.page-faq {
  --faq-line: rgba(143, 163, 191, 0.22);
  --faq-line-soft: rgba(143, 163, 191, 0.12);
  --faq-pad: clamp(16px, 4vw, 32px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-faq .faq-hero {
  padding-block: clamp(18px, 3.5vw, 34px) clamp(8px, 2vw, 16px);
}

.page-faq .faq-hero-frame {
  position: relative;
  overflow: hidden;
  padding: clamp(18px, 4vw, 40px);
  border: 1px solid var(--faq-line);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(120% 120% at 6% -25%, rgba(69, 243, 228, 0.18), transparent 58%),
    radial-gradient(90% 110% at 102% -5%, rgba(155, 108, 255, 0.2), transparent 62%),
    linear-gradient(165deg, rgba(14, 23, 40, 0.94) 0%, rgba(6, 10, 18, 0.9) 100%);
  box-shadow: 0 30px 60px -44px rgba(0, 0, 0, 0.95);
}

.page-faq .faq-hero-frame::before {
  content: "";
  position: absolute;
  inset: 9px;
  border: 1px dashed rgba(69, 243, 228, 0.16);
  border-radius: calc(var(--radius-lg) - 6px);
  pointer-events: none;
}

.page-faq .faq-hero-frame::after {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--violet) 55%, var(--amber));
  opacity: 0.8;
}

.page-faq .faq-hero-frame > * {
  position: relative;
  z-index: 1;
}

.page-faq .crumb {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-faq .crumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .crumb a:hover,
.page-faq .crumb a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-faq .kicker {
  margin: 18px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-faq h1 {
  margin: 10px 0 0;
  font-size: clamp(34px, 9vw, 64px);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: 0.1em;
  color: var(--ice);
}

.page-faq h1::after {
  content: "";
  display: block;
  width: 56px;
  height: 3px;
  margin-top: 16px;
  background: linear-gradient(90deg, var(--cyan), var(--violet));
}

.page-faq .faq-lead {
  max-width: 62ch;
  margin: 18px 0 0;
  font-size: clamp(15px, 2.2vw, 18px);
  line-height: 1.8;
  color: var(--ice);
}

.page-faq .faq-lead--sub {
  margin-top: 10px;
  font-size: clamp(14px, 1.9vw, 16px);
  color: var(--mist);
}

.page-faq .faq-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-jump a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--faq-line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.03);
  color: var(--ice);
  font-size: 13px;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease), color 0.2s var(--ease);
}

.page-faq .faq-jump a::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-faq .faq-jump li:nth-child(2) a::before { background: var(--violet); }
.page-faq .faq-jump li:nth-child(3) a::before { background: var(--amber); }
.page-faq .faq-jump li:nth-child(4) a::before { background: var(--violet); }
.page-faq .faq-jump li:nth-child(5) a::before { background: var(--amber); }

.page-faq .faq-jump a:hover,
.page-faq .faq-jump a:focus-visible {
  border-color: var(--cyan);
  background: var(--glass);
  color: var(--cyan);
}

.page-faq .faq-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  background: var(--faq-line);
  border: 1px solid var(--faq-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-faq .faq-stats > li {
  padding: 14px 14px 16px;
  background: rgba(6, 10, 18, 0.72);
}

.page-faq .faq-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 4vw, 26px);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-faq .faq-stats > li:nth-child(2) .faq-stat-num { color: var(--violet); }
.page-faq .faq-stats > li:nth-child(3) .faq-stat-num { color: var(--amber); }

.page-faq .faq-stat-label {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-faq .faq-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  margin-top: clamp(24px, 4vw, 46px);
}

/* 分类索引 */
.page-faq .faq-rail-inner {
  padding: 16px;
  border: 1px solid var(--faq-line);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(14, 23, 40, 0.9), rgba(6, 10, 18, 0.66));
}

.page-faq .faq-rail-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.page-faq .faq-rail-nav {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: max-content;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
}

.page-faq .faq-rail-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 12px;
  border: 1px solid var(--faq-line-soft);
  border-bottom: 3px solid var(--rail-c, var(--cyan));
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  background: rgba(255, 255, 255, 0.025);
  color: var(--ice);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.page-faq .faq-rail-link--query { --rail-c: var(--cyan); }
.page-faq .faq-rail-link--switch { --rail-c: var(--violet); }
.page-faq .faq-rail-link--activity { --rail-c: var(--amber); }
.page-faq .faq-rail-link--contact { --rail-c: var(--ice); }
.page-faq .faq-rail-link--help { --rail-c: var(--alert); }

.page-faq .faq-rail-num {
  flex: none;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--rail-c, var(--cyan));
}

.page-faq .faq-rail-link:hover,
.page-faq .faq-rail-link:focus-visible {
  background: var(--glass);
  color: var(--cyan);
}

.page-faq .faq-rail-card {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px dashed var(--faq-line);
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}

.page-faq .faq-rail-card p {
  margin: 0;
}

.page-faq .faq-rail-card a {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 180, 84, 0.45);
}

.page-faq .faq-rail-card a:hover,
.page-faq .faq-rail-card a:focus-visible {
  color: var(--paper-hi);
  border-bottom-color: var(--paper-hi);
}

.page-faq .faq-rail-mono {
  margin-top: 8px;
  font-size: 12px;
  color: var(--cyan);
  word-break: break-all;
}

/* 分组 */
.page-faq .faq-group {
  scroll-margin-top: 28px;
  min-width: 0;
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(32px, 5vw, 56px);
}

.page-faq .faq-group--query { --acc: var(--cyan); }
.page-faq .faq-group--switch { --acc: var(--violet); }
.page-faq .faq-group--activity { --acc: var(--amber); }
.page-faq .faq-group--contact { --acc: var(--ice); }
.page-faq .faq-group--help { --acc: var(--ink-deep); }

.page-faq .faq-group-head {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--faq-line);
  margin-bottom: 18px;
}

.page-faq .faq-group-num {
  flex: none;
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: var(--acc, var(--cyan));
  color: var(--ink-void);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-faq .faq-group-head h2 {
  margin: 0;
  font-size: clamp(20px, 3.4vw, 28px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: 0.06em;
  color: var(--ice);
}

.page-faq .faq-group-head p {
  margin: 6px 0 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* 图片 */
.page-faq .faq-figure {
  margin: 0 0 18px;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: 0;
}

.page-faq .faq-figure--slim img {
  aspect-ratio: 2 / 1;
}

.page-faq .faq-figure figcaption {
  padding: 10px 14px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
  background: rgba(6, 10, 18, 0.72);
  border-top: 1px solid var(--faq-line);
}

/* 手风琴 */
.page-faq .faq-item {
  border: 1px solid var(--faq-line);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(14, 23, 40, 0.86), rgba(6, 10, 18, 0.7));
  overflow: hidden;
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-faq .faq-item + .faq-item {
  margin-top: 10px;
}

.page-faq .faq-item:hover {
  border-color: rgba(69, 243, 228, 0.38);
}

.page-faq .faq-item[open] {
  border-color: rgba(69, 243, 228, 0.42);
  box-shadow: inset 3px 0 0 var(--acc, var(--cyan));
}

.page-faq .faq-q {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 16px;
  list-style: none;
  cursor: pointer;
}

.page-faq .faq-q::-webkit-details-marker {
  display: none;
}

.page-faq .faq-q-idx {
  flex: none;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--acc, var(--cyan));
}

.page-faq .faq-q-text {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--ice);
  transition: color 0.2s var(--ease);
}

.page-faq .faq-q:hover .faq-q-text {
  color: var(--cyan);
}

.page-faq .faq-q-mark {
  position: relative;
  flex: none;
  width: 14px;
  height: 14px;
  margin-left: auto;
}

.page-faq .faq-q-mark::before,
.page-faq .faq-q-mark::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--acc, var(--cyan));
  transform: translateY(-50%);
  transition: transform 0.25s var(--ease), opacity 0.25s var(--ease);
}

.page-faq .faq-q-mark::after {
  transform: translateY(-50%) rotate(90deg);
}

.page-faq .faq-item[open] .faq-q-mark::after {
  transform: translateY(-50%) rotate(0deg);
  opacity: 0;
}

.page-faq .faq-a {
  padding: 0 16px 18px;
  border-top: 1px dashed var(--faq-line);
  margin-top: 2px;
  padding-top: 14px;
}

.page-faq .faq-a p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-faq .faq-a p + p,
.page-faq .faq-a p + .faq-steps,
.page-faq .faq-a .faq-steps + p,
.page-faq .faq-a p + .faq-tags,
.page-faq .faq-a .faq-tags + p,
.page-faq .faq-a p + .faq-kv {
  margin-top: 12px;
}

.page-faq .faq-a a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(69, 243, 228, 0.4);
}

.page-faq .faq-a a:hover,
.page-faq .faq-a a:focus-visible {
  color: var(--paper-hi);
  border-bottom-color: var(--paper-hi);
}

.page-faq .faq-note {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: var(--amber) !important;
}

/* 步骤 */
.page-faq .faq-steps {
  counter-reset: step;
  display: grid;
  gap: 8px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-steps li {
  position: relative;
  padding-left: 36px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ice);
}

.page-faq .faq-steps li::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  display: grid;
  place-items: center;
  min-width: 24px;
  height: 22px;
  border-radius: 6px;
  background: var(--acc, var(--cyan));
  color: var(--ink-void);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-faq .faq-group--contact .faq-steps li::before,
.page-faq .faq-group--switch .faq-steps li::before {
  color: var(--ink-void);
}

/* 标签 */
.page-faq .faq-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

/* 键值列表 */
.page-faq .faq-kv {
  display: grid;
  gap: 10px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-kv li {
  display: grid;
  gap: 3px;
  padding: 10px 12px;
  border: 1px solid var(--faq-line-soft);
  border-radius: var(--radius-sm);
  background: rgba(6, 10, 18, 0.55);
}

.page-faq .faq-kv span {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-faq .faq-kv b {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--ice);
  word-break: break-word;
}

.page-faq .faq-kv b.mono {
  color: var(--cyan);
  letter-spacing: 0.02em;
}

/* 帮助面板（暖纸层） */
.page-faq .faq-help {
  padding: clamp(20px, 4vw, 36px);
  border: 1px solid rgba(17, 24, 39, 0.12);
  border-radius: var(--radius-lg);
  background-color: var(--paper);
  background-image: radial-gradient(rgba(17, 24, 39, 0.05) 1px, transparent 1px);
  background-size: 4px 4px;
  color: var(--ink-deep);
  box-shadow: 0 26px 50px -40px rgba(0, 0, 0, 0.85);
}

.page-faq .faq-help .kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--ink-deep);
  opacity: 0.62;
}

.page-faq .faq-help h2 {
  margin: 10px 0 0;
  font-size: clamp(22px, 3.6vw, 32px);
  font-weight: 900;
  letter-spacing: 0.05em;
  line-height: 1.2;
  color: var(--ink-deep);
}

.page-faq .faq-help-lead {
  max-width: 60ch;
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(17, 24, 39, 0.78);
}

.page-faq .faq-help-kv {
  display: grid;
  gap: 10px;
  margin: 20px 0 0;
  padding: 0;
}

.page-faq .faq-help-kv-row {
  display: grid;
  gap: 3px;
  padding: 12px 14px;
  border-left: 3px solid var(--ink-deep);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--paper-hi);
}

.page-faq .faq-help-kv dt {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: rgba(17, 24, 39, 0.6);
}

.page-faq .faq-help-kv dd {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--ink-deep);
  word-break: break-word;
}

.page-faq .faq-help-kv dd.mono {
  letter-spacing: 0.02em;
}

.page-faq .faq-help-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 18px;
  margin-top: 22px;
}

.page-faq .faq-help-link {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ink-deep);
  text-decoration: none;
  border-bottom: 1px solid rgba(17, 24, 39, 0.35);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .faq-help-link:hover,
.page-faq .faq-help-link:focus-visible {
  border-bottom-color: var(--ink-deep);
  color: #000;
}

/* 焦点环 */
.page-faq a:focus-visible,
.page-faq summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-faq .faq-help a:focus-visible {
  outline-color: var(--ink-deep);
}

/* 桌面 */
@media (min-width: 720px) {
  .page-faq .faq-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .faq-kv li {
    grid-template-columns: 88px minmax(0, 1fr);
    align-items: baseline;
    gap: 12px;
  }

  .page-faq .faq-help-kv {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-shell {
    grid-template-columns: 248px minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-rail-inner {
    position: sticky;
    top: 20px;
    padding: 18px;
  }

  .page-faq .faq-rail-nav {
    grid-auto-flow: row;
    grid-auto-columns: auto;
    grid-template-columns: minmax(0, 1fr);
    overflow: visible;
    padding-bottom: 0;
    gap: 6px;
  }

  .page-faq .faq-rail-link {
    border: 0;
    border-left: 3px solid var(--rail-c, var(--cyan));
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    white-space: normal;
    transition: background 0.2s var(--ease), color 0.2s var(--ease), transform 0.2s var(--ease);
  }

  .page-faq .faq-rail-link:hover,
  .page-faq .faq-rail-link:focus-visible {
    transform: translateX(3px);
  }

  .page-faq .faq-q {
    padding: 17px 20px;
  }

  .page-faq .faq-a {
    padding: 16px 20px 20px;
  }

  .page-faq .faq-q-text {
    font-size: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}