/* ===== 使用教程页 · page-faq ===== */
.page-faq {
  --faq-card: #101514;
  --faq-rhythm: clamp(26px, 4vw, 40px);
  position: relative;
  background-color: var(--ink);
  color: var(--mist);
  overflow-x: hidden;
}

/* ---- 首屏 ---- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(26px, 5vw, 58px) 0 clamp(30px, 5vw, 54px);
  background:
    radial-gradient(120% 90% at 92% -14%, rgba(43, 227, 200, .18), transparent 62%),
    var(--ink);
  isolation: isolate;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: min(60vw, 780px);
  height: 100%;
  background: linear-gradient(158deg, rgba(22, 88, 63, .92), rgba(14, 59, 46, .22));
  clip-path: polygon(0 0, 100% 0, 70% 100%, 0 100%);
  pointer-events: none;
  z-index: -1;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan) 34%, var(--amber) 76%, transparent);
  opacity: .55;
}

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

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
}

.page-faq .faq-hero .crumbs {
  margin-bottom: 18px;
  font-size: 13px;
}

.page-faq .faq-hero .eyebrow {
  margin: 0 0 10px;
}

.page-faq .faq-hero h1 {
  margin: 0 0 16px;
  max-width: 17ch;
}

.page-faq .faq-hero__lede {
  margin: 0;
  max-width: 48ch;
  color: rgba(233, 241, 236, .88);
}

.page-faq .faq-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin-top: 26px;
}

.page-faq .faq-hero__facts .fact {
  display: inline-flex;
  align-items: baseline;
  gap: 5px;
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--graphite);
}

.page-faq .faq-hero__facts .fact b {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 16px;
  letter-spacing: 0;
  color: var(--amber);
}

.page-faq .faq-hero__figure {
  margin: 0;
}

.page-faq .faq-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border-radius: var(--r-lg);
  border: 1px solid var(--line-strong);
  background: var(--emerald);
}

/* ---- 主体两栏 ---- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 32px);
  padding-top: clamp(34px, 6vw, 66px);
  padding-bottom: clamp(46px, 8vw, 92px);
}

/* ---- 左侧步骤导航 ---- */
.page-faq .faq-rail {
  min-width: 0;
}

.page-faq .faq-rail .toc {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0;
}

.page-faq .faq-rail .toc-title {
  width: 100%;
  margin: 0 0 2px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--graphite);
}

.page-faq .faq-rail .toc-link {
  display: inline-block;
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: rgba(233, 241, 236, .03);
  color: var(--mist);
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  transition: color var(--t-fast), border-color var(--t-fast), background var(--t-fast);
}

.page-faq .faq-rail .toc-link:hover {
  color: var(--cyan);
  border-color: rgba(43, 227, 200, .55);
}

.page-faq .faq-rail .toc-link.is-active {
  color: var(--cyan);
  border-color: var(--cyan);
  background: var(--tint-cyan);
}

/* ---- 步骤区 ---- */
.page-faq .faq-steps {
  min-width: 0;
}

.page-faq .step {
  padding: var(--faq-rhythm) 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 96px;
}

.page-faq .step:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-faq .step-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 16px;
  row-gap: 6px;
  margin-bottom: 20px;
}

.page-faq .step-num {
  grid-row: span 2;
  font-size: clamp(26px, 4.4vw, 40px);
  line-height: .86;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-faq .step-head h2 {
  margin: 0;
}

.page-faq .step-lede {
  grid-column: 2;
  margin: 0;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.72;
  color: var(--graphite);
}

/* ---- 步骤列表 ---- */
.page-faq .step-list {
  counter-reset: faqstep;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
  max-width: 74ch;
}

.page-faq .step-list li {
  position: relative;
  padding-left: 40px;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(233, 241, 236, .9);
}

.page-faq .step-list li::before {
  counter-increment: faqstep;
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--amber);
}

.page-faq .step-list strong {
  color: var(--mist);
  font-weight: 600;
}

.page-faq .step-list a {
  color: var(--cyan);
  text-decoration: underline;
  text-decoration-color: rgba(43, 227, 200, .42);
  text-underline-offset: 3px;
  transition: text-decoration-color var(--t-fast);
}

.page-faq .step-list a:hover {
  text-decoration-color: var(--cyan);
}

/* ---- 场景卡 ---- */
.page-faq .scene-grid {
  display: grid;
  gap: 14px;
}

.page-faq .scene {
  position: relative;
  padding: 20px 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(158deg, var(--emerald-mid), var(--faq-card) 82%);
  overflow: hidden;
}

.page-faq .scene::after {
  content: "";
  position: absolute;
  top: -46px;
  right: -46px;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(43, 227, 200, .22), transparent 70%);
  pointer-events: none;
}

.page-faq .scene-tag {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--amber);
}

.page-faq .mini-steps {
  counter-reset: mini;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(233, 241, 236, .86);
}

.page-faq .mini-steps li {
  position: relative;
  padding-left: 22px;
}

.page-faq .mini-steps li::before {
  counter-increment: mini;
  content: counter(mini);
  position: absolute;
  left: 0;
  top: 1px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
}

/* ---- 维度标签 ---- */
.page-faq .dim-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
}

.page-faq .dim {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  background: rgba(233, 241, 236, .04);
  font-size: 13.5px;
  color: var(--mist);
}

.page-faq .dim::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  flex: none;
}

/* ---- 时间轴 ---- */
.page-faq .timeline {
  position: relative;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  margin: 24px 0 8px;
}

.page-faq .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  right: 6px;
  top: 11px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
  opacity: .72;
}

.page-faq .tnode {
  position: relative;
  padding-top: 32px;
  min-width: 0;
}

.page-faq .tnode::before {
  content: "";
  position: absolute;
  top: 4px;
  left: 0;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
}

.page-faq .tnode:last-child::before {
  border-color: var(--amber);
  animation: faqPulse 1s ease-in-out infinite;
}

.page-faq .tnode b {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  color: var(--mist);
}

.page-faq .tnode span {
  display: block;
  margin-top: 4px;
  padding-right: 8px;
  font-size: 11.5px;
  line-height: 1.55;
  color: var(--graphite);
}

@keyframes faqPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(242, 178, 51, .38); }
  50% { box-shadow: 0 0 0 8px rgba(242, 178, 51, 0); }
}

/* ---- 章节配图 ---- */
.page-faq .faq-figure {
  margin: 26px 0 0;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: var(--emerald);
}

/* ---- 提示条 ---- */
.page-faq .note-strip {
  margin-top: 22px;
  padding: 16px 18px;
  border: 1px dashed rgba(43, 227, 200, .38);
  border-radius: var(--r-md);
  background: linear-gradient(140deg, rgba(43, 227, 200, .08), transparent 72%);
  max-width: 74ch;
}

.page-faq .note-strip p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(233, 241, 236, .88);
}

/* ---- 字段清单 ---- */
.page-faq .field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 18px;
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
}

.page-faq .field-grid li {
  position: relative;
  padding-left: 18px;
  font-size: 13.5px;
  line-height: 1.6;
  color: rgba(233, 241, 236, .82);
}

.page-faq .field-grid li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 9px;
  height: 1px;
  background: var(--cyan);
}

/* ---- 折叠面板 ---- */
.page-faq .fold {
  margin-top: 12px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--faq-card);
  overflow: hidden;
  max-width: 74ch;
}

.page-faq .fold > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 15px 20px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 600;
  color: var(--mist);
  transition: background var(--t-fast);
}

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

.page-faq .fold > summary::after {
  content: "＋";
  flex: none;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--cyan);
  transition: transform var(--t-fast);
}

.page-faq .fold[open] > summary {
  background: rgba(43, 227, 200, .07);
}

.page-faq .fold[open] > summary::after {
  content: "－";
}

.page-faq .fold-body {
  padding: 4px 20px 18px;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(233, 241, 236, .85);
}

.page-faq .fold-body p {
  margin: 0 0 10px;
}

.page-faq .fold-body p:last-child {
  margin-bottom: 0;
}

/* ---- 行动按钮组 ---- */
.page-faq .step-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---- 结尾导航 ---- */
.page-faq .faq-next {
  border-top: 1px solid var(--line);
  background: linear-gradient(152deg, var(--indigo) 0%, var(--ink) 64%);
  padding: clamp(40px, 7vw, 78px) 0 clamp(46px, 7vw, 86px);
}

.page-faq .faq-next .eyebrow {
  margin: 0 0 10px;
}

.page-faq .faq-next__title {
  margin: 0;
  max-width: 22ch;
}

.page-faq .faq-next__grid {
  display: grid;
  gap: 12px;
  margin-top: 26px;
}

.page-faq .next-card {
  display: block;
  padding: 20px 20px 22px;
  border: 1px solid rgba(233, 241, 236, .18);
  border-radius: var(--r-md);
  background: rgba(11, 13, 12, .48);
  color: var(--mist);
  text-decoration: none;
  transition: border-color var(--t-fast), transform var(--t-fast), background var(--t-fast);
}

.page-faq .next-card:hover {
  border-color: var(--cyan);
  background: rgba(11, 13, 12, .72);
  transform: translateY(-2px);
}

.page-faq .next-card b {
  display: block;
  margin-bottom: 8px;
  font-size: 16px;
  font-weight: 600;
}

.page-faq .next-card span {
  display: block;
  font-size: 13.5px;
  line-height: 1.68;
  color: var(--graphite);
}

/* ---- 窄屏适配 ---- */
@media (max-width: 999px) {
  .page-faq .faq-hero::before {
    width: 100%;
    clip-path: polygon(0 0, 100% 0, 100% 58%, 0 100%);
    background: linear-gradient(168deg, rgba(22, 88, 63, .9), rgba(14, 59, 46, .18));
  }

  .page-faq .faq-hero h1 {
    max-width: none;
  }
}

@media (max-width: 560px) {
  .page-faq .step-head {
    grid-template-columns: minmax(0, 1fr);
    row-gap: 8px;
  }

  .page-faq .step-num {
    grid-row: auto;
  }

  .page-faq .step-lede {
    grid-column: 1;
  }

  .page-faq .step-list li {
    padding-left: 34px;
    font-size: 15px;
  }

  .page-faq .tnode span {
    padding-right: 4px;
    font-size: 11px;
  }

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

@media (min-width: 620px) {
  .page-faq .field-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-faq .scene-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 1000px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 1fr);
    align-items: center;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-body {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 76px);
    align-items: start;
  }

  .page-faq .faq-rail .toc {
    position: sticky;
    top: 104px;
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
  }

  .page-faq .faq-rail .toc-title {
    padding-left: 16px;
    margin-bottom: 12px;
  }

  .page-faq .faq-rail .toc-link {
    display: block;
    padding: 9px 16px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: none;
    font-size: 14px;
    color: var(--graphite);
    transition: color var(--t-fast), border-color var(--t-fast), background var(--t-fast);
  }

  .page-faq .faq-rail .toc-link:hover {
    color: var(--mist);
    background: rgba(233, 241, 236, .04);
  }

  .page-faq .faq-rail .toc-link.is-active {
    color: var(--cyan);
    border-left-color: var(--cyan);
    background: linear-gradient(90deg, var(--tint-cyan), transparent);
  }
}

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

  .page-faq .next-card:hover {
    transform: none;
  }
}