.page-faq {
  --faq-pad: clamp(3rem, 8vw, 6.5rem);
  --faq-gap: clamp(1.5rem, 4vw, 3rem);
  --faq-cut: 18px;
  --faq-cut-sm: 10px;
}

/* ---------- 首屏 ---------- */
.page-faq .acad-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(7rem, 15vw, 11rem) 0 clamp(3rem, 6vw, 4.5rem);
}
.page-faq .acad-hero::before {
  content: "";
  position: absolute;
  inset: -32% -15% auto -15%;
  height: 82%;
  background:
    radial-gradient(55% 78% at 76% 16%, rgba(108, 76, 241, .30), transparent 70%),
    radial-gradient(46% 68% at 8% 0%, rgba(47, 191, 143, .14), transparent 72%);
  pointer-events: none;
}
.page-faq .acad-hero > .wrap {
  position: relative;
  z-index: 1;
}
.page-faq .acad-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 5.6vw, 3.8rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: .9rem 0 1.1rem;
}
.page-faq .acad-hero .lead {
  max-width: 46ch;
  color: var(--on-dark-soft);
  font-size: clamp(1rem, 1.6vw, 1.1rem);
  line-height: 1.78;
  margin: 0 0 1.6rem;
}
.page-faq .acad-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}
.page-faq .acad-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(2rem, 5vw, 3rem);
  margin-top: clamp(1.5rem, 3vw, 2.5rem);
}
@media (min-width: 940px) {
  .page-faq .acad-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }
}

.page-faq .fact-row {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-ink);
  border: 1px solid var(--line-ink);
}
.page-faq .fact {
  background: rgba(11, 20, 48, .74);
  padding: 1rem 1.05rem 1.15rem;
}
.page-faq .fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  line-height: 1.1;
  color: var(--violet-300);
  letter-spacing: -0.02em;
}
.page-faq .fact__label {
  display: block;
  margin-top: .4rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--on-dark-mute);
}

/* ---------- 通用区块头 ---------- */
.page-faq .sec-head {
  display: flex;
  flex-direction: column;
  gap: .85rem;
  margin-bottom: clamp(1.75rem, 4vw, 2.5rem);
}
.page-faq .faq-num {
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 4.6vw, 2.9rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--violet-500);
}
.page-faq .surface-ink .faq-num,
.page-faq .surface-deep .faq-num {
  color: var(--violet-300);
}
.page-faq .h-section {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.4rem, 3.6vw, 2.25rem);
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin: 0 0 .55rem;
}
.page-faq .sec-head .lead {
  max-width: 56ch;
  margin: 0;
  font-size: 1rem;
  line-height: 1.78;
}
@media (min-width: 780px) {
  .page-faq .sec-head {
    flex-direction: row;
    gap: 2.25rem;
    align-items: flex-start;
  }
  .page-faq .faq-num {
    flex: 0 0 auto;
    padding-top: .15rem;
  }
}

/* ---------- 01 词条分类 ---------- */
.page-faq .acad-index {
  padding: var(--faq-pad) 0;
}
.page-faq .filter-bar {
  display: grid;
  gap: .45rem;
  padding: clamp(1.05rem, 3vw, 1.55rem);
  margin-bottom: clamp(1.5rem, 4vw, 2.25rem);
  background: rgba(169, 155, 255, .06);
  border: 1px solid var(--line-ink);
  clip-path: polygon(
    0 0,
    calc(100% - var(--faq-cut)) 0,
    100% var(--faq-cut),
    100% 100%,
    var(--faq-cut) 100%,
    0 calc(100% - var(--faq-cut))
  );
}
.page-faq .filter-bar__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--violet-300);
}
.page-faq .filter-bar__input {
  width: 100%;
  background: transparent;
  border: 0;
  border-bottom: 1px dashed var(--line-ink-strong);
  color: var(--on-dark);
  font-family: var(--font-body);
  font-size: 1rem;
  padding: .5rem 0;
}
.page-faq .filter-bar__input::placeholder {
  color: var(--on-dark-mute);
}
.page-faq .filter-bar__input:focus-visible {
  outline: 2px solid var(--violet-300);
  outline-offset: 4px;
}
.page-faq .filter-bar__hint {
  margin: 0;
  font-size: 11px;
  letter-spacing: .05em;
  font-family: var(--font-mono);
  color: var(--on-dark-mute);
}

.page-faq .cat-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-ink);
  border-top: 1px solid var(--line-ink);
  border-bottom: 1px solid var(--line-ink);
}
.page-faq .cat-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .3rem 1.15rem;
  align-items: baseline;
  padding: clamp(1rem, 2.8vw, 1.45rem) clamp(1rem, 3vw, 1.5rem);
  background: rgba(11, 20, 48, .58);
}
.page-faq .cat-item__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--moss-lift);
}
.page-faq .cat-item__k {
  margin: 0 0 .35rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.02rem, 2.2vw, 1.2rem);
  color: var(--on-dark);
}
.page-faq .cat-item__desc {
  margin: 0;
  font-size: .94rem;
  line-height: 1.7;
  color: var(--on-dark-soft);
  max-width: 62ch;
}
@media (min-width: 900px) {
  .page-faq .cat-item {
    grid-template-columns: auto minmax(0, 22ch) minmax(0, 1fr);
    gap: .3rem 2rem;
    align-items: start;
  }
  .page-faq .cat-item__k {
    margin-bottom: 0;
    padding-top: .1rem;
  }
}

/* ---------- 02 备份 5 小步 ---------- */
.page-faq .acad-backup {
  padding: var(--faq-pad) 0;
  background: var(--cream-2);
}
.page-faq .acad-backup .figure img,
.page-faq .acad-compare .figure img {
  border-color: var(--line-paper);
}
.page-faq .figure {
  margin: 0 0 clamp(2rem, 5vw, 3rem);
}
.page-faq .figure img {
  display: block;
  width: 100%;
  height: auto;
  background: var(--ink-700);
  border: 1px solid var(--line-ink);
  object-fit: cover;
}
.page-faq .figcaption {
  margin-top: .7rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--moss);
}
.page-faq .surface-ink .figcaption,
.page-faq .surface-deep .figcaption {
  color: var(--moss-lift);
}

.page-faq .backup-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.75rem, 4vw, 2.75rem);
}
@media (min-width: 960px) {
  .page-faq .backup-layout {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    align-items: start;
  }
  .page-faq .steps-aside {
    position: sticky;
    top: 6.5rem;
  }
}
.page-faq .steps-aside .note {
  margin: 0 0 .7rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--moss);
}
.page-faq .steps-aside__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .35rem;
  counter-reset: none;
}
.page-faq .steps-aside__list a {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .65rem;
  align-items: baseline;
  padding: .55rem .7rem;
  border-left: 2px solid transparent;
  color: var(--on-light-soft);
  text-decoration: none;
  font-size: .875rem;
  line-height: 1.5;
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}
.page-faq .steps-aside__list a:hover {
  color: var(--violet-500);
  border-left-color: var(--violet-500);
  background: rgba(108, 76, 241, .06);
}
.page-faq .steps-aside__list a:focus-visible {
  outline: 2px solid var(--violet-500);
  outline-offset: 2px;
}
.page-faq .steps-aside__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--moss);
}

.page-faq .steps-main {
  display: grid;
  gap: clamp(1.75rem, 4.5vw, 2.75rem);
}
.page-faq .bstep {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0 clamp(.8rem, 2vw, 1.4rem);
}
.page-faq .bstep__num {
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3.6vw, 2rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--violet-500);
  padding-top: .55rem;
}
.page-faq .bstep__body {
  background: var(--cream);
  border: 1px solid var(--line-paper);
  padding: clamp(1.05rem, 3vw, 1.75rem);
  clip-path: polygon(
    var(--faq-cut) 0,
    100% 0,
    100% calc(100% - var(--faq-cut)),
    calc(100% - var(--faq-cut)) 100%,
    0 100%,
    0 var(--faq-cut)
  );
}
.page-faq .bstep__h {
  margin: 0;
}
.page-faq .bstep__head {
  width: 100%;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 1rem;
  background: transparent;
  border: 0;
  padding: 0;
  text-align: left;
  cursor: pointer;
  color: var(--slate);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.05rem, 2.4vw, 1.35rem);
  line-height: 1.35;
}
.page-faq .bstep__head:focus-visible {
  outline: 2px solid var(--violet-500);
  outline-offset: 4px;
}
.page-faq .bstep__mark,
.page-faq .myth__mark {
  width: 11px;
  height: 11px;
  border-right: 2px solid var(--violet-500);
  border-bottom: 2px solid var(--violet-500);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform 200ms var(--ease);
  flex: 0 0 auto;
}
.page-faq .bstep__head[aria-expanded="true"] .bstep__mark,
.page-faq .myth__head[aria-expanded="true"] .myth__mark {
  transform: rotate(225deg) translate(-2px, -2px);
}
.page-faq .bstep__panel {
  padding-top: .85rem;
}
.page-faq .bstep__panel[hidden] {
  display: none;
}
.page-faq .bstep__panel > p {
  margin: 0 0 .85rem;
  font-size: .95rem;
  line-height: 1.75;
  color: var(--on-light-soft);
  max-width: 54ch;
}
.page-faq .bstep__dl {
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: .55rem 1rem;
}
.page-faq .bstep__dl dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--moss);
  padding-top: .2rem;
}
.page-faq .bstep__dl dd {
  margin: 0;
  font-size: .95rem;
  line-height: 1.75;
  color: var(--on-light-soft);
}
@media (min-width: 620px) {
  .page-faq .bstep__dl {
    grid-template-columns: auto minmax(0, 1fr);
  }
}
.page-faq .bstep__stop {
  margin: .9rem 0 0;
  padding: .7rem .85rem;
  border-left: 3px solid var(--orange);
  background: rgba(242, 136, 75, .12);
  font-size: .9rem;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 03 三种方式对照 ---------- */
.page-faq .acad-compare {
  padding: var(--faq-pad) 0;
}
.page-faq .cmp-scroller {
  overflow-x: auto;
  overscroll-behavior-x: contain;
  border: 1px solid var(--line-paper);
  background: rgba(255, 255, 255, .56);
  -webkit-overflow-scrolling: touch;
}
.page-faq .cmp-scroller:focus-visible {
  outline: 2px solid var(--violet-500);
  outline-offset: 3px;
}
.page-faq .cmp-hint {
  margin: 0;
  padding: .55rem 1rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--violet-500);
  border-bottom: 1px dashed var(--line-paper);
  white-space: nowrap;
}
.page-faq .cmp {
  width: 100%;
  min-width: 700px;
  border-collapse: collapse;
  font-size: .9rem;
}
.page-faq .cmp__cap {
  caption-side: top;
  text-align: left;
  padding: .75rem 1rem .35rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--moss);
}
.page-faq .cmp th,
.page-faq .cmp td {
  text-align: left;
  padding: .8rem 1rem;
  border-bottom: 1px solid var(--line-paper);
  vertical-align: top;
  line-height: 1.65;
}
.page-faq .cmp thead th {
  background: var(--ink-700);
  color: var(--on-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .08em;
  white-space: nowrap;
  border-bottom: 1px solid var(--line-ink-strong);
}
.page-faq .cmp tbody th {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--slate);
  white-space: nowrap;
}
.page-faq .cmp tbody tr:last-child th,
.page-faq .cmp tbody tr:last-child td {
  border-bottom: 0;
}
.page-faq .cmp tbody tr:nth-child(even) th,
.page-faq .cmp tbody tr:nth-child(even) td {
  background: rgba(185, 113, 79, .07);
}
.page-faq .cmp td {
  color: var(--on-light-soft);
}
.page-faq .cmp-foot {
  margin: 1rem 0 0;
  font-size: .875rem;
  line-height: 1.75;
  color: var(--on-light-mute);
  max-width: 60ch;
}

/* ---------- 04 高频问答 ---------- */
.page-faq .acad-qa {
  padding: var(--faq-pad) 0;
}
.page-faq .qa-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-ink);
  border: 1px solid var(--line-ink);
}
@media (min-width: 840px) {
  .page-faq .qa-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
.page-faq .qa {
  background: rgba(11, 20, 48, .62);
  padding: clamp(1.15rem, 3vw, 1.75rem);
}
.page-faq .qa__no {
  margin: 0 0 .55rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--green);
}
.page-faq .qa__q {
  margin: 0 0 .6rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1rem, 2.2vw, 1.16rem);
  line-height: 1.45;
  color: var(--on-dark);
}
.page-faq .qa__a {
  margin: 0;
  font-size: .94rem;
  line-height: 1.78;
  color: var(--on-dark-soft);
  max-width: 48ch;
}

/* ---------- 05 常见误解 ---------- */
.page-faq .acad-myth {
  padding: var(--faq-pad) 0;
  background: var(--cream-2);
}
.page-faq .myth-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(1rem, 2.5vw, 1.5rem);
}
.page-faq .myth {
  border-left: 4px solid var(--orange);
  background: rgba(255, 255, 255, .66);
  padding: clamp(.95rem, 2.6vw, 1.35rem) clamp(1rem, 3vw, 1.6rem);
}
.page-faq .myth__h {
  margin: 0;
}
.page-faq .myth__head {
  width: 100%;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: .85rem;
  background: transparent;
  border: 0;
  padding: 0;
  text-align: left;
  cursor: pointer;
  color: var(--slate);
  font-family: var(--font-body);
  font-size: clamp(.96rem, 2.1vw, 1.05rem);
  font-weight: 600;
  line-height: 1.5;
}
.page-faq .myth__head:focus-visible {
  outline: 2px solid var(--violet-500);
  outline-offset: 4px;
}
.page-faq .myth__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--clay);
  border: 1px solid rgba(242, 136, 75, .55);
  padding: .2rem .45rem;
  white-space: nowrap;
}
.page-faq .myth__panel {
  padding-top: .75rem;
}
.page-faq .myth__panel[hidden] {
  display: none;
}
.page-faq .myth__panel p {
  margin: 0;
  font-size: .94rem;
  line-height: 1.78;
  color: var(--on-light-soft);
  max-width: 60ch;
}

/* ---------- 06 风险与延伸 ---------- */
.page-faq .acad-risk {
  padding: var(--faq-pad) 0;
}
.page-faq .risk-band {
  border-left: 4px solid var(--orange);
  background: rgba(242, 136, 75, .09);
  padding: clamp(1.25rem, 3.5vw, 2rem);
  margin-bottom: clamp(2.25rem, 5vw, 3.25rem);
}
.page-faq .risk-band h2 {
  margin: 0 0 .7rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.2rem, 3.2vw, 1.8rem);
  line-height: 1.3;
  color: var(--on-dark);
}
.page-faq .risk-band p {
  margin: 0;
  font-size: .97rem;
  line-height: 1.8;
  color: var(--on-dark-soft);
  max-width: 62ch;
}
.page-faq .read-more__title {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .1em;
  color: var(--moss-lift);
}
.page-faq .read-more__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-ink);
  border: 1px solid var(--line-ink);
}
@media (min-width: 780px) {
  .page-faq .read-more__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-faq .read-more__list li:last-child {
    grid-column: 1 / -1;
  }
}
.page-faq .read-more__list a {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .9rem;
  align-items: baseline;
  height: 100%;
  padding: 1rem 1.15rem;
  background: var(--ink-900);
  color: var(--on-dark);
  text-decoration: none;
  font-size: .94rem;
  line-height: 1.7;
  transition: background 180ms var(--ease), color 180ms var(--ease);
}
.page-faq .read-more__list a:hover {
  background: var(--ink-700);
  color: var(--violet-300);
}
.page-faq .read-more__list a:focus-visible {
  outline: 2px solid var(--violet-300);
  outline-offset: -2px;
}
.page-faq .read-more__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--violet-300);
}

/* ---------- 窄屏收敛 ---------- */
@media (max-width: 620px) {
  .page-faq {
    --faq-cut: 12px;
  }
  .page-faq .acad-hero {
    padding-top: clamp(5.5rem, 22vw, 7rem);
  }
  .page-faq .bstep {
    gap: 0 .7rem;
  }
  .page-faq .bstep__num {
    font-size: 1.15rem;
    padding-top: .5rem;
  }
  .page-faq .bstep__body {
    padding: 1rem;
  }
  .page-faq .myth__head {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: .5rem .75rem;
  }
  .page-faq .myth__tag {
    grid-column: 1 / -1;
    justify-self: start;
  }
  .page-faq .cmp {
    min-width: 620px;
    font-size: .85rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .bstep__mark,
  .page-faq .myth__mark,
  .page-faq .read-more__list a,
  .page-faq .steps-aside__list a {
    transition: none;
  }
}
<<<END>>>