.page-faq {
  --faq-gap: clamp(20px, 3vw, 34px);
  --faq-soft: #45626d;
  --faq-teal: #0a6c72;
  background: var(--deep);
  color: var(--paper);
  overflow-x: clip;
}

.page-faq .faq-head {
  max-width: 46em;
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-faq .faq-head .section-title {
  margin: 8px 0 10px;
  font-family: var(--font-cond);
  font-size: clamp(24px, 3.6vw, 34px);
  line-height: 1.2;
  letter-spacing: .02em;
}

.page-faq .faq-head .section-sub {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
}

.page-faq-crumb {
  padding-top: 14px;
}

.page-faq .breadcrumb {
  font-size: 13px;
}

.page-faq .breadcrumb a {
  color: var(--steel);
  text-decoration: none;
}

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

.page-faq .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--steel);
}

.page-faq .breadcrumb-list li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--line);
}

/* ---------- 首屏 ---------- */

.faq-hero {
  position: relative;
  padding: clamp(26px, 4vw, 48px) 0 clamp(44px, 6vw, 76px);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(45, 226, 197, .14), transparent 58%),
    repeating-linear-gradient(90deg, var(--grid-line) 0 1px, transparent 1px 92px),
    repeating-linear-gradient(0deg, var(--grid-line) 0 1px, transparent 1px 92px),
    var(--deep);
}

.faq-hero-grid {
  display: grid;
  gap: var(--faq-gap);
  align-items: start;
}

.faq-hero h1 {
  margin: 10px 0 0;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: clamp(30px, 6.2vw, 52px);
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--paper);
}

.faq-hero h1::after {
  content: "";
  display: block;
  width: 72px;
  height: 3px;
  margin-top: 18px;
  background: var(--cyan);
}

.faq-hero .eyebrow {
  margin: 0;
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
}

.faq-hero .lede {
  max-width: 40em;
  margin: 20px 0 0;
  font-size: clamp(15px, 1.6vw, 16.5px);
  line-height: 1.85;
  color: var(--mist);
}

.faq-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.faq-check {
  padding: 20px 18px 18px;
  border: 1px solid var(--line-cyan);
  background: rgba(11, 59, 82, .78);
}

.faq-check-kicker {
  margin: 0 0 10px;
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--cyan);
}

.faq-check .lane-card-title {
  margin: 0 0 14px;
  font-size: 18px;
  line-height: 1.45;
  font-weight: 600;
  color: var(--paper);
}

.check-list {
  display: grid;
  gap: 2px;
}

.check-item {
  position: relative;
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 11px 0;
  border-bottom: 1px solid var(--line-soft);
  cursor: pointer;
}

.check-item:last-child {
  border-bottom: 0;
}

.check-item input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.check-box {
  position: relative;
  flex: 0 0 16px;
  width: 16px;
  height: 16px;
  margin-top: 3px;
  border: 1px solid var(--steel);
  transition: border-color .18s ease, background-color .18s ease;
}

.check-item input:checked + .check-box {
  border-color: var(--cyan);
  background: rgba(45, 226, 197, .16);
}

.check-item input:checked + .check-box::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 1px;
  width: 6px;
  height: 10px;
  border-right: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
  transform: rotate(40deg);
}

.check-item input:focus-visible + .check-box {
  outline: 2px solid var(--yellow);
  outline-offset: 2px;
}

.check-text {
  font-size: 14px;
  line-height: 1.6;
  color: var(--mist);
}

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

.faq-check-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
}

/* ---------- 浅色分区 ---------- */

.page-faq .band-light {
  background: var(--paper);
  color: var(--ink);
}

.page-faq .band-light .section-title {
  color: var(--ink);
}

.page-faq .band-light .section-sub {
  color: var(--faq-soft);
}

.page-faq .eyebrow--dark {
  margin: 0;
  color: var(--faq-teal);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
}

/* ---------- 快速排查 ---------- */

.triage-grid {
  display: grid;
  gap: var(--faq-gap);
}

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

.triage-step {
  position: relative;
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 16px;
  padding-bottom: 26px;
}

.triage-step:last-child {
  padding-bottom: 0;
}

.triage-step::before {
  content: "";
  position: absolute;
  left: 25px;
  top: 58px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--line-cyan), rgba(6, 42, 58, .12));
}

.triage-step:last-child::before {
  display: none;
}

.triage-num {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  font-size: 14px;
  color: var(--cyan);
  background: var(--deep);
  border: 1px solid var(--line-cyan);
}

.triage-body h3 {
  margin: 9px 0 8px;
  font-size: 17.5px;
  line-height: 1.4;
  color: var(--ink);
}

.triage-body p {
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--faq-soft);
}

.triage-out {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: baseline;
  font-size: 13.5px;
  color: var(--faq-teal);
}

.triage-out .tag {
  flex: 0 0 auto;
  background: rgba(45, 226, 197, .18);
  color: #0a6c72;
  border: 1px solid rgba(10, 108, 114, .32);
}

.triage-media {
  margin: 0;
}

.triage-media .media-frame {
  aspect-ratio: 10 / 7;
}

.triage-media .media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.triage-media figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--faq-soft);
}

/* ---------- 问答区 ---------- */

.faq-qa {
  background: linear-gradient(180deg, var(--deep), var(--ink) 72%, var(--deep));
}

.faq-head--dark .section-title {
  color: var(--paper);
}

.faq-head--dark .section-sub {
  color: var(--steel);
}

.faq-head--dark .eyebrow {
  margin: 0;
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
}

.qa-layout {
  display: grid;
  gap: var(--faq-gap);
}

.qa-side {
  display: grid;
  gap: 16px;
}

.qa-index {
  padding: 16px 18px 18px;
  border: 1px solid var(--line);
  background: rgba(11, 59, 82, .6);
}

.qa-index-title {
  margin: 0;
  font-size: 11.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.qa-index ul {
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
}

.qa-index li {
  border-bottom: 1px solid var(--line-soft);
}

.qa-index li:last-child {
  border-bottom: 0;
}

.qa-index a {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 11px 0;
  font-size: 14px;
  color: var(--mist);
  text-decoration: none;
  transition: color .16s ease;
}

.qa-index a:hover,
.qa-index a:focus-visible {
  color: var(--cyan);
}

.qa-index a .mono {
  font-size: 12px;
  color: var(--steel);
}

.qa-side-card {
  padding: 16px 18px 18px;
  border: 1px solid var(--line-soft);
  background: transparent;
}

.qa-side-text {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--steel);
}

.qa-side-text strong {
  color: var(--orange);
  font-family: var(--font-mono);
  font-weight: 500;
}

.qa-body {
  display: grid;
  gap: 30px;
}

.qa-group-title {
  display: flex;
  gap: 12px;
  align-items: baseline;
  margin: 0 0 8px;
  padding-bottom: 12px;
  font-family: var(--font-cond);
  font-size: 20px;
  letter-spacing: .04em;
  color: var(--paper);
  border-bottom: 1px solid var(--line-cyan);
}

.qa-group-title .mono {
  font-size: 12.5px;
  color: var(--orange);
}

.qa-item {
  border-bottom: 1px solid var(--line-soft);
  transition: background-color .2s ease;
}

.qa-item[open] {
  background: rgba(11, 59, 82, .5);
}

.qa-item summary {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) 22px;
  gap: 12px;
  align-items: center;
  padding: 15px 6px;
  list-style: none;
  cursor: pointer;
}

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

.qa-item summary:hover .qa-q {
  color: var(--cyan);
}

.qa-num {
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--steel);
}

.qa-q {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--paper);
  transition: color .16s ease;
}

.qa-state {
  position: relative;
  width: 20px;
  height: 20px;
  border: 1px solid var(--line);
  transition: border-color .18s ease, background-color .18s ease;
}

.qa-state::before,
.qa-state::after {
  content: "";
  position: absolute;
  background: var(--steel);
  transition: transform .18s ease, background-color .18s ease;
}

.qa-state::before {
  left: 4px;
  top: 9px;
  width: 10px;
  height: 1px;
}

.qa-state::after {
  left: 9px;
  top: 4px;
  width: 1px;
  height: 10px;
}

.qa-item[open] .qa-state {
  border-color: var(--cyan);
  background: rgba(45, 226, 197, .16);
}

.qa-item[open] .qa-state::before,
.qa-item[open] .qa-state::after {
  background: var(--cyan);
}

.qa-item[open] .qa-state::after {
  transform: scaleY(0);
}

.qa-a {
  padding: 0 6px 18px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist);
}

.qa-a p {
  margin: 0 0 10px;
}

.qa-a p:last-child {
  margin-bottom: 0;
}

.qa-a ul {
  margin: 0 0 12px;
  padding-left: 18px;
}

.qa-a li {
  margin-bottom: 6px;
}

.qa-a strong {
  color: var(--paper);
  font-weight: 600;
}

.qa-a a {
  color: var(--cyan);
}

/* ---------- 反馈提交 ---------- */

.faq-feedback {
  padding: clamp(44px, 6vw, 76px) 0;
  background: linear-gradient(140deg, var(--ink) 0%, var(--lane) 55%, var(--deep) 100%);
  border-top: 1px solid var(--line-cyan);
  border-bottom: 1px solid var(--line-soft);
}

.feedback-grid {
  display: grid;
  gap: var(--faq-gap);
}

.feedback-main .eyebrow {
  margin: 0;
  color: var(--orange);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
}

.feedback-main .section-title {
  margin: 10px 0 12px;
  font-family: var(--font-cond);
  font-size: clamp(23px, 3.4vw, 32px);
  line-height: 1.25;
  letter-spacing: .02em;
  color: var(--paper);
}

.feedback-main .section-sub {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--steel);
}

.path-steps {
  counter-reset: pstep;
  display: grid;
  gap: 12px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.path-steps li {
  counter-increment: pstep;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

.path-steps li::before {
  content: counter(pstep, decimal-leading-zero);
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--orange);
}

.feedback-tpl {
  margin: 22px 0 0;
  padding: 16px 18px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.9;
  color: var(--mist);
  white-space: pre-wrap;
  overflow-x: auto;
  background: rgba(2, 26, 36, .74);
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--orange);
}

.feedback-media {
  margin: 0;
}

.feedback-media .media-frame {
  aspect-ratio: 5 / 3;
}

.feedback-media .media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.feedback-media figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--steel);
}

/* ---------- 人工通道 ---------- */

.channel-grid {
  display: grid;
  gap: 16px;
}

.channel {
  padding: 20px 18px 18px;
  background: #ffffff;
  border: 1px solid rgba(6, 42, 58, .16);
  border-top: 3px solid var(--cyan);
}

.channel-label {
  margin: 0 0 10px;
  font-size: 11.5px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--faq-teal);
}

.channel-val {
  margin: 0 0 12px;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink);
  word-break: break-word;
}

.channel-val.mono {
  font-family: var(--font-mono);
  letter-spacing: .01em;
}

.channel-val--mail {
  font-size: 14.5px;
}

.channel-text {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--faq-soft);
}

.channel-time {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--faq-teal);
}

.faq-next {
  margin-top: 30px;
  padding-top: 18px;
  border-top: 1px solid rgba(6, 42, 58, .16);
}

.faq-next p {
  margin: 0 0 12px;
  font-size: 11.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--faq-teal);
}

.faq-next ul {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.faq-next a {
  display: inline-block;
  padding-bottom: 2px;
  font-size: 14px;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid rgba(10, 108, 114, .4);
}

.faq-next a:hover,
.faq-next a:focus-visible {
  color: var(--faq-teal);
}

/* ---------- 响应式 ---------- */

@media (min-width: 760px) {
  .qa-a {
    margin-left: 54px;
    padding: 4px 16px 22px 16px;
    border-left: 2px solid var(--line-cyan);
  }

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

@media (min-width: 900px) {
  .faq-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

  .triage-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .feedback-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .channel-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .qa-layout {
    grid-template-columns: 288px minmax(0, 1fr);
    align-items: start;
    gap: clamp(26px, 3vw, 44px);
  }

  .qa-side {
    position: sticky;
    top: calc(var(--header-h) + 18px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa-item,
  .page-faq .qa-q,
  .page-faq .qa-state,
  .page-faq .qa-state::before,
  .page-faq .qa-state::after,
  .page-faq .qa-index a,
  .page-faq .check-box {
    transition: none;
  }
}
<<<END>>>