.page-faq {
  --faq-cut: 12px;
  --faq-line: var(--mist-200);
  --faq-gap: clamp(12px, 1.8vw, 18px);
  --faq-sticky: 108px;
  display: block;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-mast {
  padding: clamp(26px, 4.5vw, 52px) 0 clamp(34px, 5.5vw, 68px);
  background: linear-gradient(180deg, var(--mist-050) 0%, var(--paper) 72%);
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-mast .crumbs {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-faq .faq-mast__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
}

.page-faq .faq-mast__lead h1 {
  margin: 14px 0 18px;
  font-size: clamp(28px, 5.2vw, 54px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  font-weight: 900;
  color: var(--ink-900);
}

.page-faq .faq-mast__lead .lede {
  max-width: 62ch;
  color: var(--ink-700);
}

.page-faq .faq-mast__meta {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: clamp(20px, 3vw, 28px);
  background: var(--ink-900);
  color: var(--paper);
  clip-path: polygon(
    var(--faq-cut) 0,
    100% 0,
    100% calc(100% - var(--faq-cut)),
    calc(100% - var(--faq-cut)) 100%,
    0 100%,
    0 var(--faq-cut)
  );
}

.page-faq .faq-mast__meta .mono {
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--mist-200);
  padding-left: 14px;
  position: relative;
}

.page-faq .faq-mast__meta .mono::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 2px;
  background: var(--amber-500);
}

/* ---------- 章节头 ---------- */
.page-faq .faq-section-head {
  display: flex;
  gap: clamp(14px, 2.2vw, 22px);
  align-items: flex-start;
}

.page-faq .faq-num {
  font-size: clamp(30px, 4.4vw, 48px);
  line-height: 0.92;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--amber-500);
  flex: none;
}

.page-faq .faq-section-head .eyebrow,
.page-faq .faq-group__head .sec-title {
  margin-top: 4px;
}

/* ---------- 快速开始 ---------- */
.page-faq .faq-quick .faq-start {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
  margin-top: clamp(22px, 3vw, 34px);
}

.page-faq .faq-start__card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--paper);
  border: 1px solid var(--faq-line);
  border-top: 4px solid var(--amber-500);
  color: inherit;
  text-decoration: none;
  clip-path: polygon(
    var(--faq-cut) 0,
    100% 0,
    100% calc(100% - var(--faq-cut)),
    calc(100% - var(--faq-cut)) 100%,
    0 100%,
    0 var(--faq-cut)
  );
  transition: transform 0.22s ease, box-shadow 0.22s ease, background-color 0.22s ease;
}

.page-faq .faq-start__card:hover,
.page-faq .faq-start__card:focus-visible {
  transform: translateY(-4px);
  background: var(--mist-050);
  box-shadow: var(--shadow-1);
}

.page-faq .faq-start__no {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist-500);
}

.page-faq .faq-start__card h3 {
  margin: 0;
  font-size: clamp(19px, 2.2vw, 22px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-faq .faq-start__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-700);
}

.page-faq .faq-start__go {
  margin-top: auto;
  padding-top: 8px;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink-500);
  border-bottom: 3px solid var(--amber-200);
  align-self: flex-start;
}

.page-faq .faq-figure {
  margin: clamp(24px, 3.4vw, 40px) 0 0;
  width: 100%;
}

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

/* ---------- 主体两栏 ---------- */
.page-faq .faq-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
  align-items: start;
}

.page-faq .faq-toc {
  padding: 16px 18px;
  background: var(--mist-050);
  border: 1px solid var(--faq-line);
}

.page-faq .faq-toc .toc__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mist-500);
}

.page-faq .faq-toc .toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .faq-toc .toc__link {
  display: block;
  padding: 8px 10px;
  font-size: 15px;
  line-height: 1.5;
  color: var(--ink-700);
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
}

.page-faq .faq-toc .toc__link:hover {
  color: var(--ink-900);
  background: var(--paper);
}

.page-faq .faq-toc .toc__link[data-active] {
  color: var(--ink-900);
  font-weight: 700;
  border-left-color: var(--amber-500);
  background: var(--amber-200);
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  scroll-margin-top: var(--faq-sticky);
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(44px, 5.5vw, 76px);
}

.page-faq .faq-group__head {
  display: flex;
  gap: clamp(12px, 1.8vw, 18px);
  align-items: baseline;
  padding-bottom: 12px;
  margin-bottom: clamp(16px, 2.2vw, 24px);
  border-bottom: 2px solid var(--ink-900);
}

.page-faq .faq-group__head .sec-title {
  margin: 0;
  font-size: clamp(21px, 2.8vw, 30px);
  line-height: 1.3;
  color: var(--ink-900);
}

.page-faq .faq-note {
  margin: 0 0 clamp(16px, 2.2vw, 22px);
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist-500);
}

/* ---------- 折叠条目 ---------- */
.page-faq .faq-item {
  background: var(--paper);
  border: 1px solid var(--faq-line);
  border-left: 3px solid var(--mist-200);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.page-faq .faq-item + .faq-item {
  margin-top: 10px;
}

.page-faq .faq-item[open] {
  border-left-color: var(--amber-500);
  background: #fff;
}

.page-faq .faq-item > summary {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: clamp(14px, 2vw, 18px) clamp(16px, 2.2vw, 22px);
  cursor: pointer;
  list-style: none;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--ink-900);
}

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

.page-faq .faq-item > summary::after {
  content: "+";
  margin-left: auto;
  flex: none;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--amber-500);
  transition: transform 0.22s ease;
}

.page-faq .faq-item[open] > summary::after {
  transform: rotate(45deg);
}

.page-faq .faq-item__a {
  padding: 0 clamp(16px, 2.2vw, 22px) clamp(18px, 2.4vw, 24px);
  border-top: 1px dashed var(--faq-line);
  margin-top: -1px;
}

.page-faq .faq-lead {
  margin: 16px 0 12px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.75;
  color: var(--ink-700);
  border-left: 3px solid var(--amber-500);
  padding-left: 12px;
}

.page-faq .faq-item__a > p:last-child,
.page-faq .faq-checklist > p:last-child {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist-500);
}

.page-faq .faq-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: faqstep;
  display: grid;
  gap: 9px;
}

.page-faq .faq-steps li {
  counter-increment: faqstep;
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 10px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-700);
}

.page-faq .faq-steps li::before {
  content: counter(faqstep);
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  margin-top: 5px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-900);
  background: var(--amber-200);
}

/* ---------- 术语表 ---------- */
.page-faq .faq-table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  background: var(--paper);
  border: 1px solid var(--faq-line);
}

.page-faq .faq-table {
  width: 100%;
  min-width: 540px;
  border-collapse: collapse;
}

.page-faq .faq-table caption {
  text-align: left;
}

.page-faq .faq-table thead th {
  padding: 12px 16px;
  text-align: left;
  background: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
}

.page-faq .faq-table td {
  padding: 13px 16px;
  text-align: left;
  vertical-align: top;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-700);
  border-bottom: 1px solid var(--mist-200);
}

.page-faq .faq-table td:first-child {
  width: 170px;
  font-weight: 700;
  color: var(--ink-900);
  white-space: nowrap;
}

.page-faq .faq-table tbody tr:hover {
  background: var(--mist-050);
}

.page-faq .faq-table tbody tr:last-child td {
  border-bottom: 0;
}

/* ---------- 收尾区 ---------- */
.page-faq .faq-group--final {
  padding-top: clamp(6px, 1vw, 12px);
}

.page-faq .faq-unresolved {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 32px);
}

.page-faq .faq-checklist {
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--mist-050);
  border: 1px solid var(--faq-line);
  border-top: 4px solid var(--ink-700);
}

.page-faq .faq-checklist .faq-lead {
  margin-top: 0;
}

.page-faq .faq-contact {
  padding: clamp(20px, 2.8vw, 30px);
  background: var(--ink-900);
  color: var(--paper);
  clip-path: polygon(
    var(--faq-cut) 0,
    100% 0,
    100% calc(100% - var(--faq-cut)),
    calc(100% - var(--faq-cut)) 100%,
    0 100%,
    0 var(--faq-cut)
  );
}

.page-faq .faq-contact .eyebrow {
  color: var(--amber-500);
}

.page-faq .faq-contact__mail,
.page-faq .faq-contact__tel {
  margin: 12px 0 0;
  font-size: clamp(17px, 2.2vw, 20px);
  color: var(--paper);
  word-break: break-all;
}

.page-faq .faq-contact__note {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist-200);
}

.page-faq .faq-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-faq .faq-contact__link {
  margin-top: 16px;
  padding-left: 0;
  color: var(--amber-200);
}

.page-faq .faq-related {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  padding-top: clamp(18px, 2.4vw, 26px);
  border-top: 1px solid var(--faq-line);
}

.page-faq .faq-related__label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist-500);
  margin-right: 4px;
}

.page-faq .faq-related .tag {
  text-decoration: none;
}

/* ---------- 断点 ---------- */
@media (min-width: 660px) {
  .page-faq .faq-start {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-mast__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-unresolved {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-shell {
    grid-template-columns: 236px minmax(0, 1fr);
  }

  .page-faq .faq-toc {
    position: sticky;
    top: var(--faq-sticky);
    padding: 0;
    background: transparent;
    border: 0;
  }
}

@media (min-width: 1240px) {
  .page-faq .faq-shell {
    grid-template-columns: 256px minmax(0, 1fr);
    gap: clamp(44px, 4.5vw, 68px);
  }
}

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

  .page-faq .faq-start__card:hover,
  .page-faq .faq-start__card:focus-visible {
    transform: none;
  }
}