.page-faq {
  --faq-panel: rgba(12, 21, 51, 0.78);
  --faq-panel-strong: rgba(12, 21, 51, 0.96);
  --faq-hair: rgba(38, 53, 95, 0.72);
  background: var(--ink-900);
  color: var(--white);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-faq a {
  color: inherit;
  text-decoration: none;
}

.page-faq .mono {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(20px, 3vw, 32px) 0 clamp(32px, 5vw, 56px);
  background:
    radial-gradient(130% 110% at 92% -10%, rgba(38, 224, 255, 0.16), transparent 58%),
    radial-gradient(90% 80% at 0% 100%, rgba(255, 177, 59, 0.08), transparent 60%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 100%);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 120px;
  background-image: repeating-linear-gradient(
    115deg,
    rgba(38, 224, 255, 0.07) 0px,
    rgba(38, 224, 255, 0.07) 1px,
    transparent 1px,
    transparent 14px
  );
  pointer-events: none;
  mask-image: linear-gradient(180deg, transparent, rgba(0, 0, 0, 0.9));
  -webkit-mask-image: linear-gradient(180deg, transparent, rgba(0, 0, 0, 0.9));
}

.page-faq .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mauve);
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-faq .breadcrumbs a {
  color: var(--slate);
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

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

.page-faq .breadcrumbs__sep {
  color: var(--line);
}

.page-faq .faq-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  align-items: center;
}

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

.page-faq .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 16px;
}

.page-faq .eyebrow::before {
  content: "";
  width: 34px;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}

.page-faq .faq-hero h1 {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(28px, 4.6vw, 46px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  margin: 0 0 18px;
  max-width: 20ch;
}

.page-faq .faq-hero__lead {
  font-size: 15px;
  line-height: 1.85;
  color: var(--slate);
  margin: 0 0 26px;
  max-width: 46ch;
}

.page-faq .faq-hero__quick {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .faq-hero__quick .btn {
  font-size: 14px;
}

.page-faq .faq-hero__figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
  overflow: hidden;
  background: var(--ink-800);
}

.page-faq .faq-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.05);
}

.page-faq .faq-hero__figure .media-frame__tag {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 7px 14px;
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-900);
  background: var(--amber);
  clip-path: polygon(0 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
}

/* ---------- 指标带 ---------- */
.page-faq .faq-stats {
  background: var(--ink-800);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-stats__inner {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--faq-hair);
}

.page-faq .faq-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 18px;
  background: var(--ink-800);
}

.page-faq .faq-stat__value {
  font-size: clamp(24px, 3.6vw, 34px);
  font-weight: 600;
  line-height: 1;
  color: var(--cyan);
}

.page-faq .faq-stat:nth-child(2n) .faq-stat__value {
  color: var(--amber);
}

.page-faq .faq-stat:nth-child(3n) .faq-stat__value {
  color: var(--acid);
}

.page-faq .faq-stat__label {
  font-size: 12px;
  line-height: 1.6;
  color: var(--slate);
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 40px);
  padding-top: clamp(32px, 5vw, 60px);
  padding-bottom: clamp(40px, 6vw, 80px);
}

.page-faq .faq-index {
  padding: 18px 16px 16px;
  border: 1px solid var(--line);
  background: var(--faq-panel);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}

.page-faq .faq-index__title {
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--mauve);
  margin: 0 0 14px;
}

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

.page-faq .faq-index__list a {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 9px 8px;
  border-left: 2px solid transparent;
  font-size: 14px;
  color: var(--slate);
  transition: background 0.22s var(--ease), color 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-faq .faq-index__list a:hover,
.page-faq .faq-index__list a:focus-visible {
  background: rgba(38, 224, 255, 0.08);
  border-left-color: var(--cyan);
  color: var(--white);
}

.page-faq .faq-index__num {
  font-size: 11px;
  color: var(--amber);
}

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

.page-faq .faq-index__count {
  font-size: 11px;
  color: var(--mauve);
}

.page-faq .faq-index__note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--faq-hair);
  font-size: 12px;
  line-height: 1.75;
  color: var(--mauve);
}

/* ---------- 问答组 ---------- */
.page-faq .faq-sections {
  min-width: 0;
  display: grid;
  gap: clamp(36px, 5vw, 56px);
}

.page-faq .faq-group,
.page-faq .faq-terms {
  scroll-margin-top: 24px;
}

.page-faq .faq-group__head {
  position: relative;
  padding-left: 16px;
  border-left: 2px solid var(--line);
  margin-bottom: 20px;
}

.page-faq .faq-group__head .index-num {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--amber);
  display: block;
  margin-bottom: 8px;
}

.page-faq .faq-group__head h2 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(20px, 2.6vw, 26px);
  line-height: 1.35;
  margin: 0 0 10px;
  color: var(--white);
}

.page-faq .faq-group__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate);
  max-width: 60ch;
}

.page-faq .qa {
  border: 1px solid var(--line);
  border-left: 2px solid var(--line);
  background: var(--faq-panel);
  margin-bottom: 10px;
  transition: border-color 0.24s var(--ease), background 0.24s var(--ease);
}

.page-faq .qa:hover {
  border-color: rgba(38, 224, 255, 0.42);
}

.page-faq .qa[open] {
  border-left-color: var(--cyan);
  background: var(--faq-panel-strong);
}

.page-faq .qa__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--white);
}

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

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

.page-faq .qa__num {
  flex: none;
  padding-top: 2px;
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--mauve);
}

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

.page-faq .qa__sign {
  position: relative;
  flex: none;
  width: 12px;
  height: 12px;
  margin-top: 6px;
  margin-left: auto;
}

.page-faq .qa__sign::before,
.page-faq .qa__sign::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform 0.24s var(--ease), opacity 0.24s var(--ease);
}

.page-faq .qa__sign::before {
  left: 0;
  right: 0;
  top: 50%;
  height: 2px;
  transform: translateY(-50%);
}

.page-faq .qa__sign::after {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  transform: translateX(-50%);
}

.page-faq .qa[open] .qa__sign::after {
  transform: translateX(-50%) scaleY(0);
  opacity: 0;
}

.page-faq .qa__a {
  padding: 0 16px 18px;
  border-top: 1px solid var(--faq-hair);
  padding-top: 14px;
}

.page-faq .qa__a p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--slate);
}

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

.page-faq .qa__steps,
.page-faq .qa__list {
  margin: 0 0 12px;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--slate);
}

.page-faq .qa__steps li,
.page-faq .qa__list li {
  margin-bottom: 5px;
}

.page-faq .qa__steps li::marker {
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 12px;
}

.page-faq .qa__list li::marker {
  color: var(--amber);
}

/* ---------- 术语速查 ---------- */
.page-faq .faq-terms {
  padding-top: clamp(24px, 4vw, 36px);
  border-top: 1px solid var(--line);
}

.page-faq .faq-group__head--terms {
  border-left-color: var(--amber);
}

.page-faq .faq-terms__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-faq .term-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-faq .term-card {
  padding: 16px 16px 18px;
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(38, 224, 255, 0.06), rgba(12, 21, 51, 0.9) 46%);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  transition: transform 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-faq .term-card:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 177, 59, 0.5);
}

.page-faq .term-card__tag {
  margin: 0 0 8px;
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--mauve);
}

.page-faq .term-card h3 {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--white);
}

.page-faq .term-card p {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--slate);
}

.page-faq .faq-terms__figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  overflow: hidden;
  background: var(--ink-800);
}

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

.page-faq .faq-terms__figure .media-frame__tag {
  position: absolute;
  right: 0;
  top: 0;
  padding: 6px 12px;
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--ink-900);
  background: var(--acid);
}

/* ---------- 下一步 ---------- */
.page-faq .faq-next {
  padding: clamp(22px, 3vw, 30px) 0 0;
  border-top: 1px solid var(--line);
}

.page-faq .faq-next h2 {
  font-family: var(--font-heading);
  font-size: clamp(19px, 2.4vw, 24px);
  font-weight: 700;
  margin: 0 0 10px;
}

.page-faq .faq-next > p {
  margin: 0 0 20px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate);
}

.page-faq .faq-next__links {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
}

.page-faq .faq-next__link {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  grid-template-rows: auto auto;
  column-gap: 12px;
  align-items: baseline;
  padding: 13px 14px;
  border: 1px solid var(--line);
  background: rgba(12, 21, 51, 0.55);
  transition: border-color 0.22s var(--ease), background 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-faq .faq-next__link:hover,
.page-faq .faq-next__link:focus-visible {
  border-color: var(--cyan);
  background: rgba(38, 224, 255, 0.07);
  transform: translateY(-2px);
}

.page-faq .faq-next__link .mono {
  grid-row: span 2;
  font-size: 11px;
  color: var(--amber);
  align-self: center;
}

.page-faq .faq-next__link-title {
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 600;
  color: var(--white);
}

.page-faq .faq-next__link-desc {
  font-size: 12px;
  line-height: 1.7;
  color: var(--mauve);
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-faq .faq-stats__inner {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    align-items: center;
    gap: clamp(32px, 5vw, 64px);
  }

  .page-faq .faq-stats__inner {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-faq .faq-stat {
    padding: 24px 20px;
  }

  .page-faq .qa__q {
    padding: 17px 20px;
    font-size: 16px;
  }

  .page-faq .qa__a {
    padding: 16px 20px 20px;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-body {
    grid-template-columns: minmax(0, 232px) minmax(0, 1fr);
    column-gap: clamp(32px, 4vw, 56px);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 24px;
  }

  .page-faq .faq-terms__layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 300px);
    align-items: start;
    gap: 28px;
  }

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

@media (min-width: 1180px) {
  .page-faq .faq-hero h1 {
    max-width: 18ch;
  }

  .page-faq .term-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-terms__layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 260px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa__sign::before,
  .page-faq .qa__sign::after,
  .page-faq .term-card,
  .page-faq .faq-next__link,
  .page-faq .faq-index__list a {
    transition: none;
  }

  .page-faq .term-card:hover,
  .page-faq .faq-next__link:hover {
    transform: none;
  }
}