/* ===== 问题排查 ===== */
.page-faq {
  --faq-gap: clamp(16px, 2.6vw, 30px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-faq .crumbs {
  margin-bottom: clamp(18px, 3vw, 34px);
}

.page-faq .section {
  margin-top: clamp(36px, 6vw, 76px);
}

.page-faq .h-bar {
  margin: 0 0 14px;
}

.page-faq .prose {
  margin: 0 0 8px;
  max-width: 70ch;
}

/* 首屏 */
.page-faq .faq-intro {
  display: grid;
  gap: 18px;
  padding-bottom: clamp(26px, 4vw, 46px);
  border-bottom: 1px solid var(--line-soft);
}

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

.page-faq .faq-intro h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.85rem, 5.4vw, 3.5rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--white);
  max-width: 24ch;
}

.page-faq .faq-intro .lede {
  margin: 0;
  max-width: 62ch;
}

.page-faq .faq-strip {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(158px, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-faq .faq-strip li {
  background: var(--panel);
  padding: 12px 14px;
  display: grid;
  gap: 6px;
  align-content: start;
}

.page-faq .faq-strip__k {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--dim);
}

.page-faq .faq-strip .mono {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--cyan);
}

/* 速查表 */
.page-faq .faq-shot {
  margin: 18px 0 var(--faq-gap);
}

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

.page-faq .table-scroll {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--panel);
  -webkit-overflow-scrolling: touch;
}

.page-faq .table-scroll:focus-visible {
  outline: 2px solid var(--coral);
  outline-offset: 2px;
}

.page-faq .quick-table {
  width: 100%;
  min-width: 780px;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.page-faq .quick-table thead th {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--dim);
  text-align: left;
  padding: 12px 14px;
  background: var(--lift);
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

.page-faq .quick-table thead th:first-child {
  position: sticky;
  left: 0;
  z-index: 2;
}

.page-faq .quick-table th,
.page-faq .quick-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line-soft);
  vertical-align: top;
  line-height: 1.65;
}

.page-faq .quick-table tbody th {
  position: sticky;
  left: 0;
  z-index: 1;
  background: var(--panel);
  color: var(--white);
  font-weight: 600;
  text-align: left;
  white-space: nowrap;
}

.page-faq .quick-table td {
  color: var(--muted);
}

.page-faq .quick-table tbody tr:last-child th,
.page-faq .quick-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-faq .quick-table tbody tr:hover th,
.page-faq .quick-table tbody tr:hover td {
  background: var(--lift);
  color: var(--white);
}

.page-faq .row-link {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  white-space: nowrap;
  transition: color var(--t-fast), border-color var(--t-fast), opacity var(--t-fast);
}

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

@media (hover: hover) {
  .page-faq .row-link {
    opacity: 0.55;
  }
  .page-faq .quick-table tbody tr:hover .row-link,
  .page-faq .quick-table tbody tr:focus-within .row-link {
    opacity: 1;
  }
}

/* 筛选 */
.page-faq .filters {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.page-faq .filters__count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--dim);
}

/* 折叠排查条目 */
.page-faq .faq-list {
  display: grid;
  gap: 12px;
  margin-top: var(--faq-gap);
}

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

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

.page-faq .faq-item summary {
  position: relative;
  list-style: none;
  cursor: pointer;
  padding: 16px 46px 16px 26px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1rem, 1.5vw, 1.12rem);
  line-height: 1.5;
  color: var(--white);
  transition: color var(--t-fast), background var(--t-fast);
}

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

.page-faq .faq-item summary::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 20px;
  bottom: 20px;
  width: 3px;
  border-radius: 2px;
  background: var(--gold-deep);
  transition: background var(--t-fast), top var(--t-fast), bottom var(--t-fast);
}

.page-faq .faq-item[open] summary::before {
  background: var(--cyan);
  top: 24px;
  bottom: 24px;
}

.page-faq .faq-item summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--dim);
}

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

.page-faq .faq-item summary:hover,
.page-faq .faq-item summary:focus-visible {
  background: var(--lift);
}

.page-faq .faq-item__body {
  padding: 4px clamp(18px, 3vw, 30px) 22px clamp(26px, 3.4vw, 34px);
}

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

.page-faq .steps > li {
  counter-increment: faqstep;
  display: grid;
  grid-template-columns: 2.4rem 1fr;
  gap: 12px;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .steps > li::before {
  content: counter(faqstep, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--cyan-deep);
  padding-top: 0.42em;
}

.page-faq .faq-note {
  margin: 18px 0 0;
  padding: 10px 0 10px 14px;
  border-left: 2px solid var(--line);
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--dim);
}

/* 画质档位 */
.page-faq .tier-grid {
  display: grid;
  gap: 14px;
  margin-top: var(--faq-gap);
}

.page-faq .tier {
  display: grid;
  gap: 12px;
  align-content: start;
  padding: 18px 16px 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 3px solid var(--dim);
  border-radius: var(--r-md);
}

.page-faq .tier--mid {
  border-top-color: var(--cyan-deep);
}

.page-faq .tier--high {
  border-top-color: var(--cyan);
}

.page-faq .tier__name {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--white);
}

.page-faq .tier__spec {
  margin: -6px 0 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--dim);
}

.page-faq .tier__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-faq .tier__list li {
  display: grid;
  grid-template-columns: 5rem 1fr;
  gap: 10px;
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--muted);
}

.page-faq .tier__key {
  font-size: 0.78rem;
  color: var(--dim);
}

.page-faq .tier__list .mono {
  font-family: var(--font-mono);
  color: var(--cyan);
}

.page-faq .faq-shot--perf {
  margin: var(--faq-gap) 0 0;
}

/* 礼包码三种情况 */
.page-faq .case-list {
  list-style: none;
  margin: var(--faq-gap) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-faq .case {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: 18px 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
}

.page-faq .case p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--muted);
}

.page-faq .case__how {
  padding-top: 12px;
  border-top: 1px dashed var(--line-soft);
}

/* 线路选择 */
.page-faq .line-list {
  list-style: none;
  margin: var(--faq-gap) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-faq .line-list > li {
  background: var(--panel);
  padding: 14px 16px;
  display: grid;
  gap: 6px;
}

.page-faq .line-list__k {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.94rem;
  color: var(--cyan);
}

.page-faq .line-list p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--muted);
}

/* 求助清单 */
.page-faq .need-list {
  list-style: none;
  margin: 20px 0 26px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .need-list li {
  display: grid;
  grid-template-columns: 2.4rem 1fr;
  gap: 12px;
  font-size: 0.94rem;
  line-height: 1.72;
  color: var(--muted);
}

.page-faq .need-list .mono {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--dim);
  padding-top: 0.3em;
}

.page-faq .cluster {
  margin: 22px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .cluster .btn {
  text-decoration: none;
}

/* 中等屏幕 */
@media (min-width: 760px) {
  .page-faq .tier-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-faq .line-list > li {
    grid-template-columns: 8.5rem 1fr;
    gap: 20px;
    align-items: baseline;
  }
}

/* 宽屏：三种情况横向并排 */
@media (min-width: 960px) {
  .page-faq .case-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-item summary {
    padding: 18px 52px 18px 30px;
  }

  .page-faq .faq-item__body {
    padding: 6px clamp(20px, 3vw, 34px) 26px 40px;
  }
}