.page-faq {
  --faq-flow-gap: clamp(32px, 5vw, 80px);
  background: var(--ink);
  color: var(--white);
  padding-bottom: clamp(72px, 10vw, 160px);
  overflow-x: hidden;
}

.page-faq .breadcrumb {
  padding-top: clamp(18px, 3vw, 34px);
}

.page-faq .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--silver-dim);
}

.page-faq .breadcrumb-list a {
  color: var(--silver);
  text-decoration: none;
}

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

.page-faq .breadcrumb-list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  padding-block: clamp(28px, 5vw, 64px) clamp(40px, 6vw, 84px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -12%;
  width: 58%;
  height: 170%;
  background: linear-gradient(158deg, rgba(52, 245, 208, 0.07), rgba(52, 245, 208, 0) 62%);
  transform: rotate(-8deg);
  pointer-events: none;
}

.page-faq .faq-hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
  align-items: end;
}

.page-faq .kicker {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq h1 {
  margin: 0 0 22px;
  font-family: var(--font-head);
  font-weight: 300;
  font-size: clamp(30px, 5.6vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-faq .faq-hero-lede {
  max-width: 34em;
  margin: 0 0 34px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--silver);
}

.page-faq .faq-hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(22px, 4vw, 52px);
  margin: 0;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.page-faq .faq-stat dt {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--silver-dim);
}

.page-faq .faq-stat dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-faq .faq-hero-media {
  position: relative;
}

.page-faq .faq-hero-media::after {
  content: "";
  position: absolute;
  inset: 14px -14px -14px 14px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  pointer-events: none;
}

.page-faq .faq-hero-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 4;
  object-fit: cover;
  border: 1px solid var(--line);
  filter: saturate(0.85) contrast(1.05);
}

/* ---------- 主体两栏 ---------- */

.page-faq .faq-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-flow-gap);
  padding-top: clamp(40px, 6vw, 88px);
}

.page-faq .faq-rail {
  align-self: start;
}

.page-faq .index-label {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--silver-dim);
}

.page-faq .faq-tabs {
  display: grid;
  gap: 0;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-tab {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 14px;
  align-items: center;
  padding: 13px 2px 13px 10px;
  border-top: 1px solid var(--line);
  border-left: 2px solid transparent;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--silver);
  text-decoration: none;
  transition: border-color 0.24s var(--ease), color 0.24s var(--ease), background-color 0.24s var(--ease);
}

.page-faq .faq-tab-num {
  color: var(--silver-dim);
  transition: color 0.24s var(--ease);
}

.page-faq .faq-tab-count {
  font-size: 11px;
  color: var(--silver-dim);
}

.page-faq .faq-tab:hover,
.page-faq .faq-tab:focus-visible {
  border-left-color: var(--orange);
  background: rgba(255, 122, 26, 0.06);
  color: var(--white);
}

.page-faq .faq-tab.is-current {
  border-left-color: var(--cyan);
  background: rgba(52, 245, 208, 0.07);
  color: var(--white);
}

.page-faq .faq-tab.is-current .faq-tab-num {
  color: var(--orange);
}

.page-faq .faq-tab.is-current .faq-tab-label {
  color: var(--cyan);
}

/* ---------- 问答区 ---------- */

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

.page-faq .faq-group {
  padding-bottom: clamp(40px, 5vw, 72px);
}

.page-faq .faq-group + .faq-group {
  padding-top: clamp(4px, 1vw, 12px);
}

.page-faq .faq-group-head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 18px;
  align-items: baseline;
  padding-bottom: 20px;
  border-bottom: 2px solid var(--line);
}

.page-faq .faq-group-head .section-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-faq .faq-group-head h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 400;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.2;
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-faq .faq-group-desc {
  grid-column: 2 / -1;
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--silver);
}

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

.page-faq .faq-item summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 14px;
  align-items: start;
  padding: 20px 0 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-item summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-faq .faq-num {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-faq .faq-q {
  font-size: clamp(16px, 1.7vw, 19px);
  font-weight: 500;
  line-height: 1.55;
  color: var(--white);
  transition: color 0.24s var(--ease);
}

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

.page-faq .faq-mark {
  width: 9px;
  height: 9px;
  margin-top: 10px;
  border-right: 1px solid var(--silver-dim);
  border-bottom: 1px solid var(--silver-dim);
  transform: rotate(45deg);
  transition: transform 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-faq .faq-item[open] .faq-mark {
  transform: rotate(-135deg);
  border-color: var(--cyan);
}

.page-faq .faq-a {
  max-width: 40em;
  padding: 0 0 26px;
}

.page-faq .faq-a p {
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--silver);
}

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

.page-faq .faq-code {
  margin: 16px 0;
  padding: 14px 16px;
  overflow-x: auto;
  background: var(--panel);
  border-left: 2px solid var(--cyan);
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.9;
  letter-spacing: 0.01em;
  color: var(--cyan);
}

.page-faq .faq-tip {
  position: relative;
  padding-left: 22px;
  color: var(--white) !important;
}

.page-faq .faq-tip::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 0.62em;
  width: 8px;
  height: 8px;
  border-top: 1.5px solid var(--cyan);
  border-right: 1.5px solid var(--cyan);
  transform: rotate(45deg);
}

/* ---------- 提交区 ---------- */

.page-faq .faq-submit-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 46px);
  padding-top: 26px;
}

.page-faq .faq-submit-media {
  margin: 0;
  position: relative;
  max-width: 340px;
}

.page-faq .faq-submit-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border: 1px solid var(--line);
  filter: saturate(0.8);
}

.page-faq .faq-submit-media::after {
  content: "";
  position: absolute;
  inset: 0 -1px -1px 0;
  border-right: 2px solid rgba(255, 122, 26, 0.55);
  border-bottom: 2px solid rgba(255, 122, 26, 0.55);
  pointer-events: none;
}

.page-faq .faq-next {
  margin: 26px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--silver);
}

.page-faq .faq-next a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(52, 245, 208, 0.4);
}

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

/* ---------- 桌面栅格 ---------- */

@media (min-width: 900px) {
  .page-faq .faq-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-faq .faq-submit-grid {
    grid-template-columns: minmax(0, 3fr) minmax(0, 8fr);
    align-items: start;
  }
}

@media (min-width: 1040px) {
  .page-faq .faq-body {
    grid-template-columns: minmax(0, 3fr) minmax(0, 8fr);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 152px;
  }
}

@media (max-width: 640px) {
  .page-faq .faq-hero-media::after {
    display: none;
  }

  .page-faq .faq-hero-stats {
    gap: 22px;
  }

  .page-faq .faq-code {
    font-size: 11.5px;
    padding: 12px 13px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-tab,
  .page-faq .faq-mark,
  .page-faq .faq-q {
    transition: none;
  }
}