/* ============================================================
   帮助中心 / page-faq
   ============================================================ */

.page-faq {
  --faq-line: 1px solid var(--grid);
  --faq-radius: 16px;
  background: var(--void);
  color: var(--white);
}

/* ---------------- 首屏框景 ---------------- */

.page-faq .faq-hero {
  padding: 32px 0 24px;
  background:
    radial-gradient(120% 70% at 84% -18%, rgba(0, 227, 233, .13), transparent 60%),
    radial-gradient(90% 60% at -8% 112%, rgba(255, 106, 26, .09), transparent 58%);
}

.page-faq .faq-hero__frame {
  position: relative;
  margin-top: 16px;
  padding: 30px 18px 32px;
  border: var(--faq-line);
  border-radius: var(--faq-radius);
  background: linear-gradient(180deg, rgba(10, 21, 38, .96), rgba(5, 9, 18, .84));
  overflow: hidden;
}

.page-faq .faq-hero__frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    0deg,
    rgba(233, 242, 255, .05) 0 1px,
    transparent 1px 5px
  );
  pointer-events: none;
}

.page-faq .faq-hero__frame::after {
  content: "";
  position: absolute;
  top: -30%;
  right: -14%;
  width: 58%;
  height: 172%;
  background: linear-gradient(102deg, transparent 43%, rgba(0, 227, 233, .14) 50%, transparent 57%);
  pointer-events: none;
}

.page-faq .faq-hero__frame > * {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero__corners span {
  position: absolute;
  z-index: 3;
  width: 20px;
  height: 20px;
  border: 1px solid var(--cyan);
  opacity: .75;
  pointer-events: none;
}

.page-faq .faq-hero__corners span:first-child {
  top: 8px;
  left: 8px;
  border-right: 0;
  border-bottom: 0;
}

.page-faq .faq-hero__corners span:last-child {
  right: 8px;
  bottom: 8px;
  border-top: 0;
  border-left: 0;
}

.page-faq .faq-h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 8.4vw, 76px);
  line-height: 1.08;
  letter-spacing: -.02em;
  max-width: 15em;
}

.page-faq .faq-h1__accent {
  color: var(--cyan);
}

.page-faq .faq-hero__frame .lede {
  margin: 18px 0 0;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------------- 三步引导 ---------------- */

.page-faq .faq-start {
  padding: 52px 0 48px;
}

.page-faq .faq-figure {
  margin-top: 26px;
  border: var(--faq-line);
  border-radius: 14px;
  overflow: hidden;
  background: var(--steel);
  line-height: 0;
}

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

.page-faq .faq-steps {
  position: relative;
  display: grid;
  gap: 18px;
  margin: 30px 0 0;
  padding: 0 0 0 28px;
  list-style: none;
  border-left: var(--faq-line);
}

.page-faq .faq-step {
  position: relative;
  padding: 18px 18px 20px;
  border: var(--faq-line);
  border-radius: 14px;
  background: linear-gradient(180deg, rgba(16, 31, 53, .92), rgba(10, 21, 38, .88));
}

.page-faq .faq-step::before {
  content: "";
  position: absolute;
  top: 26px;
  left: -28px;
  width: 9px;
  height: 9px;
  border: 2px solid var(--cyan);
  border-radius: 50%;
  background: var(--void);
  transform: translateX(-50%);
}

.page-faq .faq-step__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-faq .faq-step h3 {
  margin: 8px 0 0;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.45;
}

.page-faq .faq-step p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.page-faq .faq-step .faq-step__after {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--grid);
  color: var(--white);
  font-size: 14px;
  line-height: 1.7;
}

/* ---------------- 问答区 ---------------- */

.page-faq .faq-qa {
  padding: 52px 0 48px;
  background: var(--night);
  border-top: var(--faq-line);
  border-bottom: var(--faq-line);
}

.page-faq .faq-filter {
  position: sticky;
  top: calc(var(--header-h) + 6px);
  z-index: 6;
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 24px 0 28px;
  padding: 8px 14px;
  border: 1px solid var(--grid);
  border-radius: var(--radius-capsule);
  background: rgba(5, 9, 18, .9);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.page-faq .faq-filter__label {
  flex: 0 0 auto;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-faq .faq-filter__input {
  flex: 1 1 auto;
  min-width: 0;
  padding: 6px 4px;
  border: 0;
  background: transparent;
  color: var(--white);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
}

.page-faq .faq-filter__input::placeholder {
  color: var(--mist);
}

.page-faq .faq-filter__input:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: 2px;
  border-radius: 8px;
}

/* 分组 */

.page-faq .faq-group {
  --bar: var(--cyan);
  margin-top: 30px;
  padding-left: 14px;
  border-left: 3px solid var(--bar);
}

.page-faq .faq-group:first-of-type {
  margin-top: 0;
}

.page-faq .faq-group--entry { --bar: var(--cyan); }
.page-faq .faq-group--rule { --bar: var(--orange); }
.page-faq .faq-group--client { --bar: var(--amber); }
.page-faq .faq-group--path { --bar: var(--paper); }

.page-faq .faq-group__head {
  padding-bottom: 12px;
  border-bottom: var(--faq-line);
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: .01em;
}

/* 折叠项 */

.page-faq .faq-list {
  display: block;
}

.page-faq .faq-item {
  border-bottom: var(--faq-line);
}

.page-faq .faq-item:last-child {
  border-bottom: 0;
}

.page-faq .faq-item__summary {
  display: grid;
  grid-template-columns: 28px 1fr 18px;
  gap: 10px;
  align-items: center;
  padding: 15px 2px;
  cursor: pointer;
  list-style: none;
  transition: background-color .18s var(--ease);
}

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

.page-faq .faq-item__summary:hover {
  background: rgba(0, 227, 233, .045);
}

.page-faq .faq-item__summary:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: 2px;
  border-radius: 8px;
}

.page-faq .faq-item__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
  transition: color .18s var(--ease);
}

.page-faq .faq-item[open] .faq-item__num {
  color: var(--cyan);
}

.page-faq .faq-item__q {
  font-size: 15.5px;
  font-weight: 500;
  line-height: 1.55;
  color: var(--white);
}

.page-faq .faq-item__mark {
  position: relative;
  justify-self: end;
  width: 16px;
  height: 16px;
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  width: 16px;
  height: 1.5px;
  background: var(--mist);
  transform: translateY(-50%);
  transition: transform .2s var(--ease), background-color .2s var(--ease);
}

.page-faq .faq-item__mark::after {
  transform: translateY(-50%) rotate(90deg);
}

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

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

.page-faq .faq-item__body {
  padding: 0 2px 18px;
}

.page-faq .faq-item__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-faq .faq-item__body a {
  color: var(--cyan);
  border-bottom: 1px solid rgba(0, 227, 233, .35);
}

.page-faq .faq-item__body a:hover {
  color: var(--cyan-deep);
  border-bottom-color: var(--cyan-deep);
}

/* 访问记录两栏 */

.page-faq .faq-path-grid {
  display: grid;
  gap: 22px;
}

.page-faq .faq-path-aside {
  margin: 0;
}

.page-faq .faq-path-aside img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border: var(--faq-line);
  border-radius: 14px;
  background: var(--steel);
  object-fit: cover;
}

.page-faq .faq-path-aside__cap {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.65;
  letter-spacing: .02em;
  color: var(--mist);
}

.page-faq .faq-qa__tail {
  margin: 36px 0 0;
  text-align: center;
}

/* ---------------- 联系承接 ---------------- */

.page-faq .faq-help {
  padding: 52px 0 64px;
  background: linear-gradient(180deg, var(--night) 0%, var(--void) 72%);
}

.page-faq .faq-help__grid {
  display: grid;
  gap: 26px;
}

.page-faq .faq-help__lede {
  margin: 12px 0 0;
  max-width: 46ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-need-list {
  display: grid;
  gap: 10px;
  margin: 22px 0 26px;
  padding: 0;
  list-style: none;
}

.page-faq .faq-need-list li {
  position: relative;
  padding-left: 22px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-faq .faq-need-list li::before {
  content: "";
  position: absolute;
  top: .66em;
  left: 4px;
  width: 6px;
  height: 6px;
  background: var(--cyan);
  transform: rotate(45deg);
}

.page-faq .faq-note {
  padding: 22px 20px 24px;
  border: var(--faq-line);
  border-radius: 14px;
  background: rgba(16, 31, 53, .85);
}

.page-faq .faq-note h3 {
  margin: 10px 0 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
}

.page-faq .faq-note p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mist);
}

.page-faq .faq-note__link {
  display: inline-block;
  margin-top: 14px;
  padding-bottom: 2px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cyan);
  border-bottom: 1px solid rgba(0, 227, 233, .4);
}

.page-faq .faq-note__link:hover {
  color: var(--cyan-deep);
  border-bottom-color: var(--cyan-deep);
}

/* ---------------- 断点 ---------------- */

@media (min-width: 640px) {
  .page-faq .faq-hero {
    padding: 48px 0 28px;
  }

  .page-faq .faq-hero__frame {
    padding: 40px 32px 44px;
  }

  .page-faq .faq-start,
  .page-faq .faq-qa {
    padding: 68px 0 60px;
  }

  .page-faq .faq-help {
    padding: 68px 0 80px;
  }

  .page-faq .faq-item__summary {
    grid-template-columns: 40px 1fr 20px;
    gap: 14px;
    padding: 17px 4px;
  }

  .page-faq .faq-item__q {
    font-size: 16.5px;
  }

  .page-faq .faq-group {
    padding-left: 20px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-path-grid {
    grid-template-columns: 7fr 5fr;
    gap: 30px;
    align-items: start;
  }

  .page-faq .faq-help__grid {
    grid-template-columns: 8fr 4fr;
    gap: 34px;
    align-items: start;
  }

  .page-faq .faq-steps {
    padding-left: 34px;
    gap: 22px;
  }

  .page-faq .faq-step {
    padding: 22px 26px 24px;
  }

  .page-faq .faq-step::before {
    left: -34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__summary,
  .page-faq .faq-item__mark::before,
  .page-faq .faq-item__mark::after,
  .page-faq .faq-item__num {
    transition: none;
  }
}