.page-faq {
  --faq-line: rgba(200, 162, 76, 0.30);
  --faq-line-soft: rgba(159, 176, 192, 0.18);
}

/* ============ 首屏 ============ */
.page-faq .faq-hero {
  position: relative;
  background: var(--night);
  padding: clamp(22px, 4vw, 40px) 0 clamp(34px, 6vw, 62px);
  overflow: hidden;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  top: -20%;
  width: 52%;
  height: 150%;
  background:
    linear-gradient(142deg,
      transparent 41.6%,
      rgba(200, 162, 76, 0.14) 41.8%,
      rgba(200, 162, 76, 0.14) 42.1%,
      transparent 42.3%);
  pointer-events: none;
}

.page-faq .faq-hero .shell {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(26px, 5vw, 46px);
  margin-top: clamp(24px, 4vw, 42px);
}

.page-faq .faq-hero__lead h1 {
  margin: 14px 0 0;
  font-size: clamp(29px, 6.4vw, 54px);
  line-height: 1.14;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--mist);
  max-width: 15ch;
}

.page-faq .faq-hero__lead .lede {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  max-width: 38ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--stone);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 30px);
}

/* ============ 设备切换条 ============ */
.page-faq .devbar {
  position: relative;
  background: var(--trench);
  border: 1px solid var(--faq-line);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
  padding: clamp(20px, 3vw, 28px);
}

.page-faq .devbar::before {
  content: "";
  display: block;
  height: 9px;
  margin: calc(clamp(20px, 3vw, 28px) * -1) calc(clamp(20px, 3vw, 28px) * -1) clamp(16px, 2vw, 22px);
  background-image: repeating-linear-gradient(90deg, var(--gold) 0 1px, transparent 1px 22px);
  opacity: 0.45;
}

.page-faq .devbar__title {
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--gold);
  text-transform: uppercase;
}

.page-faq .devbar__opts {
  position: relative;
  display: flex;
  gap: 10px;
}

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

.page-faq .devbar__opt {
  flex: 1 1 0;
  padding: 13px 10px;
  text-align: center;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--stone);
  background: rgba(10, 26, 42, 0.72);
  border: 1px solid var(--faq-line-soft);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
  transition: color 0.18s var(--ease), background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-faq .devbar__radio:checked + .devbar__opt {
  color: var(--night);
  background: var(--neon);
  border-color: var(--neon);
}

.page-faq .devbar__radio:focus-visible + .devbar__opt {
  outline: 2px solid var(--neon);
  outline-offset: 2px;
}

.page-faq .devbar__note {
  margin: 16px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--stone);
}

/* ============ 首屏索引 ============ */
.page-faq .hero-index {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  list-style: none;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--faq-line-soft);
}

.page-faq .hero-index a {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--stone);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-faq .hero-index a:hover,
.page-faq .hero-index a:focus-visible {
  color: var(--neon);
  border-bottom-color: var(--neon);
}

/* ============ 问答主体 ============ */
.page-faq .faq-main {
  background: var(--trench);
  padding: clamp(38px, 6vw, 80px) 0;
}

.page-faq .qa {
  background: var(--night);
  border: 1px solid var(--faq-line);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
  margin: 0 0 14px;
  transition: border-color 0.24s var(--ease);
}

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

.page-faq .qa[open] {
  border-color: rgba(63, 211, 190, 0.42);
}

.page-faq .qa__head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: clamp(16px, 2.4vw, 24px) clamp(16px, 3vw, 30px);
  cursor: pointer;
  list-style: none;
}

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

.page-faq .qa__num {
  flex: 0 0 auto;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  background: var(--deep-red);
  color: var(--mist);
  font-family: var(--mono);
  font-size: 15px;
  letter-spacing: 0.02em;
  clip-path: polygon(0 0, calc(100% - 11px) 0, 100% 11px, 100% 100%, 0 100%);
  transition: background 0.24s var(--ease), color 0.24s var(--ease);
}

.page-faq .qa__text {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}

.page-faq .qa__q {
  font-size: clamp(17px, 2.4vw, 21px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--mist);
}

.page-faq .qa__hint {
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--stone);
}

.page-faq .qa__chev {
  flex: 0 0 auto;
  margin-left: auto;
  align-self: center;
  width: 11px;
  height: 11px;
  border-right: 2px solid var(--gold);
  border-bottom: 2px solid var(--gold);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-faq .qa[open] .qa__chev {
  transform: rotate(225deg) translate(-2px, -2px);
  border-color: var(--neon);
}

.page-faq .qa__body {
  padding: 0 clamp(16px, 3vw, 30px) clamp(20px, 3vw, 32px);
}

.page-faq .qa__body::before {
  content: "";
  display: block;
  height: 1px;
  margin-bottom: clamp(18px, 2.6vw, 26px);
  background: linear-gradient(90deg, var(--deep-red) 0 64px, var(--faq-line-soft) 64px);
}

.page-faq .qa[open] .qa__body > * {
  animation: faq-rise 0.4s var(--ease) both;
}

@keyframes faq-rise {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-faq .qa__cols {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

/* 步骤 */
.page-faq .steps {
  list-style: none;
  counter-reset: faqstep;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 15px;
}

.page-faq .steps > li {
  counter-increment: faqstep;
  position: relative;
  padding-left: 48px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
}

.page-faq .steps > li::before {
  content: "0" counter(faqstep);
  position: absolute;
  left: 0;
  top: 3px;
  min-width: 30px;
  padding: 3px 5px;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.2;
  text-align: center;
  color: var(--gold);
  border: 1px solid var(--faq-line);
  background: rgba(140, 28, 43, 0.16);
}

.page-faq .steps a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 211, 190, 0.45);
}

.page-faq .steps a:hover {
  border-bottom-color: var(--neon);
}

.page-faq .steps .mono {
  color: var(--gold);
  font-size: 14px;
}

/* 配图 */
.page-faq .shot {
  margin: 0;
}

.page-faq .shot img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--faq-line);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.page-faq .shot--tall img {
  max-height: 460px;
}

.page-faq .shot__cap {
  margin: 10px 0 0;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--stone);
}

/* 设备切换高亮 */
.page-faq:has(#faq-dev-android:checked) .qa--android {
  border-color: var(--neon);
}

.page-faq:has(#faq-dev-android:checked) .qa--android .qa__num {
  background: var(--neon);
  color: var(--night);
}

.page-faq:has(#faq-dev-pc:checked) .qa--pc .qa__num {
  background: var(--gold);
  color: var(--night);
}

/* ============ 人工协助 ============ */
.page-faq .faq-help {
  background: var(--warm);
  color: var(--ink);
  padding: clamp(38px, 6vw, 80px) 0;
}

.page-faq .help-grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-faq .help-lead h2 {
  margin: 16px 0 0;
  font-size: clamp(23px, 3.6vw, 34px);
  line-height: 1.25;
  font-weight: 900;
  letter-spacing: -0.015em;
  color: var(--night);
  max-width: 20ch;
}

.page-faq .help-lead p {
  margin: 16px 0 0;
  max-width: 40ch;
  font-size: 16px;
  line-height: 1.78;
  color: #3c4b58;
}

.page-faq .help-card {
  background: #fff;
  border: 1px solid rgba(10, 26, 42, 0.14);
  border-top: 4px solid var(--deep-red);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
  padding: clamp(20px, 3vw, 32px);
}

.page-faq .help-card__label {
  margin: 0;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--deep-red);
}

.page-faq .help-list {
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-faq .help-list__row {
  display: grid;
  gap: 4px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(10, 26, 42, 0.1);
}

.page-faq .help-list__row dt {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: #6b7a88;
}

.page-faq .help-list__row dd {
  margin: 0;
  font-family: var(--mono);
  font-size: 15px;
  line-height: 1.6;
  color: var(--night);
  word-break: break-word;
}

.page-faq .help-card__note {
  margin: 18px 0 22px;
  font-size: 15px;
  line-height: 1.72;
  color: #3c4b58;
}

/* ============ 响应式 ============ */
@media (min-width: 720px) {
  .page-faq .hero-index {
    gap: 12px 30px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-faq .devbar {
    margin-top: 8px;
  }

  .page-faq .qa__cols {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .qa__cols--narrow-media {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-faq .help-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: start;
  }
}

@media (min-width: 1180px) {
  .page-faq .qa {
    margin-bottom: 18px;
  }

  .page-faq .qa__head {
    gap: 22px;
  }

  .page-faq .steps > li {
    padding-left: 58px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa[open] .qa__body > * {
    animation: none;
  }

  .page-faq .qa__chev,
  .page-faq .devbar__opt,
  .page-faq .qa__num {
    transition: none;
  }
}