/* ================= 指南中心 /knowledge/ ================= */

.page-faq {
  --faq-rail-w: 240px;
  --faq-answer: rgba(234, 243, 240, 0.82);
  --faq-panel: rgba(16, 46, 38, 0.66);
  position: relative;
  display: block;
  background: var(--ink-green-base);
  color: var(--paper-light);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */

.page-faq__hero {
  position: relative;
  isolation: isolate;
  padding: var(--space-4) 0 var(--space-5);
}

.page-faq__hero::before {
  content: "";
  position: absolute;
  inset: 0 0 38% 0;
  z-index: -2;
  background:
    radial-gradient(58% 84% at 16% 18%, rgba(43, 240, 200, 0.20), transparent 70%),
    radial-gradient(52% 74% at 88% 68%, rgba(255, 106, 43, 0.16), transparent 72%);
  clip-path: polygon(0 0, 100% 0, 100% 62%, 0 100%);
  pointer-events: none;
}

.page-faq__hero::after {
  content: "";
  position: absolute;
  inset: 0 0 32% 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(143, 169, 161, 0.09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(143, 169, 161, 0.09) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 84%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 84%);
  pointer-events: none;
}

.page-faq__hero-grid {
  display: grid;
  gap: var(--space-4);
  align-items: center;
}

.page-faq .crumbs {
  margin-bottom: var(--space-3);
}

.page-faq__title {
  margin: var(--space-3) 0;
  font-family: var(--font-heading);
  font-size: clamp(2rem, 7vw, 3.4rem);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: 0.02em;
  color: var(--paper-light);
}

.page-faq__title em {
  font-style: normal;
  color: var(--cyan-signal);
}

.page-faq__lede {
  margin: 0 0 var(--space-4);
  max-width: 54ch;
  color: var(--mist-gray);
  font-size: 1.0625rem;
  line-height: 1.78;
}

.page-faq__hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.page-faq__figure {
  margin: 0;
}

.page-faq__figure .media__frame {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius-l);
  background: var(--deep-green-layer);
}

.page-faq__figure .media__frame::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 48%;
  background: linear-gradient(180deg, transparent, rgba(11, 31, 26, 0.88));
}

.page-faq__figure .media__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-faq__figure .media__caption {
  display: block;
  margin-top: var(--space-2);
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--mist-gray);
}

/* ---------- 主体两栏 ---------- */

.page-faq__body {
  display: grid;
  gap: var(--space-4);
  padding-bottom: var(--space-6);
}

.page-faq__rail {
  display: grid;
  gap: var(--space-3);
  min-width: 0;
}

.page-faq__rail-inner {
  padding: var(--space-3);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  background: var(--faq-panel);
}

.page-faq__rail-title {
  margin: 0 0 var(--space-3);
  font-family: var(--font-data);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan-signal);
}

.page-faq__rail-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}

.page-faq__rail-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 10px;
  border-left: 2px solid transparent;
  border-radius: var(--radius-s);
  color: var(--mist-gray);
  font-size: 0.9375rem;
  line-height: 1.45;
  text-decoration: none;
  transition: color 140ms var(--ease-out), background-color 140ms var(--ease-out), border-color 140ms var(--ease-out);
}

.page-faq__rail-link:hover,
.page-faq__rail-link:focus-visible {
  color: var(--paper-light);
  background: var(--wash-cyan);
  border-left-color: var(--cyan-signal);
}

.page-faq__rail-num {
  flex: 0 0 auto;
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: var(--cyan-signal);
}

.page-faq__rail-help {
  padding: var(--space-3);
  border: 1px dashed var(--line-soft);
  border-radius: var(--radius-m);
  background: linear-gradient(160deg, var(--wash-orange), transparent 72%);
}

.page-faq__rail-help-title {
  margin: 0 0 var(--space-2);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--paper-light);
}

.page-faq__rail-help p {
  margin: 0 0 var(--space-2);
  font-size: 0.875rem;
  line-height: 1.65;
  color: var(--mist-gray);
}

.page-faq__rail-help .copy-btn {
  font-family: var(--font-data);
  font-size: 0.8125rem;
  margin-bottom: var(--space-2);
}

.page-faq__rail-help > a {
  display: inline-block;
  font-size: 0.875rem;
  color: var(--cyan-signal);
  border-bottom: 1px solid var(--line-cyan);
  text-decoration: none;
}

.page-faq__rail-help > a:hover {
  border-bottom-color: var(--cyan-signal);
}

.page-faq__flow {
  display: grid;
  gap: var(--space-5);
  min-width: 0;
}

/* ---------- 问答分组 ---------- */

.page-faq__group {
  min-width: 0;
  scroll-margin-top: calc(var(--header-offset) + var(--space-3));
}

.page-faq__group-head {
  margin-bottom: var(--space-3);
  padding-left: var(--space-3);
  border-left: 3px solid var(--cyan-signal);
}

.page-faq__group-title {
  margin: var(--space-1) 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 4.6vw, 2.125rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--paper-light);
}

.page-faq__group-lede {
  margin: 0;
  max-width: 60ch;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--mist-gray);
}

.page-faq__group-figure {
  margin: 0 0 var(--space-4);
}

.page-faq__group-figure .media__frame {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--deep-green-layer);
  clip-path: polygon(0 0, 100% 0, 100% 90%, 0 100%);
}

.page-faq__group-figure .media__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.05);
}

.page-faq__group-figure .media__caption {
  display: block;
  margin-top: var(--space-2);
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--mist-gray);
}

/* ---------- 折叠问答 ---------- */

.page-faq__qa {
  border-top: 1px solid var(--line-soft);
  transition: background-color 160ms var(--ease-out);
}

.page-faq__qa:last-of-type {
  border-bottom: 1px solid var(--line-soft);
}

.page-faq__qa[open] {
  background: linear-gradient(90deg, rgba(43, 240, 200, 0.07), transparent 64%);
}

.page-faq__qa summary {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: var(--space-3) 44px var(--space-3) 0;
  cursor: pointer;
  list-style: none;
  color: var(--paper-light);
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.5;
}

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

.page-faq__qa summary::after {
  content: "";
  position: absolute;
  right: 12px;
  top: 50%;
  width: 9px;
  height: 9px;
  margin-top: -8px;
  border-right: 2px solid var(--cyan-signal);
  border-bottom: 2px solid var(--cyan-signal);
  transform: rotate(45deg);
  transition: transform 200ms var(--ease-out), margin-top 200ms var(--ease-out);
}

.page-faq__qa[open] summary::after {
  transform: rotate(-135deg);
  margin-top: -3px;
}

.page-faq__qa summary:hover {
  color: var(--cyan-signal);
}

.page-faq__qa summary:focus-visible {
  outline: 2px solid var(--cyan-signal);
  outline-offset: 3px;
  border-radius: var(--radius-s);
}

.page-faq__qa-num {
  flex: 0 0 auto;
  padding-top: 0.22em;
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--orange-signal);
}

.page-faq__qa-body {
  padding: 0 16px var(--space-4) 0;
  animation: faqReveal 220ms var(--ease-out);
}

.page-faq__qa-body p {
  margin: 0;
  max-width: 64ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--faq-answer);
}

.page-faq__qa-body strong {
  font-family: var(--font-data);
  font-weight: 600;
  color: var(--cyan-signal);
}

.page-faq__qa-body a {
  color: var(--cyan-signal);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
}

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

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

/* ---------- 结尾行动区 ---------- */

.page-faq__outro {
  position: relative;
  padding: var(--space-5) 0 var(--space-6);
  border-top: 1px solid var(--line-soft);
  background:
    radial-gradient(70% 130% at 88% 0%, rgba(255, 106, 43, 0.14), transparent 70%),
    linear-gradient(180deg, rgba(16, 46, 38, 0.6), transparent);
}

.page-faq__outro-inner {
  display: grid;
  gap: var(--space-3);
}

.page-faq__outro-title {
  margin: var(--space-2) 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 4.2vw, 2.125rem);
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--paper-light);
}

.page-faq__outro-text {
  margin: 0;
  max-width: 58ch;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--mist-gray);
}

.page-faq__outro-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* ---------- 响应式 ---------- */

@media (min-width: 768px) {
  .page-faq__qa-body {
    padding-right: 96px;
  }
}

@media (min-width: 900px) {
  .page-faq__hero-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: var(--space-5);
  }

  .page-faq__outro-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: var(--space-5);
  }

  .page-faq__outro-actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1024px) {
  .page-faq__body {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: var(--space-6);
    align-items: start;
  }

  .page-faq__rail {
    position: sticky;
    top: calc(var(--header-offset) + var(--space-3));
  }
}

@media (max-width: 1023px) {
  .page-faq__rail-inner {
    padding: var(--space-2);
  }

  .page-faq__rail-list {
    display: flex;
    gap: var(--space-1);
    overflow-x: auto;
    padding-bottom: 4px;
    scrollbar-width: none;
  }

  .page-faq__rail-list::-webkit-scrollbar {
    display: none;
  }

  .page-faq__rail-list li {
    flex: 0 0 auto;
  }

  .page-faq__rail-link {
    border: 1px solid var(--line-soft);
    border-radius: 999px;
    padding: 8px 14px;
    white-space: nowrap;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq__qa-body {
    animation: none;
  }

  .page-faq__qa summary::after,
  .page-faq__rail-link,
  .page-faq__qa {
    transition: none;
  }
}