/* ============================================================
   问题排查 / page-faq
   ============================================================ */

.page-faq {
  --faq-num: clamp(52px, 8.5vw, 100px);
  --faq-line: 1px solid var(--blueprint);
  --faq-line-light: 1px solid rgba(246, 242, 236, 0.16);
  display: block;
  background: var(--paper);
  color: var(--ink);
}

.page-faq .breadcrumb {
  margin-bottom: 26px;
}

/* ---------------- 首屏 ---------------- */

.page-faq .tr-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(44px, 7vw, 96px) 0 clamp(40px, 5.5vw, 72px);
  border-bottom: var(--faq-line);
}

.page-faq .tr-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(217, 211, 200, 0.58) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(217, 211, 200, 0.58) 1px, transparent 1px);
  background-size: 84px 84px;
  -webkit-mask-image: radial-gradient(120% 92% at 10% 0%, #000 0%, transparent 76%);
  mask-image: radial-gradient(120% 92% at 10% 0%, #000 0%, transparent 76%);
  pointer-events: none;
}

.page-faq .tr-hero::after {
  content: "";
  position: absolute;
  left: -14%;
  top: 30%;
  width: 128%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--fox) 36%, var(--fox) 64%, transparent);
  transform: rotate(-5deg);
  opacity: 0.3;
  pointer-events: none;
}

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

.page-faq .tr-hero__title {
  margin: 20px 0 0;
  max-width: 11em;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(34px, 6.4vw, 82px);
  line-height: 1.04;
  letter-spacing: -0.025em;
  color: var(--ink);
}

.page-faq .tr-hero__lede {
  max-width: 40em;
  margin: 26px 0 0;
  font-family: var(--font-body);
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.78;
  color: var(--mid);
}

.page-faq .tr-hero__marks {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 40px;
  margin: 34px 0 0;
  padding: 20px 0 0;
  border-top: var(--faq-line);
  list-style: none;
}

.page-faq .tr-hero__marks li {
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.6;
  color: var(--mid);
}

.page-faq .tr-hero__marks span {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 22px;
  letter-spacing: 0;
  color: var(--ink);
}

/* ---------------- 分类入口 ---------------- */

.page-faq .tr-routes-sec {
  padding: clamp(44px, 6vw, 80px) 0 clamp(8px, 2vw, 20px);
}

.page-faq .tr-routes-head {
  max-width: 46em;
}

.page-faq .tr-routes-head__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(26px, 3.4vw, 42px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-faq .tr-routes-head__lede {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mid);
}

.page-faq .tr-map {
  margin: 36px 0 0;
  position: relative;
  border: var(--faq-line);
}

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

.page-faq .tr-routes {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  background: var(--blueprint);
  border: var(--faq-line);
}

.page-faq .tr-routes > li {
  display: flex;
  min-width: 0;
}

.page-faq .tr-route {
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1 1 auto;
  min-width: 0;
  padding: 26px 22px 28px;
  background: var(--paper);
  color: inherit;
  text-decoration: none;
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-faq .tr-route:hover,
.page-faq .tr-route:focus-visible {
  background: var(--tint);
  box-shadow: inset 0 -3px 0 var(--fox);
}

.page-faq .tr-route:focus-visible {
  outline: 2px solid var(--fox);
  outline-offset: 2px;
}

.page-faq .tr-route__num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--mid);
}

.page-faq .tr-route__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-faq .tr-route__desc {
  font-size: 14px;
  line-height: 1.72;
  color: var(--mid);
}

.page-faq .tr-route__go {
  margin-top: auto;
  padding-top: 16px;
  display: inline-flex;
  align-items: center;
  gap: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--ink);
}

.page-faq .tr-route__go::before {
  content: "";
  width: 12px;
  height: 1px;
  margin-right: 10px;
  background: var(--fox);
  transition: width var(--dur) var(--ease), margin-right var(--dur) var(--ease);
}

.page-faq .tr-route:hover .tr-route__go::before,
.page-faq .tr-route:focus-visible .tr-route__go::before {
  width: 22px;
  margin-right: 0;
}

/* ---------------- 问答账册 ---------------- */

.page-faq .tr-cats {
  padding-bottom: clamp(8px, 2vw, 20px);
}

.page-faq .tr-cat {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  padding: clamp(38px, 5vw, 68px) 0;
  border-top: var(--faq-line);
  scroll-margin-top: 104px;
}

.page-faq .tr-cat__idx {
  position: relative;
  min-width: 0;
}

.page-faq .tr-cat__num {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: var(--faq-num);
  line-height: 0.82;
  letter-spacing: -0.05em;
  color: var(--blueprint);
  transition: color var(--dur) var(--ease);
}

.page-faq .tr-cat:target .tr-cat__num {
  color: var(--mid);
}

.page-faq .tr-cat__name {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 2.2vw, 26px);
  letter-spacing: -0.015em;
  color: var(--ink);
  display: inline;
  background-image: linear-gradient(transparent 64%, var(--tint) 64%);
  background-repeat: no-repeat;
  background-size: 0% 100%;
  transition: background-size var(--dur) var(--ease);
}

.page-faq .tr-cat:target .tr-cat__name {
  background-size: 100% 100%;
}

.page-faq .tr-cat__meta {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.7;
  letter-spacing: 0.12em;
  color: var(--mid);
}

.page-faq .tr-cat__body {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

/* 单条问答 */

.page-faq .tr-item {
  border: var(--faq-line);
  background: var(--paper);
  box-shadow: inset 3px 0 0 transparent;
  transition: background var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.page-faq .tr-item + .tr-item {
  margin-top: 12px;
}

.page-faq .tr-item[open] {
  background: var(--tint);
  box-shadow: inset 3px 0 0 var(--fox);
  border-color: var(--ember);
}

.page-faq .tr-item > summary {
  position: relative;
  display: flex;
  align-items: flex-start;
  padding: 20px 56px 20px 20px;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 500;
  line-height: 1.62;
  color: var(--ink);
  transition: color var(--dur) var(--ease);
}

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

.page-faq .tr-item > summary::after {
  content: "";
  position: absolute;
  right: 22px;
  top: 50%;
  width: 11px;
  height: 11px;
  margin-top: -7px;
  border-right: 1.5px solid var(--mid);
  border-bottom: 1.5px solid var(--mid);
  transform: rotate(45deg);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .tr-item[open] > summary::after {
  transform: rotate(-135deg);
  border-color: var(--fox);
}

.page-faq .tr-item > summary:focus-visible {
  outline: 2px solid var(--fox);
  outline-offset: -2px;
}

.page-faq .tr-item__a {
  margin: 0 20px;
  padding: 18px 0 24px;
  border-top: var(--faq-line);
}

.page-faq .tr-item__a p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mid);
}

.page-faq .tr-item__a p + p {
  margin-top: 12px;
}

/* 步骤条：细线连接直角节点 */

.page-faq .tr-steps {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: faqstep;
}

.page-faq .tr-steps li {
  position: relative;
  padding-left: 36px;
  margin-bottom: 14px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mid);
}

.page-faq .tr-steps li:last-child {
  margin-bottom: 0;
}

.page-faq .tr-steps li::before {
  counter-increment: faqstep;
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink);
}

.page-faq .tr-steps li::after {
  content: "";
  position: absolute;
  left: 7px;
  top: 20px;
  bottom: -14px;
  width: 1px;
  background: var(--blueprint);
}

.page-faq .tr-steps li:last-child::after {
  display: none;
}

/* 配图 */

.page-faq .tr-figure {
  margin: 24px 0 0;
  position: relative;
  border: var(--faq-line);
}

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

/* ---------------- 收口 ---------------- */

.page-faq .tr-help {
  padding: clamp(40px, 6vw, 88px) 0 clamp(56px, 7vw, 100px);
}

.page-faq .tr-help__card {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  padding: clamp(30px, 4.6vw, 64px);
  background: var(--ink);
  color: var(--paper);
}

.page-faq .tr-help__card .eyebrow {
  color: var(--ember);
}

.page-faq .tr-help__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(24px, 3vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-faq .tr-help__lede {
  max-width: 34em;
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(246, 242, 236, 0.72);
}

.page-faq .tr-help__main .btn {
  margin-top: 26px;
}

.page-faq .tr-help__channels {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--faq-line-light);
}

.page-faq .tr-help__channels li {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 18px 0;
  border-bottom: var(--faq-line-light);
}

.page-faq .tr-help__channels span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--ember);
}

.page-faq .tr-help__channels strong {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 15px;
  line-height: 1.5;
  color: var(--paper);
  word-break: break-word;
}

/* ---------------- 揭示动效（渐进增强） ---------------- */

@keyframes faqFadeUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-faq [data-reveal].is-revealed {
  animation: faqFadeUp 360ms var(--ease) both;
}

/* ---------------- 响应式 ---------------- */

@media (min-width: 640px) {
  .page-faq .tr-routes {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-faq .tr-help__channels li {
    flex-direction: row;
    align-items: baseline;
    justify-content: space-between;
    gap: 24px;
  }
}

@media (min-width: 900px) {
  .page-faq .tr-cat {
    grid-template-columns: minmax(0, 250px) minmax(0, 1fr);
    gap: 56px;
  }

  .page-faq .tr-cat__idx {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-faq .tr-item > summary {
    padding: 22px 60px 22px 24px;
    font-size: 17px;
  }

  .page-faq .tr-item__a {
    margin: 0 24px;
    padding: 20px 0 26px;
  }
}

@media (min-width: 1024px) {
  .page-faq .tr-routes {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-faq .tr-help__card {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 64px;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
  }
}