:root {
  --bg: #0b1020;
  --bg2: #131b33;
  --card: rgba(19, 27, 51, 0.82);
  --text: #e8eeff;
  --muted: #adc0ef;
  --accent: #6ee7ff;
  --accent2: #7cf29f;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color: var(--text);
  background: radial-gradient(1200px 700px at 20% -10%, #243a70 0%, transparent 55%),
              radial-gradient(1000px 700px at 100% 0%, #1b5c6a 0%, transparent 45%),
              linear-gradient(180deg, var(--bg2), var(--bg));
  min-height: 100vh;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 22px;
  border-bottom: 1px solid #2c3d70;
  background: rgba(7, 12, 24, 0.55);
  backdrop-filter: blur(8px);
}
.brand { font-weight: 800; letter-spacing: .2px; }
nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 14px;
  font-weight: 600;
}
nav a:hover { color: var(--accent); }

.app {
  max-width: 1100px;
  margin: 22px auto;
  padding: 0 16px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.panel {
  background: var(--card);
  border: 1px solid #30457f;
  border-radius: 18px;
  padding: 18px;
  box-shadow: 0 20px 45px rgba(0,0,0,.28);
}

h1 { margin: 0 0 8px 0; }
.muted { color: var(--muted); }

.grid {
  margin-top: 14px;
  display: grid;
  grid-template-columns: 140px 1fr auto;
  gap: 10px;
  align-items: center;
}

input {
  width: 100%;
  border: 1px solid #35519a;
  background: #0f1730;
  color: var(--text);
  border-radius: 12px;
  padding: 11px 12px;
}

button, .button {
  border: none;
  background: linear-gradient(120deg, var(--accent), var(--accent2));
  color: #05202b;
  border-radius: 12px;
  font-weight: 800;
  padding: 11px 14px;
  cursor: pointer;
  text-decoration: none;
}

.actions { margin-top: 12px; }
.preview canvas {
  width: 100%;
  max-width: 900px;
  border: 1px solid #35519a;
  border-radius: 14px;
  background: #081024;
}

footer {
  max-width: 1100px;
  margin: 10px auto 28px auto;
  padding: 0 16px;
  color: #9bb2e8;
  font-size: .92rem;
}

.card {
  max-width: 900px;
  margin: 22px auto;
  padding: 18px;
  background: var(--card);
  border: 1px solid #30457f;
  border-radius: 16px;
}

@media (max-width: 840px) {
  .grid { grid-template-columns: 1fr; }
  .grid label { margin-top: 8px; }
}