:root {
  --bg: #0b0d10;
  --panel: #141a20;
  --line: #2a3440;
  --text: #e6ebf2;
  --muted: #97a3b3;
  --accent: #5ad1ff;
  --accent-ink: #001e2a;
  --cta-bg: #3e9fc7;
  --cta-border: #56b2d8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Noto Sans", "Helvetica Neue", Arial, sans-serif;
  background: radial-gradient(1200px 600px at 15% -10%, #152231 0%, var(--bg) 45%);
  color: var(--text);
  line-height: 1.55;
}

html {
  scroll-padding-top: 84px;
}

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

.header {
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(11, 13, 16, 0.75);
}

.header-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 0.9rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.9rem;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.brand-logo {
  width: 22px;
  height: 22px;
  border-radius: 8px;
  border: 1px solid var(--line);
}

.brand-text {
  color: var(--text);
  font-weight: 700;
  letter-spacing: 0.01em;
  font-size: 1.15rem;
}

.top-nav {
  display: flex;
  align-items: center;
  gap: 0.95rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.top-nav-link {
  padding: 0.1rem 0;
  border: 0;
  border-bottom: 1px solid transparent;
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 600;
}

.top-nav-link:hover {
  color: var(--text);
  border-bottom-color: var(--accent);
}

.top-nav-link-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-left: 0.2rem;
  padding: 0.33rem 0.65rem;
  border: 1px solid var(--line);
  border-radius: 7px;
}

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

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 2.25rem 1rem 3.5rem;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2rem, 5.2vw, 3.5rem);
  line-height: 1.05;
}

.hero-title {
  margin-top: 0.35rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.logo {
  width: 54px;
  height: 54px;
  border-radius: 12px;
  object-fit: cover;
  border: 1px solid var(--line);
}

.subtitle {
  margin: 0.75rem 0 0;
  color: var(--text);
  font-size: clamp(1.05rem, 2.3vw, 1.35rem);
}

.intro {
  margin: 0.8rem 0 0;
  color: var(--muted);
  max-width: 70ch;
}

.hero-actions {
  margin-top: 1.1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.hero-meta {
  margin: 0.9rem 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.hero-meta li {
  padding: 0.2rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.78rem;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.6rem 0.95rem;
  border: 1px solid var(--cta-border);
  border-radius: 7px;
  background: var(--cta-bg);
  color: var(--accent-ink);
  font-weight: 700;
}

.button-ghost {
  border-color: var(--line);
  color: var(--text);
  background: transparent;
}

.section {
  margin-top: 1.55rem;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: linear-gradient(160deg, rgba(20, 26, 32, 0.95), rgba(15, 19, 25, 0.88));
}

.section[id] {
  scroll-margin-top: 84px;
}

.hero + .section {
  margin-top: 1.1rem;
}

.section h2 {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin: 0 0 0.8rem;
  font-size: 1rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.section-copy {
  margin: 0 0 0.75rem;
  color: var(--muted);
}

.inline-link {
  color: var(--text);
  border-bottom: 1px solid var(--line);
}

.inline-link:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.feature-list,
.flow {
  margin: 0;
  padding-left: 1.15rem;
}

.feature-list li + li,
.flow li + li {
  margin-top: 0.5rem;
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9rem;
}

.feature-grid,
.docs-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.7rem;
}

.tab-button {
  padding: 0.35rem 0.65rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.8rem;
}

.tab-button.is-active {
  border-color: var(--accent);
  color: var(--text);
  background: rgba(90, 209, 255, 0.12);
}

.tab-panel {
  display: none;
}

.tab-panel.is-active {
  display: block;
}

.feature-card,
.doc-card {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.85rem;
  background: rgba(10, 17, 24, 0.7);
}

.feature-card h3,
.doc-card h3 {
  margin: 0;
  font-size: 0.95rem;
}

.feature-card p,
.doc-card p {
  margin: 0.45rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.doc-card:hover {
  border-color: var(--accent);
}

.architecture {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 0.55rem;
  margin-bottom: 0.85rem;
  align-items: stretch;
}

.arch-node {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.7rem;
  background: rgba(10, 17, 24, 0.7);
}

.arch-node h3 {
  margin: 0;
  font-size: 0.9rem;
}

.arch-node p {
  margin: 0.45rem 0 0;
  color: var(--muted);
  font-size: 0.84rem;
}

.arch-arrow {
  align-self: center;
  color: var(--accent);
  font-weight: 700;
}

.subheading {
  margin: 0 0 0.55rem;
  color: var(--text);
  font-size: 0.9rem;
  letter-spacing: 0.02em;
}

.code-wrap {
  position: relative;
}

.code-wrap + .subheading {
  margin-top: 0.95rem;
}

pre {
  margin: 0;
  padding: 0.8rem;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #0a1118;
  overflow-x: auto;
}

.copy-btn {
  position: absolute;
  top: 0.55rem;
  right: 0.55rem;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.45rem;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #101922;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.72rem;
}

.copy-btn:hover {
  border-color: var(--accent);
  color: var(--text);
}

.copy-icon {
  width: 13px;
  height: 13px;
  fill: currentColor;
}

.copy-btn.copied {
  border-color: #20c997;
  color: #20c997;
}

code {
  font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  color: #c8efff;
  font-size: 0.9rem;
}

.icon {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
  filter: invert(1);
  opacity: 0.88;
}

.button:not(.button-ghost) .icon {
  filter: none;
  opacity: 1;
}

.compose-block {
  margin-top: 0.7rem;
}

@media (max-width: 760px) {
  .header-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .top-nav {
    width: 100%;
    justify-content: flex-start;
  }

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

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

  .arch-arrow {
    justify-self: center;
    transform: rotate(90deg);
  }

  .feature-grid,
  .docs-grid {
    grid-template-columns: 1fr;
  }

  .logo {
    width: 46px;
    height: 46px;
  }
}