:root {
  --bg: #f7f8f5;
  --surface: #ffffff;
  --ink: #15191d;
  --muted: #5e6870;
  --line: #d8ded8;
  --green: #1f6f64;
  --green-dark: #174c46;
  --amber: #b46618;
  --blue: #315c8a;
  --red: #8e3f32;
  --code-bg: #111820;
  --code-ink: #edf5f1;
  --shadow: rgba(21, 25, 29, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  font-size: 16px;
  line-height: 1.6;
}

a {
  color: var(--green);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.16em;
}

a:hover {
  color: var(--green-dark);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: rgba(247, 248, 245, 0.94);
  backdrop-filter: blur(10px);
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 12px 24px;
}

.brand {
  color: var(--ink);
  font-weight: 750;
  text-decoration: none;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}

.nav a {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  border-radius: 8px;
  padding: 6px 10px;
  color: var(--ink);
  text-decoration: none;
}

.nav a:hover,
.nav a[aria-current="page"] {
  background: #e9efea;
  color: var(--green-dark);
}

.hero {
  min-height: 430px;
  color: white;
  background-color: #111820;
  background-image:
    linear-gradient(rgba(9, 16, 22, 0.64), rgba(9, 16, 22, 0.78)),
    url("https://rsasaki0109.github.io/CudaRobotics/gpu_mppi_racing.gif");
  background-position: center;
  background-size: cover;
}

.hero-inner,
.page-head,
.content,
.footer-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

.hero-inner {
  display: grid;
  align-content: center;
  min-height: 430px;
  padding-top: 42px;
  padding-bottom: 42px;
}

.eyebrow {
  margin: 0 0 10px;
  color: #c6efe3;
  font-size: 0.9rem;
  font-weight: 700;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.16;
}

h1 {
  max-width: 720px;
  font-size: 3.15rem;
}

.hero p {
  max-width: 760px;
  margin: 18px 0 0;
  color: #eef5f0;
  font-size: 1.15rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.button {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.84);
  border-radius: 8px;
  padding: 8px 14px;
  color: white;
  font-weight: 700;
  text-decoration: none;
}

.button:hover {
  background: white;
  color: var(--green-dark);
}

.button.primary {
  border-color: #c6efe3;
  background: #c6efe3;
  color: #10251f;
}

.button.primary:hover {
  background: white;
  color: #10251f;
}

.page-head {
  padding-top: 48px;
  padding-bottom: 22px;
}

.page-head p {
  max-width: 760px;
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 1.08rem;
}

.content {
  padding-bottom: 64px;
}

.section {
  margin-top: 30px;
}

.section + .section {
  margin-top: 44px;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 16px;
}

.section-head p {
  max-width: 640px;
  margin: 0;
  color: var(--muted);
}

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

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

.card {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 10px 24px var(--shadow);
  padding: 18px;
}

.card h3 {
  font-size: 1.14rem;
}

.card p,
.card ul,
.card ol {
  margin: 10px 0 0;
  color: var(--muted);
}

.card li + li {
  margin-top: 6px;
}

.tag {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 2px 8px;
  background: #f3f6f2;
  color: var(--green-dark);
  font-size: 0.86rem;
  font-weight: 700;
}

.tag.amber {
  color: var(--amber);
}

.tag.blue {
  color: var(--blue);
}

.tag.red {
  color: var(--red);
}

.code {
  overflow-x: auto;
  border-radius: 8px;
  background: var(--code-bg);
  color: var(--code-ink);
  padding: 16px;
}

pre {
  margin: 0;
}

code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.92em;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
  gap: 18px;
  align-items: start;
}

.media {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.media img {
  display: block;
  width: 100%;
  height: auto;
}

.media figcaption {
  padding: 10px 12px;
  color: var(--muted);
  font-size: 0.92rem;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: #edf2ed;
  font-size: 0.92rem;
}

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

.callout {
  border-left: 4px solid var(--green);
  border-radius: 8px;
  background: #eef5f0;
  padding: 14px 16px;
}

.callout p {
  margin: 0;
}

.footer {
  border-top: 1px solid var(--line);
  background: #eef2ed;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 14px;
  padding-top: 22px;
  padding-bottom: 22px;
  color: var(--muted);
}

.footer a {
  color: var(--green-dark);
}

@media (max-width: 900px) {
  .topbar-inner {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }

  .nav {
    justify-content: flex-start;
  }

  h1 {
    font-size: 2.35rem;
  }

  .grid,
  .grid.two,
  .split {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .topbar-inner,
  .hero-inner,
  .page-head,
  .content,
  .footer-inner {
    padding-left: 16px;
    padding-right: 16px;
  }

  .hero,
  .hero-inner {
    min-height: 390px;
  }

  h1 {
    font-size: 2rem;
  }

  .section-head {
    align-items: flex-start;
    flex-direction: column;
  }
}