/* ===== 使用指南 / 页面专属样式 ===== */
.page-faq {
  --faq-panel: #141A45;
  --faq-line: #2C3370;
  --faq-ink: #D9DDF2;
  --faq-mute: #A8B0D4;
  --faq-gap: clamp(20px, 3.4vw, 40px);
  color: var(--text-dark);
}

.page-faq img {
  display: block;
  max-width: 100%;
}

.page-faq .crumb-sep {
  margin: 0 8px;
  color: var(--index);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(26px, 4.5vw, 58px) 0 clamp(30px, 5vw, 66px);
  background:
    radial-gradient(900px 420px at 88% -12%, rgba(53, 230, 208, 0.13), transparent 62%),
    radial-gradient(700px 380px at 4% 112%, rgba(242, 180, 65, 0.10), transparent 60%);
  border-bottom: 2px solid var(--edge);
}

.page-faq .faq-hero-grid {
  display: grid;
  gap: clamp(22px, 4vw, 46px);
  margin-top: 22px;
}

.page-faq .faq-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 5.4vw, 54px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: #FFFFFF;
}

.page-faq .faq-lede {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--text-mute);
}

.page-faq .faq-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-faq .faq-hero-figure {
  margin: 0;
}

.page-faq .faq-hero-figure .media-frame {
  border: 2px solid var(--edge);
  box-shadow: 6px 6px 0 #05071A;
}

.page-faq .faq-hero-figure figcaption,
.page-faq .faq-figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--index);
  line-height: 1.6;
}

/* ---------- 主体布局 ---------- */
.page-faq .faq-board {
  padding: clamp(30px, 5vw, 70px) 0 clamp(44px, 6vw, 90px);
}

.page-faq .faq-layout {
  display: grid;
  gap: var(--faq-gap);
  min-width: 0;
}

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

/* ---------- 侧栏：章节刻度 ---------- */
.page-faq .faq-rail {
  display: grid;
  gap: 18px;
  min-width: 0;
}

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

.page-faq .faq-rail-list li {
  flex: 0 0 auto;
  min-width: 0;
}

.page-faq .faq-rail-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 12px;
  border-left: 2px solid var(--faq-line);
  color: var(--index);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.5;
  white-space: nowrap;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-faq .faq-rail-link .mono {
  font-size: 11px;
  color: var(--gold);
}

.page-faq .faq-rail-link:hover {
  color: var(--cyan);
  border-left-color: var(--cyan);
}

.page-faq .faq-rail-link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-faq .faq-rail-link[aria-current="true"] {
  color: #FFFFFF;
  border-left-color: var(--cyan);
  background: var(--faq-panel);
}

.page-faq .faq-rail-help {
  padding: 16px;
  border: 2px solid var(--edge);
  background: var(--faq-panel);
  font-size: 13px;
  line-height: 1.75;
  color: var(--faq-mute);
}

.page-faq .faq-rail-help-title {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-faq .faq-rail-help p {
  margin: 0 0 10px;
}

.page-faq .faq-rail-help-link {
  color: var(--cyan);
  font-weight: 700;
  text-decoration: none;
}

.page-faq .faq-rail-help-link:hover {
  text-decoration: underline;
}

/* ---------- 章节 ---------- */
.page-faq .faq-section {
  padding: clamp(26px, 4vw, 48px) 0;
  border-top: 2px solid var(--edge);
}

.page-faq .faq-content > .faq-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-faq .faq-head {
  display: grid;
  gap: 10px;
  margin-bottom: 16px;
}

.page-faq .faq-idx {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 30px;
  border: 2px solid var(--gold);
  color: var(--gold);
  font-size: 13px;
  letter-spacing: 0.08em;
}

.page-faq .faq-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 2.7vw, 29px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: #FFFFFF;
}

.page-faq .faq-intro {
  margin: 0 0 22px;
  max-width: 66ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text-mute);
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa {
  margin: 0 0 16px;
  border: 2px solid var(--faq-line);
  background: var(--faq-panel);
  box-shadow: 6px 6px 0 #05071A;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-faq .qa[open] {
  border-color: var(--cyan);
  box-shadow: 5px 5px 0 rgba(53, 230, 208, 0.28);
}

.page-faq .qa-q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  font-size: clamp(15px, 1.7vw, 16.5px);
  font-weight: 700;
  line-height: 1.6;
  color: var(--faq-ink);
}

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

.page-faq .qa-q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -4px;
}

.page-faq .qa-num {
  flex: 0 0 auto;
  padding-top: 3px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-faq .qa-text {
  flex: 1 1 auto;
  min-width: 0;
  overflow-wrap: anywhere;
}

.page-faq .qa-tag {
  display: inline-block;
  margin-left: 8px;
  padding: 1px 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.08em;
  vertical-align: middle;
  color: #0B1030;
  background: var(--coral);
}

.page-faq .qa-mark {
  position: relative;
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  margin-top: 5px;
}

.page-faq .qa-mark::before,
.page-faq .qa-mark::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.page-faq .qa-mark::before {
  top: 8px;
  left: 0;
  width: 18px;
  height: 2px;
}

.page-faq .qa-mark::after {
  top: 0;
  left: 8px;
  width: 2px;
  height: 18px;
}

.page-faq .qa[open] .qa-mark::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-faq .qa-a {
  padding: 16px 16px 20px;
  border-top: 2px solid var(--faq-line);
}

.page-faq .qa[open] .qa-a {
  animation: faqReveal 0.26s ease both;
}

@keyframes faqReveal {
  from { opacity: 0; transform: translateY(-5px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 编号步骤 ---------- */
.page-faq .steps {
  counter-reset: faqstep;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq .steps > li {
  counter-increment: faqstep;
  position: relative;
  padding-left: 44px;
  margin-bottom: 16px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--faq-mute);
}

.page-faq .steps > li:last-child {
  margin-bottom: 0;
}

.page-faq .steps > li::before {
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  top: 1px;
  left: 0;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: #0B1030;
  background: var(--gold);
  border: 2px solid #0B1030;
}

.page-faq .steps > li:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 32px;
  bottom: -16px;
  left: 13px;
  width: 2px;
  background: var(--faq-line);
}

.page-faq .steps strong {
  color: #FFFFFF;
}

.page-faq .steps a,
.page-faq .faq-note a,
.page-faq .faq-lead-in a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 提示与清单 ---------- */
.page-faq .faq-note {
  margin: 16px 0 0;
  padding: 12px 14px;
  border-left: 3px solid var(--gold);
  background: rgba(242, 180, 65, 0.08);
  font-size: 14px;
  line-height: 1.8;
  color: var(--faq-mute);
}

.page-faq .faq-lead-in {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--faq-mute);
}

.page-faq .faq-checklist {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-faq .faq-checklist li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--faq-mute);
}

.page-faq .faq-checklist li::before {
  content: "";
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  margin-top: 9px;
  background: var(--cyan);
}

/* ---------- 配图 ---------- */
.page-faq .faq-figure {
  margin: 22px 0 0;
}

.page-faq .faq-figure .media-frame {
  border: 2px solid var(--edge);
  background: var(--ink-800);
  overflow: hidden;
}

.page-faq .faq-figure--square {
  max-width: 460px;
}

/* ---------- 官方识别线索 ---------- */
.page-faq .faq-clues {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

.page-faq .faq-clue {
  padding: 16px;
  border: 2px solid var(--faq-line);
  background: var(--faq-panel);
  box-shadow: 6px 6px 0 #05071A;
}

.page-faq .faq-clue .mono {
  display: block;
  margin-bottom: 8px;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-faq .faq-clue h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  color: #FFFFFF;
}

.page-faq .faq-clue p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--faq-mute);
}

/* ---------- 平台情况条 ---------- */
.page-faq .faq-facts {
  display: grid;
  gap: 2px;
  margin-top: 22px;
  border: 2px solid var(--faq-line);
  background: var(--faq-line);
}

.page-faq .faq-fact {
  padding: 14px 16px;
  background: var(--faq-panel);
}

.page-faq .faq-fact-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 22px;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-faq .faq-fact-label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--index);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

@media (min-width: 960px) {
  .page-faq .faq-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
    margin-top: 30px;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: 252px minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 92px;
  }

  .page-faq .faq-rail-list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

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

  .page-faq .faq-rail-link {
    white-space: normal;
  }

  .page-faq .faq-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa[open] .qa-a {
    animation: none;
  }

  .page-faq .qa-mark::before,
  .page-faq .qa-mark::after {
    transition: none;
  }

  .page-faq .qa {
    transition: none;
  }
}