/* ===== 帮助中心 /help-center/ ===== */
.page-faq {
  --faq-sticky: 128px;
  --faq-line: rgba(154, 167, 199, 0.18);
  --faq-glass: rgba(27, 34, 51, 0.48);

  position: relative;
  overflow-x: clip;
  background:
    radial-gradient(1100px 520px at 10% -8%, rgba(0, 229, 255, 0.10), transparent 62%),
    radial-gradient(880px 480px at 94% 3%, rgba(124, 77, 255, 0.13), transparent 60%),
    var(--ink);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding-block: clamp(24px, 4vw, 44px) clamp(20px, 3vw, 34px);
}

.page-faq .faq-hero .breadcrumbs {
  margin-bottom: clamp(20px, 3.4vw, 34px);
}

.page-faq .faq-hero__eyebrow {
  color: var(--cyan);
  letter-spacing: 0.16em;
}

.page-faq .faq-hero__title {
  margin: 16px 0 0;
  max-width: 17ch;
  font-size: clamp(34px, 6.6vw, 82px);
  line-height: 1.03;
  letter-spacing: -0.03em;
  font-weight: 900;
  font-style: italic;
  text-wrap: balance;
}

.page-faq .faq-hero__lede {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.55vw, 17px);
  line-height: 1.75;
  color: var(--steel);
}

.page-faq .faq-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 14px clamp(26px, 5vw, 64px);
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: clamp(18px, 2.6vw, 26px) 0 0;
  list-style: none;
  border-top: 1px solid var(--faq-line);
}

.page-faq .faq-stat {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-faq .faq-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-faq .faq-stat:nth-child(2) .faq-stat__num { color: var(--violet); }
.page-faq .faq-stat:nth-child(3) .faq-stat__num { color: var(--lava); }

.page-faq .faq-stat__label {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--steel);
}

/* ---------- 横幅 ---------- */
.page-faq .faq-banner {
  padding-block: 0 clamp(38px, 6vw, 68px);
}

.page-faq .faq-banner__frame {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  clip-path: var(--cut);
  border: 1px solid var(--glass-line);
  background: linear-gradient(120deg, #071019, #150f30);
}

.page-faq .faq-banner__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(90deg, rgba(10, 14, 23, 0.78), rgba(10, 14, 23, 0) 58%);
}

.page-faq .faq-banner__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.74;
}

/* ---------- 通用小标题 ---------- */
.page-faq .faq-h2 {
  margin: 0;
  max-width: 26ch;
  font-size: clamp(23px, 3.1vw, 36px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.page-faq .faq-sub {
  margin: 12px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--steel);
}

/* ---------- 三条路径 ---------- */
.page-faq .faq-paths__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: clamp(24px, 3.6vw, 36px) 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-path {
  position: relative;
  padding: 24px 20px 22px;
  border: 1px solid var(--faq-line);
  clip-path: var(--cut);
  background: linear-gradient(160deg, rgba(27, 34, 51, 0.78), rgba(10, 14, 23, 0.42));
}

.page-faq .faq-path::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 58px;
  height: 3px;
  background: var(--cat, var(--cyan));
}

.page-faq .faq-path:nth-child(1) { --cat: var(--cyan); }
.page-faq .faq-path:nth-child(2) { --cat: var(--violet); }
.page-faq .faq-path:nth-child(3) { --cat: var(--lava); }

.page-faq .faq-path__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cat, var(--cyan));
}

.page-faq .faq-path__title {
  margin: 12px 0 9px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.48;
}

.page-faq .faq-path__text {
  margin: 0 0 20px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--steel);
}

.page-faq .faq-path__cta {
  font-size: 13px;
}

/* ---------- 问答区布局 ---------- */
.page-faq .faq-faqs .faq-sec-head {
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

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

/* ---------- 左侧索引 ---------- */
.page-faq .faq-index__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--steel);
}

.page-faq .faq-index__list {
  display: flex;
  flex-direction: row;
  gap: 6px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
}

.page-faq .faq-index__list > li {
  flex: 0 0 auto;
}

.page-faq .faq-index__link {
  display: grid;
  grid-template-columns: auto auto;
  align-items: baseline;
  gap: 9px;
  padding: 9px 12px;
  border-bottom: 2px solid var(--faq-line);
  color: var(--steel);
  font-size: 14px;
  line-height: 1.45;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--cyan);
  background: rgba(0, 229, 255, 0.07);
  outline: none;
}

.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

/* ---------- 问答分类 ---------- */
.page-faq .faq-cat {
  scroll-margin-top: var(--faq-sticky);
}

.page-faq .faq-cat + .faq-cat {
  margin-top: clamp(40px, 6vw, 68px);
}

.page-faq .faq-cat:nth-child(1) { --cat: var(--cyan); }
.page-faq .faq-cat:nth-child(2) { --cat: var(--violet); }
.page-faq .faq-cat:nth-child(3) { --cat: var(--lava); }
.page-faq .faq-cat:nth-child(4) { --cat: var(--mint); }
.page-faq .faq-cat:nth-child(5) { --cat: var(--cyan); }
.page-faq .faq-cat:nth-child(6) { --cat: var(--lava); }

.page-faq .faq-cat__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
}

.page-faq .faq-cat__num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--ink);
  background: var(--cat, var(--cyan));
  padding: 3px 9px;
  clip-path: var(--cut-sm);
}

.page-faq .faq-cat__title {
  margin: 0;
  font-size: clamp(20px, 2.4vw, 27px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.015em;
}

.page-faq .faq-cat__desc {
  margin: 10px 0 0;
  max-width: 56ch;
  font-size: 14px;
  line-height: 1.7;
  color: var(--steel);
}

.page-faq .faq-cat__rule {
  height: 2px;
  margin: 16px 0 22px;
  background: linear-gradient(
    90deg,
    var(--cat, var(--cyan)) 0%,
    var(--cat, var(--cyan)) 16%,
    var(--faq-line) 16%,
    var(--faq-line) 100%
  );
}

.page-faq .faq-cat__tail {
  margin: 26px 0 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--steel);
}

.page-faq .faq-cat__tail a {
  color: var(--cyan);
  text-underline-offset: 3px;
}

/* ---------- 问答条目 ---------- */
.page-faq .faq-item {
  border: 1px solid var(--faq-line);
  border-left: 2px solid rgba(154, 167, 199, 0.3);
  background: var(--faq-glass);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.page-faq .faq-item + .faq-item {
  margin-top: 9px;
}

.page-faq .faq-item:hover {
  border-left-color: var(--cat, var(--cyan));
}

.page-faq .faq-item[open] {
  border-left-color: var(--cat, var(--cyan));
  background: rgba(27, 34, 51, 0.66);
}

.page-faq .faq-item__q {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-size: clamp(15px, 1.5vw, 17px);
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper);
}

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

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

.page-faq .faq-item__num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--cat, var(--cyan));
}

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

.page-faq .faq-item__sign {
  position: relative;
  flex: 0 0 auto;
  width: 12px;
  height: 12px;
  align-self: center;
}

.page-faq .faq-item__sign::before,
.page-faq .faq-item__sign::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 2px;
  margin-top: -1px;
  background: var(--steel);
  transition: transform 0.2s ease, background-color 0.2s ease;
}

.page-faq .faq-item__sign::after {
  transform: rotate(90deg);
}

.page-faq .faq-item[open] .faq-item__sign::after {
  transform: rotate(0deg);
}

.page-faq .faq-item[open] .faq-item__sign::before,
.page-faq .faq-item[open] .faq-item__sign::after {
  background: var(--cat, var(--cyan));
}

.page-faq .faq-item__a {
  padding: 0 18px 20px;
  max-width: 62ch;
}

.page-faq .faq-cat .faq-item:nth-of-type(even) .faq-item__a {
  max-width: 48ch;
}

.page-faq .faq-item__a p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--paper);
  opacity: 0.84;
}

.page-faq .faq-item__copy {
  margin-top: 14px;
  padding: 5px 11px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--steel);
  background: transparent;
  border: 1px solid var(--faq-line);
  cursor: pointer;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.page-faq .faq-item__copy:hover,
.page-faq .faq-item__copy:focus-visible {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
  outline: none;
}

/* ---------- 排查示意图 ---------- */
.page-faq .faq-figure {
  margin: 26px 0 0;
  padding: 0;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 640px;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  clip-path: var(--cut);
  border: 1px solid var(--glass-line);
  background: #0b1120;
  opacity: 0.86;
}

.page-faq .faq-figure__cap {
  margin-top: 12px;
  max-width: 62ch;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 760px) {
  .page-faq .faq-banner__frame {
    aspect-ratio: 21 / 6;
  }

  .page-faq .faq-paths__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    align-items: start;
  }

  .page-faq .faq-path:nth-child(2) { margin-top: 26px; }
  .page-faq .faq-path:nth-child(3) { margin-top: 52px; }

  .page-faq .faq-item__a {
    padding: 0 22px 22px 46px;
  }
}

/* ---------- 桌面：吸顶索引 + 内容列 ---------- */
@media (min-width: 940px) {
  .page-faq .faq-layout {
    grid-template-columns: minmax(178px, 226px) minmax(0, 1fr);
    gap: clamp(34px, 5.5vw, 72px);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: var(--faq-sticky);
    align-self: start;
    padding: 4px 0 4px 2px;
  }

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

  .page-faq .faq-index__list {
    flex-direction: column;
    gap: 2px;
    padding: 0;
    overflow: visible;
  }

  .page-faq .faq-index__list > li {
    flex: 1 1 auto;
  }

  .page-faq .faq-index__link {
    grid-template-columns: auto minmax(0, 1fr);
    white-space: normal;
    padding: 10px 10px 10px 13px;
    border-bottom: 0;
    border-left: 2px solid var(--faq-line);
  }

  .page-faq .faq-index__link:hover,
  .page-faq .faq-index__link:focus-visible {
    border-left-color: var(--cyan);
    border-bottom-color: transparent;
  }
}

/* ---------- 大屏细节 ---------- */
@media (min-width: 1180px) {
  .page-faq .faq-hero__title {
    max-width: 15ch;
  }

  .page-faq .faq-item__q {
    padding: 18px 22px;
  }
}

/* ---------- 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-item__sign::before,
  .page-faq .faq-item__sign::after,
  .page-faq .faq-index__link,
  .page-faq .faq-item__copy {
    transition: none;
  }
}