.page-faq {
  --faq-accent: var(--signal-cyan);
  --faq-sticky-top: 7rem;
  padding-block: var(--space-m) var(--space-l);
  color: var(--paper-white);
}

/* 面包屑 */
.page-faq .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .35rem;
  margin: 0 0 var(--space-m);
  padding: 0;
  list-style: none;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--chalk-grey);
}
.page-faq .breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
}
.page-faq .breadcrumb li + li::before {
  content: "/";
  color: var(--paper-16);
}
.page-faq .breadcrumb a {
  color: var(--paper-72);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-faq .breadcrumb a:hover,
.page-faq .breadcrumb a:focus-visible {
  color: var(--signal-cyan);
  border-bottom-color: currentColor;
}
.page-faq .breadcrumb [aria-current="page"] {
  color: var(--paper-white);
}

/* 首屏 */
.page-faq .faq-hero {
  position: relative;
  padding-bottom: var(--space-m);
  border-bottom: var(--line);
  background-image:
    radial-gradient(58% 92% at 90% 2%, rgba(70, 227, 196, .10), transparent 68%),
    radial-gradient(48% 84% at 0% 14%, rgba(27, 33, 69, .85), transparent 72%);
  background-repeat: no-repeat;
}
.page-faq .faq-hero__grid {
  align-items: center;
  row-gap: var(--space-m);
}
.page-faq .faq-hero__kicker {
  margin: 0 0 .85rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--signal-cyan);
}
.page-faq h1 {
  margin: 0 0 1.1rem;
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 9vw, 5.25rem);
  font-weight: 700;
  line-height: .94;
  letter-spacing: -.02em;
  color: var(--paper-white);
}
.page-faq .faq-hero__lede {
  max-width: 48ch;
  margin: 0 0 1.5rem;
  font-size: clamp(1rem, 1.6vw, 1.12rem);
  line-height: 1.8;
  color: var(--paper-72);
}
.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem .6rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-faq .faq-hero__meta li {
  padding: .38rem .65rem;
  border: var(--line);
  background: rgba(16, 35, 28, .62);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--paper-55);
}
.page-faq .faq-hero__meta .num {
  color: var(--paper-white);
}
.page-faq .faq-hero__media {
  min-width: 0;
}
.page-faq .faq-hero__media .media-frame {
  border: var(--line);
  box-shadow: 6px 6px 0 rgba(27, 33, 69, .7);
}

/* 主布局 */
.page-faq .faq-layout {
  margin-top: var(--space-l);
  row-gap: var(--space-l);
  align-items: start;
}
.page-faq .faq-rail {
  min-width: 0;
}
.page-faq .faq-rail__nav {
  padding: 1rem 1.05rem 1.15rem;
  border: var(--line);
  background: var(--jewel-indigo);
  box-shadow: 6px 6px 0 rgba(11, 14, 13, .85);
}
.page-faq .faq-rail__title {
  margin: 0 0 .75rem;
  padding-bottom: .6rem;
  border-bottom: var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--chalk-grey);
}
.page-faq .faq-rail__list {
  display: grid;
  gap: .1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-faq .faq-rail__list a {
  display: flex;
  align-items: baseline;
  gap: .6rem;
  padding: .5rem .55rem;
  border-left: 2px solid transparent;
  font-size: 14px;
  line-height: 1.5;
  color: var(--paper-72);
  text-decoration: none;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-faq .faq-rail__list a .num {
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--chalk-grey);
  transition: color var(--dur) var(--ease);
}
.page-faq .faq-rail__list a:hover,
.page-faq .faq-rail__list a:focus-visible {
  color: var(--paper-white);
  background: rgba(242, 239, 231, .06);
}
.page-faq .faq-rail__list a[aria-current="true"] {
  color: var(--signal-cyan);
  border-left-color: var(--signal-cyan);
  background: rgba(70, 227, 196, .09);
}
.page-faq .faq-rail__list a[aria-current="true"] .num {
  color: var(--signal-cyan);
}

/* 问答分组 */
.page-faq .faq-body {
  display: grid;
  gap: var(--space-l);
  min-width: 0;
}
.page-faq .faq-group {
  scroll-margin-top: var(--faq-sticky-top);
  min-width: 0;
}
.page-faq .faq-group--cyan { --faq-accent: var(--signal-cyan); }
.page-faq .faq-group--orange { --faq-accent: var(--alert-orange); }
.page-faq .faq-group--brocade { --faq-accent: var(--brocade-red-lite); }
.page-faq .faq-group--chalk { --faq-accent: var(--chalk-grey); }

.page-faq .faq-group__head {
  display: grid;
  gap: .45rem;
  margin-bottom: 1.15rem;
  padding-bottom: .9rem;
  border-bottom: var(--line);
}
.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--faq-accent);
}
.page-faq .faq-group__head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4vw, 2.15rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -.01em;
  color: var(--paper-white);
}
.page-faq .faq-group__lede {
  max-width: 58ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--paper-55);
}

/* 折叠卡片 */
.page-faq .faq-item {
  position: relative;
  margin-bottom: .55rem;
  border: var(--line);
  background: linear-gradient(180deg, rgba(16, 35, 28, .92), rgba(11, 14, 13, .92));
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.page-faq .faq-item:hover {
  border-color: rgba(70, 227, 196, .35);
}
.page-faq .faq-item[open] {
  box-shadow: inset 2px 0 0 var(--faq-accent);
}
.page-faq .faq-item__q {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: .8rem;
  align-items: start;
  margin: 0;
  padding: .95rem 1rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: clamp(1rem, 2.2vw, 1.12rem);
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: -.005em;
  color: var(--paper-white);
  transition: color var(--dur) var(--ease);
}
.page-faq .faq-item__q::-webkit-details-marker {
  display: none;
}
.page-faq .faq-item__q::marker {
  content: "";
}
.page-faq .faq-item__q:focus-visible {
  outline: 2px solid var(--signal-cyan);
  outline-offset: 2px;
}
.page-faq .faq-item__plus {
  position: relative;
  width: 16px;
  height: 16px;
  margin-top: .3rem;
  flex: none;
  border: 1px solid var(--faq-accent);
  transition: transform var(--dur-slow) var(--ease), background-color var(--dur) var(--ease);
}
.page-faq .faq-item__plus::before,
.page-faq .faq-item__plus::after {
  content: "";
  position: absolute;
  background: var(--faq-accent);
}
.page-faq .faq-item__plus::before {
  left: 50%;
  top: 2px;
  bottom: 2px;
  width: 1px;
  transform: translateX(-50%);
}
.page-faq .faq-item__plus::after {
  top: 50%;
  left: 2px;
  right: 2px;
  height: 1px;
  transform: translateY(-50%);
}
.page-faq .faq-item[open] .faq-item__plus {
  transform: rotate(45deg);
}
.page-faq .faq-item[open] .faq-item__body {
  animation: faq-reveal var(--dur-slow) var(--ease) both;
}
@keyframes faq-reveal {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: none; }
}
.page-faq .faq-item__body {
  padding: 0 1rem 1.05rem 1rem;
  font-size: 15px;
  line-height: 1.8;
  color: var(--paper-72);
}
.page-faq .faq-item__body p {
  margin: 0 0 .7rem;
}
.page-faq .faq-item__body p:last-of-type {
  margin-bottom: 0;
}
.page-faq .faq-item__tags {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin-top: .85rem;
}

/* 相关栏目 */
.page-faq .faq-group__next {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .4rem .9rem;
  margin-top: 1rem;
  padding-top: .85rem;
  border-top: 1px dashed var(--grid-line);
  font-size: 13px;
  color: var(--chalk-grey);
}
.page-faq .faq-group__next a {
  color: var(--faq-accent);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
}
.page-faq .faq-group__next a:hover,
.page-faq .faq-group__next a:focus-visible {
  color: var(--paper-white);
}

/* 插图 */
.page-faq .faq-figure {
  margin: 1.4rem 0 0;
  border: var(--line);
  box-shadow: 6px 6px 0 rgba(27, 33, 69, .6);
}

/* 术语表 */
.page-faq .glossary-wrap {
  overflow-x: auto;
  border: var(--line);
  background: rgba(16, 35, 28, .5);
}
.page-faq .glossary {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: 14px;
}
.page-faq .glossary caption {
  padding: .8rem 1rem;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--chalk-grey);
  border-bottom: var(--line);
}
.page-faq .glossary th,
.page-faq .glossary td {
  padding: .72rem .9rem;
  text-align: left;
  vertical-align: top;
  border-bottom: var(--line);
}
.page-faq .glossary thead th {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--chalk-grey);
  background: rgba(11, 14, 13, .7);
}
.page-faq .glossary tbody th {
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--paper-white);
  white-space: nowrap;
}
.page-faq .glossary tbody td {
  line-height: 1.7;
  color: var(--paper-72);
}
.page-faq .glossary tbody td.num {
  color: var(--signal-cyan);
  white-space: nowrap;
}
.page-faq .glossary tbody tr:last-child th,
.page-faq .glossary tbody tr:last-child td {
  border-bottom: 0;
}
.page-faq .glossary tbody tr:hover {
  background: rgba(70, 227, 196, .06);
}

/* 页尾延伸目录 */
.page-faq .faq-next {
  margin-top: var(--space-l);
  padding-top: var(--space-m);
  border-top: var(--line);
}
.page-faq .faq-next__title {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--chalk-grey);
}
.page-faq .faq-next__list {
  display: grid;
  gap: .6rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-faq .faq-next__item a {
  display: grid;
  gap: .25rem;
  padding: .9rem 1rem;
  border: var(--line);
  background: rgba(27, 33, 69, .6);
  color: var(--paper-white);
  text-decoration: none;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.page-faq .faq-next__item a:hover,
.page-faq .faq-next__item a:focus-visible {
  transform: translateY(-2px);
  border-color: var(--signal-cyan);
  background: rgba(27, 33, 69, .9);
}
.page-faq .faq-next__num {
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--signal-cyan);
}
.page-faq .faq-next__name {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -.005em;
}
.page-faq .faq-next__desc {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--paper-55);
}

/* 桌面增强 */
@media (min-width: 760px) {
  .page-faq .faq-item__body {
    padding: 0 1.15rem 1.1rem 3.1rem;
  }
  .page-faq .faq-group__head {
    grid-template-columns: 4.5rem minmax(0, 1fr);
    grid-template-areas:
      "num title"
      "num lede";
    column-gap: 1rem;
    align-items: baseline;
  }
  .page-faq .faq-group__num { grid-area: num; }
  .page-faq .faq-group__head h2 { grid-area: title; }
  .page-faq .faq-group__lede { grid-area: lede; }

  .page-faq .faq-next__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: .8rem;
  }
}

@media (min-width: 901px) {
  .page-faq .faq-rail__nav {
    position: sticky;
    top: var(--faq-sticky-top);
  }
  .page-faq .faq-hero__text {
    padding-right: 2rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item[open] .faq-item__body {
    animation: none;
  }
  .page-faq .faq-item__plus,
  .page-faq .faq-next__item a {
    transition: none;
  }
  .page-faq .faq-next__item a:hover {
    transform: none;
  }
}
</main>