.page-faq {
  --faq-rail: 268px;
  --faq-anchor-gap: 96px;
  background: var(--paper);
  color: var(--line);
  font-family: var(--font-body);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 44px) 0 52px;
  background:
    radial-gradient(120% 90% at 86% 6%, rgba(47, 191, 166, 0.26) 0%, rgba(47, 191, 166, 0) 58%),
    linear-gradient(158deg, var(--ink-deep) 0%, var(--ink-green) 100%);
  color: var(--paper);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -8%;
  bottom: -70%;
  width: 44%;
  height: 180%;
  background: linear-gradient(90deg, rgba(200, 249, 75, 0.14), rgba(200, 249, 75, 0));
  transform: rotate(18deg);
  pointer-events: none;
}

.page-faq .faq-hero .breadcrumbs {
  position: relative;
  z-index: 1;
  font-size: 13px;
  letter-spacing: 0.04em;
}

.page-faq .faq-hero .breadcrumbs a,
.page-faq .faq-hero .breadcrumbs span {
  color: rgba(244, 245, 240, 0.7);
  text-decoration: none;
}

.page-faq .faq-hero .breadcrumbs a:hover,
.page-faq .faq-hero .breadcrumbs a:focus-visible {
  color: var(--lime);
}

.page-faq .faq-hero-grid {
  position: relative;
  z-index: 1;
  margin-top: 26px;
}

.page-faq .faq-hero-anno {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--lime);
}

.page-faq .faq-hero h1 {
  margin: 16px 0 18px;
  max-width: 15ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 5.6vw, 76px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-faq .faq-hero-lede {
  margin: 0;
  max-width: 58ch;
  font-size: 17px;
  line-height: 1.75;
  color: rgba(244, 245, 240, 0.8);
}

.page-faq .faq-hero-meta {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.page-faq .faq-hero-meta li {
  border-top: 2px solid rgba(200, 249, 75, 0.5);
  padding-top: 10px;
}

.page-faq .faq-meta-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-faq .faq-meta-label {
  display: block;
  margin-top: 7px;
  font-size: 12.5px;
  letter-spacing: 0.03em;
  color: rgba(244, 245, 240, 0.7);
}

/* ---------- 主体 ---------- */
.page-faq .faq-body {
  padding: 32px 0 88px;
}

.page-faq .faq-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 22px;
  margin-bottom: 26px;
  border-bottom: 1px solid var(--hui);
}

.page-faq .faq-filter .filter-chip {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1;
  padding: 10px 20px 10px 14px;
  border: 1px solid var(--hui);
  background: transparent;
  color: var(--line);
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.page-faq .faq-filter .filter-chip:hover {
  background: var(--hui);
}

.page-faq .faq-filter .filter-chip[aria-pressed="true"] {
  background: var(--ink-green);
  border-color: var(--ink-green);
  color: var(--paper);
}

.page-faq .faq-layout {
  display: grid;
  gap: 26px;
  align-items: start;
}

/* ---------- 左侧分组目录 ---------- */
.page-faq .faq-rail-title {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--stone);
}

.page-faq .faq-toc {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 4px;
  overflow-x: auto;
  max-width: 100%;
  scrollbar-width: thin;
}

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

.page-faq .faq-toc a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  white-space: nowrap;
  font-size: 14px;
  color: var(--line);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background var(--dur) var(--ease);
}

.page-faq .faq-toc a:hover,
.page-faq .faq-toc a:focus-visible {
  color: var(--ink-green);
  border-bottom-color: var(--lime);
}

.page-faq .faq-toc .num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--stone);
}

/* ---------- 问答流 ---------- */
.page-faq .faq-stream {
  display: grid;
  gap: 38px;
  min-width: 0;
}

.page-faq .faq-group {
  scroll-margin-top: calc(var(--header-h-sm) + 28px);
  --faq-accent: var(--teal);
}

.page-faq .faq-group[data-topic="schedule"] { --faq-accent: var(--lime); }
.page-faq .faq-group[data-topic="data"] { --faq-accent: var(--teal); }
.page-faq .faq-group[data-topic="roster"] { --faq-accent: var(--stone); }
.page-faq .faq-group[data-topic="screen"] { --faq-accent: var(--flame); }
.page-faq .faq-group[data-topic="collab"] { --faq-accent: var(--lime); }
.page-faq .faq-group[data-topic="contact"] { --faq-accent: var(--flame); }

.page-faq .faq-group-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 0 0 12px;
  padding: 11px 46px 11px 18px;
  max-width: 620px;
  background: linear-gradient(90deg, var(--faq-accent) 0 6px, var(--hui) 6px 100%);
  clip-path: polygon(0 0, 100% 0, calc(100% - 24px) 100%, 0 100%);
}

.page-faq .faq-group-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--line);
}

.page-faq .faq-group-index {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--stone);
}

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

.page-faq .faq-item {
  border-bottom: 1px solid var(--hui);
}

.page-faq .faq-item > summary {
  position: relative;
  list-style: none;
  cursor: pointer;
  padding: 17px 52px 17px 18px;
  font-size: 16.5px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--line);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

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

.page-faq .faq-item > summary::after {
  content: "";
  position: absolute;
  right: 22px;
  top: 50%;
  width: 10px;
  height: 10px;
  margin-top: -8px;
  border-right: 2px solid var(--stone);
  border-bottom: 2px solid var(--stone);
  transform: rotate(45deg);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-item > summary:hover {
  background: rgba(223, 226, 218, 0.5);
}

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

.page-faq .faq-item[open] > summary {
  background: linear-gradient(90deg, rgba(200, 249, 75, 0.34) 0%, rgba(200, 249, 75, 0.1) 36%, rgba(200, 249, 75, 0) 74%);
  box-shadow: inset 5px 0 0 var(--lime);
  color: var(--ink-green);
}

.page-faq .faq-item[open] > summary::after {
  transform: rotate(-135deg);
  margin-top: -3px;
  border-color: var(--ink-green);
}

.page-faq .faq-a {
  padding: 2px 52px 22px 23px;
  max-width: 70ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--line);
}

.page-faq .faq-a p {
  margin: 0 0 10px;
}

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

.page-faq .faq-metric {
  display: inline-block;
  margin: 0 2px;
  padding: 1px 8px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  background: var(--hui);
  border-left: 3px solid var(--teal);
  color: var(--line);
}

/* ---------- 配图 ---------- */
.page-faq .faq-figure {
  margin: 20px 0 0;
  padding: 0;
  background: var(--hui);
}

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

.page-faq .faq-figure .media-caption {
  padding: 10px 14px;
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--stone);
  background: var(--paper);
}

/* ---------- 结尾分组 ---------- */
.page-faq .faq-group--contact .faq-group-head {
  background: linear-gradient(90deg, var(--flame) 0 6px, var(--ink-green) 6px 100%);
}

.page-faq .faq-group--contact .faq-group-head h2 {
  color: var(--paper);
}

.page-faq .faq-group--contact .faq-group-index {
  color: rgba(244, 245, 240, 0.62);
}

.page-faq .faq-cta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: 22px;
}

.page-faq .faq-cta-row .btn {
  font-size: 15px;
  text-decoration: none;
}

.page-faq .faq-cta-row .backlink {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--stone);
  text-decoration: none;
}

.page-faq .faq-cta-row .backlink:hover,
.page-faq .faq-cta-row .backlink:focus-visible {
  color: var(--ink-green);
}

/* ---------- 桌面增强 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-hero {
    padding: calc(var(--header-h) + 72px) 0 68px;
  }

  .page-faq .faq-hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 250px;
    gap: 56px;
    align-items: end;
    margin-top: 34px;
  }

  .page-faq .faq-hero-meta {
    margin-top: 0;
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-body {
    padding: 44px 0 104px;
  }

  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: 60px;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-h-sm) + 28px);
  }

  .page-faq .faq-toc {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
    border-left: 1px solid var(--hui);
  }

  .page-faq .faq-toc li {
    flex: 0 1 auto;
  }

  .page-faq .faq-toc a {
    width: 100%;
    justify-content: flex-start;
    white-space: normal;
    margin-left: -1px;
    padding: 11px 14px;
    border-bottom: none;
    border-left: 3px solid transparent;
  }

  .page-faq .faq-toc a:hover,
  .page-faq .faq-toc a:focus-visible {
    background: rgba(223, 226, 218, 0.55);
    border-left-color: var(--lime);
    border-bottom-color: transparent;
  }

  .page-faq .faq-stream {
    gap: 48px;
  }

  .page-faq .faq-figure {
    margin-top: 26px;
  }
}

/* ---------- 窄屏 ---------- */
@media (max-width: 639px) {
  .page-faq .faq-hero {
    padding: calc(var(--header-h) + 30px) 0 42px;
  }

  .page-faq .faq-hero h1 {
    font-size: 31px;
    max-width: none;
  }

  .page-faq .faq-hero-lede {
    font-size: 15.5px;
  }

  .page-faq .faq-hero-meta {
    margin-top: 26px;
    gap: 8px;
  }

  .page-faq .faq-meta-num {
    font-size: 22px;
  }

  .page-faq .faq-meta-label {
    font-size: 11px;
    letter-spacing: 0;
  }

  .page-faq .faq-group-head {
    padding: 10px 34px 10px 14px;
    max-width: none;
  }

  .page-faq .faq-group-head h2 {
    font-size: 19px;
  }

  .page-faq .faq-item > summary {
    padding: 15px 44px 15px 14px;
    font-size: 15.5px;
  }

  .page-faq .faq-a {
    padding: 0 18px 20px 18px;
    font-size: 15px;
  }

  .page-faq .faq-figure .media-caption {
    font-size: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-filter .filter-chip,
  .page-faq .faq-toc a,
  .page-faq .faq-item > summary,
  .page-faq .faq-item > summary::after {
    transition: none;
  }
}