/* ===== 知识中心 / page-faq ===== */

.page-faq {
  --kb-line: rgba(154, 167, 156, 0.16);
  --kb-soft: rgba(7, 19, 16, 0.62);
}

/* --- 开场 --- */
.page-faq .kb-hero {
  padding-block: clamp(30px, 5.5vw, 76px);
  border-bottom: 1px solid var(--line-gold);
  background:
    radial-gradient(120% 90% at 8% 0%, rgba(53, 242, 192, 0.07), transparent 60%),
    linear-gradient(180deg, var(--pitch-deep) 0%, var(--void-black) 100%);
}

.page-faq .kb-hero__inner {
  display: grid;
  gap: clamp(24px, 4vw, 52px);
}

@media (min-width: 900px) {
  .page-faq .kb-hero__inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: center;
  }
}

.page-faq .breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-faq .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms ease, border-color 180ms ease;
}

.page-faq .breadcrumb a:hover {
  color: var(--signal-cyan);
  border-bottom-color: var(--line-cyan);
}

.page-faq .kb-hero .kicker {
  margin-top: 18px;
}

.page-faq .kb-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.35rem, 7vw, 5.2rem);
  line-height: 0.94;
  letter-spacing: -0.02em;
  color: var(--chalk);
}

.page-faq .kb-hero__lede {
  margin: 20px 0 0;
  max-width: 56ch;
  font-family: var(--font-body);
  font-size: clamp(1rem, 1.5vw, 1.1rem);
  line-height: 1.78;
  color: var(--text-body);
}

.page-faq .kb-quick {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  padding: 11px 14px;
  border: 1px solid var(--line-gold);
  border-radius: var(--pill);
  background: linear-gradient(90deg, rgba(53, 242, 192, 0.07), rgba(7, 19, 16, 0.72));
}

.page-faq .kb-quick__label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--mist);
  padding-inline: 6px 4px;
}

.page-faq .kb-quick__link {
  text-decoration: none;
  transition: transform 180ms var(--ease-out), border-color 180ms ease;
}

.page-faq .kb-quick__link:hover {
  transform: translateY(-2px);
}

.page-faq .kb-hero__figure {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  position: relative;
}

.page-faq .kb-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.05);
}

/* --- 布局 --- */
.page-faq .kb-layout {
  display: grid;
  gap: clamp(26px, 4vw, 56px);
  padding-block: clamp(34px, 5vw, 74px);
}

@media (min-width: 1024px) {
  .page-faq .kb-layout {
    grid-template-columns: 214px minmax(0, 1fr);
  }
}

/* --- 目录 --- */
.page-faq .kb-toc__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.page-faq .kb-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  padding-bottom: 4px;
}

.page-faq .kb-toc__list::-webkit-scrollbar {
  display: none;
}

.page-faq .kb-toc__list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex: none;
  padding: 7px 15px;
  border: 1px solid var(--kb-line);
  border-radius: var(--pill);
  color: var(--mist);
  text-decoration: none;
  font-size: 0.88rem;
  white-space: nowrap;
  transition: color 180ms ease, border-color 180ms ease, background 180ms ease;
}

.page-faq .kb-toc__num {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  color: var(--gold-trace);
  display: none;
}

.page-faq .kb-toc__list a:hover {
  color: var(--chalk);
  border-color: var(--line-cyan);
}

.page-faq .kb-toc__list a.is-active {
  color: var(--void-black);
  background: var(--signal-cyan);
  border-color: var(--signal-cyan);
  font-weight: 700;
}

@media (min-width: 1024px) {
  .page-faq .kb-toc {
    position: sticky;
    top: 118px;
  }

  .page-faq .kb-toc__list {
    flex-direction: column;
    overflow: visible;
    gap: 2px;
    padding-bottom: 0;
  }

  .page-faq .kb-toc__list a {
    border: 0;
    border-radius: 0;
    border-left: 1px solid var(--kb-line);
    padding: 9px 12px;
  }

  .page-faq .kb-toc__list a.is-active {
    color: var(--chalk);
    background: linear-gradient(90deg, rgba(53, 242, 192, 0.12), transparent);
    border-left-color: var(--signal-cyan);
    font-weight: 600;
  }

  .page-faq .kb-toc__num {
    display: inline;
  }
}

/* --- 章节 --- */
.page-faq .kb-section {
  scroll-margin-top: 120px;
  padding-block: clamp(28px, 4vw, 52px);
}

.page-faq .kb-section:first-child {
  padding-top: 0;
}

.page-faq .kb-section + .kb-section {
  border-top: 1px solid var(--kb-line);
}

.page-faq .kb-section .section-lede {
  max-width: 68ch;
}

.page-faq .kb-section .section-title {
  margin-top: 8px;
}

/* --- 分组标签 --- */
.page-faq .kb-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
  border-bottom: 1px solid var(--kb-line);
  padding-bottom: 16px;
}

.page-faq .kb-tabs .tab {
  appearance: none;
  border: 1px solid var(--kb-line);
  background: transparent;
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 0.9rem;
  padding: 8px 18px;
  border-radius: var(--pill);
  cursor: pointer;
  transition: color 180ms ease, border-color 180ms ease, background 180ms ease;
}

.page-faq .kb-tabs .tab:hover {
  color: var(--chalk);
  border-color: var(--line-cyan);
}

.page-faq .kb-tabs .tab.is-active,
.page-faq .kb-tabs .tab[aria-selected="true"] {
  background: var(--signal-cyan);
  border-color: var(--signal-cyan);
  color: var(--void-black);
  font-weight: 700;
}

/* --- 问答 --- */
.page-faq .kb-panel {
  padding-top: 6px;
}

.page-faq .kb-panel + .kb-panel {
  margin-top: 12px;
}

.page-faq .qa {
  border-bottom: 1px solid var(--kb-line);
  transition: background 240ms ease;
}

.page-faq .qa__q {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px 6px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-serif);
  font-size: clamp(1rem, 1.5vw, 1.14rem);
  line-height: 1.55;
  color: var(--chalk);
  transition: color 180ms ease;
}

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

.page-faq .qa__q:hover {
  color: var(--signal-cyan);
}

.page-faq .qa__icon {
  flex: none;
  display: inline-flex;
  margin-top: 5px;
}

.page-faq .qa__bar {
  stroke: var(--mist);
  stroke-width: 2;
  stroke-linecap: round;
  transition: stroke 240ms var(--ease-out), transform 240ms var(--ease-out);
}

.page-faq .qa__bar--v {
  transform-box: view-box;
  transform-origin: 9px 9px;
}

.page-faq .qa[open] .qa__bar {
  stroke: var(--signal-cyan);
}

.page-faq .qa[open] .qa__bar--v {
  transform: scaleY(0);
}

.page-faq .qa__a {
  padding: 0 6px 20px 38px;
}

.page-faq .qa__a p {
  margin: 0 0 12px;
  max-width: 68ch;
  font-size: 0.97rem;
  line-height: 1.78;
  color: var(--text-body);
}

.page-faq .qa__a .qa__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 8px 0 0;
}

/* --- 口径编号按钮 --- */
.page-faq .kb-cal {
  cursor: pointer;
}

.page-faq .kb-code {
  border-left: 2px solid var(--gold-trace);
}

/* --- 对照图 --- */
.page-faq .kb-figure {
  margin: 24px 0 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--kb-line);
}

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

/* --- 表格 --- */
.page-faq .kb-table {
  margin-top: 22px;
  border-radius: var(--radius-sharp);
}

.page-faq .kb-caption {
  caption-side: top;
  text-align: left;
  padding-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* --- 读表指引 --- */
.page-faq .kb-reading {
  margin-top: 24px;
}

.page-faq .kb-read {
  padding: 22px 20px;
  border: 1px solid var(--kb-line);
  border-radius: var(--radius-sharp);
  background: linear-gradient(160deg, rgba(28, 58, 43, 0.5), rgba(7, 19, 16, 0.72));
}

.page-faq .kb-read h3 {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-size: 1.2rem;
  line-height: 1.4;
  color: var(--chalk);
}

.page-faq .kb-read ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .kb-read li {
  position: relative;
  padding-left: 18px;
  font-size: 0.94rem;
  line-height: 1.72;
  color: var(--text-body);
}

.page-faq .kb-read li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 9px;
  height: 2px;
  background: var(--signal-cyan);
}

/* --- 键盘操作 --- */
.page-faq .kb-keys {
  margin-top: 20px;
  padding: 22px 20px;
  border: 1px solid var(--line-gold);
  border-radius: var(--radius-sharp);
  background: var(--kb-soft);
}

.page-faq .kb-keys__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--gold-trace);
}

.page-faq .kb-keys__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-faq .kb-keys__list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  font-size: 0.92rem;
  color: var(--text-body);
}

.page-faq .kb-keys__list kbd {
  flex: none;
  min-width: 62px;
  text-align: center;
  padding: 3px 10px;
  border-radius: var(--pill);
  border: 1px solid var(--line-cyan);
  background: rgba(53, 242, 192, 0.08);
  color: var(--signal-cyan);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
}

/* --- 术语表 --- */
.page-faq .kb-terms {
  margin: 24px 0 0;
  padding: 0;
}

.page-faq .kb-term {
  display: grid;
  gap: 8px;
  padding: 16px 0;
  border-bottom: 1px solid var(--kb-line);
}

.page-faq .kb-term dt {
  width: fit-content;
  padding: 4px 14px;
  border-radius: var(--pill);
  border: 1px solid var(--line-cyan);
  background: rgba(53, 242, 192, 0.08);
  color: var(--signal-cyan);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.03em;
}

.page-faq .kb-term dd {
  margin: 0;
  max-width: 64ch;
  font-size: 0.94rem;
  line-height: 1.76;
  color: var(--text-body);
}

@media (min-width: 760px) {
  .page-faq .kb-term {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 26px;
    align-items: baseline;
  }
}

/* --- 边界 --- */
.page-faq .kb-bound {
  margin-top: 24px;
}

.page-faq .kb-bound-card {
  padding: 24px 20px;
  border-radius: var(--radius-sharp);
  border: 1px solid var(--kb-line);
  background: linear-gradient(170deg, rgba(16, 36, 26, 0.6), rgba(7, 19, 16, 0.72));
}

.page-faq .kb-bound-card--ask {
  border-color: var(--line-gold);
  background: linear-gradient(170deg, rgba(28, 58, 43, 0.5), rgba(7, 19, 16, 0.78));
}

.page-faq .kb-bound-card h3 {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-size: 1.2rem;
  line-height: 1.4;
  color: var(--chalk);
}

.page-faq .kb-bound-card ul {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .kb-bound-card li {
  position: relative;
  padding-left: 18px;
  font-size: 0.94rem;
  line-height: 1.72;
  color: var(--text-body);
}

.page-faq .kb-bound-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 9px;
  height: 2px;
  background: var(--gold-trace);
}

.page-faq .kb-bound-card--self li::before {
  background: var(--signal-cyan);
}

.page-faq .kb-bound__contact {
  margin: 0 0 18px;
  padding: 12px 14px;
  border-left: 2px solid var(--gold-trace);
  background: rgba(7, 19, 16, 0.7);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--mist);
  word-break: break-word;
}

.page-faq .kb-bound__note {
  margin: 22px 0 0;
  max-width: 72ch;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--mist);
}

.page-faq .kb-bound__note a {
  color: var(--signal-cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
  transition: border-color 180ms ease;
}

.page-faq .kb-bound__note a:hover {
  border-bottom-color: var(--signal-cyan);
}

/* --- 窄屏收尾 --- */
@media (max-width: 640px) {
  .page-faq .kb-hero h1 {
    font-size: clamp(2.1rem, 10vw, 2.9rem);
  }

  .page-faq .kb-quick {
    border-radius: var(--radius-md);
  }

  .page-faq .qa__a {
    padding-left: 6px;
  }

  .page-faq .kb-keys__list li {
    display: grid;
    gap: 6px;
  }

  .page-faq .kb-keys__list kbd {
    justify-self: start;
  }
}