.page-faq {
  --faq-measure: 38em;
  --faq-sticky-top: calc(var(--header-h-compact) + 28px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(36px, 8vw, 96px) clamp(32px, 5vw, 64px);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -22%;
  right: -14%;
  width: min(720px, 92vw);
  height: min(720px, 92vw);
  background:
    radial-gradient(circle at 32% 30%, rgba(122, 92, 255, 0.28), transparent 62%),
    radial-gradient(circle at 68% 64%, rgba(77, 240, 224, 0.16), transparent 60%);
  filter: blur(12px);
  pointer-events: none;
  z-index: 0;
}

.page-faq .faq-hero .shell {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero__title {
  margin: 18px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.6rem, 8vw, 5.4rem);
  line-height: 1.02;
  letter-spacing: -0.01em;
  color: var(--pure-white);
}

.page-faq .faq-hero__lead {
  margin: 24px 0 0;
  max-width: 40em;
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-hero__meta-item {
  display: inline-flex;
  align-items: center;
  padding: 7px 15px;
  border: 1px solid var(--structure);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--index-blue);
}

.page-faq .faq-hero__meta-item:first-child {
  border-color: rgba(77, 240, 224, 0.4);
  background: rgba(77, 240, 224, 0.08);
  color: var(--signal-cyan);
}

/* ---------- 布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 48px);
  align-items: start;
  padding-block: clamp(8px, 2vw, 20px) clamp(64px, 9vw, 120px);
}

/* ---------- 左栏主题索引 ---------- */
.page-faq .faq-index {
  min-width: 0;
}

.page-faq .faq-index__label {
  display: none;
}

.page-faq .faq-tabs {
  display: flex;
  gap: 6px;
  padding: 6px;
  border: 1px solid var(--structure);
  border-radius: var(--radius-pill);
  background: rgba(17, 28, 56, 0.55);
  overflow-x: auto;
  scrollbar-width: none;
}

.page-faq .faq-tabs::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-tab {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0;
  padding: 9px 16px;
  border: 0;
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.4;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color 120ms var(--ease-out), color 120ms var(--ease-out);
}

.page-faq .faq-tab:hover {
  color: var(--text-primary);
  background: rgba(242, 245, 255, 0.05);
}

.page-faq .faq-tab[aria-selected="true"] {
  background: rgba(77, 240, 224, 0.13);
  color: var(--signal-cyan);
}

.page-faq .faq-tab:focus-visible {
  outline: 2px solid var(--signal-cyan);
  outline-offset: 2px;
}

.page-faq .faq-tab__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--index-blue);
}

.page-faq .faq-tab[aria-selected="true"] .faq-tab__num {
  color: var(--signal-cyan);
}

/* ---------- 右栏手册主体 ---------- */
.page-faq .faq-body {
  min-width: 0;
  display: grid;
  gap: clamp(40px, 5vw, 68px);
}

.page-faq .faq-panel {
  min-width: 0;
  padding-top: clamp(22px, 3vw, 36px);
  border-top: 1px solid var(--structure);
}

.page-faq .faq-panel:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-faq .faq-panel:focus-visible {
  outline: 2px solid var(--signal-cyan);
  outline-offset: 10px;
  border-radius: var(--radius-md);
}

.page-faq .faq-chapter__head {
  margin-bottom: 20px;
}

.page-faq .faq-chapter__title {
  margin: 10px 0 0;
  font-family: var(--font-emphasis);
  font-weight: 900;
  font-size: clamp(1.5rem, 2.6vw, 2.05rem);
  line-height: 1.22;
  letter-spacing: -0.005em;
  color: var(--pure-white);
}

.page-faq .faq-subtitle {
  margin: 30px 0 12px;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.5;
  color: var(--text-primary);
}

/* ---------- 正文与链接 ---------- */
.page-faq .faq-text {
  margin: 0 0 18px;
  max-width: var(--faq-measure);
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-secondary);
}

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

.page-faq .faq-text a {
  color: var(--signal-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(77, 240, 224, 0.45);
}

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

/* ---------- 图文并排（快速开始） ---------- */
.page-faq .faq-feature {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-faq .faq-feature__main {
  min-width: 0;
}

/* ---------- 编号步骤 ---------- */
.page-faq .faq-steps {
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 20px;
}

.page-faq .faq-step {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
}

.page-faq .faq-step__num {
  position: relative;
  padding-left: 15px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--signal-cyan);
  line-height: 1.85;
}

.page-faq .faq-step__num::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--signal-cyan);
  box-shadow: 0 0 12px rgba(77, 240, 224, 0.7);
}

.page-faq .faq-step__body {
  min-width: 0;
}

.page-faq .faq-step__body > *:last-child {
  margin-bottom: 0;
}

.page-faq .faq-step__title {
  margin: 0 0 6px;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
}

/* ---------- 方法条目 ---------- */
.page-faq .faq-methods {
  display: grid;
  gap: 1px;
  margin: 0 0 24px;
  background: var(--structure);
  border-top: 1px solid var(--structure);
  border-bottom: 1px solid var(--structure);
}

.page-faq .faq-method {
  padding: 22px 0;
  background: var(--void);
}

.page-faq .faq-method__name {
  margin: 0 0 8px;
  font-family: var(--font-emphasis);
  font-weight: 900;
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--signal-cyan);
}

.page-faq .faq-method .faq-text {
  margin-bottom: 0;
}

/* ---------- 字段说明列表 ---------- */
.page-faq .faq-fields {
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-faq .faq-field {
  padding: 16px 0;
  border-top: 1px solid var(--structure);
}

.page-faq .faq-field:first-of-type {
  border-top: 1px solid var(--structure);
}

.page-faq .faq-field dt {
  margin: 0 0 6px;
  font-family: var(--font-emphasis);
  font-weight: 900;
  font-size: 15px;
  letter-spacing: 0.03em;
  color: var(--text-primary);
}

.page-faq .faq-field dd {
  margin: 0;
  max-width: var(--faq-measure);
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-secondary);
}

.page-faq .faq-field dd a {
  color: var(--signal-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(77, 240, 224, 0.45);
}

/* ---------- 口径提示 ---------- */
.page-faq .faq-note {
  margin: 26px 0 0;
  padding: 18px 20px;
  max-width: 42em;
  border: 1px dashed var(--structure);
  border-radius: var(--radius-md);
  background: rgba(10, 18, 38, 0.55);
}

.page-faq .faq-note__label {
  display: block;
  margin-bottom: 8px;
}

.page-faq .faq-note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-secondary);
}

/* ---------- 版本号 ---------- */
.page-faq .faq-version {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  margin: 26px 0 8px;
  padding: 12px 22px;
  border: 1px solid rgba(77, 240, 224, 0.38);
  border-radius: var(--radius-pill);
  background: linear-gradient(120deg, rgba(77, 240, 224, 0.14), rgba(122, 92, 255, 0.16));
}

.page-faq .faq-version__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--pure-white);
  line-height: 1;
}

/* ---------- 时间窗 ---------- */
.page-faq .faq-timeline {
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
}

.page-faq .faq-timeline__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 0;
  border-top: 1px solid var(--structure);
}

.page-faq .faq-timeline__key {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--signal-cyan);
}

.page-faq .faq-timeline__desc {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-secondary);
}

/* ---------- 折叠条目 ---------- */
.page-faq .faq-item {
  margin-top: 18px;
  padding: 16px 0 0;
  border-top: 1px solid var(--structure);
}

.page-faq .faq-item__q {
  position: relative;
  padding-right: 30px;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-emphasis);
  font-weight: 900;
  font-size: 15px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--text-primary);
}

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

.page-faq .faq-item__q::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 0;
  font-family: var(--font-mono);
  font-weight: 400;
  color: var(--signal-cyan);
}

.page-faq .faq-item[open] .faq-item__q::after {
  content: "−";
}

.page-faq .faq-item__q:focus-visible {
  outline: 2px solid var(--signal-cyan);
  outline-offset: 4px;
  border-radius: var(--radius-md);
}

.page-faq .faq-item__a {
  margin-top: 10px;
  max-width: var(--faq-measure);
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-secondary);
}

/* ---------- 图片 ---------- */
.page-faq .faq-figure {
  margin: 28px 0 0;
  aspect-ratio: 3 / 2;
  overflow: hidden;
}

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

.page-faq .faq-figure--aside {
  margin-top: 0;
  aspect-ratio: 3 / 2;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-layout {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    gap: clamp(36px, 4vw, 72px);
  }

  .page-faq .faq-index {
    position: sticky;
    top: var(--faq-sticky-top);
    align-self: start;
  }

  .page-faq .faq-index__label {
    display: block;
    margin: 0 0 14px;
  }

  .page-faq .faq-tabs {
    flex-direction: column;
    gap: 2px;
    padding: 10px;
    border-radius: var(--radius-lg);
    overflow: visible;
  }

  .page-faq .faq-tab {
    justify-content: flex-start;
    width: 100%;
    padding: 11px 14px;
    border-radius: var(--radius-md);
    text-align: left;
    white-space: normal;
  }

  .page-faq .faq-feature {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: clamp(28px, 3.5vw, 48px);
    align-items: start;
  }

  .page-faq .faq-figure--aside {
    margin-top: 6px;
  }

  .page-faq .faq-timeline__row {
    grid-template-columns: 170px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-field {
    display: grid;
    grid-template-columns: minmax(0, 168px) minmax(0, 1fr);
    gap: 0 28px;
    align-items: start;
    padding: 18px 0;
  }

  .page-faq .faq-field dt {
    margin-bottom: 0;
    padding-top: 2px;
  }
}

/* ---------- 打印 ---------- */
@media print {
  .page-faq .faq-index,
  .page-faq .faq-hero::before {
    display: none !important;
  }

  .page-faq .faq-item > *:not(summary) {
    display: block !important;
  }

  .page-faq .faq-panel {
    break-inside: avoid;
    page-break-inside: avoid;
  }
}