.page-faq {
  --faq-line: 1px solid var(--ink-600);
  --faq-num: 56px;
  --faq-offset: 104px;
  display: block;
  padding-bottom: 88px;
  font-family: var(--font-body);
  color: var(--gry-300);
}

.page-faq a {
  color: var(--cy-200);
  text-decoration: none;
  border-bottom: 1px solid var(--ink-600);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-faq a:hover {
  color: var(--cy-500);
  border-bottom-color: var(--cy-500);
}

.page-faq a:focus-visible,
.page-faq .step__box:focus-visible {
  outline: 1px solid var(--cy-500);
  outline-offset: 2px;
}

.page-faq .breadcrumb {
  padding: 20px 0 0;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding: 28px 0 24px;
  border-bottom: var(--faq-line);
}

.page-faq .faq-hero .eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--or-500);
}

.page-faq .faq-hero h1 {
  margin: 0 0 16px;
  max-width: 22em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 28px;
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--paper-100);
}

.page-faq .faq-hero__lead {
  margin: 0 0 24px;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.75;
  letter-spacing: 0.01em;
}

.page-faq .faq-hero__facts {
  display: flex;
  flex-wrap: wrap;
  margin: 0;
  padding: 16px 0 0;
  list-style: none;
  border-top: var(--faq-line);
}

.page-faq .faq-hero__facts li {
  padding-right: 20px;
  margin-right: 20px;
  border-right: var(--faq-line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gry-500);
}

.page-faq .faq-hero__facts li:last-child {
  border-right: 0;
  padding-right: 0;
  margin-right: 0;
}

.page-faq .faq-hero__facts .mono {
  display: block;
  margin-bottom: 2px;
  font-size: 20px;
  letter-spacing: -0.02em;
  color: var(--cy-500);
}

/* ---------- 媒体 ---------- */
.page-faq .media {
  margin: 28px 0;
}

.page-faq .media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--ink-800);
  border: var(--faq-line);
}

.page-faq .media__cap {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--gry-500);
}

/* ---------- 章节索引 ---------- */
.page-faq .faq-index {
  padding: 8px 0 32px;
  border-bottom: var(--faq-line);
  scroll-margin-top: var(--faq-offset);
}

.page-faq .faq-index ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-index a {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 13px 8px;
  border-bottom: var(--faq-line);
  font-size: 14px;
  color: var(--gry-300);
}

.page-faq .faq-index a:hover {
  background: var(--ink-800);
  border-bottom-color: var(--cy-500);
}

.page-faq .faq-index .mono {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gry-500);
}

/* ---------- 章节 ---------- */
.page-faq .chapter {
  padding: 44px 0 36px;
  border-bottom: var(--faq-line);
  scroll-margin-top: var(--faq-offset);
}

.page-faq .chapter__head {
  border-left: 2px solid var(--ink-600);
  padding-left: 16px;
  margin-bottom: 26px;
  transition: border-color var(--dur) var(--ease);
}

.page-faq .chapter:target .chapter__head {
  border-left-color: var(--cy-500);
}

.page-faq .chapter__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--ink-600);
}

.page-faq .chapter:target .chapter__num {
  color: var(--or-500);
}

.page-faq .chapter h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 21px;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--paper-100);
}

.page-faq .chapter__intro {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--gry-300);
}

.page-faq .chapter__sum {
  margin: 26px 0 0;
  padding: 10px 0 10px 14px;
  border-left: 2px solid var(--cy-500);
  font-size: 14px;
  line-height: 1.7;
  color: var(--cy-200);
}

.page-faq .chapter__note {
  margin: 24px 0 0;
  padding: 14px 16px;
  border: var(--faq-line);
  border-left: 2px solid var(--or-500);
  background: var(--ink-800);
}

.page-faq .chapter__note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
}

.page-faq .note__label {
  display: inline-block;
  margin-right: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--or-500);
}

/* ---------- 步骤 ---------- */
.page-faq .steps {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .step {
  display: grid;
  grid-template-columns: 18px 1fr;
  gap: 12px;
  padding: 18px 0;
  border-top: var(--faq-line);
}

.page-faq .step__box {
  appearance: none;
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  margin: 3px 0 0;
  border: 1px solid var(--gry-500);
  background: var(--ink-900);
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .step__box:hover {
  border-color: var(--cy-500);
}

.page-faq .step__box:checked {
  background: var(--cy-500);
  border-color: var(--cy-500);
}

.page-faq .step__body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  cursor: pointer;
}

.page-faq .step__n {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gry-500);
}

.page-faq .step__title {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 17px;
  line-height: 1.35;
  letter-spacing: 0.01em;
  color: var(--cy-200);
  transition: color var(--dur) var(--ease);
}

.page-faq .step__text {
  display: block;
  font-size: 15px;
  line-height: 1.75;
  color: var(--gry-300);
}

.page-faq .step__box:checked ~ .step__body .step__title {
  color: var(--gry-500);
  text-decoration: line-through;
  text-decoration-color: var(--ink-600);
}

/* ---------- 时间线 ---------- */
.page-faq .timeline {
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--ink-600);
}

.page-faq .timeline__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 16px 0 16px 18px;
  border-bottom: var(--faq-line);
}

.page-faq .timeline__item:last-child {
  border-bottom: 0;
}

.page-faq .timeline__time {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--or-500);
}

.page-faq .timeline__body {
  font-size: 15px;
  line-height: 1.75;
  color: var(--gry-300);
}

/* ---------- 维度表 ---------- */
.page-faq .table-wrap {
  margin: 26px 0 0;
  border: var(--faq-line);
  overflow-x: auto;
}

.page-faq .dim-table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-faq .dim-table caption {
  padding: 12px 14px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gry-500);
  border-bottom: var(--faq-line);
}

.page-faq .dim-table th {
  padding: 10px 14px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--gry-500);
  border-bottom: 1px solid var(--cy-500);
  white-space: nowrap;
}

.page-faq .dim-table td {
  padding: 12px 14px;
  border-bottom: var(--faq-line);
  line-height: 1.6;
  vertical-align: top;
}

.page-faq .dim-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-faq .dim-table tbody tr:hover {
  background: var(--ink-800);
}

.page-faq .dim-table td:first-child {
  color: var(--cy-500);
  white-space: nowrap;
}

/* ---------- 两步路径图 ---------- */
.page-faq .pathmap {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--ink-600);
}

.page-faq .pathmap__node {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 14px 0 14px 18px;
  border-bottom: var(--faq-line);
}

.page-faq .pathmap__node:last-child {
  border-bottom: 0;
}

.page-faq .pathmap__node--key {
  border-left: 2px solid var(--or-500);
  margin-left: -1px;
  background: var(--ink-800);
}

.page-faq .pathmap__c {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gry-500);
}

.page-faq .pathmap__node--key .pathmap__c {
  color: var(--or-500);
}

.page-faq .pathmap__t {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 16px;
  color: var(--paper-100);
}

.page-faq .pathmap__d {
  font-size: 14px;
  line-height: 1.7;
  color: var(--gry-500);
}

/* ---------- 卡点清单 ---------- */
.page-faq .stuck {
  margin: 0;
  padding: 0;
  border-top: var(--faq-line);
}

.page-faq .stuck__item {
  padding: 16px 0;
  border-bottom: var(--faq-line);
}

.page-faq .stuck__q {
  display: flex;
  gap: 12px;
  align-items: baseline;
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 16px;
  line-height: 1.4;
  color: var(--gry-300);
}

.page-faq .stuck__q .mono {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gry-500);
}

.page-faq .stuck__a {
  margin: 0 0 0 30px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--gry-500);
}

/* ---------- 术语表 ---------- */
.page-faq .glossary {
  min-width: 480px;
}

.page-faq .glossary th:first-child,
.page-faq .glossary td:first-child {
  text-align: right;
  white-space: nowrap;
}

.page-faq .glossary tbody th {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 16px;
  color: var(--cy-500);
  border-bottom: var(--faq-line);
  letter-spacing: 0.02em;
}

.page-faq .glossary tbody tr:hover td,
.page-faq .glossary tbody tr:hover th {
  background: var(--ink-800);
  color: var(--cy-200);
}

/* ---------- 收尾 ---------- */
.page-faq .faq-outro {
  padding: 36px 0 0;
}

.page-faq .faq-outro h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 20px;
  letter-spacing: -0.01em;
  color: var(--paper-100);
}

.page-faq .faq-outro p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
}

/* ---------- 固定锚点 ---------- */
.page-faq .faq-jump {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 20;
  display: flex;
  gap: 8px;
}

.page-faq .faq-jump .btn {
  border-bottom: 1px solid transparent;
  font-size: 12px;
  padding: 8px 12px;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 768px) {
  .page-faq {
    --faq-num: 64px;
  }

  .page-faq .faq-hero {
    padding: 48px 0 32px;
  }

  .page-faq .faq-hero h1 {
    font-size: 38px;
  }

  .page-faq .faq-hero__lead {
    font-size: 16px;
  }

  .page-faq .faq-index ol {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 24px;
  }

  .page-faq .step__body {
    grid-template-columns: var(--faq-num) 1fr;
    gap: 20px;
    align-items: start;
  }

  .page-faq .step__n {
    padding-top: 3px;
  }

  .page-faq .timeline__item {
    grid-template-columns: 88px 1fr;
    gap: 20px;
    align-items: start;
  }

  .page-faq .pathmap__node {
    grid-template-columns: 56px 200px 1fr;
    gap: 20px;
    align-items: baseline;
  }

  .page-faq .chapter {
    padding: 56px 0 44px;
  }

  .page-faq .chapter__num {
    font-size: 44px;
  }

  .page-faq .chapter h2 {
    font-size: 25px;
  }

  .page-faq .glossary tbody td,
  .page-faq .glossary tbody th {
    background: transparent;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-index ol {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .stuck {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 24px;
  }

  .page-faq .stuck__item {
    border-top: 0;
  }

  .page-faq .faq-jump {
    right: 24px;
    bottom: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq a,
  .page-faq .step__box,
  .page-faq .chapter__head,
  .page-faq .step__title {
    transition: none !important;
  }
}