/* Arthaa — landing site styles (shares the palette of the PhysicalAI mocks) */
:root {
  --bg: #0a0b0f;
  --panel: #13151c;
  --panel-2: #1a1d27;
  --border: #262a36;
  --text: #e6e8ee;
  --muted: #8b90a0;
  --accent: #6ee7b7;
  --accent-2: #818cf8;
  --accent-3: #fbbf24;
  --radius: 12px;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, system-ui, sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: radial-gradient(1200px 600px at 80% -10%, #18213a 0%, transparent 60%),
              radial-gradient(900px 500px at -10% 110%, #102a23 0%, transparent 55%),
              var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  min-height: 100vh;
}
a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Top bar */
.topbar {
  display: flex; align-items: center; gap: 18px;
  padding: 16px 28px; border-bottom: 1px solid var(--border);
  background: rgba(12,13,18,0.7); backdrop-filter: blur(8px);
  position: sticky; top: 0; z-index: 10;
}
.brand { font-weight: 700; letter-spacing: -0.02em; font-size: 18px; display: flex; align-items: center; gap: 10px; }
.brand .dot { width: 12px; height: 12px; border-radius: 50%; background: linear-gradient(135deg, var(--accent), var(--accent-2)); box-shadow: 0 0 16px var(--accent); }
.brand small { font-weight: 500; color: var(--muted); font-size: 12px; letter-spacing: 0.02em; }
.topbar .spacer { flex: 1; }
.nav { display: flex; gap: 6px; }
.nav a { padding: 7px 13px; border-radius: 8px; color: var(--muted); font-size: 14px; font-weight: 500; }
.nav a:hover { background: var(--panel-2); color: var(--text); text-decoration: none; }

/* Layout */
.wrap { max-width: 1060px; margin: 0 auto; padding: 56px 28px 96px; }
.kicker { color: var(--accent); font-weight: 600; font-size: 12.5px; text-transform: uppercase; letter-spacing: 0.12em; }
.hero h1 { font-size: clamp(30px, 5vw, 46px); letter-spacing: -0.03em; line-height: 1.08; margin: 14px 0 16px; max-width: 880px; }
.hero p.lede { font-size: 19px; color: var(--muted); max-width: 720px; margin: 0; }
.cta-row { display: flex; gap: 12px; margin-top: 28px; flex-wrap: wrap; }

.btn { display: inline-flex; align-items: center; gap: 8px; padding: 11px 18px; border-radius: 10px; font-weight: 600; font-size: 14.5px; border: 1px solid var(--border); background: var(--panel-2); color: var(--text); cursor: pointer; }
.btn.primary { background: linear-gradient(135deg, var(--accent-2), #6366f1); border-color: transparent; color: #0b0c14; }
.btn:hover { filter: brightness(1.08); text-decoration: none; }

.sectiontitle { font-size: 13px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); margin: 64px 0 18px; }

.grid { display: grid; gap: 18px; }
.cols-3 { grid-template-columns: repeat(3, 1fr); }
.cols-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 820px){ .cols-3, .cols-2 { grid-template-columns: 1fr; } }

.card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.card h3 { margin: 0 0 6px; font-size: 17px; letter-spacing: -0.01em; }
.card p { margin: 0; color: var(--muted); font-size: 14.5px; }
.card .num { font-family: var(--mono); font-size: 12px; color: var(--muted); }

/* Feature / venture spotlight */
.feature { display: grid; grid-template-columns: 1.1fr 1fr; gap: 28px; align-items: center;
  background: linear-gradient(180deg, var(--panel) 0%, #10131b 100%);
  border: 1px solid var(--border); border-radius: 16px; padding: 30px; }
@media (max-width: 820px){ .feature { grid-template-columns: 1fr; } }
.feature h2 { margin: 8px 0 10px; font-size: 26px; letter-spacing: -0.02em; }
.feature p { color: var(--muted); margin: 0 0 14px; }
.feature .visual { background: repeating-linear-gradient(45deg, #0c0e14, #0c0e14 12px, #0e1118 12px, #0e1118 24px);
  border: 1px solid var(--border); border-radius: 12px; min-height: 220px; display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden; }
.feature .visual .loop { display: flex; align-items: center; gap: 8px; font-family: var(--mono); font-size: 12.5px; color: var(--muted); flex-wrap: wrap; justify-content: center; padding: 16px; }
.feature .visual .loop b { color: var(--accent); }
.feature .visual .loop .arr { color: var(--accent-2); }

.tag { display: inline-block; font-size: 11.5px; font-weight: 600; padding: 4px 9px; border-radius: 6px; margin: 0 6px 6px 0;
  background: rgba(110,231,183,0.12); color: var(--accent); border: 1px solid rgba(110,231,183,0.25); }
.tag.indigo { background: rgba(129,140,248,0.12); color: var(--accent-2); border-color: rgba(129,140,248,0.25); }

footer { border-top: 1px solid var(--border); margin-top: 80px; padding: 32px 28px; color: var(--muted); font-size: 14px; }
footer .wrap-f { max-width: 1060px; margin: 0 auto; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.muted { color: var(--muted); }