.page-faq {
  --faq-rail: 252px;
  display: block;
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-faq .crumb-sep {
  margin: 0 8px;
  color: var(--line);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  margin-top: clamp(14px, 3vw, 24px);
  padding: clamp(26px, 5vw, 52px) 0 clamp(24px, 4vw, 40px);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -60px;
  top: -30px;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, rgba(11, 95, 255, .16), rgba(11, 95, 255, 0) 66%);
  pointer-events: none;
}

.page-faq .faq-hero .container {
  position: relative;
  z-index: 1;
}

.page-faq h1 {
  margin: 12px 0 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 5.6vw, 54px);
  line-height: 1.06;
  letter-spacing: .01em;
  color: var(--ink);
}

.page-faq .faq-hero-lede {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.85;
  color: var(--graphite);
}

.page-faq .hero-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .hero-jump a {
  display: inline-block;
  padding: 7px 15px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: var(--card);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--graphite);
  text-decoration: none;
  transition: color .2s ease-out, border-color .2s ease-out, transform .2s ease-out;
}

.page-faq .hero-jump a:hover {
  color: var(--blue);
  border-color: var(--blue);
  transform: translateY(-1px);
}

/* ---------- 侧栏 + 正文 ---------- */
.page-faq .rail-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
  margin-top: clamp(28px, 5vw, 52px);
}

.page-faq .rail-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--graphite);
}

.page-faq .rail-link {
  display: block;
  padding: 9px 12px 9px 14px;
  border-left: 2px solid var(--line);
  font-size: 14.5px;
  line-height: 1.5;
  color: var(--graphite);
  text-decoration: none;
  transition: color .2s ease-out, border-color .2s ease-out, background .2s ease-out;
}

.page-faq .rail-link:hover {
  color: var(--blue);
  border-left-color: var(--blue);
}

.page-faq .rail-link.is-active,
.page-faq .rail-link[aria-current="true"],
.page-faq .rail-link[aria-current="location"] {
  color: var(--ink);
  font-weight: 700;
  border-left-color: var(--orange);
  background: linear-gradient(90deg, var(--orange-soft), rgba(255, 227, 210, 0) 88%);
}

.page-faq .rail-contact {
  margin-top: 24px;
  padding: 18px;
  border-radius: var(--radius-md);
  background: var(--ink);
}

.page-faq .rail-contact p {
  margin: 0;
}

.page-faq .rail-contact-title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--orange);
}

.page-faq .rail-contact-note {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, .76);
}

.page-faq .rail-contact .btn {
  margin-top: 14px;
}

/* ---------- 通用章节 ---------- */
.page-faq .faq-section + .faq-section,
.page-faq .faq-section + .faq-band,
.page-faq .faq-band + .faq-section {
  margin-top: clamp(44px, 6.5vw, 80px);
}

.page-faq .section-head {
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-faq .faq-section h2,
.page-faq .faq-band h2 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 36px);
  line-height: 1.14;
  color: var(--ink);
}

.page-faq .faq-section .section-lede,
.page-faq .faq-band .section-lede {
  margin: 12px 0 0;
  max-width: 64ch;
  font-size: 16.5px;
  line-height: 1.82;
  color: var(--graphite);
}

/* ---------- 分类抽屉 ---------- */
.page-faq .doc-drawers {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-faq .doc-drawer {
  display: flex;
  flex-direction: column;
  padding: 20px 18px 18px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--blue);
  border-radius: var(--radius-md);
  background: var(--card);
  box-shadow: var(--shadow-soft);
  transition: transform .24s ease-out, box-shadow .24s ease-out;
}

.page-faq .doc-drawer:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-island);
}

.page-faq .doc-drawer:nth-child(2) { border-top-color: var(--orange); }
.page-faq .doc-drawer:nth-child(3) { border-top-color: var(--teal); }
.page-faq .doc-drawer:nth-child(4) { border-top-color: var(--blue-deep); }

.page-faq .drawer-tag {
  align-self: flex-start;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: var(--blue-soft);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--blue-deep);
}

.page-faq .drawer-num {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 34px;
  line-height: 1;
  color: var(--ink);
}

.page-faq .drawer-num span {
  margin-left: 4px;
  font-size: 13px;
  font-weight: 500;
  color: var(--graphite);
}

.page-faq .drawer-desc {
  margin: 12px 0 0;
  flex: 1 1 auto;
  font-size: 15px;
  line-height: 1.75;
  color: var(--graphite);
}

.page-faq .drawer-link {
  margin-top: 16px;
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.page-faq .drawer-link:hover { color: var(--blue-deep); }

/* ---------- 步骤轨道 ---------- */
.page-faq .step-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: faqstep;
}

.page-faq .step-item {
  position: relative;
  counter-increment: faqstep;
  padding: 0 0 26px 58px;
}

.page-faq .step-item:last-child { padding-bottom: 0; }

.page-faq .step-item::before {
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: -2px;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: var(--blue);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
}

.page-faq .step-item::after {
  content: "";
  position: absolute;
  left: 19px;
  top: 44px;
  bottom: 4px;
  width: 2px;
  background: repeating-linear-gradient(180deg, var(--line) 0 6px, rgba(230, 233, 239, 0) 6px 12px);
}

.page-faq .step-item:last-child::after { display: none; }

.page-faq .step-title {
  margin: 6px 0 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

.page-faq .step-body {
  margin: 6px 0 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--graphite);
}

/* ---------- 图版 ---------- */
.page-faq .faq-figure {
  margin: clamp(24px, 4vw, 36px) 0 0;
}

.page-faq .faq-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: .02em;
  color: var(--graphite);
}

.page-faq .faq-figure img {
  max-width: 100%;
  height: auto;
}

/* ---------- 差异速查标签页 ---------- */
.page-faq .diff-tabs {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--card);
  box-shadow: var(--shadow-soft);
}

.page-faq .diff-tabs .tab-list {
  display: flex;
  gap: 4px;
  padding: 8px;
  overflow-x: auto;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

.page-faq .diff-tabs .tab-btn {
  flex: 0 0 auto;
  padding: 10px 16px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  background: transparent;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .03em;
  white-space: nowrap;
  color: var(--graphite);
  cursor: pointer;
  transition: color .2s ease-out, background .2s ease-out, border-color .2s ease-out;
}

.page-faq .diff-tabs .tab-btn:hover { color: var(--blue); }

.page-faq .diff-tabs .tab-btn[aria-selected="true"],
.page-faq .diff-tabs .tab-btn.is-active {
  background: var(--ink);
  border-color: var(--ink);
  color: #fff;
}

.page-faq .diff-tabs .tab-panel {
  padding: clamp(20px, 3vw, 30px);
}

.page-faq .panel-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 22px;
  line-height: 1.3;
  color: var(--ink);
}

.page-faq .panel-lede {
  margin: 8px 0 0;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--graphite);
}

.page-faq .panel-steps {
  margin: 16px 0 0;
  padding-left: 20px;
}

.page-faq .panel-steps li {
  margin-bottom: 10px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--graphite);
}

.page-faq .panel-steps li::marker {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--blue);
}

.page-faq .diff-tip {
  margin: 18px 0 0;
  padding: 12px 16px;
  border-left: 3px solid var(--orange);
  border-radius: var(--radius-sm);
  background: var(--orange-soft);
  font-size: 15px;
  line-height: 1.75;
  color: var(--graphite);
}

/* ---------- 费用与回访深色带 ---------- */
.page-faq .faq-band {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4vw, 44px);
  border-radius: var(--radius-lg);
  background: var(--ink);
}

.page-faq .faq-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(11, 95, 255, .16) 1px, rgba(11, 95, 255, 0) 1px),
    linear-gradient(90deg, rgba(11, 95, 255, .16) 1px, rgba(11, 95, 255, 0) 1px);
  background-size: 52px 52px;
  pointer-events: none;
}

.page-faq .band-inner {
  position: relative;
  z-index: 1;
}

.page-faq .faq-band h2 { color: #fff; }
.page-faq .faq-band .section-lede { color: rgba(255, 255, 255, .78); }
.page-faq .faq-band .eyebrow { color: rgba(255, 255, 255, .68); }

.page-faq .cycle-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 26px;
}

.page-faq .cycle-card {
  padding: 20px;
  border: 1px solid rgba(255, 255, 255, .14);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, .06);
}

.page-faq .cycle-card h3 {
  margin: 10px 0 0;
  font-size: 17px;
  font-weight: 700;
  color: #fff;
}

.page-faq .cycle-card p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(255, 255, 255, .76);
}

.page-faq .cycle-num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 32px;
  line-height: 1;
  color: var(--orange);
}

.page-faq .cycle-num span {
  margin-left: 4px;
  font-size: 13px;
  font-weight: 500;
  color: rgba(255, 255, 255, .66);
}

.page-faq .cycle-card--accent {
  border-color: rgba(255, 107, 26, .48);
  background: rgba(255, 107, 26, .12);
}

.page-faq .band-foot {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, .16);
}

.page-faq .band-note {
  margin: 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(255, 255, 255, .78);
}

.page-faq .band-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.page-faq .band-ghost {
  color: #fff;
  border-color: rgba(255, 255, 255, .34);
}

.page-faq .band-ghost:hover {
  color: var(--ink);
  background: #fff;
  border-color: #fff;
}

/* ---------- 安装与调试 ---------- */
.page-faq .install-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-faq .install-card {
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--card);
  box-shadow: var(--shadow-soft);
}

.page-faq .install-card:first-child {
  border-left: 3px solid var(--teal);
}

.page-faq .install-card:last-child {
  border-left: 3px solid var(--blue);
}

.page-faq .install-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  line-height: 1.3;
  color: var(--ink);
}

.page-faq .prep-list,
.page-faq .onsite-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .prep-list li {
  position: relative;
  padding: 9px 0 9px 26px;
  border-bottom: 1px dashed var(--line);
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--graphite);
}

.page-faq .prep-list li:last-child { border-bottom: 0; }

.page-faq .prep-list li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 18px;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--teal);
}

.page-faq .onsite-list { counter-reset: onsite; }

.page-faq .onsite-list li {
  position: relative;
  counter-increment: onsite;
  padding: 9px 0 9px 34px;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--graphite);
}

.page-faq .onsite-list li::before {
  content: counter(onsite);
  position: absolute;
  left: 0;
  top: 11px;
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border-radius: 6px;
  background: var(--blue-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--blue-deep);
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa-list {
  border-top: 1px solid var(--line);
}

.page-faq .qa-list .fold {
  border-bottom: 1px solid var(--line);
}

.page-faq .qa-list .fold-summary {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px 4px;
  font-size: 16.5px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
  transition: color .2s ease-out;
}

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

.page-faq .qa-list .fold-summary::before {
  content: "Q";
  flex: 0 0 auto;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border: 1px solid var(--blue);
  border-radius: 7px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--blue);
  transition: background .2s ease-out, border-color .2s ease-out, color .2s ease-out;
}

.page-faq .qa-list .fold-summary:hover { color: var(--blue); }

.page-faq .qa-list .fold[open] .fold-summary::before {
  background: var(--orange);
  border-color: var(--orange);
  color: #fff;
}

.page-faq .qa-list .fold-body {
  padding: 0 4px 22px 44px;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--graphite);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-faq .doc-drawers {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-faq .cycle-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-faq .install-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 980px) {
  .page-faq .rail-layout {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
  }

  .page-faq .rail-aside {
    position: sticky;
    top: calc(var(--header-h) + 20px);
  }
}

@media (min-width: 1180px) {
  .page-faq .doc-drawers {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1280px) {
  .page-faq .step-list {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }

  .page-faq .step-item {
    padding: 60px 0 0;
  }

  .page-faq .step-item::after {
    left: 48px;
    right: -20px;
    top: 19px;
    bottom: auto;
    width: auto;
    height: 2px;
    background: repeating-linear-gradient(90deg, var(--line) 0 6px, rgba(230, 233, 239, 0) 6px 12px);
  }

  .page-faq .step-body {
    font-size: 15px;
  }
}

@media (max-width: 560px) {
  .page-faq .qa-list .fold-body {
    padding-left: 4px;
  }

  .page-faq .faq-band {
    padding: 22px 18px;
  }
}