.page-faq {
  --faq-line-strong: rgba(201, 162, 39, .34);
  --faq-line-soft: rgba(232, 207, 122, .2);
  --acc-line: var(--line-paper);
  --acc-title: var(--charcoal);
  --acc-body: #3c4247;
  --faq-sticky: calc(var(--header-offset) + 10px);
}

.page-faq .faq-hero,
.page-faq .faq-sec--dark {
  --acc-line: rgba(232, 207, 122, .18);
  --acc-title: var(--paper);
  --acc-body: rgba(245, 241, 230, .76);
  --faq-line-strong: rgba(232, 207, 122, .3);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(30px, 5.6vw, 74px) 0 clamp(40px, 6.4vw, 84px);
  color: var(--paper);
  background:
    radial-gradient(125% 95% at 84% -8%, rgba(23, 89, 74, .62) 0%, rgba(8, 37, 31, 0) 62%),
    linear-gradient(158deg, var(--ink-900) 0%, var(--ink-700) 58%, var(--ink-500) 132%);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .34;
  background-image:
    repeating-linear-gradient(90deg, rgba(232, 207, 122, .07) 0 1px, transparent 1px 84px),
    repeating-linear-gradient(0deg, rgba(232, 207, 122, .05) 0 1px, transparent 1px 84px);
}

.page-faq .faq-hero-shell {
  position: relative;
  display: grid;
  gap: clamp(30px, 5vw, 48px);
  align-items: start;
}

.page-faq .faq-hero-main {
  min-width: 0;
}

.page-faq .faq-hero .breadcrumb {
  font-size: 13.5px;
  letter-spacing: .02em;
  color: rgba(245, 241, 230, .58);
}

.page-faq .faq-hero .breadcrumb a {
  color: var(--gold-soft);
  text-decoration: none;
}

.page-faq .faq-hero .breadcrumb a:hover {
  text-decoration: underline;
}

.page-faq .faq-hero .eyebrow {
  margin: 16px 0 0;
  color: var(--gold);
}

.page-faq .faq-h1 {
  margin: 10px 0 18px;
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(29px, 5.4vw, 56px);
  line-height: 1.16;
  letter-spacing: .005em;
  color: var(--paper);
  text-wrap: balance;
}

.page-faq .faq-lede {
  margin: 0 0 clamp(26px, 3.6vw, 40px);
  max-width: 40em;
  font-size: clamp(15.5px, 1.8vw, 17.5px);
  line-height: 1.85;
  color: rgba(245, 241, 230, .8);
}

.page-faq .faq-hero-aside {
  min-width: 0;
}

.page-faq .faq-hero-media {
  border-radius: var(--radius-card);
  border: 1px solid var(--faq-line-strong);
  box-shadow: var(--shadow-float);
  overflow: hidden;
  margin: 0;
}

.page-faq .faq-hero-aside .media-caption {
  margin: 12px 2px 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(245, 241, 230, .6);
}

/* ---------- 手风琴通用 ---------- */
.page-faq .faq-q-heading {
  margin: 0;
  font-size: 1rem;
  font-weight: 400;
}

.page-faq .accordion-item {
  position: relative;
  border-bottom: 1px solid var(--acc-line);
}

.page-faq .accordion-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 2px;
  height: 0;
  background: var(--gold);
  transition: height .32s ease-out;
}

.page-faq .accordion-item:has(.accordion-trigger[aria-expanded="true"])::before {
  height: 100%;
}

.page-faq .accordion-trigger {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  padding: 18px 2px 17px 20px;
  border: 0;
  background: none;
  text-align: left;
  cursor: pointer;
  color: var(--acc-title);
  font-family: var(--font-body);
  font-size: clamp(15.5px, 1.85vw, 17px);
  font-weight: 600;
  line-height: 1.62;
  transition: color .2s ease-out;
}

.page-faq .accordion-trigger:hover {
  color: var(--gold);
}

.page-faq .accordion-icon {
  flex: 0 0 auto;
  position: relative;
  width: 22px;
  height: 22px;
  margin-top: 2px;
  border: 1px solid var(--faq-line-strong);
  border-radius: 50%;
  color: var(--gold);
}

.page-faq .accordion-icon::before,
.page-faq .accordion-icon::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: currentColor;
}

.page-faq .accordion-icon::before {
  width: 10px;
  height: 1.5px;
  transform: translate(-50%, -50%);
}

.page-faq .accordion-icon::after {
  width: 1.5px;
  height: 10px;
  transform: translate(-50%, -50%);
  transition: transform .22s ease-out;
}

.page-faq .accordion-trigger[aria-expanded="true"] .accordion-icon::after {
  transform: translate(-50%, -50%) scaleY(0);
}

.page-faq .accordion-panel {
  padding: 0 2px 22px 20px;
  color: var(--acc-body);
  font-size: 16px;
  line-height: 1.82;
}

.page-faq .faq-a > p {
  margin: 0 0 1.05em;
  max-width: 64ch;
}

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

.page-faq .faq-next {
  margin-top: 4px;
}

.page-faq .faq-next a {
  display: inline-block;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid var(--faq-line-strong);
  padding-bottom: 2px;
  transition: color .2s ease-out, border-color .2s ease-out;
}

.page-faq .faq-next a:hover {
  color: var(--gold-soft);
  border-color: var(--gold-soft);
}

/* 首屏快速问答 */
.page-faq .faq-quick {
  border-top: 1px solid var(--faq-line-soft);
}

.page-faq .faq-quick .accordion-panel {
  padding-bottom: 18px;
}

/* 易错算式 */
.page-faq .faq-formula {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: .01em;
  line-height: 1.6;
  margin: 0 0 14px;
  padding: 11px 14px;
  border-radius: 10px;
  border-left: 3px solid var(--gold);
  background: rgba(14, 58, 49, .07);
  color: var(--ink-700);
  overflow-x: auto;
  white-space: nowrap;
}

.page-faq .faq-formula--wrong {
  border-left-color: var(--cinnabar);
  background: rgba(192, 57, 43, .09);
  color: var(--cinnabar);
  text-decoration: line-through;
  text-decoration-thickness: 1.5px;
}

.page-faq .faq-sec--dark .faq-formula {
  background: rgba(201, 162, 39, .12);
  color: var(--gold-soft);
}

.page-faq .faq-sec--dark .faq-formula--wrong {
  background: rgba(192, 57, 43, .18);
  color: #f0a49b;
}

/* ---------- 顶部锚点条 ---------- */
.page-faq .faq-toc {
  position: sticky;
  top: var(--header-offset);
  z-index: 30;
  background: rgba(8, 37, 31, .94);
  border-top: 1px solid rgba(232, 207, 122, .16);
  border-bottom: 1px solid rgba(232, 207, 122, .16);
  backdrop-filter: blur(10px);
}

.page-faq .faq-toc-inner {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 9px 0;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-faq .faq-toc-inner::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-toc-label {
  flex: 0 0 auto;
  padding-right: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--gold);
}

.page-faq .faq-toc-link {
  flex: 0 0 auto;
  padding: 7px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-size: 14px;
  color: rgba(245, 241, 230, .74);
  text-decoration: none;
  transition: color .2s ease-out, border-color .2s ease-out, background .2s ease-out;
}

.page-faq .faq-toc-link:hover {
  color: var(--gold-soft);
  border-color: rgba(232, 207, 122, .42);
  background: rgba(201, 162, 39, .1);
}

/* ---------- 章节 ---------- */
.page-faq .faq-sec {
  padding-block: clamp(48px, 7.6vw, 92px);
  scroll-margin-top: calc(var(--header-offset) + 74px);
}

.page-faq .faq-sec--paper {
  background: var(--paper);
  color: var(--charcoal);
}

.page-faq .faq-sec--dark {
  background:
    radial-gradient(110% 70% at 12% 0%, rgba(23, 89, 74, .5) 0%, rgba(8, 37, 31, 0) 60%),
    var(--ink-900);
  color: var(--paper);
}

.page-faq .faq-rail {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 8px;
  margin: 0 0 clamp(26px, 3.6vw, 42px);
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--faq-line-strong);
  background: rgba(14, 58, 49, .07);
  transition: background .24s ease-out;
}

.page-faq .faq-sec--dark .faq-rail {
  background: rgba(245, 241, 230, .05);
}

.page-faq .faq-rail-label {
  padding: 0 6px 0 4px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-faq .faq-rail-link {
  display: inline-block;
  padding: 6px 13px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(201, 162, 39, .22);
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--ink-700);
  text-decoration: none;
  transition: background .22s ease-out, border-color .22s ease-out, color .22s ease-out;
}

.page-faq .faq-rail-link:hover {
  background: rgba(201, 162, 39, .18);
  border-color: rgba(201, 162, 39, .5);
  color: var(--ink-900);
}

.page-faq .faq-sec--dark .faq-rail-link {
  border-color: rgba(232, 207, 122, .22);
  color: rgba(245, 241, 230, .76);
}

.page-faq .faq-sec--dark .faq-rail-link:hover {
  background: rgba(201, 162, 39, .2);
  border-color: rgba(232, 207, 122, .55);
  color: var(--paper);
}

.page-faq .faq-sec-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  margin-bottom: 20px;
}

.page-faq .faq-sec-head .section-num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 500;
  line-height: 1;
  color: var(--gold);
}

.page-faq .faq-sec-head .section-title {
  flex: 1 1 12ch;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 3.3vw, 34px);
  line-height: 1.28;
}

.page-faq .faq-count {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 54px;
  height: 54px;
  padding: 0 12px;
  border-radius: 50%;
  border: 1px solid rgba(201, 162, 39, .55);
  background: var(--ink-700);
  color: var(--gold-soft);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .02em;
}

.page-faq .faq-sec-lead {
  flex: 1 0 100%;
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-sec--dark .faq-sec-lead {
  color: rgba(245, 241, 230, .62);
}

.page-faq .faq-list .accordion-item:first-child {
  border-top: 1px solid var(--acc-line);
}

/* ---------- 功能章节：正文＋平板图 ---------- */
.page-faq .faq-usage-grid {
  display: grid;
  gap: clamp(28px, 4vw, 46px);
  align-items: start;
}

.page-faq .faq-usage-media {
  margin: 0;
  border-radius: var(--radius-card);
  border: 1px solid var(--faq-line-strong);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.page-faq .faq-usage-media .media-caption {
  margin: 12px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(245, 241, 230, .6);
}

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

/* ---------- 联系章节 ---------- */
.page-faq .faq-sec--contact {
  padding-bottom: clamp(56px, 8vw, 108px);
}

.page-faq .faq-contact {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

.page-faq .faq-contact-main {
  min-width: 0;
}

.page-faq .faq-contact-main .prose {
  margin: 0 0 24px;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--acc-body);
}

.page-faq .faq-need-list {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .faq-need-item {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--acc-body);
}


.page-faq .faq-need-num {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--gold);
}

.page-faq .faq-contact-route {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--acc-body);
}

.page-faq .faq-contact-route a {
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid var(--faq-line-strong);
}

.page-faq .faq-contact-route a:hover {
  color: var(--gold-soft);
}

.page-faq .faq-contact-card {
  padding: clamp(22px, 3vw, 34px);
  border: 1px solid var(--faq-line-strong);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
}

.page-faq .faq-contact-label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-faq .faq-contact-mail {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: clamp(15px, 2.4vw, 19px);
  line-height: 1.5;
  color: var(--paper);
  word-break: break-all;
}

.page-faq .faq-contact-note {
  margin: 0 0 22px;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(245, 241, 230, .72);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-usage-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero-shell {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    gap: clamp(38px, 5vw, 68px);
  }

  .page-faq .faq-hero-aside {
    padding-top: clamp(30px, 4vw, 56px);
  }

  .page-faq .faq-contact {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  }

  .page-faq .accordion-trigger {
    padding-left: 24px;
  }

  .page-faq .accordion-panel {
    padding-left: 24px;
    padding-right: 40px;
  }
}

@media (min-width: 1120px) {
  .page-faq .faq-h1 {
    max-width: 17ch;
  }

  .page-faq .faq-hero-shell {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .accordion-item::before,
  .page-faq .accordion-icon::after,
  .page-faq .accordion-trigger,
  .page-faq .faq-toc-link,
  .page-faq .faq-rail-link {
    transition: none;
  }
}