.page-faq {
  --faq-rail-w: 296px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-top: clamp(28px, 6vw, 64px);
  padding-bottom: clamp(46px, 7vw, 88px);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -140px;
  bottom: -180px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(87, 214, 178, 0.3), transparent 68%);
  pointer-events: none;
}

.page-faq .faq-hero .container {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero .breadcrumb {
  margin-bottom: clamp(22px, 4vw, 40px);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  align-items: center;
}

.page-faq .faq-hero__text h1 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2rem, 5.4vw, 3.6rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--porcelain);
}

.page-faq .faq-hero__lede {
  margin-top: 20px;
  max-width: 46em;
  font-size: clamp(0.98rem, 1.3vw, 1.1rem);
  line-height: 1.85;
  color: var(--mist);
}

.page-faq .faq-hero__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 32px 0 0;
  padding-top: 24px;
  border-top: 1px solid var(--line-dark);
}

.page-faq .faq-hero__stats > div {
  display: grid;
  gap: 4px;
}

.page-faq .faq-hero__stats dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--celadon);
}

.page-faq .faq-hero__stats dd {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--porcelain);
}

.page-faq .faq-hero__stats dd span {
  display: block;
  margin-top: 2px;
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 0.82rem;
  letter-spacing: 0;
  color: var(--mist);
}

.page-faq .faq-hero__diagram {
  width: 100%;
  max-width: 340px;
  height: auto;
  margin: 0 auto;
  color: var(--mist);
  opacity: 0.95;
}

.page-faq .faq-hero__diagram .dg-list {
  color: var(--celadon);
}

.page-faq .faq-hero__diagram .dg-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  opacity: 0.7;
}

/* ---------- 主体布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-faq .faq-rail__inner {
  background: var(--indigo-950);
  border-radius: var(--radius-l);
  padding: clamp(20px, 3vw, 26px);
  color: var(--porcelain);
}

.page-faq .faq-rail__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 1.12rem;
  letter-spacing: -0.01em;
  color: var(--porcelain);
}

.page-faq .faq-rail__hint {
  margin: 6px 0 16px;
  font-size: 0.84rem;
  line-height: 1.6;
  color: var(--mist);
}

.page-faq .faq-filters {
  display: flex;
  flex-wrap: nowrap;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-filters .filter-btn {
  flex: 0 0 auto;
  padding: 9px 15px;
  border: 1px solid var(--line-dark);
  border-radius: 999px;
  background: transparent;
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  line-height: 1.4;
  white-space: nowrap;
  cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-filters .filter-btn:hover {
  border-color: var(--celadon);
  color: var(--porcelain);
}

.page-faq .faq-filters .filter-btn[aria-pressed="true"] {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--ink);
}

.page-faq .faq-filters .filter-btn:focus-visible {
  outline: 2px solid var(--signal-soft);
  outline-offset: 2px;
}

.page-faq .faq-rail__tools {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--line-dark);
}

.page-faq .faq-rail .btn--ghost {
  border-color: var(--line-dark);
  color: var(--porcelain);
}

/* ---------- 步骤折叠 ---------- */
.page-faq .faq-main {
  min-width: 0;
}

.page-faq .faq-item {
  margin-bottom: 14px;
  border: 1px solid var(--line-light);
  border-radius: var(--radius-m);
  background: var(--paper, #fff);
  color: var(--ink);
  overflow: hidden;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-faq .faq-item[hidden] {
  display: none;
}

.page-faq .faq-item:hover {
  border-color: rgba(31, 143, 122, 0.45);
}

.page-faq .faq-item[open] {
  border-color: rgba(31, 143, 122, 0.55);
  box-shadow: 0 14px 34px rgba(11, 21, 51, 0.08);
}

.page-faq .faq-item__summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 16px clamp(14px, 3vw, 24px);
  list-style: none;
  cursor: pointer;
}

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

.page-faq .faq-item__summary:focus-visible {
  outline: 2px solid var(--celadon-deep);
  outline-offset: -4px;
}

.page-faq .faq-item[open] .faq-item__summary {
  border-bottom: 1px solid var(--line-light);
}

.page-faq .faq-item__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--signal);
}

.page-faq .faq-item__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1rem, 1.8vw, 1.14rem);
  letter-spacing: -0.01em;
  line-height: 1.4;
}

.page-faq .faq-item__cue {
  position: relative;
  width: 26px;
  height: 26px;
  border: 1px solid var(--line-light);
  border-radius: 50%;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .faq-item__cue::before,
.page-faq .faq-item__cue::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 11px;
  height: 1.5px;
  background: var(--celadon-deep);
  transform: translate(-50%, -50%);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.page-faq .faq-item__cue::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.page-faq .faq-item[open] .faq-item__cue {
  background: var(--celadon);
  border-color: var(--celadon);
}

.page-faq .faq-item[open] .faq-item__cue::after {
  opacity: 0;
}

.page-faq .faq-item__body {
  padding: 4px clamp(14px, 3vw, 24px) clamp(18px, 3vw, 26px);
}

.page-faq .faq-item__lead {
  margin: 14px 0 18px;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--ink);
}

.page-faq .faq-steps {
  counter-reset: faqstep;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .faq-steps > li {
  counter-increment: faqstep;
  display: grid;
  grid-template-columns: 24px 1fr;
  gap: 12px;
  align-items: start;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--ink);
}

.page-faq .faq-steps > li::before {
  content: counter(faqstep, decimal-leading-zero);
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  margin-top: 3px;
  border: 1px solid rgba(255, 107, 44, 0.5);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0;
  color: var(--signal);
}

.page-faq .faq-note {
  margin: 18px 0 0;
  padding: 12px 16px;
  border-left: 3px solid var(--celadon);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  background: rgba(87, 214, 178, 0.13);
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--ink);
}

.page-faq .faq-figure {
  margin: 22px 0 0;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line-light);
  border-radius: var(--radius-m);
  object-fit: cover;
}

.page-faq .faq-figure figcaption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--celadon-deep);
}

.page-faq .faq-next {
  margin: 20px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line-light);
  font-size: 0.92rem;
}

.page-faq .faq-next a {
  color: var(--indigo-700);
  text-decoration: underline;
  text-decoration-color: var(--signal);
  text-underline-offset: 4px;
  text-decoration-thickness: 2px;
}

.page-faq .faq-next a::after {
  content: " →";
  color: var(--signal);
}

.page-faq .filter-empty {
  margin: 8px 0 0;
  padding: 20px;
  border: 1px dashed var(--line-light);
  border-radius: var(--radius-m);
  font-size: 0.92rem;
  color: var(--ink);
}

/* ---------- 未解决时 ---------- */
.page-faq .faq-help {
  margin-top: clamp(24px, 4vw, 36px);
  padding: clamp(22px, 4vw, 38px);
  border-radius: var(--radius-l);
  background: var(--indigo-850);
  color: var(--porcelain);
  display: grid;
  gap: clamp(22px, 3vw, 34px);
}

.page-faq .faq-help h2 {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.35rem, 2.6vw, 1.85rem);
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--porcelain);
}

.page-faq .faq-help__lede {
  margin: 12px 0 0;
  max-width: 40em;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-help__list {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-faq .faq-help__list li {
  position: relative;
  padding-left: 18px;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--porcelain);
}

.page-faq .faq-help__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--celadon);
}

.page-faq .faq-help__contact {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 2;
  letter-spacing: 0.03em;
  color: var(--mist);
  word-break: break-word;
}

.page-faq .faq-help__contact a {
  color: var(--porcelain);
  text-decoration: underline;
  text-decoration-color: var(--signal);
  text-underline-offset: 3px;
}

.page-faq .faq-help .btn--signal {
  color: var(--ink);
}

/* ---------- 断点 ---------- */
@media (min-width: 560px) {
  .page-faq .faq-hero__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (min-width: 880px) {
  .page-faq .faq-help {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: start;
  }
}

@media (min-width: 980px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1fr) 340px;
  }
}

@media (min-width: 1040px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    align-items: start;
  }

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

  .page-faq .faq-filters {
    flex-direction: column;
    flex-wrap: nowrap;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-filters .filter-btn {
    width: 100%;
    text-align: left;
    border-radius: var(--radius-s);
    white-space: normal;
  }

  .page-faq .faq-item__summary {
    padding: 20px 26px;
  }

  .page-faq .faq-item__body {
    padding: 4px 26px 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-item__cue,
  .page-faq .faq-item__cue::before,
  .page-faq .faq-item__cue::after,
  .page-faq .faq-filters .filter-btn {
    transition: none;
  }
}