/* ===== 使用指南 / page-faq ===== */
.page-faq {
  --faq-read: 680px;
  --faq-index-w: 264px;
  background: var(--night);
  color: var(--snow);
  overflow-x: clip;
  padding-bottom: clamp(64px, 9vw, 120px);
}

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 44px) 0 clamp(44px, 7vw, 84px);
  background:
    radial-gradient(90% 70% at 88% -12%, rgba(200, 16, 46, 0.36), transparent 62%),
    radial-gradient(70% 60% at 6% 0%, rgba(0, 214, 164, 0.12), transparent 60%),
    linear-gradient(180deg, var(--deep) 0%, var(--night) 100%);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(143, 163, 200, 0.1) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(143, 163, 200, 0.1) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 78%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 78%);
  pointer-events: none;
}

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

.page-faq .faq-hero h1 {
  margin: 14px 0 0;
  max-width: 17em;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.9rem, 5.6vw, 3.3rem);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--snow);
}

.page-faq .faq-hero__lead {
  max-width: 40em;
  margin: 20px 0 0;
  font-size: clamp(1rem, 1.4vw, 1.12rem);
  line-height: 1.85;
  color: rgba(244, 247, 255, 0.84);
}

.page-faq .faq-hero__jump {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-faq .faq-hero__jump a {
  display: inline-block;
  padding: 9px 17px;
  border-radius: 999px;
  border: 1px solid var(--ridge);
  background: rgba(16, 34, 74, 0.6);
  color: var(--snow);
  font-size: 0.9rem;
  text-decoration: none;
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-faq .faq-hero__jump a:hover,
.page-faq .faq-hero__jump a:focus-visible {
  border-color: var(--banner);
  background: rgba(242, 183, 5, 0.14);
}

.page-faq .faq-hero__media {
  margin: clamp(30px, 5vw, 54px) 0 0;
  border-radius: var(--radius);
  overflow: hidden;
}

.page-faq .faq-block__media {
  margin: 26px 0 0;
  border-radius: var(--radius);
  overflow: hidden;
}

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

/* 双栏手册布局 */
.page-faq .faq-body {
  padding: clamp(44px, 7vw, 86px) 0 0;
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
}

.page-faq .faq-index {
  border-top: 2px solid var(--saffron);
  padding-top: 18px;
}

.page-faq .faq-index__group {
  margin: 22px 0 10px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-faq .faq-index__group:first-of-type {
  margin-top: 0;
}

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

.page-faq .faq-index__list a {
  display: grid;
  grid-template-columns: 2.4em minmax(0, 1fr);
  gap: 4px;
  padding: 9px 8px 9px 12px;
  border-left: 2px solid var(--ridge);
  color: rgba(244, 247, 255, 0.78);
  font-size: 0.94rem;
  line-height: 1.5;
  text-decoration: none;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-faq .faq-index__list a:hover,
.page-faq .faq-index__list a:focus-visible {
  border-left-color: var(--banner);
  background: rgba(27, 58, 107, 0.4);
  color: var(--snow);
}

.page-faq .faq-index__list a[aria-current="location"] {
  border-left-color: var(--saffron);
  background: rgba(200, 16, 46, 0.14);
  color: var(--snow);
}

.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--banner);
  padding-top: 3px;
}

/* 答案区 */
.page-faq .faq-answers {
  max-width: var(--faq-read);
}

.page-faq .faq-block,
.page-faq .faq-cat {
  scroll-margin-top: calc(var(--header-h) + 28px);
}

.page-faq .faq-block + .faq-block {
  margin-top: clamp(54px, 8vw, 94px);
}

.page-faq .faq-block h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.4rem, 3.4vw, 2rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--snow);
}

.page-faq .faq-block__intro {
  margin: 16px 0 0;
  line-height: 1.85;
  color: rgba(244, 247, 255, 0.82);
}

/* 步骤流程 */
.page-faq .faq-steps {
  list-style: none;
  counter-reset: faq-step;
  margin: 28px 0 0;
  padding: 0;
}

.page-faq .faq-steps > li {
  position: relative;
  counter-increment: faq-step;
  padding: 4px 0 24px 54px;
  line-height: 1.8;
  color: rgba(244, 247, 255, 0.86);
}

.page-faq .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-radius: 50%;
  background: var(--layer);
  border: 1px solid var(--ridge);
  color: var(--banner);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
}

.page-faq .faq-steps > li::after {
  content: "";
  position: absolute;
  left: 17px;
  top: 42px;
  bottom: 4px;
  width: 1px;
  background: linear-gradient(180deg, var(--ridge), transparent);
}

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

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

/* 要点列表 */
.page-faq .faq-points {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-faq .faq-points li {
  display: grid;
  gap: 5px;
  padding: 16px 18px;
  border-radius: var(--radius);
  background: var(--layer);
  border-left: 3px solid var(--jade);
}

.page-faq .faq-points li:nth-child(2n) {
  border-left-color: var(--banner);
}

.page-faq .faq-points li:nth-child(3n) {
  border-left-color: var(--ember);
}

.page-faq .faq-points strong {
  font-weight: 700;
  color: var(--snow);
}

.page-faq .faq-points span {
  color: rgba(244, 247, 255, 0.72);
  font-size: 0.94rem;
  line-height: 1.7;
}

.page-faq .faq-points a {
  color: var(--banner);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-points--check li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 13px 0;
  background: transparent;
  border-left: 0;
  border-top: 1px dashed var(--ridge);
  border-radius: 0;
  color: rgba(244, 247, 255, 0.82);
  font-size: 0.95rem;
}

.page-faq .faq-points--check li::before {
  content: "";
  flex: 0 0 8px;
  width: 8px;
  height: 8px;
  background: var(--saffron);
  transform: rotate(45deg) translateY(-1px);
}

/* 三条排名路径 */
.page-faq .faq-routes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 28px;
}

.page-faq .faq-route {
  padding: 22px 20px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--ridge);
  background: linear-gradient(180deg, rgba(16, 34, 74, 0.95), rgba(10, 22, 51, 0.95));
}

.page-faq .faq-route:nth-child(1) {
  border-top: 3px solid var(--saffron);
}

.page-faq .faq-route:nth-child(2) {
  border-top: 3px solid var(--banner);
}

.page-faq .faq-route:nth-child(3) {
  border-top: 3px solid var(--jade);
}

.page-faq .faq-route__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--banner);
}

.page-faq .faq-route h3 {
  margin: 10px 0 0;
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--snow);
}

.page-faq .faq-route p {
  margin: 10px 0 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: rgba(244, 247, 255, 0.74);
}

.page-faq .faq-block__note {
  margin: 20px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--ridge);
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--mist);
}

/* 分类问答 */
.page-faq .faq-block--topics {
  padding: clamp(22px, 4vw, 38px);
  border-radius: var(--radius);
  border: 1px solid var(--ridge);
  background: rgba(16, 34, 74, 0.5);
}

.page-faq .faq-cat {
  margin-top: 32px;
}

.page-faq .faq-cat h3 {
  margin: 0 0 8px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 1rem;
  font-weight: 700;
}

.page-faq .faq-item {
  border-bottom: 1px solid var(--ridge);
}

.page-faq .faq-item > summary {
  position: relative;
  list-style: none;
  cursor: pointer;
  padding: 15px 38px 15px 2px;
  font-size: 0.98rem;
  font-weight: 600;
  line-height: 1.6;
  color: var(--snow);
  transition: color 0.18s var(--ease);
}

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

.page-faq .faq-item > summary::after {
  content: "+";
  position: absolute;
  right: 6px;
  top: 13px;
  font-family: var(--font-mono);
  font-size: 1.2rem;
  line-height: 1;
  color: var(--banner);
}

.page-faq .faq-item[open] > summary::after {
  content: "–";
  color: var(--saffron);
}

.page-faq .faq-item > summary:hover,
.page-faq .faq-item > summary:focus-visible {
  color: var(--banner);
}

.page-faq .faq-item__body {
  padding: 0 2px 18px;
}

.page-faq .faq-item[open] > .faq-item__body {
  animation: faq-drop 0.26s var(--ease);
}

.page-faq .faq-item__body p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: rgba(244, 247, 255, 0.76);
}

@keyframes faq-drop {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* 反馈收尾 */
.page-faq .faq-block--support p {
  margin: 20px 0 0;
  line-height: 1.85;
  color: rgba(244, 247, 255, 0.82);
}

.page-faq .faq-block--support a {
  color: var(--banner);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 平板与桌面 */
@media (min-width: 720px) {
  .page-faq .faq-routes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 980px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    gap: clamp(40px, 6vw, 88px);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--header-h) + 32px);
  }

  .page-faq .faq-answers {
    padding-top: 6px;
  }
}

@media (max-width: 479px) {
  .page-faq .faq-hero__jump a {
    padding: 8px 14px;
    font-size: 0.85rem;
  }

  .page-faq .faq-steps > li {
    padding-left: 46px;
  }
}