.page-faq {
  --faq-line: rgba(201, 211, 223, 0.14);
  --faq-line-strong: rgba(201, 211, 223, 0.3);
  background: var(--abyss-950);
  color: var(--silver-200);
  padding-bottom: 72px;
}

.page-faq .faq-crumb {
  padding-top: 18px;
}

/* ---------- 首屏封面 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: 26px 0 46px;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -180px;
  right: -140px;
  width: 520px;
  height: 520px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(78, 168, 222, 0.22), rgba(7, 13, 24, 0) 66%);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, rgba(42, 58, 82, 0), var(--steel-600) 45%, rgba(42, 58, 82, 0));
}

.page-faq .faq-hero__grid {
  position: relative;
  display: grid;
  gap: 30px;
  align-items: center;
}

.page-faq .faq-hero .kicker {
  margin: 0 0 16px;
}

.page-faq .faq-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 8vw, 82px);
  line-height: 0.98;
  letter-spacing: -0.04em;
  color: var(--silver-050);
}

.page-faq .faq-hero__lede {
  margin: 0 0 24px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--silver-200);
}

.page-faq .faq-hero__jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

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

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 24px;
  border: 1px solid var(--faq-line);
  filter: saturate(0.92) contrast(1.05);
}

.page-faq .faq-hero__media .mono-note {
  display: block;
  margin-top: 10px;
}

@media (min-width: 720px) {
  .page-faq .faq-hero__lede {
    font-size: 17px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    padding: 40px 0 60px;
  }
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 52px;
  }
}

/* ---------- 主体两栏：左侧分类轨道 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: 26px;
  padding-top: 10px;
}

.page-faq .faq-rail {
  padding: 14px 0;
  border-top: 1px solid var(--faq-line);
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--muted-500);
}

.page-faq .faq-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 2px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-rail__list li {
  flex: 0 0 auto;
}

.page-faq .faq-rail__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--faq-line);
  border-radius: var(--radius-pill);
  color: var(--silver-200);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease), background 0.24s var(--ease);
}

.page-faq .faq-rail__list a:hover,
.page-faq .faq-rail__list a:focus-visible {
  color: var(--silver-050);
  border-color: var(--benz-blue-500);
  background: rgba(78, 168, 222, 0.1);
}

.page-faq .faq-rail__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--benz-blue-500);
}

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

@media (min-width: 900px) {
  .page-faq .faq-body {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 44px;
    padding-top: 26px;
    align-items: start;
  }
  .page-faq .faq-rail {
    position: sticky;
    top: 28px;
    border-top: 0;
    border-bottom: 0;
    padding: 0;
  }
  .page-faq .faq-rail__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }
  .page-faq .faq-rail__list a {
    border-radius: 10px;
    border-color: transparent;
    border-left: 2px solid transparent;
    padding: 9px 12px;
    white-space: normal;
  }
  .page-faq .faq-rail__list a:hover,
  .page-faq .faq-rail__list a:focus-visible {
    border-left-color: var(--benz-blue-500);
    background: rgba(78, 168, 222, 0.08);
  }
  .page-faq .faq-rail__tip {
    display: block;
    margin: 18px 0 0;
    padding: 14px 0 0;
    border-top: 1px solid var(--faq-line);
    font-size: 12px;
    line-height: 1.7;
    color: var(--muted-500);
  }
}

/* ---------- 章节外壳 ---------- */
.page-faq .faq-section {
  padding: 34px 0 8px;
  border-top: 1px solid var(--faq-line);
}

.page-faq .faq-main > .faq-section:first-child {
  border-top: 0;
  padding-top: 4px;
}

.page-faq .faq-section__head {
  display: grid;
  gap: 8px;
  margin-bottom: 24px;
}

.page-faq .faq-no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--benz-blue-500);
}

.page-faq .faq-section__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 4.4vw, 36px);
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--silver-050);
}

.page-faq .faq-section__lede {
  margin: 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--silver-200);
}

@media (min-width: 760px) {
  .page-faq .faq-section__head {
    grid-template-columns: 62px minmax(0, 1fr);
    column-gap: 18px;
    row-gap: 10px;
    align-items: start;
  }
  .page-faq .faq-no {
    grid-column: 1;
    grid-row: 1 / span 2;
    padding-top: 8px;
  }
  .page-faq .faq-section__title {
    grid-column: 2;
    grid-row: 1;
  }
  .page-faq .faq-section__lede {
    grid-column: 2;
    grid-row: 2;
  }
}

/* ---------- 01 帮助分类 ---------- */
.page-faq .cat-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .cat-item {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  grid-template-rows: auto auto auto;
  column-gap: 14px;
  row-gap: 6px;
  padding: 18px 18px 16px;
  background: linear-gradient(160deg, rgba(22, 35, 58, 0.92), rgba(12, 22, 38, 0.92));
  border: 1px solid var(--faq-line);
  border-left: 2px solid var(--steel-600);
  border-radius: 18px;
  transition: transform 0.26s var(--ease), border-color 0.26s var(--ease);
}

.page-faq .cat-item:hover {
  transform: translateY(-2px);
  border-color: var(--faq-line-strong);
  border-left-color: var(--benz-blue-500);
}

.page-faq .cat-item__no {
  grid-column: 1;
  grid-row: 1 / span 2;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--benz-blue-500);
}

.page-faq .cat-item__title {
  grid-column: 2;
  grid-row: 1;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--silver-050);
}

.page-faq .cat-item__text {
  grid-column: 2;
  grid-row: 2;
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted-500);
}

.page-faq .cat-item__tag {
  grid-column: 2;
  grid-row: 3;
  justify-self: start;
  margin-top: 4px;
}

@media (min-width: 780px) {
  .page-faq .cat-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
}

/* ---------- 02 卡关攻略 ---------- */
.page-faq .faq-walk__figure {
  margin: 0 0 22px;
}

.page-faq .faq-walk__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: 20px;
  border: 1px solid var(--faq-line);
}

.page-faq .faq-walk__figure .mono-note {
  display: block;
  margin-top: 10px;
}

.page-faq .diff-panel__label {
  margin: 0 0 10px;
}

.page-faq .diff-tabs,
.page-faq .q-tabs {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.page-faq .diff-tabs input,
.page-faq .q-tabs input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-faq .diff-tabs label,
.page-faq .q-tabs label {
  cursor: pointer;
  padding: 7px 15px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--faq-line);
  font-size: 13px;
  color: var(--silver-200);
  transition: background 0.22s var(--ease), border-color 0.22s var(--ease), color 0.22s var(--ease);
}

.page-faq .diff-tabs label:hover,
.page-faq .q-tabs label:hover {
  border-color: var(--faq-line-strong);
}

.page-faq .diff-tabs input:focus-visible + label,
.page-faq .q-tabs input:focus-visible + label {
  outline: 2px solid var(--cyan-glow-400);
  outline-offset: 2px;
}

.page-faq .diff-tabs input:checked + label {
  background: var(--benz-blue-500);
  border-color: var(--benz-blue-500);
  color: #04121f;
  font-weight: 700;
}

.page-faq .q-tabs input:checked + label {
  background: var(--bmw-orange-500);
  border-color: var(--bmw-orange-500);
  color: #1b0f04;
  font-weight: 700;
}

.page-faq .diff-panel:has(#diff-easy:checked) .stage:not([data-diff="easy"]),
.page-faq .diff-panel:has(#diff-mid:checked) .stage:not([data-diff="mid"]),
.page-faq .diff-panel:has(#diff-hard:checked) .stage:not([data-diff="hard"]) {
  display: none;
}

.page-faq .stage-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-faq .stage {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 14px 14px;
  border-radius: 16px;
  border: 1px solid var(--faq-line);
  background: var(--graphite-800);
  transition: border-color 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-faq .stage::before {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  top: 0;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--benz-blue-500), rgba(78, 168, 222, 0));
}

.page-faq .stage[data-diff="hard"]::before {
  background: linear-gradient(90deg, var(--bmw-orange-500), rgba(240, 138, 60, 0));
}

.page-faq .stage:hover {
  transform: translateY(-2px);
  border-color: var(--faq-line-strong);
}

.page-faq .stage__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted-500);
}

.page-faq .stage__name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--silver-050);
}

.page-faq .stage__desc {
  margin: 0 0 6px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted-500);
}

.page-faq .stage .pill {
  align-self: flex-start;
  margin-top: auto;
}

@media (min-width: 640px) {
  .page-faq .stage-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-faq .stage-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 03 配置与设备 ---------- */
.page-faq .spec-grid {
  border: 1px solid var(--faq-line);
  border-radius: 20px;
  overflow: hidden;
  background: rgba(12, 22, 38, 0.6);
}

.page-faq .spec-row {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 4px 16px;
  padding: 13px 16px;
  border-bottom: 1px solid var(--faq-line);
}

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

.page-faq .spec-row__label {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted-500);
}

.page-faq .spec-row__value {
  font-size: 15px;
  line-height: 1.6;
  color: var(--silver-050);
}

@media (min-width: 720px) {
  .page-faq .spec-row {
    grid-template-columns: 130px minmax(0, 1fr);
    padding: 14px 20px;
  }
}

.page-faq .faq-sub {
  margin: 26px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--silver-050);
}

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

.page-faq .trouble li {
  counter-increment: faqstep;
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 10px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--silver-200);
}

.page-faq .trouble li::before {
  content: counter(faqstep, decimal-leading-zero);
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--cyan-glow-400);
}

/* ---------- 04 会员中心 ---------- */
.page-faq .member-grid {
  display: grid;
  gap: 18px;
}

.page-faq .member-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq .member-item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  column-gap: 12px;
  row-gap: 4px;
  padding: 15px 0;
  border-bottom: 1px dashed var(--faq-line);
}

.page-faq .member-item:first-child {
  border-top: 1px dashed var(--faq-line);
}

.page-faq .member-item__no {
  grid-row: 1 / span 2;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--benz-blue-500);
}

.page-faq .member-item h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--silver-050);
}

.page-faq .member-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted-500);
}

.page-faq .member-sync {
  padding: 22px 20px;
  border-radius: 22px;
  border: 1px solid rgba(63, 224, 196, 0.25);
  background:
    radial-gradient(120% 100% at 100% 0%, rgba(63, 224, 196, 0.14), rgba(12, 22, 38, 0) 62%),
    var(--ink-900);
}

.page-faq .member-sync h3 {
  margin: 8px 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -0.01em;
  color: var(--silver-050);
}

.page-faq .member-sync p {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--silver-200);
}

.page-faq .member-sync a {
  font-size: 14px;
  color: var(--cyan-glow-400);
}

@media (min-width: 880px) {
  .page-faq .member-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.85fr);
    gap: 28px;
    align-items: start;
  }
}

/* ---------- 05 测试版通道 ---------- */
.page-faq .chan-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .chan-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 18px 18px;
  border-radius: 20px;
  border: 1px solid var(--faq-line);
  background: linear-gradient(170deg, rgba(22, 35, 58, 0.85), rgba(12, 22, 38, 0.9));
  transition: border-color 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-faq .chan-item:hover {
  transform: translateY(-2px);
  border-color: var(--faq-line-strong);
}

.page-faq .chan-item--lead {
  border-color: rgba(78, 168, 222, 0.45);
  box-shadow: inset 0 0 0 1px rgba(78, 168, 222, 0.12);
}

.page-faq .chan-item h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  color: var(--silver-050);
}

.page-faq .chan-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted-500);
}

.page-faq .chan-item .pill {
  align-self: flex-start;
  margin-top: auto;
}

.page-faq .chan-item__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--bmw-orange-500);
}

.page-faq .chan-item--lead .chan-item__dot {
  background: var(--benz-blue-500);
  box-shadow: 0 0 12px rgba(78, 168, 222, 0.8);
}

.page-faq .chan-links {
  margin-top: 18px;
  display: grid;
  gap: 8px;
}

.page-faq .chan-links p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--silver-200);
}

.page-faq .chan-links a {
  color: var(--benz-blue-500);
}

@media (min-width: 780px) {
  .page-faq .chan-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 06 联系与响应 ---------- */
.page-faq .contact-grid {
  display: grid;
  gap: 18px;
}

.page-faq .contact-note p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--silver-200);
}

.page-faq .contact-note .btn {
  margin-top: 4px;
}

.page-faq .contact-card {
  padding: 6px 20px;
  border-radius: 22px;
  border: 1px solid var(--faq-line);
  background: var(--ink-900);
}

.page-faq .contact-row {
  display: grid;
  gap: 3px;
  padding: 14px 0;
  border-bottom: 1px dashed var(--faq-line);
}

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

.page-faq .contact-row__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted-500);
}

.page-faq .contact-row__value {
  font-size: 15px;
  line-height: 1.6;
  color: var(--silver-050);
  word-break: break-word;
}

@media (min-width: 820px) {
  .page-faq .contact-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 32px;
    align-items: start;
  }
}

/* ---------- 07 热门问题 ---------- */
.page-faq .q-panel:has(#qcat-start:checked) .faq-q:not([data-topic="start"]),
.page-faq .q-panel:has(#qcat-walk:checked) .faq-q:not([data-topic="walk"]),
.page-faq .q-panel:has(#qcat-device:checked) .faq-q:not([data-topic="device"]):not([data-topic="account"]),
.page-faq .q-panel:has(#qcat-chan:checked) .faq-q:not([data-topic="chan"]),
.page-faq .q-panel:has(#qcat-help:checked) .faq-q:not([data-topic="help"]) {
  display: none;
}

.page-faq .faq-list {
  display: grid;
  gap: 10px;
}

.page-faq .faq-q {
  border: 1px solid var(--faq-line);
  border-left: 2px solid var(--steel-600);
  border-radius: 14px;
  background: rgba(12, 22, 38, 0.62);
  transition: border-color 0.24s var(--ease), background 0.24s var(--ease);
}

.page-faq .faq-q[open] {
  border-left-color: var(--cyan-glow-400);
  background: rgba(22, 35, 58, 0.75);
}

.page-faq .faq-q__summary {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr) 20px;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

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

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

.page-faq .faq-q__summary::after {
  content: "+";
  text-align: center;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--muted-500);
  transition: color 0.2s var(--ease);
}

.page-faq .faq-q[open] .faq-q__summary::after {
  content: "−";
  color: var(--cyan-glow-400);
}

.page-faq .faq-q__summary:hover .faq-q__text {
  color: var(--benz-blue-500);
}

.page-faq .faq-q__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--bmw-orange-500);
}

.page-faq .faq-q__text {
  font-size: 15px;
  line-height: 1.5;
  color: var(--silver-050);
  transition: color 0.2s var(--ease);
}

.page-faq .faq-q__body {
  padding: 0 16px 16px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--silver-200);
}

.page-faq .faq-q__body p {
  margin: 0;
}

@media (min-width: 760px) {
  .page-faq .faq-q__body {
    padding: 0 20px 18px 72px;
  }
}

/* ---------- 动效收敛 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .cat-item,
  .page-faq .stage,
  .page-faq .chan-item,
  .page-faq .faq-q,
  .page-faq .faq-q__summary::after,
  .page-faq .faq-q__text,
  .page-faq .faq-rail__list a {
    transition: none;
  }
  .page-faq .cat-item:hover,
  .page-faq .stage:hover,
  .page-faq .chan-item:hover {
    transform: none;
  }
}
<<<END>>>