.page-faq {
  --faq-card-bg: rgba(22, 34, 59, 0.5);
  --faq-border-soft: rgba(255, 255, 255, 0.07);
  --faq-accent-soft: rgba(255, 107, 53, 0.12);
  background: linear-gradient(180deg, #0b1e3a 0%, #0a0a1a 100%);
}

/* ===== Hero 首屏 ===== */
.page-faq__hero {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 520px;
  padding: calc(var(--header-height) + 2.5rem) 0 3rem;
  overflow: hidden;
  background: linear-gradient(180deg, #0b1e3a 0%, #0a0a1a 100%);
  border-bottom: 1px solid var(--color-border);
}

.page-faq__hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
  pointer-events: none;
  z-index: 0;
}

.page-faq__hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(90deg, rgba(11, 30, 58, 0.95) 0%, rgba(11, 30, 58, 0.45) 100%);
  pointer-events: none;
}

.page-faq__hero::after {
  content: "";
  position: absolute;
  right: -10%;
  top: 12%;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle at center, rgba(255, 107, 53, 0.35) 0%, rgba(123, 44, 191, 0.2) 45%, transparent 70%);
  transform: rotate(18deg);
  border-radius: 50%;
  filter: blur(12px);
  z-index: 1;
  pointer-events: none;
}

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

.page-faq__hero-eyebrow {
  margin-bottom: 1.25rem;
}

.page-faq__hero-title {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--color-white);
}

.page-faq__hero-lede {
  margin: 0 0 2rem;
  max-width: 640px;
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-text-secondary);
}

/* ===== 搜索框 ===== */
.page-faq__search {
  position: relative;
  max-width: 640px;
  margin-bottom: 2rem;
}

.page-faq__search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--color-text-secondary);
  pointer-events: none;
}

.page-faq__search-input {
  width: 100%;
  padding: 0.85rem 4.5rem 0.85rem 3rem;
  color: var(--color-white);
  font-family: var(--font-body);
  font-size: 0.95rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.page-faq__search-input::placeholder {
  color: rgba(176, 183, 195, 0.6);
}

.page-faq__search-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--faq-accent-soft);
}

.page-faq__search-kbd {
  position: absolute;
  right: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  padding: 0.2rem 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-text-secondary);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--color-border);
  border-radius: 6px;
}

/* ===== 主体布局 ===== */
.page-faq__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.page-faq__sidebar-title {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.page-faq__cat-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem;
}

.page-faq__cat-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1rem;
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}

.page-faq__cat-link:hover,
.page-faq__cat-link.is-active {
  color: var(--color-white);
  border-color: var(--color-accent);
  background: var(--faq-accent-soft);
}

.page-faq__cat-no {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-accent);
}

.page-faq__side-card {
  padding: 1.5rem;
  background: linear-gradient(135deg, rgba(123, 44, 191, 0.16) 0%, rgba(11, 30, 58, 0.72) 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.page-faq__side-badge {
  margin-bottom: 0.75rem;
}

.page-faq__side-card-title {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-white);
}

.page-faq__side-card-text {
  margin: 0 0 1.25rem;
  font-size: 0.875rem;
  line-height: 1.65;
  color: var(--color-text-secondary);
}

/* ===== 问答分组 ===== */
.page-faq__group {
  margin-bottom: 3rem;
  scroll-margin-top: calc(var(--header-height) + 1.5rem);
}

.page-faq__group-head {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

.page-faq__group-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
  min-width: 44px;
  height: 44px;
  padding: 0 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent);
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.16) 0%, rgba(123, 44, 191, 0.16) 100%);
  border: 1px solid rgba(255, 107, 53, 0.35);
  border-radius: 12px;
}

.page-faq__group-head-text {
  min-width: 0;
}

.page-faq__group-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--color-white);
}

.page-faq__group-sub {
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

/* ===== 手风琴卡片 ===== */
.page-faq__qa {
  display: grid;
  gap: 0.75rem;
}

.page-faq__item {
  background: var(--faq-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

.page-faq__item[open] {
  border-color: rgba(255, 107, 53, 0.45);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.28);
  background: rgba(22, 34, 59, 0.75);
}

.page-faq__question {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-body);
}

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

.page-faq__question:hover {
  background: rgba(255, 255, 255, 0.02);
}

.page-faq__q-icon {
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  color: var(--color-accent);
  background: rgba(255, 255, 255, 0.06);
}

.page-faq__q-icon svg {
  width: 18px;
  height: 18px;
}

.page-faq__q-text {
  flex: 1;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.95rem;
  line-height: 1.45;
  color: var(--color-white);
}

.page-faq__q-plus {
  flex: none;
  position: relative;
  width: 12px;
  height: 12px;
  color: var(--color-text-secondary);
}

.page-faq__q-plus::before,
.page-faq__q-plus::after {
  content: "";
  position: absolute;
  border-radius: 1px;
  background: currentColor;
  transition: transform var(--transition);
}

.page-faq__q-plus::before {
  top: 0;
  left: 5px;
  width: 2px;
  height: 12px;
}

.page-faq__q-plus::after {
  top: 5px;
  left: 0;
  width: 12px;
  height: 2px;
}

.page-faq__item[open] .page-faq__q-plus::before {
  transform: scaleY(0);
}

.page-faq__answer {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  padding: 0 1.25rem 0 4.25rem;
  font-size: 0.925rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  transition: max-height 0.4s ease, padding 0.4s ease, opacity 0.3s ease;
}

.page-faq__item[open] .page-faq__answer {
  max-height: 640px;
  opacity: 1;
  padding: 0 1.25rem 1.25rem 4.25rem;
}

.page-faq__answer p {
  margin: 0 0 0.75rem;
}

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

.page-faq__answer a {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 500;
}

.page-faq__answer a:hover {
  color: var(--color-accent-light);
  text-decoration: underline;
}

/* ===== 设备切换流程 ===== */
.page-faq__flow {
  position: relative;
  padding: 3rem 0 3.5rem;
  overflow: hidden;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: linear-gradient(180deg, rgba(123, 44, 191, 0.06) 0%, rgba(11, 30, 58, 0.4) 100%);
}

.page-faq__flow::before {
  content: "";
  position: absolute;
  right: -12%;
  top: 10%;
  width: 380px;
  height: 380px;
  background: radial-gradient(circle, rgba(123, 44, 191, 0.2) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

.page-faq__flow-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
}

.page-faq__flow-eyebrow {
  margin: 0 0 0.75rem;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.page-faq__flow-title {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 600;
  line-height: 1.25;
  color: var(--color-white);
}

.page-faq__flow-desc {
  margin: 0 0 1.5rem;
  max-width: 500px;
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-text-secondary);
}

.page-faq__steps {
  display: grid;
  gap: 0.85rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.page-faq__step {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.page-faq__step-num {
  flex: none;
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-accent);
}

.page-faq__step-body {
  min-width: 0;
}

.page-faq__step strong {
  display: block;
  margin-bottom: 0.2rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-white);
}

.page-faq__step-text {
  display: block;
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--color-text-secondary);
}

.page-faq__flow-figure {
  margin: 0;
}

.page-faq__flow-img {
  width: 100%;
  height: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

/* ===== 联系渠道 ===== */
.page-faq__contact {
  padding: 0 0 4rem;
}

.page-faq__contact-card {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  padding: 1.75rem 1.5rem;
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.12) 0%, rgba(11, 30, 58, 0.85) 52%, rgba(123, 44, 191, 0.18) 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.page-faq__contact-left {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.page-faq__contact-label {
  margin: 0 0 0.5rem;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.page-faq__contact-title {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-white);
}

.page-faq__contact-desc {
  margin: 0 0 1rem;
  max-width: 520px;
  font-size: 0.925rem;
  line-height: 1.65;
  color: var(--color-text-secondary);
}

.page-faq__contact-items {
  display: grid;
  gap: 0.75rem;
}

.page-faq__contact-item {
  display: flex;
  gap: 0.5rem;
  align-items: baseline;
  padding: 0.65rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.page-faq__contact-type {
  flex: none;
  min-width: 70px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

.page-faq__contact-value {
  font-size: 0.95rem;
  color: var(--color-white);
  word-break: break-all;
}

/* ===== 桌面端增强 ===== */
@media (min-width: 768px) {
  .page-faq__hero {
    min-height: 480px;
  }

  .page-faq__hero-title {
    font-size: 2.75rem;
  }

  .page-faq__layout {
    grid-template-columns: 240px 1fr;
    gap: 2.5rem;
    align-items: start;
  }

  .page-faq__sidebar {
    position: sticky;
    top: calc(var(--header-height) + 1.5rem);
  }

  .page-faq__cat-list {
    display: block;
    margin-bottom: 1.5rem;
  }

  .page-faq__cat-link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: 0.7rem 1rem;
    border-radius: var(--radius);
    margin-bottom: 0.35rem;
  }

  .page-faq__cat-link.is-active {
    background: var(--faq-accent-soft);
    border-color: var(--color-accent);
  }

  .page-faq__flow-grid {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
  }

  .page-faq__contact-card {
    grid-template-columns: 1.1fr 1fr;
    padding: 2.25rem;
  }
}

@media (min-width: 1024px) {
  .page-faq__hero-title {
    font-size: 3.2rem;
  }

  .page-faq__hero-lede {
    font-size: 1.05rem;
  }

  .page-faq__flow {
    padding: 4rem 0 4.5rem;
  }

  .page-faq__flow-grid {
    gap: 4rem;
  }

  .page-faq__flow-title {
    font-size: 2.15rem;
  }
}