.page-faq {
  --faq-y: clamp(28px, 5vw, 52px);
  --faq-hair-dark: rgba(44, 65, 96, 0.72);
  --faq-hair-light: rgba(16, 24, 32, 0.14);
}

.page-faq a:focus-visible,
.page-faq button:focus-visible,
.page-faq summary:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 3px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  color: var(--paper-100);
  background:
    radial-gradient(120% 140% at 88% 0%, rgba(79, 227, 208, 0.10) 0%, rgba(11, 21, 38, 0) 58%),
    var(--ink-900);
  padding: clamp(22px, 4vw, 34px) 0 clamp(36px, 6vw, 68px);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: repeating-linear-gradient(90deg, var(--red-500) 0 26px, transparent 26px 52px);
  opacity: 0.5;
}

.page-faq .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5em;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: rgba(244, 241, 236, 0.6);
}

.page-faq .breadcrumbs a {
  color: rgba(244, 241, 236, 0.82);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-faq .breadcrumbs a:hover {
  border-bottom-color: var(--red-500);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(18px, 3.5vw, 32px);
}

.page-faq .faq-hero .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan-400);
}

.page-faq .faq-hero .h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.02;
  font-size: clamp(34px, 6.4vw, 64px);
  color: #ffffff;
}

.page-faq .faq-hero .lede {
  margin: 16px 0 0;
  max-width: 34em;
  font-size: var(--fs-17);
  line-height: 1.75;
  color: rgba(244, 241, 236, 0.78);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-faq .faq-hero__actions .btn {
  text-decoration: none;
}

.page-faq .faq-hero__board {
  position: relative;
  border: 1px solid var(--faq-hair-dark);
  background: linear-gradient(160deg, rgba(22, 38, 63, 0.96), rgba(11, 21, 38, 0.98));
  padding: clamp(20px, 3vw, 28px) clamp(18px, 3vw, 24px);
}

.page-faq .faq-hero__board::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 8px;
  background: repeating-linear-gradient(90deg, var(--ink-500) 0 1px, transparent 1px 14px);
  opacity: 0.85;
}

.page-faq .faq-board__label {
  margin: 0;
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: rgba(244, 241, 236, 0.56);
}

.page-faq .faq-board__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px 14px;
}

.page-faq .faq-board__list li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 12px;
  border-top: 1px solid var(--faq-hair-dark);
}

.page-faq .faq-board__list .data--xl {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 6vw, 44px);
  line-height: 1;
  color: var(--cyan-400);
}

.page-faq .faq-board__cap {
  font-size: var(--fs-12);
  line-height: 1.5;
  color: rgba(244, 241, 236, 0.68);
}

/* ---------- 主区与侧栏 ---------- */
.page-faq .faq-layout {
  padding-top: var(--faq-y);
  padding-bottom: var(--faq-y);
}

.page-faq .faq-main > section + section {
  margin-top: clamp(34px, 5vw, 58px);
}

.page-faq .faq-sec-head {
  display: grid;
  gap: 6px;
  padding-top: 14px;
  margin-bottom: 18px;
  border-top: 1px solid var(--faq-hair-light);
}

.page-faq .faq-sec-head .h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.01em;
  font-size: clamp(24px, 3.6vw, 32px);
  color: var(--ink-900);
}

.page-faq .faq-sec-head .muted {
  margin: 0;
  max-width: 40em;
  font-size: var(--fs-15);
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 分类书脊标签 ---------- */
.page-faq .faq-spines {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 0 0 8px;
  scrollbar-width: thin;
}

.page-faq .faq-spine {
  flex: 0 0 auto;
  appearance: none;
  padding: 12px 16px;
  border: 1px solid var(--faq-hair-light);
  border-left: 4px solid transparent;
  background: var(--paper-200);
  color: var(--ink-900);
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: var(--fs-15);
  letter-spacing: 0.02em;
  cursor: pointer;
  border-radius: 2px;
  transition: background 180ms var(--ease), border-color 180ms var(--ease), color 180ms var(--ease);
}

.page-faq .faq-spine:hover {
  background: #ffffff;
}

.page-faq .faq-spine[aria-selected="true"] {
  background: #ffffff;
  border-left-color: var(--red-500);
  color: var(--ink-900);
  box-shadow: inset 0 -2px 0 rgba(225, 43, 50, 0.16);
}

.page-faq .faq-tabpanel {
  margin-top: 6px;
  padding: 16px 0 0;
  border-top: 1px solid var(--faq-hair-light);
}

.page-faq .faq-tabpanel[hidden] {
  display: none;
}

.page-faq .faq-tabpanel p {
  margin: 0;
  max-width: 34em;
  font-size: var(--fs-15);
  line-height: 1.75;
  color: rgba(16, 24, 32, 0.82);
}

.page-faq .faq-jump {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  color: var(--red-500);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
}

.page-faq .faq-jump:hover {
  color: var(--red-700);
}

/* ---------- 问答条目 ---------- */
.page-faq .faq-group + .faq-group {
  margin-top: clamp(24px, 4vw, 38px);
}

.page-faq .faq-group__title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-21);
  letter-spacing: 0.01em;
  color: var(--ink-900);
}

.page-faq .faq-group__index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border: 1px solid var(--red-500);
  color: var(--red-500);
  font-family: var(--font-serif);
  font-size: var(--fs-13);
  line-height: 1;
}

.page-faq .faq-group__count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--muted);
}

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

.page-faq .faq-item {
  border-bottom: 1px solid var(--faq-hair-light);
}

.page-faq .faq-item summary {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 34px 15px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-item summary::after {
  content: "+";
  position: absolute;
  right: 6px;
  top: 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-17);
  line-height: 1;
  color: var(--red-500);
}

.page-faq .faq-item details[open] > summary::after {
  content: "–";
  color: var(--red-700);
}

.page-faq .faq-num {
  flex: 0 0 auto;
  min-width: 1.9em;
  font-family: var(--font-serif);
  font-size: var(--fs-21);
  line-height: 1.1;
  color: var(--ink-500);
}

.page-faq .faq-item details[open] .faq-num {
  color: var(--red-500);
}

.page-faq .faq-q {
  font-size: var(--fs-17);
  font-weight: 500;
  line-height: 1.55;
  color: var(--ink-text);
}

.page-faq .faq-item details[open] .faq-q {
  color: var(--ink-900);
}

.page-faq .faq-a {
  padding: 0 0 18px calc(1.9em + 12px);
}

.page-faq .faq-a p {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--fs-15);
  line-height: 1.8;
  color: rgba(16, 24, 32, 0.82);
}

.page-faq .faq-a a {
  color: var(--red-500);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-a a:hover {
  color: var(--red-700);
}

/* ---------- 设备记录 ---------- */
.page-faq .faq-records {
  padding: clamp(22px, 4vw, 40px);
  border-left: 3px solid var(--red-500);
  background: var(--ink-900);
  color: var(--paper-100);
}

.page-faq .faq-records .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan-400);
}

.page-faq .faq-records .h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.01em;
  font-size: clamp(24px, 3.8vw, 34px);
  color: #ffffff;
}

.page-faq .faq-records .lede {
  margin: 14px 0 0;
  max-width: 36em;
  font-size: var(--fs-17);
  line-height: 1.78;
  color: rgba(244, 241, 236, 0.8);
}

.page-faq .faq-records__figure {
  margin: clamp(18px, 3vw, 26px) 0;
}

.page-faq .faq-records__figure .figure__frame {
  border: 1px solid var(--faq-hair-dark);
  background-color: var(--ink-700);
}

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

.page-faq .faq-records__figure .figure__caption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: rgba(244, 241, 236, 0.6);
}

.page-faq .faq-records__points {
  display: grid;
  gap: 16px;
}

.page-faq .faq-point {
  padding-top: 10px;
  border-top: 1px solid var(--faq-hair-dark);
}

.page-faq .faq-point h3 {
  margin: 0 0 6px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: var(--fs-15);
  color: var(--cyan-400);
}

.page-faq .faq-point p {
  margin: 0;
  font-size: var(--fs-13);
  line-height: 1.8;
  color: rgba(244, 241, 236, 0.78);
}

/* ---------- 区间战绩 ---------- */
.page-faq .faq-range__stats {
  display: grid;
  gap: 12px;
}

.page-faq .faq-stat {
  padding: 16px 18px 18px;
  border-top: 2px solid var(--red-500);
  background: #ffffff;
  box-shadow: 0 1px 0 var(--faq-hair-light);
}

.page-faq .faq-stat .data--xl {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(32px, 5.4vw, 48px);
  line-height: 1;
  color: var(--ink-900);
}

.page-faq .faq-stat__unit {
  margin-left: 4px;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  color: var(--muted);
}

.page-faq .faq-stat__label {
  display: block;
  margin-top: 8px;
  font-size: var(--fs-13);
  line-height: 1.5;
  color: var(--muted);
}

.page-faq .faq-range__list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-faq .faq-range__list li {
  position: relative;
  padding-left: 22px;
  font-size: var(--fs-15);
  line-height: 1.8;
  color: rgba(16, 24, 32, 0.82);
}

.page-faq .faq-range__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 10px;
  height: 2px;
  background: var(--red-500);
}

/* ---------- 账号同步 ---------- */
.page-faq .faq-sync__grid {
  display: grid;
  gap: 14px;
}

.page-faq .faq-sync__card {
  padding: 16px 18px;
  border: 1px solid var(--faq-hair-light);
  background: var(--paper-100);
  box-shadow: 0 1px 0 rgba(16, 24, 32, 0.05);
}

.page-faq .faq-sync__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: var(--fs-17);
  color: var(--ink-900);
}

.page-faq .faq-sync__card p {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.78;
  color: rgba(16, 24, 32, 0.8);
}

.page-faq .faq-sync__note {
  margin: 16px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--cyan-deep);
  font-size: var(--fs-15);
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 侧栏 ---------- */
.page-faq .faq-aside {
  margin-top: clamp(32px, 5vw, 48px);
  padding-top: 14px;
  border-top: 2px solid var(--ink-900);
}

.page-faq .faq-aside__title {
  margin: 0 0 12px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: var(--fs-17);
  letter-spacing: 0.02em;
  color: var(--ink-900);
}

.page-faq .faq-aside__terms {
  margin: 0;
  display: grid;
}

.page-faq .faq-aside__terms > div {
  padding: 9px 0;
  border-bottom: 1px solid var(--faq-hair-light);
}

.page-faq .faq-aside__terms dt {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  color: var(--ink-700);
  border-bottom: 1px dotted var(--cyan-deep);
}

.page-faq .faq-aside__terms dd {
  margin: 4px 0 0;
  font-size: var(--fs-13);
  line-height: 1.65;
  color: var(--muted);
}

.page-faq .faq-aside__link {
  display: inline-block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  color: var(--red-500);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.page-faq .faq-aside__link:hover {
  color: var(--red-700);
}

.page-faq .faq-aside__note {
  margin-top: 18px;
  padding: 14px 16px;
  background: var(--ink-900);
  color: var(--paper-100);
}

.page-faq .faq-aside__note p {
  margin: 0 0 6px;
  font-size: var(--fs-13);
  color: rgba(244, 241, 236, 0.72);
}

.page-faq .faq-aside__note a {
  display: inline-flex;
  gap: 6px;
  font-size: var(--fs-15);
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

/* ---------- 术语索引 ---------- */
.page-faq .faq-gloss {
  padding: clamp(32px, 6vw, 64px) 0;
  background:
    linear-gradient(180deg, rgba(22, 38, 63, 0.9) 0%, rgba(11, 21, 38, 1) 55%),
    var(--ink-900);
  color: var(--paper-100);
}

.page-faq .faq-gloss__head {
  padding-top: 14px;
  border-top: 1px solid var(--faq-hair-dark);
}

.page-faq .faq-gloss__head .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan-400);
}

.page-faq .faq-gloss__head .h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.01em;
  font-size: clamp(24px, 4vw, 36px);
  color: #ffffff;
}

.page-faq .faq-gloss__head .lede {
  margin: 12px 0 0;
  max-width: 38em;
  font-size: var(--fs-15);
  line-height: 1.8;
  color: rgba(244, 241, 236, 0.76);
}

.page-faq .faq-gloss__head .lede a {
  color: var(--cyan-400);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-gloss__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(20px, 3.5vw, 32px);
}

.page-faq .faq-terms {
  margin: 0;
  display: grid;
}

.page-faq .faq-term {
  padding: 12px 0;
  border-bottom: 1px solid var(--faq-hair-dark);
}

.page-faq .faq-term dt {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.03em;
  color: var(--cyan-400);
  border-bottom: 1px dotted rgba(79, 227, 208, 0.62);
}

.page-faq .faq-term dd {
  margin: 6px 0 0;
  font-size: var(--fs-15);
  line-height: 1.75;
  color: rgba(244, 241, 236, 0.8);
}

.page-faq .faq-term dd a {
  color: var(--paper-100);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--red-500);
}

.page-faq .faq-gloss__figure {
  margin: 0;
}

.page-faq .faq-gloss__figure .figure__frame {
  border: 1px solid var(--faq-hair-dark);
  background-color: var(--ink-700);
}

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

.page-faq .faq-gloss__figure .figure__caption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: rgba(244, 241, 236, 0.58);
}

/* ---------- 仍未解决 ---------- */
.page-faq .faq-help {
  padding: clamp(32px, 6vw, 64px) 0;
  background: var(--paper-100);
  border-top: 1px solid var(--faq-hair-light);
}

.page-faq .faq-help__inner {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-faq .faq-help__lead .h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.01em;
  font-size: clamp(26px, 4vw, 40px);
  color: var(--ink-900);
}

.page-faq .faq-help__lead .measure {
  margin: 14px 0 0;
  font-size: var(--fs-17);
  line-height: 1.78;
  color: rgba(16, 24, 32, 0.82);
}

.page-faq .faq-help__lead .btn {
  margin-top: 20px;
  text-decoration: none;
}

.page-faq .faq-help__mail {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  line-height: 1.7;
  color: var(--ink-700);
  word-break: break-word;
}

.page-faq .faq-help__tips {
  padding-left: 18px;
  border-left: 3px solid var(--red-500);
}

.page-faq .faq-help__tips .h3 {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: var(--fs-17);
  color: var(--ink-900);
}

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

.page-faq .faq-help__list li {
  display: flex;
  gap: 10px;
  align-items: baseline;
  font-size: var(--fs-15);
  line-height: 1.7;
  color: rgba(16, 24, 32, 0.82);
}

.page-faq .faq-help__no {
  flex: 0 0 auto;
  font-size: var(--fs-12);
  color: var(--red-500);
}

.page-faq .faq-help__note {
  margin: 16px 0 0;
  font-size: var(--fs-13);
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-faq .faq-range__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-records__points {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(16px, 2.5vw, 28px);
  }

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

  .page-faq .faq-terms {
    grid-template-columns: 1fr 1fr;
    column-gap: clamp(20px, 3vw, 40px);
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-faq .faq-help__inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 264px;
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

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

  .page-faq .faq-aside {
    position: sticky;
    top: 92px;
    margin-top: 0;
  }

  .page-faq .faq-gloss__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-spine {
    transition: none;
  }
}