* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: linear-gradient(135deg, #0f0c29, #302b63, #24243e);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.auth-container {
  width: 100%;
  max-width: 420px;
  padding: 1.5rem;
}

.auth-card {
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.logo {
  text-align: center;
  margin-bottom: 1.8rem;
}

.logo h1 {
  font-size: 1.8rem;
  color: #00ffcc;
  margin-bottom: 0.3rem;
}

.logo p {
  color: #aaa;
  font-size: 0.95rem;
}

/* Tabs */
.tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.8rem;
}

.tab {
  flex: 1;
  padding: 0.6rem;
  background: rgba(255, 255, 255, 0.06);
  border: none;
  color: #ccc;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: all 0.2s;
}

.tab.active {
  background: #00ffcc;
  color: #0f0c29;
  font-weight: 600;
}

.tab:hover:not(.active) {
  background: rgba(255, 255, 255, 0.12);
}

/* Forms */
.form {
  display: none;
}

.form.active {
  display: block;
}

.form-group {
  margin-bottom: 1.2rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.4rem;
  font-size: 0.9rem;
  color: #bbb;
}

.form-group input {
  width: 100%;
  padding: 0.75rem 1rem;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 8px;
  color: #fff;
  font-size: 1rem;
  outline: none;
  transition: border 0.2s;
}

.form-group input:focus {
  border-color: #00ffcc;
}

.btn {
  width: 100%;
  padding: 0.85rem;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s, opacity 0.15s;
}

.btn:active {
  transform: scale(0.98);
}

.btn.primary {
  background: #00ffcc;
  color: #0f0c29;
}

.btn.primary:hover {
  opacity: 0.9;
}

.btn.secondary {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  margin-bottom: 0.5rem;
}

.btn.secondary:hover {
  background: rgba(255, 255, 255, 0.18);
}

.message {
  margin-top: 1rem;
  font-size: 0.9rem;
  text-align: center;
  min-height: 1.2rem;
}

.message.error {
  color: #ff6b6b;
}

.message.success {
  color: #00ffcc;
}