.page-faq {
  --faq-hair: 1px solid var(--line);
  --faq-pad-x: 18px;
  --faq-shell-gap: 26px;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  padding: 26px 0 76px;
  overflow-x: clip;
}

.page-faq a {
  color: inherit;
  text-decoration: none;
}

.page-faq .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-2);
  margin-bottom: 16px;
}

.page-faq .breadcrumb a {
  color: var(--ink-2);
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast);
}

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

.page-faq .breadcrumb__sep {
  color: var(--line);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-intro {
  position: relative;
  border: var(--faq-hair);
  background: linear-gradient(118deg, var(--panel-2) 0%, var(--panel) 44%, var(--panel) 100%);
  padding: 26px var(--faq-pad-x) 24px;
  overflow: hidden;
}

.page-faq .faq-intro::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(
    90deg,
    var(--cyan) 0%,
    var(--cyan) 32%,
    var(--orange) 32%,
    var(--orange) 50%,
    var(--line) 50%,
    var(--line) 100%
  );
}

.page-faq .faq-intro__eyebrow {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 8px 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-2);
}

.page-faq .faq-intro__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px var(--cyan-a16);
  animation: faq-pulse 2.4s ease-in-out infinite;
}

@keyframes faq-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.page-faq .faq-intro__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(27px, 6.4vw, 46px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-faq .faq-intro__lead {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-2);
}

.page-faq .faq-ticks {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 3px;
  margin-top: 22px;
}

.page-faq .faq-ticks__seg {
  height: 3px;
  background: var(--line);
}

.page-faq .faq-ticks__seg:first-child {
  background: var(--cyan);
}

.page-faq .faq-ticks__seg:nth-child(4) {
  background: var(--orange);
}

/* ---------- 左右分栏 ---------- */

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-shell-gap);
  margin-top: var(--faq-shell-gap);
}

.page-faq .faq-rail {
  border: var(--faq-hair);
  background: var(--panel);
  padding: 12px;
}

.page-faq .faq-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-2);
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-faq .faq-rail__link {
  display: grid;
  grid-template-columns: auto auto auto;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 9px 11px;
  border: var(--faq-hair);
  background: var(--bg);
  color: var(--ink-2);
  font-size: 13px;
  transition: color var(--t-fast), border-color var(--t-fast), background var(--t-fast);
}

.page-faq .faq-rail__link:hover {
  color: var(--ink);
  border-color: var(--cyan);
  background: var(--panel-2);
}

.page-faq .faq-rail__link.is-active,
.page-faq .faq-rail__link[aria-current="true"] {
  color: var(--ink);
  border-color: var(--cyan);
  background: var(--cyan-a08);
  box-shadow: inset 2px 0 0 var(--cyan);
}

.page-faq .faq-rail__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-faq .faq-rail__n {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-2);
  padding-left: 6px;
  border-left: 1px solid var(--line);
}

.page-faq .faq-stream {
  display: grid;
  gap: 18px;
  min-width: 0;
}

.page-faq .faq-stream__list {
  display: grid;
  gap: 18px;
  min-width: 0;
}

/* ---------- 筛选条 ---------- */

.page-faq .tag-filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px;
  padding: 11px 12px;
  border: var(--faq-hair);
  background: var(--panel-2);
}

.page-faq .tag-filter__btn {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-2);
  background: transparent;
  border: var(--faq-hair);
  padding: 6px 11px;
  cursor: pointer;
  transition: color var(--t-fast), border-color var(--t-fast), background var(--t-fast);
}

.page-faq .tag-filter__btn:hover {
  color: var(--ink);
  border-color: var(--cyan);
}

.page-faq .tag-filter__btn.is-active,
.page-faq .tag-filter__btn[aria-pressed="true"] {
  color: var(--bg);
  background: var(--cyan);
  border-color: var(--cyan);
  font-weight: 700;
}

.page-faq .tag-filter__count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-2);
  letter-spacing: 0.04em;
}

/* ---------- 分组 ---------- */

.page-faq .faq-group {
  border: var(--faq-hair);
  background: var(--panel);
  min-width: 0;
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px var(--faq-pad-x);
  background: var(--panel-2);
  border-bottom: var(--faq-hair);
}

.page-faq .faq-group__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-faq .faq-group__n {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-2);
}

/* ---------- 配图 ---------- */

.page-faq .faq-figure {
  margin: 0;
  padding: 16px var(--faq-pad-x) 4px;
  border-bottom: var(--faq-hair);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--panel-2);
}

.page-faq .faq-figure .media-frame {
  border: var(--faq-hair);
  overflow: hidden;
}

.page-faq .faq-figure .media-frame__cap {
  display: block;
  margin-top: 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--ink-2);
}

/* ---------- 问答条目 ---------- */

.page-faq .index-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq .index-row {
  border-bottom: var(--faq-hair);
}

.page-faq .index-row:last-child {
  border-bottom: 0;
}

.page-faq .index-row__head {
  width: 100%;
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) 22px;
  align-items: center;
  gap: 10px;
  padding: 13px var(--faq-pad-x);
  background: transparent;
  border: 0;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: background var(--t-fast);
}

.page-faq .index-row__head:hover {
  background: var(--cyan-a08);
}

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

.page-faq .index-row__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-faq .index-row__q {
  font-size: 15px;
  font-weight: 500;
  line-height: 1.6;
  color: var(--ink);
}

.page-faq .index-row__toggle {
  justify-self: end;
  position: relative;
  width: 14px;
  height: 14px;
}

.page-faq .index-row__toggle::before,
.page-faq .index-row__toggle::after {
  content: "";
  position: absolute;
  background: var(--ink-2);
  transition: transform var(--t-mid), background var(--t-fast);
}

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

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

.page-faq .index-row.is-open .index-row__toggle::after {
  transform: scaleY(0);
}

.page-faq .index-row.is-open .index-row__toggle::before {
  background: var(--cyan);
}

.page-faq .index-row.is-open .index-row__key {
  color: var(--orange);
}

.page-faq .index-row__body {
  position: relative;
  padding: 2px var(--faq-pad-x) 18px 52px;
}

.page-faq .index-row__body::before {
  content: "";
  position: absolute;
  left: var(--faq-pad-x);
  top: 4px;
  bottom: 22px;
  width: 2px;
  background: var(--cyan);
}

.page-faq .index-row__body p {
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-2);
  max-width: 62ch;
}

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

/* ---------- 步骤序号 ---------- */

.page-faq .faq-steps {
  list-style: none;
  margin: 0 0 10px;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-faq .faq-steps li {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 10px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ink-2);
}

.page-faq .faq-steps__n {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--orange);
  padding-top: 3px;
}

/* ---------- 术语提示 ---------- */

.page-faq .faq-term {
  position: relative;
  border-bottom: 1px dashed var(--cyan);
  color: var(--ink);
  cursor: help;
}

.page-faq .faq-term::after {
  content: attr(data-hint);
  position: absolute;
  left: 0;
  bottom: calc(100% + 10px);
  width: max-content;
  max-width: 240px;
  padding: 8px 10px;
  border: var(--faq-hair);
  background: var(--panel-2);
  color: var(--ink);
  font-size: 12px;
  line-height: 1.6;
  white-space: normal;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--t-fast);
  z-index: 6;
}

.page-faq .faq-term:hover::after,
.page-faq .faq-term:focus-visible::after {
  opacity: 1;
}

/* ---------- 条目内 CTA ---------- */

.page-faq .faq-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px !important;
}

/* ---------- 平板与桌面 ---------- */

@media (min-width: 700px) {
  .page-faq {
    --faq-pad-x: 24px;
    padding: 34px 0 92px;
  }

  .page-faq .faq-intro {
    padding: 32px 30px 28px;
  }

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

  .page-faq .index-row__head {
    grid-template-columns: 52px minmax(0, 1fr) 24px;
    padding: 15px var(--faq-pad-x);
  }

  .page-faq .index-row__q {
    font-size: 16px;
  }

  .page-faq .index-row__body {
    padding-left: 66px;
  }

  .page-faq .index-row__body::before {
    left: var(--faq-pad-x);
  }
}

@media (min-width: 1000px) {
  .page-faq {
    --faq-shell-gap: 32px;
  }

  .page-faq .faq-layout {
    grid-template-columns: 236px minmax(0, 1fr);
    gap: 32px;
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 104px;
    padding: 16px 12px;
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
  }

  .page-faq .faq-rail__link {
    grid-template-columns: 28px minmax(0, 1fr) auto;
    white-space: normal;
    padding: 10px 10px;
    border-color: transparent;
    background: transparent;
    font-size: 13px;
  }

  .page-faq .faq-rail__link:hover {
    border-color: var(--line);
    background: var(--panel-2);
  }

  .page-faq .faq-rail__link.is-active,
  .page-faq .faq-rail__link[aria-current="true"] {
    border-color: transparent;
    background: var(--cyan-a08);
  }

  .page-faq .faq-figure {
    padding: 20px var(--faq-pad-x) 6px;
  }
}

@media (min-width: 1280px) {
  .page-faq .faq-intro {
    padding: 38px 44px 32px;
  }

  .page-faq .faq-stream {
    gap: 22px;
  }

  .page-faq .faq-stream__list {
    gap: 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-intro__dot {
    animation: none;
  }

  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    transition-duration: 0.01ms !important;
  }
}