.page-faq {
  --faq-index-w: 264px;
  --faq-rail-line: rgba(185, 214, 220, .35);
  --faq-ink-line: rgba(11, 21, 36, .12);
  display: block;
  background: var(--mist);
  color: var(--ink);
  padding-bottom: 104px;
}

.page-faq > .wrap {
  padding-block: 26px 0;
}

/* ---------- 首屏框景 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  margin-top: 20px;
  padding: 40px 26px 34px;
  background: var(--ink);
  color: var(--white);
  border: 3px solid var(--cyan);
  box-shadow: 9px 9px 0 var(--faq-ink-line);
  display: grid;
  gap: 30px;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: -30% -15%;
  background-image:
    radial-gradient(closest-side, rgba(23, 195, 201, .40), transparent 72%),
    radial-gradient(closest-side, rgba(226, 69, 47, .30), transparent 72%);
  background-size: 58% 78%, 50% 68%;
  background-position: 8% 18%, 92% 80%;
  background-repeat: no-repeat;
  animation: faq-drift 24s ease-in-out infinite alternate;
  pointer-events: none;
}

.page-faq .faq-hero-body,
.page-faq .faq-hero-aside {
  position: relative;
  z-index: 1;
}

.page-faq .faq-kicker {
  margin: 0 0 14px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--lemon);
}

.page-faq .faq-hero h1 {
  margin: 0 0 18px;
  font-size: clamp(30px, 6vw, 52px);
  line-height: 1.06;
  font-weight: 900;
  letter-spacing: -.02em;
}

.page-faq .faq-lead {
  margin: 0;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(255, 255, 255, .84);
}

.page-faq .faq-hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 30px;
  margin: 26px 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid rgba(185, 214, 220, .28);
}

.page-faq .faq-hero-facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 14px;
  color: rgba(255, 255, 255, .72);
}

.page-faq .faq-fact-num {
  font-size: 22px;
  font-weight: 700;
  color: var(--cyan);
}

.page-faq .faq-hero-aside {
  padding-left: 18px;
  border-left: 2px solid rgba(23, 195, 201, .55);
}

.page-faq .faq-hero-aside p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(255, 255, 255, .68);
}

.page-faq .faq-cta {
  display: inline-block;
  margin-top: 18px;
  padding: 11px 22px;
  background: var(--red);
  color: var(--white);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  border: 2px solid var(--red);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, .55);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .faq-cta:hover,
.page-faq .faq-cta:focus-visible {
  background: var(--red-deep);
  border-color: var(--red-deep);
  transform: translate(-2px, -2px);
  box-shadow: 7px 7px 0 rgba(0, 0, 0, .55);
}

/* ---------- 布局骨架 ---------- */

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-top: 44px;
  align-items: start;
}

.page-faq [id] {
  scroll-margin-top: 96px;
}

/* ---------- 分类索引 ---------- */

.page-faq .faq-index {
  padding: 20px 18px 22px;
  background: var(--ink-2);
  border: 2px solid var(--ink);
  border-left: 3px solid var(--cyan);
  box-shadow: 6px 6px 0 var(--faq-ink-line);
}

.page-faq .faq-index-title {
  margin: 0 0 12px;
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--lemon);
}

.page-faq .faq-index-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 0 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-index-list a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 2px;
  font-size: 14.5px;
  color: rgba(255, 255, 255, .80);
  text-decoration: none;
  border-bottom: 1px solid var(--faq-rail-line);
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.page-faq .faq-index-list a::before {
  content: "";
  flex: none;
  width: 6px;
  height: 6px;
  background: var(--slate);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

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

.page-faq .faq-index-list a:hover::before,
.page-faq .faq-index-list a:focus-visible::before {
  background: var(--lemon);
  box-shadow: 0 0 0 4px rgba(245, 226, 60, .18);
}

.page-faq .faq-index-num {
  font-size: 12.5px;
  color: var(--cyan);
}

.page-faq .faq-index-note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--faq-rail-line);
  font-size: 13px;
  line-height: 1.7;
  color: rgba(255, 255, 255, .55);
}

/* ---------- 内容区块 ---------- */

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

.page-faq .faq-block {
  position: relative;
  padding: 32px 0 6px;
  border-top: 2px solid var(--ink);
}

.page-faq .faq-block:first-child {
  border-top-color: var(--cyan);
}

.page-faq .faq-block-index {
  margin: 0 0 10px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--cyan-deep);
}

.page-faq .faq-block h2 {
  margin: 0 0 12px;
  font-size: clamp(21px, 3.4vw, 30px);
  line-height: 1.22;
  font-weight: 900;
  letter-spacing: -.02em;
}

.page-faq .faq-block-lead {
  margin: 0 0 26px;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--slate);
}

.page-faq .faq-block--support {
  border-top-color: var(--red);
}

/* ---------- 步骤引导 ---------- */

.page-faq .faq-steps-wrap {
  display: grid;
  gap: 28px;
}

.page-faq .faq-steps {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 4px;
}

.page-faq .faq-step {
  position: relative;
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 10px 16px;
  padding: 18px 0 20px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-step::after {
  content: "";
  position: absolute;
  left: 92px;
  right: 6%;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), transparent 78%);
  transform: rotate(-1.5deg);
  transform-origin: left center;
  opacity: .55;
}

.page-faq .faq-step:last-child {
  border-bottom-color: var(--ink);
}

.page-faq .faq-step:last-child::after {
  background: linear-gradient(90deg, var(--red), transparent 78%);
  opacity: .7;
}

.page-faq .faq-step-num {
  grid-row: span 2;
  font-size: clamp(46px, 7.6vw, 76px);
  line-height: .82;
  font-weight: 700;
  letter-spacing: -.08em;
  color: var(--cyan);
}

.page-faq .faq-step-body h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.4;
}

.page-faq .faq-step-body p {
  margin: 0;
  max-width: 46ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--slate);
}

.page-faq .faq-steps-figure {
  margin: 0;
  background: var(--ink);
  border: 3px solid var(--ink);
  box-shadow: 8px 8px 0 rgba(23, 195, 201, .38);
  overflow: hidden;
}

.page-faq .faq-steps-figure img,
.page-faq .faq-devices-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 设备绑定 ---------- */

.page-faq .faq-devices-grid {
  display: grid;
  gap: 28px;
}

.page-faq .faq-device-rules {
  display: grid;
  gap: 0;
}

.page-faq .faq-device-rule {
  padding: 16px 0 18px;
  border-bottom: 1px solid var(--line);
}

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

.page-faq .faq-device-num {
  display: inline-block;
  margin-bottom: 8px;
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--red-deep);
}

.page-faq .faq-device-rule h3 {
  margin: 0 0 7px;
  font-size: 16.5px;
  font-weight: 800;
  line-height: 1.4;
}

.page-faq .faq-device-rule p {
  margin: 0;
  max-width: 52ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--slate);
}

.page-faq .faq-devices-figure {
  margin: 0;
  background: var(--white);
  border: 3px solid var(--ink);
  box-shadow: 8px 8px 0 rgba(226, 69, 47, .30);
  overflow: hidden;
}

/* ---------- 问答折叠 ---------- */

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

.page-faq .faq-item {
  border-bottom: 1px solid var(--line);
  transition: background var(--dur) var(--ease);
}

.page-faq .faq-item[open] {
  background: var(--white);
}

.page-faq .faq-item > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 17px 12px 17px 6px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
  transition: color var(--dur) var(--ease);
}

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

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

.page-faq .faq-item > summary:hover,
.page-faq .faq-item > summary:focus-visible {
  color: var(--cyan-deep);
}

.page-faq .faq-item-mark {
  flex: none;
  width: 0;
  height: 0;
  border-left: 7px solid transparent;
  border-right: 7px solid transparent;
  border-top: 9px solid var(--cyan-deep);
  transition: transform var(--dur) var(--ease), border-top-color var(--dur) var(--ease);
}

.page-faq .faq-item[open] .faq-item-mark {
  transform: rotate(180deg);
  border-top-color: var(--red);
}

.page-faq .faq-item-a {
  padding: 0 14px 20px 6px;
}

.page-faq .faq-item-a p {
  margin: 0;
  max-width: 66ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--slate);
}

/* ---------- 人工通道 ---------- */

.page-faq .faq-channels {
  display: grid;
  gap: 14px;
}

.page-faq .faq-channel {
  padding: 20px 18px;
  background: var(--white);
  border: 2px solid var(--ink);
  border-top: 4px solid var(--cyan);
  box-shadow: 5px 5px 0 var(--faq-ink-line);
}

.page-faq .faq-channel-num {
  margin: 0 0 10px;
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--cyan-deep);
}

.page-faq .faq-channel h3 {
  margin: 0 0 8px;
  font-size: 16.5px;
  font-weight: 800;
}

.page-faq .faq-channel p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate);
}

.page-faq .faq-channel a {
  color: var(--red-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
  word-break: break-all;
}

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

.page-faq .faq-support-tip {
  margin: 24px 0 0;
  padding: 16px 18px;
  background: var(--ink);
  color: rgba(255, 255, 255, .82);
  border-left: 3px solid var(--lemon);
  font-size: 14.5px;
  line-height: 1.8;
}

.page-faq .faq-support-tip a {
  color: var(--lemon);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 动效 ---------- */

@keyframes faq-drift {
  0% {
    background-position: 8% 18%, 92% 80%;
  }
  100% {
    background-position: 22% 32%, 78% 66%;
  }
}

/* ---------- 中等宽度 ---------- */

@media (min-width: 900px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1fr) 250px;
    gap: 42px;
    padding: 48px 40px 42px;
    align-items: start;
  }

  .page-faq .faq-steps-wrap {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 34px;
    align-items: start;
  }

  .page-faq .faq-devices-grid {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 36px;
    align-items: start;
  }

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

/* ---------- 桌面：常驻索引 ---------- */

@media (min-width: 1080px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    gap: 50px;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 28px;
  }

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

  .page-faq .faq-step {
    grid-template-columns: 112px minmax(0, 1fr);
    gap: 12px 22px;
  }

  .page-faq .faq-step::after {
    left: 112px;
  }
}

/* ---------- 窄屏 ---------- */

@media (max-width: 559px) {
  .page-faq .faq-hero {
    padding: 30px 18px 26px;
  }

  .page-faq .faq-hero-facts {
    gap: 10px 20px;
  }

  .page-faq .faq-step {
    grid-template-columns: 1fr;
    gap: 4px;
    padding: 16px 0 18px;
  }

  .page-faq .faq-step-num {
    grid-row: auto;
    font-size: 42px;
  }

  .page-faq .faq-step::after {
    left: 0;
    right: 22%;
  }

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

  .page-faq .faq-item > summary {
    font-size: 15px;
    gap: 12px;
  }
}

/* ---------- 无障碍 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-hero::before {
    animation: none;
  }

  .page-faq .faq-cta,
  .page-faq .faq-index-list a,
  .page-faq .faq-item,
  .page-faq .faq-item-mark {
    transition: none;
  }

  .page-faq .faq-cta:hover,
  .page-faq .faq-cta:focus-visible {
    transform: none;
  }
}