.page-faq {
  --faq-glass: rgba(30, 58, 95, 0.42);
  --faq-glass-strong: rgba(30, 58, 95, 0.65);
  --faq-line: rgba(192, 192, 192, 0.16);
  --faq-yellow-soft: rgba(245, 214, 35, 0.12);
  background: var(--emc-deep-space);
  color: var(--emc-white);
}

/* ===== Hero 封面区 ===== */
.page-faq__hero {
  position: relative;
  overflow: hidden;
  padding-top: 34px;
  padding-bottom: 34px;
  border-bottom: 1px solid var(--faq-line);
  background:
    radial-gradient(ellipse 60% 50% at 82% 18%, rgba(0, 168, 232, 0.16), transparent 70%),
    linear-gradient(118deg, transparent 70%, rgba(245, 214, 35, 0.06) 70%, rgba(245, 214, 35, 0.06) 76%, transparent 76%),
    var(--emc-deep-space);
}

.page-faq__hero-inner {
  position: relative;
}

.page-faq__hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
  padding: 28px 0 36px;
}

.page-faq__hero-copy {
  position: relative;
}

.page-faq__hero-copy .section-kicker {
  display: inline-block;
}

.page-faq__hero h1 {
  font-family: var(--emc-font-heading);
  font-size: var(--emc-h1);
  line-height: 1.04;
  letter-spacing: -0.01em;
  color: var(--emc-white);
  margin: 14px 0 18px;
  max-width: 12em;
}

.page-faq__hero-desc {
  color: var(--emc-silver);
  font-size: 1.02rem;
  line-height: 1.75;
  max-width: 56ch;
  margin: 0;
}

.page-faq__hero-desc a {
  color: var(--emc-signal);
  text-decoration: none;
}

.page-faq__hero-desc a:hover {
  color: var(--emc-yellow);
}

.page-faq__hero-side {
  position: absolute;
  right: -8px;
  bottom: 8px;
  opacity: 0.35;
  color: var(--emc-signal);
}

.page-faq__hero-figure {
  position: relative;
  margin: 0 auto;
  width: min(100%, 320px);
}

.page-faq__hero-img {
  position: relative;
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid rgba(245, 214, 35, 0.4);
  clip-path: polygon(5% 0, 100% 0, 95% 100%, 0 100%);
}

.page-faq__hero-figure::after {
  content: "FAQ";
  position: absolute;
  right: 2px;
  bottom: -2px;
  background: var(--emc-yellow);
  color: var(--emc-deep-space);
  font-family: var(--emc-font-data);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  padding: 5px 12px;
  z-index: 2;
}

.page-faq__hero-strip {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--faq-line);
  font-family: var(--emc-font-data);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--emc-silver);
}

.page-faq__hero-strip-line {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--emc-yellow), transparent);
}

/* ===== 快速索引 ===== */
.page-faq__toc {
  padding-top: clamp(32px, 5vw, 56px);
}

.page-faq__toc-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq__toc-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 18px 16px;
  min-height: 108px;
  background: linear-gradient(135deg, rgba(30, 58, 95, 0.65), rgba(5, 10, 19, 0.75));
  border: 1px solid var(--faq-line);
  color: var(--emc-white);
  text-decoration: none;
  overflow: hidden;
  transition: border-color 0.25s ease, transform 0.3s var(--emc-ease-out);
}

.page-faq__toc-card::after {
  content: "";
  position: absolute;
  right: -18px;
  top: -18px;
  width: 64px;
  height: 64px;
  background: var(--faq-yellow-soft);
  transform: rotate(12deg);
  pointer-events: none;
}

.page-faq__toc-card:hover {
  border-color: var(--emc-yellow);
  transform: translateY(-3px);
}

.page-faq__toc-no {
  font-family: var(--emc-font-data);
  color: var(--emc-yellow);
  font-size: 0.88rem;
  letter-spacing: 0.06em;
}

.page-faq__toc-name {
  font-family: var(--emc-font-heading);
  font-size: 0.95rem;
  letter-spacing: 0.02em;
}

.page-faq__toc-count {
  margin-top: auto;
  font-family: var(--emc-font-data);
  font-size: 0.72rem;
  color: var(--emc-silver);
}

/* ===== 主布局 ===== */
.page-faq__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  padding-top: clamp(40px, 6vw, 64px);
  padding-bottom: clamp(48px, 7vw, 72px);
  align-items: start;
}

.page-faq__aside-inner {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 20px 18px;
  background: rgba(10, 22, 40, 0.72);
  border: 1px solid var(--faq-line);
  backdrop-filter: blur(10px);
}

.page-faq__aside-title {
  font-family: var(--emc-font-data);
  font-size: 0.76rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--emc-yellow);
}

.page-faq__aside-nav {
  display: flex;
  flex-direction: column;
}

.page-faq__aside-nav a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 0;
  color: var(--emc-white);
  text-decoration: none;
  border-bottom: 1px dashed rgba(192, 192, 192, 0.2);
  font-size: 0.92rem;
  transition: color 0.2s ease;
}

.page-faq__aside-nav a span {
  font-family: var(--emc-font-data);
  font-size: 0.72rem;
  color: var(--emc-signal);
}

.page-faq__aside-nav a:hover {
  color: var(--emc-yellow);
}

.page-faq__aside-btn {
  margin-top: 6px;
  justify-content: center;
}

.page-faq__main {
  min-width: 0;
}

/* ===== 章节 ===== */
.page-faq__section + .page-faq__section {
  margin-top: clamp(48px, 7vw, 84px);
  padding-top: clamp(32px, 5vw, 48px);
  border-top: 1px solid var(--faq-line);
}

.page-faq__section-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: clamp(18px, 3vw, 26px);
}

.page-faq__section-no {
  font-family: var(--emc-font-data);
  font-size: clamp(3rem, 7vw, 5.2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--emc-signal);
  opacity: 0.22;
  width: clamp(52px, 8vw, 90px);
  flex-shrink: 0;
  display: grid;
  place-items: center;
}

.page-faq__section-head-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-faq__section-head h2 {
  font-family: var(--emc-font-heading);
  font-size: var(--emc-h3);
  color: var(--emc-white);
  margin: 4px 0 0;
}

/* ===== 图示 ===== */
.page-faq__section-figure {
  margin: 0 0 22px;
}

.page-faq__section-img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--faq-line);
  border-radius: var(--emc-radius);
}

.page-faq__section-figure figcaption {
  margin-top: 8px;
  padding-left: 14px;
  border-left: 2px solid var(--emc-yellow);
  font-family: var(--emc-font-data);
  font-size: 0.76rem;
  color: var(--emc-silver);
  letter-spacing: 0.04em;
}

/* ===== 手风琴 ===== */
.page-faq__accordion {
  display: grid;
  gap: 12px;
}

.page-faq__item {
  background: linear-gradient(180deg, rgba(30, 58, 95, 0.42), rgba(5, 10, 19, 0.6));
  border: 1px solid var(--faq-line);
  transition: border-color var(--emc-transition-base), background var(--emc-transition-base);
}

.page-faq__item[open] {
  border-color: rgba(245, 214, 35, 0.45);
  background: linear-gradient(180deg, rgba(30, 58, 95, 0.62), rgba(5, 10, 19, 0.82));
}

.page-faq__item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: clamp(15px, 2.4vw, 20px) clamp(16px, 2.6vw, 22px);
  color: var(--emc-white);
  font-family: var(--emc-font-body);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.45;
  user-select: none;
}

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

.page-faq__item summary:hover {
  color: var(--emc-yellow);
}

.page-faq__item-icon {
  position: relative;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1px solid rgba(0, 168, 232, 0.6);
  flex-shrink: 0;
  margin-left: auto;
  transition: background 0.25s ease, border-color 0.25s ease;
}

.page-faq__item-icon::before,
.page-faq__item-icon::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--emc-signal);
  transition: background 0.25s ease;
}

.page-faq__item-icon::before {
  width: 10px;
  height: 2px;
}

.page-faq__item-icon::after {
  width: 2px;
  height: 10px;
}

.page-faq__item[open] .page-faq__item-icon {
  background: var(--emc-yellow);
  border-color: var(--emc-yellow);
}

.page-faq__item[open] .page-faq__item-icon::before,
.page-faq__item[open] .page-faq__item-icon::after {
  background: var(--emc-deep-space);
}

.page-faq__item[open] .page-faq__item-icon::after {
  display: none;
}

.page-faq__item-body {
  padding: 4px clamp(16px, 2.6vw, 22px) clamp(18px, 3vw, 24px);
  color: var(--emc-silver);
  font-size: 0.95rem;
  line-height: 1.75;
  max-width: 68ch;
}

.page-faq__item-body p {
  margin: 0 0 12px;
}

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

.page-faq__item-body a {
  color: var(--emc-signal);
  text-decoration: none;
}

.page-faq__item-body a:hover {
  color: var(--emc-yellow);
}

.page-faq__item-meta {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq__item-meta li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 12px;
  background: rgba(10, 22, 40, 0.55);
  border-left: 2px solid var(--emc-signal);
  font-family: var(--emc-font-data);
  font-size: 0.78rem;
  color: var(--emc-white);
}

.page-faq__item-meta li span {
  color: var(--emc-yellow);
  letter-spacing: 0.06em;
}

/* ===== 延伸入口 ===== */
.page-faq__extensions {
  background:
    linear-gradient(180deg, rgba(30, 58, 95, 0.18), transparent),
    var(--emc-shadow);
  border-top: 1px solid var(--faq-line);
  padding: clamp(40px, 7vw, 72px) 0 clamp(48px, 8vw, 88px);
}

.page-faq__ext-head {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  margin-bottom: 28px;
}

.page-faq__ext-head .v-text {
  color: var(--emc-signal);
  opacity: 0.6;
}

.page-faq__ext-head h2 {
  font-family: var(--emc-font-heading);
  font-size: var(--emc-h3);
  color: var(--emc-white);
  margin: 4px 0 0;
}

.page-faq__ext-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-faq__ext-card {
  display: grid;
  grid-template-areas:
    "no arrow"
    "title title"
    "desc desc";
  gap: 4px 12px;
  padding: 22px 20px;
  background: linear-gradient(145deg, rgba(30, 58, 95, 0.55), rgba(5, 10, 19, 0.85));
  border: 1px solid var(--faq-line);
  text-decoration: none;
  color: var(--emc-white);
  transition: transform 0.3s var(--emc-ease-out), border-color 0.25s ease, background 0.25s ease;
}

.page-faq__ext-card:hover {
  transform: translateY(-4px);
  border-color: var(--emc-yellow);
  background: linear-gradient(145deg, rgba(30, 58, 95, 0.8), rgba(10, 22, 40, 0.95));
}

.page-faq__ext-no {
  grid-area: no;
  font-family: var(--emc-font-heading);
  font-size: 2rem;
  color: var(--emc-yellow);
  line-height: 1;
}

.page-faq__ext-arrow {
  grid-area: arrow;
  justify-self: end;
  align-self: start;
  color: var(--emc-signal);
  font-size: 1.25rem;
  transition: transform 0.25s ease;
}

.page-faq__ext-card:hover .page-faq__ext-arrow {
  transform: translateX(4px);
}

.page-faq__ext-title {
  grid-area: title;
  font-family: var(--emc-font-heading);
  font-size: 1.05rem;
  margin-top: 6px;
}

.page-faq__ext-desc {
  grid-area: desc;
  color: var(--emc-silver);
  font-size: 0.86rem;
  line-height: 1.6;
  margin-top: 2px;
}

/* ===== 响应式 ===== */
@media (min-width: 480px) {
  .page-faq__item-meta {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 660px) {
  .page-faq__ext-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-faq__toc-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 860px) {
  .page-faq__hero-grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(260px, 0.75fr);
    padding-top: 40px;
    padding-bottom: 48px;
  }

  .page-faq__hero-figure {
    width: auto;
    margin-right: 0;
  }

  .page-faq__hero-side {
    display: block;
  }
}

@media (min-width: 960px) {
  .page-faq__layout {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-faq__aside {
    position: sticky;
    top: calc(var(--emc-header-h) + 24px);
  }

  .page-faq__main {
    max-width: 860px;
  }
}

@media (min-width: 1020px) {
  .page-faq__ext-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-faq__toc-list {
    grid-template-columns: repeat(4, 1fr);
  }
}