.page-faq {
  --faq-rail-w: 268px;
  --faq-gap: clamp(28px, 4vw, 60px);
  --faq-hair: rgba(139, 144, 152, 0.2);
  scroll-behavior: smooth;
  background-color: var(--ink);
  background-image:
    linear-gradient(to right, var(--faq-hair) 1px, transparent 1px),
    linear-gradient(to bottom, var(--faq-hair) 1px, transparent 1px);
  background-size: var(--grid-cell) var(--grid-cell);
  color: var(--paper);
  padding-bottom: clamp(56px, 8vw, 120px);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  padding: clamp(40px, 7vw, 96px) 0 clamp(32px, 5vw, 56px);
}

.page-faq .faq-hero__title {
  margin: 20px 0 0;
  max-width: 17ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 6.2vw, 82px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-hero__lead {
  margin: 24px 0 0;
  max-width: var(--measure);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.85;
  color: rgba(245, 241, 232, 0.8);
}

.page-faq .faq-hero__band {
  margin: clamp(32px, 5vw, 56px) 0 0;
}

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

/* ---------- 主体栅格 ---------- */

.page-faq .faq-body {
  padding-top: clamp(20px, 3vw, 40px);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
  align-items: start;
}

.page-faq .faq-content {
  display: flex;
  flex-direction: column;
  gap: clamp(40px, 5.5vw, 76px);
  min-width: 0;
}

/* ---------- 左侧分类 ---------- */

.page-faq .faq-rail {
  border: 2px solid var(--paper);
  background: var(--tibet-blue);
  padding: 20px 18px;
  box-shadow: 6px 6px 0 var(--cinnabar-deep);
}

.page-faq .faq-rail__title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.14em;
  color: var(--banner-yellow);
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0 0 6px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 12px;
  border: 2px solid transparent;
  color: var(--paper);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  border-color: var(--banner-yellow);
  background: rgba(11, 13, 16, 0.4);
  outline: none;
}

.page-faq .faq-rail__link:focus-visible {
  outline: 2px solid var(--banner-yellow);
  outline-offset: 2px;
}

.page-faq .faq-rail__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--bronze);
}

.page-faq .faq-rail__label {
  flex: 1 1 auto;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
}

.page-faq .faq-rail__count {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(245, 241, 232, 0.6);
}

.page-faq .faq-rail__note {
  margin: 18px 0 0;
  padding-top: 16px;
  border-top: 1px solid rgba(245, 241, 232, 0.25);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.8;
  color: rgba(245, 241, 232, 0.7);
}

.page-faq .faq-rail__note .text-link {
  color: var(--banner-yellow);
}

.page-faq .faq-rail__note .text-link:hover {
  color: var(--paper);
}

/* ---------- 分组头 ---------- */

.page-faq .faq-group {
  scroll-margin-top: 130px;
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 16px;
  align-items: baseline;
  padding-bottom: 16px;
  margin-bottom: 24px;
  border-bottom: 2px solid rgba(245, 241, 232, 0.26);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 2.8vw, 34px);
  line-height: 1.22;
  color: var(--paper);
}

.page-faq .faq-group__note {
  grid-column: 1 / -1;
  margin: 6px 0 0;
  max-width: var(--measure);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.85;
  color: rgba(245, 241, 232, 0.7);
}

/* ---------- 问答手风琴 ---------- */

.page-faq .qa {
  border: 2px solid var(--paper);
  background: var(--paper);
  color: var(--ink);
  box-shadow: 5px 5px 0 var(--cinnabar-deep);
  margin-bottom: 16px;
  transition: box-shadow 0.22s var(--ease), transform 0.22s var(--ease);
}

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

.page-faq .qa:hover {
  box-shadow: 8px 8px 0 var(--cinnabar-deep);
  transform: translateY(-2px);
}

.page-faq .qa[open] {
  box-shadow: 8px 8px 0 var(--cinnabar);
  transform: none;
}

.page-faq .qa__summary {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.62;
  color: var(--ink);
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease);
}

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

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

.page-faq .qa__summary:focus-visible {
  outline: 3px solid var(--sky);
  outline-offset: -4px;
}

.page-faq .qa__num {
  flex: 0 0 auto;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border: 2px solid var(--ink);
  border-radius: 50%;
  background: var(--paper);
  color: var(--cinnabar);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .qa__q {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .qa__mark {
  flex: 0 0 auto;
  position: relative;
  width: 18px;
  height: 18px;
  margin-top: 7px;
}

.page-faq .qa__mark::before,
.page-faq .qa__mark::after {
  content: "";
  position: absolute;
  background: var(--cinnabar);
  transition: transform 0.22s var(--ease), opacity 0.22s var(--ease), background-color 0.2s var(--ease);
}

.page-faq .qa__mark::before {
  left: 0;
  right: 0;
  top: 8px;
  height: 2px;
}

.page-faq .qa__mark::after {
  top: 0;
  bottom: 0;
  left: 8px;
  width: 2px;
}

.page-faq .qa[open] > .qa__summary {
  background: var(--ink);
  color: var(--paper);
}

.page-faq .qa[open] > .qa__summary .qa__num {
  background: var(--cinnabar);
  color: var(--paper);
  border-color: var(--paper);
}

.page-faq .qa[open] > .qa__summary .qa__mark::before,
.page-faq .qa[open] > .qa__summary .qa__mark::after {
  background: var(--banner-yellow);
}

.page-faq .qa[open] > .qa__summary .qa__mark::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-faq .qa__body {
  margin: 16px 18px 20px;
  padding: 2px 0 2px 16px;
  border-left: 4px solid var(--bronze);
}

.page-faq .qa__body p {
  margin: 0 0 12px;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

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

.page-faq .qa__body .text-link {
  color: var(--sky);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .qa__body .text-link:hover {
  color: var(--cinnabar);
}

.page-faq .key-mark {
  font-style: normal;
  font-weight: 700;
  color: var(--cinnabar-deep);
  border-bottom: 2px solid var(--cinnabar);
  padding-bottom: 1px;
}

/* ---------- 换设备 ---------- */

.page-faq .faq-device__figure {
  margin: 0 0 24px;
}

.page-faq .faq-panel {
  border: 2px solid var(--paper);
  background: var(--paper);
  color: var(--ink);
  padding: clamp(20px, 3vw, 34px);
  box-shadow: 6px 6px 0 var(--cinnabar-deep);
}

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

.page-faq .steps > li {
  position: relative;
  counter-increment: faq-step;
  padding-left: 58px;
  padding-bottom: 26px;
}

.page-faq .steps > li:last-child {
  padding-bottom: 0;
}

.page-faq .steps > li::before {
  content: counter(faq-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border: 2px solid var(--ink);
  border-radius: 50%;
  background: var(--paper);
  color: var(--cinnabar);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.page-faq .steps > li::after {
  content: "";
  position: absolute;
  left: 17px;
  top: 42px;
  bottom: 4px;
  width: 2px;
  background: var(--grey);
}

.page-faq .steps > li:last-child::after {
  display: none;
}

.page-faq .steps h3 {
  margin: 6px 0 8px;
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

.page-faq .steps p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--ink-soft);
}

.page-faq .steps .text-link {
  color: var(--sky);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .steps .text-link:hover {
  color: var(--cinnabar);
}

.page-faq .tip {
  margin: 26px 0 0;
  padding: 14px 16px;
  border-left: 6px solid var(--banner-yellow);
  background: rgba(240, 195, 52, 0.16);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 入口整理 ---------- */

.page-faq .collect-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-faq .collect-list > li {
  border: 2px solid var(--paper);
  background: var(--paper);
  color: var(--ink);
  padding: 18px 20px;
  box-shadow: 5px 5px 0 var(--cinnabar-deep);
}

.page-faq .collect-list h3 {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--cinnabar);
}

.page-faq .collect-list p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--ink-soft);
}

/* ---------- 联系区块 ---------- */

.page-faq .faq-contact {
  border: 2px solid var(--paper);
  background: var(--cinnabar-deep);
  padding: clamp(22px, 3.2vw, 38px);
  box-shadow: 7px 7px 0 var(--bronze);
}

.page-faq .faq-contact__head {
  border-bottom-color: rgba(245, 241, 232, 0.4);
  margin-bottom: 20px;
}

.page-faq .faq-contact__head .index-num {
  color: var(--banner-yellow);
}

.page-faq .faq-contact__lead {
  margin: 0 0 24px;
  max-width: var(--measure);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  color: rgba(245, 241, 232, 0.9);
}

.page-faq .contact-facts {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid rgba(245, 241, 232, 0.3);
}

.page-faq .contact-facts > li {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(245, 241, 232, 0.3);
}

.page-faq .contact-facts__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--banner-yellow);
}

.page-faq .contact-facts__v {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--paper);
  word-break: break-word;
}

.page-faq .faq-contact__ask h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--paper);
}

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

.page-faq .faq-contact__ask li {
  position: relative;
  padding-left: 22px;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(245, 241, 232, 0.9);
}

.page-faq .faq-contact__ask li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 10px;
  height: 10px;
  background: var(--banner-yellow);
}

.page-faq .faq-contact__cta {
  margin: 28px 0 0;
}

.page-faq .faq-contact__cta .btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-faq .collect-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .contact-facts > li {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: var(--faq-gap);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 112px;
    padding: 24px 22px;
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-rail__link {
    white-space: normal;
    padding: 10px 12px;
  }

  .page-faq .qa__summary {
    padding: 18px 22px;
    font-size: 17px;
  }

  .page-faq .qa__body {
    margin: 18px 22px 22px;
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-hero__title {
    max-width: 15ch;
  }

  .page-faq .collect-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq {
    scroll-behavior: auto;
  }

  .page-faq .qa,
  .page-faq .qa__summary,
  .page-faq .qa__num,
  .page-faq .qa__mark::before,
  .page-faq .qa__mark::after,
  .page-faq .faq-rail__link {
    transition: none;
  }

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