.page-products {
  --prod-rail: 116px;
  --prod-line: rgba(90, 107, 122, 0.24);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-products .breadcrumb { padding: 20px 0 0; font-size: var(--fs-12); }
.page-products .breadcrumb ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--slate);
}
.page-products .breadcrumb a {
  color: var(--slate);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.page-products .breadcrumb a:hover,
.page-products .breadcrumb a:focus-visible { border-bottom-color: var(--gold); }
.page-products .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--slate);
  opacity: 0.55;
}
.page-products .breadcrumb [aria-current="page"] { color: var(--ink); }

/* ---------- 首屏 ---------- */
.page-products .prod-hero { padding: 20px 0 34px; }
.page-products .eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--slate);
  text-transform: uppercase;
  margin: 0 0 10px;
}
.page-products h1 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(30px, 6.4vw, 56px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
  max-width: 18em;
}
.page-products .lede {
  max-width: var(--measure);
  font-size: var(--fs-17);
  line-height: 1.95;
  color: #33414d;
  margin: 0 0 26px;
}
.page-products .hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin: 0;
  padding: 16px 0 0;
  list-style: none;
  border-top: 1px solid var(--prod-line);
}
.page-products .hero-facts li { display: flex; align-items: baseline; gap: 8px; }
.page-products .hero-facts .mono-num {
  font-family: var(--font-mono);
  font-size: var(--fs-21);
  color: var(--deep);
}
.page-products .fact-label { font-size: var(--fs-14); color: var(--slate); }

.page-products .prod-heroband {
  margin: 0;
  border-radius: 0;
  overflow: hidden;
  background: linear-gradient(120deg, var(--deep) 0%, var(--deep-2) 55%, var(--mist) 100%);
}
.page-products .prod-heroband img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 布局：左索引带 + 右内容 ---------- */
.page-products .prod-layout { padding: 30px 0 64px; }

.page-products .index-rail {
  margin-bottom: 18px;
  border-bottom: 1px solid var(--prod-line);
  padding-bottom: 14px;
}
.page-products .rail-title {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--slate);
  margin: 0 0 10px;
}
.page-products .index-rail nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  -webkit-overflow-scrolling: touch;
}
.page-products .index-rail a {
  flex: 0 0 auto;
  padding: 7px 14px;
  border-radius: var(--pill);
  border: 1px solid var(--prod-line);
  background: var(--warm);
  color: var(--slate);
  font-size: var(--fs-14);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.page-products .index-rail a:hover,
.page-products .index-rail a:focus-visible { color: var(--deep); border-color: var(--gold); }
.page-products .index-rail a[aria-current="true"] {
  color: var(--deep);
  border-color: var(--gold);
  box-shadow: inset 0 -2px 0 var(--gold);
}

/* ---------- 章节 ---------- */
.page-products .sec {
  padding: 38px 0 30px;
  border-top: 1px solid var(--prod-line);
}
.page-products .sec:first-of-type { border-top: 0; padding-top: 8px; }
.page-products .section-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.28;
  letter-spacing: -0.015em;
  margin: 0 0 18px;
}
.page-products .prose {
  max-width: var(--measure);
  font-size: var(--fs-17);
  line-height: 1.9;
  color: var(--ink);
  margin: 0;
}
.page-products .prose p { margin: 0 0 16px; }
.page-products .prose p:last-child { margin-bottom: 0; }
.page-products .prose .mono-num,
.page-products .ver-plain .mono-num,
.page-products .step-num {
  font-family: var(--font-mono);
  font-size: 0.92em;
  color: var(--deep);
}

.page-products .sec-cols { display: grid; gap: 20px; margin-bottom: 26px; }
.page-products .side-figure {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: linear-gradient(160deg, var(--deep-2), var(--mist));
}
.page-products .side-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}
.page-products .frame-cap {
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--slate);
  padding: 10px 14px 12px;
  background: rgba(255, 251, 243, 0.92);
  margin: 0;
}

/* ---------- 色带卡片 ---------- */
.page-products .band-row { display: grid; gap: 12px; }
.page-products .band-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 16px 18px;
  border-radius: var(--radius-md);
  background: var(--warm);
  border: 1px solid var(--prod-line);
}
.page-products .band-line {
  display: block;
  align-self: stretch;
  border-radius: var(--pill);
  width: 6px;
}
.page-products .band-card--entry .band-line { background: var(--deep); width: 6px; }
.page-products .band-card--section .band-line { background: var(--gold); width: 4px; }
.page-products .band-card--version .band-line { background: var(--mist); width: 3px; }
.page-products .band-card h3 {
  font-family: var(--font-head);
  font-size: var(--fs-21);
  margin: 0 0 6px;
}
.page-products .band-card p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--slate);
}

/* ---------- 六个分组：错位卡片 ---------- */
.page-products .grp-grid { display: grid; gap: 14px; margin-top: 24px; }
.page-products .grp-card {
  padding: 20px 20px 22px;
  border-radius: var(--radius-md);
  background: var(--warm);
  border: 1px solid var(--prod-line);
  border-top: 4px solid var(--gold);
}
.page-products .grp-num {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  color: var(--slate);
  margin: 0 0 8px;
}
.page-products .grp-card h3 {
  font-family: var(--font-head);
  font-size: var(--fs-21);
  margin: 0 0 6px;
}
.page-products .grp-freq {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--deep-2);
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--prod-line);
}
.page-products .grp-card p:last-child {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: #3b4753;
}

/* ---------- 时间轴 ---------- */
.page-products .sec--timeline {
  background: linear-gradient(180deg, rgba(143, 189, 180, 0.16), rgba(246, 241, 231, 0) 62%);
  border-radius: var(--radius-lg);
  padding-left: 18px;
  padding-right: 18px;
}
.page-products .tl-pills {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 6px 0 12px;
  margin-bottom: 6px;
}
.page-products .year-pill {
  flex: 0 0 auto;
  padding: 8px 16px;
  border-radius: var(--pill);
  border: 1px solid var(--prod-line);
  background: var(--warm);
  color: var(--deep);
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.2s ease, color 0.2s ease;
}
.page-products .year-pill:hover,
.page-products .year-pill:focus-visible { background: var(--deep); color: var(--warm); border-color: var(--deep); }
.page-products .year-pill--archive { border-color: var(--wine); color: var(--wine); }
.page-products .year-pill--archive:hover,
.page-products .year-pill--archive:focus-visible { background: var(--wine); color: var(--warm); border-color: var(--wine); }

.page-products .year-block {
  background: var(--warm);
  border-left: 3px solid var(--mist);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 18px 18px 16px;
  margin-bottom: 14px;
}
.page-products .year-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--prod-line);
}
.page-products .year-num {
  font-family: var(--font-mono);
  font-size: var(--fs-28);
  color: var(--deep);
  letter-spacing: 0.02em;
}
.page-products .year-note { font-size: var(--fs-12); color: var(--slate); }

.page-products .ver-list { display: grid; gap: 10px; }
.page-products .ver-item {
  position: relative;
  border-left: 1px solid var(--prod-line);
  padding: 2px 0 2px 16px;
}
.page-products .ver-item::before {
  content: "";
  position: absolute;
  left: -4.5px;
  top: 14px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--mist);
}
.page-products .ver-item--lg::before {
  left: -6.5px;
  width: 12px;
  height: 12px;
  background: var(--gold);
}
.page-products .ver-sum {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  cursor: pointer;
  list-style: none;
  padding: 4px 0;
}
.page-products .ver-sum::-webkit-details-marker { display: none; }
.page-products .ver-sum::after {
  content: "＋";
  margin-left: auto;
  color: var(--slate);
  font-size: var(--fs-14);
}
.page-products .ver-item[open] .ver-sum::after { content: "－"; color: var(--gold); }
.page-products .ver-sum .mono-num {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  color: var(--deep-2);
}
.page-products .ver-name { font-size: var(--fs-17); color: var(--ink); }
.page-products .ver-body {
  padding: 6px 0 8px;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: #3b4753;
}
.page-products .ver-body p { margin: 0; }

.page-products .year-block--compact { border-left-style: dashed; }
.page-products .ver-plain { margin: 0; padding: 0; list-style: none; display: grid; gap: 8px; }
.page-products .ver-plain li {
  font-size: var(--fs-14);
  line-height: 1.85;
  color: #3b4753;
  padding-left: 14px;
  position: relative;
}
.page-products .ver-plain li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 1px;
  background: var(--slate);
}
.page-products .ver-plain .mono-num { margin-right: 8px; }

/* ---------- 步骤 ---------- */
.page-products .steps {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-products .step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 16px 18px;
  border-radius: var(--radius-md);
  background: var(--warm);
  border: 1px solid var(--prod-line);
}
.page-products .step-num {
  font-family: var(--font-mono);
  font-size: var(--fs-21);
  color: var(--gold);
  line-height: 1.2;
}
.page-products .step h3 {
  font-family: var(--font-head);
  font-size: var(--fs-17);
  margin: 0 0 4px;
}
.page-products .step p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--slate);
}

/* ---------- 对照表 ---------- */
.page-products .diff-grid { display: grid; gap: 12px; margin-top: 22px; }
.page-products .diff-card {
  padding: 18px 18px 20px;
  border-radius: var(--radius-md);
  background: var(--warm);
  border: 1px solid var(--prod-line);
  border-left-width: 5px;
}
.page-products .diff-card--add { border-left-color: var(--deep); }
.page-products .diff-card--edit { border-left-color: var(--gold); }
.page-products .diff-card--off { border-left-color: var(--mist); }
.page-products .diff-card h3 {
  font-family: var(--font-head);
  font-size: var(--fs-21);
  margin: 0 0 8px;
}
.page-products .diff-card p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: #3b4753;
}

/* ---------- 下一步 ---------- */
.page-products .next-grid { display: grid; gap: 12px; margin-top: 20px; }
.page-products .next-card {
  display: block;
  padding: 20px;
  border-radius: var(--radius-md);
  background: var(--warm);
  border: 1px solid var(--prod-line);
  border-top: 5px solid var(--gold);
  text-decoration: none;
  color: inherit;
  transition: transform 0.25s ease, border-color 0.25s ease;
}
.page-products .next-card:hover,
.page-products .next-card:focus-visible { transform: translateY(-3px); border-color: var(--deep-2); }
.page-products .next-card h3 {
  font-family: var(--font-head);
  font-size: var(--fs-21);
  margin: 0 0 8px;
}
.page-products .next-card p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--slate);
}
.page-products .next-card--coral { border-top-color: var(--coral); }
.page-products .next-figure {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: linear-gradient(140deg, var(--deep), var(--indigo));
}
.page-products .next-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 640px) {
  .page-products .band-row { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-products .band-card { grid-template-columns: auto minmax(0, 1fr); }
  .page-products .grp-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-products .ver-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-products .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-products .diff-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-products .next-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-products .sec-cols { grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); align-items: start; }
  .page-products .sec-cols--flip { grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr); }
  .page-products .sec-cols--flip .side-figure { order: -1; }
}

/* ---------- 桌面：常驻左索引带 ---------- */
@media (min-width: 1024px) {
  .page-products .prod-layout {
    display: grid;
    grid-template-columns: var(--prod-rail) minmax(0, 1fr);
    gap: 52px;
    align-items: start;
    padding-top: 46px;
  }
  .page-products .index-rail {
    position: sticky;
    top: calc(var(--header-h) + 18px);
    margin-bottom: 0;
    border-bottom: 0;
    padding-bottom: 0;
  }
  .page-products .index-rail nav {
    flex-direction: column;
    overflow: visible;
    gap: 4px;
  }
  .page-products .index-rail a {
    border: 0;
    background: transparent;
    border-radius: 0;
    padding: 6px 0 6px 12px;
    border-left: 2px solid transparent;
    font-size: var(--fs-14);
  }
  .page-products .index-rail a[aria-current="true"] {
    border-left-color: var(--gold);
    box-shadow: none;
    color: var(--deep);
  }
  .page-products .grp-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 16px;
  }
  .page-products .grp-card:nth-child(1) { grid-column: span 4; }
  .page-products .grp-card:nth-child(2) { grid-column: span 2; margin-top: 34px; }
  .page-products .grp-card:nth-child(3) { grid-column: span 2; }
  .page-products .grp-card:nth-child(4) { grid-column: span 4; margin-top: 22px; }
  .page-products .grp-card:nth-child(5) { grid-column: span 3; }
  .page-products .grp-card:nth-child(6) { grid-column: span 3; margin-top: 30px; }
  .page-products .next-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-products .next-figure { grid-column: span 3; max-height: 340px; }
  .page-products .next-figure img { max-height: 340px; object-fit: cover; }
}

@media (prefers-reduced-motion: reduce) {
  .page-products .next-card,
  .page-products .index-rail a,
  .page-products .year-pill { transition: none; }
  .page-products .next-card:hover,
  .page-products .next-card:focus-visible { transform: none; }
}