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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, sans-serif;
  background: #0f0f1a;
  color: #e0e0e0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-image:
    radial-gradient(ellipse at 20% 50%, rgba(56, 100, 220, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 50%, rgba(140, 60, 220, 0.1) 0%, transparent 50%);
}

.login-container {
  width: 100%;
  max-width: 400px;
  padding: 20px;
}

.login-card {
  background: rgba(25, 25, 40, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  padding: 40px;
  backdrop-filter: blur(20px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.login-header {
  text-align: center;
  margin-bottom: 32px;
}

.login-header h1 {
  font-size: 28px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}

.login-header p {
  color: #888;
  font-size: 14px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: #aaa;
  margin-bottom: 6px;
}

.form-group input {
  width: 100%;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  color: #fff;
  font-size: 15px;
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
}

.form-group input:focus {
  border-color: rgba(80, 130, 255, 0.5);
  box-shadow: 0 0 0 3px rgba(80, 130, 255, 0.15);
}

.form-group input::placeholder {
  color: #555;
}

.error-message {
  background: rgba(220, 50, 50, 0.15);
  border: 1px solid rgba(220, 50, 50, 0.3);
  color: #ff6b6b;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 13px;
  margin-bottom: 20px;
}

button[type="submit"] {
  width: 100%;
  padding: 12px;
  background: linear-gradient(135deg, #4060dd, #6040cc);
  border: none;
  border-radius: 8px;
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.1s;
}

button[type="submit"]:hover {
  opacity: 0.9;
}

button[type="submit"]:active {
  transform: scale(0.98);
}

button[type="submit"]:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.otp-back-btn {
  display: block;
  margin-top: 10px;
  background: none;
  border: none;
  color: #888;
  font-size: 13px;
  cursor: pointer;
  text-decoration: underline;
  padding: 0;
}
.otp-back-btn:hover { color: #bbb; }

#otp {
  text-align: center;
  font-size: 24px;
  font-family: 'SF Mono', 'Menlo', 'Monaco', monospace;
  letter-spacing: 0.3em;
}

/* Prevent iOS overscroll */
body { overscroll-behavior: none; }

/* Mobile login */
@media (max-width: 480px) {
  body {
    padding: env(safe-area-inset-top, 0px) 0 env(safe-area-inset-bottom, 0px);
  }
  .login-container { padding: 16px; }
  .login-card {
    padding: 32px 20px;
    border-radius: 16px;
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.6);
  }
  .login-header h1 { font-size: 26px; }
  .login-header { margin-bottom: 28px; }
  .form-group input {
    padding: 14px 16px;
    font-size: 16px; /* 16px prevents iOS auto-zoom on focus */
    border-radius: 10px;
  }
  button[type="submit"] {
    padding: 15px;
    font-size: 16px;
    border-radius: 10px;
  }
  #otp { font-size: 24px; padding: 14px; }
  .otp-back-btn {
    margin-top: 14px;
    font-size: 15px;
    padding: 10px 0;
    text-align: center;
  }
  .error-message { font-size: 14px; padding: 12px 14px; }
}