.page-faq {
  --faq-rail: 232px;
  --faq-line: rgba(56, 242, 208, 0.18);
  --faq-line-soft: rgba(143, 163, 154, 0.28);
  --faq-ink-soft: #1B4A3A;
  background: var(--ink);
  color: var(--paper);
  padding-bottom: clamp(48px, 8vw, 104px);
}

.page-faq a {
  color: var(--cyan);
}

.page-faq .breadcrumb {
  padding-top: clamp(20px, 4vw, 34px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-faq .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--moss);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding: clamp(26px, 5vw, 52px) 0 clamp(28px, 5vw, 48px);
  border-bottom: 1px solid var(--moss);
}

.page-faq .faq-hero .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
  margin: 0;
}

.page-faq .faq-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 8vw, 76px);
  line-height: 1.02;
  letter-spacing: -0.035em;
  margin: 14px 0 20px;
  max-width: 14em;
  color: var(--white);
}

.page-faq .faq-hero__lead {
  font-family: var(--font-serif);
  font-size: clamp(15px, 2.2vw, 18px);
  line-height: 1.85;
  color: var(--paper);
  max-width: 40em;
  margin: 0;
}

.page-faq .faq-hero__meta {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: clamp(26px, 4vw, 40px) 0 0;
  border-top: 1px solid var(--faq-line);
}

.page-faq .faq-hero__meta > div {
  padding: 14px 0;
  border-bottom: 1px solid var(--faq-line-soft);
}

.page-faq .faq-hero__meta dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 6px;
}

.page-faq .faq-hero__meta dd {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--paper);
}

.page-faq .faq-hero__meta .mono {
  font-family: var(--font-mono);
  font-size: clamp(22px, 4vw, 30px);
  color: var(--orange);
  letter-spacing: 0.02em;
  margin-right: 4px;
}

/* ---------- 索引 ---------- */
.page-faq .faq-index {
  margin-top: clamp(34px, 6vw, 64px);
}

.page-faq .faq-index h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 3.4vw, 28px);
  letter-spacing: -0.02em;
  margin: 0 0 18px;
  color: var(--white);
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--moss);
}

.page-faq .faq-index__list li {
  border-bottom: 1px solid var(--moss);
}

.page-faq .faq-index__list a {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "no name"
    "no desc";
  gap: 2px 16px;
  padding: 18px 12px 18px 0;
  text-decoration: none;
  transition: background var(--ease), padding-left var(--ease);
}

.page-faq .faq-index__list a:hover,
.page-faq .faq-index__list a:focus-visible {
  background: var(--panel);
  padding-left: 12px;
}

.page-faq .faq-index__no {
  grid-area: no;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--cyan);
  line-height: 1.5;
  padding-top: 2px;
}

.page-faq .faq-index__name {
  grid-area: name;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(16px, 2.6vw, 20px);
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-faq .faq-index__desc {
  grid-area: desc;
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 轨道 + 问答 ---------- */
.page-faq .faq-shell {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  margin-top: clamp(34px, 6vw, 64px);
}

.page-faq .faq-rail__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
  margin: 0 0 12px;
}

.page-faq .faq-rail__list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0 0 16px;
  padding: 0 0 6px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
}

.page-faq .faq-rail__list li {
  flex: 0 0 auto;
  scroll-snap-align: start;
}

.page-faq .faq-rail__list a {
  display: block;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: var(--paper);
  padding: 9px 14px;
  border: 1px solid var(--moss);
  transition: border-color var(--ease), color var(--ease), background var(--ease);
}

.page-faq .faq-rail__list a:hover,
.page-faq .faq-rail__list a:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(56, 242, 208, 0.06);
}

.page-faq .faq-rail__tip {
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  margin: 0 0 16px;
  max-width: 22em;
}

.page-faq .faq-rail__btn {
  display: inline-block;
  font-size: 13px;
  text-decoration: none;
}

/* ---------- 分区 ---------- */
.page-faq .faq-blocks {
  display: grid;
  gap: clamp(44px, 7vw, 88px);
  min-width: 0;
}

.page-faq .faq-block {
  scroll-margin-top: calc(var(--bar-h) + 20px);
  min-width: 0;
}

.page-faq .faq-block__head {
  border-left: 3px solid var(--cyan);
  padding-left: 16px;
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-faq .faq-block__head .eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  margin: 0 0 10px;
}

.page-faq .faq-block__head h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 4.6vw, 40px);
  line-height: 1.12;
  letter-spacing: -0.03em;
  margin: 0 0 12px;
  color: var(--white);
}

.page-faq .faq-block__intro {
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  margin: 0;
  max-width: 36em;
}

/* ---------- 图 ---------- */
.page-faq .faq-figure {
  margin: 0 0 clamp(22px, 3vw, 32px);
  border: 1px solid var(--moss);
  overflow: hidden;
  background: var(--panel);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-faq .faq-figure figcaption {
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
  padding: 12px 16px;
  border-top: 1px solid var(--moss);
}

.page-faq .faq-figure--chart {
  background: var(--ink);
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-list {
  border-top: 1px solid var(--faq-line);
}

.page-faq .faq-item {
  border-bottom: 1px solid var(--faq-line-soft);
}

.page-faq .faq-item summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  gap: 12px;
  padding: 16px 4px 16px 0;
  cursor: pointer;
  list-style: none;
  transition: background var(--ease), padding-left var(--ease);
}

.page-faq .faq-item summary::-webkit-details-marker {
  display: none;
}

.page-faq .faq-item summary:hover {
  background: var(--panel);
  padding-left: 10px;
}

.page-faq .faq-item summary:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: 2px;
}

.page-faq .faq-item__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-faq .faq-item__q {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(15px, 2.4vw, 17px);
  line-height: 1.55;
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-faq .faq-item__mark {
  position: relative;
  width: 12px;
  height: 12px;
  align-self: center;
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform var(--ease), opacity var(--ease);
}

.page-faq .faq-item__mark::before {
  left: 0;
  top: 5px;
  width: 12px;
  height: 1px;
}

.page-faq .faq-item__mark::after {
  left: 5px;
  top: 0;
  width: 1px;
  height: 12px;
}

.page-faq .faq-item[open] .faq-item__mark::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-faq .faq-item[open] .faq-item__q {
  color: var(--cyan-soft);
}

.page-faq .faq-item[open] .faq-item__no {
  color: var(--orange);
}

.page-faq .faq-item__a {
  padding: 0 0 20px 0;
  border-left: 1px solid var(--moss);
  margin-left: 2px;
  padding-left: 16px;
}

.page-faq .faq-item__a p {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--paper);
  margin: 0 0 10px;
  max-width: 36em;
  opacity: 0.92;
}

.page-faq .faq-item__a p:last-child {
  margin-bottom: 0;
}

.page-faq .faq-item__links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.page-faq .faq-item__links a {
  font-size: 13px;
  text-decoration: none;
  border-bottom: 1px solid var(--cyan);
  padding-bottom: 2px;
  transition: color var(--ease), border-color var(--ease);
}

.page-faq .faq-item__links a:hover {
  color: var(--cyan-soft);
  border-color: var(--cyan-soft);
}

/* ---------- 术语速查 ---------- */
.page-faq .faq-terms {
  background: var(--paper);
  color: var(--ink);
  padding: clamp(22px, 4vw, 40px);
  margin-left: calc(-1 * clamp(0px, 2vw, 0px));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), 0 100%);
}

.page-faq .faq-terms .faq-block__head {
  border-left-color: var(--faq-ink-soft);
}

.page-faq .faq-terms .faq-block__head .eyebrow {
  color: var(--faq-ink-soft);
}

.page-faq .faq-terms .faq-block__head h2 {
  color: var(--ink);
}

.page-faq .faq-terms .faq-block__intro {
  color: #2c4a40;
}

.page-faq .faq-terms .faq-figure {
  border-color: rgba(27, 74, 58, 0.3);
  background: var(--ink);
  margin-top: 20px;
}

.page-faq .faq-terms .faq-figure figcaption {
  background: var(--ink);
  color: var(--muted);
}

.page-faq .faq-terms__wrap {
  margin-top: clamp(18px, 3vw, 26px);
  overflow-x: auto;
}

.page-faq .faq-terms__caption {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--faq-ink-soft);
  padding-bottom: 10px;
}

.page-faq .faq-terms__table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.page-faq .faq-terms__table thead th {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  font-weight: 500;
  color: var(--faq-ink-soft);
  padding: 8px 12px 8px 0;
  border-bottom: 1px solid var(--faq-ink-soft);
}

.page-faq .faq-terms__table tbody th,
.page-faq .faq-terms__table tbody td {
  text-align: left;
  padding: 12px 12px 12px 0;
  border-bottom: 1px solid rgba(27, 74, 58, 0.18);
  vertical-align: top;
  line-height: 1.7;
  color: #16332b;
}

.page-faq .faq-terms__table tbody th {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--ink);
  white-space: nowrap;
}

.page-faq .faq-terms__table tbody td:last-child {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--faq-ink-soft);
  white-space: nowrap;
}

/* ---------- 结尾提示 ---------- */
.page-faq .faq-cta {
  border: 1px solid var(--cyan);
  background: var(--panel);
  padding: clamp(22px, 4vw, 36px);
}

.page-faq .faq-cta__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(18px, 3vw, 24px);
  letter-spacing: -0.02em;
  color: var(--white);
  margin: 0 0 10px;
}

.page-faq .faq-cta__text {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
  margin: 0 0 20px;
  max-width: 36em;
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .faq-cta__actions .btn {
  text-decoration: none;
  font-size: 14px;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-hero__meta {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-top: 1px solid var(--moss);
    border-bottom: 1px solid var(--moss);
  }

  .page-faq .faq-hero__meta > div {
    padding: 18px 20px;
    border-bottom: 0;
    border-left: 1px solid var(--faq-line);
  }

  .page-faq .faq-hero__meta > div:first-child {
    padding-left: 0;
    border-left: 0;
  }

  .page-faq .faq-index__list a {
    grid-template-columns: 72px minmax(0, 1fr) minmax(0, 1.1fr);
    grid-template-areas: "no name desc";
    align-items: baseline;
    gap: 24px;
    padding: 20px 16px 20px 0;
  }

  .page-faq .faq-index__desc {
    font-size: 13.5px;
    text-align: right;
  }

  .page-faq .faq-terms__table tbody td:last-child {
    font-size: 13px;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-shell {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--bar-h) + 28px);
    padding-right: 20px;
    border-right: 1px solid var(--moss);
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    overflow: visible;
    padding: 0;
    margin-bottom: 22px;
  }

  .page-faq .faq-rail__list a {
    border: 0;
    border-left: 2px solid var(--moss);
    padding: 8px 0 8px 14px;
    font-size: 12.5px;
    color: var(--muted);
  }

  .page-faq .faq-rail__list a:hover,
  .page-faq .faq-rail__list a:focus-visible {
    border-left-color: var(--cyan);
    background: none;
    color: var(--cyan);
  }

  .page-faq .faq-rail__tip {
    border-top: 1px solid var(--moss);
    padding-top: 16px;
    margin-top: 0;
    max-width: none;
  }

  .page-faq .faq-terms {
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 42px), 0 100%);
  }
}

@media (max-width: 719px) {
  .page-faq .faq-terms__table thead {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
  }

  .page-faq .faq-terms__table tbody tr {
    display: block;
    padding: 14px 0;
    border-bottom: 1px solid rgba(27, 74, 58, 0.18);
  }

  .page-faq .faq-terms__table tbody th,
  .page-faq .faq-terms__table tbody td {
    display: block;
    border-bottom: 0;
    padding: 2px 0;
    white-space: normal;
  }

  .page-faq .faq-terms__table tbody td::before {
    content: attr(data-label);
    font-family: var(--font-mono);
    font-size: 10.5px;
    letter-spacing: 0.1em;
    color: var(--faq-ink-soft);
    margin-right: 8px;
  }

  .page-faq .faq-terms__table tbody td:last-child {
    font-size: 12.5px;
    white-space: normal;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index__list a,
  .page-faq .faq-item summary,
  .page-faq .faq-rail__list a,
  .page-faq .faq-item__mark::before,
  .page-faq .faq-item__mark::after {
    transition: none;
  }
}