/* ============================================================
   常见问答 /faqs/
   ============================================================ */

.page-faq {
  --faq-line: rgba(246, 242, 231, .12);
  --faq-tint: rgba(23, 57, 46, .55);
  --faq-orange-tint: rgba(255, 106, 24, .12);
  --faq-blue-tint: rgba(53, 210, 255, .07);
}

/* ---------- 页头 ---------- */

.page-faq .faq-head {
  position: relative;
  overflow: hidden;
  padding: clamp(2rem, 5vw, 3.5rem) 0 clamp(1.75rem, 3.6vw, 2.75rem);
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-head::after {
  content: "";
  position: absolute;
  right: -8%;
  bottom: -78%;
  width: min(520px, 72vw);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(53, 210, 255, .14), transparent 68%);
  pointer-events: none;
}

.page-faq .faq-head__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(1.1rem, 3vw, 2rem);
}

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

.page-faq .faq-head__title {
  font-family: var(--font-head);
  font-size: var(--fs-88);
  line-height: .92;
  letter-spacing: -.03em;
  margin: .4rem 0 0;
  color: var(--paper);
}

.page-faq .faq-head__body {
  display: grid;
  gap: .85rem;
  align-content: end;
  min-width: 0;
}

.page-faq .faq-head__note {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 0;
  font-size: var(--fs-14);
  color: var(--paper-2);
}

@media (min-width: 880px) {
  .page-faq .faq-head__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-faq .faq-head__body {
    border-left: 1px solid var(--faq-line);
    padding-left: clamp(1.25rem, 3vw, 2.25rem);
  }
}

/* ---------- 置顶三条 ---------- */

.page-faq .faq-quick {
  padding: clamp(2rem, 4.6vw, 3.25rem) 0;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-quick__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .5rem 1.5rem;
  margin-bottom: 1.25rem;
}

.page-faq .faq-quick__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: var(--fs-40);
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-faq .faq-quick__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--faq-line);
  border: 1px solid var(--faq-line);
}

.page-faq .faq-quick__item {
  position: relative;
  padding: 1.6rem 1.35rem 1.75rem;
  background: linear-gradient(180deg, rgba(23, 57, 46, .88), rgba(14, 42, 34, .94));
}

.page-faq .faq-quick__item::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--orange), rgba(255, 106, 24, 0));
}

.page-faq .faq-quick__num {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .14em;
  color: var(--orange);
}

.page-faq .faq-quick__item h3 {
  margin: .55rem 0 .5rem;
  font-family: var(--font-head);
  font-size: var(--fs-20);
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-faq .faq-quick__item p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--paper-2);
}

.page-faq .faq-quick__item strong {
  color: var(--orange);
  font-weight: 600;
}

@media (min-width: 780px) {
  .page-faq .faq-quick__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 分组问答 ---------- */

.page-faq .faq-ask {
  padding: clamp(2.25rem, 5vw, 3.5rem) 0 clamp(1.5rem, 3vw, 2.5rem);
}

.page-faq .faq-ask__head {
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

.page-faq .faq-ask__title {
  margin: .35rem 0 0;
  font-family: var(--font-head);
  font-size: var(--fs-40);
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-faq .faq-tabs__layout {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
}

.page-faq .faq-tabs__rail,
.page-faq .faq-tabs__panels,
.page-faq .faq-panel {
  min-width: 0;
}

/* 分组导航 */

.page-faq .faq-tabs__tablist {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--faq-line);
  border: 1px solid var(--faq-line);
}

.page-faq .faq-tab {
  appearance: none;
  -webkit-appearance: none;
  border: 0;
  margin: 0;
  background: rgba(7, 19, 15, .74);
  color: var(--paper-2);
  font-family: var(--font-head);
  font-size: var(--fs-20);
  letter-spacing: -.01em;
  line-height: 1.25;
  text-align: left;
  white-space: nowrap;
  padding: 1rem 1.1rem 1rem 1.65rem;
  position: relative;
  cursor: pointer;
  transition: color .18s var(--ease), background .18s var(--ease);
}

.page-faq .faq-tab::before {
  content: "";
  position: absolute;
  left: 1rem;
  top: 50%;
  width: 5px;
  height: 5px;
  margin-top: -2.5px;
  background: var(--line-strong);
  transition: background .18s var(--ease), transform .18s var(--ease);
}

.page-faq .faq-tab:hover {
  color: var(--paper);
  background: rgba(23, 57, 46, .82);
}

.page-faq .faq-tab[aria-selected="true"] {
  color: var(--paper);
  background: linear-gradient(90deg, var(--faq-orange-tint), rgba(23, 57, 46, .85));
}

.page-faq .faq-tab[aria-selected="true"]::before {
  background: var(--orange);
  transform: scale(1.5);
}

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

@media (max-width: 899px) {
  .page-faq .faq-tabs__tablist {
    flex-direction: row;
    overflow-x: auto;
    overscroll-behavior-x: contain;
    scrollbar-width: none;
  }

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

  .page-faq .faq-tab {
    flex: 0 0 auto;
    font-size: var(--fs-16);
    padding: .85rem 1rem;
  }

  .page-faq .faq-tab::before {
    display: none;
  }

  .page-faq .faq-tab[aria-selected="true"] {
    background: var(--faq-orange-tint);
    box-shadow: inset 0 -2px 0 var(--orange);
  }
}

@media (min-width: 900px) {
  .page-faq .faq-tabs__layout {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: clamp(1.75rem, 3.5vw, 3rem);
    align-items: start;
  }

  .page-faq .faq-tabs__rail {
    position: sticky;
    top: 104px;
  }
}

/* 面板 */

.page-faq .faq-panel__title {
  margin: 0 0 .35rem;
  font-family: var(--font-head);
  font-size: var(--fs-28);
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-faq .faq-panel__note {
  margin: 0 0 1.25rem;
  max-width: 62ch;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--paper-2);
}

/* 入口示意图 */

.page-faq .faq-tip {
  display: grid;
  gap: 1rem;
  margin: 0 0 1.5rem;
  padding: 1rem;
  border: 1px solid var(--faq-line);
  background: var(--faq-blue-tint);
}

.page-faq .faq-tip img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--faq-line);
}

.page-faq .faq-tip__text {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--paper-2);
}

@media (min-width: 720px) {
  .page-faq .faq-tip {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: center;
    gap: 1.5rem;
    padding: 1.25rem;
  }
}

/* 问答条目 */

.page-faq .qa {
  border-top: 1px solid var(--faq-line);
}

.page-faq .qa:last-of-type {
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .qa > summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem .2rem;
  font-family: var(--font-head);
  font-size: var(--fs-20);
  letter-spacing: -.01em;
  line-height: 1.35;
  color: var(--paper);
  transition: color .18s var(--ease);
}

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

.page-faq .qa > summary:hover {
  color: var(--blue);
}

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

.page-faq .qa > summary::after {
  content: "";
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  margin-top: .45rem;
  border-right: 2px solid var(--orange);
  border-bottom: 2px solid var(--orange);
  transform: rotate(45deg);
  transition: transform .2s var(--ease);
}

.page-faq .qa[open] > summary::after {
  transform: rotate(-135deg);
}

.page-faq .qa__body {
  max-width: 68ch;
  padding: 0 0 1.35rem;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--paper-2);
}

.page-faq .qa__body p {
  margin: 0 0 .7rem;
}

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

.page-faq .qa__body strong {
  color: var(--blue);
  font-weight: 600;
}

.page-faq .qa__body a {
  color: var(--blue);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  text-decoration-color: rgba(53, 210, 255, .42);
  transition: text-decoration-color .18s var(--ease);
}

.page-faq .qa__body a:hover {
  text-decoration-color: var(--blue);
}

/* ---------- 中段图像带 ---------- */

.page-faq .faq-band {
  position: relative;
  margin: clamp(2rem, 5vw, 3.5rem) 0 0;
  overflow: hidden;
  background: var(--ink-2);
  border-top: 1px solid var(--faq-line);
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-band img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: clamp(150px, 24vw, 280px);
  object-fit: cover;
  opacity: .48;
}

.page-faq .faq-band__cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 1.1rem clamp(1rem, 4vw, 2.75rem);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .16em;
  color: var(--paper-2);
  background: linear-gradient(180deg, rgba(7, 19, 15, 0), rgba(7, 19, 15, .92));
}

/* ---------- 底部联系带 ---------- */

.page-faq .faq-help {
  padding: clamp(2.25rem, 5vw, 3.5rem) 0;
  background: linear-gradient(140deg, rgba(23, 57, 46, .9), rgba(7, 19, 15, .96) 62%);
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-help__inner {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
}

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

.page-faq .faq-help h2 {
  margin: .35rem 0 .6rem;
  font-family: var(--font-head);
  font-size: var(--fs-40);
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-faq .faq-help__lead p {
  margin: 0 0 1.25rem;
  max-width: 48ch;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--paper-2);
}

.page-faq .faq-help__channels {
  display: grid;
  gap: 1px;
  margin: 0;
  background: var(--faq-line);
  border: 1px solid var(--faq-line);
}

.page-faq .faq-help__channels > div {
  padding: 1rem 1.1rem;
  background: rgba(7, 19, 15, .58);
}

.page-faq .faq-help__channels dt {
  margin-bottom: .35rem;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .12em;
  color: var(--orange);
}

.page-faq .faq-help__channels dd {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

@media (min-width: 560px) {
  .page-faq .faq-help__channels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-help__inner {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: start;
  }
}