.page-faq {
  color: var(--sg-cream);
  font-family: var(--sg-font-body);
  background:
    radial-gradient(760px 360px at 8% -4%, rgba(47, 227, 255, 0.16), transparent 68%),
    radial-gradient(680px 340px at 96% 2%, rgba(246, 196, 83, 0.13), transparent 70%),
    var(--sg-ink);
  overflow-x: hidden;
}

.page-faq a {
  color: inherit;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-head {
  padding-top: clamp(26px, 4vw, 56px);
  padding-bottom: clamp(34px, 6vw, 76px);
}

.page-faq .faq-kicker {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--sg-cyan);
}

.page-faq .faq-head__layout {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(22px, 4vw, 40px);
}

.page-faq .faq-head h1 {
  margin: 0 0 18px;
  font-family: var(--sg-font-display);
  font-size: clamp(32px, 7.2vw, 72px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--sg-cream);
  text-shadow: 0 0 30px rgba(246, 196, 83, 0.22);
}

.page-faq .faq-head__intro {
  margin: 0;
  max-width: 48ch;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.85;
  color: rgba(245, 240, 229, 0.84);
}

.page-faq .faq-head__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-faq .faq-quick {
  padding: 20px 22px;
  border: 2px solid var(--sg-line);
  border-radius: var(--sg-radius);
  background: linear-gradient(160deg, rgba(18, 20, 29, 0.96), rgba(7, 8, 13, 0.96));
  box-shadow: var(--sg-shadow-hard);
}

.page-faq .faq-quick__title {
  margin: 0 0 6px;
  font-family: var(--sg-font-display);
  font-size: 15px;
  letter-spacing: 0.16em;
  color: var(--sg-gold);
}

.page-faq .faq-quick__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-quick__list li {
  display: grid;
  gap: 4px;
  padding: 13px 0;
  border-bottom: 1px dashed var(--sg-line-soft);
}

.page-faq .faq-quick__list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-faq .faq-quick__list a {
  font-weight: 600;
  font-size: 16px;
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-faq .faq-quick__list a:hover,
.page-faq .faq-quick__list a:focus-visible {
  color: var(--sg-gold);
  border-bottom-color: var(--sg-line);
}

.page-faq .faq-quick__list span {
  font-size: 13px;
  line-height: 1.7;
  color: var(--sg-mist);
}

/* ---------- 章节标题 ---------- */
.page-faq .faq-sec-head {
  max-width: 62ch;
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-faq .faq-sec-head__index {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--sg-cyan);
}

.page-faq .faq-sec-head h2 {
  margin: 0 0 12px;
  font-family: var(--sg-font-display);
  font-size: clamp(23px, 3.4vw, 40px);
  font-weight: 800;
  line-height: 1.22;
}

.page-faq .faq-sec-head__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--sg-mist);
}

/* ---------- 三栏滑轨 ---------- */
.page-faq .faq-rail-sec {
  background: linear-gradient(180deg, rgba(18, 20, 29, 0.92), rgba(18, 20, 29, 0));
  border-top: 1px solid var(--sg-line-soft);
  border-bottom: 1px solid var(--sg-line-soft);
}

.page-faq .faq-rail-visual {
  margin-bottom: clamp(18px, 3vw, 28px);
  border: 2px solid var(--sg-line);
  border-radius: var(--sg-radius);
  box-shadow: var(--sg-shadow-hard);
  overflow: hidden;
}

.page-faq .faq-rail-visual img {
  display: block;
  width: 100%;
  height: clamp(150px, 24vw, 280px);
  object-fit: cover;
}

.page-faq .faq-rail {
  display: flex;
  gap: clamp(12px, 2vw, 20px);
  padding: 4px 4px 18px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-color: var(--sg-amber) transparent;
  scrollbar-width: thin;
}

.page-faq .faq-rail__panel {
  flex: 0 0 min(86%, 360px);
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 20px;
  border: 2px solid var(--sg-line-soft);
  border-radius: var(--sg-radius);
  background: var(--sg-graphite);
}

.page-faq .faq-rail__panel--cyan {
  border-color: var(--sg-line-cyan);
  box-shadow: 6px 6px 0 rgba(47, 227, 255, 0.14);
}

.page-faq .faq-rail__panel--gold {
  border-color: var(--sg-line);
  box-shadow: 6px 6px 0 rgba(246, 196, 83, 0.14);
}

.page-faq .faq-rail__panel--rose {
  border-color: var(--sg-line-rose);
  box-shadow: 6px 6px 0 rgba(255, 79, 144, 0.14);
}

.page-faq .faq-rail__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-faq .faq-rail__code {
  margin: 0;
  font-size: 34px;
  font-weight: 800;
  line-height: 1;
}

.page-faq .faq-rail__panel--cyan .faq-rail__code { color: var(--sg-cyan); }
.page-faq .faq-rail__panel--gold .faq-rail__code { color: var(--sg-gold); }
.page-faq .faq-rail__panel--rose .faq-rail__code { color: var(--sg-rose); }

.page-faq .faq-rail__name {
  margin: 0;
  font-family: var(--sg-font-display);
  font-size: 20px;
  font-weight: 800;
}

.page-faq .faq-rail__fit {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(245, 240, 229, 0.82);
}

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

.page-faq .faq-rail__list li {
  padding-bottom: 10px;
  border-bottom: 1px solid var(--sg-line-soft);
  font-size: 13px;
  line-height: 1.7;
  color: var(--sg-mist);
}

.page-faq .faq-rail__list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-faq .faq-rail__list .sg-mono {
  display: block;
  margin-bottom: 2px;
  font-size: 12px;
  color: var(--sg-cream);
  letter-spacing: 0.04em;
}

.page-faq .faq-rail__note {
  margin: 0;
  font-size: 12px;
  line-height: 1.75;
  color: var(--sg-mist);
  opacity: 0.86;
}

/* ---------- 按关卡定位 ---------- */
.page-faq .faq-locate__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(18px, 3vw, 26px);
}

.page-faq .faq-locate__tags a {
  padding: 6px 14px;
  font-family: var(--sg-font-mono);
  font-size: 13px;
  text-decoration: none;
  color: var(--sg-cyan);
  border: 1px solid var(--sg-line-cyan);
  border-radius: 999px;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-faq .faq-locate__tags a:hover,
.page-faq .faq-locate__tags a:focus-visible {
  color: var(--sg-ink);
  background: var(--sg-cyan);
  border-color: var(--sg-cyan);
}

.page-faq .faq-cases {
  display: grid;
  gap: 14px;
}

.page-faq .faq-case {
  padding: 16px 18px;
  border: 1px solid var(--sg-line-soft);
  border-left: 3px solid var(--sg-cyan);
  border-radius: var(--sg-radius-sm);
  background: rgba(18, 20, 29, 0.72);
}

.page-faq .faq-case summary {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  font-size: 15px;
  line-height: 1.65;
}

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

.page-faq .faq-case summary::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--sg-font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--sg-cyan);
}

.page-faq .faq-case[open] summary::after {
  content: "−";
  color: var(--sg-gold);
}

.page-faq .faq-case__body {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--sg-line-soft);
}

.page-faq .faq-case__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  margin: 0 0 10px;
  font-family: var(--sg-font-mono);
  font-size: 12px;
  color: var(--sg-gold);
}

.page-faq .faq-case__body p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(245, 240, 229, 0.82);
}

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

/* ---------- 安装问答 ---------- */
.page-faq .faq-install__list {
  display: grid;
  gap: 12px;
}

.page-faq .faq-qa {
  padding: 16px 18px;
  border: 1px solid var(--sg-line-soft);
  border-radius: var(--sg-radius-sm);
  background: linear-gradient(150deg, rgba(18, 20, 29, 0.9), rgba(7, 8, 13, 0.9));
}

.page-faq .faq-qa[open] {
  border-color: var(--sg-line);
}

.page-faq .faq-qa summary {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.65;
}

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

.page-faq .faq-qa summary::after {
  content: "▾";
  flex: 0 0 auto;
  font-size: 14px;
  color: var(--sg-gold);
  transition: transform 0.2s ease;
}

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

.page-faq .faq-qa__a {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--sg-line-soft);
}

.page-faq .faq-qa__a p {
  margin: 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--sg-mist);
}

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

.page-faq .faq-qa__a a:hover { color: var(--sg-gold); }

/* ---------- 大屏权益 ---------- */
.page-faq .faq-perks {
  background: linear-gradient(180deg, rgba(20, 49, 58, 0.7), rgba(7, 8, 13, 0) 78%);
}

.page-faq .faq-perks__col {
  max-width: 780px;
}

.page-faq .faq-perk-rows {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(20px, 3vw, 28px);
}

.page-faq .faq-perk {
  display: grid;
  gap: 6px;
  padding: 14px 16px;
  border-radius: var(--sg-radius-sm);
  border: 1px solid var(--sg-line-soft);
  background: rgba(7, 8, 13, 0.6);
}

.page-faq .faq-perk--gold { border-left: 3px solid var(--sg-gold); }
.page-faq .faq-perk--cyan { border-left: 3px solid var(--sg-cyan); }
.page-faq .faq-perk--rose { border-left: 3px solid var(--sg-rose); }

.page-faq .faq-perk__key {
  margin: 0;
  font-family: var(--sg-font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--sg-cream);
}

.page-faq .faq-perk__val {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--sg-mist);
}

.page-faq .faq-perks__text {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(245, 240, 229, 0.84);
}

.page-faq .faq-figure {
  margin: 0 0 18px;
  border: 2px solid var(--sg-line);
  border-radius: var(--sg-radius);
  box-shadow: var(--sg-shadow-hard);
  overflow: hidden;
  background: var(--sg-graphite);
}

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

.page-faq .faq-figure__cap {
  padding: 10px 14px;
  font-family: var(--sg-font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--sg-mist);
  border-top: 1px solid var(--sg-line-soft);
}

/* ---------- 提交反馈 ---------- */
.page-faq .faq-submit__grid {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
}

.page-faq .faq-checklist {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: faq-step;
  display: grid;
  gap: 12px;
}

.page-faq .faq-checklist li {
  counter-increment: faq-step;
  position: relative;
  padding: 14px 16px 14px 56px;
  border: 1px solid var(--sg-line-soft);
  border-radius: var(--sg-radius-sm);
  background: rgba(18, 20, 29, 0.78);
}

.page-faq .faq-checklist li::before {
  content: counter(faq-step, decimal-leading-zero);
  position: absolute;
  left: 16px;
  top: 14px;
  font-family: var(--sg-font-mono);
  font-size: 15px;
  color: var(--sg-gold);
}

.page-faq .faq-checklist strong {
  display: block;
  margin-bottom: 3px;
  font-size: 15px;
  font-weight: 600;
  color: var(--sg-cream);
}

.page-faq .faq-checklist span {
  display: block;
  font-size: 13px;
  line-height: 1.75;
  color: var(--sg-mist);
}

.page-faq .faq-template-box {
  padding: 18px;
  border: 2px solid var(--sg-line);
  border-radius: var(--sg-radius);
  background: linear-gradient(160deg, rgba(18, 20, 29, 0.96), rgba(7, 8, 13, 0.96));
  box-shadow: var(--sg-shadow-hard);
}

.page-faq .faq-template__label {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--sg-cyan);
}

.page-faq .faq-template {
  margin: 0 0 16px;
  padding: 14px 16px;
  font-family: var(--sg-font-mono);
  font-size: 13px;
  line-height: 2;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--sg-cream);
  background: rgba(7, 8, 13, 0.8);
  border: 1px dashed var(--sg-line);
  border-radius: var(--sg-radius-sm);
}

.page-faq .faq-template__hint {
  margin: 14px 0 0;
  font-size: 12px;
  line-height: 1.75;
  color: var(--sg-mist);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-cases,
  .page-faq .faq-install__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 960px) {
  .page-faq .faq-head__layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-faq .faq-rail__panel {
    flex-basis: 380px;
  }

  .page-faq .faq-submit__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-locate__tags a,
  .page-faq .faq-qa summary::after {
    transition: none;
  }
}