.page-faq {
  --faq-rail-w: 380px;
  --faq-gap: clamp(30px, 5vw, 80px);
  position: relative;
  padding-bottom: clamp(40px, 7vw, 100px);
  background: var(--ink);
  color: var(--haze);
  font-family: var(--font-sans);
}

.page-faq [id] {
  scroll-margin-top: clamp(90px, 12vw, 140px);
}

/* 面包屑 */
.page-faq .crumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  padding-top: clamp(92px, 13vw, 152px);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
  text-transform: uppercase;
}

.page-faq .crumb a {
  color: var(--mist);
  text-decoration: none;
}

.page-faq .crumb a:hover {
  color: var(--orange-soft);
}

.page-faq .crumb .crumb__sep {
  color: var(--line);
}

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

/* 首屏 */
.page-faq .faq-hero {
  padding: clamp(26px, 4.5vw, 56px) 0 clamp(28px, 4.5vw, 60px);
  background:
    radial-gradient(120% 90% at 84% 0%, rgba(255, 122, 47, 0.16), transparent 56%),
    radial-gradient(90% 80% at 4% 100%, rgba(108, 92, 231, 0.14), transparent 62%);
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: clamp(16px, 2.2vw, 26px);
}

.page-faq .faq-hero__title {
  margin: 0;
  max-width: 17ch;
  font-size: var(--step-3);
  font-weight: 200;
  line-height: 1.04;
  letter-spacing: -0.02em;
}

.page-faq .faq-hero__lede {
  margin: 0;
  max-width: 42ch;
  font-size: var(--step-1);
  line-height: 1.7;
  color: var(--mist);
}

/* 版本索引条 */
.page-faq .faq-meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: clamp(8px, 1.6vw, 18px);
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.page-faq .faq-meta__cell {
  display: grid;
  gap: 6px;
  align-content: start;
  min-width: 0;
  padding: 16px 14px 18px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(30, 58, 42, 0.22);
  color: inherit;
  text-decoration: none;
  transition: background 0.24s ease;
}

.page-faq a.faq-meta__cell:hover {
  background: rgba(255, 122, 47, 0.12);
}

.page-faq .faq-meta .stat__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist);
  text-transform: uppercase;
}

.page-faq .faq-meta .stat__num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.2vw, 28px);
  font-weight: 700;
  color: var(--haze);
}

.page-faq .faq-meta .stat__num--accent {
  color: var(--orange);
}

.page-faq .faq-meta__hint {
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist-dim);
}

/* 章节图 */
.page-faq .faq-banner {
  margin-bottom: clamp(34px, 5vw, 72px);
}

.page-faq .faq-banner img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: var(--pitch);
}

/* 双栏画布 */
.page-faq .faq-board {
  padding: clamp(6px, 1.5vw, 18px) 0 clamp(44px, 7vw, 96px);
}

.page-faq .faq-board__inner {
  display: grid;
  gap: var(--faq-gap);
  align-items: start;
}

.page-faq .faq-rail,
.page-faq .faq-qa {
  min-width: 0;
}

.page-faq .faq-rail__lede {
  margin: 12px 0 clamp(20px, 3vw, 30px);
  max-width: 40ch;
  font-size: var(--step-0);
  line-height: 1.75;
  color: var(--mist);
}

/* 时间线 */
.page-faq .faq-log {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-faq .faq-log::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--orange) 0%, var(--line) 34%, rgba(47, 90, 63, 0.22) 100%);
}

.page-faq .faq-log__item {
  position: relative;
  padding-bottom: clamp(20px, 3vw, 30px);
}

.page-faq .faq-log__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 7px;
  width: 11px;
  height: 11px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--ink);
}

.page-faq .faq-log__item.is-current::before {
  background: var(--orange);
  border-color: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 122, 47, 0.16);
}

.page-faq .faq-log__when {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: baseline;
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-faq .faq-log__num {
  font-size: 12px;
  font-weight: 700;
  color: var(--orange-soft);
}

.page-faq .faq-log__item.is-current .faq-log__num {
  color: var(--orange);
}

.page-faq .faq-log__title {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--haze);
}

.page-faq .faq-log__list {
  display: grid;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-log__list li {
  position: relative;
  padding-left: 14px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .faq-log__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 1px;
  background: var(--line);
}

/* 问答栏 */
.page-faq .faq-qa__head {
  padding-bottom: clamp(14px, 2vw, 22px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-qa__lede {
  margin: 12px 0 0;
  max-width: 46ch;
  font-size: var(--step-0);
  line-height: 1.75;
  color: var(--mist);
}

.page-faq .faq-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(14px, 2vw, 20px);
}

.page-faq .faq-jump a {
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
  text-decoration: none;
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.page-faq .faq-jump a:hover {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
}

.page-faq .faq-group {
  padding-top: clamp(24px, 3.5vw, 40px);
}

.page-faq .faq-group__title {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0;
  font-size: clamp(19px, 2vw, 24px);
  font-weight: 600;
  color: var(--haze);
}

.page-faq .faq-group__title::before {
  content: "";
  display: inline-block;
  width: 22px;
  height: 1px;
  background: var(--orange);
}

.page-faq .faq-group__lede {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist-dim);
}

.page-faq .faq-figure {
  margin: clamp(14px, 2vw, 22px) 0 0;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: var(--pitch);
}

.page-faq .faq-figure figcaption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mist-dim);
}

.page-faq .faq-group > .faq-item:first-of-type {
  margin-top: clamp(12px, 2vw, 20px);
}

/* 问答条目 */
.page-faq .faq-item {
  border-top: 1px solid var(--line);
}

.page-faq .faq-item summary {
  position: relative;
  padding: 15px 44px 15px 0;
  font-size: 15.5px;
  line-height: 1.6;
  font-weight: 600;
  color: var(--haze);
  cursor: pointer;
  list-style: none;
  transition: color 0.2s ease;
}

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

.page-faq .faq-item summary:hover {
  color: var(--orange-soft);
}

.page-faq .faq-item summary::after {
  content: "＋";
  position: absolute;
  right: 0;
  top: 15px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 400;
  color: var(--orange);
}

.page-faq .faq-item[open] summary::after {
  content: "－";
}

.page-faq .faq-item__a {
  margin: 0 0 clamp(14px, 2vw, 20px);
  padding: clamp(14px, 2vw, 22px);
  border: 1px solid var(--line);
  background: var(--haze);
  color: var(--ink);
  overflow-wrap: break-word;
}

.page-faq .faq-item__a p {
  max-width: 42ch;
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.85;
}

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

.page-faq .faq-item__a a {
  color: var(--pitch);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid var(--orange);
}

.page-faq .faq-item__a a:hover {
  color: var(--orange);
}

.page-faq .faq-num {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--pitch);
}

/* 还需要帮助 */
.page-faq .faq-help {
  margin-top: clamp(36px, 6vw, 86px);
  padding: clamp(36px, 6vw, 78px) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(158deg, var(--pitch) 0%, var(--tier) 52%, var(--ink) 100%);
}

.page-faq .faq-help__inner {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  align-items: start;
}

.page-faq .faq-help__lede {
  margin: 12px 0 0;
  max-width: 40ch;
  font-size: var(--step-1);
  line-height: 1.75;
  color: var(--mist);
}

.page-faq .faq-help__contact {
  display: grid;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--haze);
  overflow-wrap: break-word;
}

.page-faq .faq-help__contact span {
  margin-top: 8px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist);
  text-transform: uppercase;
}

.page-faq .faq-help__note {
  margin: 10px 0 0;
  font-family: var(--font-sans);
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}

.page-faq .faq-help__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 2.5vw, 26px);
}

/* 响应式 */
@media (min-width: 640px) {
  .page-faq .faq-meta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 980px) {
  .page-faq .faq-board__inner {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: clamp(96px, 10vw, 128px);
    max-height: calc(100vh - clamp(124px, 14vw, 164px));
    overflow-y: auto;
    padding-right: 8px;
    scrollbar-width: thin;
  }

  .page-faq .faq-help__inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 64px);
  }
}

@media (max-width: 619px) {
  .page-faq .faq-log {
    padding-left: 22px;
  }

  .page-faq .faq-log__item::before {
    left: -22px;
  }

  .page-faq .faq-item summary {
    padding-right: 36px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-meta__cell,
  .page-faq .faq-jump a,
  .page-faq .faq-item summary {
    transition: none;
  }
}