.page-faq {
  --faq-row: clamp(14px, 2.4vw, 22px);
  --faq-indent: clamp(30px, 4vw, 46px);
  display: block;
  position: relative;
  background: var(--pitch-void);
  color: var(--chalk-white);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.7;
  padding-bottom: clamp(40px, 7vw, 88px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4.5vw, 52px) 0 clamp(30px, 5vw, 62px);
  border-bottom: 1px solid var(--line-mid);
  background:
    radial-gradient(120% 90% at 12% 0%, rgba(11, 43, 35, .92), rgba(5, 11, 15, 0) 70%),
    linear-gradient(180deg, rgba(11, 43, 35, .45), rgba(5, 11, 15, 0) 100%),
    var(--pitch-void);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-soft) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: .8;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -1px;
  width: clamp(120px, 26vw, 320px);
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--signal-cyan));
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero__title {
  margin: 16px 0 0;
  font-size: clamp(32px, 5.4vw, 68px);
  max-width: 15ch;
  line-height: 1.06;
}

.page-faq .faq-hero__lede {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 60ch;
  color: var(--slate-text);
}

.page-faq .faq-hero__meta {
  margin: 18px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--signal-cyan);
  padding-left: 14px;
  border-left: 2px solid var(--cyan-mid);
}

/* ---------- 问题索引 ---------- */
.page-faq .faq-index {
  margin-top: clamp(22px, 3.6vw, 40px);
  border: 1px solid var(--line-soft);
  background: var(--panel-paper);
}

.page-faq .faq-index__label {
  margin: 0;
  padding: 13px var(--faq-row);
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--amber-warm);
  background: var(--amber-soft);
}

.page-faq .faq-index__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
}

.page-faq .faq-index__link {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 14px var(--faq-row);
  border-left: 2px solid transparent;
  border-bottom: 1px solid var(--line-soft);
  color: var(--chalk-white);
  text-decoration: none;
  transition: background var(--t-base) var(--ease), border-color var(--t-base) var(--ease);
}

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

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  background: var(--cyan-soft);
  border-left-color: var(--signal-cyan);
  outline: none;
}

.page-faq .faq-index__no {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--signal-cyan);
}

.page-faq .faq-index__name {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .01em;
}

.page-faq .faq-index__count {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--slate-text);
}

/* ---------- 分组 ---------- */
.page-faq .faq-groups {
  display: grid;
  gap: clamp(30px, 5.5vw, 56px);
  margin-top: clamp(34px, 5.5vw, 72px);
}

.page-faq .faq-group {
  display: grid;
  gap: 16px;
  padding-top: clamp(18px, 2.8vw, 28px);
  border-top: 1px solid var(--line-mid);
  scroll-margin-top: 96px;
}

.page-faq .faq-group__head {
  display: grid;
  gap: 8px;
}

.page-faq .faq-group__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--amber-warm);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: clamp(21px, 2.6vw, 29px);
  letter-spacing: -.01em;
  line-height: 1.2;
  color: var(--chalk-white);
}

.page-faq .faq-group__note {
  margin: 0;
  max-width: 42ch;
  font-size: 14px;
  color: var(--slate-text);
}

.page-faq .faq-list {
  display: grid;
  gap: 10px;
  min-width: 0;
}

/* ---------- 手风琴条目 ---------- */
.page-faq .faq-item {
  border: 1px solid var(--line-soft);
  background: var(--panel-paper);
  transition: border-color var(--t-base) var(--ease), background var(--t-base) var(--ease);
}

.page-faq .faq-item:hover {
  border-color: var(--cyan-mid);
}

.page-faq .faq-item[open] {
  border-color: var(--line-strong);
  background:
    linear-gradient(180deg, rgba(11, 43, 35, .62), rgba(15, 30, 28, 0) 72%),
    var(--panel-paper);
}

.page-faq .faq-item__q {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: start;
  gap: 12px;
  padding: 15px var(--faq-row);
  cursor: pointer;
  list-style: none;
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--chalk-white);
  transition: color var(--t-base) var(--ease);
}

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

.page-faq .faq-item__q::marker {
  content: "";
}

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

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

.page-faq .faq-item__no {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--signal-cyan);
  padding-top: 3px;
}

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

.page-faq .faq-item__mark {
  position: relative;
  width: 16px;
  height: 16px;
  margin-top: 3px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  color: var(--signal-cyan);
  transition: border-color var(--t-base) var(--ease), background var(--t-base) var(--ease);
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: currentColor;
  transform: translate(-50%, -50%);
  transition: transform var(--t-base) var(--ease), opacity var(--t-base) var(--ease);
}

.page-faq .faq-item__mark::before {
  width: 7px;
  height: 1px;
}

.page-faq .faq-item__mark::after {
  width: 1px;
  height: 7px;
}

.page-faq .faq-item[open] .faq-item__mark {
  border-color: var(--signal-cyan);
  background: var(--cyan-soft);
}

.page-faq .faq-item[open] .faq-item__mark::after {
  transform: translate(-50%, -50%) scaleY(0);
}

.page-faq .faq-item__a {
  margin: 0 var(--faq-row) 18px;
  margin-left: var(--faq-indent);
  padding-left: 16px;
  border-left: 1px solid var(--line-mid);
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--slate-text);
}

.page-faq .faq-item[open] .faq-item__a {
  animation: faq-a-fade var(--t-base) var(--ease);
}

.page-faq .faq-item__a p {
  margin: 0 0 .72em;
}

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

.page-faq .faq-item__a strong {
  color: var(--chalk-white);
  font-weight: 700;
}

.page-faq .faq-item__a a {
  color: var(--signal-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

@keyframes faq-a-fade {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 快捷键展示 ---------- */
.page-faq .faq-keys {
  margin: 12px 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-keys__item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 12px 14px;
  border: 1px dashed var(--line-mid);
  background: rgba(5, 11, 15, .55);
}

.page-faq .faq-keys__dash {
  color: var(--slate-text);
  font-family: var(--font-mono);
  font-size: 12px;
}

.page-faq .faq-keys__desc {
  margin-left: 4px;
  font-size: 13px;
  color: var(--chalk-white);
  letter-spacing: .01em;
}

.page-faq kbd {
  display: inline-block;
  min-width: 26px;
  padding: 5px 7px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  line-height: 1;
  color: var(--chalk-white);
  background: linear-gradient(180deg, var(--turf-deep), var(--pitch-void));
  border: 1px solid var(--line-strong);
  border-bottom-width: 2px;
  border-radius: 3px;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
}

.page-faq kbd:hover {
  color: var(--signal-cyan);
  border-color: var(--signal-cyan);
  box-shadow: 0 0 0 3px var(--cyan-soft);
}

/* ---------- 图文 ---------- */
.page-faq .faq-figure {
  margin: 4px 0 0;
}

.page-faq .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line-mid);
  background: var(--turf-deep);
}

/* ---------- 联系卡 ---------- */
.page-faq .faq-contact {
  display: grid;
  gap: 16px;
  margin-top: 6px;
  padding: clamp(16px, 2.6vw, 26px);
  border: 1px solid var(--line-mid);
  border-left: 3px solid var(--signal-cyan);
  background:
    linear-gradient(135deg, rgba(11, 43, 35, .75), rgba(5, 11, 15, .9)),
    var(--panel-paper);
}

.page-faq .faq-contact__body {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.page-faq .faq-contact__key {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--amber-warm);
}

.page-faq .faq-contact__val {
  margin: 0;
  font-size: 14.5px;
  color: var(--chalk-white);
  line-height: 1.6;
  word-break: break-word;
}

.page-faq .faq-contact__val--mail {
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--signal-cyan);
  word-break: break-all;
}

.page-faq .faq-contact__figure {
  margin: 0;
}

/* ---------- 延伸入口 ---------- */
.page-faq .faq-next {
  margin-top: clamp(40px, 7vw, 88px);
  padding-top: clamp(24px, 4vw, 40px);
  border-top: 1px solid var(--line-mid);
}

.page-faq .faq-next__head {
  display: grid;
  gap: 10px;
}

.page-faq .faq-next__head .section-title {
  margin: 0;
}

.page-faq .faq-next__grid {
  display: grid;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 32px);
}

.page-faq .faq-next__card {
  display: grid;
  gap: 6px;
  padding: clamp(16px, 2.4vw, 22px);
  border: 1px solid var(--line-soft);
  background: var(--panel-paper);
  color: var(--chalk-white);
  text-decoration: none;
  transition: border-color var(--t-base) var(--ease), transform var(--t-base) var(--ease), background var(--t-base) var(--ease);
}

.page-faq .faq-next__card:hover,
.page-faq .faq-next__card:focus-visible {
  border-color: var(--signal-cyan);
  background: var(--cyan-soft);
  transform: translateY(-2px);
  outline: none;
}

.page-faq .faq-next__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--amber-warm);
}

.page-faq .faq-next__t {
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -.01em;
}

.page-faq .faq-next__d {
  font-size: 13.5px;
  color: var(--slate-text);
  line-height: 1.65;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-faq .faq-index__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq-index__item:nth-child(odd) .faq-index__link {
    border-right: 1px solid var(--line-soft);
  }

  .page-faq .faq-index__item:nth-last-child(-n + 1) .faq-index__link {
    border-bottom: 0;
  }

  .page-faq .faq-next__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-index__list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-faq .faq-index__item:nth-child(odd) .faq-index__link {
    border-right: 0;
  }

  .page-faq .faq-index__item .faq-index__link {
    border-bottom: 0;
    border-right: 1px solid var(--line-soft);
    grid-template-columns: 26px minmax(0, 1fr);
    grid-template-rows: auto auto;
    align-items: start;
    padding: 18px var(--faq-row);
    gap: 6px 10px;
  }

  .page-faq .faq-index__item:last-child .faq-index__link {
    border-right: 0;
  }

  .page-faq .faq-index__no {
    grid-row: 1 / span 2;
    font-size: 18px;
    padding-top: 0;
  }

  .page-faq .faq-index__name {
    grid-column: 2;
  }

  .page-faq .faq-index__count {
    grid-column: 2;
  }

  .page-faq .faq-group {
    grid-template-columns: minmax(0, 240px) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
    align-items: start;
  }

  .page-faq .faq-group__head {
    position: sticky;
    top: 96px;
  }

  .page-faq .faq-contact {
    grid-template-columns: minmax(0, 1fr) minmax(0, 300px);
    align-items: start;
  }

  .page-faq .faq-next__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-group {
    grid-template-columns: minmax(0, 280px) minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq * {
    animation: none !important;
    transition: none !important;
  }
}