/* =====================================================
   知识中心 · 问答控制台
   ===================================================== */

.page-faq {
  background: var(--deep);
  color: var(--paper);
}

.page-faq > .shell:first-child {
  padding-block-start: clamp(84px, 11vw, 118px);
}

.page-faq .crumbs {
  margin-bottom: clamp(16px, 2.6vw, 26px);
}

/* ---------- 页首 ---------- */

.page-faq .faq-head {
  position: relative;
  overflow: hidden;
  padding: 0 0 clamp(34px, 5vw, 58px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 84% 0%, rgba(47, 211, 176, 0.16), transparent 62%),
    radial-gradient(90% 80% at 4% 100%, rgba(200, 255, 61, 0.12), transparent 60%);
}

.page-faq .faq-head::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(244, 241, 232, 0.055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(244, 241, 232, 0.055) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, 0.3) 62%, transparent 100%);
  mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, 0.3) 62%, transparent 100%);
}

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

.page-faq .faq-head__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 14px;
  padding-left: 14px;
  position: relative;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--teal);
}

.page-faq .faq-head__eyebrow::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 6px;
  background: var(--lime);
  transform: translateY(-50%);
}

.page-faq .faq-head__title {
  margin: 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 6.4vw, 60px);
  line-height: 1.06;
  letter-spacing: -0.012em;
  color: var(--paper);
}

.page-faq .faq-head__lede {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(244, 241, 232, 0.78);
}

.page-faq .faq-head__facts {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: clamp(16px, 2vw, 20px) 0 0;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 12px 32px;
}

.page-faq .faq-head__facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-faq .faq-head__num {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(24px, 3.6vw, 34px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--lime);
}

.page-faq .faq-head__lab {
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--steel);
}

.page-faq .faq-head__media {
  margin-top: clamp(24px, 4vw, 42px);
}

.page-faq .faq-head__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--line-strong);
  background: var(--indigo);
}

/* ---------- 控制台双栏 ---------- */

.page-faq .faq-desk {
  padding: clamp(32px, 5vw, 60px) 0 clamp(44px, 6vw, 78px);
}

.page-faq .faq-desk__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 3vw, 28px);
  align-items: start;
}

/* 左侧分类 */

.page-faq .faq-rail {
  border: 1px solid var(--line);
  border-left: 2px solid var(--lime);
  background: rgba(17, 21, 19, 0.9);
  padding: 16px 14px 14px;
}

.page-faq .faq-rail__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--steel);
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: nowrap;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-faq .faq-rail__item {
  flex: 0 0 auto;
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  color: var(--paper);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.2;
  white-space: nowrap;
  transition: background var(--dur) ease, border-color var(--dur) ease, color var(--dur) ease;
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  background: rgba(200, 255, 61, 0.1);
  border-color: rgba(200, 255, 61, 0.55);
  color: var(--lime);
  outline: none;
}

.page-faq .faq-rail__dot {
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  background: var(--lime);
}

.page-faq .faq-rail__count {
  margin-left: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--steel);
}

.page-faq .faq-rail__note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--steel);
}

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

/* ---------- 右侧问答组 ---------- */

.page-faq .faq-panels {
  display: grid;
  gap: clamp(16px, 2.4vw, 26px);
  min-width: 0;
}

.page-faq .faq-group {
  --acc: var(--steel);
  min-width: 0;
  padding: clamp(18px, 3vw, 30px);
  border: 1px solid var(--line);
  border-top: 3px solid var(--acc);
  background: linear-gradient(180deg, rgba(17, 21, 19, 0.95) 0%, rgba(10, 13, 11, 0.92) 100%);
  scroll-margin-top: 96px;
}

.page-faq .faq-group--lime { --acc: var(--lime); }
.page-faq .faq-group--teal { --acc: var(--teal); }
.page-faq .faq-group--orange { --acc: var(--orange); }

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 6px 12px;
  padding-bottom: 14px;
  margin-bottom: 4px;
  border-bottom: 1px solid var(--line);
}

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

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-editorial);
  font-weight: 600;
  font-size: clamp(19px, 2.6vw, 27px);
  line-height: 1.25;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-faq .faq-group__meta {
  grid-column: 1 / -1;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--steel);
}

/* 组内插图 */

.page-faq .faq-figure {
  margin: 18px 0 6px;
  max-width: 100%;
  border: 1px solid var(--line);
  background: var(--indigo);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-faq .faq-figure__cap {
  padding: 10px 12px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.65;
  letter-spacing: 0.02em;
  color: var(--steel);
}

/* 问题条目 */

.page-faq .faq-q {
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-q:last-child {
  border-bottom: 0;
}

.page-faq .faq-q__summary {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 34px 16px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-q__summary::marker {
  content: "";
}

.page-faq .faq-q__idx {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--steel);
}

.page-faq .faq-q__text {
  font-size: clamp(15px, 1.6vw, 17px);
  font-weight: 600;
  line-height: 1.55;
  color: var(--paper);
  transition: color var(--dur) ease;
}

.page-faq .faq-q__summary:hover .faq-q__text,
.page-faq .faq-q[open] .faq-q__text {
  color: var(--lime);
}

.page-faq .faq-q__sign {
  position: absolute;
  right: 0;
  top: 22px;
  width: 14px;
  height: 14px;
}

.page-faq .faq-q__sign::before,
.page-faq .faq-q__sign::after {
  content: "";
  position: absolute;
  background: var(--acc);
  transition: transform var(--dur) ease, opacity var(--dur) ease;
}

.page-faq .faq-q__sign::before {
  left: 0;
  right: 0;
  top: 6px;
  height: 2px;
}

.page-faq .faq-q__sign::after {
  top: 0;
  bottom: 0;
  left: 6px;
  width: 2px;
}

.page-faq .faq-q[open] .faq-q__sign::after {
  transform: scaleY(0);
}

.page-faq .faq-q .faq-q__body {
  margin: 2px 0 18px;
  padding: 16px 18px;
  border-left: 3px solid var(--acc);
  background: var(--sand);
  color: var(--char);
  font-size: 15px;
  line-height: 1.78;
}

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

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

.page-faq .faq-q .faq-q__body a {
  color: #10553F;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-q .faq-q__body a:hover {
  color: #0A2E22;
}

/* ---------- 底部行动面板 ---------- */

.page-faq .faq-cta {
  padding: clamp(32px, 5vw, 58px) 0 clamp(40px, 6vw, 72px);
  border-top: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(36, 21, 46, 0.95) 0%, rgba(58, 21, 32, 0.88) 100%);
}

.page-faq .faq-cta__inner {
  display: grid;
  gap: 24px;
  align-items: start;
}

.page-faq .faq-cta__title {
  margin: 10px 0 0;
  max-width: 20ch;
  font-family: var(--font-editorial);
  font-weight: 600;
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1.3;
  color: var(--paper);
}

.page-faq .faq-cta__text {
  margin: 14px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 241, 232, 0.76);
}

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

/* ---------- 断点 ---------- */

@media (min-width: 620px) {
  .page-faq .faq-figure {
    max-width: 420px;
  }

  .page-faq .faq-rail__list {
    flex-wrap: wrap;
    overflow-x: visible;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-desk__grid {
    grid-template-columns: minmax(200px, 254px) minmax(0, 1fr);
    gap: clamp(28px, 3.4vw, 52px);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 92px;
    padding: 20px 18px 16px;
  }

  .page-faq .faq-rail__list {
    display: block;
    overflow: visible;
  }

  .page-faq .faq-rail__item + .faq-rail__item {
    margin-top: 4px;
  }

  .page-faq .faq-rail__link {
    border-color: transparent;
  }

  .page-faq .faq-rail__count {
    margin-left: auto;
  }

  .page-faq .faq-q__summary {
    padding: 18px 40px 18px 0;
  }

  .page-faq .faq-q__sign {
    top: 24px;
  }

  .page-faq .faq-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 44px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-rail__link,
  .page-faq .faq-q__text,
  .page-faq .faq-q__sign::before,
  .page-faq .faq-q__sign::after {
    transition: none;
  }
}