/* =========================================
   page-faq · 问题排查
   作用域：.page-faq
   ========================================= */

.page-faq {
  display: block;
  background: var(--paper);
  color: var(--ink);
}

.page-faq .breadcrumb {
  padding-top: 26px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.page-faq .breadcrumb a {
  color: var(--sky);
  text-decoration: none;
  border-bottom: 2px solid transparent;
}

.page-faq .breadcrumb a:hover,
.page-faq .breadcrumb a:focus-visible {
  border-bottom-color: var(--orange);
}

/* ---------- 首屏 ---------- */

.fx-hero {
  padding: 30px 0 42px;
}

.fx-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

.fx-hero__title {
  margin: 14px 0 0;
  font-size: clamp(36px, 7vw, 74px);
  line-height: 1.04;
  letter-spacing: -0.015em;
}

.fx-lead {
  margin: 22px 0 0;
  font-size: 17px;
  line-height: 1.85;
}

.fx-quick {
  border: var(--edge);
  background: var(--snow);
  box-shadow: var(--shadow-hard);
  padding: 20px 22px 22px;
}

.fx-quick__t {
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--teal);
}

.fx-quick__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.fx-quick__list li {
  border-top: 2px solid var(--ink);
}

.fx-quick__list li:first-child {
  border-top: 0;
}

.fx-quick__list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 0;
  color: var(--ink);
  text-decoration: none;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
}

.fx-quick__list a::after {
  content: "↓";
  font-family: var(--mono);
  font-weight: 400;
  color: var(--orange);
  flex: none;
}

.fx-quick__list a:hover,
.fx-quick__list a:focus-visible {
  color: var(--sky);
}

@media (min-width: 900px) {
  .fx-hero {
    padding: 46px 0 64px;
  }

  .fx-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 60px;
    align-items: end;
  }

  .fx-quick {
    margin-bottom: 6px;
  }
}

/* ---------- 区块标题 ---------- */

.fx-sec-head {
  margin-bottom: 32px;
}

.fx-sec-head .title-lg {
  margin: 12px 0 0;
  font-size: clamp(28px, 4.4vw, 46px);
  line-height: 1.15;
}

.fx-sec-note {
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.85;
}

/* ---------- 三步动作 ---------- */

.fx-steps__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--edge);
}

.fx-step {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 4px 18px;
  padding: 22px 0;
  border-bottom: var(--edge-2);
  transition: background-color 0.18s ease;
}

.fx-step__n {
  grid-row: 1 / 3;
  font-family: var(--mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--sky);
}

.fx-step__t {
  margin: 0;
  font-size: 19px;
  font-weight: 800;
  line-height: 1.4;
  letter-spacing: -0.01em;
}

.fx-step__d {
  margin: 6px 0 0;
  font-size: 16px;
  line-height: 1.8;
}

.fx-step:hover {
  background: var(--paper-2);
}

.fx-steps__foot {
  margin: 22px 0 0;
  padding-left: 16px;
  border-left: 4px solid var(--orange);
  font-size: 15px;
  line-height: 1.8;
  color: var(--teal);
}

@media (min-width: 820px) {
  .fx-step {
    grid-template-columns: 92px minmax(0, 300px) minmax(0, 1fr);
    gap: 0 24px;
    align-items: baseline;
    padding: 26px 0;
  }

  .fx-step__n {
    grid-row: auto;
    font-size: 30px;
  }

  .fx-step__d {
    margin-top: 0;
  }
}

/* ---------- 入口位置 ---------- */

.fx-entry {
  background: var(--paper-2);
  border-top: var(--edge);
  border-bottom: var(--edge);
}

.fx-map {
  margin: 0 0 34px;
  border: var(--edge);
  background: var(--snow);
  box-shadow: var(--shadow-hard);
  padding: 16px 14px 12px;
}

.fx-map svg {
  display: block;
  width: 100%;
  height: auto;
}

.fx-map__cap {
  margin: 10px 4px 4px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--teal);
}

.fx-wire {
  fill: none;
  stroke: var(--ink);
  stroke-width: 3;
}

.fx-wire--fill {
  fill: var(--snow);
}

.fx-wire--sky {
  fill: var(--sky);
}

.fx-wire--orange {
  fill: var(--orange);
}

.fx-wire-t {
  font-family: var(--mono);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.08em;
  fill: var(--snow);
}

.fx-wire-l {
  font-family: var(--mono);
  font-size: 16px;
  letter-spacing: 0.08em;
  fill: var(--ink);
}

.fx-wire-l--sub {
  font-size: 13px;
  fill: var(--teal);
}

.fx-path {
  fill: none;
  stroke-width: 3;
  stroke-dasharray: 11 9;
}

.fx-path--sky {
  stroke: var(--sky);
}

.fx-path--orange {
  stroke: var(--orange);
}

.fx-dot {
  stroke: var(--ink);
  stroke-width: 3;
}

.fx-dot--sky {
  fill: var(--sky);
}

.fx-dot--orange {
  fill: var(--orange);
}

.fx-node {
  cursor: pointer;
  outline: none;
}

.fx-node__tip {
  opacity: 0.28;
  transition: opacity 0.18s ease;
}

.fx-node:hover .fx-node__tip,
.fx-node:focus-visible .fx-node__tip {
  opacity: 1;
}

.fx-node:focus-visible .fx-dot {
  stroke: var(--orange);
  stroke-width: 5;
}

.fx-tipbox {
  fill: var(--snow);
  stroke: var(--ink);
  stroke-width: 2;
}

.fx-tiptext {
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  fill: var(--ink);
}

.fx-ways {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  margin-bottom: 36px;
}

.fx-way {
  padding: 22px 22px 24px;
  border-left-width: 8px;
}

.fx-way--sky {
  border-left-color: var(--sky);
}

.fx-way--orange {
  border-left-color: var(--orange);
}

.fx-way__k {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--teal);
}

.fx-way__t {
  margin: 0;
  font-size: 20px;
  font-weight: 800;
  line-height: 1.35;
}

.fx-way__d {
  margin: 12px 0 0;
  font-size: 16px;
  line-height: 1.8;
}

.fx-entry__shot {
  margin: 0;
}

@media (min-width: 820px) {
  .fx-ways {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px;
  }
}

/* ---------- 自检清单 ---------- */

.fx-check__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
}

.fx-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.fx-list__item {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0;
  border-top: var(--edge-2);
}

.fx-list__item:last-child {
  border-bottom: var(--edge-2);
}

.fx-box {
  position: relative;
  display: block;
  width: 22px;
  height: 22px;
  margin-top: 3px;
  border: var(--edge-2);
  background: var(--snow);
}

.fx-box::after {
  content: "";
  position: absolute;
  left: 6px;
  top: 2px;
  width: 6px;
  height: 12px;
  border-right: 3px solid var(--green);
  border-bottom: 3px solid var(--green);
  transform: rotate(42deg);
}

.fx-list__t {
  margin: 0;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.5;
}

.fx-list__d {
  margin: 6px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
}

.fx-check__shot {
  margin: 0;
}

@media (min-width: 900px) {
  .fx-check__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 380px);
    gap: 48px;
    align-items: start;
  }
}

/* ---------- 问答阶梯 ---------- */

.fx-ladder {
  background: var(--paper);
}

.fx-qa {
  border-top: var(--edge);
}

.fx-qa__item {
  border-bottom: var(--edge-2);
}

.fx-qa__item:nth-child(3n) {
  border-bottom: 4px solid var(--orange);
}

.fx-qa__sum {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr) 26px;
  gap: 14px;
  align-items: start;
  padding: 22px 0;
  cursor: pointer;
  list-style: none;
  outline: none;
}

.fx-qa__sum::-webkit-details-marker {
  display: none;
}

.fx-qa__sum:hover,
.fx-qa__sum:focus-visible {
  background: var(--paper-2);
}

.fx-qa__sum:focus-visible {
  box-shadow: inset 0 0 0 3px var(--orange);
}

.fx-qa__n {
  justify-self: start;
  padding: 5px 8px 4px;
  border: var(--edge-2);
  background: var(--snow);
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
}

.fx-qa__item[open] > .fx-qa__sum .fx-qa__n {
  background: var(--sky);
  color: var(--snow);
  border-color: var(--ink);
}

.fx-qa__q {
  margin: 0;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.5;
  letter-spacing: -0.005em;
}

.fx-qa__ic {
  position: relative;
  justify-self: end;
  width: 24px;
  height: 24px;
  border: var(--edge-2);
  background: var(--snow);
}

.fx-qa__ic::before,
.fx-qa__ic::after {
  content: "";
  position: absolute;
  background: var(--ink);
}

.fx-qa__ic::before {
  left: 4px;
  right: 4px;
  top: 50%;
  height: 2px;
  transform: translateY(-50%);
}

.fx-qa__ic::after {
  top: 4px;
  bottom: 4px;
  left: 50%;
  width: 2px;
  transform: translateX(-50%);
  transition: transform 0.16s ease;
}

.fx-qa__item[open] .fx-qa__ic::after {
  transform: translateX(-50%) scaleY(0);
}

.fx-qa__a {
  padding: 0 0 26px 70px;
}

.fx-qa__a p {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
}

.fx-qa__a a {
  color: var(--sky);
  text-decoration: none;
  border-bottom: 2px solid var(--orange-lt);
}

.fx-qa__a a:hover,
.fx-qa__a a:focus-visible {
  border-bottom-color: var(--orange);
}

@media (min-width: 720px) {
  .fx-qa__q {
    font-size: 20px;
  }

  .fx-qa__a {
    padding-left: 84px;
    max-width: 68ch;
  }

  .page-faq .fx-qa__item:nth-child(2) .fx-qa__a {
    padding-left: 96px;
  }

  .page-faq .fx-qa__item:nth-child(3) .fx-qa__a {
    padding-left: 108px;
  }

  .page-faq .fx-qa__item:nth-child(n + 3) .fx-qa__a {
    max-width: 58ch;
  }
}

/* ---------- 反馈 ---------- */

.fx-fb__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  margin-bottom: 34px;
}

.fx-fb__card {
  padding: 22px 22px 24px;
}

.fx-fb__k {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--orange);
}

.fx-fb__t {
  margin: 0;
  font-size: 19px;
  font-weight: 800;
  line-height: 1.4;
}

.fx-fb__d {
  margin: 10px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
}

.fx-mail {
  border: var(--edge);
  background: var(--teal);
  color: var(--snow);
  box-shadow: var(--shadow-hard-lg);
  padding: 26px 24px 24px;
}

.fx-mail__lede {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
}

.fx-mail__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 2px solid rgba(253, 252, 249, 0.3);
}

.fx-mail__addr {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
  word-break: break-all;
  color: var(--pulse-y);
}

.fx-mail__sub {
  margin: 16px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(253, 252, 249, 0.82);
}

.fx-mail__sub a {
  color: var(--orange-lt);
  text-decoration: none;
  border-bottom: 2px solid var(--orange-lt);
}

.fx-mail__sub a:hover,
.fx-mail__sub a:focus-visible {
  color: var(--snow);
  border-bottom-color: var(--snow);
}

.fx-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

@media (min-width: 820px) {
  .fx-fb__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }

  .fx-mail {
    padding: 32px 32px 30px;
  }
}

/* ---------- 底部脉冲带 ---------- */

.fx-pulse {
  margin-top: 56px;
  border-top: var(--edge);
}

.fx-pulse svg {
  display: block;
  width: 100%;
  height: 90px;
}

.fx-pulse .pulse-line {
  animation: fx-pulse-run 8s linear infinite;
}

.fx-pulse:hover .pulse-line {
  animation-duration: 3s;
}

@keyframes fx-pulse-run {
  0% {
    stroke-dasharray: 24 18;
    stroke-dashoffset: 0;
  }
  100% {
    stroke-dasharray: 24 18;
    stroke-dashoffset: -252;
  }
}

@media (prefers-reduced-motion: reduce) {
  .fx-pulse .pulse-line {
    animation: none;
  }

  .fx-node__tip,
  .fx-qa__ic::after,
  .fx-step {
    transition: none;
  }
}
<<<END>>>