.page-faq {
  --faq-side: 236px;
  --faq-sticky: calc(var(--header-h) + 20px);
  background: var(--ink);
  color: var(--silver);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  padding-block: clamp(22px, 4vw, 46px) clamp(30px, 5vw, 56px);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(88% 120% at 90% -6%, rgba(59, 255, 154, .16), transparent 58%),
    radial-gradient(72% 96% at 4% 8%, rgba(110, 127, 168, .24), transparent 64%),
    repeating-linear-gradient(90deg, rgba(198, 211, 223, .055) 0 1px, transparent 1px 84px);
}

.page-faq .faq-hero .breadcrumb {
  margin-bottom: 22px;
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: 24px;
}

.page-faq .faq-hero h1 {
  margin: 0 0 16px;
  font-size: clamp(1.85rem, 1.1rem + 3.3vw, 3.35rem);
  line-height: 1.16;
  letter-spacing: -.02em;
  font-weight: 800;
  color: var(--paper);
}

.page-faq .faq-hero h1 em {
  font-style: normal;
  color: var(--green);
}

.page-faq .faq-hero .lede {
  margin: 0;
  max-width: var(--measure);
  font-size: clamp(.96rem, .9rem + .3vw, 1.08rem);
  line-height: 1.85;
  color: var(--silver);
}

.page-faq .faq-hero__panel {
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--glass);
  box-shadow: var(--shadow-soft);
}

.page-faq .faq-hero__panel .annot {
  display: block;
  margin-bottom: 14px;
  color: var(--green);
}

.page-faq .faq-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
}

.page-faq .faq-stats .stat__value {
  font-size: clamp(1.3rem, 1rem + 1.4vw, 1.85rem);
  line-height: 1.1;
}

.page-faq .faq-stats .stat__label {
  font-size: .76rem;
  line-height: 1.5;
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: end;
    gap: 40px;
  }
}

/* ---------- 主体 ---------- */
.page-faq .faq-body {
  padding-block: clamp(20px, 3vw, 36px) clamp(48px, 7vw, 96px);
  background: linear-gradient(180deg, var(--ink) 0%, var(--ink-deep) 100%);
}

.page-faq .faq-layout {
  display: grid;
  gap: 26px;
}

/* ---------- 左栏索引 ---------- */
.page-faq .faq-side {
  display: grid;
  gap: 12px;
  min-width: 0;
}

.page-faq .faq-side__annot {
  color: rgba(198, 211, 223, .5);
}

.page-faq .faq-index {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

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

.page-faq .faq-index a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 15px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-capsule);
  color: var(--silver);
  font-size: .86rem;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .faq-index a:hover,
.page-faq .faq-index a:focus-visible {
  border-color: var(--green);
  color: var(--green);
  background: rgba(59, 255, 154, .08);
}

.page-faq .faq-index .num {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .06em;
  color: var(--amber);
}

.page-faq .faq-side__note {
  padding: 14px 16px;
  border-left: 2px solid var(--green);
  background: rgba(11, 27, 43, .55);
  border-radius: 0 12px 12px 0;
}

.page-faq .faq-side__note p {
  margin: 0 0 10px;
  font-size: .82rem;
  line-height: 1.75;
  color: rgba(198, 211, 223, .78);
}

.page-faq .faq-side__link {
  font-size: .82rem;
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid rgba(59, 255, 154, .35);
  transition: border-color var(--dur) var(--ease);
}

.page-faq .faq-side__link:hover {
  border-color: var(--green);
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-main {
  display: grid;
  gap: 22px;
  min-width: 0;
}

.page-faq .faq-group {
  --faq-line: var(--line);
  --faq-text: var(--silver);
  --faq-strong: var(--paper);
  --faq-accent: var(--green);
  padding: clamp(18px, 2.6vw, 34px);
  border: 1px solid var(--faq-line);
  border-radius: var(--radius-card);
  scroll-margin-top: calc(var(--header-h) + 24px);
  transition: border-color var(--dur) var(--ease);
}

.page-faq .faq-group--paper {
  --faq-line: rgba(11, 27, 43, .16);
  --faq-text: rgba(11, 27, 43, .78);
  --faq-strong: var(--ink);
  --faq-accent: var(--pitch);
  background: var(--paper);
  color: var(--ink);
}

.page-faq .faq-group--ink {
  background: linear-gradient(155deg, rgba(15, 59, 51, .6), rgba(6, 14, 22, .94) 64%);
  color: var(--silver);
}

.page-faq .faq-group--help {
  border-color: rgba(59, 255, 154, .34);
}

.page-faq .faq-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  margin-bottom: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-group__idx {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .22em;
  color: var(--faq-accent);
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(1.18rem, 1rem + 1.1vw, 1.7rem);
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -.01em;
  color: var(--faq-strong);
}

.page-faq .faq-group__note {
  margin-left: auto;
  font-size: .78rem;
  line-height: 1.5;
  color: var(--faq-text);
}

.page-faq .faq-group__lede {
  margin: 0 0 20px;
  max-width: 46em;
  font-size: .93rem;
  line-height: 1.85;
  color: var(--faq-text);
}

/* 图 */
.page-faq .faq-figure {
  margin: 0 0 20px;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: calc(var(--radius-card) - 4px);
}

.page-faq .faq-figure .figure__cap {
  margin-top: 8px;
  font-size: .76rem;
  line-height: 1.6;
  color: var(--faq-text);
}

/* 时间轴 */
.page-faq .timeline {
  display: grid;
  gap: 12px;
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
}

.page-faq .timeline li {
  padding: 4px 0 4px 14px;
  border-left: 2px solid var(--faq-line);
}

.page-faq .timeline li.is-current {
  border-left-color: var(--amber);
  box-shadow: -6px 0 18px -12px var(--amber);
}

.page-faq .timeline__time {
  display: block;
  font-family: var(--font-mono);
  font-size: .86rem;
  color: var(--amber);
}

.page-faq .timeline__title {
  display: block;
  margin: 4px 0 3px;
  font-size: .95rem;
  font-weight: 700;
  color: var(--faq-strong);
}

.page-faq .timeline__desc {
  display: block;
  font-size: .84rem;
  line-height: 1.7;
  color: var(--faq-text);
}

/* 三步编号 */
.page-faq .faq-steps {
  display: grid;
  gap: 12px;
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
}

.page-faq .faq-steps li {
  padding: 16px 16px 14px;
  border: 1px solid var(--faq-line);
  border-radius: 12px;
  background: rgba(11, 27, 43, .04);
}

.page-faq .faq-group--ink .faq-steps li {
  background: rgba(198, 211, 223, .05);
}

.page-faq .faq-steps .num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 1.6rem;
  line-height: 1;
  color: var(--amber);
}

.page-faq .faq-steps__t {
  display: block;
  margin-bottom: 6px;
  font-size: .95rem;
  font-weight: 700;
  color: var(--faq-strong);
}

.page-faq .faq-steps__d {
  display: block;
  font-size: .84rem;
  line-height: 1.7;
  color: var(--faq-text);
}

/* 数据表 */
.page-faq .faq-table-wrap {
  margin: 0 0 22px;
  overflow-x: auto;
}

.page-faq .data-table {
  width: 100%;
  min-width: 480px;
  border-collapse: collapse;
  font-size: .86rem;
}

.page-faq .data-table th,
.page-faq .data-table td {
  padding: 11px 12px;
  text-align: left;
  border-bottom: 1px solid var(--faq-line);
  vertical-align: top;
}

.page-faq .data-table th {
  font-size: .74rem;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--faq-text);
}

.page-faq .data-table td {
  color: var(--faq-strong);
  line-height: 1.65;
}

.page-faq .data-table .num {
  font-family: var(--font-mono);
  color: var(--faq-text);
  white-space: nowrap;
}

/* 问答列表 */
.page-faq .faq-list {
  display: grid;
}

.page-faq .faq-item {
  border-top: 1px solid var(--faq-line);
}

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

.page-faq .faq-item summary {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 20px;
  align-items: start;
  gap: 16px;
  padding: 15px 4px;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-item summary:focus-visible {
  outline: 1px solid var(--faq-accent);
  outline-offset: 3px;
}

.page-faq .faq-q {
  font-size: .97rem;
  font-weight: 600;
  line-height: 1.65;
  color: var(--faq-strong);
  transition: color var(--dur) var(--ease);
}

.page-faq .faq-q::before {
  content: "Q";
  margin-right: 8px;
  font-family: var(--font-mono);
  font-size: .82rem;
  font-weight: 500;
  color: var(--faq-accent);
}

.page-faq .faq-item summary:hover .faq-q {
  color: var(--faq-accent);
}

.page-faq .faq-mark {
  position: relative;
  width: 18px;
  height: 18px;
  margin-top: 5px;
}

.page-faq .faq-mark::before,
.page-faq .faq-mark::after {
  content: "";
  position: absolute;
  background: var(--faq-text);
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .faq-mark::before {
  left: 0;
  right: 0;
  top: 8px;
  height: 1.5px;
}

.page-faq .faq-mark::after {
  top: 0;
  bottom: 0;
  left: 8px;
  width: 1.5px;
}

.page-faq .faq-item[open] .faq-mark::after {
  transform: scaleY(0);
}

.page-faq .faq-item[open] .faq-mark::before {
  background: var(--faq-accent);
}

.page-faq .faq-a {
  max-width: 48em;
  padding: 0 4px 20px;
  font-size: .92rem;
  line-height: 1.85;
  color: var(--faq-text);
}

.page-faq .faq-a p {
  margin: 0 0 12px;
}

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

.page-faq .faq-a ol,
.page-faq .faq-a ul {
  margin: 0 0 12px;
  padding-left: 1.25em;
}

.page-faq .faq-a li {
  margin-bottom: 6px;
}

.page-faq .faq-a strong {
  font-weight: 700;
  color: var(--faq-strong);
}

.page-faq .faq-a a {
  color: var(--faq-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-return {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
  font-size: .78rem;
  letter-spacing: .04em;
  color: var(--faq-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease);
}

.page-faq .faq-return::before {
  content: "\2191";
  font-family: var(--font-mono);
}

.page-faq .faq-return:hover {
  border-color: var(--faq-accent);
}

/* 联系准备 */
.page-faq .faq-prep {
  display: grid;
  gap: 10px;
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
}

.page-faq .faq-prep li {
  position: relative;
  padding-left: 22px;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--faq-text);
}

.page-faq .faq-prep li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: .6em;
  width: 8px;
  height: 8px;
  border: 1px solid var(--faq-accent);
  border-radius: 2px;
  transform: rotate(45deg);
}

.page-faq .faq-contact {
  display: grid;
  gap: 12px;
  margin: 0 0 22px;
}

.page-faq .faq-contact > div {
  padding: 14px 16px;
  border: 1px solid var(--faq-line);
  border-radius: 12px;
}

.page-faq .faq-contact dt {
  margin-bottom: 6px;
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--faq-text);
}

.page-faq .faq-contact dd {
  margin: 0;
  font-size: .9rem;
  line-height: 1.6;
  color: var(--faq-strong);
  word-break: break-word;
}

.page-faq .faq-group--help .btn {
  margin-top: 4px;
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 760px) {
  .page-faq .faq-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-side) minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

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

  .page-faq .faq-index {
    flex-direction: column;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-faq .faq-index a {
    width: 100%;
    justify-content: flex-start;
  }

  .page-faq .faq-group__head {
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-mark::before,
  .page-faq .faq-mark::after,
  .page-faq .faq-q,
  .page-faq .faq-index a,
  .page-faq .faq-return {
    transition: none;
  }
}