.page-faq {
  --faq-index-w: 17rem;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: clamp(1.25rem, 4vw, 2.25rem) clamp(2rem, 5vw, 3.5rem);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -35%;
  left: 16%;
  width: 145%;
  height: 175%;
  pointer-events: none;
  background: linear-gradient(
    104deg,
    transparent 36%,
    rgba(240, 194, 100, 0.20) 48%,
    rgba(217, 164, 65, 0.07) 54%,
    transparent 66%
  );
  animation: faq-beam 600ms var(--ease) both;
}

@keyframes faq-beam {
  from {
    opacity: 0;
    transform: translateX(-8px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.page-faq .faq-hero-grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.75rem);
  align-items: end;
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

@media (min-width: 880px) {
  .page-faq .faq-hero-grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.9fr);
  }
}

.page-faq .faq-hero-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.2em;
  color: var(--cinnabar);
}

.page-faq .faq-hero-title {
  margin: 0.7rem 0 0;
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: clamp(1.95rem, 5.2vw, 3.35rem);
  line-height: 1.2;
  letter-spacing: 0.01em;
  color: var(--ink);
  text-wrap: balance;
}

.page-faq .faq-hero-lede {
  margin: 1.1rem 0 0;
  max-width: 42rem;
  font-size: clamp(0.96rem, 1.6vw, 1.06rem);
  line-height: 1.95;
  color: var(--ink-soft);
}

.page-faq .faq-hero-figure {
  position: relative;
  z-index: 0;
  margin: 0;
}

.page-faq .faq-hero-figure::after {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 10px -10px -10px 10px;
  border: 1px solid var(--rule);
  background: var(--paper-edge);
  pointer-events: none;
}

.page-faq .faq-hero-figure img {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 11 / 7;
  object-fit: cover;
  border: 1px solid var(--rule);
  background: var(--paper-edge);
}

.page-faq .faq-hero-cap {
  margin-top: 0.65rem;
  font-size: 0.78rem;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-layout {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  padding-bottom: clamp(3rem, 8vw, 5.5rem);
}

@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- 左栏索引 ---------- */
.page-faq .faq-index {
  padding-left: 1rem;
  border-left: 1px solid var(--rule);
}

@media (min-width: 960px) {
  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--header-h) + 1.25rem);
    max-height: calc(100vh - var(--header-h) - 3rem);
    overflow-y: auto;
    padding-right: 0.6rem;
    scrollbar-width: thin;
  }
}

.page-faq .faq-index-title {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  color: var(--ink-soft);
}

.page-faq .faq-index-block + .faq-index-block {
  margin-top: 1.1rem;
}

.page-faq .faq-index-head {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  margin: 0 0 0.35rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink);
}

.page-faq .faq-index-head .num {
  color: var(--cinnabar);
}

.page-faq .faq-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.05rem;
}

.page-faq .faq-index-list .rail-link {
  display: block;
  padding: 0.3rem 0 0.3rem 0.7rem;
  border-left: 2px solid transparent;
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--ink-soft);
  text-decoration: none;
  transition: color var(--fast) var(--ease), border-color var(--fast) var(--ease);
}

.page-faq .faq-index-list .rail-link:hover {
  color: var(--cinnabar);
}

.page-faq .faq-index-list .rail-link[aria-current="true"] {
  color: var(--cinnabar);
  border-left-color: var(--cinnabar);
}

/* ---------- 分组 ---------- */
.page-faq .faq-group + .faq-group {
  margin-top: clamp(2.25rem, 5vw, 3.5rem);
}

.page-faq .faq-group-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 0.3rem 0.85rem;
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--ink-soft);
}

.page-faq .faq-group-num {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  color: var(--cinnabar);
}

.page-faq .faq-group-title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(1.3rem, 3vw, 1.72rem);
  line-height: 1.3;
  color: var(--ink);
}

.page-faq .faq-group-sub {
  grid-column: 2;
  margin: 0.4rem 0 0;
  font-size: 0.85rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---------- 版块插图 ---------- */
.page-faq .faq-figure {
  margin: clamp(1.2rem, 3vw, 1.8rem) 0 0;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--rule);
  background: var(--paper-edge);
}

.page-faq .faq-figure-cap {
  margin-top: 0.6rem;
  font-size: 0.77rem;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ---------- 问答条目 ---------- */
.page-faq .faq-item {
  border-bottom: 1px solid var(--rule);
  scroll-margin-top: calc(var(--header-h) + 1.5rem);
}

.page-faq .faq-q {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}

.page-faq .faq-btn {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: start;
  gap: 0 0.85rem;
  width: 100%;
  padding: 1.05rem 0;
  background: none;
  border: 0;
  border-radius: 2px;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.page-faq .faq-btn:focus-visible {
  outline: 2px solid var(--cinnabar);
  outline-offset: 3px;
}

.page-faq .faq-q-num {
  padding-top: 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--cinnabar);
}

.page-faq .faq-q-text {
  font-family: var(--font-serif);
  font-size: clamp(1rem, 2.1vw, 1.1rem);
  font-weight: 400;
  line-height: 1.62;
  color: var(--ink);
  text-wrap: pretty;
  transition: color var(--fast) var(--ease);
}

.page-faq .faq-btn:hover .faq-q-text,
.page-faq .faq-btn[aria-expanded="true"] .faq-q-text {
  color: var(--cinnabar);
}

/* 门框形开合图标 */
.page-faq .faq-icon {
  position: relative;
  flex: none;
  width: 1rem;
  height: 1.15rem;
  margin-top: 0.34rem;
}

.page-faq .faq-icon::before {
  content: "";
  position: absolute;
  inset: 0;
  border: 1.5px solid var(--ink-soft);
  border-bottom: 0;
  border-radius: 3px 3px 0 0;
  transition: border-color var(--fast) var(--ease);
}

.page-faq .faq-icon::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 2px;
  bottom: 2px;
  width: 1.5px;
  margin-left: -0.75px;
  background: var(--ink-soft);
  transition: transform var(--dur) var(--ease), background-color var(--fast) var(--ease);
}

.page-faq .faq-btn[aria-expanded="true"] .faq-icon::before {
  border-color: var(--cinnabar);
}

.page-faq .faq-btn[aria-expanded="true"] .faq-icon::after {
  background: var(--cinnabar);
  transform: rotate(90deg);
}

/* ---------- 答案面板 ---------- */
.page-faq .faq-panel[hidden] {
  display: none;
}

.page-faq .faq-panel:not([hidden]) {
  animation: faq-open 260ms var(--ease) both;
}

@keyframes faq-open {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-faq .faq-panel-inner {
  display: grid;
  gap: 0.9rem;
  padding: 0 0 1.35rem;
}

@media (min-width: 640px) {
  .page-faq .faq-panel-inner {
    grid-template-columns: minmax(0, 1fr) 11.5rem;
    gap: 1.5rem;
    padding-left: 2.3rem;
  }
}

.page-faq .faq-answer {
  max-width: 44rem;
}

.page-faq .faq-answer p {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.95;
  color: var(--ink-soft);
}

.page-faq .faq-side {
  display: grid;
  align-content: start;
  gap: 0.4rem;
  padding-left: 0.85rem;
  border-left: 1px solid var(--rule);
}

.page-faq .faq-side-key {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  color: var(--ink-soft);
}

.page-faq .faq-side-link {
  display: inline-block;
  padding-bottom: 1px;
  font-size: 0.82rem;
  line-height: 1.65;
  color: var(--cinnabar);
  text-decoration: none;
  border-bottom: 1px solid rgba(180, 69, 46, 0.36);
  transition: color var(--fast) var(--ease), border-color var(--fast) var(--ease);
}

.page-faq .faq-side-link:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* ---------- 结尾提示 ---------- */
.page-faq .faq-endnote {
  margin-top: clamp(2.5rem, 6vw, 4rem);
  padding: clamp(1.35rem, 4vw, 2rem);
  background: var(--paper-edge);
  border: 1px solid var(--rule);
  display: grid;
  gap: 1.1rem;
}

@media (min-width: 760px) {
  .page-faq .faq-endnote {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 2.25rem;
  }
}

.page-faq .faq-endnote-text {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.9;
  color: var(--ink);
}

.page-faq .faq-endnote-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-hero::before,
  .page-faq .faq-panel:not([hidden]) {
    animation: none;
  }

  .page-faq .faq-icon::after,
  .page-faq .faq-q-text {
    transition: none;
  }
}