:root {
  --bg: #0f172a;
  --card: #0b1223;
  --muted: #94a3b8;
  --text: #e2e8f0;
  --accent: #06b6d4;
  --border: #1e293b;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif;
  background: radial-gradient(1200px 600px at 20% 10%, rgba(34,211,238,0.15), transparent 60%),
              radial-gradient(1200px 600px at 80% 0%, rgba(6,182,212,0.15), transparent 60%),
              var(--bg);
  color: var(--text);
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 32px 16px 48px;
}

.header { text-align: center; margin-bottom: 28px; }
.header h1 { margin: 0 0 8px; font-size: 28px; }
.subtitle { margin: 0; color: var(--muted); }

.card {
  background: linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.02));
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px;
  margin-bottom: 16px;
  backdrop-filter: blur(6px);
}
.card h2 { margin: 0 0 12px; font-size: 18px; }
.card-header {
  display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
@media (max-width: 720px) {
  .grid { grid-template-columns: 1fr; }
}

.field { display: flex; flex-direction: column; gap: 6px; }
.field span { font-size: 13px; color: var(--muted); }
input[type="text"], select {
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #0a1121;
  color: var(--text);
  outline: none;
}
input[type="text"]:focus, select:focus {
  border-color: rgba(6,182,212,0.6);
  box-shadow: 0 0 0 3px rgba(6,182,212,0.15);
}

.checkbox { display: inline-flex; align-items: center; gap: 8px; margin-top: 10px; color: var(--muted); }
.checkbox input { accent-color: var(--accent); }

.hint { margin-top: 8px; color: var(--muted); font-size: 12px; }

.btn {
  background: linear-gradient(90deg, #06b6d4, #22d3ee);
  color: #001219;
  border: none;
  padding: 10px 14px;
  border-radius: 10px;
  font-weight: 600;
  cursor: pointer;
}
.btn:active { transform: translateY(1px); }

.preview {
  background: #0a1121;
  border: 1px dashed var(--border);
  border-radius: 12px;
  padding: 12px;
  overflow-x: auto;
}
.preview > div { background: #0b1223; padding: 8px; border-radius: 8px; }

.info { margin-top: 12px; color: var(--muted); }
.info h3 { margin: 0 0 6px; color: var(--text); font-size: 14px; }
.info ol { margin: 0 0 0 18px; padding: 0; }
.info li { margin: 4px 0; }

.footer { margin-top: 24px; text-align: center; color: var(--muted); }
.footer a { color: var(--accent); text-decoration: none; }