/* ========== FAQ 帮助中心页面专属样式 ========== */
.page-faq {
  --faq-sidebar: 240px;
  --faq-gap: 48px;
  background: var(--color-base);
  color: var(--color-text);
  scroll-behavior: smooth;
}

.page-faq .container {
  max-width: 1360px;
  margin: 0 auto;
  padding: 24px 16px 72px;
}

.page-faq .breadcrumb {
  margin-bottom: 28px;
  font-size: 13px;
  letter-spacing: 0.04em;
}

.page-faq .breadcrumb a {
  color: var(--color-muted);
  text-decoration: none;
  transition: color 250ms ease-out;
}

.page-faq .breadcrumb a:hover {
  color: var(--color-green);
}

.page-faq__hero {
  position: relative;
  padding: 32px 20px 24px;
  border: 1px solid var(--color-line);
  border-radius: 4px;
  background: linear-gradient(135deg, rgba(74, 92, 255, 0.16), rgba(0, 255, 136, 0.05) 55%, rgba(18, 41, 79, 0.2));
  margin-bottom: 40px;
  overflow: hidden;
}

.page-faq__hero::after {
  content: "";
  position: absolute;
  right: -40px;
  top: -40px;
  width: 160px;
  height: 160px;
  background: radial-gradient(circle, rgba(0, 255, 136, 0.15), transparent 60%);
  pointer-events: none;
}

.page-faq__hero .kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--color-green);
  margin: 0 0 10px;
}

.page-faq__hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(24px, 4.4vw, 42px);
  line-height: 1.32;
  margin: 0 0 14px;
  position: relative;
}

.page-faq__hero-desc {
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.8;
  max-width: 760px;
  margin: 0 0 18px;
  position: relative;
}

.page-faq__hero-desc a {
  color: var(--color-green);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.page-faq__hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}

.page-faq__meta-item {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text);
  background: rgba(0, 255, 136, 0.08);
  border: 1px solid rgba(0, 255, 136, 0.22);
  padding: 6px 12px;
  border-radius: 2px;
}

.page-faq__meta-item b {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--color-green);
}

.page-faq__filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq__filter .btn {
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1;
  padding: 9px 16px;
  border: 1px solid var(--color-line);
  border-radius: 2px;
  background: transparent;
  color: var(--color-text);
  cursor: pointer;
  transition: border-color 250ms ease-out, background 250ms ease-out, color 250ms ease-out;
}

.page-faq__filter .btn:hover {
  border-color: var(--color-green);
  color: var(--color-green);
}

.page-faq__filter .btn.is-active {
  border-color: var(--color-orange);
  background: var(--color-orange);
  color: #fff;
}

.page-faq__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: start;
}

.page-faq__index {
  position: relative;
  padding: 20px;
  background: rgba(13, 27, 42, 0.55);
  border: 1px solid var(--color-line);
  border-radius: 4px;
}

.page-faq__index-title {
  font-family: var(--font-heading);
  font-size: 16px;
  letter-spacing: 0.06em;
  color: var(--color-green);
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-line);
}

.page-faq__index-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq__index-list li {
  margin: 0;
}

.page-faq__index-list a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  font-size: 14px;
  color: var(--color-text);
  text-decoration: none;
  border-bottom: 1px solid rgba(44, 58, 94, 0.5);
  transition: color 250ms ease-out, padding-left 250ms ease-out;
}

.page-faq__index-list li:last-child a {
  border-bottom: none;
}

.page-faq__index-list a::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-green-static);
  flex-shrink: 0;
  transition: background 250ms ease-out, box-shadow 250ms ease-out;
}

.page-faq__index-list a:hover {
  color: var(--color-green);
  padding-left: 4px;
}

.page-faq__index-list a:hover::before {
  background: var(--color-green);
  box-shadow: 0 0 8px rgba(0, 255, 136, 0.6);
}

.page-faq__index-tip {
  margin-top: 16px;
  padding: 12px 14px;
  border-left: 2px solid var(--color-orange);
  background: rgba(255, 107, 53, 0.06);
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-muted);
}

.page-faq__index-tip a {
  color: var(--color-orange);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

.page-faq__section {
  padding: 32px 0 40px;
  border-bottom: 1px solid var(--color-line);
  scroll-margin-top: 24px;
}

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

.page-faq__section .kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--color-orange);
  text-transform: uppercase;
  margin: 0 0 8px;
}

.page-faq__section .section-title {
  font-family: var(--font-heading);
  font-size: clamp(22px, 2.6vw, 28px);
  line-height: 1.35;
  margin: 0 0 10px;
}

.page-faq__section .section-desc {
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.8;
  margin: 0 0 26px;
  max-width: 640px;
}

.page-faq__figure {
  margin: 0 0 28px;
  border: 1px solid var(--color-line);
  border-radius: 4px;
  overflow: hidden;
  background: var(--color-panel);
}

.page-faq__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-faq__figure figcaption {
  font-size: 13px;
  color: var(--color-muted);
  padding: 12px 16px;
  border-top: 1px solid var(--color-line);
  line-height: 1.6;
}

.page-faq__accordion {
  border: 1px solid var(--color-line);
  border-radius: 4px;
  overflow: hidden;
  background: rgba(18, 41, 79, 0.35);
}

.page-faq__item {
  background: var(--color-panel);
  border-bottom: 1px solid var(--color-line);
}

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

.page-faq__item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 20px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  line-height: 1.6;
  color: var(--color-text);
  transition: color 250ms ease-out, background 250ms ease-out;
}

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

.page-faq__item summary:hover,
.page-faq__item[open] summary {
  background: rgba(0, 255, 136, 0.04);
  color: var(--color-green);
}

.page-faq__item-icon {
  position: relative;
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.page-faq__item-icon::before,
.page-faq__item-icon::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  background: var(--color-green);
  transition: background 250ms ease-out, transform 250ms ease-out, opacity 250ms ease-out;
}

.page-faq__item-icon::before {
  width: 12px;
  height: 2px;
  transform: translate(-50%, -50%);
}

.page-faq__item-icon::after {
  width: 2px;
  height: 12px;
  transform: translate(-50%, -50%);
}

.page-faq__item[open] .page-faq__item-icon::after {
  transform: translate(-50%, -50%) scaleY(0);
  opacity: 0;
}

.page-faq__accordion .page-faq__item:nth-child(even) .page-faq__item-icon::before,
.page-faq__accordion .page-faq__item:nth-child(even) .page-faq__item-icon::after {
  background: var(--color-orange);
}

.page-faq__item-body {
  padding: 0 20px 22px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--color-muted);
}

.page-faq__item-body p {
  margin: 0 0 8px;
}

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

.page-faq__item-body a {
  color: var(--color-green);
  text-decoration: underline;
  text-underline-offset: 2px;
}

@media (min-width: 900px) {
  .page-faq .container {
    padding: 32px 24px 96px;
  }

  .page-faq__layout {
    grid-template-columns: var(--faq-sidebar) 1fr;
    gap: var(--faq-gap);
  }

  .page-faq__index {
    position: sticky;
    top: 32px;
    max-height: calc(100vh - 64px);
    overflow-y: auto;
  }

  .page-faq__hero {
    padding: 40px 48px 28px;
  }
}