.page-faq {
  --faq-rail: 300px;
  --faq-block-gap: 44px;
  display: block;
  background: var(--deep);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  padding-bottom: 64px;
}

.page-faq .breadcrumb {
  padding: 20px 0 0;
}

.page-faq .breadcrumb-current {
  color: var(--ink-dim);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: 36px 0 40px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -1px;
  width: 96px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan));
}

.page-faq .faq-hero h1 {
  margin: 14px 0 18px;
  font-size: clamp(30px, 6.4vw, 54px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--white);
  max-width: 22ch;
}

.page-faq .faq-hero .lead {
  max-width: 68ch;
  color: var(--cyan-soft);
  font-size: 16px;
  line-height: 1.8;
}

.page-faq .hero-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 30px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-faq .metric {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 14px 16px;
  background: var(--panel);
}

.page-faq .metric .data-mono {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0.02em;
  color: var(--orange);
}

.page-faq .metric span:last-child {
  font-size: 13px;
  color: var(--ink-dim);
}

/* ---------- 主布局 ---------- */
.page-faq .guide-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  padding: 40px 0 0;
}

/* ---------- 左栏吸顶步骤导航 ---------- */
.page-faq .step-rail {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 18px 16px;
}

.page-faq .rail-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

.page-faq .step-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 4px;
}

.page-faq .step-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 12px;
  border-left: 2px solid var(--line);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--ink-dim);
  text-decoration: none;
  font-size: 15px;
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}

.page-faq .step-no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--orange);
  flex: none;
}

.page-faq .step-name {
  flex: 1 1 auto;
}

.page-faq .step-chev {
  width: 12px;
  height: 12px;
  flex: none;
  color: var(--cyan);
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity var(--ease), transform var(--ease);
}

.page-faq .step-link:hover,
.page-faq .step-link:focus-visible {
  color: var(--white);
  border-left-color: var(--orange);
  background: rgba(255, 107, 53, 0.08);
}

.page-faq .step-link:hover .step-chev,
.page-faq .step-link:focus-visible .step-chev {
  opacity: 1;
  transform: translateX(0);
}

/* ---------- 右栏步骤详解 ---------- */
.page-faq .step-body {
  min-width: 0;
}

.page-faq .step-block {
  padding-bottom: var(--faq-block-gap);
  margin-bottom: var(--faq-block-gap);
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 96px;
}

.page-faq .step-block:last-child {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.page-faq .step-tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-faq .step-block h2 {
  margin: 8px 0 16px;
  font-size: clamp(23px, 3.6vw, 32px);
  font-weight: 900;
  line-height: 1.26;
  color: var(--white);
}

.page-faq .step-intro {
  margin: 0 0 20px;
  max-width: 66ch;
  color: var(--ink-dim);
  font-size: 16px;
}

/* ---------- 图示 ---------- */
.page-faq .faq-figure {
  margin: 0 0 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--abyss);
  overflow: hidden;
}

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

.page-faq .faq-figure .media-caption {
  display: block;
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-dim);
}

/* ---------- 步骤列表 ---------- */
.page-faq .do-list {
  counter-reset: faq-step;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .do-list li {
  counter-increment: faq-step;
  position: relative;
  padding: 16px 18px 16px 62px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color var(--ease), background var(--ease);
}

.page-faq .do-list li:hover {
  border-color: var(--cyan);
  background: #16305４;
}

.page-faq .do-list li::before {
  content: counter(faq-step, decimal-leading-zero);
  position: absolute;
  left: 16px;
  top: 16px;
  padding: 1px 6px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--orange);
}

.page-faq .do-list strong {
  color: var(--white);
  font-weight: 700;
}

.page-faq .do-list .data-mono {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--cyan-soft);
}

/* ---------- 结果提示块 ---------- */
.page-faq .result-note {
  margin-top: 20px;
  padding: 14px 18px;
  border-left: 2px solid var(--cyan);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: rgba(0, 229, 255, 0.06);
  transition: background var(--ease);
}

.page-faq .result-note:hover {
  background: rgba(0, 229, 255, 0.13);
}

.page-faq .result-label {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-faq .result-note p {
  margin: 0;
  font-size: 15px;
  color: var(--ink);
}

/* ---------- 折叠排查清单 ---------- */
.page-faq .check-list {
  display: grid;
  gap: 10px;
}

.page-faq .check-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  overflow: hidden;
  transition: border-color var(--ease);
}

.page-faq .check-item:hover {
  border-color: var(--cyan);
}

.page-faq .check-item > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
  transition: color var(--ease), background var(--ease);
}

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

.page-faq .check-item > summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--cyan);
}

.page-faq .check-item[open] > summary {
  border-bottom: 1px solid var(--line);
  color: var(--cyan-soft);
  background: rgba(0, 229, 255, 0.05);
}

.page-faq .check-item[open] > summary::after {
  content: "−";
}

.page-faq .check-points {
  list-style: none;
  margin: 0;
  padding: 14px 18px 16px 18px;
  display: grid;
  gap: 9px;
}

.page-faq .check-points li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  color: var(--ink);
}

.page-faq .check-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 9px;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 联系方式条 ---------- */
.page-faq .contact-strip {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 24px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-faq .contact-cell {
  padding: 18px 18px 20px;
  background: var(--abyss);
}

.page-faq .contact-cell .coord-label {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-faq .contact-value {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--white);
  word-break: break-all;
}

.page-faq .contact-hint {
  margin: 0;
  font-size: 14px;
  color: var(--ink-dim);
}

.page-faq .step-links {
  margin: 22px 0 0;
  font-size: 15px;
  color: var(--ink-dim);
}

.page-faq .step-links a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}

.page-faq .step-links a:hover,
.page-faq .step-links a:focus-visible {
  color: var(--white);
  border-bottom-color: var(--cyan);
}

/* ---------- 焦点可见性 ---------- */
.page-faq a:focus-visible,
.page-faq summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .hero-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .contact-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-faq .breadcrumb {
    padding-top: 26px;
  }

  .page-faq .faq-hero {
    padding: 44px 0 48px;
  }

  .page-faq .guide-layout {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: 60px;
    padding-top: 48px;
  }

  .page-faq .step-rail {
    position: sticky;
    top: 88px;
    align-self: start;
  }

  .page-faq .faq-hero::after {
    width: 180px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .step-link,
  .page-faq .step-chev,
  .page-faq .do-list li,
  .page-faq .result-note,
  .page-faq .check-item,
  .page-faq .step-links a {
    transition: none;
  }
}