.page-faq {
  --faq-card-bg: rgba(13, 23, 48, 0.62);
  --faq-card-bg-open: rgba(13, 23, 48, 0.92);
  --faq-line-soft: 1px solid var(--c-steel);
  color: var(--c-paper);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(36px, 6vw, 78px) 0 clamp(34px, 5vw, 60px);
  border-bottom: 2px solid var(--c-steel);
  background:
    radial-gradient(120% 130% at 90% 0%, rgba(139, 92, 246, 0.22) 0%, rgba(6, 11, 24, 0) 58%),
    radial-gradient(90% 95% at 2% 100%, rgba(47, 224, 224, 0.16) 0%, rgba(6, 11, 24, 0) 62%),
    var(--c-void);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  top: -32%;
  width: 58%;
  height: 160%;
  background: linear-gradient(120deg, rgba(47, 224, 224, 0.14) 0%, rgba(139, 92, 246, 0.22) 100%);
  clip-path: polygon(40% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-faq .faq-hero-shell {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 44px);
}

@media (min-width: 900px) {
  .page-faq .faq-hero-shell {
    grid-template-columns: minmax(0, 1.15fr) minmax(290px, 0.85fr);
    align-items: end;
  }
}

.page-faq .faq-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--c-mist);
}

.page-faq .faq-crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--c-steel);
}

.page-faq .faq-crumbs a {
  color: var(--c-mist);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-faq .faq-crumbs a:hover,
.page-faq .faq-crumbs a:focus-visible {
  color: var(--c-orange);
}

.page-faq .faq-crumbs [aria-current="page"] {
  color: var(--c-paper);
}

.page-faq .faq-hero h1 {
  margin: 0 0 18px;
  max-width: 20ch;
  font-size: clamp(30px, 5.4vw, 52px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.page-faq .faq-lead {
  margin: 0 0 28px;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--c-mist);
}

.page-faq .faq-hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-hero-stats li {
  padding: 12px 0 12px 16px;
  border-left: 3px solid var(--c-cyan);
  background: linear-gradient(90deg, rgba(47, 224, 224, 0.12) 0%, rgba(47, 224, 224, 0) 100%);
}

.page-faq .faq-stat-num {
  display: block;
  font-size: 20px;
  font-weight: 700;
  color: var(--c-cyan);
}

.page-faq .faq-stat-label {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  color: var(--c-mist);
}

.page-faq .faq-hero-panel {
  padding: 22px 20px;
  border: 2px solid var(--c-steel);
  background: rgba(13, 23, 48, 0.86);
  box-shadow: var(--shadow-block);
}

.page-faq .faq-panel-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-mist);
}

.page-faq .faq-panel-list {
  display: grid;
  gap: 10px;
  margin: 0 0 16px;
  padding: 0;
  list-style: none;
}

.page-faq .faq-panel-list a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border: 2px solid var(--c-steel);
  background: var(--c-void);
  color: var(--c-paper);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.page-faq .faq-panel-list a:hover,
.page-faq .faq-panel-list a:focus-visible {
  border-color: var(--c-orange);
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-cyan);
}

.page-faq .faq-panel-list .mono {
  color: var(--c-violet);
  font-size: 12px;
}

.page-faq .faq-panel-note {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-mist);
}

/* ---------- 主体布局 ---------- */
.page-faq .faq-main {
  padding-block: clamp(32px, 5vw, 70px);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: 224px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }
}

/* ---------- 主题索引 ---------- */
.page-faq .faq-index {
  padding: 16px 14px;
  border-top: 3px solid var(--c-cyan);
  background: linear-gradient(180deg, rgba(13, 23, 48, 0.9) 0%, rgba(6, 11, 24, 0.9) 100%);
}

@media (min-width: 960px) {
  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }
}

.page-faq .faq-index-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-mist);
}

.page-faq .faq-index-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
}

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

.page-faq .faq-index-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 12px;
  border-left: 3px solid var(--c-steel);
  color: var(--c-mist);
  font-size: 14px;
  white-space: nowrap;
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.page-faq .faq-index-link .mono {
  font-size: 12px;
  color: var(--c-violet);
  transition: color 0.2s ease;
}

.page-faq .faq-index-link:hover,
.page-faq .faq-index-link:focus-visible {
  color: var(--c-paper);
  border-left-color: var(--c-orange);
  background: rgba(255, 122, 47, 0.08);
}

.page-faq .faq-index-link:hover .mono,
.page-faq .faq-index-link:focus-visible .mono {
  color: var(--c-orange);
}

@media (min-width: 960px) {
  .page-faq .faq-index-list {
    display: grid;
    gap: 4px;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-faq .faq-index-list li {
    flex: none;
  }

  .page-faq .faq-index-link {
    white-space: normal;
  }
}

/* ---------- 分组 ---------- */
.page-faq .faq-stream {
  display: grid;
  gap: clamp(34px, 5vw, 62px);
  min-width: 0;
}

.page-faq .faq-group {
  padding-top: clamp(22px, 3vw, 32px);
  border-top: 2px solid var(--c-steel);
  scroll-margin-top: calc(var(--header-h) + 22px);
}

.page-faq .faq-group-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 16px;
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-faq .faq-group-num {
  grid-row: span 2;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 46px;
  height: 46px;
  border: 2px solid var(--c-steel);
  background: var(--c-deep);
  color: var(--c-cyan);
  font-size: 15px;
  font-weight: 700;
  transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

.page-faq .faq-group:target {
  border-top-color: var(--c-cyan);
}

.page-faq .faq-group:target .faq-group-num {
  background: var(--grad-brand);
  border-color: transparent;
  color: var(--c-void);
}

.page-faq .faq-group-head h2 {
  margin: 0;
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.page-faq .faq-group-lead {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.72;
  color: var(--c-mist);
}

/* ---------- 图 ---------- */
.page-faq .faq-figure {
  margin: 0 0 clamp(20px, 3vw, 30px);
  border: 2px solid var(--c-steel);
  background: var(--c-deep);
  box-shadow: var(--shadow-block);
}

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

.page-faq .faq-figure figcaption {
  padding: 12px 16px;
  border-top: var(--faq-line-soft);
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-mist);
}

/* ---------- 步骤条 ---------- */
.page-faq .faq-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 0 0 clamp(20px, 3vw, 30px);
  padding: 0;
  list-style: none;
}

@media (min-width: 640px) {
  .page-faq .faq-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 34px;
  }
}

.page-faq .faq-step {
  position: relative;
  padding: 18px 20px;
  border: 2px solid var(--c-steel);
  background: linear-gradient(180deg, rgba(13, 23, 48, 0.92) 0%, rgba(6, 11, 24, 0.92) 100%);
}

.page-faq .faq-step + .faq-step::before {
  content: "";
  position: absolute;
  left: 50%;
  top: -14px;
  width: 2px;
  height: 14px;
  transform: translateX(-50%);
  background: var(--grad-brand);
}

@media (min-width: 640px) {
  .page-faq .faq-step + .faq-step::before {
    left: -34px;
    top: 34px;
    width: 34px;
    height: 2px;
    transform: none;
  }
}

.page-faq .faq-step-num {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-cyan);
}

.page-faq .faq-step-title {
  margin: 8px 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--c-paper);
}

.page-faq .faq-step-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-mist);
}

/* ---------- 权益四维卡片 ---------- */
.page-faq .faq-matrix {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: clamp(20px, 3vw, 30px);
}

@media (min-width: 760px) {
  .page-faq .faq-matrix {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-faq .faq-matrix-card {
  padding: 18px;
  border: 2px solid var(--c-steel);
  background: linear-gradient(160deg, rgba(47, 224, 224, 0.07) 0%, rgba(139, 92, 246, 0.07) 62%, rgba(6, 11, 24, 0.35) 100%);
}

.page-faq .faq-matrix-key {
  margin: 0 0 14px;
  padding-left: 10px;
  border-left: 4px solid var(--c-orange);
  font-size: 17px;
  font-weight: 700;
  color: var(--c-paper);
}

.page-faq .faq-matrix-meta {
  display: grid;
  gap: 10px;
  margin: 0;
}

.page-faq .faq-matrix-meta dt {
  margin-bottom: 3px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.page-faq .faq-matrix-meta dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-mist);
}

/* ---------- 问答折叠 ---------- */
.page-faq .faq-items {
  display: grid;
  gap: 12px;
}

.page-faq .faq-item {
  border: 2px solid var(--c-steel);
  background: var(--faq-card-bg);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.page-faq .faq-item[open] {
  border-color: var(--c-cyan);
  background: var(--faq-card-bg-open);
}

.page-faq .faq-item > summary {
  position: relative;
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 16px 52px 16px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--c-paper);
  transition: color 0.2s ease;
}

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

.page-faq .faq-item > summary::after {
  content: "";
  position: absolute;
  right: 22px;
  top: 50%;
  width: 10px;
  height: 10px;
  margin-top: -7px;
  border-right: 2px solid var(--c-orange);
  border-bottom: 2px solid var(--c-orange);
  transform: rotate(45deg);
  transition: transform 0.22s ease, margin-top 0.22s ease;
}

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

.page-faq .faq-item > summary:hover,
.page-faq .faq-item > summary:focus-visible {
  color: var(--c-cyan);
}

.page-faq .faq-q {
  flex: 0 0 auto;
  padding-top: 4px;
  font-size: 12px;
  color: var(--c-violet);
}

.page-faq .faq-q-text {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .faq-answer {
  padding: 14px 18px 20px;
  border-top: var(--faq-line-soft);
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-mist);
}

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

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

.page-faq .faq-answer strong {
  color: var(--c-paper);
}

.page-faq .faq-answer a {
  color: var(--c-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-answer a:hover,
.page-faq .faq-answer a:focus-visible {
  color: var(--c-orange);
}

/* ---------- 联系区块 ---------- */
.page-faq .faq-contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

@media (min-width: 760px) {
  .page-faq .faq-contact-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-faq .faq-prepare,
.page-faq .faq-channel {
  padding: 20px;
  border: 2px solid var(--c-steel);
  background: rgba(13, 23, 48, 0.72);
}

.page-faq .faq-prepare-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-mist);
}

.page-faq .faq-prepare-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-prepare-list li {
  display: flex;
  gap: 10px;
  font-size: 14px;
  line-height: 1.68;
  color: var(--c-mist);
}

.page-faq .faq-prepare-list .mono {
  flex: 0 0 auto;
  color: var(--c-violet);
}

.page-faq .faq-channel-list {
  display: grid;
  gap: 12px;
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
}

.page-faq .faq-channel-list li {
  display: grid;
  gap: 4px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--c-steel);
  font-size: 14px;
  color: var(--c-mist);
}

.page-faq .faq-channel-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-faq .faq-channel-key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-mist);
}

.page-faq .faq-channel-list .mono {
  font-size: 15px;
  color: var(--c-cyan);
  word-break: break-all;
}

.page-faq .faq-tail {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-mist);
}

.page-faq .faq-tail a {
  color: var(--c-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-tail a:hover,
.page-faq .faq-tail a:focus-visible {
  color: var(--c-orange);
}