.page-faq {
  --faq-grid-dot: rgba(10, 21, 38, 0.04);
  background-color: var(--mist-gray);
}

/* ========== 首屏 HERO ========== */
.page-faq .faq-hero {
  background-color: var(--arena-blue);
  background-image: radial-gradient(var(--line-blue) 1.2px, transparent 1.2px);
  background-size: 26px 26px;
  position: relative;
  overflow: hidden;
  padding-bottom: 2.5rem;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 55%;
  height: 100%;
  background: linear-gradient(100deg, transparent 55%, rgba(0, 229, 160, 0.08) 55%, rgba(0, 229, 160, 0.18) 62%, transparent 62%);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 6%;
  bottom: 10%;
  width: 130px;
  height: 130px;
  border-radius: 50%;
  background: rgba(255, 107, 44, 0.12);
  filter: blur(40px);
  pointer-events: none;
}

.page-faq .faq-hero-top {
  padding-top: 1.5rem;
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero-inner {
  display: grid;
  gap: 1.5rem;
  padding-top: 1.5rem;
  padding-bottom: 0.5rem;
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero-copy .section-kicker {
  color: var(--electric-green);
}

.page-faq .faq-hero h1 {
  font-family: var(--font-headline);
  font-size: clamp(2.1rem, 5vw, 4rem);
  line-height: 1.04;
  color: var(--white-ice);
  letter-spacing: 0.02em;
  margin: 0.6rem 0 1rem;
}

.page-faq .faq-hero-accent {
  color: var(--electric-green);
}

.page-faq .faq-hero-lead {
  color: rgba(232, 236, 241, 0.84);
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.7;
  max-width: 34em;
}

.page-faq .faq-hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.2rem;
}

.page-faq .faq-hero-tags .tag {
  text-decoration: none;
}

.page-faq .faq-hero-tags .tag-outline {
  border-color: rgba(232, 236, 241, 0.6);
  color: var(--ice-light);
}

.page-faq .faq-hero-tags .tag-green {
  border-color: var(--electric-green);
}

.page-faq .faq-hero-media {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.32);
  aspect-ratio: 12 / 5;
}

.page-faq .faq-hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ========== 主双栏 ========== */
.page-faq .faq-layout {
  display: grid;
  gap: 1.5rem;
  padding-top: 2rem;
  padding-bottom: 3rem;
}

/* 左侧分类 */
.page-faq .faq-cat-card {
  background: linear-gradient(160deg, var(--arena-blue) 30%, var(--shadow-dark) 120%);
  border-radius: var(--radius-lg);
  padding: 1.8rem 1.5rem;
  color: var(--white-ice);
  box-shadow: 0 14px 30px rgba(10, 21, 38, 0.18);
}

.page-faq .faq-cat-kicker {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--electric-green);
  letter-spacing: 0.08em;
  margin: 0 0 0.4rem;
}

.page-faq .faq-cat-card h2 {
  font-family: var(--font-headline);
  font-size: 1.8rem;
  margin: 0 0 1.2rem;
  color: var(--white-ice);
}

.page-faq .faq-cat-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1.6rem;
  display: grid;
  gap: 0.5rem;
}

.page-faq .faq-cat-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1rem;
  border-radius: var(--radius-md);
  color: var(--ice-light);
  background: rgba(255, 255, 255, 0.05);
  text-decoration: none;
  font-family: var(--font-body);
  font-size: 1rem;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.page-faq .faq-cat-link span {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  opacity: 0.8;
}

.page-faq .faq-cat-link:hover,
.page-faq .faq-cat-link:focus-visible {
  background: var(--electric-green);
  color: var(--arena-blue);
  transform: translateX(4px);
}

.page-faq .faq-cat-link::after {
  content: "→";
  font-family: var(--font-mono);
  transition: transform 0.2s ease;
}

.page-faq .faq-cat-link:hover::after,
.page-faq .faq-cat-link:focus-visible::after {
  transform: translateX(4px);
}

.page-faq .faq-cat-help {
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  padding-top: 1.4rem;
  display: grid;
  gap: 0.8rem;
}

.page-faq .faq-cat-help p {
  margin: 0;
  color: var(--ice-light);
  font-size: 0.95rem;
}

.page-faq .faq-cat-help .btn {
  width: fit-content;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.page-faq .faq-cat-more {
  color: var(--electric-green);
  text-decoration: underline;
  text-underline-offset: 4px;
  font-size: 0.95rem;
}

/* 右侧主体 */
.page-faq .faq-main {
  display: grid;
  gap: 2rem;
  min-width: 0;
}

.page-faq .faq-quick {
  background: var(--white-ice);
  border: 1px solid var(--line-blue);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}

.page-faq .faq-quick-head {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin-bottom: 1rem;
}

.page-faq .faq-quick-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(0, 229, 160, 0.18);
  color: var(--electric-green);
  font-family: var(--font-mono);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.page-faq .faq-quick h2 {
  font-family: var(--font-headline);
  font-size: 1.45rem;
  margin: 0;
  color: var(--carbon-text);
}

.page-faq .faq-quick-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.page-faq .faq-quick-item {
  display: inline-flex;
  align-items: center;
  padding: 0.55rem 1rem;
  border-radius: 999px;
  background: var(--mist-gray);
  border: 1px solid var(--ice-light);
  color: var(--steel-muted);
  font-size: 0.92rem;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.page-faq .faq-quick-item:hover,
.page-faq .faq-quick-item:focus-visible {
  background: var(--electric-green);
  color: var(--arena-blue);
  transform: translateY(-2px);
}

/* ========== 问答组 ========== */
.page-faq .faq-group {
  background: var(--white-ice);
  border-radius: var(--radius-lg);
  border: 1px solid var(--ice-light);
  overflow: hidden;
  scroll-margin-top: 110px;
}

.page-faq .faq-group-head {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.6rem 1.4rem 1.2rem;
  border-left: 4px solid transparent;
  transition: border-left-color 0.3s ease;
}

.page-faq .faq-group:target .faq-group-head {
  border-left-color: var(--electric-green);
}

.page-faq .faq-group-num {
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--electric-green);
  line-height: 1;
}

.page-faq .faq-group-head h2 {
  font-family: var(--font-headline);
  font-size: 1.7rem;
  margin: 0 0 0.25rem;
  color: var(--carbon-text);
}

.page-faq .faq-group-head p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--steel-muted);
}

.page-faq .faq-group-body {
  border-top: 1px solid var(--ice-light);
}

/* ========== 手风琴条目 ========== */
.page-faq .faq-item {
  border-bottom: 1px solid var(--mist-gray);
}

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

.page-faq .faq-item summary {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 1.1rem 1.4rem;
  cursor: pointer;
  min-height: 44px;
  transition: background 0.2s ease;
}

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

.page-faq .faq-item summary:hover,
.page-faq .faq-item summary:focus-visible {
  background: var(--mist-gray);
}

.page-faq .faq-item-icon {
  flex: 0 0 30px;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: rgba(11, 30, 59, 0.06);
  color: var(--arena-blue);
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 1.1rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease, color 0.2s ease;
}

.page-faq .faq-item[open] .faq-item-icon {
  background: var(--electric-green);
  color: var(--arena-blue);
}

.page-faq .faq-item-text {
  flex: 1;
  font-weight: 600;
  color: var(--carbon-text);
  font-size: 1rem;
  line-height: 1.5;
}

.page-faq .faq-item[open] .faq-item-text {
  color: var(--arena-blue);
}

.page-faq .faq-item summary::after {
  content: "";
  flex: 0 0 24px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 2px solid var(--line-blue);
  background-image:
    linear-gradient(var(--arena-blue), var(--arena-blue)),
    linear-gradient(var(--arena-blue), var(--arena-blue));
  background-position: center;
  background-size: 11px 2px, 2px 11px;
  background-repeat: no-repeat;
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.page-faq .faq-item[open] summary::after {
  transform: rotate(45deg);
  border-color: var(--electric-green);
}

.page-faq .faq-item-a {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  transition: grid-template-rows 0.35s ease, opacity 0.25s ease;
}

.page-faq .faq-item[open] .faq-item-a {
  grid-template-rows: 1fr;
  opacity: 1;
}

.page-faq .faq-item-a-inner {
  overflow: hidden;
  padding: 0 1.4rem 1.2rem 4.4rem;
}

.page-faq .faq-item-a-inner p {
  margin: 0;
  font-size: 0.97rem;
  line-height: 1.75;
  color: var(--steel-muted);
}

.page-faq .faq-item-a-inner a {
  color: var(--electric-green);
  text-decoration: underline;
  text-underline-offset: 4px;
  font-weight: 600;
}

/* ========== 订阅三步走 ========== */
.page-faq .faq-steps {
  background-color: var(--arena-blue);
  background-image: radial-gradient(var(--line-blue) 1px, transparent 1px);
  background-size: 24px 24px;
  padding: 3rem 0;
  position: relative;
  overflow: hidden;
}

.page-faq .faq-steps::after {
  content: "";
  position: absolute;
  left: -2rem;
  bottom: 0;
  width: 60%;
  height: 0.5rem;
  background: linear-gradient(90deg, var(--electric-green), var(--voltage-orange));
  border-radius: 999px 0 0 0;
}

.page-faq .faq-steps-inner {
  display: grid;
  gap: 2rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

.page-faq .faq-steps-media {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.32);
  aspect-ratio: 7 / 5;
}

.page-faq .faq-steps-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.page-faq .faq-steps-copy .section-kicker {
  color: var(--electric-green);
}

.page-faq .faq-steps-copy h2 {
  font-family: var(--font-headline);
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  color: var(--white-ice);
  margin: 0.5rem 0 1.4rem;
}

.page-faq .faq-steps-list {
  list-style: none;
  counter-reset: faq-step;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.page-faq .faq-steps-list li {
  counter-increment: faq-step;
  display: flex;
  align-items: center;
  gap: 0.9rem;
  color: var(--ice-light);
  font-size: 1rem;
  line-height: 1.5;
}

.page-faq .faq-steps-list li::before {
  content: counter(faq-step);
  flex: 0 0 36px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 2px solid var(--electric-green);
  color: var(--electric-green);
  font-family: var(--font-mono);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* ========== 响应式 ========== */
@media (min-width: 768px) {
  .page-faq .faq-steps-inner {
    grid-template-columns: 1.1fr 1fr;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-hero {
    padding-bottom: 3.5rem;
  }

  .page-faq .faq-hero-inner {
    grid-template-columns: 1fr 1.05fr;
    gap: 3rem;
  }

  .page-faq .faq-layout {
    grid-template-columns: 280px 1fr;
    gap: 2.5rem;
    align-items: start;
  }

  .page-faq .faq-cat-card {
    position: sticky;
    top: 110px;
  }

  .page-faq .faq-group-head {
    padding: 1.8rem 2rem 1.4rem;
  }

  .page-faq .faq-item summary {
    padding: 1.2rem 2rem;
  }

  .page-faq .faq-item-a-inner {
    padding: 0 2rem 1.4rem 4.8rem;
  }
}