:root {
  --bg: #ffffff;
  --panel: #f8fafc;
  --panel-strong: #f1f5f9;
  --text: #0f172a;
  --muted: #475569;
  --soft: #64748b;
  --line: #dbe3ee;
  --line-strong: #b8c4d4;
  --accent: #2563eb;
  --accent-soft: #eff6ff;
  --cyan-soft: #e0f2fe;
  --violet-soft: #f3e8ff;
  --green-soft: #dcfce7;
  --ok: #047857;
  --warning: #b45309;
  --code: #0b1220;
  --radius: 10px;
  --container: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  line-height: 1.55;
}

a {
  color: inherit;
  text-decoration: none;
}

code,
pre,
.mono {
  font-family:
    "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(14px);
}

.nav {
  max-width: var(--container);
  margin: 0 auto;
  min-height: 68px;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 720;
  letter-spacing: -0.02em;
}

.brand img {
  width: 140px;
  height: auto;
  display: block;
  object-fit: contain;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--muted);
  font-size: 13px;
}

.nav-links a:hover,
.nav-links a[aria-current="page"],
.nav-more summary:hover {
  color: var(--text);
}

.nav-more {
  position: relative;
}

.nav-more summary {
  list-style: none;
  cursor: pointer;
  color: var(--muted);
  user-select: none;
}

.nav-more summary::-webkit-details-marker {
  display: none;
}

.nav-more summary::after {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-left: 7px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: translateY(-2px) rotate(45deg);
}

.nav-more[open] summary,
.nav-more-active summary {
  color: var(--text);
}

.nav-more[open] summary::after {
  transform: translateY(1px) rotate(225deg);
}

.nav-dropdown {
  position: absolute;
  top: calc(100% + 16px);
  right: 0;
  z-index: 20;
  min-width: 220px;
  display: grid;
  gap: 4px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 18px 48px rgba(15, 23, 42, 0.12);
  padding: 8px;
}

.nav-dropdown a {
  border-radius: 8px;
  padding: 8px 10px;
  color: var(--muted);
}

.nav-dropdown a:hover,
.nav-dropdown a[aria-current="page"] {
  background: var(--panel);
  color: var(--text);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 8px 13px;
  color: var(--text);
  background: #fff;
}

.nav-cta img {
  width: 15px;
  height: 15px;
  display: block;
}

.nav-cta:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.section {
  border-bottom: 1px solid var(--line);
}

.section-muted {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 8% 14%, rgba(37, 99, 235, 0.10), transparent 28rem),
    radial-gradient(circle at 92% 82%, rgba(20, 184, 166, 0.08), transparent 26rem),
    linear-gradient(180deg, #f3f8ff 0%, #f8fafc 64%, #ffffff 100%);
}

.section-abstract {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 12% 20%, rgba(37, 99, 235, 0.14), transparent 25rem),
    radial-gradient(circle at 88% 8%, rgba(14, 165, 233, 0.12), transparent 23rem),
    radial-gradient(circle at 72% 82%, rgba(124, 58, 237, 0.08), transparent 24rem),
    linear-gradient(180deg, #ffffff, #f1f8ff 58%, #f8fafc);
}

.section-abstract::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.44;
  background-image:
    linear-gradient(rgba(37, 99, 235, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37, 99, 235, 0.08) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(180deg, transparent, #000 18%, #000 82%, transparent);
}

.section-abstract > .container {
  position: relative;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 88px 24px;
}

.hero {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.995) 0%, rgba(255, 255, 255, 0.98) 46%, rgba(255, 255, 255, 0.72) 70%, rgba(255, 255, 255, 0.32) 100%),
    url("assets/hero-runtime.webp"),
    linear-gradient(180deg, #e8f4ff 0%, #ffffff 74%);
  background-position: 66% center;
  background-size: cover;
}

.hero .container {
  position: relative;
  padding-top: 96px;
  padding-bottom: 78px;
}

.page-hero {
  background:
    radial-gradient(circle at 78% 18%, rgba(37, 99, 235, 0.16), transparent 28rem),
    radial-gradient(circle at 18% 12%, rgba(14, 165, 233, 0.12), transparent 24rem),
    linear-gradient(180deg, #f3f8ff 0%, #ffffff 82%);
}

.page-hero .container {
  padding-top: 78px;
  padding-bottom: 72px;
}

.page-hero h1 {
  max-width: 920px;
}

.page-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 28px;
  align-items: start;
}

.content-stack {
  display: grid;
  gap: 16px;
}

.number-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.86);
  padding: 20px;
}

.number-card .num {
  display: inline-flex;
  margin-bottom: 14px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.detail-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.detail-list li {
  border-bottom: 1px solid var(--line);
  padding-bottom: 12px;
  color: var(--muted);
}

.detail-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.link-card {
  display: block;
  min-height: 100%;
  transition: border-color 140ms ease, transform 140ms ease;
}

.link-card:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.mini-flow {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.mini-flow .diagram-box {
  min-height: 104px;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  letter-spacing: -0.035em;
  line-height: 1.08;
}

h1 {
  max-width: 880px;
  font-size: clamp(44px, 7vw, 82px);
  font-weight: 760;
}

h2 {
  font-size: clamp(30px, 4vw, 48px);
  font-weight: 730;
}

h3 {
  font-size: 20px;
  font-weight: 700;
}

.lead {
  max-width: 760px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: clamp(18px, 2vw, 22px);
}

.hero-actions {
  margin-top: 34px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 16px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  font-weight: 650;
  font-size: 14px;
}

.button.primary {
  background: var(--text);
  border-color: var(--text);
  color: #fff;
}

.button.primary:hover {
  background: var(--accent);
  border-color: var(--accent);
}

.button.secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.hero-grid {
  margin-top: 54px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.summary-card,
.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(10px);
}

.summary-card {
  padding: 20px;
}

.summary-card p,
.card p,
.section-intro,
.table-note {
  color: var(--muted);
}

.summary-card h3 {
  margin-bottom: 10px;
  font-size: 17px;
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1fr);
  gap: 48px;
  align-items: end;
  margin-bottom: 34px;
}

.section-intro {
  margin: 0;
  font-size: 17px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.card {
  padding: 22px;
}

.card h3 {
  margin-bottom: 10px;
}

.card p {
  margin: 0;
}

.demo-video-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #0b1220;
  box-shadow: 0 24px 70px rgba(15, 23, 42, 0.18);
}

.demo-video-card video {
  display: block;
  width: 100%;
  height: auto;
  background: #0b1220;
}

.a2ui-collage {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.a2ui-collage-main {
  grid-column: 1 / -1;
}

.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.screenshot-card {
  overflow: hidden;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #0b1220;
  box-shadow: 0 24px 70px rgba(15, 23, 42, 0.16);
}

.screenshot-card img {
  display: block;
  width: 100%;
  height: auto;
}

.screenshot-card figcaption {
  border-top: 1px solid rgba(148, 163, 184, 0.22);
  padding: 12px 14px;
  color: #cbd5e1;
  font-size: 13px;
}

@media (max-width: 720px) {
  .a2ui-collage {
    grid-template-columns: 1fr;
  }

  .a2ui-collage-main {
    grid-column: auto;
  }
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.tag {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 9px;
  color: var(--soft);
  background: var(--panel);
  font-size: 12px;
  font-weight: 600;
}

.diagram {
  border: 1px solid var(--line);
  border-radius: 14px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.86), rgba(248, 250, 252, 0.86));
  padding: 22px;
}

.diagram-row {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
  align-items: center;
}

.diagram-box {
  min-height: 82px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  padding: 14px;
}

.diagram-box strong {
  font-size: 14px;
}

.diagram-box span {
  color: var(--soft);
  font-size: 12px;
}

.diagram-arrow {
  color: var(--soft);
  text-align: center;
  font-weight: 700;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 22px;
  align-items: start;
}

.code-panel {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--code);
  color: #dbeafe;
}

.code-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 15px;
  border-bottom: 1px solid rgba(148, 163, 184, 0.28);
  color: #93c5fd;
  font-size: 12px;
}

pre {
  margin: 0;
  overflow: auto;
  padding: 18px;
  font-size: 13px;
  line-height: 1.7;
}

.code-note {
  margin: 0;
  padding: 0 18px 18px;
  color: #bfdbfe;
  font-size: 13px;
  line-height: 1.6;
}

.matrix {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 14px;
}

.matrix th,
.matrix td {
  border-bottom: 1px solid var(--line);
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
}

.matrix th {
  color: var(--soft);
  background: var(--panel);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.matrix tr:last-child td {
  border-bottom: 0;
}

.provider-showcase {
  margin-top: 22px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.provider-group {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.78);
  padding: 16px;
}

.provider-group h3 {
  margin-bottom: 12px;
  font-size: 15px;
  letter-spacing: 0;
}

.provider-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.provider-chip {
  min-height: 36px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  padding: 6px 10px;
  color: var(--text);
  font-size: 13px;
  font-weight: 650;
}

.provider-chip img {
  width: 18px;
  height: 18px;
  object-fit: contain;
  flex: 0 0 auto;
}

.provider-text-mark {
  font-family:
    "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  color: var(--muted);
}

.engine-section {
  display: grid;
  gap: 24px;
}

.engine-group {
  display: grid;
  grid-template-columns: minmax(0, 220px) minmax(0, 1fr);
  gap: 18px;
  align-items: start;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.84);
  padding: 18px;
}

.engine-group h3 {
  margin-bottom: 8px;
  font-size: 17px;
}

.engine-group p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.engine-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.engine-card {
  min-height: 88px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  padding: 12px;
}

.engine-card img {
  width: 34px;
  height: 34px;
  object-fit: contain;
}

.engine-card strong {
  font-size: 13px;
}

.engine-note {
  margin-top: 14px;
  color: var(--soft);
  font-size: 13px;
}

.flow-diagram {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.flow-diagram .diagram-box {
  min-height: 110px;
}

.flow-diagram-wide {
  grid-template-columns: repeat(6, minmax(0, 1fr));
}

.architecture-map {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background:
    linear-gradient(90deg, rgba(37, 99, 235, 0.08) 1px, transparent 1px),
    linear-gradient(rgba(37, 99, 235, 0.07) 1px, transparent 1px),
    linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(248, 250, 252, 0.88));
  background-size: 44px 44px;
  padding: 18px;
}

.architecture-lane {
  display: grid;
  gap: 10px;
  align-content: start;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.88);
  padding: 14px;
}

.architecture-lane > span {
  color: var(--accent);
  font-size: 12px;
  font-weight: 760;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.architecture-lane-core {
  border-color: rgba(37, 99, 235, 0.32);
  background: rgba(239, 246, 255, 0.9);
}

.architecture-node {
  min-height: 44px;
  display: flex;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: #fff;
  padding: 10px 12px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 650;
}

.architecture-node-strong {
  color: var(--text);
  border-color: rgba(37, 99, 235, 0.22);
}

.process-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.process-card {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.82);
  padding: 20px;
}

.process-card p {
  margin: 10px 0 18px;
  color: var(--muted);
}

.process-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.process-tags span {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  padding: 4px 9px;
  color: var(--soft);
  font-size: 12px;
  font-weight: 650;
}

.responsibility-matrix td:first-child {
  color: var(--text);
  font-weight: 750;
}

.callout {
  border: 1px solid #bfdbfe;
  border-radius: 14px;
  background:
    radial-gradient(circle at top right, rgba(37, 99, 235, 0.12), transparent 24rem),
    var(--accent-soft);
  padding: 22px;
}

.callout strong {
  color: #1d4ed8;
}

.privacy-document {
  max-width: 820px;
}

.privacy-document h1 {
  margin-bottom: 24px;
}

.privacy-document h2 {
  margin-top: 42px;
  margin-bottom: 12px;
  font-size: 24px;
  letter-spacing: -0.02em;
}

.privacy-document p {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 17px;
}

.privacy-document .lead {
  margin-bottom: 34px;
}

.site-footer {
  background: var(--text);
  color: #cbd5e1;
}

.site-footer .container {
  padding-top: 48px;
  padding-bottom: 48px;
  display: grid;
  grid-template-columns: minmax(220px, 1.2fr) repeat(4, minmax(120px, 1fr));
  gap: 32px;
  align-items: start;
}

.footer-brand {
  display: grid;
  gap: 12px;
}

.footer-logo {
  width: 150px;
  height: auto;
  display: block;
  filter: brightness(0) invert(1);
}

.footer-beta {
  display: inline-flex;
  width: max-content;
  border: 1px solid rgba(226, 232, 240, 0.24);
  border-radius: 999px;
  padding: 4px 9px;
  color: #e2e8f0;
  background: rgba(255, 255, 255, 0.06);
  font-size: 12px;
  font-weight: 700;
}

.footer-note {
  max-width: 280px;
  margin: 0;
  color: #94a3b8;
  font-size: 13px;
}

.footer-column {
  display: grid;
  gap: 9px;
}

.footer-column h3 {
  margin: 0 0 4px;
  color: #fff;
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.footer-links {
  display: contents;
  color: #e2e8f0;
  font-size: 14px;
}

.footer-column a {
  color: #cbd5e1;
  font-size: 14px;
}

.footer-column a:hover {
  color: #fff;
}

.footer-github {
  width: max-content;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
  border: 1px solid rgba(226, 232, 240, 0.26);
  border-radius: 999px;
  padding: 9px 13px;
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
  font-size: 15px;
  font-weight: 700;
}

.footer-github img {
  width: 18px;
  height: 18px;
  filter: brightness(0) invert(1);
}

.footer-github:hover {
  border-color: rgba(226, 232, 240, 0.52);
  background: rgba(255, 255, 255, 0.13);
}

.footer-column .footer-legal {
  margin-top: 2px;
  color: #94a3b8;
  font-size: 12px;
}

.footer-brand .footer-brand-legal {
  width: max-content;
  color: #94a3b8;
  font-size: 13px;
}

.footer-brand .footer-brand-legal:hover {
  color: #fff;
}

@media (max-width: 900px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding-top: 16px;
    padding-bottom: 16px;
  }

  .brand img {
    width: 128px;
  }

  .nav-links {
    flex-wrap: wrap;
  }

  .hero-grid,
  .feature-grid,
  .section-heading,
  .split,
  .provider-showcase,
  .page-grid,
  .mini-flow,
  .engine-group,
  .engine-list,
  .flow-diagram,
  .flow-diagram-wide,
  .architecture-map,
  .process-grid,
  .screenshot-grid,
  .diagram-row {
    grid-template-columns: 1fr;
  }

  .diagram-arrow {
    transform: rotate(90deg);
  }

  .container {
    padding-top: 62px;
    padding-bottom: 62px;
  }

  .site-footer .container {
    grid-template-columns: 1fr;
  }
}