.page-faq {
  --faq-anchor-w: 216px;
  --faq-hair: 1px solid var(--c-grid);
  padding-bottom: clamp(48px, 8vw, 96px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  border-bottom: var(--faq-hair);
  background:
    radial-gradient(130% 100% at 84% 0%, rgba(14, 122, 115, 0.24), transparent 62%),
    repeating-linear-gradient(90deg, rgba(22, 52, 76, 0.5) 0 1px, transparent 1px 72px);
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: clamp(26px, 5vw, 56px);
  padding-block: clamp(32px, 6vw, 76px) clamp(30px, 5vw, 64px);
}

@media (min-width: 900px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.6fr);
    align-items: end;
  }
}

.page-faq .faq-hero__lede h1 {
  font-family: var(--f-serif);
  font-weight: 700;
  font-size: clamp(30px, 5vw, 52px);
  line-height: 1.22;
  letter-spacing: 0.01em;
  color: var(--c-white);
  margin: 14px 0 18px;
  max-width: 22ch;
}

.page-faq .faq-hero__lede .label {
  color: var(--c-cyan);
}

.page-faq .faq-hero__lede .prose__lede {
  color: var(--c-muted);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  max-width: 60ch;
  margin: 0 0 22px;
}

.page-faq .faq-hero__panel {
  border: var(--faq-hair);
  border-top: 2px solid var(--c-cyan);
  background: rgba(12, 32, 51, 0.8);
  padding: 18px 20px 10px;
}

.page-faq .faq-hero__panel .label {
  color: var(--c-steel);
  margin: 0;
}

.page-faq .faq-hero__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
}

.page-faq .faq-hero__item {
  border-top: var(--faq-hair);
}

.page-faq .faq-hero__item:first-child {
  border-top: 0;
}

.page-faq .faq-hero__link {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 11px 0;
  color: var(--c-muted);
  font-size: 14px;
  line-height: 1.6;
  text-decoration: none;
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-faq .faq-hero__link .mono {
  flex: none;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-steel);
}

.page-faq .faq-hero__link:hover,
.page-faq .faq-hero__link:focus-visible {
  color: var(--c-cyan);
  transform: translateX(3px);
}

/* ---------- 主栅格 ---------- */
.page-faq .faq-layout {
  display: grid;
  gap: clamp(30px, 5vw, 60px);
  padding-block: clamp(30px, 5vw, 62px) 0;
}

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

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

/* ---------- 移动端目录抽屉 ---------- */
.page-faq .faq-toc {
  border: var(--faq-hair);
  background: var(--c-panel);
  margin-bottom: 30px;
}

.page-faq .faq-toc__toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--c-white);
}

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

.page-faq .faq-toc__toggle::after {
  content: "+";
  font-family: var(--f-mono);
  font-size: 16px;
  color: var(--c-cyan);
}

.page-faq .faq-toc[open] .faq-toc__toggle::after {
  content: "\2013";
}

.page-faq .faq-toc__nav {
  display: grid;
  border-top: var(--faq-hair);
}

.page-faq .faq-toc__link {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 12px 16px;
  border-bottom: var(--faq-hair);
  color: var(--c-muted);
  font-size: 14px;
  text-decoration: none;
}

.page-faq .faq-toc__link:last-child {
  border-bottom: 0;
}

.page-faq .faq-toc__link .mono {
  flex: none;
  font-size: 11px;
  color: var(--c-cyan);
  letter-spacing: 0.14em;
}

.page-faq .faq-toc__link:hover,
.page-faq .faq-toc__link:focus-visible {
  color: var(--c-white);
}

@media (min-width: 1024px) {
  .page-faq .faq-toc {
    display: none;
  }
}

/* ---------- 桌面端锚点 ---------- */
.page-faq .faq-anchor {
  display: none;
}

@media (min-width: 1024px) {
  .page-faq .faq-anchor {
    display: block;
    position: sticky;
    top: 28px;
  }
}

.page-faq .faq-anchor__title {
  margin: 0 0 14px;
  color: var(--c-steel);
}

.page-faq .faq-anchor__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: var(--faq-hair);
}

.page-faq .faq-anchor__link {
  display: block;
  padding: 10px 0 10px 14px;
  margin-left: -1px;
  border-left: 1px solid transparent;
  color: var(--c-muted);
  font-size: 13px;
  line-height: 1.5;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-anchor__link .mono {
  display: block;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-steel);
}

.page-faq .faq-anchor__link:hover,
.page-faq .faq-anchor__link:focus-visible {
  color: var(--c-white);
  border-left-color: var(--c-cyan);
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  border-top: var(--faq-hair);
  padding-top: clamp(26px, 4vw, 42px);
  margin-bottom: clamp(38px, 7vw, 68px);
}

.page-faq .faq-group:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.page-faq .faq-group .section__head {
  margin-bottom: 20px;
}

.page-faq .faq-group .section__index {
  color: var(--c-cyan);
  font-size: 12px;
  letter-spacing: 0.18em;
  margin: 0;
}

.page-faq .faq-group .section__title {
  font-family: var(--f-serif);
  font-weight: 700;
  font-size: clamp(22px, 3.2vw, 32px);
  line-height: 1.32;
  letter-spacing: 0.01em;
  color: var(--c-white);
  margin: 10px 0 10px;
  max-width: 26ch;
}

.page-faq .faq-group .section__desc {
  margin: 0;
  color: var(--c-muted);
  font-size: 15px;
  line-height: 1.8;
  max-width: 62ch;
}

/* ---------- 步骤条 ---------- */
.page-faq .faq-steps {
  display: grid;
  gap: 10px;
  margin: 22px 0 26px;
  counter-reset: faq-step;
}

@media (min-width: 760px) {
  .page-faq .faq-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }
}

.page-faq .faq-step {
  position: relative;
  display: block;
  padding: 16px 16px 18px;
  border: var(--faq-hair);
  border-top: 2px solid var(--c-steel);
  background: rgba(12, 32, 51, 0.66);
  color: inherit;
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

@media (min-width: 760px) {
  .page-faq .faq-step + .faq-step {
    border-left: 0;
  }
}

.page-faq .faq-step:hover,
.page-faq .faq-step:focus-visible {
  border-top-color: var(--c-cyan);
  background: rgba(14, 122, 115, 0.16);
  transform: translateY(-2px);
}

.page-faq .faq-step__num {
  display: block;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--c-cyan);
}

.page-faq .faq-step__title {
  display: block;
  margin-top: 10px;
  font-size: 15px;
  font-weight: 500;
  color: var(--c-white);
  line-height: 1.5;
}

.page-faq .faq-step__note {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.68;
  color: var(--c-muted);
}

/* ---------- 图像 ---------- */
.page-faq .faq-figure {
  margin: 24px 0 30px;
  border: var(--faq-hair);
  background: var(--c-panel);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 4 / 3;
}

.page-faq .faq-figure .media-frame__caption {
  padding: 10px 14px;
  border-top: var(--faq-hair);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--c-steel);
}

/* ---------- 小标题 ---------- */
.page-faq .faq-subtitle {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 30px 0 12px;
  padding-left: 12px;
  border-left: 2px solid var(--c-teal);
  font-family: var(--f-sans);
  font-size: 15px;
  font-weight: 500;
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: var(--c-white);
}

.page-faq .faq-subhead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin: 34px 0 12px;
}

.page-faq .faq-subhead .faq-subtitle {
  margin: 0;
}

/* ---------- 弱网信号图形 ---------- */
.page-faq .faq-signal {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  height: 22px;
  flex: none;
}

.page-faq .faq-signal__bar {
  display: block;
  width: 6px;
  background: var(--c-steel);
}

.page-faq .faq-signal__bar:nth-child(1) { height: 30%; }
.page-faq .faq-signal__bar:nth-child(2) { height: 54%; }
.page-faq .faq-signal__bar:nth-child(3) { height: 78%; background: var(--c-teal); }
.page-faq .faq-signal__bar:nth-child(4) { height: 100%; background: var(--c-cyan); }

/* ---------- 问答手风琴 ---------- */
.page-faq .faq-list {
  border-top: var(--faq-hair);
}

.page-faq .faq-qa {
  border-bottom: var(--faq-hair);
  background: rgba(12, 32, 51, 0.46);
  transition: background var(--dur) var(--ease);
}

.page-faq .faq-qa[open] {
  background: var(--c-panel);
}

.page-faq .faq-q {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  line-height: 1.65;
  color: var(--c-white);
  transition: color var(--dur) var(--ease);
}

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

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

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

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

.page-faq .faq-q__idx {
  flex: none;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-steel);
}

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

.page-faq .faq-q__mark {
  position: relative;
  flex: none;
  align-self: center;
  width: 12px;
  height: 12px;
  color: var(--c-steel);
}

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

.page-faq .faq-q__mark::before,
.page-faq .faq-q__mark::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  background: currentColor;
}

.page-faq .faq-q__mark::before {
  width: 12px;
  height: 1px;
  transform: translate(-50%, -50%);
}

.page-faq .faq-q__mark::after {
  width: 1px;
  height: 12px;
  transform: translate(-50%, -50%);
  transition: transform var(--dur) var(--ease);
}

.page-faq .faq-qa[open] .faq-q__mark::after {
  transform: translate(-50%, -50%) scaleY(0);
}

.page-faq .faq-a {
  padding: 0 18px 20px 18px;
}

.page-faq .faq-a__inner {
  border-left: 2px solid var(--c-teal);
  padding-left: 14px;
}

.page-faq .faq-a__inner p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--c-muted);
}

.page-faq .faq-a__inner p + p {
  margin-top: 10px;
}

.page-faq .faq-a__inner a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(111, 242, 224, 0.4);
}

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

.page-faq .faq-term {
  color: var(--c-white);
  text-decoration: none;
  border-bottom: 1px dotted var(--c-cyan);
  cursor: help;
}

.page-faq .faq-qa[open] .faq-a {
  animation: faqReveal var(--dur) var(--ease);
}

@keyframes faqReveal {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 收尾卡片 ---------- */
.page-faq .faq-next {
  border: var(--faq-hair);
  border-top: 2px solid var(--c-cyan);
  background: rgba(12, 32, 51, 0.86);
  padding: clamp(22px, 4vw, 38px);
}

.page-faq .faq-next h2 {
  font-family: var(--f-serif);
  font-weight: 700;
  font-size: clamp(22px, 3.2vw, 30px);
  line-height: 1.35;
  letter-spacing: 0.01em;
  color: var(--c-white);
  margin: 0 0 12px;
}

.page-faq .faq-next > p {
  margin: 0 0 20px;
  color: var(--c-muted);
  font-size: 15px;
  line-height: 1.82;
  max-width: 62ch;
}

.page-faq .faq-next__list {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  gap: 10px;
}

@media (min-width: 720px) {
  .page-faq .faq-next__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px 26px;
  }
}

.page-faq .faq-next__list li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding-bottom: 10px;
  border-bottom: var(--faq-hair);
  color: var(--c-muted);
  font-size: 14px;
  line-height: 1.7;
}

.page-faq .faq-next__list .mono {
  flex: none;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-cyan);
}

.page-faq .faq-next__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.page-faq .faq-copy {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  border: 1px solid var(--c-steel);
  background: transparent;
  color: var(--c-white);
  font-family: var(--f-sans);
  font-size: 14px;
  line-height: 1.4;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

.page-faq .faq-copy__label {
  white-space: nowrap;
}

.page-faq .faq-copy .copy-btn__state {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--c-coral);
}

.page-faq .faq-copy .copy-btn__state:empty {
  display: none;
}

/* ---------- 窄屏收紧 ---------- */
@media (max-width: 620px) {
  .page-faq .faq-hero__lede h1 {
    max-width: none;
  }

  .page-faq .faq-q {
    padding: 14px 14px 13px;
    gap: 8px;
    font-size: 14.5px;
  }

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

  .page-faq .faq-a {
    padding: 0 14px 18px 14px;
  }

  .page-faq .faq-next__actions {
    gap: 10px;
  }

  .page-faq .faq-copy,
  .page-faq .faq-next__actions .btn {
    width: 100%;
    justify-content: center;
  }
}

/* ---------- 动效收敛 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-step,
  .page-faq .faq-hero__link,
  .page-faq .faq-qa,
  .page-faq .faq-q,
  .page-faq .faq-q__mark::after,
  .page-faq .faq-anchor__link,
  .page-faq .faq-copy {
    transition: none;
  }

  .page-faq .faq-step:hover,
  .page-faq .faq-step:focus-visible,
  .page-faq .faq-hero__link:hover,
  .page-faq .faq-hero__link:focus-visible {
    transform: none;
  }

  .page-faq .faq-qa[open] .faq-a {
    animation: none;
  }
}