.page-faq {
  --faq-num-size: clamp(38px, 6vw, 62px);
  --faq-pad: clamp(20px, 3vw, 36px);
  background: var(--ink-900);
  color: var(--paper);
}

/* ---------- 面包屑 ---------- */
.page-faq .faq-crumbbar {
  padding: 20px 0 0;
}

.page-faq .breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mist);
}

.page-faq .breadcrumb a {
  color: var(--paper-56);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-faq .breadcrumb a:hover,
.page-faq .breadcrumb a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(34px, 6vw, 76px) 0 clamp(32px, 5vw, 62px);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 72px 72px;
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: -30%;
  right: -12%;
  width: min(46vw, 520px);
  aspect-ratio: 1 / 1;
  background: linear-gradient(140deg, rgba(34, 245, 208, .16), rgba(122, 92, 255, .08) 55%, transparent 78%);
  clip-path: polygon(28% 0, 100% 0, 100% 72%, 72% 100%, 0 100%, 0 28%);
  pointer-events: none;
}

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

.page-faq .faq-hero__title {
  margin: 20px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 6.4vw, 78px);
  line-height: 1.04;
  letter-spacing: -.035em;
  max-width: 15ch;
}

.page-faq .faq-hero__title em {
  font-style: normal;
  color: var(--cyan);
}

.page-faq .faq-hero__lede {
  margin: 24px 0 0;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--paper-72);
}

.page-faq .faq-hero__meta {
  list-style: none;
  margin: 34px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-faq .faq-hero__meta li {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-faq .faq-hero__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
  min-width: 8em;
}

.page-faq .faq-hero__v {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--cyan-soft);
}

/* ---------- 主体分栏 ---------- */
.page-faq .faq-body {
  padding-top: clamp(36px, 5vw, 64px);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

/* ---------- 左侧索引轨道 ---------- */
.page-faq .rail {
  min-width: 0;
  border-top: 1px solid var(--line-strong);
  padding-top: 14px;
}

.page-faq .rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--mist);
}

.page-faq .rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .rail__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-left: 2px solid var(--line);
  color: var(--paper-56);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.4;
  white-space: nowrap;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}

.page-faq .rail__link:hover,
.page-faq .rail__link:focus-visible {
  color: var(--cyan-soft);
  background: var(--ink-800);
  border-left-color: var(--cyan-soft);
}

.page-faq .rail__link[aria-current="true"] {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: var(--ink-800);
}

.page-faq .rail__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mist);
  transition: color var(--t-fast) var(--ease);
}

.page-faq .rail__link[aria-current="true"] .rail__num {
  color: var(--cyan);
}

/* ---------- 步骤卡 ---------- */
.page-faq .faq-step {
  position: relative;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: var(--faq-pad);
  scroll-margin-top: 108px;
  transition: border-color var(--t-base) var(--ease);
}

.page-faq .faq-step + .faq-step {
  margin-top: 20px;
}

.page-faq .faq-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--line-strong);
  transition: background var(--t-base) var(--ease);
}

.page-faq .faq-step:hover,
.page-faq .faq-step:focus-within {
  border-color: var(--line-strong);
}

.page-faq .faq-step:hover::before,
.page-faq .faq-step:focus-within::before {
  background: var(--cyan);
}

.page-faq .faq-step__head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding-bottom: 16px;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-step__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--faq-num-size);
  line-height: .8;
  letter-spacing: -.05em;
  color: var(--cyan);
}

.page-faq .faq-step__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2.4vw, 26px);
  line-height: 1.25;
  letter-spacing: -.02em;
}

.page-faq .faq-step__lede {
  margin: 0 0 20px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--paper-72);
  max-width: 64ch;
}

.page-faq .faq-step__para {
  margin: 22px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--paper-72);
  max-width: 66ch;
}

.page-faq .faq-step a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 245, 208, .4);
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.page-faq .faq-step a:hover,
.page-faq .faq-step a:focus-visible {
  color: var(--cyan-soft);
  border-bottom-color: var(--cyan-soft);
}

/* ---------- 步骤链 ---------- */
.page-faq .faq-chain {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq .faq-chain__item {
  position: relative;
  padding: 0 0 22px 46px;
}

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

.page-faq .faq-chain__item::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 28px;
  bottom: 0;
  width: 1px;
  background: var(--line);
}

.page-faq .faq-chain__item:last-child::before {
  display: none;
}

.page-faq .faq-chain__badge {
  position: absolute;
  left: 0;
  top: 0;
  width: 31px;
  height: 31px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--ink-900);
  background: var(--cyan);
  border-radius: 2px;
}

.page-faq .faq-chain__item p {
  margin: 0;
  font-size: 16px;
  line-height: 1.72;
  color: var(--paper-72);
}

.page-faq .faq-chain__item strong {
  color: var(--paper);
  font-weight: 700;
}

/* ---------- 小标题与普通清单 ---------- */
.page-faq .faq-sub {
  margin: 26px 0 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -.01em;
  color: var(--paper);
}

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

.page-faq .faq-plain li {
  position: relative;
  padding-left: 18px;
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--paper-72);
}

.page-faq .faq-plain li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 7px;
  height: 7px;
  background: var(--violet);
}

.page-faq .faq-plain strong {
  color: var(--paper);
  font-weight: 700;
}

/* ---------- 键位样式 ---------- */
.page-faq .faq-key {
  display: inline-block;
  min-width: 2.2em;
  padding: 1px 8px;
  margin: 0 2px;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  background: var(--ink-700);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  color: var(--cyan);
  text-align: center;
}

/* ---------- 图文分栏 ---------- */
.page-faq .faq-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

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

.page-faq .faq-figure {
  margin: 0;
  background: var(--ink-700);
  border: 1px solid var(--line);
  border-radius: 2px;
  overflow: hidden;
}

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

.page-faq .faq-figure figcaption {
  padding: 11px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 提示块 ---------- */
.page-faq .faq-tip {
  margin-top: 24px;
  padding: 16px 18px;
  border-left: 2px solid var(--cyan);
  background: rgba(11, 74, 69, .32);
}

.page-faq .faq-tip p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--paper-72);
}

/* ---------- 侧栏说明板 ---------- */
.page-faq .faq-sideboard {
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--ink-700);
  padding: 18px;
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-faq .faq-sideboard__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--mist);
}

.page-faq .faq-sideboard__row {
  display: grid;
  gap: 8px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.page-faq .faq-sideboard__row:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.page-faq .faq-sideboard__row .tag {
  justify-self: start;
}

.page-faq .faq-sideboard__row p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--paper-56);
}

/* ---------- 信息清单 ---------- */
.page-faq .faq-check {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-faq .faq-check li {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-check__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-faq .faq-check__v {
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--paper-72);
}

/* ---------- 抽屉 ---------- */
.page-faq .drawer {
  margin-top: 22px;
  border-top: 1px solid var(--line);
}

.page-faq .drawer__head {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 14px 0;
  background: transparent;
  border: 0;
  text-align: left;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--paper-56);
  transition: color var(--t-fast) var(--ease);
}

.page-faq .drawer__head::before {
  content: "+";
  flex: none;
  font-size: 15px;
  line-height: 1;
  color: var(--cyan);
  transition: transform var(--t-base) var(--ease);
}

.page-faq .drawer__head[aria-expanded="true"]::before {
  content: "\2212";
}

.page-faq .drawer__head:hover,
.page-faq .drawer__head:focus-visible {
  color: var(--cyan-soft);
}

.page-faq .drawer__body {
  padding-bottom: 18px;
}

.page-faq .drawer__body p {
  margin: 0;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--paper-72);
}

/* ---------- 返回索引 ---------- */
.page-faq .faq-backlink {
  margin: 28px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.page-faq .faq-backlink a {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--mist);
  text-decoration: none;
  transition: color var(--t-fast) var(--ease);
}

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

/* ---------- 窄屏 ---------- */
@media (max-width: 999px) {
  .page-faq .rail__list {
    grid-auto-flow: column;
    grid-auto-columns: max-content;
    overflow-x: auto;
    padding-bottom: 8px;
    scrollbar-width: thin;
  }

  .page-faq .rail__link {
    border-left: 0;
    border-bottom: 2px solid var(--line);
    padding: 8px 12px;
  }

  .page-faq .rail__link:hover,
  .page-faq .rail__link:focus-visible {
    border-left-color: transparent;
    border-bottom-color: var(--cyan-soft);
  }

  .page-faq .rail__link[aria-current="true"] {
    border-left-color: transparent;
    border-bottom-color: var(--cyan);
  }
}

/* ---------- 宽屏 ---------- */
@media (min-width: 700px) {
  .page-faq .faq-hero__meta {
    grid-template-columns: repeat(3, minmax(0, auto));
    gap: 40px;
  }

  .page-faq .faq-hero__meta li {
    flex-direction: column;
    gap: 6px;
  }

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

  .page-faq .faq-split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    gap: 32px;
    align-items: start;
  }

  .page-faq .faq-split--flip {
    grid-template-columns: minmax(0, .88fr) minmax(0, 1.12fr);
  }

  .page-faq .faq-check li {
    grid-template-columns: 12em minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: 236px minmax(0, 1fr);
    gap: clamp(40px, 5vw, 76px);
    align-items: start;
  }

  .page-faq .rail {
    position: sticky;
    top: 104px;
  }

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