.page-faq {
  --faq-grid-line: rgba(20, 41, 77, .62);
  --faq-rule: 1px solid var(--line);
  --faq-focus: 2px solid var(--signal);
  background: var(--ink);
  color: var(--paper);
  overflow-x: hidden;
}

.page-faq a:focus-visible,
.page-faq button:focus-visible,
.page-faq summary:focus-visible {
  outline: var(--faq-focus);
  outline-offset: 3px;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  padding: clamp(22px, 4vw, 40px) 0 clamp(28px, 4.6vw, 60px);
  border-bottom: var(--faq-rule);
  isolation: isolate;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(to right, var(--faq-grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--faq-grid-line) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: .42;
  pointer-events: none;
}

.page-faq .breadcrumb {
  margin: 0 0 clamp(22px, 3.4vw, 40px);
}

.page-faq .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.page-faq .breadcrumb__item {
  display: flex;
  align-items: center;
  color: var(--muted);
}

.page-faq .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin: 0 10px;
  color: var(--line);
}

.page-faq .breadcrumb__item a {
  color: var(--muted);
  text-decoration: none;
  transition: color .2s var(--ease);
}

.page-faq .breadcrumb__item a:hover {
  color: var(--signal);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  align-items: end;
}

.page-faq .faq-hero__kicker {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--signal);
}

.page-faq .faq-hero__kicker::after {
  content: "";
  flex: 0 1 120px;
  height: 1px;
  background: var(--line);
}

.page-faq .faq-hero h1 {
  margin: 0 0 clamp(16px, 2.4vw, 26px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 6.2vw, 74px);
  line-height: 1.02;
  letter-spacing: -.025em;
  color: var(--paper);
  text-wrap: balance;
}

.page-faq .faq-hero__lead {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.55vw, 17px);
  line-height: 1.78;
  color: var(--muted);
}

.page-faq .faq-hero__art {
  margin: 0;
  border: var(--faq-rule);
  background: var(--panel);
}

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

/* ---------- 主体两栏 ---------- */

.page-faq .faq-body {
  padding: clamp(30px, 5vw, 64px) 0 clamp(40px, 6vw, 84px);
}

.page-faq .faq-layout {
  display: grid;
  gap: clamp(26px, 4vw, 58px);
}

.page-faq .faq-index {
  border-top: 2px solid var(--signal);
  padding-top: 14px;
}

.page-faq .faq-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-faq .faq-index__list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0 0 10px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-index__item {
  flex: 0 0 auto;
}

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  min-height: 44px;
  padding: 11px 14px;
  border: var(--faq-rule);
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--signal-dim);
}

.page-faq .faq-index__name {
  font-size: 13.5px;
  line-height: 1.4;
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--paper);
  border-color: var(--signal-dim);
  background: var(--panel);
}

.page-faq .faq-index__link:hover .faq-index__num,
.page-faq .faq-index__link:focus-visible .faq-index__num {
  color: var(--signal);
}

/* ---------- 筛选 ---------- */

.page-faq .faq-panel {
  min-width: 0;
}

.page-faq .faq-filters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-bottom: 18px;
  margin-bottom: clamp(22px, 3.4vw, 38px);
  border-bottom: var(--faq-rule);
}

.page-faq .faq-filters .filter-bar__label {
  flex: 1 1 100%;
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-faq .faq-filters .filter-chip {
  min-height: 44px;
  padding: 11px 18px;
  border: var(--faq-rule);
  border-radius: 0;
  background: transparent;
  color: var(--muted);
  font-family: var(--font-body);
  font-size: 13.5px;
  line-height: 1;
  cursor: pointer;
  transition: color .2s var(--ease), background-color .2s var(--ease), border-color .2s var(--ease);
}

.page-faq .faq-filters .filter-chip:hover {
  color: var(--paper);
  border-color: var(--signal-dim);
}

.page-faq .faq-filters .filter-chip[aria-pressed="true"] {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--ink-text);
  font-weight: 600;
}

/* ---------- 分组 ---------- */

.page-faq .faq-list {
  min-width: 0;
}

.page-faq .faq-group {
  margin-bottom: clamp(32px, 4.6vw, 58px);
  scroll-margin-top: 96px;
}

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

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-group__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--signal);
}

.page-faq .faq-group__head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 2.6vw, 29px);
  line-height: 1.22;
  letter-spacing: -.012em;
  color: var(--paper);
  text-wrap: balance;
}

/* ---------- 折叠问答 ---------- */

.page-faq .faq-item {
  border-bottom: var(--faq-rule);
}

.page-faq .faq-item > summary {
  position: relative;
  display: block;
  min-height: 56px;
  padding: 18px 46px 18px 2px;
  cursor: pointer;
  list-style: none;
  font-size: clamp(15px, 1.6vw, 17px);
  font-weight: 500;
  line-height: 1.6;
  color: var(--paper);
  transition: color .2s var(--ease);
}

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

.page-faq .faq-item > summary::after {
  content: "+";
  position: absolute;
  top: 18px;
  right: 8px;
  font-family: var(--font-mono);
  font-size: 19px;
  line-height: 1.4;
  color: var(--signal-dim);
  transition: color .2s var(--ease);
}

.page-faq .faq-item > summary:hover {
  color: var(--signal);
}

.page-faq .faq-item > summary:hover::after {
  color: var(--signal);
}

.page-faq .faq-item[open] > summary::after {
  content: "−";
  color: var(--signal);
}

.page-faq .faq-item__body {
  padding: 0 8px 22px 2px;
  max-width: 74ch;
  animation: faq-reveal-line .3s var(--ease) both;
}

.page-faq .faq-item__body p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.82;
  color: var(--muted);
}

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

.page-faq .faq-steps {
  list-style: none;
  counter-reset: faq-step;
  margin: 0 0 14px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-faq .faq-steps li {
  counter-increment: faq-step;
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 10px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted);
}

.page-faq .faq-steps li::before {
  content: counter(faq-step, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.9;
  color: var(--signal-dim);
}

/* ---------- 手机端示意图 ---------- */

.page-faq .faq-mobile-figure {
  margin: 18px 0 6px;
  max-width: 340px;
  border: var(--faq-rule);
  background: var(--panel);
}

.page-faq .faq-mobile-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-faq .faq-mobile-figure figcaption {
  padding: 10px 14px;
  border-top: var(--faq-rule);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .05em;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 求助区 ---------- */

.page-faq .faq-help {
  background: var(--paper);
  color: var(--ink-text);
  padding: clamp(36px, 5.4vw, 76px) 0;
  scroll-margin-top: 96px;
}

.page-faq .faq-help__grid {
  display: grid;
  gap: clamp(28px, 4vw, 60px);
}

.page-faq .faq-help h2 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.6vw, 42px);
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--ink-text);
  text-wrap: balance;
}

.page-faq .faq-help p {
  margin: 0 0 24px;
  max-width: 56ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--paper-muted);
}

.page-faq .faq-help .btn--signal {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 14px 26px;
  border: 1px solid var(--ink);
  border-radius: 0;
  background: var(--ink);
  color: var(--signal);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .02em;
  text-decoration: none;
  transition: background-color .2s var(--ease), color .2s var(--ease);
}

.page-faq .faq-help .btn--signal:hover {
  background: var(--signal);
  color: var(--ink-text);
}

.page-faq .faq-help__links {
  display: grid;
  align-content: start;
  border-top: 1px solid rgba(10, 16, 32, .18);
}

.page-faq .faq-help__links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 52px;
  padding: 15px 2px;
  border-bottom: 1px solid rgba(10, 16, 32, .18);
  color: var(--ink-text);
  font-size: 15px;
  text-decoration: none;
  transition: color .2s var(--ease), padding-left .2s var(--ease);
}

.page-faq .faq-help__links a::after {
  content: "→";
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--paper-muted);
  transition: color .2s var(--ease), transform .2s var(--ease);
}

.page-faq .faq-help__links a:hover {
  color: #2F6B00;
  padding-left: 8px;
}

.page-faq .faq-help__links a:hover::after {
  color: #2F6B00;
  transform: translateX(3px);
}

/* ---------- 动效 ---------- */

@keyframes faq-reveal-line {
  from {
    opacity: 0;
    transform: translateY(-5px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 响应式 ---------- */

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
    gap: clamp(32px, 4vw, 64px);
  }
}

@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: 246px minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 92px;
    border-top-width: 2px;
  }

  .page-faq .faq-index__list {
    flex-direction: column;
    gap: 0;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-faq .faq-index__item {
    flex: 1 1 auto;
  }

  .page-faq .faq-index__link {
    border: 0;
    border-left: 2px solid transparent;
    padding: 11px 12px 11px 14px;
    white-space: normal;
  }

  .page-faq .faq-index__link:hover,
  .page-faq .faq-index__link:focus-visible {
    border-left-color: var(--signal);
  }

  .page-faq .faq-filters .filter-bar__label {
    flex: 0 0 auto;
    margin: 0 10px 0 0;
  }

  .page-faq .faq-mobile-figure {
    max-width: 380px;
  }
}

@media (min-width: 880px) {
  .page-faq .faq-help__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: start;
  }
}

@media (max-width: 480px) {
  .page-faq .faq-hero h1 {
    font-size: clamp(29px, 8.4vw, 40px);
  }

  .page-faq .faq-filters .filter-chip {
    padding: 10px 14px;
    font-size: 13px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}