.page-faq {
  --faq-cut: 16px;
  background: var(--by-ink);
  color: var(--by-white);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(22px, 4.5vw, 52px) 0 clamp(26px, 4vw, 44px);
  background:
    radial-gradient(110% 82% at 88% -12%, rgba(57, 242, 208, .18), transparent 62%),
    radial-gradient(84% 70% at 0% 112%, rgba(255, 138, 61, .13), transparent 58%),
    linear-gradient(170deg, #071A14 0%, #0B2B22 62%, #0A2620 100%);
  border-bottom: 1px solid var(--by-line);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(90deg, rgba(169, 255, 240, .05) 0 1px, transparent 1px 92px);
  opacity: .7;
}

.page-faq .faq-hero > .by-wrap {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  align-items: end;
  margin-top: clamp(14px, 2.5vw, 22px);
}

.page-faq .faq-hero__intro h1,
.page-faq .faq-hero h1 {
  margin: 10px 0 14px;
  font-family: var(--by-display);
  font-size: clamp(40px, 11vw, 74px);
  line-height: .95;
  letter-spacing: -0.02em;
  color: var(--by-white);
}

.page-faq .faq-hero .by-lead {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(15px, 2.2vw, 17px);
  line-height: 1.78;
  color: rgba(255, 255, 255, .82);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(18px, 3vw, 26px);
}

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

.page-faq .faq-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
  filter: saturate(1.05);
}

/* ---------- 分类索引 ---------- */
.page-faq .faq-index {
  margin-top: clamp(22px, 3.6vw, 38px);
  padding-top: 16px;
  border-top: 1px dashed var(--by-line);
}

.page-faq .faq-index__label {
  margin: 0 0 12px;
  font-family: var(--by-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--by-cyan);
}

.page-faq .faq-index__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-jump {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 15px;
  font-size: 13.5px;
  line-height: 1.2;
  color: var(--by-cyan-soft);
  text-decoration: none;
  border: 1px solid var(--by-line);
  background: rgba(31, 92, 74, .3);
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
  transition: background .25s var(--by-ease), color .25s var(--by-ease), border-color .25s var(--by-ease);
}

.page-faq .faq-jump:hover,
.page-faq .faq-jump:focus-visible {
  background: rgba(57, 242, 208, .17);
  border-color: var(--by-cyan);
  color: var(--by-white);
}

.page-faq .faq-jump__num {
  font-family: var(--by-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--by-orange);
}

/* ---------- 主体分栏 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: clamp(22px, 3.5vw, 40px);
  padding-top: clamp(30px, 4.5vw, 60px);
  padding-bottom: clamp(40px, 6vw, 78px);
}

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

.page-faq .faq-group {
  margin-bottom: clamp(26px, 4vw, 46px);
  scroll-margin-top: 96px;
}

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

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--by-line-soft);
}

.page-faq .faq-group__num {
  font-family: var(--by-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--by-orange);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--by-display);
  font-size: clamp(21px, 3.4vw, 30px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--by-white);
}

.page-faq .faq-group__note {
  margin: 0 0 16px;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(255, 255, 255, .64);
}

/* ---------- 可展开问答 ---------- */
.page-faq .faq-item {
  position: relative;
  margin: 0 0 10px;
  background: linear-gradient(165deg, rgba(11, 43, 34, .94), rgba(7, 26, 20, .94));
  border: 1px solid var(--by-line-soft);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
  transition: background .25s var(--by-ease), border-color .25s var(--by-ease);
}

.page-faq .faq-item:hover {
  border-color: var(--by-line);
}

.page-faq .faq-item[open] {
  background: linear-gradient(165deg, rgba(21, 68, 56, .9), rgba(9, 32, 25, .94));
  border-color: var(--by-line);
}

.page-faq .faq-item[open]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 16px;
  width: 3px;
  background: var(--by-cyan);
  box-shadow: 0 0 14px rgba(57, 242, 208, .5);
}

.page-faq .faq-item > summary {
  display: flex;
  align-items: flex-start;
  gap: 11px;
  position: relative;
  padding: 15px 44px 15px 15px;
  list-style: none;
  cursor: pointer;
}

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

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

.page-faq .faq-item > summary::after {
  content: "";
  position: absolute;
  right: 18px;
  top: 50%;
  width: 9px;
  height: 9px;
  margin-top: -7px;
  border-right: 2px solid var(--by-cyan);
  border-bottom: 2px solid var(--by-cyan);
  transform: rotate(45deg);
  transition: transform .28s var(--by-ease), margin-top .28s var(--by-ease);
}

.page-faq .faq-item[open] > summary::after {
  transform: rotate(-135deg);
  margin-top: -2px;
}

.page-faq .faq-item > summary:focus-visible {
  outline: 2px solid var(--by-cyan);
  outline-offset: -3px;
}

.page-faq .faq-item__num {
  flex: none;
  padding-top: 3px;
  font-family: var(--by-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--by-cyan);
}

.page-faq .faq-item__q {
  font-size: clamp(15px, 2.3vw, 17px);
  font-weight: 700;
  line-height: 1.55;
  color: var(--by-white);
}

.page-faq .faq-item__body {
  padding: 13px 18px 17px;
  border-top: 1px dashed var(--by-line-soft);
}

.page-faq .faq-item__body p {
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(255, 255, 255, .78);
}

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

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

.page-faq .faq-item__body a:hover {
  color: var(--by-cyan-soft);
}

/* ---------- 图 ---------- */
.page-faq .faq-figure {
  margin: 18px 0 4px;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  clip-path: polygon(0 20px, 20px 0, 100% 0, 100% 100%, 0 100%);
}

.page-faq .faq-figure .by-figure__caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: rgba(255, 255, 255, .58);
}

/* ---------- 侧栏 ---------- */
.page-faq .faq-side {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-faq .faq-sidelist {
  padding: 16px 16px 18px;
  background: rgba(11, 43, 34, .72);
  border: 1px solid var(--by-line-soft);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
}

.page-faq .faq-side__title {
  margin: 0 0 12px;
  font-family: var(--by-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--by-cyan);
}

.page-faq .faq-side__list {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-side__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  font-size: 14px;
  color: rgba(255, 255, 255, .8);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color .2s var(--by-ease), border-color .2s var(--by-ease), background .2s var(--by-ease);
}

.page-faq .faq-side__link:hover,
.page-faq .faq-side__link:focus-visible {
  color: var(--by-white);
  border-left-color: var(--by-cyan);
  background: rgba(57, 242, 208, .07);
}

.page-faq .faq-side__n {
  font-family: var(--by-mono);
  font-size: 11px;
  color: var(--by-amber);
}

.page-faq .faq-status {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(255, 255, 255, .72);
}

.page-faq .faq-status:first-of-type {
  margin-top: 0;
}

.page-faq .faq-status__dot {
  flex: none;
  width: 7px;
  height: 7px;
  margin-top: 7px;
  border-radius: 50%;
  background: var(--by-cyan);
  box-shadow: 0 0 0 4px rgba(57, 242, 208, .16);
}

.page-faq .faq-copyrow {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .faq-copy {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  padding: 8px 12px;
  font-family: var(--by-mono);
  font-size: 12px;
  letter-spacing: .02em;
  word-break: break-all;
  color: var(--by-cyan);
  background: rgba(57, 242, 208, .08);
  border: 1px solid var(--by-line);
  cursor: pointer;
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
  transition: background .2s var(--by-ease), color .2s var(--by-ease);
}

.page-faq .faq-copy:hover,
.page-faq .faq-copy:focus-visible {
  background: rgba(57, 242, 208, .2);
  color: var(--by-cyan-soft);
}

.page-faq .faq-copy[data-copied]::after {
  content: "已复制";
  margin-left: 8px;
  color: var(--by-amber);
}

.page-faq .faq-toplink {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--by-line-soft);
  font-family: var(--by-mono);
  font-size: 12px;
}

.page-faq .faq-toplink a {
  color: rgba(255, 255, 255, .7);
  text-decoration: none;
  letter-spacing: .06em;
}

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

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  }

  .page-faq .faq-item__body {
    padding: 15px 22px 19px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-body {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: start;
  }

  .page-faq .faq-side {
    position: sticky;
    top: 86px;
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-body {
    grid-template-columns: minmax(0, 1fr) 322px;
    gap: 48px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-jump,
  .page-faq .faq-item,
  .page-faq .faq-item > summary::after,
  .page-faq .faq-side__link,
  .page-faq .faq-copy {
    transition: none;
  }
}