.page-faq {
  --faq-gap: clamp(16px, 3vw, 32px);
  --faq-pad: clamp(16px, 3.2vw, 26px);
  position: relative;
}

.page-faq .faq-crumbs {
  padding-top: clamp(14px, 2.4vw, 24px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(24px, 5vw, 52px) 0 clamp(20px, 4vw, 40px);
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(11, 46, 36, 0.75) 0%, rgba(5, 13, 10, 0.4) 62%, transparent 100%),
    repeating-linear-gradient(90deg, transparent 0 95px, var(--line-soft) 95px 96px),
    repeating-linear-gradient(0deg, transparent 0 95px, var(--line-soft) 95px 96px);
}

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

.page-faq .faq-kicker {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.1;
  font-size: clamp(1.9rem, 7.4vw, 4.2rem);
  color: var(--chalk);
}

.page-faq .faq-title::after {
  content: "";
  display: block;
  width: clamp(56px, 12vw, 120px);
  height: 6px;
  margin-top: clamp(14px, 2.4vw, 22px);
  background: var(--amber);
}

.page-faq .faq-lead {
  max-width: 62ch;
  margin: clamp(16px, 2.6vw, 24px) 0 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--steel);
}

.page-faq .faq-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
}

/* ---------- 症状卡片 ---------- */
.page-faq .faq-cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-gap);
}

.page-faq .faq-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: var(--faq-pad);
}

.page-faq .faq-card-num {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-faq .faq-card h3 {
  margin: 0;
  font-size: clamp(1.05rem, 2.6vw, 1.25rem);
  line-height: 1.4;
  color: var(--chalk);
}

.page-faq .faq-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--steel);
}

.page-faq .faq-card-link {
  margin-top: auto;
  padding-top: 6px;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  align-self: flex-start;
}

.page-faq .faq-card-link:hover,
.page-faq .faq-card-link:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 排查工作区 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--faq-gap);
  align-items: start;
}

.page-faq .faq-rail,
.page-faq .faq-items {
  grid-column: span 12;
  min-width: 0;
}

.page-faq .faq-rail {
  padding: var(--faq-pad);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--glass);
}

.page-faq .faq-rail-label {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber);
}

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

.page-faq .faq-rail-list a {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 9px 10px;
  border-left: 2px solid var(--line);
  font-size: 14.5px;
  line-height: 1.5;
  color: var(--chalk);
  text-decoration: none;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.page-faq .faq-rail-list a:hover,
.page-faq .faq-rail-list a:focus-visible {
  border-left-color: var(--amber);
  background: rgba(245, 197, 66, 0.08);
}

.page-faq .faq-rail-list .mono {
  font-size: 12px;
  color: var(--steel);
}

.page-faq .faq-rail-note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 折叠条目 ---------- */
.page-faq .faq-items {
  display: grid;
  gap: clamp(12px, 2vw, 16px);
}

.page-faq .faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(242, 246, 243, 0.035);
  overflow: hidden;
}

.page-faq .faq-item[open] {
  border-color: var(--amber-dim);
  background: rgba(20, 81, 63, 0.32);
}

.page-faq .faq-summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: clamp(14px, 2.4vw, 20px);
  cursor: pointer;
  list-style: none;
}

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

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

.page-faq .faq-summary-num {
  flex: none;
  width: 42px;
  font-size: 15px;
  font-weight: 700;
  color: var(--amber);
}

.page-faq .faq-summary-text {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
  flex: 1 1 auto;
}

.page-faq .faq-summary-text strong {
  font-size: clamp(1rem, 3.4vw, 1.12rem);
  line-height: 1.4;
  color: var(--chalk);
}

.page-faq .faq-summary-sub {
  font-size: 13px;
  line-height: 1.5;
  color: var(--steel);
}

.page-faq .faq-summary-chevron {
  flex: none;
  width: 10px;
  height: 10px;
  margin-right: 4px;
  border-right: 2px solid var(--amber);
  border-bottom: 2px solid var(--amber);
  transform: rotate(45deg);
  transition: transform 0.25s ease;
}

.page-faq .faq-item[open] .faq-summary-chevron {
  transform: rotate(-135deg);
}

.page-faq .faq-body {
  padding: 0 clamp(14px, 2.4vw, 20px) clamp(16px, 2.6vw, 22px);
  border-top: 1px dashed var(--line);
  animation: faq-open 0.26s ease;
}

@keyframes faq-open {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 步骤列表 ---------- */
.page-faq .faq-steps {
  margin: clamp(14px, 2.4vw, 20px) 0 0;
  padding: 0;
  list-style: none;
  counter-reset: faqstep;
  display: grid;
  gap: 16px;
}

.page-faq .faq-steps li {
  position: relative;
  counter-increment: faqstep;
  padding-left: 40px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--chalk);
}

.page-faq .faq-steps li::before {
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 3px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-faq .faq-steps li:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 15px;
  top: 24px;
  bottom: -16px;
  width: 1px;
  background: var(--line);
}

.page-faq .faq-steps a {
  color: var(--amber);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-note {
  margin: clamp(16px, 2.4vw, 20px) 0 0;
  padding: 12px 14px;
  border-left: 3px solid var(--cyan);
  background: rgba(53, 242, 214, 0.06);
  font-size: 14px;
  line-height: 1.7;
  color: var(--steel);
}

.page-faq .faq-note a {
  color: var(--cyan);
}

.page-faq .faq-figure {
  margin: clamp(16px, 2.6vw, 22px) 0 0;
}

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

/* ---------- 求助区 ---------- */
.page-faq .faq-help-panel {
  padding: clamp(20px, 4vw, 40px);
}

.page-faq .faq-help-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.2;
  font-size: clamp(1.5rem, 5vw, 2.3rem);
  color: var(--chalk);
}

.page-faq .faq-help-lead {
  max-width: 62ch;
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--steel);
}

.page-faq .faq-help-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: clamp(20px, 3vw, 28px) 0 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-faq .faq-help-item {
  padding: 16px 18px;
  background: rgba(5, 13, 10, 0.72);
}

.page-faq .faq-help-label {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-faq .faq-help-value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.5;
  color: var(--chalk);
  word-break: break-word;
}

.page-faq .faq-help-value--sm {
  font-family: var(--font-body);
  font-size: 14.5px;
}

.page-faq .faq-help-value a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan);
}

.page-faq .faq-help-sub {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--steel);
}

.page-faq .faq-help-tail {
  margin: clamp(18px, 2.6vw, 24px) 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--steel);
}

.page-faq .faq-help-tail a {
  color: var(--amber);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-figure-end {
  margin: clamp(24px, 4vw, 40px) 0 0;
}

/* ---------- 平板起两栏 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq-cards > :nth-child(even) {
    margin-top: clamp(20px, 3vw, 34px);
  }

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

/* ---------- 桌面：左窄右宽 + 左栏吸附 ---------- */
@media (min-width: 980px) {
  .page-faq .faq-rail {
    grid-column: span 3;
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-faq .faq-items {
    grid-column: span 9;
  }

  .page-faq .faq-help-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .faq-summary {
    gap: 18px;
  }

  .page-faq .faq-summary-num {
    width: 54px;
    font-size: 17px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-body {
    animation: none;
  }

  .page-faq .faq-summary-chevron,
  .page-faq .faq-rail-list a {
    transition: none;
  }
}