.page-faq {
  --fq-rail-w: 208px;
  --fq-anchor-w: 168px;
  --fq-stage: 1080px;
  background: var(--paper);
  color: var(--ink);
}

.page-faq .fq-crumbs-wrap {
  padding-top: 16px;
  padding-bottom: 16px;
}

/* ── 首屏 ── */
.page-faq .fq-hero {
  position: relative;
  overflow: hidden;
  background: var(--pitch);
  color: #fff;
  padding: 44px 0 52px;
}

.page-faq .fq-hero::before {
  content: "";
  position: absolute;
  right: -140px;
  top: -120px;
  width: 460px;
  height: 460px;
  border: 1px solid rgba(0, 229, 160, 0.22);
  border-radius: 50%;
  pointer-events: none;
}

.page-faq .fq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: var(--amber);
}

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

.page-faq .fq-hero__kicker {
  margin: 0 0 14px;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-faq .fq-hero__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 30px;
  line-height: 1.24;
  letter-spacing: -0.02em;
  max-width: 22em;
}

.page-faq .fq-hero__lead {
  margin: 0 0 32px;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.76);
  max-width: 44em;
}

.page-faq .fq-branches {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-faq .fq-branch {
  display: block;
  min-height: 44px;
  padding: 16px 18px 18px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-left: 3px solid var(--cyan);
  border-radius: var(--radius);
  color: #fff;
  text-decoration: none;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .fq-branch:hover {
  transform: translateY(-2px);
  background: rgba(255, 255, 255, 0.09);
}

.page-faq .fq-branch:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-faq .fq-branch--compare { border-left-color: var(--amber); }
.page-faq .fq-branch--catalog { border-left-color: var(--magenta); }

.page-faq .fq-branch__no {
  display: block;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-faq .fq-branch__name {
  display: block;
  margin: 6px 0 6px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: -0.01em;
}

.page-faq .fq-branch__say {
  display: block;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.64);
}

/* ── 三栏主体 ── */
.page-faq .fq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  padding-top: 36px;
  padding-bottom: 64px;
}

/* 左栏：现象分类 */
.page-faq .fq-rail__title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-faq .fq-filters {
  display: flex;
  flex-wrap: nowrap;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: none;
}

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

.page-faq .fq-filters .filter-btn {
  flex: 0 0 auto;
  min-height: 44px;
  padding: 10px 14px;
  font-family: var(--font-body);
  font-size: 14px;
  text-align: left;
  color: var(--ink);
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  cursor: pointer;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .fq-filters .filter-btn:hover {
  border-color: var(--pitch);
}

.page-faq .fq-filters .filter-btn[aria-pressed="true"] {
  color: var(--cyan);
  background: var(--pitch);
  border-color: var(--pitch);
}

.page-faq .fq-filters .filter-btn:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-faq .fq-rail__note {
  display: none;
  margin: 18px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}

/* 中栏：问答流 */
.page-faq .fq-stream {
  display: grid;
  gap: 56px;
  min-width: 0;
}

.page-faq .fq-group {
  scroll-margin-top: 108px;
  min-width: 0;
}

.page-faq .fq-group__head {
  margin-bottom: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
}

.page-faq .fq-group__head::before {
  content: "";
  display: block;
  width: 44px;
  height: 3px;
  margin-bottom: 14px;
  background: var(--cyan);
}

.page-faq .fq-group[data-tags~="compare"] .fq-group__head::before { background: var(--amber); }
.page-faq .fq-group[data-tags~="catalog"] .fq-group__head::before { background: var(--indigo); }
.page-faq .fq-group[data-tags~="feedback"] .fq-group__head::before { background: var(--magenta); }
.page-faq .fq-group[data-tags~="device"] .fq-group__head::before { background: var(--wine); }

.page-faq .fq-group__no {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-faq .fq-group__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 22px;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--pitch);
}

.page-faq .fq-group__lead {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 42em;
}

.page-faq .fq-figure {
  margin: 0 0 22px;
  border: 1px solid var(--rule);
  background: var(--stack);
  overflow: hidden;
}

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

/* 问答折叠条 */
.page-faq .fq-list {
  display: grid;
  gap: 12px;
}

.page-faq .qa {
  background: var(--card);
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-faq .qa:hover {
  border-color: var(--rule);
}

.page-faq .qa[open] {
  border-color: var(--rule);
  border-left: 3px solid var(--pitch);
}

.page-faq .qa__q {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) 16px;
  align-items: start;
  gap: 10px;
  min-height: 44px;
  padding: 16px 18px;
  list-style: none;
  cursor: pointer;
}

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

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

.page-faq .qa__no {
  font-size: 12px;
  line-height: 1.9;
  color: var(--amber);
  letter-spacing: 0.06em;
}

.page-faq .qa__text {
  font-size: 16px;
  font-weight: 500;
  line-height: 1.6;
  color: var(--ink);
  overflow-wrap: anywhere;
}

.page-faq .qa__sign {
  position: relative;
  width: 14px;
  height: 14px;
  margin-top: 6px;
}

.page-faq .qa__sign::before,
.page-faq .qa__sign::after {
  content: "";
  position: absolute;
  background: var(--muted);
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .qa__sign::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.page-faq .qa__sign::after {
  left: 6px;
  top: 0;
  width: 2px;
  height: 14px;
}

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

.page-faq .qa[open] .qa__sign::before {
  background: var(--cyan);
}

.page-faq .qa__body {
  padding: 14px 18px 20px;
  border-top: 1px solid var(--rule-soft);
}

.page-faq .qa__body p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
  max-width: 62ch;
}

.page-faq .qa__steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
  counter-reset: fq-step;
}

.page-faq .qa__steps li {
  counter-increment: fq-step;
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .qa__steps li::before {
  content: counter(fq-step, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 20px;
  text-align: center;
  color: var(--amber);
  background: var(--night);
  border-radius: 2px;
}

/* 右栏：章节锚点 */
.page-faq .fq-anchor {
  display: none;
}

.page-faq .fq-anchor__title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-faq .fq-anchor__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--rule);
  display: grid;
  gap: 2px;
}

.page-faq .fq-anchor__list a {
  display: block;
  min-height: 44px;
  margin-left: -1px;
  padding: 12px 0 12px 14px;
  border-left: 2px solid transparent;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .fq-anchor__list a:hover,
.page-faq .fq-anchor__list a:focus-visible {
  color: var(--pitch);
  border-left-color: var(--cyan);
}

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

/* ── 升级处理 ── */
.page-faq .fq-escalate {
  background: var(--night);
  color: #fff;
  padding: 48px 0 56px;
}

.page-faq .fq-escalate__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-faq .fq-escalate__no {
  margin: 0 0 10px;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-faq .fq-escalate__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 24px;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.page-faq .fq-escalate__text p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.76);
  max-width: 46em;
}

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

.page-faq .fq-escalate__card {
  padding: 20px 20px 22px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-left: 3px solid var(--amber);
  border-radius: var(--radius);
}

.page-faq .fq-escalate__card-label {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--amber);
}

.page-faq .fq-escalate__row {
  margin: 0 0 12px;
  display: grid;
  gap: 4px;
}

.page-faq .fq-escalate__key {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(255, 255, 255, 0.5);
}

.page-faq .fq-escalate__val {
  font-size: 15px;
  line-height: 1.6;
  color: #fff;
  text-decoration: none;
  overflow-wrap: anywhere;
}

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

.page-faq .fq-escalate__hint {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  font-size: 13px;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.62);
}

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

/* ── 响应式 ── */
@media (min-width: 720px) {
  .page-faq .fq-hero {
    padding: 56px 0 64px;
  }

  .page-faq .fq-hero__title {
    font-size: 34px;
  }

  .page-faq .fq-branches {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

  .page-faq .fq-group__title {
    font-size: 26px;
  }
}

@media (min-width: 900px) {
  .page-faq .fq-body {
    grid-template-columns: var(--fq-rail-w) minmax(0, 1fr);
    gap: 40px;
    padding-top: 48px;
  }

  .page-faq .fq-rail {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-faq .fq-filters {
    flex-wrap: wrap;
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .fq-filters .filter-btn {
    width: 100%;
  }

  .page-faq .fq-rail__note {
    display: block;
  }

  .page-faq .fq-escalate__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }
}

@media (min-width: 1180px) {
  .page-faq .fq-body {
    grid-template-columns: var(--fq-rail-w) minmax(0, 1fr) var(--fq-anchor-w);
    gap: 44px;
  }

  .page-faq .fq-anchor {
    display: block;
    position: sticky;
    top: 104px;
    align-self: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .fq-branch,
  .page-faq .qa,
  .page-faq .qa__sign::before,
  .page-faq .qa__sign::after,
  .page-faq .fq-anchor__list a,
  .page-faq .fq-filters .filter-btn {
    transition: none;
  }
}