:root {
  --bg: #0f1724;
  --card: #0b1220;
  --muted: #9aa8bf;
  --primary: #1e90ff;
  --primary-600: #1580e6;
  --accent: #00b7ff;
  --glass: rgba(255, 255, 255, 0.04);
  --radius: 12px;
  --max-width: 1100px;
}

/* Reset & base */
* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
  padding: 0;
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  background: linear-gradient(180deg, var(--bg) 0%, #071026 100%);
  color: #e6f0ff;
}

.container {
  max-width: var(--max-width);
  margin: 2rem auto;
  padding: 1.25rem;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0.01));
  border-radius: 12px;
  box-shadow: 0 6px 20px rgba(2, 6, 23, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.03);
}

.box {
  width: 200px;
  height: 200px;
  margin: 2rem auto;
  background: linear-gradient(135deg, #1a3a5c, #0b1f2d);
  border-radius: 16px;
  border: 2px solid rgba(255, 255, 255, 0.06);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: transparent;
  transition: all 0.2s ease;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(2, 6, 23, 0.5);
}



button {
  display: inline-block;
  background: linear-gradient(90deg, var(--primary), var(--primary-600));
  color: #fff;
  padding: 0.7rem 1.2rem;
  border-radius: 10px;
  font-weight: 700;
  border: none;
  cursor: pointer;
  box-shadow: 0 6px 18px rgba(30, 144, 255, 0.14);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}