.page-faq {
  --faq-pad: clamp(1.05rem, 2.6vw, 1.6rem);
  --faq-gap: clamp(.85rem, 2vw, 1.25rem);
  --faq-chap: clamp(2.75rem, 7vw, 5.5rem);
  display: block;
  color: var(--bright);
}

.page-faq .container {
  padding-inline: clamp(1rem, 4vw, 2rem);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(1.5rem, 4.5vw, 3rem) clamp(1.15rem, 3.6vw, 2.75rem);
  border: 1px solid var(--line-grid);
  border-radius: var(--radius);
  background-color: var(--ink-panel);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(to right, rgba(42, 54, 84, .5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 54, 84, .5) 1px, transparent 1px),
    radial-gradient(95% 130% at 92% -12%, rgba(91, 231, 214, .2), transparent 58%),
    radial-gradient(75% 115% at 0% 112%, rgba(122, 107, 255, .18), transparent 62%);
  background-size: 88px 88px, 88px 88px, 100% 100%, 100% 100%;
  -webkit-mask-image: linear-gradient(155deg, #000 8%, rgba(0, 0, 0, .18) 80%, transparent);
  mask-image: linear-gradient(155deg, #000 8%, rgba(0, 0, 0, .18) 80%, transparent);
}

.page-faq .faq-hero__eyebrow {
  margin: 0 0 .85rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-hero__title {
  margin: 0;
  max-width: 18ch;
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 6.4vw, 3.6rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: .01em;
  color: var(--bright);
}

.page-faq .faq-hero__lede {
  margin: 1.05rem 0 0;
  max-width: 46ch;
  font-size: clamp(.97rem, 2.1vw, 1.06rem);
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .faq-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: .55rem .7rem;
  margin-top: 1.5rem;
  padding-top: 1.2rem;
  border-top: 1px dashed var(--line-grid);
}

.page-faq .faq-chip {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .34rem .75rem;
  border: 1px solid var(--line-grid);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .04em;
  color: var(--muted);
  background: rgba(5, 10, 24, .5);
}

.page-faq .faq-chip strong {
  font-weight: 600;
  color: var(--cyan);
}

/* ---------- 章节 ---------- */
.page-faq .chapter {
  margin-top: var(--faq-chap);
  scroll-margin-top: 5rem;
}

.page-faq .chapter__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .55rem .9rem;
}

.page-faq .chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(.85rem, 2vw, 1rem);
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-faq .chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 3.6vw, 1.95rem);
  font-weight: 700;
  line-height: 1.28;
  color: var(--bright);
}

.page-faq .chapter__rule {
  flex: 1 1 70px;
  min-width: 56px;
  height: 1px;
  align-self: center;
  background: linear-gradient(90deg, var(--cyan), rgba(91, 231, 214, 0) 80%);
}

.page-faq .chapter__sub {
  margin: .8rem 0 0;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 六栏索引带 ---------- */
.page-faq .faq-index {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-grid);
  border: 1px solid var(--line-grid);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-faq .faq-index__item {
  display: grid;
  gap: .38rem;
  padding: var(--faq-pad);
  background: var(--ink-panel);
}

.page-faq .faq-index__item--key {
  background:
    linear-gradient(150deg, rgba(91, 231, 214, .16), rgba(12, 20, 40, .94) 62%),
    var(--ink-panel);
  box-shadow: inset 3px 0 0 0 var(--cyan);
}

.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--violet);
}

.page-faq .faq-index__item--key .faq-index__num {
  color: var(--cyan);
}

.page-faq .faq-index__name {
  font-size: clamp(.98rem, 2.2vw, 1.05rem);
  font-weight: 600;
  line-height: 1.4;
  color: var(--bright);
}

.page-faq .faq-index__badge {
  display: inline-block;
  margin-left: .35rem;
  padding: .1rem .4rem;
  border: 1px solid rgba(255, 122, 61, .45);
  border-radius: 4px;
  background: rgba(255, 122, 61, .16);
  font-family: var(--font-mono);
  font-size: .64rem;
  font-style: normal;
  letter-spacing: .06em;
  vertical-align: middle;
  color: var(--orange);
  white-space: nowrap;
}

.page-faq .faq-index__desc {
  font-size: .84rem;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 图片 ---------- */
.page-faq .media.faq-figure {
  margin: var(--faq-gap) 0 0;
  aspect-ratio: 3 / 2;
}

.page-faq .media.faq-figure--wide {
  aspect-ratio: 12 / 7;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius);
}

/* ---------- 版本对照表 ---------- */
.page-faq .faq-diff {
  margin-top: 1.5rem;
  border: 1px solid var(--line-grid);
  border-radius: var(--radius);
  background: var(--ink-float);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-diff table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: .92rem;
}

.page-faq .faq-diff thead th {
  padding: .8rem 1rem;
  text-align: left;
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .1em;
  color: var(--muted);
  background: rgba(5, 10, 24, .55);
  border-bottom: 1px solid var(--line-grid);
}

.page-faq .faq-diff tbody th,
.page-faq .faq-diff tbody td {
  padding: .9rem 1rem;
  text-align: left;
  vertical-align: top;
  line-height: 1.65;
  border-bottom: 1px solid rgba(42, 54, 84, .7);
}

.page-faq .faq-diff tbody tr:last-child th,
.page-faq .faq-diff tbody tr:last-child td {
  border-bottom: 0;
}

.page-faq .faq-diff tbody th {
  width: 24%;
  font-weight: 600;
  color: var(--bright);
}

.page-faq .faq-diff tbody td {
  color: var(--muted);
}

.page-faq .faq-diff__alt {
  color: var(--bright);
  background: rgba(122, 107, 255, .12);
}

.page-faq .faq-read {
  margin: 1.15rem 0 0;
  padding: .95rem 1.1rem;
  border-left: 3px solid var(--orange);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: rgba(255, 122, 61, .08);
  font-size: .93rem;
  line-height: 1.78;
  color: var(--muted);
}

.page-faq .faq-read strong {
  color: var(--bright);
  font-weight: 600;
}

.page-faq .note.note--cyan {
  margin-top: 1rem;
}

/* ---------- 检索对照演示 ---------- */
.page-faq .faq-lookup {
  margin-top: 1.5rem;
  border: 1px solid var(--line-grid);
  border-radius: var(--radius);
  background: var(--ink-float);
  overflow: hidden;
}

.page-faq .faq-lookup__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .7rem;
  padding: .85rem 1rem;
  border-bottom: 1px solid var(--line-grid);
  background: rgba(5, 10, 24, .55);
}

.page-faq .faq-lookup__label {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-faq .faq-lookup .switch {
  display: inline-flex;
  gap: 2px;
  padding: 2px;
  border: 1px solid var(--line-grid);
  border-radius: 999px;
  background: var(--ink-void);
}

.page-faq .faq-lookup .switch__btn {
  padding: .36rem .85rem;
  border: 0;
  border-radius: 999px;
  background: transparent;
  font-family: var(--font-body);
  font-size: .8rem;
  color: var(--muted);
  cursor: pointer;
  transition: background .18s var(--ease), color .18s var(--ease);
}

.page-faq .faq-lookup .switch__btn:hover {
  color: var(--bright);
}

.page-faq .faq-lookup .switch__btn[aria-selected="true"] {
  background: var(--orange);
  color: #22100a;
  font-weight: 600;
}

.page-faq .faq-lookup .switch__btn:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-faq .faq-lookup__q {
  margin: 0;
  padding: .9rem 1rem 0;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-faq .faq-result {
  list-style: none;
  margin: .35rem 0 0;
  padding: 0 1rem 1rem;
}

.page-faq .faq-result__row {
  display: grid;
  gap: .4rem;
  padding: .85rem 0;
  border-bottom: 1px dashed var(--line-grid);
}

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

.page-faq .faq-result__tag {
  justify-self: start;
  padding: .16rem .5rem;
  border: 1px solid currentColor;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .08em;
}

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

.page-faq .faq-result__tag--guide {
  color: var(--violet);
}

.page-faq .faq-result__tag--article {
  color: var(--muted);
}

.page-faq .faq-result__title {
  font-size: .95rem;
  line-height: 1.6;
  color: var(--bright);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .18s var(--ease), color .18s var(--ease);
}

.page-faq .faq-result__title:hover,
.page-faq .faq-result__title:focus-visible {
  color: var(--cyan);
  border-bottom-color: currentColor;
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-folds {
  margin-top: 1.35rem;
  border-bottom: 1px solid var(--line-grid);
}

.page-faq .faq-folds > details.fold {
  border: 0;
  border-top: 1px solid var(--line-grid);
  border-radius: 0;
  background: transparent;
}

.page-faq details.fold > .fold__summary {
  display: flex;
  align-items: baseline;
  gap: .85rem;
  padding: 1rem .2rem;
  margin: 0;
  list-style: none;
  cursor: pointer;
  font-size: clamp(.96rem, 2.2vw, 1.02rem);
  font-weight: 500;
  line-height: 1.55;
  color: var(--bright);
}

.page-faq details.fold > .fold__summary::-webkit-details-marker {
  display: none;
}

.page-faq details.fold > .fold__summary::after {
  content: "+";
  margin-left: auto;
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--cyan);
}

.page-faq details.fold[open] > .fold__summary::after {
  content: "–";
}

.page-faq details.fold > .fold__summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-faq .fold__idx {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--orange);
}

.page-faq details.fold > .fold__body {
  padding: 0 .2rem 1.15rem 3.05rem;
  font-size: .94rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-faq details.fold > .fold__body p {
  margin: 0;
}

/* ---------- 联络 ---------- */
.page-faq .faq-ask {
  margin-top: 1.4rem;
  padding: var(--faq-pad);
  border: 1px solid var(--line-grid);
  border-left: 3px solid var(--violet);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--ink-panel);
}

.page-faq .faq-ask__list {
  margin: 0;
  padding-left: 1.1rem;
  display: grid;
  gap: .55rem;
  font-size: .94rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .faq-ask__list li::marker {
  color: var(--violet);
}

.page-faq .faq-contact {
  display: grid;
  gap: 1px;
  margin-top: var(--faq-gap);
  border: 1px solid var(--line-grid);
  border-radius: var(--radius);
  background: var(--line-grid);
  overflow: hidden;
}

.page-faq .faq-contact__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: .2rem;
  padding: .9rem 1.1rem;
  background: var(--ink-panel);
}

.page-faq .faq-contact__key {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--muted);
}

.page-faq .faq-contact__val {
  font-size: .96rem;
  line-height: 1.6;
  color: var(--bright);
  overflow-wrap: anywhere;
}

.page-faq .faq-outro {
  margin: 1.3rem 0 0;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--muted);
}

.page-faq .faq-outro a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px dashed rgba(91, 231, 214, .6);
}

.page-faq .faq-outro a:hover,
.page-faq .faq-outro a:focus-visible {
  color: var(--bright);
  border-bottom-color: var(--bright);
}

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-faq .faq-contact__row {
    grid-template-columns: 9.5rem minmax(0, 1fr);
    align-items: baseline;
    gap: 1rem;
  }

  .page-faq .faq-contact__key {
    padding-top: .1rem;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__lede {
    max-width: 52ch;
  }

  .page-faq .faq-index {
    grid-template-columns: repeat(7, minmax(0, 1fr));
  }

  .page-faq .faq-index__item--key {
    grid-column: span 2;
  }

  .page-faq .faq-index__name {
    font-size: 1rem;
  }
}

@media (max-width: 599px) {
  .page-faq .faq-diff table {
    min-width: 460px;
    font-size: .86rem;
  }

  .page-faq .faq-diff tbody th,
  .page-faq .faq-diff tbody td,
  .page-faq .faq-diff thead th {
    padding: .75rem .8rem;
  }

  .page-faq details.fold > .fold__body {
    padding-left: .2rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-result__title,
  .page-faq .faq-lookup .switch__btn {
    transition: none;
  }
}