.page-faq {
  --faq-line: rgba(28, 44, 82, .82);
  --faq-gap: clamp(24px, 4vw, 48px);
  --faq-cut: 16px;
  display: block;
}

/* ---------- 面包屑与首屏 ---------- */
.page-faq .breadcrumb {
  padding: clamp(14px, 2.2vw, 24px) 0 0;
}

.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-bottom: clamp(20px, 3vw, 34px);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  right: -12%;
  top: -22%;
  width: min(70vw, 640px);
  aspect-ratio: 1;
  background: linear-gradient(142deg, rgba(34, 224, 200, .16), rgba(34, 224, 200, 0) 62%);
  clip-path: polygon(30% 0, 100% 0, 100% 70%, 70% 100%, 0 100%, 0 30%);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: min(42%, 460px);
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), rgba(34, 224, 200, 0));
  pointer-events: none;
}

.page-faq .faq-hero-inner {
  position: relative;
  padding: clamp(24px, 4vw, 44px) 0 clamp(20px, 3vw, 34px);
}

.page-faq .faq-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.6vw, 74px);
  line-height: 1.04;
  letter-spacing: -.02em;
  color: var(--ice);
  margin: 14px 0 clamp(16px, 2vw, 26px);
  max-width: 20ch;
}

.page-faq .faq-lede {
  max-width: 58ch;
  margin: 0 0 clamp(18px, 2.4vw, 28px);
  font-size: clamp(15px, 1.4vw, 17.5px);
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 22px;
}

.page-faq .faq-hero-note {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--mist);
  text-transform: uppercase;
}

.page-faq .faq-hero-vnote {
  position: absolute;
  top: clamp(96px, 13vw, 170px);
  right: clamp(10px, 2.6vw, 36px);
  margin: 0;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .34em;
  color: rgba(147, 162, 192, .5);
  pointer-events: none;
}

/* ---------- 主体栅格 ---------- */
.page-faq .faq-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-gap);
  padding-top: clamp(12px, 2vw, 24px);
  padding-bottom: clamp(52px, 8vw, 110px);
}

/* ---------- 左侧分类目录 ---------- */
.page-faq .faq-index-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--mist);
}

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

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

.page-faq .faq-index-list a {
  position: relative;
  display: block;
  padding: 11px 18px 11px 20px;
  background: var(--panel);
  color: var(--mist);
  font-size: 14px;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .faq-index-list a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--cyan);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform var(--dur) var(--ease);
}

.page-faq .faq-index-list a:hover,
.page-faq .faq-index-list a:focus-visible {
  color: var(--ice);
  background: var(--carbon);
  outline: none;
}

.page-faq .faq-index-list a:hover::before,
.page-faq .faq-index-list a:focus-visible::before {
  transform: scaleY(1);
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-block {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-faq .faq-block + .faq-block {
  margin-top: clamp(36px, 5vw, 68px);
}

.page-faq .faq-block + .faq-block::before {
  content: "";
  display: block;
  height: 9px;
  margin-bottom: clamp(26px, 3.6vw, 46px);
  background: repeating-linear-gradient(114deg, var(--steel) 0 2px, transparent 2px 15px);
  opacity: .85;
}

.page-faq .faq-block-head {
  margin-bottom: clamp(16px, 2.2vw, 26px);
}

.page-faq .faq-block-num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .26em;
  color: var(--cyan-deep);
}

.page-faq .faq-block-head h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 2.9vw, 38px);
  line-height: 1.16;
  letter-spacing: -.015em;
  color: var(--ice);
  transition: color var(--dur) var(--ease);
}

.page-faq .faq-block.is-current .faq-block-head h2 {
  color: var(--cyan);
}

.page-faq .faq-block-sub {
  margin: 0;
  max-width: 52ch;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 图文说明 ---------- */
.page-faq .faq-figure {
  margin: 0 0 clamp(18px, 2.4vw, 28px);
  background: var(--panel);
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 0 100%);
  overflow: hidden;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(.96);
}

.page-faq .faq-figure figcaption {
  padding: 12px 18px 16px;
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: .04em;
  color: var(--mist);
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa {
  background: var(--panel);
  border: 1px solid var(--steel);
  clip-path: polygon(0 0, calc(100% - var(--faq-cut)) 0, 100% var(--faq-cut), 100% 100%, 0 100%);
  transition: border-color var(--dur) var(--ease);
}

.page-faq .qa + .qa {
  margin-top: 10px;
}

.page-faq .qa[open],
.page-faq .qa:hover {
  border-color: rgba(34, 224, 200, .45);
}

.page-faq .qa summary {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 17px 20px;
  cursor: pointer;
  list-style: none;
  color: var(--ice);
  font-size: clamp(15px, 1.35vw, 17px);
  font-weight: 600;
  line-height: 1.55;
  transition: color var(--dur) var(--ease);
}

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

.page-faq .qa summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-faq .qa summary:hover,
.page-faq .qa[open] summary {
  color: var(--cyan);
}

.page-faq .qa-q {
  flex: 1 1 auto;
}

.page-faq .qa-icon {
  position: relative;
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  margin-top: 3px;
}

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

.page-faq .qa-icon::before {
  left: 0;
  top: 8px;
  width: 16px;
  height: 2px;
}

.page-faq .qa-icon::after {
  left: 7px;
  top: 1px;
  width: 2px;
  height: 16px;
}

.page-faq .qa[open] .qa-icon::after {
  transform: rotate(90deg);
  opacity: 0;
}

.page-faq .qa-body {
  padding: 0 20px 20px;
}

.page-faq .qa[open] .qa-body {
  animation: faqDrop 240ms var(--ease) both;
}

@keyframes faqDrop {
  from {
    opacity: 0;
    transform: translateY(-9px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-faq .qa-when {
  margin: 0 0 10px;
  padding-top: 12px;
  border-top: 1px dashed rgba(147, 162, 192, .3);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mist);
}

.page-faq .qa-answer {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.82;
  color: rgba(242, 246, 255, .84);
}

.page-faq .qa-answer a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 224, 200, .5);
}

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

/* ---------- 联系渠道 ---------- */
.page-faq .faq-channels {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-bottom: clamp(24px, 3.4vw, 40px);
}

.page-faq .faq-channel {
  padding: 20px 22px 22px;
  background: var(--carbon);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

.page-faq .faq-channel-label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-channel-value {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: clamp(14px, 1.5vw, 16.5px);
  line-height: 1.5;
  color: var(--ice);
  word-break: break-word;
}

.page-faq .faq-channel-note {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .faq-copy {
  margin-top: 14px;
}

.page-faq .faq-copy.is-copied {
  color: var(--night);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 来信清单 ---------- */
.page-faq .faq-checklist {
  padding: clamp(20px, 3vw, 32px);
  background: var(--panel);
  border-left: 3px solid var(--orange);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
}

.page-faq .faq-checklist h3 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 1.9vw, 22px);
  color: var(--ice);
}

.page-faq .faq-checklist ul {
  margin: 0 0 16px;
  padding: 0;
  list-style: none;
}

.page-faq .faq-checklist li {
  position: relative;
  padding-left: 22px;
  margin-bottom: 9px;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(242, 246, 255, .84);
}

.page-faq .faq-checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 9px;
  height: 9px;
  background: var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% 100%);
}

.page-faq .faq-checklist p {
  margin: 0;
  max-width: 60ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-checklist a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 224, 200, .5);
}

/* ---------- 页尾相关入口 ---------- */
.page-faq .faq-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-faq .faq-links a {
  padding: 9px 16px;
  font-size: 13.5px;
  letter-spacing: .02em;
  color: var(--mist);
  text-decoration: none;
  background: var(--panel);
  border: 1px solid var(--steel);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-links a:hover,
.page-faq .faq-links a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  outline: none;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-channels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-shell {
    grid-template-columns: minmax(196px, 232px) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-faq .faq-index-list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-index-list li + li {
    margin-top: 6px;
  }

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

  .page-faq .qa summary {
    padding: 19px 24px;
  }

  .page-faq .qa-body {
    padding: 0 24px 24px;
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-channels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq-lede {
    font-size: 18px;
  }
}

@media (max-width: 640px) {
  .page-faq .faq-hero-vnote {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa[open] .qa-body {
    animation: none;
  }

  .page-faq .qa-icon::before,
  .page-faq .qa-icon::after,
  .page-faq .faq-index-list a,
  .page-faq .faq-index-list a::before {
    transition: none;
  }
}