.page-faq {
  --faq-gap: clamp(20px, 4vw, 48px);
  --faq-paper-ink: #2A1A12;
  --faq-paper-soft: #5A4436;
}

/* ---------- 面包屑 ---------- */
.page-faq .breadcrumbs {
  padding-block: clamp(14px, 2.4vw, 22px) 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--steel);
}

.page-faq .breadcrumbs a {
  color: var(--steel);
  text-decoration: none;
}

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

.page-faq .breadcrumbs [aria-current="page"] {
  color: var(--white);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  margin-top: clamp(16px, 3vw, 28px);
  padding-block: clamp(26px, 5vw, 56px) clamp(30px, 5vw, 60px);
  border-block: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(13, 35, 64, 0.9) 0%, rgba(6, 19, 35, 0) 78%),
    repeating-linear-gradient(90deg, var(--line-soft) 0 1px, transparent 1px 92px);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  top: 0;
  width: 4px;
  height: 56px;
  background: var(--orange);
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-faq .faq-hero__lead h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 5.4vw, 3.5rem);
  line-height: 1.08;
  letter-spacing: 0.01em;
  font-weight: 800;
  color: var(--white);
  max-width: 20em;
}

.page-faq .faq-hero__deck {
  margin: 18px 0 0;
  max-width: 36em;
  font-size: 1.0125rem;
  line-height: 1.8;
  color: rgba(247, 250, 255, 0.78);
}

.page-faq .faq-hero__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

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

/* 步骤树 */
.page-faq .step-tree {
  list-style: none;
  margin: 0;
  padding: 0;
  border-inline-start: 1px solid var(--line-strong);
}

.page-faq .step-tree__item a {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 12px;
  padding: 11px 8px 11px 18px;
  text-decoration: none;
  color: var(--white);
  border-bottom: 1px solid var(--line-soft);
  transition: background 0.22s var(--ease), padding-left 0.22s var(--ease);
}

.page-faq .step-tree__item a::before {
  content: "";
  position: absolute;
  inset-inline-start: -4px;
  top: 50%;
  width: 7px;
  height: 7px;
  background: var(--ink);
  border: 1px solid var(--amber);
  transform: translateY(-50%);
  transition: background 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-faq .step-tree__item a:hover,
.page-faq .step-tree__item a:focus-visible {
  background: rgba(13, 35, 64, 0.7);
  padding-inline-start: 24px;
}

.page-faq .step-tree__item a:hover::before,
.page-faq .step-tree__item a:focus-visible::before {
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-faq .step-tree__item a:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

.page-faq .step-tree__num {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-faq .step-tree__label {
  position: relative;
  font-size: 0.9rem;
  line-height: 1.4;
}

.page-faq .step-tree__label::after {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  bottom: -3px;
  width: 0;
  height: 1px;
  background: var(--cyan);
  transition: width 0.26s var(--ease);
}

.page-faq .step-tree__item a:hover .step-tree__label::after,
.page-faq .step-tree__item a:focus-visible .step-tree__label::after {
  width: 100%;
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: var(--faq-gap);
  padding-block: clamp(26px, 4vw, 52px) clamp(40px, 6vw, 80px);
}

/* 章节轨道 */
.page-faq .faq-rail {
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-faq .faq-rail__kicker {
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--steel);
  text-transform: uppercase;
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--cyan) transparent;
}

.page-faq .faq-rail__item a {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  white-space: nowrap;
  padding: 7px 10px;
  border: 1px solid var(--line);
  color: var(--white);
  text-decoration: none;
  font-size: 0.8rem;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-faq .faq-rail__item .mono {
  color: var(--amber);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
}

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

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

.page-faq .faq-rail__note {
  display: none;
  margin: 0;
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 问答流 ---------- */
.page-faq .faq-flow {
  display: grid;
  gap: 0;
  min-width: 0;
}

.page-faq .qa {
  border-top: 1px solid var(--line);
  scroll-margin-top: 96px;
}

.page-faq .qa:last-of-type {
  border-bottom: 1px solid var(--line);
}

.page-faq .qa__head {
  display: flex;
  align-items: baseline;
  gap: clamp(10px, 2vw, 18px);
  padding: clamp(16px, 2.6vw, 24px) 0;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .qa__head:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}

.page-faq .qa__num {
  flex: 0 0 auto;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-faq .qa__title {
  margin: 0;
  font-size: clamp(1.02rem, 2.3vw, 1.4rem);
  line-height: 1.42;
  font-weight: 700;
  color: var(--white);
  transition: color 0.2s var(--ease);
}

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

.page-faq .qa__arrow {
  flex: 0 0 auto;
  margin-inline-start: auto;
  align-self: center;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
  transform: rotate(45deg);
  transition: transform 0.26s var(--ease);
}

.page-faq .qa[open] .qa__arrow {
  transform: rotate(225deg);
}

.page-faq .qa__body {
  padding-bottom: clamp(20px, 3vw, 34px);
  max-width: 42em;
}

.page-faq .qa__body p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: rgba(247, 250, 255, 0.76);
}

.page-faq .qa__tip {
  margin-top: 18px;
  padding-inline-start: 12px;
  border-inline-start: 2px solid var(--cyan);
  font-size: 0.86rem !important;
  line-height: 1.75;
  color: var(--steel) !important;
}

.page-faq .qa__link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 243, 220, 0.4);
}

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

.page-faq .qa__mail {
  color: var(--white);
  border-bottom: 1px dashed var(--line-strong);
  word-break: break-all;
}

/* 步骤 */
.page-faq .steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-faq .steps__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: start;
}

.page-faq .steps__num {
  display: inline-block;
  min-width: 1.6em;
  text-align: center;
  padding: 2px 5px;
  border: 1px solid var(--line-strong);
  font-size: 0.75rem;
  line-height: 1.35;
  color: var(--orange);
}

.page-faq .steps__text h3 {
  margin: 0 0 6px;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 0.01em;
}

/* 路径条 */
.page-faq .path {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-inline-start: 3px solid var(--orange);
  background: var(--ink-2);
  font-family: var(--font-mono);
  font-size: 0.76rem;
}

.page-faq .path__node {
  padding: 3px 7px;
  border: 1px solid var(--line-strong);
  color: var(--white);
}

.page-faq .path__node--hot {
  border-color: var(--orange);
  color: var(--orange);
}

.page-faq .path__arrow {
  color: var(--steel);
}

/* 档位卡 */
.page-faq .tiers {
  display: grid;
  gap: 10px;
  margin-top: 20px;
}

.page-faq .tier {
  display: grid;
  gap: 4px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  background: rgba(13, 35, 64, 0.72);
}

.page-faq .tier__k {
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--steel);
}

.page-faq .tier__v {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--white);
}

/* 关注列表三卡 */
.page-faq .habits {
  display: grid;
  gap: 12px;
}

.page-faq .habit {
  padding: 14px 16px;
  border: 1px solid var(--line);
  background: rgba(13, 35, 64, 0.6);
  transition: transform 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-faq .habit:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
}

.page-faq .habit__k {
  display: block;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-faq .habit__v {
  margin: 6px 0 0 !important;
  font-size: 0.98rem !important;
  font-weight: 700;
  color: var(--white) !important;
}

.page-faq .habit__d {
  margin: 4px 0 0 !important;
  font-size: 0.82rem !important;
  line-height: 1.7 !important;
  color: var(--steel) !important;
}

/* 图 */
.page-faq .faq-figure {
  margin: 22px 0 0;
  display: grid;
  gap: 8px;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  background: var(--ink-2);
}

.page-faq .faq-figure--tall {
  max-width: 320px;
  margin-inline-start: auto;
}

.page-faq .faq-figure__cap {
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  line-height: 1.6;
  color: var(--steel);
}

/* 纸面章节 */
.page-faq .qa--paper {
  margin-block: 0;
  padding-inline: clamp(16px, 3vw, 28px);
  background: var(--paper);
  border-top-color: rgba(42, 26, 18, 0.18);
  border-bottom: 1px solid rgba(42, 26, 18, 0.18);
}

.page-faq .qa--paper .qa__title {
  color: var(--faq-paper-ink);
}

.page-faq .qa--paper .qa__head:hover .qa__title,
.page-faq .qa--paper .qa__head:focus-visible .qa__title {
  color: #A8410F;
}

.page-faq .qa--paper .qa__num {
  color: #A8410F;
}

.page-faq .qa--paper .qa__arrow {
  border-right-color: #A8410F;
  border-bottom-color: #A8410F;
}

.page-faq .qa--paper .qa__body p {
  color: var(--faq-paper-soft);
}

.page-faq .qa--paper .steps__num {
  border-color: rgba(42, 26, 18, 0.28);
  color: #A8410F;
}

.page-faq .qa--paper .steps__text h3 {
  color: var(--faq-paper-ink);
}

.page-faq .qa--paper .qa__tip {
  border-inline-start-color: #C99A45;
  color: #6B5140 !important;
}

.page-faq .qa--paper .qa__link {
  color: #A8410F;
  border-bottom-color: rgba(168, 65, 15, 0.45);
}

/* 继续了解 */
.page-faq .faq-next {
  margin-top: clamp(28px, 4vw, 48px);
}

.page-faq .faq-next__title {
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--steel);
  text-transform: uppercase;
}

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

.page-faq .next-card {
  display: grid;
  gap: 8px;
  padding: 16px;
  border: 1px solid var(--line);
  text-decoration: none;
  transition: transform 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-faq .next-card__k {
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-faq .next-card__t {
  font-size: 0.92rem;
  line-height: 1.6;
  font-weight: 700;
  color: var(--white);
}

.page-faq .next-card:hover,
.page-faq .next-card:focus-visible {
  transform: translateY(-2px);
  border-color: var(--cyan);
}

.page-faq .next-card:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-faq .tiers {
    grid-template-columns: repeat(3, 1fr);
  }

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

@media (min-width: 720px) {
  .page-faq .habits {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(260px, 0.85fr);
    align-items: start;
  }

  .page-faq .step-tree {
    margin-top: 6px;
  }

  .page-faq .faq-body {
    grid-template-columns: minmax(176px, 210px) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: clamp(20px, 3vw, 36px);
    align-self: start;
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
    border-inline-start: 1px solid var(--line);
  }

  .page-faq .faq-rail__item a {
    border: 0;
    border-bottom: 1px solid var(--line-soft);
    padding: 10px 8px 10px 14px;
    white-space: normal;
    font-size: 0.82rem;
  }

  .page-faq .faq-rail__note {
    display: block;
    padding-inline-start: 14px;
    border-inline-start: 1px solid var(--line);
  }

  .page-faq .faq-next__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .step-tree__item a,
  .page-faq .step-tree__label::after,
  .page-faq .qa__arrow,
  .page-faq .habit,
  .page-faq .next-card {
    transition: none;
  }

  .page-faq .habit:hover,
  .page-faq .next-card:hover {
    transform: none;
  }
}
<<<END>>>