.page-faq {
  --faq-sticky-top: 24px;
  --faq-hairline: 1px solid var(--line-moss);
  position: relative;
  padding-bottom: clamp(48px, 8vw, 104px);
  overflow-x: hidden;
}

.page-faq::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 720px;
  background:
    radial-gradient(60% 80% at 18% 0%, rgba(53, 232, 208, 0.10), transparent 70%),
    radial-gradient(50% 70% at 88% 12%, rgba(255, 122, 47, 0.08), transparent 72%);
  pointer-events: none;
  z-index: 0;
}

.page-faq > * {
  position: relative;
  z-index: 1;
}

.page-faq .visually-hidden-faq {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  padding: clamp(20px, 4vw, 44px) 0 clamp(28px, 5vw, 60px);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  align-items: end;
}

.page-faq .faq-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 0.98;
  font-size: clamp(38px, 8.5vw, 86px);
  color: var(--text-primary);
}

.page-faq .faq-hero__mark {
  color: var(--accent-cyan);
  display: inline-block;
}

.page-faq .faq-hero__desc {
  margin: 20px 0 0;
  max-width: 54ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.75;
  color: var(--text-secondary);
}

.page-faq .faq-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin: 28px 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: var(--faq-hairline);
}

.page-faq .faq-fact {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-faq .faq-fact__num {
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  color: var(--accent-cyan);
  line-height: 1;
}

.page-faq .faq-fact__label {
  font-size: 13px;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

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

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

.page-faq .faq-hero__cap {
  margin: 12px 0 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--text-muted);
}

/* ---------- 看板主体 ---------- */

.page-faq .faq-board {
  padding: clamp(24px, 4vw, 48px) 0;
}

.page-faq .faq-board__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-faq .faq-index {
  border: var(--faq-hairline);
  border-radius: var(--r-lg);
  background: var(--bg-deep-moss);
  padding: 20px 22px;
}

.page-faq .faq-index__title {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--accent-cyan);
}

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

.page-faq .faq-index__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 10px;
  border-radius: var(--r-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  transition: background 180ms ease, color 180ms ease;
}

.page-faq .faq-index__list a .mono {
  font-size: 11px;
  color: var(--text-muted);
}

.page-faq .faq-index__list a:hover,
.page-faq .faq-index__list a:focus-visible {
  background: var(--surface-raised);
  color: var(--text-primary);
  outline: none;
}

.page-faq .faq-index__list a:focus-visible {
  box-shadow: 0 0 0 2px var(--accent-cyan);
}

.page-faq .faq-index__foot {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: var(--faq-hairline);
  font-size: 12px;
  line-height: 1.7;
  color: var(--text-muted);
}

.page-faq .faq-main {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  min-width: 0;
}

.page-faq .faq-group {
  scroll-margin-top: 90px;
}

.page-faq .faq-group__head {
  padding-bottom: 16px;
  border-bottom: var(--faq-hairline);
}

.page-faq .faq-group__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.01em;
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1.2;
  color: var(--text-primary);
  transition: color 200ms ease;
}

.page-faq .faq-group__lead {
  margin: 12px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-secondary);
}

.page-faq .faq-group:target .faq-group__title {
  color: var(--accent-cyan);
}

/* ---------- 术语表 ---------- */

.page-faq .term-list {
  margin: 20px 0 0;
  display: grid;
  gap: 10px;
}

.page-faq .term {
  border: var(--faq-hairline);
  border-radius: var(--r-md);
  background: var(--surface-panel);
  padding: 16px 18px;
  transition: border-color 180ms ease, background 180ms ease;
}

.page-faq .term:hover {
  border-color: rgba(53, 232, 208, 0.4);
  background: var(--surface-raised);
}

.page-faq .term__k {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--accent-cyan);
}

.page-faq .term__v {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-secondary);
}

/* ---------- 问答手风琴 ---------- */

.page-faq .qa {
  border: var(--faq-hairline);
  border-radius: var(--r-lg);
  background: var(--surface-panel);
  margin-top: 12px;
  overflow: hidden;
  transition: border-color 180ms ease;
}

.page-faq .qa[open] {
  border-color: rgba(53, 232, 208, 0.45);
}

.page-faq .qa__q {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--text-primary);
}

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

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

.page-faq .qa__num {
  flex: none;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--accent-cyan);
  padding: 3px 8px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(53, 232, 208, 0.35);
  transform: translateY(-1px);
}

.page-faq .qa__text {
  flex: 1 1 auto;
}

.page-faq .qa__q::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--text-muted);
  transition: transform 200ms ease, color 200ms ease;
}

.page-faq .qa[open] .qa__q::after {
  content: "–";
  color: var(--accent-cyan);
}

.page-faq .qa__a {
  padding: 0 18px 18px;
  border-top: var(--faq-hairline);
  margin-top: -1px;
  padding-top: 14px;
}

.page-faq .qa__a p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-secondary);
}

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

/* ---------- 纠错步骤 ---------- */

.page-faq .fix-steps {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
  counter-reset: none;
}

.page-faq .fix-step {
  position: relative;
  border: var(--faq-hairline);
  border-radius: var(--r-md);
  background: var(--surface-panel);
  padding: 16px 18px 16px 62px;
}

.page-faq .fix-step__n {
  position: absolute;
  left: 18px;
  top: 16px;
  font-size: 13px;
  font-weight: 700;
  color: var(--accent-orange);
}

.page-faq .fix-step__t {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
}

.page-faq .fix-step__d {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-secondary);
}

.page-faq .fix-mail {
  margin: 18px 0 0;
  padding: 16px 18px;
  border-radius: var(--r-md);
  background: var(--surface-raised);
  border: 1px solid rgba(53, 232, 208, 0.28);
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-secondary);
}

.page-faq .fix-mail a {
  color: var(--accent-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 232, 208, 0.5);
}

.page-faq .fix-mail a:hover,
.page-faq .fix-mail a:focus-visible {
  color: var(--text-primary);
  border-bottom-color: var(--text-primary);
  outline: none;
}

/* ---------- 右侧旁注 ---------- */

.page-faq .faq-notes {
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-faq .note-card {
  border: var(--faq-hairline);
  border-radius: var(--r-lg);
  background: var(--bg-deep-moss);
  padding: 18px;
}

.page-faq .note-card--warn {
  border-color: rgba(255, 122, 47, 0.4);
}

.page-faq .note-card__k {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--accent-orange);
}

.page-faq .note-card__t {
  margin: 10px 0 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
}

.page-faq .note-card__d {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--text-secondary);
}

/* ---------- 更新节奏 ---------- */

.page-faq .faq-rhythm {
  padding: clamp(32px, 5vw, 64px) 0;
  border-top: var(--faq-hairline);
  scroll-margin-top: 90px;
}

.page-faq .faq-rhythm__head {
  max-width: 68ch;
}

.page-faq .faq-rhythm__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.01em;
  font-size: clamp(24px, 4vw, 40px);
  line-height: 1.15;
  color: var(--text-primary);
}

.page-faq .faq-rhythm__lead {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-secondary);
}

.page-faq .faq-rhythm__grid {
  margin: 24px 0 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-faq .rhythm-card {
  border: var(--faq-hairline);
  border-radius: var(--r-lg);
  background: var(--surface-panel);
  padding: 18px;
  position: relative;
  overflow: hidden;
}

.page-faq .rhythm-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--accent-gold);
}

.page-faq .rhythm-card__k {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--accent-gold);
}

.page-faq .rhythm-card__t {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  color: var(--text-primary);
}

.page-faq .rhythm-card__d {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--text-secondary);
}

.page-faq .faq-rhythm__figure {
  margin: 26px 0 0;
}

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

.page-faq .faq-rhythm__cap {
  margin: 12px 0 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--text-muted);
}

.page-faq .faq-rhythm__delay {
  margin: 28px 0 0;
  padding: 22px;
  border-radius: var(--r-lg);
  background: var(--bg-deep-moss);
  border: var(--faq-hairline);
}

.page-faq .faq-rhythm__sub {
  margin: 0 0 12px;
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
}

.page-faq .faq-rhythm__delay p {
  margin: 0 0 10px;
  max-width: 76ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-secondary);
}

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

/* ---------- 延伸入口 ---------- */

.page-faq .faq-next {
  padding: 0 0 clamp(16px, 3vw, 32px);
}

.page-faq .faq-next__panel {
  border: var(--faq-hairline);
  border-radius: var(--r-xl);
  background:
    linear-gradient(160deg, rgba(53, 232, 208, 0.10), transparent 58%),
    var(--bg-deep-moss);
  padding: clamp(22px, 4vw, 40px);
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  grid-template-columns: 1fr;
}

.page-faq .faq-next__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.01em;
  font-size: clamp(24px, 4vw, 38px);
  line-height: 1.15;
  color: var(--text-primary);
}

.page-faq .faq-next__lead {
  margin: 12px 0 0;
  max-width: 46ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-secondary);
}

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

.page-faq .faq-next__link {
  display: block;
  padding: 14px 16px;
  border-radius: var(--r-md);
  border: var(--faq-hairline);
  background: rgba(8, 17, 15, 0.5);
  text-decoration: none;
  transition: border-color 180ms ease, background 180ms ease, transform 180ms ease;
}

.page-faq .faq-next__link:hover,
.page-faq .faq-next__link:focus-visible {
  border-color: var(--accent-cyan);
  background: var(--surface-raised);
  transform: translateX(4px);
  outline: none;
}

.page-faq .faq-next__link-t {
  display: block;
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
}

.page-faq .faq-next__link-d {
  display: block;
  margin-top: 4px;
  font-size: 12.5px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ---------- 响应式 ---------- */

@media (min-width: 768px) {
  .page-faq .faq-hero__facts {
    gap: 10px 44px;
  }

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

  .page-faq .fix-steps {
    grid-template-columns: 1fr;
  }

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

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

  .page-faq .faq-next__panel {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: center;
  }

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

@media (min-width: 1024px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-faq .faq-board__grid {
    grid-template-columns: minmax(180px, 3fr) minmax(0, 6fr) minmax(200px, 3fr);
    gap: clamp(22px, 2.6vw, 36px);
    align-items: start;
  }

  .page-faq .faq-index,
  .page-faq .faq-notes {
    position: sticky;
    top: var(--faq-sticky-top);
  }

  .page-faq .faq-notes {
    grid-template-columns: 1fr;
  }

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

  .page-faq .term-list .term:nth-child(3n + 1) {
    grid-column: span 2;
  }
}

@media (min-width: 1280px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 4fr);
    gap: 64px;
  }

  .page-faq .faq-hero__figure {
    margin-top: -32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .term,
  .page-faq .qa,
  .page-faq .qa__q::after,
  .page-faq .faq-index__list a,
  .page-faq .faq-next__link,
  .page-faq .faq-group__title {
    transition: none;
  }

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