.page-faq {
  --faq-pad: clamp(16px, 2.2vw, 24px);
  --faq-mark: 30px;
  display: block;
  background: var(--ink);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(92px, 13vw, 152px) 0 clamp(44px, 6vw, 74px);
  background: linear-gradient(180deg, var(--ink-2) 0%, var(--ink) 100%);
  border-bottom: 1px solid var(--edge);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -34%;
  right: -14%;
  width: min(640px, 82vw);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: radial-gradient(closest-side, rgba(125, 240, 74, .16), rgba(125, 240, 74, 0) 72%);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  right: 10%;
  bottom: -12%;
  width: 44%;
  height: 58%;
  background: linear-gradient(140deg, rgba(47, 182, 255, .14), rgba(47, 182, 255, 0) 68%);
  clip-path: polygon(38% 0, 100% 12%, 74% 100%, 0 76%);
  pointer-events: none;
}

.page-faq .faq-hero .eyebrow {
  margin: 0 0 4px;
}

.page-faq .faq-hero h1 {
  margin: 14px 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(31px, 5.2vw, 62px);
  line-height: 1.09;
  letter-spacing: -0.02em;
  max-width: 19ch;
}

.page-faq .faq-hero .lede {
  max-width: 64ch;
  margin: 0;
  color: var(--muted);
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.8;
}

/* ---------- 两栏骨架 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 5vw, 56px);
  padding-top: clamp(48px, 7vw, 84px);
  padding-bottom: clamp(72px, 10vw, 124px);
}

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

.page-faq .faq-rail-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--muted-2);
  text-transform: uppercase;
}

.page-faq .faq-toc {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-faq .faq-toc a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  font-size: 14px;
  line-height: 1.4;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .faq-toc .toc-idx {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted-2);
  transition: color var(--dur) var(--ease);
}

.page-faq .faq-toc a:hover,
.page-faq .faq-toc a:focus-visible {
  color: var(--paper);
  border-color: var(--lime);
  background: var(--lime-soft);
  outline: none;
}

.page-faq .faq-toc a:hover .toc-idx,
.page-faq .faq-toc a:focus-visible .toc-idx {
  color: var(--lime);
}

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

/* ---------- 分组 ---------- */
.page-faq .faq-section {
  scroll-margin-top: calc(var(--header-h) + 24px);
  padding-top: clamp(36px, 5.5vw, 64px);
}

.page-faq .faq-section:first-child {
  padding-top: 0;
}

.page-faq .faq-section + .faq-section {
  border-top: 1px solid var(--edge);
  margin-top: clamp(36px, 5.5vw, 64px);
}

.page-faq .faq-section .section-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 10px;
}

.page-faq .faq-section .section-idx {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--lime);
}

.page-faq .faq-section h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3vw, 34px);
  line-height: 1.22;
  letter-spacing: -0.01em;
}

.page-faq .faq-section .section-lede {
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 64ch;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

.page-faq .faq-section a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 182, 255, .4);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-section a:hover,
.page-faq .faq-section a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

/* ---------- 三步自查 ---------- */
.page-faq .check-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
}

.page-faq .check-main {
  min-width: 0;
}

.page-faq .check-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-faq .check-step {
  position: relative;
  overflow: hidden;
  padding: 20px 18px 22px;
  background: linear-gradient(165deg, var(--panel) 0%, rgba(22, 32, 47, .55) 100%);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-faq .check-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--lime), rgba(125, 240, 74, 0));
}

.page-faq .check-step:hover {
  border-color: rgba(125, 240, 74, .45);
  transform: translateY(-3px);
}

.page-faq .check-num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--lime);
}

.page-faq .check-step h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}

.page-faq .check-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

.page-faq .check-arrow {
  width: 22px;
  height: 22px;
  justify-self: center;
  align-self: center;
  color: var(--blue);
  transform: rotate(90deg);
}

.page-faq .check-note {
  margin: 18px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--clay);
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 图片 ---------- */
.page-faq .faq-figure {
  margin: 0;
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  background: var(--panel);
  overflow: hidden;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-faq .faq-figure-cap {
  padding: 12px 16px;
  border-top: 1px solid var(--edge);
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted-2);
}

/* ---------- 问答手风琴 ---------- */
.page-faq .qa-list {
  display: grid;
  gap: 10px;
}

.page-faq details.qa {
  background: var(--panel);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  transition: border-color var(--dur) var(--ease);
}

.page-faq details.qa:hover {
  border-color: rgba(47, 182, 255, .45);
}

.page-faq details.qa[open] {
  border-color: rgba(125, 240, 74, .5);
}

.page-faq details.qa > summary {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 17px var(--faq-pad);
  cursor: pointer;
  list-style: none;
  font-size: clamp(15px, 1.6vw, 17px);
  font-weight: 600;
  line-height: 1.55;
  color: var(--paper);
  transition: color var(--dur) var(--ease);
}

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

.page-faq details.qa > summary::before {
  content: "+";
  flex: 0 0 auto;
  width: 16px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1.4;
  color: var(--lime);
}

.page-faq details.qa[open] > summary::before {
  content: "\2013";
}

.page-faq details.qa > summary:hover {
  color: var(--lime);
}

.page-faq details.qa > summary:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: -2px;
}

.page-faq .qa-body {
  padding: 2px var(--faq-pad) 20px calc(var(--faq-pad) + var(--faq-mark));
  border-left: 2px solid transparent;
}

.page-faq details.qa[open] .qa-body {
  border-left-color: rgba(125, 240, 74, .45);
}

.page-faq .qa-body p {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

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

.page-faq .qa-body ol {
  margin: 0 0 12px;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .qa-body li + li {
  margin-top: 6px;
}

/* ---------- 收藏订阅 ---------- */
.page-faq .collect-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-faq .collect-steps {
  counter-reset: cstep;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-faq .collect-steps li {
  position: relative;
  padding-left: 46px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .collect-steps li::before {
  counter-increment: cstep;
  content: counter(cstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 1px;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border: 1px solid var(--edge);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--lime);
  background: var(--ink-2);
}

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

/* ---------- 反馈与响应 ---------- */
.page-faq .contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-faq .contact-card {
  padding: 22px 20px 24px;
  background: var(--panel);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-faq .contact-card:hover {
  border-color: rgba(125, 240, 74, .45);
  transform: translateY(-3px);
}

.page-faq .contact-label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--muted-2);
  text-transform: uppercase;
}

.page-faq .contact-value {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: clamp(15px, 1.7vw, 18px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
  word-break: break-word;
}

.page-faq .contact-note {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--muted);
}

.page-faq .support-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-top: clamp(24px, 3.5vw, 36px);
  padding: clamp(20px, 2.6vw, 28px) clamp(20px, 2.6vw, 30px);
  background: linear-gradient(120deg, rgba(255, 138, 61, .16), rgba(255, 138, 61, 0) 62%), var(--ink-2);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
}

.page-faq .support-cta p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--paper);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-faq .check-flow {
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: stretch;
    gap: 8px;
  }

  .page-faq .check-arrow {
    transform: none;
  }

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

@media (min-width: 900px) {
  .page-faq .check-grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .collect-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr);
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--rail) minmax(0, 1fr);
    gap: clamp(40px, 4vw, 72px);
  }

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

  .page-faq .faq-toc {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
    border-left: 1px solid var(--edge);
  }

  .page-faq .faq-toc a {
    display: flex;
    width: 100%;
    margin-left: -1px;
    padding: 10px 12px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    font-size: 13.5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .check-step,
  .page-faq .contact-card,
  .page-faq .faq-toc a,
  .page-faq details.qa {
    transition: none;
  }

  .page-faq .check-step:hover,
  .page-faq .contact-card:hover {
    transform: none;
  }
}
</main>