.page-faq {
  background: var(--bg-deep);
  color: var(--ink);
  position: relative;
}

.page-faq h1,
.page-faq h2 {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  margin: 0;
  text-transform: uppercase;
}

.page-faq h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  line-height: 1.05;
  max-width: 11em;
}

.page-faq h2 {
  font-size: clamp(1.5rem, 2.6vw, 2.2rem);
  line-height: 1.15;
}

/* ===== Hero 首屏 ===== */
.page-faq__hero {
  padding: 2rem 0 3.5rem;
  position: relative;
  overflow: hidden;
}

.page-faq__hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: -18%;
  width: 46%;
  height: 100%;
  background: linear-gradient(120deg, transparent 0%, rgba(139, 92, 246, 0.14) 46%, rgba(57, 255, 136, 0.07) 100%);
  transform: skewX(-8deg);
  pointer-events: none;
}

.page-faq__hero-grid {
  display: grid;
  gap: 2rem;
  align-items: center;
}

.page-faq__hero-copy {
  position: relative;
  z-index: 1;
}

.page-faq__lead {
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--ink-dim);
  margin: 1rem 0 0;
  max-width: 34rem;
}

.page-faq__hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 1.5rem;
}

.page-faq__hero-media {
  position: relative;
}

.page-faq__hero-media img,
.page-faq__contact-media img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-faq__hero-media::before {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: 26px;
  height: 26px;
  background: var(--purple);
  clip-path: polygon(0 0, 100% 0, 0 100%);
  opacity: 0.8;
}

.page-faq__hero-media::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: -1px;
  width: 20px;
  height: 20px;
  background: var(--green);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
  opacity: 0.55;
}

/* ===== 常见问题主区 ===== */
.page-faq__main {
  padding: 1rem 0 4.5rem;
}

.page-faq__head {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.75rem;
}

.page-faq__head-note {
  max-width: 30rem;
  color: var(--ink-faint);
  font-family: var(--font-body);
  font-size: 0.9rem;
  line-height: 1.7;
  margin: 0;
}

.page-faq__shell {
  display: grid;
  gap: 2rem;
}

/* ===== 左侧索引 ===== */
.page-faq__index {
  padding: 1.25rem;
  background: var(--bg-panel);
  border: 1px solid var(--line);
}

.page-faq__index-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: var(--purple);
  text-transform: uppercase;
  margin: 0 0 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--line);
}

.page-faq__index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: nowrap;
  gap: 0.75rem 1rem;
  overflow-x: auto;
  padding: 0.25rem 0.1rem 0.5rem;
  scrollbar-width: thin;
  scrollbar-color: var(--purple) var(--line);
}

.page-faq__index-list li {
  flex: 0 0 auto;
  border-bottom: 1px solid var(--line);
  margin: 0;
}

.page-faq__index-list a {
  display: flex;
  gap: 0.7rem;
  align-items: baseline;
  padding: 0.45rem 0;
  color: var(--ink-dim);
  text-decoration: none;
  white-space: nowrap;
  font-family: var(--font-body);
  font-size: 0.88rem;
  transition: color 0.35s var(--ease-out), padding-left 0.35s var(--ease-out);
}

.page-faq__index-list a:hover {
  color: var(--green);
  padding-left: 0.25rem;
}

.page-faq__index-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--purple);
  letter-spacing: 0.04em;
}

/* ===== 标签过滤 ===== */
.page-faq__filter-group {
  min-width: 0;
}

.page-faq__filter-group-head {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-bottom: 1rem;
}

.page-faq__filter-group-label {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  color: var(--green);
  margin: 0;
  text-transform: uppercase;
}

.page-faq__filter-group-tip {
  font-size: 0.75rem;
  color: var(--ink-faint);
  margin: 0;
}

.page-faq__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
  white-space: nowrap;
}

.page-faq__filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.page-faq__filter-label {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--line);
  color: var(--ink-dim);
  background: var(--bg-panel);
  cursor: pointer;
  transition: all 0.35s var(--ease-out);
}

.page-faq__filter-label:hover {
  border-color: var(--purple);
  color: var(--ink);
}

.page-faq #faq-filter-all:checked ~ .page-faq__filter-bar label[for="faq-filter-all"],
.page-faq #faq-filter-play:checked ~ .page-faq__filter-bar label[for="faq-filter-play"],
.page-faq #faq-filter-quality:checked ~ .page-faq__filter-bar label[for="faq-filter-quality"],
.page-faq #faq-filter-download:checked ~ .page-faq__filter-bar label[for="faq-filter-download"],
.page-faq #faq-filter-crowd:checked ~ .page-faq__filter-bar label[for="faq-filter-crowd"],
.page-faq #faq-filter-account:checked ~ .page-faq__filter-bar label[for="faq-filter-account"] {
  background: var(--green);
  border-color: var(--green);
  color: #05120a;
  font-weight: 700;
}

.page-faq #faq-filter-play:checked ~ .page-faq__list .page-faq__item:not(.cat-play),
.page-faq #faq-filter-quality:checked ~ .page-faq__list .page-faq__item:not(.cat-quality),
.page-faq #faq-filter-download:checked ~ .page-faq__list .page-faq__item:not(.cat-download),
.page-faq #faq-filter-crowd:checked ~ .page-faq__list .page-faq__item:not(.cat-crowd),
.page-faq #faq-filter-account:checked ~ .page-faq__list .page-faq__item:not(.cat-account) {
  display: none;
}

/* ===== 手风琴条目 ===== */
.page-faq__list {
  min-width: 0;
}

.page-faq__item {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  margin-bottom: 0.85rem;
  position: relative;
  transition: border-color 0.35s var(--ease-out), background 0.35s var(--ease-out);
}

.page-faq__item[open] {
  border-color: var(--purple);
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.08), rgba(18, 20, 26, 0.98) 38%);
}

.page-faq__item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.1rem 1.25rem;
  margin: 0;
}

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

.page-faq__item summary::before {
  content: "";
  width: 0;
  height: 0;
  border-left: 13px solid transparent;
  border-bottom: 18px solid var(--purple);
  filter: drop-shadow(0 0 6px rgba(139, 92, 246, 0.4));
  flex-shrink: 0;
  align-self: flex-start;
  margin-top: 0.35rem;
}

.page-faq__item summary:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: -2px;
}

.page-faq__num {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--purple);
  flex-shrink: 0;
}

.page-faq__q {
  flex: 1;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.4;
  color: var(--ink);
}

.page-faq__item summary::after {
  content: "";
  width: 0;
  height: 0;
  border-left: 7px solid transparent;
  border-right: 7px solid transparent;
  border-top: 9px solid var(--ink-dim);
  flex-shrink: 0;
  transition: transform 0.35s var(--ease-out), border-top-color 0.35s var(--ease-out);
}

.page-faq__item[open] summary::after {
  transform: rotate(180deg);
  border-top-color: var(--green);
}

.page-faq__a {
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--line);
  margin: 0.25rem 1.25rem 1.25rem;
}

.page-faq__a p {
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--ink-dim);
  margin: 0;
}

.page-faq__a a {
  color: var(--green);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.page-faq__item[open] .page-faq__a {
  animation: pageFaqReveal 0.35s var(--ease-out) both;
}

.page-faq__tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.85rem;
}

.page-faq__tag-row .tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1;
  padding: 0.35rem 0.6rem;
  background: var(--bg-raise);
  color: var(--ink-dim);
  border: 1px solid var(--line);
}

/* ===== 联系支持区 ===== */
.page-faq__contact {
  background: var(--bg-panel);
  position: relative;
  overflow: hidden;
  padding: 2.75rem 0 3.25rem;
}

.page-faq__contact::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--green), var(--purple), var(--orange));
  opacity: 0.85;
}

.page-faq__contact-grid {
  display: grid;
  gap: 2rem;
  align-items: center;
}

.page-faq__contact-copy p {
  font-family: var(--font-body);
  font-size: 0.98rem;
  line-height: 1.75;
  color: var(--ink-dim);
  margin: 0.75rem 0 1rem;
  max-width: 36rem;
}

.page-faq__contact-copy .eyebrow {
  margin-top: 0;
}

.page-faq__contact-copy .btn {
  margin-top: 0.5rem;
}

.page-faq__contact-copy a {
  color: var(--green);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.page-faq__contact-media {
  position: relative;
}

.page-faq__contact-media::before {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: 22px;
  height: 22px;
  background: var(--orange);
  clip-path: polygon(0 0, 100% 0, 0 100%);
  opacity: 0.75;
}

/* ===== 桌面端增强 ===== */
@media (min-width: 900px) {
  .page-faq__hero {
    padding: 2.5rem 0 4.5rem;
  }

  .page-faq__hero-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 3rem;
  }

  .page-faq__head {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
  }

  .page-faq__shell {
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 3rem;
    align-items: start;
  }

  .page-faq__index {
    position: sticky;
    top: 2rem;
    align-self: start;
  }

  .page-faq__index-list {
    display: block;
    overflow: visible;
    padding: 0;
  }

  .page-faq__index-list li {
    display: block;
    border-bottom: none;
    margin: 0;
  }

  .page-faq__index-list a {
    padding: 0.55rem 0;
    white-space: normal;
    border-bottom: 1px solid var(--line);
  }

  .page-faq__filter-group-head {
    flex-direction: row;
    justify-content: space-between;
    align-items: baseline;
  }

  .page-faq__contact-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 3.5rem;
  }

  .page-faq__contact {
    padding: 3.5rem 0 4rem;
  }
}