/* ============ 帮助中心 / help-center ============ */
.page-faq {
  --faq-body: #D6E1EB;
  --faq-side-w: 296px;
  overflow-x: hidden;
}

/* ---------- 首屏：斜切战术板 ---------- */
.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(26px, 4.5vw, 52px) 0 clamp(36px, 6vw, 68px);
  background: var(--c-navy);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: -34% -14% auto -14%;
  height: 128%;
  background:
    radial-gradient(120% 78% at 78% 0%, rgba(15, 58, 44, .96), rgba(8, 24, 43, 0) 62%),
    linear-gradient(158deg, rgba(20, 50, 74, .9), rgba(8, 24, 43, 0) 72%);
  clip-path: polygon(0 0, 100% 0, 100% 60%, 0 90%);
  animation: faq-slice 720ms var(--ease) both;
}

@keyframes faq-slice {
  from { transform: translateX(24px); opacity: .25; }
  to { transform: translateX(0); opacity: 1; }
}

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

.page-faq .breadcrumb {
  font-size: 13px;
  letter-spacing: .01em;
}

.page-faq .breadcrumb a {
  color: var(--c-cyan);
  text-decoration: none;
}

.page-faq .breadcrumb a:hover,
.page-faq .breadcrumb a:focus-visible {
  text-decoration: underline;
}

.page-faq .faq-hero .eyebrow {
  margin-top: clamp(18px, 3vw, 30px);
}

.page-faq .faq-hero h1 {
  margin: 12px 0 0;
  max-width: 20ch;
}

.page-faq .faq-hero__lede {
  margin: 18px 0 0;
  max-width: 64ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--c-muted);
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 18px;
  margin-top: 24px;
}

.page-faq .faq-hero__meta-note {
  font-family: var(--font-num);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--c-muted);
}

/* 分组快速跳转 */
.page-faq .faq-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-jump a {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 9px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(20, 50, 74, .58);
  color: var(--c-ink);
  font-size: 14px;
  line-height: 1.4;
  text-decoration: none;
  transition: border-color 180ms var(--ease), background-color 180ms var(--ease), transform 180ms var(--ease);
}

.page-faq .faq-jump a:hover,
.page-faq .faq-jump a:focus-visible {
  border-color: var(--c-cyan);
  background: rgba(59, 224, 200, .13);
  transform: translateY(-1px);
}

.page-faq .faq-jump__no {
  font-family: var(--font-num);
  font-size: 12px;
  color: var(--c-cyan);
  letter-spacing: .06em;
}

/* 首屏横幅 */
.page-faq .faq-banner {
  margin: clamp(26px, 4vw, 42px) 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--c-board);
}

.page-faq .faq-banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 3;
  object-fit: cover;
}

/* ---------- 主体骨架 ---------- */
.page-faq .faq-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  padding: clamp(40px, 6vw, 74px) 0 clamp(58px, 8vw, 98px);
}

.page-faq .faq-shell > * {
  min-width: 0;
}

.page-faq .faq-group {
  scroll-margin-top: 84px;
  margin-bottom: clamp(40px, 5vw, 62px);
  --group-accent: var(--c-cyan);
}

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

.page-faq .faq-group--timing {
  --group-accent: var(--c-orange);
}

.page-faq .faq-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  position: relative;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-group__head::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 68px;
  height: 2px;
  background: var(--group-accent);
  border-radius: 2px;
}

.page-faq .faq-group__index {
  font-family: var(--font-num);
  font-size: clamp(26px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  font-variant-numeric: tabular-nums;
  color: var(--group-accent);
}

.page-faq .faq-group__title {
  margin: 0;
}

.page-faq .faq-group__desc {
  flex: 1 1 100%;
  margin: 2px 0 0;
  max-width: 70ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--c-muted);
}

/* ---------- 问答折叠组 ---------- */
.page-faq .faq-group .acc {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-faq .acc__item {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background: rgba(20, 50, 74, .5);
  overflow: hidden;
  transition: border-color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-faq .acc__item:hover {
  border-color: rgba(59, 224, 200, .38);
}

.page-faq .acc__item[open] {
  border-color: var(--group-accent);
  background: rgba(20, 50, 74, .92);
}

.page-faq .acc__sum {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.55;
  color: var(--c-ink);
}

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

.page-faq .acc__sum:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: -2px;
}

.page-faq .faq-q__mark {
  position: relative;
  flex: none;
  width: 18px;
  height: 18px;
  margin-top: 3px;
  border: 1px solid var(--line);
  border-radius: 5px;
  transition: border-color 200ms var(--ease);
}

.page-faq .faq-q__mark::before,
.page-faq .faq-q__mark::after {
  content: "";
  position: absolute;
  background: var(--group-accent);
  border-radius: 2px;
}

.page-faq .faq-q__mark::before {
  left: 4px;
  right: 4px;
  top: 50%;
  height: 2px;
  transform: translateY(-50%);
}

.page-faq .faq-q__mark::after {
  top: 4px;
  bottom: 4px;
  left: 50%;
  width: 2px;
  transform: translateX(-50%);
  transition: opacity 200ms var(--ease);
}

.page-faq .acc__item[open] .faq-q__mark {
  border-color: var(--group-accent);
}

.page-faq .acc__item[open] .faq-q__mark::after {
  opacity: 0;
}

.page-faq .acc__body {
  padding: 0 18px 18px;
  animation: faq-body-in 180ms var(--ease) both;
}

@keyframes faq-body-in {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

.page-faq .acc__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--faq-body);
}

.page-faq .acc__body p + p {
  margin-top: 12px;
}

.page-faq .faq-em {
  font-family: var(--font-num);
  font-size: .96em;
  letter-spacing: .01em;
  color: var(--c-cyan);
}

.page-faq .faq-inline-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding-bottom: 2px;
  color: var(--c-orange);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 122, 41, .45);
  transition: border-color 160ms var(--ease), color 160ms var(--ease);
}

.page-faq .faq-inline-link::after {
  content: "\2192";
  font-family: var(--font-num);
}

.page-faq .faq-inline-link:hover,
.page-faq .faq-inline-link:focus-visible {
  color: var(--c-orange-soft);
  border-color: var(--c-orange-soft);
}

/* 时效分组内的图解 */
.page-faq .faq-figure {
  margin: 0 0 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--c-board);
}

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

/* ---------- 右侧术语速查 ---------- */
.page-faq .faq-side {
  align-self: start;
  padding: 22px 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(15, 58, 44, .72), rgba(20, 50, 74, .34));
}

.page-faq .faq-side__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: -.01em;
  color: var(--c-ink);
}

.page-faq .faq-side__title::after {
  content: "";
  display: block;
  width: 40px;
  height: 2px;
  margin-top: 9px;
  background: var(--c-cyan);
  border-radius: 2px;
}

.page-faq .faq-side__hint {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-muted);
}

.page-faq .faq-terms {
  display: grid;
  gap: 4px;
  margin: 16px 0 0;
}

.page-faq .faq-term {
  padding: 10px 12px;
  border-left: 2px solid rgba(159, 179, 200, .24);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  transition: background-color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-faq .faq-term:hover {
  background: rgba(59, 224, 200, .09);
  border-left-color: var(--c-cyan);
}

.page-faq .faq-term dt {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  line-height: 1.5;
  color: var(--c-ink);
}

.page-faq .faq-term dd {
  margin: 4px 0 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--c-muted);
}

.page-faq .faq-side__foot {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line-soft);
  font-size: 13px;
  line-height: 1.75;
  color: var(--c-muted);
}

.page-faq .faq-side__foot a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(59, 224, 200, .4);
}

.page-faq .faq-side__foot a:hover,
.page-faq .faq-side__foot a:focus-visible {
  border-color: var(--c-cyan);
}

/* ---------- 小屏微调 ---------- */
@media (max-width: 560px) {
  .page-faq .acc__sum {
    font-size: 15px;
    padding: 14px 15px;
  }

  .page-faq .acc__body {
    padding: 0 15px 16px;
  }

  .page-faq .faq-jump a {
    padding: 8px 13px;
    font-size: 13px;
  }

  .page-faq .faq-banner img {
    aspect-ratio: 16 / 9;
  }
}

/* ---------- 桌面：非对称两栏 + 吸顶速查 ---------- */
@media (min-width: 1000px) {
  .page-faq .faq-shell {
    grid-template-columns: minmax(0, 1fr) var(--faq-side-w);
    gap: 52px;
  }

  .page-faq .faq-side {
    position: sticky;
    top: 28px;
  }

  .page-faq .acc__sum {
    padding: 17px 22px;
    font-size: 16.5px;
  }

  .page-faq .acc__body {
    padding: 0 22px 20px;
  }
}

@media (min-width: 1320px) {
  .page-faq .faq-shell {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 64px;
  }
}