:root {
  --bg: #0b0d12;
  --bg-soft: #131722;
  --panel: #161b28;
  --border: #232a3b;
  --text: #e6e9f0;
  --muted: #9aa3b5;
  --accent: #5b8cff;
  --accent-strong: #3f74ff;
  --code: #0e1219;
  --radius: 10px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

.topbar {
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.brand {
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.02em;
  color: var(--text);
  text-decoration: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
}

.nav-links a:hover {
  color: var(--text);
}

.nav-cta {
  color: var(--text) !important;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 12px;
}

main {
  padding: 48px 0 96px;
}

h1 {
  font-size: 40px;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin: 0 0 16px;
}

h2 {
  font-size: 24px;
  letter-spacing: -0.02em;
  margin: 40px 0 12px;
}

h3 {
  font-size: 17px;
  margin: 0 0 8px;
}

p {
  color: var(--text);
}

.muted {
  color: var(--muted);
}

.hero {
  max-width: 720px;
  padding: 48px 0 24px;
}

.hero p {
  color: var(--muted);
  font-size: 18px;
  max-width: 640px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  margin-top: 24px;
}

.btn {
  display: inline-block;
  background: var(--accent-strong);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 10px 18px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}

.btn:hover {
  background: var(--accent);
}

.btn-ghost {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  border-color: var(--accent);
  background: var(--panel);
}

.code-block,
pre {
  background: var(--code);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  overflow-x: auto;
  font-size: 13.5px;
}

pre code,
code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-top: 40px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.card p {
  color: var(--muted);
  margin: 0;
  font-size: 14.5px;
}

.interfaces {
  margin-top: 40px;
}

.interfaces-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

a {
  color: var(--accent);
}

.footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  color: var(--muted);
  font-size: 13px;
}

/* Playground */
.playground {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.pg-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.pg-row select,
.pg-row input,
.pg-config input {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 10px 12px;
  font-size: 15px;
}

.pg-row input {
  flex: 1;
  min-width: 220px;
}

.pg-config {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.pg-config label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
  color: var(--muted);
  flex: 1;
  min-width: 200px;
}

.pg-output {
  min-height: 220px;
  white-space: pre-wrap;
  word-break: break-word;
}