@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500&family=IBM+Plex+Sans+JP:wght@400;500;600;700&family=Manrope:wght@500;600;700&display=swap");

:root {
  --ink-950: #0b1f2d;
  --ink-800: #17384b;
  --ink-600: #4d6573;
  --paper-000: #ffffff;
  --paper-050: #f5f7f6;
  --paper-100: #edf2f3;
  --line-200: #d7e1e6;
  --line-300: #b7c8d1;
  --blue-600: #1769e8;
  --blue-700: #0d55c7;
  --blue-050: #eef5ff;
  --green-600: #14866d;
  --green-050: #eaf8f4;
  --font-sans: "IBM Plex Sans JP", sans-serif;
  --font-display: "Manrope", "IBM Plex Sans JP", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;
  --max-width: 1200px;
  --gutter: 32px;
  --section-space: 96px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--paper-000);
}

body {
  margin: 0;
  color: var(--ink-950);
  background: var(--paper-000);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

body.menu-open {
  overflow: hidden;
}

a {
  color: inherit;
}

img,
svg {
  display: block;
  max-width: 100%;
}

button,
input,
textarea,
select {
  font: inherit;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 8px;
  left: 8px;
  padding: 10px 14px;
  color: var(--paper-000);
  background: var(--ink-950);
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

:focus-visible {
  outline: 3px solid rgba(23, 105, 232, 0.42);
  outline-offset: 3px;
}

.container {
  width: min(100% - (var(--gutter) * 2), var(--max-width));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  z-index: 100;
  top: 0;
  border-bottom: 1px solid rgba(183, 200, 209, 0.78);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(16px);
}

.header-inner {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-mark {
  width: 29px;
  height: 29px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 2px;
}

.brand-mark span {
  background: var(--blue-600);
}

.brand-mark span:nth-child(2),
.brand-mark span:nth-child(4),
.brand-mark span:nth-child(6),
.brand-mark span:nth-child(8) {
  background: transparent;
}

.brand-word {
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.brand-tagline {
  color: var(--ink-600);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 30px;
}

.site-nav a {
  position: relative;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

.site-nav a:not(.button)::after {
  position: absolute;
  right: 0;
  bottom: -10px;
  left: 0;
  height: 2px;
  content: "";
  background: var(--blue-600);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms ease;
}

.site-nav a:hover::after,
.site-nav a[aria-current="page"]::after {
  transform: scaleX(1);
}

.menu-toggle {
  width: 48px;
  height: 48px;
  display: none;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line-300);
  color: var(--ink-950);
  background: var(--paper-000);
  cursor: pointer;
}

.menu-toggle span,
.menu-toggle span::before,
.menu-toggle span::after {
  width: 20px;
  height: 2px;
  display: block;
  content: "";
  background: currentColor;
  transition: transform 180ms ease;
}

.menu-toggle span {
  position: relative;
}

.menu-toggle span::before {
  position: absolute;
  top: -6px;
}

.menu-toggle span::after {
  position: absolute;
  top: 6px;
}

.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 11px 20px;
  border: 1px solid var(--blue-600);
  border-radius: 2px;
  color: var(--paper-000);
  background: var(--blue-600);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.4;
  text-decoration: none;
  transition: background 180ms ease, border-color 180ms ease, color 180ms ease;
}

.button:hover {
  border-color: var(--blue-700);
  background: var(--blue-700);
}

.button--secondary {
  color: var(--blue-700);
  background: transparent;
}

.button--secondary:hover {
  color: var(--paper-000);
}

.button--small {
  min-height: 42px;
  padding-inline: 16px;
}

.button-arrow {
  font-family: var(--font-mono);
  font-size: 17px;
}

.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line-200);
  background-color: var(--paper-050);
  background-image: url("/assets/img/grid-24.svg");
}

.hero::before {
  position: absolute;
  inset: 0;
  content: "";
  background: rgba(245, 247, 246, 0.88);
}

.hero-inner {
  position: relative;
  min-height: 650px;
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(520px, 1.25fr);
  align-items: center;
  gap: 52px;
  padding-block: 78px;
}

.eyebrow,
.kicker,
.mono-label {
  color: var(--blue-600);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  line-height: 1.5;
  text-transform: uppercase;
}

.hero h1,
.page-hero h1 {
  max-width: 760px;
  margin: 18px 0 22px;
  font-size: clamp(42px, 5.2vw, 72px);
  font-weight: 700;
  letter-spacing: -0.055em;
  line-height: 1.18;
}

.hero-lead {
  max-width: 570px;
  margin: 0;
  color: var(--ink-800);
  font-size: clamp(18px, 2vw, 23px);
  font-weight: 500;
  line-height: 1.7;
}

.hero-support {
  max-width: 560px;
  margin: 20px 0 0;
  color: var(--ink-600);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.hero-blueprint,
.architecture-panel,
.answer-panel,
.case-visual {
  border: 1px solid var(--line-300);
  background-color: rgba(255, 255, 255, 0.92);
  background-image: url("/assets/img/grid-16.svg");
}

.hero-blueprint {
  padding: 22px;
}

.blueprint-header,
.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 22px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-200);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--green-600);
}

.status::before {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  content: "";
  background: var(--green-600);
}

.pipeline {
  display: flex;
  align-items: stretch;
  gap: 22px;
}

.pipeline-node {
  position: relative;
  min-width: 92px;
  min-height: 92px;
  flex: 1 1 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 6px;
  padding: 13px;
  border: 1px solid var(--blue-600);
  background: var(--paper-000);
}

.pipeline-node:not(:last-child)::after {
  position: absolute;
  z-index: 2;
  top: 50%;
  right: -18px;
  width: 12px;
  height: 8px;
  content: "→";
  color: var(--blue-600);
  font-family: var(--font-mono);
  line-height: 1;
  transform: translateY(-50%);
}

.pipeline-node strong {
  font-family: var(--font-display);
  font-size: 12px;
  line-height: 1.35;
}

.pipeline-node small {
  color: var(--ink-600);
  font-family: var(--font-mono);
  font-size: 9px;
  line-height: 1.4;
}

.blueprint-result {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 16px;
  margin-top: 20px;
}

.mini-panel {
  padding: 14px;
  border: 1px solid var(--line-200);
  background: var(--paper-000);
}

.mini-panel strong {
  display: block;
  margin-bottom: 4px;
  font-size: 13px;
}

.mini-panel p {
  margin: 0;
  color: var(--ink-600);
  font-size: 12px;
  line-height: 1.65;
}

.trust-strip {
  border-bottom: 1px solid var(--line-200);
  background: var(--paper-000);
}

.trust-strip-inner {
  min-height: 76px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  align-items: center;
}

.trust-item {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 20px;
  font-size: 13px;
  font-weight: 600;
  text-align: center;
}

.trust-item + .trust-item {
  border-left: 1px solid var(--line-200);
}

.check-dot {
  width: 18px;
  height: 18px;
  display: inline-flex;
  flex: 0 0 18px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: var(--paper-000);
  background: var(--green-600);
  font-size: 11px;
  line-height: 1;
}

.section {
  padding-block: var(--section-space);
}

.section--tinted {
  border-block: 1px solid var(--line-200);
  background: var(--paper-050);
}

.section--blue {
  color: var(--paper-000);
  background: var(--ink-950);
}

.section-heading {
  max-width: 780px;
  margin-bottom: 46px;
}

.section-heading h2,
.tech-intro h2,
.case-copy h2 {
  margin: 12px 0 16px;
  font-size: clamp(32px, 4vw, 52px);
  letter-spacing: -0.045em;
  line-height: 1.25;
}

.section-heading p,
.tech-intro > p,
.case-copy > p {
  max-width: 720px;
  margin: 0;
  color: var(--ink-600);
  font-size: 17px;
}

.section--blue .section-heading p,
.section--blue .kicker {
  color: #b9ccd6;
}

.section--blue .architecture-stage {
  color: var(--ink-950);
}

.tech-overview {
  display: grid;
  grid-template-columns: minmax(280px, 0.75fr) minmax(0, 1.4fr);
  gap: 64px;
  align-items: start;
}

.spec-list,
.feature-list,
.plain-list {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.spec-list {
  counter-reset: spec;
}

.spec-list li {
  min-height: 54px;
  display: grid;
  grid-template-columns: 32px 1fr;
  align-items: start;
  gap: 12px;
  padding-block: 13px;
  border-bottom: 1px solid var(--line-200);
  counter-increment: spec;
  font-weight: 600;
}

.spec-list li::before {
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  content: counter(spec, decimal-leading-zero);
  color: var(--paper-000);
  background: var(--blue-600);
  font-family: var(--font-mono);
  font-size: 10px;
}

.architecture-panel {
  padding: 28px;
}

.architecture-flow {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 24px;
}

.architecture-stage {
  position: relative;
  min-height: 166px;
  padding: 18px 14px;
  border: 1px solid var(--line-300);
  background: var(--paper-000);
}

.architecture-stage:not(:last-child)::after {
  position: absolute;
  top: 50%;
  right: -19px;
  content: "→";
  color: var(--blue-600);
  font-family: var(--font-mono);
  transform: translateY(-50%);
}

.stage-number {
  color: var(--blue-600);
  font-family: var(--font-mono);
  font-size: 10px;
}

.architecture-stage h3 {
  margin: 24px 0 10px;
  font-size: 15px;
  line-height: 1.45;
}

.architecture-stage p {
  margin: 0;
  color: var(--ink-600);
  font-size: 12px;
  line-height: 1.7;
}

.architecture-base {
  margin-top: 20px;
  padding: 16px 18px;
  border: 1px solid var(--blue-600);
  color: var(--blue-700);
  background: var(--blue-050);
  font-size: 13px;
  font-weight: 600;
  text-align: center;
}

.capability-list {
  border-top: 1px solid var(--line-300);
}

.capability-row {
  display: grid;
  grid-template-columns: 180px minmax(230px, 0.8fr) minmax(0, 1.35fr) 160px;
  align-items: stretch;
  border-bottom: 1px solid var(--line-300);
}

.capability-row > * {
  padding: 28px 24px;
}

.capability-row > * + * {
  border-left: 1px solid var(--line-200);
}

.capability-number {
  color: var(--blue-600);
  font-family: var(--font-display);
  font-size: 50px;
  font-weight: 600;
  letter-spacing: -0.06em;
  line-height: 1;
}

.capability-copy h3 {
  margin: 0 0 10px;
  font-size: 21px;
}

.capability-copy p {
  margin: 0;
  color: var(--ink-600);
  font-size: 14px;
}

.micro-flow {
  display: flex;
  align-items: center;
  gap: 10px;
}

.micro-node {
  flex: 1 1 0;
  padding: 12px 8px;
  border: 1px solid var(--line-200);
  background: var(--paper-050);
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1.5;
  text-align: center;
}

.micro-arrow {
  color: var(--blue-600);
  font-family: var(--font-mono);
}

.row-link {
  align-self: center;
  color: var(--blue-700);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
}

.row-link:hover {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.case-feature {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(420px, 1.1fr);
  gap: 68px;
  align-items: start;
}

.case-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 28px;
}

.tag {
  display: inline-flex;
  padding: 5px 9px;
  border: 1px solid #9fd6c8;
  color: var(--green-600);
  background: var(--green-050);
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1.4;
}

.case-columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin-top: 32px;
}

.case-column {
  padding-top: 14px;
  border-top: 2px solid var(--blue-600);
}

.case-column h3 {
  margin: 0 0 10px;
  color: var(--blue-700);
  font-size: 13px;
}

.case-column p {
  margin: 0;
  color: var(--ink-600);
  font-size: 13px;
}

.answer-panel {
  overflow: hidden;
}

.answer-panel .panel-header {
  margin: 0;
  padding: 16px 18px;
  background: var(--paper-050);
}

.answer-body {
  padding: 24px;
}

.question {
  margin: 0 0 16px;
  font-weight: 600;
}

.answer {
  margin: 0;
  color: var(--ink-800);
}

.sources {
  display: grid;
  gap: 8px;
  margin-top: 24px;
}

.source-row {
  display: grid;
  grid-template-columns: 30px 1fr auto;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--line-200);
  background: var(--paper-000);
  font-family: var(--font-mono);
  font-size: 10px;
}

.source-index {
  color: var(--blue-600);
}

.page-hero {
  padding: 92px 0 72px;
  border-bottom: 1px solid var(--line-200);
  background: var(--paper-050);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
  color: var(--ink-600);
  font-family: var(--font-mono);
  font-size: 11px;
}

.breadcrumb a {
  text-decoration: none;
}

.page-lead {
  max-width: 760px;
  margin: 0;
  color: var(--ink-600);
  font-size: 18px;
}

.page-meta {
  margin: 18px 0 0;
  color: var(--ink-600);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
}

.toc-grid,
.case-grid,
.detail-grid,
.company-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.toc-card,
.case-card,
.detail-card {
  min-height: 260px;
  padding: 28px;
  border: 1px solid var(--line-300);
  background: var(--paper-000);
}

.toc-card:hover,
.case-card:hover {
  border-color: var(--blue-600);
}

.toc-card h2,
.case-card h2,
.detail-card h3 {
  margin: 34px 0 12px;
  font-size: 24px;
  line-height: 1.45;
}

.toc-card p,
.case-card p,
.detail-card p {
  margin: 0;
  color: var(--ink-600);
}

.toc-card a,
.case-card a {
  display: inline-flex;
  margin-top: 24px;
  color: var(--blue-700);
  font-weight: 700;
  text-decoration: none;
}

.case-card {
  min-height: 360px;
  display: flex;
  flex-direction: column;
}

.case-card .case-card-link {
  margin-top: auto;
  padding-top: 28px;
}

.case-card--primary {
  grid-column: 1 / -1;
  min-height: 380px;
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 48px;
}

.detail-card ul,
.case-card ul {
  margin: 18px 0 0;
  padding-left: 1.25em;
  color: var(--ink-600);
}

.detail-card li + li,
.case-card li + li {
  margin-top: 8px;
}

.split-section {
  display: grid;
  grid-template-columns: minmax(250px, 0.72fr) minmax(0, 1.28fr);
  gap: 72px;
  align-items: start;
}

.sticky-intro {
  position: sticky;
  top: 118px;
}

.stack-list {
  border-top: 1px solid var(--line-300);
}

.stack-item {
  display: grid;
  grid-template-columns: 74px 1fr;
  gap: 22px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line-200);
}

.stack-index {
  color: var(--blue-600);
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 600;
}

.stack-item h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.stack-item p {
  margin: 0;
  color: var(--ink-600);
}

.case-summary {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: 58px;
  margin-bottom: 64px;
  padding: 28px;
  border: 1px solid var(--line-300);
  background: var(--paper-050);
}

.case-summary dl,
.company-table {
  margin: 0;
}

.case-summary dt,
.company-row dt {
  color: var(--ink-600);
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
}

.case-summary dd {
  margin: 5px 0 18px;
  font-weight: 600;
}

.case-detail-section {
  padding: 42px 0;
  border-top: 1px solid var(--line-300);
}

.case-detail-section h2 {
  margin: 0 0 22px;
  font-size: 30px;
}

.case-detail-section p {
  max-width: 860px;
  color: var(--ink-600);
}

.company-table {
  border-top: 1px solid var(--line-300);
}

.company-row {
  display: grid;
  grid-template-columns: 210px 1fr;
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line-200);
}

.company-row dd {
  margin: 0;
}

.contact-panel {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 42px;
  align-items: center;
  padding: 46px;
  border: 1px solid var(--line-300);
  background: var(--paper-050);
}

.contact-panel h2 {
  margin: 0 0 10px;
  font-size: 30px;
}

.contact-panel p {
  margin: 0;
  color: var(--ink-600);
}

.site-footer {
  padding: 58px 0 28px;
  color: #d8e4e9;
  background: var(--ink-950);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr repeat(3, 0.7fr);
  gap: 40px;
}

.footer-brand .brand {
  color: var(--paper-000);
}

.footer-brand p {
  max-width: 300px;
  margin: 18px 0 0;
  color: #a9bec8;
  font-size: 13px;
}

.footer-column h2 {
  margin: 0 0 15px;
  color: var(--paper-000);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.footer-column a {
  display: block;
  padding: 5px 0;
  color: #b9ccd6;
  font-size: 13px;
  text-decoration: none;
}

.footer-column a:hover {
  color: var(--paper-000);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  margin-top: 48px;
  padding-top: 22px;
  border-top: 1px solid rgba(215, 225, 230, 0.18);
  color: #8ca5b1;
  font-family: var(--font-mono);
  font-size: 10px;
}

[data-reveal] {
  opacity: 1;
  transform: none;
}

[data-reveal].is-visible {
  animation: reveal-in 420ms ease both;
}

@keyframes reveal-in {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 1100px) {
  :root {
    --gutter: 24px;
    --section-space: 76px;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 42px;
  }

  .hero-copy {
    max-width: 760px;
  }

  .tech-overview,
  .case-feature {
    grid-template-columns: 1fr;
  }

  .architecture-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .architecture-stage:nth-child(3)::after {
    display: none;
  }

  .capability-row {
    grid-template-columns: 120px 0.9fr 1.2fr;
  }

  .capability-row .row-link {
    grid-column: 2 / -1;
    border-top: 1px solid var(--line-200);
    border-left: 1px solid var(--line-200);
  }
}

@media (max-width: 820px) {
  :root {
    --gutter: 20px;
    --section-space: 64px;
  }

  .brand-tagline {
    display: none;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: fixed;
    inset: 76px 0 auto;
    max-height: calc(100vh - 76px);
    display: grid;
    gap: 0;
    padding: 20px;
    border-bottom: 1px solid var(--line-300);
    background: var(--paper-000);
    box-shadow: 0 18px 32px rgba(11, 31, 45, 0.12);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-12px);
    transition: opacity 180ms ease, transform 180ms ease;
  }

  .site-nav.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .site-nav a {
    min-height: 52px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--line-200);
  }

  .site-nav a::after {
    display: none;
  }

  .site-nav .button {
    margin-top: 16px;
  }

  .hero-inner {
    min-height: auto;
    padding-block: 64px;
  }

  .pipeline {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .pipeline-node:not(:last-child)::after {
    display: none;
  }

  .trust-strip-inner,
  .case-columns,
  .toc-grid,
  .case-grid,
  .detail-grid,
  .company-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .trust-item {
    justify-content: flex-start;
  }

  .trust-item + .trust-item {
    border-top: 1px solid var(--line-200);
    border-left: 0;
  }

  .architecture-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .architecture-stage:nth-child(3)::after {
    display: block;
  }

  .architecture-stage:nth-child(2n)::after {
    display: none;
  }

  .capability-row {
    grid-template-columns: 92px 1fr;
  }

  .capability-row > * + * {
    border-left: 1px solid var(--line-200);
  }

  .capability-row .micro-flow,
  .capability-row .row-link {
    grid-column: 1 / -1;
    border-top: 1px solid var(--line-200);
    border-left: 0;
  }

  .case-card--primary,
  .split-section,
  .case-summary,
  .contact-panel {
    grid-template-columns: 1fr;
  }

  .case-card--primary {
    grid-column: auto;
  }

  .sticky-intro {
    position: static;
  }

  .footer-bottom {
    flex-direction: column;
  }
}

@media (max-width: 520px) {
  :root {
    --gutter: 18px;
    --section-space: 56px;
  }

  .header-inner {
    min-height: 68px;
  }

  .site-nav {
    inset: 68px 0 auto;
  }

  .hero h1,
  .page-hero h1 {
    font-size: 39px;
  }

  .hero-actions {
    display: grid;
  }

  .hero-actions .button {
    width: 100%;
  }

  .hero-blueprint,
  .architecture-panel,
  .answer-body,
  .toc-card,
  .case-card,
  .detail-card,
  .contact-panel {
    padding: 20px;
  }

  .pipeline,
  .architecture-flow,
  .blueprint-result {
    grid-template-columns: 1fr;
  }

  .architecture-stage::after {
    display: none !important;
  }

  .capability-row {
    grid-template-columns: 68px 1fr;
  }

  .capability-row > * {
    padding: 20px 14px;
  }

  .micro-flow {
    display: grid;
    grid-template-columns: 1fr;
  }

  .micro-arrow {
    transform: rotate(90deg);
    text-align: center;
  }

  .case-columns {
    gap: 18px;
  }

  .company-row {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .source-row {
    grid-template-columns: 24px 1fr;
  }

  .source-row > :last-child {
    grid-column: 2;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
    animation: none;
  }
}

@media (prefers-color-scheme: dark) {
  /* The approved V1 system remains light by design; controls still expose a dark-safe focus ring. */
  :root {
    color-scheme: light;
  }
}