.page-contact {
  position: relative;
  background-color: var(--c-fir);
  color: var(--c-chalk);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  overflow-x: hidden;
}

/* ---------- 顶部：面包屑 + 章节索引 ---------- */
.page-contact .contact-topbar {
  background: rgba(6, 23, 19, .72);
  border-bottom: 1px solid var(--line);
}

.page-contact .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: clamp(16px, 2.6vw, 26px) 0 10px;
  font-size: 13px;
  letter-spacing: .03em;
  color: var(--c-mute);
}

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

.page-contact .breadcrumb a:hover {
  text-decoration: underline;
}

.page-contact .chapter-index {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: clamp(12px, 2vw, 18px);
  scrollbar-width: none;
}

.page-contact .chapter-index::-webkit-scrollbar {
  display: none;
}

.page-contact .chapter-link {
  flex: 0 0 auto;
  padding: 6px 14px;
  border: 1px solid var(--line-2);
  border-radius: var(--pill);
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--c-mute);
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-contact .chapter-link:hover {
  color: var(--c-cyan-white);
  border-color: var(--c-cyan);
}

.page-contact .chapter-link.is-active {
  background: var(--c-cyan);
  border-color: var(--c-cyan);
  color: var(--ink-on-cyan);
}

/* ---------- 首屏 ---------- */
.page-contact .contact-hero {
  display: grid;
  gap: clamp(16px, 2.6vw, 24px);
  padding: clamp(32px, 5.5vw, 68px) 0 clamp(36px, 5vw, 64px);
  max-width: 1020px;
}

.page-contact .eyebrow {
  margin: 0;
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: .28em;
  color: var(--c-amber);
}

.page-contact h1 {
  margin: 0;
  max-width: 20ch;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(29px, 5.2vw, 56px);
  line-height: 1.08;
  letter-spacing: -.02em;
}

.page-contact .lede {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(16px, 1.7vw, 19px);
  line-height: 1.78;
  color: var(--c-chalk);
  opacity: .88;
}

.page-contact .hero-facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px 28px;
  margin: clamp(6px, 1.6vw, 16px) 0 0;
  padding: clamp(16px, 2.4vw, 24px) 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.page-contact .hero-facts li {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-contact .hero-facts .num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(24px, 3.4vw, 36px);
  line-height: 1;
  letter-spacing: .01em;
  color: var(--c-cyan);
}

.page-contact .fact-label {
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--c-mute);
}

/* ---------- 通用章节 ---------- */
.page-contact .contact-section {
  position: relative;
  padding: clamp(44px, 7vw, 96px) 0;
}

.page-contact .contact-section--alt {
  background: linear-gradient(180deg, rgba(14, 42, 36, .78), rgba(6, 23, 19, .92));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-contact .contact-section--indigo {
  background: linear-gradient(160deg, rgba(58, 42, 107, .82), rgba(6, 23, 19, .94));
  border-top: 1px solid rgba(43, 231, 200, .18);
  border-bottom: 1px solid rgba(43, 231, 200, .18);
}

.page-contact .section-head {
  display: grid;
  gap: 10px 28px;
  margin-bottom: clamp(24px, 3.6vw, 44px);
}

.page-contact .chapter-number {
  display: block;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(52px, 9vw, 108px);
  line-height: .78;
  letter-spacing: .02em;
  color: rgba(43, 231, 200, .14);
  -webkit-text-stroke: 1px rgba(43, 231, 200, .48);
  user-select: none;
}

.page-contact .section-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(22px, 3.2vw, 35px);
  line-height: 1.16;
  letter-spacing: -.015em;
}

.page-contact .section-head-text .muted {
  margin: 10px 0 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.72;
  color: var(--c-mute);
}

.page-contact .section-foot {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 72ch;
  font-size: 15px;
  color: var(--c-mute);
}

.page-contact .section-foot a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 231, 200, .38);
}

.page-contact .section-foot a:hover {
  border-bottom-color: var(--c-cyan);
}

/* ---------- 图片容器 ---------- */
.page-contact .media-frame {
  position: relative;
  margin: 0 0 clamp(24px, 3.4vw, 40px);
  border: 1px solid var(--line);
  overflow: hidden;
  background: var(--c-fir-2);
}

.page-contact .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  filter: saturate(.72) contrast(1.05);
}

.page-contact .media-frame__caption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-mute);
}

/* ---------- 01 渠道 ---------- */
.page-contact .channel-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2.2vw, 22px);
}

.page-contact .channel-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(14, 42, 36, .82), rgba(6, 23, 19, .88));
  overflow-wrap: anywhere;
  transition: border-color .25s var(--ease), transform .25s var(--ease);
}

.page-contact .channel-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 38px;
  height: 1px;
  background: var(--c-cyan);
}

.page-contact .channel-card:hover {
  border-color: rgba(43, 231, 200, .55);
  transform: translateY(-1px);
}

.page-contact .channel-icon {
  width: 40px;
  height: 40px;
  fill: none;
  stroke: var(--c-cyan);
  stroke-width: 1.25;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.page-contact .channel-label {
  margin: 0;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .24em;
  color: var(--c-amber);
}

.page-contact .channel-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.4;
  color: var(--c-chalk);
}

.page-contact .channel-value {
  margin: 0;
  font-family: var(--font-num);
  font-size: clamp(17px, 2.1vw, 22px);
  line-height: 1.4;
  letter-spacing: .01em;
  color: var(--c-cyan-white);
}

.page-contact .channel-value a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 231, 200, .45);
}

.page-contact .channel-value a:hover {
  border-bottom-color: var(--c-cyan);
}

.page-contact .channel-value--text {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.72;
  color: var(--c-chalk);
}

.page-contact .channel-note {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--c-mute);
}

.page-contact .channel-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: auto;
  padding-top: 6px;
}

.page-contact .copy-btn {
  min-height: 34px;
  padding: 0 15px;
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: .02em;
}

/* ---------- 02 咨询分类 ---------- */
.page-contact .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(18px, 2.6vw, 28px);
}

.page-contact .filter-btn {
  padding: 8px 15px;
  border: 1px solid var(--line-2);
  border-radius: var(--pill);
  background: transparent;
  color: var(--c-mute);
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: .02em;
  cursor: pointer;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-contact .filter-btn:hover {
  color: var(--c-cyan);
  border-color: rgba(43, 231, 200, .55);
}

.page-contact .filter-btn.is-active {
  background: var(--c-cyan);
  border-color: var(--c-cyan);
  color: var(--ink-on-cyan);
  font-weight: 600;
}

.page-contact .advice-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2vw, 20px);
}

.page-contact .advice-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(18px, 2.6vw, 28px);
  border: 1px solid var(--line-2);
  border-left: 2px solid var(--c-cyan);
  background: rgba(14, 42, 36, .58);
  transition: border-color .25s var(--ease), background-color .25s var(--ease);
}

.page-contact .advice-card:hover {
  border-color: rgba(43, 231, 200, .5);
  border-left-color: var(--c-amber);
  background: rgba(14, 42, 36, .88);
}

.page-contact .advice-card h3 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -.005em;
  color: var(--c-chalk);
}

.page-contact .advice-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.74;
  color: rgba(238, 243, 241, .84);
}

.page-contact .prep-list {
  display: grid;
  gap: 6px;
  margin: 0;
  padding: 12px 0 0;
  border-top: 1px dashed var(--line-2);
  list-style: none;
}

.page-contact .prep-list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.64;
  color: var(--c-mute);
}

.page-contact .prep-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 7px;
  height: 1px;
  background: var(--c-cyan);
}

.page-contact .is-hidden {
  display: none !important;
}

/* ---------- 03 回复节奏 ---------- */
.page-contact .pace-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 2.6vw, 26px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-contact .pace-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.page-contact .pace-num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(28px, 4.4vw, 50px);
  line-height: 1;
  letter-spacing: .01em;
  color: var(--c-amber);
}

.page-contact .pace-unit {
  margin-left: .28em;
  font-size: .46em;
  letter-spacing: .06em;
  color: var(--c-amber);
  opacity: .8;
}

.page-contact .pace-label {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 15px;
  color: var(--c-chalk);
}

.page-contact .pace-detail {
  margin: 0;
  max-width: 46ch;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--c-mute);
}

/* ---------- 04 协作流程 ---------- */
.page-contact .flow-list {
  position: relative;
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-contact .flow-list::before {
  content: "";
  position: absolute;
  left: 17px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-cyan), var(--c-orange) 58%, rgba(43, 231, 200, .16));
}

.page-contact .flow-step {
  position: relative;
  display: grid;
  gap: 8px;
  padding-left: clamp(48px, 7vw, 68px);
  outline: none;
}

.page-contact .flow-step h3 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.4;
  color: var(--c-chalk);
}

.page-contact .flow-step > p {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.74;
  color: rgba(238, 243, 241, .84);
}

.page-contact .flow-index {
  position: absolute;
  left: 0;
  top: 0;
  display: grid;
  place-items: center;
  width: 35px;
  height: 35px;
  border: 1px solid var(--c-cyan);
  border-radius: 50%;
  background: var(--c-fir);
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--c-cyan);
  transition: border-color .25s var(--ease), color .25s var(--ease), box-shadow .25s var(--ease);
}

.page-contact .flow-detail {
  margin: 0;
  max-width: 60ch;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--c-mute);
}

.page-contact .flow-step:hover .flow-index,
.page-contact .flow-step:focus-within .flow-index {
  border-color: var(--c-orange);
  color: var(--c-orange);
  box-shadow: 0 0 0 4px rgba(255, 122, 61, .14);
}

/* ---------- 05 站点信息 ---------- */
.page-contact .site-mosaic {
  position: relative;
  border: 1px solid var(--line);
  overflow: hidden;
  background: var(--c-fir-2);
}

.page-contact .site-mosaic img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  opacity: .26;
  filter: saturate(.55) hue-rotate(115deg);
}

.page-contact .site-mosaic-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  padding: clamp(24px, 4.6vw, 60px);
}

.page-contact .site-facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2.2vw, 22px);
  margin: 0;
}

.page-contact .site-fact {
  display: grid;
  gap: 6px;
  padding-top: 14px;
  border-top: 1px solid rgba(124, 154, 147, .3);
}

.page-contact .site-fact dt {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--c-mute);
}

.page-contact .site-fact dd {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--c-chalk);
  overflow-wrap: anywhere;
}

.page-contact .site-note {
  margin: 0;
  max-width: 74ch;
  font-size: 14px;
  line-height: 1.78;
  color: var(--c-mute);
}

.page-contact .site-note a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 231, 200, .35);
}

.page-contact .site-note a:hover {
  border-bottom-color: var(--c-cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-contact .hero-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-contact .pace-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 980px) {
  .page-contact .section-head {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: end;
  }

  .page-contact .chapter-number {
    padding-right: clamp(18px, 3vw, 40px);
  }

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

  .page-contact .flow-step {
    padding-left: 72px;
  }
}

@media (min-width: 1180px) {
  .page-contact .site-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (hover: hover) and (min-width: 980px) {
  .page-contact .flow-detail {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height .4s var(--ease), opacity .3s var(--ease), margin-top .3s var(--ease);
  }

  .page-contact .flow-step:hover .flow-detail,
  .page-contact .flow-step:focus-within .flow-detail {
    max-height: 200px;
    opacity: 1;
    margin-top: 2px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact * {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }

  .page-contact .channel-card:hover {
    transform: none;
  }
}