:root {
  color-scheme: dark;
  --bg-1: #07111f;
  --bg-2: #102033;
  --card: rgba(10, 18, 31, 0.88);
  --line: rgba(255,255,255,0.09);
  --text: #f5f8ff;
  --muted: #94a3b8;
  --accent: #f59e0b;
  --danger: #ef4444;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, Arial, sans-serif;
  background: radial-gradient(circle at top, #17304f 0%, var(--bg-1) 42%, #030712 100%);
  color: var(--text);
}
.login-shell {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.login-card {
  width: min(100%, 420px);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: 0 28px 70px rgba(0,0,0,.45);
  padding: 28px;
}
.login-brand {
  display: inline-flex;
  min-width: 64px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(245,158,11,.12);
  color: #ffd68a;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
}
h1 { margin: 16px 0 8px; font-size: 30px; }
.login-subtitle, .login-note { color: var(--muted); }
.login-error {
  margin: 16px 0;
  padding: 12px 14px;
  border-radius: 12px;
  background: rgba(239,68,68,.12);
  border: 1px solid rgba(239,68,68,.25);
  color: #fecaca;
}
form { display: grid; gap: 14px; margin-top: 16px; }
label { display: grid; gap: 6px; font-size: 14px; }
input {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.04);
  color: var(--text);
  padding: 14px 15px;
}
button {
  border: 0;
  border-radius: 12px;
  padding: 14px 16px;
  background: linear-gradient(135deg, #f59e0b, #fb7185);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}

.judge-shell {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.judge-card {
  width: min(100%, 420px);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: 0 28px 70px rgba(0,0,0,.45);
  padding: 30px 26px;
  text-align: center;
}
.judge-spinner {
  width: 52px;
  height: 52px;
  margin: 0 auto 18px;
  border-radius: 999px;
  border: 4px solid rgba(255,255,255,.14);
  border-top-color: var(--accent);
  animation: runtime-spin 1s linear infinite;
}
.judge-copy {
  color: var(--muted);
}
@keyframes runtime-spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}