/* 帮助中心 FAQ 页面专属样式 */

.page-faq {
  background: var(--c-black);
  overflow-x: hidden;
}

/* ---- Hero ---- */
.page-faq .faq-hero {
  position: relative;
  padding-top: 32px;
  padding-bottom: 64px;
}

.page-faq .faq-hero::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--c-red) 0%, var(--c-gray) 42%, transparent 100%);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: 32px;
}

.page-faq .faq-hero__title {
  font-family: var(--font-head);
  font-size: clamp(38px, 6vw, 60px);
  line-height: 1.15;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--c-light);
  margin: 18px 0 16px;
}

.page-faq .faq-hero__title::before {
  content: '';
  display: block;
  width: 72px;
  height: 6px;
  background: linear-gradient(90deg, var(--c-red), transparent);
  margin-bottom: 24px;
}

.page-faq .faq-hero__title span {
  color: var(--c-red);
}

.page-faq .faq-hero__lead {
  color: var(--c-mid);
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.7;
}

.page-faq .faq-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 20px 32px;
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--c-gray);
}

.page-faq .faq-hero__stats .stat {
  min-width: 110px;
}

.page-faq .faq-hero__media {
  position: relative;
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  background: var(--c-dark);
  border: 1px solid var(--c-gray);
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-faq .faq-hero__badge {
  position: absolute;
  right: 16px;
  bottom: 16px;
  background: var(--c-red);
  color: var(--c-black);
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.1em;
  padding: 8px 14px;
}

/* ---- 问答主体 ---- */
.page-faq .faq-body {
  display: grid;
  gap: 48px;
  padding-top: 64px;
  padding-bottom: 72px;
}

.page-faq .faq-index {
  position: relative;
  background: var(--c-dark);
  border: 1px solid var(--c-gray);
  padding: 24px 20px;
}

.page-faq .faq-index::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--c-red);
}

.page-faq .faq-index__head {
  margin-bottom: 16px;
}

.page-faq .faq-index__note {
  margin: 8px 0 0;
  color: var(--c-mid);
  font-size: 13px;
}

.page-faq .faq-index__nav {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  padding-bottom: 8px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-index__group {
  flex: 0 0 232px;
  scroll-snap-align: start;
  padding: 14px 12px;
  background: var(--c-black);
  border: 1px solid var(--c-gray);
}

.page-faq .faq-index__group-title {
  font-family: var(--font-head);
  font-size: 16px;
  margin: 0 0 8px;
  padding-bottom: 6px;
  color: var(--c-silver);
  border-bottom: 1px solid var(--c-gray);
}

.page-faq .faq-index__link {
  display: block;
  padding: 6px 0 6px 14px;
  border-left: 2px solid var(--c-gray);
  color: var(--c-mid);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}

.page-faq .faq-index__link:hover {
  color: var(--c-red);
  border-left-color: var(--c-red);
  background: var(--c-gray);
}

/* ---- 答案区 ---- */
.page-faq .faq-main {
  display: grid;
  gap: 56px;
}

.page-faq .faq-section__title {
  font-family: var(--font-head);
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.3;
  margin: 0 0 20px;
  padding-left: 16px;
  border-left: 5px solid var(--c-red);
  color: var(--c-light);
}

.page-faq .faq-item {
  border-bottom: 1px solid var(--c-gray);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-faq .faq-item summary {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 4px;
  cursor: pointer;
  transition: background var(--transition-fast);
}

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

.page-faq .faq-item summary:hover {
  background: var(--c-gray);
}

.page-faq .faq-item summary:focus-visible {
  outline: 2px solid var(--c-blue);
  outline-offset: -2px;
}

.page-faq .faq-item__num {
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 900;
  color: var(--c-red);
  border: 1px solid var(--c-gray);
  background: var(--c-black);
  min-width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.page-faq .faq-item__title {
  color: var(--c-light);
  font-weight: 600;
}

.page-faq .faq-item summary::after {
  content: '+';
  margin-left: auto;
  font-family: var(--font-head);
  font-size: 22px;
  line-height: 1;
  color: var(--c-red);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--c-gray);
  transition: transform var(--transition-base), background var(--transition-fast);
  flex-shrink: 0;
}

.page-faq .faq-item[open] summary::after {
  transform: rotate(45deg);
  background: var(--c-gray);
}

.page-faq .faq-item[open] summary .faq-item__num {
  background: var(--c-red);
  color: var(--c-black);
}

.page-faq .faq-item:target summary {
  background: var(--c-gray);
}

.page-faq .faq-item__body {
  padding: 0 4px 24px 46px;
  color: var(--c-mid);
  font-size: 15px;
  line-height: 1.7;
}

.page-faq .faq-item__body p {
  margin: 0 0 12px;
}

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

/* ---- 信任标注 ---- */
.page-faq .faq-note {
  display: flex;
  gap: 16px;
  margin-top: 12px;
}

.page-faq .faq-note__mark {
  font-family: var(--font-head);
  font-size: 44px;
  line-height: 1;
  color: var(--c-red);
  flex-shrink: 0;
}

.page-faq .faq-note__copy p {
  margin: 0 0 8px;
  color: var(--c-light);
  font-size: 15px;
}

/* ---- 使用指引 ---- */
.page-faq .faq-guide {
  padding-top: 72px;
  border-top: 1px solid var(--c-gray);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-faq .faq-guide__head {
  margin-bottom: 32px;
}

.page-faq .faq-guide__head .section-title {
  font-family: var(--font-head);
  font-size: clamp(28px, 3.4vw, 40px);
  line-height: 1.25;
  margin: 12px 0 8px;
  color: var(--c-light);
}

.page-faq .faq-guide__head .section-intro {
  color: var(--c-mid);
  max-width: 60ch;
}

.page-faq .faq-guide__body {
  display: grid;
  gap: 32px;
}

.page-faq .faq-guide__media {
  background: var(--c-dark);
  border: 1px solid var(--c-gray);
}

.page-faq .faq-guide__media img {
  display: block;
  width: 100%;
  height: auto;
}

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

.page-faq .faq-guide__step {
  position: relative;
  display: flex;
  gap: 20px;
  align-items: flex-start;
  padding-bottom: 32px;
}

.page-faq .faq-guide__step:not(:last-child)::before {
  content: '';
  position: absolute;
  left: 19px;
  top: 44px;
  bottom: 0;
  width: 1px;
  background: var(--c-gray);
}

.page-faq .faq-guide__step-num {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--c-black);
  border: 2px solid var(--c-red);
  color: var(--c-red);
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 900;
  position: relative;
  z-index: 1;
  box-sizing: border-box;
}

.page-faq .faq-guide__step-content {
  flex: 1;
  min-width: 0;
}

.page-faq .faq-guide__step-content h3 {
  margin: 0 0 6px;
  color: var(--c-light);
  font-size: 18px;
}

.page-faq .faq-guide__step-content p {
  margin: 0;
  color: var(--c-mid);
  font-size: 14px;
  line-height: 1.7;
}

/* ---- 中屏及以上 ---- */
@media (min-width: 720px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 40px;
    align-items: center;
  }

  .page-faq .faq-guide__body {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 40px;
    align-items: center;
  }
}

/* ---- 桌面：左侧索引固定，右侧答案区 ---- */
@media (min-width: 900px) {
  .page-faq .faq-body {
    grid-template-columns: 280px minmax(0, 1fr);
    gap: 64px;
    padding-top: 80px;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--header-h) + 32px);
  }

  .page-faq .faq-index__nav {
    display: grid;
    gap: 24px;
    overflow-x: visible;
    scroll-snap-type: none;
    padding-bottom: 0;
  }

  .page-faq .faq-index__group {
    flex: none;
    margin: 0;
    padding: 0;
    background: transparent;
    border: none;
    scroll-snap-align: none;
  }

  .page-faq .faq-item__body {
    padding-right: 8%;
  }
}