.page-faq {
  --faq-answer-pad: 20px;
  --faq-answer-line: 18px;
  display: block;
  background: var(--pitch-black);
  color: var(--ink);
}

.page-faq h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(32px, 6.4vw, 66px);
  line-height: 1.04;
  letter-spacing: -0.022em;
  color: var(--ink);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  padding: 26px 0 42px;
  background:
    radial-gradient(130% 96% at 100% 0%, rgba(46, 230, 200, 0.13) 0%, transparent 58%),
    radial-gradient(90% 70% at 0% 100%, rgba(242, 180, 64, 0.06) 0%, transparent 60%),
    var(--pitch-black);
  overflow: hidden;
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: 26px;
  align-items: end;
}

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

.page-faq .lede {
  margin: 18px 0 0;
  max-width: 56ch;
  color: var(--ink-2);
  font-size: clamp(15px, 1.7vw, 18px);
  line-height: 1.78;
}

.page-faq .faq-hero__figure {
  position: relative;
  margin: 0;
  min-width: 0;
}

.page-faq .faq-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  clip-path: var(--cut-clip);
  opacity: 0.6;
}

.page-faq .faq-hero__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  clip-path: var(--cut-clip);
  background: linear-gradient(180deg, transparent 38%, var(--pitch-black) 100%);
  pointer-events: none;
}

@media (min-width: 960px) {
  .page-faq .faq-hero {
    padding-bottom: 56px;
  }
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: 54px;
    padding-top: 18px;
  }
  .page-faq .faq-hero__figure::after {
    background: linear-gradient(90deg, var(--pitch-black) 0%, transparent 52%);
  }
}

/* ---------- 问题索引 ---------- */

.page-faq .faq-index {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin-top: 36px;
  padding-top: 20px;
  border-top: 1px solid var(--hairline);
}

.page-faq .chapter-link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 13px 16px;
  background: var(--panel);
  border-left: 2px solid transparent;
  clip-path: var(--cut-clip);
  color: var(--ink-2);
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 16px;
  line-height: 1.4;
  transition: background 0.25s var(--ease-out), color 0.25s var(--ease-out), border-color 0.25s var(--ease-out);
}

.page-faq .chapter-link .idx {
  color: var(--cyan);
  flex: 0 0 auto;
}

.page-faq .chapter-link__t {
  min-width: 0;
}

.page-faq .chapter-link:hover,
.page-faq .chapter-link:focus-visible {
  background: var(--panel-raised);
  border-left-color: var(--cyan);
  color: var(--ink);
}

.page-faq .chapter-link.is-active {
  background: var(--panel-raised);
  border-left-color: var(--cyan);
  color: var(--ink);
}

.page-faq .chapter-link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -3px;
}

@media (min-width: 620px) {
  .page-faq .faq-index {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1040px) {
  .page-faq .faq-index {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 问题分组 ---------- */

.page-faq .faq-group {
  padding: 48px 0;
  border-top: 1px solid var(--hairline);
}

.page-faq .faq-group--band {
  background: var(--deep-green);
}

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

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

.page-faq .faq-group__head h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(25px, 4.2vw, 39px);
  line-height: 1.12;
  letter-spacing: -0.012em;
  color: var(--ink);
}

.page-faq .faq-group__note {
  margin: 12px 0 0;
  max-width: 36ch;
  color: var(--ink-2);
  font-size: 15px;
  line-height: 1.72;
}

.page-faq .faq-figure {
  margin: 24px 0 0;
  position: relative;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  clip-path: var(--cut-clip);
  opacity: 0.66;
}

@media (min-width: 1000px) {
  .page-faq .faq-group {
    padding: 64px 0;
  }
  .page-faq .faq-group__inner {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: 54px;
    align-items: start;
  }
  .page-faq .faq-group__head {
    position: sticky;
    top: 84px;
  }
}

/* ---------- 问答条目 ---------- */

.page-faq .faq-list {
  display: grid;
  gap: 12px;
  min-width: 0;
}

.page-faq .faq-item {
  position: relative;
  min-width: 0;
  background: var(--panel);
  border-left: 2px solid var(--hairline);
  clip-path: var(--cut-clip);
  transition: background 0.25s var(--ease-out), border-color 0.25s var(--ease-out);
}

.page-faq .faq-item:hover,
.page-faq .faq-item[open] {
  background: var(--panel-raised);
  border-left-color: var(--cyan);
}

.page-faq .faq-item > summary {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 17px var(--faq-answer-pad);
  cursor: pointer;
  list-style: none;
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(17px, 1.7vw, 20px);
  line-height: 1.42;
  letter-spacing: -0.004em;
}

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

.page-faq .faq-item > summary::marker {
  content: "";
}

.page-faq .faq-item > summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -4px;
}

.page-faq .faq-item__idx {
  flex: 0 0 auto;
  padding-top: 5px;
  color: var(--cyan);
  font-size: 12px;
  letter-spacing: 0.14em;
}

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

.page-faq .faq-item__mark {
  flex: 0 0 auto;
  position: relative;
  align-self: center;
  margin-left: auto;
  width: 20px;
  height: 20px;
  border: 1px solid var(--hairline);
  transition: border-color 0.25s var(--ease-out);
}

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

.page-faq .faq-item__mark::before {
  width: 10px;
  height: 2px;
}

.page-faq .faq-item__mark::after {
  width: 2px;
  height: 10px;
}

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

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

.page-faq .faq-item__a {
  margin: 0 var(--faq-answer-pad) 20px;
  padding-left: var(--faq-answer-line);
  border-left: 1px solid var(--hairline);
  animation: faq-answer-in 0.32s var(--ease-out) both;
}

.page-faq .faq-item__a p {
  margin: 0 0 10px;
  color: var(--ink-2);
  font-size: 16px;
  line-height: 1.78;
}

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

.page-faq .faq-item__act {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

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

/* ---------- 联系信息条 ---------- */

.page-faq .faq-contact {
  margin-top: 24px;
  padding: 20px var(--faq-answer-pad);
  background: var(--panel-raised);
  border-left: 2px solid var(--amber);
  clip-path: var(--cut-clip);
  min-width: 0;
}

.page-faq .faq-contact .idx {
  color: var(--amber);
}

.page-faq .faq-contact__mail {
  margin: 10px 0 6px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(15px, 2.4vw, 19px);
  letter-spacing: 0.01em;
  color: var(--cyan);
  word-break: break-all;
}

.page-faq .faq-contact__meta {
  margin: 0;
  color: var(--ink-3);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
}

@media (min-width: 1000px) {
  .page-faq .faq-contact {
    grid-column: 2 / -1;
  }
}

/* ---------- 无障碍与动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__a {
    animation: none;
  }
  .page-faq .faq-item,
  .page-faq .chapter-link,
  .page-faq .faq-item__mark,
  .page-faq .faq-item__mark::before,
  .page-faq .faq-item__mark::after {
    transition: none;
  }
}