.page-faq {
  --faq-line: var(--ink-700);
  --faq-text: rgba(233, 240, 248, 0.82);
  padding-bottom: clamp(56px, 8vw, 96px);
  overflow-x: clip;
}

.page-faq *,
.page-faq *::before,
.page-faq *::after {
  box-sizing: border-box;
}

.page-faq img {
  max-width: 100%;
  height: auto;
}

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

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  display: grid;
  gap: 32px;
  padding: clamp(26px, 5vw, 44px) 0 clamp(38px, 6vw, 64px);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  left: -12%;
  right: -12%;
  top: -14%;
  height: 420px;
  background:
    radial-gradient(58% 78% at 78% 4%, rgba(43, 224, 230, 0.16), transparent 70%),
    radial-gradient(52% 70% at 6% 24%, rgba(255, 122, 24, 0.1), transparent 72%);
  pointer-events: none;
}

.page-faq .faq-hero > * {
  position: relative;
}

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

.page-faq .faq-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 7.2vw, 74px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--fog);
}

.page-faq .faq-hero__lead {
  margin: 20px 0 0;
  max-width: 48ch;
  font-size: clamp(15px, 2.2vw, 17px);
  line-height: 1.85;
  color: var(--faq-text);
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-chip {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--faq-line);
  background: var(--ink-900);
  font-family: var(--font-label);
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--steel);
}

.page-faq .faq-chip b {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 14px;
  color: var(--cyan);
}

.page-faq .faq-hero__figure {
  position: relative;
  margin: 0;
  border: 2px solid var(--faq-line);
  background: var(--ink-800);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-hero__figure img {
  display: block;
  width: 100%;
}

.page-faq .faq-hero__stamp {
  position: absolute;
  left: -2px;
  bottom: -2px;
  padding: 6px 12px;
  background: var(--cyan);
  color: var(--ink-950);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.12em;
}

/* ---------- 两栏骨架 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: 32px;
  align-items: start;
}

/* ---------- 目录 ---------- */
.page-faq .faq-index {
  border: 2px solid var(--faq-line);
  background: var(--ink-900);
  padding: 18px;
}

.page-faq .faq-index__title {
  margin: 0 0 14px;
  font-family: var(--font-label);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--steel);
}

.page-faq .faq-index__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 10px;
  border-left: 2px solid transparent;
  color: var(--fog);
  font-size: 14px;
  line-height: 1.4;
  text-decoration: none;
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  border-left-color: var(--cyan);
  background: var(--cyan-08);
  color: var(--cyan);
}

.page-faq .faq-index__n {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--steel);
}

/* ---------- 分组 ---------- */
.page-faq .faq-main {
  display: grid;
  gap: clamp(36px, 6vw, 56px);
  min-width: 0;
}

.page-faq .faq-group {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-faq .faq-group__head {
  display: flex;
  align-items: flex-end;
  gap: 14px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--faq-line);
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(28px, 5vw, 44px);
  line-height: 0.86;
  color: var(--ink-800);
  -webkit-text-stroke: 1.5px var(--cyan);
}

.page-faq .faq-group h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 3.4vw, 32px);
  letter-spacing: -0.01em;
  color: var(--fog);
}

.page-faq .faq-group__intro {
  margin: 14px 0 4px;
  max-width: 60ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--steel);
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa {
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .qa summary {
  position: relative;
  display: block;
  padding: 17px 46px 17px 0;
  list-style: none;
  cursor: pointer;
  font-size: clamp(15px, 2.2vw, 17px);
  font-weight: 600;
  line-height: 1.6;
  color: var(--fog);
  transition: color 0.2s var(--ease);
}

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

.page-faq .qa summary::after {
  content: "＋";
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 600;
  color: var(--cyan);
}

.page-faq .qa summary:hover {
  color: var(--cyan);
}

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

.page-faq .qa[open] summary::after {
  content: "－";
  color: var(--orange);
}

.page-faq .qa__body {
  max-width: 68ch;
  padding: 0 0 20px;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--faq-text);
}

.page-faq .qa__body p {
  margin: 0 0 10px;
}

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

.page-faq .qa__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-16);
}

.page-faq .qa__body a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 章节配图 ---------- */
.page-faq .faq-figure {
  margin: 22px 0 8px;
  border: 2px solid var(--faq-line);
  background: var(--ink-800);
  box-shadow: 6px 6px 0 rgba(5, 8, 15, 0.92);
}

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

.page-faq .faq-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--faq-line);
  font-family: var(--font-label);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--steel);
}

/* ---------- 收尾 ---------- */
.page-faq .faq-help {
  display: grid;
  gap: 18px;
  margin-top: clamp(8px, 2vw, 16px);
  padding: clamp(22px, 4.5vw, 40px);
  border: 2px solid var(--faq-line);
  border-left: 6px solid var(--orange);
  background: linear-gradient(135deg, var(--ink-800), var(--ink-900));
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-help h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 4vw, 36px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--fog);
}

.page-faq .faq-help p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--faq-text);
}

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

.page-faq .faq-help__contact {
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--steel);
  word-break: break-word;
}

.page-faq .faq-help__fine {
  font-size: 13px;
  color: var(--steel);
}

.page-faq .faq-help__fine a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-16);
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: end;
    gap: 52px;
  }

  .page-faq .faq-hero__figure {
    margin-bottom: 6px;
  }
}

@media (min-width: 980px) {
  .page-faq .faq-body {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 64px);
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

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

  .page-faq .faq-index__link {
    font-size: 14.5px;
    padding: 10px 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa summary,
  .page-faq .faq-index__link {
    transition: none;
  }
}