.page-faq {
  --faq-line: rgba(195, 211, 223, 0.22);
  --faq-line-strong: rgba(195, 211, 223, 0.4);
  background: linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 55%, var(--ink-900) 100%);
  color: var(--snow);
}

.page-faq .container {
  width: 100%;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 0 var(--pad);
}

/* ---------- 面包屑 ---------- */
.page-faq .breadcrumb {
  padding-top: clamp(16px, 3vw, 28px);
}

.page-faq .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gray);
}

.page-faq .breadcrumb li:not(:last-child)::after {
  content: "/";
  margin-left: 8px;
  color: var(--ink-700);
}

.page-faq .breadcrumb a {
  color: var(--gray);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

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

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding: clamp(24px, 5vw, 52px) 0 clamp(40px, 7vw, 84px);
  border-bottom: 2px solid var(--ink-700);
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  grid-template-columns: 1fr;
}

.page-faq .faq-hero__text {
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-width: 0;
}

.page-faq .faq-hero .index-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--gray);
  margin: 0;
  text-transform: uppercase;
}

.page-faq .faq-hero h1 {
  margin: 0;
  font-size: clamp(2.2rem, 6.4vw, 4.4rem);
  line-height: 1.02;
  letter-spacing: -0.035em;
  font-weight: 900;
  color: var(--snow);
  max-width: 20ch;
}

.page-faq .faq-hero__lead {
  margin: 0;
  max-width: 46ch;
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  line-height: 1.78;
  color: var(--gray);
}

.page-faq .faq-hero__quick {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(16px, 3vw, 36px);
  margin: 4px 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 2px solid var(--ink-700);
  font-size: 14px;
  color: var(--gray);
}

.page-faq .faq-hero__quick li {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
}

.page-faq .faq-hero__quick .data {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  font-size: 28px;
  color: var(--cyan);
  line-height: 1;
}

.page-faq .faq-hero__figure {
  margin: 0;
  border: 2px solid var(--ink-700);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
  background: var(--ink-800);
}

.page-faq .faq-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 索引与切换 ---------- */
.page-faq .section {
  padding: clamp(44px, 7vw, 96px) 0;
}

.page-faq .section-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 14px;
}

.page-faq .coord {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--ink-900);
  background: var(--cyan);
  padding: 4px 9px;
  line-height: 1.3;
  flex: none;
}

.page-faq .section-title {
  margin: 0;
  font-size: clamp(1.5rem, 3.4vw, 2.4rem);
  line-height: 1.12;
  letter-spacing: -0.025em;
  font-weight: 800;
  color: var(--snow);
}

.page-faq .faq-index__note {
  margin: 0 0 clamp(24px, 4vw, 40px);
  max-width: 44ch;
  color: var(--gray);
  line-height: 1.75;
}

.page-faq .faq-switch__bar {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  background: var(--ink-700);
  border: 2px solid var(--ink-700);
}

.page-faq .faq-switch__btn {
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 56px;
  padding: 12px 18px;
  border: 0;
  background: var(--ink-900);
  color: var(--gray);
  font-family: inherit;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-align: left;
  cursor: pointer;
  transition: background 180ms ease, color 180ms ease;
}

.page-faq .faq-switch__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gray);
  border: 1px solid var(--faq-line-strong);
  padding: 3px 7px;
  flex: none;
}

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

.page-faq .faq-switch__btn:hover {
  background: var(--ink-800);
  color: var(--snow);
}

.page-faq .faq-switch__btn.is-active {
  background: var(--cyan);
  color: var(--ink-900);
}

.page-faq .faq-switch__btn.is-active .faq-switch__num {
  border-color: var(--ink-900);
  color: var(--ink-900);
}

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

.page-faq .faq-switch__search {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin: clamp(20px, 3vw, 32px) 0 clamp(20px, 3vw, 32px);
  padding-bottom: 16px;
  border-bottom: 2px solid var(--ink-700);
}

.page-faq .faq-switch__input {
  flex: 1 1 260px;
  min-height: 48px;
  padding: 10px 14px;
  background: var(--ink-900);
  border: 2px solid var(--ink-700);
  color: var(--snow);
  font-family: var(--font-mono);
  font-size: 14px;
}

.page-faq .faq-switch__input::placeholder {
  color: var(--gray);
  font-family: var(--font-sans);
}

.page-faq .faq-switch__input:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
  border-color: var(--cyan);
}

.page-faq .faq-switch__hint {
  font-size: 13px;
  color: var(--gray);
}

.page-faq .faq-panel {
  animation: faq-fade 240ms ease both;
}

.page-faq .faq-panel[hidden] {
  display: none;
}

.page-faq .faq-panel__title {
  margin: 0 0 8px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--cyan);
  font-family: var(--font-mono);
  text-transform: uppercase;
}

@keyframes faq-fade {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 问题列表 ---------- */
.page-faq .faq-list {
  border-top: 2px solid var(--ink-700);
}

.page-faq .faq-item {
  border-bottom: 2px solid var(--ink-700);
  position: relative;
}

.page-faq .faq-item[hidden] {
  display: none;
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: clamp(18px, 2.6vw, 26px) 0;
  cursor: pointer;
  list-style: none;
  font-size: clamp(1.05rem, 2.1vw, 1.35rem);
  font-weight: 800;
  line-height: 1.42;
  letter-spacing: -0.01em;
  color: var(--snow);
  transition: color 180ms ease;
}

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

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

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

.page-faq .faq-item__mark {
  flex: none;
  width: 1.4em;
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--cyan);
  text-align: center;
  line-height: inherit;
}

.page-faq .faq-item[open] .faq-item__mark::before {
  content: "";
}

.page-faq .faq-item__a {
  padding: 0 0 clamp(20px, 3vw, 30px) calc(1.4em + 16px);
  border-left: 2px solid var(--faq-line-strong);
  padding-left: calc(1.4em + 16px);
  margin-left: 0;
  animation: faq-fade 240ms ease both;
}

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--gray);
  font-weight: 400;
}

.page-faq .faq-item__a .data {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  color: var(--cyan);
}

.page-faq .faq-item__a a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan);
}

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

/* ---------- 下一步指引 ---------- */
.page-faq .faq-next {
  background: var(--ink-800);
  border-top: 2px solid var(--ink-700);
  border-bottom: 2px solid var(--ink-700);
}

.page-faq .faq-next__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  background: var(--ink-700);
  border: 2px solid var(--ink-700);
  margin-top: clamp(20px, 3vw, 34px);
}

.page-faq .faq-next__card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(22px, 3vw, 34px);
  background: var(--ink-900);
  color: var(--snow);
  text-decoration: none;
  transition: background 180ms ease;
}

.page-faq .faq-next__card .index-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-faq .faq-next__card strong {
  font-size: clamp(1rem, 1.9vw, 1.15rem);
  font-weight: 700;
  line-height: 1.55;
}

.page-faq .faq-next__arrow {
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--orange);
  transition: transform 180ms ease;
}

.page-faq .faq-next__card:hover,
.page-faq .faq-next__card:focus-visible {
  background: var(--indigo);
}

.page-faq .faq-next__card:hover .faq-next__arrow,
.page-faq .faq-next__card:focus-visible .faq-next__arrow {
  transform: translateX(6px);
}

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

/* ---------- 联系帮助 ---------- */
.page-faq .faq-help__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
  align-items: start;
}

.page-faq .faq-help__copy p {
  max-width: 46ch;
  line-height: 1.8;
  color: var(--gray);
  margin: 0 0 20px;
}

.page-faq .faq-help__list {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-faq .faq-help__list li {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: baseline;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--faq-line);
  font-size: 15px;
  line-height: 1.7;
  color: var(--gray);
}

.page-faq .faq-help__key {
  flex: none;
  min-width: 84px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--snow);
  background: var(--wine);
  padding: 4px 9px;
  line-height: 1.4;
}

.page-faq .faq-help__list .data {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-faq .faq-help__copy a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan);
}

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

.page-faq .faq-help__back {
  font-size: 14px;
  color: var(--gray);
}

.page-faq .faq-help__figure {
  margin: 0;
  border: 2px solid var(--ink-700);
  box-shadow: var(--shadow-hard);
  background: var(--ink-800);
}

.page-faq .faq-help__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-faq .faq-help__figure .media-frame__caption {
  display: block;
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--gray);
  border-top: 2px solid var(--ink-700);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-switch__bar {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-faq .faq-next__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-faq .faq-switch__bar {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-faq .faq-next__grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .page-faq .faq-item__a {
    max-width: 78ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-panel,
  .page-faq .faq-item__a {
    animation: none;
  }

  .page-faq .faq-next__arrow,
  .page-faq .faq-switch__btn,
  .page-faq .faq-next__card {
    transition: none;
  }
}