:root {
  color-scheme: dark;
  --bg-a: #0b1a2f;
  --bg-b: #132c44;
  --panel: rgba(10, 18, 30, 0.72);
  --line: rgba(255, 255, 255, 0.12);
  --text: #f2f7ff;
  --muted: #9eb3c8;
  --accent: #4cc9f0;
  --warn: #ff6b6b;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  font-family: 'Avenir Next', 'Segoe UI', sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 20% 15%, #173b63 0%, var(--bg-a) 45%, var(--bg-b) 100%);
}

a {
  color: var(--accent);
}

.panel {
  border: 1px solid var(--line);
  background: var(--panel);
  backdrop-filter: blur(8px);
  border-radius: 16px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

button,
input {
  font: inherit;
}

button {
  border: 0;
  border-radius: 12px;
  background: linear-gradient(130deg, #4cc9f0, #06d6a0);
  color: #072031;
  padding: 0.8rem 1rem;
  font-weight: 700;
}

button:disabled {
  opacity: 0.5;
}

input[type='text'] {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.65rem 0.8rem;
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}