.page-faq {
  --faq-index-w: 218px;
  --faq-gutter: clamp(28px, 4.5vw, 72px);
  box-sizing: border-box;
  max-width: var(--shell-w);
  margin: 0 auto;
  padding: clamp(28px, 5vw, 56px) clamp(18px, 5vw, 56px) clamp(64px, 9vw, 120px);
}

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

/* ---------- 首屏 ---------- */

.page-faq__hero {
  position: relative;
  padding-bottom: clamp(26px, 4vw, 44px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(130% 150% at 100% 0%, rgba(53, 240, 224, 0.1) 0%, rgba(53, 240, 224, 0) 58%),
    linear-gradient(180deg, rgba(14, 21, 51, 0.85) 0%, rgba(14, 21, 51, 0) 100%);
}

.page-faq__hero .crumbs {
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-faq__eyebrow {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--violet);
}

.page-faq__title {
  margin: 14px 0 0;
  max-width: 24ch;
  font-size: clamp(28px, 5.6vw, 46px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-faq__lede {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--text);
}

/* ---------- 主体骨架 ---------- */

.page-faq__body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-gutter);
  margin-top: clamp(30px, 4.5vw, 56px);
}

.page-faq__index {
  min-width: 0;
}

.page-faq__index-eyebrow {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--violet);
}

.page-faq__index-title {
  margin: 0 0 14px;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
}

.page-faq__idx-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 2px 12px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-faq__idx-list li {
  flex: none;
}

.page-faq__idx-list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  background: var(--ink-800);
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-faq__idx-list a:hover,
.page-faq__idx-list a:focus-visible {
  color: var(--white);
  border-color: var(--cyan);
  background: var(--ink-700);
}

.page-faq__idx-num {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-faq__index-note {
  margin: 14px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--line);
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

.page-faq__stream {
  min-width: 0;
}

/* ---------- 章节 ---------- */

.page-faq .faq-sec {
  margin-top: clamp(30px, 4.5vw, 52px);
  padding-top: clamp(30px, 4.5vw, 52px);
  border-top: 1px solid var(--line);
}

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

.page-faq .faq-sec__num {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--cyan);
}

.page-faq .faq-sec__title {
  margin: 0;
  max-width: 26ch;
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 800;
  line-height: 1.26;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-faq .faq-sec__lede {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.88;
  color: var(--text);
}

/* ---------- 问题条目 ---------- */

.page-faq .qa-list {
  margin: 22px 0 0;
  border-bottom: 1px solid var(--line);
}

.page-faq .qa {
  border-top: 1px solid var(--line);
  background: transparent;
  transition: background-color 0.2s var(--ease);
}

.page-faq .qa[open] {
  background: linear-gradient(180deg, rgba(53, 240, 224, 0.06) 0%, rgba(53, 240, 224, 0) 72%);
}

.page-faq .qa__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 2px;
  cursor: pointer;
  list-style: none;
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.65;
  color: var(--text);
  transition: color 0.2s var(--ease);
}

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

.page-faq .qa__q:hover,
.page-faq .qa[open] > .qa__q {
  color: var(--white);
}

.page-faq .qa__idx {
  flex: none;
  padding-top: 3px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--violet);
  transition: color 0.2s var(--ease);
}

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

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

.page-faq .qa__mark {
  position: relative;
  flex: none;
  width: 18px;
  height: 18px;
  margin-top: 4px;
  margin-left: auto;
}

.page-faq .qa__mark::before,
.page-faq .qa__mark::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform 0.22s var(--ease), opacity 0.22s var(--ease);
}

.page-faq .qa__mark::before {
  left: 0;
  top: 8px;
  width: 18px;
  height: 2px;
}

.page-faq .qa__mark::after {
  left: 8px;
  top: 0;
  width: 2px;
  height: 18px;
}

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

.page-faq .qa__a {
  max-width: 70ch;
  padding: 0 26px 20px 0;
}

.page-faq .qa__a p {
  margin: 0;
  font-size: 15px;
  line-height: 1.92;
  color: var(--muted);
}

.page-faq .qa__a p + p {
  margin-top: 12px;
}

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

.page-faq .qa__a a:hover {
  color: var(--white);
}

.page-faq .qa__steps {
  display: grid;
  gap: 12px;
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: faq-step;
}

.page-faq .qa__steps li {
  position: relative;
  padding-left: 40px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
  counter-increment: faq-step;
}

.page-faq .qa__steps li::before {
  content: counter(faq-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  padding: 2px 5px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  line-height: 1.2;
  color: var(--cyan);
}

.page-faq .qa__steps + p {
  margin-top: 16px;
}

.page-faq .qa__flow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 14px;
  padding: 10px 14px;
  border-left: 2px solid var(--lime);
  background: rgba(184, 255, 60, 0.07);
  font-size: 14px;
  line-height: 1.7;
  color: var(--text);
}

.page-faq .qa__flow-icon {
  flex: none;
  color: var(--lime);
}

/* ---------- 配图 ---------- */

.page-faq .faq-figure {
  margin: 26px 0 0;
  background: var(--ink-800);
  border: 1px solid var(--line);
  overflow: hidden;
  clip-path: polygon(
    0 0,
    calc(100% - var(--cut)) 0,
    100% var(--cut),
    100% 100%,
    0 100%
  );
}

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

.page-faq .faq-figure__cap {
  padding: 12px 16px 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 客服面板 ---------- */

.page-faq__support {
  margin-top: 24px;
  padding: clamp(22px, 3.4vw, 34px);
  border: 1px solid var(--line);
  background:
    radial-gradient(120% 160% at 0% 0%, rgba(138, 92, 255, 0.18) 0%, rgba(138, 92, 255, 0) 62%),
    var(--ink-800);
  clip-path: polygon(
    0 0,
    calc(100% - 20px) 0,
    100% 20px,
    100% 100%,
    20px 100%,
    0 calc(100% - 20px)
  );
}

.page-faq__support-title {
  margin: 0 0 14px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
}

.page-faq__support-title--sub {
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-size: 16px;
}

.page-faq__contact {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq__contact li {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
  word-break: break-word;
}

.page-faq__contact .mono {
  min-width: 46px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-faq__mail-list {
  display: grid;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq__mail-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-faq__mail-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 9px;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 下一步入口 ---------- */

.page-faq__next {
  display: grid;
  gap: 10px;
  margin-top: 22px;
}

.page-faq__next-item {
  display: block;
  padding: 16px 18px;
  border: 1px solid var(--line);
  background: var(--ink-800);
  text-decoration: none;
  transition: border-color 0.22s var(--ease), transform 0.22s var(--ease), background-color 0.22s var(--ease);
}

.page-faq__next-item:hover,
.page-faq__next-item:focus-visible {
  border-color: var(--cyan);
  background: var(--ink-700);
  transform: translateX(4px);
}

.page-faq__next-k {
  display: block;
  margin-bottom: 8px;
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--violet);
}

.page-faq__next-t {
  display: block;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
}

/* ---------- 响应式 ---------- */

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

  .page-faq .qa__q {
    font-size: 16.5px;
    padding: 18px 2px;
  }
}

@media (min-width: 1024px) {
  .page-faq__body {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq__index {
    position: sticky;
    top: 104px;
    padding-top: 4px;
  }

  .page-faq__idx-list {
    display: block;
    padding: 0;
    overflow: visible;
    border-left: 1px solid var(--line);
  }

  .page-faq__idx-list li {
    display: block;
    flex: none;
  }

  .page-faq__idx-list a {
    display: flex;
    align-items: baseline;
    gap: 10px;
    margin-left: -1px;
    padding: 11px 0 11px 16px;
    border: 0;
    border-left: 2px solid transparent;
    background: none;
    font-size: 15px;
    white-space: normal;
    transition: color 0.2s var(--ease), border-color 0.2s var(--ease), padding-left 0.2s var(--ease), background-color 0.2s var(--ease);
  }

  .page-faq__idx-list a:hover,
  .page-faq__idx-list a:focus-visible {
    border-left-color: var(--cyan);
    background: linear-gradient(90deg, rgba(53, 240, 224, 0.12) 0%, rgba(53, 240, 224, 0) 100%);
    padding-left: 22px;
  }

  .page-faq__index-note {
    margin-top: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}