:root {
  --bg: #0f1117;
  --card: #171a22;
  --border: #232734;
  --text: #ffffff;
  --accent: #00ADFD;
}

h3 {
  font-size: 1em;
  opacity: 0.5;
  margin-top: 5px;
  margin-bottom: 10px;
}

h2 {
  margin-bottom: 0;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.container {
  padding: 80px 40px;
  max-width: 900px;
  margin: auto;
}

.cards {
  display: flex;
  gap: 30px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  padding: 30px;
  border-radius: 8px;
  width: 250px;
}

.btn {
  background: var(--accent);
  border: none;
  padding: 10px 18px;
  border-radius: 5px;
  color: white;
  cursor: pointer;
  margin-top: 20px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.75);
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-box {
  background: var(--card);
  padding: 30px;
  border-radius: 8px;
  width: 320px;
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.modal-box input {
  padding: 10px;
  border-radius: 5px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: white;
}

.error {
  color: #ff6b6b;
  font-size: 13px;
  min-height: 18px;
}