.page-faq {
  --faq-gap: clamp(20px, 3vw, 32px);
  --faq-card: rgba(20, 28, 63, 0.42);
  --faq-card-solid: rgba(6, 23, 38, 0.62);
  background: var(--ink);
  color: var(--porcelain);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-faq h2,
.page-faq h3 {
  font-family: var(--font-display);
  letter-spacing: -0.01em;
}

.page-faq a {
  color: inherit;
}

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

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  display: block;
  min-height: 0;
  padding: calc(var(--header-h) + clamp(36px, 6vw, 72px)) 0 clamp(46px, 6vw, 78px);
  background-color: var(--ink);
  background-image:
    radial-gradient(760px 460px at 86% 4%, rgba(37, 242, 214, 0.16), transparent 62%),
    radial-gradient(640px 440px at 2% 96%, rgba(255, 138, 61, 0.12), transparent 60%);
  background-repeat: no-repeat;
  border-bottom: 1px solid var(--line-soft);
  overflow: hidden;
}

.page-faq .faq-hero-grid {
  display: grid;
  gap: clamp(28px, 4vw, 40px);
  margin-top: clamp(28px, 4vw, 44px);
}

.page-faq .faq-hero h1 {
  margin: 10px 0 20px;
  max-width: 15em;
  font-size: clamp(34px, 6.4vw, 78px);
  font-weight: 900;
  line-height: 1.08;
}

.page-faq .faq-lede {
  max-width: 620px;
  margin: 0 0 28px;
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.8;
  color: rgba(244, 248, 249, 0.82);
}

.page-faq .faq-hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .faq-facts {
  display: grid;
  gap: 2px;
  margin: 0;
  border-top: 1px solid var(--line);
}

.page-faq .faq-fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 2px;
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-fact dt {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-faq .faq-fact dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--font-mono);
}

.page-faq .faq-fact .metric-value {
  font-size: clamp(26px, 3vw, 34px);
  font-weight: 700;
  color: var(--cyan);
  line-height: 1;
}

.page-faq .faq-fact .metric-unit {
  font-size: 12px;
  color: var(--mist);
}

.page-faq .faq-hero-anno {
  position: absolute;
  right: 14px;
  bottom: 72px;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--mist);
  opacity: 0.7;
  display: none;
}

/* ---------- 目录 ---------- */
.page-faq .faq-dir-grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.page-faq .faq-toc-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--mist);
}

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

.page-faq .faq-toc-list a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 12px;
  border-left: 2px solid transparent;
  border-radius: var(--r-sm);
  font-size: 15px;
  color: var(--mist);
  text-decoration: none;
  transition: color 0.24s var(--ease), background 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-faq .faq-toc-list a:hover {
  color: var(--porcelain);
  border-left-color: var(--cyan);
  background: rgba(37, 242, 214, 0.06);
}

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

.page-faq .faq-dir-main {
  display: grid;
  gap: var(--faq-gap);
}

.page-faq .faq-dir-figure {
  margin: 0;
  border-radius: var(--r-xl);
  overflow: hidden;
}

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

.page-faq .faq-index {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
}

.page-faq .faq-index-link {
  display: grid;
  gap: 7px;
  height: 100%;
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--faq-card);
  text-decoration: none;
  transition: border-color 0.24s var(--ease), transform 0.24s var(--ease), background 0.24s var(--ease);
}

.page-faq .faq-index-link:hover {
  border-color: var(--line-cyan);
  background: rgba(20, 28, 63, 0.66);
  transform: translateY(-3px);
}

.page-faq .faq-index-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-faq .faq-index-title {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--porcelain);
}

.page-faq .faq-index-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 章节通用 ---------- */
.page-faq .faq-sec {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-faq .faq-sec-head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-faq .faq-sec-num {
  flex: none;
  padding: 5px 11px;
  border-radius: var(--r-pill);
  background: var(--cyan);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  transition: background 0.24s var(--ease), color 0.24s var(--ease);
}

.page-faq .faq-sec:target .faq-sec-num {
  background: var(--orange);
  color: var(--ink);
}

.page-faq .faq-sec-head h2 {
  margin: 0;
  font-size: clamp(24px, 3.6vw, 40px);
  font-weight: 800;
  line-height: 1.2;
}

.page-faq .faq-sec-head--wine .faq-sec-num {
  background: var(--amber);
}

.page-faq .faq-sec-lede {
  max-width: 680px;
  margin: 0 0 clamp(24px, 3vw, 36px);
  font-size: 16px;
  line-height: 1.8;
  color: rgba(244, 248, 249, 0.84);
}

.page-faq .faq-note {
  max-width: 680px;
  margin: 24px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--line-cyan);
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

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

/* ---------- 01 步骤 ---------- */
.page-faq .faq-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
  grid-template-columns: 1fr;
}

.page-faq .faq-step {
  padding-top: 18px;
  border-top: 2px solid var(--line-cyan);
}

.page-faq .faq-step-num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-faq .faq-step h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
}

.page-faq .faq-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 02 账号 ---------- */
.page-faq .faq-auth-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}

.page-faq .faq-auth-card {
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: rgba(6, 23, 38, 0.48);
}

.page-faq .faq-auth-card--accent {
  border-color: var(--line-cyan);
  background: rgba(37, 242, 214, 0.08);
}

.page-faq .faq-auth-card h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
}

.page-faq .faq-auth-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(244, 248, 249, 0.82);
}

/* ---------- 03 平板端报价 ---------- */
.page-faq .faq-tier-figure {
  margin: 0 0 clamp(26px, 3vw, 38px);
  border-radius: var(--r-xl);
  overflow: hidden;
}

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

.page-faq .faq-tier-tabs .tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-faq .faq-tier-tabs .tab {
  padding: 12px 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: rgba(6, 23, 38, 0.5);
  color: var(--porcelain);
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.24s var(--ease), color 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-faq .faq-tier-tabs .tab:hover {
  border-color: var(--line-cyan);
}

.page-faq .faq-tier-tabs .tab[aria-selected="true"],
.page-faq .faq-tier-tabs .tab.is-active {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}

.page-faq .faq-tier-tabs .tab-panel {
  margin-top: 20px;
  padding: clamp(22px, 3vw, 34px);
  border: 1px solid var(--line-cyan);
  border-radius: var(--r-xl);
  background: rgba(6, 23, 38, 0.56);
}

.page-faq .faq-tier-name {
  margin: 0 0 10px;
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 800;
  color: var(--amber);
}

.page-faq .faq-tier-for {
  max-width: 620px;
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(244, 248, 249, 0.82);
}

.page-faq .faq-spec {
  margin: 0;
  display: grid;
}

.page-faq .faq-spec-row {
  display: grid;
  gap: 4px;
  padding: 15px 0;
  border-bottom: 1px dashed var(--line);
}

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

.page-faq .faq-spec dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-faq .faq-spec dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--porcelain);
}

.page-faq .faq-cycle {
  margin-top: clamp(28px, 3vw, 40px);
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.page-faq .faq-cycle-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--mist);
}

.page-faq .faq-cycle-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-faq .faq-cycle-list .pill {
  background: rgba(232, 199, 102, 0.14);
  border: 1px solid rgba(232, 199, 102, 0.42);
  color: var(--amber);
}

/* ---------- 04 统计与更新 ---------- */
.page-faq .faq-sources {
  list-style: none;
  margin: 0 0 clamp(28px, 3vw, 40px);
  padding: 0;
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}

.page-faq .faq-source {
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  border-radius: var(--r-md);
  background: var(--faq-card);
}

.page-faq .faq-source-tag {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-faq .faq-source h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
}

.page-faq .faq-source p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.page-faq .faq-rhythm {
  display: grid;
  gap: 18px;
  grid-template-columns: 1fr;
}

.page-faq .faq-rhythm-item {
  padding: 22px 24px;
  border-radius: var(--r-lg);
  background: var(--faq-card-solid);
  border: 1px solid var(--line-soft);
}

.page-faq .faq-rhythm-num {
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-faq .faq-rhythm-unit {
  margin-left: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mist);
}

.page-faq .faq-rhythm-item p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(244, 248, 249, 0.82);
}

/* ---------- 05 故障 ---------- */
.page-faq .faq-fault {
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: rgba(6, 23, 38, 0.5);
  overflow: hidden;
}

.page-faq .faq-fault + .faq-fault {
  margin-top: 12px;
}

.page-faq .faq-fault summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 22px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--porcelain);
}

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

.page-faq .faq-fault summary::after {
  content: "▾";
  margin-left: auto;
  color: var(--cyan);
  font-size: 14px;
  transition: transform 0.24s var(--ease);
}

.page-faq .faq-fault[open] summary::after {
  transform: rotate(180deg);
}

.page-faq .faq-fault-num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--signal);
}

.page-faq .faq-fault-body {
  padding: 0 22px 20px 58px;
}

.page-faq .faq-fault-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 06 联系 ---------- */
.page-faq .faq-contact-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}

.page-faq .faq-contact-card {
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--faq-card);
}

.page-faq .faq-contact-key {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-faq .faq-contact-card .contact-value {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  color: var(--cyan);
  word-break: break-word;
}

.page-faq .faq-contact-card .faq-contact-hint {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .faq-next {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-top: clamp(28px, 3vw, 40px);
  padding: clamp(22px, 3vw, 32px);
  border-radius: var(--r-xl);
  border: 1px solid var(--line-cyan);
  background: linear-gradient(120deg, rgba(37, 242, 214, 0.1), rgba(255, 138, 61, 0.08));
}

.page-faq .faq-next-text {
  flex: 1 1 280px;
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(244, 248, 249, 0.88);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-faq .faq-contact-grid .faq-contact-card:first-child {
    grid-column: span 2;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero-grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(260px, 0.55fr);
    align-items: end;
    gap: clamp(36px, 5vw, 72px);
  }

  .page-faq .faq-hero-anno {
    display: block;
  }

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

  .page-faq .faq-toc {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-faq .faq-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 22px;
  }

  .page-faq .faq-auth-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

  .page-faq .faq-contact-grid .faq-contact-card:first-child {
    grid-column: auto;
  }

  .page-faq .faq-tier-tabs .tab-panel {
    padding: clamp(26px, 3vw, 40px);
  }

  .page-faq .faq-spec-row {
    grid-template-columns: 170px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index-link,
  .page-faq .faq-toc-list a,
  .page-faq .faq-tier-tabs .tab,
  .page-faq .faq-fault summary::after,
  .page-faq .faq-sec-num {
    transition: none;
  }

  .page-faq .faq-index-link:hover {
    transform: none;
  }
}