.page-contact {
  --contact-panel-pad: clamp(20px, 3.2vw, 38px);
  --contact-stack-gap: 56px;
  display: block;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 22px 16px 76px;
}

/* ---------- 面包屑与首屏声明 ---------- */

.page-contact .crumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--rock);
}

.page-contact .crumbs a {
  color: var(--rock);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

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

.page-contact .crumbs a[aria-current="page"] {
  color: var(--bone);
}

.page-contact .contact-intro {
  max-width: 760px;
  margin-top: 26px;
  margin-bottom: 34px;
}

.page-contact .contact-intro h1 {
  font-size: clamp(28px, 6.2vw, 44px);
  line-height: 1.14;
  letter-spacing: -0.012em;
  font-weight: 800;
  color: var(--bone);
  margin: 12px 0 16px;
}

.page-contact .contact-intro .lede {
  max-width: 66ch;
  color: var(--rock);
}

/* ---------- 玻璃联络卡 ---------- */

.page-contact .contact-board {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border: 1px solid var(--line-cyan);
  border-radius: 18px;
  background: var(--glass);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow-panel);
  margin-bottom: var(--contact-stack-gap);
}

.page-contact .contact-board__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 62% 42%;
  opacity: 0.52;
  filter: saturate(0.85) contrast(1.06);
}

.page-contact .contact-board__veil {
  position: absolute;
  inset: 0;
  z-index: 1;
  background-image:
    repeating-linear-gradient(115deg, rgba(53, 242, 214, 0.07) 0 1px, transparent 1px 28px),
    linear-gradient(158deg, rgba(11, 16, 32, 0.42) 0%, rgba(5, 7, 15, 0.9) 64%);
}

.page-contact .contact-board__inner {
  position: relative;
  z-index: 2;
  padding: var(--contact-panel-pad);
}

.page-contact .contact-board__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 24px;
}

.page-contact .contact-board__idx {
  color: var(--cyan);
  font-size: clamp(36px, 8vw, 58px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.02em;
}

@supports (-webkit-text-stroke: 1px red) {
  .page-contact .contact-board__idx {
    color: transparent;
    -webkit-text-stroke: 1px var(--cyan);
  }
}

.page-contact .contact-board__title {
  font-size: clamp(19px, 3.4vw, 24px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--bone);
  margin: 0;
}

/* ---------- 渠道列表 ---------- */

.page-contact .channels {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-contact .channel {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 18px 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(11, 16, 32, 0.66);
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-contact .channel:hover {
  border-color: var(--line-cyan);
  background: rgba(19, 28, 51, 0.78);
}

.page-contact .channel--mail { border-left: 3px solid var(--cyan); }
.page-contact .channel--phone { border-left: 3px solid var(--orange); }
.page-contact .channel--addr { border-left: 3px solid var(--moss); }

.page-contact .channel__key {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--rock);
}

.page-contact .channel__val {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--bone);
  word-break: break-word;
}

.page-contact .channel__val--mail {
  word-break: break-all;
  color: var(--cyan);
  text-shadow: 0 0 1px rgba(53, 242, 214, 0.55);
}

.page-contact .channel__val--addr {
  font-size: 14px;
  line-height: 1.65;
}

.page-contact .channel__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--rock);
}

.page-contact .copybtn {
  align-self: flex-start;
  margin-top: auto;
  padding: 6px 15px;
  border: 1px solid var(--orange);
  border-radius: 999px;
  background: transparent;
  color: var(--orange);
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease),
    background-color 0.18s var(--ease);
}

.page-contact .copybtn:hover,
.page-contact .copybtn:focus-visible {
  background: rgba(255, 122, 41, 0.14);
}

.page-contact .copybtn[data-copied] {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(53, 242, 214, 0.12);
}

/* ---------- 章节通用节奏 ---------- */

.page-contact .chapter {
  margin-top: var(--contact-stack-gap);
}

.page-contact .chapter__head {
  max-width: 700px;
  margin-bottom: 26px;
}

.page-contact .grid {
  gap: 22px;
}

/* ---------- 勘误清单 ---------- */

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

.page-contact .check {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--line-soft);
  border-radius: 12px;
  background: rgba(19, 28, 51, 0.55);
  cursor: pointer;
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-contact .check:hover {
  border-color: var(--line-cyan);
  background: rgba(19, 28, 51, 0.78);
}

.page-contact .check:has(.check__box:checked) {
  border-color: var(--line-cyan);
  background: rgba(53, 242, 214, 0.07);
}

.page-contact .check__box {
  appearance: none;
  -webkit-appearance: none;
  flex: 0 0 auto;
  position: relative;
  width: 18px;
  height: 18px;
  margin: 2px 0 0;
  border: 1px solid var(--rock);
  border-radius: 5px;
  background: rgba(5, 7, 15, 0.65);
  cursor: pointer;
  transition: border-color 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

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

.page-contact .check__box:checked {
  border-color: var(--cyan);
  box-shadow: 0 0 0 1px rgba(53, 242, 214, 0.35);
}

.page-contact .check__box:checked::after {
  content: "";
  position: absolute;
  inset: 3px;
  border-radius: 2px;
  background: var(--cyan);
}

.page-contact .check__text {
  font-size: 14px;
  line-height: 1.72;
  color: var(--rock);
  transition: color 0.18s var(--ease);
}

.page-contact .check__text strong {
  display: block;
  margin-bottom: 2px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--bone);
}

.page-contact .check__box:checked + .check__text {
  color: var(--bone);
}

/* ---------- 勘误侧栏 ---------- */

.page-contact .errata-aside {
  padding: 22px 22px 24px;
  border-radius: 14px;
  border-top: 3px solid var(--clay);
}

.page-contact .errata-aside__title {
  margin: 0 0 14px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.005em;
  color: var(--bone);
}

.page-contact .errata-aside__list {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 10px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--rock);
}

.page-contact .errata-aside__list li::marker {
  color: var(--clay);
  font-family: var(--font-mono);
}

.page-contact .errata-aside__foot {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 13px;
  line-height: 1.7;
  color: var(--rock);
}

/* ---------- 合作方向 ---------- */

.page-contact .coop-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

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

.page-contact .coop-item {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: linear-gradient(118deg, rgba(19, 28, 51, 0.92), rgba(11, 16, 32, 0.72));
  outline: none;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-contact .coop-item:hover,
.page-contact .coop-item:focus-visible {
  border-color: var(--line-cyan);
  transform: translateX(4px);
}

.page-contact .coop-item__title {
  margin: 0;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.005em;
  color: var(--bone);
}

.page-contact .coop-item__reveal {
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 14px;
  line-height: 1.72;
  color: var(--rock);
  transition: max-height 0.28s var(--ease), opacity 0.22s var(--ease),
    margin-top 0.28s var(--ease);
}

.page-contact .coop-item:hover .coop-item__reveal,
.page-contact .coop-item:focus-visible .coop-item__reveal {
  max-height: 160px;
  opacity: 1;
  margin-top: 8px;
}

@media (hover: none) {
  .page-contact .coop-item__reveal {
    max-height: 200px;
    opacity: 1;
    margin-top: 8px;
  }
}

.page-contact .coop-media {
  border-radius: 14px;
  overflow: hidden;
}

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

.page-contact .coop-media .media__caption {
  font-size: 12px;
  line-height: 1.6;
  color: var(--rock);
}

/* ---------- 处理流程时间轴 ---------- */

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

.page-contact .flowline__step {
  position: relative;
  margin-left: 9px;
  padding: 0 0 28px 34px;
  border-left: 1px solid var(--line);
}

.page-contact .flowline__step:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-contact .flowline__step::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 5px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
}

.page-contact .flowline__step--warm::before {
  border-color: var(--orange);
}

.page-contact .flowline__step--hot::before {
  border-color: var(--magenta);
}

.page-contact .flowline__label {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--bone);
}

.page-contact .flowline__idx {
  font-size: 13px;
  font-weight: 700;
  color: var(--cyan);
}

.page-contact .flowline__step--warm .flowline__idx { color: var(--orange); }
.page-contact .flowline__step--hot .flowline__idx { color: var(--magenta); }

.page-contact .flowline__desc {
  margin: 0;
  max-width: 68ch;
  font-size: 14px;
  line-height: 1.78;
  color: var(--rock);
}

/* ---------- 渠道边界 ---------- */

.page-contact .scope-card {
  height: 100%;
  padding: 20px 20px 22px;
  border: 1px solid var(--line);
  border-top-width: 3px;
  border-radius: 14px;
  background: linear-gradient(150deg, rgba(19, 28, 51, 0.86), rgba(11, 16, 32, 0.66));
}

.page-contact .scope-card--mail { border-top-color: var(--cyan); }
.page-contact .scope-card--phone { border-top-color: var(--orange); }
.page-contact .scope-card--addr { border-top-color: var(--moss); }

.page-contact .scope-card h3 {
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--bone);
}

.page-contact .scope-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--rock);
}

/* ---------- 相关栏目 ---------- */

.page-contact .contact-more {
  position: relative;
  overflow: hidden;
  margin-top: var(--contact-stack-gap);
  padding: var(--contact-panel-pad);
  border: 1px solid var(--line);
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(19, 28, 51, 0.92), rgba(11, 16, 32, 0.72));
}

.page-contact .contact-more::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: linear-gradient(90deg, var(--cyan), var(--orange) 55%, var(--magenta));
  opacity: 0.82;
}

.page-contact .contact-more__title {
  margin: 0;
  font-size: clamp(20px, 3.6vw, 24px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--bone);
}

.page-contact .contact-more__list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-contact .contact-more__list li {
  padding-left: 14px;
  border-left: 2px solid var(--line-cyan);
}

.page-contact .contact-more__list a {
  display: inline-block;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cyan);
  text-decoration: none;
  transition: color 0.16s var(--ease);
}

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

.page-contact .contact-more__list span {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--rock);
}

/* ---------- 响应式 ---------- */

@media (min-width: 560px) {
  .page-contact .channels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-contact .contact-more__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 28px;
  }
}

@media (min-width: 820px) {
  .page-contact {
    padding: 32px 32px 96px;
  }

  .page-contact .channels {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-contact .coop-item:nth-child(2) {
    margin-left: 26px;
    margin-right: 6px;
  }

  .page-contact .coop-item:nth-child(3) {
    margin-left: 10px;
    margin-right: 24px;
  }
}

@media (min-width: 980px) {
  .page-contact {
    padding: 40px 44px 104px;
  }

  .page-contact .contact-intro {
    margin-top: 32px;
    margin-bottom: 44px;
  }

  .page-contact .coop-layout {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: start;
    gap: 34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .coop-item:hover,
  .page-contact .coop-item:focus-visible {
    transform: none;
  }
}
</main>