.page-faq {
  --faq-rail: 250px;
  --faq-line: 3px;
  --faq-sky: #17304a;
  --faq-soft: #1d3550;
  background: var(--ink);
  color: var(--sand);
}

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

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background:
    radial-gradient(120% 90% at 82% 0%, rgba(196, 106, 27, 0.3), transparent 58%),
    var(--ink-deep);
  border-bottom: var(--faq-line) solid var(--faq-soft);
}

.page-faq .faq-hero__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.26;
  filter: saturate(0.75) contrast(1.05);
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: 22px;
  padding-block: 34px 42px;
}

.page-faq .breadcrumb {
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--rock);
}

.page-faq .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .breadcrumb a {
  color: var(--rock);
  text-decoration: none;
}

.page-faq .breadcrumb a:hover,
.page-faq .breadcrumb a:focus-visible {
  color: var(--amber-lift);
}

.page-faq .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--rock);
  opacity: 0.5;
}

.page-faq .faq-hero__lead {
  display: grid;
  gap: 14px;
}

.page-faq .faq-hero h1 {
  margin: 0;
  max-width: 18em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.3rem, 8.6vw, 5.6rem);
  line-height: 0.96;
  letter-spacing: -0.5px;
  color: var(--sand);
  text-wrap: balance;
}

.page-faq .faq-hero__lede {
  margin: 0;
  max-width: 54ch;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--sand-dim);
}

.page-faq .faq-hero__lede {
  color: #d9d2c5;
}

.page-faq .faq-index {
  display: grid;
  gap: 3px;
  padding: 3px;
  background: var(--faq-soft);
  box-shadow: var(--hard);
}

.page-faq .faq-index__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 10px;
  padding: 14px 16px;
  background: var(--ink-2);
  border-left: 4px solid transparent;
  color: var(--rock);
  font-size: 0.9rem;
  line-height: 1.6;
  text-decoration: none;
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-faq .faq-index__item:hover,
.page-faq .faq-index__item:focus-visible {
  background: var(--faq-sky);
  border-left-color: var(--amber);
  color: var(--sand);
}

.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--amber-lift);
}

.page-faq .faq-index__text strong {
  display: block;
  margin-bottom: 2px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: 0.02em;
  color: var(--sand);
}

/* ---------- 高频条 ---------- */

.page-faq .faq-hot {
  background: var(--amber);
  border-bottom: var(--faq-line) solid var(--edge);
}

.page-faq .faq-hot__inner {
  display: grid;
  gap: 12px;
  padding-block: 20px;
}

.page-faq .faq-hot__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.92rem;
  letter-spacing: 0.1em;
  color: #0a1420;
}

.page-faq .faq-hot__list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-hot__list a {
  display: block;
  padding: 9px 12px;
  background: rgba(10, 20, 32, 0.14);
  border-left: 4px solid #0a1420;
  color: #0a1420;
  font-size: 0.9rem;
  line-height: 1.5;
  text-decoration: none;
  transition: background 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-faq .faq-hot__list a:hover,
.page-faq .faq-hot__list a:focus-visible {
  background: rgba(10, 20, 32, 0.3);
  transform: translateX(3px);
}

/* ---------- 主体 ---------- */

.page-faq .faq-body {
  display: grid;
  gap: 34px;
  padding-block: 44px 64px;
}

.page-faq .faq-rail {
  align-self: start;
  padding: 18px 16px;
  background: var(--ink-deep);
  border: var(--faq-line) solid var(--faq-soft);
  box-shadow: var(--hard-sm);
}

.page-faq .faq-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--rock);
}

.page-faq .faq-rail__list {
  display: grid;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-rail__list a {
  display: block;
  padding: 9px 10px;
  border-left: 3px solid transparent;
  color: var(--sand-dim);
  font-size: 0.9rem;
  line-height: 1.5;
  text-decoration: none;
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-faq .faq-rail__list a:hover,
.page-faq .faq-rail__list a:focus-visible {
  background: var(--faq-sky);
  border-left-color: var(--amber);
  color: var(--sand);
}

.page-faq .faq-rail__hint {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 2px solid var(--faq-soft);
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--rock);
}

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

.page-faq .faq-group {
  padding-bottom: 38px;
  margin-bottom: 38px;
  border-bottom: var(--faq-line) solid var(--faq-soft);
  scroll-margin-top: 96px;
}

.page-faq .faq-group:last-child {
  padding-bottom: 0;
  margin-bottom: 0;
  border-bottom: 0;
}

.page-faq .faq-group__head {
  display: grid;
  gap: 10px;
  margin-bottom: 22px;
}

.page-faq .faq-group .chapter-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  color: var(--amber-lift);
}

.page-faq .faq-group h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.65rem, 4.4vw, 2.5rem);
  line-height: 1.08;
  letter-spacing: -0.4px;
  color: var(--sand);
  text-wrap: balance;
}

.page-faq .faq-group__scope {
  margin: 0;
  max-width: 58ch;
  font-size: 0.94rem;
  line-height: 1.72;
  color: var(--rock);
}

/* ---------- 手风琴 ---------- */

.page-faq .faq-item {
  margin-bottom: 12px;
  background: var(--ink-2);
  border: var(--faq-line) solid var(--faq-soft);
  border-left: 6px solid var(--faq-soft);
  scroll-margin-top: 96px;
  transition: border-color 0.2s var(--ease);
}

.page-faq .faq-item:last-of-type {
  margin-bottom: 0;
}

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

.page-faq .faq-item > summary {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 15px 18px;
  background: var(--ink-2);
  color: var(--sand);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.06rem;
  line-height: 1.45;
  cursor: pointer;
  list-style: none;
  transition: color 0.2s var(--ease);
}

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

.page-faq .faq-item > summary:hover {
  color: var(--amber-lift);
}

.page-faq .faq-item > summary:focus-visible {
  outline: 3px solid var(--amber-lift);
  outline-offset: -3px;
}

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

.page-faq .faq-item .tag {
  flex: none;
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.page-faq .faq-item__mark {
  flex: none;
  width: 11px;
  height: 11px;
  margin-top: 7px;
  border-right: 3px solid var(--amber-lift);
  border-bottom: 3px solid var(--amber-lift);
  transform: rotate(45deg);
  transition: transform 0.22s var(--ease);
}

.page-faq .faq-item[open] .faq-item__mark {
  transform: rotate(225deg);
}

.page-faq .faq-item__body {
  padding: 4px 20px 22px;
  background: var(--ink-deep);
  border-top: var(--faq-line) solid var(--faq-soft);
  color: var(--sand-dim);
  font-size: 0.95rem;
  line-height: 1.78;
}

.page-faq .faq-item__body a {
  color: var(--amber-lift);
  text-decoration: none;
  border-bottom: 2px solid currentColor;
}

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

.page-faq .faq-steps {
  display: grid;
  gap: 10px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.page-faq .faq-steps > li {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  counter-increment: step;
}

.page-faq .faq-steps > li::before {
  content: counter(step);
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  background: var(--ink-2);
  border: 2px solid var(--oasis);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  line-height: 1;
}

.page-faq .faq-why {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 2px solid var(--faq-soft);
  font-size: 0.89rem;
  line-height: 1.72;
  color: var(--rock);
}

/* ---------- 客户端信号图 ---------- */

.page-faq .faq-signal {
  margin: 18px 0 0;
  padding: 14px 16px;
  background: var(--ink-2);
  border: var(--faq-line) solid var(--faq-soft);
}

.page-faq .faq-signal svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-faq .faq-signal__track {
  fill: var(--faq-soft);
}

.page-faq .faq-signal__good {
  fill: var(--oasis);
}

.page-faq .faq-signal__weak {
  fill: var(--amber);
}

.page-faq .faq-signal figcaption {
  margin-top: 10px;
  font-size: 0.82rem;
  line-height: 1.65;
  color: var(--rock);
}

/* ---------- 客户端配图 ---------- */

.page-faq .faq-figure {
  max-width: 100%;
  margin: 22px 0 0;
  background: var(--ink-deep);
  border: var(--faq-line) solid var(--faq-soft);
}

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

.page-faq .faq-figure figcaption {
  padding: 12px 14px;
  border-top: var(--faq-line) solid var(--faq-soft);
  font-size: 0.82rem;
  line-height: 1.65;
  color: var(--rock);
}

/* ---------- 联系 ---------- */

.page-faq .faq-help {
  padding-block: 46px 62px;
  background: var(--ink-2);
  border-top: var(--faq-line) solid var(--edge);
}

.page-faq .faq-help__inner {
  display: grid;
  gap: 24px;
}

.page-faq .faq-help__lead {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-faq .faq-help h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.6rem, 3.8vw, 2.35rem);
  line-height: 1.12;
  color: var(--sand);
  text-wrap: balance;
}

.page-faq .faq-help__note {
  margin: 0;
  max-width: 52ch;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--rock);
}

.page-faq .faq-help__note a {
  color: var(--amber-lift);
  text-decoration: none;
  border-bottom: 2px solid currentColor;
}

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

.page-faq .faq-help__list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-help__item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  background: var(--ink);
  border: 2px solid rgba(147, 166, 184, 0.28);
  border-left: 6px solid var(--amber);
}

.page-faq .faq-help__key {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--rock);
}

.page-faq .faq-help__val {
  flex: 1 1 auto;
  min-width: 0;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--sand);
  overflow-wrap: anywhere;
}

.page-faq .faq-help__val--text {
  font-family: var(--font-body);
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--sand-dim);
}

.page-faq .copy-btn {
  flex: none;
  padding: 5px 11px;
  background: transparent;
  border: 2px solid var(--amber);
  color: var(--amber-lift);
  font-family: var(--font-body);
  font-size: 0.78rem;
  line-height: 1.4;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .copy-btn:hover,
.page-faq .copy-btn:focus-visible {
  background: var(--amber);
  color: var(--ink-deep);
}

.page-faq .copy-btn[data-copied] {
  background: var(--oasis);
  border-color: var(--oasis);
  color: var(--ink-deep);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-faq .faq-rail__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.42fr) minmax(320px, 1fr);
    column-gap: 56px;
    row-gap: 28px;
    align-items: end;
    padding-block: 40px 52px;
  }

  .page-faq .faq-hero .breadcrumb {
    grid-column: 1 / -1;
  }

  .page-faq .faq-hero__lead {
    grid-column: 1;
  }

  .page-faq .faq-index {
    grid-column: 2;
  }

  .page-faq .faq-hot__inner {
    grid-template-columns: 190px minmax(0, 1fr);
    align-items: center;
    column-gap: 32px;
  }

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

  .page-faq .faq-help__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    column-gap: 60px;
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    column-gap: 56px;
    padding-block: 52px 76px;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 24px;
  }

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

  .page-faq .faq-item > summary {
    padding: 16px 20px;
    font-size: 1.1rem;
  }

  .page-faq .faq-figure {
    max-width: 420px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index__item,
  .page-faq .faq-hot__list a,
  .page-faq .faq-rail__list a,
  .page-faq .faq-item,
  .page-faq .faq-item__mark,
  .page-faq .copy-btn {
    transition: none;
  }

  .page-faq .faq-hot__list a:hover,
  .page-faq .faq-hot__list a:focus-visible {
    transform: none;
  }
}