:root {
  --bg: #0c1117;
  --bg-card: #151b24;
  --border: #243044;
  --text: #e8edf5;
  --muted: #8b9bb4;
  --accent: #3d9cf0;
  --accent-soft: rgba(61, 156, 240, 0.12);
  --warm: #f0a050;
  --green: #4ade80;
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --mono: "SF Mono", "Fira Code", ui-monospace, monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  text-decoration: underline;
}

.container {
  width: min(1080px, 92vw);
  margin: 0 auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(12, 17, 23, 0.85);
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 0;
}

.logo {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
  text-decoration: none;
}

.logo span {
  color: var(--accent);
}

.nav {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.nav a {
  color: var(--muted);
  font-size: 0.92rem;
  text-decoration: none;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.65rem 1.25rem;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.15s, box-shadow 0.15s;
}

.btn:hover {
  transform: translateY(-1px);
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, #3d9cf0, #2563eb);
  color: #fff;
  box-shadow: 0 4px 20px rgba(61, 156, 240, 0.35);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-sm {
  padding: 0.45rem 0.9rem;
  font-size: 0.85rem;
}

/* Hero */
.hero {
  padding: 5rem 0 4rem;
  text-align: center;
  background:
    radial-gradient(ellipse 80% 60% at 50% -10%, rgba(61, 156, 240, 0.18), transparent),
    radial-gradient(ellipse 50% 40% at 80% 50%, rgba(240, 160, 80, 0.08), transparent);
}

.hero-badge {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  border: 1px solid rgba(61, 156, 240, 0.25);
}

.hero h1 {
  font-size: clamp(1.85rem, 5vw, 2.75rem);
  line-height: 1.25;
  margin: 0 0 1rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.hero .subtitle {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  color: var(--muted);
  max-width: 640px;
  margin: 0 auto 2rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.hero-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
}

.tag {
  padding: 0.25rem 0.65rem;
  border-radius: 6px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.78rem;
}

/* Pipeline */
section {
  padding: 4rem 0;
}

section h2 {
  font-size: 1.65rem;
  margin: 0 0 0.5rem;
  text-align: center;
}

.section-desc {
  text-align: center;
  color: var(--muted);
  margin: 0 auto 2.5rem;
  max-width: 560px;
}

.pipeline {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
}

.step {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  text-align: center;
  position: relative;
}

.step-num {
  display: inline-flex;
  width: 2rem;
  height: 2rem;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
  font-size: 0.85rem;
  margin-bottom: 0.75rem;
}

.step h3 {
  margin: 0 0 0.4rem;
  font-size: 1rem;
}

.step p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
}

/* Features grid */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
}

.feature-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
}

.feature-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.feature-card .icon {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

/* Use cases */
.use-cases {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.use-case {
  padding: 1.25rem;
  border-left: 3px solid var(--accent);
  background: var(--bg-card);
  border-radius: 0 12px 12px 0;
}

.use-case h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
}

.use-case p {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

/* Code block */
.quickstart {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.quickstart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.25rem;
  background: rgba(0, 0, 0, 0.25);
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--muted);
}

pre {
  margin: 0;
  padding: 1.25rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.6;
  color: #c9d6e8;
}

code .comment {
  color: #6b7d96;
}

code .cmd {
  color: var(--green);
}

/* Deps table */
.deps-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.deps-table th,
.deps-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.deps-table th {
  color: var(--muted);
  font-weight: 600;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.deps-table tr:last-child td {
  border-bottom: none;
}

.deps-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

/* Footer */
.site-footer {
  padding: 2.5rem 0;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--muted);
  font-size: 0.88rem;
}

.site-footer p {
  margin: 0.35rem 0;
}

@media (max-width: 640px) {
  .nav a:not(.btn) {
    display: none;
  }

  .hero {
    padding: 3rem 0 2.5rem;
  }
}