.page-faq {
  --faq-aside-w: 232px;
  display: block;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
}

.page-faq *,
.page-faq *::before,
.page-faq *::after {
  box-sizing: border-box;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  background: var(--paper-2);
  border-bottom: 1px solid var(--line);
  padding: 28px 0 36px;
}

.page-faq .hero-shape {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 200px;
  background: var(--forest);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 68%);
  z-index: 0;
}

.page-faq .hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 22px;
}

.page-faq .hero-index {
  min-height: 176px;
  padding-top: 4px;
}

.page-faq .hero-eyebrow {
  margin: 0;
  color: var(--gold);
  letter-spacing: 0.2em;
}

.page-faq .hero-num {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 8px 0 0;
  font-family: var(--mono);
  font-size: clamp(40px, 11vw, 58px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--gold);
}

.page-faq .hero-num .unit {
  font-size: 0.3em;
  letter-spacing: 0.2em;
  color: var(--forest-ink);
}

.page-faq .hero-note {
  margin: 10px 0 0;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.06em;
  color: var(--forest-muted);
}

.page-faq .hero-copy .breadcrumb {
  margin-bottom: 14px;
}

.page-faq .hero-copy h1 {
  margin: 0 0 16px;
  font-size: clamp(28px, 7.4vw, 54px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-faq .hero-copy .lede {
  margin: 0 0 14px;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-faq .hero-meta {
  margin: 0;
  padding-left: 12px;
  border-left: 3px solid var(--orange);
  font-size: 13px;
  line-height: 1.7;
  color: var(--gray);
}

/* ---------- 主体分栏 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: 30px;
  padding-top: clamp(30px, 5vw, 60px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-faq .faq-aside {
  border-bottom: 1px solid var(--line);
  padding-bottom: 16px;
}

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

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

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

.page-faq .aside-list a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink-soft);
  font-size: 13px;
  white-space: nowrap;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .aside-list a:hover,
.page-faq .aside-list a:focus-visible {
  color: var(--orange-deep);
  border-color: var(--orange);
  background: var(--orange-soft);
}

.page-faq .aside-list .index-no {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--gray);
}

.page-faq .aside-list a:hover .index-no {
  color: var(--orange-deep);
}

.page-faq .aside-card {
  display: none;
  margin-top: 20px;
  padding: 16px 18px;
  background: var(--paper-2);
  border: 1px solid var(--ink);
  box-shadow: 4px 4px 0 0 var(--line);
}

.page-faq .aside-card-title {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orange-deep);
}

.page-faq .aside-card p {
  margin: 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--ink-soft);
}

/* ---------- 问答流 ---------- */
.page-faq .faq-sec {
  padding-bottom: clamp(30px, 4vw, 52px);
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 96px;
}

.page-faq .faq-sec + .faq-sec {
  padding-top: clamp(30px, 4vw, 52px);
}

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

.page-faq .sec-head {
  max-width: 68ch;
}

.page-faq .sec-head .eyebrow {
  margin: 0 0 8px;
  color: var(--orange-deep);
  letter-spacing: 0.16em;
}

.page-faq .sec-head h2 {
  margin: 0 0 12px;
  font-size: clamp(23px, 4.4vw, 34px);
  font-weight: 900;
  line-height: 1.24;
  letter-spacing: -0.015em;
  color: var(--ink);
}

.page-faq .sec-lede {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-faq .sec-lede a,
.page-faq .faq-sec a:not(.btn):not(.phen-link) {
  color: var(--ice-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .sec-lede a:hover,
.page-faq .faq-sec a:not(.btn):not(.phen-link):hover {
  color: var(--orange-deep);
}

/* ---------- 现象卡片 ---------- */
.page-faq .phen-grid {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-faq .phen-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 18px 16px;
  background: var(--paper);
  border: 1px solid var(--ink);
  box-shadow: 4px 4px 0 0 var(--line);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-faq .phen-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: 7px 7px 0 0 var(--orange-soft), 7px 7px 0 1px var(--orange);
}

.page-faq .phen-no {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-faq .phen-title {
  margin: 0;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--ink);
}

.page-faq .phen-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ink-soft);
}

.page-faq .phen-signal {
  margin: 0;
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--gray);
}

.page-faq .phen-link {
  margin-top: 4px;
  align-self: flex-start;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ice-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--ice);
  padding-bottom: 2px;
}

.page-faq .phen-link:hover,
.page-faq .phen-link:focus-visible {
  color: var(--orange-deep);
  border-bottom-color: var(--orange);
}

/* ---------- 图片容器 ---------- */
.page-faq .media-frame {
  margin: 28px 0 0;
  background: var(--paper-2);
  border: 1px solid var(--ink);
  box-shadow: 6px 6px 0 0 var(--line);
}

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

.page-faq .figure-caption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1.75;
  color: var(--gray);
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa {
  margin-top: 12px;
  background: var(--paper);
  border: 1px solid var(--line);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-faq .qa[open] {
  border-color: var(--ink);
  box-shadow: 4px 4px 0 0 var(--line);
}

.page-faq .qa summary {
  position: relative;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 15px 44px 15px 16px;
  list-style: none;
  cursor: pointer;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.55;
  color: var(--ink);
}

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

.page-faq .qa summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 12px;
  font-family: var(--mono);
  font-size: 20px;
  line-height: 1;
  color: var(--orange);
}

.page-faq .qa[open] summary::after {
  content: "\2013";
}

.page-faq .qa summary:hover {
  background: var(--orange-soft);
}

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

.page-faq .qa-no {
  flex: 0 0 auto;
  padding-top: 3px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--gray);
}

.page-faq .qa-body {
  padding: 14px 16px 20px;
  border-top: 1px dashed var(--line);
}

.page-faq .qa-body > p:first-child {
  margin-top: 0;
}

.page-faq .steps {
  list-style: none;
  margin: 0;
  padding: 0 0 0 16px;
  border-left: 1px solid var(--ice);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-faq .steps li {
  display: flex;
  gap: 12px;
}

.page-faq .step-no {
  flex: 0 0 auto;
  padding-top: 2px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--orange-deep);
}

.page-faq .step-txt {
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-faq .step-txt a {
  color: var(--ice-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .tipbar {
  margin: 16px 0 0;
  padding: 13px 16px;
  background: var(--ice-soft);
  border-left: 3px solid var(--ice-deep);
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-faq .tipbar a {
  color: var(--orange-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 反馈面板 ---------- */
.page-faq .contact-panel {
  margin-top: 22px;
  padding: clamp(20px, 3.4vw, 32px);
  background: var(--forest);
  color: var(--forest-ink);
  border: 1px solid var(--forest-deep);
  box-shadow: 6px 6px 0 0 var(--line);
}

.page-faq .contact-panel-title {
  margin: 0;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--paper);
}

.page-faq .feed-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-faq .feed-list li {
  display: flex;
  gap: 10px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--forest-ink);
}

.page-faq .feed-list li::before {
  content: "";
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  margin-top: 9px;
  background: var(--gold);
}

.page-faq .contact-panel-note {
  margin: 20px 0 18px;
  padding-top: 14px;
  border-top: 1px solid rgba(156, 179, 171, 0.35);
  font-size: 13px;
  line-height: 1.75;
  color: var(--forest-muted);
}

.page-faq .contact-panel .btn-primary {
  border-color: var(--orange);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .phen-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .hero-copy h1 {
    font-size: clamp(34px, 5.6vw, 56px);
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    padding: 0;
  }

  .page-faq .hero-shape {
    right: auto;
    width: 47%;
    height: 100%;
    clip-path: polygon(0 0, 100% 0, 74% 100%, 0 100%);
  }

  .page-faq .hero-grid {
    grid-template-columns: minmax(0, 4.6fr) minmax(0, 7.4fr);
    gap: clamp(24px, 4vw, 56px);
    align-items: center;
    padding-top: clamp(56px, 7vw, 92px);
    padding-bottom: clamp(56px, 7vw, 92px);
  }

  .page-faq .hero-index {
    min-height: 0;
    padding-right: 24px;
  }

  .page-faq .hero-copy {
    padding-left: 8px;
  }

  .page-faq .faq-body {
    grid-template-columns: minmax(0, 1fr) minmax(0, 2.4fr);
    gap: clamp(30px, 3.4vw, 56px);
    align-items: start;
  }

  .page-faq .faq-aside {
    position: sticky;
    top: 100px;
    border-bottom: 0;
    border-right: 1px solid var(--line);
    padding: 0 20px 0 0;
  }

  .page-faq .aside-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    border-left: 1px solid var(--line);
  }

  .page-faq .aside-list li {
    flex: 1 1 auto;
  }

  .page-faq .aside-list a {
    border: 0;
    border-left: 2px solid transparent;
    margin-left: -1px;
    padding: 10px 12px;
    background: transparent;
    white-space: normal;
    font-size: 14px;
  }

  .page-faq .aside-list a:hover,
  .page-faq .aside-list a:focus-visible {
    background: var(--orange-soft);
    border-left-color: var(--orange);
  }

  .page-faq .aside-card {
    display: block;
  }
}

@media (min-width: 1180px) {
  .page-faq .phen-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .phen-card,
  .page-faq .qa,
  .page-faq .aside-list a {
    transition: none;
  }

  .page-faq .phen-card:hover {
    transform: none;
  }
}