.page-products {
  --pp-line: var(--edge);
  --pp-line-soft: var(--edge-soft);
  --pp-gap: clamp(16px, 2.6vw, 28px);
  --pp-panel: rgba(23, 28, 74, 0.62);
}

.page-products img {
  display: block;
  max-width: 100%;
  height: auto;
}

/* ---------- Hero ---------- */
.page-products .products-hero {
  padding: clamp(20px, 4.4vw, 52px) 0 0;
}

.page-products .products-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(29px, 5.3vw, 52px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--paper);
  max-width: 20ch;
}

.page-products .products-lede {
  margin: 18px 0 0;
  max-width: 58ch;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.78;
  color: var(--text-mute);
}

.page-products .products-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-products .products-hero-visual {
  margin-top: clamp(26px, 4.4vw, 46px);
  border: var(--bw) solid var(--edge);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

/* ---------- Chapter index ---------- */
.page-products .chapter-nav {
  margin-top: clamp(30px, 5vw, 56px);
}

.page-products .pp-index {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
  grid-template-columns: 1fr;
}

.page-products .pp-index .chapter-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 13px 15px;
  border: var(--bw) solid var(--pp-line-soft);
  color: var(--text-dark);
  text-decoration: none;
  font-size: 15px;
  line-height: 1.4;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

.page-products .pp-idx-num {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-products .pp-index .chapter-link:hover,
.page-products .pp-index .chapter-link:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-products .pp-index .chapter-link[aria-current="true"] {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(53, 230, 208, 0.09);
}

/* ---------- Chapter head ---------- */
.page-products .pp-chapter-head {
  display: flex;
  align-items: baseline;
  gap: clamp(12px, 2vw, 22px);
  border-top: var(--bw) solid var(--pp-line);
  padding-top: 18px;
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-products .pp-chapter-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.26;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-products .section-paper .pp-chapter-head {
  border-top-color: rgba(42, 48, 80, 0.32);
}

.page-products .section-paper .pp-chapter-head h2 {
  color: var(--slate);
}

.page-products .section-paper .index-num {
  color: var(--band-teal);
}

/* ---------- Body text ---------- */
.page-products .pp-text {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-mute);
  max-width: 68ch;
}

.page-products .section-paper .pp-text {
  color: var(--slate);
}

.page-products .pp-text a,
.page-products .pp-note a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-products .section-paper .pp-text a,
.page-products .section-paper .pp-note a {
  color: var(--band-teal);
}

/* ---------- Split grid ---------- */
.page-products .pp-split {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  align-items: start;
}

.page-products .pp-split-main,
.page-products .pp-split-aside {
  min-width: 0;
}

/* ---------- Skill tree ---------- */
.page-products .pp-tree {
  list-style: none;
  position: relative;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0 0 0 26px;
}

.page-products .pp-tree::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--cyan) 42%, var(--cyan) 100%);
}

.page-products .pp-node {
  position: relative;
  margin-bottom: 14px;
}

.page-products .pp-node::before {
  content: "";
  position: absolute;
  left: -20px;
  top: 21px;
  width: 14px;
  height: 2px;
  background: var(--cyan);
}

.page-products .pp-node--test::before {
  background: var(--coral);
}

.page-products .pp-branch {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  padding: 14px 16px;
  border: var(--bw) solid var(--pp-line);
  background: var(--pp-panel);
  cursor: pointer;
  list-style: none;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.page-products .pp-branch::-webkit-details-marker {
  display: none;
}

.page-products .pp-branch:hover {
  border-color: var(--cyan);
}

.page-products .pp-node--test .pp-branch:hover {
  border-color: var(--coral);
}

.page-products .pp-branch-code {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  flex: 0 0 auto;
  background: var(--gold);
  color: var(--ink-900);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0;
}

.page-products .pp-node--test .pp-branch-code {
  background: var(--coral);
  color: #1A0510;
}

.page-products .pp-branch-name {
  font-family: var(--font-display);
  font-size: clamp(16px, 1.9vw, 19px);
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-products .pp-branch-meta {
  margin-left: auto;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--index);
  white-space: nowrap;
}

.page-products .pp-branch-body {
  border: var(--bw) solid var(--pp-line);
  border-top: 0;
  padding: 16px 18px 18px;
  background: rgba(11, 16, 48, 0.72);
}

.page-products .pp-branch-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-mute);
}

.page-products .pp-cond {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-products .pp-cond li {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--text-mute);
}

.page-products .pp-cond .mono {
  flex: 0 0 auto;
  min-width: 5.6em;
  color: var(--cyan);
  font-size: 13px;
  letter-spacing: 0.06em;
}

/* ---------- Note card ---------- */
.page-products .pp-note {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-products .pp-note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-mute);
}

.page-products .pp-note + .pp-note {
  margin-top: 16px;
}

.page-products .section-paper .pp-note p {
  color: var(--slate);
}

.page-products .section-paper .pp-note .pp-cond li {
  color: var(--slate);
}

.page-products .section-paper .pp-note .pp-cond .mono {
  color: var(--band-teal);
}

/* ---------- Member centre ---------- */
.page-products .pp-member {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(22px, 3vw, 34px);
}

.page-products .pp-member-figure {
  border: var(--bw) solid rgba(42, 48, 80, 0.3);
}

.page-products .pp-version-pair {
  display: grid;
  gap: 16px;
}

.page-products .pp-version-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px 20px;
}

.page-products .pp-version-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.74;
  color: var(--slate);
}

.page-products .pp-version-card--test {
  border-color: var(--coral);
  box-shadow: 6px 6px 0 rgba(255, 107, 90, 0.3);
}

.page-products .pp-test-flag {
  position: absolute;
  top: -13px;
  right: 16px;
  margin: 0;
  padding: 3px 11px;
  background: var(--coral);
  color: #1A0510;
  font-size: 12px;
  letter-spacing: 0.16em;
  font-weight: 700;
}

.page-products .pp-version-code {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: #8A5A00;
}

.page-products .pp-version-card--test .pp-version-code {
  color: #A32A1B;
}

.page-products .pp-version-card .pp-cond {
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px solid rgba(42, 48, 80, 0.22);
}

.page-products .pp-version-card .pp-cond li {
  color: var(--slate);
}

.page-products .pp-version-card .pp-cond .mono {
  color: var(--band-teal);
}

/* ---------- Table ---------- */
.page-products .pp-table-wrap {
  margin-top: clamp(22px, 3vw, 34px);
}

.page-products .pp-caption {
  caption-side: top;
  text-align: left;
  padding: 0 0 10px;
  font-size: 12.5px;
  letter-spacing: 0.12em;
  color: var(--index);
}

.page-products .pp-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: 15px;
}

.page-products .pp-table th,
.page-products .pp-table td {
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
  line-height: 1.62;
  border-bottom: 1px solid rgba(42, 48, 80, 0.2);
}

.page-products .pp-table thead th {
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.02em;
  background: var(--band-teal);
  color: var(--paper);
  border-bottom: 0;
}

.page-products .pp-table tbody th {
  font-weight: 600;
  color: var(--slate);
  white-space: nowrap;
}

.page-products .pp-table tbody td {
  color: var(--slate);
}

.page-products .pp-table tbody tr:nth-child(even) {
  background: rgba(42, 48, 80, 0.05);
}

.page-products .pp-table tbody tr[data-diff-row] > :first-child {
  border-left: 3px solid var(--index);
}

.page-products .pp-table tbody tr[data-diff-row="diff"] > :first-child {
  border-left-color: var(--coral);
}

.page-products .pp-table tbody tr[data-diff-row="same"] > :first-child {
  border-left-color: rgba(42, 48, 80, 0.28);
}

.page-products .pp-table--release .mono {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--band-teal);
}

/* ---------- Band section ---------- */
.page-products .pp-band-section {
  margin: clamp(34px, 6vw, 72px) 0;
}

.page-products .pp-band-body {
  padding: clamp(34px, 5.4vw, 72px) 0 0;
}

.page-products .pp-line-figure {
  margin: clamp(26px, 4vw, 44px) 0 0;
  border: var(--bw) solid var(--pp-line);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

/* ---------- Compat scale ---------- */
.page-products .pp-compat {
  margin: clamp(20px, 3vw, 30px) 0 0;
}

.page-products .pp-compat-label {
  margin: 0 0 12px;
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--index);
}

.page-products .pp-scale {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
}

.page-products .pp-scale li {
  padding: 7px 12px;
  border: var(--bw) solid var(--pp-line);
  background: var(--pp-panel);
  color: var(--cyan);
  font-size: 13px;
  letter-spacing: 0.06em;
}

/* ---------- List ---------- */
.page-products .pp-list {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-products .pp-list li {
  padding: 2px 0 2px 16px;
  border-left: 3px solid var(--gold);
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-mute);
}

.page-products .pp-list strong {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-display);
  font-size: 15.5px;
  color: var(--paper);
  letter-spacing: 0.01em;
}

.page-products .section-paper .pp-list li {
  color: var(--slate);
}

.page-products .section-paper .pp-list strong {
  color: var(--slate);
}

/* ---------- Prerequisites ---------- */
.page-products .pp-prereq {
  display: grid;
  gap: 16px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-products .pp-prereq-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px;
}

.page-products .pp-prereq-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-mute);
}

.page-products .pp-prereq-num {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
  padding-bottom: 10px;
  border-bottom: 2px solid rgba(242, 180, 65, 0.32);
}

.page-products .pp-pitfalls {
  margin-top: clamp(28px, 4.4vw, 48px);
}

.page-products .pp-pitfalls h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.2vw, 22px);
  color: var(--paper);
}

.page-products .pp-pitfall-list {
  list-style: none;
  counter-reset: pp-pitfall;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-products .pp-pitfall-list li {
  counter-increment: pp-pitfall;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  padding: 16px 18px;
  border: var(--bw) solid var(--pp-line);
  background: var(--pp-panel);
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-mute);
}

.page-products .pp-pitfall-list li::before {
  content: "0" counter(pp-pitfall);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--coral);
  padding-top: 2px;
}

/* ---------- Release ---------- */
.page-products .pp-diff-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: clamp(22px, 3vw, 32px) 0 14px;
}

.page-products .pp-diff-head h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(17px, 2vw, 21px);
  color: var(--slate);
}

.page-products .pp-diff-btn {
  font-size: 14px;
}

.page-products .section-paper .pp-note {
  border-color: rgba(42, 48, 80, 0.28);
  box-shadow: 6px 6px 0 rgba(42, 48, 80, 0.16);
}

.page-products .pp-release-figure {
  margin: clamp(32px, 5vw, 56px) auto 0;
  max-width: var(--shell-max);
  padding: 0 var(--gutter);
  border: 0;
  box-shadow: none;
}

.page-products .pp-release-figure img {
  width: 100%;
  border: var(--bw) solid var(--pp-line);
  box-shadow: var(--shadow-hard);
  object-fit: cover;
}

/* ---------- CTA ---------- */
.page-products .pp-cta {
  border-top: var(--bw) solid var(--pp-line);
  padding-top: clamp(30px, 4.4vw, 52px);
  padding-bottom: clamp(30px, 4.4vw, 56px);
}

.page-products .pp-cta-title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(21px, 2.8vw, 30px);
  line-height: 1.26;
  letter-spacing: -0.01em;
  color: var(--paper);
}

/* ---------- Motion ---------- */
@keyframes pp-branch-pulse {
  0%, 100% { opacity: 0.65; }
  50% { opacity: 1; }
}

.page-products .pp-node--test .pp-branch-code {
  animation: pp-branch-pulse 1.6s ease-in-out infinite;
}

/* ---------- Responsive ---------- */
@media (min-width: 600px) {
  .page-products .pp-index {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-products .pp-version-pair {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-products .pp-prereq {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-products .pp-index {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-products .pp-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(28px, 4vw, 52px);
  }

  .page-products .pp-member {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(26px, 3.6vw, 44px);
  }

  .page-products .pp-split--web {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }

  .page-products .pp-release-figure {
    padding: 0 var(--gutter);
  }
}

@media (max-width: 599px) {
  .page-products .pp-branch-meta {
    margin-left: 0;
    width: 100%;
  }

  .page-products .pp-cond li {
    display: block;
  }

  .page-products .pp-cond .mono {
    display: block;
    min-width: 0;
    margin-bottom: 2px;
  }

  .page-products .pp-table {
    min-width: 480px;
    font-size: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-products *,
  .page-products *::before,
  .page-products *::after {
    animation: none !important;
    transition: none !important;
  }
}