:root {
  --bg: #ffffff;
  --bg-alt: #f5f7fa;
  --bg-panel: #ffffff;
  --text: #1d2127;
  --text-dim: #5b6370;
  --border: #d9e1e8;
  --accent: #2563eb;
  --accent-accent: #1d4ed8;
  --radius: 10px;
  --shadow: 0 3px 8px -2px rgba(0, 0, 0, 0.08), 0 0 0 1px rgba(0, 0, 0, 0.04);
  --code: "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
  --trans: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

html[data-theme="dark"] {
  --bg: #0f141a;
  --bg-alt: #141b23;
  --bg-panel: #1b2430;
  --text: #e6edf3;
  --text-dim: #97a3b3;
  --border: #2a3542;
  --accent: #4093ff;
  --accent-accent: #1f6fd3;
  --shadow: 0 4px 14px -4px rgba(0, 0, 0, 0.6),
    0 0 0 1px rgba(255, 255, 255, 0.04);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 0.85rem clamp(1rem, 3vw, 3rem);
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(10px);
  box-shadow: 0 1px 0 var(--border);
}
html[data-theme="dark"] .site-header {
  background: rgba(16, 21, 28, 0.7);
}

.logo {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.version-badge {
  font-size: 0.65rem;
  background: var(--accent);
  color: #fff;
  padding: 0.25rem 0.5rem;
  border-radius: 20px;
  letter-spacing: 0.5px;
  font-weight: 600;
  text-transform: uppercase;
}

.top-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.top-nav a {
  padding: 0.35rem 0.75rem;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-dim);
  transition: var(--trans);
}
.top-nav a:hover {
  background: var(--bg-alt);
  color: var(--text);
  text-decoration: none;
}
html[data-theme="dark"] .top-nav a:hover {
  background: #223040;
}

.theme-toggle {
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--bg-panel);
  color: var(--text);
  padding: 0.45rem 0.7rem;
  border-radius: 8px;
  font-size: 1rem;
  display: flex;
  gap: 0.4rem;
  align-items: center;
  transition: var(--trans);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.06);
}
.theme-toggle:hover {
  background: var(--bg-alt);
}

.theme-toggle .icon-dark {
  display: none;
}
html[data-theme="dark"] .theme-toggle .icon-light {
  display: none;
}
html[data-theme="dark"] .theme-toggle .icon-dark {
  display: inline;
}

.hero {
  padding: clamp(3rem, 8vw, 6rem) clamp(1rem, 3vw, 3rem) 2rem;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}
.hero h2 {
  margin: 0 0 1rem;
  font-size: clamp(2rem, 6vw, 3rem);
  letter-spacing: 0.5px;
}
.tagline {
  margin: 0 auto 1.2rem;
  max-width: 650px;
  font-size: 1.05rem;
  color: var(--text-dim);
}
.cta-row {
  display: flex;
  gap: 0.9rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 1rem;
}
.btn {
  --btn-bg: var(--bg-panel);
  --btn-color: var(--text);
  --btn-border: var(--border);
  border: 1px solid var(--btn-border);
  background: var(--btn-bg);
  color: var(--btn-color);
  padding: 0.75rem 1.1rem;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 10px;
  letter-spacing: 0.5px;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
  transition: var(--trans);
  text-decoration: none;
}
.btn:hover {
  background: var(--bg-alt);
  text-decoration: none;
}
.btn.primary {
  --btn-bg: var(--accent);
  --btn-color: #fff;
  --btn-border: var(--accent);
}
.btn.primary:hover {
  background: var(--accent-accent);
}

main {
  padding: 0 0 4rem;
}

.panel {
  max-width: 960px;
  margin: 0 auto;
  padding: 2.5rem clamp(1rem, 3vw, 3rem);
}

.panel h3 {
  margin: 0 0 1.1rem;
  font-size: 1.35rem;
  letter-spacing: 0.3px;
}

.demo-wrapper {
  position: relative;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--bg-panel);
  padding: 1rem;
  box-shadow: var(--shadow);
  min-height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.demo-gif {
  max-width: 100%;
  border-radius: 10px;
  box-shadow: 0 4px 18px -6px rgba(0, 0, 0, 0.25);
  transition: opacity 0.6s ease;
  display: block;
}

.loader {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  justify-content: center;
  background: linear-gradient(120deg, var(--bg-alt), var(--bg-panel));
  border-radius: 14px;
  animation: subtleFade 0.8s ease;
}
@keyframes subtleFade {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.spinner {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 4px solid var(--border);
  border-top-color: var(--accent);
  animation: spin 1s linear infinite;
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.feature-list,
.steps {
  margin: 0;
  padding-left: 1.1rem;
  line-height: 1.6;
  font-size: 0.95rem;
}
.feature-list li + li,
.steps li + li {
  margin-top: 0.2rem;
}

.grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
}
.cmd {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  padding: 0.9rem 0.9rem 0.8rem;
  border-radius: 12px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  transition: var(--trans);
  font-size: 0.75rem;
}
.cmd:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 22px -8px rgba(0, 0, 0, 0.3), 0 0 0 1px var(--border);
}
.cmd code {
  font-family: var(--code);
  font-size: 0.75rem;
  padding: 0.2rem 0.45rem;
  background: var(--bg-alt);
  border-radius: 6px;
  letter-spacing: 0.5px;
  font-weight: 600;
  display: inline-block;
}

.minimal p {
  margin: 0;
  color: var(--text-dim);
  max-width: 720px;
  font-size: 0.95rem;
}

.site-footer {
  text-align: center;
  padding: 3rem 1rem 4rem;
  font-size: 0.75rem;
  color: var(--text-dim);
}
.site-footer a {
  color: inherit;
  text-decoration: underline;
}
.site-footer a:hover {
  color: var(--accent);
}

@media (max-width: 680px) {
  .top-nav a {
    display: none;
  }
  .top-nav {
    gap: 0.4rem;
  }
  .logo {
    font-size: 1rem;
  }
  .panel {
    padding: 2rem 1.25rem;
  }
  .hero {
    padding: 3.5rem 1.1rem 2rem;
  }
  .cmd {
    font-size: 0.7rem;
  }
}