.page-faq {
  --faq-line: rgba(154, 167, 176, 0.22);
  --faq-line-soft: rgba(154, 167, 176, 0.12);
  background: var(--ink);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(34px, 6vw, 76px) 0 clamp(30px, 5vw, 58px);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-faq .faq-hero::after {
  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: 64px 64px;
  -webkit-mask-image: linear-gradient(180deg, #000, transparent 88%);
  mask-image: linear-gradient(180deg, #000, transparent 88%);
  pointer-events: none;
}

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

.page-faq .breadcrumb {
  margin-bottom: clamp(26px, 4vw, 48px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-faq .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}

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

.page-faq .faq-hero__title {
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 15em;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(38px, 7.4vw, 96px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--paper);
}

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

.page-faq .faq-hero__lede {
  margin: 0;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--mist);
}

.page-faq .faq-hero__stamp {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin: clamp(26px, 4vw, 42px) 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-faq .faq-hero__stamp-sep {
  color: var(--clay);
}

/* ---------- 状态面板 ---------- */
.page-faq .faq-main {
  padding: clamp(34px, 5vw, 68px) 0 clamp(56px, 8vw, 110px);
}

.page-faq .faq-status {
  display: grid;
  gap: 1px;
  background: var(--faq-line);
  border: 1px solid var(--line);
  margin: 0 0 clamp(34px, 5vw, 64px);
}

.page-faq .faq-status .stat {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "dot title"
    "text text";
  align-items: center;
  gap: 8px 12px;
  background: var(--ink-deep);
  padding: 20px 18px;
}

.page-faq .dot {
  grid-area: dot;
  width: 8px;
  height: 8px;
  flex: none;
}

.page-faq .stat__title {
  grid-area: title;
  margin: 0;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-faq .stat__text {
  grid-area: text;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  align-items: start;
}

/* 左侧分类索引 */
.page-faq .faq-index {
  border-top: 1px solid var(--line-strong);
  padding-top: 16px;
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
}

.page-faq .faq-index__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-height: 44px;
  box-sizing: border-box;
  padding: 11px 12px;
  border-left: 2px solid transparent;
  font-size: 15px;
  line-height: 1.4;
  color: var(--mist);
  text-decoration: none;
  transition: color 160ms ease, border-color 160ms ease, background 160ms ease;
}

.page-faq .faq-index__list a:hover,
.page-faq .faq-index__list a:focus-visible {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(53, 208, 214, 0.06);
}

.page-faq .faq-index__n {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--sand);
}

/* ---------- 筛选 ---------- */
.page-faq .filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 20px;
  margin-bottom: 4px;
  border-bottom: 1px solid var(--line);
}

.page-faq .filter__btn {
  min-height: 44px;
  padding: 0 15px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 0;
  cursor: pointer;
  transition: color 160ms ease, border-color 160ms ease, background 160ms ease;
}

.page-faq .filter__btn:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}

.page-faq .filter__btn[aria-pressed="true"] {
  color: var(--ink);
  background: var(--orange);
  border-color: var(--orange);
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa-list {
  margin-top: clamp(18px, 3vw, 30px);
}

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

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

.page-faq .qa[hidden] {
  display: none;
}

.page-faq .qa__head {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 22px 40px 22px 18px;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-head);
  font-size: clamp(17px, 2.2vw, 23px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
  transition: color 180ms ease;
}

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

.page-faq .qa__head::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 14px;
  width: 2px;
  background: transparent;
  transition: background 180ms ease;
}

.page-faq .qa[open] > .qa__head::before {
  background: var(--orange);
}

.page-faq .qa__head:hover {
  color: var(--cyan);
}

.page-faq .qa[open] > .qa__head {
  color: var(--orange-hi);
}

.page-faq .qa__head::after {
  content: "+";
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 400;
  color: var(--mist);
}

.page-faq .qa[open] > .qa__head::after {
  content: "–";
  color: var(--orange);
}

.page-faq .qa__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--sand);
}

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

.page-faq .qa__body {
  max-width: 78ch;
  padding: 2px 0 30px 18px;
}

.page-faq .qa__verdict {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0 0 22px;
  padding: 12px 15px;
  border-left: 2px solid var(--cyan);
  background: rgba(53, 208, 214, 0.06);
  font-size: 15px;
  line-height: 1.8;
  color: var(--paper);
}

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

/* 步骤清单 */
.page-faq .steps {
  counter-reset: step;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--faq-line);
  border: 1px solid var(--line);
}

.page-faq .steps > li {
  position: relative;
  counter-increment: step;
  padding: 16px 18px 16px 62px;
  background: var(--ink-deep);
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .steps > li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 18px;
  top: 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-faq .steps__t {
  display: block;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--sand);
}

/* 检查项 */
.page-faq .checks {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-faq .checks > li {
  position: relative;
  padding-left: 26px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .checks > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 9px;
  height: 9px;
  border: 1px solid var(--sand);
}

/* 配图 */
.page-faq .qa__figure {
  margin: 24px 0 0;
  border: 1px solid var(--line);
  background: var(--ink-deep);
}

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

.page-faq .qa__figure figcaption {
  padding: 11px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .qa__foot {
  margin: 20px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .qa__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 208, 214, 0.42);
  transition: color 160ms ease, border-color 160ms ease;
}

.page-faq .qa__body a:hover {
  color: var(--orange-hi);
  border-bottom-color: var(--orange-hi);
}

/* ---------- 显现动效 ---------- */
.page-faq [data-reveal] {
  opacity: 1;
}

.page-faq [data-reveal][data-reveal-state="out"] {
  opacity: 0;
  transform: translateY(12px);
}

.page-faq [data-reveal][data-reveal-state="in"] {
  opacity: 1;
  transform: none;
  transition:
    opacity 420ms ease calc(var(--reveal-i, 0) * 60ms),
    transform 420ms ease calc(var(--reveal-i, 0) * 60ms);
}

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-faq .faq-status {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-faq .qa__body {
    padding-left: 34px;
  }

  .page-faq .qa__head {
    padding-left: 24px;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-body {
    grid-template-columns: minmax(190px, 244px) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--bar-h) + 26px);
  }

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

  .page-faq .qa__body {
    max-width: 74ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq [data-reveal][data-reveal-state="out"],
  .page-faq [data-reveal][data-reveal-state="in"] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-faq .qa__head,
  .page-faq .filter__btn,
  .page-faq .faq-index__list a {
    transition: none;
  }
}

.page-faq {
  --reveal-i: 0.3s;
}