.page-faq {
  background: var(--ink-900);
  color: var(--stone);
  --faq-side: 250px;
}

.page-faq .eyebrow {
  margin: 0;
}

/* ---------- 首屏 ---------- */
.faq-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink-900);
  border-bottom: 1px solid var(--line-strong);
  padding: clamp(26px, 5vw, 52px) 0 clamp(34px, 7vw, 68px);
}

.faq-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.faq-hero__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.34;
  filter: saturate(0.62) contrast(1.05);
}

.faq-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 90% at 18% 0%, rgba(15, 42, 34, 0.5), transparent 62%),
    linear-gradient(180deg, rgba(11, 18, 16, 0.6) 0%, rgba(11, 18, 16, 0.9) 62%, var(--ink-900) 100%);
}

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

.faq-hero .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.faq-hero .breadcrumb__item {
  color: var(--stone);
}

.faq-hero .breadcrumb__item a {
  color: var(--stone);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.faq-hero .breadcrumb__item a:hover,
.faq-hero .breadcrumb__item a:focus-visible {
  color: var(--lime);
  border-color: var(--lime);
}

.faq-hero .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 6px;
  color: var(--hairline);
}

.faq-hero .breadcrumb__item[aria-current="page"] {
  color: var(--paper);
}

.faq-hero .eyebrow {
  margin-top: clamp(20px, 4vw, 34px);
}

.faq-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 7.8vw, 68px);
  line-height: 1.04;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 14px 0 0;
  max-width: 20ch;
  overflow-wrap: break-word;
}

.faq-hero__title em {
  font-style: normal;
  color: var(--lime);
  box-shadow: inset 0 -0.14em 0 rgba(200, 255, 61, 0.24);
}

.faq-hero__lead {
  max-width: 54ch;
  margin: 18px 0 0;
  font-size: clamp(14px, 2.6vw, 17px);
  line-height: 1.85;
  color: var(--stone);
}

/* ---------- 分类索引 ---------- */
.faq-index {
  background: var(--ink-800);
  border-bottom: 1px solid var(--line-soft);
  padding: clamp(30px, 6vw, 56px) 0;
}

.faq-index__head {
  display: grid;
  gap: 10px;
  max-width: 60ch;
}

.faq-index h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 4.4vw, 34px);
  line-height: 1.15;
  color: var(--paper);
  margin: 0;
}

.faq-index__lead {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--stone);
}

.faq-index__list {
  list-style: none;
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  min-height: 44px;
  padding: 14px 16px;
  background: var(--ink-900);
  border-left: 2px solid transparent;
  text-decoration: none;
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.faq-index__link:hover,
.faq-index__link:focus-visible {
  background: var(--ink-800);
  border-left-color: var(--lime);
}

.faq-index__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--hairline);
  flex: none;
  transition: color 0.2s var(--ease);
}

.faq-index__link:hover .faq-index__num,
.faq-index__link:focus-visible .faq-index__num {
  color: var(--lime);
}

.faq-index__name {
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
}

.faq-index__meta {
  margin-left: auto;
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--stone);
}

/* ---------- 主体布局 ---------- */
.faq-layout {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  padding: clamp(30px, 5vw, 60px) 0;
}

.faq-aside__panel {
  border: 1px solid var(--line-strong);
  background: var(--ink-800);
  padding: 16px 18px;
}

.faq-aside__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--lime);
}

.faq-aside__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.faq-aside__link {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(94, 107, 98, 0.3);
  color: var(--paper);
  font-size: 14px;
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.faq-aside__list li:last-child .faq-aside__link {
  border-bottom: 0;
}

.faq-aside__link span:last-child {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--hairline);
}

.faq-aside__link:hover,
.faq-aside__link:focus-visible {
  color: var(--lime);
}

.faq-aside__note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid rgba(94, 107, 98, 0.3);
  font-size: 12px;
  line-height: 1.75;
  color: var(--stone);
}

.faq-body {
  min-width: 0;
  display: grid;
  gap: clamp(30px, 5vw, 54px);
}

/* ---------- 问答分组 ---------- */
.faq-group {
  scroll-margin-top: 24px;
}

.faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-strong);
}

.faq-group__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ember);
  flex: none;
}

.faq-group__head h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 4vw, 30px);
  line-height: 1.2;
  color: var(--paper);
  margin: 0;
}

.faq-group__intro {
  margin: 12px 0 4px;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--stone);
}

/* ---------- 手风琴 ---------- */
.qa {
  border-bottom: 1px solid var(--line-soft);
}

.qa__q {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  min-height: 44px;
  padding: 15px 0;
  cursor: pointer;
  list-style: none;
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--paper);
  transition: color 0.2s var(--ease);
}

.qa__q::-webkit-details-marker {
  display: none;
}

.qa__q::marker {
  content: "";
}

.qa__q:hover,
.qa__q:focus-visible {
  color: var(--lime);
}

.qa__q:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

.qa__mark {
  flex: none;
  margin-top: 3px;
  padding: 4px 5px;
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1;
  color: var(--lime);
}

.qa__q-text {
  flex: 1;
  min-width: 0;
}

.qa__q::after {
  content: "+";
  flex: none;
  margin-left: 8px;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--stone);
  transition: color 0.2s var(--ease);
}

.qa[open] .qa__q {
  color: var(--lime);
}

.qa[open] .qa__q::after {
  content: "–";
  color: var(--lime);
}

.qa__a {
  padding: 0 0 18px 26px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--stone);
}

.qa__a p {
  margin: 0 0 10px;
}

.qa__a p:last-child {
  margin-bottom: 0;
}

.qa__a a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 步骤编号 */
.qa-steps {
  list-style: none;
  counter-reset: step;
  margin: 10px 0 12px;
  padding: 0;
  display: grid;
  gap: 8px;
}

.qa-steps li {
  counter-increment: step;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
  align-items: baseline;
}

.qa-steps li::before {
  content: counter(step, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ember);
}

/* 章节配图 */
.qa-figure {
  margin: 20px 0 0;
  border: 1px solid var(--line-soft);
  background: var(--ink-800);
}

.qa-figure__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.qa-figure__cap {
  padding: 10px 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 12px;
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 联系卡片 ---------- */
.faq-contact {
  background: var(--ink-800);
  border-top: 1px solid var(--line-strong);
  padding: clamp(32px, 6vw, 64px) 0;
}

.faq-contact__grid {
  display: grid;
  gap: 24px;
}

.faq-contact h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 4.2vw, 34px);
  line-height: 1.15;
  color: var(--paper);
  margin: 12px 0;
}

.faq-contact__text {
  margin: 0 0 18px;
  max-width: 46ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--stone);
}

.faq-contact__rows {
  border-top: 1px solid var(--line-strong);
}

.faq-contact__row {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 10px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-soft);
}

.faq-contact__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--hairline);
  padding-top: 3px;
}

.faq-contact__val {
  font-size: 15px;
  color: var(--paper);
  overflow-wrap: break-word;
}

.faq-contact__val a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 255, 61, 0.4);
}

.faq-contact__val a:hover {
  border-bottom-color: var(--lime);
}

.faq-top {
  margin: 26px 0 0;
}

.faq-top a {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--stone);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 2px;
}

.faq-top a:hover,
.faq-top a:focus-visible {
  color: var(--lime);
  border-color: var(--lime);
}

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

  .qa__q {
    font-size: 16px;
  }

  .qa__a {
    padding-left: 34px;
    font-size: 15px;
  }

  .qa-figure {
    max-width: 420px;
  }
}

@media (min-width: 940px) {
  .faq-layout {
    grid-template-columns: var(--faq-side) minmax(0, 1fr);
    align-items: start;
  }

  .faq-aside__panel {
    position: sticky;
    top: 24px;
  }

  .faq-index__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .faq-contact__grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 44px;
    align-items: start;
  }
}

@media (min-width: 1180px) {
  .faq-hero__lead {
    font-size: 17px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}