:root {
  --green: #22c55e;
  --green-dark: #16a34a;
  --green-light: #bbf7d0;
  --bg: #0f172a;
  --bg-card: #1e293b;
  --bg-code: #334155;
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --text-heading: #f8fafc;
  --accent: #38bdf8;
  --border: #334155;
  --yellow: #facc15;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

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

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ─── Beta Banner ─────────────────────────────────── */
.beta-banner {
  background: linear-gradient(90deg, #422006, #713f12);
  color: var(--yellow);
  text-align: center;
  padding: 10px 24px;
  font-size: 0.85rem;
  font-weight: 500;
}

.beta-banner a {
  color: #fef08a;
  text-decoration: underline;
  margin-left: 4px;
}

.beta-tag {
  display: inline-block;
  background: var(--yellow);
  color: #000;
  font-size: 0.7rem;
  font-weight: 800;
  padding: 2px 8px;
  border-radius: 4px;
  margin-right: 8px;
  letter-spacing: 0.05em;
}

/* ─── Nav ─────────────────────────────────────────── */
nav {
  position: sticky;
  top: 0;
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  padding: 16px 0;
}

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

nav .logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-heading);
}

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

nav .links {
  display: flex;
  gap: 24px;
  list-style: none;
}

nav .links a {
  color: var(--text-muted);
  font-size: 0.9rem;
  transition: color 0.2s;
}

nav .links a:hover { color: var(--text-heading); text-decoration: none; }

/* ─── Hero ────────────────────────────────────────── */
.hero {
  padding: 60px 0 80px;
  text-align: center;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.hero h1 span { color: var(--green); }

.hero .tagline {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 auto 40px;
}

.hero .buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Mower animation */
.mower-scene {
  max-width: 700px;
  margin: 0 auto 32px;
}

.mower-svg {
  width: 100%;
  height: auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--green);
  color: #000;
}

.btn-primary:hover {
  background: var(--green-dark);
  text-decoration: none;
}

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

.btn-secondary:hover {
  background: var(--bg-code);
  text-decoration: none;
}

/* ─── How It Works ────────────────────────────────── */
.how-it-works {
  padding: 80px 0;
  background: linear-gradient(180deg, var(--bg) 0%, rgba(22, 163, 74, 0.05) 50%, var(--bg) 100%);
}

.how-it-works h2 {
  font-size: 2rem;
  color: var(--text-heading);
  text-align: center;
  margin-bottom: 48px;
}

.flow {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 16px;
}

.flow-step {
  flex: 1;
  max-width: 300px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  text-align: center;
}

.flow-step .flow-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
}

.flow-step h3 {
  font-size: 1.2rem;
  color: var(--text-heading);
  margin-bottom: 8px;
}

.flow-step p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.flow-arrow {
  font-size: 2rem;
  color: var(--green);
  padding-top: 60px;
  font-weight: 300;
}

/* ─── Features ────────────────────────────────────── */
.features {
  padding: 80px 0;
}

.features h2 {
  font-size: 2rem;
  color: var(--text-heading);
  text-align: center;
  margin-bottom: 48px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  transition: border-color 0.2s;
}

.feature-card:hover {
  border-color: var(--green);
}

.feature-card .icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.feature-card h3 {
  font-size: 1.1rem;
  color: var(--text-heading);
  margin-bottom: 8px;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ─── Architecture ────────────────────────────────── */
.architecture {
  padding: 80px 0;
}

.architecture h2 {
  font-size: 2rem;
  color: var(--text-heading);
  text-align: center;
  margin-bottom: 48px;
}

.arch-diagram {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.85rem;
  line-height: 1.5;
  overflow-x: auto;
  white-space: pre;
  color: var(--text-muted);
}

.arch-diagram .highlight { color: var(--green); font-weight: 600; }
.arch-diagram .accent { color: var(--accent); }

/* ─── Getting Started ─────────────────────────────── */
.getting-started {
  padding: 80px 0;
}

.getting-started h2 {
  font-size: 2rem;
  color: var(--text-heading);
  text-align: center;
  margin-bottom: 48px;
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.step {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  position: relative;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--green);
  color: #000;
  font-weight: 700;
  border-radius: 50%;
  margin-bottom: 16px;
}

.step h3 {
  color: var(--text-heading);
  margin-bottom: 8px;
}

.step p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 12px;
}

.step code {
  display: block;
  background: var(--bg-code);
  padding: 12px 16px;
  border-radius: 8px;
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.8rem;
  overflow-x: auto;
  white-space: pre;
}

/* ─── Tribute ─────────────────────────────────────── */
.tribute {
  padding: 80px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, var(--bg) 0%, rgba(56, 189, 248, 0.03) 50%, var(--bg) 100%);
}

.tribute h2 {
  font-size: 2rem;
  color: var(--text-heading);
  text-align: center;
  margin-bottom: 32px;
}

.tribute-text {
  color: var(--text-muted);
  max-width: 720px;
  margin: 0 auto 20px;
  text-align: center;
  font-size: 1.05rem;
  line-height: 1.8;
}

.tribute-text strong {
  color: var(--text-heading);
}

.tribute-text:last-child {
  margin-bottom: 0;
}

/* ─── Acknowledgments ─────────────────────────────── */
.acknowledgments {
  padding: 80px 0;
}

.acknowledgments h2 {
  font-size: 2rem;
  color: var(--text-heading);
  text-align: center;
  margin-bottom: 48px;
}

.thanks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.thanks-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  text-align: center;
  transition: border-color 0.2s;
}

.thanks-card:hover {
  border-color: var(--green);
}

.thanks-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.thanks-card h3 {
  color: var(--text-heading);
  font-size: 1rem;
  margin-bottom: 8px;
}

.thanks-card h3 a {
  color: var(--text-heading);
}

.thanks-card h3 a:hover {
  color: var(--green);
}

.thanks-card p {
  color: var(--text-muted);
  font-size: 0.85rem;
  line-height: 1.6;
}

/* ─── Community ───────────────────────────────────── */
.community {
  padding: 80px 0;
  text-align: center;
}

.community h2 {
  font-size: 2rem;
  color: var(--text-heading);
  margin-bottom: 16px;
}

.community p {
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto 32px;
}

.community .buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ─── Footer ──────────────────────────────────────── */
footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

footer a { color: var(--text-muted); }
footer a:hover { color: var(--text-heading); }

/* ─── Responsive ──────────────────────────────────── */
@media (max-width: 768px) {
  .flow {
    flex-direction: column;
    align-items: center;
  }
  .flow-arrow {
    transform: rotate(90deg);
    padding-top: 0;
  }
  .flow-step {
    max-width: 100%;
  }
}

@media (max-width: 640px) {
  .hero h1 { font-size: 2.25rem; }
  .hero .tagline { font-size: 1rem; }
  .hero { padding: 40px 0; }
  .mower-scene { margin-bottom: 16px; }
  .features, .architecture, .getting-started, .how-it-works, .tribute, .community { padding: 48px 0; }
  nav .links { gap: 12px; font-size: 0.8rem; }
}