.page-faq {
  background-color: var(--color-bg);
  overflow-x: hidden;
}

/* ===== Hero 区 ===== */
.faq-hero {
  position: relative;
  border-bottom: 1px solid var(--color-line);
  background:
    linear-gradient(rgba(30, 30, 30, 0.32) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 30, 30, 0.26) 1px, transparent 1px),
    radial-gradient(ellipse at 80% 20%, rgba(0, 229, 255, 0.09) 0%, transparent 55%),
    var(--color-bg);
  background-size: 44px 44px, 44px 44px, auto, auto;
  padding: 48px 0 60px;
}

.faq-hero::after {
  content: "SUPPORT / FAQ";
  position: absolute;
  top: 24px;
  right: 12px;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.35em;
  color: rgba(160, 160, 160, 0.38);
  text-transform: uppercase;
  pointer-events: none;
}

.faq-hero__inner {
  position: relative;
  z-index: 1;
}

.faq-hero__grid {
  display: grid;
  gap: 40px;
  align-items: center;
}

.faq-hero__content {
  min-width: 0;
}

.faq-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  border: 1px solid var(--color-line);
  border-left: 2px solid var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--color-silver);
  background: rgba(20, 20, 20, 0.6);
  margin-bottom: 20px;
}

.faq-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-headline);
  font-size: 2.5rem;
  line-height: 1.08;
  letter-spacing: -0.02em;
  transform: skew(var(--skew));
  text-transform: uppercase;
  color: var(--color-text);
}

.faq-hero__lead {
  max-width: 34em;
  margin: 0 0 28px;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text-sub);
}

.faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.faq-hero__meta-item {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 8px 14px;
  border: 1px solid var(--color-line);
  background: var(--color-panel);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-text-sub);
}

.faq-hero__meta-value {
  color: var(--color-accent);
  font-weight: 700;
}

.faq-hero__figure {
  margin: 0;
  position: relative;
}

.faq-hero__figure::before {
  content: "";
  position: absolute;
  inset: 8px -8px -8px 8px;
  border: 1px solid rgba(0, 229, 255, 0.28);
  z-index: 0;
  pointer-events: none;
}

.faq-hero__img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--color-line);
  background: var(--color-panel);
}

/* ===== 区块头部通用 ===== */
.faq-section-head {
  margin-bottom: 36px;
}

.faq-section-title {
  margin: 8px 0 8px;
  font-family: var(--font-headline);
  font-size: 2rem;
  line-height: 1.15;
  letter-spacing: -0.01em;
  transform: skew(var(--skew));
  color: var(--color-text);
}

.faq-section-intro {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-text-sub);
}

/* ===== 01 / 帮助分类 ===== */
.faq-categories {
  padding: 64px 0 40px;
}

.faq-category-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.faq-category {
  position: relative;
  display: block;
  padding: 22px 20px 20px;
  background: var(--color-panel);
  border: 1px solid var(--color-line);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease), transform 0.2s var(--ease);
  overflow: hidden;
}

.faq-category::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 2px;
  height: 100%;
  background: var(--gradient-accent);
  transform: scaleY(0);
  transform-origin: bottom;
  transition: transform 0.25s var(--ease);
}

.faq-category:hover,
.faq-category:focus-visible {
  border-color: rgba(198, 255, 0, 0.45);
  background: rgba(20, 20, 20, 0.92);
  transform: translateY(-2px);
}

.faq-category:hover::before,
.faq-category:focus-visible::before {
  transform: scaleY(1);
}

.faq-category__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: 10px;
  transform: skew(var(--skew));
}

.faq-category__name {
  display: block;
  font-family: var(--font-headline);
  font-size: 1.25rem;
  color: var(--color-text);
  margin-bottom: 8px;
}

.faq-category__count {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-accent-blue);
  padding: 2px 8px;
  border: 1px solid rgba(0, 229, 255, 0.3);
  margin-bottom: 12px;
}

.faq-category__tags {
  display: block;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--color-text-dim);
}

/* ===== 02 / 热门问题 ===== */
.faq-questions {
  padding: 40px 0 64px;
  background: linear-gradient(180deg, rgba(20, 20, 20, 0.35) 0%, transparent 140px);
}

.faq-index {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 16px 0 24px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--color-line);
}

.faq-index__link {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-decoration: none;
  color: var(--color-text-sub);
  border: 1px solid var(--color-line);
  background: rgba(20, 20, 20, 0.5);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.faq-index__link::before {
  content: "#";
  color: var(--color-accent);
  margin-right: 4px;
}

.faq-index__link:hover,
.faq-index__link:focus-visible {
  color: var(--color-text);
  border-color: rgba(198, 255, 0, 0.5);
  background: rgba(198, 255, 0, 0.05);
}

.faq-group {
  margin-bottom: 36px;
  scroll-margin-top: calc(var(--header-height) + 16px);
}

.faq-group__title {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 12px;
  font-family: var(--font-headline);
  font-size: 1.35rem;
  transform: skew(var(--skew));
  color: var(--color-text);
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(198, 255, 0, 0.18);
}

.faq-group__letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-accent);
  border: 1px solid rgba(198, 255, 0, 0.35);
  background: rgba(198, 255, 0, 0.05);
  flex: 0 0 28px;
}

.faq-item {
  border-bottom: 1px solid var(--color-line);
}

.faq-item:first-of-type {
  border-top: 1px solid var(--color-line);
}

.faq-item__summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 42px 18px 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  position: relative;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), padding-left 0.2s var(--ease);
  user-select: none;
}

.faq-item__summary::-webkit-details-marker {
  display: none;
}

.faq-item__summary::before {
  content: "";
  flex: 0 0 14px;
  width: 14px;
  height: 14px;
  border: 1px solid rgba(198, 255, 0, 0.45);
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.faq-item__summary::after {
  content: "";
  position: absolute;
  right: 18px;
  top: 50%;
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--color-accent);
  border-bottom: 2px solid var(--color-accent);
  transform: translateY(-70%) rotate(45deg);
  transition: transform 0.25s var(--ease);
}

.faq-item[open] .faq-item__summary::after {
  transform: translateY(-30%) rotate(225deg);
}

.faq-item__summary:hover,
.faq-item__summary:focus-visible {
  color: var(--color-accent);
  padding-left: 4px;
  background: rgba(198, 255, 0, 0.03);
}

.faq-item__summary:hover::before,
.faq-item__summary:focus-visible::before {
  background: rgba(198, 255, 0, 0.2);
  border-color: var(--color-accent);
}

.faq-item__summary:focus-visible {
  outline: 2px solid rgba(198, 255, 0, 0.5);
  outline-offset: -2px;
}

.faq-item__body {
  padding: 0 20px 22px 26px;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--color-text-sub);
}

.faq-item__body p {
  margin: 0 0 10px;
}

.faq-item__body p:last-child {
  margin-bottom: 0;
}

.faq-item__body a {
  color: var(--color-accent-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.faq-item__body a:hover {
  color: var(--color-accent);
}

/* ===== 03 / 联系支持 ===== */
.faq-contact {
  padding: 64px 0 0;
}

.faq-contact__inner {
  display: grid;
  gap: 32px;
  padding: 28px;
  border: 1px solid var(--color-line);
  background:
    linear-gradient(135deg, rgba(198, 255, 0, 0.04) 0%, rgba(0, 229, 255, 0.04) 100%),
    var(--color-panel);
  position: relative;
}

.faq-contact__inner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--gradient-accent);
  opacity: 0.5;
}

.faq-contact__lead {
  margin: 0 0 24px;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--color-text-sub);
}

.faq-contact__items {
  display: grid;
  gap: 12px;
  margin-bottom: 28px;
}

.faq-contact__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: rgba(10, 10, 10, 0.5);
  border-left: 2px solid var(--color-accent-blue);
}

.faq-contact__label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--color-text-dim);
  text-transform: uppercase;
}

.faq-contact__value {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--color-text);
  word-break: break-all;
}

.faq-contact__figure {
  margin: 0;
  align-self: center;
}

.faq-contact__figure img {
  width: 100%;
  height: auto;
  max-width: 600px;
  margin: 0 auto;
  display: block;
  border: 1px solid var(--color-line);
  background: var(--color-bg);
}

/* ===== 响应式 ===== */
@media (min-width: 768px) {
  .faq-category-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .faq-contact__inner {
    padding: 36px;
  }
}

@media (min-width: 1024px) {
  .faq-hero {
    padding: 72px 0 88px;
  }

  .faq-hero__grid {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
  }

  .faq-hero__title {
    font-size: 3.5rem;
  }

  .faq-categories {
    padding: 96px 0 56px;
  }

  .faq-category-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .faq-questions {
    padding: 56px 0 96px;
  }

  .faq-contact {
    padding: 96px 0 0;
  }

  .faq-contact__inner {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
    gap: 48px;
    padding: 44px;
  }
}