.page-faq {
  --faq-pad-y: clamp(32px, 5vw, 64px);
  --faq-cut: 18px;
  position: relative;
  isolation: isolate;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.75;
}

.page-faq::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 560px;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(70% 88% at 84% 0%, rgba(53, 224, 208, 0.13), transparent 62%),
    radial-gradient(62% 78% at 4% 4%, rgba(255, 107, 74, 0.14), transparent 60%);
}

.page-faq .faq-shell {
  padding-top: 24px;
  padding-bottom: var(--faq-pad-y);
}

.page-faq .faq-mono {
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
}

/* 面包屑 */
.page-faq .faq-crumb {
  margin: 0 0 22px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.page-faq .faq-crumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-crumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-crumb a:hover,
.page-faq .faq-crumb a:focus-visible {
  color: var(--foam);
  border-bottom-color: var(--coral);
}

.page-faq .faq-crumb li[aria-current="page"] {
  color: var(--coral);
}

/* 首屏 */
.page-faq .faq-hero {
  display: grid;
  gap: 18px;
  padding-bottom: clamp(36px, 5vw, 56px);
}

.page-faq .faq-hero__frame {
  position: relative;
  padding: clamp(22px, 3.4vw, 42px);
  background: linear-gradient(158deg, rgba(15, 65, 96, 0.94), rgba(6, 24, 38, 0.97));
  border: 1px solid var(--line-strong);
  clip-path: polygon(0 0, calc(100% - 30px) 0, 100% 30px, 100% 100%, 30px 100%, 0 calc(100% - 30px));
}

.page-faq .faq-hero__frame::before {
  content: "";
  position: absolute;
  top: 12px;
  left: 14px;
  right: 44px;
  height: 9px;
  opacity: 0.34;
  pointer-events: none;
  background-image: linear-gradient(90deg, var(--mist) 0 1px, transparent 1px 100%);
  background-size: 15px 100%;
}

.page-faq .faq-hero__kicker {
  margin: 10px 0 0;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(32px, 5.4vw, 58px);
  font-weight: 250;
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--foam);
}

.page-faq .faq-hero__lede {
  margin: 18px 0 0;
  max-width: 34em;
  color: var(--text-dim);
  font-size: 15px;
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-faq .faq-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 20px;
  font-size: 13px;
  font-family: var(--font-body);
  letter-spacing: 0.02em;
  text-decoration: none;
  border-radius: 0;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
  transition: transform var(--dur) var(--ease), filter var(--dur) var(--ease);
}

.page-faq .faq-btn:hover,
.page-faq .faq-btn:focus-visible {
  transform: translateY(-2px);
  filter: brightness(1.08);
}

.page-faq .faq-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 16px;
  margin: 28px 0 0;
  padding: 0;
}

.page-faq .faq-hero__stats > div {
  padding-left: 12px;
  border-left: 2px solid rgba(53, 224, 208, 0.55);
}

.page-faq .faq-hero__stats dt {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-faq .faq-hero__stats dd {
  margin: 0;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--foam);
}

.page-faq .faq-hero__stats dd span {
  font-family: var(--font-mono);
  color: var(--coral);
}

.page-faq .faq-hero__media {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  clip-path: polygon(28px 0, 100% 0, 100% 100%, 0 100%, 0 28px);
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 240px;
  max-width: 100%;
  object-fit: cover;
}

/* 章节 */
.page-faq .faq-sec {
  padding: clamp(34px, 5vw, 64px) 0;
  border-top: 1px solid var(--line);
}

.page-faq .faq-sec__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 18px;
  margin-bottom: 26px;
}

.page-faq .faq-sec__num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 54px);
  font-weight: 200;
  line-height: 1;
  letter-spacing: 0.02em;
  color: rgba(185, 214, 228, 0.26);
}

.page-faq .faq-sec__text {
  min-width: 0;
  flex: 1 1 300px;
}

.page-faq .faq-sec__kicker {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--coral);
}

.page-faq .faq-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 3.1vw, 31px);
  font-weight: 400;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--foam);
}

.page-faq .faq-sec__note {
  margin: 8px 0 0;
  max-width: 40em;
  font-size: 13.5px;
  color: var(--text-dim);
}

/* 主题轨道 + 问答 */
.page-faq .faq-board {
  display: grid;
  gap: 18px;
}

.page-faq .faq-rail {
  padding: 16px;
  background: var(--trench);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
}

.page-faq .faq-rail__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-rail__filters {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}

.page-faq .faq-filter {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  flex: none;
  padding: 10px 12px;
  background: transparent;
  border: 1px solid transparent;
  border-bottom: 2px solid transparent;
  color: var(--text-dim);
  font-family: var(--font-body);
  font-size: 13.5px;
  text-align: left;
  white-space: nowrap;
  cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.page-faq .faq-filter__num {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
  transition: color var(--dur) var(--ease);
}

.page-faq .faq-filter:hover {
  background: rgba(53, 224, 208, 0.08);
  color: var(--foam);
}

.page-faq .faq-filter:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-faq .faq-filter[aria-pressed="true"] {
  background: rgba(53, 224, 208, 0.12);
  border-bottom-color: var(--cyan);
  color: var(--foam);
}

.page-faq .faq-filter[aria-pressed="true"] .faq-filter__num {
  color: var(--cyan);
}

.page-faq .faq-rail__note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .faq-list {
  display: grid;
  gap: 10px;
}

.page-faq .faq-item {
  background: linear-gradient(180deg, rgba(15, 65, 96, 0.58), rgba(11, 42, 63, 0.8));
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .faq-item:hover {
  border-color: var(--line-strong);
}

.page-faq .faq-item[open] {
  border-color: rgba(255, 107, 74, 0.5);
  background: linear-gradient(180deg, rgba(15, 65, 96, 0.8), rgba(11, 42, 63, 0.92));
}

.page-faq .faq-item__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
}

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

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

.page-faq .faq-item__num {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-faq .faq-item__q {
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--foam);
}

.page-faq .faq-item__sign {
  position: relative;
  flex: none;
  width: 20px;
  height: 20px;
  border: 1px solid rgba(255, 107, 74, 0.65);
  border-radius: 50%;
}

.page-faq .faq-item__sign::before,
.page-faq .faq-item__sign::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 4px;
  right: 4px;
  height: 1px;
  background: var(--coral);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.page-faq .faq-item__sign::after {
  transform: rotate(90deg);
}

.page-faq .faq-item[open] .faq-item__sign::after {
  transform: rotate(0deg);
  opacity: 0;
}

.page-faq .faq-item__body {
  padding: 13px 18px 18px;
  border-top: 1px solid var(--line);
}

.page-faq .faq-item[open] .faq-item__body {
  animation: faq-slide-in 220ms var(--ease) both;
}

@keyframes faq-slide-in {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-faq .faq-item__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
  max-width: 40em;
}

.page-faq .faq-item__link {
  display: inline-block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 208, 0.45);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-item__link:hover,
.page-faq .faq-item__link:focus-visible {
  color: var(--foam);
  border-bottom-color: var(--foam);
}

/* 主题色 */
.page-faq .faq-item[data-tag="access"] .faq-item__num { color: var(--mist); }
.page-faq .faq-item[data-tag="schedule"] .faq-item__num { color: var(--shallow); }
.page-faq .faq-item[data-tag="score"] .faq-item__num { color: var(--coral); }
.page-faq .faq-item[data-tag="fav"] .faq-item__num { color: var(--cyan); }
.page-faq .faq-item[data-tag="version"] .faq-item__num { color: var(--coral-soft); }
.page-faq .faq-item[data-tag="feedback"] .faq-item__num { color: var(--foam); }
.page-faq .faq-item[data-tag="data"] .faq-item__num { color: var(--mist); }

/* 反馈流程 */
.page-faq .flow-grid {
  display: grid;
  gap: 18px;
}

.page-faq .flow-steps {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.page-faq .flow-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 16px 18px;
  background: var(--trench);
  border-left: 3px solid rgba(53, 224, 208, 0.6);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .flow-step:hover {
  background: rgba(15, 65, 96, 0.85);
  border-left-color: var(--coral);
}

.page-faq .flow-step__num {
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1.3;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-faq .flow-step h3 {
  margin: 0 0 5px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--foam);
}

.page-faq .flow-step p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-faq .flow-side {
  display: grid;
  gap: 14px;
}

.page-faq .faq-figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}

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

.page-faq .flow-note {
  padding: 18px;
  background: rgba(15, 65, 96, 0.6);
  border: 1px dashed rgba(185, 214, 228, 0.32);
}

.page-faq .flow-note__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--coral-soft);
}

.page-faq .flow-note ul {
  margin: 0 0 16px;
  padding-left: 16px;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-faq .flow-note li + li {
  margin-top: 6px;
}

/* 设备与版本 */
.page-faq .device-grid {
  display: grid;
  gap: 12px;
}

.page-faq .device-card {
  position: relative;
  padding: 20px 18px;
  background: linear-gradient(165deg, rgba(11, 42, 63, 0.95), rgba(6, 24, 38, 0.95));
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}

.page-faq .device-card__tag {
  display: inline-block;
  margin: 0 0 12px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--ink);
  background: var(--coral);
}

.page-faq .device-card:nth-child(2) .device-card__tag {
  background: var(--cyan);
}

.page-faq .device-card:nth-child(3) .device-card__tag {
  background: var(--coral-soft);
}

.page-faq .device-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--foam);
}

.page-faq .device-card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-faq .version-strip {
  display: grid;
  gap: 16px;
  margin-top: 14px;
  padding: 20px;
  background:
    linear-gradient(120deg, rgba(255, 107, 74, 0.16), rgba(53, 224, 208, 0.12) 66%, transparent);
  border: 1px solid var(--line-strong);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-faq .version-strip__label {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-faq .version-strip__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.1;
  color: var(--foam);
}

.page-faq .version-strip__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-faq .version-strip__btn {
  justify-self: start;
}

/* 数据与联系 */
.page-faq .help-grid {
  display: grid;
  gap: 12px;
}

.page-faq .help-card {
  display: block;
  padding: 20px 18px;
  background: var(--trench);
  border: 1px solid var(--line);
  text-decoration: none;
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.page-faq .help-card:hover,
.page-faq .help-card:focus-visible {
  background: rgba(15, 65, 96, 0.9);
  border-color: rgba(53, 224, 208, 0.5);
  transform: translateY(-2px);
}

.page-faq .help-card__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink);
  background: var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
}

.page-faq .help-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 16.5px;
  font-weight: 700;
  color: var(--foam);
}

.page-faq .help-card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-faq .help-card__go {
  display: inline-block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--coral);
}

.page-faq .contact-strip {
  display: grid;
  gap: 16px;
  margin-top: 16px;
  padding: 22px;
  background: var(--foam);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 18px 100%, 0 calc(100% - 18px));
}

.page-faq .contact-strip__block {
  min-width: 0;
}

.page-faq .contact-strip__label {
  margin: 0 0 5px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #4C6B7E;
}

.page-faq .contact-strip__value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--ink);
  word-break: break-word;
}

.page-faq .contact-strip__note {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid rgba(7, 19, 28, 0.16);
  font-size: 13px;
  line-height: 1.75;
  color: #2A4759;
}

/* 平板及以上 */
@media (min-width: 720px) {
  .page-faq .faq-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .device-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-faq .contact-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px 24px;
  }

  .page-faq .contact-strip__note {
    grid-column: 1 / -1;
  }

  .page-faq .version-strip {
    grid-template-columns: minmax(0, 0.5fr) minmax(0, 1fr) auto;
    align-items: center;
    gap: 20px;
  }

  .page-faq .version-strip__btn {
    justify-self: end;
  }
}

/* 桌面端双栏 */
@media (min-width: 900px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: stretch;
    gap: 26px;
  }

  .page-faq .flow-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
    gap: 26px;
    align-items: start;
  }
}

@media (min-width: 980px) {
  .page-faq .faq-board {
    grid-template-columns: 246px minmax(0, 1fr);
    gap: 28px;
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 24px;
    padding: 18px;
  }

  .page-faq .faq-rail__filters {
    display: grid;
    gap: 4px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-filter {
    width: 100%;
    white-space: normal;
    border-bottom: none;
    border-left: 3px solid transparent;
  }

  .page-faq .faq-filter[aria-pressed="true"] {
    border-left-color: var(--cyan);
    border-bottom-color: transparent;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item[open] .faq-item__body {
    animation: none;
  }

  .page-faq .faq-btn:hover,
  .page-faq .help-card:hover {
    transform: none;
  }
}
<<<END>>>