.page-faq {
  --faq-line: 1px solid var(--grey-300);
  --faq-pad: clamp(32px, 6vw, 68px);
  display: block;
  padding: 0 var(--gutter) clamp(56px, 10vw, 120px);
  background: linear-gradient(180deg, var(--paper) 0%, var(--paper) 40%, var(--fog) 100%);
  color: var(--grey-900);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
}

.page-faq > * {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
}

.page-faq .kicker {
  margin: 0;
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

/* ---------- 页首 ---------- */
.page-faq .faq-masthead {
  padding-block: clamp(20px, 4vw, 44px) clamp(18px, 3vw, 30px);
}

.page-faq .faq-masthead h1 {
  margin: 12px 0 18px;
  max-width: 20ch;
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(34px, 8vw, 66px);
  line-height: 0.98;
  letter-spacing: -0.018em;
}

.page-faq .faq-lead {
  margin: 0;
  max-width: 58ch;
  color: var(--grey-900);
  font-size: clamp(16px, 1.5vw, 18px);
}

/* ---------- 步骤索引 ---------- */
.page-faq .faq-index {
  position: sticky;
  top: 0;
  z-index: 6;
  padding-block: 10px 8px;
  background: rgba(246, 247, 243, 0.95);
  backdrop-filter: blur(8px);
  border-top: var(--faq-line);
  border-bottom: var(--faq-line);
}

.page-faq .faq-index-title {
  margin: 0 0 8px;
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.page-faq .faq-index-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

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

.page-faq .faq-index-list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 14px;
  border: var(--faq-line);
  background: var(--paper);
  color: var(--ink);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: transform 0.18s var(--ease), border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-faq .faq-index-list a:hover {
  transform: translateY(-2px);
  border-color: var(--green);
  background: var(--mist);
}

.page-faq .faq-index-list a:focus-visible {
  outline: 3px solid var(--lime);
  outline-offset: 2px;
}

.page-faq .faq-index-list .num {
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

/* ---------- 通用章节 ---------- */
.page-faq .faq-section {
  padding-block: var(--faq-pad);
  border-bottom: var(--faq-line);
}

.page-faq .faq-section-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px 14px;
  align-items: start;
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-faq .faq-step-no {
  padding: 7px 8px 6px;
  background: var(--green);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.06em;
}

.page-faq .faq-section h2 {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(22px, 3.6vw, 33px);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-faq .faq-body {
  display: grid;
  gap: clamp(18px, 3vw, 32px);
}

.page-faq .faq-body p {
  margin: 0 0 16px;
  max-width: 62ch;
}

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

/* ---------- 步骤列表 ---------- */
.page-faq .faq-steps {
  display: grid;
  gap: 8px;
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
}

.page-faq .faq-steps li {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  padding: 12px 12px 12px 10px;
  background: var(--paper);
  border: var(--faq-line);
  border-left: 3px solid var(--cyan);
  box-shadow: 3px 3px 0 rgba(12, 59, 46, 0.08);
}

.page-faq .faq-steps li p {
  margin: 0;
  max-width: none;
  font-size: 15px;
  line-height: 1.7;
}

.page-faq .faq-steps .num {
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  line-height: 1.8;
  letter-spacing: 0.04em;
}

/* ---------- 旁注 ---------- */
.page-faq .note {
  margin: 0;
  max-width: 58ch;
  padding: 12px 14px 12px 16px;
  border-left: 3px solid var(--green);
  background: linear-gradient(90deg, rgba(39, 230, 200, 0.14), rgba(39, 230, 200, 0));
  color: var(--grey-900);
  font-size: 14px;
  line-height: 1.75;
}

/* ---------- 插图 ---------- */
.page-faq .faq-figure {
  margin: 0;
  padding: 8px;
  background: var(--paper);
  border: var(--faq-line);
  box-shadow: 6px 6px 0 rgba(12, 59, 46, 0.14);
}

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

.page-faq .faq-figure figcaption {
  padding-top: 8px;
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
}

/* ---------- 视角切换 ---------- */
.page-faq .faq-switch {
  position: relative;
  padding: 14px;
  background: var(--paper);
  border: var(--faq-line);
  box-shadow: 5px 5px 0 rgba(12, 59, 46, 0.1);
}

.page-faq .faq-switch-input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-faq .faq-switch-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

.page-faq .faq-switch-tab {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border: var(--faq-line);
  background: var(--paper);
  color: var(--grey-900);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-faq #faq-view-mobile:checked ~ .faq-switch-tabs [for="faq-view-mobile"],
.page-faq #faq-view-desktop:checked ~ .faq-switch-tabs [for="faq-view-desktop"] {
  background: var(--green);
  border-color: var(--green);
  color: var(--mist);
}

.page-faq #faq-view-mobile:focus-visible ~ .faq-switch-tabs [for="faq-view-mobile"],
.page-faq #faq-view-desktop:focus-visible ~ .faq-switch-tabs [for="faq-view-desktop"] {
  outline: 3px solid var(--lime);
  outline-offset: 2px;
}

.page-faq .faq-switch-panel {
  display: none;
  gap: 14px;
}

.page-faq #faq-view-mobile:checked ~ .faq-switch-panel--mobile,
.page-faq #faq-view-desktop:checked ~ .faq-switch-panel--desktop {
  display: grid;
}

.page-faq .faq-diagram-wrap {
  padding: 8px;
  background: var(--fog);
  border: var(--faq-line);
}

.page-faq .faq-diagram {
  display: block;
  width: 100%;
  max-width: 320px;
  height: auto;
  margin-inline: auto;
  color: var(--grey-900);
}

/* ---------- 提醒卡 ---------- */
.page-faq .faq-alert-cards {
  display: grid;
  gap: 12px;
}

.page-faq .faq-alert-card {
  padding: 16px;
  background: var(--paper);
  border: var(--faq-line);
  border-top: 4px solid var(--cyan);
  box-shadow: 4px 4px 0 rgba(12, 59, 46, 0.1);
}

.page-faq .faq-alert-card:nth-child(2) {
  border-top-color: var(--orange);
}

.page-faq .faq-alert-card:nth-child(3) {
  border-top-color: var(--green);
}

.page-faq .faq-alert-card h3 {
  margin: 0 0 6px;
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 18px;
  letter-spacing: 0.01em;
}

.page-faq .faq-alert-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
}

/* ---------- 联系方式 ---------- */
.page-faq .faq-contact-list {
  display: grid;
  gap: 10px;
  margin: 0 0 16px;
  padding: 0;
  list-style: none;
}

.page-faq .faq-contact-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 4px 12px;
  align-items: center;
  padding: 12px 14px;
  background: var(--paper);
  border: var(--faq-line);
}

.page-faq .faq-contact-label {
  grid-column: 1 / -1;
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-faq .faq-contact-value {
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 14px;
  overflow-wrap: anywhere;
}

.page-faq .faq-copy {
  min-height: 44px;
  padding: 0 16px;
  border: var(--faq-line);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background-color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-faq .faq-copy:hover {
  border-color: var(--green);
  background: var(--mist);
}

.page-faq .faq-copy:focus-visible {
  outline: 3px solid var(--lime);
  outline-offset: 2px;
}

.page-faq .faq-help-note {
  margin: 0 0 18px;
  font-size: 14px;
  color: var(--grey-900);
}

.page-faq .faq-help-cta {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

/* ---------- 追问区 ---------- */
.page-faq .faq-extras {
  padding-block: var(--faq-pad);
}

.page-faq .faq-extras h2 {
  margin: 10px 0 22px;
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(22px, 3.4vw, 30px);
  line-height: 1.2;
}

.page-faq .faq-accordion {
  border-top: var(--faq-line);
}

.page-faq .faq-accordion details {
  border-bottom: var(--faq-line);
}

.page-faq .faq-accordion summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 44px;
  padding: 16px 2px;
  color: var(--ink);
  font-weight: 600;
  font-size: 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-accordion summary::after {
  content: "＋";
  flex: 0 0 auto;
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 16px;
}

.page-faq .faq-accordion details[open] summary::after {
  content: "－";
  color: var(--orange);
}

.page-faq .faq-accordion summary:focus-visible {
  outline: 3px solid var(--lime);
  outline-offset: -3px;
}

.page-faq .faq-accordion details p {
  margin: 0 0 18px;
  max-width: 62ch;
  padding-left: 14px;
  border-left: 3px solid var(--cyan);
  font-size: 15px;
  color: var(--grey-900);
}

/* ---------- 返回 ---------- */
.page-faq .faq-back {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: 8px;
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  text-decoration: none;
  border-bottom: 2px solid var(--cyan);
}

.page-faq .faq-back:hover {
  color: var(--ink);
}

.page-faq .faq-back:focus-visible {
  outline: 3px solid var(--lime);
  outline-offset: 3px;
}

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

@media (min-width: 880px) {
  .page-faq .faq-section-head {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 0 24px;
  }

  .page-faq .faq-body--with-media {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-faq .faq-switch {
    padding: 18px;
  }

  .page-faq .faq-switch-panel {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: center;
    gap: 20px;
  }

  .page-faq .faq-index-list {
    flex-wrap: wrap;
    overflow-x: visible;
  }
}

@media (min-width: 1080px) {
  .page-faq .faq-masthead h1 {
    font-size: clamp(48px, 5vw, 68px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index-list a,
  .page-faq .faq-switch-tab,
  .page-faq .faq-copy {
    transition: none;
  }

  .page-faq .faq-index-list a:hover {
    transform: none;
  }
}
<<<END>>>