:root { --bg: #0b0a10; --card: #110f17; --text: #ece9f5; --muted: #9690a8; --border: #2a2536; --accent: #8b5cf6; }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; color: var(--text); color-scheme: dark; padding: 16px;
  font: 15px/1.5 "Inter", "Segoe UI Variable", "Segoe UI", system-ui, -apple-system, sans-serif;
  background: radial-gradient(700px 420px at 50% 20%, rgba(139, 92, 246, .18), transparent 70%), var(--bg); }
.card { width: 100%; max-width: 360px; background: var(--card); border: 1px solid var(--border); border-radius: 20px;
  padding: 36px 26px; display: flex; flex-direction: column; gap: 12px; align-items: center; box-shadow: 0 20px 60px rgba(0,0,0,.45); }
.card img { filter: drop-shadow(0 0 16px rgba(139, 92, 246, .6)); }
h1 { font-size: 22px; margin: 4px 0 10px; letter-spacing: .01em; }
input, button { width: 100%; font: inherit; padding: 12px 14px; border-radius: 12px; }
input { border: 1px solid var(--border); background: var(--bg); color: var(--text); }
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
button { border: 0; background: var(--accent); color: #fff; font-weight: 600; cursor: pointer; }
button:hover { background: #7c4ff0; }
.err { color: #f87171; min-height: 1.5em; margin: 0; font-size: 14px; }
.err:empty { display: none; }