.page-products {
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
}

/* ---------- 页头 ---------- */
.page-products .page-head {
  padding: clamp(24px, 4.4vw, 52px) 0 clamp(18px, 2.6vw, 30px);
  background-image: linear-gradient(180deg, var(--mist) 0%, rgba(233, 236, 238, 0) 100%);
  border-bottom: 1px solid var(--line-soft);
}

.page-products .page-head h1 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 4.4vw, 52px);
  line-height: 1.16;
  letter-spacing: 0.005em;
  max-width: 17em;
}

.page-products .fn-lede {
  margin: 18px 0 0;
  max-width: 44em;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.78;
}

.page-products .fn-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-products .fn-facts li {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 6px 14px;
  border: 1px solid var(--line-ink);
  border-radius: 999px;
  background: var(--paper);
  font-size: 13.5px;
  line-height: 1.4;
}

.page-products .fn-facts .mono {
  font-size: 15px;
  font-weight: 700;
  color: var(--apricot-deep);
}

/* ---------- 章节索引条 ---------- */
.page-products .fn-index {
  position: sticky;
  top: var(--bar-h);
  z-index: 6;
  background: rgba(251, 249, 246, 0.95);
  border-bottom: 1px solid var(--line-ink);
  backdrop-filter: blur(8px);
}

.page-products .fn-index-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 10px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-products .fn-index-list::-webkit-scrollbar {
  display: none;
}

.page-products .fn-index-list a {
  display: inline-block;
  white-space: nowrap;
  padding: 7px 13px;
  border: 1px solid var(--line-ink);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--lake-deep);
  text-decoration: none;
  transition: background-color 160ms var(--ease), color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-products .fn-index-list a:hover,
.page-products .fn-index-list a:focus-visible {
  border-color: var(--apricot);
  color: var(--apricot-deep);
  background: rgba(240, 138, 60, 0.1);
}

.page-products .fn-index-list a.is-current {
  background: var(--apricot);
  border-color: var(--apricot-deep);
  color: #ffffff;
}

/* ---------- 章节骨架 ---------- */
.page-products .fn-block {
  padding: clamp(30px, 4.6vw, 62px) 0;
  scroll-margin-top: calc(var(--bar-h) + 62px);
}

.page-products .fn-claim {
  margin: 16px 0 clamp(18px, 2.6vw, 30px);
  padding-left: 16px;
  border-left: 3px solid var(--apricot);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.05vw, 24px);
  line-height: 1.55;
  color: var(--ink);
  max-width: 32em;
}

/* ---------- 对照卡 ---------- */
.page-products .fn-pair {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  background: var(--paper);
  border: 1px solid var(--line-ink);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.page-products .fn-side {
  min-width: 0;
  padding: clamp(18px, 2.4vw, 28px);
}

.page-products .fn-side p {
  margin: 0 0 12px;
  font-size: 16px;
  line-height: 1.78;
  max-width: 42em;
}

.page-products .fn-side p:last-child {
  margin-bottom: 0;
}

.page-products .fn-side--view {
  display: flex;
  flex-direction: column;
  gap: 16px;
  background: var(--mist);
  border-top: 1px dashed rgba(18, 58, 76, 0.35);
}

.page-products .fn-side--view figure,
.page-products .fn-figure {
  margin: 0;
}

.page-products .fn-pair img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line-soft);
  background: var(--paper);
}

/* ---------- 目录树 ---------- */
.page-products .fn-tree {
  display: grid;
  gap: 8px;
  margin-top: 18px;
}

.page-products .fn-branch {
  border: 1px solid var(--line-ink);
  border-radius: var(--radius);
  background: var(--paper);
}

.page-products .fn-branch > summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  cursor: pointer;
  list-style: none;
  border-left: 4px solid var(--apricot);
  background: linear-gradient(90deg, rgba(240, 138, 60, 0.16), rgba(240, 138, 60, 0.02));
  font-size: 15px;
}

.page-products .fn-branch > summary::-webkit-details-marker {
  display: none;
}

.page-products .fn-branch > summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--apricot-deep);
}

.page-products .fn-branch[open] > summary::after {
  content: "−";
}

.page-products .fn-branch-name {
  font-weight: 700;
  color: var(--ink);
}

.page-products .fn-branch-meta {
  margin-left: auto;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--apricot-deep);
}

.page-products .fn-leaves {
  display: grid;
  gap: 6px;
  margin: 0;
  padding: 10px 14px 13px;
  list-style: none;
}

.page-products .fn-leaves li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink);
}

.page-products .fn-leaves li .mono {
  margin-left: auto;
  font-size: 12px;
  color: var(--rock);
}

.page-products .fn-leaf-dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--lake);
}

/* ---------- 用法提示 ---------- */
.page-products .fn-tip {
  margin: 16px 0 0;
  padding-left: 14px;
  border-left: 1px solid var(--line-ink);
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--rock);
}

.page-products .fn-tip .mono {
  display: inline-block;
  margin-right: 8px;
  padding: 2px 8px;
  background: var(--amber);
  color: var(--lake-deep);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  transform: rotate(-1.5deg);
}

/* ---------- 版本对照台 ---------- */
.page-products .fn-tabs {
  display: block;
}

.page-products .fn-tab-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
}

.page-products .tab-panel {
  display: block;
}

.page-products .tab-panel[hidden] {
  display: none !important;
}

.page-products .fn-contrast {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  border: 1px solid var(--line-ink);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--paper);
}

.page-products .fn-contrast .contrast-side {
  min-width: 0;
  padding: 15px 14px;
}

.page-products .fn-contrast .contrast-side--left {
  background: rgba(75, 63, 110, 0.14);
}

.page-products .fn-contrast .contrast-side--right {
  background: rgba(138, 59, 59, 0.14);
  border-left: 1px dashed rgba(18, 58, 76, 0.35);
}

.page-products .fn-ver {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--lake-deep);
}

.page-products .fn-seg {
  margin: 0 0 8px;
  padding: 6px 8px;
  border-radius: 1px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--ink);
}

.page-products .fn-seg:last-child {
  margin-bottom: 0;
}

.page-products .fn-seg--diff {
  background: rgba(232, 169, 58, 0.32);
  box-shadow: inset 2px 0 0 var(--amber);
}

.page-products .fn-stacklist p {
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ink);
}

.page-products .fn-stacklist p:last-child {
  margin-bottom: 0;
}

.page-products .fn-stacklist-note {
  color: var(--rock);
  font-size: 13.5px;
}

.page-products .fn-stacklist .mono {
  color: var(--lake-deep);
  font-size: 12.5px;
  margin-right: 6px;
}

/* ---------- 收藏与提醒 ---------- */
.page-products .fn-bookmarks {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-products .fn-bookmark {
  display: inline-block;
  padding: 7px 12px;
  border: 1px solid var(--line-ink);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--rock);
  font-size: 13px;
  line-height: 1.4;
  transform: rotate(-1deg);
}

.page-products .fn-bookmark--on {
  background: var(--amber);
  border-color: var(--apricot-deep);
  color: var(--lake-deep);
  font-weight: 700;
  transform: rotate(-2deg);
}

.page-products .fn-subscribe {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-products .fn-subscribe li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--paper);
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink);
}

.page-products .fn-check {
  position: relative;
  flex: none;
  width: 16px;
  height: 16px;
  border: 1px solid var(--rock);
  border-radius: 2px;
  background: var(--paper);
}

.page-products .fn-check--on {
  background: var(--apricot);
  border-color: var(--apricot-deep);
}

.page-products .fn-check--on::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 1px;
  width: 4px;
  height: 9px;
  border-right: 2px solid #ffffff;
  border-bottom: 2px solid #ffffff;
  transform: rotate(40deg);
}

/* ---------- 路径与加载 ---------- */
.page-products .fn-meters {
  display: grid;
  gap: 14px;
  margin-top: 20px;
}

.page-products .fn-meter {
  display: grid;
  gap: 6px;
}

.page-products .fn-meter-label {
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--rock);
}

.page-products .fn-meter-track {
  display: block;
  height: 12px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  background: var(--mist);
  overflow: hidden;
}

.page-products .fn-meter-fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  transform-origin: left center;
  animation: fn-grow 720ms var(--ease) both;
}

.page-products .fn-meter-fill--a {
  width: 100%;
  background: var(--apricot);
}

.page-products .fn-meter-fill--b {
  width: 55%;
  background: var(--lake);
}

.page-products .fn-meter-value {
  font-size: 13px;
  font-weight: 700;
  color: var(--lake-deep);
}

@keyframes fn-grow {
  from {
    transform: scaleX(0);
  }
  to {
    transform: scaleX(1);
  }
}

/* ---------- 适用场景 ---------- */
.page-products .fn-fit {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-ink);
}

.page-products .fn-fit > li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line-ink);
}

.page-products .fn-fit-key {
  align-self: start;
  padding-left: 10px;
  border-left: 3px solid var(--apricot);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--apricot-deep);
}

.page-products .fn-fit h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2vw, 21px);
  line-height: 1.42;
  color: var(--ink);
}

.page-products .fn-fit p {
  margin: 0 0 10px;
  font-size: 15.5px;
  line-height: 1.78;
  max-width: 54em;
}

.page-products .fn-fit p:last-child {
  margin-bottom: 0;
}

.page-products .fn-fit-link a {
  font-size: 14px;
  color: var(--lake);
  text-decoration: none;
  border-bottom: 1px solid var(--lake);
  padding-bottom: 1px;
}

.page-products .fn-fit-link a:hover,
.page-products .fn-fit-link a:focus-visible {
  color: var(--apricot-deep);
  border-color: var(--apricot-deep);
}

/* ---------- 收尾 ---------- */
.page-products .fn-next {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  margin-top: 34px;
  padding: 20px 22px;
  border-radius: var(--radius);
  background: var(--lake-deep);
  color: var(--paper);
  font-size: 15px;
  line-height: 1.7;
}

.page-products .fn-next p {
  margin: 0;
  max-width: 46em;
}

.page-products .fn-next a {
  color: var(--amber);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid var(--amber);
}

.page-products .fn-next a:hover,
.page-products .fn-next a:focus-visible {
  color: #ffffff;
  border-color: #ffffff;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-products .fn-fit > li {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 26px;
  }

  .page-products .fn-meter {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 8px 16px;
  }

  .page-products .fn-meter-label {
    grid-column: 1 / 2;
  }

  .page-products .fn-meter-track {
    grid-column: 1 / 2;
  }

  .page-products .fn-meter-value {
    grid-column: 2 / 3;
    grid-row: 1 / 3;
    white-space: nowrap;
  }
}

@media (min-width: 900px) {
  .page-products .fn-pair {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .page-products .fn-side--view {
    border-top: 0;
    border-left: 1px dashed rgba(18, 58, 76, 0.35);
  }
}

@media (max-width: 480px) {
  .page-products .fn-contrast {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-products .fn-contrast .contrast-side--right {
    border-left: 0;
    border-top: 1px dashed rgba(18, 58, 76, 0.35);
  }

  .page-products .fn-facts li {
    font-size: 12.5px;
    padding: 5px 11px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-products .fn-meter-fill {
    animation: none;
  }
}