/* ===== 知识中心 / page-faq ===== */
.page-faq {
  --kb-hair: rgba(138, 151, 166, .24);
  --kb-text-mute: rgba(244, 246, 247, .72);
  --kb-th-bg: rgba(244, 246, 247, .05);
  --kb-th-fg: #8A97A6;
  --kb-hover: rgba(255, 90, 31, .08);
  --kb-gap: clamp(24px, 4vw, 48px);
  background: var(--ink-900);
  color: var(--paper);
}

.page-faq .kb-sec--paper {
  --kb-hair: rgba(10, 15, 20, .14);
  --kb-text-mute: rgba(10, 15, 20, .68);
  --kb-th-bg: rgba(10, 15, 20, .045);
  --kb-th-fg: #2B3744;
  --kb-hover: rgba(255, 90, 31, .07);
}

.page-faq .kb-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink-900);
  color: var(--paper);
  padding: clamp(24px, 4vw, 44px) 0 clamp(30px, 5vw, 60px);
  border-bottom: 1px solid var(--kb-hair);
}

.page-faq .kb-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(138, 151, 166, .07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(138, 151, 166, .07) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(120% 92% at 12% 0%, #000 12%, transparent 76%);
  mask-image: radial-gradient(120% 92% at 12% 0%, #000 12%, transparent 76%);
}

.page-faq .kb-hero .wrap,
.page-faq .kb-hero__grid,
.page-faq .kb-toc {
  position: relative;
  z-index: 1;
}

.page-faq .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0 0 clamp(20px, 3vw, 32px);
  padding: 0;
  font-size: 12.5px;
}

.page-faq .breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--gray-500);
}

.page-faq .breadcrumbs__item a {
  color: var(--gray-500);
  text-decoration: none;
}

.page-faq .breadcrumbs__item a:hover {
  color: var(--cyan);
}

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

.page-faq .kb-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--kb-gap);
  align-items: end;
}

.page-faq .kb-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.3rem, 8.6vw, 5.2rem);
  line-height: .98;
  letter-spacing: -.02em;
  margin: 12px 0 clamp(16px, 2.4vw, 26px);
}

.page-faq .kb-hero__lead {
  margin: 0;
  max-width: 58ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.78;
  color: var(--kb-text-mute);
}

.page-faq .kb-hero__aside {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  padding-top: 16px;
  border-top: 1px solid var(--kb-hair);
}

.page-faq .note-v {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0;
}

.page-faq .kb-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-faq .kb-facts li {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-faq .kb-facts__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.6vw, 2.1rem);
  line-height: 1;
  color: var(--orange);
}

.page-faq .kb-facts__txt {
  font-size: 13px;
  color: var(--gray-500);
}

.page-faq .kb-toc {
  margin-top: clamp(28px, 4vw, 48px);
  padding-top: 14px;
  border-top: 1px solid var(--kb-hair);
}

.page-faq .kb-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 22px;
}

.page-faq .kb-toc__item a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 0;
  font-size: 14px;
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}

.page-faq .kb-toc__item a:hover,
.page-faq .kb-toc__item a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-faq .kb-toc__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--orange);
}

/* ---------- 章节 ---------- */
.page-faq .kb-sec {
  padding: clamp(44px, 6.5vw, 92px) 0;
}

.page-faq .kb-sec--ink {
  background: var(--ink-800);
  color: var(--paper);
  border-top: 1px solid var(--kb-hair);
  border-bottom: 1px solid var(--kb-hair);
}

.page-faq .kb-sec--ink + .kb-sec--ink {
  border-top: 0;
}

.page-faq .kb-sec--paper {
  background: var(--paper);
  color: var(--ink-900);
}

.page-faq .kb-sec--tight {
  padding-bottom: clamp(28px, 4vw, 48px);
}

.page-faq .kb-sec--contact {
  padding-top: clamp(34px, 5vw, 60px);
}

.page-faq .kb-sec__head {
  max-width: 66ch;
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-faq .kb-h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.65rem, 4.3vw, 2.85rem);
  line-height: 1.1;
  letter-spacing: -.012em;
  margin: 10px 0 14px;
}

.page-faq .kb-h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  line-height: 1.35;
  margin: 0 0 16px;
}

.page-faq .kb-sec__intro {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--kb-text-mute);
}

.page-faq .kb-note {
  margin: 18px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--kb-text-mute);
}

.page-faq .kb-note--after {
  margin-top: clamp(16px, 2.4vw, 24px);
}

.page-faq .kb-footnote {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--kb-text-mute);
}

.page-faq .kb-link {
  color: inherit;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  border-bottom: 0;
}

.page-faq .kb-link:hover,
.page-faq .kb-link:focus-visible {
  color: var(--orange);
}

/* ---------- 标签页与手风琴 ---------- */
.page-faq .kb-tabs {
  border-top: 1px solid var(--kb-hair);
  padding-top: 16px;
}

.page-faq .tabs__list {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: thin;
}

.page-faq .tabs__tab {
  flex: 0 0 auto;
  appearance: none;
  background: transparent;
  border: 1px solid var(--kb-hair);
  border-radius: var(--r);
  color: inherit;
  font: inherit;
  font-size: 14px;
  padding: 9px 18px;
  cursor: pointer;
  transition: background .18s ease, color .18s ease, border-color .18s ease;
}

.page-faq .tabs__tab:hover {
  border-color: var(--orange);
  color: var(--orange);
}

.page-faq .tabs__tab[aria-selected="true"] {
  background: var(--ink-900);
  border-color: var(--ink-900);
  color: var(--paper);
}

.page-faq .kb-sec--paper .tabs__tab[aria-selected="true"] {
  background: var(--ink-900);
  border-color: var(--ink-900);
  color: var(--paper);
}

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

.page-faq .tabs__panel + .tabs__panel {
  margin-top: 26px;
  padding-top: 26px;
  border-top: 1px dashed var(--kb-hair);
}

.page-faq .kb-q {
  border-bottom: 1px solid var(--kb-hair);
}

.page-faq .kb-q > summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  gap: 18px;
  align-items: flex-start;
  justify-content: space-between;
  padding: 18px 0;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.55;
}

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

.page-faq .kb-q > summary::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 19px;
  line-height: 1;
  color: var(--orange);
}

.page-faq .kb-q[open] > summary::after {
  content: "−";
}

.page-faq .kb-q > summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-faq .kb-q__body {
  padding: 0 0 20px;
}

.page-faq .kb-q__body p {
  margin: 0;
  max-width: 74ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--kb-text-mute);
}

/* ---------- 图片 ---------- */
.page-faq .kb-fig {
  margin: 0;
}

.page-faq .kb-fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--kb-hair);
  border-radius: var(--r);
  background: var(--ink-700);
}

.page-faq .kb-fig__cap {
  margin-top: 12px;
  padding-left: 12px;
  border-left: 2px solid var(--orange);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--kb-text-mute);
}

/* ---------- 质保区 ---------- */
.page-faq .kb-warranty {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--kb-gap);
}

.page-faq .kb-bars {
  list-style: none;
  margin: 0 0 4px;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-faq .kb-bar {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
}

.page-faq .kb-bar__label {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--ink-700);
}

.page-faq .kb-bar__track {
  position: relative;
  display: block;
  height: 10px;
  background: rgba(10, 15, 20, .09);
  overflow: hidden;
}

.page-faq .kb-bar__fill {
  display: block;
  height: 100%;
  width: 0;
  background: var(--orange);
}

.page-faq .kb-bar--y2 .kb-bar__fill { width: 34%; background: var(--ink-700); }
.page-faq .kb-bar--y3 .kb-bar__fill { width: 52%; background: var(--orange); }
.page-faq .kb-bar--y4 .kb-bar__fill { width: 74%; background: var(--orange); }
.page-faq .kb-bar--y5 .kb-bar__fill { width: 100%; background: var(--ink-900); }

.page-faq .kb-bar__val {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--kb-text-mute);
  white-space: nowrap;
}

/* ---------- 表格 ---------- */
.page-faq .kb-table-wrap {
  margin-top: clamp(28px, 4vw, 44px);
}

.page-faq .kb-table-wrap--flush {
  margin-top: 0;
}

.page-faq .kb-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-faq .kb-table th,
.page-faq .kb-table td {
  text-align: left;
  padding: 13px 14px;
  border-bottom: 1px solid var(--kb-hair);
  vertical-align: top;
}

.page-faq .kb-table thead th {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--kb-th-fg);
  background: var(--kb-th-bg);
  border-bottom: 1px solid var(--kb-hair);
  white-space: nowrap;
}

.page-faq .kb-table tbody tr:hover {
  background: var(--kb-hover);
}

.page-faq .kb-table td.mono {
  font-family: var(--font-mono);
  white-space: nowrap;
}

/* ---------- 保养区 ---------- */
.page-faq .kb-maint {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--kb-gap);
}

.page-faq .kb-tips {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: clamp(24px, 3.4vw, 36px);
}

.page-faq .kb-tip {
  padding: 18px 20px;
  border: 1px solid var(--kb-hair);
  border-radius: var(--r);
  background: rgba(138, 151, 166, .05);
}

.page-faq .kb-tip p {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--kb-text-mute);
}

/* ---------- 编号追溯 ---------- */
.page-faq .kb-seq {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-top: 1px solid var(--kb-hair);
}

.page-faq .kb-seq__item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 4px 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--kb-hair);
}

.page-faq .kb-seq__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--orange);
  letter-spacing: .06em;
}

.page-faq .kb-seq__name {
  font-weight: 700;
  font-size: 15.5px;
}

.page-faq .kb-seq__desc {
  grid-column: 2;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--kb-text-mute);
}

.page-faq .kb-trace-flow {
  margin-top: clamp(30px, 4.4vw, 52px);
  padding-top: clamp(22px, 3vw, 34px);
  border-top: 1px solid var(--kb-hair);
}

.page-faq .kb-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-faq .kb-flow__step {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.page-faq .kb-flow__n {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-900);
  background: var(--cyan);
  border-radius: var(--r);
}

.page-faq .kb-flow__step p {
  margin: 0;
  padding-top: 5px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--kb-text-mute);
}

/* ---------- 版本区 ---------- */
.page-faq .kb-version {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--kb-gap);
}

.page-faq .kb-version__meta {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-faq .kb-version__row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  align-items: baseline;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--kb-hair);
}

.page-faq .kb-version__key {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--yellow);
  min-width: 74px;
}

.page-faq .kb-version__val {
  font-size: 14px;
  line-height: 1.7;
  color: var(--kb-text-mute);
}

/* ---------- 联系区 ---------- */
.page-faq .kb-contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--kb-gap);
}

.page-faq .kb-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-faq .kb-contact__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--kb-hair);
}

.page-faq .kb-contact__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--kb-hair);
}

.page-faq .kb-contact__key {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--gray-500);
  min-width: 72px;
}

.page-faq .kb-contact__val {
  flex: 1 1 200px;
  font-size: 15px;
  line-height: 1.6;
  word-break: break-word;
}

.page-faq .kb-contact__row .copy-btn {
  appearance: none;
  background: transparent;
  border: 1px solid var(--kb-hair);
  border-radius: var(--r);
  color: var(--gray-500);
  font: inherit;
  font-size: 12px;
  padding: 5px 12px;
  cursor: pointer;
  transition: color .18s ease, border-color .18s ease;
}

.page-faq .kb-contact__row .copy-btn:hover,
.page-faq .kb-contact__row .copy-btn:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
}

.page-faq .kb-copy-state {
  min-height: 20px;
  margin: 10px 0 0;
  font-size: 12.5px;
  color: var(--cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-faq .kb-tips {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .kb-seq {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(20px, 3vw, 40px);
  }

  .page-faq .kb-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(20px, 3vw, 40px);
  }
}

@media (min-width: 960px) {
  .page-faq .kb-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(210px, 280px);
  }

  .page-faq .kb-hero__aside {
    flex-direction: row;
    align-items: flex-start;
    padding-top: 0;
    border-top: 0;
    border-left: 1px solid var(--kb-hair);
    padding-left: clamp(16px, 2.2vw, 28px);
  }

  .page-faq .kb-warranty {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .kb-maint {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    align-items: start;
  }

  .page-faq .kb-seq {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .kb-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 22px;
  }

  .page-faq .kb-flow__step {
    grid-template-columns: 34px minmax(0, 1fr);
    grid-auto-flow: row;
  }

  .page-faq .kb-version {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .kb-contact {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }
}

@media (min-width: 1280px) {
  .page-faq .kb-hero__lead {
    font-size: 17px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .kb-toc__item a,
  .page-faq .tabs__tab,
  .page-faq .kb-contact__row .copy-btn {
    transition: none;
  }
}