.page-faq {
  background: var(--ink-900);
  color: var(--cold);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  border-bottom: 1px solid var(--hair);
}

.page-faq .faq-hero__media {
  position: absolute;
  inset: 0;
  z-index: -2;
  overflow: hidden;
}

.page-faq .faq-hero__img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.42) contrast(1.06) brightness(0.52);
}

.page-faq .faq-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(180deg, rgba(10, 15, 13, 0.72) 0%, rgba(10, 15, 13, 0.9) 62%, var(--ink-900) 100%),
    repeating-linear-gradient(0deg, rgba(237, 242, 238, 0.055) 0 1px, transparent 1px 6px);
}

.page-faq .faq-hero__body {
  max-width: var(--wrap-max);
  margin: 0 auto;
  padding: calc(var(--header-h) + 40px) 20px 48px;
}

.page-faq .faq-hero__title {
  margin: 14px 0 0;
  font-size: clamp(32px, 8vw, 74px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--cold);
  max-width: 16ch;
}

.page-faq .faq-hero__lede {
  margin: 20px 0 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-70);
}

.page-faq .faq-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-jump__link {
  display: inline-block;
  padding: 8px 14px;
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-pill);
  background: var(--glass);
  color: var(--text-70);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease), background 0.24s var(--ease);
}

.page-faq .faq-jump__link:hover,
.page-faq .faq-jump__link:focus-visible {
  color: var(--cold);
  border-color: var(--signal);
  background: rgba(255, 107, 26, 0.14);
}

/* ---------- 外壳与栅格 ---------- */
.page-faq .faq-shell {
  width: 100%;
  max-width: var(--wrap-max);
  margin: 0 auto;
  padding: 0 20px;
}

.page-faq .faq-body {
  padding: 32px 0 80px;
}

.page-faq .faq-layout {
  display: grid;
  gap: 40px;
  min-width: 0;
}

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

/* ---------- 左侧章节索引 ---------- */
.page-faq .faq-rail {
  display: none;
}

.page-faq .faq-rail__inner {
  position: sticky;
  top: calc(var(--header-h-compact) + 28px);
}

.page-faq .faq-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--steel);
}

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

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

.page-faq .faq-rail__link {
  display: block;
  padding: 9px 0 9px 14px;
  margin-left: -1px;
  border-left: 2px solid transparent;
  color: var(--text-55);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-faq .faq-rail__link:hover {
  color: var(--cold);
}

.page-faq .faq-rail__link[aria-current="true"],
.page-faq .faq-rail__link[aria-current="page"] {
  color: var(--signal);
  border-left-color: var(--signal);
}

.page-faq .faq-rail__shortcuts {
  margin-top: 28px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-faq .faq-rail__shortcut {
  color: var(--text-70);
  font-size: 13px;
  text-decoration: none;
  border-bottom: 1px dashed var(--hair);
  padding-bottom: 6px;
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-faq .faq-rail__shortcut:hover {
  color: var(--cold);
  border-bottom-color: var(--turf);
}

/* ---------- 章节 ---------- */
.page-faq .faq-chapter {
  padding: 48px 0;
  border-top: 1px solid var(--hair);
}

.page-faq .faq-chapter:first-child {
  border-top: 0;
  padding-top: 8px;
}

.page-faq .faq-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 16px;
}

.page-faq .faq-chapter__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(32px, 8vw, 54px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--signal);
}

.page-faq .faq-chapter__title {
  margin: 0;
  font-size: clamp(21px, 4.4vw, 32px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--cold);
}

.page-faq .faq-chapter__intro {
  margin: 0 0 4px;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-70);
}

/* ---------- 步骤条 ---------- */
.page-faq .faq-steps__track {
  display: none;
}

.page-faq .faq-steps {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-faq .faq-step {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 18px 16px 20px;
  background: var(--green-900);
  border: 1px solid var(--hair);
  border-radius: var(--radius);
}

.page-faq .faq-step__node {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--signal);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 15px;
}

.page-faq .faq-step__title {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--cold);
}

.page-faq .faq-step__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-70);
}

/* ---------- 问答条目 ---------- */
.page-faq .faq-item {
  margin-top: 12px;
  background: var(--ink-800);
  border: 1px solid var(--hair);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-faq .faq-item[open] {
  border-color: rgba(255, 107, 26, 0.4);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

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

.page-faq .faq-item__h {
  flex: 1 1 auto;
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--cold);
}

.page-faq .faq-item__caret {
  flex: 0 0 auto;
  display: inline-flex;
  margin-top: 3px;
  color: var(--steel);
  transition: transform 0.24s var(--ease), color 0.24s var(--ease);
}

.page-faq .faq-item[open] .faq-item__caret {
  transform: rotate(180deg);
  color: var(--signal);
}

.page-faq .faq-item__a {
  margin: 0 18px 18px;
  padding-top: 14px;
  border-top: 1px dashed var(--hair);
  color: var(--text-70);
  font-size: 15px;
  line-height: 1.75;
  animation: faq-open 0.24s var(--ease) both;
}

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 64ch;
}

@keyframes faq-open {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 下一步指引 ---------- */
.page-faq .faq-next {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 26px;
  padding: 14px 16px;
  border: 1px solid var(--glass-line);
  border-left: 3px solid var(--signal);
  border-radius: var(--radius-sm);
  background: var(--glass);
  color: var(--cold);
  text-decoration: none;
  transition: background 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-faq .faq-next:hover,
.page-faq .faq-next:focus-visible {
  background: rgba(255, 107, 26, 0.14);
  transform: translateX(4px);
}

.page-faq .faq-next__label {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--text-70);
}

.page-faq .faq-next__text {
  flex: 1 1 auto;
  font-size: 14px;
  line-height: 1.6;
}

.page-faq .faq-next__arrow {
  flex: 0 0 auto;
  color: var(--signal);
  font-size: 18px;
  line-height: 1;
}

/* ---------- 纠错章节两栏 ---------- */
.page-faq .faq-split {
  display: grid;
  gap: 24px;
  min-width: 0;
}

.page-faq .faq-figure {
  margin: 4px 0 0;
}

.page-faq .faq-figure__frame {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--hair);
}

.page-faq .faq-figure__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(0deg, rgba(237, 242, 238, 0.07) 0 1px, transparent 1px 5px);
  pointer-events: none;
}

.page-faq .faq-figure__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.4) contrast(1.05) brightness(0.82);
}

.page-faq .faq-figure__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  line-height: 1.6;
  color: var(--steel);
}

/* ---------- 兜底章节 ---------- */
.page-faq .faq-chapter--help {
  border-top: 1px solid var(--signal);
}

.page-faq .faq-help {
  padding: 24px 20px 26px;
  background: linear-gradient(180deg, rgba(16, 36, 29, 0.9), var(--ink-800));
  border: 1px solid var(--hair);
  border-radius: var(--radius);
}

.page-faq .faq-help__lede {
  margin: 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--cold);
}

.page-faq .faq-help__list {
  margin: 18px 0 22px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-faq .faq-help__list li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-70);
}

.page-faq .faq-help__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--turf);
}

/* ---------- 响应式 ---------- */
@media (min-width: 768px) {
  .page-faq .faq-shell {
    padding: 0 40px;
  }

  .page-faq .faq-hero__body {
    padding: calc(var(--header-h) + 84px) 40px 88px;
  }

  .page-faq .faq-hero__lede {
    font-size: 18px;
  }

  .page-faq .faq-body {
    padding: 48px 0 112px;
  }

  .page-faq .faq-chapter {
    padding: 72px 0;
  }

  .page-faq .faq-item__q {
    padding: 18px 22px;
  }

  .page-faq .faq-item__h {
    font-size: 17px;
  }

  .page-faq .faq-item__a {
    margin: 0 22px 20px;
  }

  .page-faq .faq-help {
    padding: 32px 28px 34px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-steps__track {
    display: block;
    width: 100%;
    height: 8px;
    margin: 34px 0 -18px;
  }

  .page-faq .faq-steps__track line:first-child {
    stroke: var(--turf);
  }

  .page-faq .faq-steps__track line:last-child {
    stroke: var(--signal);
  }

  .page-faq .faq-steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 16px;
    margin-top: 30px;
  }

  .page-faq .faq-split {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 32px;
    align-items: start;
  }

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

@media (min-width: 1040px) {
  .page-faq .faq-layout {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: 56px;
  }

  .page-faq .faq-rail {
    display: block;
  }

  .page-faq .faq-chapter__head {
    gap: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__a {
    animation: none;
  }

  .page-faq .faq-item__caret,
  .page-faq .faq-next,
  .page-faq .faq-rail__link,
  .page-faq .faq-jump__link {
    transition: none;
  }

  .page-faq .faq-next:hover,
  .page-faq .faq-next:focus-visible {
    transform: none;
  }
}

@media print {
  .page-faq {
    background: #ffffff;
    color: #1b1b1b;
  }

  .page-faq .faq-hero__media,
  .page-faq .faq-rail,
  .page-faq .faq-jump,
  .page-faq .faq-next {
    display: none;
  }

  .page-faq .faq-hero__body {
    padding: 0 0 16px;
  }

  .page-faq .faq-hero__title,
  .page-faq .faq-chapter__title,
  .page-faq .faq-step__title,
  .page-faq .faq-item__h {
    color: #1b1b1b;
  }

  .page-faq .faq-chapter__num {
    color: #b34700;
  }

  .page-faq .faq-chapter__intro,
  .page-faq .faq-step__text,
  .page-faq .faq-item__a,
  .page-faq .faq-help__list li {
    color: #3a3a3a;
  }

  .page-faq .faq-step,
  .page-faq .faq-item,
  .page-faq .faq-help {
    background: #ffffff;
    border-color: #cccccc;
  }
}