/* ===== 帮助中心 / 问答页 ===== */
.page-faq {
  background: var(--midnight);
  color: var(--ice);
  font-family: var(--font-sans);
}

/* --- 首屏 --- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(150px, 20vw, 208px) 0 clamp(46px, 6vw, 74px);
  border-bottom: 1px solid rgba(30, 75, 122, 0.55);
}

.page-faq .faq-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.32;
}

.page-faq .faq-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 90% at 84% 6%, rgba(0, 229, 255, 0.16), transparent 58%),
    linear-gradient(180deg, rgba(11, 30, 58, 0.66) 0%, rgba(11, 30, 58, 0.93) 58%, var(--midnight) 100%);
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gut);
}

.page-faq .faq-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 22px 0 0;
  padding: 7px 15px;
  border: 1px solid rgba(0, 229, 255, 0.34);
  border-radius: var(--pill);
  background: rgba(0, 229, 255, 0.08);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-faq .faq-hero h1 {
  margin: 20px 0 0;
  max-width: 17ch;
  font-size: clamp(31px, 6.2vw, 66px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.015em;
}

.page-faq .faq-hero__lede {
  margin: 22px 0 0;
  max-width: 60ch;
  font-size: clamp(16px, 1.9vw, 18px);
  line-height: 1.8;
  color: var(--ink-80);
}

.page-faq .faq-hero__marks {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-hero__marks li {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 8px 16px;
  border: 1px solid var(--steel);
  border-radius: var(--pill);
  background: rgba(18, 48, 90, 0.5);
  font-size: 14px;
  color: var(--ink-70);
}

.page-faq .faq-hero__marks b {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  color: var(--cyan);
}

/* --- 主体骨架：移动端单列 --- */
.page-faq .faq-body {
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(34px, 5vw, 66px) var(--gut) clamp(56px, 8vw, 96px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  align-items: start;
}

.page-faq .faq-rail__title {
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .faq-rail__nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.page-faq .faq-rail__nav::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-rail__link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  padding: 9px 15px;
  border: 1px solid var(--steel);
  border-radius: var(--pill);
  background: rgba(18, 48, 90, 0.5);
  color: var(--ink-70);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--ice);
  border-color: var(--cyan);
  background: rgba(0, 229, 255, 0.12);
}

.page-faq .faq-rail__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
}

.page-faq .faq-rail__count {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mist);
}

.page-faq .faq-stream {
  min-width: 0;
}

/* --- 本地搜索 --- */
.page-faq .faq-finder {
  display: grid;
  gap: 10px;
  padding: 18px 20px 16px;
  margin-bottom: clamp(30px, 4vw, 48px);
  border: 1px solid var(--steel);
  border-radius: var(--rate-lg);
  background: linear-gradient(135deg, rgba(18, 48, 90, 0.92), rgba(6, 20, 40, 0.92));
  box-shadow: inset 0 1px 0 rgba(0, 229, 255, 0.12);
}

.page-faq .faq-finder__label {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-faq .faq-finder__input {
  width: 100%;
  padding: 13px 16px;
  border: 1px solid var(--steel);
  border-radius: var(--rate-md);
  background: rgba(6, 20, 40, 0.8);
  color: var(--ice);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.4;
  outline: none;
  transition: border-color 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.page-faq .faq-finder__input::placeholder {
  color: var(--ink-50);
}

.page-faq .faq-finder__input:focus-visible {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(0, 229, 255, 0.22);
}

.page-faq .faq-finder__hint {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist);
}

/* --- 分组 --- */
.page-faq .faq-group {
  scroll-margin-top: clamp(96px, 14vw, 128px);
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(46px, 6vw, 76px);
}

.page-faq .faq-group__head {
  margin-bottom: 18px;
}

.page-faq .faq-group__head h2 {
  margin: 12px 0 0;
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.01em;
}

.page-faq .faq-group__intro {
  margin: 12px 0 0;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink-70);
}

/* --- 问答条目 --- */
.page-faq .faq-item {
  border-top: 1px solid rgba(30, 75, 122, 0.6);
}

.page-faq .faq-list > .faq-item:last-child {
  border-bottom: 1px solid rgba(30, 75, 122, 0.6);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 18px 4px;
  cursor: pointer;
  list-style: none;
  font-size: clamp(16px, 2vw, 18px);
  font-weight: 700;
  line-height: 1.5;
  color: var(--ice);
  transition: color 0.18s var(--ease);
}

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

.page-faq .faq-item__q::marker {
  content: "";
}

.page-faq .faq-item__q:hover,
.page-faq .faq-item__q:focus-visible {
  color: var(--cyan);
}

.page-faq .faq-item__q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: var(--rate-sm);
}

.page-faq .faq-item__idx {
  flex: 0 0 auto;
  padding-top: 5px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--cyan);
}

.page-faq .faq-item__text {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .faq-item__mark {
  position: relative;
  flex: 0 0 auto;
  width: 21px;
  height: 21px;
  margin-top: 2px;
  border: 1px solid var(--steel);
  border-radius: 50%;
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--mist);
  transition: transform 0.24s var(--ease), opacity 0.24s var(--ease), background 0.18s var(--ease);
}

.page-faq .faq-item__mark::before {
  width: 9px;
  height: 1.5px;
  transform: translate(-50%, -50%);
}

.page-faq .faq-item__mark::after {
  width: 1.5px;
  height: 9px;
  transform: translate(-50%, -50%);
}

.page-faq .faq-item__q:hover .faq-item__mark::before {
  background: var(--cyan);
}

.page-faq .faq-item[open] .faq-item__mark {
  border-color: var(--cyan);
  background: rgba(0, 229, 255, 0.14);
}

.page-faq .faq-item[open] .faq-item__mark::before {
  background: var(--cyan);
}

.page-faq .faq-item[open] .faq-item__mark::after {
  opacity: 0;
  transform: translate(-50%, -50%) rotate(90deg);
}

.page-faq .faq-item__a {
  padding: 2px 4px 22px;
  animation: faqDrop 0.24s var(--ease);
}

@keyframes faqDrop {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: none; }
}

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 72ch;
  font-size: 16px;
  line-height: 1.84;
  color: var(--ink-70);
}

.page-faq .faq-item__a p + p {
  margin-top: 10px;
}

.page-faq .faq-item__a .mono {
  font-family: var(--font-mono);
  font-size: 17px;
  color: var(--cyan);
}

.page-faq .faq-item__a a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.4);
  transition: border-color 0.18s var(--ease);
}

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

/* --- 章节配图 --- */
.page-faq .faq-figure {
  margin: 30px 0 0;
  border: 1px solid var(--steel);
  border-radius: var(--rate-lg);
  overflow: hidden;
  background: var(--abyss);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  opacity: 0.92;
}

.page-faq .faq-figure figcaption {
  padding: 12px 16px;
  border-top: 1px solid rgba(30, 75, 122, 0.6);
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* --- 结尾引导 --- */
.page-faq .faq-cta {
  position: relative;
  margin-top: clamp(52px, 7vw, 86px);
  padding: clamp(26px, 4vw, 42px);
  border-radius: var(--rate-xl);
}

.page-faq .faq-cta h2 {
  margin: 0;
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-faq .faq-cta p {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink-70);
}

.page-faq .faq-cta__mail {
  display: inline-block;
  padding: 4px 0;
  font-family: var(--font-mono);
  font-size: 17px;
  color: var(--cyan) !important;
  word-break: break-all;
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* --- 断点 640：答案区缩进 --- */
@media (min-width: 640px) {
  .page-faq .faq-item__a {
    padding-left: 47px;
  }
}

/* --- 断点 900：左侧粘性导航 + 右侧问答流 --- */
@media (min-width: 900px) {
  .page-faq .faq-body {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: clamp(34px, 5vw, 72px);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 118px;
  }

  .page-faq .faq-rail__title {
    margin-bottom: 14px;
  }

  .page-faq .faq-rail__nav {
    display: block;
    overflow: visible;
    padding: 0;
  }

  .page-faq .faq-rail__link {
    width: 100%;
    padding: 11px 10px 11px 16px;
    border: 0;
    border-left: 3px solid transparent;
    border-radius: 0;
    background: transparent;
    color: var(--ink-70);
    font-size: 15px;
    white-space: normal;
    transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background 0.18s var(--ease);
  }

  .page-faq .faq-rail__link:hover,
  .page-faq .faq-rail__link:focus-visible {
    color: var(--ice);
    border-left-color: var(--cyan);
    background: linear-gradient(90deg, rgba(0, 229, 255, 0.13), transparent 76%);
  }

  .page-faq .faq-rail__count {
    margin-left: auto;
    padding-left: 10px;
  }

  .page-faq .faq-item__q {
    gap: 16px;
    padding: 20px 6px;
  }

  .page-faq .faq-item__a {
    padding: 2px 6px 26px 48px;
  }
}

/* --- 减速偏好 --- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__a {
    animation: none;
  }

  .page-faq .faq-item__mark::before,
  .page-faq .faq-item__mark::after,
  .page-faq .faq-rail__link,
  .page-faq .faq-item__q {
    transition: none;
  }
}