/* ===== 联系入口 · 页面作用域 ===== */
.page-contact {
  --pc-grid-line: rgba(58, 63, 75, .6);
  --pc-route-bg: linear-gradient(180deg, rgba(122, 59, 255, .08), rgba(7, 7, 12, 0) 62%);
  --pc-fs: .95rem;
  overflow-wrap: break-word;
}

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

.page-contact__crumbs {
  padding-block: 20px 4px;
}

/* ---------- 首屏 ---------- */
.page-contact .contact-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background-image:
    linear-gradient(var(--pc-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--pc-grid-line) 1px, transparent 1px);
  background-size: 56px 56px;
  background-position: center top;
  border-bottom: 1px solid var(--pc-grid-line);
}

.page-contact .contact-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(90% 70% at 12% 0%, rgba(25, 227, 209, .12), transparent 62%),
    radial-gradient(70% 60% at 88% 8%, rgba(122, 59, 255, .18), transparent 66%),
    linear-gradient(180deg, rgba(7, 7, 12, .4) 0%, rgba(7, 7, 12, .94) 78%);
}

.page-contact .contact-hero__inner {
  display: grid;
  gap: 40px;
  padding-block: 40px 56px;
  align-items: end;
}

.page-contact .contact-hero__title {
  margin: 14px 0 0;
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.9rem, 7.4vw, 4rem);
  line-height: 1.02;
  letter-spacing: -.02em;
  color: var(--read);
}

.page-contact .contact-hero__lead {
  margin: 20px 0 0;
  max-width: 62ch;
  color: var(--read-70);
  line-height: 1.75;
}

.page-contact .contact-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 20px 40px;
  margin: 32px 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid var(--pc-grid-line);
}

.page-contact .contact-hero__stats .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-contact .contact-hero__stats .stat__value {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  letter-spacing: .02em;
  color: var(--gold);
}

.page-contact .contact-hero__stats .stat__label {
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--read-45);
}

.page-contact .contact-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-contact .media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--pc-grid-line);
  border-radius: var(--radius);
  background: var(--ink-2);
}

.page-contact .media-frame > img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-width: 100%;
}

.page-contact .contact-hero__frame {
  aspect-ratio: 3 / 2;
  border-color: var(--violet-line);
}

.page-contact .contact-hero__frame::before,
.page-contact .contact-hero__frame::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  border: 1px solid var(--cyan);
  z-index: 2;
}

.page-contact .contact-hero__frame::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-contact .contact-hero__frame::after {
  right: -1px;
  bottom: -1px;
  border-top: 0;
  border-left: 0;
}

/* ---------- 事由分流 ---------- */
.page-contact .contact-desk {
  display: grid;
  gap: 40px;
  margin-top: 40px;
}

.page-contact .contact-desk__rail {
  display: grid;
  gap: 28px;
  align-content: start;
}

.page-contact .contact-index {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--pc-grid-line);
}

.page-contact .contact-index__item {
  border-bottom: 1px solid var(--pc-grid-line);
}

.page-contact .contact-index__link {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 13px 12px;
  border-left: 2px solid transparent;
  color: var(--read-70);
  font-size: var(--pc-fs);
  letter-spacing: .02em;
  text-decoration: none;
  transition: color .16s ease, border-color .16s ease, background-color .16s ease;
}

.page-contact .contact-index__link:hover,
.page-contact .contact-index__link:focus-visible {
  color: var(--read);
  border-left-color: var(--violet);
  background: var(--violet-soft);
}

.page-contact .contact-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-contact .contact-desk__media {
  aspect-ratio: 16 / 9;
}

.page-contact .contact-desk__panels {
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-contact .contact-route {
  background-image: var(--pc-route-bg);
  border-left: 2px solid var(--violet-line);
  padding: 22px 20px 24px;
  scroll-margin-top: 120px;
}

.page-contact .contact-route__meta {
  display: grid;
  gap: 8px;
  list-style: none;
  margin: 16px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--pc-grid-line);
  font-size: var(--pc-fs);
  color: var(--read-70);
}

.page-contact .contact-route__meta > li {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-contact .contact-route__links {
  margin: 16px 0 0;
  font-size: var(--pc-fs);
  line-height: 1.8;
  color: var(--read-70);
}

.page-contact .contact-route__links a,
.page-contact .contact-errata__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(25, 227, 209, .4);
}

.page-contact .contact-route__links a:hover,
.page-contact .contact-errata__note a:hover,
.page-contact .contact-route__links a:focus-visible,
.page-contact .contact-errata__note a:focus-visible {
  color: var(--read);
  border-bottom-color: var(--violet);
}

/* ---------- 直接联络（暖纸章节） ---------- */
.page-contact .section--paper {
  color: var(--paper-ink);
}

.page-contact .contact-channels__grid {
  margin-top: 36px;
  gap: 36px;
}

.page-contact .contact-channel {
  border-top: 2px solid var(--paper-ink);
  padding-top: 16px;
}

.page-contact .contact-channel__value {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(1rem, 4.6vw, 1.45rem);
  letter-spacing: .01em;
  color: var(--paper-ink);
  overflow-wrap: anywhere;
}

.page-contact .contact-channel__use {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: baseline;
  margin: 14px 0 0;
  font-size: var(--pc-fs);
  line-height: 1.75;
}

.page-contact .contact-duty {
  margin-top: 40px;
}

.page-contact .section--paper a {
  color: var(--violet);
  text-decoration: none;
  border-bottom: 1px solid rgba(122, 59, 255, .45);
}

.page-contact .section--paper a:hover,
.page-contact .section--paper a:focus-visible {
  border-bottom-color: var(--paper-ink);
  color: var(--paper-ink);
}

.page-contact .contact-block__value,
.page-contact .contact-block__links a {
  border-bottom-width: 1px;
}

/* ---------- 勘误通道 ---------- */
.page-contact .contact-errata__format {
  margin-top: 36px;
  padding: 20px 20px 22px;
  border: 1px dashed var(--violet-line);
  background: var(--violet-soft);
}

.page-contact .errata-format {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(.95rem, 3.4vw, 1.15rem);
  letter-spacing: .02em;
  color: var(--read);
  overflow-wrap: anywhere;
}

.page-contact .contact-errata__example {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .02em;
  color: var(--read-45);
  overflow-wrap: anywhere;
}

.page-contact .contact-errata__grid {
  margin-top: 40px;
  gap: 40px;
}

.page-contact .contact-errata__subtitle {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: .01em;
  color: var(--read);
}

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

.page-contact .contact-errata__list li {
  position: relative;
  padding: 11px 0 11px 22px;
  border-top: 1px solid var(--pc-grid-line);
  color: var(--read-70);
  font-size: var(--pc-fs);
  line-height: 1.7;
}

.page-contact .contact-errata__list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 20px;
  width: 6px;
  height: 6px;
  background: var(--cyan);
}

.page-contact .contact-errata__note {
  margin: 18px 0 0;
  font-size: var(--pc-fs);
  line-height: 1.75;
  color: var(--read-45);
}

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

.page-contact .errata-steps__item {
  position: relative;
  padding: 16px 0 16px 46px;
  border-top: 1px solid var(--pc-grid-line);
  color: var(--read-70);
  font-size: var(--pc-fs);
  line-height: 1.7;
}

.page-contact .errata-steps__item::before {
  counter-increment: errata;
  content: "0" counter(errata);
  position: absolute;
  left: 0;
  top: 17px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-contact .errata-steps__item::after {
  content: "";
  position: absolute;
  left: 0;
  top: -4px;
  width: 8px;
  height: 8px;
  background: var(--gold);
}

/* ---------- 授权与到访 ---------- */
.page-contact .contact-license__grid {
  margin-top: 36px;
  gap: 40px;
}

.page-contact .contact-block {
  border-top: 2px solid var(--paper-ink);
  padding-top: 18px;
}

.page-contact .contact-block__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 1.25rem;
  letter-spacing: .01em;
  color: var(--paper-ink);
}

.page-contact .contact-block__value {
  margin: 12px 0;
  padding: 10px 12px;
  border-left: 2px solid var(--violet);
  background: rgba(26, 26, 34, .06);
  font-family: var(--font-mono);
  font-size: var(--pc-fs);
  line-height: 1.7;
  overflow-wrap: anywhere;
}

.page-contact .contact-block__list {
  margin: 12px 0 0;
  padding-left: 1.15em;
  line-height: 1.8;
}

.page-contact .contact-block__list li {
  margin-bottom: 6px;
}

.page-contact .contact-block__links {
  margin: 16px 0 0;
  font-size: var(--pc-fs);
  line-height: 1.8;
}

.page-contact .visit-note {
  margin-top: 20px;
  border: 1px solid rgba(26, 26, 34, .26);
  border-radius: var(--radius);
}

.page-contact .visit-note > summary {
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-size: var(--pc-fs);
  color: var(--paper-ink);
}

.page-contact .visit-note > summary::-webkit-details-marker {
  display: none;
}

.page-contact .visit-note > summary::after {
  content: "＋";
  font-family: var(--font-mono);
  color: var(--violet);
}

.page-contact .visit-note[open] > summary::after {
  content: "－";
}

.page-contact .visit-note__body {
  padding: 0 16px 16px;
  font-size: var(--pc-fs);
  line-height: 1.75;
}

/* ---------- 备案刻度条 ---------- */
.page-contact .contact-filing {
  border-top: 1px solid var(--pc-grid-line);
}

.page-contact .contact-filing .shell {
  padding-block: 28px 36px;
}

.page-contact .contact-filing__ruler {
  height: 12px;
  background-image: repeating-linear-gradient(90deg, var(--grid) 0 1px, transparent 1px 24px);
  border-bottom: 1px solid var(--pc-grid-line);
}

.page-contact .contact-filing__row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-contact .contact-filing__item {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--read-45);
}

.page-contact .contact-filing__note {
  margin: 18px 0 0;
  max-width: 68ch;
  font-size: .875rem;
  line-height: 1.75;
  color: var(--read-45);
}

/* ---------- 桌面栅格 ---------- */
@media (min-width: 760px) {
  .page-contact .errata-steps {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-contact .errata-steps__item {
    padding: 24px 14px 0 0;
  }

  .page-contact .errata-steps__item::before {
    position: static;
    display: block;
    margin-bottom: 10px;
    top: auto;
  }
}

@media (min-width: 900px) {
  .page-contact .contact-hero__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 56px;
    padding-block: 64px 88px;
  }

  .page-contact .contact-desk {
    grid-template-columns: 264px minmax(0, 1fr);
    gap: 48px;
  }

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

  .page-contact .contact-route {
    padding: 26px 28px 28px;
  }

  .page-contact .contact-channels__grid {
    grid-template-columns: 1.05fr .95fr;
    gap: 48px;
  }

  .page-contact .contact-errata__grid {
    grid-template-columns: .9fr 1.1fr;
    gap: 56px;
  }

  .page-contact .contact-license__grid {
    grid-template-columns: 1fr 1fr;
    gap: 56px;
  }
}

@media (max-width: 520px) {
  .page-contact .contact-hero__stats {
    gap: 16px 24px;
  }

  .page-contact .contact-hero__actions .btn {
    width: 100%;
    text-align: center;
  }

  .page-contact .contact-route {
    padding: 18px 16px 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .contact-index__link {
    transition: none;
  }
}