.page-faq {
  --faq-gap: clamp(1rem, 3vw, 1.8rem);
  --faq-band: clamp(3rem, 12vw, 8rem);
  background: var(--ink-0);
  color: var(--fg);
  padding-bottom: clamp(3.5rem, 9vw, 7rem);
  overflow-x: clip;
}

.page-faq img {
  max-width: 100%;
  height: auto;
}

/* ---------- 面包屑 ---------- */
.page-faq .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  padding: clamp(1rem, 2.5vw, 1.6rem) 0 0;
  font-size: .8rem;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-faq .breadcrumbs .crumb {
  color: var(--muted);
  text-decoration: none;
  transition: color .25s var(--ease);
}

.page-faq .breadcrumbs .crumb:hover {
  color: var(--accent);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  display: grid;
  gap: clamp(1.6rem, 4vw, 3rem);
  padding: clamp(1.4rem, 3.6vw, 2.6rem) 0 clamp(2rem, 5vw, 3.2rem);
}

.page-faq .faq-hero-copy .eyebrow {
  display: inline-block;
  margin: 0 0 .9rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--accent);
}

.page-faq .faq-h1 {
  margin: 0 0 1rem;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.9rem, 5.4vw, 3.4rem);
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--fg);
  max-width: 16ch;
}

.page-faq .faq-hero-copy .lead {
  max-width: 58ch;
  margin: 0 0 1.6rem;
  font-size: clamp(1rem, 1.6vw, 1.08rem);
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .faq-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

.page-faq .faq-index {
  padding: clamp(1.05rem, 2.6vw, 1.5rem);
  border-radius: var(--radius);
  align-self: start;
}

.page-faq .faq-index-title {
  margin: 0 0 .9rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .18em;
  color: var(--muted);
}

.page-faq .faq-index-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: .1rem;
}

.page-faq .faq-index-link {
  display: grid;
  grid-template-columns: 2.2rem minmax(0, 1fr);
  gap: .6rem;
  align-items: baseline;
  padding: .55rem .5rem;
  border-radius: 4px;
  color: var(--fg);
  text-decoration: none;
  font-size: .92rem;
  line-height: 1.5;
  transition: background .25s var(--ease), color .25s var(--ease);
}

.page-faq .faq-index-link .idx {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .12em;
  color: var(--accent);
}

.page-faq .faq-index-link:hover {
  background: rgba(22, 57, 92, .55);
  color: var(--accent-2);
}

/* ---------- 章节骨架 ---------- */
.page-faq .chapter {
  position: relative;
  padding-top: clamp(2.4rem, 6vw, 4.2rem);
  scroll-margin-top: calc(var(--header-h) + 1rem);
}

.page-faq .chapter-band {
  display: block;
  width: var(--faq-band);
  height: 8px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), rgba(255, 106, 26, 0));
  margin-bottom: .9rem;
}

.page-faq .chapter-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .5rem 1rem;
  align-items: baseline;
  margin-bottom: clamp(1.3rem, 3.4vw, 2.2rem);
}

.page-faq .chapter-num {
  grid-column: 1;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .18em;
  color: var(--accent);
  padding-top: .3rem;
}

.page-faq .chapter-title {
  grid-column: 2;
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.45rem, 3.6vw, 2.3rem);
  line-height: 1.2;
  letter-spacing: -.015em;
  color: var(--fg);
}

.page-faq .chapter-desc {
  grid-column: 1 / -1;
  margin: .55rem 0 0;
  max-width: 62ch;
  font-size: .95rem;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 图片容器 ---------- */
.page-faq .faq-flow-figure {
  margin: 0 0 clamp(1.6rem, 4vw, 2.6rem);
  border-radius: var(--radius);
  overflow: hidden;
}

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

.page-faq .faq-compat-figure {
  margin: clamp(1.4rem, 3.6vw, 2.2rem) 0 0;
  border-radius: var(--radius);
  overflow: hidden;
}

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

/* ---------- 折叠面板 ---------- */
.page-faq .accordion {
  display: block;
  border-bottom: 1px solid var(--line);
}

.page-faq .accordion-item {
  border-top: 1px solid var(--line);
}

.page-faq .acc-trigger {
  display: grid;
  grid-template-columns: 3rem minmax(0, 1fr) auto;
  align-items: center;
  gap: .8rem;
  width: 100%;
  padding: clamp(.95rem, 2.4vw, 1.3rem) 0;
  background: none;
  border: 0;
  color: var(--fg);
  text-align: left;
  font: inherit;
  cursor: pointer;
  transition: color .25s var(--ease);
}

.page-faq .acc-trigger:hover {
  color: var(--accent-2);
}

.page-faq .step-num {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .18em;
  color: var(--accent);
}

.page-faq .step-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1rem, 2.2vw, 1.18rem);
  line-height: 1.4;
  transition: font-size .3s var(--ease);
}

.page-faq .acc-trigger[aria-expanded="true"] .step-title {
  font-size: clamp(1.06rem, 2.6vw, 1.32rem);
}

.page-faq .acc-icon {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1;
  color: var(--accent);
}

.page-faq .acc-icon::before {
  content: "+";
}

.page-faq .acc-trigger[aria-expanded="true"] .acc-icon::before {
  content: "−";
}

.page-faq .acc-panel {
  display: grid;
  grid-template-rows: 0fr;
  overflow: hidden;
  transition: grid-template-rows .38s var(--ease);
}

.page-faq .acc-panel > .acc-panel-inner {
  min-height: 0;
  overflow: hidden;
}

.page-faq .acc-trigger[aria-expanded="true"] + .acc-panel {
  grid-template-rows: 1fr;
}

.page-faq .faq-step-body {
  margin: 0 0 .9rem;
  max-width: 64ch;
  font-size: .95rem;
  line-height: 1.82;
  color: var(--muted);
}

.page-faq .faq-step-check {
  display: flex;
  align-items: flex-start;
  gap: .6rem;
  margin: 0 0 clamp(1rem, 2.4vw, 1.4rem);
  max-width: 64ch;
  font-size: .89rem;
  line-height: 1.72;
  color: var(--fg);
}

.page-faq .check-mark {
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  margin-top: .58rem;
  border-radius: 50%;
  background: var(--signal);
}

/* ---------- 序列列表 ---------- */
.page-faq .faq-sequence {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: clamp(.9rem, 2.4vw, 1.4rem);
}

.page-faq .faq-sequence--tight {
  gap: clamp(.6rem, 1.8vw, 1rem);
}

.page-faq .faq-seq-item {
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr);
  gap: .15rem 1rem;
  padding: .9rem 0;
  border-top: 1px solid var(--line);
}

.page-faq .faq-seq-num {
  grid-column: 1;
  grid-row: 1 / span 2;
  padding-top: .25rem;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .18em;
  color: var(--accent);
}

.page-faq .faq-seq-title {
  grid-column: 2;
  margin: 0 0 .35rem;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(.98rem, 2.2vw, 1.14rem);
  line-height: 1.42;
  color: var(--fg);
}

.page-faq .faq-seq-item p {
  grid-column: 2;
  margin: 0;
  max-width: 64ch;
  font-size: .94rem;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 注册情形卡片 ---------- */
.page-faq .faq-case-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
}

.page-faq .faq-case {
  display: flex;
  flex-direction: column;
  gap: .7rem;
  padding: clamp(1.05rem, 2.6vw, 1.5rem);
  border-radius: var(--radius);
}

.page-faq .faq-case-tag {
  align-self: flex-start;
  padding: .18rem .6rem;
  border: 1px solid rgba(255, 106, 26, .42);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .18em;
  color: var(--accent);
}

.page-faq .faq-case-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.02rem, 2.3vw, 1.18rem);
  line-height: 1.38;
  color: var(--fg);
}

.page-faq .faq-case p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 兼容对照表 ---------- */
.page-faq .faq-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-1);
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-table-caption {
  padding: .8rem 1rem 0;
  text-align: left;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--muted);
}

.page-faq .faq-table {
  width: 100%;
  min-width: 660px;
  border-collapse: collapse;
  font-size: .89rem;
}

.page-faq .faq-table thead th {
  background: var(--ink-2);
  padding: .85rem 1rem;
  text-align: left;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .14em;
  color: var(--fg);
}

.page-faq .faq-table tbody td {
  padding: .85rem 1rem;
  border-top: 1px solid var(--line);
  line-height: 1.6;
  color: var(--muted);
  vertical-align: top;
}

.page-faq .faq-table tbody tr:nth-child(odd) {
  background: rgba(22, 57, 92, .32);
}

.page-faq .faq-table tbody td:first-child {
  color: var(--fg);
  font-weight: 600;
}

.page-faq .faq-table .cell-status {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  white-space: nowrap;
  color: var(--fg);
}

.page-faq .faq-table .status-dot {
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--signal);
}

/* ---------- 下载容量与处理 ---------- */
.page-faq .faq-download-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
}

.page-faq .faq-limits {
  display: grid;
  align-content: start;
  gap: .9rem;
  padding: clamp(1.05rem, 2.6vw, 1.5rem);
  border-radius: var(--radius);
}

.page-faq .faq-limit {
  display: flex;
  align-items: baseline;
  gap: .6rem;
}

.page-faq .faq-limit .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3.2vw, 2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--accent);
}

.page-faq .faq-limit .stat-label {
  font-size: .86rem;
  line-height: 1.5;
  color: var(--muted);
}

.page-faq .faq-limits-note {
  margin: .4rem 0 0;
  padding-top: .9rem;
  border-top: 1px solid var(--line);
  font-size: .9rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 咨询准备 ---------- */
.page-faq .faq-prep {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
}

.page-faq .faq-prep-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: .6rem;
}

.page-faq .faq-prep-list li {
  position: relative;
  padding-left: 1.5rem;
  font-size: .97rem;
  line-height: 1.75;
  color: var(--fg);
}

.page-faq .faq-prep-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62rem;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--accent);
}

.page-faq .faq-safe-note {
  margin: 1.2rem 0 0;
  padding: .9rem 1.1rem;
  border-left: 3px solid var(--signal);
  background: rgba(184, 255, 74, .07);
  font-size: .91rem;
  line-height: 1.75;
  color: var(--fg);
}

.page-faq .faq-contact-card {
  display: grid;
  align-content: start;
  gap: .85rem;
  padding: clamp(1.05rem, 2.6vw, 1.5rem);
  border-radius: var(--radius);
}

.page-faq .faq-contact-line {
  margin: 0;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-faq .faq-contact-line a {
  color: var(--fg);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-faq .faq-contact-line a:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.page-faq .faq-copy-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .6rem;
  padding: .7rem .8rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-0);
}

.page-faq .faq-copy-row code {
  flex: 1 1 auto;
  min-width: 0;
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--fg);
  overflow-wrap: anywhere;
}

.page-faq .copy-btn {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .14em;
  padding: .35rem .72rem;
  background: none;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--fg);
  cursor: pointer;
  transition: border-color .25s var(--ease), color .25s var(--ease);
}

.page-faq .copy-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.page-faq .copy-btn.is-copied {
  border-color: var(--signal);
  color: var(--signal);
}

/* ---------- 章节刻度尺 ---------- */
.page-faq .in-page-ruler {
  position: fixed;
  right: clamp(.7rem, 2vw, 1.7rem);
  top: 50%;
  transform: translateY(-50%);
  display: none;
  flex-direction: column;
  gap: .85rem;
  z-index: 30;
}

.page-faq .ruler-item {
  display: flex;
  align-items: center;
  gap: .5rem;
  text-decoration: none;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  transition: color .25s var(--ease);
}

.page-faq .ruler-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  transition: width .3s var(--ease), background .3s var(--ease);
}

.page-faq .ruler-item:hover,
.page-faq .ruler-item.is-current {
  color: var(--accent);
}

.page-faq .ruler-item:hover .ruler-bar,
.page-faq .ruler-item.is-current .ruler-bar {
  width: 40px;
  background: var(--accent);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-faq .faq-case-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    column-gap: clamp(2rem, 5vw, 4rem);
    align-items: start;
  }

  .page-faq .chapter-head {
    grid-template-columns: 3.6rem minmax(0, 7fr) minmax(0, 4fr);
    gap: 0 1.6rem;
  }

  .page-faq .chapter-desc {
    grid-column: 3;
    margin: 0;
    padding-top: .35rem;
  }

  .page-faq .faq-download-grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    column-gap: clamp(1.6rem, 4vw, 3rem);
  }

  .page-faq .faq-prep {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    column-gap: clamp(1.6rem, 4vw, 3rem);
    align-items: start;
  }
}

@media (min-width: 1200px) {
  .page-faq .in-page-ruler {
    display: flex;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .acc-panel,
  .page-faq .step-title,
  .page-faq .ruler-bar,
  .page-faq .faq-index-link,
  .page-faq .copy-btn {
    transition: none;
  }
}