* {
  box-sizing: border-box;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  margin: 0;
  padding: 0;
}

body {
  background-color: #0b192c;
  color: #ffffff;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
}

.card {
  background: #1e293b;
  border: 1px solid #334155;
  padding: 30px;
  border-radius: 16px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
  width: 100%;
  max-width: 450px;
  text-align: center;
}

.card.wide {
  max-width: 650px;
}

.header-box .subtitle {
  color: #94a3b8;
  font-size: 14px;
  margin-bottom: 5px;
}

.header-box h1 {
  color: #f59e0b;
  font-size: 28px;
  margin-bottom: 10px;
}

.header-box p {
  color: #cbd5e1;
  font-size: 14px;
  line-height: 1.5;
}

.form-group {
  margin-bottom: 15px;
  text-align: right;
}

label {
  display: block;
  margin-bottom: 8px;
  color: #e2e8f0;
  font-size: 14px;
}

input {
  width: 100%;
  padding: 12px;
  background-color: #0f172a;
  border: 1px solid #334155;
  border-radius: 8px;
  color: #ffffff;
  font-size: 16px;
}

input:focus {
  outline: none;
  border-color: #f59e0b;
}

.btn {
  width: 100%;
  background-color: #f59e0b;
  color: #0f172a;
  border: none;
  padding: 14px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-block;
  text-decoration: none;
}

.btn:hover {
  background-color: #d97706;
}

.btn-secondary {
  background-color: #334155;
  color: #ffffff;
}

.btn-secondary:hover {
  background-color: #475569;
}

.btn-opt {
  background-color: #2563eb;
  color: #ffffff;
}

.btn-opt:hover {
  background-color: #1d4ed8;
}

.options-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.status-box {
  background: #0f172a;
  padding: 10px;
  border-radius: 8px;
  margin: 15px 0;
}

.highlight {
  color: #f59e0b;
  font-weight: bold;
}

.error-msg {
  color: #ef4444;
  margin-top: 10px;
  font-weight: bold;
}

.leaderboard {
  text-align: right;
  padding-right: 20px;
  margin-top: 15px;
}

.leaderboard li {
  margin-bottom: 8px;
  color: #cbd5e1;
}