.page-faq {
  --faq-index-w: 250px;
  background: var(--color-bg);
  color: var(--color-text);
}

/* ========== Hero ========== */
.page-faq__hero {
  position: relative;
  padding: calc(var(--header-total) + clamp(2rem, 6vw, 4.5rem)) 0 clamp(2.75rem, 6vw, 4rem);
  background:
    radial-gradient(ellipse at 78% 18%, rgba(255, 122, 61, 0.14), transparent 42%),
    radial-gradient(ellipse at 22% 82%, rgba(127, 209, 255, 0.1), transparent 46%),
    var(--color-bg);
  overflow: hidden;
}

.page-faq__hero::before {
  content: "";
  position: absolute;
  top: 12%;
  right: 8%;
  width: 240px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-glacier), transparent);
  transform: rotate(-18deg);
  transform-origin: right center;
  opacity: 0.5;
  pointer-events: none;
}

.page-faq__hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  max-width: none;
  object-fit: cover;
  opacity: 0.12;
  pointer-events: none;
}

.page-faq__hero > .container {
  position: relative;
  z-index: 2;
}

.page-faq__eyebrow {
  margin: 1.5rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.page-faq__title {
  margin: 0.85rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 5vw, 4rem);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: 0.02em;
}

.page-faq__lead {
  margin: 1.2rem 0 0;
  max-width: 62ch;
  color: var(--color-silver);
  font-size: clamp(0.98rem, 1.4vw, 1.15rem);
  line-height: 1.8;
}

.page-faq__hero-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.4rem;
}

.page-faq__hero-note {
  color: var(--color-silver);
  font-size: 0.88rem;
  border-left: 1px solid rgba(192, 199, 217, 0.3);
  padding-left: 0.8rem;
  line-height: 1.4;
}

/* ========== FAQ 分类双栏 ========== */
.page-faq__hidden-heading {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.page-faq__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.page-faq__questions {
  min-width: 0;
}

.page-faq__index {
  padding: 1.2rem 1.2rem 1rem;
  background: rgba(19, 27, 60, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.07);
}

.page-faq__index-label {
  margin: 0 0 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-glacier);
}

.page-faq__index-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.page-faq__index-link {
  display: inline-block;
  padding: 0.5rem 0.85rem;
  border: 1px solid rgba(192, 199, 217, 0.18);
  background: rgba(19, 27, 60, 0.5);
  color: var(--color-silver);
  font-size: 0.88rem;
  text-decoration: none;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}

.page-faq__index-link:hover,
.page-faq__index-link:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-text);
  background: rgba(255, 122, 61, 0.06);
}

/* ========== FAQ 分类组 ========== */
.page-faq__category-group {
  scroll-margin-top: calc(var(--header-total) + 0.75rem);
}

.page-faq__category-group + .page-faq__category-group {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px dashed rgba(192, 199, 217, 0.16);
}

.page-faq__category-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.page-faq__category-title::before {
  content: "";
  width: 18px;
  height: 2px;
  background: var(--color-accent);
  box-shadow: 0 0 8px rgba(255, 122, 61, 0.55);
  flex: 0 0 auto;
}

.page-faq__category-desc {
  margin: 0.4rem 0 0.75rem;
  padding-left: 1.6rem;
  color: var(--color-silver);
  font-size: 0.85rem;
  line-height: 1.6;
}

/* ========== FAQ 条目 ========== */
.page-faq__faq-item {
  border-bottom: 1px solid rgba(192, 199, 217, 0.12);
  transition: background 0.2s;
}

.page-faq__faq-item:last-child {
  border-bottom: none;
}

.page-faq__faq-item:hover,
.page-faq__faq-item[open] {
  background: rgba(19, 27, 60, 0.35);
}

.page-faq__faq-question {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  list-style: none;
  padding: 1.05rem 0.5rem;
  cursor: pointer;
  user-select: none;
}

.page-faq__faq-question::-webkit-details-marker {
  display: none;
}

.page-faq__faq-question::marker {
  content: none;
}

.page-faq__faq-num {
  flex: 0 0 auto;
  width: 1.85rem;
  height: 1.85rem;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--color-accent);
  box-shadow: 0 0 12px rgba(255, 122, 61, 0.45);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--color-bg);
}

.page-faq__faq-text {
  flex: 1;
  font-size: 0.95rem;
  font-weight: 500;
  line-height: 1.5;
  color: var(--color-text);
}

.page-faq__faq-toggle {
  flex: 0 0 auto;
  width: 0.8rem;
  height: 0.8rem;
  border-right: 2px solid rgba(192, 199, 217, 0.6);
  border-bottom: 2px solid rgba(192, 199, 217, 0.6);
  transform: rotate(45deg);
  transition: transform 0.25s ease, border-color 0.2s;
  margin-right: 0.35rem;
}

.page-faq__faq-item[open] .page-faq__faq-toggle {
  transform: rotate(225deg);
  border-color: var(--color-accent);
}

.page-faq__faq-answer {
  padding: 0 0.5rem 1.2rem calc(0.5rem + 1.85rem + 0.85rem);
  color: var(--color-silver);
  font-size: 0.9rem;
  line-height: 1.8;
}

.page-faq__faq-answer p {
  margin: 0 0 0.6rem;
}

.page-faq__faq-answer p:last-child {
  margin-bottom: 0;
}

.page-faq__faq-answer a,
.page-faq .section-lead a {
  color: var(--color-glacier);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s;
}

.page-faq__faq-answer a:hover,
.page-faq .section-lead a:hover {
  color: var(--color-accent);
}

/* ========== 帮助反馈 ========== */
.page-faq__helpful {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1rem;
  padding-top: 0.9rem;
  border-top: 1px dashed rgba(192, 199, 217, 0.12);
}

.page-faq__helpful-label {
  font-size: 0.8rem;
  color: var(--color-silver);
}

.page-faq__helpful-link {
  font-size: 0.82rem;
  color: var(--color-glacier);
  text-decoration: none;
  border: 1px solid rgba(127, 209, 255, 0.35);
  padding: 0.3rem 0.75rem;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}

.page-faq__helpful-link:hover,
.page-faq__helpful-link:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: rgba(255, 122, 61, 0.08);
}

/* ========== 通用区块头部 ========== */
.page-faq__section-head {
  margin-bottom: 2rem;
}

.page-faq__section-kicker {
  margin: 0 0 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.page-faq__section-kicker::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--color-accent);
  opacity: 0.8;
}

/* ========== 数据更新与准确性 ========== */
.page-faq__update {
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, var(--color-bg) 0%, rgba(19, 27, 60, 0.45) 100%);
}

.page-faq__update::before {
  content: "";
  position: absolute;
  right: -12%;
  top: 10%;
  width: 55%;
  height: 130%;
  border: 1px solid rgba(127, 209, 255, 0.09);
  border-radius: 50%;
  transform: rotate(-18deg);
  pointer-events: none;
}

.page-faq__update > .container {
  position: relative;
  z-index: 1;
}

.page-faq__update-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-faq__update-item {
  position: relative;
  padding: 1.6rem 1.35rem 1.4rem;
  background: rgba(19, 27, 60, 0.55);
  border: 1px solid rgba(255, 255, 255, 0.08);
  overflow: hidden;
}

.page-faq__update-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent) 0%, rgba(255, 122, 61, 0) 100%);
}

.page-faq .page-faq__update-num {
  display: block;
  font-size: clamp(1.6rem, 2.5vw, 2.1rem);
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.page-faq__update-label {
  margin: 0.6rem 0 0.35rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
}

.page-faq__update-desc {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.65;
  color: var(--color-silver);
}

/* ========== 收藏功能使用 ========== */
.page-faq__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-faq__step {
  position: relative;
  padding: 2rem 1.5rem 1.5rem;
  background: rgba(19, 27, 60, 0.4);
  border: 1px solid rgba(192, 199, 217, 0.14);
}

.page-faq__step::after {
  content: "";
  position: absolute;
  right: -1.1rem;
  top: 50%;
  width: 0.85rem;
  height: 0.85rem;
  border-top: 2px solid rgba(255, 122, 61, 0.7);
  border-right: 2px solid rgba(255, 122, 61, 0.7);
  transform: rotate(45deg);
  display: none;
  pointer-events: none;
}

.page-faq__step-num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--color-accent);
}

.page-faq__step-title {
  margin: 0.7rem 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--color-text);
}

.page-faq__step-desc {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.7;
  color: var(--color-silver);
}

/* ========== 联系与反馈 ========== */
.page-faq__contact {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 85% 30%, rgba(255, 122, 61, 0.12), transparent 55%),
    radial-gradient(ellipse at 15% 80%, rgba(127, 209, 255, 0.07), transparent 45%),
    var(--color-bg);
  border-top: 1px solid rgba(192, 199, 217, 0.1);
}

.page-faq__contact::before {
  content: "";
  position: absolute;
  left: -8%;
  bottom: -20%;
  width: 50%;
  height: 100%;
  border: 1px solid rgba(255, 122, 61, 0.1);
  border-radius: 50%;
  transform: rotate(12deg);
  pointer-events: none;
}

.page-faq__contact > .container {
  position: relative;
  z-index: 1;
}

.page-faq__contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
}

.page-faq__contact-list {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0;
}

.page-faq__contact-row {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 0.75rem;
  padding: 0.85rem 0;
  border-bottom: 1px dashed rgba(192, 199, 217, 0.14);
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--color-text);
  word-break: break-word;
}

.page-faq__contact-row:first-child {
  border-top: 1px solid rgba(192, 199, 217, 0.22);
}

.page-faq__contact-label {
  color: var(--color-silver);
  font-size: 0.85rem;
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
}

.page-faq__contact-label::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  box-shadow: 0 0 8px rgba(255, 122, 61, 0.6);
  border-radius: 50%;
  transform: translateY(-1px);
  flex: 0 0 auto;
}

.page-faq__contact-note {
  margin: 1.2rem 0 1.4rem;
  font-size: 0.82rem;
  color: var(--color-silver);
  line-height: 1.7;
  border-left: 2px solid rgba(127, 209, 255, 0.35);
  padding-left: 0.85rem;
}

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

.page-faq__contact-visual {
  display: flex;
  justify-content: center;
}

.page-faq__contact-img {
  width: 100%;
  max-width: 300px;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: var(--color-nebula);
}

/* ========== 桌面断点（移动端优先） ========== */
@media (min-width: 640px) {
  .page-faq__update-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 720px) {
  .page-faq__steps {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.75rem;
  }

  .page-faq__step:not(:last-child)::after {
    display: block;
  }
}

@media (min-width: 860px) {
  .page-faq__contact-grid {
    grid-template-columns: 1fr 300px;
    gap: clamp(2.5rem, 6vw, 5rem);
  }
}

@media (min-width: 880px) {
  .page-faq__layout {
    grid-template-columns: var(--faq-index-w) 1fr;
    gap: clamp(2.5rem, 6vw, 4.5rem);
    align-items: start;
  }

  .page-faq__index {
    position: sticky;
    top: calc(var(--header-total) + 1.25rem);
    padding: 0;
    background: transparent;
    border: none;
  }

  .page-faq__index-nav {
    flex-direction: column;
    gap: 0;
  }

  .page-faq__index-link {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.62rem 0.75rem;
    border: none;
    border-left: 2px solid rgba(192, 199, 217, 0.22);
    font-size: 0.92rem;
    background: transparent;
  }

  .page-faq__index-link::before {
    content: "";
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: rgba(192, 199, 217, 0.5);
    transition: background 0.2s, box-shadow 0.2s;
    flex: 0 0 auto;
  }

  .page-faq__index-link:hover,
  .page-faq__index-link:focus-visible {
    background: transparent;
    border-left-color: var(--color-accent);
    color: var(--color-text);
  }

  .page-faq__index-link:hover::before,
  .page-faq__index-link:focus-visible::before {
    background: var(--color-accent);
    box-shadow: 0 0 8px rgba(255, 122, 61, 0.8);
  }
}

@media (min-width: 960px) {
  .page-faq__update-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}