.page-faq {
  --faq-measure: 68ch;
  --faq-radius: 6px;
  padding-bottom: 88px;
}

.page-faq .breadcrumbs {
  padding-top: 28px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: 40px 0 56px;
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  left: -10%;
  right: -10%;
  top: -60%;
  height: 560px;
  background:
    radial-gradient(58% 58% at 28% 62%, rgba(122, 60, 255, .34), transparent 70%),
    radial-gradient(48% 48% at 76% 46%, rgba(37, 225, 214, .2), transparent 72%);
  pointer-events: none;
  z-index: 0;
}

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

.page-faq .faq-hero__eyebrow {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-faq h1 {
  margin: 0 0 22px;
  max-width: 17ch;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(34px, 6.4vw, 84px);
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-faq .faq-hero__lead {
  max-width: 62ch;
  margin: 0 0 28px;
  font-size: 17px;
  line-height: 1.75;
  color: var(--muted);
}

.page-faq .faq-hero__meta {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--white);
}

.page-faq .faq-hero__meta li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-faq .faq-dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--neon);
  box-shadow: 0 0 10px rgba(242, 255, 77, .45);
}

/* ---------- 主体双栏 ---------- */
.page-faq .faq-body {
  display: block;
}

.page-faq .faq-rail {
  margin-bottom: 44px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 10px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

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

.page-faq .faq-node {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--muted);
  font-size: 14px;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  transition: color .18s var(--ease), border-color .18s var(--ease),
    background-color .18s var(--ease), transform .18s var(--ease);
}

.page-faq .faq-node:hover,
.page-faq .faq-node:focus-visible {
  color: var(--white);
  border-color: var(--cyan);
  background: rgba(37, 225, 214, .08);
}

.page-faq .faq-node__num {
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--cyan);
}

.page-faq .faq-node__dot {
  display: none;
}

.page-faq .faq-main {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 72px;
}

/* ---------- 章节 ---------- */
.page-faq .faq-section {
  scroll-margin-top: 84px;
}

.page-faq .faq-section__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 14px;
}

.page-faq .faq-section__num {
  flex: none;
  padding: 3px 8px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--panel);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--cyan);
}

.page-faq .faq-section__title {
  margin: 0;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(24px, 4vw, 40px);
  line-height: 1.15;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-faq .faq-section__lead {
  max-width: 62ch;
  margin: 0 0 26px;
  font-size: 17px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 插图 ---------- */
.page-faq .faq-figure {
  margin: 0 0 30px;
  border: 1px solid var(--line);
  border-radius: var(--faq-radius);
  background: var(--panel);
  overflow: hidden;
  box-shadow: var(--shadow);
}

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

.page-faq .faq-figure figcaption {
  padding: 12px 18px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 安装步骤 ---------- */
.page-faq .faq-steps {
  list-style: none;
  margin: 0 0 32px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .faq-step {
  position: relative;
  padding: 20px 20px 22px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--violet);
  border-radius: var(--faq-radius);
  background: var(--panel);
  transition: border-color .2s var(--ease), transform .2s var(--ease);
}

.page-faq .faq-step:hover {
  border-color: var(--cyan);
  border-top-color: var(--cyan);
  transform: translateY(-4px);
}

.page-faq .faq-step__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-faq .faq-step__title {
  margin: 0 0 8px;
  font-family: var(--font-title);
  font-size: 19px;
  font-weight: 700;
  color: var(--white);
}

.page-faq .faq-step__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 档位卡 ---------- */
.page-faq .faq-tiers {
  display: grid;
  gap: 12px;
  margin: 0 0 30px;
}

.page-faq .faq-tier {
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--faq-radius);
  background: var(--panel);
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease),
    transform .2s var(--ease);
}

.page-faq .faq-tier:hover {
  border-color: var(--cyan);
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}

.page-faq .faq-tier__spec {
  margin: 14px 0 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--white);
}

.page-faq .faq-tier__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 问答手风琴 ---------- */
.page-faq .qa-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-faq .qa {
  border: 1px solid var(--line);
  border-left: 3px solid var(--line);
  border-radius: var(--faq-radius);
  background: var(--panel);
  transition: border-color .2s var(--ease), transform .2s var(--ease),
    background-color .2s var(--ease);
}

.page-faq .qa:hover {
  border-color: var(--cyan);
  border-left-color: var(--cyan);
  transform: translateY(-2px);
}

.page-faq .qa[open] {
  border-left-color: var(--cyan);
  background-image: linear-gradient(90deg, rgba(37, 225, 214, .08), transparent 42%);
}

.page-faq .qa__q {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 17px 20px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-title);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--white);
  transition: color .18s var(--ease);
}

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

.page-faq .qa__q::after {
  content: "+";
  margin-left: auto;
  flex: none;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--cyan);
}

.page-faq .qa[open] .qa__q::after {
  content: "–";
}

.page-faq .qa__q:hover {
  color: var(--cyan);
}

.page-faq .qa__a {
  max-width: var(--faq-measure);
  padding: 0 20px 20px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--muted);
}

.page-faq .qa__a p {
  margin: 0;
}

.page-faq .qa__a p + p {
  margin-top: 10px;
}

.page-faq .qa__steps {
  margin: 0;
  padding-left: 22px;
  display: grid;
  gap: 8px;
}

.page-faq .qa__steps li {
  line-height: 1.7;
}

/* ---------- 客服与延伸链接 ---------- */
.page-faq .faq-contact {
  padding: 34px 24px 30px;
}

.page-faq .faq-contact__title {
  margin: 12px 0;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1.2;
  color: var(--white);
}

.page-faq .faq-contact__lead {
  max-width: 60ch;
  margin: 0 0 22px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--muted);
}

.page-faq .faq-contact__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}

.page-faq .faq-contact__line {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--white);
  overflow-wrap: anywhere;
}

.page-faq .faq-contact__note {
  margin: 4px 0 0;
  font-size: 13px;
  line-height: 1.7;
}

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

.page-faq .faq-links li {
  padding-left: 14px;
  border-left: 2px solid var(--line);
  transition: border-color .18s var(--ease);
}

.page-faq .faq-links li:hover {
  border-left-color: var(--cyan);
}

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

  .page-faq .faq-contact {
    padding: 40px 34px 34px;
  }
}

@media (min-width: 720px) {
  .page-faq .faq-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 1024px) {
  .page-faq .faq-hero {
    padding: 64px 0 72px;
  }

  .page-faq .faq-body {
    display: grid;
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 64px;
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 100px;
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: 0;
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding: 0 0 0 26px;
    position: relative;
  }

  .page-faq .faq-rail__list::before {
    content: "";
    position: absolute;
    left: 9px;
    top: 14px;
    bottom: 14px;
    width: 2px;
    border-radius: 2px;
    background: linear-gradient(180deg, var(--violet) 0%, var(--cyan) 100%);
    opacity: .55;
  }

  .page-faq .faq-node {
    display: flex;
    padding: 10px 14px;
    border-color: transparent;
    border-radius: 8px;
    background: transparent;
  }

  .page-faq .faq-node:hover,
  .page-faq .faq-node:focus-visible {
    background: rgba(37, 225, 214, .08);
    transform: translateX(2px);
  }

  .page-faq .faq-node__dot {
    display: block;
    position: absolute;
    left: -21px;
    top: 50%;
    width: 10px;
    height: 10px;
    margin-top: -5px;
    border-radius: 50%;
    background: var(--line);
    box-shadow: 0 0 0 3px var(--ink);
    transition: background-color .18s var(--ease), box-shadow .18s var(--ease);
  }

  .page-faq .faq-node:hover .faq-node__dot,
  .page-faq .faq-node:focus-visible .faq-node__dot {
    background: var(--cyan);
    box-shadow: 0 0 0 3px var(--ink), 0 0 12px rgba(37, 225, 214, .75);
  }

  .page-faq .faq-section {
    scroll-margin-top: 100px;
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-body {
    grid-template-columns: 236px minmax(0, 1fr);
    gap: 80px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .faq-tier,
  .page-faq .faq-step,
  .page-faq .faq-node,
  .page-faq .faq-links li {
    transition: none;
  }

  .page-faq .qa:hover,
  .page-faq .faq-tier:hover,
  .page-faq .faq-step:hover,
  .page-faq .faq-node:hover {
    transform: none;
  }
}