:root {
  color-scheme: dark;
  --bg: #08110d;
  --panel: #101d17;
  --panel-2: #162820;
  --text: #f3f8f5;
  --muted: #a9b9b0;
  --line: #284338;
  --accent: #8fd8b2;
  --accent-strong: #5cc891;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at 50% 0%, #1c352b 0%, var(--bg) 44rem);
  color: var(--text);
}

a {
  color: inherit;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem clamp(1rem, 4vw, 4rem);
  border-bottom: 1px solid rgba(143, 216, 178, 0.18);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 800;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  position: relative;
  width: 2.4rem;
  height: 2.4rem;
  place-items: center;
  overflow: hidden;
  border-radius: 0.6rem;
  border: 1px solid rgba(143, 216, 178, 0.22);
  background: linear-gradient(145deg, #18241f, #08110d 68%);
  color: #f7fbf8;
  font-size: 0.8rem;
  font-weight: 900;
  letter-spacing: 0;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08), 0 0.45rem 1rem rgba(0, 0, 0, 0.22);
}

.brand-mark::after {
  content: "";
  position: absolute;
  right: 0.34rem;
  top: 1.06rem;
  width: 0.92rem;
  height: 0.32rem;
  border-radius: 999px;
  background: linear-gradient(90deg, #f3fff9, var(--accent-strong));
}

nav {
  display: flex;
  gap: 1rem;
  color: var(--muted);
  font-size: 0.95rem;
}

nav a,
footer a {
  text-decoration: none;
}

nav a:hover,
footer a:hover {
  color: var(--accent);
}

.hero {
  display: grid;
  min-height: 70vh;
  align-items: center;
  padding: clamp(3rem, 7vw, 7rem) clamp(1rem, 4vw, 4rem);
}

.hero > div,
.page {
  width: min(960px, 100%);
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--accent);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
}

h1 {
  margin: 0;
  max-width: 760px;
  font-size: clamp(2.6rem, 8vw, 5.6rem);
  line-height: 0.95;
  letter-spacing: 0;
}

h2 {
  margin: 0 0 0.75rem;
  font-size: 1.25rem;
}

h3 {
  margin: 1.4rem 0 0.4rem;
  color: var(--accent);
  font-size: 1rem;
}

p {
  line-height: 1.65;
}

.lead {
  max-width: 720px;
  color: var(--muted);
  font-size: 1.2rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  min-height: 3rem;
  padding: 0 1.1rem;
  border-radius: 0.45rem;
  background: var(--accent);
  color: #08110d;
  font-weight: 800;
  text-decoration: none;
}

.button.secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line);
}

.features {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  padding: 0 clamp(1rem, 4vw, 4rem) 4rem;
}

.features article,
.contact-panel,
.content-list {
  background: rgba(16, 29, 23, 0.86);
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  padding: 1.4rem;
}

.features p,
.content-list p,
.updated {
  color: var(--muted);
}

.page {
  margin: 0 auto;
  padding: clamp(2.5rem, 6vw, 5rem) 1rem;
}

.page h1 {
  font-size: clamp(2.4rem, 6vw, 4.5rem);
  margin-bottom: 1rem;
}

.contact-panel {
  margin: 2rem 0;
}

.contact-panel a {
  color: var(--accent);
  font-weight: 800;
}

.content-list {
  margin-top: 1.5rem;
}

.content-list h2:not(:first-child) {
  margin-top: 2rem;
}

.content-list a {
  color: var(--accent);
}

.tutorial-video {
  margin: 1rem 0 1.8rem;
}

.tutorial-video video {
  display: block;
  width: min(30%, 340px);
  min-width: 180px;
  aspect-ratio: 9 / 16;
  transition: width 220ms ease, box-shadow 220ms ease;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: #020504;
  box-shadow: 0 1rem 2.5rem rgba(0, 0, 0, 0.24);
}

.tutorial-video.is-expanded video {
  width: min(420px, 100%);
  box-shadow: 0 1.25rem 3rem rgba(0, 0, 0, 0.34);
}

.tutorial-video figcaption {
  margin-top: 0.65rem;
  color: var(--muted);
  font-size: 0.95rem;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem clamp(1rem, 4vw, 4rem);
  color: var(--muted);
  border-top: 1px solid rgba(143, 216, 178, 0.18);
}

@media (max-width: 720px) {
  .site-header,
  footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .features {
    grid-template-columns: 1fr;
  }

  .tutorial-video video,
  .tutorial-video.is-expanded video {
    width: min(100%, 340px);
  }
}