.page-faq {
  --faq-gap: clamp(20px, 3.4vw, 42px);
  --faq-surface: rgba(11, 20, 24, .72);
  --faq-line: rgba(34, 211, 238, .38);
}

.page-faq h1 {
  margin: 0;
  font-size: clamp(32px, 5.4vw, 60px);
  line-height: 1.08;
  letter-spacing: -.02em;
  font-weight: 900;
}

.page-faq h2 {
  margin: 0;
  font-size: clamp(23px, 3vw, 36px);
  line-height: 1.2;
  letter-spacing: -.02em;
  font-weight: 900;
}

.page-faq h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
}

.page-faq a:focus-visible,
.page-faq summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  padding-top: calc(var(--header-h) + clamp(14px, 4vw, 38px));
  padding-bottom: clamp(26px, 4vw, 52px);
}

.page-faq .faq-frame {
  margin-top: clamp(16px, 3vw, 28px);
  padding: 0;
  overflow: hidden;
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(26, 18, 51, .85) 0%, rgba(5, 7, 11, .2) 55%),
    linear-gradient(160deg, rgba(11, 20, 24, .94), rgba(5, 7, 11, .86));
}

.page-faq .faq-frame__inner {
  display: grid;
  gap: var(--faq-gap);
  padding: clamp(20px, 3.6vw, 48px);
}

.page-faq .faq-hero__lead h1 {
  margin: 14px 0 16px;
  max-width: 22ch;
}

.page-faq .faq-hero__lead .page-head__lead {
  max-width: 60ch;
  color: var(--paper-soft);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 20px;
  margin-top: 26px;
}

.page-faq .faq-hero__card {
  padding: 22px;
  border-radius: var(--r-lg);
  background: rgba(34, 211, 238, .06);
  border: 1px solid var(--line-soft);
}

.page-faq .faq-hero__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 13px;
}

.page-faq .faq-hero__list li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper-soft);
}

.page-faq .faq-hero__list .mono {
  color: var(--cyan);
  font-size: 13px;
  letter-spacing: .08em;
  flex: 0 0 auto;
}

/* ---------- 主体框架 ---------- */

.page-faq .faq-body {
  padding-top: 0;
}

.page-faq .faq-layout {
  display: grid;
  gap: var(--faq-gap);
  align-items: start;
}

.page-faq .faq-toc {
  padding: 16px;
  border-radius: var(--r-lg);
  background: var(--faq-surface);
  border: 1px solid var(--line-soft);
}

.page-faq .faq-toc__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-faq .faq-toc__list::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-toc__link {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 9px 12px;
  border-radius: var(--r-sm);
  border-left: 2px solid transparent;
  color: var(--paper-dim);
  text-decoration: none;
  font-size: 14px;
  white-space: nowrap;
  transition: color .22s var(--ease), background .22s var(--ease), border-color .22s var(--ease);
}

.page-faq .faq-toc__link:hover,
.page-faq .faq-toc__link:focus-visible {
  color: var(--cyan);
  background: rgba(34, 211, 238, .08);
  border-left-color: var(--cyan);
}

.page-faq .faq-toc__idx {
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--muted);
}

.page-faq .faq-content {
  display: grid;
  gap: clamp(34px, 5vw, 64px);
  min-width: 0;
}

.page-faq .faq-block {
  display: grid;
  gap: 20px;
  min-width: 0;
}

.page-faq .section__head {
  display: grid;
  gap: 10px;
  max-width: 64ch;
}

.page-faq .faq-lead {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--paper-soft);
}

.page-faq .faq-split {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  min-width: 0;
}

/* ---------- 三步 ---------- */

.page-faq .step-list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  min-width: 0;
}

.page-faq .step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 18px 20px;
  border-radius: var(--r-md);
  background: rgba(231, 246, 248, .035);
  border: 1px solid var(--line-soft);
}

.page-faq .step__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 46px;
  padding: 8px 0;
  border-radius: 999px;
  background: rgba(34, 211, 238, .13);
  border: 1px solid var(--line);
  color: var(--cyan);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .06em;
  line-height: 1;
}

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

.page-faq .step__title {
  margin-bottom: 6px;
  color: var(--paper);
}

.page-faq .step__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--paper-soft);
}

.page-faq .faq-figure {
  margin: 0;
  display: grid;
  gap: 10px;
  min-width: 0;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r-lg);
  border: 1px solid var(--line-soft);
  background: var(--panel);
}

.page-faq .faq-figure figcaption {
  font-size: 12px;
  letter-spacing: .06em;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 回访导航 ---------- */

.page-faq .nav-explain {
  display: grid;
  gap: 16px;
  min-width: 0;
}

.page-faq .nav-explain p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--paper-soft);
}

.page-faq .nav-tree {
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 18px;
  border-left: 2px solid var(--faq-line);
  display: grid;
  gap: 10px;
}

.page-faq .nav-tree__root {
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
  line-height: 1.6;
}

.page-faq .nav-tree ul {
  list-style: none;
  margin: 10px 0 0;
  padding: 0 0 0 16px;
  border-left: 1px dashed var(--line-soft);
  display: grid;
  gap: 8px;
}

.page-faq .nav-tree ul li {
  font-size: 14px;
  font-weight: 400;
  line-height: 1.65;
  color: var(--paper-dim);
}

.page-faq .nav-tree strong {
  color: var(--lime);
  font-weight: 700;
}

/* ---------- 订阅 ---------- */

.page-faq .sub-grid {
  display: grid;
  gap: 16px;
  min-width: 0;
}

.page-faq .sub-card {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: 22px;
  border-radius: var(--r-lg);
  background: var(--faq-surface);
  border: 1px solid var(--line-soft);
}

.page-faq .sub-card__key {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-faq .sub-card h3 {
  color: var(--paper);
}

.page-faq .sub-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--paper-soft);
}

/* ---------- 对照 ---------- */

.page-faq .path {
  counter-reset: faqpath;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-faq .path li {
  counter-increment: faqpath;
  position: relative;
  padding: 15px 18px 15px 56px;
  border-radius: var(--r-md);
  background: linear-gradient(120deg, rgba(26, 18, 51, .78), rgba(11, 20, 24, .62));
  border: 1px solid var(--line-soft);
  font-size: 15px;
  line-height: 1.68;
  color: var(--paper-soft);
}

.page-faq .path li::before {
  content: counter(faqpath, decimal-leading-zero);
  position: absolute;
  left: 18px;
  top: 15px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-faq .dim-grid {
  display: grid;
  gap: 16px;
  min-width: 0;
}

.page-faq .dim-card {
  display: grid;
  gap: 8px;
  padding: 24px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: linear-gradient(150deg, rgba(14, 42, 46, .72), rgba(5, 7, 11, .55));
}

.page-faq .dim-card .num {
  line-height: 1;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4.4vw, 52px);
  font-weight: 800;
}

.page-faq .dim-card h3 {
  font-size: 16px;
  color: var(--paper);
}

.page-faq .dim-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--paper-soft);
}

/* ---------- 技巧 ---------- */

.page-faq .tips {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-faq .tips li {
  position: relative;
  padding: 16px 0 16px 30px;
  border-bottom: 1px solid var(--line-soft);
  font-size: 15px;
  line-height: 1.72;
  color: var(--paper-soft);
}

.page-faq .tips li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 25px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(34, 211, 238, .16);
}

/* ---------- 问答 ---------- */

.page-faq .qa-groups {
  display: grid;
  gap: 26px;
}

.page-faq .qa-group {
  display: grid;
  gap: 12px;
}

.page-faq .qa-group__head {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.page-faq .qa-list {
  display: grid;
  gap: 10px;
}

.page-faq .qa {
  border-radius: var(--r-md);
  background: var(--faq-surface);
  border: 1px solid var(--line-soft);
  border-left: 2px solid transparent;
  overflow: hidden;
  transition: border-color .28s var(--ease), background .28s var(--ease);
}

.page-faq .qa[open] {
  border-left-color: var(--lime);
  background: rgba(124, 246, 138, .05);
}

.page-faq .qa__q {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.55;
  color: var(--paper);
}

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

.page-faq .qa__q::marker {
  content: "";
}

.page-faq .qa__idx {
  flex: 0 0 auto;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
}

.page-faq .qa__mark {
  position: relative;
  flex: 0 0 auto;
  margin-left: auto;
  width: 20px;
  height: 20px;
}

.page-faq .qa__mark::before,
.page-faq .qa__mark::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  border-radius: 2px;
  transition: transform .28s var(--ease), opacity .28s var(--ease);
}

.page-faq .qa__mark::before {
  left: 0;
  right: 0;
  top: 9px;
  height: 2px;
}

.page-faq .qa__mark::after {
  top: 0;
  bottom: 0;
  left: 9px;
  width: 2px;
}

.page-faq .qa[open] .qa__mark::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-faq .qa__a {
  padding: 0 20px 20px;
}

.page-faq .qa__a p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--paper-soft);
}

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

/* ---------- 帮助入口 ---------- */

.page-faq .faq-help {
  padding: clamp(22px, 3.4vw, 36px);
  border-radius: var(--r-xl);
  background: linear-gradient(140deg, rgba(14, 42, 46, .8), rgba(5, 7, 11, .6));
  border: 1px solid var(--line-soft);
}

.page-faq .help-links {
  display: grid;
  gap: 12px;
}

.page-faq .help-link {
  display: grid;
  gap: 4px;
  padding: 16px 18px;
  border-radius: var(--r-md);
  background: rgba(5, 7, 11, .5);
  border: 1px solid var(--line-soft);
  text-decoration: none;
  transition: border-color .24s var(--ease), transform .24s var(--ease), background .24s var(--ease);
}

.page-faq .help-link:hover,
.page-faq .help-link:focus-visible {
  border-color: var(--cyan);
  background: rgba(34, 211, 238, .08);
  transform: translateY(-2px);
}

.page-faq .help-link__k {
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-faq .help-link__v {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-faq .step-list::before {
    content: "";
    position: absolute;
    left: 43px;
    top: 34px;
    bottom: 34px;
    width: 1px;
    background: linear-gradient(180deg, transparent, var(--faq-line) 18%, var(--faq-line) 82%, transparent);
  }

  .page-faq .step {
    position: relative;
    z-index: 1;
  }
}

@media (min-width: 720px) {
  .page-faq .sub-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 880px) {
  .page-faq .faq-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
  }
}

@media (min-width: 980px) {
  .page-faq .faq-frame__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, .8fr);
    align-items: end;
  }
}

@media (min-width: 1020px) {
  .page-faq .faq-layout {
    grid-template-columns: 236px minmax(0, 1fr);
  }

  .page-faq .faq-toc {
    position: sticky;
    top: calc(var(--header-h) + 20px);
  }

  .page-faq .faq-toc__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-faq .faq-toc__link {
    white-space: normal;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .help-link:hover,
  .page-faq .help-link:focus-visible {
    transform: none;
  }

  .page-faq .qa__mark::before,
  .page-faq .qa__mark::after {
    transition: opacity .2s linear;
  }
}