.page-faq {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.75;
}

.page-faq a {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(49, 224, 214, 0.35);
  transition: color var(--dur) var(--ease-out), border-color var(--dur) var(--ease-out);
}

.page-faq a:hover,
.page-faq a:focus-visible {
  color: var(--amber-300);
  border-bottom-color: var(--amber-500);
}

.page-faq a:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 56px) 0 56px;
  background: var(--ink-900);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero__img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.4;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(115% 85% at 82% 10%, rgba(49, 224, 214, 0.18), transparent 58%),
    linear-gradient(180deg, rgba(11, 11, 15, 0.6) 0%, rgba(11, 11, 15, 0.88) 60%, var(--ink-900) 100%);
  pointer-events: none;
}

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

.page-faq .faq-hero .breadcrumbs {
  margin-bottom: 26px;
}

.page-faq .faq-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(30px, 5.6vw, 62px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  font-weight: 700;
  max-width: 22ch;
}

.page-faq .faq-hero__lead {
  margin: 22px 0 0;
  max-width: 56ch;
  color: var(--text-dim);
  font-size: var(--fs-16);
  line-height: 1.8;
}

.page-faq .faq-hero__stats {
  list-style: none;
  margin: 34px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  max-width: 620px;
}

.page-faq .faq-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-faq .faq-hero__num {
  font-family: var(--font-mono);
  font-size: var(--fs-24);
  letter-spacing: 0.04em;
  color: var(--amber-500);
  line-height: 1.1;
}

.page-faq .faq-hero__label {
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--text-faint);
}

/* ---------- 速查面板 ---------- */

.page-faq .faq-quick {
  margin-top: 48px;
}

.page-faq .faq-quick__panel {
  position: relative;
  padding: clamp(20px, 3.4vw, 38px);
  border: 1px solid var(--line);
  border-radius: 4px;
  background:
    radial-gradient(90% 130% at 8% 0%, rgba(139, 92, 246, 0.16), transparent 62%),
    linear-gradient(160deg, var(--ink-700), var(--ink-800));
}

.page-faq .faq-quick__panel::before,
.page-faq .faq-quick__panel::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  border: 1px solid var(--amber-500);
  opacity: 0.75;
}

.page-faq .faq-quick__panel::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-faq .faq-quick__panel::after {
  bottom: -1px;
  right: -1px;
  border-left: 0;
  border-top: 0;
}

.page-faq .faq-quick__head h2 {
  margin: 10px 0 0;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  font-weight: 700;
}

.page-faq .faq-quick__sub {
  margin: 12px 0 0;
  color: var(--text-dim);
  font-size: var(--fs-14);
  max-width: 46ch;
}

.page-faq .faq-quick__list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
  grid-template-columns: 1fr;
}

.page-faq .faq-quick__link {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  min-height: 48px;
  padding: 13px 14px;
  border: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft) !important;
  border-radius: 3px;
  background: rgba(11, 11, 15, 0.55);
  color: var(--text);
  font-size: var(--fs-14);
  line-height: 1.5;
  transition: border-color var(--dur) var(--ease-out), background var(--dur) var(--ease-out), transform var(--dur) var(--ease-out);
}

.page-faq .faq-quick__link:hover,
.page-faq .faq-quick__link:focus-visible {
  color: var(--text);
  border-color: var(--amber-500) !important;
  background: rgba(28, 28, 40, 0.9);
  transform: translateX(3px);
}

.page-faq .faq-quick__no {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--cyan-400);
  letter-spacing: 0.08em;
  padding-top: 2px;
}

/* ---------- 主体两栏 ---------- */

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-top: 64px;
  padding-bottom: 96px;
}

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

.page-faq .faq-aside__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber-500);
}

.page-faq .faq-aside__nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}

.page-faq .faq-aside__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 9px 14px;
  border: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft) !important;
  border-radius: 999px;
  color: var(--text-dim);
  font-size: var(--fs-14);
  white-space: nowrap;
  background: var(--ink-800);
  transition: color var(--dur) var(--ease-out), border-color var(--dur) var(--ease-out), background var(--dur) var(--ease-out);
}

.page-faq .faq-aside__link .mono-num {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--cyan-400);
}

.page-faq .faq-aside__link:hover,
.page-faq .faq-aside__link:focus-visible {
  color: var(--text);
  border-color: var(--amber-500) !important;
  background: var(--ink-700);
}

.page-faq .faq-aside__note {
  display: none;
  margin: 22px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--line-soft);
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--text-faint);
}

.page-faq .faq-stream {
  min-width: 0;
}

/* ---------- 章节 ---------- */

.page-faq .faq-chapter {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-faq .faq-chapter + .faq-chapter {
  margin-top: 68px;
  padding-top: 48px;
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-chapter__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  color: var(--amber-500);
}

.page-faq .faq-chapter h2 {
  margin: 10px 0 0;
  font-size: clamp(23px, 3.4vw, 36px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  font-weight: 700;
}

.page-faq .faq-chapter__lead {
  margin: 20px 0 26px;
  padding-left: 16px;
  border-left: 2px solid var(--amber-500);
  max-width: 48ch;
  color: var(--text-dim);
  font-size: var(--fs-14);
  line-height: 1.85;
}

/* ---------- 手风琴 ---------- */

.page-faq .faq-item {
  margin-bottom: 10px;
  border: 1px solid var(--line-soft);
  border-radius: 3px;
  background: var(--surface);
  scroll-margin-top: calc(var(--header-h) + 24px);
  transition: border-color var(--dur) var(--ease-out), background var(--dur) var(--ease-out), box-shadow var(--dur) var(--ease-out);
}

.page-faq .faq-item[open] {
  border-color: rgba(242, 163, 58, 0.5);
  background: var(--ink-700);
}

.page-faq .faq-item:target {
  border-color: var(--cyan-400);
  box-shadow: 0 0 0 1px rgba(49, 224, 214, 0.4);
}

.page-faq .faq-item summary {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  min-height: 52px;
  padding: 15px 16px;
  list-style: none;
  cursor: pointer;
  font-size: var(--fs-16);
  font-weight: 600;
  line-height: 1.5;
  color: var(--text);
}

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

.page-faq .faq-item summary::marker {
  content: "";
}

.page-faq .faq-item summary::after {
  content: "+";
  flex: 0 0 auto;
  padding-top: 1px;
  font-family: var(--font-mono);
  font-size: var(--fs-19);
  line-height: 1.1;
  color: var(--amber-500);
  transition: color var(--dur) var(--ease-out);
}

.page-faq .faq-item[open] summary::after {
  content: "−";
  color: var(--cyan-400);
}

.page-faq .faq-item summary:hover {
  color: var(--cream-100);
}

.page-faq .faq-item summary:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: -2px;
}

.page-faq .faq-answer {
  padding: 2px 16px 20px;
  color: var(--text-dim);
  font-size: var(--fs-14);
  line-height: 1.85;
}

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

.page-faq .faq-steps li {
  counter-increment: faq-step;
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
}

.page-faq .faq-steps li::before {
  content: counter(faq-step, decimal-leading-zero);
  display: grid;
  place-items: center;
  height: 22px;
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--cyan-400);
  border: 1px solid rgba(49, 224, 214, 0.42);
  border-radius: 2px;
}

.page-faq .faq-note {
  margin: 14px 0 0;
  padding: 11px 13px;
  border-left: 2px solid var(--cyan-700);
  border-radius: 0 3px 3px 0;
  background: rgba(14, 127, 122, 0.16);
  color: var(--text);
  font-size: var(--fs-12);
  line-height: 1.7;
}

/* ---------- 章节配图 ---------- */

.page-faq .faq-figure {
  margin: 26px 0 0;
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
  background: var(--ink-800);
}

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

.page-faq .faq-figure figcaption {
  padding: 11px 14px;
  border-top: 1px solid var(--line-soft);
  font-size: var(--fs-12);
  letter-spacing: 0.03em;
  color: var(--text-faint);
}

/* ---------- 联系支持 ---------- */

.page-faq .faq-chapter--contact {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-faq .faq-contact {
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--line);
  border-radius: 5px;
  background:
    radial-gradient(95% 120% at 92% 0%, rgba(49, 224, 214, 0.16), transparent 62%),
    linear-gradient(150deg, var(--ink-700), var(--ink-800));
  display: grid;
  gap: 22px;
}

.page-faq .faq-contact__body p {
  margin: 0 0 12px;
  color: var(--text-dim);
  font-size: var(--fs-14);
  line-height: 1.85;
}

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

.page-faq .faq-contact__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border: 1px solid var(--line-soft);
  border-radius: 3px;
  overflow: hidden;
  background: var(--line-soft);
}

.page-faq .faq-contact__list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding: 12px 14px;
  background: var(--ink-900);
}

.page-faq .faq-contact__key {
  flex: 0 0 auto;
  min-width: 68px;
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--text-faint);
}

.page-faq .faq-contact__val {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  letter-spacing: 0.02em;
  color: var(--amber-300);
  word-break: break-all;
}

.page-faq .faq-contact__cta {
  justify-self: start;
}

/* ---------- 响应式 ---------- */

@media (min-width: 600px) {
  .page-faq .faq-quick__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-faq .faq-contact__cta {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    padding: calc(var(--header-h) + 84px) 0 76px;
  }

  .page-faq .faq-quick {
    margin-top: 64px;
  }

  .page-faq .faq-quick__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
  }

  .page-faq .faq-layout {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: 56px;
    margin-top: 84px;
  }

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

  .page-faq .faq-aside__nav {
    flex-direction: column;
    overflow: visible;
    gap: 2px;
    padding-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-faq .faq-aside__link {
    border: 0 !important;
    border-radius: 0;
    background: transparent;
    padding: 10px 14px;
    min-height: 44px;
    margin-left: -1px;
    border-left: 2px solid transparent !important;
  }

  .page-faq .faq-aside__link:hover,
  .page-faq .faq-aside__link:focus-visible {
    background: rgba(28, 28, 40, 0.75);
    border-left-color: var(--amber-500) !important;
    transform: none;
  }

  .page-faq .faq-aside__note {
    display: block;
  }

  .page-faq .faq-item summary {
    padding: 17px 20px;
    font-size: var(--fs-16);
  }

  .page-faq .faq-answer {
    padding: 4px 20px 22px;
    font-size: var(--fs-16);
  }

  .page-faq .faq-chapter__lead {
    font-size: var(--fs-16);
  }
}

@media (min-width: 1120px) {
  .page-faq .faq-contact {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: 30px;
  }

  .page-faq .faq-contact__cta {
    grid-column: 2;
    justify-self: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-quick__link,
  .page-faq .faq-aside__link,
  .page-faq .faq-item,
  .page-faq .faq-item summary::after {
    transition: none;
  }

  .page-faq .faq-quick__link:hover,
  .page-faq .faq-quick__link:focus-visible {
    transform: none;
  }
}