.page-products {
  --pp-space: clamp(64px, 10vw, 128px);
  --pp-gutter: clamp(18px, 4vw, 32px);
  background: var(--ink-night);
  color: var(--paper);
  padding-bottom: clamp(72px, 9vw, 120px);
}

/* 索引轨道：移动端收起，桌面端恢复 */
.page-products .index-rail {
  display: none;
}
@media (min-width: 1200px) {
  .page-products .index-rail {
    display: flex;
    flex-direction: column;
    gap: 20px;
  }
}

/* 面包屑与首屏 */
.page-products .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: clamp(96px, 14vw, 152px);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--note);
}
.page-products .breadcrumb a {
  color: var(--note);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}
.page-products .breadcrumb a:hover {
  color: var(--gold-soft);
  border-bottom-color: var(--gold);
}
.page-products .breadcrumb span[aria-hidden] {
  color: var(--sketch);
}

.page-products .tools-hero {
  padding: clamp(28px, 5vw, 52px) 0 clamp(8px, 2vw, 20px);
}
.page-products .tools-hero .eyebrow {
  color: var(--gold);
  font-size: 12px;
  letter-spacing: 0.18em;
  margin: 0;
}
.page-products .tools-hero h1 {
  margin: 18px 0 0;
  color: var(--paper);
}
.page-products .tools-lede {
  max-width: 42ch;
  margin: 20px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--button-text);
}
.page-products .tools-text {
  max-width: 46ch;
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--note);
}
.page-products .tools-text .link,
.page-products .annot .link {
  color: var(--gold-soft);
}

/* 章节骨架 */
.page-products .tools-section {
  padding-top: var(--pp-space);
}
.page-products .tools-section--board {
  background: var(--board);
  padding-bottom: var(--pp-space);
  margin-top: var(--pp-space);
}
.page-products .sec-head {
  max-width: 62ch;
  padding-bottom: clamp(28px, 4vw, 48px);
}
.page-products .section-index {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gold);
}
.page-products .tools-h2 {
  margin: 0 0 14px;
  font-size: clamp(26px, 5vw, 40px);
  font-weight: 300;
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-products .annot {
  margin: 28px 0 0;
  padding-left: 12px;
  border-left: 1px solid var(--gold);
  font-size: 12px;
  line-height: 1.8;
  color: var(--note);
  max-width: 54ch;
}

.page-products .pp-diagonal {
  display: block;
  width: min(100%, 720px);
  height: 1px;
  margin: clamp(32px, 5vw, 56px) 0;
  background: linear-gradient(90deg, var(--gold) 0%, rgba(217, 169, 78, 0) 78%);
  transform: rotate(-1.6deg);
  transform-origin: left center;
}

/* 01 技能树 */
.page-products .skilltree {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 34px;
}
.page-products .skilltree::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--sketch) 85%);
}
.page-products .tree-node {
  position: relative;
  padding-bottom: clamp(16px, 2.4vw, 26px);
}
.page-products .tree-node::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 24px;
  width: 22px;
  height: 1px;
  background: var(--sketch);
}
.page-products .tree-dot {
  position: absolute;
  left: -34px;
  top: 18px;
  width: 11px;
  height: 11px;
  background: var(--ink-night);
  border: 1px solid var(--gold);
}
.page-products .tree-body {
  padding: 18px var(--pp-gutter) 20px;
  background: var(--board);
}
.page-products .tree-node:hover .tree-body,
.page-products .tree-node:focus-within .tree-body {
  border-color: var(--gold);
}
.page-products .tree-id {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
  color: var(--paper);
}
.page-products .tree-key {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--gold);
}
.page-products .tree-note {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--note);
  max-width: 40ch;
}
.page-products .tree-go {
  font-size: 13px;
}
@media (min-width: 1000px) {
  .page-products .skilltree {
    padding-left: 44px;
  }
  .page-products .skilltree::before {
    left: 6px;
  }
  .page-products .tree-dot {
    left: -44px;
  }
  .page-products .tree-node::before {
    left: -32px;
    width: 32px;
  }
  .page-products .tree-note {
    opacity: 0.55;
    transition: opacity 180ms var(--ease);
  }
  .page-products .tree-node:hover .tree-note,
  .page-products .tree-node:focus-within .tree-note {
    opacity: 1;
  }
  .page-products .tree-node:nth-child(2) .tree-body { margin-left: 4%; }
  .page-products .tree-node:nth-child(3) .tree-body { margin-left: 8%; }
  .page-products .tree-node:nth-child(4) .tree-body { margin-left: 12%; }
}

/* 02 横向收藏册 */
.page-products .collection {
  display: flex;
  gap: clamp(14px, 2vw, 22px);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: 4px 0 64px;
  margin: 0;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--sketch) transparent;
}
.page-products .collection-item {
  scroll-snap-align: start;
  position: relative;
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 16px 16px 30px;
  background: var(--board);
  transition: transform 180ms var(--ease), border-color 180ms var(--ease);
}
.page-products .collection-item:nth-child(1) { width: clamp(232px, 74vw, 400px); }
.page-products .collection-item:nth-child(2) { width: clamp(200px, 62vw, 320px); }
.page-products .collection-item:nth-child(3) { width: clamp(220px, 70vw, 360px); }
.page-products .collection-item:nth-child(4) { width: clamp(212px, 66vw, 340px); }
.page-products .collection-item:hover {
  border-color: var(--gold);
}
.page-products .collection-item[data-active] {
  transform: translateY(-4px);
  box-shadow: inset 0 0 0 1px var(--cyan);
}
.page-products .dossier-num {
  position: absolute;
  right: 12px;
  bottom: -0.34em;
  font-size: clamp(56px, 10vw, 96px);
  line-height: 1;
  color: var(--gold);
  opacity: 0.18;
  pointer-events: none;
}
.page-products .dossier-figure {
  margin: 8px 0 0;
  font-size: clamp(56px, 12vw, 88px);
  line-height: 0.9;
  font-weight: 600;
  color: var(--data);
}
.page-products .dossier-title {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}
.page-products .dossier-text {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--note);
}
.page-products .dossier-meta {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 14px;
  margin: auto 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--pitch);
  font-size: 12px;
}
.page-products .dossier-meta dt {
  color: var(--note);
  letter-spacing: 0.06em;
}
.page-products .dossier-meta dd {
  margin: 0;
  color: var(--paper);
}

.page-products .collection-dots {
  display: flex;
  gap: 8px;
  margin-bottom: 8px;
}
.page-products .collection-dots .dot {
  width: 6px;
  height: 6px;
  background: var(--sketch);
  transition: background 180ms var(--ease), transform 180ms var(--ease);
}
.page-products .collection-dots .dot[data-active] {
  background: var(--cyan);
  transform: scale(1.3);
}

/* 对照表 */
.page-products .tools-table {
  width: 100%;
  margin-top: clamp(32px, 5vw, 56px);
  border-collapse: collapse;
  font-size: 14px;
}
.page-products .tools-table caption {
  padding-bottom: 14px;
  text-align: left;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--note);
}
.page-products .tools-table th,
.page-products .tools-table td {
  padding: 14px 16px 14px 0;
  text-align: left;
  border-bottom: 1px solid var(--pitch);
  vertical-align: top;
}
.page-products .tools-table thead th {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gold);
}
.page-products .tools-table tbody th[scope="row"] {
  font-weight: 400;
  color: var(--note);
}
.page-products .tools-table td {
  color: var(--paper);
}
@media (max-width: 719px) {
  .page-products .tools-table,
  .page-products .tools-table tbody,
  .page-products .tools-table tr,
  .page-products .tools-table th,
  .page-products .tools-table td {
    display: block;
    width: 100%;
  }
  .page-products .tools-table thead {
    display: none;
  }
  .page-products .tools-table tr {
    padding: 14px 0;
    border-bottom: 1px solid var(--pitch);
  }
  .page-products .tools-table th,
  .page-products .tools-table td {
    padding: 3px 0;
    border-bottom: 0;
  }
  .page-products .tools-table td::before {
    content: attr(data-label) " · ";
    color: var(--note);
    font-size: 12px;
  }
}

/* 03 版本阶梯 */
.page-products .ladder {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-products .ladder-step {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 10px 18px;
  padding: 20px 18px;
  background: var(--board);
  border-left: 3px solid var(--sketch);
  transition: background 180ms var(--ease), border-color 180ms var(--ease);
}
.page-products .ladder-step:nth-child(2) { border-left-color: var(--gold); }
.page-products .ladder-step:nth-child(3) { border-left-color: var(--data); background: var(--pitch); }
.page-products .ladder-step:hover {
  background: var(--pitch);
}
.page-products .ladder-key {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--gold-soft);
}
.page-products .ladder-step:nth-child(3) .ladder-key { color: var(--data); }
.page-products .ladder-title {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 600;
  color: var(--paper);
}
.page-products .ladder-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--note);
  max-width: 48ch;
}
@media (min-width: 900px) {
  .page-products .ladder-step:nth-child(1) { width: 64%; }
  .page-products .ladder-step:nth-child(2) { width: 82%; }
  .page-products .ladder-step:nth-child(3) { width: 100%; }
}

/* 图片基座 */
.page-products .media-frame {
  overflow: hidden;
  background: var(--pitch);
  margin: 0;
}
.page-products .media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.85) brightness(0.92);
}
.page-products .media-frame figcaption {
  padding: 10px 0 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--note);
}
.page-products .versions-media {
  max-width: 940px;
}

/* 04 / 05 双栏 */
.page-products .split {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}
.page-products .split-main {
  min-width: 0;
}
.page-products .split-media {
  min-width: 0;
}
.page-products .fact-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
}
.page-products .fact-list li {
  font-size: 13px;
  color: var(--note);
}
.page-products .fact-list .num {
  margin-right: 6px;
  font-size: 20px;
  color: var(--gold-soft);
}
@media (min-width: 900px) {
  .page-products .split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
  .page-products .split--reverse {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
  .page-products .split--reverse .split-main { order: 2; }
  .page-products .split--reverse .split-media { order: 1; }
  .page-products .split-media { margin-top: 48px; }
}

/* 06 数据条横幅 */
.page-products .strip-band {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
  padding: clamp(24px, 4vw, 48px);
  background: var(--board);
}
.page-products .strip-figure {
  min-width: 0;
}
.page-products .strip-round {
  margin: 4px 0 0;
  font-size: clamp(68px, 15vw, 120px);
  line-height: 0.88;
  font-weight: 600;
  color: var(--data);
}
.page-products .strip-caption {
  margin: 10px 0 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--note);
}
.page-products .strip-copy .tools-h2 {
  font-size: clamp(22px, 3.6vw, 32px);
}
@media (min-width: 900px) {
  .page-products .strip-band {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    align-items: center;
  }
}

/* 07 最短路径 */
.page-products .paths {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 22px;
}
.page-products .path-item {
  padding-top: 20px;
  border-top: 1px solid var(--pitch);
  transition: border-color 180ms var(--ease);
}
.page-products .path-item:hover {
  border-top-color: var(--gold);
}
.page-products .path-role {
  margin: 0 0 10px;
  font-size: 20px;
  font-weight: 600;
  color: var(--paper);
}
.page-products .path-steps {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--note);
  max-width: 42ch;
}
.page-products .path-item .link {
  font-size: 13px;
}
@media (min-width: 900px) {
  .page-products .paths {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
    align-items: start;
  }
  .page-products .path-item:nth-child(2) { margin-top: 40px; }
  .page-products .path-item:nth-child(3) { margin-top: 80px; }
}
.page-products .closing-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  margin: 26px 0 0;
  font-size: 13px;
}
.page-products .closing-links .link {
  color: var(--gold-soft);
}

@media (prefers-reduced-motion: reduce) {
  .page-products .collection-item,
  .page-products .tree-note,
  .page-products .dossier-num,
  .page-products .collection-dots .dot {
    transition: none;
  }
  .page-products .collection-item[data-active] {
    transform: none;
  }
}