.page-faq {
  --faq-rail-w: 248px;
  --faq-sticky-top: 108px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(24px, 4vw, 44px) 0 clamp(36px, 6vw, 68px);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: -30% -12% auto -12%;
  height: 460px;
  background:
    radial-gradient(58% 68% at 18% 42%, rgba(79, 224, 208, 0.14), transparent 70%),
    radial-gradient(52% 62% at 86% 12%, rgba(255, 201, 74, 0.13), transparent 72%);
  pointer-events: none;
  z-index: 0;
}

.page-faq .faq-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 46px);
  align-items: center;
}

.page-faq .faq-hero h1 {
  margin: 0.18em 0 0.36em;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 7vw, 84px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  text-shadow:
    0 0 26px rgba(255, 201, 74, 0.16),
    0 0 62px rgba(79, 224, 208, 0.12);
}

.page-faq .faq-hero__copy .lede {
  max-width: 46ch;
}

.page-faq .faq-hero__copy .muted {
  margin-top: 14px;
  font-size: 14.5px;
}

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

.page-faq .faq-hero__figure img,
.page-faq .faq-guide img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 主线速查 ---------- */
.page-faq .faq-lines {
  padding: clamp(28px, 4vw, 52px) 0 clamp(36px, 5vw, 64px);
}

.page-faq .faq-lines__list {
  list-style: none;
  margin: clamp(22px, 3.4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-c);
  overflow: hidden;
}

.page-faq .faq-line {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(18px, 3vw, 28px);
  background: var(--panel);
  transition: background 0.18s ease;
}

.page-faq .faq-line::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 0;
  background: linear-gradient(180deg, var(--gold), var(--teal));
  transition: height 0.26s ease;
}

.page-faq .faq-line:hover,
.page-faq .faq-line:focus-within {
  background: #13161e;
}

.page-faq .faq-line:hover::after,
.page-faq .faq-line:focus-within::after {
  height: 100%;
}

.page-faq .faq-line__no {
  margin: 0;
  color: var(--teal);
  font-size: 12px;
  letter-spacing: 0.16em;
}

.page-faq .faq-line h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.2vw, 24px);
  font-weight: 800;
  line-height: 1.3;
}

.page-faq .faq-line h3 a {
  color: var(--text);
  text-decoration: none;
  transition: color 0.18s ease;
}

.page-faq .faq-line h3 a::after {
  content: "";
  position: absolute;
  inset: 0;
}

.page-faq .faq-line:hover h3 a,
.page-faq .faq-line:focus-within h3 a {
  color: var(--gold);
}

.page-faq .faq-line__desc {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

.page-faq .faq-line__meta {
  margin: auto 0 0;
  color: var(--gold-dim);
  font-size: 12px;
  letter-spacing: 0.1em;
}

/* ---------- 主体：粘性索引 + 折叠问答 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 56px);
  padding-top: clamp(20px, 3vw, 40px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-faq .faq-rail {
  display: none;
}

.page-faq .faq-rail__title {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold-dim);
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 11px 10px 11px 16px;
  border-left: 2px solid transparent;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.5;
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.page-faq .faq-rail__link .mono {
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--teal);
  transition: color 0.18s ease;
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--text);
  border-left-color: var(--gold);
  background: rgba(255, 201, 74, 0.06);
}

.page-faq .faq-rail__link:hover .mono,
.page-faq .faq-rail__link:focus-visible .mono {
  color: var(--gold);
}

.page-faq .faq-rail__hint {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.75;
}

.page-faq .faq-guide {
  margin: 0 0 clamp(28px, 4vw, 48px);
}

/* ---------- 问答区块 ---------- */
.page-faq .faq-block {
  padding-top: clamp(30px, 5vw, 62px);
  scroll-margin-top: 112px;
}

.page-faq .faq-block + .faq-block {
  border-top: 1px solid var(--line);
  margin-top: clamp(28px, 4.4vw, 56px);
}

.page-faq .faq-block__no {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0 0 10px;
  color: var(--gold-dim);
  font-size: 13px;
  letter-spacing: 0.22em;
  transition: color 0.3s ease;
}

.page-faq .faq-block__no::after {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  background: linear-gradient(90deg, rgba(255, 201, 74, 0.5), rgba(79, 224, 208, 0.16) 58%, transparent);
}

.page-faq .faq-block.is-current .faq-block__no {
  color: var(--gold);
}

.page-faq .faq-block__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(25px, 3.4vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-faq .faq-block__lede {
  margin: 12px 0 0;
  max-width: 62ch;
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.85;
}

.page-faq .faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: clamp(18px, 3vw, 30px);
}

.page-faq .faq-item {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-b);
  overflow: hidden;
  transition: border-color 0.18s ease;
}

.page-faq .faq-item:hover {
  border-color: var(--gold-dim);
}

.page-faq .faq-item > summary {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: clamp(15px, 2.4vw, 21px) clamp(15px, 2.6vw, 26px);
  cursor: pointer;
  list-style: none;
  color: var(--text);
  font-size: clamp(15.5px, 1.8vw, 17.5px);
  font-weight: 700;
  line-height: 1.6;
  transition: color 0.18s ease;
}

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

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

.page-faq .faq-item__no {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  margin-top: 1px;
  border: 1px solid var(--teal-dim);
  border-radius: 50%;
  color: var(--teal);
  font-size: 11px;
  transition: border-color 0.18s ease, color 0.18s ease;
}

.page-faq .faq-item[open] {
  border-color: var(--gold-dim);
}

.page-faq .faq-item[open]::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), var(--teal) 52%, transparent);
}

.page-faq .faq-item[open] > summary {
  color: var(--gold);
}

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

.page-faq .faq-item__a {
  padding: 14px clamp(15px, 2.6vw, 26px) clamp(17px, 2.6vw, 24px);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.85;
}

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 68ch;
}

/* ---------- 联系支持 ---------- */
.page-faq .faq-support {
  padding: clamp(40px, 6vw, 88px) 0 clamp(48px, 7vw, 104px);
  border-top: 1px solid var(--line);
  background:
    radial-gradient(70% 90% at 8% 0%, rgba(79, 224, 208, 0.07), transparent 70%),
    var(--ink);
  scroll-margin-top: 112px;
}

.page-faq .faq-support__lede {
  margin: 14px 0 0;
}

.page-faq .faq-support__sub {
  margin: clamp(22px, 3vw, 32px) 0 0;
  color: var(--gold-dim);
  font-size: 13px;
  letter-spacing: 0.12em;
}

.page-faq .faq-support__tips {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-faq .faq-support__tips li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

.page-faq .faq-tip-no {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  margin-top: 3px;
  border: 1px solid var(--teal-dim);
  border-radius: 50%;
  background: rgba(79, 224, 208, 0.1);
  color: var(--teal);
  font-family: var(--font-mono);
  font-size: 11px;
}

.page-faq .faq-support__panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: clamp(20px, 3vw, 30px);
  align-self: start;
}

.page-faq .faq-contact-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-contact-row:last-of-type {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-faq .faq-contact-row__k {
  flex: 0 0 auto;
  color: var(--gold-dim);
  font-size: 11.5px;
  letter-spacing: 0.16em;
}

.page-faq .faq-contact-row__v {
  flex: 1 1 auto;
  min-width: 0;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 14.5px;
  line-height: 1.6;
  word-break: break-all;
}

.page-faq .faq-support__note {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
}

.page-faq .faq-support__cta {
  align-self: flex-start;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-item__a {
    padding-left: calc(clamp(15px, 2.6vw, 26px) + 40px);
  }
}

@media (min-width: 720px) {
  .page-faq .faq-lines__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(28px, 4vw, 52px);
  }
}

@media (min-width: 960px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: clamp(34px, 5vw, 72px);
  }

  .page-faq .faq-rail {
    display: block;
    position: sticky;
    top: var(--faq-sticky-top);
    align-self: start;
    border-left: 1px solid var(--line);
    padding-left: 0;
  }
}

@media (min-width: 1100px) {
  .page-faq .faq-lines__list {
    grid-template-columns: 1.2fr 1fr 1fr 1.1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-line::after,
  .page-faq .faq-item,
  .page-faq .faq-item__no,
  .page-faq .faq-rail__link,
  .page-faq .faq-block__no {
    transition: none;
  }
}
</main>