/* ===== 口径问答 · 页面专属样式（作用域 .page-faq） ===== */

.page-faq {
  --faq-answer: rgba(243, 236, 224, .80);
  --faq-hair: rgba(243, 236, 224, .14);
  --faq-dim: rgba(243, 236, 224, .42);
  --faq-band: clamp(40px, 6vw, 76px);
}

/* --- 首屏 --- */
.page-faq .faq-hero {
  padding-block: clamp(26px, 4vw, 48px) clamp(34px, 5vw, 64px);
  border-bottom: 1px solid var(--faq-hair);
}

.page-faq .faq-hero-grid {
  display: block;
}

.page-faq .faq-hero-lead,
.page-faq .faq-hero-side,
.page-faq .faq-main {
  min-width: 0;
}

.page-faq .breadcrumb {
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-faq .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: .02em;
  color: var(--text-dim);
}

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

.page-faq .breadcrumb a:hover,
.page-faq .breadcrumb a:focus-visible {
  color: var(--cyan-400);
  border-bottom-color: var(--cyan-700);
}

.page-faq .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(243, 236, 224, .30);
}

.page-faq .faq-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text-dim);
}

.page-faq .faq-kicker::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--ember-500);
}

.page-faq .faq-title {
  margin: 16px 0 0;
  max-width: 22ch;
  font-size: clamp(32px, 6vw, 62px);
  font-weight: 300;
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--cream-50);
}

.page-faq .faq-lede {
  margin: 22px 0 0;
  max-width: 64ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--faq-answer);
}

.page-faq .faq-hero-side .faq-lede {
  margin-top: 0;
}

.page-faq .faq-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 20px;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: clamp(18px, 3vw, 26px) 0 0;
  border-top: 1px solid var(--faq-hair);
  list-style: none;
}

.page-faq .faq-stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-faq .faq-stats .num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.4vw, 42px);
  line-height: 1;
  letter-spacing: .04em;
  font-variant-numeric: tabular-nums;
  color: var(--cream-50);
}

.page-faq .faq-stat-label {
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: .16em;
  color: var(--text-dim);
}

/* --- 正文布局 --- */
.page-faq .faq-body {
  padding-block: var(--faq-band) clamp(64px, 9vw, 120px);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
  align-items: start;
}

/* --- 左栏索引 --- */
.page-faq .faq-rail {
  display: grid;
  gap: 18px;
  min-width: 0;
}

.page-faq .faq-rail > .label {
  color: var(--text-dim);
}

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

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

.page-faq .faq-index-link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 13px 2px;
  font-size: 15px;
  line-height: 1.5;
  color: var(--cream-50);
  text-decoration: none;
  transition: color 180ms var(--ease), padding-left 180ms var(--ease);
}

.page-faq .faq-index-link:hover,
.page-faq .faq-index-link:focus-visible {
  color: var(--cyan-400);
  padding-left: 8px;
}

.page-faq .faq-index-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--faq-dim);
  transition: color 180ms var(--ease);
}

.page-faq .faq-index-link:hover .faq-index-num,
.page-faq .faq-index-link:focus-visible .faq-index-num {
  color: var(--cyan-400);
}

.page-faq .faq-figure {
  margin: 0;
}

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

.page-faq .faq-figure--wide {
  margin: 0 0 clamp(24px, 3vw, 36px);
}

.page-faq .media-caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: .02em;
  color: var(--text-dim);
}

/* --- 问答分组 --- */
.page-faq .faq-group {
  scroll-margin-top: 88px;
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(44px, 6vw, 76px);
}

.page-faq .faq-group + .faq-group::before {
  content: "";
  display: block;
  width: 64px;
  height: 3px;
  margin-bottom: clamp(24px, 3vw, 36px);
  background: var(--ember-500);
}

.page-faq .faq-group-head {
  display: grid;
  gap: 10px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--faq-hair);
}

.page-faq .faq-group-num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--faq-dim);
  transition: color 240ms var(--ease);
}

.page-faq .faq-group:target .faq-group-num {
  color: var(--cyan-400);
}

.page-faq .faq-group-title {
  margin: 0;
  font-size: clamp(23px, 3.2vw, 36px);
  font-weight: 400;
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--cream-50);
}

.page-faq .faq-group-note {
  margin: 0;
  max-width: 62ch;
  font-size: 13px;
  line-height: 1.65;
  letter-spacing: .02em;
  color: var(--text-dim);
}

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

.page-faq .faq-q {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 14px;
  align-items: baseline;
  padding: 18px 2px;
  cursor: pointer;
  list-style: none;
  transition: padding-left 180ms var(--ease);
}

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

.page-faq .faq-q::marker {
  content: "";
}

.page-faq .faq-q::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.6;
  letter-spacing: .06em;
  color: var(--cyan-400);
}

.page-faq .faq-item[open] .faq-q::before {
  content: "−";
}

.page-faq .faq-q-text {
  font-size: 16px;
  font-weight: 500;
  line-height: 1.6;
  color: var(--cream-50);
  transition: color 180ms var(--ease);
}

.page-faq .faq-q:hover .faq-q-text,
.page-faq .faq-q:focus-visible .faq-q-text {
  color: var(--cyan-400);
}

.page-faq .faq-q:focus-visible {
  outline: 1px solid var(--cyan-700);
  outline-offset: 2px;
}

.page-faq .faq-q .tag {
  align-self: center;
  padding: 3px 9px;
  border: 1px solid var(--line-dark-strong);
  border-radius: var(--r-sm);
  font-size: 11px;
  line-height: 1.4;
  letter-spacing: .16em;
  color: var(--text-dim);
  white-space: nowrap;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-faq .faq-item[open] .faq-q .tag {
  border-color: var(--cyan-700);
  color: var(--cyan-400);
}

.page-faq .faq-item[open] .faq-q .tag-amber {
  border-color: var(--amber-600);
  color: var(--amber-400);
}

.page-faq .faq-a {
  padding: 0 2px 22px;
}

.page-faq .faq-a p {
  margin: 0 0 12px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--faq-answer);
}

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

.page-faq .faq-a .num {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: .06em;
  font-variant-numeric: tabular-nums;
  color: var(--cream-50);
}

.page-faq .faq-a .faq-note {
  margin: 16px 0 0;
  padding-top: 10px;
  border-top: 1px dashed rgba(243, 236, 224, .18);
  font-size: 13px;
  line-height: 1.65;
  letter-spacing: .02em;
  color: var(--text-dim);
  transition: border-color 180ms var(--ease);
}

.page-faq .faq-item:hover .faq-a .faq-note {
  border-top-color: rgba(53, 224, 210, .34);
}

/* --- 页内文字链接 --- */
.page-faq .link-plain {
  color: var(--cream-50);
  text-decoration: none;
  border-bottom: 1px solid var(--amber-600);
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-faq .link-plain:hover,
.page-faq .link-plain:focus-visible {
  color: var(--amber-400);
  border-bottom-color: var(--amber-400);
}

/* --- 尾部：未收录问题 --- */
.page-faq .faq-tail {
  padding-block: clamp(48px, 7vw, 84px) clamp(72px, 11vw, 150px);
}

.page-faq .faq-tail-inner {
  display: block;
}

.page-faq .faq-tail .faq-group-head {
  border-bottom-color: var(--line-dark-strong);
}

.page-faq .faq-tail-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(26px, 4vw, 40px);
}

.page-faq .faq-tail-body p {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--faq-answer);
}

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

.page-faq .faq-tail-body .num {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: .06em;
  font-variant-numeric: tabular-nums;
  color: var(--cyan-400);
}

.page-faq .faq-contact {
  padding: clamp(20px, 3vw, 28px);
  background: rgba(8, 19, 31, .55);
  border: 1px solid var(--line-dark-strong);
  border-radius: var(--r-md);
}

.page-faq .faq-contact > .label {
  display: block;
  margin-bottom: 16px;
  color: var(--text-dim);
}

.page-faq .faq-contact-list {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px 16px;
  margin: 0;
}

.page-faq .faq-contact-list dt {
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: .02em;
  color: var(--text-dim);
}

.page-faq .faq-contact-list dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  letter-spacing: .02em;
  color: var(--cream-50);
  word-break: break-word;
}

/* --- 窄屏微调 --- */
@media (max-width: 479px) {
  .page-faq .faq-q {
    grid-template-columns: auto minmax(0, 1fr);
    row-gap: 8px;
  }

  .page-faq .faq-q .tag {
    grid-column: 2;
    justify-self: start;
  }

  .page-faq .faq-contact-list {
    grid-template-columns: 1fr;
    gap: 4px 0;
  }

  .page-faq .faq-contact-list dd {
    margin-bottom: 10px;
  }
}

/* --- 宽屏 --- */
@media (min-width: 900px) {
  .page-faq .faq-hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    gap: clamp(36px, 5vw, 84px);
    align-items: start;
  }

  .page-faq .faq-hero-side {
    padding-top: clamp(42px, 5vw, 68px);
  }

  .page-faq .faq-layout {
    grid-template-columns: minmax(200px, 246px) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 76px);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 84px;
    align-self: start;
  }

  .page-faq .faq-a {
    padding-left: 29px;
  }

  .page-faq .faq-tail-grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-title {
    max-width: 17ch;
  }

  .page-faq .faq-stats {
    gap: 28px;
  }
}

/* --- 降低动效 --- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index-link,
  .page-faq .faq-index-num,
  .page-faq .faq-q,
  .page-faq .faq-q-text,
  .page-faq .faq-q .tag,
  .page-faq .breadcrumb a,
  .page-faq .link-plain,
  .page-faq .faq-group-num,
  .page-faq .faq-a .faq-note {
    transition: none;
  }
}