.page-faq {
  --faq-index-w: 248px;
  --faq-gap: clamp(18px, 3vw, 40px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(30px, 5vw, 64px) 0 clamp(26px, 4vw, 46px);
  isolation: isolate;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    linear-gradient(112deg, rgba(53, 224, 240, 0.16) 0%, rgba(53, 224, 240, 0) 54%),
    linear-gradient(292deg, rgba(240, 179, 90, 0.15) 0%, rgba(240, 179, 90, 0) 50%);
  clip-path: polygon(0 0, 100% 0, 100% 68%, 0 100%);
}

.page-faq .faq-hero__title {
  margin: 14px 0 18px;
  font-size: clamp(2rem, 6.6vw, 4rem);
  line-height: 1.02;
  letter-spacing: -0.01em;
  color: var(--fg-strong);
}

.page-faq .faq-hero__lede {
  max-width: 50ch;
  color: var(--fg);
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 26px;
}

/* ---------- 框架：左索引 + 右内容 ---------- */
.page-faq .faq-frame {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
  margin-top: clamp(10px, 2vw, 22px);
}

.page-faq .faq-index {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.page-faq .faq-index__title {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 8px 9px 0;
  font-size: 0.9rem;
  color: var(--fg);
  text-decoration: none;
  border-bottom: 1px solid var(--line-soft);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .faq-index__link .mono {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

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

.page-faq .faq-index__note {
  margin: 0;
  padding-left: 12px;
  border-left: 2px solid var(--amber);
  font-size: 0.8rem;
  line-height: 1.75;
  color: var(--muted);
}

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

/* ---------- 章节 ---------- */
.page-faq .faq-sec {
  padding-top: clamp(30px, 5vw, 56px);
  margin-top: clamp(30px, 5vw, 56px);
  border-top: 1px solid var(--line);
  scroll-margin-top: 96px;
}

.page-faq .faq-sec:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.page-faq .faq-sec .serif-title {
  margin: 10px 0 12px;
  font-size: clamp(1.3rem, 2.8vw, 1.85rem);
  color: var(--fg-strong);
}

.page-faq .faq-sec__note {
  max-width: 64ch;
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 四步路径 ---------- */
.page-faq .faq-route {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-faq .faq-route__card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 18px 18px;
  background: var(--ink-2);
}

.page-faq .faq-route__card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
  opacity: 0.85;
}

.page-faq .faq-route__num {
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-faq .faq-route__title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.04rem;
  font-weight: 600;
  color: var(--fg-strong);
}

.page-faq .faq-route__text {
  flex: 1 1 auto;
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.72;
  color: var(--muted);
}

.page-faq .faq-route__card .btn {
  align-self: flex-start;
  margin-top: 6px;
}

/* ---------- 图片 ---------- */
.page-faq .faq-figure {
  margin: clamp(22px, 3.5vw, 36px) 0 0;
  padding: 10px;
  border: 1px solid var(--line);
  background: var(--ink-2);
}

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

.page-faq .faq-figure .figure__cap {
  padding: 10px 4px 2px;
  font-size: 0.76rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .faq-figure--narrow {
  max-width: 600px;
}

/* ---------- 筛选 ---------- */
.page-faq .filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: clamp(22px, 3vw, 32px) 0 6px;
}

.page-faq .filter__count {
  margin-left: auto;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 问答手风琴 ---------- */
.page-faq .qa-list {
  border-top: 1px solid var(--line);
}

.page-faq .qa {
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .qa__q {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 4px 16px 0;
  list-style: none;
  cursor: pointer;
  font-size: 0.96rem;
  line-height: 1.55;
  color: var(--fg-strong);
  transition: color 0.2s var(--ease);
}

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

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

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

.page-faq .qa__num {
  flex: none;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-faq .qa__text {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .qa__tag {
  flex: none;
}

.page-faq .qa__q::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1;
  color: var(--amber);
}

.page-faq .qa[open] .qa__q::after {
  content: "−";
}

.page-faq .qa__a {
  padding: 0 4px 22px 0;
}

.page-faq .qa__cond {
  margin: 0 0 14px;
  padding: 12px 14px;
  border-left: 2px solid var(--cyan-deep);
  background: rgba(53, 224, 240, 0.07);
  font-size: 0.86rem;
  line-height: 1.8;
  color: var(--fg);
}

.page-faq .qa__cond-k {
  display: inline-block;
  margin-right: 8px;
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-faq .qa__steps {
  list-style: none;
  counter-reset: qs;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-faq .qa__steps li {
  counter-increment: qs;
  position: relative;
  padding-left: 28px;
  font-size: 0.86rem;
  line-height: 1.78;
  color: var(--fg);
}

.page-faq .qa__steps li::before {
  content: counter(qs, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--amber);
}

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

/* ---------- 入口勾选清单 ---------- */
.page-faq .steps {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .step {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 15px 16px;
  background: var(--ink-2);
  border-left: 2px solid var(--line);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-faq .step:has(.step__box:checked) {
  border-left-color: var(--cyan);
  background: rgba(53, 224, 240, 0.06);
}

.page-faq .step__box {
  appearance: none;
  -webkit-appearance: none;
  position: relative;
  flex: none;
  width: 18px;
  height: 18px;
  margin: 4px 0 0;
  border: 1px solid var(--line);
  background: transparent;
  cursor: pointer;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-faq .step__box:checked {
  border-color: var(--cyan);
  background: rgba(53, 224, 240, 0.18);
}

.page-faq .step__box:checked::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 1px;
  width: 5px;
  height: 10px;
  border-right: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
  transform: rotate(40deg);
}

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

.page-faq .step__label {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  min-width: 0;
  cursor: pointer;
}

.page-faq .step__num {
  flex: none;
  padding-top: 3px;
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--amber);
}

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

.page-faq .step__body strong {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--fg-strong);
}

.page-faq .step__body span {
  font-size: 0.84rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 排错清单 ---------- */
.page-faq .checks {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-faq .checks__item {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 12px;
  padding: 18px 0;
  border-top: 1px solid var(--line-soft);
}

.page-faq .checks__item:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .checks__num {
  padding-top: 2px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-faq .checks__title {
  margin: 0 0 6px;
  font-family: var(--font-sans);
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--fg-strong);
}

.page-faq .checks__item p {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.82;
  color: var(--muted);
}

/* ---------- 联系支持 ---------- */
.page-faq .support-card {
  position: relative;
  margin-top: clamp(20px, 3vw, 30px);
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--line);
  background: var(--ink-2);
}

.page-faq .support-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--amber), var(--cyan));
}

.page-faq .support-card__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-faq .support-card__k {
  margin: 0 0 4px;
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-faq .support-card__v {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.6;
  color: var(--fg-strong);
  word-break: break-word;
}

.page-faq .support-card__note {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
  font-size: 0.84rem;
  line-height: 1.82;
  color: var(--muted);
}

/* ---------- 术语表 ---------- */
.page-faq .gloss {
  margin-top: clamp(20px, 3vw, 30px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-faq .gloss__item {
  padding: 16px 16px 18px;
  background: var(--cream);
  border-left: 3px solid var(--amber-deep);
}

.page-faq .gloss__key {
  margin: 0 0 6px;
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--amber-deep);
}

.page-faq .gloss__def {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.78;
  color: var(--black);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .support-card__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-faq .faq-route {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-faq .gloss {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 980px) {
  .page-faq .faq-frame {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    align-items: start;
  }
  .page-faq .faq-index {
    position: sticky;
    top: 104px;
  }
  .page-faq .faq-route {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1160px) {
  .page-faq .gloss {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .page-faq .qa__tag {
    display: none;
  }
  .page-faq .faq-route__card {
    padding: 20px 16px 16px;
  }
  .page-faq .filter__count {
    width: 100%;
    margin-left: 0;
  }
}

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