.page-faq {
  --faq-card-bg: linear-gradient(180deg, rgba(22, 36, 31, .92), rgba(12, 22, 19, .88));
  --faq-card-bg-soft: rgba(12, 22, 19, .55);
  display: block;
  position: relative;
}

/* ===== 首屏 ===== */
.page-faq .faq-hero {
  position: relative;
  padding: calc(var(--topbar-h) + 40px) 0 48px;
  overflow: hidden;
  background:
    radial-gradient(130% 80% at 92% 0%, rgba(46, 125, 79, .38), rgba(12, 22, 19, 0) 62%),
    linear-gradient(160deg, var(--bg-deep) 0%, var(--bg-stand) 100%);
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 2;
  max-width: 780px;
}

.page-faq .faq-hero h1 {
  max-width: 17em;
  margin: 10px 0 18px;
}

.page-faq .faq-hero .lede {
  max-width: 34em;
}

.page-faq .faq-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-jump a {
  text-decoration: none;
  transition: transform var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}

.page-faq .faq-jump a:hover,
.page-faq .faq-jump a:focus-visible {
  transform: translateY(-2px);
  border-color: var(--pitch-bright);
}

.page-faq .faq-hero__art {
  position: absolute;
  right: -110px;
  bottom: -130px;
  width: 300px;
  height: 300px;
  opacity: .3;
  pointer-events: none;
  z-index: 1;
}

.page-faq .faq-arc {
  width: 100%;
  height: 100%;
  overflow: visible;
}

.page-faq .arc-line {
  fill: none;
  stroke: var(--line);
  stroke-width: 1.4;
}

.page-faq .arc-cyan {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 1;
  opacity: .5;
  stroke-dasharray: 3 9;
}

.page-faq .arc-pitch {
  fill: none;
  stroke: var(--pitch);
  stroke-width: 2.6;
  stroke-dasharray: 12 14;
}

.page-faq .arc-orange {
  fill: var(--orange);
}

/* ===== 工具条 ===== */
.page-faq .faq-panel {
  padding-top: 44px;
}

.page-faq .faq-tools {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 34px;
}

.page-faq .faq-tools__head {
  max-width: 62ch;
}

.page-faq .faq-tools__head .sec-title {
  margin-bottom: 8px;
}

.page-faq .faq-tools .filter-bar {
  display: flex;
  flex-wrap: nowrap;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: thin;
}

.page-faq .faq-tools .filter-btn {
  flex: none;
}

.page-faq .faq-count-line {
  margin: 0;
  font-size: 15px;
  color: var(--muted);
}

.page-faq .faq-count-line .filter-count {
  font-family: var(--font-mono);
  color: var(--orange);
  font-weight: 700;
}

/* ===== 主体分栏 ===== */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  align-items: start;
  padding-bottom: 56px;
}

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

/* ===== 分组卡片 ===== */
.page-faq .faq-group {
  position: relative;
  padding: 24px 20px 20px;
  margin-bottom: 22px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  background: var(--faq-card-bg);
  overflow: hidden;
}

.page-faq .faq-group::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--pitch), rgba(46, 125, 79, 0));
  opacity: .85;
  transition: width var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .faq-group:has(details[open])::before {
  width: 5px;
  background: linear-gradient(180deg, var(--pitch-bright), var(--pitch));
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 14px;
  align-items: baseline;
  margin-bottom: 14px;
}

.page-faq .faq-group__head h3 {
  margin: 0;
}

.page-faq .faq-group__desc {
  grid-column: 1 / -1;
  margin: 0;
  max-width: 46em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--muted);
}

/* ===== 折叠问答 ===== */
.page-faq .faq-item {
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-item:first-of-type {
  border-top: 0;
}

.page-faq .faq-item > summary {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 4px;
  cursor: pointer;
  list-style: none;
  color: var(--warm);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.55;
  transition: color var(--dur-fast) var(--ease), background-color var(--dur-fast) var(--ease);
}

.page-faq .faq-item > summary::-webkit-details-marker {
  display: none;
}

.page-faq .faq-item > summary::after {
  content: "+";
  margin-left: auto;
  flex: none;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1.1;
  color: var(--cyan);
}

.page-faq .faq-item[open] > summary {
  color: var(--pitch-bright);
}

.page-faq .faq-item[open] > summary::after {
  content: "–";
  color: var(--orange);
}

.page-faq .faq-item > summary:hover {
  color: var(--pitch-bright);
}

.page-faq .faq-q {
  flex: none;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  font-weight: 400;
  color: var(--pitch-bright);
}

.page-faq .faq-answer {
  padding: 0 4px 18px;
}

.page-faq .faq-answer p {
  margin: 0;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--muted);
}

/* ===== 步骤 ===== */
.page-faq .steps {
  counter-reset: step;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-faq .steps li {
  counter-increment: step;
  position: relative;
  padding-left: 46px;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--warm);
}

.page-faq .steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  width: 32px;
  height: 27px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-sm);
  background: rgba(46, 125, 79, .22);
  border: 1px solid rgba(92, 201, 138, .35);
  font-family: var(--font-mono);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--pitch-bright);
}

.page-faq .faq-item[open] .steps li {
  animation: faq-step-in var(--dur) var(--ease) both;
}

.page-faq .faq-item[open] .steps li:nth-child(2) { animation-delay: 80ms; }
.page-faq .faq-item[open] .steps li:nth-child(3) { animation-delay: 160ms; }
.page-faq .faq-item[open] .steps li:nth-child(4) { animation-delay: 240ms; }

@keyframes faq-step-in {
  from { opacity: 0; transform: translateX(-10px); }
  to { opacity: 1; transform: none; }
}

/* ===== 图片 ===== */
.page-faq .faq-media {
  margin: 18px 0 4px;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-faq .faq-group--split .faq-media {
  max-width: 280px;
  margin: 0;
}

.page-faq .faq-group--wide .faq-media {
  max-width: 100%;
}

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

/* ===== 联系分组 ===== */
.page-faq .help-grid {
  display: grid;
  gap: 12px;
  margin: 4px 0 16px;
}

.page-faq .help-card {
  padding: 16px 18px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background: var(--faq-card-bg-soft);
}

.page-faq .help-card__key {
  margin: 0 0 6px;
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--muted);
}

.page-faq .help-card__val {
  margin: 0;
  font-size: 17px;
  line-height: 1.6;
  color: var(--warm);
  word-break: break-word;
}

.page-faq .help-card__val.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--orange);
}

.page-faq .help-card__row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 12px;
}

.page-faq .copy-status {
  font-size: 14px;
  color: var(--cyan);
}

.page-faq .faq-note {
  max-width: 46em;
  margin: 0 0 20px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--muted);
}

.page-faq .faq-cta {
  margin: 0;
}

/* ===== 右侧刻度 ===== */
.page-faq .faq-rail {
  display: none;
}

.page-faq .faq-rail__label {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--muted);
}

.page-faq .rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .rail-list li {
  position: relative;
}

.page-faq .rail-list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 0 7px 14px;
  font-size: 13px;
  line-height: 1.4;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease);
}

.page-faq .rail-list a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 13px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--line);
  transition: background var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}

.page-faq .rail-list a .num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--pitch);
}

.page-faq .rail-list a:hover,
.page-faq .rail-list a:focus-visible {
  color: var(--warm);
}

.page-faq .rail-list a:hover::before,
.page-faq .rail-list a:focus-visible::before {
  background: var(--orange);
  transform: scale(1.4);
}

/* ===== 平板 ===== */
@media (min-width: 720px) {
  .page-faq .faq-group {
    padding: 28px 28px 24px;
  }

  .page-faq .help-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .help-card--wide {
    grid-column: 1 / -1;
  }

  .page-faq .faq-group--split .faq-group__body {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 240px;
    gap: 26px;
    align-items: start;
  }
}

/* ===== 桌面 ===== */
@media (min-width: 1080px) {
  .page-faq .faq-hero {
    padding: calc(var(--topbar-h) + 64px) 0 72px;
  }

  .page-faq .faq-hero__art {
    right: -60px;
    bottom: -110px;
    width: 440px;
    height: 440px;
    opacity: .6;
  }

  .page-faq .faq-body {
    grid-template-columns: minmax(0, 1fr) 140px;
    gap: 44px;
  }

  .page-faq .faq-group {
    padding: 32px 34px 28px;
  }

  .page-faq .faq-group:nth-child(odd) {
    margin-left: 0;
    margin-right: 26px;
  }

  .page-faq .faq-group:nth-child(even) {
    margin-left: 26px;
    margin-right: 0;
  }

  .page-faq .faq-group--wide {
    margin-left: 0;
    margin-right: 0;
  }

  .page-faq .faq-rail {
    display: block;
    position: sticky;
    top: calc(var(--topbar-h) + 28px);
    padding-left: 18px;
    border-left: 1px solid var(--line);
  }

  .page-faq .faq-group--split .faq-group__body {
    grid-template-columns: minmax(0, 1fr) 280px;
  }
}

@media (min-width: 1320px) {
  .page-faq .faq-group:nth-child(odd) {
    margin-right: 46px;
  }

  .page-faq .faq-group:nth-child(even) {
    margin-left: 46px;
  }

  .page-faq .faq-group--wide {
    margin-left: 0;
    margin-right: 0;
  }
}

/* ===== 动效降级 ===== */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item[open] .steps li {
    animation: none;
  }

  .page-faq .faq-jump a:hover,
  .page-faq .faq-jump a:focus-visible {
    transform: none;
  }

  .page-faq .faq-group::before,
  .page-faq .rail-list a,
  .page-faq .rail-list a::before,
  .page-faq .faq-item > summary {
    transition: none;
  }
}