.page-faq {
  --faq-deep: #05050c;
  --faq-gap: clamp(16px, 2.2vw, 28px);
  --faq-pad: clamp(18px, 2.4vw, 30px);
  position: relative;
  background: var(--midnight);
  color: var(--mist);
  padding-top: clamp(84px, 13vh, 148px);
  overflow-x: hidden;
}

.page-faq * {
  box-sizing: border-box;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding-block: clamp(8px, 2vh, 26px) clamp(40px, 7vh, 84px);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-gap);
}

.page-faq .faq-hero__lead {
  min-width: 0;
}

.page-faq .breadcrumb {
  margin-bottom: 18px;
}

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

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

.page-faq .faq-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 6.6vw, 78px);
  line-height: 1.04;
  letter-spacing: -0.012em;
  color: var(--mist);
  text-shadow: 3px 0 0 rgba(255, 46, 136, 0.34), -3px 0 0 rgba(34, 224, 255, 0.3);
}

.page-faq .faq-hero__lede {
  max-width: 40em;
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  font-family: var(--font-body);
  font-size: clamp(16px, 1.15vw, 17px);
  line-height: 1.78;
  color: var(--mist);
  opacity: .88;
}

.page-faq .faq-hero__actions {
  margin-top: clamp(22px, 3vw, 34px);
}

/* 右侧状态栏 */
.page-faq .faq-rail {
  position: relative;
  padding: var(--faq-pad);
  background: linear-gradient(180deg, var(--indigo) 0%, var(--midnight) 100%);
  border: 2px solid var(--line);
  border-top: 4px solid var(--cyan);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}

.page-faq .faq-rail__list li + li {
  border-top: 1px dashed var(--line-soft);
}

.page-faq .faq-rail__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 2px;
  font-size: 14px;
  color: var(--mist);
  text-decoration: none;
  transition: color 200ms var(--ease-hard), padding-left 200ms var(--ease-hard);
}

.page-faq .faq-rail__list a .mono {
  font-size: 12px;
  color: var(--violet-gray);
  letter-spacing: 0.08em;
}

.page-faq .faq-rail__list a:hover,
.page-faq .faq-rail__list a:focus-visible {
  color: var(--cyan);
  padding-left: 8px;
}

.page-faq .faq-rail__list a:hover .mono,
.page-faq .faq-rail__list a:focus-visible .mono {
  color: var(--magenta);
}

.page-faq .faq-rail__note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 13px;
  line-height: 1.7;
  color: var(--violet-gray);
}

/* ---------- 通用小节头 ---------- */
.page-faq .faq-head {
  max-width: 46em;
  margin-bottom: clamp(24px, 3.4vw, 44px);
}

.page-faq .faq-head h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 3.6vw, 46px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-faq .faq-head__sub {
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.76;
  color: var(--violet-gray);
}

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

.page-faq .faq-symptom__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .faq-symptom__item {
  position: relative;
  display: grid;
  gap: 6px;
  padding: 16px 18px 16px 22px;
  background: var(--charcoal);
  border: 1px solid var(--line-soft);
  border-left: 8px solid var(--cyan);
}

.page-faq .faq-symptom__item:nth-child(2) {
  border-left-color: var(--magenta);
}

.page-faq .faq-symptom__item:nth-child(3) {
  border-left-color: var(--yellow);
}

.page-faq .faq-symptom__item:nth-child(4) {
  border-left-color: var(--green);
}

.page-faq .faq-symptom__code {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--violet-gray);
}

.page-faq .faq-symptom__item h3 {
  margin: 0;
  font-size: 17px;
  line-height: 1.45;
  color: var(--mist);
}

.page-faq .faq-symptom__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--violet-gray);
}

.page-faq .faq-symptom__jump {
  justify-self: start;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 2px;
  transition: color 180ms var(--ease-hard), border-color 180ms var(--ease-hard);
}

.page-faq .faq-symptom__jump:hover,
.page-faq .faq-symptom__jump:focus-visible {
  color: var(--magenta);
  border-color: var(--line-magenta);
}

.page-faq .faq-symptom__figure {
  min-width: 0;
}

/* ---------- 四步关卡 ---------- */
.page-faq .faq-step {
  position: relative;
  margin: 0 0 14px;
  background: var(--indigo);
  border: 2px solid var(--line);
  overflow: hidden;
  transition: border-color 220ms var(--ease-hard), background 220ms var(--ease-hard);
}

.page-faq .faq-step::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 26px;
  height: 26px;
  background: var(--midnight);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-faq .faq-step:hover {
  border-color: var(--line-magenta);
}

.page-faq .faq-step[open] {
  background: linear-gradient(150deg, var(--violet) 0%, var(--indigo) 62%);
  border-color: var(--cyan);
}

.page-faq .faq-step__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 20px;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-step__num {
  flex: 0 0 auto;
  font-size: clamp(28px, 4.4vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-faq .faq-step[open] .faq-step__num {
  color: var(--green);
}

.page-faq .faq-step__meta {
  display: grid;
  gap: 4px;
  min-width: 0;
  flex: 1 1 auto;
}

.page-faq .faq-step__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.25;
  color: var(--mist);
}

.page-faq .faq-step__brief {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--violet-gray);
}

.page-faq .faq-step__cue {
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  margin-left: auto;
  border-right: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
  transform: translateY(-3px) rotate(45deg);
  transition: transform 220ms var(--ease-hard);
}

.page-faq .faq-step[open] .faq-step__cue {
  transform: translateY(1px) rotate(225deg);
}

.page-faq .faq-step__body {
  padding: 0 20px 22px;
}

.page-faq .faq-step__rows {
  margin: 0;
  display: grid;
}

.page-faq .faq-step__row {
  display: grid;
  gap: 4px;
  padding: 12px 0;
  border-top: 1px dashed var(--line-soft);
}

.page-faq .faq-step__row dt {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.12em;
  color: var(--yellow);
}

.page-faq .faq-step__row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--mist);
  opacity: .9;
}

.page-faq .faq-step__figure {
  margin-top: 18px;
}

/* ---------- 报错对照 ---------- */
.page-faq .faq-errors {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: minmax(0, 1fr);
}

.page-faq .faq-error {
  display: grid;
  gap: 10px;
  padding: 16px 18px;
  background: var(--charcoal);
  border: 1px solid var(--line-soft);
  border-top: 3px solid var(--line);
}

.page-faq .faq-error__code {
  display: block;
  padding: 8px 12px;
  background: var(--faq-deep);
  border-left: 3px solid var(--yellow);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--yellow);
  overflow-wrap: anywhere;
}

.page-faq .faq-error__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--mist);
  opacity: .88;
}

.page-faq .faq-error__tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--magenta);
}

.page-faq .faq-errors__note {
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding-left: 16px;
  border-left: 3px solid var(--magenta);
  font-size: 15px;
  line-height: 1.76;
  color: var(--violet-gray);
}

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

.page-faq .faq-errors__note a:hover,
.page-faq .faq-errors__note a:focus-visible {
  color: var(--magenta);
  border-color: var(--line-magenta);
}

/* ---------- 备选路径 ---------- */
.page-faq .faq-alt__list {
  display: grid;
  gap: var(--faq-gap);
  grid-template-columns: minmax(0, 1fr);
}

.page-faq .faq-alt__card {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: var(--faq-pad);
  background: var(--indigo);
  border: 2px solid var(--line);
  border-bottom: 6px solid var(--magenta);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-alt__card:nth-child(2) {
  border-bottom-color: var(--cyan);
}

.page-faq .faq-alt__card:nth-child(3) {
  border-bottom-color: var(--yellow);
}

.page-faq .faq-alt__tag {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--violet-gray);
}

.page-faq .faq-alt__card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 19px;
  line-height: 1.34;
  color: var(--mist);
}

.page-faq .faq-alt__card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--violet-gray);
}

.page-faq .faq-alt__btn {
  justify-self: start;
  margin-top: 6px;
}

/* ---------- 手机端 ---------- */
.page-faq .faq-mobile__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-gap);
  align-items: start;
}

.page-faq .faq-mobile__text h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.2vw, 40px);
  line-height: 1.16;
  color: var(--mist);
}

.page-faq .faq-mobile__text p {
  margin: 16px 0 0;
  max-width: 38em;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--violet-gray);
}

.page-faq .faq-mobile__text .cluster {
  margin-top: 24px;
}

.page-faq .faq-mobile__panel {
  background: var(--charcoal);
}

.page-faq .faq-mobile__panel-title {
  margin: 0 0 14px;
  font-size: 12.5px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-faq .faq-mobile__facts {
  margin: 0;
  display: grid;
  gap: 14px;
}

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

.page-faq .faq-mobile__facts > div:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-faq .faq-mobile__facts dt {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--yellow);
}

.page-faq .faq-mobile__facts dd {
  margin: 5px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
  opacity: .88;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-step__row {
    grid-template-columns: 116px minmax(0, 1fr);
    gap: 18px;
    align-items: start;
  }

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

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.7fr) minmax(210px, 0.82fr);
    gap: clamp(24px, 3vw, 48px);
  }

  .page-faq .faq-rail {
    margin-top: 46px;
  }

  .page-faq .faq-symptom__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  }

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

  .page-faq .faq-alt__card:nth-child(2) {
    transform: translateY(24px);
  }

  .page-faq .faq-mobile__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    gap: clamp(24px, 3.4vw, 52px);
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-errors {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-step,
  .page-faq .faq-step__cue,
  .page-faq .faq-rail__list a,
  .page-faq .faq-symptom__jump {
    transition: none;
  }

  .page-faq .faq-alt__card:nth-child(2) {
    transform: none;
  }
}