/* ===== 查阅教程页 · page-faq ===== */
.page-faq {
  --faq-sticky-top: calc(var(--nav-pad) + 18px);
  display: block;
  background:
    radial-gradient(1100px 620px at 10% -10%, rgba(44, 122, 85, 0.20), transparent 62%),
    var(--c-base);
  color: var(--c-text);
  padding-bottom: clamp(40px, 6vw, 84px);
}

.page-faq .crumbs {
  padding-top: clamp(14px, 2.4vw, 24px);
  margin-bottom: clamp(14px, 2.6vw, 26px);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-text-dim);
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-faq .crumbs a {
  color: var(--c-concrete);
  text-decoration: none;
  transition: color var(--dur-fast) ease;
}

.page-faq .crumbs a:hover,
.page-faq .crumbs a:focus-visible {
  color: var(--c-neon);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 5vw, 54px) clamp(18px, 4vw, 46px) clamp(24px, 4vw, 46px);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-l);
  background:
    linear-gradient(122deg, rgba(44, 122, 85, 0.36) 0%, rgba(44, 122, 85, 0) 48%),
    linear-gradient(300deg, rgba(255, 107, 53, 0.16) 0%, rgba(255, 107, 53, 0) 42%),
    linear-gradient(180deg, var(--c-home), var(--c-base));
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(0deg, rgba(154, 163, 160, 0.10) 0 1px, transparent 1px 46px),
    repeating-linear-gradient(90deg, rgba(154, 163, 160, 0.08) 0 1px, transparent 1px 46px);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.6), transparent 84%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.6), transparent 84%);
}

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

.page-faq .faq-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  font-size: clamp(2.05rem, 7.4vw, 4.6rem);
  line-height: 1.06;
  color: var(--c-text);
}

.page-faq .faq-hero__lead {
  margin: 16px 0 0;
  max-width: 46em;
  font-size: clamp(0.98rem, 1.8vw, 1.1rem);
  line-height: 1.78;
  color: var(--c-text-dim);
}

.page-faq .faq-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(20px, 3.4vw, 30px);
}

.page-faq .faq-jump a {
  display: inline-flex;
  align-items: center;
  padding: 7px 13px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-s);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-text-dim);
  text-decoration: none;
  transition: color var(--dur-fast) ease, border-color var(--dur-fast) ease, transform var(--dur-fast) ease;
}

.page-faq .faq-jump a:hover,
.page-faq .faq-jump a:focus-visible {
  color: var(--c-neon);
  border-color: rgba(62, 224, 192, 0.55);
  transform: translateY(-2px);
}

/* ---------- 主体网格 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(30px, 5vw, 58px);
}

.page-faq .faq-nav {
  align-self: start;
  padding: clamp(16px, 2.6vw, 22px);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-l);
  background: linear-gradient(180deg, rgba(20, 72, 58, 0.55), rgba(10, 30, 25, 0.32));
}

.page-faq .faq-nav__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-concrete);
}

.page-faq .faq-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
}

.page-faq .faq-nav__list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 0;
  font-size: 14px;
  line-height: 1.45;
  color: var(--c-text-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur-fast) ease, border-color var(--dur-fast) ease;
}

.page-faq .faq-nav__list a:hover,
.page-faq .faq-nav__list a:focus-visible {
  color: var(--c-neon);
  border-bottom-color: rgba(62, 224, 192, 0.5);
}

.page-faq .faq-nav__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-concrete);
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  padding-top: clamp(18px, 3vw, 30px);
  border-top: 1px solid var(--c-line);
  scroll-margin-top: calc(var(--nav-pad) + 18px);
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(32px, 5vw, 58px);
}

.page-faq .faq-group__head {
  margin-bottom: clamp(16px, 2.4vw, 24px);
}

.page-faq .faq-group__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--c-concrete);
}

.page-faq .faq-group__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.01em;
  font-size: clamp(1.5rem, 3.6vw, 2.35rem);
  line-height: 1.18;
  color: var(--c-text);
}

.page-faq .faq-group__lead {
  margin: 10px 0 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--c-text-dim);
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa {
  border: 1px solid var(--c-line);
  border-radius: var(--radius-m);
  background: linear-gradient(180deg, rgba(20, 72, 58, 0.38), rgba(10, 30, 25, 0.22));
  transition: border-color var(--dur) ease, background-color var(--dur) ease;
}

.page-faq .qa + .qa {
  margin-top: 10px;
}

.page-faq .qa[open] {
  border-color: rgba(62, 224, 192, 0.44);
}

.page-faq .qa:hover {
  border-color: rgba(154, 163, 160, 0.48);
}

.page-faq .qa__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px clamp(14px, 2.4vw, 20px);
  cursor: pointer;
  list-style: none;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: clamp(0.95rem, 1.7vw, 1.02rem);
  line-height: 1.55;
  color: var(--c-text);
  transition: color var(--dur-fast) ease;
}

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

.page-faq .qa__q::after {
  content: "+";
  margin-left: auto;
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  line-height: 1.2;
  color: var(--c-neon);
  transition: color var(--dur-fast) ease;
}

.page-faq .qa[open] .qa__q::after {
  content: "\2212";
  color: var(--c-orange);
}

.page-faq .qa__q:focus-visible {
  outline: 2px solid var(--c-neon);
  outline-offset: -2px;
}

.page-faq .qa__num {
  flex: 0 0 auto;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-concrete);
}

.page-faq .qa__a {
  padding: 0 clamp(14px, 2.4vw, 20px) 18px;
  animation: faq-open var(--dur) ease both;
}

.page-faq .qa__a p {
  margin: 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-text-dim);
}

.page-faq .qa__a p + p {
  margin-top: 10px;
}

.page-faq .qa__a a {
  color: var(--c-neon);
  text-decoration: underline;
  text-underline-offset: 3px;
}

@keyframes faq-open {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 步骤 + 图示 ---------- */
.page-faq .faq-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3.4vw, 34px);
}

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

.page-faq .faq-step {
  position: relative;
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  padding-bottom: 22px;
}

.page-faq .faq-step::before {
  content: "";
  position: absolute;
  left: 22px;
  top: 40px;
  bottom: 0;
  width: 1px;
  background: var(--c-line);
}

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

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

.page-faq .faq-step__num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 30px;
  border: 1px solid rgba(62, 224, 192, 0.35);
  border-radius: var(--radius-s);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-neon);
  background: rgba(10, 30, 25, 0.6);
}

.page-faq .faq-step__body h3 {
  margin: 2px 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1rem, 2vw, 1.12rem);
  line-height: 1.4;
  color: var(--c-text);
}

.page-faq .faq-step__body p {
  margin: 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--c-text-dim);
}

/* ---------- 图片 ---------- */
.page-faq .faq-figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-l);
  background: linear-gradient(160deg, rgba(44, 122, 85, 0.24), rgba(10, 30, 25, 0.6));
}

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

.page-faq .faq-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--c-line-soft);
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-text-dim);
}

/* ---------- 收尾 ---------- */
.page-faq .faq-tail {
  margin-top: clamp(34px, 5.4vw, 62px);
  padding-top: clamp(24px, 3.6vw, 40px);
  border-top: 1px solid var(--c-line);
}

.page-faq .faq-figure--band {
  border-radius: var(--radius-l);
}

.page-faq .faq-tail__text {
  margin: 18px 0 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-text-dim);
}

/* ---------- 响应式 ---------- */
@media (min-width: 880px) {
  .page-faq .faq-split {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-figure {
    position: sticky;
    top: var(--faq-sticky-top);
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-body {
    grid-template-columns: minmax(0, 234px) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-nav {
    position: sticky;
    top: var(--faq-sticky-top);
  }

  .page-faq .faq-nav__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }

  .page-faq .faq-nav__list a {
    width: 100%;
    padding: 8px 0;
  }

  .page-faq .qa__a p,
  .page-faq .faq-group__lead,
  .page-faq .faq-hero__lead,
  .page-faq .faq-tail__text {
    font-size: 16px;
  }
}

@media (max-width: 640px) {
  .page-faq .faq-step {
    grid-template-columns: 38px minmax(0, 1fr);
    gap: 12px;
  }

  .page-faq .faq-step__num {
    width: 38px;
    height: 28px;
    font-size: 12px;
  }

  .page-faq .faq-step::before {
    left: 18px;
    top: 36px;
  }

  .page-faq .qa__q {
    gap: 9px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa__a {
    animation: none;
  }

  .page-faq .faq-jump a:hover,
  .page-faq .faq-jump a:focus-visible {
    transform: none;
  }
}
</main>