.page-faq {
  --faq-line: 2px solid var(--navy);
  --faq-shadow: 4px 4px 0 var(--navy);
  --faq-shadow-lg: 6px 6px 0 var(--navy);
  background: var(--ivory);
  color: var(--ink);
  font-family: var(--font-sans);
  overflow-x: clip;
}

.page-faq .container {
  width: 100%;
  max-width: 1240px;
  margin-inline: auto;
  padding-inline: var(--pad);
}

/* ---------- 刊头首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--royal);
  color: var(--white);
  padding: clamp(1.75rem, 5vw, 3rem) 0 clamp(2.75rem, 8vw, 5rem);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -14%;
  width: 54%;
  height: 175%;
  background: var(--navy);
  transform: rotate(13deg);
  z-index: -2;
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: -12%;
  right: -30%;
  width: 32%;
  height: 150%;
  background: linear-gradient(180deg, var(--gold-hi), var(--gold) 52%, var(--royal));
  transform: rotate(13deg);
  opacity: .9;
  z-index: -1;
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.page-faq .faq-hero .eyebrow {
  color: var(--gold-hi);
}

.page-faq .faq-hero__title {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(1.7rem, 4.6vw, 3.1rem);
  line-height: 1.18;
  letter-spacing: -.01em;
  margin: .7rem 0 1rem;
  text-wrap: balance;
}

.page-faq .faq-hero__lede {
  font-size: clamp(.9375rem, 1.4vw, 1.0625rem);
  line-height: 1.9;
  color: rgba(255, 255, 255, .88);
  max-width: 62ch;
  margin: 0 0 1.4rem;
}

.page-faq .faq-hero__tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}

/* ---------- 通用章节头 ---------- */

.page-faq .section {
  padding: clamp(2.25rem, 6vw, 4.5rem) 0;
}

.page-faq .section--tight {
  padding: clamp(1.5rem, 4vw, 2.5rem) 0;
}

.page-faq .faq-sectionhead {
  max-width: 720px;
}

.page-faq .faq-sectionhead h2 {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(1.35rem, 3.2vw, 2.1rem);
  line-height: 1.3;
  letter-spacing: -.005em;
  color: var(--navy);
  margin: .6rem 0 .8rem;
  text-wrap: balance;
}

.page-faq .faq-sectionhead__lede {
  font-size: .9375rem;
  line-height: 1.9;
  color: var(--gray);
  margin: 0;
}

.page-faq .faq-devices .faq-sectionhead h2,
.page-faq .faq-devices h2 {
  color: var(--white);
}

.page-faq .faq-devices .eyebrow {
  color: var(--gold-hi);
}

/* ---------- 三步自检 ---------- */

.page-faq .faq-checklist__figure {
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 0;
}

.page-faq .faq-checklist__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: var(--faq-line);
  box-shadow: var(--faq-shadow);
  object-fit: cover;
  background: var(--navy);
}

.page-faq .faq-steps {
  list-style: none;
  margin: clamp(1.25rem, 3.5vw, 2rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gutter);
}

.page-faq .faq-step {
  position: relative;
  background: var(--white);
  border: var(--faq-line);
  box-shadow: var(--faq-shadow);
  transition: transform var(--t-base) var(--ease), box-shadow var(--t-base) var(--ease);
}

.page-faq .faq-step:hover {
  transform: translateY(-4px);
  box-shadow: var(--faq-shadow-lg);
}

.page-faq .faq-step__check {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.page-faq .faq-step__hit {
  display: block;
  min-height: 44px;
  padding: clamp(1.15rem, 3vw, 1.6rem);
  cursor: pointer;
}

.page-faq .faq-step__check:focus-visible + .faq-step__hit {
  outline: 3px solid var(--gold);
  outline-offset: 2px;
}

.page-faq .faq-step__check:checked + .faq-step__hit {
  background: #EAF6F2;
}

.page-faq .faq-step__check:checked + .faq-step__hit .faq-step__num {
  background: var(--teal);
  color: var(--white);
}

.page-faq .faq-step__num {
  display: inline-block;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(1.6rem, 4vw, 2.35rem);
  line-height: 1;
  letter-spacing: -.02em;
  padding: .16em .42em;
  margin-bottom: .85rem;
  background: var(--gold);
  color: var(--navy);
  border: 2px solid var(--navy);
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.page-faq .faq-step__title {
  display: block;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: 1.0625rem;
  line-height: 1.45;
  color: var(--navy);
  margin-bottom: .45rem;
}

.page-faq .faq-step__desc {
  display: block;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--ink);
}

/* ---------- 故障折叠卡 ---------- */

.page-faq .faq-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(.85rem, 2vw, 1.15rem);
  margin-top: clamp(1.5rem, 4vw, 2.35rem);
}

.page-faq .faq-card {
  background: var(--white);
  border: var(--faq-line);
  box-shadow: var(--faq-shadow);
  transition: box-shadow var(--t-base) var(--ease);
}

.page-faq .faq-card[open] {
  box-shadow: var(--faq-shadow-lg);
}

.page-faq .faq-card__q {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .55rem .8rem;
  min-height: 44px;
  padding: 1rem clamp(1rem, 3vw, 1.5rem);
  cursor: pointer;
  list-style: none;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--navy);
}

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

.page-faq .faq-card__q::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.375rem;
  line-height: 1;
  color: var(--gold);
}

.page-faq .faq-card[open] .faq-card__q::after {
  content: "–";
}

.page-faq .faq-card__q:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: -3px;
}

.page-faq .faq-card__qtext {
  flex: 1 1 12rem;
  min-width: 0;
}

.page-faq .faq-card__a {
  padding: 0 clamp(1rem, 3vw, 1.5rem) clamp(1.1rem, 3vw, 1.5rem);
  border-top: 1px dashed rgba(30, 58, 138, .3);
  margin-top: .2rem;
}

.page-faq .faq-card__intro {
  font-size: .875rem;
  line-height: 1.8;
  color: var(--gray);
  margin: 1rem 0 .85rem;
}

.page-faq .faq-card__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .8rem;
}

.page-faq .faq-card__list li {
  position: relative;
  padding-left: 1.6rem;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--ink);
}

.page-faq .faq-card__list li::before {
  content: "";
  position: absolute;
  left: .1rem;
  top: .62em;
  width: .6rem;
  height: .6rem;
  background: var(--gold);
  border: 1px solid var(--navy);
}

.page-faq .faq-verdict {
  margin: 1.1rem 0 0;
  padding: .7rem .9rem;
  background: rgba(178, 58, 47, .09);
  border-left: 4px solid var(--brick);
  font-size: .875rem;
  line-height: 1.8;
  color: var(--ink);
}

.page-faq .faq-verdict strong {
  color: var(--brick);
  font-weight: 700;
}

/* ---------- 设备适配 ---------- */

.page-faq .faq-devices {
  background: var(--navy);
  color: var(--white);
}

.page-faq .faq-devices__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: center;
}

.page-faq .faq-devices__lede {
  font-size: .9375rem;
  line-height: 1.9;
  color: rgba(255, 255, 255, .85);
  margin: .4rem 0 1.2rem;
  max-width: 56ch;
}

.page-faq .faq-range {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 2px solid var(--gold);
  background: rgba(255, 255, 255, .04);
}

.page-faq .faq-range__item {
  display: grid;
  gap: .3rem;
  padding: .85rem 1rem;
  text-align: center;
}

.page-faq .faq-range__item + .faq-range__item {
  border-left: 2px solid var(--gold);
}

.page-faq .faq-range__label {
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--gold-hi);
}

.page-faq .faq-range__value {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: 1.0625rem;
  color: var(--white);
}

.page-faq .faq-devices__note {
  margin: 1.1rem 0 0;
  font-size: .875rem;
  line-height: 1.85;
  color: rgba(255, 255, 255, .72);
  max-width: 60ch;
}

.page-faq .faq-devices__figure {
  margin: 0;
}

.page-faq .faq-devices__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 2px solid var(--gold);
  box-shadow: 6px 6px 0 var(--royal);
  object-fit: cover;
  background: var(--white);
}

/* ---------- 跟进处理 ---------- */

.page-faq .faq-followup__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1rem, 2.6vw, 1.5rem);
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
}

.page-faq .faq-followup__col {
  padding: clamp(1.25rem, 3vw, 1.9rem);
  background: var(--white);
  border: var(--faq-line);
  box-shadow: var(--faq-shadow);
}

.page-faq .faq-followup__col--dark {
  background: var(--royal);
  color: var(--white);
}

.page-faq .faq-followup__title {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: 1.0625rem;
  letter-spacing: .01em;
  color: var(--navy);
  margin: 0 0 1rem;
}

.page-faq .faq-followup__col--dark .faq-followup__title {
  color: var(--gold-hi);
}

.page-faq .faq-followup__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .8rem;
}

.page-faq .faq-followup__list li {
  position: relative;
  padding-left: 1.5rem;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--ink);
}

.page-faq .faq-followup__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: .55rem;
  height: .55rem;
  border: 2px solid var(--royal);
}

.page-faq .faq-followup__key {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .06em;
  color: var(--navy);
  background: rgba(201, 162, 39, .24);
  padding: .05rem .4rem;
  margin-right: .4rem;
}

.page-faq .faq-followup__timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.1rem;
}

.page-faq .faq-followup__timeline li {
  border-left: 2px solid var(--gold);
  padding-left: 1rem;
}

.page-faq .faq-followup__timeline p {
  margin: .5rem 0 0;
  font-size: .9375rem;
  line-height: 1.85;
  color: rgba(255, 255, 255, .86);
}

/* ---------- 页尾行动区 ---------- */

.page-faq .faq-foot {
  background: var(--ivory);
  border-top: var(--faq-line);
}

.page-faq .faq-foot__inner {
  display: grid;
  gap: 1.25rem;
  align-items: center;
}

.page-faq .faq-foot__text {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.9;
  color: var(--ink);
  max-width: 62ch;
}

.page-faq .faq-foot__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

/* ---------- 固定返回按钮 ---------- */

.page-faq .faq-return {
  position: fixed;
  right: clamp(.75rem, 3vw, 1.5rem);
  bottom: clamp(.75rem, 3vw, 1.5rem);
  z-index: 40;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: .6rem 1rem;
  background: var(--gold);
  color: var(--navy);
  border: 2px solid var(--navy);
  box-shadow: 3px 3px 0 var(--navy);
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .08em;
  text-decoration: none;
  transition: transform var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
}

.page-faq .faq-return:hover,
.page-faq .faq-return:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 var(--navy);
}

.page-faq .faq-return:focus-visible {
  outline: 3px solid var(--royal);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-faq .faq-steps {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-faq .faq-followup__grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-faq .faq-foot__inner {
    grid-template-columns: 1fr auto;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-devices__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .page-faq .faq-card__q {
    font-size: 1.0625rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-step,
  .page-faq .faq-card,
  .page-faq .faq-return {
    transition: none;
  }

  .page-faq .faq-step:hover,
  .page-faq .faq-return:hover {
    transform: none;
  }
}