.page-faq {
  --faq-rail: 244px;
  --faq-edge: rgba(61, 242, 208, 0.30);
  --faq-card: linear-gradient(180deg, rgba(18, 48, 42, 0.88), rgba(11, 15, 14, 0.94));
  --faq-cell: rgba(11, 15, 14, 0.86);
}

/* ---------- 面包屑 ---------- */
.page-faq .crumbs {
  padding: 18px 0 0;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(24px, 4vw, 52px) 0 clamp(30px, 5vw, 60px);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(61, 242, 208, 0.07), rgba(5, 26, 21, 0) 64%), var(--ink-900);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.55;
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-faq .display-title {
  margin: 14px 0 18px;
  font-size: clamp(2rem, 6.2vw, 4.1rem);
  line-height: 1.06;
  letter-spacing: -0.01em;
}

.page-faq .display-title em {
  font-style: normal;
  color: var(--mint);
}

.page-faq .lede {
  max-width: 58ch;
  color: var(--ink-text);
}

.page-faq .faq-hero__side {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-faq .faq-ticker {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 13px 15px;
  border: 1px solid var(--faq-edge);
  background: var(--mint-soft);
}

.page-faq .faq-ticker p {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--ink-text);
}

.page-faq .faq-quick {
  display: grid;
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-faq .faq-quick > div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 11px 14px;
  background: var(--faq-cell);
}

.page-faq .faq-quick dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-text-dim);
}

.page-faq .faq-quick dd {
  margin: 0;
  font-size: 13.5px;
  color: var(--paper);
}

/* ---------- 主体：左索引 + 右步骤 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  padding-top: clamp(28px, 4vw, 54px);
  padding-bottom: clamp(28px, 4vw, 54px);
}

.page-faq .faq-rail {
  border-bottom: 1px solid var(--line);
  padding-bottom: 16px;
}

.page-faq .faq-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mint);
  text-transform: uppercase;
}

.page-faq .faq-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-faq .faq-rail__list li {
  flex: 0 0 auto;
}

.page-faq .faq-rail__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  border: 1px solid var(--line-strong);
  font-size: 13px;
  color: var(--ink-text);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-faq .faq-rail__list a .mono {
  font-size: 11px;
  color: var(--mint);
}

.page-faq .faq-rail__list a:hover,
.page-faq .faq-rail__list a:focus-visible {
  border-color: var(--mint);
  background: var(--mint-soft);
  color: var(--paper);
}

.page-faq .faq-rail__note {
  margin: 14px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--ink-text-dim);
}

/* ---------- 步骤卡 ---------- */
.page-faq .faq-flow {
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
  min-width: 0;
}

.page-faq .faq-step {
  position: relative;
  padding: clamp(18px, 3vw, 32px);
  border: 1px solid var(--line);
  border-left: 2px solid var(--faq-edge);
  background: var(--faq-card);
  box-shadow: var(--shadow-brut);
  scroll-margin-top: calc(var(--header-h) + 24px);
  min-width: 0;
}

.page-faq .faq-step:target {
  border-left-color: var(--orange);
}

.page-faq .faq-step__head {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  margin-bottom: 16px;
}

.page-faq .faq-step__num {
  flex: 0 0 42px;
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--faq-edge);
  background: rgba(61, 242, 208, 0.08);
  color: var(--mint);
  font-size: 14px;
}

.page-faq .faq-step h2 {
  margin: 0 0 6px;
  font-size: clamp(1.12rem, 2.6vw, 1.55rem);
  font-weight: 600;
  line-height: 1.32;
  color: var(--paper);
}

.page-faq .faq-step__sub {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--ink-text-dim);
}

.page-faq .faq-actions {
  counter-reset: faq-act;
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-actions li {
  counter-increment: faq-act;
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 10px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink-text);
}

.page-faq .faq-actions li::before {
  content: counter(faq-act, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--mint);
  border-top: 1px solid var(--faq-edge);
  padding-top: 7px;
  letter-spacing: 0.05em;
}

.page-faq .faq-actions a,
.page-faq .faq-tip a {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid var(--faq-edge);
}

.page-faq .faq-actions a:hover,
.page-faq .faq-tip a:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.page-faq .faq-tip {
  margin: 16px 0 0;
  padding: 12px 14px;
  border-left: 2px solid var(--orange);
  background: rgba(255, 107, 44, 0.07);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--ink-text);
}

/* ---------- 四级层级 ---------- */
.page-faq .faq-levels {
  display: grid;
  gap: 1px;
  margin-top: 18px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-faq .faq-level {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
  padding: 12px 14px;
  background: var(--faq-cell);
  font-size: 13.5px;
  color: var(--ink-text);
}

.page-faq .faq-level .mono {
  font-size: 11px;
  color: var(--violet);
  letter-spacing: 0.08em;
}

.page-faq .faq-level b {
  font-weight: 600;
  color: var(--paper);
}

.page-faq .faq-level em {
  margin-left: auto;
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--silver);
}

/* ---------- 图 ---------- */
.page-faq .faq-figure {
  margin: 20px 0 0;
}

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

.page-faq .faq-figure figcaption {
  margin-top: 10px;
  padding-left: 10px;
  border-left: 2px solid var(--silver);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--ink-text-dim);
}

/* ---------- 指标标签 ---------- */
.page-faq .faq-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.page-faq .faq-metrics span {
  padding: 6px 12px;
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-text);
}

.page-faq .faq-metrics span:first-child,
.page-faq .faq-metrics span:nth-child(2) {
  border-color: var(--faq-edge);
  color: var(--mint);
  background: rgba(61, 242, 208, 0.07);
}

/* ---------- 终端对比 ---------- */
.page-faq .faq-devices {
  display: grid;
  gap: 14px;
  margin-top: 4px;
}

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

.page-faq .faq-device--tablet {
  border-color: var(--faq-edge);
  box-shadow: var(--shadow-brut);
}

.page-faq .faq-device__label {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--violet);
}

.page-faq .faq-device--tablet .faq-device__label {
  color: var(--mint);
}

.page-faq .faq-device ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-faq .faq-device li {
  position: relative;
  padding-left: 14px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-text);
}

.page-faq .faq-device li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 5px;
  height: 5px;
  background: var(--silver);
}

.page-faq .faq-device--tablet li::before {
  background: var(--mint);
}

/* ---------- FAQ 手风琴 ---------- */
.page-faq .faq-acc {
  margin-top: 6px;
  border-top: 1px solid var(--line);
}

.page-faq .faq-acc details {
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-acc summary {
  position: relative;
  padding: 16px 42px 16px 0;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--paper);
  transition: color 0.2s var(--ease);
}

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

.page-faq .faq-acc summary::after {
  content: "+";
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--mint);
}

.page-faq .faq-acc details[open] summary {
  color: var(--mint);
}

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

.page-faq .faq-acc summary:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 2px;
}

.page-faq .faq-acc p {
  margin: 0 0 18px;
  padding-right: 8px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-text);
}

/* ---------- 求助卡 ---------- */
.page-faq .faq-help {
  padding-bottom: clamp(36px, 6vw, 72px);
}

.page-faq .faq-help__card {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  padding: clamp(20px, 3.4vw, 36px);
  border: 1px solid var(--line-strong);
  background:
    linear-gradient(120deg, rgba(155, 140, 255, 0.10), rgba(5, 26, 21, 0) 55%),
    var(--ink-950);
  box-shadow: var(--shadow-brut-lg);
}

.page-faq .faq-help__text h2 {
  margin: 12px 0 10px;
  font-size: clamp(1.2rem, 3vw, 1.7rem);
  font-weight: 600;
  line-height: 1.3;
  color: var(--paper);
}

.page-faq .faq-help__text p {
  margin: 0;
  max-width: 52ch;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink-text);
}

.page-faq .faq-help__act {
  display: grid;
  gap: 12px;
  align-content: start;
  justify-items: start;
  min-width: 0;
}

.page-faq .faq-help__act .copy-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.page-faq .faq-help__act .contact-val {
  font-size: 13px;
  color: var(--paper);
  word-break: break-all;
}

.page-faq .faq-help__phone {
  margin: 0;
  font-size: 18px;
  letter-spacing: 0.04em;
  color: var(--mint);
}

.page-faq .faq-help__act .copy-status {
  font-size: 12px;
  color: var(--coral);
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 760px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1fr) minmax(260px, 320px);
    align-items: start;
  }

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

  .page-faq .faq-help__card {
    grid-template-columns: minmax(0, 1fr) minmax(280px, 360px);
    align-items: start;
  }
}

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

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    border-bottom: 0;
    border-left: 1px solid var(--line);
    padding: 4px 0 4px 16px;
  }

  .page-faq .faq-rail__list {
    display: grid;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-rail__list a {
    width: 100%;
    justify-content: flex-start;
    border: 0;
    border-left: 2px solid transparent;
    padding: 9px 10px;
    white-space: normal;
  }

  .page-faq .faq-rail__list a:hover,
  .page-faq .faq-rail__list a:focus-visible {
    border-left-color: var(--mint);
    background: var(--mint-soft);
  }

  .page-faq .faq-rail__list a .mono {
    flex: 0 0 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-rail__list a,
  .page-faq .faq-acc summary {
    transition: none;
  }

  .page-faq .pulse-dot {
    animation: none;
  }
}