.page-faq {
  --faq-sidebar-w: 280px;
  --faq-hero-bg: linear-gradient(150deg, var(--color-primary-deep) 0%, var(--color-primary) 55%, var(--color-indigo) 135%);
  background: var(--color-bg);
  color: var(--color-text-dark);
}

/* ========== 首屏 ========== */
.page-faq__hero {
  position: relative;
  overflow: hidden;
  padding: var(--space-xl) 0 var(--space-2xl);
  background: var(--faq-hero-bg);
  color: var(--color-primary-foreground);
}

.page-faq__hero::before {
  content: "";
  position: absolute;
  right: -70px;
  top: 28%;
  width: 260px;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(212, 175, 55, 0.6), transparent);
  transform: rotate(-38deg);
  transform-origin: right center;
}

.page-faq__hero::after {
  content: "";
  position: absolute;
  left: 12%;
  bottom: -70px;
  width: 360px;
  height: 220px;
  background: radial-gradient(ellipse closest-side, rgba(212, 175, 55, 0.16), transparent);
  pointer-events: none;
}

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

.page-faq__hero .breadcrumbs {
  margin-bottom: var(--space-lg);
  color: rgba(245, 244, 240, 0.72);
}

.page-faq__hero .breadcrumbs a {
  color: var(--color-gold-light);
  text-decoration-color: rgba(212, 175, 55, 0.4);
}

.page-faq__hero .breadcrumbs [aria-current="page"] {
  color: rgba(245, 244, 240, 0.92);
}

.page-faq__title {
  margin: 0 0 var(--space-md);
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  line-height: 1.18;
  letter-spacing: -0.01em;
  max-width: 14em;
}

.page-faq__title::after {
  content: "";
  display: block;
  width: 76px;
  height: 4px;
  margin-top: var(--space-md);
  background: linear-gradient(90deg, var(--color-gold), rgba(212, 175, 55, 0.15));
  border-radius: 2px;
}

.page-faq__lead {
  margin: 0;
  max-width: 62ch;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.85;
  color: rgba(245, 244, 240, 0.84);
}

.page-faq__hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

.page-faq__iso-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  font-family: var(--font-label);
  font-weight: 500;
  font-size: 0.8125rem;
  color: var(--color-gold-light);
  border: 1px solid rgba(212, 175, 55, 0.55);
  background: rgba(212, 175, 55, 0.08);
  border-radius: 2px;
}

.page-faq__hero-index {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
  margin-top: var(--space-xl);
}

.page-faq__index-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  color: var(--color-primary-foreground);
  text-decoration: none;
  background: rgba(245, 244, 240, 0.08);
  border: 1px solid rgba(245, 244, 240, 0.18);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.page-faq__index-item:hover {
  background: rgba(212, 175, 55, 0.18);
  border-color: var(--color-gold);
}

.page-faq__index-num {
  font-family: var(--font-label);
  font-weight: 700;
  font-size: 0.8125rem;
  color: var(--color-gold);
  letter-spacing: 0.06em;
}

.page-faq__index-text {
  font-family: var(--font-label);
  font-weight: 500;
  font-size: 0.9375rem;
}

/* ========== 主体布局 ========== */
.page-faq__main {
  padding: var(--space-2xl) 0;
}

.page-faq__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-2xl);
}

.page-faq__sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

/* ========== 分类树 ========== */
.page-faq__tree {
  position: relative;
  overflow: hidden;
  padding: var(--space-lg);
  background: var(--color-card);
  border: 1px solid var(--color-border);
}

.page-faq__tree::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--color-gold), rgba(212, 175, 55, 0.12));
}

.page-faq__tree-label {
  margin: 0 0 var(--space-md);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-primary);
}

.page-faq__tree-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  width: 100%;
  padding: 12px 12px 12px 18px;
  border: 0;
  border-left: 2px solid var(--color-border);
  background: transparent;
  font-family: var(--font-label);
  font-weight: 500;
  font-size: 0.9375rem;
  line-height: 1.4;
  color: var(--color-text-medium);
  text-align: left;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

.page-faq__tree-btn:hover {
  background: rgba(11, 59, 74, 0.06);
  border-left-color: var(--color-gold);
  color: var(--color-primary);
}

.page-faq__tree-btn.is-active {
  background: var(--color-primary);
  border-left-color: var(--color-gold);
  color: var(--color-primary-foreground);
}

.page-faq__tree-count {
  flex: none;
  padding: 2px 8px;
  border-radius: 999px;
  font-family: var(--font-label);
  font-size: 0.75rem;
  background: rgba(11, 59, 74, 0.08);
  color: var(--color-primary);
}

.page-faq__tree-btn.is-active .page-faq__tree-count {
  background: rgba(245, 244, 240, 0.16);
  color: var(--color-gold-light);
}

.page-faq__sidebar-note {
  padding: var(--space-lg);
  background: var(--color-bg-alt);
  border: 1px dashed var(--color-border-strong);
}

.page-faq__sidebar-note-title {
  margin: 0 0 6px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-primary);
}

.page-faq__sidebar-note-text {
  margin: 0 0 16px;
  font-family: var(--font-body);
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--color-text-medium);
}

/* ========== 分组与手风琴内容 ========== */
.page-faq__group {
  margin-bottom: var(--space-2xl);
}

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

.page-faq__group-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin: 0 0 var(--space-lg);
  scroll-margin-top: 96px;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.375rem;
  line-height: 1.3;
  color: var(--color-primary);
}

.page-faq__group-title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, rgba(212, 175, 55, 0.65), rgba(212, 175, 55, 0));
}

.page-faq__group-index {
  flex: none;
  padding: 2px 8px;
  font-family: var(--font-label);
  font-weight: 700;
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  color: var(--color-gold);
  background: rgba(212, 175, 55, 0.1);
  border: 1px solid var(--color-border);
  transform: skewX(-6deg);
}

.page-faq .accordion__trigger {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  width: 100%;
  text-align: left;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-text-dark);
}

.page-faq__q-num {
  flex: none;
  padding: 2px 7px;
  font-family: var(--font-label);
  font-weight: 700;
  font-size: 0.8125rem;
  color: var(--color-primary);
  background: rgba(212, 175, 55, 0.14);
  border: 1px solid var(--color-border);
  transform: skewX(-6deg);
}

.page-faq__q-text {
  flex: 1;
  display: inline;
}

.page-faq__answer {
  display: grid;
  gap: var(--space-sm);
  padding-top: 4px;
  font-family: var(--font-body);
}

.page-faq__answer p {
  margin: 0;
  color: var(--color-text-medium);
  line-height: 1.8;
}

.page-faq__answer a {
  color: var(--color-primary);
  text-decoration-color: var(--color-gold);
  font-weight: 500;
}

.page-faq__steps,
.page-faq__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq__steps li {
  position: relative;
  counter-increment: faq-step;
  padding-left: 36px;
  margin-bottom: 10px;
  color: var(--color-text-medium);
  line-height: 1.75;
}

.page-faq__steps {
  counter-reset: faq-step;
}

.page-faq__steps li::before {
  content: counter(faq-step);
  position: absolute;
  left: 0;
  top: 2px;
  width: 24px;
  height: 24px;
  background: var(--color-primary);
  color: var(--color-gold-light);
  font-family: var(--font-label);
  font-weight: 700;
  font-size: 0.75rem;
  line-height: 24px;
  text-align: center;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%);
}

.page-faq__list li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 8px;
  color: var(--color-text-medium);
  line-height: 1.75;
}

.page-faq__list li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 0.7em;
  width: 8px;
  height: 8px;
  background: var(--color-gold);
  transform: rotate(45deg) scale(0.72);
  transform-origin: center;
}

/* ========== 图片 ========== */
.page-faq__figure {
  margin: var(--space-sm) 0 0;
}

.page-faq__figure--small {
  max-width: 340px;
}

.page-faq__figure-img {
  display: block;
  max-width: 100%;
  height: auto;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 4px 4px 18px 4px;
}

.page-faq__figure figcaption {
  margin-top: 8px;
  font-family: var(--font-body);
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--color-text-medium);
}

/* ========== 设备面板 ========== */
.page-faq__device-panel {
  margin-bottom: var(--space-lg);
}

.page-faq__device-title {
  margin: 0 0 var(--space-md);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-wine);
}

.page-faq__device-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm);
}

.page-faq__device-item {
  padding: var(--space-md);
  background: var(--color-card);
  border: 1px solid var(--color-border);
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.page-faq__device-item:hover {
  border-color: var(--color-gold);
  transform: translateY(-2px);
}

.page-faq__device-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--color-primary);
  color: var(--color-gold-light);
  font-family: var(--font-label);
  font-weight: 700;
  font-size: 0.8125rem;
  border-radius: 8px 8px 8px 2px;
}

.page-faq__device-name {
  margin: 10px 0 4px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--color-text-dark);
}

.page-faq__device-detail {
  margin: 0;
  font-family: var(--font-body);
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--color-text-medium);
}

/* ========== 底部支持 CTA ========== */
.page-faq__support {
  background: linear-gradient(120deg, var(--color-primary-deep), var(--color-primary) 58%, var(--color-indigo));
  color: var(--color-primary-foreground);
}

.page-faq__support-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  align-items: flex-start;
}

.page-faq__support-title {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.5rem;
}

.page-faq__support-text {
  margin: 0;
  max-width: 58ch;
  font-family: var(--font-body);
  color: rgba(245, 244, 240, 0.84);
  line-height: 1.75;
}

.page-faq__support-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.page-faq__support .btn--outline {
  border-color: rgba(245, 244, 240, 0.6);
  color: var(--color-primary-foreground);
}

.page-faq__support .btn--outline:hover {
  background: rgba(245, 244, 240, 0.12);
  border-color: var(--color-gold);
  color: var(--color-gold-light);
}

/* ========== 信任条 ========== */
.page-faq__trust {
  background: var(--color-card);
  border-bottom: 1px solid var(--color-border);
}

.page-faq__trust-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm) var(--space-md);
  padding: var(--space-lg) 0;
}

.page-faq__trust-item {
  font-family: var(--font-label);
  font-weight: 500;
  font-size: 0.9375rem;
  color: var(--color-text-medium);
}

.page-faq__trust-divider {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-gold);
}

/* ========== 响应式 ========== */
@media (min-width: 640px) {
  .page-faq__device-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-faq__support-inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

@media (min-width: 900px) {
  .page-faq__hero {
    padding-top: var(--space-2xl);
  }

  .page-faq__hero-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: var(--space-2xl);
    align-items: end;
  }

  .page-faq__hero-index {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-top: 0;
  }

  .page-faq__index-item {
    min-width: 190px;
  }

  .page-faq__layout {
    grid-template-columns: var(--faq-sidebar-w) minmax(0, 1fr);
    gap: var(--space-2xl);
    align-items: start;
  }

  .page-faq__sidebar {
    position: sticky;
    top: 24px;
  }
}