.page-faq {
  --faq-rail: 210px;
  --faq-color-line: var(--line-600);
  --faq-hairline: 1px solid var(--line-600);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  display: grid;
  gap: 30px;
  padding-block: 34px 58px;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan-400) 0%, var(--amber-400) 52%, rgba(59, 224, 209, 0) 100%);
  opacity: .65;
}

.page-faq .faq-hero h1 {
  margin: 12px 0 0;
  font-size: clamp(33px, 7.6vw, 66px);
  line-height: 1.14;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--paper-000);
  max-width: 15em;
}

.page-faq .faq-hero .lede {
  margin-top: 18px;
  max-width: 48ch;
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-faq .faq-hero__aside {
  display: grid;
  gap: 14px;
  align-content: end;
}

.page-faq .faq-hero .stamp {
  justify-self: start;
}

.page-faq .faq-hero__note {
  margin: 0;
  max-width: 36ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--slate-500);
}

/* ---------- 布局与侧边定位 ---------- */
.page-faq .faq-layout {
  display: grid;
  gap: 36px;
  padding-block: 44px 100px;
}

.page-faq .faq-toc__title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--slate-500);
}

.page-faq .faq-toc__list {
  display: flex;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-toc__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 15px;
  border: var(--faq-hairline);
  border-radius: var(--radius-pill);
  font-size: 14px;
  color: var(--paper-400);
  text-decoration: none;
  transition: color .2s var(--ease), background-color .2s var(--ease), border-color .2s var(--ease);
}

.page-faq .faq-toc__link .mono {
  font-size: 11px;
  color: var(--slate-500);
}

.page-faq .faq-toc__link:hover {
  color: var(--paper-000);
  border-color: var(--cyan-700);
}

.page-faq .faq-toc__link.is-active {
  color: var(--void-000);
  background: var(--cyan-400);
  border-color: var(--cyan-400);
}

.page-faq .faq-toc__link.is-active .mono {
  color: var(--void-000);
}

/* ---------- 章节节奏 ---------- */
.page-faq .faq-body > .section + .section {
  margin-top: 66px;
  padding-top: 58px;
  border-top: var(--faq-hairline);
}

.page-faq .faq-body .section--band {
  margin-inline: calc(-1 * clamp(14px, 4vw, 34px));
  padding-inline: clamp(14px, 4vw, 34px);
  padding-bottom: 58px;
  border-radius: var(--radius-lg);
  background: var(--ink-800);
}

.page-faq .section-head {
  max-width: 62ch;
}

.page-faq .section-head h2 {
  margin: 10px 0 0;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -0.015em;
  color: var(--paper-000);
}

.page-faq .section-head .lede {
  margin-top: 14px;
}

/* ---------- 步骤进度条 ---------- */
.page-faq .steps {
  list-style: none;
  margin: 38px 0 0;
  padding: 0;
  display: grid;
  gap: 26px;
}

.page-faq .step {
  position: relative;

  padding-left: 26px;
  border-left: 2px solid var(--faq-color-line);
}

.page-faq .step::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 7px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--void-000);
  border: 2px solid var(--slate-500);
}

.page-faq .step.is-current {
  border-left-color: var(--cyan-700);
}

.page-faq .step.is-current::before {
  background: var(--cyan-400);
  border-color: var(--cyan-400);
  box-shadow: 0 0 0 6px rgba(59, 224, 209, .14);
}

.page-faq .step__no {
  display: block;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--slate-500);
}

.page-faq .step.is-current .step__no {
  color: var(--cyan-400);
}

.page-faq .step__title {
  margin: 8px 0 0;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper-000);
}

.page-faq .step__text {
  margin: 10px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--paper-400);
}

.page-faq .copy-btn {
  margin-top: 14px;
  padding: 6px 14px;
  border: var(--faq-hairline);
  border-radius: var(--radius-pill);
  background: none;
  color: var(--paper-400);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  cursor: pointer;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-faq .copy-btn:hover {
  color: var(--cyan-400);
  border-color: var(--cyan-700);
}

.page-faq .copy-btn--solid {
  border-color: var(--cyan-700);
  background: var(--cyan-700);
  color: var(--paper-000);
}

.page-faq .copy-btn--solid:hover {
  background: var(--cyan-400);
  border-color: var(--cyan-400);
  color: var(--void-000);
}

/* ---------- 图片 ---------- */
.page-faq .figure {
  margin: 40px 0 0;
}

.page-faq .figure__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.page-faq .figure__caption {
  margin-top: 12px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--slate-500);
}

/* ---------- 设备清单 ---------- */
.page-faq .device-list {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
}

.page-faq .device {
  display: grid;
  gap: 12px;
  padding: 22px 0;
  border-top: var(--faq-hairline);
}

.page-faq .device:last-child {
  border-bottom: var(--faq-hairline);
}

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

.page-faq .device__body p {
  margin: 0 0 8px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--paper-400);
}

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

.page-faq .device__label {
  display: inline-block;
  min-width: 3.6em;
  margin-right: 8px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--slate-500);
}

/* ---------- 排查清单 ---------- */
.page-faq .checklist {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 4px;
  counter-reset: check;
}

.page-faq .checklist__item {
  position: relative;
  padding: 22px 0 22px 46px;
  border-top: var(--faq-hairline);
}

.page-faq .checklist__item:last-child {
  border-bottom: var(--faq-hairline);
}

.page-faq .checklist__no {
  position: absolute;
  left: 0;
  top: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1px solid var(--cyan-700);
  color: var(--cyan-400);
  font-size: 12px;
}

.page-faq .checklist__title {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper-000);
}

.page-faq .checklist__item p {
  margin: 10px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--paper-400);
}

.page-faq .note-band {
  margin: 30px 0 0;
  padding: 18px 20px;
  border-left: 2px solid var(--amber-400);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: var(--amber-700);
  color: var(--paper-000);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 触发条件与重来顺序 ---------- */
.page-faq .split {
  display: grid;
  gap: 28px;
  margin-top: 34px;
}

.page-faq .split__col {
  padding-top: 20px;
  border-top: 2px solid var(--faq-color-line);
}

.page-faq .split__col--accent {
  border-top-color: var(--cyan-400);
}

.page-faq .split__title {
  margin: 0 0 16px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper-000);
}

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

.page-faq .dot-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--paper-400);
}

.page-faq .dot-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--slate-500);
}

.page-faq .split__col--accent .dot-list li::before {
  background: var(--cyan-400);
}

.page-faq .num-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-faq .num-list li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 10px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--paper-400);
}

.page-faq .num-list .mono {
  color: var(--cyan-400);
  font-size: 13px;
  padding-top: 3px;
}

.page-faq .section .prose {
  margin-top: 32px;
}

/* ---------- 大屏卡点 ---------- */
.page-faq .pins {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-faq .pin {
  padding: 20px 22px;
  border-left: 2px solid var(--amber-400);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: var(--ink-800);
}

.page-faq .pin__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
}

.page-faq .pin__title {
  font-size: 17px;
  font-weight: 700;
  color: var(--paper-000);
}

.page-faq .pin__text {
  margin: 12px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--paper-400);
}

/* ---------- 问答折叠 ---------- */
.page-faq .qa-group {
  margin-top: 42px;
}

.page-faq .qa-group__title {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 6px;
  font-size: 19px;
  font-weight: 700;
  color: var(--paper-000);
}

.page-faq .qa-group__title .mono {
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--amber-400);
}

.page-faq .qa {
  border-top: var(--faq-hairline);
}

.page-faq .qa:last-child {
  border-bottom: var(--faq-hairline);
}

.page-faq .qa > summary {
  position: relative;
  display: flex;
  gap: 16px;
  padding: 20px 40px 20px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .qa > summary::after {
  content: "+";
  position: absolute;
  right: 8px;
  top: 18px;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--slate-500);
  transition: color .2s var(--ease);
}

.page-faq .qa[open] > summary::after {
  content: "−";
  color: var(--cyan-400);
}

.page-faq .qa__no {
  flex: none;
  padding-top: 4px;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--cyan-400);
}

.page-faq .qa__q {
  font-size: 16.5px;
  font-weight: 600;
  line-height: 1.65;
  color: var(--paper-000);
}

.page-faq .qa__a {
  padding: 0 40px 24px 38px;
}

.page-faq .qa__a p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--paper-400);
}

/* ---------- 人工支持 ---------- */
.page-faq .assist {
  display: grid;
  gap: 30px;
  margin-top: 34px;
}

.page-faq .assist__col {
  padding-top: 20px;
  border-top: 2px solid var(--faq-color-line);
}

.page-faq .assist__col--contact {
  border-top-color: var(--amber-400);
}

.page-faq .assist__line {
  margin: 0 0 10px;
  font-size: 17px;
  line-height: 1.7;
  color: var(--paper-000);
  word-break: break-word;
}

.page-faq .assist__label {
  display: inline-block;
  min-width: 4.4em;
  margin-right: 10px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--slate-500);
}

.page-faq .assist__meta {
  margin: 14px 0 18px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--paper-400);
}

.page-faq .assist__foot {
  margin: 34px 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--slate-500);
}

/* ---------- 宽屏 ---------- */
@media (min-width: 700px) {
  .page-faq .faq-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-faq .device {
    grid-template-columns: 128px minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .split {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 44px;
  }

  .page-faq .assist {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 44px;
  }
}

@media (min-width: 820px) {
  .page-faq .steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
  }

  .page-faq .step {
    padding: 26px 24px 0 0;
    border-left: 0;
    border-top: 2px solid var(--faq-color-line);
  }

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

  .page-faq .step::before {
    left: 0;
    top: -7px;
  }

  .page-faq .step.is-current {
    border-top-color: var(--cyan-400);
  }
}

@media (min-width: 1040px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1fr) minmax(240px, 300px);
    align-items: end;
    gap: 56px;
    padding-block: 48px 72px;
  }

  .page-faq .faq-hero__aside {
    justify-items: end;
    text-align: right;
  }

  .page-faq .faq-hero .stamp {
    justify-self: end;
  }

  .page-faq .faq-hero__note {
    max-width: 30ch;
  }

  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: 72px;
    padding-block: 56px 120px;
  }

  .page-faq .faq-toc {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }

  .page-faq .faq-toc__list {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-toc__link {
    width: 100%;
    border-color: transparent;
    padding: 8px 12px;
  }

  .page-faq .qa > summary {
    padding-right: 56px;
  }

  .page-faq .qa__a {
    padding: 0 56px 26px 38px;
    max-width: 72ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-toc__link,
  .page-faq .copy-btn,
  .page-faq .qa > summary::after {
    transition: none;
  }
}