.page-faq {
  width: min(100% - 36px, var(--shell-w));
  margin-inline: auto;
  padding: var(--step-2) 0 var(--step-3);
  overflow-x: clip;
}

.page-faq .crumbs {
  margin-bottom: var(--step-1);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--step-2);
  background: var(--ink);
  color: var(--paper);
  border: var(--rule) solid var(--ink);
  box-shadow: var(--shadow-hard);
  padding: var(--step-2) var(--step-1);
  margin-bottom: var(--step-3);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -80px;
  bottom: -90px;
  width: 240px;
  height: 240px;
  background: linear-gradient(135deg, var(--blue), var(--lime));
  transform: rotate(45deg);
  opacity: 0.16;
  pointer-events: none;
}

.page-faq .faq-hero-wave {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 42px;
  fill: none;
  stroke: var(--silver);
  stroke-width: 2;
  opacity: 0.45;
  pointer-events: none;
}

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

.page-faq .faq-kicker {
  margin: 0 0 14px;
  color: var(--silver);
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-faq .faq-title {
  margin: 0 0 18px;
  font-size: clamp(30px, 7vw, 54px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  font-weight: 800;
  background: linear-gradient(96deg, var(--blue) 0%, var(--lime) 92%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-faq .faq-lede {
  margin: 0 0 var(--step-1);
  max-width: 40ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--silver);
}

.page-faq .faq-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .faq-hero .btn-ghost {
  color: var(--paper);
  border-color: var(--silver);
}

.page-faq .faq-hero-figure {
  position: relative;
  z-index: 1;
  margin: 0;
  border: var(--rule) solid var(--silver);
  background: var(--slate);
  box-shadow: 10px 10px 0 rgba(46, 107, 255, 0.45);
  transform: rotate(-1.2deg);
}

.page-faq .faq-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-faq .faq-hero-figure figcaption {
  padding: 10px 14px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--silver);
  border-top: 2px solid var(--slate);
}

/* ---------- 主题目录 ---------- */
.page-faq .faq-toc {
  border-top: var(--rule) solid var(--ink);
  border-bottom: var(--rule) solid var(--ink);
  padding: var(--step-1) 0;
  margin-bottom: var(--step-3);
}

.page-faq .faq-toc-label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--ink-soft);
}

.page-faq .faq-toc-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-toc-list a {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 9px 15px;
  border: 2px solid var(--ink);
  background: var(--paper-white);
  color: var(--ink);
  font-size: 14px;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.page-faq .faq-toc-list a .mono {
  font-size: 12px;
  color: var(--deep-blue);
}

.page-faq .faq-toc-list a:hover,
.page-faq .faq-toc-list a:focus-visible {
  background: var(--ink);
  color: var(--paper);
  transform: translateY(-2px);
}

.page-faq .faq-toc-list a:hover .mono,
.page-faq .faq-toc-list a:focus-visible .mono {
  color: var(--lime);
}

.page-faq .faq-toc-list a[aria-current="page"] {
  background: var(--ink);
  color: var(--lime);
  border-color: var(--ink);
}

.page-faq .faq-toc-list a[aria-current="page"] .mono {
  color: var(--lime);
}

/* ---------- 主题分组 ---------- */
.page-faq .faq-group {
  margin-bottom: var(--step-3);
  scroll-margin-top: 96px;
}

.page-faq .faq-group-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  background: var(--ink);
  border-left: 6px solid var(--silver);
  padding: 15px 18px;
  margin-bottom: var(--step-1);
}

.page-faq .faq-group-num {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--lime);
}

.page-faq .faq-group-title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(19px, 4vw, 25px);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-faq .faq-group-note {
  margin: 0;
  flex: 1 1 220px;
  font-size: 14px;
  color: var(--silver);
}

/* ---------- 问答条目 ---------- */
.page-faq .faq-list {
  display: grid;
  gap: 12px;
}

.page-faq .faq-list-tail {
  margin-top: var(--step-1);
}

.page-faq .faq-item {
  position: relative;
  background: var(--paper-white);
  border: 2px solid rgba(20, 24, 33, 0.14);
  padding-left: 20px;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.page-faq .faq-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--silver);
  transition: width 0.28s ease, background 0.28s ease;
}

.page-faq .faq-item[open] {
  border-color: var(--ink);
  box-shadow: 6px 6px 0 rgba(20, 24, 33, 0.88);
}

.page-faq .faq-item[open]::before {
  width: 9px;
  background: linear-gradient(180deg, var(--blue), var(--lime));
}

.page-faq .faq-item > summary {
  position: relative;
  list-style: none;
  cursor: pointer;
  padding: 16px 50px 16px 14px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--ink);
}

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

.page-faq .faq-item > summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 14px;
  width: 24px;
  height: 24px;
  line-height: 20px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--ink);
  border: 2px solid var(--ink);
  transition: background 0.25s ease, color 0.25s ease;
}

.page-faq .faq-item[open] > summary::after {
  content: "\2212";
  background: var(--lime);
  color: var(--ink);
}

.page-faq .faq-item > summary:focus-visible {
  outline: 3px solid var(--deep-blue);
  outline-offset: 2px;
}

.page-faq .faq-answer {
  padding: 0 20px 18px 14px;
  color: var(--ink-soft);
  font-size: 15.5px;
  line-height: 1.85;
}

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

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

.page-faq .faq-answer a {
  color: var(--deep-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 自查编号清单 ---------- */
.page-faq .faq-check-sec {
  background: var(--ink);
  border: var(--rule) solid var(--ink);
  box-shadow: var(--shadow-hard);
  padding: var(--step-1);
  margin: var(--step-2) 0;
}

.page-faq .faq-check-title {
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--silver);
}

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

.page-faq .faq-check li {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 10px;
  align-items: baseline;
  padding: 13px 0;
  border-bottom: 1px solid rgba(198, 204, 214, 0.2);
  color: var(--paper);
  font-size: 15px;
  line-height: 1.75;
}

.page-faq .faq-check li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-faq .faq-check-num {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--lime);
}

/* ---------- 结构示意图 ---------- */
.page-faq .faq-diagram {
  margin: 0 0 var(--step-2);
  border: var(--rule) solid var(--ink);
  background: var(--paper-white);
  box-shadow: 8px 8px 0 rgba(198, 204, 214, 0.75);
}

.page-faq .faq-diagram img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-faq .faq-diagram figcaption {
  padding: 10px 14px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  border-top: 2px solid var(--silver);
}

/* ---------- 联系协助 ---------- */
.page-faq .faq-contact {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: var(--step-2);
}

.page-faq .faq-contact-card {
  border: 2px solid var(--ink);
  background: var(--paper-white);
  box-shadow: 6px 6px 0 rgba(20, 24, 33, 0.85);
  padding: 18px;
}

.page-faq .faq-contact-card-alert {
  border-left: 9px solid var(--alert);
}

.page-faq .faq-contact-label {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ink-soft);
}

.page-faq .faq-contact-value {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--ink);
  word-break: break-word;
}

.page-faq .faq-contact-hint {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-faq .faq-ask {
  border: 2px dashed var(--ink);
  background: linear-gradient(180deg, rgba(182, 255, 60, 0.16), rgba(245, 240, 230, 0));
  padding: var(--step-1);
  margin-bottom: var(--step-2);
}

.page-faq .faq-ask-title {
  margin-top: 0;
  margin-bottom: 14px;
}

.page-faq .faq-ask-list {
  margin: 0 0 14px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-faq .faq-ask-list li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

.page-faq .faq-ask-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 12px;
  height: 3px;
  background: var(--blue);
}

.page-faq .faq-ask-note {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---------- 桌面 ---------- */
@media (min-width: 760px) {
  .page-faq .faq-contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq {
    padding-top: var(--step-3);
  }

  .page-faq .faq-hero {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: center;
    gap: var(--step-3);
    padding: var(--step-3) var(--step-2);
  }

  .page-faq .faq-title {
    max-width: 14ch;
  }

  .page-faq .faq-check {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: var(--step-2);
  }

  .page-faq .faq-check li:nth-last-child(-n + 2) {
    border-bottom: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-toc-list a,
  .page-faq .faq-item,
  .page-faq .faq-item::before,
  .page-faq .faq-item > summary::after {
    transition: none;
  }

  .page-faq .faq-hero-figure {
    transform: none;
  }
}