.page-faq {
  --faq-radius: 12px;
  --faq-panel: linear-gradient(180deg, rgba(22, 64, 52, .62), rgba(14, 42, 34, .62));
  position: relative;
  padding-top: clamp(84px, 10vw, 120px);
  padding-bottom: clamp(64px, 8vw, 104px);
  background:
    radial-gradient(90% 46% at 6% -8%, rgba(201, 255, 61, .09), transparent 58%),
    radial-gradient(78% 42% at 98% 2%, rgba(255, 106, 43, .07), transparent 56%),
    linear-gradient(180deg, var(--ink) 0%, #0B1412 46%, var(--ink) 100%);
  color: var(--fog);
  font-family: var(--font-body);
}

/* ---------- 面包屑 ---------- */
.page-faq .crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: 20px;
  font-size: 13px;
  color: var(--silver);
}
.page-faq .crumbs a {
  color: var(--silver);
  text-decoration: none;
  transition: color .2s ease;
}
.page-faq .crumbs a:hover { color: var(--lime); }
.page-faq .crumbs .crumb-sep { color: var(--line); }
.page-faq .crumbs [aria-current="page"] { color: var(--fog); }

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 44px);
  padding-top: clamp(24px, 4vw, 46px);
  padding-bottom: clamp(36px, 5vw, 66px);
}
.page-faq .faq-hero h1 {
  margin: 14px 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 5.4vw, 62px);
  line-height: 1.07;
  letter-spacing: -0.01em;
  color: var(--fog);
}
.page-faq .faq-hero .lead {
  max-width: 58ch;
  color: var(--silver);
  font-size: clamp(15px, 1.2vw, 17px);
  line-height: 1.78;
}

.page-faq .faq-hero-stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(24px, 3vw, 34px);
  border: 1px solid var(--line);
  border-radius: var(--faq-radius);
  overflow: hidden;
  background: var(--line);
}
.page-faq .faq-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: var(--ink-2);
}
.page-faq .faq-stat-num {
  font-size: 22px;
  font-weight: 700;
  color: var(--lime);
  letter-spacing: -0.01em;
}
.page-faq .faq-stat-label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--silver);
}

.page-faq .faq-hero-figure {
  margin: 0;
}
.page-faq .faq-hero-figure .figure-media {
  aspect-ratio: 3 / 2;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--line);
}
.page-faq .faq-hero-figure .figure-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-faq .faq-hero-figure .figure-caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--silver);
}

/* ---------- 主体骨架 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 40px);
}

/* ---------- 分类锚点 ---------- */
.page-faq .faq-rail {
  border: 1px solid var(--line);
  border-radius: var(--faq-radius);
  background: linear-gradient(180deg, var(--ink-2), rgba(10, 15, 14, .88));
  padding: 16px 14px;
}
.page-faq .faq-rail-label {
  margin: 0 0 10px;
  font-size: 11.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--teal);
}
.page-faq .faq-rail-nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: thin;
}
.page-faq .faq-rail-nav a.chapter-link {
  position: relative;
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 7px;
  padding: 9px 12px;
  border: 1px solid transparent;
  border-radius: 10px;
  color: var(--silver);
  font-size: 13px;
  line-height: 1.3;
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s ease, background .2s ease, border-color .2s ease;
}
.page-faq .faq-rail-nav a.chapter-link .mono {
  font-size: 11.5px;
  color: var(--line);
  transition: color .2s ease;
}
.page-faq .faq-rail-nav a.chapter-link:hover {
  color: var(--fog);
  background: rgba(201, 255, 61, .07);
}
.page-faq .faq-rail-nav a.chapter-link[aria-current="location"] {
  color: var(--lime);
  background: rgba(201, 255, 61, .1);
  border-color: rgba(201, 255, 61, .34);
}
.page-faq .faq-rail-nav a.chapter-link[aria-current="location"] .mono { color: var(--lime); }

.page-faq .to-top {
  display: none;
}

/* ---------- 问答流 ---------- */
.page-faq .faq-stream {
  min-width: 0;
}
.page-faq .faq-group {
  margin-bottom: clamp(44px, 6vw, 76px);
  scroll-margin-top: calc(var(--header-h) + 16px);
}
.page-faq .faq-group--last {
  margin-bottom: 0;
}
.page-faq .faq-group-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 8px 14px;
  padding-top: 16px;
  margin-bottom: 20px;
  border-top: 2px solid var(--line);
}
.page-faq .faq-group-num {
  padding: 3px 9px;
  border: 1px solid var(--line);
  border-radius: 7px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--lime);
}
.page-faq .faq-group-head .t-2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 2.6vw, 32px);
  line-height: 1.2;
  color: var(--fog);
}
.page-faq .faq-group-desc {
  grid-column: 1 / -1;
  margin: 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.7;
  color: var(--silver);
}

/* ---------- 问答卡 ---------- */
.page-faq .faq-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}
.page-faq .qa {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--faq-radius);
  background: var(--faq-panel);
  overflow: hidden;
  transition: border-color .22s ease, background .22s ease;
}
.page-faq .qa::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 18px;
  height: 18px;
  background: linear-gradient(225deg, rgba(201, 255, 61, .22) 0 48%, transparent 50%);
  pointer-events: none;
}
.page-faq .qa:hover { border-color: rgba(201, 255, 61, .58); }
.page-faq .qa[open] {
  border-color: rgba(201, 255, 61, .62);
  background: linear-gradient(180deg, rgba(22, 64, 52, .92), rgba(10, 15, 14, .78));
}
.page-faq .qa > summary {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--fog);
  transition: color .2s ease;
}
.page-faq .qa > summary::-webkit-details-marker { display: none; }
.page-faq .qa > summary::marker { content: ""; }
.page-faq .qa > summary:hover { color: var(--lime); }
.page-faq .qa-q { min-width: 0; }
.page-faq .qa-icon {
  position: relative;
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  margin-top: 3px;
  margin-left: auto;
  border: 1px solid var(--line);
  border-radius: 50%;
  transition: transform .26s ease, border-color .26s ease;
}
.page-faq .qa-icon::before,
.page-faq .qa-icon::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--lime);
  border-radius: 1px;
}
.page-faq .qa-icon::before {
  width: 8px;
  height: 1.5px;
  transform: translate(-50%, -50%);
}
.page-faq .qa-icon::after {
  width: 1.5px;
  height: 8px;
  transform: translate(-50%, -50%);
}
.page-faq .qa[open] .qa-icon {
  transform: rotate(45deg);
  border-color: var(--orange);
}
.page-faq .qa[open] .qa-icon::before,
.page-faq .qa[open] .qa-icon::after { background: var(--orange); }

.page-faq .qa-body {
  padding: 13px 16px 16px;
  border-top: 1px dashed var(--line);
  font-size: 14px;
  line-height: 1.78;
  color: var(--silver);
}
.page-faq .qa-answer { margin: 0; }
.page-faq .qa-answer strong {
  font-weight: 700;
  color: var(--fog);
}

/* ---------- 纠错区特殊布局 ---------- */
.page-faq .faq-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-bottom: 12px;
}
.page-faq .faq-figure { margin: 0; }
.page-faq .faq-figure .figure-media {
  aspect-ratio: 4 / 3;
  border-radius: var(--faq-radius);
  overflow: hidden;
  border: 1px solid var(--line);
}
.page-faq .faq-figure .figure-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-faq .faq-figure .figure-caption {
  margin-top: 9px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--silver);
}
.page-faq .faq-split-copy {
  border: 1px solid var(--line);
  border-radius: var(--faq-radius);
  background: linear-gradient(135deg, rgba(28, 34, 38, .9), rgba(14, 42, 34, .72));
  padding: 18px 18px 20px;
}
.page-faq .faq-split-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 17px;
  letter-spacing: .01em;
  color: var(--fog);
}
.page-faq .faq-checklist {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 9px;
}
.page-faq .faq-checklist li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--silver);
}
.page-faq .faq-checklist li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 8px;
  width: 8px;
  height: 8px;
  border-left: 2px solid var(--lime);
  border-bottom: 2px solid var(--lime);
  transform: rotate(-45deg);
}
.page-faq .faq-split-note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.65;
  color: var(--teal);
}

/* ---------- 联系面板 ---------- */
.page-faq .faq-contact-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: var(--faq-radius);
  overflow: hidden;
  background: var(--line);
}
.page-faq .faq-contact-cell {
  padding: 18px 18px 20px;
  background: var(--ink-2);
}
.page-faq .faq-contact-label {
  margin: 0 0 8px;
  font-size: 11.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--teal);
}
.page-faq .faq-contact-value {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(17px, 1.8vw, 21px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--fog);
  word-break: break-word;
}
.page-faq .faq-contact-value--mail {
  font-family: var(--font-mono);
  font-size: clamp(13px, 1.35vw, 16px);
  font-weight: 500;
  letter-spacing: -0.01em;
}
.page-faq .faq-contact-hint {
  margin: 8px 0 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--silver);
}

.page-faq .faq-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  align-items: center;
  margin-top: 16px;
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--lime);
  border-radius: var(--faq-radius);
  background: linear-gradient(120deg, rgba(28, 34, 38, .92), rgba(14, 42, 34, .62));
}
.page-faq .faq-cta-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--silver);
}
.page-faq .faq-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-faq .faq-cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: 22px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}
.page-faq .faq-cta-links a {
  position: relative;
  font-size: 13.5px;
  color: var(--silver);
  text-decoration: none;
  transition: color .2s ease;
}
.page-faq .faq-cta-links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -3px;
  height: 1px;
  background: var(--line);
  transition: background .2s ease;
}
.page-faq .faq-cta-links a:hover { color: var(--lime); }
.page-faq .faq-cta-links a:hover::after { background: var(--lime); }

/* ---------- 窄屏优先的渐进增强 ---------- */
@media (min-width: 560px) {
  .page-faq .faq-hero-stats { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-faq .faq-contact-panel { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-faq .faq-split { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .page-faq .faq-cta { grid-template-columns: minmax(0, 1fr) auto; }
}

@media (min-width: 760px) {
  .page-faq .faq-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
  .page-faq .qa-wide { grid-column: 1 / -1; }
}

@media (min-width: 940px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    align-items: center;
    gap: clamp(36px, 5vw, 72px);
    padding-top: clamp(34px, 4vw, 56px);
  }
  .page-faq .faq-hero-figure {
    transform: rotate(-1.1deg);
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-body {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 54px);
    align-items: start;
  }
  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-h) + 8px);
    align-self: start;
  }
  .page-faq .faq-rail-nav {
    flex-direction: column;
    overflow: visible;
    gap: 2px;
    padding-bottom: 0;
  }
  .page-faq .faq-rail-nav a.chapter-link {
    width: 100%;
    white-space: normal;
    padding: 9px 10px 9px 14px;
    border: none;
    border-radius: 8px;
  }
  .page-faq .faq-rail-nav a.chapter-link::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 3px;
    height: 0;
    border-radius: 2px;
    background: var(--lime);
    transform: translateY(-50%);
    transition: height .24s ease;
  }
  .page-faq .faq-rail-nav a.chapter-link[aria-current="location"]::before { height: 58%; }
  .page-faq .faq-rail-nav a.chapter-link[aria-current="location"] {
    background: rgba(201, 255, 61, .08);
    border-color: transparent;
  }
  .page-faq .to-top {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    margin-top: 14px;
    padding: 9px 12px;
    border: 1px solid var(--line);
    border-radius: var(--radius-pill);
    background: transparent;
    color: var(--silver);
    font-family: var(--font-body);
    font-size: 12.5px;
    cursor: pointer;
    opacity: 0;
    pointer-events: none;
    transition: opacity .24s ease, color .2s ease, border-color .2s ease;
  }
  .page-faq .to-top[data-visible="true"] {
    opacity: 1;
    pointer-events: auto;
  }
  .page-faq .to-top:hover {
    color: var(--lime);
    border-color: var(--lime);
  }
}

@media (min-width: 1240px) {
  .page-faq .faq-body { grid-template-columns: 232px minmax(0, 1fr); }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa-icon,
  .page-faq .faq-rail-nav a.chapter-link,
  .page-faq .faq-rail-nav a.chapter-link::before,
  .page-faq .to-top {
    transition: none;
  }
  .page-faq .faq-hero-figure { transform: none; }
}
</main>