.page-products {
  --grid-gap: 1.25rem;
  --c-surface-muted: #F4F6F8;
  --c-surface-dark: #1A2334;
  --c-line-soft: rgba(255,255,255,0.14);
}

/* ===== Breadcrumb ===== */
.page-products .breadcrumb-bar {
  border-bottom: 1px solid var(--c-light-gray);
  padding: var(--space-4) 0;
  background: var(--c-white);
}

.page-products .breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--c-mid-gray);
}

.page-products .breadcrumb a {
  color: var(--c-deep-space);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-products .breadcrumb a:hover {
  color: var(--c-accent);
}

.page-products .breadcrumb__sep {
  color: var(--c-light-gray);
}

/* ===== Shared layout adjustments ===== */
.page-products .page-grid {
  display: grid;
  gap: var(--grid-gap);
}

.page-products .index-rail {
  font-size: 0.9rem;
}

.page-products .content-rail {
  min-width: 0;
}

.page-products .rail-note {
  margin: var(--space-3) 0 0;
  color: var(--c-mid-gray);
  font-size: 0.85rem;
  line-height: 1.6;
  border-left: 2px solid var(--c-prairie);
  padding-left: var(--space-3);
}

.page-products .section-head {
  margin-bottom: var(--space-4);
}

.page-products .section-head h2 {
  margin: 0;
}

.page-products .section-intro {
  color: var(--c-mid-gray);
  line-height: 1.7;
  max-width: 56rem;
  margin-bottom: var(--space-6);
}

/* ===== 01 Service Overview ===== */
.page-products .service-overview {
  background:
    radial-gradient(900px 420px at 85% -10%, rgba(61,153,112,0.35), transparent 60%),
    linear-gradient(135deg, var(--c-deep-space) 0%, #0e2547 100%);
  color: var(--c-white);
  padding: var(--space-7) 0;
  overflow: hidden;
  position: relative;
}

.page-products .service-overview::after {
  content: "";
  position: absolute;
  width: 480px;
  height: 480px;
  right: -180px;
  top: -180px;
  border: 1px solid var(--c-line-soft);
  border-radius: 50%;
  pointer-events: none;
}

.page-products .service-overview .rail-note {
  color: rgba(255,255,255,0.65);
  border-left-color: var(--c-accent);
}

.page-products .overview-layout {
  display: grid;
  gap: var(--space-6);
}

.page-products .overview-text h1 {
  font-size: clamp(1.75rem, 5vw, 3rem);
  line-height: 1.12;
  margin: 0 0 var(--space-5);
  color: var(--c-white);
  letter-spacing: -0.02em;
}

.page-products .overview-lead {
  font-size: clamp(1.0625rem, 2.2vw, 1.25rem);
  line-height: 1.65;
  color: rgba(255,255,255,0.85);
  margin: 0 0 var(--space-4);
}

.page-products .overview-text > p:not(.overview-lead) {
  color: rgba(255,255,255,0.68);
  line-height: 1.7;
  margin: 0 0 var(--space-6);
}

.page-products .overview-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.page-products .overview-figure {
  margin: 0;
  border: 1px solid var(--c-line-soft);
  background: rgba(0,0,0,0.18);
  align-self: start;
}

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

.page-products .overview-figure figcaption {
  padding: var(--space-3) var(--space-4);
  font-size: 0.78rem;
  color: rgba(255,255,255,0.6);
  border-top: 1px solid var(--c-line-soft);
  font-family: var(--font-mono);
}

.page-products .rail-figure {
  margin: var(--space-5) 0 0;
  border: 1px solid var(--c-line-soft);
}

.page-products .rail-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-products .rail-figure figcaption {
  padding: var(--space-2) var(--space-3);
  font-size: 0.7rem;
  color: rgba(255,255,255,0.5);
  font-family: var(--font-mono);
}

/* ===== 02 Desktop Panel ===== */
.page-products .panel-section {
  background: var(--c-white);
  padding: var(--space-7) 0;
}

.page-products .index-nav {
  display: grid;
  gap: var(--space-2);
  margin-top: var(--space-5);
  border-left: 1px solid var(--c-light-gray);
  padding-left: var(--space-4);
}

.page-products .index-nav a {
  color: var(--c-mid-gray);
  text-decoration: none;
  font-size: 0.85rem;
  padding: 2px 0;
  transition: color 0.2s ease;
}

.page-products .index-nav a:hover {
  color: var(--c-accent);
}

.page-products .version-block h3,
.page-products .scene-block h3,
.page-products .member-section .content-rail > h3,
.page-products .environment-section .content-rail > h3 {
  font-size: 1.05rem;
  margin: var(--space-5) 0 var(--space-3);
}

.page-products .version-grid {
  display: grid;
  gap: var(--grid-gap);
}

.page-products .version-card {
  position: relative;
  background: var(--c-deep-space);
  color: var(--c-white);
  border-color: var(--c-deep-space);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-products .version-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(11,29,58,0.16);
}

.page-products .version-card__label {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.6);
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
}

.page-products .version-card__num {
  font-size: 3rem;
  font-weight: 700;
  margin: 0;
  color: var(--c-accent);
  font-family: var(--font-mono);
  line-height: 1.1;
}

.page-products .version-card__desc {
  margin: var(--space-2) 0 0;
  color: rgba(255,255,255,0.75);
  font-size: 0.9rem;
}

.page-products .version-records {
  border: 1px solid var(--c-light-gray);
  background: var(--c-white);
  align-self: start;
}

.page-products .version-records summary {
  cursor: pointer;
  padding: var(--space-4) var(--space-5);
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--c-deep-space);
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.page-products .version-records summary::-webkit-details-marker {
  display: none;
}

.page-products .version-records summary::before {
  content: "+";
  font-family: var(--font-mono);
  color: var(--c-accent);
  font-size: 1.1rem;
}

.page-products .version-records[open] summary::before {
  content: "–";
}

.page-products .version-records ul {
  margin: 0;
  padding: 0 var(--space-5) var(--space-4);
  list-style: none;
  border-top: 1px solid var(--c-light-gray);
  padding-top: var(--space-3);
}

.page-products .version-records li {
  padding: var(--space-2) 0;
  font-size: 0.875rem;
  color: var(--c-mid-gray);
  border-bottom: 1px dashed var(--c-light-gray);
}

.page-products .version-records li:last-child {
  border-bottom: none;
}

.page-products .version-records strong {
  font-family: var(--font-mono);
  color: var(--c-deep-space);
  margin-right: var(--space-1);
}

.page-products .feature-grid {
  display: grid;
  gap: var(--grid-gap);
  margin-top: var(--space-6);
}

.page-products .feature-card {
  border-top: 3px solid var(--c-deep-space);
  transition: transform 0.2s ease;
}

.page-products .feature-card:hover {
  transform: translateY(-2px);
}

.page-products .feature-card h3 {
  margin: var(--space-4) 0 var(--space-2);
  font-size: 1.05rem;
}

.page-products .feature-card p {
  margin: 0;
  color: var(--c-mid-gray);
  font-size: 0.9rem;
  line-height: 1.6;
}

.page-products .feature-icon {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.page-products .feature-icon--grid {
  color: var(--c-prairie);
}

.page-products .feature-icon--shield {
  color: var(--c-accent);
}

.page-products .feature-icon--bolt {
  color: var(--c-deep-space);
}

.page-products .scene-block {
  margin-top: var(--space-6);
  background: var(--c-surface-muted);
  padding: var(--space-5);
  border-left: 3px solid var(--c-prairie);
}

.page-products .step-list {
  list-style: none;
  padding: 0;
  margin: var(--space-3) 0 0;
  counter-reset: step;
  display: grid;
  gap: var(--space-4);
}

.page-products .step-list li {
  counter-increment: step;
  position: relative;
  padding-left: 2.5rem;
  color: var(--c-mid-gray);
  line-height: 1.6;
  font-size: 0.9rem;
}

.page-products .step-list li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  width: 1.625rem;
  height: 1.625rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--c-deep-space);
  color: var(--c-white);
  font-family: var(--font-mono);
  font-size: 0.7rem;
}

.page-products .step-list strong {
  color: var(--c-ink);
}

/* ===== 03 Member Benefits ===== */
.page-products .member-section {
  background: var(--c-surface-muted);
  padding: var(--space-7) 0;
}

.page-products .member-section .rail-note {
  border-left-color: var(--c-accent);
}

.page-products .member-layout {
  display: grid;
  gap: var(--space-6);
}

.page-products .tier-grid {
  display: grid;
  gap: var(--grid-gap);
}

.page-products .tier-card {
  position: relative;
  border-top: 3px solid var(--c-deep-space);
  display: flex;
  flex-direction: column;
}

.page-products .tier-card--pro {
  border-top-color: var(--c-prairie);
}

.page-products .tier-card--premium {
  border-top-color: var(--c-accent);
}

.page-products .tier-card__badge {
  position: absolute;
  top: -0.5rem;
  right: var(--space-4);
  background: var(--c-prairie);
  color: var(--c-white);
  font-size: 0.7rem;
  padding: 2px 10px;
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
}

.page-products .tier-card--premium .tier-card__badge {
  background: var(--c-accent);
  color: var(--c-ink);
}

.page-products .tier-card h3 {
  margin: 0 0 var(--space-1);
  font-size: 1.125rem;
  color: var(--c-deep-space);
}

.page-products .tier-card__scope {
  margin: 0 0 var(--space-4);
  color: var(--c-mid-gray);
  font-size: 0.8rem;
  font-family: var(--font-mono);
}

.page-products .tier-card__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: var(--space-2);
  flex: 1;
}

.page-products .tier-card__list li {
  position: relative;
  padding-left: 1.25rem;
  font-size: 0.875rem;
  color: var(--c-mid-gray);
  line-height: 1.5;
}

.page-products .tier-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5rem;
  width: 0.5rem;
  height: 0.5rem;
  background: var(--c-deep-space);
}

.page-products .tier-card--pro .tier-card__list li::before {
  background: var(--c-prairie);
}

.page-products .tier-card--premium .tier-card__list li::before {
  background: var(--c-accent);
}

.page-products .member-figure {
  margin: 0;
  border: 1px solid var(--c-light-gray);
  background: var(--c-white);
  align-self: start;
}

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

.page-products .member-figure figcaption {
  padding: var(--space-3) var(--space-4);
  font-size: 0.78rem;
  color: var(--c-mid-gray);
  border-top: 1px solid var(--c-light-gray);
  font-family: var(--font-mono);
}

/* ===== 04 Function List ===== */
.page-products .function-section {
  background:
    radial-gradient(800px 400px at 15% 0%, rgba(11,29,58,0.55), transparent 60%),
    var(--c-ink);
  color: var(--c-white);
  padding: var(--space-7) 0;
}

.page-products .function-section .rail-note {
  color: rgba(255,255,255,0.65);
}

.page-products .function-section .section-head h2 {
  color: var(--c-white);
}

.page-products .function-section .section-intro {
  color: rgba(255,255,255,0.7);
}

.page-products .func-filter-wrap {
  position: relative;
}

.page-products .func-filter-wrap > input[type="radio"] {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.page-products .func-filter__labels {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
}

.page-products .func-filter__labels label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-4);
  border: 1px solid rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.06);
  color: rgba(255,255,255,0.8);
  font-size: 0.85rem;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  user-select: none;
}

.page-products .func-filter__labels label:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}

.page-products .func-filter__count {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  opacity: 0.6;
}

.page-products #filter-all:checked ~ .func-filter__labels label[for="filter-all"],
.page-products #filter-core:checked ~ .func-filter__labels label[for="filter-core"],
.page-products #filter-account:checked ~ .func-filter__labels label[for="filter-account"],
.page-products #filter-member:checked ~ .func-filter__labels label[for="filter-member"] {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: var(--c-ink);
}

.page-products .func-grid {
  display: grid;
  gap: var(--grid-gap);
}

.page-products .func-grid .func-card {
  display: block;
  padding: 0;
  overflow: hidden;
}

.page-products #filter-core:checked ~ .func-grid .func-card:not([data-category="core"]),
.page-products #filter-account:checked ~ .func-grid .func-card:not([data-category="account"]),
.page-products #filter-member:checked ~ .func-grid .func-card:not([data-category="member"]) {
  display: none;
}

.page-products .func-card details {
  height: 100%;
}

.page-products .func-card summary {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-5);
  cursor: pointer;
  list-style: none;
  height: 100%;
  box-sizing: border-box;
}

.page-products .func-card summary::-webkit-details-marker {
  display: none;
}

.page-products .func-card summary:hover {
  background: var(--c-surface-muted);
}

.page-products .func-card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background: var(--c-deep-space);
  color: var(--c-white);
  flex: none;
}

.page-products .func-card__icon svg {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.page-products .func-card__name {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--c-ink);
  line-height: 1.3;
}

.page-products .func-card__tag {
  margin-left: auto;
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  padding: 2px 8px;
  border: 1px solid var(--c-light-gray);
  color: var(--c-mid-gray);
  white-space: nowrap;
  text-transform: uppercase;
}

.page-products .func-card__body {
  padding: var(--space-4) var(--space-5) var(--space-5);
  color: var(--c-mid-gray);
  font-size: 0.85rem;
  line-height: 1.6;
  border-top: 1px solid var(--c-light-gray);
  background: var(--c-surface-muted);
}

.page-products .func-card__body p {
  margin: 0;
}

.page-products .func-figure {
  margin: var(--space-6) 0 0;
  border: 1px solid var(--c-line-soft);
  background: rgba(255,255,255,0.04);
}

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

.page-products .func-figure figcaption {
  padding: var(--space-3) var(--space-4);
  font-size: 0.78rem;
  color: rgba(255,255,255,0.55);
  border-top: 1px solid var(--c-line-soft);
  font-family: var(--font-mono);
}

/* ===== 05 Environment ===== */
.page-products .environment-section {
  background: var(--c-white);
  padding: var(--space-7) 0;
}

.page-products .env-grid {
  display: grid;
  gap: var(--grid-gap);
}

.page-products .env-card {
  border-left: 3px solid var(--c-deep-space);
}

.page-products .env-card h3 {
  margin: 0 0 var(--space-2);
  font-size: 1.05rem;
}

.page-products .env-card p {
  margin: 0;
  color: var(--c-mid-gray);
  font-size: 0.875rem;
  line-height: 1.6;
}

.page-products .env-figure {
  margin: var(--space-6) 0 0;
  border: 1px solid var(--c-light-gray);
  background: var(--c-surface-muted);
}

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

.page-products .env-figure figcaption {
  padding: var(--space-3) var(--space-4);
  font-size: 0.78rem;
  color: var(--c-mid-gray);
  border-top: 1px solid var(--c-light-gray);
  font-family: var(--font-mono);
}

.page-products .info-list {
  margin: var(--space-3) 0 0;
}

/* ===== 06 Related ===== */
.page-products .related-links {
  background: var(--c-surface-muted);
  padding: var(--space-7) 0;
  border-top: 1px solid var(--c-light-gray);
}

.page-products .related-grid {
  display: grid;
  gap: var(--grid-gap);
}

.page-products .related-card {
  text-decoration: none;
  color: var(--c-ink);
  transition: border-color 0.2s ease, transform 0.2s ease;
  display: block;
}

.page-products .related-card h3 {
  margin: 0 0 var(--space-2);
  font-size: 1rem;
  color: var(--c-deep-space);
}

.page-products .related-card p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--c-mid-gray);
  line-height: 1.5;
}

.page-products .related-card:hover {
  border-color: var(--c-accent);
  transform: translateY(-2px);
}

/* ===== Media Queries ===== */
@media (min-width: 640px) {
  .page-products .version-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  }

  .page-products .func-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-products .related-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .page-products .page-grid {
    grid-template-columns: minmax(220px, 0.3fr) minmax(0, 0.7fr);
    gap: var(--space-6);
  }

  .page-products .service-overview,
  .page-products .panel-section,
  .page-products .member-section,
  .page-products .function-section,
  .page-products .environment-section,
  .page-products .related-links {
    padding: var(--space-7) 0;
  }

  .page-products .overview-layout {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: center;
    gap: var(--space-7);
  }

  .page-products .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-products .member-layout {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    align-items: start;
    gap: var(--space-7);
  }

  .page-products .tier-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-products .func-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-products .env-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-products .related-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-products .rail-figure img {
    max-height: 600px;
    object-position: center;
  }
}

@media (min-width: 1200px) {
  .page-products .func-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}