.page-faq {
  --faq-space: clamp(56px, 8vw, 104px);
  --faq-ink-soft: rgba(27, 42, 54, 0.84);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--rule-dark);
  background:
    radial-gradient(120% 96% at 88% -12%, rgba(47, 227, 210, 0.16), transparent 58%),
    linear-gradient(158deg, var(--abyss) 0%, var(--deep) 100%);
  color: var(--paper);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(199, 211, 220, 0.07) 0 1px,
    transparent 1px 96px
  );
}

.page-faq .faq-hero__inner {
  position: relative;
  display: grid;
  gap: 40px;
  padding-top: clamp(36px, 6vw, 76px);
  padding-bottom: clamp(44px, 7vw, 88px);
}

.page-faq .faq-kicker {
  margin: 22px 0 0;
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-hero h1 {
  margin: 16px 0 0;
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(38px, 7.4vw, 90px);
  line-height: 1.03;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-faq .faq-lead {
  margin: 26px 0 0;
  max-width: 34em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
  color: var(--mist);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.page-faq .faq-hero__aside-title {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mist);
  opacity: 0.8;
}

.page-faq .faq-jump {
  display: grid;
  grid-template-columns: 2.4em minmax(0, 1fr) 1.2em;
  align-items: center;
  gap: 12px;
  padding: 15px 0;
  border-bottom: 1px solid var(--rule-dark);
  color: var(--paper);
  text-decoration: none;
  transition: color 180ms ease;
}

.page-faq .faq-jump:first-of-type {
  border-top: 1px solid var(--rule-dark);
}

.page-faq .faq-jump__num {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-faq .faq-jump__text {
  font-size: 15px;
  line-height: 1.5;
}

.page-faq .faq-jump__arrow {
  font-family: var(--mono);
  font-size: 15px;
  color: var(--coral);
  transition: transform 180ms ease;
}

.page-faq .faq-jump:hover,
.page-faq .faq-jump:focus-visible {
  color: var(--cyan);
}

.page-faq .faq-jump:hover .faq-jump__arrow,
.page-faq .faq-jump:focus-visible .faq-jump__arrow {
  transform: translateX(4px);
}

/* ---------- 通用小节标题 ---------- */
.page-faq .sec-label {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq h2 {
  margin: 0;
  font-family: var(--sans);
  font-weight: 700;
  font-size: clamp(24px, 3.2vw, 36px);
  line-height: 1.25;
  letter-spacing: -0.01em;
}

/* ---------- 01 五类标签 ---------- */
.page-faq .faq-tags {
  background: var(--paper);
  color: var(--graphite);
  padding: var(--faq-space) 0;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-tags .sec-label {
  color: var(--hull);
}

.page-faq .faq-tags__inner {
  display: grid;
  gap: 40px;
}

.page-faq .faq-tags__lead {
  margin: 18px 0 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--faq-ink-soft);
}

.page-faq .tag-list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-faq .tag-row {
  display: grid;
  grid-template-columns: 2.4em minmax(0, 1fr);
  gap: 6px 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-faq .tag-row__num {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--hull);
  padding-top: 3px;
}

.page-faq .tag-row__body h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--graphite);
}

.page-faq .tag-row__body p {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--faq-ink-soft);
}

.page-faq .tag-row__count {
  grid-column: 2;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--coral);
}

.page-faq .faq-tags__total {
  margin: 22px 0 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--hull);
}

.page-faq .faq-tags__media {
  margin: 0;
  align-self: start;
}

.page-faq .faq-tags__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  background: var(--deep);
}

.page-faq .faq-tags__media .media__caption {
  margin-top: 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  line-height: 1.7;
  color: var(--hull);
}

/* ---------- 02 问题列表 ---------- */
.page-faq .faq-list-sec {
  background: var(--deep);
  color: var(--paper);
  padding: var(--faq-space) 0;
}

.page-faq .faq-split {
  display: grid;
  gap: 32px;
}

.page-faq .faq-rail {
  align-self: start;
}

.page-faq .faq-rail__title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mist);
  opacity: 0.75;
}

.page-faq .faq-rail__tags {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-rail__tags li {
  flex: 0 0 auto;
}

.page-faq .faq-rail__tags a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-bottom: 2px solid transparent;
  font-size: 14px;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color 180ms ease, border-color 180ms ease, background-color 180ms ease;
}

.page-faq .faq-rail__tags a .mono {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--hull);
}

.page-faq .faq-rail__tags a:hover,
.page-faq .faq-rail__tags a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--coral);
  background: rgba(199, 211, 220, 0.07);
}

.page-faq .faq-rail__tags a:hover .mono,
.page-faq .faq-rail__tags a:focus-visible .mono {
  color: var(--cyan);
}

.page-faq .faq-rail__total {
  margin: 0;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-faq .faq-rail__hint {
  margin: 10px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
  opacity: 0.72;
}

.page-faq .faq-qa .sec-label {
  color: var(--cyan);
}

.page-faq .faq-qa h2 {
  color: var(--paper);
  margin-bottom: 26px;
}

.page-faq .qa {
  border-top: 1px solid var(--rule-dark);
  background: transparent;
  transition: background-color 220ms ease;
}

.page-faq .qa:last-of-type {
  border-bottom: 1px solid var(--rule-dark);
}

.page-faq .qa[open] {
  background: var(--paper);
  color: var(--graphite);
}

.page-faq .qa > summary {
  display: grid;
  grid-template-columns: 2.4em minmax(0, 1fr) 1.4em;
  gap: 10px;
  align-items: start;
  padding: 17px 16px;
  cursor: pointer;
  list-style: none;
  color: var(--paper);
  transition: color 180ms ease;
}

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

.page-faq .qa > summary::marker {
  content: "";
}

.page-faq .qa[open] > summary {
  color: var(--graphite);
}

.page-faq .qa > summary:hover .qa__title,
.page-faq .qa > summary:focus-visible .qa__title {
  color: var(--cyan);
}

.page-faq .qa[open] > summary:hover .qa__title,
.page-faq .qa[open] > summary:focus-visible .qa__title {
  color: var(--hull);
}

.page-faq .qa__num {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  padding-top: 3px;
}

.page-faq .qa[open] .qa__num {
  color: var(--coral);
}

.page-faq .qa__title {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.55;
  letter-spacing: 0;
}

.page-faq .qa__sign {
  position: relative;
  width: 14px;
  height: 14px;
  margin-top: 6px;
  justify-self: end;
}

.page-faq .qa__sign::before,
.page-faq .qa__sign::after {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
  background: var(--cyan);
  transition: transform 200ms ease, background-color 200ms ease;
}

.page-faq .qa__sign::after {
  transform: rotate(90deg);
}

.page-faq .qa[open] .qa__sign::after {
  transform: rotate(0deg);
}

.page-faq .qa[open] .qa__sign::before,
.page-faq .qa[open] .qa__sign::after {
  background: var(--coral);
}

.page-faq .qa__body {
  padding: 0 16px 24px;
}

.page-faq .qa__verdict {
  margin: 0 0 16px;
  padding-left: 12px;
  border-left: 2px solid var(--coral);
  font-size: 15px;
  line-height: 1.8;
  color: var(--graphite);
}

.page-faq .qa__steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: faqstep;
}

.page-faq .qa__steps li {
  counter-increment: faqstep;
  position: relative;
  padding-left: 34px;
  margin-top: 11px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--faq-ink-soft);
}

.page-faq .qa__steps li::before {
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 3px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--hull);
}

.page-faq .qa__next {
  display: inline-block;
  margin-top: 18px;
  padding-bottom: 2px;
  border-bottom: 1px solid var(--coral);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--deep);
  text-decoration: none;
}

.page-faq .qa__next:hover,
.page-faq .qa__next:focus-visible {
  color: var(--coral);
}

.page-faq .faq-qa__foot {
  margin: 26px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--mist);
  opacity: 0.85;
}

/* ---------- 03 按现象找答案 ---------- */
.page-faq .faq-signals {
  background: var(--hull);
  color: var(--paper);
  padding: var(--faq-space) 0;
  border-top: 1px solid var(--rule-dark);
  border-bottom: 1px solid var(--rule-dark);
}

.page-faq .faq-signals h2 {
  color: var(--paper);
}

.page-faq .faq-signals__lead {
  margin: 16px 0 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

.page-faq .signal-list {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
}

.page-faq .signal-list li {
  margin: 0 0 10px;
  break-inside: avoid;
}

.page-faq .signal-list a {
  display: block;
  padding: 14px 16px;
  border-left: 2px solid var(--rule-dark);
  background: rgba(6, 23, 38, 0.22);
  text-decoration: none;
  transition: border-color 180ms ease, background-color 180ms ease;
}

.page-faq .signal-list a:hover,
.page-faq .signal-list a:focus-visible {
  border-left-color: var(--cyan);
  background: rgba(6, 23, 38, 0.42);
}

.page-faq .signal-quote {
  display: block;
  font-size: 15px;
  line-height: 1.65;
  color: var(--paper);
}

.page-faq .signal-target {
  display: block;
  margin-top: 6px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-faq .faq-signals__media {
  margin: 40px 0 0;
}

.page-faq .faq-signals__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  background: var(--abyss);
}

.page-faq .faq-signals__media .media__caption {
  margin-top: 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 04 术语对照 ---------- */
.page-faq .faq-glossary {
  background: var(--paper);
  color: var(--graphite);
  padding: var(--faq-space) 0;
}

.page-faq .faq-glossary .sec-label {
  color: var(--hull);
}

.page-faq .faq-glossary__lead {
  margin: 16px 0 30px;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--faq-ink-soft);
}

.page-faq .table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-faq .term-table {
  width: 100%;
  min-width: 480px;
  border-collapse: collapse;
  font-family: var(--mono);
  font-size: 13.5px;
  letter-spacing: 0.02em;
  text-align: left;
}

.page-faq .term-table th {
  padding: 0 16px 12px;
  border-bottom: 1px solid var(--graphite);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--hull);
}

.page-faq .term-table td {
  padding: 13px 16px;
  border-bottom: 1px solid var(--line);
  color: var(--graphite);
}

.page-faq .term-table tbody tr:nth-child(even) {
  background: rgba(221, 227, 230, 0.45);
}

.page-faq .term-table td:first-child {
  color: var(--deep);
}

/* ---------- 05 还是没解决 ---------- */
.page-faq .faq-help {
  background:
    radial-gradient(90% 80% at 10% 0%, rgba(47, 227, 210, 0.1), transparent 62%),
    var(--abyss);
  color: var(--paper);
  padding: var(--faq-space) 0 calc(var(--faq-space) + 16px);
}

.page-faq .faq-help h2 {
  color: var(--paper);
}

.page-faq .faq-help__inner {
  display: grid;
  gap: 40px;
}

.page-faq .faq-help__text > p {
  margin: 16px 0 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

.page-faq .help-needs {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
}

.page-faq .help-needs li {
  display: grid;
  grid-template-columns: 2.4em minmax(0, 1fr);
  gap: 12px;
  padding: 14px 0;
  border-top: 1px solid var(--rule-dark);
}

.page-faq .help-needs li:last-child {
  border-bottom: 1px solid var(--rule-dark);
}

.page-faq .help-needs__num {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  padding-top: 2px;
}

.page-faq .help-needs strong {
  display: block;
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
}

.page-faq .help-needs p {
  margin: 5px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-faq .help-links {
  margin: 26px 0 0;
  max-width: 36em;
  font-size: 13.5px;
  line-height: 1.9;
  color: var(--mist);
}

.page-faq .help-links a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 227, 210, 0.4);
}

.page-faq .help-links a:hover,
.page-faq .help-links a:focus-visible {
  border-bottom-color: var(--coral);
  color: var(--coral);
}

.page-faq .faq-help__card {
  align-self: start;
  padding: 24px 20px 26px;
  border: 1px solid var(--rule-dark);
  border-left: 2px solid var(--cyan);
  background: rgba(20, 64, 95, 0.42);
}

.page-faq .faq-help__card-label {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mist);
  opacity: 0.8;
}

.page-faq .faq-help__mail {
  margin: 10px 0 0;
  font-family: var(--mono);
  font-size: 15px;
  letter-spacing: 0.01em;
  line-height: 1.6;
  color: var(--cyan);
  word-break: break-all;
}

.page-faq .faq-help__copy {
  margin-top: 14px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  padding: 7px 12px;
  border: 1px solid var(--rule-dark);
  background: transparent;
  color: var(--paper);
  cursor: pointer;
  transition: border-color 180ms ease, color 180ms ease;
}

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

.page-faq .faq-help__copy[data-copied="true"] {
  border-color: var(--coral);
  color: var(--coral);
}

.page-faq .faq-help__note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-help__btn {
  margin-top: 20px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-faq .tag-row {
    grid-template-columns: 2.6em minmax(0, 1fr) auto;
    align-items: start;
  }

  .page-faq .tag-row__count {
    grid-column: 3;
    grid-row: 1;
    padding-top: 4px;
  }

  .page-faq .signal-list {
    columns: 2;
    column-gap: 40px;
  }

  .page-faq .faq-help__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 64px;
    align-items: end;
  }

  .page-faq .faq-tags__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 64px;
    align-items: start;
  }

  .page-faq .faq-split {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 56px;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--status-h) + var(--bar-h) + 24px);
  }

  .page-faq .faq-rail__tags {
    display: block;
    overflow: visible;
    margin-bottom: 18px;
    border-top: 1px solid var(--rule-dark);
  }

  .page-faq .faq-rail__tags a {
    justify-content: space-between;
    padding: 11px 12px;
    border-bottom: 1px solid var(--rule-dark);
    border-left: 2px solid transparent;
  }

  .page-faq .faq-rail__tags a:hover,
  .page-faq .faq-rail__tags a:focus-visible {
    border-left-color: var(--coral);
  }

  .page-faq .qa > summary {
    padding: 19px 22px;
  }

  .page-faq .qa__body {
    padding: 0 22px 26px;
    padding-left: calc(22px + 2.4em + 10px);
  }

  .page-faq .qa__body .qa__next {
    margin-left: 0;
  }

  .page-faq .faq-signals__media {
    margin-top: 48px;
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-hero__inner {
    gap: 88px;
  }

  .page-faq .faq-help__inner {
    gap: 88px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-jump__arrow,
  .page-faq .qa__sign::before,
  .page-faq .qa__sign::after,
  .page-faq .qa,
  .page-faq .qa > summary,
  .page-faq .signal-list a,
  .page-faq .faq-rail__tags a {
    transition: none;
  }
}