.page-faq {
  --faq-paper-ink: #0B1220;
  --faq-answer: #C3CDDB;
  background: var(--ink-900);
  color: var(--paper);
  overflow-x: hidden;
}

/* ===== 首屏 ===== */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  padding: clamp(22px, 4vw, 40px) 0 clamp(38px, 6vw, 76px);
  background:
    linear-gradient(138deg, rgba(255, 107, 44, 0.16) 0%, rgba(255, 107, 44, 0) 44%),
    linear-gradient(312deg, rgba(56, 242, 208, 0.12) 0%, rgba(56, 242, 208, 0) 48%),
    var(--ink-900);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: 0.4;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 88%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 88%);
}

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

.page-faq .breadcrumb {
  margin-bottom: clamp(22px, 4vw, 44px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-faq .faq-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 56px);
  align-items: start;
}

.page-faq .faq-hero h1 {
  margin: 10px 0 16px;
  font-size: clamp(30px, 6.2vw, 62px);
  line-height: 1.06;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-faq .faq-lead {
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 60ch;
  font-size: clamp(15px, 2vw, 17px);
  line-height: 1.75;
  color: var(--metal);
}

.page-faq .hero-steps {
  list-style: none;
  margin: 0 0 clamp(22px, 3.4vw, 32px);
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-faq .hero-steps li {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
  color: var(--paper);
}

.page-faq .hero-num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--signal);
}

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

.page-faq .faq-hero-side {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 84px;
  gap: 16px;
  align-items: end;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.page-faq .side-panel {
  border: 1px solid var(--line);
  background: rgba(14, 21, 36, 0.82);
  padding: 16px 16px 6px;
}

.page-faq .side-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--metal-dim);
}

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

.page-faq .side-links li + li {
  border-top: 1px solid var(--line);
}

.page-faq .side-links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 0;
  font-size: 14px;
  color: var(--paper);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.page-faq .side-links a span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-faq .side-links a:hover,
.page-faq .side-links a:focus-visible {
  color: var(--cyan-soft);
}

.page-faq .faq-scale-svg {
  display: block;
  width: 100%;
  height: auto;
  max-height: 220px;
}

.page-faq .sc-axis {
  stroke: var(--line);
  stroke-width: 1;
}

.page-faq .sc-ticks {
  stroke: var(--metal-dim);
  stroke-width: 1;
  stroke-dasharray: 2 8;
}

.page-faq .sc-h {
  stroke: var(--cyan);
  stroke-width: 1;
  opacity: 0.42;
}

.page-faq .sc-h--live {
  stroke: var(--signal);
  opacity: 0.9;
}

.page-faq .sc-dot {
  fill: var(--signal);
}

.page-faq .sc-dot--dim {
  fill: var(--cyan);
  opacity: 0.6;
}

/* ===== 主体两栏 ===== */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 44px);
  padding: clamp(32px, 5vw, 68px) 0 clamp(48px, 7vw, 92px);
}

.page-faq .faq-rail {
  min-width: 0;
  border-bottom: 1px solid var(--line);
  padding-bottom: 14px;
}

.page-faq .rail-title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--metal-dim);
}

.page-faq .faq-rail ol {
  list-style: none;
  margin: 10px 0 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-faq .faq-rail ol::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-rail a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 13px;
  white-space: nowrap;
  color: var(--metal);
  text-decoration: none;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-faq .faq-rail a:hover,
.page-faq .faq-rail a:focus-visible {
  color: var(--cyan-soft);
  border-color: var(--cyan);
}

.page-faq .faq-rail a[aria-current] {
  color: var(--cyan-soft);
  border-color: var(--cyan);
  background: rgba(56, 242, 208, 0.08);
}

.page-faq .rail-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--signal);
}

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

/* ===== 章节 ===== */
.page-faq .faq-block {
  margin-bottom: clamp(34px, 5vw, 64px);
  padding-top: clamp(24px, 3.4vw, 40px);
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-h) + 20px);
}

.page-faq .faq-block:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.page-faq .faq-block h2 {
  margin: 6px 0 12px;
  font-size: clamp(21px, 3vw, 32px);
  line-height: 1.24;
  font-weight: 600;
  color: var(--paper);
}

.page-faq .block-lead {
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--metal);
}

/* ===== 图版 ===== */
.page-faq .faq-figure {
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  padding: 8px;
  border: 1px solid var(--line);
  background: var(--ink-800);
}

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

.page-faq .faq-figure figcaption {
  padding: 10px 2px 2px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  line-height: 1.6;
  color: var(--metal-dim);
}

/* ===== 折叠问答 ===== */
.page-faq .faq-list {
  display: grid;
  gap: 10px;
}

.page-faq .faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(14, 21, 36, 0.72);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-faq .faq-item:hover {
  border-color: rgba(56, 242, 208, 0.45);
}

.page-faq .faq-item[open] {
  border-color: rgba(56, 242, 208, 0.55);
  background: rgba(19, 29, 49, 0.9);
}

.page-faq .faq-item summary {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr) 16px;
  gap: 12px;
  align-items: start;
  padding: 16px;
  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: -2px;
}

.page-faq .faq-num {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--signal);
  padding-top: 3px;
}

.page-faq .faq-q {
  font-size: 15.5px;
  line-height: 1.55;
  font-weight: 500;
  color: var(--paper);
}

.page-faq .faq-mark {
  position: relative;
  width: 14px;
  height: 14px;
  margin-top: 5px;
}

.page-faq .faq-mark::before,
.page-faq .faq-mark::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform 0.22s var(--ease), opacity 0.22s var(--ease);
}

.page-faq .faq-mark::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.page-faq .faq-mark::after {
  left: 6px;
  top: 0;
  width: 2px;
  height: 14px;
}

.page-faq .faq-item[open] .faq-mark::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-faq .faq-a {
  padding: 0 16px 18px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--faq-answer);
}

.page-faq .faq-a p {
  margin: 0 0 10px;
}

.page-faq .faq-a p:last-child {
  margin-bottom: 0;
  color: var(--metal);
}

/* ===== 联系档案卡 ===== */
.page-faq .faq-contact {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
  color: var(--faq-paper-ink);
  padding: clamp(20px, 3.6vw, 40px);
  box-shadow: -6px 6px 0 rgba(34, 48, 71, 0.6);
}

.page-faq .contact-head {
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(11, 18, 32, 0.18);
}

.page-faq .contact-kicker {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(11, 18, 32, 0.62);
}

.page-faq .contact-note {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--faq-paper-ink);
}

.page-faq .faq-contact-list {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
}

.page-faq .faq-contact-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 6px 12px;
  align-items: center;
  padding: 14px 0;
  border-bottom: 1px dashed rgba(11, 18, 32, 0.22);
}

.page-faq .c-label {
  grid-column: 1 / -1;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: rgba(11, 18, 32, 0.58);
}

.page-faq .c-value {
  font-size: 15.5px;
  line-height: 1.5;
  word-break: break-word;
  color: var(--faq-paper-ink);
}

.page-faq .faq-copy-btn {
  padding: 7px 13px;
  border: 1px solid rgba(11, 18, 32, 0.35);
  border-radius: var(--radius);
  background: transparent;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--faq-paper-ink);
  cursor: pointer;
  transition: background 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-faq .faq-copy-btn:hover {
  background: var(--faq-paper-ink);
  color: var(--card);
  border-color: var(--faq-paper-ink);
}

.page-faq .faq-copy-btn:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

.page-faq .faq-contact-foot {
  margin: 16px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(11, 18, 32, 0.72);
}

/* ===== 响应式 ===== */
@media (min-width: 700px) {
  .page-faq .faq-a {
    padding: 0 44px 20px 60px;
  }

  .page-faq .faq-item summary {
    padding: 18px 20px;
  }

  .page-faq .faq-hero-side {
    grid-template-columns: minmax(0, 1fr) 120px;
  }

  .page-faq .faq-contact-list li {
    grid-template-columns: 96px minmax(0, 1fr) auto;
    gap: 12px;
  }

  .page-faq .c-label {
    grid-column: auto;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero-grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.8fr);
    gap: clamp(30px, 4vw, 60px);
  }

  .page-faq .faq-hero-side {
    grid-template-columns: minmax(0, 1fr);
    border-top: 0;
    padding-top: 0;
  }

  .page-faq .faq-scale-svg {
    max-height: 260px;
  }

  .page-faq .faq-figure--narrow {
    max-width: 78%;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-body {
    grid-template-columns: 214px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    align-self: start;
    border-bottom: 0;
    padding-bottom: 0;
  }

  .page-faq .faq-rail ol {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-rail li + li {
    margin-top: 2px;
  }

  .page-faq .faq-rail a {
    width: 100%;
    justify-content: flex-start;
    border: 0;
    border-left: 2px solid var(--line);
    border-radius: 0;
    padding: 9px 0 9px 14px;
    white-space: normal;
  }

  .page-faq .faq-rail a[aria-current] {
    background: transparent;
    border-left-color: var(--cyan);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-mark::before,
  .page-faq .faq-mark::after,
  .page-faq .faq-item,
  .page-faq .faq-copy-btn,
  .page-faq .faq-rail a,
  .page-faq .side-links a {
    transition: none;
  }
}