.page-faq {
  display: block;
  padding-bottom: 72px;
  color: var(--slate-200);
}

.page-faq .faq-shell {
  width: 100%;
  max-width: var(--shell-w);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- 面包屑 ---------- */

.page-faq .faq-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: 26px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--cyan-600);
}

.page-faq .faq-crumbs a {
  color: var(--slate-200);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.page-faq .faq-crumbs a:hover {
  color: var(--cyan-400);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  padding: 26px 0 0;
  max-width: 880px;
}

.page-faq .faq-kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--amber-500);
}

.page-faq .faq-kicker::before {
  content: "";
  width: 26px;
  height: 2px;
  border-radius: 2px;
  background: var(--amber-500);
}

.page-faq .faq-hero h1 {
  margin: 0;
  max-width: 22ch;
  color: var(--paper-050);
}

.page-faq .faq-lead {
  margin: 20px 0 0;
  max-width: 60ch;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--slate-200);
}

/* ---------- 栅格 ---------- */

.page-faq .faq-layout {
  display: grid;
  gap: 26px;
  margin-top: 40px;
}

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

/* ---------- 目录 ---------- */

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

.page-faq .faq-toc-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan-600);
}

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

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

.page-faq .toc-list a {
  display: block;
  white-space: nowrap;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(20, 52, 44, 0.6);
  color: var(--slate-200);
  font-size: 13.5px;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-faq .toc-list a:hover {
  color: var(--cyan-400);
  border-color: var(--cyan-400);
}

.page-faq .toc-list a.is-active {
  color: var(--cyan-400);
  border-color: var(--cyan-400);
  background: rgba(53, 224, 200, 0.12);
}

/* ---------- 章节骨架 ---------- */

.page-faq .faq-section {
  margin-bottom: 52px;
  scroll-margin-top: 104px;
  min-width: 0;
}

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

.page-faq .faq-section-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-section-num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--amber-500);
}

.page-faq .faq-section h2 {
  margin: 0;
  font-size: clamp(21px, 3.2vw, 28px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.32;
  color: var(--paper-050);
}

.page-faq .faq-p {
  margin: 0 0 16px;
  max-width: 66ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--slate-200);
}

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

.page-faq .faq-p a {
  color: var(--cyan-400);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-p--note {
  margin-top: 18px;
  font-size: 14px;
  color: var(--cyan-600);
}

.page-faq .faq-sub {
  margin: 30px 0 14px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper-050);
}

/* ---------- 步骤条 ---------- */

.page-faq .faq-steps {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-step {
  position: relative;
  padding: 0 0 26px 52px;
}

.page-faq .faq-step:last-child {
  padding-bottom: 0;
}

.page-faq .faq-step::before {
  content: "";
  position: absolute;
  left: 17px;
  top: 42px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, rgba(53, 224, 200, 0.45), rgba(53, 224, 200, 0.04));
}

.page-faq .faq-step:last-child::before {
  display: none;
}

.page-faq .step-num {
  position: absolute;
  left: 0;
  top: 0;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--cyan-400);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  box-shadow: 0 0 0 6px rgba(53, 224, 200, 0.08);
}

.page-faq .step-title {
  margin: 3px 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper-050);
}

.page-faq .step-meta {
  display: inline-block;
  margin-left: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  color: var(--amber-500);
  vertical-align: 2px;
}

.page-faq .step-body {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--slate-200);
}

.page-faq .step-body a {
  color: var(--cyan-400);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 图片 ---------- */

.page-faq .faq-figure {
  margin: 26px 0 0;
}

.page-faq .faq-figure--narrow {
  max-width: 480px;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--r-md);
  border: 1px solid var(--line-soft);
  background: var(--ink-700);
  object-fit: cover;
}

.page-faq .faq-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--cyan-600);
}

/* ---------- 版本刻度带 ---------- */

.page-faq .version-scale {
  margin: 22px 0 0;
  padding: 20px 18px;
  border-radius: var(--r-md);
  background: var(--ink-700);
  border: 1px solid var(--line);
}

.page-faq .scale-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
}

.page-faq .scale-label {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--cyan-600);
}

.page-faq .scale-current {
  font-size: 18px;
  font-weight: 700;
  color: var(--amber-300);
}

.page-faq .scale-ticks {
  display: flex;
  gap: 6px;
  margin-top: 16px;
}

.page-faq .tick {
  flex: 1 1 0;
  min-width: 0;
  padding: 7px 2px;
  border-radius: 8px;
  border: 1px solid transparent;
  background: rgba(53, 224, 200, 0.07);
  color: var(--cyan-600);
  font-family: var(--font-mono);
  font-size: 12px;
  text-align: center;
}

.page-faq .tick.is-current {
  background: rgba(255, 154, 60, 0.13);
  border-color: var(--amber-500);
  color: var(--amber-300);
  font-weight: 700;
}

.page-faq .scale-note {
  margin: 16px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--slate-200);
}

/* ---------- 要点列表 ---------- */

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

.page-faq .faq-list li {
  position: relative;
  max-width: 66ch;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--slate-200);
}

.page-faq .faq-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 11px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan-400);
}

.page-faq .faq-list strong {
  color: var(--paper-050);
  font-weight: 700;
}

/* ---------- 暖纸章节 ---------- */

.page-faq .paper-band {
  border-radius: var(--r-lg);
  padding: 26px 20px 22px;
  background: var(--paper-050);
  color: var(--ink-800);
}

.page-faq .paper-band h2 {
  color: var(--ink-800);
}

.page-faq .paper-band .faq-section-head {
  border-bottom-color: rgba(27, 36, 31, 0.14);
}

.page-faq .glossary {
  margin: 4px 0 0;
}

.page-faq .glossary-row {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-faq .glossary-row:first-child {
  border-top: 1px solid var(--line);
}

.page-faq .glossary-term {
  font-family: var(--font-mono);
  font-size: 13.5px;
  font-weight: 700;
  color: var(--cyan-400);
}

.page-faq .glossary-def {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--slate-200);
}

.page-faq .paper-band .glossary-row,
.page-faq .paper-band .glossary-row:first-child {
  border-color: rgba(27, 36, 31, 0.14);
}

.page-faq .paper-band .glossary-term {
  color: var(--ink-900);
}

.page-faq .paper-band .glossary-def {
  color: var(--ink-800);
}

/* ---------- 筛选 ---------- */

.page-faq .faq-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 18px;
}

.page-faq .faq-chip {
  appearance: none;
  -webkit-appearance: none;
  font: inherit;
  font-size: 13.5px;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--slate-200);
  cursor: pointer;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-faq .faq-chip:hover {
  color: var(--cyan-400);
  border-color: var(--cyan-600);
}

.page-faq .faq-chip[aria-pressed="true"],
.page-faq .faq-chip.is-active {
  background: rgba(53, 224, 200, 0.14);
  border-color: var(--cyan-400);
  color: var(--cyan-400);
}

/* ---------- 问答折叠 ---------- */

.page-faq .faq-item {
  margin-bottom: 12px;
  border-radius: var(--r-md);
  background: var(--ink-700);
  border: 1px solid rgba(201, 211, 207, 0.09);
  transition: border-color 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-faq .faq-item:hover {
  transform: translateY(-2px);
}

.page-faq .faq-item[open] {
  border-color: var(--line);
}

.page-faq .faq-q {
  position: relative;
  cursor: pointer;
  list-style: none;
  padding: 17px 52px 17px 20px;
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--slate-200);
  transition: color 0.2s var(--ease);
}

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

.page-faq .faq-q::marker {
  content: "";
}

.page-faq .faq-item[open] > .faq-q {
  color: var(--paper-050);
}

.page-faq .faq-q::after {
  content: "";
  position: absolute;
  right: 22px;
  top: 50%;
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--cyan-400);
  border-bottom: 2px solid var(--cyan-400);
  transform: translateY(-70%) rotate(45deg);
  transition: transform 0.22s var(--ease);
}

.page-faq .faq-item[open] .faq-q::after {
  transform: translateY(-30%) rotate(-135deg);
}

.page-faq .faq-item[open] .faq-q::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  bottom: 12px;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: var(--cyan-400);
}

.page-faq .faq-a {
  margin: 0;
  padding: 0 20px 20px;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate-200);
}

/* ---------- 联系方式 ---------- */

.page-faq .contact-grid {
  display: grid;
  gap: 12px;
}

.page-faq .faq-contact {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  min-width: 0;
  padding: 18px;
  border-radius: var(--r-md);
  background: var(--ink-700);
  border: 1px solid var(--line);
}

.page-faq .faq-contact .contact-key {
  flex: 1 0 100%;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--cyan-600);
}

.page-faq .faq-contact .contact-value {
  min-width: 0;
  font-family: var(--font-mono);
  font-size: 14.5px;
  font-weight: 700;
  color: var(--paper-050);
  word-break: break-all;
}

.page-faq .copy-chip {
  font: inherit;
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(53, 224, 200, 0.08);
  color: var(--cyan-400);
  cursor: pointer;
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-faq .copy-chip:hover {
  border-color: var(--cyan-400);
  background: rgba(53, 224, 200, 0.16);
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-faq .faq-shell {
    padding: 0 32px;
  }

  .page-faq .paper-band {
    padding: 32px 30px 28px;
  }

  .page-faq .glossary-row {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 22px;
    align-items: baseline;
    padding: 18px 0;
  }

  .page-faq .contact-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (min-width: 960px) {
  .page-faq {
    padding-bottom: 96px;
  }

  .page-faq .faq-layout {
    grid-template-columns: 188px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
    margin-top: 52px;
  }

  .page-faq .faq-toc {
    position: sticky;
    top: 108px;
  }

  .page-faq .toc-list {
    display: grid;
    gap: 2px;
    overflow: visible;
    padding: 0;
    border-left: 1px solid var(--line);
  }

  .page-faq .toc-list a {
    white-space: normal;
    padding: 9px 0 9px 16px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    margin-left: -1px;
    background: transparent;
    font-size: 14px;
  }

  .page-faq .toc-list a:hover,
  .page-faq .toc-list a.is-active {
    border-left-color: var(--cyan-400);
    background: transparent;
    color: var(--cyan-400);
  }

  .page-faq .faq-section {
    margin-bottom: 68px;
  }

  .page-faq .faq-step {
    padding-left: 62px;
  }
}

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

  .page-faq .faq-item:hover {
    transform: none;
  }
}