.page-faq {
  --faq-hero-min: 320px;
}

/* ---------- 章节导航轨 ---------- */
.page-faq .rail {
  display: none;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(120% 90% at 12% 0%, rgba(53, 242, 192, 0.10), transparent 58%),
    linear-gradient(168deg, var(--ink) 0%, var(--ink-2) 62%, var(--ink-3) 100%);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 -1px 0;
  height: 6px;
  background: linear-gradient(90deg, var(--cyan) 0 22%, transparent 22% 100%);
  opacity: 0.5;
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: 28px;
  padding-top: 40px;
  padding-bottom: 40px;
}

.page-faq .faq-hero__lead {
  max-width: 34rem;
}

.page-faq .faq-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(2rem, 7.2vw, 4.2rem);
  line-height: 1.08;
  font-weight: 300;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-faq .faq-hero__lede {
  margin: 18px 0 0;
  max-width: 34rem;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--mist);
}

.page-faq .faq-hero__note {
  margin: 16px 0 0;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--mist-2);
}

.page-faq .faq-hero__media {
  position: relative;
}

.page-faq .faq-hero__media::before {
  content: "";
  position: absolute;
  inset: -10px -10px auto auto;
  width: 56px;
  height: 3px;
  background: var(--cyan);
  z-index: 2;
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(4% 0, 100% 0, 96% 100%, 0 100%);
  filter: saturate(0.7) contrast(1.05);
}

/* ---------- 问题地图 ---------- */
.page-faq .faq-map {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-map__cell {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px 18px;
  background: var(--ink-2);
  text-decoration: none;
  transition: transform var(--t-fast), background var(--t-mid), box-shadow var(--t-mid);
}

.page-faq .faq-map__cell::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--cyan);
  opacity: 0.6;
  transition: opacity var(--t-mid);
}

.page-faq .faq-map__cell--b::before { background: var(--cyan-2); }
.page-faq .faq-map__cell--c::before { background: var(--brass); }
.page-faq .faq-map__cell--d::before { background: var(--indigo); }
.page-faq .faq-map__cell--e::before { background: var(--clay); }
.page-faq .faq-map__cell--f::before { background: var(--wine); }

.page-faq .faq-map__cell:hover,
.page-faq .faq-map__cell:focus-visible {
  transform: translateY(-2px);
  background: var(--ink);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.35);
}

.page-faq .faq-map__cell:hover::before,
.page-faq .faq-map__cell:focus-visible::before {
  opacity: 1;
}

.page-faq .faq-map__no {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-faq .faq-map__name {
  font-size: 0.92rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--paper);
}

.page-faq .faq-map__hint {
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--mist-2);
}

/* ---------- 区块通用 ---------- */
.page-faq .faq-block {
  padding: 44px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-block--alt {
  background: linear-gradient(180deg, rgba(16, 42, 34, 0.55) 0%, rgba(11, 31, 26, 0) 100%);
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-block--end {
  border-bottom: 0;
  padding-bottom: 56px;
}

.page-faq .section__head {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 22px;
}

.page-faq .section-no {
  flex: none;
  font-family: var(--font-mono);
  font-size: 1.6rem;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-faq .section__title {
  margin: 0;
  font-size: clamp(1.35rem, 4.4vw, 2.1rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-block__sub {
  margin: 8px 0 0;
  font-size: 0.86rem;
  line-height: 1.6;
  color: var(--mist-2);
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-list {
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-q {
  border-bottom: 1px solid var(--line-soft);
  border-left: 2px solid transparent;
  padding-left: 14px;
  transition: border-color var(--t-mid), background var(--t-mid);
}

.page-faq .faq-q:hover {
  background: rgba(16, 42, 34, 0.5);
}

.page-faq .faq-q[open] {
  border-left-color: var(--cyan);
  background: rgba(16, 42, 34, 0.42);
}

.page-faq .faq-q summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 4px 16px 0;
  cursor: pointer;
  font-size: 0.98rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper);
  list-style: none;
}

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

.page-faq .faq-q summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--mist-2);
  transition: color var(--t-fast);
}

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

.page-faq .faq-q summary:hover::after {
  color: var(--cyan);
}

.page-faq .faq-a {
  padding: 0 4px 20px 0;
  max-width: 40rem;
}

.page-faq .faq-a p {
  margin: 0 0 12px;
  font-size: 0.93rem;
  line-height: 1.78;
  color: var(--mist);
}

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

.page-faq .faq-q[open] .faq-a {
  animation: faq-reveal var(--t-mid) both;
}

@keyframes faq-reveal {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: none; }
}

.page-faq .faq-a a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
  transition: border-color var(--t-fast), color var(--t-fast);
}

.page-faq .faq-a a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 步骤编号 ---------- */
.page-faq .steps {
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-faq .steps li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .steps__no {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
  border-bottom: 1px solid var(--line-cyan);
}

/* ---------- 术语卡 ---------- */
.page-faq .term-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-bottom: 26px;
}

.page-faq .term-card {
  border: 1px solid rgba(244, 247, 245, 0.32);
  background: rgba(244, 247, 245, 0.03);
  padding: 14px 16px 16px;
  transition: border-color var(--t-mid), background var(--t-mid);
}

.page-faq .term-card:hover {
  border-color: var(--cyan);
  background: rgba(53, 242, 192, 0.05);
}

.page-faq .term-card__word {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  color: var(--paper);
}

.page-faq .term-card__def {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.68;
  color: var(--mist-2);
}

/* ---------- 检索示意图 ---------- */
.page-faq .faq-figure {
  margin: 0 0 26px;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  filter: saturate(0.72);
}

.page-faq .faq-figure .media__cap {
  margin-top: 10px;
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: var(--mist-2);
}

/* ---------- 末段联络 ---------- */
.page-faq .faq-cta {
  display: grid;
  gap: 22px;
  padding: 26px 20px 28px;
  border: 1px solid var(--line-cyan);
  background: linear-gradient(140deg, rgba(53, 242, 192, 0.12), rgba(16, 42, 34, 0.7));
}

.page-faq .faq-cta__line {
  margin: 0 0 16px;
  max-width: 34rem;
  font-size: 1rem;
  line-height: 1.72;
  color: var(--paper);
}

.page-faq .faq-cta .contact-line {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 8px;
  font-size: 0.88rem;
}

.page-faq .faq-cta .contact-line__key {
  flex: none;
  min-width: 4.6rem;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--brass);
  align-self: center;
}

.page-faq .faq-cta .contact-line__val {
  font-family: var(--font-mono);
  color: var(--paper);
  word-break: break-all;
}

.page-faq .faq-cta__note {
  margin: 10px 0 0;
  font-size: 0.78rem;
  color: var(--mist-2);
}

.page-faq .faq-cta__action {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.page-faq .faq-cta__action .btn {
  min-width: 8.5rem;
  text-align: center;
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-map {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-faq .faq-cta {
    padding: 30px 28px 32px;
  }

  .page-faq .faq-block {
    padding: 56px 0;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: 7fr 5fr;
    align-items: end;
    gap: 48px;
    padding-top: 64px;
    padding-bottom: 56px;
  }

  .page-faq .faq-map {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-faq .faq-map__cell {
    padding: 20px 16px 22px;
  }

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

  .page-faq .section__head {
    gap: 24px;
    margin-bottom: 28px;
  }

  .page-faq .section-no {
    font-size: 2.6rem;
  }

  .page-faq .faq-q summary {
    font-size: 1.05rem;
    padding: 18px 6px 18px 0;
  }

  .page-faq .faq-q {
    padding-left: 18px;
  }

  .page-faq .faq-cta {
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 32px;
    padding: 36px 32px;
  }

  .page-faq .faq-cta__action {
    flex-direction: column;
    align-items: stretch;
  }

  .page-faq .faq-cta__action .btn {
    width: 100%;
  }
}

@media (min-width: 1440px) {
  .page-faq .rail {
    display: block;
    position: fixed;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 5;
  }

  .page-faq .rail__link {
    display: block;
    padding: 6px 0;
    font-size: 0.68rem;
    letter-spacing: 0.18em;
    color: var(--mist-2);
    text-decoration: none;
    transition: color var(--t-fast);
  }

  .page-faq .rail__link.is-active,
  .page-faq .rail__link:hover {
    color: var(--cyan);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-map__cell,
  .page-faq .term-card,
  .page-faq .faq-q {
    transition: none;
  }

  .page-faq .faq-q[open] .faq-a {
    animation: none;
  }
}