.page-faq {
  --faq-gap: clamp(1.25rem, 3vw, 2.5rem);
  --faq-rail: 250px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(1.25rem, 4vw, 2.5rem) 0 clamp(2rem, 5vw, 3.5rem);
  background:
    radial-gradient(120% 110% at 88% -12%, rgba(213, 31, 43, 0.32), transparent 62%),
    linear-gradient(180deg, var(--ink) 0%, var(--night) 100%);
  border-bottom: 1px solid var(--steel);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 44%, rgba(213, 31, 43, 0.16) 44.25%, rgba(213, 31, 43, 0.16) 57%, transparent 57.25%);
  pointer-events: none;
  z-index: 0;
}

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

.page-faq .faq-hero__crumb {
  margin-bottom: clamp(1rem, 3vw, 1.75rem);
}

.page-faq .faq-hero__frame {
  position: relative;
  padding: clamp(1.25rem, 4.5vw, 3rem);
  background: rgba(11, 11, 13, 0.62);
  border: 1px solid var(--steel);
  box-shadow: 0 30px 70px -40px rgba(0, 0, 0, 0.95);
  backdrop-filter: blur(2px);
}

.page-faq .faq-hero__frame::before,
.page-faq .faq-hero__frame::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  border: 2px solid var(--red);
}

.page-faq .faq-hero__frame::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-faq .faq-hero__frame::after {
  right: -1px;
  bottom: -1px;
  border-top: 0;
  border-left: 0;
}

.page-faq .faq-hero h1 {
  margin: 0.5rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 7vw, 4.2rem);
  font-weight: 700;
  line-height: 0.96;
  letter-spacing: -0.02em;
  color: var(--paper);
  text-wrap: balance;
}

.page-faq .faq-hero__lead {
  max-width: 60ch;
  margin: clamp(0.9rem, 2.5vw, 1.4rem) 0 0;
  font-size: clamp(0.95rem, 1.6vw, 1.05rem);
  line-height: 1.75;
  color: var(--mist);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: clamp(1.1rem, 3vw, 1.75rem);
}

/* ---------- 主体骨架 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-gap);
  padding-block: clamp(1.75rem, 5vw, 3.5rem) clamp(3rem, 7vw, 5rem);
}

/* ---------- 侧栏索引 ---------- */
.page-faq .faq-rail__title {
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--red);
}

.page-faq .faq-rail__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  margin: 0 0 1.5rem;
  padding: 0;
  list-style: none;
}

.page-faq .faq-rail__list a {
  display: flex;
  gap: 0.55rem;
  align-items: baseline;
  padding: 0.6rem 0.65rem;
  color: var(--mist);
  font-size: 0.9rem;
  line-height: 1.4;
  text-decoration: none;
  border-left: 2px solid var(--steel);
  transition: color 0.18s var(--ease), background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-faq .faq-rail__list a:hover,
.page-faq .faq-rail__list a:focus-visible {
  color: var(--paper);
  background: rgba(213, 31, 43, 0.12);
  border-left-color: var(--red);
}

.page-faq .faq-rail__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-faq .faq-rail__hot,
.page-faq .faq-rail__recent {
  margin-bottom: 1.35rem;
  padding: 0.9rem 0.95rem;
  background: var(--night);
  border: 1px solid var(--steel);
}

.page-faq .faq-rail__hot-title {
  margin: 0 0 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-faq .faq-rail__hot ul,
.page-faq .faq-rail__recent ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.55rem;
}

.page-faq .faq-rail__hot a {
  display: block;
  color: var(--paper);
  font-size: 0.85rem;
  line-height: 1.5;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
}

.page-faq .faq-rail__hot a:hover,
.page-faq .faq-rail__hot a:focus-visible {
  color: var(--cyan);
  border-bottom-color: rgba(24, 224, 208, 0.5);
}

.page-faq .faq-rail__recent li {
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--mist);
}

.page-faq .faq-rail__when {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

/* ---------- 章节 ---------- */
.page-faq .faq-sec {
  padding-block: clamp(1.75rem, 4vw, 2.75rem);
  border-top: 1px solid var(--steel);
  scroll-margin-top: 6.5rem;
}

.page-faq .faq-sec:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-faq .faq-sec--last {
  padding-bottom: 0;
}

.page-faq .faq-sec__head {
  margin-bottom: clamp(1.1rem, 3vw, 1.75rem);
}

.page-faq .faq-sec__title {
  margin: 0.3rem 0 0.6rem;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4.2vw, 2.6rem);
  font-weight: 700;
  line-height: 1.02;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-sec__lead {
  max-width: 62ch;
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 标签页 ---------- */
.page-faq .faq-tabs {
  margin-bottom: 1.25rem;
}

.page-faq .faq-tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--steel);
}

.page-faq .tabs__btn {
  padding: 0.55rem 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--mist);
  background: transparent;
  border: 1px solid var(--steel);
  border-radius: var(--radius);
  cursor: pointer;
  transition: color 0.18s var(--ease), background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-faq .tabs__btn:hover {
  color: var(--paper);
  border-color: var(--mist);
}

.page-faq .tabs__btn[aria-selected="true"] {
  color: var(--paper);
  background: var(--red);
  border-color: var(--red);
}

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

/* ---------- 问答折叠 ---------- */
.page-faq .qa {
  border-bottom: 1px solid var(--steel);
}

.page-faq .qa:first-of-type {
  border-top: 1px solid var(--steel);
}

.page-faq .qa__q {
  display: flex;
  gap: 0.8rem;
  align-items: baseline;
  padding: 0.95rem 2.4rem 0.95rem 0;
  position: relative;
  list-style: none;
  cursor: pointer;
  font-size: 0.98rem;
  font-weight: 600;
  line-height: 1.55;
  color: var(--paper);
}

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

.page-faq .qa__q::after {
  content: "+";
  position: absolute;
  right: 0.35rem;
  top: 0.9rem;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  line-height: 1;
  color: var(--cyan);
}

.page-faq .qa[open] .qa__q::after {
  content: "\2212";
  color: var(--red);
}

.page-faq .qa__q:hover {
  color: var(--cyan);
}

.page-faq .qa__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--red);
}

.page-faq .qa__a {
  padding: 0 2.4rem 1.15rem 2.2rem;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--mist);
}

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

.page-faq .qa__a a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(24, 224, 208, 0.4);
}

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

/* ---------- 图片 ---------- */
.page-faq .faq-figure {
  margin: clamp(1.25rem, 3vw, 2rem) 0 0;
}

.page-faq .faq-figure .media__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--steel);
}

.page-faq .faq-figure--tall .media__img {
  aspect-ratio: 3 / 4;
}

.page-faq .faq-figure .media__cap {
  margin-top: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 版本说明 ---------- */
.page-faq .faq-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-gap);
}

.page-faq .faq-tags {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.55rem;
}

.page-faq .faq-tags__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.2rem;
  padding: 0.85rem 1rem;
  background: var(--night);
  border-left: 3px solid var(--red);
  border-top: 1px solid var(--steel);
  border-right: 1px solid var(--steel);
  border-bottom: 1px solid var(--steel);
}

.page-faq .faq-tags__key {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--lime);
}

.page-faq .faq-tags__val {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .faq-note {
  margin: clamp(1rem, 3vw, 1.5rem) 0 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--mist);
  max-width: 64ch;
}

.page-faq .faq-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(24, 224, 208, 0.4);
}

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

.page-faq .faq-nums {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(1rem, 3vw, 1.5rem);
  background: var(--steel);
  border: 1px solid var(--steel);
}

.page-faq .faq-nums__item {
  display: grid;
  gap: 0.2rem;
  padding: 0.85rem 0.7rem;
  background: var(--ink);
}

.page-faq .faq-nums__num {
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 4vw, 1.9rem);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-faq .faq-nums__label {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  line-height: 1.4;
  color: var(--mist);
}

/* ---------- 刷新阶段 ---------- */
.page-faq .faq-phases {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0 0 clamp(1.1rem, 3vw, 1.6rem);
  padding: 0;
  list-style: none;
  background: var(--steel);
  border: 1px solid var(--steel);
}

.page-faq .faq-phases__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "num name"
    "num desc";
  align-items: baseline;
  column-gap: 0.75rem;
  row-gap: 0.3rem;
  padding: 0.9rem 0.95rem;
  background: var(--night);
}

.page-faq .faq-phases__num {
  grid-area: num;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  line-height: 1;
  color: rgba(24, 224, 208, 0.45);
}

.page-faq .faq-phases__name {
  grid-area: name;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-faq .faq-phases__desc {
  grid-area: desc;
  font-size: 0.86rem;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 联系 ---------- */
.page-faq .faq-support {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.85rem;
  margin-top: clamp(0.5rem, 2vw, 1rem);
}

.page-faq .faq-support__card {
  padding: 1rem 1.1rem 1.1rem;
  background: var(--night);
  border: 1px solid var(--steel);
  border-left: 3px solid var(--red);
}

.page-faq .faq-support__label {
  margin: 0 0 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .faq-support__val {
  margin: 0;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

.page-faq .faq-support__val a {
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid var(--steel);
}

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

.page-faq .faq-support__hint {
  margin: 0.45rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  line-height: 1.6;
  color: var(--mist);
}

.page-faq .copy-btn {
  margin-top: 0.7rem;
  padding: 0.35rem 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--cyan);
  background: transparent;
  border: 1px solid var(--steel);
  border-radius: var(--radius);
  cursor: pointer;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background 0.18s var(--ease);
}

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

.page-faq .faq-note--tight {
  margin-top: 1.25rem;
}

/* ---------- 平板 ---------- */
@media (min-width: 680px) {
  .page-faq .faq-tags__item {
    grid-template-columns: 7.5rem minmax(0, 1fr);
    gap: 0.75rem;
    align-items: baseline;
  }

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

  .page-faq .faq-phases__item {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "num"
      "name"
      "desc";
    row-gap: 0.45rem;
  }

  .page-faq .faq-support {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq-support__card--wide {
    grid-column: 1 / -1;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
    align-items: start;
  }

  .page-faq .faq-rail__sticky {
    position: sticky;
    top: 8.5rem;
  }

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

  .page-faq .faq-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 260px);
    align-items: start;
  }

  .page-faq .faq-figure--tall {
    margin-top: 0;
  }
}

@media (min-width: 1140px) {
  .page-faq .faq-body {
    grid-template-columns: clamp(240px, 21vw, 290px) minmax(0, 1fr);
  }

  .page-faq .faq-sec {
    padding-block: clamp(2.25rem, 3.6vw, 3.25rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .tabs__btn,
  .page-faq .copy-btn,
  .page-faq .faq-rail__list a,
  .page-faq .faq-rail__hot a {
    transition: none;
  }
}
<<<END>>>