.page-faq {
  --faq-line: #38524A;
  color: var(--text);
  padding-bottom: clamp(36px, 7vw, 88px);
}

.page-faq .breadcrumbs {
  margin: clamp(14px, 2.4vw, 26px) 0 clamp(12px, 2vw, 20px);
}

/* ---------- 首屏框景 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(22px, 4.6vw, 58px) clamp(18px, 4vw, 56px) clamp(24px, 4vw, 46px);
  border: 1px solid var(--faq-line);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(198, 255, 74, 0.10), transparent 62%),
    linear-gradient(180deg, rgba(56, 82, 74, 0.30), rgba(11, 31, 26, 0) 55%),
    var(--ink);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 8px;
  background: repeating-linear-gradient(to bottom, var(--faq-line) 0 1px, transparent 1px 12px);
  opacity: 0.9;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -36px;
  top: -36px;
  width: 168px;
  height: 168px;
  border: 1px solid var(--faq-line);
  border-radius: 50%;
  opacity: 0.55;
}

.page-faq .faq-hero .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-faq .faq-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 5.2vw, 60px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  max-width: 17em;
}

.page-faq .faq-lede {
  margin: clamp(14px, 2.2vw, 22px) 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.55vw, 17.5px);
  line-height: 1.78;
  color: var(--text);
  opacity: 0.92;
}

.page-faq .faq-hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(18px, 3vw, 28px) 0 0;
}

.page-faq .faq-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(22px, 3.6vw, 36px);
  background: var(--faq-line);
  border: 1px solid var(--faq-line);
}

.page-faq .faq-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px 16px;
  background: var(--panel);
}

.page-faq .faq-stat-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(20px, 2.8vw, 28px);
  line-height: 1;
  color: var(--lime);
}

.page-faq .faq-stat-unit {
  margin-left: 4px;
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-faq .faq-stat-label {
  font-size: 12px;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 章节节奏 ---------- */
.page-faq > .container > section + section {
  margin-top: clamp(38px, 6vw, 76px);
}

.page-faq .section-head {
  max-width: 68ch;
}

.page-faq .section-head .eyebrow {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-faq .section-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.4vw, 42px);
  line-height: 1.18;
  letter-spacing: -0.015em;
}

.page-faq .faq-sub {
  margin: 12px 0 0;
  max-width: 60ch;
  font-size: clamp(14px, 1.5vw, 16.5px);
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 图片外框 ---------- */
.page-faq .shot {
  margin: 0;
  padding: 10px;
  border: 1px solid var(--faq-line);
  background: var(--panel);
}

.page-faq .shot img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--faq-line);
}

.page-faq .shot figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.03em;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 四步流程 ---------- */
.page-faq .faq-flow-wrap {
  display: grid;
  gap: clamp(16px, 3vw, 30px);
  margin-top: clamp(20px, 3vw, 32px);
}

.page-faq .flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--faq-line);
  border: 1px solid var(--faq-line);
  counter-reset: step;
}

.page-faq .flow > li {
  counter-increment: step;
  position: relative;
  padding: 18px 18px 18px 68px;
  background: var(--panel);
  transition: background 0.25s var(--ease);
}

.page-faq .flow > li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 18px;
  top: 19px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--lime);
}

.page-faq .flow > li:hover {
  background: rgba(56, 82, 74, 0.20);
}

.page-faq .flow strong {
  display: block;
  margin-bottom: 5px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
}

.page-faq .flow p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 问答区 ---------- */
.page-faq .qa-layout {
  display: grid;
  gap: clamp(16px, 3vw, 32px);
  margin-top: clamp(20px, 3vw, 32px);
}

.page-faq .qa-index {
  padding: 16px;
  border: 1px solid var(--faq-line);
  background: rgba(56, 82, 74, 0.12);
}

.page-faq .qa-index-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-faq .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-faq .filter-btn {
  appearance: none;
  -webkit-appearance: none;
  padding: 9px 12px;
  font-family: var(--font-body);
  font-size: 12.5px;
  line-height: 1;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--faq-line);
  border-radius: var(--r-sm);
  cursor: pointer;
  transition: color 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .filter-btn:hover {
  color: var(--text);
  border-color: var(--muted);
}

.page-faq .filter-btn[aria-pressed="true"],
.page-faq .filter-btn.is-active {
  color: var(--ink);
  background: var(--lime);
  border-color: var(--lime);
  font-weight: 700;
}

.page-faq .filter-btn:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

.page-faq .qa-index-note {
  margin: 14px 0 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .qa-list {
  display: grid;
  gap: 8px;
  min-width: 0;
}

.page-faq .qa-item {
  background: var(--panel);
  border: 1px solid var(--faq-line);
  border-left: 3px solid var(--faq-line);
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-faq .qa-item[open] {
  border-left-color: var(--lime);
  background: rgba(56, 82, 74, 0.16);
}

.page-faq .qa-item[hidden] {
  display: none !important;
}

.page-faq .qa-item summary {
  position: relative;
  display: block;
  padding: 15px 46px 15px 16px;
  list-style: none;
  cursor: pointer;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.6;
  color: var(--text);
}

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

.page-faq .qa-item summary::marker {
  content: "";
}

.page-faq .qa-item summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--lime);
}

.page-faq .qa-item[open] summary::after {
  content: "–";
}

.page-faq .qa-item summary:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: -3px;
}

.page-faq .qa-answer {
  margin: 0 16px;
  padding: 12px 0 16px;
  border-top: 1px dashed var(--faq-line);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .qa-answer p {
  margin: 0 0 8px;
}

.page-faq .qa-answer p:last-child {
  margin-bottom: 0;
}

.page-faq .qa-answer a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 设备适配 ---------- */
.page-faq .faq-device-wrap {
  display: grid;
  gap: clamp(16px, 3vw, 30px);
  margin-top: clamp(20px, 3vw, 32px);
}

.page-faq .device-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--faq-line);
  border: 1px solid var(--faq-line);
}

.page-faq .device-list li {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  background: var(--panel);
}

.page-faq .device-key {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-faq .device-val {
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 故障自检 ---------- */
.page-faq .checklist {
  display: grid;
  gap: 1px;
  margin-top: clamp(20px, 3vw, 32px);
  background: var(--faq-line);
  border: 1px solid var(--faq-line);
  counter-reset: chk;
}

.page-faq .check-item {
  counter-increment: chk;
  position: relative;
  padding: 18px 18px 20px;
  background: var(--panel);
}

.page-faq .check-item::before {
  content: counter(chk, decimal-leading-zero);
  position: absolute;
  left: 18px;
  top: 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-faq .check-item h3 {
  margin: 0 0 8px;
  padding-left: 30px;
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--text);
}

.page-faq .check-item p {
  margin: 0;
  padding-left: 30px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 联系支持 ---------- */
.page-faq .faq-contact {
  padding: clamp(22px, 4vw, 46px);
  border: 1px solid var(--structure);
}

.page-faq .faq-contact .eyebrow {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #8a6f52;
}

.page-faq .faq-contact h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.4vw, 40px);
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: var(--brown);
}

.page-faq .faq-contact > p {
  margin: 0 0 22px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: #4a3d31;
}

.page-faq .faq-contact-grid {
  display: grid;
  gap: 1px;
  background: rgba(36, 28, 22, 0.22);
  border: 1px solid rgba(36, 28, 22, 0.22);
}

.page-faq .faq-contact-cell {
  display: grid;
  gap: 6px;
  padding: 14px 16px;
  background: var(--paper);
}

.page-faq .faq-contact-key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #7a6a58;
}

.page-faq .faq-contact-val {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--brown);
  word-break: break-word;
}

.page-faq .faq-contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 24px 0 0;
}

.page-faq .faq-privacy-link {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .faq-privacy-link a {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-faq .faq-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-faq .faq-flow-wrap {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .qa-layout {
    grid-template-columns: 216px minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .qa-index {
    position: sticky;
    top: calc(var(--bar-h) + 22px);
  }

  .page-faq .faq-device-wrap {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .page-faq .qa-layout {
    grid-template-columns: 236px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .filter-btn,
  .page-faq .qa-item,
  .page-faq .flow > li {
    transition: none;
  }
}