(--chalk);
  max-width: 62ch;
  margin: 0 0 14px;
}

.page-contact .prose a,
.page-contact .chapter__lede a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

/* ---------- 01 联系渠道 ---------- */
.page-contact .contact-channels {
  background: var(--turf-deep);
}

.page-contact .contact-dl {
  margin: 0;
  border: var(--edge);
  background: var(--turf);
  box-shadow: var(--shadow-hard);
}

.page-contact .contact-dl__row {
  display: grid;
  gap: 8px;
  padding: 18px;
  transition: transform var(--ease), box-shadow var(--ease);
}

.page-contact .contact-dl__row + .contact-dl__row {
  border-top: 1px solid var(--steel);
}

.page-contact .contact-dl__term {
  margin: 0;
}

.page-contact .contact-dl__term .eyebrow {
  color: var(--mist);
  margin: 0;
}

.page-contact .contact-dl__desc {
  margin: 0;
  display: grid;
  gap: 8px;
}

.page-contact .contact-dl__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.02rem, 3.6vw, 1.3rem);
  color: var(--chalk);
  overflow-wrap: anywhere;
  word-break: break-word;
}

.page-contact .contact-dl__hint {
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-contact .contact-dl__row:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hard-lift);
}

.page-contact .note {
  display: block;
  margin: 20px 0 0;
  padding: 16px 18px;
  border-left: 3px solid var(--amber);
  background: rgba(242, 179, 61, 0.06);
}

.page-contact .note__label {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 6px;
}

.page-contact .note__body {
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--chalk);
}

/* ---------- 02 回复时段 ---------- */
.page-contact .contact-window__panel {
  border: var(--edge);
  background: var(--turf-deep);
  box-shadow: var(--shadow-hard);
  padding: clamp(20px, 4vw, 32px);
}

.page-contact .contact-window__big {
  font-size: clamp(1.75rem, 8.5vw, 3.2rem);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: 0.01em;
  margin: 0 0 6px;
}

.page-contact .contact-window__list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
}

.page-contact .contact-window__item {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-top: 1px solid var(--steel);
}

.page-contact .contact-window__key {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-contact .contact-window__text {
  font-size: 0.95rem;
  line-height: 1.78;
  color: var(--chalk);
}

/* ---------- 03 写信要点 ---------- */
.page-contact .contact-letter {
  background: var(--paper);
  color: var(--paper-ink);
}

.page-contact .contact-letter .chapter__title,
.page-contact .contact-letter .prose {
  color: var(--paper-ink);
}

.page-contact .contact-letter .chapter__lede {
  color: #3d534b;
}

.page-contact .contact-letter .note__body {
  color: var(--paper-ink);
}

.page-contact .contact-letter .note {
  background: rgba(11, 26, 21, 0.05);
  border-left-color: var(--turf);
}

.page-contact .contact-letter .note__label {
  color: var(--turf);
}

.page-contact .letter-list {
  list-style: none;
  counter-reset: letter;
  margin: 0;
  padding: 0;
}

.page-contact .letter-list li {
  counter-increment: letter;
  position: relative;
  padding: 18px 0 18px 54px;
  border-top: 2px solid var(--turf);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--paper-ink);
}

.page-contact .letter-list li:last-child {
  border-bottom: 2px solid var(--turf);
}

.page-contact .letter-list li::before {
  content: counter(letter, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 18px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.95rem;
  color: var(--turf);
  border-bottom: 2px solid var(--cyan);
  padding-bottom: 2px;
}

.page-contact .letter-figure {
  margin: 0;
  border: 2px solid var(--turf);
  box-shadow: 8px 8px 0 rgba(11, 26, 21, 0.18);
  background: var(--turf-deep);
}

.page-contact .letter-figure .figure__caption {
  background: var(--turf-deep);
}

/* ---------- 04 更正顺序 ---------- */
.page-contact .correct-track {
  display: grid;
  gap: 0;
  border-left: 3px solid var(--cyan);
}

.page-contact .correct-track__row {
  display: grid;
  gap: 8px;
  padding: 18px 0 18px 18px;
}

.page-contact .correct-track__row + .correct-track__row {
  border-top: 1px solid var(--steel);
}

.page-contact .correct-track__key {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-contact .correct-track__val p {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--chalk);
  max-width: 68ch;
}

.page-contact .correct-track__row--span {
  background: rgba(53, 242, 200, 0.05);
}

/* ---------- 05 折叠问答 ---------- */
.page-contact .contact-faq {
  background: var(--turf-deep);
}

.page-contact .faq-stack {
  display: grid;
  gap: 12px;
}

.page-contact .faq-fold {
  border: var(--edge);
  background: var(--turf);
  transition: transform var(--ease), box-shadow var(--ease);
}

.page-contact .faq-fold:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hard);
}

.page-contact .faq-fold__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 18px;
  min-height: 44px;
  cursor: pointer;
  font-family: var(--font-display);
  font-size: clamp(1rem, 4.2vw, 1.15rem);
  letter-spacing: 0.01em;
  color: var(--chalk);
  list-style: none;
}

.page-contact .faq-fold__head::-webkit-details-marker {
  display: none;
}

.page-contact .faq-fold__head::after {
  content: "＋";
  font-family: var(--font-mono);
  color: var(--cyan);
  flex: none;
}

.page-contact .faq-fold[open] .faq-fold__head::after {
  content: "－";
}

.page-contact .faq-fold__body {
  padding: 0 18px 18px;
  border-top: 1px solid var(--steel);
}

.page-contact .faq-fold__body p {
  margin: 14px 0 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--mist);
  max-width: 68ch;
}

/* ---------- 06 引用与合作 ---------- */
.page-contact .contact-side {
  padding: 20px;
  background: var(--turf-deep);
  border: var(--edge);
  box-shadow: var(--shadow-hard);
}

.page-contact .contact-side__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.98rem;
  color: var(--chalk);
  margin: 10px 0 0;
  overflow-wrap: anywhere;
}

.page-contact .contact-side__cap {
  margin: 14px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--steel);
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 收口 ---------- */
.page-contact .contact-coda__band {
  height: clamp(64px, 10vw, 120px);
  background: linear-gradient(100deg, var(--turf) 0%, var(--cyan) 58%, var(--turf-deep) 100%);
  clip-path: polygon(0 22%, 100% 0, 100% 78%, 0 100%);
}

.page-contact .contact-coda {
  padding: clamp(28px, 5vw, 52px) 0 clamp(40px, 6vw, 72px);
  background: var(--ink);
}

.page-contact .contact-coda__legal {
  margin: 0 0 16px;
  max-width: 70ch;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-contact .contact-coda__meta {
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--cyan);
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--steel);
}

/* ---------- 响应式 ---------- */
@media (min-width: 768px) {
  .page-contact .chapter__head {
    grid-template-columns: 96px 1fr;
    gap: 22px;
    align-items: start;
  }

  .page-contact .contact-dl__row {
    grid-template-columns: 190px 1fr;
    align-items: start;
    gap: 20px;
  }

  .page-contact .contact-window__item {
    grid-template-columns: 140px 1fr;
    align-items: baseline;
    gap: 18px;
  }

  .page-contact .correct-track__row {
    grid-template-columns: 110px 1fr;
    align-items: start;
    gap: 20px;
    padding-left: 24px;
  }
}

@media (min-width: 1024px) {
  .page-contact .contact-open__grid {
    align-items: end;
  }

  .page-contact .contact-open__aside {
    margin-top: 0;
    transform: translateY(-6px);
  }

  .page-contact .contact-window__panel {
    display: grid;
    grid-template-columns: minmax(240px, 1fr) minmax(0, 2fr);
    gap: clamp(24px, 4vw, 56px);
    align-items: start;
  }

  .page-contact .contact-window__list {
    margin-top: 0;
  }

  .page-contact .contact-window__item:first-child {
    border-top: none;
    padding-top: 0;
  }

  .page-contact .contact-letter .col-4 {
    padding-top: 42px;
  }

  .page-contact .faq-stack {
    gap: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .chapter__index,
  .page-contact .contact-dl__row,
  .page-contact .faq-fold {
    transition: none;
  }

  .page-contact .contact-dl__row:hover,
  .page-contact .faq-fold:hover {
    transform: none;
    box-shadow: none;
  }
}