.page-contact {
  padding-top: clamp(24px, 4vw, 44px);
  padding-bottom: clamp(64px, 10vw, 132px);
}

.page-contact .breadcrumb {
  margin-bottom: clamp(22px, 4vw, 38px);
}

/* ---------- 首屏：无 Hero，直接给目录与声明 ---------- */
.page-contact .pc-intro {
  max-width: 74ch;
  padding-bottom: clamp(8px, 2vw, 18px);
}

.page-contact .pc-eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-contact h1 {
  margin: 0 0 20px;
  font-size: clamp(30px, 6.2vw, 54px);
  line-height: 1.14;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-contact .pc-lead {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(16px, 1.9vw, 18.5px);
  line-height: 1.85;
  color: var(--mist);
}

.page-contact .pc-index {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin: 28px 0 0;
  padding: 16px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-contact .pc-index a {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

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

/* ---------- 章节公共间距 ---------- */
.page-contact .pc-block {
  margin-top: clamp(56px, 9vw, 110px);
}

.page-contact .pc-note {
  margin: 24px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 01 渠道网格：印刷线框 ---------- */
.page-contact .channel-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(24px, 4vw, 40px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-contact .channel-cell {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  padding: clamp(20px, 3.2vw, 32px);
  background: var(--ink-2);
}

.page-contact .channel-cell--mail {
  background: linear-gradient(158deg, var(--wine) 0%, #2A1030 48%, var(--ink-2) 100%);
}

.page-contact .cell-key {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--label);
  opacity: 0.82;
}

.page-contact .cell-value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(18px, 3vw, 26px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper);
  word-break: break-word;
}

.page-contact .cell-value--mail {
  font-size: clamp(16px, 2.5vw, 25px);
  word-break: break-all;
  color: #FFFFFF;
}

.page-contact .cell-note {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-contact .channel-cell--mail .cell-note {
  color: #D8CFE4;
}

.page-contact .channel-cell .copy-btn {
  margin-top: 6px;
}

/* ---------- 02 勘误流程 ---------- */
.page-contact .step-list {
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-contact .step {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 24px 0 26px 16px;
  border-bottom: 1px solid var(--line);
  border-left: 3px solid transparent;
  transition: border-color 0.25s ease, background-color 0.25s ease;
}

.page-contact .step:hover {
  border-left-color: var(--orange);
  background: rgba(255, 106, 43, 0.04);
}

.page-contact .step-no {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-contact .step-title {
  margin: 0;
  font-size: clamp(17px, 2.2vw, 20px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-contact .step-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-contact .pc-figure {
  margin: clamp(28px, 4vw, 46px) 0 0;
}

.page-contact .pc-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: var(--ink-2);
  object-fit: cover;
}

.page-contact .pc-figure .media-caption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 03 反馈分类筛选 ---------- */
.page-contact .filter-bar {
  margin-top: clamp(22px, 3vw, 34px);
}

.page-contact .filter-live {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--mist);
}

.page-contact .fb-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 22px;
}

.page-contact .fb-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
  padding: 22px 22px 24px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--indigo);
  background: var(--ink-2);
  scroll-margin-top: 84px;
  transition: opacity 0.25s ease, transform 0.25s ease, border-top-color 0.25s ease;
}

.page-contact .fb-item:hover {
  border-top-color: var(--cyan);
}

.page-contact .fb-item[hidden] {
  display: none;
}

.page-contact .fb-item.is-hidden {
  opacity: 0;
  transform: translateY(8px);
}

.page-contact .fb-title {
  margin: 0;
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.page-contact .fb-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 04 写作建议 ---------- */
.page-contact .write-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 40px);
  margin-top: clamp(24px, 4vw, 40px);
}

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

.page-contact .write-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-contact .write-key {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-contact .write-val {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--paper);
}

.page-contact .write-aside {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
  padding: clamp(22px, 3.5vw, 32px);
  background: var(--label);
  color: var(--ink);
  border-left: 6px solid var(--indigo);
}

.page-contact .aside-tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--wine);
}

.page-contact .aside-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: #1B2440;
}

.page-contact .write-aside .btn-ghost {
  border-color: var(--wine);
  color: var(--wine);
}

/* ---------- 05 服务范围 ---------- */
.page-contact .scope-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(24px, 4vw, 40px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-contact .scope-item {
  padding: clamp(20px, 3vw, 28px);
  background: var(--ink-2);
}

.page-contact .scope-num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: clamp(34px, 6vw, 58px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-contact .scope-label {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-contact .prose {
  margin-top: clamp(24px, 4vw, 36px);
  max-width: 68ch;
}

.page-contact .prose p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--mist);
}

.page-contact .prose p:last-child {
  margin-bottom: 0;
}

.page-contact .prose a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 224, 214, 0.4);
}

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

/* ---------- 06 备案 ---------- */
.page-contact .filing-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3.5vw, 34px);
  margin-top: clamp(24px, 4vw, 40px);
}

.page-contact .filing-card {
  position: relative;
  padding: clamp(24px, 4vw, 40px);
  background: var(--label);
  border-left: 6px solid var(--orange);
  background-image: repeating-linear-gradient(
    to bottom,
    rgba(7, 11, 28, 0.05) 0px,
    rgba(7, 11, 28, 0.05) 1px,
    transparent 1px,
    transparent 28px
  );
}

.page-contact .filing-label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--wine);
}

.page-contact .filing-code {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: clamp(23px, 4.6vw, 42px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--ink);
  word-break: break-all;
}

.page-contact .filing-text {
  margin: 0;
  max-width: 46ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: #252E4C;
}

.page-contact .pc-figure--filing {
  margin: 0;
}

/* ---------- 断点：≥ 720px ---------- */
@media (min-width: 720px) {
  .page-contact .fb-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-contact .write-row {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }

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

  .page-contact .step {
    grid-template-columns: 86px minmax(0, 1fr);
    grid-template-rows: auto auto;
    gap: 0 22px;
    padding: 26px 0 28px 22px;
  }

  .page-contact .step-no {
    grid-column: 1;
    grid-row: 1 / span 2;
    font-size: 14px;
  }

  .page-contact .step-title {
    grid-column: 2;
    grid-row: 1;
  }

  .page-contact .step-text {
    grid-column: 2;
    grid-row: 2;
    margin-top: 8px;
  }
}

/* ---------- 断点：≥ 1024px ---------- */
@media (min-width: 1024px) {
  .page-contact .channel-grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    grid-template-rows: auto auto auto;
  }

  .page-contact .channel-cell--mail {
    grid-column: 1;
    grid-row: 1 / span 3;
    justify-content: center;
  }

  .page-contact .fb-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-contact .write-split {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
    gap: 48px;
  }

  .page-contact .filing-split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: center;
    gap: 48px;
  }
}

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-contact .fb-item,
  .page-contact .step,
  .page-contact .pc-index a {
    transition: none;
  }
}