.page-faq {
  --faq-rail-w: 220px;
  --faq-gap: clamp(28px, 5vw, 64px);
  --faq-soft-line: var(--line);
  display: block;
  background: var(--ink-0);
  color: var(--text);
  padding-bottom: clamp(40px, 7vw, 88px);
}

/* ---------- 首屏框景 ---------- */
.page-faq .faq-hero {
  padding: clamp(20px, 5vw, 64px) var(--gutter) 0;
}

.page-faq .faq-frame {
  position: relative;
  max-width: var(--page-max);
  margin: 0 auto;
  padding: clamp(20px, 4vw, 48px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(120% 100% at 8% 0%, var(--glow-1), transparent 58%),
    radial-gradient(90% 90% at 96% 6%, var(--glow-2), transparent 55%),
    var(--card-bg);
  box-shadow: var(--shadow-panel);
  overflow: hidden;
}

.page-faq .faq-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px),
    linear-gradient(0deg, var(--grid-line) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: .55;
  -webkit-mask-image: radial-gradient(85% 80% at 40% 0%, #000 0%, transparent 78%);
  mask-image: radial-gradient(85% 80% at 40% 0%, #000 0%, transparent 78%);
  pointer-events: none;
}

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

.page-faq .faq-crumbs {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--dim);
}

.page-faq .faq-crumb-sep {
  margin: 0 6px;
  color: var(--line);
}

.page-faq .faq-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 44px);
  padding-top: clamp(16px, 3vw, 28px);
}

.page-faq .faq-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(32px, 6.4vw, 58px);
  line-height: 1.06;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--text);
  max-width: 20ch;
}

.page-faq .faq-hero .lede {
  margin: 18px 0 0;
  max-width: 46ch;
  color: var(--dim);
  font-size: 16px;
  line-height: 1.78;
}

.page-faq .faq-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

/* 速查目录 */
.page-faq .faq-quick {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--card-bg);
  padding: 8px;
  box-shadow: var(--shadow-panel);
}

.page-faq .faq-quick-cap {
  margin: 10px 12px 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--dim);
}

.page-faq .faq-quick-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 12px;
  text-decoration: none;
  color: var(--text);
  transition: background .2s var(--ease), box-shadow .2s var(--ease);
}

.page-faq .faq-quick-item:hover {
  background: var(--ink-1);
  box-shadow: inset 0 0 0 1px var(--line);
}

.page-faq .faq-quick-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--cyan);
}

.page-faq .faq-quick-label {
  font-size: 14px;
  line-height: 1.4;
}

.page-faq .faq-quick-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--dim);
  letter-spacing: .06em;
}

/* 刻度带 */
.page-faq .faq-ticker {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  margin-top: clamp(20px, 3vw, 36px);
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--dim);
}

.page-faq .faq-ticker span::before {
  content: "·";
  margin-right: 8px;
  color: var(--cyan);
}

/* ---------- 主体布局 ---------- */
.page-faq .faq-layout {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: var(--faq-gap) var(--gutter) 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 56px);
}

/* 左侧索引 */
.page-faq .faq-rail {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.page-faq .faq-rail-cap {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--dim);
}

.page-faq .faq-rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: row;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}

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

.page-faq .faq-rail-list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  color: var(--dim);
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}

.page-faq .faq-rail-list a span {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .08em;
  color: var(--cyan);
}

.page-faq .faq-rail-list a:hover {
  color: var(--text);
  border-color: var(--cyan);
  background: var(--ink-1);
}

.page-faq .faq-rail-note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--dim);
}

.page-faq .faq-rail-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-faq .faq-rail-note a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  padding-block: clamp(24px, 4vw, 44px);
  border-top: 1px solid var(--line);
}

.page-faq .faq-group:first-child {
  border-top: none;
  padding-top: 0;
}

.page-faq .faq-group-head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: clamp(16px, 2.6vw, 26px);
}

.page-faq .faq-group-num {
  flex: none;
  padding-top: 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-faq .faq-group-title {
  margin: 0;
  font-size: clamp(22px, 3.2vw, 30px);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-faq .faq-group-note {
  margin: 8px 0 0;
  max-width: 48ch;
  font-size: 15px;
  line-height: 1.72;
  color: var(--dim);
}

/* ---------- 三步路径 SVG ---------- */
.page-faq .faq-path {
  display: block;
  width: 100%;
  height: auto;
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--card-bg);
}

.page-faq .faq-grad-a {
  stop-color: var(--violet);
}

.page-faq .faq-grad-b {
  stop-color: var(--cyan);
}

.page-faq .faq-path-axis {
  stroke: var(--line);
  stroke-width: 1;
  stroke-dasharray: 2 8;
}

.page-faq .faq-path-line {
  fill: none;
  stroke: url(#faqPathGrad);
  stroke-width: 2;
  stroke-dasharray: 6 8;
  stroke-linecap: round;
}

.page-faq .faq-path-node {
  fill: var(--ink-1);
  stroke: var(--cyan);
  stroke-width: 1.5;
}

.page-faq .faq-path-num {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  fill: var(--text);
}

.page-faq .faq-path-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  fill: var(--dim);
}

/* ---------- 三步卡片 ---------- */
.page-faq .faq-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-faq .faq-step {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--card-bg);
  transition: border-color .22s var(--ease), transform .22s var(--ease);
}

.page-faq .faq-step:hover {
  border-color: var(--cyan);
  transform: translateY(-3px);
}

.page-faq .faq-step-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-step h3 {
  margin: 0;
  font-size: 18px;
  line-height: 1.35;
  color: var(--text);
}

.page-faq .faq-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--dim);
}

.page-faq .faq-step .faq-step-result {
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  color: var(--text);
  font-size: 14px;
}

.page-faq .faq-step-link {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .2s var(--ease);
}

.page-faq .faq-step-link:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 面板分栏 ---------- */
.page-faq .faq-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 18px;
}

.page-faq .faq-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--card-bg);
  overflow: hidden;
}

.page-faq .faq-figure--wide {
  margin-bottom: 18px;
}

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

.page-faq .faq-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--dim);
}

.page-faq .faq-terms {
  margin: 0;
  display: grid;
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--line);
  overflow: hidden;
}

.page-faq .faq-term {
  padding: 12px 16px;
  background: var(--card-bg);
}

.page-faq .faq-term dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-faq .faq-term dd {
  margin: 5px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--dim);
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-stack {
  display: grid;
  gap: 10px;
}

.page-faq .faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--panel);
  transition: border-color .2s var(--ease);
}

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

.page-faq .faq-q {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  font-size: 16px;
  font-weight: 500;
  line-height: 1.5;
  color: var(--text);
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-q-num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--dim);
}

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

.page-faq .faq-q-text {
  flex: 1 1 auto;
}

.page-faq .faq-q-icon {
  position: relative;
  flex: none;
  width: 14px;
  height: 14px;
}

.page-faq .faq-q-icon::before,
.page-faq .faq-q-icon::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  border-radius: 2px;
  transition: transform .2s var(--ease), opacity .2s var(--ease);
}

.page-faq .faq-q-icon::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.page-faq .faq-q-icon::after {
  left: 6px;
  top: 0;
  width: 2px;
  height: 14px;
}

.page-faq .faq-item[open] .faq-q-icon::after {
  transform: rotate(90deg);
  opacity: 0;
}

.page-faq .faq-a {
  margin: 0 16px 16px;
  padding: 4px 0 4px 14px;
  border-left: 2px solid var(--cyan);
  font-size: 15px;
  line-height: 1.8;
  color: var(--dim);
  animation: faq-reveal 220ms var(--ease) both;
}

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

.page-faq .faq-a p + p {
  margin-top: 8px;
}

@keyframes faq-reveal {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* 紧凑组 */
.page-faq .faq-group--tight .faq-stack {
  gap: 6px;
}

.page-faq .faq-group--tight .faq-q {
  padding: 11px 14px;
  font-size: 15px;
}

.page-faq .faq-group--tight .faq-a {
  margin: 0 14px 12px;
  padding: 2px 0 2px 12px;
  font-size: 14px;
  line-height: 1.74;
}

/* ---------- 联系区 ---------- */
.page-faq .faq-support {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-faq .faq-support-card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--card-bg);
}

.page-faq .faq-support-card:first-child {
  background:
    radial-gradient(120% 120% at 0% 0%, var(--glow-2), transparent 62%),
    var(--card-bg);
}

.page-faq .faq-support-label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--dim);
}

.page-faq .faq-support-value {
  margin: 0;
  font-size: 16px;
  line-height: 1.5;
  color: var(--text);
  word-break: break-word;
}

.page-faq .faq-support-value--mono {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: -.01em;
}

.page-faq .faq-support-note {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--dim);
}

.page-faq .faq-support-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

/* ---------- 焦点 ---------- */
.page-faq a:focus-visible,
.page-faq summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 8px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-faq .faq-support {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero-grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, .82fr);
    align-items: start;
  }
  .page-faq .faq-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-faq .faq-split {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
    align-items: start;
    gap: 20px;
  }
  .page-faq .faq-support {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    align-items: start;
  }
  .page-faq .faq-rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }
  .page-faq .faq-rail-list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--line);
  }
  .page-faq .faq-rail-list a {
    border: none;
    border-left: 2px solid transparent;
    border-radius: 0;
    padding: 8px 10px 8px 12px;
    margin-left: -1px;
    white-space: normal;
    font-size: 14px;
  }
  .page-faq .faq-rail-list a:hover {
    background: transparent;
    border-left-color: var(--cyan);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-a {
    animation: none;
  }
  .page-faq .faq-step,
  .page-faq .faq-step:hover {
    transform: none;
  }
  .page-faq .faq-quick-item,
  .page-faq .faq-rail-list a,
  .page-faq .faq-item,
  .page-faq .faq-q-icon::before,
  .page-faq .faq-q-icon::after {
    transition-duration: .01ms;
  }
}