.page-faq {
  --faq-answer: #c6d1e3;
  --faq-gap: clamp(20px, 3.2vw, 40px);
  background: var(--ink);
  color: var(--paper);
  padding-bottom: clamp(56px, 8vw, 112px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  padding: clamp(26px, 4.5vw, 52px) 0 clamp(32px, 5.5vw, 68px);
}

.page-faq .faq-hero-art {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.3;
}

.page-faq .faq-hero-art img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: none;
  object-fit: cover;
  object-position: center;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(180deg, rgba(10, 20, 36, 0.66) 0%, rgba(10, 20, 36, 0.92) 68%, var(--ink) 100%);
  pointer-events: none;
}

.page-faq .faq-hero-body {
  position: relative;
  z-index: 2;
}

.page-faq .faq-hero-body .crumbs {
  margin-bottom: clamp(20px, 3.5vw, 34px);
}

.page-faq .faq-hero h1 {
  margin: 0;
  max-width: 20ch;
  font-size: clamp(2rem, 5.6vw, 4.2rem);
  font-weight: 300;
  line-height: 1.14;
  letter-spacing: -0.02em;
  transform: rotate(var(--tilt));
  transform-origin: left bottom;
}

.page-faq .faq-lead {
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  max-width: 58ch;
  font-size: var(--step-3);
  line-height: 1.75;
  color: var(--faq-answer);
}

.page-faq .faq-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px clamp(20px, 4vw, 56px);
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: clamp(14px, 2vw, 20px) 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.page-faq .faq-hero-meta li {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-faq .faq-meta-num {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--score);
  line-height: 1;
}

.page-faq .faq-meta-label {
  font-size: var(--step-1);
  letter-spacing: 0.18em;
  color: var(--muted);
}

/* ---------- 两栏主体 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
  padding-top: clamp(32px, 5vw, 64px);
}

/* 左栏：分类索引 */
.page-faq .faq-index-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-index-list a {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  color: var(--paper);
  font-size: var(--step-2);
  text-decoration: none;
  transition: border-color 0.24s var(--ease), color 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-faq .faq-index-num {
  font-family: var(--font-mono);
  font-size: var(--step-1);
  font-weight: 700;
  color: var(--score);
  letter-spacing: 0.04em;
}

.page-faq .faq-index-list a:hover,
.page-faq .faq-index-list a:focus-visible {
  border-color: var(--lake);
  color: var(--lake);
  transform: translateX(2px);
}

.page-faq .faq-index-list a:focus-visible {
  outline: 2px solid var(--lake);
  outline-offset: 2px;
}

/* 右栏：问答流 */
.page-faq .faq-stream {
  min-width: 0;
}

.page-faq .faq-group + .faq-group,
.page-faq .faq-group + .faq-outro {
  margin-top: clamp(34px, 5vw, 60px);
}

.page-faq .faq-group-head {
  display: flex;
  align-items: baseline;
  gap: clamp(12px, 2vw, 22px);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-group-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.4vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--pitch);
  transform: rotate(var(--tilt));
}

.page-faq .faq-group-head h2 {
  margin: 0;
  font-size: clamp(1.35rem, 2.6vw, 2rem);
  font-weight: 300;
  letter-spacing: -0.01em;
}

/* 折叠条目 */
.page-faq .faq-item {
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-item summary {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  min-height: 44px;
  padding: 18px 0;
  font-size: var(--step-3);
  font-weight: 400;
  line-height: 1.55;
  color: var(--paper);
  cursor: pointer;
  list-style: none;
  transition: color 0.22s var(--ease);
}

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

.page-faq .faq-item summary:hover,
.page-faq .faq-item summary:focus-visible {
  color: var(--lake);
}

.page-faq .faq-item summary:focus-visible {
  outline: 2px solid var(--lake);
  outline-offset: 4px;
}

.page-faq .faq-item summary::after {
  content: "";
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  margin-top: 9px;
  border-right: 1px solid var(--score);
  border-bottom: 1px solid var(--score);
  transform: rotate(45deg);
  transition: transform 0.28s var(--ease);
}

.page-faq .faq-item[open] summary::after {
  transform: rotate(-135deg);
}

.page-faq .faq-answer {
  padding: 0 0 22px;
  max-width: 68ch;
}

.page-faq .faq-answer p {
  margin: 0;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--faq-answer);
}

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

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

/* 纠错章节配图 */
.page-faq .faq-media {
  margin: clamp(22px, 3vw, 34px) 0 0;
}

/* ---------- 收尾引导 ---------- */
.page-faq .faq-outro {
  position: relative;
  margin-top: clamp(38px, 6vw, 72px);
  padding: clamp(26px, 4vw, 44px) clamp(20px, 3.5vw, 40px) clamp(28px, 4vw, 44px);
  background: var(--ink-2);
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-faq .faq-outro-band {
  position: absolute;
  top: 0;
  left: 0;
  width: 96px;
  height: 3px;
  background: linear-gradient(90deg, var(--score) 0%, var(--pitch) 60%, var(--lake) 100%);
}

.page-faq .faq-outro h2 {
  margin: 0;
  font-size: clamp(1.4rem, 3vw, 2.1rem);
  font-weight: 300;
  letter-spacing: -0.01em;
}

.page-faq .faq-outro > p {
  margin: 14px 0 0;
  max-width: 60ch;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--faq-answer);
}

.page-faq .faq-outro-contact {
  display: flex;
  flex-wrap: wrap;
  gap: 12px clamp(24px, 4vw, 56px);
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: clamp(16px, 2.4vw, 22px) 0 0;
  border-top: 1px solid var(--line);
}

.page-faq .faq-outro-contact dt {
  font-size: var(--step-1);
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-faq .faq-outro-contact dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: var(--step-3);
  font-weight: 700;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.page-faq .faq-outro-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-body {
    grid-template-columns: minmax(196px, 244px) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 76px);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 88px;
  }

  .page-faq .faq-index-list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
    margin-top: 18px;
  }

  .page-faq .faq-index-list li {
    border-bottom: 1px solid var(--line);
  }

  .page-faq .faq-index-list li:last-child {
    border-bottom: 0;
  }

  .page-faq .faq-index-list a {
    justify-content: flex-start;
    width: 100%;
    padding: 12px 0;
    border: 0;
  }

  .page-faq .faq-index-list a:hover,
  .page-faq .faq-index-list a:focus-visible {
    border: 0;
  }
}

@media (max-width: 640px) {
  .page-faq .faq-hero h1 {
    max-width: none;
    transform: none;
  }

  .page-faq .faq-group-num {
    font-size: 1.4rem;
    transform: none;
  }

  .page-faq .faq-item summary {
    font-size: 1.0625rem;
  }

  .page-faq .faq-outro {
    padding-left: 18px;
    padding-right: 18px;
  }

  .page-faq .faq-outro-actions .btn {
    width: 100%;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item summary,
  .page-faq .faq-item summary::after,
  .page-faq .faq-index-list a {
    transition: none;
  }

  .page-faq .faq-index-list a:hover,
  .page-faq .faq-index-list a:focus-visible {
    transform: none;
  }

  .page-faq .faq-hero h1,
  .page-faq .faq-group-num {
    transform: none;
  }
}