.page-faq {
  background: var(--night);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(34px, 6vw, 76px) 0 clamp(30px, 4.5vw, 56px);
  background:
    radial-gradient(120% 110% at 88% -10%, rgba(58, 44, 110, 0.58) 0%, rgba(10, 21, 36, 0) 58%),
    linear-gradient(180deg, rgba(11, 42, 38, 0.92) 0%, rgba(10, 21, 36, 0.25) 68%, rgba(10, 21, 36, 0) 100%);
  border-bottom: 1px solid var(--hair);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(90deg, var(--grid) 1px, transparent 1px),
    linear-gradient(0deg, var(--grid) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -16%;
  top: -45%;
  width: 44%;
  height: 190%;
  background: linear-gradient(190deg, rgba(41, 231, 206, 0.17), rgba(41, 231, 206, 0) 62%);
  transform: skewX(-14deg);
  pointer-events: none;
}

.page-faq .faq-hero .shell {
  position: relative;
  z-index: 1;
}

.page-faq .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-faq .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  transition: color 0.16s ease;
}

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

.page-faq .faq-hero__kicker {
  margin: 24px 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-faq .faq-hero h1 {
  margin: 0 0 20px;
  max-width: 17em;
  font-size: clamp(28px, 6vw, 56px);
  line-height: 1.12;
  font-weight: 900;
  letter-spacing: -0.02em;
}

.page-faq .faq-hero__lede {
  max-width: 44ch;
  margin: 0;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  color: rgba(237, 244, 242, 0.82);
}

/* ---------- 正文骨架 ---------- */

.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding-top: clamp(32px, 5vw, 60px);
  padding-bottom: clamp(64px, 9vw, 120px);
}

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

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

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

.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 0;
  border-bottom: 1px solid var(--hair);
  color: var(--mist);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  transition: color 0.18s ease;
}

.page-faq .faq-rail__link::before {
  content: "";
  flex: 0 0 auto;
  align-self: center;
  width: 0;
  height: 2px;
  background: var(--orange);
  transition: width 0.2s ease;
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--paper);
}

.page-faq .faq-rail__link:hover::before {
  width: 10px;
}

.page-faq .faq-rail__link.is-active {
  color: var(--paper);
  font-weight: 700;
}

.page-faq .faq-rail__link.is-active::before {
  width: 20px;
}

.page-faq .faq-rail__no {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan);
  letter-spacing: 0.06em;
}

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

/* ---------- 搜索过滤 ---------- */

.page-faq .faq-search {
  margin-bottom: 8px;
}

.page-faq .faq-search__label {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-faq .faq-search__field {
  position: relative;
}

.page-faq .faq-search__icon {
  position: absolute;
  left: 16px;
  top: 50%;
  width: 12px;
  height: 12px;
  margin-top: -8px;
  border: 1px solid var(--cyan);
  border-radius: 50%;
  pointer-events: none;
}

.page-faq .faq-search__icon::after {
  content: "";
  position: absolute;
  right: -5px;
  bottom: -4px;
  width: 6px;
  height: 1px;
  background: var(--cyan);
  transform: rotate(45deg);
}

.page-faq .filter__input {
  width: 100%;
  padding: 14px 16px 14px 42px;
  background: var(--night-deep);
  border: 1px solid var(--hair);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.4;
  outline: none;
  transition: border-color 0.16s ease;
}

.page-faq .filter__input::placeholder {
  color: var(--mist);
}

.page-faq .filter__input:focus {
  border-color: var(--cyan);
}

/* ---------- 分组标题 ---------- */

.page-faq .faq-group {
  padding-top: clamp(38px, 5vw, 58px);
}

.page-faq .chapter-no {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-faq .chapter-no::after {
  content: "";
  width: 84px;
  height: 1px;
  background: var(--cyan);
  opacity: 0.55;
}

.page-faq .faq-group__title {
  margin: 0 0 10px;
  font-size: clamp(21px, 3.4vw, 30px);
  line-height: 1.22;
  font-weight: 900;
  letter-spacing: -0.01em;
}

.page-faq .faq-group__sub {
  margin: 0 0 20px;
  max-width: 50ch;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(237, 244, 242, 0.72);
}

/* ---------- 三步清单 ---------- */

.page-faq .step-list {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
}

.page-faq .step-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "no body"
    "no check";
  align-items: start;
  gap: 4px 16px;
  padding: 18px 0;
  border-bottom: 1px dashed var(--hair);
}

.page-faq .step-item__no {
  grid-area: no;
  margin-top: 2px;
  padding-left: 10px;
  border-left: 2px solid var(--cyan);
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-faq .step-item__body {
  grid-area: body;
  min-width: 0;
}

.page-faq .step-item__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
}

.page-faq .step-item__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(237, 244, 242, 0.78);
}

.page-faq .step-check {
  grid-area: check;
  justify-self: start;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-top: 8px;
  padding: 5px 10px;
  border: 1px solid var(--hair);
  font-size: 12px;
  color: var(--mist);
  cursor: pointer;
  user-select: none;
  transition: border-color 0.16s ease, color 0.16s ease;
}

.page-faq .step-check:hover {
  border-color: var(--cyan);
  color: var(--paper);
}

.page-faq .step-check input {
  width: 14px;
  height: 14px;
  margin: 0;
  accent-color: var(--orange);
}

/* ---------- 问答手风琴 ---------- */

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

.page-faq .faq-item__q {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}

.page-faq .accordion__btn {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: start;
  gap: 12px;
  width: 100%;
  padding: 17px 0;
  background: none;
  border: 0;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: clamp(15px, 1.7vw, 17px);
  font-weight: 700;
  line-height: 1.55;
  text-align: left;
  cursor: pointer;
  transition: color 0.16s ease;
}

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

.page-faq .faq-item__no {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

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

.page-faq .faq-item__chev {
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  margin-top: 7px;
  border-right: 1px solid var(--mist);
  border-bottom: 1px solid var(--mist);
  transform: rotate(45deg);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.page-faq .accordion__btn[aria-expanded="true"] .faq-item__chev {
  transform: rotate(225deg);
  border-color: var(--orange);
}

.page-faq .accordion__panel {
  position: relative;
  padding: 0 0 20px 26px;
}

.page-faq .accordion__panel::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 2px;
  bottom: 24px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(41, 231, 206, 0));
}

.page-faq .faq-a {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(237, 244, 242, 0.82);
}

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

.page-faq .faq-links {
  margin: 20px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-links a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(41, 231, 206, 0.45);
}

.page-faq .faq-links a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 配图 ---------- */

.page-faq .faq-shot {
  margin: 0 0 22px;
}

.page-faq .faq-shot img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--hair);
  filter: saturate(0.8) contrast(1.05) brightness(0.82);
}

.page-faq .faq-shot__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 分组色调 ---------- */

.page-faq .faq-group--android .chapter-no {
  color: var(--orange);
}

.page-faq .faq-group--android .chapter-no::after {
  background: var(--orange);
}

.page-faq .faq-group--rank .chapter-no {
  color: var(--gold);
}

.page-faq .faq-group--rank .chapter-no::after {
  background: var(--gold);
}

.page-faq .faq-group--feedback {
  position: relative;
}

.page-faq .faq-group--feedback::before {
  content: "";
  position: absolute;
  top: clamp(20px, 3vw, 32px);
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--wine) 0%, rgba(124, 31, 53, 0) 78%);
}

.page-faq .faq-group--feedback .chapter-no {
  color: var(--paper);
}

.page-faq .faq-group--feedback .chapter-no::after {
  background: var(--wine);
}

.page-faq .faq-group--device .chapter-no {
  color: var(--mist);
}

.page-faq .faq-group--device .chapter-no::after {
  background: var(--mist);
}

/* ---------- 收尾 ---------- */

.page-faq .faq-outro {
  margin-top: clamp(52px, 7vw, 84px);
  border: 1px solid var(--hair);
  background: linear-gradient(150deg, rgba(58, 44, 110, 0.45), rgba(11, 42, 38, 0.6));
  overflow: hidden;
}

.page-faq .faq-outro__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 4;
  object-fit: cover;
  filter: saturate(0.72) brightness(0.66);
}

.page-faq .faq-outro__body {
  padding: clamp(24px, 4vw, 42px);
}

.page-faq .faq-outro__title {
  margin: 0 0 12px;
  font-size: clamp(20px, 3vw, 28px);
  line-height: 1.25;
  font-weight: 900;
  letter-spacing: -0.01em;
}

.page-faq .faq-outro__text {
  margin: 0 0 22px;
  max-width: 46ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(237, 244, 242, 0.8);
}

.page-faq .faq-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-faq .step-item {
    grid-template-columns: auto minmax(0, 1fr) auto;
    grid-template-areas: "no .page-faq check";
    align-items: start;
    gap: 0 18px;
  }

  .page-faq .step-check {
    margin-top: 2px;
  }

  .page-faq .accordion__panel {
    padding-left: 32px;
  }

  .page-faq .accordion__panel::before {
    left: 6px;
  }
}

@media (min-width: 1020px) {
  .page-faq .faq-body {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 64px);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 116px;
  }

  .page-faq .faq-rail__link {
    font-size: 13.5px;
  }

  .page-faq .faq-group__sub {
    font-size: 14.5px;
  }

  .page-faq .faq-a {
    max-width: 46ch;
  }

  .page-faq .faq-outro__media img {
    aspect-ratio: 21 / 9;
  }
}

@media (min-width: 1240px) {
  .page-faq .faq-hero h1 {
    max-width: 15em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-rail__link::before,
  .page-faq .faq-item__chev,
  .page-faq .filter__input,
  .page-faq .step-check {
    transition: none;
  }
}